Site-resolved Bragg scattering

We numerically calculate the reliability with which one can optically determine the presence or absence of an individual scatterer in a randomly occupied 3D array of well-localized, coherently radiating scatterers. The reliability depends in a complicated way on the ratio of lattice spacing to wavelength and the numerical aperture of the imaging system. The behavior can be qualitatively understood by considering the dependence of Bragg scattering modes on lattice spacing. These results are of interest for atomic implementations of quantum information processing

Topological Insulators and Metals in Atomic Optical Lattices

We propose the realization of topological quantum states with cold atoms trapped in an optical lattice. We discuss an experimental setup that generates a two-dimensional hexagonal lattice in the presence of a light-induced periodic vector potential, which represents a realization of the Haldane model with cold atoms. We determine theoretically the conditions necessary for observing the topological states and show that two of the key conditions are: 1) the realization of sharp boundaries and 2) the minimization of any smoothly varying component of the confining potential. We argue that, unlike their condensed matter counterparts, cold atom topological quantum states can be i) "seen", by mapping out the characteristic chiral edge states, and ii) controlled, by controlling the periodic vector potential and the properties of the confining potential.Comment: 4+ pages, 5 color figure

Simulation for Feeder Protection with Micro-Controller in proteus

Feeder protection is obtained & developed with input sources from both the sides. Micro controller is used for obtaining detection of fault, monitoring and isolation of the feeder. Using micro controller normal and abnormal operation with digital display of parameters is ascertained. Proteus software based PIC micro controller is used for simulation of feeder with single input, double input, over load and trip. Also isolation of the feeder is obtained. Paper suggest successful feeder control with detailed results through micro controller

AUV location detection in an enclosed environment

Normally, experiments are done in a controlled environment so that different systems under test can be isolated. The added benefit is that the sensors used are a lot more accurate under controlled conditions. In the experiments perform on underwater robot localization, this was not the case. The sonar localization equipment use perform flawlessly in open water as it was designed to do, but poorly in an indoor pool. It is believed that the sonar had too much power causing too many reflections in the enclosed space. Unfortunately the experiments are better done in a pool so as to control the elements under test. This paper is the search to improve the equipment\u27s accuracy in an enclosed environment by attempting to reduce the power of the sonar via mechanical means

Field evaluation of biolarvicides in Surat city, India

Background & objectives : Two bacterial larvicide (bio-larvicide) formulations— Bacticide® and VectoBac® containing viable endospores and delta endotoxin of Bacillus thuringiensis var israelensisH-14 were evaluated in 2001 for their mosquito larvicidal efficacy under the operational conditions ofurban malaria control programme in Surat city, India.Methods : Larvicides were applied at the recommended dose in selected breeding habitats of Anopheles(An. stephensi), Aedes (Ae. aegypti) and Culex (Cx. quinquefasciatus) and reductions in thedensities of III and IV instars were compared with that of untreated matched controls.Results : At the construction sites in cemented tanks/chambers VectoBac produced reduction in thedensity of III and IV instar larvae of An. stephensi (98–100%) and Ae. aegypti (100%) in the first weekof application whereas Bacticide produced 71–100% reduction in An. stephensi and 100% in Ae.aegypti. Re-application of VectoBac on Day 10 caused better control up to Day 20 when comparedwith Bacticide. In stagnant water pools, VectoBac produced 27.6–85.3% reduction in the larvae of An.subpictus and 18.5–83.8% in those of Cx. quinquefasciatus whereas Bacticide produced 23.3–30.3%and 39–97.2% reduction in An. subpictus and Cx. quinquefasciatus larval densities in the first weekpost application, respectively. Bacticide application gave better impact on Cx. quinquefasciatuslarvae in the second week after re-application as compared to VectoBac. In storm water drains, Vecto-Bac caused respectively 6.2–100% and 6.4–97.6% reduction in An. subpictus and Cx. quinquefasciatuslarvae in the first week of application whereas Bacticide produced 100% and 13.3–98.8% reductionin An. subpictus and Cx. quinquefasciatus larval densities, respectively.Interpretation & conclusion : Both the formulations were equally effective on An. subpictus and Cx.quinquefasciatus larvae after a second application. The results showed that application of thesebiolarvicides would be required at 7–10 day intervals. The health workers engaged in the applicationof biolarvicides reported a better ease of handling and application of the liquid formulation (VectoBac)than the wettable powder formulation (Bacticide)

Malignant placental trophoblastic tumour a diagnostic dilemma: rare association with focal segmental glomerulonephritis and cardiomyopathy

Placental site trophoblastic tumour (PSTT) is the rarest form of Gestational trophoblastic neoplasia (GTN).It has a wide clinical spectrum of presentation and its complications have a multi organ involvment. Inspite of the advances in HCG assays and sensitive unltrasounds, its diagnosis and course in every case is a mystery. However, it is only rarely associated with glomerulonephritis. Most cases have not been biopsied and the specific nature of renal involvement is not clearly understood. Here we report a case of PSTT with glomerulonephritis and cardiomyopathy

