Skocz do pozycji: 1.

Tytuł:

Swarm Intelligence-based Partitioned Recovery in Wireless Sensor Networks

Autorzy:

Kumar, G.
Ranga, V.

Powiązania:

https://bibliotekanauki.pl/articles/307759.pdf

Data publikacji:

2018

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

connectivity restoration
meta-heuristics
relay node placement
wireless sensor networks

Opis:

The failure rate of sensor nodes in Heterogeneous Wireless Sensor Networks is high due to the use of low battery-powered sensor nodes in a hostile environment. Networks of this kind become non-operational and turn into disjoint segmented networks due to large-scale failures of sensor nodes. This may require the placement of additional highpower relay nodes. In this paper, we propose a network partition recovery solution called Grey Wolf, which is an optimizer algorithm for repairing segmented heterogeneous wireless sensor networks. The proposed solution provides not only strong bi-connectivity in the damaged area, but also distributes traffic load among the multiple deployed nodes to enhance the repaired network’s lifetime. The experiment results show that the Grey Wolf algorithm offers a considerable performance advantage over other state-of-the-art approaches.

Źródło:

Journal of Telecommunications and Information Technology; 2018, 3; 70-81
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: 2.

Tytuł:

Optimization of process parameters of friction stir welded AA5082-AA7075 butt joints using resonance fatigue properties

Autorzy:

Kumar, G.
Kumar, R.

Powiązania:

https://bibliotekanauki.pl/articles/200299.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

friction stir welding
dissimilar Al welding
resonance fatigue analysis
fracture surface analysis
ANOVA

Opis:

In this work, experiments were carried out to quantify the behaviour of friction stir welded (FSW) AA5082-AA7075 butt joints under tensile loading and completely reversed fatigue loading. Different samples were prepared to identify optimum tool rotational and travel speeds to produce FSW AA5082-AA7075 butt joints with the maximum fatigue life. ANOVA was performed, which confirmed that both tool speed nad tool rotation speed affect the tensile strength of the weld. The samples exhibit a considerable difference in their fatigue life and tensile strenght. This difference can be accounted to the presence of welding defects such as surface defects and porosity. S-N curve plotted for the sample shows a significantly high fatigue life at the lower stress ranges. Fracture surfaces were also analysed under scanning electron microscope (SEM). Study of the fracture surface of the sample that failed under fatigue loading showed that the surface was mainly divided in two zones. The first zone was the area of fatigue crack growth where each stress cycle, slowly and gradually, helped in the growth of crack. The second zone was the region of fast fracture where the crack growth resulted in the failure of the joint instantaneously. The fracture surface study of the sample that failed under tensile loading showed that the mode of failure was ductile in nature.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 99-108
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: 3.

Tytuł:

Doping and Irradiation Dependence of Electrical Conductivity of $Fe^{3+}$ and $Ni^{2+}$ Doped Polyvinyl Alcohol Films

Autorzy:

Vijaya Kumar, G.
Chandramani, R.

Powiązania:

https://bibliotekanauki.pl/articles/1537708.pdf

Data publikacji:

2010-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

68.55.Ln
72.80.Le
61.80.x

Opis:

PVA and doped PVA films were prepared by solution casting. The Change in electrical conductivity of pure PVA and transition elements $FeCl_3$ and $NiCl_2 \cdot 6H_2O$ doped PVA films with and without γ-irradiation in the temperature range 50-130°C has been investigated using four point probe technique. The dc electrical conductivity increases with increase in dopant concentration, with temperature and γ-irradiation. The results revealed that γ-irradiation enhances the electrical conductivity. The variation of electrical conductivity σ with temperature, before and after irradiation is due to the intermolecular hydrogen bonding between $Fe^{3+}$ with OH group of PVA and $Ni^{2+}$ with OH group of PVA. We found that $Fe^{3+}$ doped PVA films show higher conductivity than $Ni^{2+}$ doped PVA films.

Źródło:

Acta Physica Polonica A; 2010, 117, 6; 917-920
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

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: 5.

Tytuł:

Characterization and experimental investigation of TiN micro tubular coil heater using raman spectroscopy
Charakterystyka i badania doświadczalne mikro-grzałek z TiN metodą spektroskopii ramanowskiej

Autorzy:

Sureshkannan, G
Mohan Kumar, G
Saravanan, M. P.

Powiązania:

https://bibliotekanauki.pl/articles/354813.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

micro tubular coil heaters
Raman spectroscopy
thermal profile
mikro cewki
spektroskopia ramanowska
profil termiczny

Opis:

Raman spectroscopy is a commonly used tool in bio-diagnostics and micro sensor technology. Surface-enhanced Raman scattering provides high signal enhancements especially at micro and nanostructured metallic surfaces. Micro tubular coil heaters have been widely investigated because of their extensive applications in PET Preformed Moulds, Hot Runner Nozzles & Bushings and Thin Walled Container Moulds and other Microsystems. This paper describes the characterization, experimental investigation and analysis of Titanium Nitride (TiN) micro tubular coil heater using Raman spectroscopy and Comsol multiphysics. The material characterization was performed using Raman spectrometer and the geometric optimization for the micro tubular coil heater was performed by simulating a wide range of possible geometries using COMSOLTM, a commercial Finite Element Analysis (FEA) package. The characteristic dimensions of the microstructures are varied and the results are discussed and compared to each other. The simulated results of micro tubular heaters having an improved temperature distribution over the sensing area and a higher density of integration is presented in this paper.
Spektroskopia ramanowska jest powszechnie stosowanym narzędziem w bio-diagnostyce i technologii mikroczujnika. Powierzchniowo wzmocniona spektroskopia ramanowska zapewnia wysokie wzmocnienie sygnału zwłaszcza na mikro i nanostrukturalnych powierzchniach metalowych. Mikro-grzałki (mikro cewki) były szeroko badane ze względu na ich szerokie zastosowanie w formowaniu wtryskowym, podgrzewaczach dysz i tulej, i cienkościennych formach i innych mikrosystemach. Artykuł opisuje charakterystykę, badania eksperymentalne i analizę mikro-grzałki rurowej z azotku tytanu (TiN) za pomocą spektroskopii ramanowskiej i oprogramowania COMSOL Multiphysics. Charakterystykę materiału przeprowadzono za pomocą spektrometru Ramana a geometryczna optymalizacje dla mikro-grzałki prowadzono symulując szeroki zakres możliwych geometrii, za pomocą COMSOLTU, komercyjnego pakietu do analizy metodą elementów skończonych. Charakterystyczne wymiary mikrostruktur są zróżnicowane, a wyniki zostały omówione i porównane ze sobą. Symulowane wyniki mikro-cylindrycznych grzejników o ulepszonym rozkładzie temperatur w obszarze wykrywania i większej gęstości integracji zostały przedstawione w niniejszym artykule.

Źródło:

Archives of Metallurgy and Materials; 2013, 58, 2; 641-645
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Molecular Interactions in Binary Organic Liquid Mixtures Containing Ethyl Oleate and Ethanol at 2MHz Frequency

Autorzy:

Manukonda, S.
Kumar, G. P.
Babu, C. P.

