1,121 research outputs found
Lasing in Bose-Fermi mixtures
No full textA.K. acknowledges the support from the EPSRC Established Career Fellowship. V.K., M.D., V.F.S. and A.K. acknowledge support from the Russian Ministry of Science and Education, contract (contract No. 11.G34.31.0067). P.G.S. acknowledges support from Greek GSRT program Aristeia (grant No. 1978). C.S., M. A. J.F., M.K and S.H. acknowledge support from the state of Bavaria.Light amplification by stimulated emission of radiation, well-known for revolutionising photonic science, has been realised primarily in fermionic systems including widely applied diode lasers. The prerequisite for fermionic lasing is the inversion of electronic population, which governs the lasing threshold. More recently, bosonic lasers have also been developed based on Bose-Einstein condensates of exciton-polaritons in semiconductor microcavities. These electrically neutral bosons coexist with charged electrons and holes. In the presence of magnetic fields, the charged particles are bound to their cyclotron orbits, while the neutral exciton-polaritons move freely. We demonstrate how magnetic fields affect dramatically the phase diagram of mixed Bose-Fermi systems, switching between fermionic lasing, incoherent emission and bosonic lasing regimes in planar and pillar microcavities with optical and electrical pumping. We collected and analyzed the data taken on pillar and planar microcavity structures at continuous wave and pulsed optical excitation as well as injecting electrons and holes electronically. Our results evidence the transition from a Bose gas to a Fermi liquid mediated by magnetic fields and light-matter coupling.Peer reviewe
Read Book [PDF] Back from the Dead: Inside the Subhas Bose Mystery Full-Acces
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Factors affecting stunting among 3–12 years old girls of Purba Medinipur, West Bengal, India
No full textStunting is the impaired growth and development in children caused due to poor nutrition, recurrent infections and lack of psychosocial stimulus. Because stunting affects physical development and inhibits the child from attaining his full cognitive development as an adult, children may never regain the height lost due to stunting. Stunting (Low height-for-age) in infants and young children is a simple, wellknown indicator of undernutrition. The current study sought to determine the effects of socio-economic and demographic factors on the frequency of stunting among Bengalee girls. The study was carried out in the Deshopran block and Haldia municipality area (West Bengal, India). The total number of participants included in the study was 530 Bengalee girls. 53.39% (283) of study participants were urban residents while 46.61% (247) were rural residents. Stunted growth in children was defined as the height for a given age in children less than two standard deviations of the WHO Child Growth Standards. The prevalence of stunting among girls in our study was 11.13%. The predictor variables with substantial associations with stunting in the binary logistic regression (BLR) analyses were further used in the multiple binary logistic regression (MBLR) analyses. Odds ratios with 95% confidence intervals were used to calculate the stunting risk. Results showed that the risk of stunting was significantly associated with low birth weight, presence of younger brothers, a large number of family members and place of delivery. Improving maternal and child access to nutrient-rich food, decreasing infectious disease, and promoting women empowerment initiatives are the main recommendations for resolving the issue
Factors associated with low birth weight among tribal and non-tribal population in India: Evidence from National Family Health Survey-4 (2015–2016)
No full textThe tribal population (8.6%) is vulnerable to neonatal mortality and morbidity in India. Birth weight is an important decisive factor for most neonatal survival and postnatal development. The present study aims to compare the prevalence and associations of certain socio-economic, demographic, and lifestyle variables with low birth weight (LBW) among tribal and non-tribal populations in India. The present investigation utilized retrospective data of the National Family Health Survey (NFHS-4, 2015–16) among tribal (N=26635) and non-tribal (N=142162) populations in India. Birth weight variation of the newborn was categorized into LBW (0.01). Higher tribal population concentration (47.0%) areas has a lower (7.4%) prevalence of LBW in the northeast zone, whereas greater non-tribal population concentration (27.1%) areas was found higher in the central zone (19.2%). The BLR analysis showed that rural habitat, lower educational attainment, lack of own sanitary toilet facility, a lower wealth index, absence of electricity, high pollutant fuel exposure, Hindu and Muslim religion, elevated maternal age at first birth, maternal anemia as well as home delivery of newborn have greater odds for LBW (p/p
