读码器手柄注射模设计

分析了读码器外壳塑件的工艺性，详细介绍了读码器手柄的注射模具设计方案，重点阐述了如何解决模具结构设计中的侧向分型抽芯与开模方向的型芯的干涉问题，并总结了该模具的结构特点与使用效果。     

荧光法用于痕量亚硝酸根的测定

基于亚硝酸根与碘化钾反应生成单质碘，碘可使异硫氰酸荧光素发生荧光猝灭的原理，采用流动注射连续可更新液滴荧光法测定亚硝酸根．体系的激发和发射波长分别为492nm和516nm，亚硝酸根含量在25～100μg／L范围内有良好的线性关系，检测限为3．9μg／L．本方法灵敏度高，选择性好，操作简单．用于环境水样中痕量亚硝酸根的测定，结果满意．     

柘溪水电站主变压器故障分析

介绍了湖南柘溪水电站及其主变压器某次故障现象,分析了故障原因,介绍了事故处理的具体过程,提出了防范类似故障发生应采取的措施。     

抓取机械手的设计——应用于医用药水针剂瓶

本文设计了一种两自由度的并联机械手实现对医用药水针剂瓶的抓取动作,对这种机械手位置、速度、受力做了分析,最后进行了药水针剂瓶抓取机械手的结构设计。该机械手应该在医用药水针剂瓶以及其它瓶装货物的生产中有广阔的应用前景和实用价值     

基于基因算法优化薄壳注塑件之翘曲值

以模具温度、塑料温度、射出时间、保压压力、保压时间等五个制程参数作为控制因子,利用Moldflow仿真软件对薄壳后盖模型进行模流分析,以翘曲变形量为目标函数,应用Madab基因演算程序来搜寻最佳解制程参数组合．以期望达到塑件翘曲变形量最小化。     

鄂尔多斯盆地玉家湾油田注水效果分析及调整方案

玉家湾油田属于低孔特低渗油藏,采取压裂方式投产,目前已进入注水开发阶段。通过分析该区的注水动态和驱油效率,对注水效果进行评价,及时掌握地下油水运动规律。最后针对注水过程中存在的问题,给出具体的调整方案,保证高产稳产,提高油田采收率。     

Should few retrieved oocytes be as an indication for intracytoplasmic sperm injection?

Objective

To reevaluate whether relatively few oocytes obtained in one cycle are an indication for intracytoplasmic sperm injection (ICSI).

Methods

A total of 406 cycles with three or fewer retrieved oocytes performed in 396 non-male infertile couples were retrospectively reviewed. Cycles were classified into three groups by different fertilization techniques: the in vitro fertilization (IVF) group, insemination with conventional IVF; the ICSI group, insemination with ICSI though semen parameters were normal; and the rescue ICSI group, re-insemination with ICSI after conventional IVF failure.

Results

The ICSI group resulted in higher normal fertilization compared with the conventional IVF group. Correspondingly, the cycle cancellation rate was decreased in the ICSI group, though it was not statistically significant. The clinical pregnancy rate and implantation rate were lower in the ICSI group compared with the conventional IVF group. Rescue ICSI was a method to avert total fertilization failure in conventional IVF, increasing fertilization and ensuring embryo availability for transfer, but the normal fertilization was the lowest due to delayed insemination and the chance of pregnancy was very little.

Conclusions

Obtaining only few oocytes in one cycle is not considered as an indication for ICSI when the sperm sample is apparently normal. Rescue ICSI is either not recommended if conventional insemination fails. Such patients should not be subjected to the unnecessary costs and potential risks of ICSI.     

区段灌注技术-场放大进样-毛细管电泳手性拆分山莨菪碱

首次采用结合区段灌注技术及场放大进样的毛细管电泳技术对山莨菪碱四种异构体进行了拆分。详细探讨了溶液pH值、拆分试剂含量、分离缓冲充入时间、分离电压等对测定的影响,优化了实验条件。在75mmol L-1Tris-H3PO4(pH 3.5)为分离缓冲溶液,1.7%羧甲基-β-环糊精(CM-β-CD,1.0psi,90 s)为拆分试剂,分离电压17.5 kV条件下,23分钟内完成山莨菪碱四种异构体分离。并通过场放大进样进一步提高了测定的灵敏度。该方法成功应用于测定颠茄制剂中山莨菪碱,结果满意。     

Giving the User a Voice: Capturing Impact Through the Interjection of User Impact Surveys into the Information Retrieval Workflow

This article discusses a novel approach being developed at Oregon State University Libraries to move beyond usage statistics as a method to capture the larger impact of a specific set of resources for faculty. Utilizing a custom developed survey application, Oregon State University collection development librarians are able to modify the proxy workflow, inserting a point-of-use survey, allowing data collection to occur at the point of need and only on specific resources of interest.     

铜的流动注射光散射法测定

利用自制的流通池,提出了流动注射分析与光散射光谱法联用的测定技术;探讨了铜的流动注射和光散射光谱测定工作条件,铜的线性范围为0～400μg/mL,检出限为3.266μg/mL,测定频率为48次/h;实验结果表明所建立的方法快速、所需的化学试剂少.