one-pot preparation of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles has been conducted in the presence of poly(4-vinylpyridinium butane sulfonic acid) hydrogen sulfate, p(4vpbsa)hso4, as an efficient dual acidic catalyst under solvent-free conditions. reusability of the catalyst, easy work-up procedure, eco-friendly reaction conditions, short reaction times and high yields of th...

This paper presents environment friendly refrigerant R290 as a solution to the environmental concerns like depletion of ozone layer and rise in global warming because of wide use of synthetic refrigerants R22 and R134a. The water cooler is the widely used refrigeration application in warm climatic countries. Refrigerant R22 and R134a are predominantly used refrigerants in water cooler refrigera...

This paper proposes a user-friendly framework for designing robot behaviors by users with minimal understanding of programming. It is a step towards an end-user platform which is meant to be used by domain specialists for creating social scenarios, i.e. scenarios in which not high precision of movement is needed but frequent redesign of the robot behavior is a necessity. We show by a hand shaki...

Physically-active and sedentary behaviors are determinants of adult weight gain and are associated with built-environment attributes. We reviewed recent evidence on built-environment attributes with adult adiposity. Of 41 relevant papers identified, 34 reported cross-sectional, six recorded prospective findings, and one included both cross-sectional and prospective designs. In 15 cross-sectiona...

We report a novel approach for the temperature-triggered development of water-soluble photoresists based on photocleavable poly(N-isopropylacrylamide) copolymers. These copolymers are soluble in an aqueous environment below their Lower Critical Solution Temperature (LCST). Upon UV irradiation, the photocleavable groups are deprotected resulting in an increased LCST. Thus, the illuminated parts ...

A major problem in supporting multimedia streaming in the Internet is that the streaming protocol used tends to take bandwidth away from competing TCP traffic streams. Thus it is important to devise rate based protocols that are TCP -friendly. In the paper we examine the effectiveness of two important models in devising TCPfriendly rate based protocols in lossy environment such as wireless netw...

The contribution is dealing with design, developing and implementation of userfriendly environment for standalone micro-controllers especially for Risc PIC family of Microchip micro-controllers. The Reason of decision of this implementation is easy. Users can use for programming micro-controllers only difficult language Assembler or some expensive supporting C compilers. This paper offers solvi...