Studies on the Oxidation of Weathered Coal with Nitric Acid

A raseach has been done on the possibility of producing nitriochumic acid fromweathered coal of Nantong,Sichuan,oxidised by nithic acid.The optimun reacting conditions,whichare found through the way of orthogonal experiment,are suggested as follows:concentration ofHON3 35%,rate of HON3 to coal 3.5,reacting take 15 min,and reaction temperature 369 K. Thecomposition of product is Wf 2. 91 %;Ag 14.06%;HAg 78.28%;Ng 1.62%.     

THE SIZE EFFECT OF THE FRACTURE ENERGY OF CONCRETE TESTED BY THREE POINT BENDING

This paper ainalyses the size effect of the fracture energy of concrete tested bythree point bending. It is shown that positive errors of test results of fracture energy increase,ornegative errors decrease with increasing of the specimen ize. The phenomenon is one of main causesresulting in the size effect of fracture energy.     

The Inherent Fault Tolerance of Multi-Layer Neural Networks

The inherent fault tolerance of multilayer neural networks (MLNs) is due to thedistributed properties of information processing and information storage in an MLN , and the inher-ent fault-masking capability of every neuron. Also,the concept of inherent fault tolerance of MLNsis formalized, Finally, perceptrons and three-layer nets are shown inherently fault tolerant underreasonable statistical conditions,respectively.     

Vector form intrinsic finite element analysis based on fine beam model

精细梁不同于Euler梁和Timoshenko梁,该模型在考虑剪切变形的同时还考虑了横向弯曲时截面转动产生的附加轴向位移及横向剪切变形影响截面抗弯刚度后产生的附加横向位移。推导了适用于向量式有限元分析的精细梁单元应变和内力表达式,采用FORTRAN自编了向量式有限元程序。对悬臂梁、两端固支梁和门式框架进行了算例分析,对比了采用不同梁单元模型下结构的竖向位移。结果表明：当高跨比较小时,3种梁单元的竖向位移相差不大;当高跨比较大时,精细梁单元的竖向位移较Euler梁和Timoshenko梁明显增大,表明剪切变形及刚度折减引起的附加轴向位移、附加横向位移不能忽略。精细梁单元模型对高跨比较大的梁进行分析可望得到更精确的结果。     

Fire resistance performance on restrained high strength Q460 steel beams

为了研究约束高强度Q460钢梁的抗火性能,在已有约束钢梁分析理论的基础上,引入残余应力,提出了约束钢梁的抗火性能分析方法,并采用普通强度约束钢梁试验数据对分析方法进行了验证。考虑高强度Q460钢材高温下力学性能参数,利用所提出的方法分析了约束高强度Q460钢梁的抗火性能,并与普通强度Q345钢梁进行了对比。对影响约束高强度Q460钢梁的抗火性能参数进行了分析,包括荷载比、残余应力、轴向约束刚度、转动约束刚度和受火方式等。研究表明：所提出的分析方法准确可靠,高强度Q460钢梁抗火性能与普通强度钢梁具有较大的区别,高强度Q460约束钢梁的抗火性能明显优于普通强度约束钢梁。荷载比、轴向约束刚度、转动约束刚度、受火方式对高强度Q460约束钢梁有较大影响。     

基于单台强震数据软厚场地地震反应不确定性分析

选取新西兰Canterbury地区12个强震台站及2010—2012年间的台站584条记录,以浅硬场地LPCC作为参考台站,系统分析Christchurch市区软厚场地地震效应(即场地放大函数)的不确定性及地震动强度、震级、震源距及震源方位角等因素对场地放大函数不确定性的影响规律。分析结果发现：1)地震动强度水平对场地放大函数均值影响较小,仅在长周期(如大于1.0 s)段趋于增大场地的放大效应;以不同地震动强度值进行分组,地震动强度大于0.6 m/s 2的分组场地放大函数标准差显著高于地震动强度小于0.6 m/s 2分组,特别是地震动强度大于1.0 m/s 2时场地放大函数标准差最大,反映了场地土层非线性提高场地地震效应的不确定性;2)地震震级对场地放大函数不确定性影响小,不同地震震级分组场地放大函数均值及标准差的表现基本相当;3)震源距是场地地震反应不确定性的一个重要因素,震源距小于5 km时场地放大函数的标准差明显大于其它情况,即震源距越小地震反应不确定性越大;4)场地放大函数不确定性与震源方位角的选取基本无关,即选取不同的震源方位角场地放大函数标准差无明显差别。     

板蓝根高产优质栽培及采种技术

根据板蓝根的生物学特性和多年的栽培实践,总结出板蓝根高产、优质栽培及采种的技术措施,对板蓝根大面积高产、优质栽培及采种具有一定的指导意义.     

Exploration of the Sustainability Design for Industrial Building

Within the domain of comprehensive architecture, the general instructive principles for the sustainability design are applicable to that of industrial building. Based on the analysis of excellent precedents, in this paper, some useful experiences are summarized. It is pointed out that the sustainability design is feasible and should be compulsive for industrial building.     

Study on Mechanism of the Reinforcing Effect of Geogrid in Soil Dam

An experimental study on consolidation and drainage of two gravels with different grading was carried out using high - pressure large - scale tri - axial testing facility. A concept of equivalent surrounding pressure is introduced. An analysis was carried out on the effect and mechanism of reinforcement, experimental surrounding pressure and soil properties. Results show that the reinforcement can improve the strength and failure strain of the material and delay the failure of the soil. The effect of reinforcement of soil - gravel depends on the surrounding pressure and weathering of the gravel.