Effect of shaking table errors on specimen response and its correction measures

为了改善振动台控制精度问题,获取准确的结构响应,首先就振动台特性对结构响应的影响进行了分析,而后基于振动台输入输出响应,提出了实测结构响应修正方法.试验结果证明：修正方法较好地补偿了振动台误差的影响,修正后的试件响应能代表试件在期望地震动作用下的试件真实响应,因此,该修正方法能提高结构响应精度.Shaking table test is the main testing method for engineering structures research, which plays an important role in the research for seismic performance of structures. In order to improve control accuracy problems of shaking tables, and to get the authentic structural response, firstly, the influence of the shaking table dynamic on structural response was analyzed. And then a correction measure was developed based on the input and output of the shaking table. Correction method of better compensation of the influence of vibration table error was provided. And specimen corrected response can be better representative specimen's response at the desired ground motions. Finally, the performance of the developed method was verified experimentally. ? 2017, Editorial Department of Journal of Beijing University of Technology. All right reserved.教育部留学归国资助项目（Q0004014201501

模数转换(A/D)集成电路设计原理及其应用技术

随着数字信号处理技术的不断发展和人们对电子产品质量要求的不断提高,模数转换(A/D)集成电路芯片已成为电子产品设计中最关键的芯片器件之一,它的性能优劣直接决定着电子产品的质量.介绍了几种主要的A/D集成电路的基本原理,分析了各类A/D芯片的性能特点及其应用范围,指出了提高不同应用领域A/D芯片质量的关键技术及其发展趋势

香豆素-半花菁-苯硼酸对唾液酸的识别与光学传感

以共轭连接的香豆素和半花菁为信号报告基团,以苯硼酸为识别基团,设计合成了一种对唾液酸具有选择性识别的比色型荧光传感分子,命名为CHB,并采用吸收和荧光光谱方法研究其对唾液酸(N-乙酰神经氨酸)及其他糖类分子(如葡萄糖、蔗糖和麦芽三糖等)的响应.结果表明,CHB仅对N-乙酰神经氨酸表现出显著的吸收和荧光光谱响应,并通过高分辨质谱研究证实二者以1∶1计量比通过共价作用结合形成复合物.N-乙酰神经氨酸与苯硼酸的共价作用和静电作用共同影响了香豆素-半花菁共轭体系的分子内电荷转移,从而引起显著的溶液颜色变化和高选择性的光谱响应,因此CHB可用于N-乙酰神经氨酸的可视化检测.国家自然科学基金(21435003,91427304,21521004,J1310024

基于偏好统计数据表征的鲁棒几何模型拟合方法

鲁棒几何模型拟合是计算机视觉的一个基础性研究问题,广泛应用于各类计算机视觉任务,如单应性矩阵或基础矩阵估计、图像匹配、医学图像分析等。它的主要任务是:在包含噪声点和离群点的数据集中估计模型实例的参数和个数。针对该任务,本文提出一种基于新型数据表征(称之为偏好统计数据表征)的模型拟合方法。该新型数据表征算法将残差值进行排序然后映射到不同的区间以构建残差直方图数据表征,来描述数据分布的特征。该算法充分利用传统模型拟合方法中偏好分析和一致性统计分析的优点,更加有效地对数据分布特征进行描述,从而有效地提高数据表征的准确性和鲁棒性。为了进一步有效地利用该数据表征中的统计信息(内点和离群点显示出显著的信息熵值差异),本文利用直方图中不同区间段所映射的残差值的出现频次,以分析直方图的特性。并且采用一种简单的自适应熵阈值算法,来区分内点与离群点以进行离群点检测。最后,为了能够更好地处理分布在交叉模型实例附近的数据点,本文引入一种基于相似矩阵学习的图聚类技术,提出一个有效的模型实例估计算法。该算法先是用聚类技术以实现数据的分割,进而估计模型实例的参数。同时,该模型实例估计算法结合拉普拉斯矩阵特征值的分析..

