The thin gate insulator, consisting of a 10 nm thick silicon oxide layer and a 35 nm thick ferroelectric polymer film, enabled bistable operation at 4 V. Device hysteresis as a function of gate voltage was evident both in the device capacitance, which was measured between the gate and drain, and in the source-drain conductance. The ferroelectric film polarization was not saturated, even up to operating voltages of 10 V. This is likely the reason for the short state retention of less than 10 s at room

temperature. check details The hysteresis vanished as the sample was heated toward the ferroelectric-paraelectric phase transition temperature, showing that the bistability was due to ferroelectric polarization reversal. (c) 2010 American Institute of Physics.[doi:10.1063/1.3437638]“
“Photosensitive polyimide/silica hybrid materials were synthesized by reaction between 4,4′-hexafluoroisopropylidene

diphthalic anhydride (6FDA) and 4,4′-oxydianiline. The intrachain chemical bonding and the interchain hydrogen bonding between the polyimide and silica moieties were increased by the incorporation of 2(dimethylamino) ethyl acrylate and 3-aminopropyl trimetho xysilane, respectively. The photoinitiator was bis(2,4,6-trimethyl benzoyl) phenylphosphine oxide (Irgacure-819). The various coupling agents were utilized included tetrakis (allyloxy) silane (TAL). Most silica hybrid films showed better volume shrinkage and temperature resistance. The cooperation of octavinyl FOSS, as the coupling agent, can lower dielectric constant selleckchem (k) down to 2.48

but with the poorer volume shrinkage and temperature resistance than the other silica hybrid films. The addition of tetramethyl orthosilicate and 3-methacryloxy propyltrimethoxysilane with silica content of 5.6 wt % can reduce k down to 2.26 but with worse volume shrinkage than the incorporation with TAL. The TAL hybrid film with degree of polymerization of 25 showed the best properties that optimized photolithography, dielectric constant (k = 3.81), volume shrinkage, and temperature CHIR-99021 molecular weight resistance (Td5% = 378 degrees C) with only 0.22 wt % silica content. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 117: 2422-2427, 2010″
“Tuberculomas are common forms of central nervous system tuberculosis, presenting as space-occupying-lesions. Brainstem tuberculomas are rare among all intracranial tuberculomas. In old patients, in the absence of tuberculosis history, diagnosis may be challenging. In this case, we present a 70-year-old patient, with bladder cancer, without known tuberculosis who presented with stroke-like symptoms, clinically. Diffusion-weighted imaging revealed no finding of stroke, however, a medulla oblongata tuberculoma, mimicking metastasis was evident on MRI.”
“Rugby Union is one of the most popular sports in Ireland.