Powiązania:

https://bibliotekanauki.pl/articles/412193.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Ethyl Oleate
Ethanol
molecular interactions
adiabatic compressibility

Opis:

Molecular interactions of binary mixtures of Ethanol with a new organic compound Ethyl Oleate are investigated at a constant ultrasonic frequency of 2MHz under the temperature range of 303.15K-318.15K. The effect of mole fraction of Ethyl Oleate on velocity of sound wave and the density and viscosity of binary mixtures at various temperatures were studied. The effects on density (ρ), viscosity (η), adiabatic compressibility (βad), inter molecular free length (Lf) and internal pressure (Пi) also was studied.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2015, 40; 17-23
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

A novel revolutionary substantial transformative control technique for solar fed-full bridge converter based energy stabilization for grid connected applications

Autorzy:

Umamaheswari, S.
Karthigaivel, R.
Satheesh Kumar, G.
Vengadachalam, N.

Powiązania:

https://bibliotekanauki.pl/articles/2173656.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

high boost full-bridge converter
battery energy storage system
BESS
revolutionary substantial transformative control technique
RSTC
konwerter pełnomostkowy o wysokim wzmocnieniu
akumulatorowy system magazynowania energii
rewolucyjna technika znaczącej kontroli transformacyjnej

Opis:

Nowadays, there is a need to increase the continuous usage of the power electronic converters like AC-DC, DC–DC, and DC–AC based on various applications like mobile charge controller and telecom base station. Also, for power stability control, these converters are utilized in the renewable energy system (RES). The output cannot be stable for a longer duration due to the inappropriate switching pulse and continued usage of the converter. For resolving the above issues, the soft-switching technique is implemented in the proposed system for controlling both converter and inverter for proper energy stabilization during the continuous operation of devices. The main objective of this work is to improve the solar power system using high voltage gain DC / DC converter. Similarly, an inverter delivers the continuous AC power to the grid system without any fluctuations. The revolutionary substantial transformative control (RSTC) technique has been employed to monitor and control the converters used in this system. The additional advantage of this system is battery-based energy management, which is only utilized under necessary conditions. During the initial stage, RSTC will track the solar power, and it compares with the reference voltage and produces the appropriate pulse to the converter switch. Based on the switching pulse, the full-bridge converter (FBC) will also enhance the DC voltage by providing the constant voltage for the grid-connected inverter system. Secondly, the proposed RSTC controller will be monitoring voltage amplitude and frequency of grid power system. If any variation appears due to source power fluctuation, the controller will recognize it and automatically vary the pulse width modulation (PWM) of an inverter and compensate the grid power. The design analysis and operating approaches of the proposed converter are verified by MATLAB / Simulink 2017b. The performance analysis has been done with various parameters like total harmonics distortion (THD), steady-state error and converter efficiency.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 2; art. no. e140517
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: 8.

Tytuł:

Theoretical evaluation of ultrasonic velocities of binary liquid mixtures of 1-bromopropane in chlorobenzene at 303.15, 308.15, 313.15 and 318.15 K

Autorzy:

Babu, Ch. P.
Kumar, G. P.
Nagarjun, B.
Samatha, K.

Powiązania:

https://bibliotekanauki.pl/articles/412079.pdf

Data publikacji:

2014

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

ultrasonic velocities
molecular interactions
1-bromopropane and chlorobenzene

Opis:

Theoretical velocities of binary liquid mixtures of 1-bromopropane with chlorobenzene at 2 MHz and four different temperatures 303.15, 308.15, 313.15 and 318.15 K, have been evaluated as a function of concentration and temperature. The experimental values are compared with theoretical models of liquid mixtures such as Nomoto, Van Dael-Vangeel, Impedance Relation, Rao’s Specific Velocity Method, Junjie’s relations and Free Length Theory. In the chosen system there is a good agreement between experimental and theoretical values calculated by Nomoto’s theory. The deviation in the variation of U2exp/ U2imx from unity has also been evaluated for explaining the non ideality in the mixtures. The results are explained in terms of intermolecular interactions occurring in these binary liquid mixtures.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2014, 11, 1; 9-17
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

One-step synthesis of highly-biocompatible spherical gold nanoparticles using Artocarpus heterophyllus Lam. (jackfruit) fruit extract and its effect on pathogens

Autorzy:

Basavegowda, N.
Kumar, G.D.
Tyliszczak, B.
Wzorek, Z.
Sobczak-Kupiec, A.

Powiązania:

https://bibliotekanauki.pl/articles/51469.pdf

Data publikacji:

2015

Wydawca:

Instytut Medycyny Wsi

Źródło:

Annals of Agricultural and Environmental Medicine; 2015, 22, 1
1232-1966

Pojawia się w:

Annals of Agricultural and Environmental Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Acoustical studies of binary liquid mixtures of p-chlorotoluene in benzene at different temperatures

Autorzy:

Kumar, G. P.
Babu, Ch. P.
Samatha, K
Jyosthna, A. N.
Showrilu, K.

Powiązania:

https://bibliotekanauki.pl/articles/412275.pdf

Data publikacji:

2014

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

ultrasonic velocity
thermodynamic parameters
p-chlorotoluene
molecular interactions

Opis:

Ultrasonic velocities (U), densities (ρ), and coefficient of viscosities (η) are measured for binary mixtures containing (i) p-chlorotoluene and (ii) benzene at 303.15 K, 308.15 K, 313.15 K and 318.15 K to understand the molecular interaction. Various acoustical parameters such as adiabatic compressibility (βad), free length (Lf), acoustic impedance (Z), free volume (Vf), molar volume (Vm), Rao’s constant (R), Wada’s constant (W) and internal pressure (πi), are calculated from the measured values of U, ρ, and η. The trend in acoustical parameters also substantiates to asses strong molecular interactions.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2014, 10; 25-37
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

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: 12.

Tytuł:

Indirect torque observer-based sensor-less efficient control of bearingless switched reluctance motor using global sliding mode and square currents control method

Autorzy:

Rao, Pulivarthi Nageswara
Devarapalli, Ramesh
Marquez, Fausto Pedro Garcia
Kumar, G. V. Nagesh
Mohammadi-Ivatloo, Behnam

Powiązania:

https://bibliotekanauki.pl/articles/1409027.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

bearingless
global sliding mode
efficient: maintenance
safety
torque ripple

Opis:

The Bearingless Switched Reluctance Motor (BSRM) is a new technology motor, which overcomes the problems of maintenances required associated with mechanical contacts and lubrication of rotor shaft effectively. In addition, it also improves the output power developed and rated speed. Hence, the BSRM can achieve high output power and super high speed with less size and cost. It has a considerable ripple in the net-torque due to its critical non-linearity and the salient pole structures of both stator and rotor poles. The resultant torque ripple, especially in these motors, causes the more vibrations and acoustic noises will affects the levitated rotor safety also. Practically at high-speed operations, the accurate measurement of the rotor position is complicated for conventional mechanical sensors. A new square currents control with global sliding mode control based sensorless torque observer is proposed to minimize the torque ripple and achieve a smooth, robust operation without using any mechanical sensors. The proposed controller is designed based on the error between the reference and measured torque values. The sliding mode torque observer measures the torque from the actual phase voltages, currents, and look-up tables. The simulation model has been modelled to validate the proposed methodology. From the simulation outputs, it is clear that the reduction of torque ripple by the proposed method shows improved than the conventional sliding mode controller. The overall system is more robust to the external disturbances, and it also gets efficient torque profile.