Hall of Mirrors Scattering from an Impurity in a Quantum Wire

This paper develops a scattering theory to examine how point impurities affect transport through quantum wires. While some of our new results apply specifically to hard-walled wires, others--for example, an effective optical theorem for two-dimensional waveguides--are more general. We apply the method of images to the hard-walled guide, explicitly showing how scattering from an impurity affects the wire's conductance. We express the effective cross section of a confined scatterer entirely in terms of the empty waveguide's Green's function, suggesting a way in which to use semiclassical methods to understand transport properties of smooth wires. In addition to predicting some new phenomena, our approach provides a simple physical picture for previously observed effects such as conductance dips and confinement-induced resonances.Comment: 19 pages, 8 figures. Accepted for publication in Physical Review B. Minor additions to text, added reference

Relationship between umblical artery Doppler and perinatal outcomes in Indian women with oligohydramnios

Background: Doppler study of umbilical artery is considered as independent predictor for perinatal adverse outcomes. Similarly oligohydramnios condition is also found to associate with perinatal mortality and morbidity. There is paucity of data regarding the relationship between abnormal Doppler of umblical artery with the perinatal outcomes in Indian subjects having oligohydramnios. Objectives of the study were, this study was done with the primary aim of evaluating any association between Doppler findings of umblical arteries with the adverse perinatal outcomes in Indian subjects having oligohydramnios.Methods: This was an observational study in the Obstetrics and Gynecology Department of a tertiary care hospital. Women who came for antenatal checkup and having oligohydromnios were recruited in the study. Doppler of umblical artery was done and these women followed up till labour. Sociodemographic profile and other prognostic factors were noted in predesigned Performa.Results: There were 56.1% (41 out of 73) outcomes were observed in the normal umblical artery Doppler and 51% (14 out of 27) in abnormal umblical artery Doppler. There was no statistically significant difference in outcomes (p=0.8). There was no significant difference in abnormal Doppler finding between mild and severe oligohydramnios.Conclusions: There is no relationship between abnormal Doppler findings and perinatal adverse events in oligohydramnios. Inherent methodological issues may be the reason for the same

Deep Venous Thrombosis and Pulmonary Thromboembolism in a Physically Nonprepared Trekker in the Himalayas: An Autopsy Report

Deep Venous Thrombosis (DVT) and Subsequent Pulmonary Thromboembolism (PTE) in high altitude climbers is a well-known concept. The acclimatization process at high altitude is itself a thrombogenic event. Accordingly, when a physically nonprepared individual with preexisting thrombogenic risk factors attempts trekking at high altitude, they may end up with fatal thromboembolic events. Here, we report a case of a low-lander with multiple thrombogenic risk factors who developed DVT and PTE when he went for a trekking trip in the Himalayas. The risk factors, autopsy findings, and possible mechanism of developing fatal pulmonary embolism, in this case, are discussed here

ASSOCIATION OF SUBCLINICAL HYPOTHYROIDISM WITH METABOLIC SYNDROME: A CROSSSECTIONAL STUDY FROM WESTERN INDIA

ABSTRACTObjective: Metabolic syndrome (MetS) and subclinical hypothyroidism (SCH) both are known to have adverse cardiovascular outcomes. Availablestudies have shown variable results on the association of SCH with MetS as well as individual components of MetS. We aimed to study the associationof SCH with MetS and its individual components of MetS.Methods: This cross-sectional study was carried out in individuals volunteered for health checkup at tertiary care teaching hospital in Western India.About 60 cases with MetS and 120 controls without having MetS were recruited. Demographic data such as history of diabetes mellitus, hypertension,dyslipidemia, blood pressure (BP), waist circumference and serum T3, serum T4, thyroid stimulating hormone, fasting blood sugar, fasting lipidprofile, and hemoglobin A1c were collected and statistically analyzed. Statistical analysis was done by using SPSS sav software packages. Chi-squaretest was used for the comparison of qualitative data.Results: SCH was present in 52 (28.9%) among 180 study participants. SCH was present in 35 (58.33%) participants having MetS and in 17 (14.16%)of controls. There was a strong association between SCH and MetS (p<0.001). Significant association of SCH with diastolic BP (p=0.017) and withcentral obesity (p=0.004) was observed but not with high-density lipoprotein, triglyceride, hyperglycemia, systolic BP, total cholesterol, and lowdensitylipoprotein.Conclusion: We observed a strong association of SCH with MetS. We also observed significant association of SCH with diastolic BP and with obesity.The finding of this study indicates the need to screen individuals with MetS for SCH.Keywords: Central obesity, Diastolic blood pressure, Hypertriglyceridemia, Hypertension, Cardiovascular morbidity, Inflammation, Insulin resistance,Low-density lipoprotein, High-density lipoprotein.Â