We propose a novel memory configuration using tunable barrier and estimate its frequency response to engineer ever fast and robust nonvolatile memory devices. A quantum-classical approach proves that the lifetime of t...
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We use a lattice-Boltzmann based Brownian dynamics simulation to investigate the elongation of DNA at a convergent stagnation point trapped by a uniform attractive potential. The trapping rate of the DNA is not sensit...
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We use a lattice-Boltzmann based Brownian dynamics simulation to investigate the elongation of DNA at a convergent stagnation point trapped by a uniform attractive potential. The trapping rate of the DNA is not sensitive to the potential and, consistent with a mean field theory, scales as the Peclet number, Pe1∕3. Surprisingly, we find that the coiled state is favored over the stretched state at high Pe. The final elongation is determined by conformation changes during transport to the stagnation point, rather than hydrodynamic stretching at that point.
This paper introduces a fully integrated millimeter scale power source based on a micro-silicon fuel cell and a MEMS hydrogen generator. The integrated devices are fabricated from silicon wafers using conventional MEM...
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Globalization will require production of engineers with not only technical but also foreign language competence. We describe a new summer program at a French engineering school, CPE-Lyon, which provides both French la...
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We present a new type of a fast MEMS Gas Chromatography (GC) system that integrates five microvalves and microcolumn for rapid detection of species for a flame ionization detector (FID). The integrated GC samples mixe...
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Application of polymer scaling to the problem of Tolman’s length, a curvature correction coefficient in the interfacial tension, shows that Tolman’s length in polymer solutions may become as large as half of the thi...
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Application of polymer scaling to the problem of Tolman’s length, a curvature correction coefficient in the interfacial tension, shows that Tolman’s length in polymer solutions may become as large as half of the thickness of the interface. Tolman’s length depends on the degree of polymerization N and the distance to the critical point of phase separation, ΔT̂. In the “critical” regime (N1/2|ΔT̂|⪡1) Tolman’s length diverges upon approach to the critical temperature as ∼N0.348|ΔT̂|−0.304. In the “polymer” regime (N1/2|ΔT̂|⪢1) Tolman’s length does not depend on N, but diverges more strongly, as ∼|ΔT̂|−1, proportional to the thickness of the interface.
The protein 3D structure for CGTase G1 was determined by homology modeling and a good structure was generated after three rounds of energy minimization process. The ERRAT and Verify 3D scores for the predicted structu...
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In this study, supercritical carbon dioxide (scCO2) deposition was used to prepare vulcan-supported Pt (Pt/Vulcan) electrocatalysts for proton exchange membrane fuel cells (PEMFCs), and the effects of process variable...
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In this study, supercritical carbon dioxide (scCO2) deposition was used to prepare vulcan-supported Pt (Pt/Vulcan) electrocatalysts for proton exchange membrane fuel cells (PEMFCs), and the effects of process variables on the properties of the electrocatalysts were investigated. The two different methods used to reduce the organometallic precursor were thermal reduction in nitrogen at atmospheric pressure and thermal reduction in scCO2. In the former method, the maximum Pt loading achieved was 9%, and this was governed by the adsorption isotherm of the Pt precursor between the scCO2 phase and the Vulcan phase. By using the latter method, higher Pt loadings of 15% and 35% could be achieved. The Pt/Vulcan catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and cyclic voltammetry (CV). The average particle sizes for Pt/Vulcan 9%, 15%, and 35% catalysts were 1.2, 1.3, and 2 nm, respectively. Electrochemical surface areas obtained from CV data were found to vary with the Pt loading.
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