无粘结环锚预应力衬砌锚具槽布置方式对比研究

无粘结环锚预应力衬砌锚具槽是整个预应力衬砌受力的关键部位,其位置的选择对于整个预应力衬砌受力和安全而言至关重要。结合引松供水工程有压输水隧洞无粘结预应力衬砌结构,采用等效荷载法和实体建模相结合的方法进行Flac3D三维建模,对锚具槽单排和双排布置时的衬砌关键部位受力情况进行了分析。计算结果表明:(1)无粘结环锚预应力衬砌的下半环因锚具槽的影响,会存在局部预应力缺失和分布不均,而单排锚具槽布置能减小衬砌预应力的不均匀性。(2)锚具槽及附近区域是预应力衬砌的薄弱区,衬砌拉应力区主要分布在锚具槽环向的临空面附近,衬砌受压最大区域分布在相邻锚具槽之间。(3)双排锚具槽布置型式抗超载能力优于单排锚具槽布置型式。     

聚苯醚/环氧树脂体系的固化反应和热分解动力学研究

用动态差示扫描量热法和热重分析法研究了PPE/EP体系的固化反应和热分解反应,结果表明,其固化反应热和最大放热峰的峰温均随着PPE含量的增加而减小。PPE/EP体系的分解过程为一级反应;以Kissinger最大失重速率法求得表观活化能为184.54kJ/mol;以Ozawa等失重百分率法求得10%~30%的失重率下反应表观活化能在208.09~188.64kJ/mol之间,频率因子InA值在34.55~31.05min-1之间,表明PPE/EP体系的热稳定性很高,这为覆铜板的制作提供了重要动力学参数。     

某超长厂房预应力楼盖设计及检测

通过一个预应力梁板结构工程实例,简要介绍了4跨超长楼盖预应力方案的优化设计.文中对预应力主梁方案和次梁方案以及次梁方案中不同次梁间距布置进行了分析比较,同时还结合超长预应力束的不同处理方式进行了综合比较,最后抽取其中两根预应力梁进行了张拉过程和张拉锚固后的预应力损失、以及梁中所建立的预应力值和跨中的反拱值的检测,对理论分析结果进行了验证.     

论企业伦理的研究价值

企业伦理是当前伦理研究中的一个热点问题,企对业伦理进行研究不仅具有重要的理论价值和认识价值,而且具有重要的实践价值.     

NGC-CIMS信息分类编码系统的设计和实现

信息分类编码系统是CIMS各有关环节集成的纽带。本文针对NGC－CIMS对信息分类编码系统的需求，提出了一种面向CIMS各环节、分级、分段和柔性的信息分类编码系统的结构模型，在开发初期提出了基于OO的编码模型；在系统实现时，采用了码位依赖关系和基于元数据及码位模式分解的解决方法；在译码系统实现时，提出了基于总控元关系的译码方法；在基于编码的检索上，提出了不完全码的思想。目前该系统已成功得到了厂方应用。     

一种基于可扩展对象的程序设计方法

在对可视化程序设计实现机制研究的基础上，结合面向对象程序设计提出了一种可扩展对象程序设计方法。以窗体对象研究为出发点，叙述了采用复杂对象模块以及存储管理器实现子复杂对象生成的方法，对大型系统的开发具有一定的现实指导意义。     

化学二氧化锰中试研究

采用碳酸锰沉淀热解法进行300t/a化学二氧化锰（CMD）中试开发研究,就生产中的一些问题做了叙述,介绍了中试产品的各项技术指标。硫酸锰溶液除杂后主要金属杂质为0.1mg/L,中间产品碳酸锰的振实密度达到2.18g/cm3;产品的振实密度达到1.86g/cm3。     

Comparison of wound culture and bronchial lavage in the severely burned child: implications for antimicrobial therapy

BACKGROUND: The relationship of the burn wound flora to microbial pathogens in the tracheobronchial tree has important implications for antimicrobial therapy in the severely burned patient. Management of septic complications is bolstered by surveillance quantitative wound cultures (QWC) and bronchial lavage fluid (BLF) cultures. OBJECTIVES: To compare the organisms present in BLF with those found in QWC and to determine if QWC can predict BLF results. DESIGN: Results of BLF cultures from all patients who underwent bronchial lavage from January 1, 1996, to December 31, 1996, at our institution were compared with QWC data from the same date. Criteria for a positive match included an identical antibiotic susceptibility pattern and biotype. Match rates were calculated qualitatively and quantitatively. RESULTS: In 30 (48%) of the 62 BLF cultures, there was a match between the organism identified in the BLF and the QWC. When strict quantitative criteria were applied, the match rate was only 9 (14%) of 62. Burn size and inhalation injury had no significant effect on match rate. CONCLUSIONS: Whereas the microbial pathogens were similar in the QWC and BLF, linear regression showed no value of QWC in predicting BLF culture results. The difference between qualitative and quantitative match rates suggests cross-colonization between the burn wound and tracheobronchial tree, but little to no cross-infection. The QWC and BLF cultures must be performed independently in determining antimicrobial specificity in the burned patient.