Źródło:

Archives of Control Sciences; 2021, 31, 1; 53-80
1230-2384

Pojawia się w:

Archives of Control Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Scrutinization of Joule heating and viscous dissipation on MHD flow and melting heat transfer over a stretching sheet

Autorzy:

Kumar, K. G.
Gireesha, B. J.
Manjunatha, S.

Powiązania:

https://bibliotekanauki.pl/articles/264626.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

metoda numeryczna
dyssypacja lepkości
płyn mikropolarny
Joule heating
viscous dissipation
stretching sheet
micro polar dusty fluid
numerical method

Opis:

The present paper deals with an analysis of the combined effect of Joule heating and viscous dissipation on an MHD boundary layer flow and melting heat transfer of a micro polar fluid over a stretching surface. Governing equations of the problem are transformed into a set of coupled nonlinear ordinary differential equations by applying proper transformations and then they are solved numerically using the RKF-45 method. The method is verified by a comparison with the established results with limiting solution. The influence of the various interesting parameters on the flow and heat transfer is analyzed in detail through plotted graphs.

Źródło:

International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 429-443
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: 14.

Tytuł:

Thermal analysis of generalized Burgers nanofluid over a stretching sheet with nonlinear radiation and non uniform heat source/sink

Autorzy:

Kumar, K. G.
Ramesh, G. K.
Gireesha, B. J.

Powiązania:

https://bibliotekanauki.pl/articles/240767.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

burgers nanofluid
non-uniform heat source/sink
non-linear radiation
magnetic field
stretching surface
pole magnetyczne
powierzchnia
rozciąganie
promieniowanie
nanofluid

Opis:

The work deals with the heat analysis of generalized Burgers nanofluid over a stretching sheet. The Rosseland approximation is used to model the non-linear thermal radiation and incorporated non-uniform heat source/sink effect. The governing equations reduced to a set of nonlinear ordinary differential equations under considering the suitable similarity transformations. The obtained ordinary differential equations equations are solved numerically by Runge-Kutta-Fehlberg order method. The effect of important parameters on velocity, temperature and concentration distributions are analyzed and discussed through the graphs. It reveals that temperature increases with the increase of radiation and heat source/sink parameter.

Źródło:

Archives of Thermodynamics; 2018, 39, 2; 97-122
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Automatic detection of brain tumors using genetic algorithms with multiple stages in magnetic resonance images

Autorzy:

Annam, Karthik
Kumar, Sunil G.
Babu, Ashok P.
Domala, Narsaiah

Powiązania:

https://bibliotekanauki.pl/articles/27314266.pdf

Data publikacji:

2022

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

MRI brain tumor
GLCM
SURF
genetic optimization
advanced machine learning

Opis:

The field of biomedicine is still working on a solution to the challenge of diagnosing brain tumors, which is now one of the most significant challenges facing the profession. The possibility of an early diagnosis of brain cancer depends on the development of new technologies or instruments. Automated processes can be made possible thanks to the classification of different types of brain tumors by utilizing patented brain images. In addition, the proposed novel approach may be used to differentiate between different types of brain disorders and tumors, such as those that affect the brain. The input image must first undergo pre-processing before the tumor and other brain regions can be separated. Following this step, the images are separated into their respective colors and levels, and then the Gray Level Co-Occurrence and SURF extraction methods are used to determine which aspects of the photographs contain the most significant information. Through the use of genetic optimization, the recovered features are reduced in size. The cut-down features are utilized in conjunction with an advanced learning approach for the purposes of training and evaluating the tumor categorization. Alongside the conventional approach, the accuracy, inaccuracy, sensitivity, and specificity of the methodology under consideration are all assessed. The approach offers an accuracy rate greater than 90%, with an error rate of less than 2% for every kind of cancer. Last but not least, the specificity and sensitivity of each kind are higher than 90% and 50%, respectively. The usage of a genetic algorithm to support the approach is more efficient than using the other ways since the method that the genetic algorithm utilizes has greater accuracy as well as higher specificity.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2022, 16, 4; 36--43
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: 16.

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: 17.

Tytuł:

Kinetic, Equilibrium and Thermodynamic studies on the removal of Cr(VI) by activated carbon prepared from Cajanus Cajan(L) Milsp seed shell

Autorzy:

Thamilarasu, P.
Kumar Vijaya, G.
Tamilarasan, R.
Sivakumar, V.
Karunakaran, K.

Powiązania:

https://bibliotekanauki.pl/articles/779758.pdf

Data publikacji:

2011

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

adsorpcja
izoterma
węgiel
chrom i nasiona powłoki
adsorption
isotherm
activated carbon
chromium and seed shell

Opis:

This paper presents the feasibility of the removal of hexavalent chromium ions from aqueous solutions by using activated carbon prepared from Cajanus Cajan(L) Milsp. It was carbonized and activated by treating it with concentrated sulfuric acid followed by heating for 5 h at 500oC. Batch adsorption experiments were carried out as a function of pH, contact time, initial concentration of the adsorbate, adsorbent dosage and temperature. The experimental data fi tted well to the Freundlich isotherm. The thermodynamic parameters such as ΔHo, ΔSo, and ΔGo were calculated, which indicated that the adsorption was spontaneous and endothermic in nature. The adsorbent used in this study was characterized by FT-IR and SEM before and after the adsorption of metal ions. The results indicate that Cajanus Cajan(L) Milsp can be employed as a low cost alternative and commercial adsorbents in the removal of chromium (VI) from water and waste water.

Źródło:

Polish Journal of Chemical Technology; 2011, 13, 4; 1-7
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

An unsteady flow and melting heat transfer of a nanofluid over a stretching sheet embedded in a porous medium

Autorzy:

Kumar, K. G.
Gireesha, B. J.
Rudraswamy, N. G.
Krishnamurthy, M. R.

Powiązania:

https://bibliotekanauki.pl/articles/947337.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

efekt topnienia
reakcja chemiczna
podłoże porowate
przepływ niestabilny
melting effect
chemical reaction
nanofluid
porous medium
stretching sheet
unsteady flow

Opis:

An unsteady flow and melting heat transfer of a nanofluid over a stretching sheet was numerically studied by considering the effect of chemical reaction and thermal radiation. The governing non-linear partial differential equations describing the flow problem are reduced to a system of non-linear ordinary differential equations using the similarity transformations and solved numerically using the Runge–Kutta–Fehlberg fourth–fifth order method. Numerical results for concentration, temperature and velocity profiles are shown graphically and discussed for different physical parameters. Effect of pertinent parameters on momentum, temperature and concentration profiles along with local Sherwood number, local skin-friction coefficient and local Nusselt number are well tabulated and discussed.

Źródło:

International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 245-258
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: 19.

Tytuł:

Protuberance-mediated high frequency of adventitious shoot regeneration from sweetpotato leaf explants [Ipomoea batatas (L.) Lam.]

Autorzy:

Ashok Kumar, H.G.
Ku, A.T.
Agrawal, P.
Mahesh, S.
Yeh, K.-W.

Powiązania:

https://bibliotekanauki.pl/articles/80764.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

adventitious shoot
organogenesis
sweet potato
Ipomoea batatas
plant regeneration
leaf explant

Źródło:

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 4
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: 20.

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: 21.

