A novel approach for fit analysis of thermal protective clothing using three-dimensional body scanning

The garment fit played an important role in protective performance, comfort and mobility. The purpose of this study is to quantify the air gap to quantitatively characterize a three-dimensional (3-D) garment fit using a 3-D body scanning technique. A method for processing of scanned data was developed to investigate the air gap size and distribution between the clothing and human body. The mesh model formed from nude and clothed body was aligned, superimposed and sectioned using Rapidform software. The air gap size and distribution over the body surface were analyzed. The total air volume was also calculated. The effects of fabric properties and garment size on air gap distribution were explored. The results indicated that average air gap of the fit clothing was around 25–30 mm and the overall air gap distribution was similar. The air gap was unevenly distributed over the body and it was strongly associated with the body parts, fabric properties and garment size. The research will help understand the overall clothing fit and its association with protection, thermal and movement comfort, and provide guidelines for clothing engineers to improve thermal performance and reduce physiological burden.     

基于机器人三维模拟仿真的焊接生产线柔性主拼技术研究

为满足生产线柔性设计需求, 对柔性焊接生产线解决方案的难点进行了分析, 提出了基于机器人三维模拟仿真的生产线柔性主拼技术方案, 建立了机器人负载边界模型和基于负载边界模型的机器人选型及快换装置选型方案, 提出了网格式夹具设计方法, 以白车身柔性焊装生产线为例, 建立了面向柔性的网格式夹具设计方案以及网格式装配检测及应力分析, 并对面向柔性主拼中的离线编程技术及三维仿真中的项目权限管理和工作站模拟仿真工作流程进行了分析。该方案在某汽车厂NL-1&NL-2两个车型项目生产线的设计中应用焊接生产线上进行了应用验证, 能满足两车型生产线柔性主拼的需求。     

无线体域网技术研究现状与展望

无线体域网(WBAN)技术是当前重要的研究热点,可以应用于医院内患者实时监测和家庭健康护理领域,具有广泛的应用前景和巨大的市场潜力。WBAN对设备的可穿戴性和数据传输的可靠性、安全性提出了更高的要求,技术发展中存在一些需要深入研究和解决的问题。对WBAN关键技术的研究现状和产业化进展进行了综述,并对WBAN技术的未来研究和发展前景进行了展望。     

四种金属离子亲和层析纯化重组戊型肝炎病毒包涵体的效果比较

目的 选择固相金属亲和层析柱的金属离子,以优化分离纯化重组戊型肝炎病毒包涵体的条件。方法 在同一试验条件下用4种金属离子柱分离纯化目的蛋白。结果 包涵体经不同离子柱层析时目的蛋白的收获率、纯度、洗脱条件各异。结论 镍离子柱纯化效果最佳。     

型腔体组件装配尺寸检测技术分析与运用

为解决型腔体组件装配尺寸的检测问题,以某枪型的型腔体组件为例,分析该型腔体组件的结构特点,设计组合型检测装置,实现准确检测目的.归纳总结了型腔体组件装配尺寸检测技术运用过程中检测装置的设计要领,采用设计与被测型腔体组件相匹配的组合型检测装置,有效解决了型腔体组件装配尺寸检测过程中的定位困难、操作繁琐、检测准确性差等问题.该检测技术对确保型腔体组件装配尺寸的检测稳定性、检测可操作性、检测准确性等方面具有现实的指导意义.     

校车车身结构的有限元分析

建立某型校车的有限元模型,计算在不同工况下其车身骨架的静态强度.计算结果表明:在弯曲和扭转工况下,该校车最大应力分别为154.8和171.4 MPa,均小于Q235屈服应力235 MPa;最大变形分别为4.925和12.92 mm,满足《客车定型试验规程(GB/T 13043—2006)》中所规定的弯曲和扭转工况下10及12 mm的限额;车身结构整体应力大多集中在30 MPa左右,有较大的安全裕度.分析结果可为该校车车身骨架结构优化提供参考.     

Gas-Chromatographic Analyses of the Subcaudal Gland Secretion of the European Badger (Meles meles) Part I: Chemical Differences Related to Individual Parameters

In many species, chemical signals are important in the context of intraspecific communication. European badgers (Meles meles) use the secretion of their subcaudal gland to mark both the environment and conspecifics. In this paper, we investigated the chemical composition of subcaudal gland secretions and how it varies among individuals according to group membership, season, sex, age, body condition, and reproductive status. We analyzed 66 samples by gas chromatography using a mass-spectrometer as detector. We found 110 different components, of which 21 were present in every profile. The chemical composition of the secretions proved to be highly individual-specific, but no single peak was found to be typical for one of the investigated categories (season, sex, etc.). Analyses of the relative area (% area) that every peak contributed to the overall profile area showed that, in general, group members have more similar profiles than do badgers from different groups. Composition varied over seasons and between sexes and was influenced by age, body condition, and reproductive status. We, therefore, conclude that the secretion not only encodes group membership and individuality as previously assumed, but might also convey information about fitness-related parameters.     

从包涵体中纯化重组人幽门螺杆菌尿素酶B亚单位

目的 建立一种有效的方法，从包涵体中纯化重组人幽门螺杆菌尿素酶B亚单位（rUreB）。方法重组大肠杆菌发酵后，表达的rUreB包涵体经洗涤、变性、复性，采用Q Sepharose Performance阴离子交换层析和Pheny1 Sepharose High Performance疏水层析分离纯化。使用 SDS－PAGE和HPLC检测纯度，选用 ELISA和 Western－bloning对纯化蛋白的生物学活性进行鉴定。结果 rUreB包涵体经洗涤和溶解后，rUreB的纯度＞70％。包涵体溶解液经阴离子交换层析和疏水层析后纯度超过95％。rUreB纯品具有良好的生物学活性。结论 建立了从包涵体中获得高纯度的rUreB的工艺，为进一步的研究打下了基础。     

骨质瓷生产经验浅谈

从骨质瓷的生产实际出发，并结合作者的生产经验概述了骨质瓷生产工艺中应着重了解和解决的问题。     

基于DEM的碎屑流运动特性数值模拟

采用颗粒离散元法建立了碎屑流三维数值模型,分别从整体和局部对碎屑流运动特性进行深入分析。结果表明:碎屑流的运动过程可分为启动加速、高速滑动和减速堆积3个阶段;边坡底面平整时,堆积体中大颗粒堆积在表面,而细小颗粒位于中下部位;碎屑流运动速度和能量损失受颗粒间的接触碰撞影响大;碎屑流不同部位运动速度最大值相同,达到速度峰值的时间与颗粒的初始水平位置有关,与深度无关;堆积体分区明显,堆积体中的颗粒按初始水平位置依次排布;坡脚位置堆积深度最大,往两侧逐渐减小;碎屑流在运动初期和末期横向运动明显,扩大了灾害影响范围。