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    Wyświetlanie 1-46 z 46
    Tytuł:
    Integrability theorems for power series
    Autorzy:
    Ram, Babu
    Powiązania:
    https://bibliotekanauki.pl/articles/724103.pdf
    Data publikacji:
    1974
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Źródło:
    Colloquium Mathematicum; 1974, 31, 2; 293-299
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel Method for Calculation of Knee Deformation Angles in Clinical and Sport Biomechanics
    Autorzy:
    Haddas, Ram
    Powiązania:
    https://bibliotekanauki.pl/articles/1054895.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    Cutting Maneuver
    Joint Architecture
    Kinematic
    Knee Deformation
    Knee Injuries
    Orthopaedic Surgery
    Opis:
    Biomechanical analyses seek to improve understanding of the mechanisms of knee injury and to find ways to reduce knee injury incidence. Many clinical biomechanics researchers use a standard kinematic adopted from Newington Children’s Hospital. Biomechanical studies include the knee joint configurations, where joint architecture immutably constrains and guides movement outcomes. Investigators will default to reporting resultant joint deformation without considering the influence of joint architectural configurations on kinematic responses. The purpose of this study was to develop a new joint angular kinematic method that accounts for influence of dynamic joint architectural configuration on deformation values. Twenty subjects performed unloaded dynamic flexion/ extension and 45° cutting maneuver. The knee deformation angles obtained with the new method proposed were compared with the values that obtained using the standard method. One way repeated measurement ANOVA’s was used to compare knee deformation angles values from the standard method that uses a static trial and the new method that uses a dynamic trial. The proposed method distinguishes between dynamic joint architectural configuration and joint deformation. Loaded standard abduction/adduction (β) and rotation (γ) angles were 3.4 ±1.8° and 11.2 ±3.8°, respectively. Using the new method, the β and γ angles decrease to 1.5 ±1.4° (<0.05) and 7.1 ±1.8° (<0.05) during cutting. The new method accounted for dynamic joint architectural configuration produced loaded β and γ angles that had smaller magnitudes than the standard method, suggesting that previous studies may have overestimated β and γ angles. Injury management strategies could be influenced by a consideration for dynamic joint architectural configuration. Such a consideration could influence ligament repair strategies. Future studies should account for dynamic configuration when establishing the influence of joint deformation on graft design and appropriate isometry values during reconstruction.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2016, 13, 1; 5-13
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fiscal Performance Benchmarking of Indian States - A Robust Frontier Approach
    Benchmarking kondycji fiskalnej indyjskich stanów – podejście oparte na odporności granicy
    Autorzy:
    Pratap, Sinha, Ram
    Powiązania:
    https://bibliotekanauki.pl/articles/694401.pdf
    Data publikacji:
    2017
    Wydawca:
    Wyższa Szkoła Bankowa we Wrocławiu
    Opis:
    Aim: The objective of the paper is to construct an index of fiscal performance of Indian states using four non-parametric approaches ( Data Envelopment Analysis(DEA), Free Disposal Hull(FDH), Order-m and Order-alpha).The reason behind using non-parametric methods for the purpose of construction of index is that the traditional ratio approach is incapable of handling multiple input and output indicators.Research methods: The present study uses a two stage approach. In the first stage, four non-parametric methods have been used to evaluate the performance of Indian states for five consecutive years. The input and output indicators have been selected on the basis of a simple theoretical model. Further, in order to tackle the problem of estimation bias (due to sampling variations) bootstrapped DEA and bootstrapped Order-m methods have been applied. In the second stage ,impact of indebtedness on the performance of the states has been assessed using a censored regression framework.Findings: The major outcome of the study is the construction of a fiscal performance index based on multiple indicators. Moreover, the second stage results indicate that state performance is significantly influenced by their degree of indebtedness.Originality/Value of the article: The present study is perhaps the first attempt to assess the performance of sub-national units in terms of both convex and non-convex mathematical programming methods.Implications of the research : The approach (with suitable  modifications) can be effectively used to benchmark state performance which can serve as a basis for resource transfer from the central government to the states.
    Cel: Artykuł ma na celu skonstruowanie indeksu kondycji fiskalnej indyjskich stanów w oparciu o metodę DEA. Uzasadnieniem wykorzystania metod nieparametrycznych w celu opracowania indeksu jest niezdolność tradycyjnego podejścia współczynnikowego do uwzględnienia wskaźników wielokrotnych nakładów i wyników. Metodyka badań: Badanie oparto na dwuetapowym podejściu. W pierwszym etapie wykorzystano metodę DEA do oceny kondycji indyjskich stanów w pięciu kolejnych latach. Wskaźniki nakładów i wyników użyte w DEA ostały wybrane na podstawie prostego modelu teoretycznego. Następnie, aby rozwiązać problem błędu szacunkowego (ze względu na wariacje doboru próby), zastosowano samoczynną DEA. W drugim etapie oceniono wpływ zadłużenia na kondycję stanów, wykorzystując cenzurowane modele regresji. Wnioski: The major outcome of the study is the construction of a fiscal performance index based on multiple indicators. Moreover, the second stage results indicate that state performance is significantly influenced by their degree of indebtedness. Wartość artykułu: Głównym wynikiem badań jest opracowanie indeksu kondycji fiskalnej opartym na wielokrotnych wskaźnikach. Co więcej, wyniki z drugiego etapu badań wskazują, że kondycja stanów znajduje się pod istotnym oddziaływaniem stopnia ich zadłużenia. Ograniczenia: Niniejsze badanie to prawdopodobnie pierwsza próba oceny kondycji jednostek subnarodowych pod względem zarówno wypukłych, jak i niewypukłych metod programowania matematycznego. Implikacje: Zaprezentowane podejście (z odpowiednimi modyfikacjami) może być z powodzeniem stosowane do benchmarkingu kondycji stanów, co może służyć jako podstawa transferu zasobów od rządu centralnego do stanów.
    Źródło:
    Central European Review of Economics and Management; 2017, 1, 4; 225-249
    2543-9472
    Pojawia się w:
    Central European Review of Economics and Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Indebtedness, Fiscal Discipline and Development Spending – A Non-parametric Approach
    Autorzy:
    Sinha, Ram Pratap
    Powiązania:
    https://bibliotekanauki.pl/articles/2075409.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Indian states
    fiscal performance
    efficiency
    data envelopment analysis
    bootstrap
    Opis:
    Indian states exhibit considerable heterogeneity in terms of revenue mobilizing capacities and efforts, development spending and fiscal dependence on the central government. In this context, the paper compares the fiscal performance of major Indian states in terms of two non-parametric performance evaluation models for the period 2009–10 to 2014–15. The study thus uses the conventional two stage framework for efficiency evaluation as well as the two stage conditional performance model. The outcomes enable us to identify front-runners as well as laggards in the area of fiscal management. Further, the study showed that the gross capital formation experienced by the states significantly influences state performance in India. However, the impact of outstanding liabilities on efficiency performance was statistically insignificant
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2021, 2; 147-173
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical modeling of short pulsed laser irradiation in the cornea: a dual phase lag model
    Autorzy:
    Autar, Ram
    Kumar, Anuj
    Powiązania:
    https://bibliotekanauki.pl/articles/1839838.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    temperature
    laser
    cornea
    refractive error
    Laser Thermo Keratoplasty
    LTK
    Laplace transformation technique
    dual phase lag equation
    temperatura
    rogówka
    termokeratoplastyka
    refrakcja oka
    Opis:
    A simple mathematical model for the temperature evolution in the cornea exposed to short-pulsed Ho: YAG laser under Laser Thermo Keratoplasty (LTK) treatment is developed by incorporating both the heat flux phase-lag and temperature gradient phase-lag in Fourier’s heat transfer model. An analytical solution to the mathematical model is obtained using the Laplace transformation technique. The computational results for the temperature profile and the temperature variation with time are presented through the graphs. The effect of some typical parameters: the heat flux phase-lag and the temperature gradient phase-lag on the temperature distribution and temperature variations are illustrated and discussed.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 3; 5-16
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Anticoagulant Dabigatran by Analytical Instrumentation
    Autorzy:
    Patel, B.
