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Wyświetlanie 1-15 z 76
Tytuł:
A Comparison of Paraxial and Extended Paraxial Approach in Laser Propagation and Second Harmonic Generation
Autorzy:
Sharma, P.
Powiązania:
https://bibliotekanauki.pl/articles/1419745.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.38.-r
52.38.Hb
52.38.Mf
Opis:
The propagation of laser beam in the plasma has been investigated for two cases, first with imposing the restriction of paraxial approximation on the beam profile, and second, relaxing the restriction on the profile up to a certain extent. The beam width parameter of the propagating laser beam has been compared for both the cases. Since the off-paraxial part of the beam affects background densities, consequently it will also influence the 2nd harmonic generation. Therefore, comparison of results has been done on the generated second harmonic, in the light of these two cases. A notable change is found in the magnitude of second harmonic yield in modified-paraxial case as compared to the paraxial case.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 122-127
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shaking during ion-atom collisions
Autorzy:
Sharma, P.
Nandi, T.
Powiązania:
https://bibliotekanauki.pl/articles/1158707.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.xp
34.50.Fa
25.70.Bc
Opis:
The shaking (shakeup and shakeoff) processes accompanying ion-atom collisions are studied using non-relativistic hydrogenic wave functions for the K-, L- and M-shell electrons in the sudden approximation limit. The role of recoil amplitude in the shaking processes is discussed. It is found that the suddenness of collision between projectile and target nuclei plays a more definitive factor in the shaking of the respective atomic system than the recoil of nuclei.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 697-700
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphological characterization of biocontrol isolates of Trichoderma to study the correlation between morphological characters and biocontrol efficacy
Autorzy:
Kumar, M.
Sharma, P.
Powiązania:
https://bibliotekanauki.pl/articles/11742.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
The morphological characterization was carried out for 5 isolates of Trichoderma harzianum and 7 isolates of Trichoderma viride and tested for their biocontrol efficacy. The isolates belonging to T.harzianum were analogous in colony colour, culture smell, mycelial colour, conidiation, conidial shape, conidial wall and conidial colour. Correspondingly the isolates of T.viride showed certain similarity in colony colour, colony edge, culture smell, conidiophore branching, conidial wall, conidial colour and chlamydospores. Inter specific differences through cluster analysis based on morphological characters grouped the twelve isolates into three major clusters where all the isolates of T.harzianum formed a single cluster while the isolates of T.viride were bifurcated into two groups. The clustering was substantiated by similarity index which showed maximum similarity among T.harzianum isolates with only less than 20% variation among themselves. Similarly the clusters having isolates of T.viride also had less variation within them. The biocontrol efficacy of these twelve isolates of Trichoderma was experimented by dual culture test under laboratory condition and there existed some relation between the biocontrol efficacy of these isolates and morphology.
Źródło:
International Letters of Natural Sciences; 2016, 55
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Surface Tension and Rotation on Rayleigh-Taylor Instability of Two Superposed Fluids with Suspended Particles
Autorzy:
Sharma, P.
Prajapati, R.
Chhajlani, R.
Powiązania:
https://bibliotekanauki.pl/articles/1535630.pdf
Data publikacji:
2010-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.50.Gj
52.35.Py
47.20.Ib
06.30.Gv
47.10.-g
Opis:
The Rayleigh-Taylor instability of two superposed incompressible fluids of different densities in the presence of small rotation, surface tension and suspended dust particles is investigated. The linearized equations of the problem are constructed and the general dispersion relation is obtained using normal mode analysis by applying the appropriate boundary conditions. The effects of surface tension, the Atwood number, small rotation and suspended dust particles are studied on both conditions of Rayleigh-Taylor instability and growth rate of the unstable Rayleigh-Taylor mode. The numerical calculations have been performed to see the effect of rotation, the Atwood number, relaxation frequency and mass concentration of suspended dust particles. It is found that the growth rate of Rayleigh-Taylor instability depends upon the mass concentration and relaxation frequency of suspended dust particles. The uniform small rotation, relaxation frequency and mass concentration of suspended dust particles all have stabilizing influence on the growth rate of Rayleigh-Taylor instability. It is also found that the Atwood number has destabilizing influence on the growth rate of the considered Rayleigh-Taylor configuration.
Źródło:
Acta Physica Polonica A; 2010, 118, 4; 576-584
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wireless Sensor Node Localization based on LNSM and Hybrid TLBO : Unilateral technique for Outdoor Location
Autorzy:
Kaundal, V.
Sharma, P.
Prateek, M.
