OALib Journal期刊

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匹配条件: “Purbasha Banerjee” ,找到相关结果约2173条。
Study on avifaunal diversity from three different regions of North Bengal, India
Utpal Singha Roy,Purbasha Banerjee,S. K. Mukhopadhyay
Asian Journal of Conservation Biology , 2012,
Abstract: A rapid avifaunal diversity assessment was carried out at three different locations of north Bengal viz. Gorumara National Park (GNP), Buxa Tiger Reserve (BTR) (Jayanti/Jainty range) and Rasik Beel Wetland Complex (RBWC) during 2nd November and 14th November 2008. A total of 117 bird species belonging to 42 families were recorded during the present short span study. The highest bird diversity was recorded in GNP with 87 bird species, followed by RBWC (75) and BTR (68). The transition zones between GNP and BTR, BTR and RBWC and GNP and RBWC were represented by 51, 41 and 57 common bird species, respectively. A total of 36 bird species were recorded in all three study sites. This diverse distribution of bird species was reflected in the study of diversity indices where the highest Shannon–Wiener diversity index score of 3.86 was recorded from GNP followed by RBWC (3.64) and BTR (2.84). The similar trend was also observed for Simpson’s Dominance Index, Pielou’s Evenness Index and Margalef’s Richness Index. Consequently in the dendrogram analysis, we found that GNP and RBWC were much closer to each other while BTR remained distantly located form this cluster. The present study recorded two birds viz. Black-naped oriole (Oriolus chinensis) and Marshall’s iora (Aegithina nigrolutea) previously not reported from the present study location. Like other protected areas of the country the present study location is also facing conservation challenges and more intensive studies will certainly reveal the impact of anthropogenic alteration of the habitats in and around the present study location along with the enrichment of knowledge for the avifaunal diversity.
Impact of Climate Variability on Yield of Spring Wheat in North Dakota  [PDF]
Ganesh C. Bora, Sukhwinder Bali, Purbasha Mistry
American Journal of Climate Change (AJCC) , 2014, DOI: 10.4236/ajcc.2014.34032
Abstract: Agricultural production is highly dependent on the climatic variability of the specific regions. Differential climatic and soil conditions bring about changes in yield, quality of crops thus affecting the economy. This study evaluated the impact of variability in different climatic factors keeping the other factors constant on spring wheat production in North Dakota from 2007 to 2011. The spring wheat yield mainly depends on the climatic changes during growing periods April to September. Average maximum air temperature was significantly different from April to September except June from 2007 to 2011. High average minimum and maximum air temperatures during planting time increase yield and planting area for 2010. In 2011, low mean soil temperature, excess rainfall in April caused low yield of spring wheat. The unmitigated climate variability will result in declines in yields. So, adoption of sustainable agriculture practices helps the farmers to develop the different practices for their farms.
Inelastic collisions of optically trapped metastable calcium atoms
Purbasha Halder,Hannes Winter,Andreas Hemmerich
Physics , 2013, DOI: 10.1103/PhysRevA.88.063639
Abstract: We study binary collisions of metastable calcium atoms ($^{40}$Ca) in an optical dipole trap. Collisions between $^{3}$P$_{0}$-atoms and between $^{3}$P$_{0}$ and $^{1}$S$_{0}$-atoms are considered. In the former case, the elastic and inelastic collision parameters are found to be $5.4\times 10^{-11}\,\mathrm{cm}^{3}\mathrm{s}^{-1}$ and $3.6\times 10^{-11}\,\mathrm{cm}^{3}\mathrm{s}^{-1}$, respectively. A fraction of the collisions between $^{3}$P$_{0}$-atoms is found to produce cold trapped atoms in the singlet $^{1}$S$_{0}$ state, suggesting that the internal energy for these collisions is dissipated by radiation. For collisions between $^{3}$P$_{0}$ and $^{1}$S$_{0}$-atoms we find a two-body loss parameter of $8.5\times 10^{-11}\,\mathrm{cm}^{3}\mathrm{s}^{-1}$. Our observations show that metastable calcium samples in the $^{3}$P$_{0}$-state are not stable at high densities, as for example required in quantum computing or many-body quantum simulation schemes.
The Role of Magnesium in Superalloys—A Review  [PDF]
Kumkum Banerjee
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.29168
Abstract: The role of magnesium (Mg) in improving the high temperature mechanical properties of the superalloys, like creep, fatigue, tensile ductility, impact toughness etc. have been vividly studied by several authors. On the other hand, very few authors have contradicted the view of any beneficial effect of Mg on the mechanical properties. This review presents a summary of the open literature related to the effect of Mg on the microstructure and mechanical properties of superalloys and from which further metallurgical research on the unexamined topics are proposed.
On the Theory of Topological Computation in the Lowest Landau Level of QHE  [PDF]
Dipti Banerjee
Journal of Quantum Information Science (JQIS) , 2011, DOI: 10.4236/jqis.2011.13017
Abstract: We have studied the formation of Hall-qubit in lowest Landau level of (LLL) Quantum Hall effect due to the Aharonov-Bhom oscillation of quasiparticles.The spin echo method plays the key role in the topological entanglement of qubits. The proper ratio of fluxes for maximally entangling qubits has also been pointed out. The generation of higher Quantum Hall state may be possible with the help of quantum teleportation.
Modeling Stress Intensity Factor of Rail Steel under Situation of Growing Fatigue Crack—A Novel Technique  [PDF]
Upamanyu Banerjee
Open Journal of Metal (OJMetal) , 2012, DOI: 10.4236/ojmetal.2012.23011
Abstract: Simulation of stress intensity factor as function of rolling contact fatigue cracks of railway tracks and the vehicle load is made with the help of COMSOL Multiphysics software. It is found that the critical stress intensity factor i.e. 41.6 MPa. m1/2 is reached at a stress level of 32 MPa and at the crack size 11.5 × 10-2 m.Noting the power law variation of acoustic emission count with increase in crack size (analogous to Paris Law), the simulation was further carried out to model the dependence of measured AE count with the stress intensity factor ahead of a growing RCF crack tip. It is demonstrated that AE measurement can be effective to trigger a control loop for avoidance of fatigue failure of railway track. In view of potential difference in the intensity of back scattered light from surface irregularities, a model is developed to find out the threshold intensity of scattered light that insures safety in the railway system against fatigue failure.
Workplace Identities of Women in the US Labor Market  [PDF]
Dina Banerjee
Sociology Mind (SM) , 2013, DOI: 10.4236/sm.2013.31004

