某型航空发动机电缆插头尾夹装配工艺研究

针对某型航空发动机电缆插头尾夹装配工艺缺陷导致的断线故障,基于故障机理分析,开展电缆插头尾夹装配工艺改进研究,针对性制订了装配工艺改进方法,并通过抗拉对比试验、振动对比试验和有限元仿真分析对工艺改进前后样件进行了试验验证和仿真验证。验证结果表明,改进后的安装工艺,通过提高夹装辅材弹性模量,增大插头导线对外部振动能量的阻尼强度,可有效削弱插头内部导线对外部振动、拉扯的影响,对降低该型航空发动机电缆断线故障概率具有显著作用。采用的分析思路、试验方法和有关结论,可用于相似结构的电缆插头断线故障的机理分析和故障控制方法制订。

实验大鼠连续断尾取血法的报告

目的探讨从实验大鼠体内连续取血的适宜方法。方法使大鼠自然运动使毛细血管充血,消毒后断尾取血。结果在在整个采血过程中,大鼠比较平静,所取血液无溶血现象发生。结论此法简单、经济、实用,可保证采到足量的血,又可分次连续取血,建议进一步推广。

基于部分采样点辅助校正OFDM信号的准无损压缩算法

传统的正交频分复用(Orthogonal frequency division multiplexing,OFDM)信号压缩算法由于低的压缩比和低的信号量化误差比(Signal to quantization-error ratio,SQR)造成较高的误码率,无法满足OFDM系统的需求。为了实现高的压缩比和低的误码率,提出了一种联合削峰尾插(Clipping with tail plug,CTP)技术、几何级数压扩(Geometric series companding,GSC)技术及部分采样点校正(Partial sample calibration,PSC)技术的准无损压缩算法。计算机仿真结果表明,对于4096-正交幅度调制(Quadrature amplitude modulation,QAM)的OFDM信号,压缩比最高可达1.86∶1,误码率低于10-7,量化误差对应的平均SQR高达70dB,因而能够很好地满足光纤到分配点+千兆数字用户线路(Fiber to the distribution point+GCga digital subscriber line,FTTdp+GDSL)系统的需求。

反尾夹在床边负压吸引管固定的应用

在重瘟病人治疗中，为保持呼吸道通畅，需要反复长期吸痰，负压吸引管及吸痰管的接头的放置位置是临床护理人员迫切需要解决的问题，传统方法是在床头系一支玻璃消毒试管或消毒瓶子里暂时放置，有的瓶子直接放在床底下，或者放于吸引器上；中心负压吸引管连接吸痰管一端的接口处包裹一次性手套，压于床垫下，或者放入用别针固定在床头的布兜里，另置于床头简易布兜，以上方法都出现吸引管随意盘旋或散落于地下。这些方法既不美观、放置不牢固，吸引管易脱出，又易造成工作人员或患者的针刺伤；更重要的是不能有效保证吸痰管接头的清洁，而且不符合保持无茵清洁状态，给患者带来呼吸道感染的危险，有研究报道，确保吸引器管接口的清洁是保证治疗质量，防止医院感染的重要环节。由于吸痰管重心问题固定不牢而倾倒及按预防医院内感染原则，我们针对以上情况，在2010年1月起巧妙的将反尾夹用于吸痰用吸引管在床边固定的应用，解决了吸引管及吸痰管的放置问题，近1年来在临床使用中得到医护人员的一致肯定，应用效果好，现报道如下。

一种简易、多用途的小鼠固定装置

目的:介绍一种简易、多用途的小鼠固定装置的制作和使用方法。方法:选用废弃的50 m L离心管,按设计方案进行切割、组装制成简易小鼠固定装置。选取60只小鼠,随机分为2组,对照组采用传统固定方法,研究组则采用本装置固定,先后对小鼠进行尾静脉注射、断尾采血、膝关节腔内注射,观察比较两组操作时间和成功率等指标。结果:单个50 mL离心管仅重约12 g,制作时间约15 min。对照组和研究组小鼠尾静脉注射时间分别是(32.10±1.97)s和(30.27±2.20)s,成功率均为100%,断尾采血时间分别是(30.10±1.73)s和(28.67±1.55)s,成功率也均为100%,两组在操作时间上差异均具有统计学意义(P<0.01),而在成功率方面均无统计学差异(P>0.05)。两组膝关节腔内注射时间分别是(40.77±2.73)s和(38.73±2.16)s,成功率分别为83.33%和95.00%,两组在操作时间及成功率方面差异均具有统计学意义(P<0.05)。结论:该小鼠固定装置具有材料易得、制作简单、携带方便、用途多样等优点,为实验小鼠的固定提供了一种新的安全、实用的方法。

Evaluation of the analgesic activity of ethyl acetate,methanol and aqueous extracts of Pleurotus eous mushroom

Objective:To evaluate the analgesic activity of the ethyl acetate,methanol and aqueous extracts of Plewotus eous(P.eous) mushroom.Methods:The dried fruiting bodies were extracted with ethyl acetate,methanol and water.The analgesic effect of extracts of P.eous were investigated at doses 250 500 and 1 000 mg/kg body weight,using acetic-acid induced writhing,hot-plate,tail immersion and tail-clip tests.Results:P.eous extracts produced significant reduction in number of writhes induced by intraperitoneal injection of acetic-acid(P【0.05).Moreover,in hot-plate and tail immersion test,all the three extracts significantly raised the pain threshold at different time of observation(0-60 min) in comparison with control(P【0.05).In tail-clip test the extracts also caused a significant inhibition of pain at both the doses used(P【0.05).Conclusions:The results of present study suggest that extracts of P.eous possess potent analgesic property and could serve as a base for future drugs.