    Ram, P.
    Khatri, T.
    Ram, V
    Dave, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/412564.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Dabigatran
    UPLC/MS/MS
    zeta potential
    FTIR
    UV-NIR
    Thermal analysis
    Opis:
    Dabigatran with IUPAC name 3-({2-[(4-Carbamimidoyl-phenylamino)-methyl]-1-methyl-1H-benzoimidazole-5-carbonyl}-pyridin-2-yl-amino)-propionic acid, which can be used to prevent strokes in those with atrial fibrillation due to causes other than heart valve disease, and at least one additional risk factor for stroke (congestive heart failure, hypertension, age, diabetes, and prior stroke), with molecular formula C34H41N7H5 was studied in detail for functional group analysis with FTIR, characteristic absorbance by UV-NIR, thermal behavior by TGA-DTA-DSC, particle size and stability of the molecule with Nano particle size analyzer. The structure was confirmed by LC-MS/MS with ESI probe and mass was found in aggregation with the reported standard values. The purity of drug was determined by Prep. HPLC analysis. FTIR analysis showed the characteristic peak of carboxylic acid, UV-NIR analysis showed that the λmax was 224 nm with methanol as a diluent, the compound was found stable in the thermal analysis, the average particle size was found to be 25.2 nm, Z-average as 0.2 nm and zeta potential as -67.6 mv hence showed excellent stability in the zeta potential analysis as per ASTM standards D4187-82, American Society of Testing and Materials, 1985.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 11, 3; 233-242
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frequency magnitude distribution and spatial correlation dimension of earthquakes in north-east Himalaya and adjacent regions
    Autorzy:
    Tiwari, Ram Krishna
    Paudyal, Harihar
    Powiązania:
    https://bibliotekanauki.pl/articles/2204361.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    north-east India
    b value
    maximum likelihood estimation
    correlation dimension
    Indie północno-wschodnie
    parametr b
    największa wiarygodność
    estymacja
    wymiar korelacyjny
    Opis:
    The north-east sector of the Himalaya is one of the most active tectonic belts, with complex geological and tectonic features. The b-value and spatial correlation dimension (Dc) of earthquake distribution in the north-east Himalaya and its adjacent regions (20–32°N and 88–98°E) are estimated in the present study. Based on seismicity and faulting pattern, the region is divided into five active regions, namely the (i) South-Tibet, (ii) Eastern-Syntaxis, (iii) Himalayan-Frontal Arc, (iv) Arakan-Yoma belt and (v) Shillong-Plateau. A homogeneous catalogue of 1,416 earthquakes (mb ≥ 4.5) has been prepared from a revised catalogue of the ISC (International Seismological Centre). The b-value has been appraised by the maximum likelihood estimation method, while Dc values have been calculated by the correlation integral meth-od; b-values of 1.08 ± 0.09, 1.13 ± 0.05, 0.92 ± 0.05, 1.00 ± 0.03 and 0.98 ± 0.08 have been computed for the South-Tibet, Eastern-Syntaxis, Himalayan-Frontal Arc, Arakan-Yoma belt and Shillong-Plateau region, respectively. The Dc values computed for the respective regions are 1.36 ± 0.02, 1.74 ± 0.04, 1.57 ± 0.01, 1.8 ± 0.01, and 1.83 ± 0.02. These values are > 1.5, except for the South-Tibet (1.36 ± 0.02). The b-values around the global average value (1.0) reflect the stress level and seismic activity of the regions, while high Dc values refer to the heterogeneity of the seismogenic sources.
    Źródło:
    Geologos; 2022, 28, 2; 115--128
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cyanobacterial diversity from seven mangrove environments of Kerala, India
    Autorzy:
    Ram, Arun T.
    Shamina, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1118360.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Mangroves
    biodiversity
    marine cyanobacteria
    Opis:
    A survey on the cyanobacterial biodiversity of 7 mangrove environments viz. Vallikunnu, Kadalundi, Kallayi, Mangalavanam, Kumbalam, Kumarakom and Mekkara mangroves of Kerala was undertaken during 2014-2016. In total, 31 species of cyanobacteria coming under 10 genera and 4 families were recorded in all mangrove environments. Maximum species (13 species) of cyanobacteria were recorded from Kadalundi, whereas the minimum was recorded from Mangalavanam (2 species). The genus Oscillatoria was observed with maximum distribution (13 species), followed by Nostoc (5 species) and Lyngbya (3 species). The genus Aphanocapsa, Microcoleus and Scytonema (2 species each) and Chroococcus, Aphanothece, Merismopedia, and Phormidium (1 species each) shows equal distribution. As many as three species, namely Oscillatoria salina, Oscillatoria ornata and Oscillatoria vizagapatensis were common in all mangrove environments except Mangalavanam and Mekkara.
    Źródło:
    World News of Natural Sciences; 2017, 9; 91-97
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Software reliability growth modeling for agile software development
    Autorzy:
    Rawat, S.
    Goyal, N.
    Ram, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/329876.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    software reliability
    nonhomogeneous poison process
    transient faults
    permanent faults
    Musa model
    niezawodność oprogramowania
    błąd przejściowy
    zwarcie trwałe
    Opis:
    The frequent incremental release of software in agile development impacts the overall reliability of the product. In this paper, we propose a generic software reliability model for the agile process, taking permanent and transient faults into consideration. The proposed model is implemented using the NHPP (non-homogenous Poisson process) and the Musa model. The comparison of the two implementations yields an effective, empirical and reliable model for agile software development.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2017, 27, 4; 777-783
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Gender and Recurrent Low Back Pain on Lifting Style
    Autorzy:
    Haddas, Ram
    Yang, James
    Sizer, Philip
    Powiązania:
    https://bibliotekanauki.pl/articles/1054732.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    clinical biomechanics
    injury prevention
    lifting
    low back pain
    Opis:
    Objective: The purpose of this study was to examine the influence of gender and existing, recurrent low back pain (rLBP) on lower extremity and trunk mechanics, as well as neuromuscular control, during a lift task. Design: A multivariate design was used to examine the effects of gender and group on biomechanical and neuromuscular control variables in randomized symmetric and asymmetric lifting. Methods: 68 Males and females with rLBP and healthy performed symmetric and asymmetric weighted box lifting trials to a 1 meter height table. Results: Lifting style was different between gender and between the rLBP versus healthy groups during a 1m box lifting. A significant two-way interaction effect between gender and group was observed for multifidus muscle activity and knee rotation in asymmetric lifting. Several gender and group main effects were observed in pelvis obliquity, trunk flexion and side flexion, knee abduction angles in symmetric lifting; and in pelvis obliquity and rotation, trunk flexion and side flexion, hip abduction, knee abduction angles, external oblique and internal oblique muscles activity in asymmetric lifting. Conclusions: Females and individuals with rLBP appear to use different lifting styles that emphasize movement at the pelvis accompanied by poor kinematic control features at the hip, trunk and knee. Clinicians should be mindful of these changes when developing prevention and rehabilitation programs aimed at improving trunk control in preparation for lifting tasks during domestic and occupational activities.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2015, 11, 3; 15-28
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical Model of Oxygen Transport in Cornea
    Autorzy:
    Avtar, Ram
    Seth, Deepti
    Kumar, Aadesh
    Powiązania:
    https://bibliotekanauki.pl/articles/1159714.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Crank-Nicoloson method
    Michaelis-Menten kinetics
    Oxygentransport
    Thomas algorithm
    finite difference
    metabolism
    oxygen consumption
    pressure gradient
    Opis:
    The aim of present work is the development of a quasi-steady state model for the time course concentration profile describing the oxygen diffusion and consumption in a multilayered corneal tissue and investigation of the effect of various model parameters on the oxygen concentration for open and closed eyes. A simple mathematical model for the oxygen transport in multilayered corneal tissue was developed using Fick’s law of diffusion, Michaelis-Menten kinetics of metabolism. A Crank-Nicolson finite difference scheme of the equation describing the oxygen diffusion and consumption was written, in which spatial diffusive terms of the equation were approximated by central differences while the temporal terms were approximated by average of forward and backward time differences. A system of linear equations obtained from the Crank-Nicholson finite differences schemes was solved by the Thomas Algorithm in which successive improve approximate results are obtained.
