Skocz do pozycji: 1.

Tytuł:

Flood risk zoning of Satluj River Basin, Himachal Pradesh, India

Autorzy:

Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/11273.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Opis:

Increasing intensity and frequency of rainfall coupled with gradual retreating of glaciers due to climate change in Himalayan region likely to increase the risk of floods. A better understanding of risk zones which are vulnerable to flood disasters can be evolved from the detailed studies on slope, geomorphology and land use/ land cover pattern. Information of these parameters is an important input for the identification of vulnerable areas. Flood risk maps provide useful information about places that may be at risk from flooding. It offers a cost-effective solution for planning, management and mitigation strategies in risky areas. Traditional methods of flood risk mapping are based on ground surveys and aerial observations, but when the phenomenon is widespread, such methods are time consuming and expensive. The possible combination of DEM and other maps of area using an overlay operation method within the Geographical Information System (GIS) platform can lead to derivation and the understanding of spatial association between various parameters which could be used to predict flood risk zones. The study area i.e. Satluj River Basin has been broadly divided into five risk zones viz., very low, low, moderate, high and very high which helped to differentiate between areas that are at risk of different intensities of flood. The very high flood risk zone covers only 3.25 % of total study area, while the very low risk zone covers 13.63 %. The area falls within the very high and high risk constitutes 9.52 % of total basin area. Domain of moderate risk covers an area of 30.66 %. But the maximum area of river basin is constituted by low risk zone i.e. 46.19 %. Identification of such zones will help in timely adopting of mitigation and adaptation measures. Preparation of flood risk zoning maps also helps in regulating indiscriminate and unplanned land use practices in risky areas.

Źródło:

International Letters of Natural Sciences; 2015, 40
2300-9675

Pojawia się w:

International Letters of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Trend analysis of flood peaks in lower reaches of Satluj River, Himachal Pradesh, India

Autorzy:

Kumar, S.
Santosh, ---

Powiązania:

https://bibliotekanauki.pl/articles/970628.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

flood peaks
mann-kendall test
satluj river basin
regression
trend analysis.

Opis:

Climate change arising from anthropogenic driven emissions of greenhouse gases has emerged as one of the most important environmental issues in the last two decades. One of the most significant potential consequences of climate change may be alteration in regional hydrological cycle and river flow regimes. Increased temperature is expected to increase the peak flows in snowfed rivers of Himalayas. The changing pattern of regional temperature on flood peaks deserves urgent and systematic attention over a basin which provides an insight view of historical trends. Lower reaches of Satluj River is selected for the present study. Testing the significance of observed trends in flood peaks has received a great attention recently, especially in connection with climate change. The data series available was 48 years (1967-2010). The records were subjected to trend analysis by using both non-parametric (Mann-Kendall test) and parametric (linear regression analysis) procedures. For better understanding of the observed trends, flood peaks were computed into standardised flood peak indices (SFPI). These standardised data series were plotted against time and the linear trends observed were represented graphically. The analysis of flood peaks at different observation stations in lower reaches of Satluj River showed a large variability in the trends and magnitudes. The trend analysis results of flood peaks and gauge heights indicate that the flood peaks at all sites i.e. Rampur, Suni and Kasol show increasing but statistically insignificant trends. The trends in gauge height at all sites are also showing increasing trend but Kasol is statistically significant at 95% confidence level. The fast melting of glaciers, incessant monsoon rainfall and the synchronisation of the discharge peaks are the main causes of river floods. The past flood peaks will help us to observe the frequency of occurrence of floods in certain region and to determine whether the flood peaks in the past have been same with that of the present or whether there is any deviation in the trend in relation to climate change. Such studies will help in designing mitigation and adaptation strategies towards extreme hydrological events.

Źródło:

International Letters of Natural Sciences; 2015, 46
2300-9675

Pojawia się w:

International Letters of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Microstructural considerations on SH-wave propagation in a piezoelectric layered structure

Autorzy:

Goyal, R.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/280348.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

SH-wave
piezoelectricity
couple stress
characteristic length

Opis:

Shear wave based acoustic devices are being used in gaseous and liquid environments because of their high-sensitivity. The theoretical study of horizontally polarized shear (SH) waves in a layered structure consisting of a piezoelectric ceramic of P ZT − 5H or BaT iO3 material overlying a couple stress substrate is presented in this paper. The considered substrate is supposed to be exhibiting microstructural properties. The closed form expression of dispersion relations are derived analytically for electrically open and short conditions. The effects of internal microstructures of the couple stress substrate, thickness of P ZT − 5H or BaT iO3 ceramic, piezoelectric and dielectric constants are illustrated graphically on the phase velocity of the piezoelectric layer under electrically open and short conditions.

Źródło:

Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 993-1004
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Controllability of semilinear systems with fixed delay in control

Autorzy:

Kumar, S.
Sukavanam, N.

Powiązania:

https://bibliotekanauki.pl/articles/952777.pdf

Data publikacji:

2015

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

first order delay system
mild solution
fixed point
exact controllability

Opis:

In this paper, different sufficient conditions for exact controllability of semilinear systems with a single constant point delay in control are established in infinite dimensional space. The existence and uniqueness of mild solution is also proved under suitable assumptions. In particular, local Lipschitz continuity of a nonlinear function is used. To illustrate the developed theory some examples are given.

Źródło:

Opuscula Mathematica; 2015, 35, 1; 71-83
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Application of UPFC for enhancement of voltage profile and minimization of losses using Fast Voltage Stability Index (FVSI)

Autorzy:

Kumar, S.
Renuga, P.

Powiązania:

https://bibliotekanauki.pl/articles/140514.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

flexible AC transmission system (FACTS)
real and reactive power
Unified Power Flow Controller (UPFC)
Bacterial Foraging (BF) algorithm

Opis:

Transmission line loss minimization in a power system is an important research issue and it can be achieved by means of reactive power compensation. The unscheduled increment of load in a power system has driven the system to experience stressed conditions. This phenomenon has also led to voltage profile depreciation below the acceptable secure limit. The significance and use of Flexible AC Transmission System (FACTS) devices and capacitor placement is in order to alleviate the voltage profile decay problem. The optimal value of compensating devices equires proper optimization technique, able to search the optimal solution with less computational burden. This paper presents a technique to provide simultaneous or individual controls of basic system parameter like transmission voltage, impedance and phase angle, thereby controlling the transmitted power using Unified Power Flow Controller (UPFC) based on Bacterial Foraging (BF) algorithm. Voltage stability level of the system is defined on the Fast Voltage Stability Index (FVSI) of the lines. The IEEE 14-bus system is used as the test system to demonstrate the applicability and efficiency of the proposed system. The test result showed that the ocation of UPFC improves the voltage profile and also minimize the real power loss.

Źródło:

Archives of Electrical Engineering; 2012, 61, 2; 239-250
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

A Comparison of Muscular Activity Involved in the Use of Two Different Types of Computer Mouse

Autorzy:

Kumar, R.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/90400.pdf

Data publikacji:

2008

Wydawca:

Centralny Instytut Ochrony Pracy

Tematy:

muscular activity
EMG
computer mouse

Opis:

Two types of computer input devices, a conventional mouse and a roller bar one, were studied in terms of muscular activitiy in m. trapezius dexter, m. deltoideus anterior dexter and m. extensor digitorum dexter, and comfort rating. Fifteen university students and employees participated in this study. The order of the devices was random. While a task was performed, electromyography (EMG) data were recorded for each test. Muscular activity was found to be significantly lower for the roller bar mouse than for the conventional one. Comfort rating indicated there was a significant difference in moving a cursor with the conventional mouse compared to the roller bar one. It is concluded that a roller bar mouse allowed the subjects to work closer to the body compared to the conventional one, thus the former can be recommended as a general means of reducing upper extremity musculoskeletal disorders.

Źródło:

International Journal of Occupational Safety and Ergonomics; 2008, 14, 3; 305-311
1080-3548

Pojawia się w:

International Journal of Occupational Safety and Ergonomics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Comparison of Ergonomic Risk Assessment Output in Four Sawmill Jobs

Autorzy:

Jones, T.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/90305.pdf

Data publikacji:

2010

Wydawca:

Centralny Instytut Ochrony Pracy

Tematy:

physical ergonomics
exposure assessment
musculoskeletal risk assessment
job analysis
prevention and control

Opis:

The objectives of this study were to examine the agreement between 5 ergonomic risk assessment methods calculated on the basis of quantitative exposure measures and to examine the ability of the methods to correctly classify 4 at risk jobs. Surface electromyography and electrogoniometry were used to record the physical exposures of 87 sawmill workers performing 4 repetitive jobs. Five ergonomic risk assessment tools (rapid upper limb assessment [RULA], rapid entire body assessment [REBA], American conference of governmental industrial hygienist’s threshold limit value for mono-task hand work [ACGIH TLV], strain index [SI], and concise exposure index [OCRA]) were calculated. Dichotomization of risk to no risk and at risk resulted in high agreement between methods. Percentage of perfect agreement between methods when 3 levels of risk were considered was moderate and varied by job. Of the methods examined, the RULA and SI were best (correct classification rates of 99 and 97% respectively). The quantitative ACGIH-TLV for mono-task hand work and Borg scale were worst (misclassification rates of 86 and 28% respectively).

Źródło:

International Journal of Occupational Safety and Ergonomics; 2010, 16, 1; 105-111
1080-3548

Pojawia się w:

International Journal of Occupational Safety and Ergonomics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Biomechanical Loads and Subjective Stress Exposure to Lumber Graders in Sawmill Industry

Autorzy:

Jones, T.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/90791.pdf

Data publikacji:

2011

Wydawca:

Centralny Instytut Ochrony Pracy

Tematy:

job analysis
lumber graders
wood product manufacturing
repetitive strain
upper extremity
physical and psychophysical stress

Opis:

The aim of this study was to determine biomechanical loads and subjective stresses on lumber graders and associated morbidity in a high risk and repetitive sawmill occupation. The exposures of all 29 male sawmill worker volunteers were recorded. Motion and posture were studied with electrogoniometers, muscle loads were recorded with surface electromyography, and psychophysical stresses were assessed with subjective responses. Fifty-nine percent of the participants reported greater than moderate discomfort in their taskdominant upper extremity. Job performance required an average range of motion of 44º, 21º, and 52º in flexion/extension, radial/ulnar deviations, and pronation/supination respectively. It also required an average of 9% maximum voluntary contraction force and was repeated an average of 34 times/min. This repetitive exertion over an 8-h shift was deemed to be a significant risk factor associated with prevalent upper extremity morbidity.

Źródło:

International Journal of Occupational Safety and Ergonomics; 2011, 17, 1; 87-97
1080-3548

Pojawia się w:

International Journal of Occupational Safety and Ergonomics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Dispersion of Rayleigh Waves in a Microstructural Couple Stress Substrate Loaded with Liquid Layer Under the Effects of Gravity

Autorzy:

Sharma, V.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/947783.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

couple stress theory
Rayleigh waves
gravity
characteristic length
liquid loading

Opis:

Bone loss is one of the serious health issues in bedridden patients or young generation due to lack of physical activities. Mechanical forces are exerted on the bones through ground reaction forces, liquid loadings and by other contraction activities of the muscles. We are assuming an isotropic half-space with mechanical properties equivalent to that of bone exhibiting microstructures. Consistent couple stress theory introduces an additional material parameter called characteristic length which accounts for inner microstructure of the material. Dispersion relations for leaky Rayleigh waves are derived by considering a model consisting of couple stress half space under the effects of gravity and loaded with inviscid liquid layer of finite thickness or a liquid half space. Impact of the gravity, liquid loadings and microstructures of the material are investigated on propagation of leaky Rayleigh type waves. Phase velocity of leaky Rayleigh waves is studied for five different values of characteristic length parameter which are of the order of internal cell size of the considered material. Variations in phase velocity of leaky Rayleigh waves are also studied under the effect of gravity parameter and thickness of liquid loadings.

Źródło:

Archives of Acoustics; 2018, 43, 1; 11-20
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Dispersion of SH waves in a viscoelastic layer imperfectly bonded with a couple stress substrate

Autorzy:

Sharma, V.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/949130.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

SH waves
couple stress theory
imperfect bonding
characteristic length
viscoelasticity

Opis:

The paper deals with propagation of SH waves in a viscoelastic layer over a couple stress substrate with imperfect bonding at the interface. A dispersion equation of SH waves in a viscoelastic layer overlying the couple stress substrate with an imperfect interface between them has been obtained. Dispersion equations for propagation of SH waves with perfectly bonded interface and slippage interface between two media are also obtained as particular cases. Effects of the degree of imperfectness of the interface are studied on the phase velocity of SH waves. The dispersion curves are plotted and the effects of material properties of both couple stress substrate and viscoelastic layer are studied. The effects of internal microstructures of the couple stress substrate in terms of characteristic length of the material are presented. The effects of heterogeneity, friction parameter and thickness of the viscoelastic layer are also studied on the propagation of SH waves.

Źródło:

Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 535-546
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Effects of liquid loadings on lamb waves in context of size dependent couple stress theory

Autorzy:

Sharma, V.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/949331.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

couple stress
characteristic length
Lamb waves
elastic waves
liquid loadings

Opis:

For understanding the effects of an internal microstructure, generalised microcontinuum theories with additional microstructural parameters are developed. One such a parameter, called the characteristic length of the material comparable with the internal cell size of the material is involved in the couple stress theory. The problem of propagation of Lamb waves in a plate with an internal microstructure and loaded with an inviscid liquid on both sides is studied using the couple stress theory. The dispersion equation of Lamb waves with the liquid loadings is derived. The impact of the liquid loadings is studied on the propagation of Lamb waves. The effect of the characteristic length is also studied on the phase velocity of Lamb waves in the plate for various modes in the presence of liquid loadings.

Źródło:

Journal of Theoretical and Applied Mechanics; 2015, 53, 4; 925-934
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Modelling and characterization of laser welded incoloy 800 HT joints

Autorzy:

Arun Kumar, S.
Paulraj, S.

Powiązania:

https://bibliotekanauki.pl/articles/102190.pdf

Data publikacji:

2016

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

incoloy 800 HT
laser welding
modeling and simulation
mechanical and metallurgical characteristics

Opis:

This study aims at finding the effect of laser welding speed on incoloy 800 HT. This alloy is one of the potential materials for Generation IV nuclear plants. Laser welding has several advantages over arc welding such as low fusion zone, low heat input and concentrated heat intensity. Three different welding speeds were chosen and CO2 laser welding was performed. 2D modeling and simulation were done using ANSYS 15 to find out the temperature distribution at different welding speeds and it was found that an increase in the welding speed decreased the temperature. Mechanical properties such as tensile strength, toughness and hardness were evaluated. The effect of welding speed on metallurgical characteristics was studied using optical microscopy (OM), Scanning Electron Microscopy (SEM) with EDS, X-Ray Diffraction (XRD) technique and fractographic analysis. From the results it was found that high welding speed (1400 mm/min) decreased the joint strength. The M23C6 and Ni3Ti carbides were formed in a discrete chain and in a globular form along the grain boundaries of the weld region which increased the strength of the grain boundaries. Fractographic evaluations of the tested specimens for welding speed (1000 and 1200) mm/min showed deep and wide dimples indicating ductile failures.

Źródło:

Advances in Science and Technology. Research Journal; 2016, 10, 30; 115-126
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Effects of Heat Input on the Mechanical and Metallurgical Characteristics of TIG Welded Incoloy 800HT Joints

Autorzy:

Arun Kumar, S.
Sathiya, P.

Powiązania:

https://bibliotekanauki.pl/articles/356231.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

incoloy 800 HT
corrosion
aging
sensitization
heat input

Opis:

This study focuses on the effect of heat input on the quality characteristics of tungsten inert arc gas welded incoloy 800HT joints using inconel-82 filler wire. Butt welding was done on specimens with four different heat inputs by varying the process parameters like welding current and speed. The result indicated that higher heat input levels has led to the formation of coarser grain structure, reduced mechanical properties and sensitization issues on the weldments. The formation of titanium nitrides provided resistance to fracture and increased the tensile strength of the joints at high temperatures. Further aging was done on the welded sample at a temperature of 750°C for 500 hours and the metallographic result showed formation of carbides along the grain boundaries in a chain of discrete and globular form which increased the hardness of the material. The formation of spinel NiCr₂ O₄ provided oxidation resistance to the material during elevated temperature service.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 3; 1673-1679
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

A Comparative Study on Ballistic Behaviour of MWCNT / Graphene Reinforced AL6061 Surface Composites Fabricated Via Friction Stir Processing

Autorzy:

Magarajan, U.
Suresh Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/27324483.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

ballistic behaviour
friction stir processing
graphene
Multi Walled Carbon Nano Tubes
depth of penetration

Opis:

In this work, a comparative study on the ballistic behaviour of friction stir processed AL6061 targets had been made. Base Metal AL6061 (BM) plates with 25 mm thickness were friction stir processed by adding Multi Walled Carbon Nano Tubes (MWCNT) and Graphene (G), producing AL6061-MWCNT and AL6061-G surface composites. Optical microscopy and microhardness test on BM, AL6061-MWCNT and AL6061-G samples were performed as per the standard procedure. It was noticed that uniform dispersion of ceramic particles and refined grains were obtained for the friction stir processed surface composites. From the microhardness test, it was perceived that friction stir processing had induced strengthening of surface composites, hence increasing the microhardness of AL6061-MWCNT and AL6061-G by ~60.3% and ~73.6% respectively. Also, ballistic experiments were conducted at 680±10 m/s by impacting Ø7.62×51 mm projectiles. AL6063 backing plates were placed to compare the ballistic behaviours AL6061-MWCNT and AL6061-G targets by depth of penetration. It was noted that the depth of penetration of AL6061-MWCNT and AL6061-G targets were 37.81% and 65.84% lesser than the BM target. Further, from the results of Post ballistic microscopy it was observed that the microstructure near and away from the penetration channel edge looks unchanged in BM target. However, the AL6061-MWCNT and AL6061-G targets showed considerable change in their morphology, by forming Adiabatic Shear Bands.

