Thermal and cardiovascular strain imposed by motorcycle protective clothing under Australian summer conditions

Motorcycle protective clothing can be uncomfortably hot during summer, and this experiment was designed to evaluate the physiological significance of that burden. Twelve males participated in four, 90-min trials (cycling 30 W) across three environments (25, 30, 35 °C [all 40% relative humidity]). Clothing was modified between full and minimal injury protection. Both ensembles were tested at 25 °C, with only the more protective ensemble investigated at 30 and 35 °C. At 35 °C, auditory canal temperature rose at 0.02 °C min^?1 (SD 0.005), deviating from all other trials (p < 0.05). The thresholds for moderate (>38.5 °C) and profound hyperthermia (>40.0 °C) were predicted to occur within 105 min (SD 20.6) and 180 min (SD 33.0), respectively. Profound hyperthermia might eventuate in ~10 h at 30 °C, but should not occur at 25 °C. These outcomes demonstrate a need to enhance the heat dissipation capabilities of motorcycle clothing designed for summer use in hot climates, but without compromising impact protection.

Practitioner’s Summary:

Motorcycle protective clothing can be uncomfortably hot during summer. This experiment was designed to evaluate the physiological significance of this burden across climatic states. In the heat, moderate (>38.5 °C) and profound hyperthermia (>40.0 °C) were predicted to occur within 105 and 180 min, respectively.     

火焰温度场测试中的传感器动态特性补偿

在进行爆温测试时,爆炸伴随的高温火焰具有变化快、温度高、测试环境恶劣等特点.针对这种特定的测温场合,运用火焰温度源法研究了热电偶传感器在火焰温度场中的动态响应特性.为了减小热电偶的动态测量误差,通过粒子群优化算法(PSO)建立了测试系统的动态补偿滤波器模型.实验表明,这种研究方法有效地改善了热电偶的动态测量误差,对通过爆温测试进行弹丸热毁伤评价有一定的参考价值.     

基于LS-SVR的压力传感器温度自补偿策略

硅压阻式压力传感器在实际使用过程中受环境温度影响易发生温度漂移,同时传感器本身又存在一定的非线性,这使得传感器测量精度大幅度降低.针对传统的温度补偿方法中需引入温度传感器的情况,提出一种基于最小二乘支持向量回归(LS-SVR)的压力传感器温度自补偿策略,通过定义并测量传感器桥路自身参数获取温度信息实现温度补偿,而无需配置额外的温度传感器.通过粒子群算法和交叉验证对LS-SVR的参数进行了优化.实验结果表明:这种利用传感器自身桥路进行温度补偿的方法能够有效地消除压力传感器的温度漂移.补偿后测量精度达到0.1%FS.     

面向移动设备的温度感知的任务调度算法

由于志愿者分布式计算可以为计算量庞大的科研项目提供足够的计算能力,甚至比超级计算机的计算能力还要强大,因此,志愿者分布式计算技术受到了很多研究人员的关注,很多不同的志愿者分布式计算架构被广泛应用。以往的很多志愿者分布式计算架构通常考虑的志愿者主机是PC电脑,或者单纯地把移动设备当作PC电脑一样进行处理。由于移动设备的很多特性跟PC电脑存在着很大的差异,所以很多时候这些志愿者分布式计算架构并不能高效地处理同时拥有PC电脑和移动设备志愿者的志愿计算项目。针对志愿者分布式计算系统上两个主流的志愿者分布式计算任务调度方法——迭代计算的任务调度算法和先来先服务的调度算法FCFS在处理移动设备志愿者计算上存在着的不足,为了提高志愿者分布式计算平台的执行效率,提出了一个面向移动设备的温度感知的任务调度算法TATSA。实验结果表明,TATSA比主流的任务调度算法ISA和FCFS在移动设备志愿者计算时效率明显更高。     

基于无线传感器网络的多处网络机房温湿度双向监控系统

随着学校新校区建立,校区的不断扩大,网络应用不断增加,出现了多个网络机房.依据网络机房温湿度环境要求,为了防止计算机设备因温湿度等环境因素发生故障,应用无线传感器网络设计了温湿度监测系统.硬件设计了组网方式、温湿度采集节点、数据接收节点.软件上设计了节点控制程序,传感器、收发器、通信信道初始化程序等,实现了参数的传送、接收、处理.并进行了现场测试,测试结果与机房温湿度一致.     