Tytuł:

Cu2+/Zeolite catalyzed synthesis and evaluation of antimicrobial activities of some chalcones

Autorzy:

Thirunarayanan, G.
Kumar, N. Dinesh

Powiązania:

https://bibliotekanauki.pl/articles/1179609.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Antimicrobial activities
Aryl chalcones
Cu2+/Zeolite
IR and NMR spectra

Opis:

Some aryl chalcones have been synthesized by Cu2+/Zeolite catalyzed aldol condensation of aryl methyl ketones and substituted benzaldehydes under microwave irradiation conditions. The yields of the synthesized chalcones are more than 85%. These chalcones were characterized by their physical constants and spectroscopic data. The antimicrobial activities of synthesized chalcones were studied by Bauer-Kirby disc diffusion method.

Źródło:

World Scientific News; 2017, 74; 251-266
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

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: 23.

Tytuł:

Vorticity transport analysis in magnetic viscoelastic fluid

Autorzy:

Kumar, P.
Mohan, H.
Hoshoudy, G.

Powiązania:

https://bibliotekanauki.pl/articles/281534.pdf

Data publikacji:

2016

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

Rivlin-Ericksen viscoelastic fluid
suspended magnetic particles
vorticity

Opis:

Results of investigation on the transport of vorticity in Rivlin-Ericksen viscoelastic fluid in the presence of suspended magnetic particles is presented here. Equations governing the transport of vorticity in Rivlin-Ericksen viscoelastic fluid in the presence of suspended magnetic particles are obtained from the equations of magnetic fluid flow. From these equations it follows that the transport of solid vorticity is coupled with the transport of fluid vorticity. Further, we find that because of thermokinetic process, fluid vorticity may exist in the absence of solid vorticity, but when fluid vorticity is zero, then solid vorticity is necessarily zero. A two-dimensional case is also studied and found that the fluid vorticity is indirectly influenced by the temperature and the magnetic field gradient.

Źródło:

Journal of Theoretical and Applied Mechanics; 2016, 54, 1; 127-133
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Genetic Algorithm for Combined Speaker and Speech Recognition using Deep Neural Networks

Autorzy:

Kaur, G.
Srivastava, M.
Kumar, A.

Powiązania:

https://bibliotekanauki.pl/articles/958089.pdf

Data publikacji:

2018

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

deep neural networks
genetic algorithm
LPCC
MFCC
PLP
RASTA-PLP
speaker recognition
speech recognition

Opis:

Huge growth is observed in the speech and speaker recognition field due to many artificial intelligence algorithms being applied. Speech is used to convey messages via the language being spoken, emotions, gender and speaker identity. Many real applications in healthcare are based upon speech and speaker recognition, e.g. a voice-controlled wheelchair helps control the chair. In this paper, we use a genetic algorithm (GA) for combined speaker and speech recognition, relying on optimized Mel Frequency Cepstral Coefficient (MFCC) speech features, and classification is performed using a Deep Neural Network (DNN). In the first phase, feature extraction using MFCC is executed. Then, feature optimization is performed using GA. In the second phase training is conducted using DNN. Evaluation and validation of the proposed work model is done by setting a real environment, and efficiency is calculated on the basis of such parameters as accuracy, precision rate, recall rate, sensitivity, and specificity. Also, this paper presents an evaluation of such feature extraction methods as linear predictive coding coefficient (LPCC), perceptual linear prediction (PLP), mel frequency cepstral coefficients (MFCC) and relative spectra filtering (RASTA), with all of them used for combined speaker and speech recognition systems. A comparison of different methods based on existing techniques for both clean and noisy environments is made as well.

Źródło:

Journal of Telecommunications and Information Technology; 2018, 2; 23-31
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: 25.

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: 26.

Tytuł:

Mechanical & Thermal Properties of Epoxy Based Hybrid Composites Reinforced with Jute / Sansevieria cylindrica Fibres

Autorzy:

Kumar, M. A.
Reddy, G. R.

Powiązania:

https://bibliotekanauki.pl/articles/411940.pdf

Data publikacji:

2014

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

jute fiber
hybrid composites
mechanical properties
Sc fiber
thermal properties

Opis:

Tensile properties are studied to assess the influence of fiber weight. Room temperature cured epoxy was impregnated with jute/Sc in order to evaluate the performance of hybrid composites. Jute/Sc fibers are taken in the 1:1 weight ratios to suspend on epoxy resin with different fiber lengths such as 1, 2, 3 and 4 cm. The variations of aforementioned properties on hybrid composites with different fiber lengths have been studied. Significant improvement in tensile strengths of the jute/Sc hybrid composites has been observed by the alkali treatments. Thermal properties such as TGA and DSC are studied to investigate the influence of change in fibre length on treated and untreated hybrid composites in which 4 °C rise in decomposition temperature, 3 °C rise for glass transition temperature respectively.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2014, 19, 2; 191-197
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Forecasting return products in an integrated forward/reverse supply chain utilizing an ANFIS

Autorzy:

Kumar, D. T.
Soleimani, H.
Kannan, G.

Powiązania:

https://bibliotekanauki.pl/articles/329809.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

artificial neural network
adaptive network based fuzzy
inference system
closed loop supply chain
forecasting methods
fuzzy neural network
sztuczna sieć neuronowa
system wnioskowania
metoda prognozowania
sieć neuronowa rozmyta

Opis:

Interests in Closed-Loop Supply Chain (CLSC) issues are growing day by day within the academia, companies, and customers. Many papers discuss profitability or cost reduction impacts of remanufacturing, but a very important point is almost missing. Indeed, there is no guarantee about the amounts of return products even if we know a lot about demands of first products. This uncertainty is due to reasons such as companies’ capabilities in collecting End-of-Life (EOL) products, customers’ interests in returning (and current incentives), and other independent collectors. The aim of this paper is to deal with the important gap of the uncertainties of return products. Therefore, we discuss the forecasting method of return products which have their own open-loop supply chain. We develop an integrated two-phase methodology to cope with the closed-loop supply chain design and planning problem. In the first phase, an Adaptive Network Based Fuzzy Inference System (ANFIS) is presented to handle the uncertainties of the amounts of return product and to determine the forecasted return rates. In the second phase, and based on the results of the first one, the proposed multi-echelon, multi-product, multi-period, closed-loop supply chain network is optimized. The second-phase optimization is undertaken based on using general exact solvers in order to achieve the global optimum. Finally, the performance of the proposed forecasting method is evaluated in 25 periods using a numerical example, which contains a pattern in the returning of products. The results reveal acceptable performance of the proposed two-phase optimization method. Based on them, such forecasting approaches can be applied to real-case CLSC problems in order to achieve more reliable design and planning of the network.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2014, 24, 3; 669-682
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: 28.

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: 29.