Źródło:

Archives of Metallurgy and Materials; 2023, 68, 2; 541--550
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Research on hybrid modified pathfinder algorithm for optimal reactive power dispatch

Autorzy:

Suresh, V.
Senthil Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/2086822.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

optimal reactive power dispatch
ORPD
real-power losses
pathfinder algorithm
PFA
modified pathfinder algorithm
mPFA
hybrid pathfinder algorithm
HPFA
optymalna dyspozycja mocy biernej
strata mocy rzeczywistej
algorytm wyszukiwania najkrótszej drogi
algorytm wyszukiwania najkrótszej drogi zmodyfikowany
algorytm wyszukiwania najkrótszej drogi hybrydowy

Opis:

Hybridization of meta-heuristic algorithms plays a major role in the optimization problem. In this paper, a new hybrid meta-heuristic algorithm called hybrid pathfinder algorithm (HPFA) is proposed to solve the optimal reactive power dispatch (ORPD) problem. The superiority of the Differential Evolution (DE) algorithm is the fast convergence speed, a mutation operator in the DE algorithm incorporates into the pathfinder algorithm (PFA). The main objective of this research is to minimize the real power losses and subject to equality and inequality constraints. The HPFA is used to find optimal control variables such as generator voltage magnitude, transformer tap settings and capacitor banks. The proposed HPFA is implemented through several simulation cases on the IEEE 118-bus system and IEEE 300-bus power system. Results show the superiority of the proposed algorithm with good quality of optimal solutions over existing optimization techniques, and hence confirm its potential to solve the ORPD problem.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137733, 1--8
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Reflection and transmission of plane waves between two different fluid saturated porous half spaces

Autorzy:

Kumar, R.
Miglani, A.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/202265.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

porous
amplitude ratios
reflection
transmission
longitudinal waves

Opis:

The present study is concerned with the reflection and transmission of plane waves between two different fluid saturated porous half spaces when longitudinal and transversal waves impinge obliquely at the interface. Amplitude ratios of various reflected and transmitted waves are obtained .The variations of amplitude ratios with angle of incidence are depicted graphically. A particular case of reflection at the free surface in fluid saturated porous half spaces has been deduced and discussed. A special case of interest has also been deduced from the present investigation.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 2; 227-234
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Fuzzy based trust management system for cloud environment

Autorzy:

Kumar, S.
Mittal, S.
Singh, M.

Powiązania:

https://bibliotekanauki.pl/articles/102848.pdf

Data publikacji:

2016

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

cloud computing
trust model
fuzzy logic
cloud analyst

Opis:

Cloud computing is a business model with high degree of flexibility, scalability in providing infrastructure, platform and software as a service over the internet. Cloud promises for easiness and reduced expense to service providers and consumers. However, a lack of trust between these two stakeholders has hindered the universal accep¬tance of cloud for outsourced services. In this paper, a fuzzy based trust management system is proposed to facilitate cloud consumers in identifying trustworthy providers. The performance of the proposed system is validated through a simulation using CloudAnalyst and Simulink.

Źródło:

Advances in Science and Technology. Research Journal; 2016, 10, 30; 32-37
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Geopolymerisation of Mechanically Activated Lignite and Brown Coal Fly Ash

Autorzy:

Mucsi, G.
Molnár, Z.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/1375557.pdf

Data publikacji:

2014-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.20.Wk

Opis:

Geopolymers have been synthesized from mechanically activated lignite and brown coal fly ash. Mechanical activation of fly ash has been carried out using laboratory ball mill. To determine the structural changes in both, the fly ash and the resulted geopolymer, Fourier transform infrared spectroscopy measurements were performed. Isothermal conduction calorimetry method was applied to study the geopolymerisation reactions in mechanically non-activated (raw) and activated fly ash samples. The isothermal conduction calorimetry results showed similar peak intensity for mechanically activated (5-30 min) fly ash samples. However, the intensity of peak for 120 min milled brown coal fly ash was the highest. The compressive strength of the specimen was found to be dependent on the grinding residence time as well as composition/type of fly ash.

Źródło:

Acta Physica Polonica A; 2014, 126, 4; 994-998
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

A Scheme for Template Security at Feature Fusion Level in Multimodal Biometric System

Autorzy:

Selwal, A.
Gupta, S. K.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/102518.pdf

Data publikacji:

2016

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

feature template
biometric data
feature vectors
multimodal biometrics
fuzzy sets
database
feature fusion

Opis:

Biometrics is the science of human recognition by means of their biological, chemical or behavioural traits. These systems are used in many real life applications simply from biometric based attendance system to providing security at a very sophisticated level. A biometric system deals with raw data captured using a sensor and feature template extracted from raw image. One of the challenges being faced by designers of these systems is to secure template data extracted from the biometric modalities of the user and protect the raw images. In order to minimize spoof attacks on biometric systems by unauthorised users one of the solutions is to use multi-biometric systems. Multi-modal biometric system works by using fusion technique to merge feature templates generated from different modalities of the human. In this work, a novel scheme is proposed to secure template during feature fusion level. The scheme is based on union operation of fuzzy relations of templates of modalities during fusion process of multimodal biometric systems. This approach serves dual purpose of feature fusion as well as transformation of templates into a single secured non invertible template. The proposed technique is irreversible, diverse and experimentally tested on a bimodal biometric system comprising of fingerprint and hand geometry. The given scheme results into significant improvement in the performance of the system with lower equal error rate and improvement in genuine acceptance rate.

Źródło:

Advances in Science and Technology. Research Journal; 2016, 10, 31; 23-30
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Variable gravity effects on thermal instability of nanofluid in anisotropic porous medium

Autorzy:

Chand, R.
Rana, G. C.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/265426.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

porowatość
liczba Rayleigha
zmienna grawitacja
nanofluid
anisotropic porous medium
Rayleigh number
variable gravity

Opis:

In this paper, we study the effects of variable gravity on thermal instability in a horizontal layer of a nanofluid in an anisotropic porous medium. Darcy model been used for the porous medium. Also, it incorporates the effect of Brownian motion along with thermophoresis. The normal mode technique is used to find the confinement between two free boundaries. The expression of the Rayleigh number has been derived, and the effects of variable gravity and anisotropic parameters on the Rayleigh number have been presented graphically.

Źródło:

International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 631-642
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Comparative study of GA & DE algorithm for the economic operation of a power system using FACTS devices

Autorzy:

Bhattacharyya, B.
Gupta, V. K.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/141459.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

FACTS devices
line power flow
FACTS devices & its optimal locations
genetic algorithm
differential evolution technique

Opis:

The problem of improving the voltage profile and reducing power loss in electrical networks must be solved in an optimal manner. This paper deals with comparative study of Genetic Algorithm (GA) and Differential Evolution (DE) based algorithm for the optimal allocation of multiple FACTS (Flexible AC Transmission System) devices in an interconnected power system for the economic operation as well as to enhance loadability of lines. Proper placement of FACTS devices like Static VAr Compensator (SVC), Thyristor Controlled Switched Capacitor (TCSC) and controlling reactive generations of the generators and transformer tap settings simultaneously improves the system performance greatly using the proposed approach. These GA & DE based methods are applied on standard IEEE 30 bus system. The system is reactively loaded starting from base to 200% of base load. FACTS devices are installed in the different locations of the power system and system performance is observed with and without FACTS devices. First, the locations, where the FACTS devices to be placed is determined by calculating active and reactive power flows in the lines. GA and DE based algorithm is then applied to find the amount of magnitudes of the FACTS devices. Finally the comparison between these two techniques for the placement of FACTS devices are presented.

Źródło:

Archives of Electrical Engineering; 2013, 62, 4; 541-552
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Test Methods and Instrumentation for Assessing Reaction to Fire Properties of Railway Rolling Stock
Metody badań i aparatura stosowana do oceny właściwości reakcji taboru kolejowego na ogień

Autorzy:

Gregory, S.
Grayson, S. J.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/215416.pdf

Data publikacji:

2013

Wydawca:

Instytut Kolejnictwa

Tematy:

railway
EN 45545-2
fire
linings
flooring
cables
seats
właściwości palno-dymowe materiałów
badania
aparatura badawcza
jednolite procedury badawcze

Opis:

This paper briefly reviews the current instruments used in assessing the fire performance of railway rolling stock and those to be used in new European regulatory tests. The latter are a result of major developments towards harmonizing Railway Vehicle fire performance testing and classifications, initially developed under European Public Procurement directives and latterly via the Technical Specification for Interoperability (TSI). In many senses the interoperability of railway vehicles between different EU countries makes harmonization a very desirable requirement. The test specifications to be utilized for this process are described in EN 45545. The formation of the European Union and the subsequent agreements that several products should be tested using harmonized testing methods throughout the EU make the EU market the developed world's biggest market for most constructed products. Each member state is currently able to continue to classify the products using the traditional (often national) methods alongside the new methods during a transition period.
Autor przekrojowo omawia rozwój metod badawczych przeznaczonych do badań właściwości palno-dymowych materiałów. Przedstawia przede wszystkim badania i aparaturę stosowaną w Wielkiej Brytanii, a także metody rozwinięte w projektach europejskich oraz testy uwzględnione w nowej normie europejskiej EN 45545:2013. Podkreśla korzystny wpływ ujednolicenia procedur badawczych i wymagań na rozwój europejskiego rynku kolejowego.

Źródło:

Problemy Kolejnictwa; 2013, 160; 35-50
0552-2145
2544-9451

Pojawia się w:

Problemy Kolejnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Comparative potential of different botanicals and synthetic insecticides and their economics against Leucinodes orbonalis in eggplant

Autorzy:

Kumar, S.D.
Masarrat, H.
Muntaha, Q.

Powiązania:

https://bibliotekanauki.pl/articles/66686.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Opis:

The field experiment was conducted to evaluate the potential of two botanicals viz; ozoneem and neem seed kernel extract (NSKE) and three chemical insecticides viz; imidacloprid, alphamathrin, chlorpyriphos 50% EC + cypermethrin 5% EC against Leucinodes orbonalis, during the years from 2008 to 2009. Botanicals were tested alone and in combination with cultural practices. On the basis of the pooled means, the results revealed that three sprays of chlorpyriphos + cypermethrin @ 0.01% active substance (a.s.) in 15 days intervals was found to be the most economical, resulting in minimum shoot (2.15%) and fruit (12.95%) infestation respectively, followed by alphamathrin @ 0.01% a.s. with a highest marketable yield of 87.77 q/ha. Maximum marketable yield was received from the treatment with alphamathrin, but due to high costs involved in the use of this chemical, it took second place. Three sprays of NSKE @ 5 ml/lt. recorded a maximum of shoot (3.91%) and fruit (24.49%) infestation, respectively. However, shoot and fruit infestation was brought down and marketable yield increased to some extent, when these treatments were combined with cultural methods. It is therefore, suggested that the combination of chlorpyriphos 50% EC + cypermethrin 5% EC, being the most effective and economically viable insecticide, can be utilized as a valuable chemical component in Integrated Pest Management to manage the L. orbonalis in eggplant crop.

Źródło:

Journal of Plant Protection Research; 2012, 52, 1
1427-4345

Pojawia się w:

Journal of Plant Protection Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Thermal convection of magneto compressible couple-stress fluid saturated in a porous medium with Hall current

Autorzy:

Mehta, C. B.
Singh, M.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/265186.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

pole magnetyczne
ściśliwość
porowatość
prądy Hall'a
couple stress fluids
horizontal magnetic field
compressibility
porous medium
Hall currents

Opis:

An investigation is made on the effect of Hall currents on thermal instability of a compressible couple-stress fluid in the presence of a horizontal magnetic field saturated in a porous medium. The analysis is carried out within the framework of the linear stability theory and normal mode technique. A dispersion relation governing the effects of viscoelasticity, Hall currents, compressibility, magnetic field and porous medium is derived. For the stationary convection a couple-stress fluid behaves like an ordinary Newtonian fluid due to the vanishing of the viscoelastic parameter. Compressibility, the magnetic filed and couple-stress parameter have stabilizing effects on the system whereas Hall currents and medium permeability have a destabilizing effect on the system, but in the absence of Hall current couple-stress has a destabilizing effect on the system. It has been observed that oscillatory modes are introduced due to the presence of viscoelasticity, magnetic field porous medium and Hall currents which were non-existent in their absence.

Źródło:

International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 83-93
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Parametric studies and simulation of PSA process for oxygen production from air

Autorzy:

Beeyani, A.
Singh, K.
Vyas, R.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/779567.pdf

Data publikacji:

2010

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

amplituda ciśnienia adsorpcji
model matematyczny
symulacja
produkcji tlenu
MATLAB
Zeolit5A
pressure swing adsorption
mathematical model
simulation
oxygen production
Zeolite 5A

Opis:

A numerical simulation and parametric studies for the separation of air using 5A zeolite for the production of oxygen are presented for a basic two bed pressure swing adsorption (PSA) process. The simulation is based on an in-house program 'PSASOL' developed in MATLABŽ. The transient process of PSA has been described by a set of partial differential equations, which were solved using a finite difference method. Simulation results have been validated with the experimental data from literature. Based on the simulation results, an optimal set of operational parameter values has been obtained for the PSA bed. The values of the optimal parameters, viz. adsorption pressure, cycle time, feed rate, and product rate have been found to be 2.5 atm, 150 s, 15 cm3/s, and 2.55 cm3/s, respectively. For the optimal conditions, purity of 95.45% and recovery of 77.3% have been achieved. It has also been found that a longer tubular unit with the length to diameter (L/D) ratio of 10.5 is advantageous. The estimated pressure drop across the bed has been found to be negligible. Power consumption and productivity have also been computed.

Źródło:

Polish Journal of Chemical Technology; 2010, 12, 2; 18-28
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Evidence of amorphous Ca-phosphate precipitate caused by bio mineralisation in 4-5th CE lime plasters of the previously submerged east coastal monument of Salvankuppam

Autorzy:

Singh, Manager R.
Kumar, S. Vinodh
Ganaraj, Kuntikana

Powiązania:

https://bibliotekanauki.pl/articles/2086560.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Mineralogiczne

Tematy:

Amorphous Ca-phosphate
16S rRNA
Bio-mineralization
calcite
lime plasters

Opis:

The lime plasters of the excavated monument of Salvankuppam, previously submerged and exposed by the Tsunami occurred in the Indian Ocean on 26th December 2004 was studied with different analytical techniques. The temple is dated 4-5th century CE. The XRF, XRD, FTIR, NMR, SEM-EDX analysis of the lime plasters evidenced particular occurrence of phosphatised bacterial remains in saline conditions. The formation of amorphous Ca-phosphate by bio mineralization was identified in the plasters by the analyses. The plasters are made of air-lime with coarse aggregates and seashells inclusion as confirmed by the thermal and chemical analysis. The microstructure and morphological investigations of mineralized microbial structures by SEM-EDX indicated the formation of amorphous Ca-phosphate. The unordered and fibrous spherulites have hardened and reduced porosity of the plaster by bio mineralization as observed through MIP analysis. The 16S rRNA sequencing has identified the Pseudomonas strains mainly responsible for the clustering of amorphous Ca-phosphate particles around the bacterial colony.

Źródło:

Mineralogia; 2021, 52, 1; 19--30
1899-8291
1899-8526

Pojawia się w:

Mineralogia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Estimation of acoustically induced refractive index perturbation in silicon and germanium slab for optical applications

Autorzy:

Sharma, G.
Kumar, S.
Kumar, D.
Singh, V.

Powiązania:

https://bibliotekanauki.pl/articles/173371.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

dispersion relation
Lamb wave mode in silicon and germanium
displacement field
refractive index modulation

Opis:

In-plane displacement field and refractive index variation for silicon and germanium in the presence of Lamb wave is estimated for optical applications. The required dispersion equation in a thin silicon and germanium plates is obtained using the method of potentials with boundary conditions involving the bulk and surface stress of the materials considered. The eigen-values thus obtained are used to compute the Lamb wave modes for the slab of silicon and germanium at same thickness. The fundamental anti-symmetric and symmetric plate modes and their overtones are observed due to confinement of acoustic energy within the slab thickness. In addition, the excited symmetric modes in silicon have longer wavelengths than those of germanium at a fixed frequency. Therefore, the refractive index modulation through the Lamb wave in silicon is always larger as compared to that of germanium. This refractive index modulation can be treated as periodic sinusoidal refractive index variation and may be considered as a tunable one-dimensional photonics crystal.

Źródło:

Optica Applicata; 2015, 45, 4; 491-500
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Study on fungi inhabiting indoor woods and their eco-friendly management

Autorzy:

Tapwal, A.
Kalyan, P.
Kumar, S.
Chandra, S.

Powiązania:

https://bibliotekanauki.pl/articles/11389.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Źródło:

International Letters of Natural Sciences; 2016, 59
2300-9675

Pojawia się w:

International Letters of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

An implementation of the fast Givens transformations on a MIMD computer

Autorzy:

Kowalik, J. S.
Kumar, S. P.
Kamgnia, E. R.