Three-dimensional structure of quantized vortices in rotating Bose-Einstein condensates
No full textBose-Einstein condensates (BEC) are ideal superfluid systems to realize quantum turbulence (QT): vortex cores in BECs are larger than in superfluid Helium, making easier their observation. Recent experimental and numerical studies reported that vortex states in BEC can evolve towards a turbulent regime when an oscillatory excitation is applied. We discuss in this work how to accurately prepare initial states with vortices before running numerical simulations of QT based on the Gross-Pitaevskii equation. The case of a dense Abrikosov lattice in a fast rotating BEC is presented. High resolution numerical simulations using parallel computing are used to accurately capture physically important features of the vortices (vortex radius, inter-vortex spacing, vortex density profile)
Metabolic Cause of Obesity: The Role of Alanine Transaminase in Increasing BMI, Cholesterol, Blood Pressure and Blood Glucose
No full textComparison of nutritional status between tuberculosis patients and controls: a study from north 24 Parganas District in West Bengal, India
No full textThe nutritional status of tuberculosis patients (TBP) and controls (CT) was compared among adult (> 20 years) Bengalees in Shyamnagar, Barrackpore, Naihati and Jagaddal of North 24 Parganas District, West Bengal, India. The subjects included 310 men (154 TBP and 156 CT) and 246 women (128 TBP and 118 CT). The mean ages of TBP men was 36.4 years (CT = 34.5) and that of TBP women was 26.4 years (CT = 25.6). Variables compared included weight, height, fat mass, fat mass index, mid-upper arm fat area, and skinfolds. Results revealed that TBP had significantly lower means for all variables (except for height in men) compared to CT in both sexes. In men, the highest percent differences between the two groups were observed for fat mass (FM: 60.1%), fat mass index (FMI: 59.2%) and suprailiac skinfold (SUPSF: 58.8%). In women, the highest percent differences between the two groups were observed for SUPSF (59.7), mid-upper arm fat area (MUAFA: 58.1), triceps skinfold (TSF: 51.4), biceps skinfold (BSF: 51.2), FM (51.2) and FMI (49.0). Regression analyses confirmed that tuberculosis status had significant impact (p < 0.0001) on all anthropometric and body composition characteristics compared (except for height in men) in both sexes. Among men, tuberculosis status explained the highest percent variation in percent body fat (PBF: 57.2%), FMI (56.0%) and FM (55.6%). In women, tuberculosis status explained the highest amount of variation in PBF (67.9), TSF (63.5%), BSF (62.8), FMI (61.0) and FM(60.7). Results of contingency chi-square tests revealed that there were significant differences in the frequency of undernutrition between TBP and CT in men (Ï2 = 73.13361) and women (Ï2 = 59.0000). The frequencies of undernutrition were significantly more common among TBP, in both men (56.5%) as well as women (51.6%). This study provided evidence that there was significant differential amount of loss in fat and muscle measures in tuberculosis patients
Bose–Einstein condensation in the Rindler space
No full textAbstractBased on the Unruh effect, we calculate the critical acceleration of the Bose–Einstein condensation in a free complex scalar field at finite density in the Rindler space. Our model corresponds to an ideal gas performing constantly accelerating motion in a Minkowski space–time at zero-temperature, where the gas is composed of the complex scalar particles and it can be thought to be in a thermal-bath with the Unruh temperature. In the accelerating frame, the model will be in the Bose–Einstein condensation state at low acceleration; on the other hand, there will be no condensation at high acceleration by the thermal excitation brought into by the Unruh effect. Our critical acceleration is the one at which the Bose–Einstein condensation begins to appear in the accelerating frame when we decrease the acceleration gradually. To carry out the calculation, we assume that the critical acceleration is much larger than the mass of the particle
Overweight and obesity among adolescent Bengalee boys of Midnapore town, West Bengal
No full textThesis: Ph. D., Vidyasagar University, Department of Anthropology, Midnapore,West Bengal, 2012Overweight and obesity among adolescent Bengalee boys of Midnapore town, West BengalDepartment of Anthropology, Vidyasagar University, Midnapore, Indi
Growth and nutritional status of rural Bengalee pre-school children of Integrated Child Development Service (ICDS) scheme of Chapra block of Nadia district, West Bengal
No full textThesis: Ph. D., Vidyasagar University,Department of Anthropology, Vidyasagar University, Midnapore, West Bengal, India, 2012Growth and nutritional status of rural Bengalee pre-school children of Integrated Child Development Service (ICDS) scheme of Chapra block of Nadia district, West BengalDepartment of Anthropology, Vidyasagar University, Midnapore, West Bengal, Indi
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