Powiązania:
https://bibliotekanauki.pl/articles/226010.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
log normal shadowing model (LNSM)
teacher learning based optimization (TLBO)
trilateration
unilateral
RSSI
ZigBee
wireless sensor network
Opis:
The paper aims at localization of the anchor node (fixed node) by pursuit nodes (movable node) in outdoor location. Two methods are studied for node localization. The first method is based on LNSM (Log Normal Shadowing Model) technique to localize the anchor node and the second method is based on Hybrid TLBO (Teacher Learning Based Optimization Algorithm) - Unilateral technique. In the first approach the ZigBee protocol has been used to localize the node, which uses RSSI (Received Signal Strength Indicator) values in dBm. LNSM technique is implemented in the self-designed hardware node and localization is studied for Outdoor location. The statistical analysis using RMSE (root mean square error) for outdoor location is done and distance error found to be 35 mtrs. The same outdoor location has been used and statistical analysis is done for localization of nodes using Hybrid TLBO-Unilateral technique. The Hybrid-TLBO Unilateral technique significantly localizes anchor node with distance error of 0.7 mtrs. The RSSI values obtained are normally distributed and standard deviation in RSSI value is observed as 1.01 for outdoor location. The node becomes 100% discoverable after using hybrid TLBO- Unilateral technique.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 4; 389-397
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a functional fermented peanut-based cheese analog using probiotic bacteria
Autorzy:
Sharma, P.
Sharma, D.
Amin, A.
Powiązania:
https://bibliotekanauki.pl/articles/80259.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cheese
analogue
proteolysis
cell viability
peanut
probiotic microorganism
probiotic bacteria
Lactobacillus rhamnosus
fermentation
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 4
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First report of Colletotrichum gloeosporioides of Jasminum grandiflorum in India
Autorzy:
Sharma, P.
Singh, N.
Verma, O.P.
Powiązania:
https://bibliotekanauki.pl/articles/65435.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Anthracnose disease symptoms were observed on Jasminum grandiflorum. The spots were dark red and mostly irregular shaped lesions on leaves. Acervuli containing masses of spores and dark setae were observed within lesions. The fungus after purification was identified as Colletotrichum gloeosporioides. This is the first report from India and elsewhere showing that C. gloeosporioides causes anthracnose on J. grandiflorum.
Źródło:
Journal of Plant Protection Research; 2012, 52, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Residual life estimation of fabricated humidity sensors using different artificial intelligence techniques
Autorzy:
Bhargava, C.
Aggarwal, J.
Sharma, P. K.
Powiązania:
https://bibliotekanauki.pl/articles/201564.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite material
artificial intelligence
humidity sensor
accelerated life testing
SEM
materiał kompozytowy
sztuczna inteligencja
czujnik wilgotności
Opis:
Background: a humidity sensor is used to sense and measure the relative humidity of air. A new composite system has been fabricated using environmental pollutants such as carbon black and low-cost zinc oxide, and it acts as a humidity sensor. Residual life of the sensor is calculated and an expert system is modelled. For properties and nature confirmation, characterization is performed, and a sensing material is fabricated. Methodology: characterization is performed on the fabricated material. Complex impedance spectroscopy (CIS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) are all used to confirm the surface roughness, its composite nature as well as the morphology of the composite. The residual lifetime of the fabricated humidity sensor is calculated by means of accelerated life testing. An intelligent model is designed using artificial intelligence techniques, including the artificial neural network (ANN), fuzzy inference system (FIS) and adaptive neuro-fuzzy inference system (ANFIS). Results: maximum conductivity obtained is 6.4£10−3 S/cm when zinc oxide is doped with 80% of carbon black. Conclusion: the solid composite obtained possesses good humidity-sensing capability in the range of 30–95%. ANFIS exhibits the maximum prediction accuracy, with an error rate of just 1.1%.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 1; 147-154
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New CPW-fed Patch Antenna for UWB Applications
Autorzy:
Sharma, P.
Jha, S. K.
Bhattacharya, P. P.
Powiązania:
https://bibliotekanauki.pl/articles/308292.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
planar antenna
ultra wideband
wireless communication
Opis:
In this paper, the design and analysis of a compact size coplanar waveguide (CPW)-fed antenna for ultrawideband (UWB) applications is presented. The antenna has a compact size of 20×20×1.1 .5 .mm and provides a good impedance matching over the entire bandwidth of 3.2–14.3 GHz. The characteristics parameters, i.e. return loss, VSWR and radiation pattern, are analyzed using HFSS 11.0 software.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 2; 75-78
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aspergillus niger, a dominant phylloplane coloniser, influences the activity of defense enzymes in Solanum lycopersicum
Autorzy:
Goswami, S.