Powiązania:

https://bibliotekanauki.pl/articles/742091.pdf

Data publikacji:

1983

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Źródło:

Applicationes Mathematicae; 1983-1985, 18, 1; 97-105
1233-7234

Pojawia się w:

Applicationes Mathematicae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Enhancement of Solubility and Mass Transfer Coefficient of Benzoic Acid Through Hydrotropy

Autorzy:

Prakash, G.D.
Kumar, S.T.
Gandhi, N.N.

Powiązania:

https://bibliotekanauki.pl/articles/779266.pdf

Data publikacji:

2013

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

hydrotropy
solubilization
mass-transfer coefficient
benzoic acid

Opis:

The effect of hydrotropes such as sodium salicylate, sodium benzoate, and nicotinamide on the solubility and mass transfer coefficient of benzoic acid has been investigated. The solubility studies were carried out under a wide range of hydrotrope concentrations (0 to 3.0 mol/L) and different system temperatures (303K to 333K). It has been observed that the solubility and mass transfer coefficient of benzoic acid increases with an increase in hydrotrope concentration and also with system temperature. A Minimum Hydrotrope Concentration (MHC) was found essential to initiate a significant increase in the solubility and the mass transfer coefficient. The maximum enhancement factor (?s), which is the ratio of the solubility value in the presence and absence of a hydrotrope, has been determined for all sets of experimentations. The solubility of benzoic acid has been enhanced to 19.98 times in the presence of 2.5 mol/L concentration of sodium salicylate hydrotrope at 333K.The effectiveness of hydrotropes was measured in terms of Setschenow constant Ks and the highest value has been observed as 0.502 for sodium salicylate.

Źródło:

Polish Journal of Chemical Technology; 2013, 15, 1; 46-50
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

The effect of hydrotropes on the solubility and mass transfer coefficient of 2-nitrobenzoic acid

Autorzy:

Thenesh-Kumar, S.
Gnana-Prakash, D.
Nagendra-Gandhi, N.

Powiązania:

https://bibliotekanauki.pl/articles/779314.pdf

Data publikacji:

2009

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

hydrotrop
solubilizacja
współczynnik wymiany masy
separacja
hydrotropy
solubilization
mass transfer coefficient
separation

Opis:

A comprehensive investigation on the solubility and mass transfer coefficient enhancement of 2-nitrobenzoic acid through hydrotropy, has been undertaken. The solubility and mass transfer coefficient studies were carried out using hydrotropes such as sodium acetate, citric acid and nicotinamide under a wide range of hydrotrope concentrations (0 to 3.0 mol/L) and different system temperatures (303 to 333 K). It was found that the solubility and mass transfer coefficient of 2-nitrobenzoic acid increases with an increase in hydrotrope concentration and also with system temperature. All hydrotropes used in this work showed an enhancement in the solubility and mass transfer coefficient to different degrees. The maximum enhancement factor value has been determined for both the solubility and mass transfer coefficient. The effectiveness of hydrotropes was measured in terms of Setschnew constant Ks and reported for all the hydrotropes used in this study.

Źródło:

Polish Journal of Chemical Technology; 2009, 11, 2; 55-59
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Corrosion Inhibition of Mild Steel in Nitric Acid Media by some Schiff Bases Derived from Anisalidine

Autorzy:

Saxena, N.
Kumar, S.
Sharma, M. K.
Mathur, S. P.

Powiązania:

https://bibliotekanauki.pl/articles/779278.pdf

Data publikacji:

2013

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Schiff base
degradation
inhibitor and mild steel

Opis:

Corrosion inhibition performance of mild steel in nitric acid solution containing different concentration of anisalidine derivative Schiff bases viz. N- (4-nitro phenyl) p-anisalidine (SB1), N- (4-chloro phenyl) p-anisalidine (SB2), N- (4-phenyl) p-anisalidine (SB3), N- (4-methoxy phenyl) p-anisalidine (SB4), N- (4-hydroxy phenyl) p-anisalidine (SB5) has been investigated using mass loss, thermometric and potentiostate polarization technique. Inhibition efficiencies of Schiff bases have been evaluated at different acid strength. The inhibition efficiency was found larger than their parent amines. Inhibition efficiencies of synthesized Schiff bases increase with inhibitor concentration. Inhibition efficiency increases up to 98.32% with ansalidine derivative Schiff base.

Źródło:

Polish Journal of Chemical Technology; 2013, 15, 1; 61-67
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Phytochemical and pharmacological aspects of Nothapodytes nimmoniana. An overview
Profil fitochemiczny i farmakologiczny Nothapodytes nimmoniana. Przegląd

Autorzy:

Khan, N.
Tamboli, E.T.
Sharma, V.K.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/72676.pdf

Data publikacji:

2013

Wydawca:

Instytut Włókien Naturalnych i Roślin Zielarskich

Tematy:

phytochemistry
pharmacology
Nothapodytes nimmoniana
Icacinaceae
camptothecin
medicinal property
human disease
treatment

Opis:

Nothapodytes nimmoniana (J. Graham) (Icacinaceae), commonly known as Amruta is found in India particularly in Maharashtra, Goa, Kerala, Assam, Jammu and Kashmir as well as Tamilnadu areas. It is an important medicinal plant, the major source of a potent alkaloid, namely camptothecin, of a wide spectrum of pharmacological activities like anti-cancer, anti-HIV, antimalarial, antibacterial, anti-oxidant, anti-inflammatory, anti-fungal and also applied in the treatment of anaemia. Camptothecin is still not synthesized, therefore, its production entirely depends on natural sources. N. nimmoniana is one such plant which yields contain camptothecin in significantly high amount. The plant is gaining international recognition due to its diversified medicinal uses. It is subjected to excessive harvest. It has been categorized as a vulnerable and endangered plant. The present review encompasses the phytochemical, analytical, pharmacological, biotechnological, and other specific aspects of N. nimmoniana.
Nothapodytes nimmoniana (J. Graham) (Icacinaceae), powszechnie znana jako Amruta, rośnie w Indiach, szczególnie w prowincjach Maharashtra, Goa, Kerala, Assam, Dżammu i Kaszmir, a także na niektórych obszarach Tamilnadu. Jest jedną z ważnych roślin leczniczych, głównym źródłem silnego alkaloidu, kamptotecyny, mającej szerokie spektrum działania: przeciwnowotworowe, anty-HIV, antymalaryczne, antybakteryjne, przeciwutleniające, przeciwzapalne, przeciwgrzybicze. Znajduje również zastosowanie w leczeniu anemii. Jak dotąd kamptotecyna nie została zsyntetyzowana, dlatego jej produkcja całkowicie zależy od źródeł naturalnych. N. nimmoniana jest jedną z roślin zawierających duże ilości kamptotecyny. Zyskała ona międzynarodowe uznanie dzięki szerokiemu spektrum zastosowań, co powoduje zwiększenie jej eksploatacji. Z tego powodu została uznana za gatunek zagrożony. Poniższy przegląd obejmuje badania fitochemiczne, analityczne, farmakologiczne, biotechnologiczne i inne prowadzone nad gatunkiem N. nimmoniana.

Źródło:

Herba Polonica; 2013, 59, 1
0018-0599

Pojawia się w:

Herba Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Parameter Characterization in Processing of Silver - Aluminum Based Electrical Contact Materials

Autorzy:

Praveen Kumar, S.
Parameshwaran, R.
Ananthi, A.
Jenil Jaba Sam, J.

Powiązania:

https://bibliotekanauki.pl/articles/352711.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

electrical contactor
silver
aluminum
tin oxide
conduction

Opis:

An electrical contractor is one which plays significant role in day todays life in industries as well as in home appliances. In current scenario the materials for conducting purpose has an overwhelming research capability. Now a day the silver based electrical contact composite material have provided the potential applications in aerospace and automobile industries. Among silver based contact material the silver cadmium oxide and silver tin oxide plays a vital role in fabrication of electrical contactors. In this research an attempt has been made to study the influence of adding Aluminum with silver based electrical contact composite materials by two different processing routes namely stir-casting and powder metallurgy. Silver and aluminum matrix plays a virtual role in composite world owing to their highest conductivity. Optimum parameters were identified for attaining the maximum properties such as conductivity, hardness, density, and porosity of composition. By this better conducting property and mechanical property of the electrical contact can be improved by this system. Thus a screening test has be conducted with addition of Al with silver tin oxide compositions hence this paper aims to process the aluminum – silver based electrical contact materials by stir casting processing and powder metallurgy route and compare the results obtained.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 3; 1895-1901
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Study of Stannous-Cerium Oxide Nanocomposites as Nanofilm, Nanodot and Nanorod

Autorzy:

Budhiraja, N
Sharma, A.
Kumar, S.
Kaur, A.
Unikrishnan, N. V.

Powiązania:

https://bibliotekanauki.pl/articles/411664.pdf

Data publikacji:

2013

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

nanofilms
Nanowires
nanoparticles
Crystallography
Topography

Opis:

In the present paper, main emphasis is given to synthesize the Stannous-Cerium oxide nanocomposites in nanofilms, nanodots and nanorods by Chemical bath method, Chemical drop method and Chemical rolling Method. These nanocomposite materials are synthesized on a glass substrate at 100 °C temperature. Crystallography investigation of these materials is done by X-ray diffraction (XRD) which reveals that average grain size is 58.9 nm and 62.3 nm for nanofilms and nanodots on glass substrate respectively whereas XRD diffraction for nanorod on glass substrate reveals that material is amorphous in nature.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2013, 14; 69-79
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Transient finite element simulation and microstructure evolution of AA2219 weld joint using gas tungsten arc welding process

Autorzy:

Arunkumar, S.
Shrikrishna, A. K.
Paulraj, S.
Devakumaran, K.
Kumar, S. R.

Powiązania:

https://bibliotekanauki.pl/articles/101882.pdf

Data publikacji:

2016

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

AA2219 aluminium alloy
gas tungsten arc welding
finite element simulation
metallurgical characterization

Opis:

In this study we focus on finite element simulation of gas tungsten arc welding (GTAW) of AA2219 aluminum alloy and the behavioral of the microstructure before and after weld. The simulations were performed using commercial COMSOL Multiphysics software. The thermal history of the weld region was studied by initially developed mathematical model. A sweep type meshing was used and transient analysis was performed for one welding cycle. The highest temperature noted was 3568 °C during welding. The welding operation was performed on 200×100×25 mm plates. Through metallurgical characterization, it was observed that a fair copper rich cellular (CRC) network existed in the weld region. A small amount of intermetallic compounds like Al2Cu is observed through the XRD pattern.

Źródło:

Advances in Science and Technology. Research Journal; 2016, 10, 31; 64-73
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Meiotic studies in some members of Caryophyllaceae Juss. from the Western Himalayas

Autorzy:

Jeelani, S.M.
Rani, S.
Kumar, S.
Kumari, S.
Gupta, R.C.

Powiązania:

https://bibliotekanauki.pl/articles/19318.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Caryophyllaceae
Himalayas
meiotic process
chromosome number
meiosis
Western Himalayas
pollen grain size
Arenaria kashmirica
Silene conoidea
Silene edgeworthii
Silene moorcroftiana
Silene nepalensis
Stellaria media
Stellaria monosperma
Stellaria semivestita
Lychnis coronaria
Silene vulgaris
India
Gypsophilla ceratioides

Opis:

The paper reports meiotic studies on 50 populations comprising 12 species belonging to 5 genera of Caryophyllaceae from the Western Himalayas. The chromosome numbers in Arenaria kashmirica (n=20), Silene conoidea (n=20), S. edgeworthii (n=12 and n=24), S. moorcroftiana (n=24), S. nepalensis (n=12), Stellaria media (n=13), S. monosperma (n=13) and S. semivestita (n=13) are reported for the first time. The chromosome numbers in Lychnis coronaria (n=12) and Silene vulgaris (n=24) are given for the first time from India, along with Gypsophilla ceratioides (n=15) from the Western Himalayas. The course of meiosis varies from normal to abnormal in different populations of Silene conoidea, S. edgeworthii, S. vulgaris, Stellaria media, S. monosperma and S. semivestita. The course of meiosis was abnormal in all studied populations of Lychnis coronaria. Abnormal microsporogenesis (cytomixis, chromosomal stickiness, unoriented bivalents, formation of laggards and bridges) led to reduced pollen fertility and differences in pollen grain size.

Źródło:

Acta Biologica Cracoviensia. Series Botanica; 2011, 53, 1
0001-5296

Pojawia się w:

Acta Biologica Cracoviensia. Series Botanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Synthesis of $Fe_4[Fe(CN)_6]_3$·$14H_2O$ Nanopowder by Co-Precipitation Technique and Effect of Heat Treatment

Autorzy:

Rohilla, S.
Lal, B.
Sunder, S.
Aghamkar, P.
Kumar, S.
Aggarwal, A.

Powiązania:

https://bibliotekanauki.pl/articles/1535871.pdf

Data publikacji:

2010-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.07.-b
64.70.Nd
61.82.Rx

Opis:

Nanopowder of iron cyanide hydrate (member of Prussian blue family) was obtained using ferric chloride and potassium cyanide in their dilute solution through co-precipitation method. The effect of thermal annealing on iron cyanide hydrate nanocrystallites have been studied in detail. The formation of $Fe_4[Fe(CN)_6]_3$·$14H_2O$ and iron oxides was revealed by the Fourier transform infrared spectroscopy. The crystal structure, morphology and size of nanocrystallites were investigated by X-ray diffraction and transmission electron microscope. Results suggest that using co-precipitation technique, nanopowder of iron cyanide hydrate, in typically spherical shape, can be obtained and their thermal treatment also yield iron oxide nanocrystallites of spherical with good homogeneity. The size of the prepared nanocrystallites was found in the range 20-36 nm. It was observed that thermal treatment, typically at 800°C (4 h), iron cyanide hydrate ($Fe_4[Fe(CN)_6]_3$·$14H_2O$) nanocrystallites transformed into iron oxide ($α-Fe_2O_{3,}$ hematite) nanocrystallites.

Źródło:

Acta Physica Polonica A; 2010, 118, 4; 696-700
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Impact of Cutting Forces and Chip Microstructure in High Speed Machining of Carbon Fiber - Epoxy Composite Tube

Autorzy:

Allwin Roy, Y.
Gobivel, K.
Vijay Sekar, K. S.
Suresh Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/352953.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

composite materials
orthogonal machining
cutting forces
chip microstructure

Opis:

Carbon fiber reinforced polymeric (CFRP) composite materials are widely used in aerospace, automobile and biomedical industries due to their high strength to weight ratio, corrosion resistance and durability. High speed machining (HSM) of CFRP material is needed to study the impact of cutting parameters on cutting forces and chip microstructure which offer vital inputs to the machinability and deformation characteristics of the material. In this work, the orthogonal machining of CFRP was conducted by varying the cutting parameters such as cutting speed and feed rate at high cutting speed/feed rate ranges up to 346 m/min/ 0.446 mm/rev. The impact of the cutting parameters on cutting forces (principal cutting, feed and thrust forces) and chip microstructure were analyzed. A significant impact on thrust forces and chip segmentation pattern was seen at higher feed rates and low cutting speeds.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 3; 1771-1777
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Transformational green sustainable concepts in the field of infrastructure
Implementacja zielonych zrównoważonych rozwiązań w infrastrukturze

Autorzy:

Devarajan, P.
Kozarzewska, A.
Vijayan, D.S.
Kumar, S.
Sivasuriyan, A.
Sitek, W.

Powiązania:

https://bibliotekanauki.pl/articles/28765637.pdf

Data publikacji:

2024

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Źródło:

Acta Scientiarum Polonorum. Architectura; 2024, 23; 56-78
1644-0633

Pojawia się w:

Acta Scientiarum Polonorum. Architectura

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Ballistic studies of lightweight materials - a review

Autorzy:

Balaji, S.
Kumar, S. Dharani
Moorthy, K. Chandra
Javeed, M. Mohamed
Dharanidharan, D.

Powiązania:

https://bibliotekanauki.pl/articles/95205.pdf

Data publikacji:

2020

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

lightweight materials
ballistics
heat treatment
numerical studies
materiały lekkie
balistyka
obróbka cieplna
badania modelowe

Opis:

A recent development in the material studies provides beneficial application of lightweight alloys such as aluminium, magnesium as well as composites and metal matrices. The alloys are experimentally improved by increasing hardness in the ballistics testing using projectiles,makes them viable for the areas such as aerospace, military, defence, automobiles and so on. So the study is made on different approaches. First, by comparing different types of non-ferrous alloys and projectiles regarding sizes, structures. Second, the materials with heat treatment are also studied for investigating the hardness property by overcoming successful penetration on non-ferrous alloys. Third, material to be improvised by use of numerical studies such as 3D models, empirical models and software such as ANSYS, ABAQUS and AUTODYN, etc. Finally, the aim of this paper is to review the recent progress ballistic studies of lightweight materials and to provide a best choice of material for further on-going research.

Źródło:

Journal of Mechanical and Energy Engineering; 2020, 4, 1; 7-14
2544-0780
2544-1671

Pojawia się w:

Journal of Mechanical and Energy Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Xorshift random number generators from primitive polynomials

Autorzy:

Kumar Bishoi, S.
Narayan Maharana, S.

Powiązania:

https://bibliotekanauki.pl/articles/375858.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

random number generators
Xorshift generator
primitive polynomials
linear feed-back shift registers
multiple-recursive matrix method
generatory liczb losowych
generator Xorshift

Opis:

A class of Xorshift Random Number Generators (RNGs) are introduced by Marsaglia. We have proposed an algorithm which constructs a primitive Xorshift RNG from a given prim- itive polynomial. We also have shown a weakness present in those RNGs and suggested its solution. A separate algorithm also proposed which returns a full periodic Xorshift generator with desired number of Xorshift operations.

