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Search Results: 1 - 10 of 401132 matches for " M Nandi "
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A goal programming approach to rubber plantation planning in Tripura
N. Sen,M. Nandi
Applied Mathematical Sciences , 2012,
Abstract:
Magnetic and magnetocaloric properties of quasi-one-dimensional Ising spin chain CoV$_{2}$O$_{6}$
M. Nandi,P. Mandal
Physics , 2015,
Abstract: We have investigated the magnetic and magnetocaloric properties of antiferromagnetic Ising spin chain CoV$_{2}$O$_{6}$ by magnetization and heat capacity measurements. Both monoclinic $\alpha$-CoV$_{2}$O$_{6}$ and triclinic $\gamma$-CoV$_{2}$O$_{6}$ exhibit field-induced metamagnetic transition from antiferromagnetic to ferromagnetic state via an intermediate ferrimagnetic state with 1/3 magnetization plateau. Due to this field-induced metamagnetic transition, these systems show large conventional and inverse magnetocaloric effects. In $\alpha$-CoV$_{2}$O$_{6}$, we observe field-induced complex magnetic phases at low temperature when the field is applied along $c$ axis and multiple field-induced magnetization plateaux below a certain critical temperature $\sim$ 6 K. Four critical fields and three critical temperatures have been identified in this system. Specific heat and magnetization measurements clearly indicate the difference in nature of transitions from antiferromagnetic to paramagnetic and ferrimagnetic to paramagnetic state in $\alpha$ phase. Due to the large magnetic entropy change and adiabatic temperature change at low or moderate applied magnetic field, $\gamma$-CoV$_{2}$O$_{6}$ can be considered for magnetic refrigerant in the low-temperature region.
Field induced metamagnetic transitions in quasi-one-dimensional Ising spin chain CoV$_{2}$O$_{6}$
M. Nandi,P. Mandal
Physics , 2015,
Abstract: We have investigated the temperature and magnetic field dependence of magnetization ($M$), specific heat ($C_p$), and relative sample length change ($\Delta L/L_0$) for understanding the field-induced metamagnetic transitions in quasi-one-dimensional monoclinic ($\alpha$ phase) and triclinic ($\gamma$ phase) CoV$_2$O$_6$ spin chains. With the application of external magnetic field, a sharp peak emerges in $C_p$($T$) below $T_N$$=$15 K in $\alpha$ phase and a hump-like feature appears above $T_N$$=$6.5 K in $\gamma$ phase due to the field-induced ferrimagnetic and ferromagnetic transitions, respectively. Strong field dependence of linear thermal expansion and large positive magnetostriction have been observed in $\alpha$ phase. Though magnetization data indicate strong spin-orbit coupling for both phases, other measurements show that this effect is very weak for the $\gamma$ phase.
Role of Ion-Surface Interaction at the Entry Surface on the Energy Loss of Highly Charged Slow Ions in Solids  [PDF]
Tapan Nandi
Open Journal of Microphysics (OJM) , 2011, DOI: 10.4236/ojm.2011.13009
Abstract: Evidence is obtained from the data of an earlier measurement that the effect of ion-surface interaction on the stopping power of highly charged slow ions is not at all tiny rather remarkably large, even it supersedes the bulk stopping power. The stopping power due to the surface interactions is directly proportional to the charge state of incident ions.
Trade and Women Employment in China: An Insight into the Low Presence of Women Workforce in the 21st Century Corporate China  [PDF]
Anirban Nandi
Open Journal of Business and Management (OJBM) , 2019, DOI: 10.4236/ojbm.2019.71005
Abstract:
As China enjoys being the second largest economy in the world, it’s women can said to have the credit for its country’s economic development in this 21st century. This paper studies the women employment factor in China and identifies the issue of lower female workforce in Chinese businesses despite of Chinese women, from various walks of life excelling in the corporate world, and studies their income and the employment discrimination faced by them. This research takes a correlation methodology approach to establish the cause of such lower women presence in the Chinese businesses. The study uses re-gression analysis to establish the relationships between the women employed in Chinese businesses and the success rate of those businesses. The rate of discrimination against women in employment by viz. family, male peers and company officials is also being determined. The research concludes with women’s significance in big Chinese corporate giants highlighting their con-tribution towards them through continued presence, the need of increasing female income and bringing in a level playing field for women through equal opportunity policies, the future prediction on the rate of firm profits and the need for further research on the broader aspects of the issue specific to the topic in concern.
Kala-azar presenting as isolated cervical lymphadenopathy in an HIV-infected child
M Nandi, S Sarkar, R Mondal
South African Journal of Child Health , 2012,
Abstract: We describe the case of a 6-year-old boy presenting only with cervical lymphadenopathy as a manifestation of kala-azar without evidence of any other visceral involvement. Involvement of lymph nodes in Indian kala-azar is quite rare with only a few case reports in published literature. The boy was known to be HIV-positive for 1 year before presentation. Immunodeficiency due to HIV infection could have resulted in unusual manifestation of kala-azar.
