基于抗裂的沥青路面合理结构研究

利用专门的道路设计程序,对半刚性基层沥青路面进行结构力学计算。通过沥青路面内的应力大小和分布分析,得到层底拉应力随结构力学参数(各材料层厚度、模量及结构形式)变化规律,据此提出避免沥青面层疲劳开裂和半刚性基层反射裂缝的沥青路面合理结构,并指出基于抗裂的沥青路面材料组合设计方向。研究结果对半刚性基层沥青路面结构组合设计具有理论参考价值。     

DEXA-assessed regional body composition changes in young female military soldiers following 12-weeks of periodised training

Dual-energy X-ray absorptiometry (DEXA) was used to assess whole body and regional soft tissue mass, fat mass and lean body mass compositional changes in 68 female recruits (age 20.8 ± 1.14 years; body mass 59.5 ± 8.79 kg; stature 159.57 ± 5.53 cm) pre- and post 12-weeks of military basic training. A decrease in total body fat tissue mass (10.2%) and regional percent fat (10.9%) was measured with an increase in total lean body mass (8.7%). Of interest were the differences in the responses in the tissue composition of the arms (16.2% loss in fat mass with an 11.6% gain in lean mass), trunk (17.0% decrease in fat mass with a 10.4% increase in lean mass) and the legs (10.5% increase in lean mass but no change in fat mass). These findings show the importance of considering regional rather than whole body composition changes when assessing the effects of a training programme.

Statement of Relevance: Female soldiers experienced a change in total body fat tissue (?10.2%) and lean body mass (+8.7%) after basic training; however, no significant fat mass decrease was evident in the leg region. Regional rather than whole body composition changes need to be considered when assessing the effects of a training programme.     

YUV空间的彩色图像HDR合成算法

RGB空间的高动态范围(HDR)彩色图像合成算法存在颜色失真和计算耗时的问题。为此,提出一种YUV空间的彩色图像HDR合成算法。利用多幅不同曝光度的普通数字图像,通过计算机高速运算对彩色图像进行HDR合成。实验结果表明,该算法的合成图像质量较高、计算速度较快。     

成分分析仪在硫磺回收装置上的选用

针对硫磺回收工艺气的成分分析要求．结合某炼油厂硫回收装置中成分分析仪的选用与配置，个绍了两种成分分析仪的工作原理及特点．以及在硫磺回收装置中的选用与分析控制方案。     

Thermomechanical behavior of Ti-Ni shape memory alloy films deposited by DC magnetron sputtering

In this study, thermomechanical properties of titanium-nickel (Ti-Ni) shape memory alloy (SMA) films are investigated in order to derive constitutive relations. Ti-Ni SMA films, deposited by DC magnetron sputtering under controlled film composition, are characterized by uniaxial tensile tests. At room temperature (R.T.), Ti-Ni films having Ti contents less than 50 at% exhibit superelastic behavior, and those having Ti contents greater than 50 at% exhibit shape memory behavior. However, the Ni—53.2 at% Ti film fractured at a tensile strain of 0.8% because of an increase in brittleness with increasing Ti content. At elevated temperatures, Ti-Ni films having Ti contents of 50.2 to 52.6 at% undergo phase change from martensite to austenite. The Young's modulus of the Ti-Ni films depends on temperature at each phase, regardless of film composition. Film composition does, however, affect the measured material constants b_A, b_M, c_A, and c_M. Stress-strain curves calculated from the constructed constitutive equation closely agree with those obtained from tensile tests, for both the martensite and austenite phases. The constitutive equations are expected to find great utility in the design of Ti-Ni film-actuated microelectromechanical systems (MEMS).     

变压器型式试验的样品组成和样品数量的确定(上)

研究和讨论了GB 19212.1-2003,5.2和附录B分别规定的单规格变压器的试验规则和"系列变压器的试验"规则,提出了确定变压器型式试验的样品组成和样品数量的一种可操作的方案.     

GH3030合金电渣重熔Al、Ti成分控制分析

对GH3030合金电渣重熔成Ф50mm钢锭，第1批试制生产电渣锭烧Ti增Al的主要原因进行了分析讨论，得出：在电渣重熔初期，渣中TiO2含量很低，而AlO3含量很高，为保持平衡常数KT为一定值，化学反应：3[Ti]＋2（AlO3）□4[Al]＋3（TiO2）向右进行，在钢锭下部[Ti]把渣中（AlO3）的（Al^3＋）还原成[Al]而进入钢中，使钢锭大头端Al成分不合格，为此采取向渣中加入一定量的TiO2粉，能使钢锭Al、Ti成分得到有效控制。     

20000m~3/h空分设备DCS控制系统的设计与应用

简述Industrial-ITAC800FDCS控制系统在济钢3#20000m3/h空分设备上的应用情况,介绍该系统的硬件和软件配置及其实现功能、特点。     

MEH-PPV薄膜及其与金属喹啉配合物共混薄膜光伏特性的研究

研究了电子聚合物MEH PPV及其与金属喹啉配合物BAlq共混薄膜的光伏特性。测试结果表明:(1)共混膜中MEH PPV与BAlq发生了纳米级的相分离并形成互相渗透的结构,十分有利于光生激子离解为空穴和电子的过程及载流子在薄膜内的输运;(2)共混后的聚合物光伏器件的短路电流比共混前提高了200余倍。     

GMZ快速关断逆止阀用于轴流风机的联锁控制

叙述了GMZ快速关断逆止阀的组成及工作原理和优点。将它用于轴流风机的联锁控制,可为轴流风机的安全运行提供保证。