Tytuł:

A simplistic regression-based genetic algorithm optimization of tool-work interface temperature

Autorzy:

Utkarsh
Kumar, Saumya
Kumar, Saaransh
Kiran, G. Uday
Mukhopadhyay, Arkadeb
Barman, Manik

Powiązania:

https://bibliotekanauki.pl/articles/38884187.pdf

Data publikacji:

2022

Wydawca:

Instytut Podstawowych Problemów Techniki PAN

Tematy:

turning
tool-work thermocouple
cutting temperature
ANOVA

Opis:

This work aims to investigate the average tool-work interface temperature for the HSS tool and AISI 1040 steel pair. A tool-work thermocouple is proposed for the measurement of temperature because of its simple construction in addition to the low cost. The machining process of AISI 1040 steel is considered due to its extensive application, including industry usage. The changes in cutting temperature are studied for combinations of cutting speed, feed and the depth of cut during turning operation. The orthogonal array L₉ by Taguchi is adopted for designing the experiments within a restricted set of runs. The average cutting temperature shows an increasing curve with functions of speed versus depth of cut and speed versus feed. But no clear trend is observed for a combination of feed versus depth of cut. A second-order regression equation with reasonable accuracy (R² = 0.99) is fitted using the data. Analysis of variance (ANOVA) reveals the highest contribution from cutting speed, which influences average temperature at the interface of tool and work. Further, the genetic algorithm predicts an optimal combination of parameters, which is 82.542 m/min cutting speed, 0.276 mm/rev feed rate and 0.2 mm depth.

Źródło:

Engineering Transactions; 2022, 70, 2; 141-156
0867-888X

Pojawia się w:

Engineering Transactions

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Spatial Distribution of Rainfall with Elevation in Satluj River Basin: 1986-2010, Himachal Pradesh, India

Autorzy:

Kumar, Sandeep
Gil, G. S.
Santosh, Santosh

Powiązania:

https://bibliotekanauki.pl/articles/1193947.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

DEM
GIS
Himalayas
Interpolation
Orographic effect
Precipitation
Satluj River Basin

Opis:

The complex relationship between topography and precipitation in mountainous regions such as Himalayas is evident from the pattern of rainfall distribution. The variation in precipitation with altitude is controlled by mean height of clouds and decrease in water vapours with altitude. Spatially distributed measurements of precipitation have gained renewed interest in connection with climate change impact studies. Precipitation values are usually available from a limited number of gauge stations and their spatial estimates can be obtained by interpolation techniques such as Inverse Distance Weighted (IDW), Kriging and Spline. In the present study, precipitation-elevation relationship can be established using Digital Elevation Model (DEM) (Advanced Spaceborne Thermal Emission and Reflection Radiometer-ASTER, 30m resolution), Spline interpolation technique in Geographical Information System (GIS) environment and point data from various gauge stations spread over the Satluj River Basin. Changes of spatial distribution of precipitation with elevation show a distinct shift. Bhakra Dam (5854.60 mm) to Rampur (4451.10 mm), there is continuous variation in rainfall with increase in altitude. But beyond Rampur, variation is very high. Swarghat shows exceptional rainfall (8031.76 mm), may be due to position of mountains and their orographic effects. Maximum rainfall was observed in the lower Himalayas i.e. Shiwalik range. Negligible rainfall was observed beyond Kaza (470 mm), above the elevation of around 3756 m. The general trend of rainfall exhibits that the lower and middle parts experience good rainfall whereas the upper part experiences less rainfall. Such spatial and temporal distribution of rainfall with elevation provides an important platform for hydrologic analysis, planning and management of water resources.

Źródło:

World Scientific News; 2015, 19; 1-15
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Trend analysis of rainfall in Satluj River Basin, Himachal Pradesh, India

Autorzy:

Kumar, Sandeep
Gill, G. S.
Santosh, Santosh

Powiązania:

https://bibliotekanauki.pl/articles/1193980.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Himachal Pradesh
Mann-Kendall test
Rainfall
Regression
Satluj River Basin
Trend analysis

Opis:

attention recently, especially in connection with climate change. The changing pattern of rainfall deserves urgent and systematic attention for planning, development, utilisation and management of water resources. The daily data on variable were converted to monthly and then computed to seasonal and annual series. Annual rainfall (mm/yr) was calculated as the sum of monthly values. The missing values in the data were computed by using average method. The records of rainfall 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, data were computed into standardised precipitation indices (SPI). These standardised data series were plotted against time and the linear trends observed were represented graphically. Trend analysis results of rainfall show that out of 15 annual trends 6 (40%) are increasing and 9 (60%) are decreasing in nature where 1 (6.6%) is statistically significant (increasing) and 2 (13.3%) are statistically significant (decreasing) at 95% confidence level. Similarly, the changes were investigated for the four seasons: winter (December-March), pre-monsoon (April-June), monsoon (July-September) and post-monsoon (October-November). The analysis of rainfall, annual as well as seasonal, of different gauge stations in Satluj River Basin showed a large variability in the trends and magnitudes from 1984 to 2010. The rainfall shows great temporal and spatial variations, unequal seasonal distribution with frequent departures from normal. Majority of gauge stations have experienced decreasing trends, both on seasonal and annual scales. Some were statistically significant at 95% confidence level. The sensitivity of rainfall variations provides important insight regarding the responses and vulnerability of different areas to climate change. It will further strengthen the formulation of future strategy for management of water resources.

Źródło:

World Scientific News; 2015, 14; 1-55
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 32.

Tytuł:

Economic based evaluation of DGs in capacitor allocated optimal distribution network

Autorzy:

Srinivasan, G.
Amaresh, K.
Cheepati, Kumar Reddy

Powiązania:

https://bibliotekanauki.pl/articles/2173535.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

ISSOT-WF
capacitor placement
capacitor sizing
feeder reconfiguration
dispersed generation
electrical distribution network
additional power loss reduction
rozmieszczenie kondensatorów
wymiarowanie kondensatorów
rekonfiguracja podajnika
generacja rozproszona
sieć dystrybucji energii
redukcja strat mocy

Opis:

Feeder reconfiguration (FR), capacitor placement and sizing (CPS) are the two renowned methods widely applied by the researchers for loss minimization with node voltage enrichment in the electrical distribution network (EDN), which has an immense impact on economic savings. In recent years, optimization of FR and CPS together can proficiently yield better power loss minimization and save costs compared to the individual optimization of FR and CPS. This work proposes an application of an improved salp swarm optimization technique based on weight factor (ISSOT-WF) to solve the cost-based objective function using CPS with and without FR for five different cases and three load levels, subject to satisfying operating constraints. In addition, to ascertain the impact of real power injection on additional power loss reduction, this work considers the integration of dispersed generation units at three optimal locations in capacitive compensated optimal EDN. The effectiveness of ISSOT-WF has been demonstrated on the standard PG&E-69 bus system and the outcomes of the 69-bus test case have been validated by comparing with other competing algorithms. Using FR and CPS at three optimal nodes and due to power loss reduction, cost-saving reached up to a maximum of 71%, and a maximum APLR of 26% was achieved after the installation of DGs at three optimal locations with the significant improvement in the bus voltage profile.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 1; e139053, 1--10
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 33.

Tytuł:

Biodegradable Sansevieria cylindrica Leaves fiber/ Tamarind fruit fiber based Polymer hybrid composites on characterization

Autorzy:

Reddy, G. R.
Kumar, M. A.
Jayaramudu, J.

