基于ADAMS的六自由度运动平台运动学分析

针对一种六自由度运动平台,建立其运动学模型,应用ADAMS分析软件进行了运动学仿真,证明了ADAMS分析软件对并联机构运动学正面和反面问题求解的有效性.     

旅游景区主题的物态化表现方式——重庆市涪陵区水磨滩水库设计构想

景区的主题设计和表现是景区规划的重要内容。各种不同的景区主题不同。对于观念、情绪或情感类主题的表现,需要用物态化方式,即用物质来体现主题氛围。以重庆市涪陵区水磨滩水库景区设计为例,对景区主题物态化的方法及营造景区的主题“场”等方面进行了研究,从而构建主题的物态“体系”。     

FDTD Analysis and Application of Sleeve Monopole Antenna

Based on the symmetry of the structure, a two-dimensional finite difference time domain （FDTD） method is used to analyze the sleeve monopole antenna on the infinite perfect conductor ground fed by a coaxial line. The fields in time domain are then turned into frequency domain through the discrete Fourier Transform to compute the surface current distribution and the input impedance of the sleeve monopole antenna. The gain or pattern of the monopole antenna is also computed, employing the combination of the image theory and the near-to-far transformation in frequency domain. All the computed results agree very well with the results of other methods and measured ones, verifying the application of the FDTD method to analyze the sleeve monopole antennas. The voltage standing wave ratio （VSWR） of the sleeve monopole antennas with different heights and radii of the sleeve are checked to study the influence of the sleeve, which indicates that the height and the radius of the sleeve are both important to the impedance bandwidth of the sleeve monopole antennas.     

Partial oxidation of methane to syngas in tubular oxygen-permeable reactor

A dense Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ membrane tube was prepared by the extruding method. Furthermore, a membrane reactor with this tubular membrane was successfully applied to partial oxidation of methane (POM) reaction, in which the separation of oxygen from air and the partial oxidation of methane are integrated in one process. At 875℃, 94% of methane conversion, 98% of CO selectivity, 95% of H₂ selectivity, and as high as 8.8 mL/(min · cm²) of oxygen flux were obtained. In POM reaction condition, the membrane tube shows a very good stability.     

基于LINK 的结构系统建模方法研究

针对有限元和试验模态分析的局发性，探讨了一种有限元分析与动态试验相结合的模型修正方法，即基于LINK的结构系统建模方法。将计算与试验结果进行数据融合，以给定模态置信度准则为基础，进行模型的迭代修正分析，进而构造精确的结构系统动力模型，最后基于LINK方法，对梁结构进行了计算与试验相结合的建模分析，取得了良好的效果。     

单克隆抗体亲和层析纯化基因工程人γ-干扰素研究

用抗基因工程人γ－干扰素单克隆抗体（２Ａ１２）细胞株亲和层析从表达人γ－干扰素的大肠杆菌抽提液中纯化经稀释复性后的γ－干扰素。一步纯化后的γ－干扰素含量达９５％以上，蛋白质的比活性达 １．２×１０ｕ／ｇ，收率为７８％。洗脱液用 ０．５ｍｏｌ／ＬＮａＣＩ的 ＰＢＳ溶液，洗脱率达９２．８％。     

谷氨酸离子交换过程动态穿透曲线的分析

介绍了一种新的分析离子交换过程穿透曲线的方法，该方法采用特定的函数来描述穿透曲线以求出在不同实验条件下的离子交换过程的传质参数。该特定函数建立在吸附区传质概率的基础上，因此传质机制可以用函数的常数来表示，无需识别传质机理。采用该方法建立了ＮＨ４＋型阳离子交换树脂吸附谷氨酸的穿透曲线模型，以得到离子交换过程的传质参数。     

The possible subduction of continental material to depths greater than 200 km

Determining the depth to which continental lithosphere can be subducted into the mantle at convergent plate boundaries is of importance for understanding the long-term growth of supercontinents as well as the dynamic processes that shape such margins. Recent discoveries of coesite and diamond in regional ultrahigh-pressure (UHP) metamorphic rocks has demonstrated that continental material can be subducted to depths of at least 120 km (ref. 1), and subduction to depths of 150-300 km has been inferred from garnet peridotites in orogenic UHP belts based on several indirect observations. But continental subduction to such depths is difficult to trace directly in natural UHP metamorphic crustal rocks by conventional mineralogical and petrological methods because of extensive late-stage recrystallization and the lack of a suitable pressure indicator. It has been predicted from experimental work, however, that solid-state dissolution of pyroxene should occur in garnet at depths greater than 150 km (refs 6-8). Here we report the observation of high concentrations of clinopyroxene, rutile and apatite exsolutions in garnet within eclogites from Yangkou in the Sulu UHP metamorphic belt, China. We interpret these data as resulting from the high-pressure formation of pyroxene solid solutions in subducted continental material. Appropriate conditions for the Na2O concentrations and octahedral silicon observed in these samples are met at depths greater than 200 km.     

当前工程实践教学改革的误区及对策

当前工程实践教学存在着人才培养目标定位不明确、重内容改革轻师资建设、重经费投入轻资源共享等若干误区,而产生误区的根源在于缺乏对实践教学及其改革的系统认识.因此,结合系统特性,采取科学定位人才培养目标、大力加强实践教学师资队伍建设以及不断推进实践教学资源共享等有效措施,确保取得成效.     

Elemental composition of aerosols collected in the glacier area on Nyainqêntanglha Range, Tibetan Plateau, during summer monsoon season

In order to investigate the elemental composition in atmospheric aerosols and its sources in the glacier area over the Tibetan Plateau (TP), seven totally suspended particle samples were collected continuously at the col of the Zhadang glacier (30°28′N,90°39′E,5800 m a.s.l.), Nyainqêntanglha Range, southern TP, from June to October 2006. Twenty-seven elements (Li, Be, B, Na, Mg, Al, K, Ca, Sc, Ti, V, Fe, Mn, Zn, Ga, As, Rb, Sr, Y, Cd, Cs, Ba, Tl, Pb, Bi, Th, U) were analyzed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The result indicates that the concentrations of most elements (especially crustal elements) are lower than values at the Nam Co Station during the same period of 2005, and also much lower than other sites in the TP such as Wudaoliang and Waliguan. This suggests that elemental compositions of aerosols in the Zhadang glacier area may represent the background levels of the middle/upper troposphere over the TP. Crustal enrichment factors (EFs) reveal that several elements (e.g. B, Zn, As, Cd, Pb and Bi) may have anthropogenic sources. The southern TP is mainly influenced by the summer Indian monsoon during the sampling period. Backward air mass trajectory analysis suggests that air masses in the region may originate from South Asia. Therefore, anthropogenic pollutants from South Asia may be transported by the summer Indian monsoon to the region which clearly affects the atmospheric environment in the southern TP during the summer monsoon season.