OALib Journal期刊

ISSN: 2333-9721




2017 ( 70 )

2016 ( 245 )

2015 ( 1036 )

2014 ( 1364 )


匹配条件: “Kumar Dhirendra” ,找到相关结果约20706条。
Compact Low Pass Filter Design for L-Band Application  [PDF]
Dhirendra Kumar, Asok De
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.34018
Abstract: An effective technique to design compact low pass filter has been proposed in this paper. The proposed method is highly effective for L-band applications. Low impedance microstrip lines are arranged such that they work as open stubs to increase the selectivity of the filter. Using the proposed technique about 57% size reduction has been realized with sharper roll off characteristics. An empirical expression is derived to determine the dimension of resonators. For cut-off frequency of 1.7 GHz the investigated method has been fabricated and tested. There is a close agreement be-tween simulated and measured results
Effective Size Reduction Technique for Microstrip Filters  [PDF]
Dhirendra Kumar, Asok De
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2013, DOI: 10.4236/jemaa.2013.54027

In this paper an effective size reduction technique using fractal structure is suggested. The proposed technique has been applied on a band stop and a low pass filter separately. This technique provides 42% reduction of size for the band stop filter and about 26% for the low pass counterpart. Both the designed structures are fabricated and the measured results are compared with the simulated results. The proposed technique does not require any recalculation or optimization of dimensions of the filter, and is straightforward to implement. The band stop filter is designed for the center frequency of 3 GHz where as the cut-off frequency for low pass filter is 2.5 GHz. A good agreement between the simulated and measured results is observed. A comprehensible explanation of the proposed technique is also provided.

Role of Enterprise Excellence Initiative
International Journal of Business and Management , 2010, DOI: 10.5539/ijbm.v5n8p3
Abstract: The Enterprise Excellence (EE) philosophy is a holistic model for leading an enterprise to total excellence by focusing on the needs of the customer whether within the state, the nation, and the world. The rate of change in today’s competitive world is constantly increasing. Competition is forcing businesses to be well funded and at the same time, customers are becoming unpredictable. These requirements are creating practical problems of the modern world and the applied research initiative will solve these problems. For example, applied research from enterprise point of view will focus on uncovering what needs are not being met within a targeted market and use that information to begin formulating products or services (including existing products) that will be attractive and desirable. Therefore, to catalyze the transformation of economies tied to these industries, the Enterprise Excellence Initiative (EEI) must be nurtured and developed.
Element Concentration in the Prepared and Commercial Feed as Well Their Status in the Breast Muscle of Chicken after Prolonged Feeding  [PDF]
Jayanta Kumar Goswami, Satya Sarmah, Dhirendra K. Sharma
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.411152

Quality poultry meat depends upon the feed and as such there are many commercially available feeds. However, their composition and standard by and large throughout the year may not remain same due to obvious reasons. Moreover, there is no mention of locally produced feed particularly in the north eastern part of India. The major objective of this study was to prepare mesh feed E1 with the available ingredients as well as their effect were compared with that of the two commercially available feed Amrit and Godrej (E2 and E3) in terms of Crude protein, fats and element composition. The findings showed that the protein content (240 g/kg) and fats (105 g/kg) in the breast muscle of female was higher in the E3 received against the broiler chicken received local feed. Element analysis of the E1, E2 and E3 depicted significantly higher value of Ca, K, Cu Zn and Se against the commercial feed. Other elements like Mg, Na, Fe, P, and Mn showed no variation while compared E1, E2 and E3 together. Thus the present findings suggest that the local feed E1 could be accepted at per with that of the commercial feed for poultry.

Refractometric Studies on Molecular Interactions in Six Binary Liquid Mixtures  [PDF]
Nizamul Haque Ansari, Anand Trivedi, Dhirendra Kumar Sharma, Prakash Chandra
Open Journal of Physical Chemistry (OJPC) , 2014, DOI: 10.4236/ojpc.2014.41001

Refractive indices of the six binary mixtures between N-Butyl bromide with Aniline, Benzene, Xylene, Carbon tetrachloride, n-Heptane and Toluene for the entire concentration range have been measured at 303.15 K. Furthermore, deviation in refractive indices from ideal mixture, molar refraction, deviation in molar refraction from ideal values for these mixtures has also been evaluated. The results are discussed in term of molecular interactions between the components of the binary mixtures.

