摘要：The exact solution for the bending problem of a free-end point loaded film- substrate cantilever with arbitrary film-to-substrate thickness ratio is obtained by using the basic mechanical equilibrium equation. And then the problem of design and optimization for microactuator buildup of film-substrate cantilever is discussed by taking into account the effect of geometrical and physical parameters of the cantilever components. Furthermore, the optimal condition for actuator application is presented and some theoretical problems are clarified. The results show that, in general, the greater the film-to-substrate thickness ratio, the higher the ability of taking load, namely the larger the exerted force of the cantilever when the thickness of substrate is kept constant. When the total thickness of the cantilever is kept constant, however, the free-end exerted force will experience a maximum and this maximum value of the exerted force will decrease with the increasing film-to-sub- strate stiffness ratio. Meanwhile, the optimal thickness ratio corresponding to this maximum exerted force also decreases with the increasing stiffness ratio. Whether for the cases of fixed substrate or fixed total thickness, the influence of Poisson’s ratio of two cantilever components on the exerted force is remarkable, and should not be neglected.

摘要：开发高熵硼化物材料的功能特性对于拓宽其在极端环境中的潜在应用至关重要.为此,本文通过调控材料的组分开发出具有高效催化性能的高熵二硼化物(HEB_(2))纳米颗粒:首先基于对HEB_(2)的尺寸差异因子、混合焓以及体系自蔓延燃烧模式的理论分析,我们采用一种简便、快速、低成本的燃烧合成方法合成了6种不同组分的HEB_(2)纳米颗粒;然后,通过对材料的组分进行调控实现了HEB_(2)纳米颗粒活化过硫酸盐降解抗生素的高效催化能力(四环素的最高去除效率可达93.5%).不同吸附位点的吸附能和差分电荷密度的第一性原理计算结果进一步证实了HEB_(2)优异的催化性能主要归因于Ti组元,而非高熵效应.此外,基于检测到的活性氧和计算的反应能垒,我们提出了HEB_(2)活化过硫酸盐降解抗生素的潜在催化机理.本研究不仅为HEB_(2)高效催化降解抗生素的组分设计提供了理论依据,而且显示出HEB_(2)在去除自然水体中新污染物方面的潜在应用前景.

摘要：负泊松比超材料由于其优异的力学性能,包括优异的抗剪切性能、抗冲击性能、抗断裂性能、吸能隔振等,在个体防护和抗冲击、减振吸能等领域有着重要的应用价值,从而引起了科学家和工程师们极大的研究兴趣.大多数传统的负泊松比超材料通常基于单元胞体的拓扑结构设计,这类超材料通常不可避免地面临着由其复杂拓扑结构,特别是内凹多边形结构,所带来的设计、制备难题.迄今为止,尽管许多研究人员致力于开发新的负泊松比超结构和材料,但很少有研究能明确指出负泊松比超材料的设计指南或工作流程,更多的研究是基于研究人员的设计灵感和对特定胞元结构的计算机辅助优化.基于此,我们提出了一种受自然启发的负泊松比超材料设计策略,利用天然多孔材料所具有的独特双梯度结构,例如以松质骨和向日葵茎髓心作为生物模型,通过在多孔结构中引入双梯度变化即可得到负泊松比效应,从而制备负泊松比超材料.这种受自然启发的负泊松比超材料设计思路具有一定的普适性,可以扩展到具有常见凸多边形胞元的多孔结构中,基本胞元结构并不局限于特定的内凹多边形等常见的用来构造负泊松比超材料的结构和形状.

摘要：为多晶硅的生产的各种各样的方法为降低生产费用和精力消费被建议了，并且提高生产率，它为工业应用程序是批评的。使流体化的床化学药品蒸汽免职(FBCVD ) 方法是常规的，而是在在罚款的讨厌的形成的 FBCVD 结果的 silane 的同类的反应的一种很有希望的选择，它将影响产品质量和产量。有一些另外的问题，例如加热由于反应堆和加热器的墙上的不希望得到的多晶硅免职的退化。这篇文章主要为解决上述问题在多晶的硅和研究地位的 FBCVD 上考察工艺的发展。它也鉴别对处理和原则的很多挑战应该在一个 FBCVD 反应堆的设计被跟随。

摘要：Recently, it has been demonstrated that memristors can be utilized as logic operations and memory elements. In this paper, we present a novel circuit design for complementary resistive switch（CRS）-based stateful logic operations. The proposed circuit can automatically write the destructive CRS cells back to the original states. In addition, the circuit can be used in massive passive crossbar arrays which can reduce sneak path current greatly. Moreover, the steps for CRS logic operations using our proposed circuit are reduced compared with previous circuit designs. We validate the effectiveness of our scheme through Hspice simulations on the logic circuits.

