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1 INTRODUCTION The polymeric metal complexes with extended structures are of great interest because of their useful chemical or physical properties[1]. Due to the noti- ceable fact that the aromatic polycarboxylate can provide versatile coordination mode and the non- coplanar structure of carboxylate groups and benze- ne rings, a lot of efforts in this field have been parti- cularly directed to the preparation of aromatic poly- carboxylate (such as phthalate, terephthalate and isophthalat… 相似文献
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Direct transition of potential of water droplets to electric energy using aligned single-walled carbon nanotubes 下载免费PDF全文
In this paper, we report that an electromotive force (EMF)
can be induced in a rope of aligned single-walled carbon nanotubes
(SWNTs) when water droplets fall on this rope. The magnitude of this
EMF depends sensitively on the slant angle of the SWNTs. Most
interestingly, both the magnitude and the direction of the induced
EFM can be modulated by applying a current to the SWNTs. The
concepts of electrical slip and no-slip are proposed and can be
quantitatively described by ``electrical slip resistance'. This
kind of generator does not need any magnet, rotor, {etc} and shows
quite a different operating mechanism and design compared with a
conventional large scale hydroelectric power generator. 相似文献
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在A356铝合金中添加少量Y作为合金的细化剂,同时结合自制变频控制的电磁搅拌设备对合金进行短时弱电磁搅拌。分析了电磁频率对A356-Y合金初生α相形貌和尺寸的影响;并利用背散射电子像,探讨了不同电磁频率对半固态A356-Y合金铸锭径向上稀土元素分布的影响。研究表明:液态A356-Y合金经620℃低过热度浇铸,并在频率为30 Hz的条件下搅拌15 s,于590℃保温5 min后,其初生α相的形貌和尺寸达到最佳,其中心部区域晶粒平均等积圆直径为64.95μm,平均形状因子为0.80;边缘区域晶粒的平均等积圆直径为58.97μm,平均形状因子达到0.83。铸锭径向上的区域不均匀性和稀土元素呈靠近模壁含量越高的分布规律,与电流频率、化合物密度、受力等因素相关。 相似文献
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Co-phasing between different sub-apertures is important for sparse optical synthetic aperture telescope systems to achieve high-resolution imaging.For co-phasing detection in such a system,a new aspect of the system’s far-field interferometry is analysed and used to construct a novel method to detect piston errors.An optical setup is built to demonstrate the efficacy of this method.Experimental results show that the relative differences between measurements by this method and the criterion are less than 4%,and their residual detecting errors are about 0.01 λ for different piston errors,which makes the use of co-phasing detection within such a system promising. 相似文献
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近年来, 二维材料特别是二维过渡金属硫属化合物材料作为一个新兴研究领域引起了人们极大的兴趣, 它们也被认为是基于石墨烯电子器件的补充材料. 过渡金属硫属化合物之所以能引起人们强烈的兴趣, 在于它们奇特的性质以及其在催化, 能量存贮, 电子, 光电等领域的广泛应用. 自2007年开始, 双电层离子液体晶体管技术被广泛的应用于有机和无机材料包括过渡金属硫属化合物材料以修饰或者调控这类材料的电性质. 基于这种双电层晶体管技术, 材料的迁移率, 操作电压等被进一步改善, 绝缘-金属相变, 超导甚至是铁磁性质也被实现. 本工作将综述双电层离子液体晶体管技术对二维材料的调控性能和简要展望其今后的发展方向. 相似文献
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Observation of Weak Anti-Localization and Electron-Electron Interaction on Few-Layer 1T′-MoTe_2 Thin Films 下载免费PDF全文
Electronic transports of few-layer 1T'-MoTe_2 films are measured at temperatures down to 0.26 K. The lowtemperature conductivity exhibits logarithmic temperature dependence and negative magneto response. The negative magnetoconductivity can be well fitted by the two-dimensional weak anti-localization theory taking a single channel of electrons into account, with the parameters α≈-0.5 and l_φ∝ T~(-0 5). The logarithmic temperature dependence has a positive slope κ≈0.75, indicating the dominance of electron-electron interaction over the weak anti-localization effect, with an apparently negative Coulomb screening factor F that demands future work for clarification. 相似文献
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