滤筒式可移动除尘器净化效率测定探讨

[目的]对移动武除尘器的净化效率进行测定,为建设项目职业病危害控制效果评价中对卫生工程防护措施的效果量化评价提供技术支撑.[方法]测量除尘器进风口的静压和动压,测量现场的温度和气压,测量除尘器进出口面积,用自动烟尘烟气测试仪采集烟尘样品,测定除尘器进出口烟尘浓度,计算出移动武除尘器的净化效率.[结果]测定的两种移动武除尘器净化效率分别为92.3％和93.4％.[结论]评定除尘净化效率时,由于含尘气量、粉尘成分、粉尘浓度等的变化,实测值与除尘器标称的除尘净化效率之间可能产生较大偏差.用分级除尘净化效率表示,可以减少此偏差.     

Estimation of the Biphasic Property in a Female’s Menstrual Cycle from Cutaneous Temperature Measured During Sleep

This paper proposes a method to estimate a woman’s menstrual cycle based on the hidden Markov model (HMM). A tiny device was developed that attaches around the abdominal region to measure cutaneous temperature at 10-min intervals during sleep. The measured temperature data were encoded as a two-dimensional image (QR code, i.e., quick response code) and displayed in the LCD window of the device. A mobile phone captured the QR code image, decoded the information and transmitted the data to a database server. The collected data were analyzed by three steps to estimate the biphasic temperature property in a menstrual cycle. The key step was an HMM-based step between preprocessing and postprocessing. A discrete Markov model, with two hidden phases, was assumed to represent higher- and lower-temperature phases during a menstrual cycle. The proposed method was verified by the data collected from 30 female participants, aged from 14 to 46, over six consecutive months. By comparing the estimated results with individual records from the participants, 71.6% of 190 menstrual cycles were correctly estimated. The sensitivity and positive predictability were 91.8 and 96.6%, respectively. This objective evaluation provides a promising approach for managing premenstrual syndrome and birth control.     

Autologous embedded foreign body of mobile tongue

Foreign bodies of upper aerodigestive tract are common otorhinolarygological emergencies. The foreign bodies of mobile tongue are however very rare and there are only limited case reports in literature. The case of a young female with an autologous foreign body mobile tongue with unusual presentation is presented.     

移动电话使用和脑肿瘤的关系

移动电话(mobile phone,MP)产生的电磁辐射主要作用于中枢神经系统。近年来脑肿瘤的发病率逐渐增加,尤其在青年人群中脑胶质瘤的发病率较高,二者是否存在相关性?本文就MP是否与脑肿瘤有关,对国内外研究资料进行复习综述。     

新生儿破伤风流行动态分析

目的:为了解龙岗区新生儿破伤风流行病学特征,掌握其流行动态,为政府相关部门制定干预措施提供依据,降低新生儿破伤风的发病率。方法:利用深圳市法定传染病报告系统和新生儿破伤风监测系统获得新生儿破伤风资料并进行统计分析。结果:龙岗区新生儿破伤风发病率和病死率呈逐年下降趋势;病例全部为流动人口;分娩方式均为院外分娩;94.74%的病例发病年龄在生后2周内;只有13.16%的母亲在孕期到医院进行过产前检查(次数≥1),85.09%的母亲未接种过破伤风类毒素疫苗。结论:结合新生儿破伤风的发病机制及流行病学特点,加强流动人口孕产妇管理,普及住院分娩、新法接生、开展育龄妇女破伤风类毒素接种是预防新生儿破伤风的有效措施。     

移动电话电磁辐射与脑肿瘤关系的Meta分析

目的综合分析移动电话电磁辐射与脑肿瘤的关系。方法对近十年来国内外公开发表的相关病例对照研究进行meta分析。结果移动电话电磁辐射与脑肿瘤之间无明显联系。但使用移动电话的同侧大脑半球发生肿瘤的风险增加,综合OR值为1.784(1.136～2.804),失安全系数为34。结论现有的文献不支持移动电话电磁辐射导致脑肿瘤的观点,但移动电话的使用年限与脑肿瘤的关系及使用同侧大脑发生肿瘤的危险值得进一步研究。     

微气泡在医学超声成像中的应用

介绍微气泡作为造影剂的基本工作原理及临床应用     

66例新生儿破伤风流行因素分析及控制措施探讨

目的了解惠州市新生儿破伤风流行病学特征，掌握其流行因素和现状，为进一步制定干预措施提供依据。方法收集2005年1月-2007年12月救治的新生儿破伤风资料进行统计分析。结果66例救治的新生儿破伤风病病例全部为农村人口或流动人口，分娩方式均为院外分娩、旧法接生，只有10．61％的母亲在孕期到医院进行过产前检查，所有母亲未接种过破伤风类毒素疫苗。结论加强流动人口孕产妇管理，普及住院分娩、新法接生、开展育龄妇女破伤风类毒素接种是预防新生儿破伤风的有效措施。     

云南龙陵县1991～2005年疟疾监测结果分析

目的掌握灭疟后期疟疾流行现状，为制定有效管理措施提供科学依据。方法分析龙陵县1991～2005年疟疾监测资料。结果1991～2005年累计报告疟疾病例3185例，年平均发病率为8．14／万；发热病人年平均血检率4．59％、血栓阳性率1．75％；监测流动人口疟疾病例2661例，占疟疾总数的84．50％；居民平均带虫率为0．8％。结论龙陵县仍是输入性间日疟为主的混合流行区，应加强流动人口疟疾监测，建立长效机制、规范抗疟措施。