基于Modbus总线的智能烘房温度监控系统的设计

为能实时方便地监控烘房的温度变化情况,设计了一套基于Modbus总线和组态王的温度监控系统。该系统可将每个烘房的温度值通过Modbus总线实时传送到上位机进行显示、存储、打印等,上位机采用组态王设计监控画面。监控系统运算处理后给出控制信号,通过Modbus总线传送给输出量控制模块,由该模块控制烘房电加热箱和风机工作情况。该监控系统提高了烘房温度监控的准确性、便捷性和工艺流程的自动化水平。     

Air temperature estimation with MSG-SEVIRI data: Calibration and validation of the TVX algorithm for the Iberian Peninsula

Air temperature can be estimated from remote sensing by combining information in thermal infrared and optical wavelengths. The empirical TVX algorithm is based on an estimated linear relationship between observed Land Surface Temperature (LST) and a Spectral Vegetation Index (NDVI). Air temperature is assumed to be equal to the LST corresponding to the effective full vegetation cover, and is found by extrapolating the line to a maximum value of NDVI_max. The algorithm has been tested and reported in the literature previously. However, the effect of vegetation types and climates and the potential variation in NDVI of the effective full cover has not been subject for investigation. The present study proposes a novel methodology to estimate NDVI_max that uses observed air temperature to calibrate the NDVI_max for each vegetation type. To assess the validity of this methodology, we have compared the accuracy of estimates using the new NDVI_max and the previous NDVI_max that have been proposed in literature with MSG-SEVIRI images in Spain during the year 2005. In addition, a spatio-temporal assessment of residuals has been performed to evaluate the accuracy of retrievals in terms of daily and seasonal variation, land cover, landscape heterogeneity and topography. Results showed that the new calibrated NDVI_max perform well, with a Mean Absolute Error ranging between 2.8 °C and 4 °C. In addition, vegetation-specific NDVI_max improve the accuracy compared with a unique NDVI_max.     

基于正反馈的多通道高精度温度检测系统

为了检测微热管的传热特性,采用Pt100温度传感器搭建了8路温度检测系统。该系统以MSP430单片机为下位机控制核心,利用集成的AD模块和UART模块完成A/D转换与通信等功能。上位机用VC++开发应用程序对多路温度信号进行数据拟合,将数据实时显示,并绘制8路温度曲线。通过加入正反馈电路,显著改善了输出线性度。系统测温范围为0～150℃,具有测温精度高,可靠性好,实时性强等优点。     

蒸发温度对电子鼻白酒评价的影响研究

采用气体传感器阵列对7种市售白酒进行了动态测量,并研究蒸发温度对白酒识别分类的影响.白酒样本分别在20,40,60,80℃蒸发后进行测量,在每个蒸发温度下结合主元分析(PCA)法,分析了传感器阵列信号与白酒的香型和酒精度特征之间的关系,以及所有白酒样本按蒸发温度划分的结果.结果表明:按香型和酒精度划分,60℃的分类结果...     

一种流量压力温度一体化传感器的设计

为了实现多参数综合测量,设计出一种小流量、压力、温度一体化传感器,该传感器主要由敏感元件和调理电路组成,信号输出采用0～5 V模拟输出.对传感器进行各项环境试验,试验结果表明:该传感器流量精度优于3％,压力精度优于0.2％,温度精度优于0.5％,流量热零点漂移小于0.2％ FS/℃,压力热零点漂移小于0.1％ FS/℃...