超声检测混凝土硫酸盐侵蚀的研究

用超声波法对受硫酸盐侵蚀混凝土的表面损伤层厚度进行了检测，采用回归分析方法取代传统的作图法进行数据处理，并与受侵蚀混凝土的化学分析结果进行对比，标定超声检测混凝土腐蚀的程度和适用性，初步试验和研究表明，超声检测方法切实可行，可为混凝土耐久性无损检测工程提供参考。     

设备和管道保冷层厚度的计算--评暖通空调新规范及其他国家标准的有关规定

指出了《采暖通风与空气调节设计规范》GB50019--2003，国家标准图集《管道及设备保冷》98R419，《工业设备及管道绝热工程设计规范》GB50264—97，以及《设备及管道保冷设计导则》GB／T15586--1995，《设备及管道保冷技术通则》GB／T11790--1996等国家标准和国家标准图集，有关设备、管道保冷层厚度计算方法和厚度表中存在的问题，通过详细的计算和分析，说明了导致这些问题产生的原因，供讨论。     

水泥稳定碎石基层的施工质量控制

针对水泥稳定碎石基层的施工特点和裂缝现象，从影响其工程质量的压实度、平整度、厚度三个主要指标探讨了保证质量的控制方法，以保证基层施工质量，提高路面的使用率。     

全厚度车辙试验中对试件压实度的控制研究

分析了影响全厚度车辙试验结果的外因,从温度、压实功两方面对全厚度车辙试件各层的压实度进行控制。分析了压实度与动稳定度的关系等,这对完善全厚度车辙试验方法的技术要点、提高全厚度车辙试验结果的科学性有一定的参考意义。     

跨海公路隧道岩石覆盖厚度探讨

在特殊的地质环境条件下,建设海底隧道无疑是最安全经济、路线最短的方案。自从1936年第1条海底隧道--日本关门隧道开始建造以来,在世界各地,已有近百条海底隧道相继建设,海底隧道的设计与施工,还有许多技术问题丞待解决。结合我国拟建厦门海底隧道的工程实际,探讨了国内外海峡海底隧道工程的特点及其最小岩石覆盖层厚度的问题;结合世界上已建海底隧道的工程经验,应用经验类比法和数值分析法,研究厦门海底隧道的岩石覆盖厚度。研究成果将对我国未来的海峡海底隧道修建工程有所借鉴。     

爆破荷载作用下青岛胶州湾海底隧道覆盖岩层稳定性分析

以青岛胶州湾海底隧道为背景,采用国际上常用的计算模式模拟爆破施工荷载,根据ABAQUS动态计算的特点,将爆破荷载以等效应力的方式加载于模拟炮孔之上,依据不同围岩类型和岩层覆盖厚度设计值选取隧道左、右线典型段;采用有限单元法分析了覆盖岩层各监测点的振动速度、加速度变化趋势。数值分析结果表明,各测点的振动速度、加速度时程曲线均满足隧道爆破变形规律。根据隧道围岩振动破坏准则,计算所得的最大水平、垂直振动速度均小于规范要求的临界值,且爆破作用影响范围远小于隧道覆盖岩层设计厚度,所以岩层覆盖厚度设计值满足爆破工程稳定性和安全性要求。同时,考虑到隧道选线的经济合理性,提出了爆破施工荷载作用下隧道顶板厚度设计参考值,并进行了验证,对类似工程具有一定的指导意义。     

Measurement of the thickness of ice by means of a frequency-modulated radiometer

The operating principle of an ice thickness radiometer is considered, drawbacks of existing devices are noted, and an algorithm for processing the signals from a frequency-modulated distance finder reflected from the upper and lower surface of the ice is proposed. The algorithm was developed using a method of high spectral resolution. Results from computer simulation and from processing signals received from a test bench are presented. __________ Translated from Izmeritel’naya Tekhnika, No. 7, pp. 21–25, July, 2008.     

Tests and Numerical Simulation of Aerodynamic Characteristics of Airfoils for General Aviation Applications

本文采用不同的方法验证了相对厚度对机翼气动特性的影响。首先进行机翼风洞试验;然后用数值仿真的方法进行计算,进一步验证了数值方法能够有效的用来评价机翼的气动特性;还将试验结果用经验公式校核,证实了其有效性。这些方法得到的结果一致证实产生升力的因素不是单纯的相对厚度,而是迎角、翼型相对弯度以及中弧线。在迎角为零时,由于零升力主要由机翼中弧线决定,相对厚度对升力几乎没有影响。在此研究基础上,可以改变外界环境条件（如含尘大气或湿空气环境）,用数值仿真来评定不同环境中机翼的气动特性。     

Effects of Four Key Process Variables on Size Shrinkages of Low Temperature Co-Fired Ceramic Substrates

The effects of four key process variables on the size shrinkages of low temperature co-fired ceramic substrates were investigated using the methods of design of experiments (DOE), analysis of variance (ANOVA), and multivariable regression. The process variables investigated were raw tape thickness, laminating pressure, coining pressure, and coining time. The results revealed that coining pressure had the most significant effect on the size shrinkages of the low temperature co-fired ceramic samples under the process conditions set in this study. The average lateral size shrinkage and thickness shrinkage of the LTCC samples produced with a coining pressure of 320 MPa were significantly lower and higher than those produced with a coining pressure of 50 MPa with shrinkage differences of 3.6% and 6.2%, respectively. The effects of tape thickness, the interaction of tape thickness, laminating pressure, and coining pressure, the interaction of tape thickness and coining pressure, and the interaction of tape thickness and laminating pressure were also significant. Two regression equations were obtained and the shrinkage values could be estimated using them. The coefficients of determination R² were 99.9% and 98.9%, respectively, and the P values were smaller than 0.001 for the two regression equations. This can allow engineers to calculate the dimensions especially lateral dimensions and features such as pad pitches at the design stage and to set the process parameters at the manufacturing stage.     

Application of Adaptive Threading Technique to Hot Strip Mill

Thickness deviation of hot strip rolling needs to be strictly controlled in the computer system. An adaptive threading technique was researched, in which the measured data from threaded stands were used to predict thickness and material hardness errors, to modify the setup for the remaining unthreaded stands. After the adaptive threading model was used online on the hot strip mill of the Panzhihua Iron and Steel Group Co Ltd, the thickness deviation was decreased obviously. The hit rate of thickness control of different steel grades increases.