Phytocheniical and pharmacological evaluation of prop roots of Pandanus fascicularis Lam

Objective:To evaluate the anti-inflammatory and analgesic activities of the ethanol and aqueous extracts of prop roots of Pandanus fascicularis(P.fascicularis) Lam(pandanaceae).And provide experimental evidence for its traditional use such as rheumatoid arthritis and spasmodic. Methods:The anti-inflammatory activity was observed by carrageenan-induced edema of the hind paw of rats.Analgesic activities of prop roots of P.fascicularis were determined using acetic acid induced writhing model and tail clip method in mice and rat,respectively.The ethanol fraction was then subjected to chromatographic analysis and a compound has been isolated and characterized by IR,~1H-NMR and mass spectroscopy.Results:Edema suppressant effect of ethanol extract was found to be 37.03%inhibition whereas aqueous extract was found to be 63.22%inhibition after 3 h which was nearly equivalent to that of 10 mg/kg of indomethacin (67.81%).Percentage inhibition of writhing compared to control were 63.15%,54.38%,14.90%for aspirin,aqueous extract and ethanolic extract,respectively.Both ethanol and aqueous extracts show significant activity against appropriate controls after 60 min of treatment on tail clip method. The structure of the isolated compound is may be characterized as Hepta deca-5-ene-l-ol by analysis it’s IR,H-NMR and mass spectroscopy data.Conclusions:The extracts of prop roots of P.fascicularis produce significant analgesic and anti-inflammatory activities,supporting the traditional application of this herb in treating various diseases associated with inflammation and pain.

办公双尾夹在腹透中的巧用

长期行腹膜透析的患者，在腹透放液过程中，由于腹透液的重力、自身活动等原因，常常因为牵拉外接管导致腹透管出口处皮肤红肿、发炎甚至发生导管脱落现象。为此，我们应用办公双尾夹予固定，经临床应用，得到了较多患者的认可。现介绍如下。

Evaluation of anti-nociceptive activity of methanolic extract of Tecomaria capensis Thunb.(Bignoniaceae) leaves in rats

Objective:To evaluate the ann-nociceptive activity of Tecomaria capensls(T.capensis) leaves extract(TCLE) using different models in rats by acetic acid induced writhing test,(b) tail-flick test(c) tail-clip test.Methods:TCLE(100,300,1000 and 2000 mg/kg body wt.) was given to rats orally to observe acute toxicity for 14 d.Then test drug TCLE were given at dose of 100,200 and 500 mg/kg p.o.and standard drug aspirin were given at a dose of 100 mg/kg p.o.Results:No mortality was reported even after 14 d.This indicates that the methanol extract is safe up to a single dose of 2 000 mg/kg body weight TCLE(100,200 and 500 mg/kg p.o.) significandy inhibited abdominal constrictions(writhing) induced by acetic acid and increased the latency period in the tail flick and tail clip test.TCLE at the dose of 500 mg/kg showed significant anti-nociceptive activity compared to standard aspirin.Discussions:The results of this study show that methanol extract of T.capensis possesses anti-nociceptive activity which may be mediated by the central and peripheral mechanisms.

高速线材产品尾部夹痕的控制

分析了高速线材尾部夹痕的形成原因,根据吐丝机夹送辊的内部结构和动作原理,说明了影响产品尾部夹痕的主要因素是气缸气压、限位机构的稳固性、夹送辊压下动作的行程。给出了降低夹送辊动作时内部机构冲击力的方法。并对辊缝值调整、进口导卫安装提出了工艺改进方案,有效减轻了线材产品尾部夹痕,提高了产品尺寸精度。

肝郁证动物模型造模方法与模型评价研究进展

文章评述了肝郁证动物模型的造模方法,总体分为单因素造模法、多因素造模法两大类。单因素造模法包括病因造模法、病理造模法。多因素造模法主要为复合造模,包括病因造模法合病理造模法、病因造模法合病因造模法。模型评价方法总体分为造模后检验法、宏观表征、微观指标、反证方剂。并对肝郁证动物模型的现代临床应用进行总结归纳。目前肝郁证动物模型的造模方法尚未得到公认,且主要存在造模时给药剂量不精确,复合造模方法种类较多、选择随机,运用化学方法造模对动物模型损伤较大等问题。模型评价中主要存在微观指标混乱、宏观指标不准确、反证方剂选择混乱,以小型动物复制模型缺乏舌象与脉象等问题。