    Źródło:
    World Scientific News; 2018, 113; 169-184
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XRF analysis of Pongamia pinnata stem of semi arid region of Kachchh
    Autorzy:
    Ram, V.R.
    Patel, M.G.
    Ram, P.N.
    Khatri, T.T.
    Dave, P.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/11000.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    The objective of the present investigation was to study the chemical composition of stem of Pongamia pinnata is a species of tree native to India growing in semi-arid region of Kachchh district, Gujarat, India. The stem of Pongamia pinnata were subjected to Energy Dispersive X-ray Fluorescence (EDXRF) and were analyzed for different mineral composition. As the X-ray Fluorescence is one of the most reliable and accurate, as well as it is also a consistent and nondestructive method for analysis of major and trace elements using a single pressed pellet. During the study it was found that Potassium, Chloride, Calcium, Silicon, Sulfur, Aluminum, Phosphorus were noted in higher amounts, compared to that of other elements like Manganese, Iron, Nickel, Copper, Zink, Bromide, Rubidium, Strontium, Stannous, whereas the elements which were not detected in stem of Pongamia pinnata are Titanium, Cobalt, Hafnium and Tantalum.
    Źródło:
    International Letters of Natural Sciences; 2015, 40
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal analytical characteristics by TGA-DTA-DSC analysis of Carica papaya leaves from Kachchh
    Autorzy:
    Ram, V.R.
    Ram, P.N.
    Khatri, T.T.
    Vyas, S.J.
    Dave, P.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/11265.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    An experimental study on Carica papaya leaves was carried out in Thermo gravimetric analyzer (TGA), Differential Thermal Analyzer (DTA) and Differential Scanning Calorimetric (DSC) analyzer to investigate the effects of reaction atmosphere on thermal chemical characteristics. Experimental results show that In DSC curve, Endothermic peak at 101 °C is attributed to dehydration/Water loss from surface and pores of the powder sample. Step at 215 °C is associated with second order phase transition such as Glass Transition and it should be further confirmed in second heating (During heat- cool- heat cycle). Endothermic peak at 336 °C is associated protease thermal decomposition /Beta Cyclodextrin breakdown. In the TGA Curve, The initial 4 % weight loss is due to water loss from surface/pores of powder sample. Second weight loss between 200-450 °C is associated to degradation of cellulose and hemicellulose.
    Źródło:
    International Letters of Natural Sciences; 2014, 21
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XRF analysis of Carica papaya leaves of semi arid region of Kachchh
    Autorzy:
    Ram, P.N.
    Ram, V.R.
    Khatri, T.T.
    Vyas, S.J.
    Dave, P.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/11682.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Cutch zob.Kachchh
    Kachh zob.Kachchh
    India
    X-ray fluorescence
    Carica papaya
    Caricaceae
    leaf
    chemical composition
    semi-arid zone
    Kachchh
    Kutch zob.Kachchh
    Opis:
    The objective of the present investigation was to study the chemical composition of leaves of Carica papaya belonging to family Caricaceae growing in semi-arid region of Kachchh district, Gujarat, India. The leaves of C. papaya were subjected to Energy Dispersive X-ray Fluorescence (EDXRF) and were analyzed for different mineral composition. As the X-ray Fluorescence is one of the most reliable and accurate, as well as it is also a consistent and non-destructive method for analysis of major and trace elements using a single pressed pellet. During the study it was found that Oxygen, Calcium, Magnessium, Potassium were noted in higher amounts, compared to that of other elements like Silicon, Sulphur, Phosphorus, Chloride, Strontium, Stanous, Aluminium, Cromium and Mangenese, whereas the elements which were not detected in leaves of C. papaya are Vanadium, Titanium, Cobalt and Tantalum.
    Źródło:
    International Letters of Natural Sciences; 2014, 19
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Markovian Epidemic Queueing Model with Exposed, Infection and Vaccination based on Treatment
    Autorzy:
    Singh, Ram
    Preeti, Preeti
    Raina, Ather Aziz
    Powiązania:
    https://bibliotekanauki.pl/articles/1166188.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Epidemic Model
    Infection
    Markov model
    Runge kutta method
    Vaccination
    Opis:
    In this investigation, an epidemic Markov queueing model with alert, infection, vaccination and death has been considered. The main focus of this work is on the vaccination to provide the infection in a population. Healthy person may be affected from some disease that may cause death. The vaccination is the power tool for the prevention of the diseases spreading over the population size. Healthy person become alert when symptoms of the disease can be seen on them and the alert may be injected due to more infection. The provision of vaccination is provided in both alert and infected stages. The transition rates as followed by exponential distribution. A Markov model is developed by using inflow and outflow transition rates of the model. The transient state probabilities are evaluated by solving the transient state equations by using runge kutta method which are further used for calculating the model performances. A numerical illustration is also provided to validate the model.
    Źródło:
    World Scientific News; 2018, 106; 141-150
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On weakly symmetric generalized trans-sasakian manifold
    Autorzy:
    Das, Levejoy S.
    Nivas, Ram
    Agnihotri, Rupali
    Powiązania:
    https://bibliotekanauki.pl/articles/1912861.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    Trans-Sasakian manifold
    weakly symmetric
    Riemannian manifold
    curvature tensor
    Opis:
    In this paper, we have defined the weakly symmetric generalized Trans-Sasakian manifold \(G(WS)_n\) and it has been shown that on such manifold if any two of the vector fields \(\lambda,\gamma,\tau\), defined by equation (0.3) are orthogonal to \(\xi\), then the third will also be orthogonal to \(\xi\). We have also proved that the scalar curvature \(r\) of weakly symmetric generalized Trans-Sasakian manifold \(G(WS)_n\), \((n > 2)\) satisfies the equation \(r = 2n(\alpha^2 − \beta^2)\), where \(\alpha\) and \(\beta\) are smooth function and \(\gamma\not=\tau\).