Źródło:

Theoretical and Applied Informatics; 2017, 29, 1-2; 1-13
1896-5334

Pojawia się w:

Theoretical and Applied Informatics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Design and Evaluation of the Thermal Properties of Di-, Tri- and Tetra-Azido-Esters

Autorzy:

Kumar, S.
Kumar, A.
Yamajala, K. D. B.
Gaur, P.
Kumar, D.
Banerjee, S.

Powiązania:

https://bibliotekanauki.pl/articles/358266.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

azido-esters
energetic plasticizers
DFT
contact angle

Opis:

A group of polycyclic and aliphatic azido-esters (as energetic plasticizers) have been synthesized by simple synthetic routes and their molecular structures were confirmed by spectroscopic techniques. In addition, their thermal and rheological properties have been determined utilizing DSC, TGA, viscosity, and contact angle. Computational studies of these plasticizers have been performed by means of DFT (B3LYP/6-31G*) to estimate possible stable structures, energies, heat of formation, bond dissociation energies, IR and NMR spectra etc. Their compatibility with glycidyl azide polymer (GAP) binder was studied to explore their applicability in propellants. All of these molecules are novel and have been synthesized with the possibility of scale up.

Źródło:

Central European Journal of Energetic Materials; 2017, 14, 4; 844-860
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Spatio-temporal variations in sulfur-oxidizing and sulfate-reducing bacterial activities during upwelling, off South-West coast of India

Autorzy:

Kamaleson, A.S.
Gonsalves, M.-J.
Kumar, S.
Jineesh, V.K.
LokaBharathi, P.A.

Powiązania:

https://bibliotekanauki.pl/articles/47551.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

spatio-temporal variability
sulphate reduction
sulphur oxidation
bacterial activity
microbial degradation
environment parameter
upwelling
Arabian Sea
India
coastal water

Źródło:

Oceanologia; 2019, 61, 4
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Particle-inflow-gun-mediated genetic transformation of buffel grass [Cenchrus ciliaris L.]: optimizing biological and physical parameters

Autorzy:

Bhat, V
Dalton, S.J.
Kumar, S.
Bhat, B.V.
Gupta, M.G.
Morris, P.

Powiązania:

https://bibliotekanauki.pl/articles/2048302.pdf

Data publikacji:

2001

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

buffel grass
promoter
genetic transformation
physical parameter
Cenchrus ciliaris
biological parameter
grass
biotechnology

Źródło:

Journal of Applied Genetics; 2001, 42, 4; 405-412
1234-1983

Pojawia się w:

Journal of Applied Genetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Development of advanced solar panel technologies in buildings – A review
Rozwój zaawansowanych technologii paneli fotowoltaicznych w budynkach – przegląd

Autorzy:

Kumar, S.
Vijayan, D.S.
Devarajan, P.
Sivasuriyan, A.
Koda, E.
Sitek, W.
Wodzyński, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/28765640.pdf

Data publikacji:

2024

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Źródło:

Acta Scientiarum Polonorum. Architectura; 2024, 23; 79-93
1644-0633

Pojawia się w:

Acta Scientiarum Polonorum. Architectura

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Photocatalytic degradation of ampicillin using silver nanoparticles biosynthesised by Pleurotus ostreatus

Autorzy:

Jassal, P.S.
Khajuria, R.
Sharma, R.
Debnath, P.
Verma, S.
Johnson, A.
Kumar, S.

Powiązania:

https://bibliotekanauki.pl/articles/2096973.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

ampicillin
FTIR
photocatalysis
silver nanoparticles (Ag-NPs)
TEM

Opis:

The past few decades have witnessed a tremendous increase in the consumption of antibiotics worldwide. This rampant and unregulated use of antibiotics and their improper disposal has led to the accumulation of these drugs in the environment. This in turn has led to the emergence of antibiotic resistance in microbes and has become one of the most pressing global concerns in medicine, with highly resistant pathogens of many species proving difficult to treat. The aim of the study was to synthesise silver nanoparticles (Ag-NPs) using white rot fungus, Pleurotus ostreatus and assess its potential to carry out photocatalytic degradation of ampicillin. UV–Vis spectroscopy, Fourier transform infrared spectroscopy and transmission electron microscope have been used to characterize biosynthesized Ag-NPs. The photocatalytic degradation of ampicillin in aqueous solution by Ag-NPs was evaluated under natural sunlight. The effect of the operating conditions (contact time, Ag-NP concentration and initial ampicillin concentration) on the photocatalytic degradation was also investigated. The highest ampicillin degradation of 96.5% was observed after exposure of the solution (antibiotic + nanoparticles) for 4 h in sunlight. The maximum degradation was observed at an Ag-NP concentration of 5 ppm at pH 6. To the best of our knowledge, photocatalytic degradation of ampicillin using Ag-NPs synthesised by P. ostreatus has not been reported earlier.

Źródło:

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2020, 101, 1; 5-14
0860-7796

Pojawia się w:

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

In vitro micropropagation of Acacia auriculiformis from selected juvenile sources

Autorzy:

Ismail, H.
Kumar, S.M.
Aziah, M.Y.
Hasnida, N.H.
Nor Aini, A.S.

Powiązania:

https://bibliotekanauki.pl/articles/41196.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Instytut Dendrologii PAN

Tematy:

in vitro
micropropagation
Acacia auriculiformis
juvenile source

Opis:

The effects of 6- Benzylaminopurine (BA), different basal medium, sucrose concentration and gelling agent were investigated for shoot induction and multiplication of Acacia auriculiformis. Nodal explants derived from 5-month-old seedlings yielded the highest shoot multiplication rate in Murashige and Skoog medium (MS) with 0.44 μM BA, 30 g/L sucrose and 2 g/L Gelrite. The highest mean number of shoots (10) and mean length of shoots (5.07mm) were also obtained in this medium. Qualitative observation of the shoots cultured in 0.44 μM BA were greener and vigorous in growth as compared to shoots cultured on higher concentrations of BA (22.2 μM). MS medium produced a significantly higher number of shoots (18) compared to Woody Plant Medium (WPM) (11) and B5 medium (10). Media solidified with different gelling agents also produced a significantly different number of shoots with 2 g/L Gelrite produced the highest number of shoots (23). The highest percentage of shoots rooted was found in the MS medium without any growth regulators (40.0%) followed by medium supplemented with Indole-3-butyric acid (IBA) at 9.84 μM and the combination of 9.84 μM IBA with 5.37 μM α-naphthalene acetic acid (NAA) (33.3%). MS medium without any plant growth regulators produced the highest mean root length (84.33mm), whereas medium supplemented with 9.84 μM IBA produced the highest mean number of roots per shoot (4.33). Out planting of in vitro rooted shoots in shredded coconut husk as the substrate gave the highest percentage of survival (90%) during acclimatization in the greenhouse.

Źródło:

Dendrobiology; 2016, 75
1641-1307

Pojawia się w:

Dendrobiology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

The Spin-Valve Transistor - a New Magnetoelectronic Device

Autorzy:

Anil Kumar, P. S.
Lodder, J. C.

Powiązania:

https://bibliotekanauki.pl/articles/2011222.pdf

Data publikacji:

2000-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

75.70.-i
75.70.Pa

Opis:

A spin-valve transistor showing high sensitivity at low fields was developed. A large magnetocurrent, above 500% is realized by a magnetic field change of 2 to 4 Oe at 80 K. Hot electrons are injected into the spin-valve layer through a Si-Pt Schottky diode. These hot electrons, while traversing through the spin-valve, are spin-dependently scattered. Those electrons with right energy and momentum are collected by a collector (an Au-Si Schottky diode) constituting a collector current. The relative orientation of the magnetic layer in the spin-valve is changed by the application of a magnetic field and causes a change in collector current giving a large magnetocurrent.

Źródło:

Acta Physica Polonica A; 2000, 97, 1; 111-118
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Chatter detection using principal component analysis in cold rolling mill

Autorzy:

Usmani, N. I.
Kumar, S.
Velisatti, S.
Tiwari, P. K.
Mishra, S. K.
Patnaik, U. S.

Powiązania:

https://bibliotekanauki.pl/articles/329460.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN

Tematy:

chatter
principal component analysis
PCA
cold rolling
vibration
drgania samowzbudne
analiza składowych głównych
walcowanie na zimno
drgania

Opis:

Most cold rolling mills are prone to chatter problem. Chatter marks are often observed on the strip surface in cold rolling mill leading to downgrade and rejection of rolled material. Chatter impact product quality as well as productivity of mill. In absence of online chatter detection no corrective action can be taken immediately and whole campaign gets affected. Most conventional approach for online chatter detection is by using vibration measurement of mill stands in time & frequency domain. Present work proposes two approaches to detect chatter in cold rolling mill using a statistical technique called Principal Component Analysis (PCA). In this paper two methods are used for chatter detection. First method applies PCA on Fast Fourier Transform (FFT) to differentiate between chatter and non-chatter condition. Second method applies PCA on statistical parameters calculated from raw vibration data to detect chatter.

Źródło:

Diagnostyka; 2018, 19, 1; 73-81
1641-6414
2449-5220

Pojawia się w:

Diagnostyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Tidal characteristics in the Gulf of Khambhat, Northern Arabian Sea — based on observation and global tidal model data

Autorzy:

Mitra, A.
Kumar, V.S.
Jena, B.K.

Powiązania:

https://bibliotekanauki.pl/articles/2079079.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

tidal model
sea level
wind
bathymetry
MIKE21 model
FES2014 model
Khambhat Gulf
Arabian Sea

Opis:

Tidal characteristics of the Gulf of Khambhat are described based on measured and modelled sea-level data. Data were recorded at three locations inside and two locations outside the Gulf with record lengths of 6–12 months to study the tidal propagation. A northward increase in tidal amplitude is noticed from Daman (eastern side) and Diu (western side) and attains maxima at Bhavnagar. A similar trend is followed by the amplitude of the major tidal constituents, although there are discrepancies for that of the minor constituents. The non-tidal factor which influences the sea-level is the local wind, especially the alongshore component of wind. A positive correlation is obtained between the sea-level and the meridional component of wind at each location. Harmonic analysis of sea-level data shows that M2 is the major tidal constituent which propagates in a non-linear fashion inside the Gulf. Tides from two global tide models (MIKE21 and FES2014) have been compared with the measured data, which could be used for further prediction of the tides and sediment transport in the Gulf. The tide elevation derived from the MIKE21 model has further been used for the harmonic analysis of tide. The tides predicted using one-month data are up to 10% smaller than those predicted using the one-year data. The global tide model FES2014 data performs well with measured data for offshore locations, whereas it fails to predict the same for the inner Gulf locations. The study manifests the fact that to understand the dynamics of complex tidal areas, regional models should better be used than global tidal models.

Źródło:

Oceanologia; 2020, 62, 4PA; 443-459
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Seasonal changes of sedimentation rates and sediment characteristics status in the Gulf of Mannar Coral Island, India

Autorzy:

Yogesh Kumar, J.S.
Geetha, S.
Sornaraj, R.

Powiązania:

https://bibliotekanauki.pl/articles/11860.pdf

Data publikacji:

2014

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

seasonal change
sedimentation rate
sediment status
Mannar Gulf
Coral Island
coral reef
marine sediment
Thoothukudi group
Vembar group
India

Opis:

Corals are known to flourish in various turbid environments around the world. The quantitative distinction between clear and turbid water in coral habitats is not well defined nor are the amount of sediment in suspension and rates of sedimentation used to evaluate the condition of reef environments well established. This study of sedimentation rate, sediment composition and pH, OC deposition was on a fringing reef flat off Thoothukudi and Vembar group of islands, Gulf of Mannar, India. In the present study the sedimentation rate ranged from 1.97 mg/cm2/day to 12.31 mg/cm2/day. The percentage of sand in the sediment was higher than silt and clay. The organic carbon level in all the study stations ranged from 0.03 to 2.54. The sediment pH of the six studied stations was highly acidic in nature at all the study sites in the Gulf of Mannar.

Źródło:

International Letters of Natural Sciences; 2014, 01
2300-9675

Pojawia się w:

International Letters of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Embedded Solitons and Conservation Law with $χ^{(2)}$ and $χ^{(3)}$ Nonlinear Susceptibilities

Autorzy:

Savescu, M.
Kara, A.
Kumar, S.
Krishnan, E.
Zaka Ullah, M.
Moshokoa, S.
Zhou, Qin
Biswas, A.

Powiązania:

https://bibliotekanauki.pl/articles/1398312.pdf

Data publikacji:

2017-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

solitons
χ^{(2)}
conservation laws

Opis:

This paper studies embedded solitons that are confined to continuous spectrum, with $χ^{(2)}$ and $χ^{(3)}$ nonlinear susceptibilities. Bright and singular soliton solutions are obtained by the method of undetermined coefficients. Subsequently, the Lie symmetry analysis and mapping method retrieves additional solutions to the model such as shock waves, singular solitons, cnoidal waves, and several others. Finally, a conservation law for this model is secured through the Lie symmetry analysis.

Źródło:

Acta Physica Polonica A; 2017, 131, 2; 297-303
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

Fabrication of a Novel Silver-Based Electrical Contact Composites and Assessment of Its Mechanical and Electrical Properties

Autorzy:

Kumar, Praveen S.
Senthil, S. M.
Parameshwaran, Rathinasamy
Rathanasamy, Rajasekar

Powiązania:

https://bibliotekanauki.pl/articles/2049131.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

silver tin oxide
electrical contact
composites
tungsten oxide
conductivity

Opis:

The electrical contactors play a crucial role in closing the circuit in many power distribution components like overhead lines, underground cables, circuit breakers, transformers, and control systems. The failure in these components mainly occurs due to the break-down of contactors due to the continuous opening and closing action of contacts. Silver (Ag)-based oxide contact materials are widely used in practice, among which silver tin oxide (AgSnO2) is most common. An attempt is made in increasing the performance of AgSnO2, by adding Tungsten Oxide (WO3) in various weight proportions, thus finding the optimal proportion of AgSnO2WO3 to have increased mechanical and electrical performances. All the composite samples are fabricated in-house using powder metallurgy process. The assessment of physical and electrical properties namely, density, hardness, porosity, and electrical conductivity, showed that 90%Ag-8.5%SnO2-1.5%WO3 composite yielded superior results. With help of morphological tests, wear characteristics are also investigated, which showed that 90%Ag-8.5%SnO2-1.5%WO2 composite has a wear coefficient of 0.000227 and a coefficient of friction of 0.174 at an optimized load of 10 N and sliding velocity of 0.5 mm/s.

Źródło:

Archives of Metallurgy and Materials; 2021, 66, 4; 1087-1094
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

AHP and TOPSIS based selection of aluminium alloy for automobile panels

Autorzy:

Swapna, D.
Srinivasa Rao, Ch.
Kumar, D. S.
Radhika, S.

Powiązania:

https://bibliotekanauki.pl/articles/95279.pdf

Data publikacji:

2019

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

material selection
MADM methods
AHP
TOPSIS
aluminium alloys
dobór materiałów
metody MADM
stopy aluminium

Opis:

Automotive industry is a very attractive area for young researchers to do continuous research and also it can be considered as an important thrust area as it is directly related to passenger safety. New developments in automotive sector can be seen in many domains like material selection, design, manufacturing etc. Since wrong selection directly leads to product failure, among these, the proper selection of a particular material can be treat as utmost priority. Hence, the present work discusses a methodology to select the best aluminium alloy for automobile panels among various alternates serving the same purpose. Analytical Hierarchy Process (AHP) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) methods with entropy weighting criteria are implemented for finding the best material and the results are discussed.

Źródło:

Journal of Mechanical and Energy Engineering; 2019, 3, 1; 43-50
2544-0780
2544-1671

Pojawia się w:

Journal of Mechanical and Energy Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Influence of Rock Properties on Wear of M and SR Grade Rubber with Varying Normal Load and Sliding Speed

Autorzy:

Pal, S. K.
Rao, K. U. M.
Kumar, P. S.
Rajasekar, R.

Powiązania:

https://bibliotekanauki.pl/articles/356996.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

rock
rubber
wear
shear strength
surface roughness

Opis:

Rubbers are interesting materials and are extensively used in many mining industries for material transportation. Wear of rubber is a very complex phenomenon to understand. The present study aims to explain the influence of rock properties on wear of M and SR grade rubber used in top cover of conveyor belts. Extensive laboratory experiments were conducted under four combinations of normal load and sliding speed. The wear of both the rubber types were analyzed based on the rock properties like shear strength, abrasivity index and fractal dimension. A fully instrumented testing set up was used to study the wear of rubber samples under different operating conditions. In general, wear was higher for M grade rubber compared to SR grade rubber. Increase in shear strength of rocks depicts decreasing trend for the wear of M and SR grade rubber at lower load conditions. Moreover, a higher load combination displays no definite trend in both the rubbers. The strong correlation between the wear of rubber and frictional power for all rubber-rock combinations has given rise to the parameter A, which reflects the relative compatibility between the rubber and rock. Increase of Cerchar’s Abrasivity Index of rocks shows gradual enhancement in wear for M grade rubber in all the load and speed combinations whereas, it fails in SR grade rubber due to its higher strength. The wear of rubber tends to decrease marginally with the surface roughness of rocks at highest normal load and sliding speed in M grade rubber. However, the wear of M and SR grade rubber is influenced by the surface roughness of rocks.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 3; 1787-1793
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Performance of operational satellite bio-optical algorithms in different water types in the Southeastern Arabian Sea

Autorzy:

Minu, P.
Lotliker, A.A.
Shaju, S.S.
Ashraf, P.M.
Kumar, T.S.
Meenakumari, B.

