C/C++源代码静态检测系统的设计和实现

为了检测出C/C++源代码程序中常见的运行时错误,设计了一个静态检测系统。该系统通过词法分析、语法分析、语义分析来获取程序的语法树。然后系统的检测程序将会分析语法树的每一个结点,判断结点中的属性信息是否存在错误。创新点在于语法树数据结构和检测程序的设计。通过检测程序对结点的属性值的分析,能够检测出C/C++源代码程序中出现的数组越界、指针错误、字符串函数错误,内存泄露等问题。     

浅析ETS控制系统电源回路的设计

介绍了目前常用的ETS控制系统电源回路的设计方案,并对不同系统的优缺点进行了分析,提出了合理意见,使ETS系统更安全、可靠,以适应电厂安全稳定运行的需求。     

基于AST方法的核电厂LOCA释放源项计算分析

根据AST方法建立了AP1000LOCA放射性核素活度计算模型,研究事故后安全壳及环境中放射性核素活度的变化。结果表明:事故后安全壳气空间内各核素的放射性活度呈先增大后减小的趋势,40min时达到最大。根据核素性质,将其分为不考虑母核衰变的核素和考虑母核衰变的核素。事故发生40min后,前者在安全壳内的活度指数减小,典型核素有131~135I、83 Krm等,后者由于母核衰变的影响导致其在安全壳内的活度减小趋势放缓,典型核素有85 Kr、133 Xem、133 Xe和135 Xe等。I和Cs由于受自然去除机制的去除作用,事故几小时后其向环境的累积释放量增长非常缓慢;对于Kr和Xe,半衰期较长的核素向环境的累积释放量不断增大,半衰期较短的核素在事故几小时后向环境的累积释放量趋于平衡。     

Visualization,understanding, and mitigation of process-induced-membrane irregularities in gas diffusion electrode-based polymer electrolyte membrane fuel cells

Polymer electrolyte membrane fuel cells (PEMFC) show substantial promise for their application in electric vehicles. For large-scale manufacturing of PEMFCs, roll-to-roll coated gas-diffusion-electrodes (GDE) offer certain advantages over other production pathways. Procedures including hot pressing and coating an ionomer overlayer may be necessary for this manufacturing pathway to enable a suitable catalyst layer/membrane interface. The same procedures may potentially introduce membrane irregularities, especially when thin membranes are used. Limited understanding exists regarding if and to what extent such irregularities impact PEMFC performance and lifetime, and therefore be considered defects.In this study, NREL's customized fuel cell hardware that enables quasi in-situ infrared (IR) thermography studies was utilized to visualize spatial hydrogen crossover and identify membrane irregularities that originated from the GDE-based MEA fabrication process. The structure of these membrane irregularities was investigated by scanning electron microscopy (SEM) and its impact on initial H₂/air performance was determined. Accelerated stress testing (AST) revealed that these irregularities develop into failure point locations. These results were validated across many MEAs with identified process-induced membrane irregularities. By selecting specific gas diffusion media properties and by fine tuning the MEA hot pressing parameters, the formation of such membrane irregularities was mitigated.     

8种中药煎液防治小鼠酒精性肝损伤的作用比较

从已报道具有明确保肝作用的8味中药中筛选出对酒精性肝损伤保护作用较好的中药。采用56度红星二锅头(12m L/kg·bw)灌胃10 d建立酒精性肝损伤模型,测定小鼠醒酒、醉酒时间和血清谷草转氨酶(AST)、谷丙转氨酶(ALT),采用HE染色观察肝组织病理学变化。结果表明:川芎、五味子和甘草组的醉酒时间较给药前分别延迟了75.64%(p0.05)、73.87%(p0.05)和153.58%(p0.001);川芎、五味子、葛根、葛花、枳椇子、甘草和黄芩组的醒酒时间分别缩短了75.04%(p0.001)、67.95%(p0.001)、71.39%(p0.01)、60.84%(p0.001)、75.26%(p0.01)、80.48%(p0.001)、54.83%(p0.05)。与肝损伤模型组相比,川芎、白芍、葛根、葛花、甘草和黄芩组的ALT水平分别降低了22.78%(p0.001)、27.84%(p0.001)、14.31%(p0.01)、20.68%(p0.01)、12.14%(p0.05)、20.81%(p0.01);白芍和葛根组AST水平分别降低14.71%(p0.05)和12.69%(p0.05)。病理结果显示川芎、白芍、葛根、葛花、甘草和黄芩组肝细胞水肿和坏死显著减少,肝细胞病变程度减轻。本研究表明,在所研究的8种中药中,川芎、白芍和葛根对酒精性肝损伤的保护作用较好,另外发现川芎还有解酒防醉作用。     

