CommunityPVR: A Service to Deliver the Long Tail for On-Demand TV

CommunityPVR is a software service that executes on the STB devices in a service provider's IP network. CommunityPVR forms a P2P network among set-top boxes to provide a resilient streaming service that can exponentially increase the choice of available shows.     

Unexpected formation of dihaloplatinum(II) and platinum(IV) complexes in the reaction of [PtMe2(bu2bpy)] with 1,2-dibromotetrachloroethane: Crystal structure of trans-[PtMe2BrCl(bu2bpy)]

The platinum(II) complex [PtMe₂(bu₂bpy)] (bu₂bpy = 4,4′-di-tert-butyl-2,2′-bipyridine) (1) reacted with 1,2-dibromotetrachloroethane in a 2:1 mole ratio of Pt(II): (CBrCl₂)₂ to afford trans-[PtMe₂BrCl(bu₂bpy)] (2) and [PtCl₂(bu₂bpy)] (3). The ¹H NMR spectroscopy shows that the Pt–Me bond cleavage is mainly involved after a fast oxidative addition reaction. Complex trans-[PtMe₂BrCl(bu₂bpy)] (2) has been characterized by X-ray diffraction which shows that platinum adopts an octahedral geometry.     

Some New Heterocyclic Sulphonates with potential antimicrobial activity

4-(Phenylhydrazono-4′-benzenesulphonato)-3-methyl-2-pyrazolin-5-one ( 2 ) was prepared by treating 4-(4′-hydroxyphenylhydrazono)-3-methyl-2-pyrazolin-5-one ( 1 ) with benzenesulphonyl chloride. Heating 2 with acetic anhydride, chloroacetyl chloride and benzenesulphonyl chloride afforded the N-acetyl ( 3 ), N-chloroacetyl ( 4 ) and O-benzenesulphonyl ( 5 ) derivatives, respectively. 2 reacted with benzenesulphonyl chloride under cooling conditions to give the N-benzenesulphonyl derivative ( 6 ). 2 undergoes Mannich reaction to give the N-Mannich base ( 7 ). Reaction of 2 with formaldehyde in methanol afforded the N-hydroxymethyl derivative ( 8 ) which undergoes condensation with ethyl acetoacetate, ethyl cyanoacetate and malononitrile to give compounds 9 , 10 and 11 respectively. The antimicrobial activity of these products against gram-positive (+ve), gram-negative (−ve) bacteria and fungi was screened. They showed potential bactericidal activity and some of them exhibited high fungicidal activity.     

Characterization of reinforcing effect of alumina nanoparticles on the novolac phenolic resin

Very fine alumina nanoparticles were loaded in novolac type phenolic resin (PF) using solution mixing method. The concentration of nanoalumina in PF was varied between 2.5 to 20 wt%. All the compounds were compression molded and then subjected to scanning electron microscopy (SEM), tensile, flexural, and dynamic mechanical analysis (DMA) tests. SEM analysis showed that the nanoalumina were dispersed uniformly at low concentrations, however, at high concentrations, dispersion was suppressed leading to agglomerates in the composites. Mechanical testing revealed that the nanoalumina had a great influence on the strength and stiffness of PF resin particularly at concentrations below 5 wt%. However, at concentration above 5 wt%, the stress concentrations were developed because of the formation of big aggregates that results in strength reduction. Theoretical analyses based on Pukanszky and micromechanical models of tensile modulus revealed that strong interfacial interaction and thick interphase region around the alumina nanoparticles is formed. DMA results suggested that the nanoalumina increased the crosslinking density of the PF resin, possibly around the interface region. It was also postulated that an apparent percolation state is established above 5 wt% loading of nanoalumina in which interphase region comes to contact before direct contact of particle leading to continuous interphase region. POLYM. COMPOS., 35:1285–1293, 2014. © 2013 Society of Plastics Engineers