飞行器健康监控的概念及其发展

飞行器健康监控技术是当前国内外的一个研究热点，其应用对于提高飞行器的可靠性、安全性和经济性具有重要的意义。文章从健康监控技术的概念、发展及相关技术三个方面进行了介绍。     

Phylogenetic relationships of millipedes in the subclass Penicillata (Diplopoda) with a key to the genera

Bristly millipedes (subclass Penicillata, order Polyxenida) are minute diplopods characterised by uncalcified cuticle and a body covered with unique tufts of bristles. The order is found worldwide and comprises less than 200 described species divided into three families, with many of the species and genera being poorly known. The first evolutionary analysis of the order presented here utilises both molecular (COI, 18S rRNA and 16S rRNA) and morphological data to examine monophyly of the families and subfamilies and the evolutionary relationships between them. Maximum likelihood analysis was based on molecular data only, whereas parsimony analyses were based on molecular data as well as combined morphological and molecular data. The results of these analyses with two different optimality criteria were incongruent in many aspects. Unlike parsimony, the likelihood result found strong support for a basal position of the family Synxenidae and separation of the order into two monophyletic clades corresponding to the two superfamilies Synxenoidea, containing the family Synxenidae, and Polyxenoidea, containing the families Polyxenidae and Lophoproctidae. Parsimony results did not support the existence of the two superfamilies. Both analyses resolved the family Synxenidae as monophyletic and Polyxenidae as polyphyletic, whereas the family Lophoproctidae was shown to be paraphyletic in likelihood and monophyletic in parsimony analysis. The subfamilies Monographinae and Polyxeninae were found to be monophyletic in the likelihood tree but parsimony suggested paraphyly of both. The results suggest that further revision of the systematics of the Polyxenida may be necessary. However, a much larger molecular data set will be necessary to clarify and provide stronger nodal support for phylogenetic trees and to confirm the relationships, particularly of the families Polyxenidae and Lophoproctidae. Molecular identification is likely to be an important tool for this taxonomically challenging order in future. A simplified key to the genera is provided.     

视频数据挖掘的非接触式桥梁振动监测

为克服传统桥梁监测技术施工难、成本高和观测点少等不足,利用视觉技术实现了非接触式桥梁振动状态监测。该方法包含视频数据采集、视频数据分析与结果可视化等3个环节。其中,视频数据分析环节又包含3个步骤:首先,对视频中的稳定像素点进行定位;然后,根据视频中稳定像素点的数值变化,由视频数据挖掘方法建立视频热噪声模型;最后,由视频热噪声模型计算出视频中桥梁各局部位置上的振动频率。实验结果表明,该方法可有效侦测到桥梁可见结构部件上出现的人眼不易察觉的微弱振动,并对桥梁不同局部位置上出现的振动频率进行同步定量测算,从而提供了一种便捷高效、成本合理、通用性好的桥梁结构健康监测新途径。     

一株高效絮凝剂产生菌的分离和鉴定

应用多相分类手段对絮凝菌株XHUA9进行了分类研究,并对分离提纯的发酵产物进行紫外和红外分析.基于16S rRNA基因序列的系统发育分析表明,该菌和模式菌株Paenibacillus hunanensis的序列同源性为96.7%,基因组DNA-DNA同源性杂交值为51.6%.菌株的主要极性脂肪酸为双磷脂酰甘油、磷脂酰甘油、磷脂酰乙醇胺和磷脂酰肌醇.菌株优势醌为MK-7,主要优势脂肪酸为anteiso-C15:0和C16:0.菌株(G+C)摩尔分数为51.9%.根据上述结果,菌株XHUA9鉴定为类芽孢杆菌属内的新种,命名为Paenibacillus shenyangensis sp.nov..紫外扫描和红外检测等结果表明,菌株XHUA9所产絮凝剂的主要成分为多糖类物质.     

The influence of home environmental factors and life style on children＇s respiratory health in Xi＇an

To assess associations between home indoor air environments and asthma,allergies and pneumonia,children aged 1–8 years were surveyed from 12 kindergartens in the city of Xi’an.2,020 questionnaires were responded with a response rate of 83.5%.The prevalences of doctor diagnosed asthma,hay fever,and pneumonia were 2.9%,3.6%,and 28.3%,respectively.Living close to a highway was a risk factor for current rhinitis(AOR 1.5,95%CI 1.2–1.8),eczema(AOR 1.7,95%CI 1.2–2.5),and diagnosed pneumonia(AOR 1.3,95%CI 1.0–1.6).Dampness problems in the home were associated with 50%–130%increases in the prevalences of asthma and allergy.Airing bed linen under sun-shine was protective,especially against rhinitis.Pet avoidance was consistently and significantly associated with asthma and allergy(AOR 1.3–2.4).Decoration of the home during children’s early life is a risk factor for current rhinitis(AOR 1.9,95%CI 1.3–2.9)and eczema(AOR 1.9,95%CI1.1–3.6).Risk factors for pneumonia were living in an apartment(AOR 1.4,95%CI 1.1–1.8),latex wall paint(AOR 1.3,95%CI 1.0–1.7),dampness(AOR 1.4–1.5),breast feeding\3 months(AOR 1.3,95%CI 1.0–1.7),never airing bed linen in sunshine(AOR 1.3,95%CI1.3–1.6),and cleaning children’s room less frequently than once per day(AOR 1.4,95%CI 1.1–1.7).This study demonstrates that home indoor environmental and life style factors may influence the health of children in Xi’an.     

基于RFID技术的安全跟车系统

为了提高行车安全性,基于RFID技术提出了一种安全跟车系统(SCFS).在此系统中,RFID标签部署在道路表面,为安装有RFID读卡器的车辆提供道路信息.系统根据标签中存储信息的时间特性,利用时间序列预测法,预测前车的行驶状态并估测两车之间的道路距离;结合当前行驶状态对车速进行适当调整,以保证行车安全.本文给出了3个系统性能评价指标,并进行仿真实验.结果表明,SCFS系统能够在不同跟车行驶状态下保证行车安全,避免追尾碰撞的发生.     

高校图书馆员的心理健康刍议

随着社会的发展,高校图书馆员的心理健康受到威胁。分析了高校图书馆员常见的心理问题,提出了维护馆员心理健康的有效措施。     

仪表图像二值化技术研究

仪表读数识别是智能抄表系统的重要组成部分，而仪表图像二值化是实现仪表读数识别的前提与基础。由于仪表图像在采集时，受工作环境和采集条件影响，采集质量较差。通过对采集图像处理与分析，找到了适合的二值化方法，提高了二值化效果。     

西藏林芝地区卫生人力资源现状调查

目的：通过对西藏林芝地区卫生服务机构人力资源现状调查分析,了解林芝地区卫生人力队伍现状,提出改善林芝地区卫生人才队伍策略。方法：采用随机分层抽样方法,对林芝地区445名卫生技术人员进行现场调查。结果：林芝地区卫生技术人员结构和配置不尽合理。结论：适当下放卫生系统人事自主管理权,调整卫生技术人员职称评聘条件等措施将有利于改善林芝地区卫生人员合理配置以及提高人员工作积极性。     

The Mental Health Education Development of China University Students

In 80s, 20th century, the policy、economy、culture of China, at the influence of China’s Open -door policy, strengthening the communication with other countries in the world, make China realize the importance of improving the labor quality. In addition, with the policy of quality education, the university students’ mental health education comes up. After its thirty-year development history, forms its unique working-system.