SBA-15 supported vanadium oxide catalyst for selective oxidation of methane

The VOx/SBA-15 has been found to be a better catalyst for the selective oxidation of methane to formaldehyde than SBA-15-supported Mo and W oxides. The influences of catalyst support and vanadium source on catalytic performances have been studied. The results show that SBA-15 is a better support than MCM-41 and Cab-O-Sil, and the catalyst with NH4VO3 as the precursor exhibits higher performances. The addition of phosphorus has been found to enhance slightly the selectivity to HCHO. Characterizations by XRD, N-2 physical adsorption, Raman spectroscopy and H-2-TPR suggest that the supported VOx species with loading amounts lower than 3 wt% be highly dispersed (probably as monomer) and contribute to the selective oxidation of methane to formaldehyde

郁达夫早期文艺美学思想论稿

学位：文学硕士院系专业：人文学院中文系_中国现当代文学学号：199000

Caloric values of plant propagules at Niumulin Nature Reserve Zone of Fujian Province

对福建省牛姆林自然保护区18种植物繁殖体(花或果)的热值和灰分含量初步研究结果表明,18种植物繁殖体的灰分含量为21.8～77.4g/kg,平均为46.7g/kg;植物繁殖体具有较高的干物质量热值和去灰分热值(除壳斗科青冈果的干物质量热值和去灰分热值较低外),其余植物繁殖体的干物质量热值为20153.8±50.9～28533.3±37.2J/g,去灰分热值为20900.7～29552.9J/g,植物繁殖体具有较高的热值含量是其功能的具体表现。 【英文摘要】 The ash contents,gross caloric values and ash-free caloric values in the propagules of 18 plants at Niumulin Nature Reserve Zone of Fujian Province are discussed in this paper.The results show that ash contents in these plant propagules vary from 21.8-77.4g/kg,the average is 46.7g/kg; the plant propagules have the high caloric values,in which gross caloric values and ash-free caloric values vary from 20153.8±50.9J/g to 28533.3±37.2 J/g and from 20900.7J/g to 29552.9 J/g,respectively.Except that gross calori...福建省牛姆林自然保护区项目资

SBA-15 Supported Vanadium Oxide Catalyst for Selective Oxidation of Methane

对SBA 15负载的钒、钼、钨氧化物催化的甲烷选择氧化反应性能进行了比较 ,发现VOx/SBA 15催化剂优于MoOx/SBA 15和WOx/SBA 15催化剂 .针对钒氧化物催化剂 ,考察了不同钒源、不同载体以及少量P元素的添加对催化性能的影响 ,结果表明以SBA 15为载体的催化剂的性能好于MCM 41和Cab O Sil为载体的催化剂 ;与V2 O5,VO(C2 O4)相比 ,NH4VO3是制备性能良好的VOx/SBA 15的钒源 ;在VOx/SBA 15中 ,添加少量P元素后 ,HCHO的选择性有一定程度的提高 .XRD ,N2 物理吸附、UV Raman和H2 TPR表征结果表明 ,负载量低于 3wt%时 ,钒组分可能主要以高分散的单核的VOx 物种存在 ,我们推测该物种对甲烷选择氧化制甲醛起关键作用 .The VO x/SBA-15 has been found to be a better catalyst for the selective oxidation of methane to formaldehyde than SBA-15-supported Mo and W oxides. The influences of catalyst support and vanadium source on catalytic performances have been studied. The results show that SBA-15 is a better support than MCM-41 and Cab-O-Sil, and the catalyst with NH 4VO 3 as the precursor exhibits higher performances. The addition of phosphorus has been found to enhance slightly the selectivity to HCHO. Characterizations by XRD, N 2 physical adsorption, Raman spectroscopy and H 2-TPR suggest that the supported VO x species with loading amounts lower than 3 wt% be highly dispersed (probably as monomer) and contribute to the selective oxidation of methane to formaldehyde.国家自然科学基金 (Nos.2 0 0 2 1 0 0 2 ,2 0 2 730 54);; 国家重点基础研究发展规划项目 (No .G1 9990 2 2 4 0 8);; 教育部留学回国启动基金资助项