Powiązania:

https://bibliotekanauki.pl/articles/49018.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Źródło:

Oceanologia; 2016, 58, 4
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

Adsorption kinetic, equilibrium and thermodynamic investigations of Zn(II) and Ni(II) ions removal by poly(azomethinethioamide) resin with pendent chlorobenzylidine ring

Autorzy:

Kumar, P. S.
Ethiraj, H.
Venkat, A.
Deepika, N.
Nivedha, S.
Vidhyadevi, T.
Ravikumar, L.
Sivanesan, S.

Powiązania:

https://bibliotekanauki.pl/articles/780002.pdf

Data publikacji:

2015

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

adsorption
models
Ni(II) ions
poly(azomethinethioamide)
Zn(II) ions

Opis:

This paper reports the application of poly(azomethinethioamide) (PATA) resin having the pendent chlorobenzylidine ring for the removal of heavy metal ions such as Zn(II) and Ni(II) ions from the aqueous solutions by adsorption technology. Kinetic, equilibrium and thermodynamic models for Zn(II) and Ni(II) ions adsorption were applied by considering the effect of contact time, initial metal ion concentration and temperature data, respectively. The adsorption influencing parameters for the maximum removal of metal ions were optimized. Adsorption kinetic results followed the pseudo-second order kinetic model based on the correlation coefficient (R2) values and closed approach of experimental and calculated equilibrium adsorption capacity values. The removal mechanism of metal ions by PATA was explained with the Boyd kinetic model, Weber and Morris intraparticle diffusion model and Shrinking Core Model (SCM). Adsorption equilibrium results followed the Freundlich model based on the R2 values and error functions. The maximum monolayer adsorption capacity of PATA for Zn(II) and Ni(II) ions removal were found to be 105.4 mg/g and 97.3 mg/g, respectively. Thermodynamic study showed the adsorption process was feasible, spontaneous, and exothermic in nature.

Źródło:

Polish Journal of Chemical Technology; 2015, 17, 3; 100-109
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Passerine birds supporting cross pollination in Erythrina stricta Roxb.

Autorzy:

Khanduri, V.P.
Kumar, K.S.
Sharma, C.M.
Riyal, M.K.
Kar, K.
Singh, B.
Sukumaran, A.

Powiązania:

https://bibliotekanauki.pl/articles/2078260.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Instytut Dendrologii PAN

Tematy:

Ornithophily
pollination
mating system
geitonogamy
pollen grains

Opis:

Erythina stricta is an ecologically important tree species in the rainforests of India and its nectar within the flowers contributes to birds’ diet and survival. Reports on the pollination of this species have not been published so far. We therefore explore the reproductive system of this tree species which has great significance to its ecosystem. Birds have an important role in the reproduction of trees through pollination particularly in tropical areas where reproductive success mostly depends on animal pollinator interactions. Study of visitation and nectar feeding behaviour of birds alongwith breeding system assessment of Erythina stricta. Birds visiting and foraging behaviour was observed during Erythrina stricta flowering season in an indian tropical rainforest. Reproductive system was assessed through controlled pollination experiments. Thirteen bird species were recorded visiting and foraging nectar from the flowers of Erythrina stricta. The maximum numbers of visits recorded were from the Red-vented Bulbul (Pycnonotus cafer, Pycnonotidae). The nectar feeding birds were, either (i) potential pollinator with long bills (e.g. Pycnonotus spp., Chloropsis aurifrons, and Dicrurus spp.) or (ii) nectar robbers with comparatively shorter bills (e.g. Zosterops palpebrosa, Stachyris ruficeps, Macronous gularis, Heterophasia glaciris). Controlled pollination experiments revealed high degree of cross pollination (xenogamy) and self-incompatibility in E. stricta. Birds were more frequent in early mornings and their foraging activity was also observed during evening hours; the frequency however, declined with respect to nectar availability. Long corolla tubes of E. stricta could restrict access to nectar collecting bees

Źródło:

Dendrobiology; 2021, 85; 117-126
1641-1307

Pojawia się w:

Dendrobiology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Satellite estimates of the long-term trend in phytoplankton size classes in the coastal waters of North-Western Bay of Bengal

Autorzy:

Miranda, J.
Lotliker, A.A.
Baliareingh, S.K.
Jena, A.K.
Samanta, A.
Sahu, K.C.
Kumar, T.S.

Powiązania:

https://bibliotekanauki.pl/articles/2079007.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

phytoplankton
size class
coastal water
long-term variability
satellite data
statistical analysis
Bengal Bay

Opis:

The study presents long-term variability in satellite retrieved phytoplankton size classes (PSC) at two coastal sites, off Gopalpur and Visakhapatnam, in the north-western Bay of Bengal. The abundance-based models by Brewin et al. (2010) (B10) and Sahay et al. (2017) (S17), for retrieval of PSC (micro, nano, and picophytoplankton), from satellite data, were validated. Both the models performed well in the retrieval of nano and microphytoplankton. However, B10 performed poorly in retrieving picophytoplankton. The statistical analysis indicated better performance of the S17 model and hence was applied to Moderate Resolution Imaging Spectroradiometer onboard Aqua satellite (MODISA) data to understand the temporal (at monthly climatology) and spatial variability (from nearshore to offshore). The spatial distribution indicated nearshore dominance of micro and offshore dominance of picophytoplankton. In nearshore waters off Gopalpur, microphytoplankton dominated throughout the year except for months of south-west monsoon (June and July) where the dominance of picophytoplankton was observed. All PSC exhibited similar distribution at an annual scale with a primary peak during pre-monsoon (March and April) and a secondary peak during post-monsoon (September— November). However, microphytoplankton concentration during post-monsoon was higher off Gopalpur in comparison to Visakhapatnam. The higher microphytoplankton concentration during pre-monsoon was attributed to recurrent phytoplankton blooms. Whereas, post-monsoon increment could be attributed to enhanced phytoplankton growth by availing nutrients sourced from monsoonal precipitation induced terrigenous influx. The outcome of the present study recommends the use of the S17 model for satellite retrieval of PSC from the north-western Bay of Bengal.

Źródło:

Oceanologia; 2021, 63, 1; 40-50
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Chromophoric dissolved organic matter (CDOM) variability over the continental shelf of the Northern Bay of Bengal

Autorzy:

Das, S.
Das, I.
Giri, S.
Chanda, A.
Maity, S.
Lotliker, A.A.
Kumar, T.S.
Akhand, A.
Hazra, S.

Powiązania:

https://bibliotekanauki.pl/articles/48552.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

chromophoric dissolved organic matter
absorption coefficient
sea surface
salinity
chlorophyll a
total suspended matter
spatio-temporal variability
Bengal Bay
continental shelf

Opis:

The present paper dealt with the annual dynamics of the absorption coefficient of chromophoric dissolved organic matter at 440 nm {aCDOM(440)} during February 2015 to January 2016 in the continental shelf of northern Bay of Bengal (nBoB) for the first time. Sea surface salinity (SSS), chlorophyll-a (Chl-a), total suspended matter (TSM) were also analyzed. It was hypothesized that CDOM should exhibit significant spatial and temporal variability in this region. aCDOM(440) and spectral slope ranged between 0.1002 m1—0.6631 m1 and 0.0071 nm1— 0.0229 nm1 respectively during the entire study period. Higher values of aCDOM(440) were observed in the near shore stations and gradually decreased towards the offshore. Significant seasonal variability of aCDOM(440) was observed between the monsoon and non-monsoon seasons ( p < 0.05). Thus the framed hypothesis was successfully accepted by means of the present study. The CDOM was mainly found to be of allochthonous character in this region. aCDOM(440) portrayed a significant negative linear relationship with SSS (R2 = 0.80; p < 0.05) implying conservative mixing of marine and terrestrial end members. However, examining the spatial variability of the relationship, it was observed that this relationship was significant only in the nearshore stations. While examining the seasonal variability of this relationship, it was found to be most significant during the monsoon (R2 = 0.81; p < 0.05). Thus it was inferred that whenever the SSS gradient was higher, the relationship between aCDOM(440) and SSS was found to be most significant.

Źródło:

Oceanologia; 2017, 59, 3
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Characteristics, types and causes of chest pain in an urban family practice secondary care center in South India

Autorzy:

Kumar G.S., Yeshvanth
Rajkumar Honest, Prince Christopher
Subramanian, Apoorva
Abraham, Ranjit
Teja Velaga, Saran
Pricilla, Ruby Angeline
Kirubah Vasandhi, David
Sunil, Abraham

Powiązania:

https://bibliotekanauki.pl/articles/553099.pdf

Data publikacji:

2017

Wydawca:

Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych

Tematy:

chest pain
family practice
secondary care
India.

Źródło:

Family Medicine & Primary Care Review; 2017, 4; 377-381
1734-3402

Pojawia się w:

Family Medicine & Primary Care Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Synthesis and evaluation of novel mri contrast agents of chemically modified GD-DTPA complexes with sugars

Autorzy:

Sugiyama, M.
Yamashita, M.
Yu, G.
Fujie, M.
Ogawa, K.
Ozaki, N.
Aoki, T.
Mizuno, S.
Okada, S.
Tachi, K.
Aoshima, K.
Sankar, U. R.
Kumar, B. S.
Takehara, Y.
Sakahara, H.

Powiązania:

https://bibliotekanauki.pl/articles/385252.pdf

Data publikacji:

2009

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

MRI contrast agent
Gd(III)-DTPA
tumor imaging

Opis:

MRI is one of medical diagnostic imaging technologies that can draw the cross section in the body. To obtain a clearer image, Gd complexes are often used as MRI contrast agents. Gd-DTPA (Gd-Diethylenetriaminepentaacetate, Magnevist registered trademark ) is used in particular as the MRI contrast agents. We prepared and evaluated novel MRI contrast agents that were chemically modified Gd-DTPA with sugars (represented as Gd-DTPA-Sugar) via hydrolysis route for providing specificity to target organs and tissues. Gd-DTPASugar complex showed an excellent potential for the MRI contrast agent (r1=31.2 s-1mM-1). Gd-DTPA-Sugar complexes alternatively prepared by shorter synthetic route without protection/ deprotection (hydrolysis) method showed inferior results (r1=6.3 and 8.1 s-1mM-1) to the hydlized product.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 191-194
1897-8649
2080-2145

Pojawia się w:

Journal of Automation Mobile Robotics and Intelligent Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

A Quantitative Approach for the Determination of Light Induced Defects in $a-Se_{90}Sb_{10-x}Ag_x$ Thin Films by Using Thermally Stimulated Current Technique

Autorzy:

Kumar, Anjani
Tripathi, S.
Kumar, A.

Powiązania:

https://bibliotekanauki.pl/articles/1398969.pdf

Data publikacji:

2016-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

71.55.Jv
72.80.Ng

Opis:

Thin films of $Se_{90}Sb_{10-x}Ag_x$ (x=0, 2, 4, 6, 8) glasses have been prepared by vacuum evaporation technique. Present study reports the quantitative estimation of light induced defects in aforesaid thin films by using thermally stimulated current technique. Measurements have been made in a vacuum ≈10¯³ Torr before and after exposing amorphous films to white light for different exposure times (0 to 6 h). Results indicate that light induced defects are created due to prolonged exposure of light and this is explained by a microscopic model proposed by Shimakawa and co-workers. It is also found that fractional increase in light induced defect density decreases as Ag concentration increases. A discontinuity has, however, been observed at 4 at.% of Ag which is explained in terms of average coordination number.

Źródło:

Acta Physica Polonica A; 2016, 129, 6; 1178-1183
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Eigenvalue approach to nanobeam in modified couple stress thermoelastic with three-phase-lag model induced by ramp type heating

Autorzy:

Kumar, R.
Devi, S.

Powiązania:

https://bibliotekanauki.pl/articles/279203.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

modified couple stress thermoelastic
eigenvalue approach
nanobeam

Opis:

This article deals with the study of a thermoelastic nanobeam in a modified couple stress theory subjected to ramp-type heating. The mathematical model is prepared for the nanobeam in thermoelastic three-phase-lag. The Laplace transform and the eigenvalue approach are used to find the displacement component, lateral deflection, temperature change and axial stress of the thermoelastic beam. The general algorithm of the inverse Laplace transform is developed to compute results numerically. The comparison of three-phase-lag, dual-phaselag and GN-III (1993) models are represented, and their illustration is depicted graphically. This study finds the applications in engineering, medical science, sensors, etc.

Źródło:

Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 1067-1079
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Optimizing Space Complexity using Color Spaces in CBIR Systems for Medical Diagnosis

Autorzy:

Kenny, S. Pradeep Kumar

Powiązania:

https://bibliotekanauki.pl/articles/1031845.pdf

Data publikacji:

2020

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Cervical Cancer
Color Space
Content Based Image retrieval
Data Mining

Opis:

Content based Image Retrieval systems are now used in various automated systems because they largely produce accurate results as they do not depend on the metadata for telling what the image is but rather define it on the basis contents of the image like color, shape, texture and spatial locations. Content based Image retrieval systems have a repository of similar images and when a query image is presented to system it matches similar images in the database. This process aids in various applications like security checks to medical diagnosis. But all CBIR systems in common have to store the images which take a huge space. Here in this work, a unique approach is being devised to reduce the space complexity for a CBIR system used for detecting cervical cancer. When it comes to medical image it is not the question of how to reduce space, but along with it, the original contents of the image also has to be preserved.

Źródło:

World News of Natural Sciences; 2020, 30, 2; 96-103
2543-5426

Pojawia się w:

World News of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Metoda Mehar do analizy rozmytej niezawodności systemu produkcji tłoków
Mehars method for analyzing the fuzzy reliability of piston manufacturing system

Autorzy:

Lata, S.
Kumar, A.

Powiązania:

https://bibliotekanauki.pl/articles/301325.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

rozmyte równania różniczkowe
rozmyta niezawodność
trapezoidalna liczba rozmyta
fuzzy differential equations
fuzzy reliability
trapezoidal fuzzy number

Opis:

Wedle naszej najlepszej wiedzy, do tej pory stworzono jedynie dwie metody analityczne precyzyjnego rozwiązywania rozmytych równań różniczkowych. W artykule wskazano wady jednej z istniejących metod oraz zaproponowano nową metodę rozwiązywania równań różniczkowych, nazwaną metodą Mehar, w której wady te zostały wyeliminowane. Aby wykazać przewagę metody Mehar nad istniejącą metodą, rozwiązano za pomocą obu tych metod rozmyte równania różniczkowe Kołmogorowa wyprowadzone przy użyciu rozmytego markowowskiego modelu systemu produkcji tłoków. Wykazano, że wyniki otrzymane z wykorzystaniem istniejącej metody, mogą ale nie muszą być liczbami rozmytymi, natomiast wyniki otrzymane przy pomocy metody Mehar zawsze stanowią liczbę rozmytą.
To the best of our knowledge till now there are only two analytical methods for finding the exact solution of fuzzy differential equations. In this paper, the shortcoming of one of these existing methods is pointed out. To overcome the shortcoming of the existing method, a new method, named as Mehar's method, is proposed for solving fuzzy differential equations. To show the advantage of Mehar's method over existing method the fuzzy Kolmogorov's differential equations, developed by using fuzzy Markov model of piston manufacturing system, are solved by using the existing and Mehar's method and it is shown that the results, obtained by using the existing method, may or may not be fuzzy number while the results, obtained by using Mehar's method, are always fuzzy number.

Źródło:

Eksploatacja i Niezawodność; 2011, 3; 26-39
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Synthesis and Characterization of Al-Zn-Mg alloy / Zircon Sand Reinforced Composites

Autorzy:

Satish Kumar, T.
Shalini, S.
Krishna Kumar, K.

Powiązania:

https://bibliotekanauki.pl/articles/351684.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Al-Zn-Mg alloy
microstructure
hardness
tensile strength
wear

Opis:

Aluminium based metal matrix composite (Al-MMC’s) are much popular in the field like automobile and aerospace industries, because of its ease of fabrication process and excellent mechanical properties. In this study, Al-Zn-Mg alloy composite reinforced with 3, 6 and 9 v % of zircon sand was synthesised by stir casting technique. The microstructure of the composites revealed uniform distribution of reinforced particles. Hardness, tensile strength and wear resistance of Al-Zn-Mg alloy/zircon sand composite were found to increase with increase in v % percentage of zircon sand. Scanning Electron Microscope analysis of wear tested sample surface of composites revealed no evidence of plastic deformation of matrix phase. Particle pulls out and abrasive wear was the common feature observed from all the composites.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 2; 689-695
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Effect of SiO2 flux on the depth of penetration, microstructure, texture and mechanical behavior of AA6063 T6 aluminum alloy using activated TIG welding

Autorzy:

Kumar, Rajiv
Vettivel, S. C.
Kumar Kansal, Harmesh

Powiązania:

https://bibliotekanauki.pl/articles/2090702.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

aluminum alloy
depth of penetration
tensile strength texture
stop aluminium
głębokość penetracji
wytrzymałość na rozciąganie

Opis:

Activated tungsten inert gas (ATIG) welding has a good depth of penetration (DOP) as compared to the conventional tungsten inert gas (TIG) welding. This paper is mainly focused on ATIG characterization and mechanical behavior of aluminum alloy (AA) 6063-T6 using SiO2 flux. The characterization of the base material (BM), fusion zone (FZ), heat affected zone (HAZ) and, partially melted zone is carried out using the suitable characterization methods. The weld quality is characterized using ultrasonic-assisted non-destructive evaluation. A-scan result confirms that the ATIG welded samples have more DOP and less bead width as compared to conventional TIG. The recorded tensile strength of ATIG with SiO2 is better than the conventional TIG welding. The failure mode is ductile for ATIG welding with larger fracture edges and is brittle in the case of conventional TIG welding.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136215, 1--8
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Effect of SiO2 flux on the depth of penetration, microstructure, texture and mechanical behavior of AA6063 T6 aluminum alloy using activated TIG welding

Autorzy:

Kumar, Rajiv
Vettivel, S. C.
Kumar Kansal, Harmesh

Powiązania:

https://bibliotekanauki.pl/articles/2173585.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

aluminum alloy
depth of penetration
tensile strength texture
stop aluminium
głębokość penetracji
wytrzymałość na rozciąganie

Opis:

Activated tungsten inert gas (ATIG) welding has a good depth of penetration (DOP) as compared to the conventional tungsten inert gas (TIG) welding. This paper is mainly focused on ATIG characterization and mechanical behavior of aluminum alloy (AA) 6063-T6 using SiO2 flux. The characterization of the base material (BM), fusion zone (FZ), heat affected zone (HAZ) and, partially melted zone is carried out using the suitable characterization methods. The weld quality is characterized using ultrasonic-assisted non-destructive evaluation. A-scan result confirms that the ATIG welded samples have more DOP and less bead width as compared to conventional TIG. The recorded tensile strength of ATIG with SiO2 is better than the conventional TIG welding. The failure mode is ductile for ATIG welding with larger fracture edges and is brittle in the case of conventional TIG welding.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136215
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Latent semantic indexing using eigenvalue analysis for efficient information retrieval

Autorzy:

Aswani Kumar, Ch.
Srinivas, S.

