沉管法施工粒料桩加固地基应用与分析

文章对设计成桩工艺、质量控制、效果检验等，提出全面的分析判断，对今后应用该法进行软土地基加固，具有良好的借鉴意义。     

基于信息表的粒子计算研究

使用信息表可以开发简单、具体的粒子计算模型,粒子计算提供了用于问题解决和信息处理的通用方法.通过信息表描述决策逻辑语言及粒子计算,给出具体实例并进行分析.     

Characteristics of Pb~(2 ) biosorption with aerobic granular biomass

Experimental studies were conducted on the feasibility of aerobic granular biomass as a novel type of biosorbent for Pb2 removal. The results show that the initial pH, Pb2 concentration (C0) and biomass concentration (X0) affected the biosorption process significantly. Both the Freundlich and Langmuir isotherm models describe the biosorption process accurately, with correlation coefficients of 0.932 and 0.959 respectively. The Pb2 biosorption kinetics is interpreted as having two stages, with the second stage described reasonably well by a Lagergren pseudo-second order model. Moreover, the surface change of granular biomass after the Pb2 biosorption process appears to be caused by ion exchange and metal chelation according to the analysis results of Environmental Scanning Electron Microscopy (ESEM) and Energy Dispersive X-ray Spectroscopy (EDX).     

尿素-丙酰胺二元固-液相图的研究

本文采用热分析法对尿素一丙酰胺二元固-液共存体系进行研究,建立了尿素-丙酰胺二元固-液体系相图;并计算出两个纯组分的熔点、标准摩尔熔化热及其凝固点降低常数等量．     

粒间摩擦和层厚比对二维分层颗粒系统底部响应的影响

研究分层颗粒中的力学响应对于理解复杂颗粒系统的弹性与变形的机理具有重要意义.基于离散单元法,针对粒间摩擦和层厚比对系统中力学响应的影响,建立上软下硬和上硬下软两种规则排列的二维分层颗粒系统模型,并进行仿真分析.结果表明:在上软下硬型系统中,随摩擦系数的增大,底部响应均是按照双峰→平台→单峰的顺序演变,平均力、峰值、中间...     

离散态物质内部的非稳行为及其规律

用实验方法研究了在离散态颗粒物质中以不同速度向上提拉探测杆时,杆受到的滑动摩擦力.实验结果表明,滑动摩擦力F随测量时间t成非线性上升然后下降.对F进行功率谱分析的结果表明:功率S(f)与频率f存在幂函数的关系,即S(f)∝fβ,-2.0≤β≤-1.0.这现象利用自组织临界模型得到了很好解释.     

浅圆仓散料侧压力计算方法研究

大直径浅圆仓贮料顶面一般为锥面,这种情况下的侧压力计算和上部贮料产生的超压问题非常重要．针对这一问题提出2种计算方法．其中一种是将极限平衡思想直接应用于浅圆仓,得到适合于浅圆仓本身的散料侧压力计算方法;另一种是考虑直线挡墙和浅圆仓情况下,两种散料滑动楔体的形状差别,用二者的体积比来修正Coulomb公式,从而得到适合于浅圆仓散料侧压力的近似计算方法．依据仓内散料顶面的堆放方式及其破裂面可能方位等因素,考虑两种工况．每种工况选择适合于自身的一种较简单的计算方法．经实仓试验验证了方法的实用性．     

热型连铸Al-Cu合金的组织与性能

在热型连铸设备上制取了 Al- 1 0 %Cu合金的线材 ,对线材的组织与室温拉伸性能进行了实验分析 ,发现该工艺可显著提高材料的轴向性能 ,认为这是硬脆的α-Al+ Cu Al2 共晶体在材料中沿轴向分布的结果 .     

Magnetic properties and tunneling magnetoresistance in FeCo-SiO2 granular films

Fefv(SiO2)1-fv granular films were fabricated by rf sputtering (fv represents the Fe volume fraction). The mi-crostructure, magnetic properties as well as the tunneling magnetoresistance effect (TMR) were systematically studied. It was found that the maximum TMR ratio is about -3.3% at fv = 0.33. Under the same condition, a series of (Fe100-x Cox)0.33(SiO2)0.67 were prepared. TMR value reaches -4.5% at x = 53, while the microstructure of the film still keeps as that of Fe0.33(SiO2)0.67. The higher TMR ratio is contributed to the elevating of the spin polarization of particles. This is consistent with Inoue's theory.     

喷粉处理改善孕育效果的试验研究

喷粉孕育是将粉粒状孕育剂以氮气为载体喷入铁水的一种新型工艺方法．本文采用自制的喷粉装置进行了喷粉孕育的试验研究．结果表明：喷粉处理可改善孕育效果，改善石墨形态，明显地细化共晶团，有效地消除白口倾向，从而提高铸铁的强度．喷粉孕育成为一种极有效的孕育技术．