Paul, P.K.
Sharma, P.D.
Powiązania:
https://bibliotekanauki.pl/articles/2084798.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Aspergillus niger
phylloplane
peroxidase
phenylalanine ammonia lyase
polyphenol oxidase
Solanum lycopersicum
tyrosine ammonia lyase
Opis:
Phylloplane microbes have been studied as strategic tools in management against plant pathogens. Non-pathogenic bacteria and fungi have been applied as crop protectants against various plant diseases. The present study aimed at evaluating the potentiality of Aspergillus niger spores in altering the activity of four key enzymes related to defense in tomato. The experiment was designed such that two groups of 50 tomato plants were considered: group 1 – sprayed with autoclaved distilled water (control) and group 2 – sprayed with A. niger spores. Spraying was carried out under aseptic conditions. The experimental parameters included analysis of the activity of peroxidase (POX), polyphenol oxidase (PPO), phenylalanine ammonia lyase (PAL) and tyrosine ammonia lyase (TAL) as well as expression of POX and PPO isoforms. The results demonstrated an inductive effect of A. niger on the activity of POX, PPO, PAL and TAL. Enhanced expression of POX and PPO isoforms was also observed. The results indicated that A. niger can be considered probiotic for the management of tomato against its phytopathogens.
Źródło:
Journal of Plant Protection Research; 2019, 59, 4; 512-518
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Power Efficiency in OFDM System by SLM with Predistortion Technique
Autorzy:
Sharma, P. K.
Nagaria, R. K.
Sharma, T. N.
Powiązania:
https://bibliotekanauki.pl/articles/308396.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
nonlinear HPA
OFDM
PAPR
SLM
Opis:
Orthogonal Frequency Division Multiplexing (OFDM) is considered as a strong candidate for future wireless communication because it is marked by its higher frequency multiplicity and greater immunity to multipath fading. However, the main drawback of OFDM is its high amplitude fluctuations measured by peak-to-average power ratio (PAPR), which leads to power inefficiency and requires expensive high power amplifier (HPA) with very good linearity. In this paper, we propose selected mapping (SLM) with predistortion technique to decrease the nonlinear distortion and to improve the power efficiency of the nonlinear HPA. In the proposed method SLM reduces the PAPR and improves the power efficiency, the predistorter improves the bit error rate (BER) performance of the system. The PAPR reduction is possible with SLM when compared with original OFDM. After reducing the PAPR with SLM the data goes into the HPA with and without predistorter. The BER performance curves of SLM method with or without predistorter shows that, predistorter operates more effectively in SLM method than original OFDM system. At 4 dB IBO (input backoff) the conventional method with predistorter achieves 1.8 dB SNR gain than conventional method without a predistorter and at 6 dB IBO the BER performance is towards the ideal linear amplifier. The proposed system will be evaluated for OFDM system in the presence of a nonlinear power amplifier.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 4; 86-91
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preferentially Oriented Growth of L1₀ FePt on Si Substrate
Autorzy:
Kaushik, N.
Sharma, P.
Tanaka, S.
Makino, A.
Esashi, M.
Powiązania:
https://bibliotekanauki.pl/articles/1387798.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.En
75.50.Ss
75.50.Vv
75.70.Ak
Opis:
Tilting the magnetic easy axis of L1₀ FePt and/or introducing a magnetic buffer layer is most effective in realizing the L1₀ based magnetic recording media. Here we report on preferentially oriented growth of L1₀ FePt with tilted magnetic easy axis. FePt films of thickness up to 170 nm were deposited on Si substrate with a soft magnetic underlayer of glassy FeSiB, FeSiBP and CoFeTaB. Effects of processing conditions on the structural and magnetic properties were studied. A polycrystalline growth of FePt (i.e. mixed orientation) was observed with the underlayer of FeSiB and FeSiBP, but CoFeTaB promotes preferentially oriented growth along (111) crystallographic direction. Compared to FePt films grown on Si substrate, coercivity $(H_{c})$ reduces significantly with the introduction of soft magnetic underlayer. The magnetic easy axis of (111) L1₀ FePt is tilted 36 out of plane and it is very promising for tilted magnetic recording media.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 611-613
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Presence of intracellular viruses in human Cryptosporidium isolates
Autorzy:
Sharma, P.
Khurana, S.
Sharma, A.
Sehgal, R.