Powiązania:

https://bibliotekanauki.pl/articles/908375.pdf

Data publikacji:

2006

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

wyszukiwanie informacji
indeksowanie semantyczne
wartość własna
wektor przestrzenny
information retrieval
latent semantic indexing
eigenvalues
rank reduction
singular value decomdecomposition
vector space method

Opis:

Text retrieval using Latent Semantic Indexing (LSI) with truncated Singular Value Decomposition (SVD) has been intensively studied in recent years. However, the expensive complexity involved in computing truncated SVD constitutes a major drawback of the LSI method. In this paper, we demonstrate how matrix rank approximation can influence the effectiveness of information retrieval systems. Besides, we present an implementation of the LSI method based on an eigenvalue analysis for rank approximation without computing truncated SVD, along with its computational details. Significant improvements in computational time while maintaining retrieval accuracy are observed over the tested document collections.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2006, 16, 4; 551-558
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

Health benefits of black tea

Autorzy:

Kumar, D.
Rizvi, S.I.

Powiązania:

https://bibliotekanauki.pl/articles/1916581.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet Medyczny w Białymstoku

Tematy:

Black tea
health
oxidative stress
polyphenols

Opis:

Tea is the most common beverage in the world. It is consumed mostly as green tea, oolong, or black tea. Depending on the manufacturing process, different varieties of tea can be produced. As tea is one of the most popular beverages, it could be a tremendously important source of polyphenolic constituents. Tea leaves are a source of polyphenols, especially catechins, which are known for their antioxidative activity. Various studies suggest that polyphenolic compounds present in black tea are associated with beneficial effects in prevention of cardiovascular diseases. In addition, anti-aging, antidiabetic and many other health beneficial effects associated with tea consumption have been reported. The review highlights the potential of black tea, its health benefits in terms of antioxidative, antimutagenic and anticarcinogenic properties as well as protective agents against cardiovascular diseases.

Źródło:

Progress in Health Sciences; 2014, 4, 2; 135-143
2083-1617

Pojawia się w:

Progress in Health Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

Oscillator Strengths of the 1s2s$\text{}^{1}$S$\text{}^{e}$ → 1s2p$\text{}^{1}$P$\text{}^{0}$ Transition in He

Autorzy:

Tiwary, S. N.
Kumar, P.

Powiązania:

https://bibliotekanauki.pl/articles/1887915.pdf

Data publikacji:

1991-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

31.10.+z

Opis:

The paper presents configuration interaction (CI) calculations of both the length and velocity forms of the oscillator strengths for 1s2s$\text{}^{1}$S$\text{}^{e}$ → 1s2p$\text{}^{1}$P$\text{}^{0}$ transition in the He atom. For the first time the agreement between the length and velocity values to within about 0.045% has been achieved.

Źródło:

Acta Physica Polonica A; 1991, 80, 1; 23-28
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

Withania somnifera acts as a potential insect growth regulator in the polyphagous pest, Pericallia ricini

Autorzy:

Gaur, S.K.
Kumar, K.

Powiązania:

https://bibliotekanauki.pl/articles/65183.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Withania somnifera
Solanaceae
seed extract
root extract
insect growth regulator
polyphagous pest
Pericallia ricini
Lepidoptera
larva

Opis:

Both seed and root extracts of the medicinal plant, Ashwagandha, Withania somnifera exhibit insect growth regulatory activity against the polyphagous pest, Pericallia ricini. Topical administration of W. somnifera seed and root extracts to last instar larvae of P. ricini disrupted moulting and metamorphosis, leading to a number of developmental abnormalities such as delay in larval-pupal and pupal-adult ecdysis, formation of larval-pupal, pupal- -adult and larval-pupal-adult mosaics/chimeras, ecdysial failure, suppression of pupation and adult emergence and formation of abnormal pupae and adultoids. The treatment with seed extracts was more severe than that of root extracts as it completely suppressed the pupation and adult emergence. The results clearly suggest that the medicinal plant, W. somnifera acts as a potential insect growth regulatory (IGR) disrupting the moulting and metamorphosis as a consequence of interference with the endocrine system.

Źródło:

Journal of Plant Protection Research; 2017, 57, 4
1427-4345

Pojawia się w:

Journal of Plant Protection Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Supply chain management practices and operational performance of fair price shops in India : an empirical study
Praktyka zarządzania łańcuchem dostaw i działania operacyjne sklepów z fair price w Indiach : studium przypadku

Autorzy:

Kumar, A.
Kushwaha, G. S.

Powiązania:

https://bibliotekanauki.pl/articles/362212.pdf

Data publikacji:

2018

Wydawca:

Wyższa Szkoła Logistyki

Tematy:

supply chain management
fair price shops
PLS
structure modelling
distribution system
zarządzanie łańcuchem dostaw
sklepy typu fair price
modelowanie struktury
system dystrybucji

Opis:

Background: In the current business environment, competition is no longer between the organisations but it is among the supply chains of the organisations. India's public distribution system is one of the biggest systems for food supply and distribution carried out through fair price shop (FPS). There is a wide gap concerning the empirical study on the fair price shops (FPS) and this is the rationale of the study. The paper aims to determine the relationship between different supply chain management practices and operational performance of the fair price shops in India. The authors propose the theoretical framework and empirically test the model. The study aims to expand the knowledge structure of supply chain management field. Methods: The paper opted for an exploratory cum descriptive study. The authors randomly selected 200 Fair price shops from a list available on the government website and identified the key persons from each shop as the respondent to get our questionnaire filled. The data were collected using structured questionnaire. Total 200 questionnaires were given to MBA students to collect the data from those fair price shops dealers who qualify the screening questions and situated in Bhopal Madhya Pradesh (India) in the month of March - April' 2017. Finally, 87 useful questionnaires were obtained, with a response rate of 43.5%, Authors employed the PLS-structural equation modelling (SEM) to test the theoretical model and hypothesis. Results: The study provides that three dimensions of SCM practices have a significant and positive relationship with the operational performance. The paper provides empirical insights about how change is brought about operational performance of the fair price shops. It suggests that supply chain management practices positively & significantly associated with the performance of fair price shops. Conclusion: This paper emphasizes the importance of supply chain management practices on the day to day operations of the fair price shops and provides an insight that these practices if employed properly they will give an added advantage. The study fulfils an identified need to study how supply chain management practices can impact the performance of fair price shops and the study directly measures the impact of supply chain management practices on operational performance of the fair price shops in India. The biggest limitation of this study is the size of the sample. Thus the research results may not be generalized. Therefore, researchers are encouraged to test the proposed framework at a broader level.
Wstęp: W obecnie istniejącym środowisku biznesowym, należy mówić raczej o rywalizacji nie między poszczególnymi organizacjami a sieciami organizacji. Indyjski publiczny system dystrybucji jest jednym z największych systemów dostaw i dystrybucji żywności realizowany poprzez sieć sklepów tzw. fair price (FPS). Pomimo tego faktu stosunkowo mało jest badań naukowych dotyczących tego typu sieci. Celem pracy jest określenie zależności pomiędzy różnymi metodami zarządzania łańcuchem dostaw i działaniami operacyjnymi tego typu sklepów w Indiach. Autorzy zaproponowali model teoretyczny oraz test empiryczny. Celem pracy jest poszerzenie wiedzy strukturalnej na temat zarządzania łańcuchem dostaw. Metody: Została wybrana próba losowa 200 sklepów typu fair price z listy dostępnej na stronie rządowej. Następnie zidentyfikowano osobę kluczową z każdego sklepu, jako ankietera uczestniczącego w badaniu. Dane zostały zebrane poprzez specjalnie stworzony kwestionariusz. Wywiady zostały przeprowadzone przez studentów MBA z wybranymi uprzednio osobami. Były one zbierane w Bhopal Madhya Pradesh w okresie marzec-kwiecień 2017. W rezultacie otrzymano 87 kompletnych kwestionariuszy (współczynnik udziału 43,5%). Model SEM strukturalnego równania PLS został użyty do testowania modelu teoretycznego i hipotez. Wyniki: Badania wykazały, że trzy wymiary metod zarządzania łańcuchem dostaw mają istotną i pozytywną zależność z działalnością operacyjną. Pokazały empirycznie jak zmiany wpływają na działalność operacyjną sklepów fair price. Wskazują, ze metody zarządzania łańcuchem dostaw pozytywnie i istotnie związane są z działalnością sklepów typu fair price. Wnioski: Praca wskazuje na istotny wpływ metod zarządzania łańcuchem dostaw na bieżąca działalność sklepów typu fair price oraz dowodzi pozytywny wpływ tych praktyk prawidłowo wdrożonych na uzyskanie wartości dodanej. Przeprowadzone badania uzupełniają lukę w badaniach nad wpływem metod zarządzania łańcuchem dostaw na działalność sklepów typu fair price w Indiach. Największym ograniczeniem tego badania była próba, na podstawie której uzyskano wyniki. W związku z tym nie jest możliwe uogólnienie tych wyników. Badania tego typu należałoby kontynuować w szerszym zakresie.

Źródło:

LogForum; 2018, 14, 1; 85-99
1734-459X

Pojawia się w:

LogForum

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Modified model for shear stress distribution using TRI-1 lunar soil simulant

Autorzy:

Jayalekshmi, S.
Gireesh Kumar, P.

Powiązania:

https://bibliotekanauki.pl/articles/949124.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

TRI-1
lunar soil simulant
modified model
shear stress distribution

Opis:

In the present study, research is carried out on deriving modified analytical equations for finding shear stress distribution and known as Modified Shear Stress models (SSM) beneath plain wheels (small and large) on TRI-1 lunar soil simulant. In all four models, the Reece model, Bekker model, Wong-Reece model and Iagnemma model, normal stress and shear stress are determined, and the shear stress determination is based on the Janosi and Hanamoto (1961) model. There exists ample scope for modifying this model. A modified model for shear stress distribution is developed and the same is discussed in this paper.

Źródło:

Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 137-146
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Analytical study of stress distribution models for estimation of stresses beneath plain rigid wheels and a vertical force on TRI-1 lunar soil simulant

Autorzy:

Kumar, Pala Gireesh
Jayalekshmi, S.

Powiązania:

https://bibliotekanauki.pl/articles/949136.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

TRI-1 lunar soil simulant
stress distributions
entry and exit angels
vertical force
DNSR and DSSR

Opis:

In this paper, three stress distribution models are considered, namely: Reece from 1965, Bekker from 1969, Wong-Reece from 1967. Two types of wheels are considered for the preset study, i.e., a small wheel with diameter of 160 mm and width 32 mm, whereas for a large wheel with diameter of 210 mm and width of 50 mm. TRI-1 or Tiruchirappalli soil simulant is considered for the interaction studies, which is an anorthosite based lunar soil simulant. The normal stress, shear stress and vertical forces are determined when the wheel starts moving on TRI-1 soil simulant. Entry and exit angles are also calculated for all models to estimate vertical forces. The maximum normal stress found for the small wheel was 32.121 kN/m2 (Wong-Reece model). In the case of the large wheel, the maximum normal stress was found to be 39.016 kN/m2 (Reece model). Vertical forces are found from the obtained normal stresses and shear stresses, and are presented graphically. The dimensionless stress ratio of both the wheels for the considered models, i.e., DNSR and DSSR, is also found.

Źródło:

Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 791-802
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Parametric Optimization for Producing Semi-Solid A383 Alloy using Cooling Slope Casting Process

Autorzy:

Rao, M. S.
Khandelwal, Himandshu
Kumar, M.
Kumar, A.

Powiązania:

https://bibliotekanauki.pl/articles/27314114.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

alloy A383
semi-solid alloys
casting process
cooling
hardness
non-dendritic microstructur
stop A383
stopy półstałe
proces odlewania
chłodzenie
twardość
mikrostruktura

Opis:

Cooling slope casting is a simple technique to produce semi-solid feedstock with a non-dendritic structure. The cooling slope technique depends on various parameters like slope length, slope angle, pouring temperature etc, that has been investigated in the present study. This work presents an extensive study to comprehend the combined effect of slope angle, slope length, pouring temperature, on hardness and microstructure of A383 alloy. Response Surface Methodology was adopted for design of experiments with varying process parameters i.e. slope angle between 15o to 60o, slope length between 400 to 700 mm, and pouring temperature between 560 oC to 600 oC. The response factor hardness was analysed using ANOVA to understand the effect of input parameters and their interactions. The hardness was found to be increasing with increased slope length and pouring temperature; and decreased with slope angle. The empirical relation for response with parameters were established using the regression analysis and are incorporated in an optimization model. The optimum hardness with non-dendritic structure of A383 alloy was obtained at 27o slope angle, 596.5 mm slope length and 596 oC pouring temperature. The results were successfully verified by confirmation experiment, which shows around 2% deviation from the predicted hardness (87.11 BHN).

Źródło:

Archives of Foundry Engineering; 2023, 23, 1; 43--52
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Unsteady three-dimensional MHD nanofluid flow over a stretching sheet with variable wall thickness and slip effects

Autorzy:

Kumar, G. Vinod
Varma, S. V. K.
Kumar, R. V. M. S. S. K.

Powiązania:

https://bibliotekanauki.pl/articles/265665.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

pole magnetyczne
magnetohydrodynamika
poślizg
unsteady flow
magnetic field
Buongiorno’s model
variable wall thickness sheet
velocity
thermal and solutal slip

Opis:

The stretching sheets with variable thickness may occur in engineering applications more frequently than a flat sheet. Due to its various applications, in the present analysis we considered a three dimensional unsteady MHD nanofluid flow over a stretching sheet with a variable wall thickness in a porous medium. The effects of radiation, viscous dissipation and slip boundary conditions are considered. Buongiorno’s model is incorporated to study the combined effects of thermophoresis and Brownian motion. The dimensionless governing equations are solved by using MATLAB bvp4c package. The impact of various important flow parameters is presented and analysed through graphs and tables. It is interesting to note that all the three boundary layer thicknesses are diminished by slip parameters. Further, the unsteady parameter decreases the hydromagnetic boundary layer thickness.

Źródło:

International Journal of Applied Mechanics and Engineering; 2019, 24, 3; 709-724
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

Inventory models with multiple production and remanufacturing batches under shortages

Autorzy:

Singh, S. R.
Sharma, S.
Kumar, M.

Powiązania:

https://bibliotekanauki.pl/articles/206729.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

inventory models
production
remanufacturing
shortages

Opis:

Owing to the ecological requirements and regulations, an enormous concern is being paid to the product re-processing. In the established literature, researchers considered that the remanufactured items are as good as the new ones. Yet, such an assumption is not convenient, as in many real situations the recycled products are considered by the customers to be of secondary quality. Further, the classical studies mainly addressed the inventory models without shortages, and this is not applicable in many practical business situations. This paper extends the reverse logistics inventory models with finite production and remanufacturing rate along with the assumption that newly produced and repaired (remanufactured) objects are not of same characteristics. Shortages are allowed and numerous stock-out cases are discussed. The collected used items are remanufactured (repaired) and non-repaired products are disposed off. The proposed models are illustrated with some numerical examples and their results are discussed.

Źródło:

Control and Cybernetics; 2016, 45, 3; 385-416
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

Methanogens in the environment: an insight of methane yield and impact on global climate change

Autorzy:

Kumar Pandey, A.
Das, N.
Muthu Kumar, A.
Rao, S.

Powiązania:

https://bibliotekanauki.pl/articles/11130.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Opis:

Methane is a most important greenhouse gas for planetary heating and it’s produced by methanogenic microorganisms as a metabolic byproduct and creates climate change. Methanogens are ancient organisms on earth found in anaerobic environments and methane is a key greenhouse gas concerned with methanogens. Therefore here is intense interest to writing this paper. A number of experiments have already conducted to study the methanogens in various environments such as rumen and intestinal system of animals, fresh water and marine sediments, swamps and marshes, hot springs, sludge digesters, and within anaerobic protozoa which utilize carbon dioxide in the presence of hydrogen and produce methane. The diversity of methanogens, belong to the domain Archaea and get involved in biological production of methane that catalyzes the degradation of organic compound as a part of global carbon cycle called methanogenesis. Majorly in this article we summaries the diversity of methanogens and their impact on global warming.