    Źródło:
    Commentationes Mathematicae; 2014, 54, 1
    0373-8299
    Pojawia się w:
    Commentationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Mechanical and Electrical Properties of Spark Plasma Sintered Titanium Carbide Reinforced Alumina Ceramic Composite
    Autorzy:
    Selvakumar, G.
    Prakash, S. Ram
    Rajkumar, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049356.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Spark Plasma Sintering
    alumina composite
    TiC
    mechanical properties
    fracture toughness
    Opis:
    Spark Plasma Sintering (SPS) is identified as a suitable technique to prepare the alumina titanium carbide composite to overcome the difficulty in fabricating it through other consolidation method. The present work focuses on the fabrication and characterization of a series of titanium carbide reinforced alumina ceramic composites using a spark plasma sintering process. The titanium carbide reinforcement on the alumina matrix is varied between 20 and 35 wt.%, in order to improve the electrical conductivity and fracture toughness of the composites. The particle size of the starting powders at received and ball milled conditions was analysed through Particle size analyser and Scanning Electron Microscope (SEM). Microstructural analysis revealed that the TiC reinforcement is uniformly dispersed in the sintered composite. XRD report showed that α-alumina and titanium carbide were the two dominant phases without the formation of any reaction phases. Further, the correlation between mechanical and physical properties of the prepared composite was investigated as a function of TiC. Various fracture toughening indicators like crack deflection, bridging and branching were analysed by Vicker’s indentation method. Electrical resistivity of the sintered compact decreases proportionally with the increase in titanium carbide constituents. Maximum density (98.80%) and hardness (20.56 GPa) was obtained for 30 wt. % reinforced composite. Almost 40% improvement in fracture toughness is noted for 25 wt. % reinforced composite. This work demonstrates the synthesis and fabrication of alumina titanium carbide composites at low temperature via SPS resulted in obtaining an intact compact with improved mechanical and electrical properties.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 831-838
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Anticonvulsant Clobazam Drug by Sophisticated Instrumentation
    Autorzy:
    Bhogayta, J.
    Khatri, T.
    Ram, V.
    Dave, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/412463.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    clobazam
    anticonvulsant drug
    cyclic amide
    benzodiazepine
    Opis:
    Clobazam (7-Chloro-1-methyl-5-phenyl-1,5-benzodiazepine-2,4(3H)-dione) an anticonvulsant drug used since 1984, with molecular formula C16H13ClN2O2 and molecular mass 300, was characterized with sophisticated instruments like FTIR, UV-NIR, GC-MS, TGA-DTA-DSC and Nano particle size analyzer with zeta potential. The compound was confirmed with the help of GC-MS and the mass of sample was found aggregate with the standard values and mass spectra compare with NIST and WELEY library data. The UV-NIR analysis showed that the λmax was 231 nm with methanol as a diluent. FTIR analysis of the Clobazam gave the characteristics peaks of cyclic amide. HPTLC was used to determine the purity of the drug. Thermal behavior was studied with TGA-DTA-DSC analysis. The particle size of clobazam was measured with the Nano particle size analyzer and Zeta potential of drud found -77.0 mV. The purity of drug check with Preparative HPLC system.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 10; 1-13
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Upper Bounds for the Complex Growth Rate of a Disturbance in Ferrothermohaline Convection
    Autorzy:
    Ram, Kaka
    Prakash, Jyoti
    Kumari, Kultaran
    Kumar, Pankaj
    Powiązania:
    https://bibliotekanauki.pl/articles/2086773.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    linear stability
    ferrofluid
    oscillatory motions
    ferrothermohaline convection
    Opis:
    It is proved analytically that the complex growth rate σ= σr+iσi (σr and σi are the real and imaginary parts of σ, respectively) of an arbitrary oscillatory motion of neutral or growing amplitude in ferrothermohaline convection in a ferrofluid layer for the case of free boundaries is located inside a semicircle in the right half of the σrσi-plane, whose center is at the origin (formula) where Rs is the concentration Rayleigh number, Pr′ is the solutal Prandtl number, M1′ is the ratio of magnetic flux due to concentration fluctuation to the gravitational force, and M5 is the ratio of concentration effect on magnetic field to pyromagnetic coefficient. Further, bounds for the case of rigid boundaries are also derived separately.
    Źródło:
    Studia Geotechnica et Mechanica; 2022, 44, 2; 114--122
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic pricing policy in a growing market for a deteriorating product
    Autorzy:
    Khedlekar, Uttam Kumar
    Tiwari, Ram Kumar
    Tiwari, Ramkrishna
    Powiązania:
    https://bibliotekanauki.pl/articles/2050065.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    inventory
    dynamic pricing
    quadratic demand
    optimal price settings
    deterioration
    Opis:
    In this paper, we suggest an optimal pricing policy in a growing market for a deteriorating product. Here, the demand rate is considered as a function of selling price, time and stock level. When the product is introduced into the market, the demand for the product increases slowly according to the performance of the product and depending on market conditions. In maturity stage, the demand is gradually increasing and hence the need arises of developing a pricing policy in a growing market. This paper proves that there exists an optimal increasing-price policy, especially in a growing market for a product. The final recommendations are made based on a sensitivity analysis.
    Źródło:
    Control and Cybernetics; 2020, 49, 3; 333-349
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of temperature of black holes in terms of Chandrasekhar limit
    Autorzy:
    Mahto, D.
    Jha, B. K.
    Singh, K.M.
    Ram, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412044.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    black holes
    formula for the temperature
    Hawking
    Einstein
    Opis:
    Stephen Hawking gave the formula for the temperature for the black holes as[wzór] . In the present research article, we have converted this formula in terms of Chandrasekhar limit [Mch] and also calculated their values for different test black holes existing in XRBs and AGN. [wzór] Kelvin.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2015, 40; 43-50
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shot peening effects on fatigue life, corrosion behavior and surface roughness of low carbon alloy steel
    Autorzy:
    Selva Senthil Prabhu, C.
    Ashoka Varthanan, P.
    Ram Kumar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086823.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface roughness
    shot peening
    fatigue life
    chropowatość powierzchni
    śrutowanie
    trwałość zmęczeniowa
    Opis:
    In this present study, the effect of the shot peening process on fatigue life, surface hardness and corrosion properties of a low carbon alloy steel is examined at room temperature. The research article addresses the effect of shot peening by varying the process parameters such as peening distance and pressure with amachrome as shots. The experiment is designed by means of full factorial design. The experimental result reveals that the pressure and distance are the most significant factors in the shot peening process. The results illustrate that the average pressure of 7 bar and distance of 100 mm improves fatigue life by 1.5% of unpeened material under 20 Hz frequency while corrosion resistance improves by 4% with unpeening of the low carbon alloy steel by using amachrome as a shot.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136214, 1--7
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shot peening effects on fatigue life, corrosion behavior and surface roughness of low carbon alloy steel
    Autorzy:
    Selva Senthil Prabhu, C.
    Ashoka Varthanan, P.
