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Search Results: 1 - 10 of 444753 matches for " D. J. Singh "
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Cardiovascular Haemodynamics and Some Biochemical Profiles of Endotoxemic Buffalo Calves on Infusion of HSS, Flunixin Meglumine & Blood  [PDF]
J. P. Singh, D. V. Singh
Journal of Biomedical Science and Engineering (JBiSE) , 2018, DOI: 10.4236/jbise.2018.116011
Abstract: Six apparently healthy male buffalo calves aged between 6 months to one year with body weight range of 70 - 140 Kg were used in the present investigation. One animal was used for pilot trial for this group. Five calves were randomly taken into this group. The Eschrechia coli endotoxin infused i/v @5 mg/kg BW/hr for 3 hours to all the animals caused symptoms of restlessness, respiratory distress, snoring, diarrhea, profuse salivation along with the significant fall in systolic, diastolic, pulse and mean arterial venous pressure, hypoproteinemia at 1, 2 & 3 hour and hypoglycemia at 3rd hour i.e., end of endotoxin infusion. Respiration was increased significantly during endotoxin infusion at 2nd & 3rd hour and even afterwards till the end of the observation period i.e. 7 hrs. The treatment with hypertonic saline solution, flunixin meglumine and blood raised (p < 0.05) the systolic, diastolic, pulse, mean arterial, central venous pressure, plasma total protein, Albumin, Glucose and Creatinine to levels either close to or even higher than the normal pre-infusion levels while hematocrit and hemoglobin increased significantly at 7th hour and at 5th, 6th & 7th hour respectively i.e., till the end of the observation period. There was no significant effect on Central Venous Pressure (CVP) and body temperature as measured from rectum.
Statistical Models for Long-range Forecasting of Southwest Monsoon Rainfall over India Using Step Wise Regression and Neural Network  [PDF]
Ashok Kumar, D. S. Pai, J. V. Singh, Ranjeet Singh, D. R. Sikka
Atmospheric and Climate Sciences (ACS) , 2012, DOI: 10.4236/acs.2012.23029
Abstract: The long-range forecasts (LRF) based on statistical methods for southwest monsoon rainfall over India (ISMR) has been issued by the India Meteorological Department (IMD) for more than 100 years. Many statistical and dynamical models including the operational models of IMD failed to predict the operational models of IMD failed to predict the deficient monsoon years 2002 and 2004 on the earlier occasions and so had happened for monsoon 2009. In this paper a brief of the recent methods being followed for LRF that is 8-parameter and 10-parameter power regression models used from 2003 to 2006 and new statistical ensemble forecasting system are explained. Then the new three stage procedure is explained. In this the most pertinent predictors are selected from the set of all the potential predictors for April, June and July models. The model equations are developed by using the linear regression and neural network techniques based upon training set of the 43 years of data from 1958 to 2000. The skill of the models is evaluated based upon the validation set of 11 years of data from 2001 to 2011, which has shown the high skill on the validation data set. It can be inferred that these models have the potential to provide a prediction of ISMR, which would significantly improve the operational forecast.
A Study of Occupational Stress and Job-Satisfaction in relation to Professional Commitment and Background Factors of Secondary School Teachers
J D Singh
Golden Research Thoughts , 2012, DOI: 10.9780/22315063
Abstract: Stress is omnipresent in our society. It is a condition of strain that has a direct bearing on emotions, thought process and physical conditions of a person. Due to the competitive nature of the job environment, many people are spending their time for job related work purposes resulting ignore the stressor those are influencing their work and life. Usually people are more worry about their outcome of their work that can even affect the way they treat other people and how they communicate with their peers and customers. The skill and expertise of the teacher as a professional who has the vision and wisdom to perceive the future and help the learners prepare for it. Occupational stress is the interaction of the worker and the conditions of work. The quality or effectiveness of teachers is considered to be associated with his satisfaction towards his profession, his satisfaction with his values. Thus, it is clear that an effective and competent teacher will achieve the desired learning outcomes, provided if he satisfied in his profession. This study was conducted to measure the effect of occupational stress and job-satisfaction of secondary school teachers in relation to their professional commitment and certain background factors.
