继电强减装置相继动作的原因和处理

根据木瓜山水电站的实际，较全面地分析了水电站开机过程中的继电强减装置相继动作的原因，是典型回路设计不尽合理、机组空载位置发生改变和运行操作方法不当所致；提出了应完善典型励磁调整回路，适时校验继电器返回系数和机组的空载特性。     

Toxicity of halogenated oxyquinolines in dogs. A clinical study. II. History, symptoms, laboratory findings, therapy, and follow-up

Intoxication due to short-term oxyquinoline therapy was studied in 100 dogs, which had been so treated because of diarrhoea (except in 2 cases). The latter condition was in itself mild and uncomplicated. The main symptoms of intoxication were listlessness or excitation and nervousness, aggressiveness, tremor, convulsions, and salivation. Clinical examination revealed myocarditis and liver injury. Mortality, i.e. the sum of spontaneous deaths and euthanasia, amounted to 30 %. The treatment considered to be most important was sedation and anticonvulsant measures. It was further essential to correct the dehydration, which was often present. A follow-up investigation showed that approx. 1/3 of the dogs which had recovered from the acute intoxication developed recurrent convulsions within the next 3 years.     

水电站复式整流型操作电源存在的问题和改进意见

电力系统突然解列，操作电源随即消失，给机组控制、事故照明、机组起励等带来的影响，是水电站复式整流型操作电源设计中尚未解决的技术难题。根据木瓜山水电站的实际，提出了利用永磁机弥补上述缺陷的改进设计方案，具有设计简洁、投资省、等特点，并提出了水电站机组的运行可靠性。     

荧光二阶校正法用于氟喹诺酮类药物定量分析

采用交替三线性分解(ATLD)二阶校正法与三维荧光光谱相结合,对在依诺沙星(ENO)共存下的氧氟沙星(OFL)和诺氟沙星(NOR)进行同时定量测定.当组分数选为3时,获得的回收率分别为(100.2±0.5)%和(98.2±0.4)%;组分数选为4时,回收率分别为(100.3±0.4)%和(98.4±0.5)%.对实际药物中OFL和NOR的含量进行测定,所测结果与标示含量接近.实验结果表明,此法可用于未知干扰共存下氟喹诺酮类药物的同时直接快速定量测定.     

奶牛血清激发荧光强度的试验研究

根据荧光分析技术,对奶牛血清的荧光特性进行了研究,研究了正常和异常奶牛血清经不同的光激发后所产生的荧光及其变化情况。初步结果表明,异常奶牛血清的荧光强度比正常奶牛血清的荧光强度要弱。提出通过对奶牛血清的荧光强度进行分析,将其应用于奶牛疾病诊断这一国内外较少涉足的研究课题。     

白洋淀沉积物中溶解有机质荧光特性及其与铜的相互作用

在实验条件下通过三维荧光光谱、荧光猝灭滴定和质子核磁共振（1HNMR）,分析了白洋淀污染水体沉积物中溶解有机质（DOM）与Cu（Ⅱ）的相互作用。结果表明：DOM的结构以碳水化合物及多糖为主且具有明显的类蛋白（峰B）和类富里酸（峰A和峰C）荧光峰,类蛋白的荧光强度较强于可见类富里酸;3类荧光基团荧光强度由于Cu（Ⅱ）猝灭,呈明显不同程度的降低;并且DOM与Cu（Ⅱ）络合常数及1HNMR分析表明DOM中荧光基因与Cu（Ⅱ）络合或螯合能力较大,配位的配位基较多。     

聚丁二炔的结构相变

利用一个简单的连续模型去研究聚丁二炔的结构相变,对于其中的σ电子和π电子分别处理.在聚丁二炔链上,当出现从PDB相向PDA相转变时,会出现一个畴壁和反畴壁,这个相变的出现主要是由于π电子重新分布的结果.我们把畴壁(反畴壁)当作元激发来处理,详细分析了相变过程,计算了畴壁(反畴壁)的结合能,成功能解释了如下的实验事实:在低温下PDA相比PDB相更稳定,并且会自发地发生从PDB向PDA的相变.     

Supraventricular tachycardia in dogs: 65 cases (1990–2007)

Objective – To characterize the signalment, clinical findings, and prognosis of dogs with supraventricular tachycardia (SVT). Design – Retrospective study. Setting – North Carolina State University Veterinary Teaching Hospital. Animals, Intervention, and Measurements – Case selection included all patients at the veterinary teaching hospital with SVT during years 1990–2007. Medical records from dogs with at least 1 recorded episode of SVT were extracted. The signalment, history, electrocardiographic, radiographic, and echocardiographic findings, therapy, and response to therapy were reviewed and summarized. Follow‐up was conducted to determine the date and cause of death. Kaplan‐Meier survival curves were constructed and analyzed. The relationships between patient characteristics and responses to therapy and prognosis were evaluated. Main Results – Sixty‐five records documented a diagnosis of SVT. Sixty‐two percent were males. Labrador Retrievers and Boxers were overrepresented compared with the general hospital population. Median age at presentation was 9 years (range 0.5–15.5 y). The median heart rate during SVT was 270/minute (range 187–375/min). The most common presenting complaint was syncope (30%), 23% were asymptomatic at the time of diagnosis. Most dogs had structural heart disease (65%). Median survival was 472 days (<1–2007 d). Identification of sustained SVT (>30 s) did not affect survival (P=0.50), nor did the presence of congestive heart failure (P=0.70). Conclusions – The majority of dogs with SVT had structural heart disease or a severe concurrent illness at the time of SVT diagnosis. SVT, though often a persistent and occasionally sustained arrhythmia, does not appear to be a primary factor in mortality.     

飞轮电池不对称励磁卸载轴向悬浮混合磁轴承设计

针对飞轮电池支承与传动系统集成度低、能量损耗大等问题,该文设计了一种兼顾卸载和轴向悬浮的不对称励磁混合磁轴承,该磁轴承拓扑结构由含永磁环的上定子、下定子及转子组成。分析了不同工作模式下的运行机理;综合考虑永磁退磁、最大偏心以及轴向扰动等因素对磁轴承卸载能力的影响,制定了磁轴承额定卸载力约束准则;结合永磁材料工作曲线,推导出卸载力数值模型以及退磁/最大偏心下轴向补偿力数值模型并实现了磁轴承关键结构参数设计。三维有限元分析表明,正常卸载力、退磁卸载力、偏心卸载力的有限元分析值与理论值误差分别为4%、3.7%和5.8%,验证了参数设计结果的准确性。样机试验结果表明,卸载力理论计算值与实测值的最大误差约为4%,平均误差为2%;轴向负载80N时,转子由上定子气隙处保护磁轴承起浮,稳定悬浮后轴向单边位移约为25μm,轴向负载120N时,转子由下定子气隙处保护磁轴承起浮,稳定悬浮后轴向单边位移约为35μm,所设计的磁轴承具有良好的卸载与悬浮性能。研究结果可为高集成、低损耗、高可靠性的飞轮电池系统设计提拱参考。     

基于MATLAB和ANSYS联合仿真的罐车寿命预测

采用名义应力法来预测罐车的疲劳寿命。通过MATLAB模拟得到符合实际运行工况的A级路面的随机激励,将罐车的钢板弹簧和轮胎的刚度进行等效处理,并利用模态综合法,得出最大应力点的应力-时间曲线。根据材料的p-S-N曲线和米勒线性疲劳累积损伤理论,得出失效应力循环次数,并预测出整个罐车的疲劳寿命。