    Ram Kumar, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2090715.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface roughness
    shot peening
    fatigue life
    chropowatość powierzchni
    śrutowanie
    życie zmęczeniowe
    Opis:
    In this present study, the effect of the shot peening process on fatigue life, surface hardness and corrosion properties of a low carbon alloy steel is examined at room temperature. The research article addresses the effect of shot peening by varying the process parameters such as peening distance and pressure with amachrome as shots. The experiment is designed by means of full factorial design. The experimental result reveals that the pressure and distance are the most significant factors in the shot peening process. The results illustrate that the average pressure of 7 bar and distance of 100 mm improves fatigue life by 1.5% of unpeened material under 20 Hz frequency while corrosion resistance improves by 4% with unpeening of the low carbon alloy steel by using amachrome as a shot.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136214, 1--7
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computational predictive mutagenicity of similar chemicals for anthraquinone, β-sitosterol and quercetin found in Alternanthera tenella by using QSAR modeling software
    Autorzy:
    Haque, Mahmudul
    Bhakat, Ram Kumar
    Bhattacharjee, Aloke
    Talapatra, Soumendra Nath
    Powiązania:
    https://bibliotekanauki.pl/articles/1182926.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Allelopathy; Allelochemicals; Alternanthera tenella; Invasive species; Terrestrial ecosystem; Predictive Ames mutagenicity; QSAR modeling; T.E.S.T. software
    Opis:
    The present study aims to evaluate the mutagenic potential of secondary metabolites viz. anthraquinone, β-sitosterol and quercetin present in Alternanthera tenella and their related analogus compounds similar in their molecular structure. Nine similar putative allelochemicals analogus to each of anthraquninone, β-sitosterol and quercetin respectively were selected, a total of twenty seven similar chemicals were studied for mutagenicity prediction. Ames mutagenicity prediction was carried out by using T.E.S.T. (Toxicity Estimation Software Tool) of USEPA. All experimental metadata were obtained from Toxicity Benchmark and T.E.S.T. The results clearly indicated that the allelochemicals, anthraquinone and its related eight compounds were mutagenic positive except benzanthrone (mutagenic negative) but all experimental data were found mutagenic positive. β-sitosterol showed mutagenic negative in both experimental and predicted value. It’s three related compounds were mutagenic positive but rest six related compounds mutagenic negative in predicted value while in experimental data, seven compounds were found mutagenic positive and rest two mutagenic negative. In case of quercetin, both data were obtained mutagenic positive while in related compounds, seven compounds were found to be mutagenic positive and two compounds mutagenic negative in predicted value. All were found to be mutagenic positive in experimental metadata. Such findings poses a curiosity that are there any possibilities of conversion or substitution in the position of aromatic ring of allelochemicals when present in soil? Because allelopathy depends upon several environmental stressors and mutagenicity may be induced by allelochemicals. It is suggesting for future research to detect metabolic pathway and mechanism of allelochemicals formation in A. tenella in presence of toxins in soil and to validate with other available 2D and 3D softwares.
    Źródło:
    World Scientific News; 2016, 49, 2; 162-191
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation stability of 125I-brachytherapy sources
    Autorzy:
    Saxena, S.
    Ram, R.
    Dash, A.
    Joshi, P.
    Venkatesh, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148254.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    retinoblastoma
    125 I-brachytherapy sources
    radiation stability
    SEM
    leach rate
    Opis:
    Low energy 125I-brachytherapy sources are used for the treatment of retinoblastoma and many other forms of eye cancer. Such sources were prepared by adsorption of 125I on palladium coated silver rods and were critically evaluated for safety aspects, as per AERB standards. In order to attain low leachability and to facilitate leak free laser encapsulation of sources within titanium capsules of size 0.8 mm (f) ´ 4.75 mm (l), the radioactive source core was coated with polystyrene. With a view to study the radiation stability of such sources over a period of three weeks, both polymer coated radioactive sources and inactive source cores were separately subjected to an integrated gamma dose of ~(17.85 ´ 104) Gy (17.85 MRad), which is the dose expected to be received in three weeks from a source containing ~ 111 MBq of 125I. This was carried out to test their suitability for reuse within such period. SEM pictures of inactive source cores were taken to observe the effect of gamma radiation on palladium coating. Post-irradiation leachability and uniformity of activity of radioactive sources were evaluated and found to be satisfactory. The sources were found to be reusable safely, for repeated brachytherapy procedures over a practically useful time of at least three weeks.
    Źródło:
    Nukleonika; 2007, 52, 1; 13-16
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neural network-based allocation and self-improved firefly-based optimal sizing of fuel cells in distributed generation systems
    Autorzy:
    Subramanyam, T. C.
    Tulasi Ram, S. S.
    Subrahmanyam, J. B. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839111.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    DG system
    fuel cells
    location
    sizing
    multiple objectives
    firefly algorithm
    self-improved firefly algorithm
    Opis:
    The notion of Distributed Generation (DG) refers to the production of power at the level of consumption. Production of energy on-site, instead of offering it centrally, reduces the cost, internal dependencies, difficulties, inefficiencies, and risks that are related to transmission and distribution systems. In case DG is realized with fuel cells, several issues exist in respect to allocating and sizing of these fuel cells in the system. For solving those issues, dual stage intelligent technique is employed in this paper. First, the Neural Networks (NN) technique is adopted for determining the required location to place the fuel cells. Secondly, an enhanced version of Self Improved Fire-Fly (SIFF) algorithm is adopted for finding the optimal size of the fuel cells. The implemented technique is simulated in four IEEE benchmark test bus systems, and the respective performance analysis along with statistical analysis serves for validation purposes. The here proposed technique is compared with six other known algorithms, namely Particle Swarm Optimization (PSO), Firefly (FF) algorithm, Artificial Bee colony (ABC) algorithm, Improved Artificial Bee colony algorithm (IABC), Genetic Algorithm (GA) and Global Search Optimizer (GSO). The results obtained from the comparative analysis show the enhanced performance of the proposed mechanism.
    Źródło:
    Control and Cybernetics; 2018, 47, 4; 357-381
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Agri-Food 4.0 and Innovations: Revamping the Supply Chain Operations
    Autorzy:
    Dadi, Vasavi
    Nikhil, Suryadevara Ram
    Mor, Rahul S.
    Agarwal, Tripti
    Arora, Sapna
    Powiązania:
    https://bibliotekanauki.pl/articles/1839538.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    technologie cyfrowe
    przemysł rolno-spożywczy
    innowacje
    sztuczna inteligencja
    internet przedmiotów
    digital technologies
    agri-food industry
    innovations
    artificial intelligence AI
    internet-of-things (IoT)
    Opis:
    The agri-food sector contributes significantly to economic and social advancements globally despite numerous challenges such as food safety and security, demand and supply gaps, product quality, traceability, etc. Digital technologies offer effective and sustainable ways to these challenges through reduced human interference and improved data-accuracy. Innovations led by digital transformations in the agri-food supply chains (AFSCs) are the main aim of 'Agri-Food 4.0'. This brings significant transformations in the agri-food sector by reducing food wastage, real-time product monitoring, reducing scalability issues, etc. This paper presents a systematic review of the innovations in the agri-food for digital technologies such as internet-of-things, artificial intelligence, big data, RFID, robotics, blockchain technology, etc. The employment of these technologies from the ‘farm to fork’ along AFSC emphasizes a review of 159 articles solicited from different sources. This paper also highlights digitization in developing smart, sensible, and sustainable agri-food supply chain systems.
    Źródło:
    Production Engineering Archives; 2021, 27, 2; 75-89
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semiconductor Superlattices with Small Band Offsets - feature article
    Autorzy:
    Yang, G.
    Lewandowski, L. A.
    Furdyna, J. K.