Źródło:

International Letters of Natural Sciences; 2015, 37
2300-9675

Pojawia się w:

International Letters of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Susceptor-Assisted Rapid Microwave Sintering of Al-Kaolin Composite in a Single-Mode Cavity

Autorzy:

Venkatesh, V.S.S.
Kumar, Sunil
Patnaik, Lokeswar

Powiązania:

https://bibliotekanauki.pl/articles/28099523.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

kaolin reinforcement
microwave sintering
mechanical properties
powder metallurgy

Opis:

The present research addresses the low-temperature sintering of 4% kaolin clay reinforced aluminium composite using susceptor-aided microwave sintering at 2.45 GHz frequency. Kaoline clay the naturally available mineral in the north-eastern regions of india. The study aims to convert this kaoline clay into the value added product with enhanced mechanical properties. The Al-x% Kaolin (x = 2, 4, 6, 8, 10) composite was fabricated through the powder metallurgy process by the application of 600 MPa compaction pressure. The composite corresponding to optimum ultimate tensile strength (U.T.S) was subjected to single-mode cavity microwave-assisted sintering by varying the sintering temperatures as 500°C, 550°C and 600°C. The effect of incorporating kaolin clay on the dielectric characteristics of composite powders, as well as the effect of sintering temperature on the microstructural changes and mechanical characteristics of Al-4%Kaolin composites were also examined. Results concluded that the addition of 4 wt% kaolin powder improves the dielectric characteristics of the composite powder. The maximum Hardness. Compression strength and U.T.S of 97 Hv, 202 MPa and 152 MPa respectively achieved for the Al-4% Kaolin composite sintered at 550°C. The higher fracture toughness of 9.56 Ma. m1/2 reveals the ductile fracture for the composite sintered at 550°C.

Źródło:

Archives of Metallurgy and Materials; 2023, 68, 2; 799--806
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Synthesis and Characterization of Functionally Graded Al-6Cr-Y2O3 Composites

Autorzy:

Satish Kumar, T.
Krishna Kumar, K.
Shalini, S.
Subramanian, R.

Powiązania:

https://bibliotekanauki.pl/articles/353460.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Al-6Cr alloy
powder metallurgy
functionally graded materials
wear resistance

Opis:

The present investigation aims at fabricating a functionally graded Al-6Cr-Y₂O₃ composite and its microstructural and property characterization. Al-6Cr-alloys with varying percentage of Y₂O₃ (5-10 vol. %) have been used to fabricate FGM by powder metallurgy route. The samples were subsequently subjected to solution treatment at 610°C for 4h followed by artificially aged at 310°C for 4h. The microstructure, hardness and wear behavior of these FGM have been evaluated. FGM exhibited superior hardness (360 ± 5 VHN) as compared to the unprocessed composites (220 ± 5 VHN) due to the uniform dispersion of Y₂O₃ particles. Wear resistance of Al-6Cr-10Y₂O₃ FGM were compared that of with pure Al-6Cr alloy by dry abrasive wear test. Al-6Cr-10Y₂O₃ FGM composites were found to exhibit higher wear resistance with the minimum wear rate of 0.009 mm³/m compared to the Al-6Cr alloy wear rate 0.02 mm³/m.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 4; 1649-1655
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

Technical Notes : Practical Concerns Associated with Single-Number Ratings in Measuring Sound Transmission Loss Properties of Partition Panels

Autorzy:

Garg, N.
Kumar, A.
Maji, S.

Powiązania:

https://bibliotekanauki.pl/articles/177637.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Sound Transmission Loss
Sound Transmission Class
spectrum adaptation terms
ISO 717-1
weighted sound reduction index
spectrum adaptation term corresponding to noise source
Cx
TL
STC

Opis:

The paper presents an extensive review investigating the practical aspects related to the use of single- number ratings used in describing the sound insulation performance of partition wall panels and practical complications encountered in precise measurements in extensive frequency range from 50 Hz to 5 kHz. SWOT analysis of various single number ratings is described. A laboratory investigation on a double wall partition panel combination revealed the significant dependence of STC rating on transmission loss at 125 Hz attributed to 8 dB rule. An investigation conducted on devising alternative spectrums of aircraft noise, traffic noise, vehicular horn noise and elevated metro train noise as an extension to ISO 717-1 Ctr for ascertaining the sound insulation properties of materials exclusively towards these noise sources revealed that the single-number rating Rw + Ctr calculated using ISO 717-1 Ctr gives the minimum sound insulation, when compared with Rw + Cx calculated using the alternative spectrums of aircraft noise, traffic noise, etc., which means that material provides a higher sound insulation to the other noise sources. It is also observed that spectrum adaptation term Cx calculated using the spectrum of noise sources having high sound pressure levels in lower frequencies decreases as compared to ISO 717-1 Ctr owing to significant dependence of Ctr at lower frequencies.

Źródło:

Archives of Acoustics; 2013, 38, 1; 115-124
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

Parametric Sensitivity Analysis of Factors Affecting Sound Transmission Loss of Multi-Layered Building Elements Using Taguchi Method

Autorzy:

Garg, N.
Kumar, A.
Maji, S.

Powiązania:

https://bibliotekanauki.pl/articles/178151.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

spectrum adaptation terms
weighted sound reduction index
orthogonal array
OA
analysis of variance
ANOVA
mass-air-mass resonance

Opis:

The paper presents application of Taguchi method in optimizing the sound transmission loss through sandwich gypsum constructions and those comprising of masonry concrete blocks and gypsum boards in order to investigate the relative influence of the various parameters affecting the sound transmission loss. The application of Taguchi method for optimizing sound transmission loss has been rarely reported. The present work uses the results analytically predicted on “Insul” software for various sandwich material configurations as desired by each experimental run in an L8 orthogonal array. The relative importance of the parameters on single-number rating, R_w (C, C_tr) is evaluated in terms of percentage contribu- tion using Analysis of Variance (ANOVA). The ANOVA method reveals that type of studs, steel stud frame and number of gypsum layers attached are the key factors controlling the sound transmission loss characteristics of sandwich multi-layered constructions.

Źródło:

Archives of Acoustics; 2014, 39, 2; 165-176
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Modeling cognitive functionalities of prosthetic arm using conceptual spaces

Autorzy:

Ishwarya, M.S.
Aswani Kumar, Ch.

Powiązania:

https://bibliotekanauki.pl/articles/384415.pdf

Data publikacji:

2019

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

cognition
conceptual spaces
concepts
information granules
prosthetic arm

Opis:

Conceptual space framework is used for representing knowledge in cognitive systems. In this paper, we have adapted conceptual space framework for prosthetic arm considering its cognitive abilities such as receiving signals, recognizing and decoding the signal and responding with the corresponding action in order to develop a conceptual space of the prosthetic arm. Cognitive functionalities such as learning, memorizing and distinguishing configurations of prosthetic arm are achieved via its conceptual space. To our knowledge, this work is the first attempt to adapt the conceptual spaces to model cognitive functionalities of prosthetic arm. Adding to this, we have made use of different notion of concept that reflects the topological structure in concepts. To model the actions of the prosthetic arm functionalities, we have made use of force patterns to represent action. Similarly, to model the distinguishing ability, we make use of the relationship between the attributes conveyed by adapted different notion of concept.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2019, 13, 4; 11-21
1897-8649
2080-2145

Pojawia się w:

Journal of Automation Mobile Robotics and Intelligent Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 87.

Tytuł:

Linear stability analysis for ferromagnetic fluids in the presence of magnetic field, compressibility, internal heat source and rotation through a porous medium

Autorzy:

Kumar, K.
Singh, V.
Sharma, S.

Powiązania:

https://bibliotekanauki.pl/articles/279562.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

ferrofluids
rotation
magnetic field
porous medium
heat source
compressibility

Opis:

The effects of magnetic field and heat source strength on thermal convection of a compressible rotating ferromagnetic fluid through a porous medium are investigated theoretically using linear stability theory. A normal mode analysis method is employed to find solutions for the fluid layer confined between parallel planes with free boundaries. The cases of stationary and oscillatory instabilities are discussed. For the stationary state, compressibility, medium porosity and temperature gradient due to heat source have destabilizing effects, whereas rotation and ratio of magnetic permeability delay the onset of convection. The magnetic field and medium permeability have both stabilizing and destabilizing effects under certain conditions. The variations in the stationary critical thermal Rayleigh number and neutral instability curves in (Ra1, x)-plane for various values of physical parameters are shown graphically to depict the stability characteristics. The sufficient conditions for the non-existence of overstability are obtained and the principle of exchange of stabilities holds true in the absence of magnetic field and rotation under certain conditions.

Źródło:

Journal of Theoretical and Applied Mechanics; 2015, 53, 4; 1067-1081
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 88.

Tytuł:

Identification of CD4plus T cell epitopes from Staphylococcus aureus secretome using immunoinformatic prediction and molecular docking

Autorzy:

Francis, D.
Kumar, A.
Chittalakkottu, S.

Powiązania:

https://bibliotekanauki.pl/articles/2096359.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

CD4+
T cell
epitope prediction
secretory proteins
Staphylococcus aureus
peptide vaccine
molecular docking

Opis:

One major reason for the lack of clinical success of Staphylococcus aureus vaccine candidates is the inability of the antigens to develop a CD4+ T cell-mediated immune response. Hence, it is important to identify CD4+ T cell antigens from S. aureus. CD4+ T cells are activated following the presentation of epitopes derived from exogenous proteins on HLA class II molecules. Fifty-nine secretory proteins of S. aureus were analyzed computationally for the presence of HLA class II binding peptides. Fifteen-mer peptides were generated, and their binding to 26 HLA class II alleles was predicted. The structural feasibility of the peptides binding to HLA-II was studied using molecular docking. Of the 16,724 peptides generated, 6991 (41.8%) were predicted to bind to any one of the alleles with an IC50 value below 50 nM. Comparative sequence analysis revealed that only 545 of the strong binding peptides are non-self in the human system. Approximately 50% of the binding peptides were monoallele-specific. Moreover, approximately 95% of the predicted strong binding non-self peptides interacted with the binding groove of at least one HLA class II molecule with a glide score better than !10 kcal/mol. On the basis of the analysis of the strength of binding, non-self presentation in the human host, propensity to bind to a higher number of alleles, and energetically favorable interactions with HLA molecules, a set of 11 CD4+ T cell epitopes that can be used as vaccine candidates was identified.

Źródło:

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2021, 102, 1; 43-54
0860-7796

Pojawia się w:

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 89.

Tytuł:

Multi-objective optimization of in-situ bioremediation of groundwater using a hybrid metaheuristic technique based on differential evolution, genetic algorithms and simulated annealing
Wielozadaniowa optymalizacja bioremediacji wód gruntowych in situ z zastosowaniem hybrydowej techniki metaheurystycznej opartej na zróżnicowanej ewolucji, algorytmach genetycznych i symulowanym wyżarzaniu

Autorzy:

Kumar, D.
Ch, S.
Mathur, S.
Adamowski, J.

Powiązania:

https://bibliotekanauki.pl/articles/292714.pdf

Data publikacji:

2015

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

differential evolution
fuzzy logic
genetic algorithm
groundwater
hybrid algorithm
in situ bioremediation
simulated annealing
support vector machine (SVM)
bioremediacja in situ
algorytm hybrydowy
algorytm genetyczny
logika rozmyta
maszyna wektorów nośnych SVM
wyżarzanie symulowane
wody gruntowe
zróżnicowana ewolucja

Opis:

Groundwater contamination due to leakage of gasoline is one of the several causes which affect the groundwater environment by polluting it. In the past few years, In-situ bioremediation has attracted researchers because of its ability to remediate the contaminant at its site with low cost of remediation. This paper proposed the use of a new hybrid algorithm to optimize a multi-objective function which includes the cost of remediation as the first objective and residual contaminant at the end of the remediation period as the second objective. The hybrid algorithm was formed by combining the methods of Differential Evolution, Genetic Algorithms and Simulated Annealing. Support Vector Machines (SVM) was used as a virtual simulator for biodegradation of contaminants in the groundwater flow. The results obtained from the hybrid algorithm were compared with Differential Evolution (DE), Non Dominated Sorting Genetic Algorithm (NSGA II) and Simulated Annealing (SA). It was found that the proposed hybrid algorithm was capable of providing the best solution. Fuzzy logic was used to find the best compromising solution and finally a pumping rate strategy for groundwater remediation was presented for the best compromising solution. The results show that the cost incurred for the best compromising solution is intermediate between the highest and lowest cost incurred for other non-dominated solutions.
Zanieczyszczenie wód gruntowych wyciekami benzyny jest jedną z kilku przyczyn wpływających na środowisko wód podziemnych. W ostatnich latach bioremediacja in situ przyciągała uwagę badaczy z powodu jej zdolności do usuwania zanieczyszczeń w ich siedlisku i niskich kosztów procesu. Przedstawiona praca proponuje użycie nowego algorytmu hybrydowego do optymalizacji wielozadaniowej funkcji, która obejmuje koszty remediacji jako pierwsze zadanie i resztową zawartość zanieczyszczeń po zakończeniu procesu jako drugie z zadań. Algorytm hybrydowy powstał z połączenia metod różnicowej ewolucji, algorytmu genetycznego i symulowanego wyżarzania. Maszyna wektorów nośnych (SVM) została użyta jako wirtualny symulator biologicznej degradacji zanieczyszczeń w wodach gruntowych. Wyniki uzyskane z algorytmy hybrydowego porównano z wynikami zróżnicowanej ewolucji (DE), algorytmu genetycznego (NSGA II) i symulowanego wyżarzania (SA). Stwierdzono, że proponowany algorytm był w stanie zapewnić najlepsze rozwiązanie. Użyto metody z zakresu logiki rozmytej dla znalezienia najlepszego rozwiązania kompromisowego i na końcu przedstawiono dla tego rozwiązania strategię szybkości pompowania celem remediacji wód gruntowych. Wyniki pokazały, że koszty ponoszone na rozwiązanie kompromisowe są pośrednie między najwyższymi i najniższymi kosztami innych rozwiązań.

Źródło:

Journal of Water and Land Development; 2015, 27; 29-40
1429-7426
2083-4535

Pojawia się w:

Journal of Water and Land Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

Cost analysis of a two-unit cold standby system subject to degradation, inspection and priority
Analiza kosztów dwu-elementowego systemu z rezerwą zimną z uwzględnieniem degradacji, kontroli stanu systemu oraz priorytetowości zadań

Autorzy:

Kumar, J.
Kadyan, M. S.
Malik, S. Ch.

Powiązania:

https://bibliotekanauki.pl/articles/301970.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

degradacja
kontrola stanu
priorytetowość
analiza zysku
degradation
inspection
priority
profit analysis

Opis:

The present paper deals with a reliability model incorporating the idea of degradation, inspection and priority. The units may fail completely directly from normal mode. There is a single server who visits the system immediately when required. The original unit undergoes for repair upon failure while only replacement of the duplicate unit is made by similar new one. The original unit does not work as new after repair and so called degraded unit. The system is considered in up-state if any one of new/duplicate/degraded unit is operative. The server inspects the degraded unit at its failure to see the feasibility of repair. If repair of the degraded unit is not feasible, it is replaced by new one similar to the original unit in negligible time. The priority for operation to the new unit is given over the duplicate unit. The distribution of failure time follow negative exponential where as the distributions of inspection, repair and replacement times are assumed as arbitrary. The system is observed at suitable regenerative epochs by using regenerative point technique to evaluate mean time to system failure (MTSF), steady-state availability, busy period and expected number of visits by the server. A particular case is considered to see graphically the trend of mean time to system failure (MTSF), availability and profit with respect to different parameters.
Niniejsza praca dotyczy modelu niezawodności uwzględniającego zagadnienia degradacji, kontroli stanu oraz priorytetowości zadań. Elementy mogą ulegać całkowitemu uszkodzeniu bezpośrednio z trybu normalnego. Istnieje jeden konserwator, który odwiedza system, gdy tylko zachodzi taka potrzeba. W przypadku uszkodzenia, element oryginalny podlega naprawie, podczas gdy element zapasowy (duplikat) podlega jedynie wymianie na nowy, podobny. Po naprawie, element oryginalny nie działa już jako element nowy lecz jako element zdegradowany. System uważa się za zdatny jeżeli pracuje którykolwiek z trzech typów elementów: nowy/rezerwowy/zdegradowany. W przypadku uszkodzenia elementu zdegradowanego, konserwator przeprowadza kontrolę stanu elementu, aby stwierdzić możliwość realizacji naprawy. Jeżeli naprawa elementu zdegradowanego jest niemożliwa, zostaje on wymieniony, w czasie pomijalnym, na element nowy, podobny do elementu oryginalnego. Nowy element uzyskuje priorytet pracy w stosunku do elementu rezerwowego. Rozkład czasu uszkodzenia jest rozkładem wykładniczym ujemnym, a rozkłady czasów kontroli stanu, naprawy i wymiany przyjmuje się jako rozkłady dowolne. System obserwuje się w odpowiednich okresach odnowy wykorzystując technikę odnowy RPT (regenerative point technique) w celu ocenienia średniego czasu do uszkodzenia systemu (MTSF), gotowości stacjonarnej, okresu zajętości oraz oczekiwanej liczby wizyt konserwatora. Przebiegi MTSF, gotowości i zysków w funkcji różnych parametrów przedstawiono w formie graficznej na podstawie studium przypadku.