In this paper, I examine the effects of gender and race/ethnicity on American workers’ workplace identities. Literature on gender, work, and occupation suggests that gender and race are significant predictors of workers’ workplace identities. Literature also posits that self-perceived competency and reflected appraisals from others in workplaces also contribute considerably to workers’ workplace identities. However, there exists hardly any empirical study that explores the impacts of gender, race, workers’ self-perceived competency, and their reflected appraisals altogether on their workplace identities. That is what I accomplished in this study. Deriving the data from the National Study of Changing Workforce (NSCW: 2008) I ask: 1) Do women and men workers in America differ in their perceptions of workplace identities; 2) Do non-white and white workers in America differ in their perceptions of workplace identities; and 3) Do gender and race of the workers impact their workplace identities when self-perceived competency and reflected appraisals enter the equation? Analyses are based on quantitative methods. Results show that workers’ self-perceived competency and their reflected appraisals are more significant predictors of their workplace identities than gender or race.


A novel route to Bose-Einstein condensation of two-electron atoms
Purbasha Halder,Chih-Yun Yang,Andreas Hemmerich
Physics , 2012, DOI: 10.1103/PhysRevA.85.031603
Abstract: We present a novel route to Bose-Einstein condensation devised for two-electron atoms, which do not admit practicable cooling techniques based upon narrow intercombination lines. A dipole trap for $^{40}$Ca atoms in the singlet ground state is loaded from a moderately cold source of metastable triplet atoms via spatially and energetically selective optical pumping permitting four orders of magnitude increase of the phase space density. Further cooling to quantum degeneracy is achieved by forced evaporation optimized to minimize three-body losses. In a combined loading and evaporation cycle of less than three seconds we are able to condense 3000 atoms.
Audit of Epilepsy Clinics in South East Thames: Are We NICE?  [PDF]
Somnath Banerjee, Sanjay Sahi
Journal of Behavioral and Brain Science (JBBS) , 2011, DOI: 10.4236/jbbs.2011.12010
Abstract: Background: NICE has suggested that paediatric epilepsy services should undergo regular audit. An audit was done to gain a snapshot across South East Thames clinics. Method: Audit in South East Thames was conducted in 2010. Results: In 86.5% seizure classification and in 42.8% a syndromic diagnosis was made. cQT interval was calculated in 10.1% cases and 91.8% had an EEG. In 48.5% adverse effects of drugs were communicated. 41.3% were given information leaflets/directed to the appropriate website. In 70.7% developmental/academic progress was documented. 61% had a written care plan. 70.2% had the copy letter to parents/carers whereas it was sent to School & Child Health in 35.1%. 23.1% had access to specialist epilepsy nurse. Conclusions: This audit was a snapshot. The results showed that the care of children with epilepsy is consistent with the NICE guidelines in many aspects but patchy in the UK.
A Calcified Artery of Drummond, Could It Be a Sentinel Sign of Further Complications?  [PDF]
Shahe Boghossian, Arpan Banerjee
Surgical Science (SS) , 2012, DOI: 10.4236/ss.2012.39091
Abstract: Objective: To understand the role of the artery of Drummond in the elderly population. The artery plays a crucial role in the anastamosis between the inferior mesenteric artery and superior mesenteric artery. Its maintenance is particularly important for the survivability of the bowel in events of stenosis of either one of the native arteries; SMA or IMA. Method: A 94 year old lady presents with post-prandial abdominal pain and significant emaciation. The patient undergoes clinical and radiological investigations to find out the cause of her ailments. Results: Abdominal X-ray revealed a serpentine structure that was later defined as the artery of Drummond, CT scan revealed a calcified and enlarged artery of Drummond in addition to an occluded origin of SMA and celiac artery as well as a severe stenosis origin of IMA. Conclusion: The artery of Drummond was immensely hypertrophied and was supplying the entire bowel through the native IMA; subsequent occlusion of the IMA was the main cause that caused the demise of the patient.

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