    Ram-Mohan, L. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968871.pdf
    Data publikacji:
    1998-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.-w
    Opis:
    Optical transitions in small band offset superlattices are studied within the framework of the nearly free electron approximation, in which the weak superlattice potential is treated as a perturbation. Interband selection rules are derived for transitions involving conduction and valence band states at the superlattice Brillouin zone center and the zone edge. It is found that a number of new transitions can occur in such small-offset superlattices due to wave function mixing of different subband states. The effect of the effective mass on the optical transitions is also discussed. The theory is used to explain the results observed in magneto-optical absorption experiment in ZnSe/Zn$\text{}_{1-x}$Mn$\text{}_{x}$Se small-offset superlattices. Furthermore, the nearly free electron formulation is found to be in excellent agreement with rigorous multi-band numerical calculation on superlattices involving small band offsets.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 4; 567-600
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Real-time validation of an automatic generation control system considering HPA-ISE with crow search algorithm optimized cascade FOPDN-FOPIDN controller
    Autorzy:
    Babu, Naladi Ram
    Chiranjeevi, Tirumalasetty
    Devarapalli, Ramesh
    Knypiński, Łukasz
    Garcìa Màrquez, Fausto Pedro
    Powiązania:
    https://bibliotekanauki.pl/articles/27312009.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    crow search algorithm
    dish-stirling solar system
    AGC
    RT Lab
    FOPDN-FOPIDN controller
    Opis:
    This article validates the application of RT-Lab for the AGC studies of three-area systems. All the areas are employed with thermal-DSTS systems. A new controller named cascade FOPDN-FOPPIDN is employed. Its parameters are optimized using a CSA, subjecting to a new PI named HPA-ISE. The responses of the FOPDN-FOPIDN controller are related and are superior over PIDN and TIDN controllers. Moreover, the dominance of HPA-ISE is verified with ISE, and it performs better in terms of system dynamics. Further, the system performance reliability is analyzed with the AC-HVDC and is better than the AC system. Besides, sensitivity analysis recommends that the proposed FOPDN-FOPIDN at diverse conditions is robust and more reliability.
    Źródło:
    Archives of Control Sciences; 2023, 33, 2; 371--390
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Analysis of a Hybrid Circularly Polarized Multi-Band MIMO Antenna for Sub 6 GHz Applications
    Autorzy:
    Salma, S.
    Khan, Habibulla
    Madhav, B. T. P.
    Sandeep, D. Ram
    Suman, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055219.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    axial ratio
    circular polarization
    MIMO antennas
    SEA
    single element antenna
    Opis:
    In this article, a hybrid circularly polarized Multiple-Input Multiple-Output (MIMO) antenna for multi-band operation from 2.3 to 9.2 GHz with an impedance bandwidth of 7 GHz is proposed and investigated experimentally. The designed MIMO antenna model has a compact size of 20mm×40mm×1.6mm on the FR-4 substrate. The microstrip feed of the proposed slot antenna consists of a tapered structure, and the radiating element consists of the inverted L- shaped slots, which were opened on both sides of the radiating elements to introduce notches at the sub-6 GHz frequencies. L-shaped stubs are also introduced on another side of the substrate in the common ground plane to attain high isolation between the radiating elements of the proposed antenna. In the operating band from 2.3 to 9.2 GHz, isolation of less than -20 dB is achieved by the proposed model. The performance of the circularly polarized MIMO antenna in terms of RHCP and LHCP radiation patterns, axial ratio, surface current distributions, isolation between the ports, diversity gain (DG), envelope correlation coefficient (ECC), total active reflection coefficient (TARC), and peak gain are studied and presented in this work. The obtained characteristics of the proposed antenna make it suitable for sub-6-GHz frequency applications.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 570--577
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sylvia : agentka Mossadu
    Sylvia : life and death of a Mossad agent
    Autorzy:
    Kfir, Moti (1937- ).
    Oren, Ram (1936- ).
    Współwytwórcy:
    Borowski, Mateusz. Tłumaczenie
    Społeczny Instytut Wydawniczy Znak. pbl
    Data publikacji:
    2013
    Wydawca:
    Kraków : Społeczny Instytut Wydawniczy Znak
    Tematy:
    Rafael, Sylvia (1937-2005)
    Mossad
    Wywiad izraelski
    Biografia
    Opis:
    Na okł.: Prawdziwa historia agentki izraelskiego wywiadu. Na okł. i grzb. odwrotna kolejność aut.
    Dostawca treści:
    Bibliografia CBW
    Książka
    Tytuł:
    On optimal control problem subject to fractional order discrete time singular systems
    Autorzy:
    Chiranjeevi, Tirumalasetty
    Biswas, Raj Kumar
    Devarapalli, Ramesh
    Babu, Naladi Ram
    García Márquez, Fausto Pedro
    Powiązania:
    https://bibliotekanauki.pl/articles/2083465.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fractional optimal control problem
    discrete time singular system
    fractional derivative
    Hamiltonian technique
    Opis:
    In this work, we present optimal control formulation and numerical algorithm for fractional order discrete time singular system (DTSS) for fixed terminal state and fixed terminal time endpoint condition. The performance index (PI) is in quadratic form, and the system dynamics is in the sense of Riemann-Liouville fractional derivative (RLFD). A coordinate transformation is used to convert the fractional-order DTSS into its equivalent non-singular form, and then the optimal control problem (OCP) is formulated. The Hamiltonian technique is used to derive the necessary conditions. A solution algorithm is presented for solving the OCP. To validate the formulation and the solution algorithm, an example for fixed terminal state and fixed terminal time case is presented.
    Źródło:
    Archives of Control Sciences; 2021, 31, 4; 849-863
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biochemical constituents in leaf of Carica papaya - ethnomedicinal plant of Kachchh region
    Autorzy:
    Vyas, S.J.
    Khatri, T.T.
    Ram, V.R.
    Dave, P.N.
    Joshi, H.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/11094.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    biochemical constituent
    leaf
    fruit
    seed
    Carica papaya
    papaya
    medicinal plant
    ethnomedicine
    treatment
    Kachchh region
    India
    Opis:
    Carica papaya Linn. is one of the valuable plant used for various purposes in medicinal field. Leaves, fruit and seeds of the C. papaya are used as ethnomedicine. This work describes biochemical constituents of leaves of C. papaya. Fresh leaves samples of the plant were collected during the month of January, 2013 from different parts of Bhuj in Kachchh district (Gujarat), India. The purpose of the study was to evaluate the biochemical composition in leaves of C. papaya growing in the semi-arid region of Gujarat and based on the result to justify its importance in various treatments of diseases. The dried leaves were further analyzed for biochemical constituents like Ca2+, Mg2+, Na+, K+, Clˉ and Li+. The results indicated that the leaf extract of C. papaya has high potentiality for curing number of diseases.