基于色彩地址空间转换与多版本策略的复杂位图协同模型与一致性维护算法

调色编辑在现有位图协同模型下存在数据发送量大、编辑灵活性差、操作重叠易冲突、生成版本多、站点存储压力大等问题,针对这些问题提出了一种面向复杂位图的调色协同编辑模型。协同操作仅发送坐标与色彩变化量的协同操作,具有数据量小、多维编辑粒度、位置可重叠等特性;增加了时空关系的四维位图协同架构,只保存已编辑的像素点数据可减少数据存储量;采用空间转换的副本状态控制算法,通过回溯重构历史版本,可以确保协同操作总是在正确的副本状态上执行;根据当前状态与策略配置,动态生成分支版本的算法,可以解决此前模型分支版本过多的问题。最后,基于CCI（causality-preservation,convergence,intention-preservation）模型进行正确性推论,开发协同编辑器原型Co-Pixel,随机生成的操作集设计实验,对照Adobe Lightroom 模拟实际编辑行为。结果显示提出的模型可有效减少操作产生冲突,降低一致性维护过程中的算法开销,灵活调整用户执行意图维护工作的结果版本。     

火电机组汽轮机紧急跳闸系统的设置原则

本文对采用可编程逻辑控制器(PLC)或分散控制系统(DCS)的汽轮机危急遮断系统(ETS)设置原则及方法进行探讨,以进一步做到ETS设计的规范化.     

苹果多酚对四氯化碳致小鼠急性肝损伤的保护作用

目的:研究苹果多酚对四氯化碳造成的肝损伤的预防和保护作用.方法:采用四氯化碳制作ICR小鼠肝损伤模型,灌胃苹果多酚进行预防,检测血清肝功能主要指标白蛋白、胆碱酯酶、碱性磷酸酶、谷草转氨酶、谷丙转氨酶以及丙二醛和总抗氧化能力,探讨苹果多酚对小鼠急性肝损伤的保护作用.结果:灌胃苹果多酚,尤其是200mg/kg bw/d剂量水平,可以抑制或减缓肝损伤,保护肝脏功能.结论:苹果多酚对肝脏及其功能有保护作用.     

A review of botanical characteristics, phytochemistry, clinical relevance in efficacy and safety of Lycium barbarum fruit (Goji)

Lycium barbarum has been used as a traditional Chinese medicine (TCM) to nourish liver and kidney, and brighten the eye. The fruits are dried or freshly squeezed for their juice and concentrated for beverages. Among various constituents, a group of polysaccharides (LBP) with a Glycan-O-Ser glycopeptide structure has been most researched and considered to be important for the efficacy of L. barbarum. Studies indicate effects of L. barbarum on aging, neuroprotection, general well-being, fatigue/endurance, metabolism/energy expenditure, glucose control in diabetics, glaucoma, anti-oxidant properties, immunomodulation, anti-tumor activity and cytoprotection. In addition to TCM, L. barbarum can be sold as a dietary supplement or classified as a food based upon the long and safe traditional usage. This review is to provide background and updated information of chemical constituents and efficacies with safety including a new direction for research and current regulatory situation of L. barbarum.     

小波自适应软门限信号去噪方法研究

简要介绍了小波多分辨分析的理论基础,在分析信号及噪声随小波分析尺度变化而变化的规律之后,针对小波去噪的核心问题——阈值的设定提出了一种新的方法．即自适应软门限去噪的方法。这种方法具有明确而直观的物理意义,实现简单、方便,通过实验证明,自适应软门限去噪方法具有较好的去噪效果。