基于3G无线传感的桥梁集群健康监测系统

介绍了一种基于3G无线传感的桥梁集群健康实时监测系统。系统将3G无线模块与ZIGBEE无线传感网络模块统一于AT91SAM9G20 ARM微处理器芯片,嵌入LINUX操作系统,设计了桥梁健康监测系统下位机系统。采用VC6.0软件,设计了桥梁健康监测中心上位机系统。在桥梁集群上80个采集点实际应用表明,该系统运行稳定,数据存储和无线传输稳定可靠,可满足桥梁集群无线健康监测的需求。     

光纤传感器对混凝土结构钢筋腐蚀监测的研究

本文报道了光纤传感器用于混凝土结构钢筋腐蚀监测的实验研究结果。该传感方案基于用Fe-C合金膜局部取代光纤介质包层,构成腐蚀敏感膜,从而获取金属腐蚀信息。为了监测钢筋在实际混凝土结构中的腐蚀行为。本文提出了可以埋入到结构中的光纤腐蚀传感器（FOCS）,并对埋入工艺进行研究,通过人造裂缝将防冰盐（NaCl）溶液加入到混凝土结构钢筋处并进行加速腐蚀,用紧贴钢筋铺设的FOCS监测钢筋腐蚀过程中输出光功率的变化,结果表明FOCS输出光功率变化和腐蚀介质的pH值变化有良好的对应关系,并与腐蚀电化学理论描述相一致,证实了所提传感器方案的可行性。     

疲劳裂纹扩展的实时健康监测

结构中微裂纹的产生和扩展是影响结构安全及其寿命的重要因素,在裂纹产生初期就将其监测出来对于提高结构安全性来说至关重要。目前研究这一领域的学者很多,但大多都集中在孔洞等较大尺寸损伤的在线监测阶段。该文研究了真实疲劳裂纹扩展的实时在线监测方法。采用主动Lamb波监测技术及机电阻抗技术对铝试件的真实疲劳裂纹扩展情况进行了监测和分析,给出了裂纹扩展程度与信号损伤参数间的关系曲线,并对两种监测方法进行了对比,对实验结果进行了讨论。     

LED电视在2D模式下的视觉健康舒适度测试研究

通过客观量测人眼观视时的各项视觉生理指标,并将各项指标嵌入人眼健康舒适度评价模型进行分析运算。经由583人次的人因实验,从视觉健康舒适度、电视屏幕人眼色觉客观量化反馈以及操控可用性3个方面对12款主流品牌的LED电视样机的视觉健康舒适度与人机交互设计进行了测试与评价。     

北京大学“你好营养”健康宣教公益团队社会实践活动探索

北京大学“你好营养”健康宣教公益团队是由北医营养与食品卫生系33名研究生组成,在本院系专家教授的指导下,以公益讲座、网站宣传等形式为社区居民服务,通过健康理念传播提高公众营养和健康意识,实现“履行社会责任、知识回报社会”。2010年4月到8月,“你好营养”团队以城乡结合部社区居民为重点服务人群,在北京和太原两地完成12个社区共20场营养健康宣教和营养咨询服务系列活动,参与人数达3 500余人,多家媒体给予关注报道。团队正在实施和规划中的活动包括响应相关政策,在北京逐步建立多个“营养改善示范社区”,在全国医     

Saccharomyces cerevisiae strains AWRI 838, Lalvin EC1118 and Maurivin PDM do not produce excessive sulfur dioxide in white wine fermentations

The formation of sulfur dioxide (SO₂) by the related Saccharomyces cerevisiae strains AWRI 838, Lalvin EC11 18 and Maurivin PDM has been determined in white wines produced by laboratory-scale fermentation. Three different preparations of these strains, available for vinification in 1995, were indistinguishable based on production of SO₂. None of the physico-chemical factors investigated could stimulate an over-production of SO₂, and any changes in its concentration were independent of juice pH, sugar content, exposure to air, clarity, initial concentration of SO₂, and grape variety. Only fermentation without exposure to air could affect the concentration of SO₂, reducing it by 13–15% in the final wines. Under the conditions tested, changes in the concentration of SO₂ in wines produced with AWRI 838 and related strains would not account for wines which resist malolactic fermentation.     

不确定健康评估下基于状态维修的效果研究

基于状态维修（CBM）已成为复杂装备的新兴保障模式,装备健康评估结果是触发CBM的依据,不确定的健康评估势必会对装备的CBM行为产生影响,进而影响装备的战备完好性。针对该问题,首先定义正确评估率、过评估率和欠评估率指标定量描述装备健康评估的不确定性,应用稳态可用度描述装备的CBM效果。然后利用状态离散马尔可夫过程和稳态平衡原理,建立稳态可用度与正确评估率、过评估率之间的关联关系,为健康评估理论的进一步研究提供依据。最后通过具体算例验证了本文所提方法的可行性和合理性。     

Emerging Wearable Sensors for Plant Health Monitoring

Emerging plant diseases, caused by pathogens, pests, and climate change, are critical threats to not only the natural ecosystem but also human life. To mitigate crop loss due to various biotic and abiotic stresses, new sensor technologies to monitor plant health, predict, and track plant diseases in real time are desired. Wearable electronics have recently been developed for human health monitoring. However, the application of wearable electronics to agriculture and plant science is in its infancy. Wearable technologies mean that the sensors will be directly placed on the surfaces of plant organs such as leaves and stems. The sensors are designed to detect the status of plant health by profiling various trait biomarkers and microenvironmental parameters, transducing bio-signals to electric readout for data analytics. In this perspective, the recent progress in wearable plant sensors is summarized and they are categorized by the functionality, namely plant growth sensors, physiology, and microclimate sensors, chemical sensors, and multifunctional sensors. The design and mechanism of each type of wearable sensors are discussed and their applications to address the current challenges of precision agriculture are highlighted. Finally, challenges and perspectives for the future development of wearable plant sensors are presented.     

某型发射装备伴随保障系统

针对某型发射装备维修保障系统需求,构建以保障车为核心的发射装备伴随保障系统.通过信息集成、全资可视化、嵌入式传感等技术,实现武器装备基于准实时装备状态信息的综合诊断、健康管理及辅助决策,系统与业务信息网的接入,实现保障信息横向共享和交互,辅以远程技术支援等手段弥补战场保障技术力量的不足,并对该系统的组成结构与系统功能、主要组成设备的功能、系统软件组成与功能进行较全面的设计.分析结果表明:该系统实现了基于准实时的装备状态信息的综合诊断、健康管理及辅助决策,通过网络的接入,可实现保障信息的横向共享、交互及远程技术支援,为装备保障的一体化联合优化决策提供数据和技术支持.     

亚健康态胸痹的红外热图特征探讨

本研究通过对自述胸闷或发作性心胸疼痛,而客观检查未见阳性发现的人群作为研究对象,采用红外热成像检查,探索亚健康态胸痹的红外热图特征.方法:选择符合条件的受试者,将健康组、亚健康态胸痹组及胸痹组共260例进行胸部红外热图对比分析.结果:(1)亚健康态胸痹组的症状表现程度与红外热图异常变化相符;(2)各组间、各区域的红外热图改变,具有显著的统计学意义.结论:胸部红外热图可作为判断亚健康态胸痹的客观依据之一.