Powiązania:

https://bibliotekanauki.pl/articles/411831.pdf

Data publikacji:

2014

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

hybrid composites
mechanical properties
thermal
SEM

Opis:

This paper deals with the preparation and characterization of epoxy tamarind fruit (Tf) and Sansevieria cylindrica (Sc) hybrid composites containing fiber 0:20, 5:15, 10:10, 15:5 and 20:0 of (Tf:Sc) combinations loading. Sansevieria cylindrica leaves were used in this paper for extracting fiber out of it and in the similar manner ripen Tamarind fruit was used to extract fiber. Two different fibers viz. tamarind fruit/ Sansevieria cylindrica fibers were loaded into the epoxy system to develop the hybrid composites. The tensile and flexural properties of the resulting 20 wt. % loading of Tf/Sc/epoxy hybrid composites were examined. The resulting hybrid composites of 20 wt. % Tf/Sc with varying combinations exhibit the optimum improvement of mechanical properties and dielectric strength. 2 °C rise in decomposition temperature and 5 °C rise glass transition temperature were observed from the TGA and DSC thermal analysis. The fractured cross sections of flexural samples were assessed their performance as a function of fiber loading of Tf/Sc/epoxy hybrid composites by SEM analysis.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2014, 20, 2; 116-118
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 34.

Tytuł:

Assessment of water physico-chemical characteristics and statistical evaluation of Narmada Estuarine Region, Gujarat, India
Analiza i statystyczne opracowanie fizyczno-chemicznych właściwości wody z estuarium Narmada, Gujarat, Indie

Autorzy:

Nirmal Kumar, I. J.
Basil, G.
Nirmal Kumar, R.
Sajish, P. R.
Shailendra, V.

Powiązania:

https://bibliotekanauki.pl/articles/292696.pdf

Data publikacji:

2012

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

analiza głównych składowych
estuarium Narmada
parametry fizyczno-chemiczne
sezonowość
statystyka wielowymiarowa
multivariate statistics
Narmada estuary
physico-chemical parameters
principal component analysis
seasonality

Opis:

Investigations on physicochemical parameters (temperature, pH, salinity, dissolved oxygen), including dissolved nutrients (PO₄-P, NO₃-N, SiO₄-Si) and chlorophyll-a were carried out in the water off the mouth of the Narmada estuary from July 2008 to June 2009. The multivariate statistics and principal component analysis applied to the datasets, indicated two factors during the whole study period influencing variability in the water to the extent of 72%. Principal axis factoring and alpha factoring have been used to observe the mode of association of parameters and their interrelationships, for evaluating water quality. The results indicated the addition of phosphates and silicates to the coastal water by the Narmada estuary from natural sources during study period. The study indicated that the Narmada estuary adds sufficiently well-oxygenated, nutrient-rich water to the coastal region.
Analizę parametrów fizyczno-chemicznych (temperatura, pH, zasolenie, tlen rozpuszczony), stężenia pierwiastków biogennych (PO₄-P, NO₃-N, SiO₄-Si) i chlorofilu prowadzono w wodach estuarium Narmada od lipca 2008 do czerwca 2009. Statystyka wielowymiarowa i analiza głównych składowych, zastosowana do zbioru wyników, wskazała dwa czynniki, które w 72% odpowiadały za zmienność składu chemicznego wody w całym okresie badań. Do oceny jakości wody zastosowano analizę czynnikową celem określenia powiązań między parametrami i ich wzajemnych zależności. Wyniki pokazały, że w okresie badawczym estuarium Narmada dostarczało do wód przybrzeżnych fosforany i krzemiany pochodzące z naturalnych źródeł. Przeprowadzone badania dowodzą, że estuarium Narmada zasila strefę brzegową w dobrze natlenione i bogate w pierwiastki biogenne wody.

Źródło:

Journal of Water and Land Development; 2012, no. 16 [I-VI]; 43-48
1429-7426
2083-4535

Pojawia się w:

Journal of Water and Land Development

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 35.

Tytuł:

Investigation of the Influence of Stretch on the Air Permeability of Knitted Fabric: Effect of Loop Length
Badanie wpływu rozciągnięcia dzianin na przepuszczalność powietrza. Wpływ długości pętli

Autorzy:

Kumar, V.
Prakash, C.
Manigandan, G.
Sampath, V. R.

Powiązania:

https://bibliotekanauki.pl/articles/1419911.pdf

Data publikacji:

2021

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

air permeability
comfort
knitted fabrics
loop length
relaxation
stretch
przepuszczalność powietrza
wygoda
dzianiny
długość pętli
rozciągliwość

Opis:

Most of the time, a certain degree of stretch prominently and incrementally occurs in intimate wear, leisure wear, sportswear, medical textiles etc., during their action. Variations in the stretch gradient would definitely cause changes in the air permeability of knitted fabrics. The influence of variables such as loop length, the presence of an elastomeric component and fabric structure on the air permeability of cotton single jersey and pique knitted fabrics in a stretched state was critically analysed. In this work, changes in the air permeability of cotton jersey samples with and without elastomer were investigated and reported by keeping the samples in static up to an incremental stretch of 40% at a rate of 10% of the stretch gradient, in a dry relaxed state, wet relaxed state and fully relaxed state.
W większości przypadków, podczas użytkowania odzieży rekreacyjnej, sportowej, medycznej itp. występuje pewien stopień rozciągnięcia. Wahania gradientu rozciągliwości powodują zmiany przepuszczalności powietrza dzianin. W pracy przeanalizowano wpływ zmiennych, takich jak: długość pętli, obecność składnika elastomerowego i rodzaju struktury na przepuszczalność powietrza dzianin bawełnianych typu single jersey i typu pique w stanie rozciągniętym. W pracy zbadano i odnotowano zmiany przepuszczalności powietrza w przypadku próbek dżerseju bawełnianego z elastomerem i bez elastomeru, utrzymując próbki w stanie statycznym do przyrostowego rozciągnięcia 40% z 10% gradientem rozciągania w stanie mokrym i suchym.

Źródło:

Fibres & Textiles in Eastern Europe; 2021, 1 (145); 53-56
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 36.

Tytuł:

Lean Tool Implementation in the Garment Industry
Wdrożenie narzędzi „Lean Management” w przemyśle odzieżowym

Autorzy:

Kumar, D. Vasanth
Mohan, G. Madhan
Mohanasundaram, K. M.

Powiązania:

https://bibliotekanauki.pl/articles/233304.pdf

Data publikacji:

2019

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

lean tools
value stream mapping
5S
line balancing
narzędzia
mapowanie strumienia wartości
równoważenie linii

Opis:

Garment Manufacturing is one of the oldest in the world, compromising a high number of critical operations. The main issues in the garment industry are the lead time, production rate, very poor line balancing and fabric wastes. Productivity improvement is carried out by implementing the various lean tools in the industry, such as 5S, Value Stream Mapping (VSM) and line balancing in the sewing section. After the implementation of lean tools in the garment industry, the outcomes observed are a reduction in work-in-progress inventory, increases in the production process and increased line efficiency. Similarly the before and after implementation of 5S, which shows space utilisation in the sewing section, is increased. In this research, an implementation study was conducted in only one organisation. Hence the results extracted by the conduct of this implementation study are achievable and adaptable in similar organisations.
Główne problemy w przemyśle odzieżowym to czas realizacji, tempo produkcji, bardzo niska równowaga linii i marnotrawstwo tkanin. Celem pracy było uzyskanie poprawy produktywności poprzez wdrożenie różnych narzędzi „Lean Management” w branży, takich jak 5S, Mapowanie Strumienia Wartości (VSM) i równoważenie linii w dziale szycia. Po wdrożeniu narzędzi „Lean Management” w przemyśle odzieżowym na podstawie uzyskanych rezultatów zaobserwowano zmniejszenie zapasów w toku prac, zwiększenie procesu produkcji i zwiększenie wydajności linii. Przedstawione w pracy wyniki dotyczą badania wdrożeniowego przeprowadzonego w jednej organizacji. W związku z tym wyniki uzyskane w ramach tego badania są możliwe do osiągnięcia i dostosowania w podobnych organizacjach.

