Testing a revised inlet for the personal dust monitor

A person-wearable dust monitor that provides nearly real-time, mass-based readings of respirable dust was developed for use in underground coal mines. This personal dust monitor (PDM) combined dust sampling instrumentation with a cap lamp (and battery) into one belt-wearable unit, with the air inlet mounted on the cap lamp. However, obsolescence of belt-carried cap lamp and batteries in coal mining ensued and led end users to request that the cap lamp and battery be removed from the PDM. Removal of these components necessitated the design of a new air inlet to be worn on the miner’s lapel. The revised inlet was tested for dust collection equivalency against the original cap-mounted inlet design. Using calculated inlet respirable fractions and measured dust mass collection, the performance of the two inlets is shown to be similar. The new inlet requires a 1.02 factor for converting dust masses obtained from it to equivalent masses collected from the original inlet.     

面部脂溢性疾病的综合治疗

目的总结面部脂溢性疾病的综合治疗方法及疗效.方法以硫酸锌溶液喷雾面部后,清除脓液及脂拴,再以0.5%甲硝唑溶液行超声波导入,之后以痤疮霜加冷模粉倒模.结果一个疗程治愈率达80%,总有效率93%.结论脂溢性疾病的综合治疗方法及疗效,较我们以往采用的治疗方法明显缩短了治愈时间,提高了治愈率,是一个较好的治疗方法.     

不同海拔高度对医用PSA制氧机特性影响的试验研究

目的:提高车辆驾驶员医用PSA制氧机在高原地区的适应性、可靠性寻求依据。方法:利用高原人工(低气压)环境PSA制氧系统性能模拟试验台,模拟试验研究了医用PSA制氧机在不同海拔高度、不同氧流量、不同温度和不同氧体积分数滞后时间等与氧体积分数的相互关系及影响,并模拟对比试验了与青藏线5个典型地域不同海拔高度实地自然环境条件下制氧体积分数和进气增压前后制氧性能变化规律。结果:随海拔升高,大气压力下降,分子筛PSA制氧系统供气压力增大时出口氧体积分数值增大,反之减小。同时随氧流量的增加对PSA制氧体积分数下降比较明显。结论:氧体积分数模拟与实地对比对PSA制氧系统的影响及变化规律基本一致。     

聚焦超声治疗宫颈糜烂110例疗效观察

宫颈糜烂是妇女最常见的一种疾病,是宫颈炎症中最易发展为宫颈癌的一组病变,它严重威胁着广大妇女的健康.随着社会的发展,目前宫颈糜烂的好发人群已逐渐由原来的已育妇女转变为年轻、未孕的妇女.宫颈糜烂采用聚焦超声治疗,可降低宫颈癌的发病可能.我院门诊2009年3月～2009年12月对就诊的宫颈糜烂患者进行聚焦超声治疗,并对其进行随访观察.     

超声对桥本甲状腺炎的诊断价值

桥本甲状腺炎（hashimoto＇s thyroiditis,HT）又称慢性淋巴细胞性甲状腺炎,为自身免疫性疾病,本病的发病率近年有上升趋势,是临床较常见的甲状腺炎,本研究分析86例桥本甲状腺炎的声像图特点,旨在探讨超声对此疾病的诊断价值.     

单翼迷宫灌水器进口流场数值模拟与结构优化

针对单翼迷宫式滴灌灌水器工程应用中,大多数堵塞都发生在灌水器进口及其邻近区域的问题,对单翼迷宫式滴灌灌水器进口结构特性和水力性能进行分析,并对内部流场的计算流体进行动力学(CFD)数值模拟研究,发现目前广泛使用的单翼迷宫式滴灌灌水器的进口在实现灌水器多进口安全保障、过滤、抗堵塞等功能方面的设计存在不足之处.应用CAD-CFD技术改进单翼迷宫式滴灌灌水器进口的结构,优化其水力性能.改进后的灌水器5个进口流量基本相同,流速分布也较为均匀.不存在超低流速区,能有效减少灌水器进口的沉积和堵塞,提高灌水器的抗堵塞能力,实现了多进口的安全保障功能.     

