Hydride molecules lie at the base of interstellar chemistry, but synthesis sulfuretted hydrides is poorly understood and their abundances often crudely constrained. Motivated by new observations Orion Bar photodissociation region (PDR) – 1? resolution ALMA images SH + ; IRAM 30 m detections bright H 2 32 S, 34 33 S lines; 3 (upper limits); SOFIA/GREAT limits) we perform a systematic study chemi...

The environmentalists of the entire world are crying by forecasting depletion biotic and abiotic resources at an accelerating rate which may make survival life on earth questionable. main cause this disastrous degradation is due to unmindful anthropogenic activities. present generation unaware consequences environmental need for conservation species their habitats. It imperative responsibility ...

We study the collective escape dynamics of a chain of coupled, weakly damped nonlinear oscillators from a metastable state over a barrier when driven by a thermal heat bath in combination with a weak, globally acting periodic perturbation. Optimal parameter choices are identified that lead to a drastic enhancement of escape rates as compared to a pure noise-assisted situation. We elucidate the ...

Valiant (2007) proposed a computational model for evolution and suggested that evolvability be studied in the framework of computational learning theory. Feldman (2008) showed that Valiant’s evolution model is equivalent to the correlational statistical query (CSQ) learning model, which is a restricted setting of the statistical query (SQ) model. Evolvability in Valiant’s model has been shown t...

As traffic levels increase on railways in Britain and elsewhere, improved understanding of the trade-offs between capacity provision/utilisation and service quality is increasingly important, as Infrastructure Managers and Railway Undertakings seek to maximise capacity provision without an unacceptable loss of service reliability and punctuality. This is particularly true of the stations and ju...

Embedded systems usually have strict resource and performance constraints. Designers often need to improve the system design so that the system satisfies those constraints. In such case, performance bottlenecks should be identified and improved effectively. In this paper, we present a method to identify performance bottlenecks. Our method automatically identifies not only the bottlenecks but al...