Źródło:

Fibres & Textiles in Eastern Europe; 2019, 2 (134); 19-23
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 37.

Tytuł:

Biuret: a Potential Burning Rate Suppressant in Ammonium Chlorate(VII) Based Composite Propellants

Autorzy:

Dey, A.
Ghorpade, V. G.
Kumar, A.
Gupta, M.

Powiązania:

https://bibliotekanauki.pl/articles/358579.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

burning rate suppressants
biuret
burning rate
HTPB
composite propellant

Opis:

Several composite propellant compositions containing various concentrations of biuret, a new burning rate suppressant, were formulated and studied to optimize the concentration of biuret in the composite propellant. Biuret was used here for the first time in a composite propellant as a burning rate suppressant. The theoretical properties of the compositions containing different concentrations of biuret were computed by using the NASA CEC-71 programme and the burning rate performances were evaluated. In addition, the sensitivity, thermal and mechanical properties of the compositions were also evaluated. The composition containing ammonium chlorate(VII) (AP) 65%, Al 15%, binder 20% and biuret 0-6% over the batch were prepared. The composition containing 6% biuret over the batch was insensitive to friction and impact. As the amount of biuret was increased, the energy, burning rate and sensitivity decreased, whilst the auto ignition temperature increased. The formulation containing 4% biuret over the batch was found to be the optimum with respect to energy, burning rate, pressure index, and sensitivity.

Źródło:

Central European Journal of Energetic Materials; 2014, 11, 1; 3-13
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 38.

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

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Skocz do pozycji: 39.

Tytuł:

Biosorption of aniline blue from aqueous solution using a novel biosorbent Zizyphus oenoplia seeds: Modeling studies

Autorzy:

Kumar, M.
Elangovan, G
Tamilarasan, R
Vijayakumar, G.
Mukeshkumar, P. C.
Sendhilnathan, S.

Powiązania:

https://bibliotekanauki.pl/articles/778750.pdf

Data publikacji:

2015

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

aniline blue
removal
biosorption
Zizyphus oenoplia seed
modeling

Opis:

This article presents the feasibility for the removal of Aniline Blue dye (AB dye) from aqueous solution using a low cost biosorbent material Zizyphus oenoplia seeds. In this study, a batch mode experiments of the adsorption process were carried out as a function of pH, contact time, concentration of dye, adsorbent dosage and temperature. The experimental data were fitted with Freundlich and Langmuir isotherm equations. The feasibility of the isotherm was evaluated with dimensionless separation factor (RL). The kinetic data of sorption process are evaluated by using pseudo-first order and pseudo-second order equations. The mode of diffusion process was evaluated with intra-particle diffusion model. The thermodynamic parameters like change in enthalpy (ΔHº); change in entropy (ΔSº) and Gibbs free energy change (ΔGº) were calculated using Van’t Hoff plot. The biosorbent material was characterized with Fourier Transform Infrared (FTIR) spectroscopy and the morphology was identified with Scanning Electron Microscope (SEM) in before and after adsorption of AB dye.

Źródło:

Polish Journal of Chemical Technology; 2015, 17, 3; 70-77
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 40.

Tytuł:

Dodonaea viscosa Linn used disease by Irula tribes Kanchipuram District Tamil Nadu, India

Autorzy:

Nandakumar, R.
Rajikannun, M.
Kalaiselvan, D.
Sirkanth, G.
Kumar, P.

Powiązania:

https://bibliotekanauki.pl/articles/1177761.pdf

Data publikacji:

2018

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Dodonaea viscosa
Irula tribes
traditional medicine

Opis:

India is known for its rich flora and fauna, diverse climatic areas and wealth of living ethno medicinal plant using the tradition. The paper enumerates medicinal plants used by Irula tribes Kanchipuram district, Tamil Nadu. The traditional practises of three medicinal plants belonging to three families are obtainable with botanical name, family, local name, parts used, method of groundwork and ethno pharmaceutical uses. Medicinal plants were the richest source of India with many traditional uses. Numerous of the pharmacological and pharmacognostical studies of the medicinal plants shown their active application in the field of medicine as they possess certain nutrient and non-nutrient substances that protects and precludes the body from many diseases. They attain a great helpfulness in the present world due to the side effects of the manmade drugs on the human life. Dodonaea viscosa Linn. is an evergreen woody perennial shrub with a native of Australia, indigenous and was later wide spread throughout the region of tropics. Various plant parts such as stem, leaves, seeds, roots, bark and aerial parts were used as the antibacterial, analgesic antiviral, anti-inflammatory, antiulcer and antioxidant agent in traditional system of medicine.

Źródło:

World Scientific News; 2018, 100; 99-109
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 41.

Tytuł:

An extended finite difference method for singular perturbation problems on a non-uniform mesh

Autorzy:

Swarnakar, D.
Kumar, V. Ganesh
Soujanya, G. B. S. L.

Powiązania:

https://bibliotekanauki.pl/articles/2174215.pdf

Data publikacji:

2022

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

siatka niejednorodna
metoda różnic skończonych
warstwa graniczna
non uniform grid
finite difference method
singular perturbation
boundary layer

Opis:

An extended second order finite difference method on a variable mesh is proposed for the solution of a singularly perturbed boundary value problem. A discrete equation is achieved on the non uniform mesh by extending the first and second order derivatives to the higher order finite differences. This equation is solved efficiently using a tridiagonal solver. The proposed method is analysed for convergence, and second order convergence is derived. Model examples are solved by the proposed scheme and compared with available methods in the literature to uphold the method.

Źródło:

International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 203--214
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 42.

Tytuł:

Studies on Aluminized, High Burning Rate, Butacene® Based, Composite Propellants

Autorzy:

Ghosh, K.
Behera, S.
Kumar, A.
Padale, B. G.
Deshpande, D. G.
Gupta, M.

Powiązania:

https://bibliotekanauki.pl/articles/358702.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

Butacene®
ferrocene
pressure exponent

Opis:

This paper reports on a Butacene® based composite propellant with high burning rate. The effect of replacing HTPB with Butacene® on the physical, mechanical and ballistic properties, and sensitivity towards impact and friction, has been studied. The ballistic properties were evaluated as burning rates at various pressures (7-11 MPa), pressure exponents, ignition temperatures etc. As expected, a remarkable enhancement in burning rate at low pressures was observed with increasing percentage of Butacene®. Comparatively lower n-values were observed for compositions containing Butacene® than for HTPB based propellants. The sensitivity of Butacene® based compositions, in terms of impact and friction, was found to be increased with an increasing percentage of Butacene®.

Źródło:

Central European Journal of Energetic Materials; 2014, 11, 3; 323-333
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 43.

Tytuł:

A report on occurrence of Neofusicoccum sp. in Carallia brachiata (Lour.) Merr. trees from Karnataka, India

Autorzy:

Muthu Kumar, A.
Pandey, A.K.
Mishra, G.
Rao, S.

