《小镇畸人》中的词汇衔接分析

词汇衔接是英语语篇中重要的衔接手段之一.以Halliday等语言学家的衔接理论为基础,分析了舍伍德·安德森的<小镇畸人>中词汇衔接的分类和作用,探讨了各种词汇衔接机制在语篇连贯构建中的独特意义.     

边坡锚固工程分析中的水平条分法

对目前中国规范推荐用于边坡加固计算的垂直条分传递系数法进行研究,发现将该方法用于边坡锚固受力分析时,不仅存在垂直条块与加固结构体（锚杆和锚索）相互交叉,而且计算得出的锚固力与加固体的实际锚固力存在偏差等缺陷。在相关资料提出的、用于加筋土稳定性分析的水平条分法基础上,结合边坡锚固工程的特点,将该水平条分法做进一步拓展,使其能适用于锚杆和锚索等边坡锚固工程的稳定性计算,并通过工程实例对拓展后的水平条分法进行了验证。     

美国《1990年建筑作品版权保护法》评述

在1990年12月以前,建筑作品是作为绘画、图形和雕塑作品获得版权保护的.但是建筑本身被认为是一种实用物品,因而不受版权的保护.然而在1989年3月1日,美国加入《伯尔尼公约》.为了履行公约义务,美国国会通过了《1990年建筑作品版权保护法》(简称AWCPA),对《1976年版权法》进行了相应的修正,建筑作品作为独立的一类作品受版权法的保护,拓宽了建筑作品的保护范围,对建筑作品侵权的认定标准也发生变化.     

Crystallization and conductivity mechanism of ITO films on different substrates deposited with different substrate temperatures

ITO thin films were grown on PC(polycarbonate), PMMA(polymethyl methacrylate) and glass substrates by r.f. magnetron sputtering. The electrical, structural and chemical characteristics of ITO films were analyzed by the Hall Technique, X-ray diffraction, and X-ray photoelectron spectroscopy. XPS studies suggest that all the ITO films consist of crystalline and amorphous phases. The degree of crystallinity increases from less than 45% to more than 90% when the substrate temperature increases from 80 to 300 ℃. The In and Sn exist in the chemical state of In3+ and Sn4+, respectively, independent of substrate type and temperature. The enrichment of Sn on surface and In in body of ITO films are also revealed. And, the oxygen deficient regions exist both in surface layer and film body. For ITO films deposited under 180 ℃ , the carrier concentration are mainly provided by oxygen vacancies, and the dominant electron carrier scattering mechanism is grain boundary scattering between the crystal and the amorphous grain. For ITO films deposited over 180 ℃, the carrier concentration are provided by tin doping, and the dominant scattering mechanism transforms from grain boundary scattering between the crystal grains to ionized impurity scattering with increasing deposition temperature.     

氟硅酸溶液中氟硅酸及氢氟酸含量的测定

基于生成氟硅酸钾沉淀和该沉淀水解均析出不同量酸，用碱滴定完成氟硅酸及氢氟酸的连续测定。该方法用于生产实践，结果令人满意。     

A Spatial Cognitive Model that Integrates the Effects of Endogenous and Exogenous Information on the Hippocampus and Striatum

Machine Intelligence Research - Reproducing the spatial cognition of animals using computational models that make agents navigate autonomously has attracted much attention. Many biologically...     

A Hybrid Model Based on Variational Mode Decomposition and Gradient Boosting Regression Tree for Monthly Runoff Forecasting

Water Resources Management - Accurate and reliable monthly runoff forecasting is of great significance for water resource optimization and management. A neoteric hybrid model based on variational...     

Influence of deposition pressure on properties of ZnO: Al films fabricated by RF magnetron sputtering

Transparent conductive aluminum doped zinc oxide(ZnO:Al,AZO) films were prepared on glass substrates by rf(radio frequency) magnetron sputtering from ZnO: 3wt% Al_2O_3 ceramic target. The effect of argon gas pressure(PAr) was investigated with small variations to understand the influence on the electrical, optical and structural properties of the films. Structural examinations using X-ray diffraction(XRD) and scanning electron microscopy(SEM) showed that the ZnO:Al thin films were(002) oriented. The resistivity values were measured by four-point probe with the lowest resistivity of 5.76×10~(-4) Ω?cm(sheet resistance=9.6 Ω/sq. for a thickness=600 nm) obtained at the PAr of 0.3 Pa. The transmittance was achieved from ultravioletvisible(UV-VIS) spectrophotometer, 84% higher than that in the visible region for all AZO thin films. The properties of deposited thin films showed a significant dependence on the PAr.     

洋流干扰下的多自主水面无人船最优覆盖控制

针对洋流干扰下的多自主水面无人船(ASV)对有限海洋环境进行覆盖监控的最优化问题,提出一种基于环境信息密度的分布式控制方法。该控制方法是在考虑洋流因素的情况下,以二阶EulerLagrange模型为控制模型的最优覆盖策略。首先建立基于欠驱动系统的最优覆盖模型,提出时变洋流干扰下的多ASV最优区域分配算法。在此基础上,针对ASV的欠驱动特性,综合应用运动学控制方法与Backstepping技术设计基于二阶Euler-lagrange方程的最优覆盖控制算法,并利用Lyapunov稳定性理论证明其稳定性。最后对多ASV最优覆盖网络进行仿真验证实验,实验结果表明该控制方法能够使多ASV在洋流干扰下从区域Q的任意初始位置收敛到最优覆盖配置。     

Kinetics simulation of propylene epoxidation over different Ti species in TS-1

A thorough experimental investigation on the kinetic behavior of liquid-phase propylene epoxidation over TS-1 and tetrapropylammonium hydroxide (TPAOH) treated TS-1 catalysts was conducted in a fixed-bed reactor. The amounts of different coordinated Ti species in the catalysts were quantified by spectroscopies, and their catalytic performances of the epoxidation and alcoholysis of propylene oxide were measured by kinetic modeling. The study shows that the TPAOH treatment converted some of the tetrahedrally coordinated Ti to octahedrally coordinated Ti, and both species were active for the epoxidation and alcoholysis. The superior catalytic performance observed over the TPAOH treated TS-1 is due to two factors, the increased percentage of active sites, and reduced energy barrier for epoxidation on the octahedrally coordinated Ti. In addition, as the H₂O₂ conversion increases, the adsorption equilibrium constant of propylene oxide plays a more decisive role than the activation energy for the selectivity of propylene glycol monomethyl ethers.