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981.
M Liu HY Hwang H Tao AC Strikwerda K Fan GR Keiser AJ Sternbach KG West S Kittiwatanakul J Lu SA Wolf FG Omenetto X Zhang KA Nelson RD Averitt 《Nature》2012,487(7407):345-348
Electron-electron interactions can render an otherwise conducting material insulating, with the insulator-metal phase transition in correlated-electron materials being the canonical macroscopic manifestation of the competition between charge-carrier itinerancy and localization. The transition can arise from underlying microscopic interactions among the charge, lattice, orbital and spin degrees of freedom, the complexity of which leads to multiple phase-transition pathways. For example, in many transition metal oxides, the insulator-metal transition has been achieved with external stimuli, including temperature, light, electric field, mechanical strain or magnetic field. Vanadium dioxide is particularly intriguing because both the lattice and on-site Coulomb repulsion contribute to the insulator-to-metal transition at 340?K (ref. 8). Thus, although the precise microscopic origin of the phase transition remains elusive, vanadium dioxide serves as a testbed for correlated-electron phase-transition dynamics. Here we report the observation of an insulator-metal transition in vanadium dioxide induced by a terahertz electric field. This is achieved using metamaterial-enhanced picosecond, high-field terahertz pulses to reduce the Coulomb-induced potential barrier for carrier transport. A nonlinear metamaterial response is observed through the phase transition, demonstrating that high-field terahertz pulses provide alternative pathways to induce collective electronic and structural rearrangements. The metamaterial resonators play a dual role, providing sub-wavelength field enhancement that locally drives the nonlinear response, and global sensitivity to the local changes, thereby enabling macroscopic observation of the dynamics. This methodology provides a powerful platform to investigate low-energy dynamics in condensed matter and, further, demonstrates that integration of metamaterials with complex matter is a viable pathway to realize functional nonlinear electromagnetic composites. 相似文献
982.
An efficient method was developed for the synthesis of arylidene heterobicyclic 3-cyano-2-pyridones via ytterbium chloride catalyzed tandem condensation of aromatic aldehydes,cyclic ketones,and cyanoacetamide.The conditions and scope of the reaction were investigated and a reaction mechanism was proposed. 相似文献
983.
在研究多输出Boole函数Walsh循环谱的基础上,利用多输出Boole函数的正交性与其坐标函数任意组合函数的平衡性之间的等价关系,证明了一个置换f(x)是正形置换的充要条件是其Walsh循环谱W(f)(α,α)=W(f)(0,α)=0. 相似文献
984.
985.
Strontium was introduced into CeO2–ZrO2 mixed oxides (CZ) by doping and impreg-nation metho ds, and then Pt was impregnated on the Sr-modifie d CZ to obtain the catalysts. X-ray diffraction (XRD), X-photon spectra (XPS), high-resolution transmission electronic microscopy (HRTEM) and H2 temperature programmed reduction (TPR) were carried out to characterize the micro-structure and reducibility of catalysts. The oxygen storage capacity (OSC) was evaluated with CO serving as probe gas. The results showed that the incorporation of Sr2+ in the lattice of CZ could promote the OSC properties by increasing the structure defects and enhancing the diffusion rate of oxygen from bulk to surface. For the Sr-impregnated sample, the strong metal–support interaction (SMSI) between Pt and CZ was interrupted, since Sr covered parti al surface Ce species. Such interruption retarded the back-spillover effect occurring at the Pt/Ce interface at low temperature, resulting in the loss of OSC. Meanwhile, it was found that a part of impregnated Sr2+ could partially diffuse from the surface to the inner atomic layers of CZ and partially incorporated in the lattice during the calcination. The OSC performance of Sr-impregnated sample therefore climbed remarkably with the rise of temperature. 相似文献
986.
987.
介绍模拟电路故障诊断的现状及特点,提出一种基于最小二乘支持向量机的模拟电路故障诊断新方法.该方法可以对模拟电路有效地进行故障诊断,有较高的诊断效率. 相似文献
988.
989.
真三维显示中的片源获取方法 总被引:1,自引:0,他引:1
介绍已制作的真三维显示器,解释基于可视体素的显示技术.针对三维模型的海量数据生成问题,提出基于虚拟结构光的真三维片源获取方法,实现模型的空间数据生成.仿真结果为大型真三维显示器参数设计理论提供依据.实验证明,该方法可为真三维显示提供彩色、高分辨率的片源. 相似文献
990.
樊晓云 《萍乡高等专科学校学报》2012,29(1):32-35
高校行政权力的失控和监督缺位,是导致高校腐败频发的主要原因,高校内部只有形成行政权力、学术权力和监督权力的"三权分立",并保持权力结构的良好平衡,才能够有效防范权力失控问题;通过强化网络监督,引入预防腐败网络监管平台,构建高校信息公开制度,形成高校有效的行政权力监督机制。 相似文献