排序方式: 共有43条查询结果,搜索用时 18 毫秒
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Liu Zhu Sun Wen-Yang Fan Xiao-Gang Wang Dong Ye Liu 《International Journal of Theoretical Physics》2021,60(7):2412-2422
International Journal of Theoretical Physics - In this paper, we investigate Einstein-Podolsky-Rosen steering, Bell non-locality, first-order coherence and concurrence in the spin- $\frac {1}{2}$... 相似文献
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利用聚乙二醇(PEG,相对分子质量2 000)与对羟基苯丙酸(DAT)的酯化反应得到凝胶因子,在辣根过氧化物酶(HRP)和过氧化氢催化体系的作用下,制备了一种新型的能快速固化的可注射型水凝胶。研究了HRP、凝胶因子和过氧化氢浓度对凝胶时间的影响,结果表明,当凝胶因子浓度高、HRP浓度高、过氧化氢浓度较低时,凝胶时间较短,最短可在3 s内凝胶。采用红外光谱和核磁共振氢谱对凝胶因子的结构进行了表征,并提出了HRP/H2O2酶促催化下凝胶因子的自由基聚合机理。 相似文献
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Athinodoros Bandis Paul T. Inglefield Alan A. Jones Wen-Yang Wen 《Journal of Polymer Science.Polymer Physics》1995,33(10):1505-1514
The self-diffusion coefficients of toluene in polyisobutylene have been analyzed using the Vrentas-Duda free volume diffusion model. The diffusion coefficients were determined at different temperatures and concentrations, using the pulsed field gradient nuclear magnetic resonance technique. The data were satisfactorily described by the model and the size of the polymer jumping unit was extracted. Comparisons were made with the Fujita free volume theory and the Fujita free volume parameters were extracted from the Vrentas-Duda free volume parameters. From the diffusion data that now available, it can be concluded that for most polymers the jumping unit is about 1.5 times the polymer monomer molecular weight. The activation energy of the toluene diffusion in polyisobutylene is compared with the activation energies of other penetrants in the same polymer. The diffusion data presented in this work show that the energy per mole required to overcome the attractive forces which constrain a diffusing species to its neighbors should be considered to be zero, in order to be able to extract the free volume parameters (from viscosity and diffusion data) with an acceptable uncertainty. ©1995 John Wiley & Sons, Inc. 相似文献
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Wen-Yang Chang Te-Hua Fang Yu-Cheng Lin 《Applied Physics A: Materials Science & Processing》2008,92(3):693-701
Physical characteristics of polyimide films, including optical, micro/nano mechanical, and thermophysical characteristics
were investigated using a photometric, a nanoindentation, and a thermomechanical analyzer for applications in flexible sensors.
Experimental results show that UV light cannot transmit into the polyimide films. The transmittances, with a maximum of about
86%, at VIS and near IR lights decrease with increasing PI film thicknesses. The mechanical characteristics were determined
using tensile, bending moment, and nanoindentation testing. The stress–strain curve approximated bilinear characteristics,
the load–unload bending moment exhibited hysteresis, and nanoindentation generated elastic energy dissipation in the loading–unloading
region. Nanoindentation showed an almost uniform hardness and a reduced Young’s modulus of about 0.181±0.03 and 3.21±0.06 GPa,
respectively, when the penetrating depth was more than about 2 μm. Thermophysical characteristics were greatly influenced
on 8.3 and 25 μm specimens due to the higher relaxation of thin PI films. The thermal expansion remained steady when the thickness
was over 50 μm. The results show that PI films have potential in flexible sensing and higher temperature fabrication. 相似文献
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Recalculations of the Gurney free-energy parameters Aij based on the cosphereoverlap model of Friedman and co-workers have been made using more recent experimental data. Our procedure for calculation seems to be more systematic than those previously reported. The excess energy, entropy, and volume parameters (Eij, TSij, and Vij) were also recalculated for some aqueous tetraalkylammonium halides. In addition, the excess-heat-capacity parameters Cij are also reported here for the first time. These data are discussed briefly in terms of the structural implications. 相似文献