Calibration Estimation for Ratio Estimators in Stratified Sampling for Proportion Allocation

Calibration has established itself as an important methodological instrument in large scale production of statistics. In this paper, we propose calibration estimation for ratio estimator in stratified sampling and derive the estimator of the variance of the calibration estimation ratio estimator in stratified sampling in case proportion allocation

Poincare covariant mechanics on noncommutative space

The Dirac approach to constrained systems can be adapted to construct relativistic invariant theories on a noncommutative (NC) space. As an example, we propose and discuss relativistic invariant NC particle coupled to electromagnetic field by means of the standard term $A^\mu\dot x_\mu$. Poincare invariance implies deformation of the free particle NC algebra in the interaction theory. The corresponding corrections survive in the nonrelativistic limit.Comment: 7 pages, JHEP style, final versio

Diagnostic SWOT appraisal of the wicker handicraft entrepreneurship development in Kashmir, India

Critical analyses of the perceptions on SWOT (strengths, weaknesses, opportunities and threats) have become a fundamental element of multi-criteria decision making for developing wicker handicraft entrepreneurship. The study examined the effectiveness and prioritization of entrepreneur's perceptions towards SWOT categories and factors and provided insights for developing wicker handicraft entrepreneurship in Pulwama district of Kashmir. Data were collected through structured interviews and focus group discussions of 100 wicker handicraft entrepreneurs of 20 villages selected by multi-stage random sampling. Simple descriptive statistics were used for the data analysis. Results showed that the factors like income generation (19.30%) and employment generation (19.00%) were viewed as most important strengths while labour intensive and less remunerative livelihood (18.80%) and seasonal subsistence (18.70%) were identified as main weaknesses. Further, poverty alleviation (20.70%), preservation of traditional art craft (19.00%) and improvement in public-private relations (17.50%) were adjudged as strong opportunities whereas limited marketing facilities (20.70%), lack of co-operative societies (18.90%) and harassment by officials in withies collection (16.50%) were seen as chief threats. The challenges (weaknesses and threats) (50.40%) for wicker handicraft entrepreneurship outweighed the prospects (strengths and opportunities) (49.60%) while the internal factors (strengths and weaknesses) (54.80%) prevailed over the external factors (opportunities and threats) (54.20%). F statistics (p<0.05) indicated significant differences between the internal factors (strengths and weaknesses) and external factors (opportunities and threats). The results projected the basis to the policymakers to prioritize and address the prominent challenges and reinforce the prospects for conceptualizing, formulating and implementing the strategies for strengthening the wicker handicraft entrepreneurship

Non-commutativity and Open Strings Dynamics in Melvin Universes

We compute the Moyal phase factor for open strings ending on D3-branes wrapping a NSNS Melvin universe in a decoupling limit explicitly using world sheet formalism in cylindrical coordinates.Comment: 12 pages, 1 figure, references adde

On the consistency of the three-dimensional noncommutative supersymmetric Yang-Mills theory

We study the one-loop quantum corrections to the U(N) noncommutative supersymmetric Yang-Mills theory in three spacetime dimensions (NCSYM$_3$). We show that the cancellation of the dangerous UV/IR infrared divergences only takes place in the fundamental representation of the gauge group. Furthermore, in the one-loop approximation, the would be subleading UV and UV/IR infrared divergences are shown to vanish.Comment: 8 pages and 2 figure

Atorvastatin treatment softens human red blood cells: An optical tweezers study

Optical tweezers are proven indispensable single-cell micro-manipulation and mechanical phenotyping tools. In this study, we have used optical tweezers for measuring the viscoelastic properties of human red blood cells (RBCs). Comparison of the viscoelastic features of the healthy fresh and atorvastatin treated cells revealed that the drug softens the cells. Using a simple modeling approach, we proposed a molecular model that explains the drug-induced softening of the RBC membrane. Our results suggest that direct interactions between the drug and cytoskeletal components underlie the drug-induced softening of the cells. © 2018 Optical Society of America

Semi-classical Probe Strings on Giant Gravitons Backgrounds

In the first part of this paper we study two $Z_2$ symmetries of the LLM metric, both of which exchange black and white regions. One of them which can be interpreted as the particle-hole symmetry is the symmetry of the whole supergravity solution while the second one is just the symmetry of the metric and changes the sign of the fivefrom flux. In the second part of the paper we use closed string probes and their semi-classical analysis to compare the two 1/2 BPS deformations of $AdS_5\times S^5$, the smooth LLM geometry which contains localized giant gravitons and the superstar case which is a solution with naked singularity corresponding to smeared giants. We discuss the realization of the $Z_2$ symmetry in the semi-classical closed string probes point of view.Comment: 29 pages, 6 .eps figures; v2: References adde

On the invariance under area preserving diffeomorphisms of noncommutative Yang-Mills theory in two dimensions

We present an investigation on the invariance properties of noncommutative Yang-Mills theory in two dimensions under area preserving diffeomorphisms. Stimulated by recent remarks by Ambjorn, Dubin and Makeenko who found a breaking of such an invariance, we confirm both on a fairly general ground and by means of perturbative analytical and numerical calculations that indeed invariance under area preserving diffeomorphisms is lost. However a remnant survives, namely invariance under linear unimodular tranformations.Comment: LaTeX JHEP style, 16 pages, 2 figure

One Loop Renormalizability of Spontaneously Broken Gauge Theory with a Product of Gauge Groups on Noncommutative Spacetime: the U(1) x U(1) Case

A generalization of the standard electroweak model to noncommutative spacetime would involve a product gauge group which is spontaneously broken. Gauge interactions in terms of physical gauge bosons are canonical with respect to massless gauge bosons as required by the exact gauge symmetry, but not so with respect to massive ones; and furthermore they are generally asymmetric in the two sets of gauge bosons. On noncommutative spacetime this already occurs for the simplest model of U(1) x U(1). We examine whether the above feature in gauge interactions can be perturbatively maintained in this model. We show by a complete one loop analysis that all ultraviolet divergences are removable with a few renormalization constants in a way consistent with the above structure.Comment: 24 pages, figures using axodraw; version 2: a new ref item [4] added to cite efforts to all orders, typos fixed and minor rewordin