基于循环谱截面智能分析的混合信号调制识别方法

针对已有混合信号识别方法存在智能化程度低、适应性差等问题，提出了一种基于循环谱截面和深度学习相结合的智能识别方法。理论推导分析了常见混合通信信号的循环谱零谱频率截面特征；利用提出的非线性分段映射和指向性伪聚类新方法对上述截面图进行预处理特征增强，提高了截面特征的适应性和一致性；并将预处理后的特征图与经典残差网络相结合，利用深度学习网络对特征图中调制信息的深层次细节挖掘分析能力，实现了混合信号的有效识别。仿真结果表明，该方法对噪声不敏感，当信噪比不低于-2 dB时，平均识别率大于90%；且该方法对信号参数及信号间能量比变化有较好的适应能力。     

面向工程应用的液压教学

为了增强学生对液压知识的学习兴趣,提高液压课程的教学效果,在介绍国内外人才培养模式的基础上,在液压的教学、实验等环节积极进行探索面向工程应用的培养模式,取得较好的教学效果。     

Congratulations to Academician Changxu Shi on the Occasion of His Winning the 2010 Chinese Science ＆ Technology Grand Prize

On behalf of friends and colleagues at MIT and Johns Hopkins University,as well as students and faculty at the Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano) at Xi’an Jiaotong University,we would like to express our hearty congratulations to Academician Shi on the occasion of his winning the highest science and technology award of China.This very well deserved "Life Achievement Award" recognizes the brilliant scientific career of Dr.Shi.The entire disciplines of materials science and nanosciences in China should also feel much gratified by this prize,for it was Dr.Shi who had vigorously     

基于VC6.0的SR830数据采集系统的设计与实现

基于VC6.0实现了对SR830锁相放大器串口数据的精确采集与监测.首先,分析了光电检测系统中常用的SR830锁相放大器的串口数据传输特点,并分析了VB等环境下使用通信控件开发采集软件的不足.其次,通过需求分析,从框架建立、图形显示、通信设计等方面,对系统结构进行了构建.最后,基于VC6.0和重叠I/O,实现了数据采集系统.结果显示,该系统实现了对SR830数据的实时精确采集、显示和事后保存、历史文件比较等功能,克服了之前软件易发生溢出错误的问题,满足了光电化学检测的需要.     

南方S750在土地监测中的应用

全球定位系统（GPS）在土地监洲领域中既是遥赢技术的辅助定位手段，也可以作为独立的数据获取手段。南方s750手持数据采集系统的核心技术采用就是GPS定位技术。本文首先整体把握土地监洲的内容和方法以及应用领域，在这基础上来阐述如何利用高精度的南方s750对土地的违法使用进行实时苴控与管理，对土地进行整体的、实时的和动态的监潮分析，从而保障土地违法执法工作的实效高效，以及土地资源的合理管理。     

三个新大环草酰胺Ni(Ⅱ)配合物配体的合成、结构和DNA切割活性研究

合成了3个新的大环草酰胺Ni(Ⅱ)单核配合物NiL1(1),NiL2·CH3CH2OH(2)和NiL3·1.25H2O(3).由于羟基和草酰胺基团的氧原子都能够与金属离子配位,因此,NiL1-3可以用作构筑同多核和异多核配位化合物的配合物配体.X-射线单晶结构分析表明,每个大环配体的4个N原子与Ni(Ⅱ)配位,构成变形的平面正方形配位环境;Ni-N键的长度都非常短,表明3个大环配体中所有氮原子的配位能力都很强.1~3中的醇羟基使羟自由基淬灭,从而抑制了配合物切割DNA的活性.     

《环境监测》课程体系改革探讨

根据《环境监测》与《分析化学》课程的特点,合并两门课程,重组形成《环境监测与分析》。并从理论教学和实践教学两个方面,提出提高教学效果、培养适应社会需求的＂后劲足,上手快＂的合格人才的具体措施。     

Construction of a bacterial artificial chromosome library for Gossypium herbaceum var. africanum

Gossypium herbaceum var. africanum is the only wild cotton species within the cultivated diploid G. herbaceum. As the A sub-genome donor of tetraploid cotton, it is characterized by its resistance to insects, diseases, and other adversities. We have constructed the first bacterial artificial chromosome library (BAC) for G. herbaceum var. africanum. With high quality and broad coverage, this library includes 75000 clones, with an average insert size of about 115 kb and fewer than 4% empty clones. Our library is approximately five-fold the size of the A-genome (1667 Mb) and it provides 99.3% probability for isolating genes of interest or their sequences. Using nine SSR markers that are located on five different chromosomes and linked with resistance to Verticillium wilt, seven of nine could amplify the 40 superpools and got 1-14 hits. Because of its moderate wide coverage and relative large insert size, this library will be an important genomic resource for classifying and analyzing the evolution of cotton species, as well as for isolating disease-resistance genes and control elements.     

Suitability assessment of deep groundwater for drinking, irrigation and industrial purposes in Jiaozuo City, Henan Province, north China

Groundwater has been a major natural resource for human consumption in north China. It is necessary to appreciate the suitability of deep groundwater for drinking, agricultural irrigation, and industrial uses in this region. To this end, a total of 47 groundwater samples were collected from the study area; by comparing the concentrations of different hydrochemical variables with quality standard values, the variable fuzzy set (VFS) was applied to calculate the groundwater quality index (GQI) for various purposes, respectively. Afterward GQI spatial distribution maps were constructed using a geographic information system (GIS) tool to delineate spatial variations of groundwater quality. In this case study, the GQI spatial distribution maps reveal that the areas covered by "Maximum Permissible" groundwater for varying purposes (drinking, irrigation, and industrial) is 1377.2; 2354.7; and 3854.8 km2, respectively. The groundwater in the eastern part of the study area is suitable for drinking, with the southwestern region as the irrigation water source; the entire study area is acceptable for use in industrial, except the western part of Jiaozuo City. Therefore, the GQI spatial distribution maps can provide useful information for non-technical decision makers for better sustainable groundwater resources management.     

二甲基亚砜和胎牛血清对293T细胞冷冻效果的影响

使用含不同体积分数二甲基亚砜(DMSO)(5%、10%、15%、20%)和不同体积分数胎牛血清(FBS)(5%、10%、20%、40%)的细胞冷冻液以三步冷冻法冻存293T细胞.台盼蓝染色法进行活细胞计数后计算出解冻后细胞存活率.结果表明:FBS对293T细胞冷冻效果的影响是显著的(P<0.05),但添加20%和40%FBS的效果无显著差异(P>0.05);DMSO对293T细胞冷冻效果的影响则是极显著的(P<0.01),添加10%DMSO时,细胞的冷冻效果最好;冷冻液中含10%DMSO、40%FBS时的冷冻效果最佳,细胞存活率可达到82.00%.而实际应用中,含10%FBS、10%DMSO或20%FBS、5%～10%DMSO的细胞冷冻液也可达到较理想的冷冻效果,足以达到一般实验的要求.