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排序方式: 共有87条查询结果,搜索用时 15 毫秒
1.
Seghir K. Cristoloveanu S. Jerisian R. Oualid J. Auberton-Herve A.-J. 《Electron Devices, IEEE Transactions on》1993,40(6):1104-1111
The leakage and charge pumping currents were measured in gate-controlled MOS p-i-n diodes fabricated on thin SIMOX substrates. The efficiencies of the techniques as well as their complementary features are analyzed for various experimental conditions. The interface properties of device-grade SIMOX wafers are characterized and shown to be compatible with VLSI requirements. Special interface coupling effects, which occur only in fully depleted SOI devices and modify the conventional signature of charge pumping and leakage current, are thoroughly investigated 相似文献
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Dipl.-Ing. Thomas Klein Salar Niknafs Rian Dippenaar Helmut Clemens Svea Mayer 《BHM Berg- und Hüttenm?nnische Monatshefte》2014,159(7):289-290
Solid-state phase transformations and grain growth of an intermetallic γ-TiAl alloy were investigated in-situ using high-temperature laser scanning confocal microscopy (HTLSCM). During isothermal annealing in the single β-phase region, significant grain coarsening was observed. On cooling beneath the β-transus temperature with different rates, a CCT diagram was evaluated for the initiation of β to α phase transformation and changes in the morphology were observed. 相似文献
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Mingdong Li Rian You George W. Mulholland Michael R. Zachariah 《Aerosol science and technology》2014,48(1):22-30
For a nonspherical particle, a standard differential mobility analyzer (DMA) measurement yields a mobility-equivalent spherical diameter, but provides no information about the degree of sphericity. However, given that the electrical mobility for nonspheres is orientation-dependent, and that orientation can be manipulated using electric fields of varying strength, one can, in principle, extract some type of shape information through a systematic measurement of mobility as a function of particle orientation. Here, we describe the development of a pulsed-field differential mobility analyzer (PFDMA) which enables one to change the peak E-field experienced by the particle to induce orientation, while still maintaining the same time-averaged field strength as a standard DMA experiment. The instrument is validated with polystyrene latex (PSL) spheres with accurately known size, and gold rods with dimensions accurately determined by transmission electron microscopy (TEM). We demonstrate how the instrument can be used for particle separation and extraction of shape information. In particular, we show how one can extract both length and diameter information for rod-like particles. This generic approach can be used to obtain dynamic shape factors or other multivariate dimensional information (e.g., length and diameter).
Copyright 2014 American Association for Aerosol Research 相似文献
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基于体素S因子计算个体化病例的三维剂量是目前核医学研究的一个重要方向.153Sm是目前骨转移治疗常用的核素之一.本文利用EGS4蒙特卡罗程序包构建了基于体素的三维吸收剂量分布模拟程序,计算了不同情况下153Sm的S因子,探讨了介质成分和物理密度对S因子的影响.结果表明:1)不同物理密度对S因子有明显影响;2)在相同物理密度的情况下,不同介质对S因子的影响相对较小.计算结果为基于体素S因子计算核素治疗的三维剂量提供了参考,明确了在不考虑介质和物理密度差异时S因子的误差. 相似文献
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A device based on an electrochemical transfer junction (constituted by MxMo6S8 or MxMo6Se8) placed between two tanks allows the transfer of cations by application of current density controlled between electrodes placed in tanks. The transfer protocol was tested on different mixed electrolytes containing cations directly engaged in the batteries industry (M2+ = Co2+, Ni2+, Cd2+, Zn2+, Mn2+, Cu2+). Good performances of the process are provided until 1.6 mA cm−2. The electrolysis through an electrochemical transfer junction made of Chevrel phases represents a suitable method for the selective extraction of cations with appreciable selectivity rates with an appropriate choice of the host lattice (sulfide or selenide). Remarkable separations between Co/Ni, Zn/Mn with Mo6S8 and Cd/Zn, Cd/Ni, Cd/Co and Zn/Ni, with Mo6Se8 were observed. 相似文献
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This study reports a new method of producing high-purity monoacylglycerols (MAGs) by glycerolysis of fully hydrogenated palm oil (FHPO) catalyzed by hydrotalcite loaded with K2CO3 (K2CO3/HT). The effects of reaction temperature, reaction time, catalyst (K2CO3/HT) loading, and mass ratio of FHPO to glycerol on glycerolysis were investigated. The selected conditions included a reaction temperature of 200°C, K2CO3/HT loading at 0.8 wt.% (FHPO mass), a 5:2 mass ratio of FHPO to glycerol, and a reaction time of 2 h. Under these selected conditions, the yield of MAGs in the acylglycerol phase reached 46.8 wt.%. A two-stage molecular distillation was introduced to purify MAGs, and the final MAG product was obtained with a purity of 96.6 wt.% and a recovery of 96.8%. Furthermore, the recycled K2CO3/HT was reactivated with restored catalytic efficiency through impregnation, carbonation, and recalcination. 相似文献