Powiązania:

https://bibliotekanauki.pl/articles/11572.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Opis:

Carallia brachiata (Lour.) Merr. is one of the soft woody species occurring all along the Western Ghats region of Kundapura, Karnataka, India. The species is considered to be a potent medicinal plant exclusively used against itch and septic poisoning. A study was under gone based on the report of forest department (Karnataka) on mortality of Carallia brachiata. Observation of symptoms on the infected trees and experimental analysis of the samples under laboratory conditions revealed the incidence of Neofusicoccum sp., a first report on Carallia brachiata. This particular Neofusicoccum sp. belongs to Botryospaeriaceae family, and is considered to be an important fungal pathogen associated with tree decline in forest and plantation worldwide.

Źródło:

International Letters of Natural Sciences; 2015, 04
2300-9675

Pojawia się w:

International Letters of Natural Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 44.

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: 45.

Tytuł:

Characterization of weld fusion zone for TIG welded P91and P92 steels

Autorzy:

Pandey, C.
Mahapatra, M. M.
Kumar, P.
Thakare, J. G.

Powiązania:

https://bibliotekanauki.pl/articles/353653.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

P91
P92
fusion zone
microstructure
TIG

Opis:

The welding of nuclear grade P91 and P92 steel plate of thickness 5.2 mm were performed using the autogenous tungsten inert gas (TIG) welding process. The welded joint of P91 and P92 steel plate were subjected to the varying post weld heat-treatment (PWHT) including the post weld heat treatment (PWHT) and re-austenitizing based tempering (PWNT). A comparative study was performed related to the microstructure evolution in fusion zone (FZ) of both the welded joint using the scanning electron microscope and optical microscope in a different condition of heat treatment. The hardness test of the FZ for both joints was also conducted in a different condition of heat treatment. P92 steel welded joint have observed the higher tendency of the δ ferrite formation that led to the great variation in hardness of the P92 FZ. The homogeneous microstructure (absence of δ ferrite) and acceptable hardness was observed after the PWNT treatment for both the welded joint.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 4; 1755-1761
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Influence of Ceramic Particles on the Microstructure and Mechanical Properties of SAC305 Lead-Free Soldering Material

Autorzy:

Kumar, Manoj Pal
Gergely, G.
Koncz-Horvath, D.
Gacsi, Z.

Powiązania:

https://bibliotekanauki.pl/articles/356293.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

composite solder
SiC particles
microstructure
wettability
microhardness

Opis:

In this study, silicon carbide (SiC) reinforced lead-free solder (SAC305) was prepared by the powder metallurgy method. In this method SAC305 powder and SiC powder were milled, compressed and sintered to prepare composite solder. The composite solders were characterized by optical and scanning electron microscopy for the microstructural investigation and mechanical test. Addition of 1.5 wt.% and 2 wt.% ceramic reinforcement to the composite increased compressive strengths and microhardness up to 38% and 68% compared to those of the monolithic sample. In addition, the ceramic particles caused an up to 55% decrease in the wetting angle between the substrate and the composite solder and porosity was always increased with increase of SiC particles.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 2; 603-606
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Salt effect on the enthalpy of mixing of 2-propanol + acetic acid at 303.15 K

Autorzy:

Tamilarasan, R.
Baffna, S.G.
Anand-Prabu, A.
Dharmendira-Kumar, M.

Powiązania:

https://bibliotekanauki.pl/articles/778859.pdf

Data publikacji:

2009

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

entalpia
system binarny
efekt solny
2-propanol
kwas octowy
excess enthalpy
binary system
salt effect
acetic acid

Opis:

This paper presents the effect of two dissolved inorganic salts (zinc chloride, ZnCl2 and ammonium chloride, NH4Cl) on the enthalpy of mixing (HE) of 2-propanol + acetic acid binary system measured at 303.15 K using an isothermal displacement calorimeter with vapour space. A decreasing trend in the excess enthalpy of mixing values in the presence of ZnCl2 and NH4Cl indicate the endothermic behavior of this system. The Redlich-Kister equation has been used to fit the experimental HE data. The deviations from the ideal value and binary parameters were calculated and reported.

Źródło:

Polish Journal of Chemical Technology; 2009, 11, 4; 20-23
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Eight-Channel Optical Add Drop Multiplexer Based on Ring Resonator Using LNOI Channel Waveguides

Autorzy:

Kumar, H.
Janyani, V.
Buryy, O.
Ubizskii, S.
Sugak, D.
Singh, G.

Powiązania:

https://bibliotekanauki.pl/articles/1030850.pdf

Data publikacji:

2018-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

42.79.Sz

Opis:

In this paper we report on an eight-channel optical add drop multiplexer based on ring resonator using lithium niobate on insulator channel waveguides. It is suitable for a DWDM-GPON network with channel spacing of 100 GHz in C-band and data rate is 10 Gbps. The insertion loss at the drop port is maximum 1.2 dB and the Q-factor is 1636. It can be used as multiplexer as well as demultiplexer in 8-channel DWDM systems.

Źródło:

Acta Physica Polonica A; 2018, 133, 4; 997-999
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Utilization of Wallostonite/ Quasi Isotropic S2 Glass Fiber Doped in to Epoxy on Mechanical and Thermal Properties

Autorzy:

Reddy, D.M.
Rakesh, C.H.
Karthikeyan, N.
Kumar, M. A.
Nagaraju, G.

Powiązania:

https://bibliotekanauki.pl/articles/412223.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Epoxy
Wallostonite
S2 glass fiber
characterization
DSC
TGA

Opis:

Study focused on the performance of injection moulded short Wallostonite filler and chopped glass fiber reinforced hybrid epoxy composites. Results showed that hybridization of glass fiber and Wallostonite was found to be comparable to that of epoxy glass fiber composites. Analysis of fiber length distribution in the composite and fracture surface was performed to study fiber breakage fracture mechanism. The simultaneous compounding of epoxy with two fillers was done to obtain a hybrid composite. The mechanical properties of hybrid, injection molded, chopped glass fiber/ Wallostonite/epoxy composites have been investigated by considering the effect of hybridization by these two fillers. This system is expected to have considerable mechanical properties. It has been found that the tensile, flexural, and impact properties of the filled epoxy were higher than those of unfilled epoxy. The hybrid effects of the tensile strength and modulus were studied by the rule of hybrid mixtures (RoHM) using the values of single fiber composites.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2015, 40; 24-35
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Vibrational Spectroscopy of H_2O by Lie Algebraic Methods

Autorzy:

Karumuri, S.
Srinivas, G.
Sunil Babu, K.
Sundara Siva Kumar, V.
Hanumaiah, A.

Powiązania:

https://bibliotekanauki.pl/articles/1399490.pdf

Data publikacji:

2013-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

03.65.Fd
02.20.Sv
33.20.Ea

Opis:

An algebraic model of coupled anharmonic oscillators is introduced, capable of describing the stretching vibrations of medium-size molecules. This model is applied to the calculation of O-H vibrational modes of water molecules. In this paper, we have reported the stretching and bending vibrational energy levels of water molecule using the algebraic and density functional theory method. The results obtained by theoretical models show good agreement with the experimental values.

Źródło:

Acta Physica Polonica A; 2013, 124, 1; 3-5
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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