Źródło:

Eksploatacja i Niezawodność; 2012, 14, 4; 278-283
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 91.

Tytuł:

Numerical study on two dimensional distribution of streamwise velocity in open channel turbulent flows with secondary current effect

Autorzy:

Mohan, S.
Kundu, S.
Ghoshal, K.
Kumar, J.

Powiązania:

https://bibliotekanauki.pl/articles/38616700.pdf

Data publikacji:

2021

Wydawca:

Instytut Podstawowych Problemów Techniki PAN

Tematy:

velocity distribution
open channel flow
turbulent flow
RANS equations
secondary current
finite difference method

Opis:

For studying mechanism of sediment transport in river flows, open channel flow is a prototype. Flow has always three components of velocity for all types of channel geometry and for a time independent uniform flow along streamwise or main flow direction, all the components of velocity are functions of lateral and vertical coordinates. The present study investigates the two dimensional distribution of streamwise (or longitudinal) velocity starting from the Reynolds averaged Navier–Stokes equation for a turbulent open channel flow which is steady and uniform along the main flow direction. Secondary flows both along the vertically upward direction and along the lateral direction are considered which are also taken as functions of lateral and vertical coordinates. Inclusion of the secondary current brings the effect of dip phenomenon in the model. The resulting second order partial differential equation is solved numerically. The model is validated for all the cross-sectional, transverse and centreline velocity distribution by comparing with existing relevant set of experimental data and also with an existing model. Comparison results show good agreement with data as well as with the previous model proving the efficiency of the model. It is found that the transverse velocity distribution depends on the formation of circular vortex in the cross-sectional plane and becomes periodic as the number of circular vortex increases for increasing aspect ratios.

Źródło:

Archives of Mechanics; 2021, 73, 2; 175-200
0373-2029

Pojawia się w:

Archives of Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 92.

Tytuł:

Wear characteristics and defects analysis of friction stir welded joint of aluminium alloy 6061-T6
Charakterystyka zużycia i analiza uszkodzeń złącza ze stopu aluminium 6061-T6 zgrzewanego tarciowo z przemieszaniem

Autorzy:

Kumar, R.
Chattopadhyaya, S.
Hloch, S.
Krolczyk, G.
Legutko, S.

Powiązania:

https://bibliotekanauki.pl/articles/1365830.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

friction stir welding (FSW)
wear
defect
grinding machine
field emission scanning electron microscope (FESEM)
zgrzewanie tarciowe z przemieszaniem
zużycie
uszkodzenie
szlifierka
mikroskopy polowe

Opis:

This paper deals with the wear characteristics and defects developed during friction stir welding at different process parameter of aluminium alloy (AA) 6061-T6 having thickness 6 mm. Four welded samples are prepared with rotational speed 500 rpm, 710 rpm, 1000 rpm and with welding speed of 25 mm/min & 40 mm/min. Welded samples and base material are put in wear condition under grinding machine for 120 s. Material removal is measure by taking the difference of weight before and after wear. Different types of defects and fracture are observed on the wear surface. These defects and fractures are analysed under field emission scanning electron microscope (FESEM). It is concluded that material removal from welded sample is less compared to base metal, hence wear resistance increases after friction stir welding.
Praca dotyczy charakterystyki zużycia i uszkodzeń podczas zgrzewania tarciowego z przemieszaniem stopu aluminium (AA) 6061T6 o grubości 6 mm dla zmiennych parametrów. Cztery zgrzewane próbki były wykonane z prędkością obrotową 500 obr/min, 710 obr/min, 1000 obr/min dla prędkości zgrzewania 25 mm/min i 40 mm/min. Zgrzewane próbki i materiał bazowy były poddawane zużywaniu za pomocą szlifierki w czasie 120 s. Ubytek materiału mierzono jako różnicę wagi przed i po zużywaniu. Różne rodzaje wad i pęknięć zaobserwowano na zużytej powierzchni. Wady i pęknięcia analizowano za pomocą mikroskopu polowego (FESEM). Stwierdzono, że ubytek materiału ze zgrzewanych próbek jest mniejszy w porównaniu z ubytkiem dotyczącym materiału bazowego. Zwiększa się więc odporność na zużycie po zgrzewaniu tarciowym z przemieszaniem.

Źródło:

Eksploatacja i Niezawodność; 2016, 18, 1; 128-135
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Probabilistic analysis of two reliability models of a single-unit system with preventive maintenance beyond warranty and degradation
Analiza probabilistyczna dwóch modeli niezawodności systemu jednoelementowego wykorzystujących pojęcia pogwarancyjnej obsługi profilaktycznej oraz degradacji

Autorzy:

Niwas, R.
Kadyan, M. S.
Kumar, J.

Powiązania:

https://bibliotekanauki.pl/articles/301952.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

probabilistic analysis
reliability
preventive maintenance
warranty
degradation
analiza probabilistyczna
niezawodność
obsługa profilaktyczna
gwarancja
degradacja

Opis:

This paper presents two reliability models of a single-unit system with the concept of preventive maintenance (PM) beyond warranty and degradation. In both the models, repair of any failure during warranty is cost-free to the users, provided failures are not due to the negligence of users. There is a single repairman who always remains with the system. Beyond warranty, the unit goes under PM and works as new after PM (in both models). In model-1, the unit works as new after its repair beyond warranty whereas; in model-2, the unit becomes degraded. After failure, the degraded unit is replaced by a new one. The failure time of the system follows negative exponential distribution while PM, replacement and repair time distributions are taken as arbitrary with different probability density functions. Supplementary variable technique is adopted to derive the expressions for some economic measures such as reliability, mean time to system failure (MTSF), availability and profit function. Using Abel’s lemma, the behaviour of the system in steady-state has been examined. To highlight the behaviour of reliability and profit function, numerical results are considered for particular values of various parameters and repair cost. Profit comparison of both the models is also made to see the usefulness of the concept of degradation.
W artykule przedstawiono dwa modele niezawodności systemu jednoelementowego wykorzystujące pojęcia pogwarancyjnej obsługi profilaktycznej oraz degradacji. Oba modele zakładają, że w okresie gwarancyjnym użytkownik nie ponosi żadnych kosztów związanych z naprawą uszkodzeń, chyba że uszkodzenie powstało wskutek zaniedbania ze strony użytkownika. Obsługi są wykonywane przez jedną ekipę remontową, która zawsze pozostaje na stanowisku. Po upływie okresu gwarancyjnego, urządzenie podlega obsłudze profilaktycznej i po jej przeprowadzeniu działa jak nowe (w obu modelach). Model 1 zakłada, że element po naprawie pogwarancyjnej działa jak nowy, natomiast w Modelu 2, element ulega degradacji. Zdegradowany element, który uległ uszkodzeniu, zostaje wymieniony na nowy. Rozkład czasu uszkodzenia jest rozkładem wykładniczym ujemnym, a rozkłady czasu obsługi profilaktycznej, wymiany i naprawy są traktowane jako arbitralne, o różnych funkcjach gęstości prawdopodobieństwa. Zastosowana technika dodatkowej zmiennej pozwoliła na wyprowadzenie wyrażeń dla niektórych miar ekonomicznych, takich jak niezawodność, średni czas do uszkodzenia systemu (MTSF), gotowość i funkcja zysków. Zachowanie systemu w stanie ustalonym badano z wykorzystaniem lematu Abela. Aby przedstawić zachowanie funkcji niezawodności i zysków, analizowano wyniki numeryczne dla poszczególnych wartości różnych parametrów oraz kosztów naprawy. Porównanie zyskowności badanych modeli umożliwiło weryfikację przydatności pojęcia degradacji.

Źródło:

Eksploatacja i Niezawodność; 2015, 17, 4; 535-543
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Physical properties of coriander seeds at different moisture content

Autorzy:

Balasubramanian, S
Singh, K.K.
Kumar, R.

Powiązania:

https://bibliotekanauki.pl/articles/24535.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Źródło:

International Agrophysics; 2012, 26, 4
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Adaptive Rider Feedback Artificial Tree Optimization-Based Deep Neuro-Fuzzy Network for Classification of Sentiment Grade

Autorzy:

Jasti, Sireesha
Kumar, G.V.S. Raj

Powiązania:

https://bibliotekanauki.pl/articles/2200961.pdf

Data publikacji:

2023

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

deep learning network
feedback artificial tree
natural language processing (NLP)
rider optimization algorithm
sentiment grade classification

Opis:

Sentiment analysis is an efficient technique for expressing users’ opinions (neutral, negative or positive) regarding specific services or products. One of the important benefits of analyzing sentiment is in appraising the comments that users provide or service providers or services. In this work, a solution known as adaptive rider feedback artificial tree optimization-based deep neuro-fuzzy network (RFATO-based DNFN) is implemented for efficient sentiment grade classification. Here, the input is pre-processed by employing the process of stemming and stop word removal. Then, important factors, e.g. SentiWordNet-based features, such as the mean value, variance, as well as kurtosis, spam word-based features, term frequency-inverse document frequency (TF-IDF) features and emoticon-based features, are extracted. In addition, angular similarity and the decision tree model are employed for grouping the reviewed data into specific sets. Next, the deep neuro-fuzzy network (DNFN) classifier is used to classify the sentiment grade. The proposed adaptive rider feedback artificial tree optimization (A-RFATO) approach is utilized for the training of DNFN. The A-RFATO technique is a combination of the feedback artificial tree (FAT) approach and the rider optimization algorithm (ROA) with an adaptive concept. The effectiveness of the proposed A-RFATO-based DNFN model is evaluated based on such metrics as sensitivity, accuracy, specificity, and precision. The sentiment grade classification method developed achieves better sensitivity, accuracy, specificity, and precision rates when compared with existing approaches based on Large Movie Review Dataset, Datafiniti Product Database, and Amazon reviews.

Źródło:

Journal of Telecommunications and Information Technology; 2023, 1; 37--50
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Phase-lag effects in skin tissue during transient heating

Autorzy:

Kumar, R.
Vashishth, A. K.
Ghangas, S.

Powiązania:

https://bibliotekanauki.pl/articles/264536.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

tkanka skórna
transformata Laplace'a
opóźnienie trójfazowe
bioheat transfer
skin tissue
three-phase-lag
Laplace transform
transient heating

Opis:

A three-phase-lag (TPL) model is proposed to describe heat transfer in a finite domain skin tissue with temperature dependent metabolic heat generation. The Laplace transform method is applied to solve the problem. Three special types of heat flux are applied to the boundary of skin tissue for thermal therapeutic applications. The depth of tissue is influenced by the different oscillation heat flux. The comparison between the TPL and dual-phase-lag (DPL) models is analyzed and the effects of phase lag parameters […] and material constant […] on the tissue temperature distribution are presented graphically.

Źródło:

International Journal of Applied Mechanics and Engineering; 2019, 24, 3; 603-623
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Flow behavior in weakly permeable micro-tube with varying viscosity near the wall

Autorzy:

Gupta, R. R.
Kumar, V.
Chand, S.

Powiązania:

https://bibliotekanauki.pl/articles/779656.pdf

Data publikacji:

2017

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

hollow-fiber
micro-tube
permeation
algorithm
variable viscosity
velocity profile
equation of motion
navier-stokes equation

Opis:

Weakly permeable micro-tubes are employed in many applications involving heat and/or mass transfer. During these processes, either solute concentration builds up (mass transfer) or steep change in temperature (heat transfer) takes place near the permeable wall causing a change in the viscosity of the fluid. Results of the present work suggest that such change in viscosity leads to a considerable alteration in the flow behavior, and the commonly assumed parabolic velocity profile no longer exists. To solve the problem numerically, the equation of motion was simplified to represent permeation of incompressible, Newtonian fluid with changing viscosity through a micro-tube. Even after considerable simplification, the accuracy of the results was the same as that obtained by previously reported results for some specific cases using rigorous formulation. The algorithm developed in the present work is found to be numerically robust and simple so that it can be easily integrated with other simulations.

Źródło:

Polish Journal of Chemical Technology; 2017, 19, 4; 16-21
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Hospital selection under Insured Public Health Schemes in the multi-criteria group decision-making environment

Autorzy:

Dev, Manimay
Kumar, Dinesh
Mor, Rahul S.

Powiązania:

https://bibliotekanauki.pl/articles/23966541.pdf

Data publikacji:

2022

Wydawca:

Stowarzyszenie Menedżerów Jakości i Produkcji

Tematy:

opieka zdrowotna
podejmowanie decyzji wielokryterialnej
IFWA
healthcare
Ayushman Bharat
intuitionistic fuzzy-TOPSIS (IF-TOPSIS)

Opis:

A thriving healthcare system perfectly reflects economic development and contentment amongst the people of any region. With increasing anxiety concering health and growing medical needs, hospitals worldwide face substantial challenge to provide patients with adequate medical facilities under one roof. With a fragile state of the health industry in a developing country like India, there is a need for the hospitals to opt for international standards and comply with other premier health centers of the country. This paper aims to select the hospitals based on incongruous and conflicting criteria involving group decision-making using the Intuitionistic Fuzzy (IF) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) method. The criteria used are concomitant to an insured public health scheme named Ayushman Bharat-National Health Protection Scheme (AB-NHPS) of the Government of India. For each alternative Euclidean distance has been used to calculate the positive and negative separation measure from the ideal solution. The relative closeness to the ideal solution has been used to rank the hospitals. The result is a list of hospitals ranked from best to worst based on the laid criteria. It can aid governing bodies in decision-making under an uncertain environment with multiple complex criteria to analyze.

Źródło:

Production Engineering Archives; 2022, 28, 1; 1--11
2353-5156
2353-7779

Pojawia się w:

Production Engineering Archives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Kernel function based regression approaches for estimating the oxygen transfer performance of plunging hollow jet aerator

Autorzy:

Kumar, M.
Tiwari, N. K.
Ranjan, S.

Powiązania:

https://bibliotekanauki.pl/articles/368684.pdf

Data publikacji:

2019

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

volumetric oxygen transfer coefficient
multiple nonlinear regression
Gaussian process regression
support vector regression
współczynnik wnikania tlenu
regresja nieliniowa
proces gaussowski
regresja wektora wsparcia

Opis:

Purpose: To evaluate the capability of various kernels employed with support vector regression (SVR) and Gaussian process regression (GPR) techniques in estimating the volumetric oxygen transfer coefficient of plunging hollow jets. Design/methodology/approach: In this study, a data set of 81 observations is acquired from laboratory experiments of hollow jets plunging on the surface of water in the tank. The jet variables: jet velocity, jet thickness, jet length, and water depth are varied accordingly and the values of volumetric oxygen transfer coefficient is computed. An empirical relationship expressing the oxygenation performance of plunging hollow jet aerator in terms of jet variables is formulated using multiple nonlinear regression. The performance of this nonlinear relationship is compared with various kernel function based SVR and GPR models. Models developed with the training data set (51 observations) are checked on testing data set (24 observations) for performance comparison. Sensitivity analysis is carried out to examine the influence of jet variables in effecting the oxygen transfer capabilities of plunging hollow jet aerator. Findings: The overall comparison of kernels yielded good estimation performance of Radial Basis Function kernel (RBF) and Pearson VII Function kernel (PUK) using the SVR technique which is followed by nonlinear regression, and other kernel function based regression models. Research limitations/implications: The results of the study pertaining to the performance of kernels are based on the current experimental conditions and the estimation potential of the regression models may fluctuate beyond the selection of current data range due to datadependant learning of the soft computing models. Practical implications: Volumetric oxygen transfer coefficient of plunging hollow jets can be predicted precisely using SVR model by employing RBF as kernel function as compared to empirical correlation and other kernel function based regression models. Originality/value: The comparative analysis of kernel functions is conducted in this study. In previous studies, the predictive modelling approaches are implemented in simulating the aeration properties of cylindrical solid jets only, while this paper simulates the volumetric oxygen transfer coefficient of diverging hollow jets with the jet variables by utilizing polynomial, normalized polynomial, PUK, and RBF kernels in SVR and GPR.

Źródło:

Journal of Achievements in Materials and Manufacturing Engineering; 2019, 95, 2; 74-84
1734-8412

Pojawia się w:

Journal of Achievements in Materials and Manufacturing Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Homotopy Perturbation Method of Hydromagnetic Flow and Heat Transfer of a Casson Fluid over an Exponentially Shrinking Sheet

Autorzy:

Murugesan, Thiagarajan
Varshini, S.
Kumar, M. Dinesh

Powiązania:

https://bibliotekanauki.pl/articles/1031915.pdf

Data publikacji:

2020

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Casson Fluid
Homotopy Perturbation method
MHD
Runge-Kutta method
suction

Opis:

Nonlinear hydromagnetic flow and heat transfer of a Casson fluid over an exponentially shrinking sheet has been investigated. The fluid is assumed to be viscous, incompressible and electrically conducting. The similarity transformations are applied to reduce the non-linear partial differential equations into the non-linear ordinary differential equations. Homotopy Perturbation Method is used to solve the resulting non-linear differential equations under appropriate boundary conditions. The impact of Casson fluid parameter, magnetic interaction parameter, suction parameter and Prandtl number on both velocity and temperature profiles are shown graphically. Thermal boundary layer thickness decreases with increasing Prandtl number. Effect of Casson fluid parameter is to reduce both the velocity and temperature. Quantities of physical interest such as skin-friction coefficient, non-dimensional rate of heat transfer are solved numerically. A comparison reveals a remarkable agreement between the Homotopy Perturbation Method and Runge-Kutta fourth order method.

Źródło:

World Scientific News; 2020, 140; 59-78
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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