Survey of MAC Layer Protocols for vehicular Ad Hoc Network
Vimal Bibhu,Dhirendra Kumar Singh
International Journal of Information Technology and Computer Science , 2012,
Abstract: Vehicular Ad Hoc Network is currently challenge for the wireless networking and its researchers. In this paper we have proposed the survey of the different MAC Layer protocols of the wireless medium those can be implemented in the Vehicular Ad Hoc Networking. The survey is based upon the study of the different protocol on their MAC level and its performance factors is evaluated. The performance factor is extracted from the studied materials and current working conditions of the protocols. These all factors are mobility, accuracy, privacy and confidentiality, safety critical message priority, delay control and suitability on vehicle and roadside. According to analyzed performance factor the IEEE 802.11p Wave is most suitable protocol for the Vehicular Ad Hoc Network but it does not cover up all conditional requirements.
Learning from Decoys to Improve the Sensitivity and Specificity of Proteomics Database Search Results
Amit Kumar Yadav, Dhirendra Kumar, Debasis Dash
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0050651
Abstract: The statistical validation of database search results is a complex issue in bottom-up proteomics. The correct and incorrect peptide spectrum match (PSM) scores overlap significantly, making an accurate assessment of true peptide matches challenging. Since the complete separation between the true and false hits is practically never achieved, there is need for better methods and rescoring algorithms to improve upon the primary database search results. Here we describe the calibration and False Discovery Rate (FDR) estimation of database search scores through a dynamic FDR calculation method, FlexiFDR, which increases both the sensitivity and specificity of search results. Modelling a simple linear regression on the decoy hits for different charge states, the method maximized the number of true positives and reduced the number of false negatives in several standard datasets of varying complexity (18-mix, 49-mix, 200-mix) and few complex datasets (E. coli and Yeast) obtained from a wide variety of MS platforms. The net positive gain for correct spectral and peptide identifications was up to 14.81% and 6.2% respectively. The approach is applicable to different search methodologies- separate as well as concatenated database search, high mass accuracy, and semi-tryptic and modification searches. FlexiFDR was also applied to Mascot results and showed better performance than before. We have shown that appropriate threshold learnt from decoys, can be very effective in improving the database search results. FlexiFDR adapts itself to different instruments, data types and MS platforms. It learns from the decoy hits and sets a flexible threshold that automatically aligns itself to the underlying variables of data quality and size.
Structural studies on Multiferroic La1-xBixCrO3 Perovskites
Aga Shahee,Dhirendra Kumar,N. P. Lalla
Physics , 2014, DOI: 10.1063/1.3606316
Abstract: The synthesis and structural studies on the polycrystalline La1-xBixCrO3 (x =0, 0.2, 0.25, 0.3, 0.35) have been done using XRD and TEM. The results of the Reitveld refinement of XRD data shows that these compounds crystallize in an orthorhombic structure with Pnma space group. With increasing Bi content, the unit cell volume and lattice parameters undergo non monotonous changes within the tolerance factor from 0.84092 to 0.84072. This has been attributed to the anisotropy induced by lone pair of Bi3+, which may distorted the lattice.
Multiferroic Studies on La0.7Bi0.3CrO3 Perovskite
Aga Shahee,Dhirendra kumar,N. P. Lalla
Physics , 2014, DOI: 10.1063/1.3606314
Abstract: Magnetic and dielectric properties on a polycrystalline La0.7Bi0.3CrO3 have been investigated. A canted antiferromagnetic (CAF) phase transition giving weak ferromagnetism at TN = 230K has been observed. M-H at 10K shows non-saturating trend, even up to 5T, confirms the CAF ordering. The permittivity ({\epsilon}')-vs-temperature (T) variation shows a relaxor ferroelectric (RFE) nature accompanied by a pronounced anomaly in {\epsilon}'-T at TN. The anomaly in {\epsilon}'-T at TN indicates the presence of magentoelectric (ME) coupling in this material.
Glass-like kinetic arrest of first-order structural phase transition in LaxMnO3{\pm}δ (x= 1 & 0.9)
Aga Shahee,Dhirendra Kumar,N. P. Lalla
Physics , 2011,
Abstract: We report here the occurrence of glass-like kinetic-arrest of first-order phase transition of R-3c to Pbnm in a supercooled LaxMnO3\pm{\delta} (X= 1 & 0.9 and {\delta}>0.125) below its insulator-metal transition employing low-temperature transmission electron microscopy (TEM) and x-ray diffraction. No transformation was observed even in a ~12 hrs aged LaxMnO3\pm{\delta} at 98K until unless it was triggered insitu using e-beam irradiation in TEM. A systematic triggering at different temperatures has revealed the occurrence of kinetic-arrest situation similar to stable glass-formers. This has been attributed to the suppression of Johan-Teller distortion by double exchange. PACS number(

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