摘要：Co87Nb10Zr3,Co76Nb19Zr5,Co64Nb26Zr10 and Co64Nb16Zr20 amorphous films were deposited on noncrystalline glass substrates by DC unbalanced magnetron sputtering. The compositions of amorphous films were tailored in the light of the individual deposition rate of Co,Nb and Zr. The amorphous films with the anticipated composition were prepared by means of co-sputtering Co,Nb and Zr targets simultaneously. It is indicated that there is interaction among three targets during co-sputtering. The morphology and composition of the films were observed by SEM,AFM and EDS. The structure and magnetic property were measured by XRD and physical property measurement system(PPMS) . The coercivity changes with the composition,varying from 240 to 1 600 A/m. After vacuum isothermal annealing at temperatures of 475,500,525 and 550 ℃ for 15 and 30 min,respectively,it is found that high Nb content is beneficial to improving thermal stability of amorphous films. The crystallized films have the mean grain size of 2-19 nm.

摘要：基于导电媒介所构建的具有Z型电荷转移机制的半导体异质结构在实现高效太阳能驱动光催化全分解水方面极具潜力.不同于传统颗粒型异质结构,本文采用具有高可控性的微纳集成手段,在氟掺杂氧化锡(FTO)导电基底上集成了TiO_(2)、Cu_(2)O交替条带平行排列的图案化薄膜光催化材料,该异质结构中形成了TiO_(2)/Cu_(2)O和TiO_(2)/FTO/Cu_(2)O两种接触界面.通过光化学沉积示踪方法研究了光生电荷的跨界面转移机制,结果表明TiO_(2)/Cu_(2)O直接接触界面附近的光生电荷遵循传统电荷转移机制,而远离TiO_(2)/Cu_(2)O接触边界区域的条带中光生电荷则通过底部的FTO导电基体实现Z型电荷转移,其有效作用距离长达约5μm,是该体系中的主要电荷转移机制.该TiO_(2)/Cu_(2)O图案化薄膜展现出全光谱下光催化全解水的能力,所产生的H_(2)/O_(2)化学计量比接近2:1.此研究为设计具有高效Z型电荷转移过程的异质结构光催化材料提供了重要的借鉴作用.

摘要：In the nuclear reactor design, a code for automatically generated multi-temperature continuous-energy neutron cross section data library, which is called AMTND for short, was designed and developed to meet the need of the reactor core design coupled with thermal-hydraulic design. The code can provide a point-wise crosssection at any temperature for a Monte Carlo neutron transport program, such as MCNP. In ensuring that the nuclear data produced by AMTND meets the testing of critical benchmark experiments, the time-consumed by the nuclear data generating of AMTND compared with NJOY's was carried out and the result shows the code's excellence. In order to test the accuracy of the code, the Doppler coefficient test benchmark was also carried out and the results verified the code preliminarily.

摘要：Quantum-dot cellular automata (QCA) based on cryptography is a new paradigm in the field of nanotechnology. The overall performance of QCA is high compared to traditional complementary metal-oxide semiconductor (CMOS) technology. To achieve data security during nanocommunication, a cryptography-based application is proposed. The devised circuit encrypts the input data and passes it to an output channel through a nanorouter cum data path selector, where the data is decrypted back to its original form. The results along with theoretical implication prove the accuracy of the circuit. Power dissipation and circuit complexity of the circuit have been analyzed.

摘要：Small long-life transportable high temperature gas-cooled reactors(HTRs) are interesting because they can safely provide electricity or heat in remote areas or to industrial users in developed or developing *** paper presents the neutronic design of the U-Battery,which is a 5 MWth block-type HTR with a fuel lifetime of 5–10 *** a reactor pressure vessel diameter of less than 3.7 m,some possible reactor core configurations of the 5 MWth U-Battery have been investigated using the TRITON module in SCALE *** neutronic analysis shows that Layout 12×2B,a scattering core containing 2 layers of 12 fuel blocks each with 20% enriched235U,reaches a fuel lifetime of 10 effective full power years(EFPYs).When the diameter of the reactor pressure vessel is reduced to 1.8 m,a fuel lifetime of 4 EFPYs will be achieved for the 5 MWth U-Battery with a 25-cm thick graphite side *** 6×3 and 6×4 with a 25-cm thick BeO side reflector achieve a fuel lifetime of 7 and 10 EFPYs,*** comparison of the different core configurations shows that,keeping the number of fuel blocks in the reactor core constant,the annular and scattering core configurations have longer fuel lifetimes and lower fuel cost than the cylindrical ***,for the 5 MWth U-Battery,reducing the fuel inventory in the reactor core by decreasing the diameter of fuel kernels and packing fraction of TRISO particles is more effective to lower the fuel cost than decreasing the 235U enrichment.