    Źródło:
    International Letters of Natural Sciences; 2014, 07
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of multiple-area renewable integrated hydro-thermal system considering artificial rabbit optimized PI (FOPD) cascade controller and redox flow battery
    Autorzy:
    Saha, Arindita
    Chiranjeevi, Tirumalasetty
    Devarapalli, Ramesh
    Babu, Naladi Ram
    Dash, Puja
    Garcìa Màrquez, Fausto Pedro
    Powiązania:
    https://bibliotekanauki.pl/articles/27324511.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    solar thermal
    automatic generation control
    geothermal
    artificial rabbit optimization
    redox flow battery
    PI(FOPD) controller
    Opis:
    The current task explores automatic generation control knowledge under old-style circumstances for a triple-arena scheme. Sources in area-1 are thermal-solar thermal (ST); thermalgeothermal power plant (GPP) in area-2 and thermal-hydro in area-3. An original endeavour has been set out to execute a new performance index named hybrid peak area integral squared error (HPA-ISE) and two-stage controller with amalgamation of proportional-integral and fractional order proportional-derivative, hence named as PI(FOPD). The performance of PI(FOPD) has been compared with varied controllers like proportional-integral (PI), proportional-integralderivative (PID). Various investigation express excellency of PI(FOPD) controller over other controller from outlook regarding lessened level of peak anomalies and time duration for settling. Thus, PI(FOPD) controller’s excellent performance is stated when comparison is undergone for a three-area basic thermal system. The above said controller’s gains and related parameters are developed by the aid of Artificial Rabbit Optimization (ARO). Also, studies with HPA-ISE enhances system dynamics over ISE. Moreover, a study on various area capacity ratios (ACR) suggests that high ACR shows better dynamics. The basic thermal system is united with renewable sources ST in area-1 also GPP in area-2. Also, hydro unit is installed in area-3. The performance of this new combination of system is compared with the basic thermal system using PI(FOPD) controller. It is detected that dynamic presentation of new system is improved. Action in existence of redox flow battery is also examined which provides with noteworthy outcome. PI(FOPD) parameters values at nominal condition are appropriate for higher value of disturbance without need for optimization.
    Źródło:
    Archives of Control Sciences; 2023, 33, 4; 861--884
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resource Tuned Optimal Random Network Coding for Single Hop Multicast future 5G Networks
    Autorzy:
    Dong, Dhawa Sang
    Pokhrel, Yagnya Murti
    Gachhadar, Anand
    Qamar, Faizan
    Amiri, Iraj Sadegh
    Maharjan, Ram Krishna
    Powiązania:
    https://bibliotekanauki.pl/articles/226605.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    coding coefficients
    computational complexity
    lower triangular matrix
    random network coding
    sparse coding
    coefficients
    Opis:
    Optimal random network coding is reduced complexity in computation of coding coefficients, computation of encoded packets and coefficients are such that minimal transmission bandwidth is enough to transmit coding coefficient to the destinations and decoding process can be carried out as soon as encoded packets are started being received at the destination and decoding process has lower computational complexity. But in traditional random network coding, decoding process is possible only after receiving all encoded packets at receiving nodes. Optimal random network coding also reduces the cost of computation. In this research work, coding coefficient matrix size is determined by the size of layers which defines the number of symbols or packets being involved in coding process. Coding coefficient matrix elements are defined such that it has minimal operations of addition and multiplication during coding and decoding process reducing computational complexity by introducing sparseness in coding coefficients and partial decoding is also possible with the given coding coefficient matrix with systematic sparseness in coding coefficients resulting lower triangular coding coefficients matrix. For the optimal utility of computational resources, depending upon the computational resources unoccupied such as memory available resources budget tuned windowing size is used to define the size of the coefficient matrix.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 3; 463-469
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elevated strontium concentration in the blood of automobile workers in Kolkata
    Autorzy:
    Basu, R.
    Mukhopadhyay, A.
    Ray, S.S.
    Chakrabarti, P.
    Ram, S.S.
    Sudarshan, M.
    Chakrabarti, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1916666.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Strontium
    garage workers
    blood
    Energy Dispersive X-ray Fluorescence Technique
    Opis:
    Introduction: Though the trace element strontium’s (Sr) exact role in health remains unknown, at certain levels, it is toxic and, given the body’s low threshold for Sr, has been cited to cause nervous disorders. At different stages of the life cycle, organisms vary in their ability to discriminate Sr and calcium, which can cause age-related differences in gastrointestinal absorption. Though data regarding the effects of such absorption remain limited, it can reportedly impact health, the immune system, and chromosomal aberration. Purpose: To investigate and correlate levels of Sr concentration and any health problems at certain levels among automobile workers. Materials and methods: The blood of 41 automobile workers and 26 healthy controls of the Kolkata region was collected and whole blood Sr concentration estimated by the energy dispersive X-ray fluorescence (EDXRF) technique. Results: Automobile workers showed significantly (p <0.001) higher blood SR levels than controls from the same area, despite similar dietary habits and drinking-water quality. Conclusions: Automobile workers are exposed to different pollutants that can harm their health, and a trace element imbalance of Sr and its elevated concentrations in the blood may cause different health complications.
    Źródło:
    Progress in Health Sciences; 2014, 4, 2; 186-189
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and antimicrobial activity of oxadiazole nucleus containing 2,5-substituted 1,3,4-oxadiazole derivatives
    Autorzy:
    Gajera, Jayesh L
    Sutariya, Jignesh K.
    Rakesh Gothwal, Rakesh
    Sharma, Vinay S.
    Ram, Haresh
    Godhaviya, Pankaj K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839273.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    cyclohexanecarbohydrazide
    antibacterial
    antifungal
    1,3,4-oxadiazole
    Opis:
    In this study, we report the synthesis of 2,5-substituted 1,3,4-oxadiazole derivatives using condensation of cyclohexanecarbohydrazide derivatives and carbon disulfide. In present study, we have prepared total seven derivatives based on 1,3,4-oxadiazole core further functionalized with thiol moieties. The structures of synthesized compounds (C1-C9) were confirmed by the 1H NMR, and Mass spectrometry. These synthesized molecules were subjected to antibacterial and fungal activity against selected microbial and fungal strains. Some of derivatives showed good biological behaviour against gram positive and gram negative bacteria.
    Źródło:
    World Scientific News; 2021, 162; 75-86
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fixed terminal time fractional optimal control problem for discrete time singular system
    Autorzy:
    Chiranjeevi, Tirumalasetty
    Devarapalli, Ramesh
    Babu, Naladi Ram
    Vakkapatla, Kiran Babu
    Rao, R. Gowri Sankara
    Garcìa Màrquez, Fausto Pedro
    Powiązania:
    https://bibliotekanauki.pl/articles/2175112.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fractional order differential equation
    discrete time singular system
    fractional derivative
    linear quadratic optimal control problem
    Opis:
    This paper presents the formulation and numerical simulation for linear quadratic optimal control problem (LQOCP) of free terminal state and fixed terminal time fractional order discrete time singular system (FODSS). System dynamics is expressed in terms of Riemann-Liouville fractional derivative (RLFD), and performance index (PI) in terms of state and costate. Because of its complexity, finding analytical and numerical solutions to singular system (SS) is difficult. As a result, we use coordinate transformation to convert FODSS to its corresponding fractional order discrete time nonsingular system (FODNSS). After that, we obtain the necessary conditions by employing a Hamiltonian approach. The relevant conditions are solved using the general solution approach. For the analysis of formulation and solution algorithm, a numerical example is illustrated. Results are obtained for various values. According to state of the art, this is the first time that a formulation and numerical simulation of free terminal state and fixed terminal time optimal control problem (OCP) of FODSS is presented.
    Źródło:
    Archives of Control Sciences; 2022, 32, 3; 489--506
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conjoined twins – role of imaging and recent advances
    Bliźnięta nierozdzielone – rola badań obrazowych oraz nowe technologie
    Autorzy:
    Mathew, Rishi Philip
    Francis, Swati
    Basti, Ram Shenoy
    Suresh, Hadihally B.
    Rajarathnam, Annie
    Cunha, Prema D.
