“数字校园”异构数据整合系统的设计与实现

随着计算机技术的不断发展,越来越多的企业开始对各类管理信息系统进行整合.数据层面的集成是信息整合整体架构的重要组成部分.本文总结了异构数据整合系统的关键点,并具体针对IBM DB2 II V.8.1的信息整合器进行了原理、技术实现等方面的分析.同时根据具体的开发实践介绍了该技术在数字校园异构数据整合系统建设中的应用.     

Neutronics analysis for MSR cell with different fuel salt channel geometries

The neutronic properties of molten salt reactors (MSRs) differ from those of traditional solid fuel reactors owing to their nuclear fuel particularity. Based on...     

油田采出水Zeta电位和中值粒径对絮凝效果条件研究

该研究依据动态电泳光散射理论进行Zeta电位测定,利用多个激光源的光束投射测定中值粒径,采用絮凝沉降测定胶体颗粒的絮凝体积及沉降速度.着重考察不同采出水添加剂、聚醚类破乳剂、杀菌剂1227、阻垢剂EDTMP、咪唑啉类缓蚀剂与聚合氯化铝(PAC)复配对颗粒聚集Zeta电位、中值粒径、絮凝体积、沉降速度与颗粒聚集之间的关系...     

The Xyloglucan Endotransglucosylase/Hydrolase Gene XTH22/TCH4 Regulates Plant Growth by Disrupting the Cell Wall Homeostasis in Arabidopsis under Boron Deficiency

TCH4 is a xyloglucan endotransglucosylase/hydrolase (XTH) family member. Extensive studies have shown that XTHs are very important in cell wall homeostasis for plant growth and development. Boron (B), as an essential micronutrient for plants, plays an essential role in the cross-linking of cell wall pectin. However, the effect of B on cell wall organization is unclear. This study aimed to explore the mechanism of plant adaption to B stress by investigating the role of TCH4 in cell wall homeostasis. We conducted both plate and hydroponic cultures of wild-type Col-0 and overexpression and gene knockout lines of XTH22/TCH4 to analyze the phenotype, components, and characteristics of the cell wall using immunofluorescence, atomic force microscopy (AFM), and transmission electron microscopy (TEM). B deficiency induces the expression of TCH4. The overexpression lines of TCH4 presented more sensitivity to B deficiency than the wild-type Col-0, while the knockout lines of TCH4 were more resistant to low B stress. Up-regulation of TCH4 influenced the ratio of chelator-soluble pectin to alkali-soluble pectin and decreased the degree of methylesterification of pectin under B-deficient conditions. Moreover, we found that B deficiency disturbed the arrangement of cellulose, enlarged the gap between cellulose microfibrils, and decreased the mechanical strength of the cell wall, leading to the formation of a thickened and deformed triangular region of the cell wall. These symptoms were more profound in the TCH4 overexpression lines. Consistently, compared with Col-0, the O₂⁻ and MDA contents in the TCH4 overexpression lines increased under B-deficient conditions. This study identified the B-deficiency-induced TCH4 gene, which regulates cell wall homeostasis to influence plant growth under B-deficient conditions.     

机械密封端面尺寸变化对密封效果的影响分析

机械密封的端面比压，不仅与结构形式、弹簧大小、液体介质黏度、温度、介质压力等因素有关，还直接与端面尺寸变化有关。在这里主要介绍密封端面尺寸变化对密封效果的影响，并得出有利于密封效果的尺寸变化。     

Topset-to-forest rollover trajectories as reliable predictors of sediment-volume partitioning into deep-lake areas

Topset-to-forest rollover trajectories and their relation to sediment-and sand-budget partitioning into deep-lake areas are far from being well understood,as co...     

ADS熔盐散裂靶中子学性能研究

与传统加速器驱动次临界系统（ADS）采用金属靶作为散裂中子靶的设计不同,加速器驱动次临界熔盐堆（AD-MSRs）采用靶堆一体的设计,直接使用燃料熔盐作为散裂中子靶。由于熔盐靶的中子学性能直接影响AD MSRs的能量放大系数、核废物的嬗变和核燃料增殖的效率,所以本研究基于MCNPX程序,详细计算了高能质子轰击氟盐和氯盐两种熔盐靶产生的散裂中子产额、散裂中子能谱、能量沉积分布以及散裂产物等中子学性能,并与液态Pb和铅铋共熔体（LBE）两种液态金属靶进行了对比。计算结果表明,熔盐靶在散裂中子产额上与液态金属靶有一定的差距,但熔盐靶内能量沉积分布的梯度较小,更有利于靶区的热量导出。与液态Pb和LBE靶相比,熔盐靶的散裂产物中包含更多的气体以及高质量数的α发射体核素。     

基于计算机视觉的电厂车辆智能监测系统设计与实现

针对电厂运煤车辆的管理,设计并实现了一个基于计算机视觉的电厂运煤车辆智能监测系统.提出了一种基于颜色分割和数字形态学处理相结合的车牌定位算法和一种基于Sobel灰度边缘算子的车牌倾斜校正算法.实际应用表明,该系统有很强的鲁棒性,可以处理污损、变形、各种光照条件下的车牌,并且速度快、准确率高     

基于DDS+ADC的综合演示平台的研制

介绍了一种基于DDS+ADC的综合演示平台.该平台包括用于信号产生的DDS板卡、用于信号采集的ADC板卡、用于缓存和传输的数据板卡以及用于通讯和控制的USB主控板等.综合演示平台配套软件采用Labview开发,拥有集通讯、计算、显示为一体的人机界面.DDS+ADC联合工作的性能为:SNR=70.8 dB,SFDR=84.9 dB.该平台具有精度高、完全脱离仪器、携带方便、界面友好、采用模块化设计、易于扩展等特点.