Brian R. Johnson Design Machine Group, University of Washington [email protected] ABSTRACT Traditional design education relies heavily on passive presence awareness and unfocused interaction. Support for these modes of communication is largely absent from current computing environments. This paper reports on Compadres, a system for support of distributed collaborators through creation of gro...

in this study an easy, green, efficient and simple approach is reported for the synthesis of some benzothiazole-, benzimidazole- and benzoxazole-2-thiolderivatives. the proposed approach employs the reaction of corresponding aromatic amine with potassium isopropyl xanthate (z11) in the presence of copper sulfate (cuso4) as a catalyst under conventional heating and ultrasonic irradiation. the ad...

waterwashing or biodiesel purification is one of the steps in biodiesel fuel processing. waterwashing of the fuel is an indispensable processing stage, due to the presence of impurities in the fuel. in this research work, some of the effective parameters in biodiesel waterwashing and the optimum conditions which lead to economy in time and cost of waterwashing were investigated. the effective p...

regioselective synthesis of highly functionalized pyranopyrazoles was achieved in excellent yield from phenyl pyrazolone, substituted aromatic aldehyde with nitroketene-n,s-acetal in the presence of indium trichloride as a versatile catalyst under reflux condition in ethanol-water mixture. all reactions preceeded within a short period of time with excellent purity. all of the synthesized compou...

In this work a rapid and selective procedure for separation and preconcentration of lead(Pb2+) before determination by electrothermal atomic absorption spectrometry (ETAAS) wasdeveloped. The procedure is based on the electrodeposition on a graphite probe modified withpalladium. The lead was deposited from acetate buffer solution at pH 5.5. Various parameters,such as pH of solutions, deposition ...