    Rao, Sujaya V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033313.pdf
    Data publikacji:
    2017
    Wydawca:
    Medical Communications
    Tematy:
    3D printing
    cephalopagus
    conjoined twins
    omphalopagus
    thoracopagus
    Opis:
    Introduction: Conjoined twins are identical twins with fused bodies, joined in utero. They are rare complications of monochorionic twinning. The purpose of this study is to describe the various types of conjoined twins, the role of imaging and recent advances aiding in their management. Material and methods: This was a twin institutional study involving 3 cases of conjoined twins diagnosed over a period of 6 years from 2010 to 2015. All the 3 cases were identified antenatally by ultrasound. Only one case was further evaluated by MRI. Results: Three cases of conjoined twins (cephalopagus, thoracopagus and omphalopagus) were accurately diagnosed on antenatal ultrasound. After detailed counseling of the parents and obtaining written consent, all the three cases of pregnancy were terminated. Delivery of the viable conjoined twins was achieved without any complications to the mothers, and all the three conjoined twins died after a few minutes. Conclusion: Ultrasound enables an early and accurate diagnosis of conjoined twins, which is vital for obstetric management. MRI is reserved for better tissue characterization. Termination of pregnancy when opted, should be done at an early stage as later stages are fraught with problems. Recent advances, such as 3D printing, may aid in surgical pre-planning, thereby enabling successful surgical separation of conjoined twins.
    Wstęp: Bliźnięta nierozdzielone to bliźnięta jednojajowe zrośnięte ze sobą w życiu płodowym. Jest to rzadkie powikłanie wśród bliźniąt jednokosmówkowych. Celem niniejszej pracy było przedstawienie różnych rodzajów bliźniąt nierozdzielonych, a także omówienie roli badań obrazowych oraz nowych technologii usprawniających postępowanie w takich przypadkach. Materiał i metody: Badaniem, przeprowadzonym w dwóch ośrodkach, objęto trzy przypadki bliźniąt nierozdzielonych, zdiagnozowane w okresie 6 lat – od 2010 do 2015 roku. W każdym przypadku rozpoznanie ustalono w prenatalnym badaniu ultrasonograficznym. W jednym przypadku w toku dalszej diagnostyki przeprowadzono badanie metodą rezonansu magnetycznego. Wyniki: Prezentowane trzy przypadki bliźniąt nierozdzielonych (cephalopagus, thoracopagus i omphalopagus) zostały prawidłowo zidentyfikowane w prenatalnym badaniu ultrasonograficznym. Po szczegółowym omówieniu rozpoznania z rodzicami oraz otrzymaniu pisemnej zgody wszystkie ciąże terminowano. Poród żywych bliźniąt był niepowikłany dla matek i we wszystkich przypadkach dzieci zmarły kilka minut po urodzeniu. Wnioski: Badanie ultrasonograficzne umożliwia wczesne i trafne rozpoznanie bliźniąt nierozdzielonych, co jest kluczowe w położnictwie. Rezonans magnetyczny stosuje się w celu bardziej szczegółowego scharakteryzowania tkanek. W przypadku decyzji o terminacji ciąży odpowiednie postępowanie należy wdrożyć jak najwcześniej, ze względu na problemy, jakie mogą się pojawić w późniejszych etapach ciąży. Nowe technologie, jak druk trójwymiarowy, mogą być pomocne w planowaniu zabiegów chirurgicznych i umożliwiają tym samym skuteczne rozdzielenie bliźniąt. Artykuł w wersji polskojęzycznej jest dostępny na stronie http://jultrason.pl/index.php/wydawnictwa/volume-17-no-71
    Źródło:
    Journal of Ultrasonography; 2017, 17, 71; 259-266
    2451-070X
    Pojawia się w:
    Journal of Ultrasonography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New information on the pterosaur Tupandactylus imperator, with comments on the relationships of Tapejaridae
    Autorzy:
    Pinheiro, F.L.
    Fortier, D.C.
    Schultz, C.L.
    Andrade,de, J.A.F.G.
    Bantim, R.A.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/22426.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    new information
    pterosaur
    Tupandactylus imperator
    relationship
    Tapejaridae
    Pterosauria
    phylogenesis
    Crato Formation
    Brazil
    paleontology
    Tapejarinae
    Thalassodrominae
    Opis:
    A new specimen of Tupandactylus imperator, comprising an incomplete skull with associated lower jaw, is described. The material is the best preserved specimen of this species known so far and provides new information on the anatomy of this pterodactyloid pterosaur, especially with respect to the morphology of the lower jaw, the first one formally described for the species. Also, the new specimen shows an extensive preservation of soft tissues such as the soft−tissue component of the headcrest, ramphoteca associated with the premaxillae and lower jaw, as well as probable pycnofibres. A phylogenetic analysis was performed in order to test the relationships of the taxon within Tapejaridae. The results of the analysis support Tapejaridae, as well as monophyly of Tapejarinae and Thalassodrominae.
    Źródło:
    Acta Palaeontologica Polonica; 2011, 56, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Far-Infrared Magneto-Optical Studies of HgTe-CdTe Superlattices in the Semimetallic Regime
    Autorzy:
    Wojtowicz, T.
    Dobrowolska, M.
    Furdyna, J.K.
    Meyer, J. R.
    Bartoli, F. J.
    Hoffman, C. A.
    Ram-Mohan, L. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1888086.pdf
    Data publikacji:
    1991-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.65.Fa
    78.30.Fs
    Opis:
    We review recent magneto-optical investigations performed on HgTe-CdTe semimetallic superlattices. Far infrared magnetotransmission data obtained as a function of temperature, photon energy, and sense of circular polarization are compared with the predictions of a comprehensive new theory which fully incorporates the complexities of type-III superlattice band structure. It is found that the theory accounts for nearly all of the many unusual features which have been observed experimentally. These include the occurrence of two cyclotron resonances due to holes; the coexistence of electron and hole cyclotron resonances in the low temperature limit; the observation of three distinct CRA minima; a step-like change in the temperature dependence of the electron cyclotron mass; and a dramatic increase of the CRI absorption peak intensity with increasing magnetic field.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 2; 245-254
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of N-Methyl Indole Derivatives via Desulfitative Displacement by Various Amines and Its Antimicrobial Activity
    Autorzy:
    Chodvadiya, Vijay D.
    Pambhar, Kaushik D.
    Parmar, Nilesh D.
    Dhamsaniya, Ashish P.
    Safi, Shahrukh khan A.
    Chhatbar, Pratiksha V.
    Ram, Hemal N.
    Khunt, Ranjan C.
    Patel, P. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065130.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Anti-microbial agents
    Desulfitative displacement
    N-methyl indole
    S-methyl
    Opis:
    A modular three step synthetic approach of N-methyl indole derivatives has been carried out by the condensation of N-methyl indole with cyanoacetic acid using acetic anhydride as solvent to yield 3-cyanoacetyl N-methyl indole, which further reacts with carbon disulphide and methyl iodide in basic condition to obtain 2-(1-methyl-1H-indole-3-carbonyl)-3,3-bis(methylthio)acrylonitrile as a scaffold. Subsequent, the scaffold when reacts with substituted various amine derivatives via desulfitative displacement forms new derivatives of 3-((substitutedphenyl)amino)-2-(1-methyl-1H-indole-3-carbonyl)-3-(methylthio)acrylonitrile in moderate to good yields. All the novel compounds were evaluated for their antimicrobial activity against Gram+ve and Gram-ve bacteria and different fungal species which demonstrated well to moderate antimicrobial activity.
    Źródło:
    World Scientific News; 2019, 120, 2; 181-191
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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