Malla, N.
Powiązania:
https://bibliotekanauki.pl/articles/5602.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Parazytologiczne
Opis:
Cryptosporidium is a major cause of diarrheal illness mainly in children and immunocompromised adults. Disease severity ranges from asymptomatic or self-limited gastroenteritis to acute or chronic diarrhoea which may be associated with systemic features. Intracellular viruses that reside in many parasites have been incriminated in pathogenesis of diseases like trichomoniasis, leishmaniasis etc. Thus we attempted to detect and quantitate the intracellular viruses in Cryptosporidium isolates and sought to seek a relationship if any, with clinical features. Cryptosporidia in stool samples from immunocompromised patients and children were identified by microscopy and species differentiated by PCR-RFLP of 18s rRNA; further subgenotyped by sequencing of GP60 region. Copy number of dsRNA virus and 18srRNA was calculated in 56 Cryptosporidium isolates (39 C. hominis and 17 C. parvum). Viral copy number per oocyst was calculated as ratio of dsRNA virus copy number to 18s rRNA copy number. Viruses were detected in all the isolates. Mean CSpV/RNA ratio was 0.17±0.4 for C. hominis isolates compared with 0.12±0.11 for C. parvum isolates, however this difference was not statistically significant. Similarly no association of diarrhoea, vomiting, cough and fever was found with either CSpV copy number or with CSpV/rRNA ratio.
Źródło:
Annals of Parasitology; 2016, 62, 2
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Business performance measurements in asset management with the support of big data technologies
Pomiary wydajności biznesowej w zarządzaniu aktywami ze wsparciem technologii big data
Autorzy:
Campos, J.
Sharma, P.
Jantunen, E.
Baglee, D.
Fumagalli, L.
Powiązania:
https://bibliotekanauki.pl/articles/410199.pdf
Data publikacji:
2017
Wydawca:
STE GROUP
Tematy:
business performance measurements
asset management
big data technologies
pomiary wydajności biznesowej
zarządzanie aktywami
technologie big data
Opis:
The paper reviews the performance measurement in the domain of interest. Important data in asset management are further, discussed. The importance and the characteristics of today’s ICTs capabilities are also mentioned in the paper. The role of new concepts such as big data and data mining analytical technologies in managing the performance measurements in asset management are discussed in detail. The authors consequently suggest the use of the modified Balanced Scorecard methodology highlighting both quantitative and qualitative aspects, which is crucial for optimal use of the big data approach and technologies.
W artykule przedstawiono pomiar wydajności w dziedzinie zainteresowań. Następnie omawiane są ważne dane dotyczące zarządzania aktywami. W artykule wymieniono również znaczenie i cechy charakterystyczne dla dzisiejszych technologii informacyjno-komunikacyjnych. Szczegółowo omówiono rolę nowych koncepcji, takich jak big data i technologie analityczne dotyczące wyszukiwania danych w zarządzaniu pomiarami wydajności w zarządzaniu aktywami. Autorzy sugerują zastosowanie metodologii zmodyfikowanej Strategicznej Karty Wyników, która podkreśla zarówno aspekty ilościowe, jak i jakościowe, co jest kluczowe dla optymalnego wykorzystania podejścia i technologii big data.
Źródło:
Management Systems in Production Engineering; 2017, 3 (25); 143-149
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on harmonic analysis of functionally graded plates using FEM
Autorzy:
Sharma, A. K.
Sharma, P.
Chauhan, P. S.
Bhadoria, S. S.
Powiązania:
https://bibliotekanauki.pl/articles/265506.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
metoda elementów skończonych
drgania swobodne
amplituda drgań
finite element method
functionally graded plate
free vibration
Opis:
This paper presents the harmonic and vibration analysis of functionally graded plates using the finite element method. Initially, the plates are assumed isotropic and the material properties of it are assumed to vary continuously through their thickness direction according to a power-law distribution of the volume fractions of the plate constituents. The four noded shell element is used to analyse the functionally graded plates. Four functionally graded plates-Al/Al2O3, Al/ZrO2, Ti–6Al–4V/Aluminium oxide, and SUS304/Si3N4 are considered in the study, and their results are obtained so that the right choice can be made in applications in high temperature environment and in reducing the vibration amplitudes in applications such as aircrafts, rockets, missiles, etc. Numerical results for the natural frequency and harmonic response amplitude are presented. Results are compared and validated with available results in the literature. Effects of boundary conditions, material and damping on natural frequency and harmonic response of the functionally graded plates are also investigated.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 4; 941-961
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 76

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