The effects of capillary force in micro or nano-indentation

Models describing wet adhesion between indenters and substrates joined by liquid bridges are investigated. The influences of indenter shapes and various parameters of structures on capillary force are focused. In the former, we consider several shapes, such as conical, spherical and truncated conical indenter with a spherical end. In the latter, the effects of the contact angle, the environmental humidity, the gap between the indenter and the substrate, etc. are included. Different dependences of the capillary force on the indenter shapes and the geometric parameters are observed. Most interesting finding is that applying the present results to micro- and nano-indentation experiments shows the size effect in indentation hardness not produced but underestimated by the effects of capillary force.(4 refs)

利用吸收光谱方法诊断超燃直联台燃烧效率

燃烧效率是超声速燃烧优劣的直接评价，一直是超燃实验研究的测量难点。本文发展了基于可调谐二极管激光器吸收光谱技术(TDLAS)的燃烧效率测量方法。利用3条水蒸气吸收谱线(7168.437cm-1,7185.597cm-1和6807.834cm-1)，在4kHz的测量频率下，采用分时扫描-直接探测的策略测量了以氢气为燃料的超燃直联台燃烧室入口的气体参数，并利用位移机构扫描测量捕捉了燃烧室后段某垂直截面的温度、水蒸气浓度分布和截面的平均气流速度。分别根据水蒸气浓度和总温分布计算得到燃烧效率。

整合素-ICAM-1相互作用的二维反应动力学研究

<正>_2整合素(LFA-1和Mac-1)与其配体细胞间粘附分子-1(ICAM-1)的相互作用在诸如肿瘤转移、炎症反应等许多病理生理过程中起着重要的作用。研究表明,中性粒细胞(PMN)在特定环境下可通过_2整合素与ICAM-1的相互作用而增强黑色素瘤细胞的转移能力,但是其动力学调控机制还不清楚。受体-配体键结合和解离的二维反应动力学定量描述了分子结合的快慢和强弱,是回答_2整合素与ICAM-1相互作用如何调