Bifunctional chiral urea-containing quaternary ammonium salts can be straightforwardly synthesised in good yield and with high structural diversity via a scalable and operationally simple highly telescoped sequence starting from trans-1,2-cyclohexanediamine. These novel hybrid catalysts were systematically investigated for their potential to control glycine Schiff bases in asymmetric addition r...

Although specific object detection has undergone great advances in recent years, its application to critical real-time circumstances like those in automated vehicle controlling is still limited, especially when facing strict speed and precision requirements. This paper uses a hybrid of various computer vision techniques including color space analysis, Haar-wavelet cascade detector, contour anal...

We describe an approach for producing robust multimaterial chalcogenide glass fibers for mid-wave and long-wave mid-infrared transmission. By combining the traditional rod-in-tube process with multimaterial coextrusion, we prepare a hybrid glass-polymer preform that is drawn continuously into a robust step-index fiber with a built-in, thermally compatible polymer jacket. Using tellurium-based c...

In this paper we discuss D-Brane/Antibrane inflation as a concrete example of a bottom-up approach in string cosmology. After introducing the standard cosmology, inflation, we turn to the dynamics of D-branes, and find that an open string mode between the branes becomes tachyonic when the branes get to a critical distance. We then obtain a realization of hybrid inflation with two relevant field...

in this paper, considering the importance of incoming flow turbulence intensity into combustion chamber, tripping wire effect on the flow wake has been experimentally investigated within a linear compressor cascade. to do this, two wires were implemented along each blade and their effects on average velocity, turbulence intensity and vortices frequencies at reynolds number 45500 were accurately...

iran’s vast common natural gas resources and the necessity to extract and export it as liquefied natural gas (lng) to distances more than 3000km opens a lucrative field for researchers to optimize lng cycles. in this article heat integration in cryogenic cycles by determining interacycle partition temperature and optimizing refrigeration features like subcooler, presaturator, aftercooler, reboi...

A complex contagion is an infectious process in which an individual may require multiple transmissions. We typically think of individuals as beginning inactive and becoming active once they are contacted by sufficient numbers of active partners. These have been studied in a number of contexts, but the analytic models for dynamic spread of complex contagions are typically complex. Here we study ...