Characterization of Ciprofloxacin resistant Extended Spectrum β-Lactamase (ESBL) producing Escherichia spp. from clinical waste water in Bangladesh  [PDF]
Nihad Adnan, Munawar Sultana, Ovinu Kibria Islam, Shuvro Prokash Nandi, M. Anwar Hossain
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.47A2003
Abstract: Clinical Waste Water (CWW) possesses the risks of spreading antibiotic resistant bacteria in the environment. In Bangladesh, liquid discharge is directly released into the municipal sewage system and pollutes the surroundings water bodies/rivers. Liquid samples were collected from the three CWW discharge sites connected to DMCH (Dhaka Medical College Hospital) and from one control group non-connected to DMCH. About 32, 30 and 26 times higher ciprofloxacin, cefixime and multi-drug resistant bacterial count were found in CWW over control samples. Among the isolates, two Escherichia spp. isolates, denoted 26N and 28N, were found to be resistant against fluoroquinolone (MBC of Ciprofloxacin > 1024 μg/ml), cephalosporin, glycopeptide, monobactam, penicillin, tetracycline, rifampicin, macrolides, sulfonamide and nitrofuran classes of drugs and were also ESBL positive through phenotypic assay. Plasmid curing experiment detected possible plasmid mediated resistance of fluoroquinolone, cephalosporin, tetracycline, lincosamide and nitrofuran classes of antibiotics. Phylogenetically, isolate 26N and 28N were characterized as Escherichia coli and Escherichia fergusonii. These MDR and ESBL positive bacteria are potent to disseminate resistant determinants in the surrounding environments.
Incorporation of surface correction and anharmonic correction to vacancy formation energy for nickel and copper: bridging the gap between Density Functional Theory and experiment
Prithwish K. Nandi,M. C. Valsakumar
Physics , 2011,
Abstract: Density functional theory (DFT) has been used to estimate vacancy formation enthalpy (H_fv) for a few transition metals like nickel (Ni) and copper (Cu). It is shown that, for these metals, H_fv is underestimated considerably by DFT. The aim of the present work is to bridge the gap between the estimates made by DFT calculations and experiments. The sources of this discrepancy are identified as to be related to the opening up of the surface like region surrounding the vacancy, and the temperature induced anharmonic contribution. The surface related correction to H_fv has been estimated by a jellium based model originally proposed by Mattsson et al. [Phys. Rev. B 73 (2006) 195123] and subsequently modified by Nandi et al. [J. Phys.:Cond. Matt. 22 (2010) 345501]. In this paper, we have estimated the temperature induced anharmonic contribution to H_fv using density functional perturbation theory. Finally, it is shown that incorporation of both the surface correction and anharmonic correction to H_fv, results in a better agreement with the experimental data.
Solution Independent Analysis of Black Hole Entropy in Brick Wall Model
M. Kenmoku,K. K. Nandi,K. Shigemoto
Physics , 2005, DOI: 10.1088/0264-9381/22/19/008
Abstract: Using the brick wall regularization of 't Hooft, the entropy of non-extreme and extreme black holes is investigated in a general static, spherically symmetric spacetime. We classify the singularity in the entropy by introducing a {\it new} index $\delta $ with respect to the brick wall cut-off $\epsilon $. The leading contribution to entropy for non-extreme case $(\delta \neq 0)$ is shown to satisfy the area law with quadratic divergence with respect to the invariant cut-off $\epsilon_{{\rm inv}}$ while the extreme case $(\delta =0)$ exhibits logarithmic divergence or constant value with respect to $\epsilon $. The general formula is applied to Reissner-Nordstr\"{o}m, dilaton and brane-world black holes and we obtain consistent results.
Comparison of theoretical proteomes: Identification of COGs with conserved and variable pI within the multimodal pI distribution
Soumyadeep Nandi, Nipun Mehra, Andrew M Lynn, Alok Bhattacharya
BMC Genomics , 2005, DOI: 10.1186/1471-2164-6-116
Abstract: The distribution of ortholog pI values showed trimodal distributions for all prokaryotic genomes analyzed, similar to whole proteome plots. Pairwise analysis of pI variation show that a few COGs are conserved within, but most vary between, the acidic and basic regions of the distribution, while molecular mass is more highly conserved. At the level of functional grouping of orthologs, five groups vary significantly from the population of orthologs, which is attributed to either conservation at the level of sequences or a bias for either positively or negatively charged residues contributing to the function. Individual COGs conserved in both the acidic and basic regions of the trimodal distribution are identified, and orthologs that best represent the variation in levels of the acidic and basic regions are listed.The analysis of pI distribution by using orthologs provides a basis for resolution of theoretical proteome comparison at the level of individual proteins. Orthologs identified that significantly vary between the major acidic and basic regions maybe used as representative of the variation of the entire proteome.A protein's Isoelectric point (pI) – the pH at which a protein has no net charge – is the basis for its isolation using isoelectric focussing and along with Molecular Mass (Mr) is exploited in two dimensional gel electrophoresis used to seperate a cell's protein content. Bjellquist [1,2] has shown that a the pI of a denatured linear protein can be calculated with high accuracy using the pK values of the amino acids responsible for charge. Using these calculations, it is posible to create an image of an organisms theoretical proteome, by plotting the theoretical pI against their theoretical Mr. The distribution of pI in these plots have a multimodal distribution. Early results on bacteria demonstrated a bimodal distribution with peaks centered around pH 5.5 and pH 9 [3]. This bimodality was explained as being caused by the fact that as proteins are least
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