Warped compactification on curved manifolds

The characterization of a six- (or seven)-dimensional internal manifold with metric as having positive, zero or negative curvature is expected to be an important aspect of warped compactifications in supergravity. In this context, Douglas and Kallosh recently pointed out that a compact internal space with negative curvature could help to construct four-dimensional de Sitter solutions only if the extra dimensions are strongly warped or there are large stringy corrections. That is, the problem of finding 4-dimensional de Sitter solutions is well posed, if all extra dimensions are physically compact, which is called a no-go theorem. Here, we show that the above conclusion does not extend to a general class of warped compactifications in classical supergravity that allow a non-compact direction or cosmological solutions for which the internal space is asymptotic to a cone over a product of compact Einstein spaces or spheres. For clarity, we present classical solutions that compactify higher-dimensional spacetime to produce a Robertson--Walker universe with de Sitter-type expansion plus one extra non-compact direction. Such models are found to admit both an effective four-dimensional Newton constant that remains finite and a normalizable zero-mode graviton wavefunction. We also exhibit the possibility of obtaining 4D de Sitter solutions by including the effect of fluxes (p-form field strengths).Comment: 24 pages, 1 figure; v5 significant changes in the presentation, published (journal) versio

Prescribing patterns in patients with chronic liver and kidney disease in a tertiary care hospital

Background: Liver diseases are major cause of mortality and morbidity worldwide. It is the 12th leading cause of death liver diseases can be classified as acute if the onset of symptom does not exceed six months or chronic if symptoms persist beyond this period. According to the recently available World Health Organization. The aim of study is to facilitate rational use of medicines. Methods: This study is a prospective, observational, single center study which include patients aged ≥18 years, diagnosis of liver diseases with or without co-morbidities and is conducted at out-patient of Medicine department, Rajindra Medical College and Hospital, Patiala. Results: In this study, total of 97 prescriptions of patients with liver disease were analyzed. Out of 97 patients, the majority of patients were male. In ALD, males were 32 (78%) whereas female were 9 (22%) while in CLD males were 47 (84%) and females were 9 (16%).While observing the LFT profile of patients with ALD common tests were observed which includes total bilirubin (1.82±2.42), SGOT (96.81±117.49) and SGPT (94.78±142.94) and in patients with CLD common tests were observed which includes total bilirubin (2.50±3.63), SGOT (67.50±43.04), SGPT (47.10±33.12), blood urea (46.92±24.14) and alkaline phosphatase (147.02±63.14). Conclusions: The study interprets the prescribing pattern of drugs used in patients with ALD and CLD and observed that vitamins and minerals and antibiotics were the most prescribed in order to avoid further complications followed by hepatoprotective agents, antiulcer drugs, antihypertensives and laxatives.

Completely localized gravity with higher curvature terms

In the intersecting braneworld models, higher curvature corrections to the Einstein action are necessary to provide a non-trivial geometry (brane tension) at the brane junctions. By introducing such terms in a Gauss-Bonnet form, we give an effective description of localized gravity on the singular delta-function branes. There exists a non-vanishing brane tension at the four-dimensional brane intersection of two 4-branes. Importantly, we give explicit expressions of the graviton propagator and show that the Randall-Sundrum single-brane model with a Gauss-Bonnet term in the bulk correctly gives a massless graviton on the brane as for the RS model. We explore some crucial features of completely localized gravity in the solitonic braneworld solutions obtained with a choice (\xi=1) of solutions. The no-go theorem known for Einstein's theory may not apply to the \xi=1 solution. As complementary discussions, we provide an effective description of the power-law corrections to Newtonian gravity on the branes or at the common intersection thereof.Comment: 19 pages, LaTeX, Revised/Published Versio

Late-time Cosmic Dynamics from M-theory

We consider the behaviour of the cosmological acceleration for time-dependent hyperbolic and flux compactifications of M-theory, with an exponential potential. For flat and closed cosmologies it is seen that a positive acceleration is always transient for both compactifications. For open cosmologies, both compactifications can give at late times periods of positive acceleration. As a function of proper time this acceleration has a power law decay and can be either positive, negative or oscillatory.Comment: 10 pages, LaTeX, 2 figure

Evolution of Berry Phase and Half-Metallicity in Cr2_2Te3_3 in Response to Strain, Filling, Thickness, and Surface Termination

Cr$_2$Te$_3$ is a ferromagnetic, quasi-two-dimensional layered material with perpendicular magnetic anisotropy, strong spin-orbit coupling, and non-trivial band topology. The non-trivial topology results in an intrinsic anomalous Hall conductivity (AHC) that switches sign under filling and biaxial strain. Thin films can exhibit half metallicity. Using density functional theory combined with maximally localized Wannier functions, we reveal the physical origins of the sensitivity of the sign of the AHC to strain and filling, and we determine the effect of surface termination on the half metallicity. We find that thin films terminated on the Te layers are the most energetically stable, but only the thin films terminated on both sides with the partially occupied Cr layers are half metals. In bulk Cr$_2$Te$_3$, the sensitivity of the sign of the AHC to strain and filling results from the complex Fermi surface comprised of three bands. Filling of local minima and bands near anti-crossings alters the local Berry curvature consistent with the negative to positive switching of the AHC. Similarly, strain depopulates a local minimum, shifts a degenerate point closer to the Fermi energy, and causes two spin-orbit split bands to reverse their order. These findings provide a physical understanding of the evolution of the Berry phase, AHC, and half-metallicity in Cr$_2$Te$_3$.Comment: 14 pages, 11 figure

Effect of Different Spacing and Mulching on Growth and Yield of Okra (Abelmoschus Esculentus L.) in Chitwan, Nepal

