在湿陷性黄土场地试坑浸水试验的深层沉降监测中,传统的深标点法仅能单孔单点测量、电磁式沉降仪法存在测量误差大等不足.为此,研制了一种拉线式深层沉降监测新装置.该新装置的基本原理是在监测点处开挖竖直探井,沿探井圆周均匀设置多个深层测点,将锚固头安装至测点处的探井侧壁上,当测点处土层发生湿陷变形时,首先由锚固头将变形传递给测绳,然后再由测绳传递至立柱上的滑块,最后通过量测立柱上的固定支座与滑块之间的相对位移,结合几何水准测量结果,得到各测点的深层沉降量.新装置与传统深标点法的现场对比试验结果表明,新装置具有原理清晰、结构简单、量程可调、精度高等优点,既满足了单孔多点测量需求,又提高了测量结果可靠性.最后对该新装置尚存在的问题进行了探讨,并提出了改进建议.

通过一系列地质调查研究了黄土湿陷地裂缝的发育特征,结合浸水试验分析了地裂缝的成因机理和形成过程.研究结果表明:黄土湿陷地裂缝与浸水坑平行,兼具水平拉张和竖直位错,地裂缝发展演化过程可分为四个阶段.黄土湿陷地裂缝上宽下窄,其宽度和竖直位移均随深度增加而减小,地裂缝发育深度约等于黄土湿陷土层厚度.黄土渗透浸润线与竖直面的夹角随时间逐渐增加,导致湿陷地裂缝逐渐向外扩展.黄土湿陷产生的差异沉降和拉张应变是湿陷地裂缝形成的直接因素,当地面倾斜率达到0.6％,拉应变达到0.002％时,地裂缝出露地表.基于悬臂梁理论提出了湿陷差异沉降产生拉张应力的计算公式,根据本公式可预测黄土湿陷地裂缝的发育位置.

Using a current target and a semi-circle loop antenna,the radiated electromagnetic fields are detected and recorded at constant air gap distance.The distribution and characteristics of air electrostatic discharge（ESD） is investigated based on the radiated electromagnetic fields attentioned before.A new concept classifying air ESD areas is proposed.The air ESD can be classified into such four discharge gap areas as rising area,falling area,flatness area and zero discharge area.The distribution of the discharge gap area is more distinctive under the higher discharge voltages.The discharge at a certain discharge gap area corresponds to the discharge at a certain approaching speed of electrode.

Based on the working principle,fault model and maintaining tactics,this paper introduces the possible fault model and the maintaining decision in the middle repair for the warning to-air ship-load radar launching system with the maintaining course,fault model on system insulating degree,which offers the reference and technical support for the same level maintenance of the same type radar.

Building general software platform of ATS,realizing transplantation of TPS and interchangeability of instrument are a direction for general ATS.The paper elaborates the theory of interchangeability for ATS.By discussing several software standards of typical ATS,the paper illustrates characteristics of several software standards in detail,studies the theories of interchangeability technology for ATS building on several software standards.By giving a comparison among interchangeability technology in this paper,we can know test technology of signal-oriented may really realize transplantation of TPS and interchangeability of instrument,and it will be a direction for ATS in future.