一种基于有限元/边界元耦合方法的管道进口声传播及声辐射模型

本文发展了一种基于有限元和边界元耦合方法的管道进口声传播及声辐射计算模型。该模型将整个声场分为内部有限域和外部无界域，分别用有限元和边界元方法求解控制方程，在二者之间的界面上使用具有物理意义的声阻抗参数进行匹配，并通过一种快速迭代方法实现全声场求解。这种迭代方法可以保证有限元刚度矩阵等带宽以及对称的特性不被破坏，有助于提高计算效率。该模型先得到了Levine and Schwinger标准解的检验，进而在无流动情况下对于简化的航发短舱进口管道模型进行了噪声辐射现象的数值模拟，最后基于计算结果分析了声衬对远场声辐射的影响。     

不同反压下椭圆形隔离段流场特征与气动性能

在反压条件下,对椭圆形等直隔离段进行了全三维数值仿真研究。结果表明：在对称的几何条件和边界条件以及均匀来流条件下，当来流马赫数较小时，流场与激波串结构基本对称；当来流马赫数较大（大于2）时，流场与激波串结构出现明显不对称现象，并且随着来流马赫数增大，这种不对称现象加剧。椭圆形隔离段抗反压能力随着长短半轴比减小逐渐增强，出口马赫数和温升比基本不受长短半轴比影响。不同来流马赫数下，当隔离段承受最大反压时，出口马赫数变化不大。     

Prediction of herb-drug interactions involving consumption of furanocoumarin-mixtures and cytochrome P450 1A2-mediated caffeine metabolism inhibition in humans

Herb-drug interactions (HDI) has become important due to the increasing popularity of natural health product consumption worldwide. HDI is difficult to predict as botanical drugs usually contain complex phytochemical-mixtures, which interact with drug metabolism. Currently, there is no specific pharmacological tool to predict HDI since almost all in vitro-in vivo-extrapolation (IVIVE) Drug-Drug Interaction (DDI) models deal with one inhibitor-drug and one victim-drug. The objectives were to modify-two IVIVE models for the prediction of in vivo interaction between caffeine and furanocoumarin-containing herbs, and to confirm model predictions by comparing the DDI predictive results with actual human data. The models were modified to predict in vivo herb-caffeine interaction using the same set of inhibition constants but different integrated dose/concentration of furanocoumarin mixtures in the liver. Different hepatic inlet inhibitor concentration ([I]_H) surrogates were used for each furanocoumarin. In the first (hybrid) model, the [I]_H was predicted using the concentration-addition model for chemical-mixtures. In the second model, the [I]_H was calculated by adding individual furanocoumarins together. Once [I]_H values were determined, the models predicted an area-under-curve-ratio (AUCR) value of each interaction. The results indicate that both models were able to predict the experimental AUCR of herbal products reasonably well. The DDI model approaches described in this study may be applicable to health supplements and functional foods also.     

H2O/CO2污染对煤油燃料超声速燃烧影响数值研究

在纯净空气与H₂O/ CO₂污染空气来流对比试验结果基础上,采用数值计算方法和化学动力学方法,研究了H₂O和CO₂污染组分对煤油燃料超声速燃烧的影响,获得了试验手段难以得到的燃烧室流场参数和性能数据。完成了相应的煤油燃料超声速燃烧室二维数值计算,其中匹配了进口总温、总压、马赫数、氧气摩尔分数和工作当量油气比。将数值计算结果与相应试验测量值进行了对比分析,并结合燃烧室流场数据、性能参数分析了H₂O和CO₂污染的动力学影响、以及对燃烧室性能的影响。研究表明:(1)数值计算结果与实验测量值总体上吻合,两种手段均体现了纯净空气来流时不同煤油当量油气比的燃烧室性能,并反映了一致的“污染效应”影响趋势；(2) H₂O污染、H₂O+ CO₂污染的存在降低了煤油燃料超声速燃烧室性能,体现在燃烧诱导压升、燃烧效率、流向冲量增量的下降,而且随着污染组分含量的增加,燃烧室性能下降越加显著。 