Okra (Abelmoschus esculentus L.) is one of the most important vegetable crop of Nepal. Its yield and growth parameters are affected by different cultural practices. This study was conducted at Olericulture Farm of Agriculture and Forestry University, Rampur, Chitwan, Nepal during April 29 to July 9 of 2018. The field experiment was carried out in split plot design using three replications. The treatments consisted of three intra row spacing (30, 45 and 60 cm) and four different mulching materials (Silver plastic, Panicum repens, Lantana camara and bare soil). The objective of this experiment was to assess the effects of various intra-row spacings and mulching materials on growth and yield of okra. The effect of mulching materials on okra yield was found significant. The okra yield was highest (8104 kg/ha) under silver plastic mulch followed by control (5161kg/ha), Panicum repens (3901kg/ha) and Lantana camera (3701kg/ha), respectively. Silver plastic mulch enhanced the growth parameters like canopy length, plant height, leaf number, leaf length, girth and yield of okra. The spacings provided non significant effect on okra yield, however the yield of okra was highest (7295 kg/ha) under 30×30 cm spacing followed by 45×30 cm (4660 kg/ha) and 60 cm × 30 cm spacing (3703 kg/ha), respectively. Combination of silver plastic mulch along with 30 cm × 30 cm spacing provided the highest okra yield. This study suggests that farmers of the Chitwan should grow okra at spacing of 30 cm × 30 cm and under silver plastic mulch to produce higher yield

Student’s perceptions and feedback about teaching-learning pharmacology in Nepalgunj Medical College of Chisapani, Nepal

Background: Pharmacology, being both basic and applied science, forms the backbone of rational therapeutics in medical field. Understanding of current perceptions and opinions of medical students is important for the betterment of teaching-learning methodologies in pharmacology subject. This study done with the objective to determine the perception and feedback of teaching learning pharmacology.Methods: Descriptive cross sectional questionnaire based study was conducted in Nepalgunj Medical College Chisapani, Banke Nepal, among second year MBBS students in September 2017. A questionnaire distributed in class and then collected. Data was analysed using the Statistical Package for Social Sciences (SPSS).Results: Total 119 students, 78 male and 41 females participated in this study. The percentage average of agreed responses for 15 questions (58.92±19.53) was significant (p <0.05) when compared with the percentage average of the disagreed (5.42± 5.17). Seventy three (61.3%) students agreed that pharmacology is a favourite subject but the preferences for pharmacology as a subject in post-graduation was low (18.5%). High proportion of students wanted the faculty members to make more use of Audio-Visual aids 93.3%, case based learning 96.6%, more clinical pharmacology, 97.5%, group discussions, 88.2%, integration to clinical sciences 92.4% and 82.4% prefer MCQs to be introduced in the curriculum for effective learning.Conclusions: Introduction of integrated teaching, MCQs, case based, and group based discussion with clinical pharmacology and audio-visual aids was favoured by majority of the students. Regular reviewing perception and feedback of the students help teachers to plan the curriculum and improve the teaching methodologies

On-farm IPM of chickpea in Nepal dissemination, adoption and promotion, 1997-2005

Chickpea is an important winter grain legume grown in the rice and maize-based systems in the Terai and inner Terai regions of Nepal. In spite of several chickpea varieties and production technologies recommended to farmers in the past, farmer adoption has not been encouraging. To promote better adoption, Integrated Crop Management (ICM) technologies of chickpea were introduced in potential production pockets in the Terai/inner Terai region. On-farm ICM research was initiated jointly by NARC and ICRISAT with DFID funds in 110 farmers 'fields in 1998/99. On the basis of encouraging results obtained in the first year, the project activities were extended to other districts subsequently. By 2004, ICM technologies were disseminated to 20 Terai districts. The ICM package consisted of high yielding disease-tolerant varieties, recommended dose of fertilizers, seed dressing with fungicides and need based foliar application of insecticides and fungicides. Results of the research indicate that ICM packages gave two to three-fold yield increase in chickpea, thereby reducing the unit cost of production and enhancing the incomes of poor and marginal farmers. Study on impact assessment of on-farm ICM research conducted in Banke, Bardia, Sarlahi and Mahottari districts reveals that adoption of the ICM package has substantially enhanced family income, increased dietary intake of chickpea among poor families and increased farmers' ability to spend on education, health and other household activities. A total of 12000 farmers from 20 Terai districts have been educated about ICM, and some of them are involved in seed production and seed business activities, providing more long-term sustainability. Scaling-up of ICM technology is suggested

Bi2Te1.6S1.4 - a Topological Insulator in the Tetradymite Family

We describe the crystal growth, crystal structure, and basic electrical properties of Bi2Te1.6S1.4, which incorporates both S and Te in its Tetradymite quintuple layers in the motif -[Te0.8S0.2]-Bi-S-Bi-[Te0.8S0.2]-. This material differs from other Tetradymites studied as topological insulators due to the increased ionic character that arises from its significant S content. Bi2Te1.6S1.4 forms high quality crystals from the melt and is the S-rich limit of the ternary Bi-Te-S {\gamma}-Tetradymite phase at the melting point. The native material is n-type with a low resistivity; Sb substitution, with adjustment of the Te to S ratio, results in a crossover to p-type and resistive behavior at low temperatures. Angle resolved photoemission study shows that topological surface states are present, with the Dirac point more exposed than it is in Bi2Te3 and similar to that seen in Bi2Te2Se. Single crystal structure determination indicates that the S in the outer chalcogen layers is closer to the Bi than the Te, and therefore that the layers supporting the surface states are corrugated on the atomic scale.Comment: To be published in Physical Review B Rapid Communications 16 douuble spaced pages. 4 figures 1 tabl