联合泡沫混凝土与EPS处理软基模拟研究

简要介绍并对比了泡沫混凝土与EPS材料的基本特性,为进一步减轻路堤对原路基的附加应力,提出联合应用泡沫混凝土与EPS材料处理软基的新方法,并借以规划中的中开高速所得勘察数据为依托,采用理论计算与Midas GTS NX数值模拟计算得出结果并对比分析。     

Multiphase microstructure and property of low carbon bainite/ferrite steel by quenching and carbon partitioning

The multiphase microstructure and properties of low carbon steel by IQ&PB process under different partitioning temperatures and time were studied by means of SEM, EPMA, XRD and tensile testing. Results show that the microstructures of experimental steel consist of ferrite, bainite and retained austenite. With the increase of the holding time in two- phase region, the C and Mn contents apparently increase in martensite which transformed from austenite, and C and Mn content are 1. 47 times and 1. 16 times than average value of the base. With the decrease of the quenching and partitioning temperature, the volume fraction of the bainite increases, the microstructure is refined, and the content of M/A islands increases. With the temperature and time increased, the volume fraction of retained austenite at room temperature increases, the tensile strength decreases, the total elongation increases, and work hardening behavior occurrs continuously. When the partitioning time is 30min and the partitioning temperature is 400??, the tensile strength of the steel is 1107MPa, the elongation is 24%, the product of strength and elongation reaches above 26568MPa??%.     

A Remark to a Formula in K. Ishimatsu's Paper on “Continuous γ-ray Spectrometry with Scintillation Counters”

Spatial distribution of the Cd-ratio of Au foils were measured for various lattice pitches in a natural uranium-light water system. Comparison of the experimental results with theoretical calculation using the THERMOS-code shows some divergence of the theoretical Cd-ratio toward larger than experimental values in the fuel rod.     

基于局部模糊逻辑系统合成的一类非线性不确定系统自适应控制

通过使用从属于系统状态区域上开覆盖的单位分解,首先将若干个局部生成的模糊逻辑系统合成而产生一种函数逼近器,与通常的模糊逻辑系统相比较,这种逼近器不仅具有万能逼近性质,而且由于局部模糊逻辑系统具有较少规则而能够保持语言可解释性；然后,通过将适当的参数植入这种函数逼近器中,能够为某些非线性不确定系统设计自适应镇定控制器；最后,通过仿真例子验证了所提出方法的有效性.     

On application of input data partitioning to Bayesian weighted averaging of biomedical signals

Averaging in the time domain may be used for noise attenuation in case of biomedical signals with a quasi‐cyclical character. Traditional arithmetic averaging technique assumes the constancy of the noise power cycle‐wise, however, most types of noise are not stationary and the variability of noise power is observed. It constitutes a motivation for using methods of weighted averaging, in particular Bayesian weighted averaging. This paper presents the computational study of Bayesian weighted averaging with traditional (sharp) and fuzzy partition of the input data in the presence of non‐stationary noise. There is presented the known empirical Bayesian weighted averaging method (EBWA), with the parameter p describing the probabilistic model, and its modification NBWA which eliminates the parameter. Both methods can be extended by partitioning of the input data. The performance of presented methods is experimentally evaluated for an analytical signal as well as a real ECG signal and compared with traditional arithmetic averaging method. However, the methods can be applied to any signal with a quasi‐cyclical character. The aim of the paper is to show the influence of the type of partition as well as the number of parts on the quality of the averaged signal.     

Partitioning of PCBs from air to clothing materials in a Danish apartment

Polychlorinated biphenyl (PCB) contamination of buildings continues to pose an exposure threat, even decades after their application in the form of calks and other building materials. In this research, we investigate the ability of clothing to sorb PCBs from contaminated air and thereby influence exposure. The equilibrium concentration of PCB‐28 and PCB‐52 was quantified for nine used clothing fabrics exposed for 56 days to air in a Danish apartment contaminated with PCBs. Fabric materials included pure materials such as cotton and polyester, or blends of polyester, cotton, viscose/rayon, and/or elastane. Air concentrations were fairly stable over the experimental period, with PCB‐28 ranging from 350 to 430 ng/m³ and PCB‐52 ranging from 460 to 550 ng/m³. Mass accumulated in fabric ranged from below detection limits to 4.5 mg/g of fabric. Cotton or materials containing elastane sorbed more than polyester materials on a mass basis. Mass‐normalized partition coefficients above detection limits ranged from 10^5.7 to 10^7.0 L/kg. Clothing acts as a reservoir for PCBs that extends dermal exposure, even when outside or in uncontaminated buildings.     

HPLC法研究4种磺酰脲类降糖药的油水分配系数

本试验采用HPLC法测定4种磺酰脲类降糖药的油水分配系数,并且采用π加和法计算理论值,比较其试验值、理论计算值和文献值,结果基本一致。简要分析油水分配系数与药物结构的关系,与药代动力学的关系。为其剂型的设计、处方工艺的改进及临床合理用药提供参考。     

风冷冷水机组冷凝部分的设计及探讨

风冷冷凝部分是风冷冷水机组的重要组成部分,因此在设计中要加以重视。着重对风冷冷水机组冷凝部分的常规结构进行了阐述和分析,并针对性地提出了一些新的设计思路以解决实际应用中经常遇到的一些难题,希望对相关设计人员有一定的参考与借鉴意义。     

Thermodynamic Analysis of Desulfurization and Its Connection With Deoxidation and Temperature for SPHC in JISC During LF Refining Process

The thermodynamic characteristics of desulfurization reaction (CaO)+[S]=(CaS)+[O] is analyzed based on the detailed composition of liquid steel and slag of Steel Plate Hot Commercial (SPHC) in Jiuquan Iron & Steel Corporation(JISC), where the activities of CaO, CaS and Al2O3 in molten slag are calculated by thermodynamic software FactSage for a more accurate result. The critical values of [O%]/[S%] for desulfurization at different temperature is are obtained, typically 0.09 at 1873K, which shows directly that it should deoxidize adequately for obtaining a favorable desulfurization condition. In addition, the thermodynamic analysis indicates that the actual dissolved O is much higher than that of equilibrium calculation which shows Al-O reaction in LF is far away from equilibrium, but it is perfect agreement with the computing results when taking the activity of Al2O3 as 1 that due to the inclusion component in LF is mainly Al2O3. Besides, with the temperature rise, the sulfur partition ratio increases softly meanwhile the reaction between Al and O is limited to a great degree resulting in the increase a dissolved oxygen in liquid steel that decreases the sulfur partition ratio seriously. As a result, the sulfur partition ratio appears to decrease with temperature increase in Al killed steel.     

浅析楼板重质撞击测试及其相关标准

轻质撞击相对于重质撞击来说在国内以及国际上是最常见的测试方法,国内、国际都已颁布正式测试标准.对于重质撞击测试,目前只有韩国、日本以及中国台湾地区有相应的测试标准.随着人们对住宅声环境的要求越来越高,现在仅用轻质撞击法来评价楼板撞击声的隔声性能已不能满足需求,着重于对重质撞击测试进行浅显的解析.