A Second Look at Single Photon Production in S+Au Collisions at 200 A⋅\cdotGeV and Implications for Quark Hadron Phase Transition

We reanalyze the production of single photons in S+Au collisions at CERN SPS to investigate: i) the consequences of using a much richer equation of state for hadrons than the one used in an earlier study by us; and, ii) to see if the recent estimates of photon production in quark-matter (at two loop level) by Aurenche et al. are consistent with the upper limit of the photon production measured by the WA80 experiment. We find that the measured upper limit is consistent with a quark hadron phase transition. The measured upper limit is also consistent with a scenario where no phase transition takes place, but where the hadronic matter reaches a density of several hadrons per unit volume; which is rather unphysical.Comment: 10 pages, including 3 figures; Submitted to Euro. Phys. Jour.

Capillary Force in High Aspect-Ratio Micropillar Arrays

High aspect-ratio (HAR) micropillar arrays are important for many applications including, mechanical sensors and actuators, tunable wetting surfaces and substrates for living cell studies. However, due to their mechanical compliance and large surface area, the micropillars are susceptible to deformation due to surface forces, such as adhesive force and capillary force. In this thesis we have explored the capillary force driven mechanical instability of HAR micropillar arrays. We have shown that when a liquid is evaporated off the micropillar arrays, the pillars bend and cluster together due to a much smaller capillary meniscus interaction force while still surrounded by a continuous liquid body, rather than due to often reported Laplace pressure difference because of isolated capillary bridges. We have studied both theoretically and experimentally, the capillary force induced clustering behavior of micropillar arrays as a function of their elastic modulus. To this end, we have developed a modified replica molding process to fabricate a wide range of hydrogel micropillar arrays, whose elastic modulus in the wet state could be tuned by simply varying the hydrogel monomer composition. By minimizing the sum of capillary meniscus interaction energy and bending energy of the pillars in a cluster, we have derived a critical micropillar cluster size, which is inversely proportional to elastic modulus of micropillars. The estimated cluster size as a function of elastic modulus agrees well with our experimental observation. We have also explored the utility of the clustered micropillar arrays as ultrathin whitening layers mimicking the structural whitening mechanism found in some insects in nature. Finally, we have theoretically studied the capillary force induced imbibition of a liquid droplet on a model rough surface consisting of micropillar arrays. Our theoretical model suggests that due to shrinking liquid droplet, the imbibition dynamics does not follow the diffusive Washburn dynamics but progressively becomes slower with time

Role of Agile Methods in Global Software Development

Currently software companies are developing the software applications that are developed by global software development teams. In order to develop the quality and cost effective software applications, companies are trying to adopt new methodologies for the global software development. Using of agile in global software development industry yielded benefits and challenges too. The researchers show that agile has many benefits in the software development and fewer complications. But suggesting the agile software development to the global projects is more challenging. This paper focuses on presenting the benefits and challenges in adopting the agile in global software development projects

Simple Unequal Allocation Procedure for Ranked Set Sampling with Skew Distributions

A practical unbalanced Ranked Set Sampling (RSS) model is proposed to estimate the population mean of positively skewed distributions. The gains in the relative precisions of the population mean based on the proposed model for chosen distributions are uniformly higher than those based on balanced RSS and the t-model proposed in Kaur et al. (1997). The relative precisions of the simple unequal allocation model are, with one exception, better than (s, t)-model which is better than t-model. The relative precision of the proposed model is very close or equal to the optimal Neyman allocation model

Surface Tension of Solutions of Chlorides, Bromides & Iodides of Na & K & of Tetraalkylammonium Iodides in Nonaqueous Solvents of High Dielectric Constants

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Ohioensins: A Potential Therapeutic Drug for Curing Diseases

Benzonaphthoxanthenones are a class of flavanoids which are absent in the liverworts and hornworts and present only in the mosses. Ohioensins are benzonaphthoxanthenones which are isolated from various moss species. First compound of this series was isolated from the Polytrichum ohioense Renauld & Cardot. and hence named as Ohioensin A. Together with Ohioensin A, there are 10 other Ohioensins (B–H) and their derivatives have been extracted from different species of mosses. These compounds are pharmaceutically very important and various studies have shown their usefulness as antioxidant, in Atherosclerosis and cytotoxic activities against various human tumor cell lines. In this chapter, synthesis of Ohioensins, their structure and potential medicinal uses are discussed

Structural Changes and Ferroelectric Properties of BiFeO₃-PbTiO₃ Thin Films Grown via a Chemical Multilayer Deposition Method

Thin films of (1-x)BiFeO3-xPbTiO3 (BF-xPT) with x ~ 0.60 were fabricated on Pt/Si substrates by chemical solution deposition of precursor BF and PT layers alternately in three different multilayer configurations. These multilayer deposited precursor films upon annealing at 700{\deg}C in nitrogen show pure perovskite phase formation. In contrast to the equilibrium tetragonal structure for the overall molar composition of BF:PT::40:60, we find monoclinic structured BF-xPT phase of MA type. Piezo-force microscopy confirmed ferroelectric switching in the films and revealed different normal and lateral domain distributions in the samples. Room temperature electrical measurements show good quality ferroelectric hysteresis loops with remanent polarization, Pr, of up to 18 {\mu}C/cm2 and leakage currents as low as 10-7 A/cm2.Comment: 14 Pages and 6 figure