Electronic structure of BaCu$_2$As$_2$ and SrCu$_2$As$_2$: sp-band metals
D. J. Singh
Physics , 2009, DOI: 10.1103/PhysRevB.79.153102
Abstract: The electronic structures of ThCr$_2$Si$_2$ structure BaCu$_2$As$_2$ and SrCu$_2$As$_2$ are investigated using density functional calculations. The Cu $d$ orbitals are located at 3 eV and higher binding energy, and are therefore chemically inert with little contribution near the Fermi energy. These materials are moderate density of states, sp-band metals with large Fermi surfaces and low anisotropy.
Quantum Critical Behavior and Possible Triplet Superconductivity in Electron Doped CoO2 Sheets
D. J. Singh
Physics , 2003, DOI: 10.1103/PhysRevB.68.020503
Abstract: Density functional calculations are used to investigate the doping dependence of the electronic structure and magnetic properties in hexagonal Na$_x$CoO$_2$. The electronic structure is found to be highly two dimensional, even without accounting for the structural changes associated with hydration. At the local spin density approximation level, a weak itinerant ferromagnetic state is predicted for all doping levels in the range $x=0.3$ to $x=0.7$, with competing but weaker itinerant antiferromagnetic solutions. The Fermi surface, as expected, consists of simple rounded hexagonal cylinders, with additional small pockets depending on the $c$ lattice parameter. Comparison with experiment implies substantial magnetic quantum fluctuations. Based on the Fermi surface size and the ferromagnetic tendency of this material,it is speculated that a triplet superconducting state analogous to that in Sr$_2$RuO$_4$ may exist here.
Electronic structure and bond competition in the polar magnet PbVO$_3$
D. J. Singh
Physics , 2005, DOI: 10.1103/PhysRevB.73.094102
Abstract: Density functional electronic structure studies of tetragonal PbVO$_3$ are reported. The results show a an important role for both Pb 6$p$ - O 2$p$ and V $d$ - O $p$ bonding, with an interplay between these. This is discussed in relation to the possibility of obtaining magnetoelectric behavior.
Properties of KCo$_2$As$_2$ and Alloys with Fe and Ru: Density Functional Calculations
D. J. Singh
Physics , 2009, DOI: 10.1103/PhysRevB.79.174520
Abstract: Electronic structure calculations are presented for KCo$_2$As$_2$ and alloys with KFe$_2$As$_2$ and KRu$_2$As$_2$. These materials show electronic structures characteristic of coherent alloys, with a similar Fermi surface structure to that of the Fe-based superconductors, when the $d$ electron count is near six per transition metal. However, they are less magnetic than the corresponding Fe compounds. These results are discussed in relation to superconductivity.
Electronic Structure and Doping in BaFe$_2$As$_2$ and LiFeAs: Density Functional Calculations
D. J. Singh
Physics , 2008, DOI: 10.1103/PhysRevB.78.094511
Abstract: We report density functional calculations of the electronic structure and Fermi surface of the BaFe$_2$As$_2$ and LiFeAs phases including doping via the virtual crystal approximation. The results show that contrary to a rigid band picture, the density of states at the Fermi energy is only weakly doping dependent and that the main effect of doping is a change in the relative sizes of the electron and hole Fermi surfaces as required by Luttinger's theory. This is a consequence of a change in As height with doping, in particular a shift of As towards Fe as holes are introduced in the Fe plane, as might be expected from simple ionic considerations. The main effect of doping is therefore a reduction in the degree of nesting of the Fermi surface. This provides a framework for understanding the approximate electron-hole symmetry in the phase diagrams of the Fe-As based superconductors.
Electronic Structure of Fe-Based Superconductors
D. J. Singh
Physics , 2009, DOI: 10.1016/j.physc.2009.03.035
Abstract: The electronic structure of the Fe-based superconductors is discussed, mainly from the point of view of first principles calculations in relation to experimental data. Comparisons and contrasts with cuprates are made. The problem of reconciling experiments indicating an $s$ symmetry gap with experiments indicating line nodes is discussed and a possible resolution is given.
On kinetic energy stabilized superconductivity in cuprates
D. J. Singh
Physics , 2006, DOI: 10.1103/PhysRevB.75.012501
Abstract: The possibility of kinetic energy driven superconductivity in cuprates as was recently found in the $tJ$ model is discussed. We argue that the violation of the virial theorem implied by this result is serious and means that the description of superconductivity within the $tJ$ model is pathological.
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