Mechanical Model on Brittle Crack Initiation and Propagation

A mechanical model is presented in this paper to describe the initiating and propagating of brittle cracks. Two criteria have been deduced from the model to determine the effects of such factors as local stress state, surface and grain boundary energies as well as local grain boundary orientation on the initiating and propagating of both intergranular and transgranular brittle cracks. By which the role of adding B in Ni3Al base alloys to improve their ductility,temper and hydrogen embrittlements in steels and other alloys as well as the random feature of brittle crack initiation could be explained     

银矿尾矿砂高强陶粒的研制

以广西凤凰银业有限公司的尾矿砂和废矿页岩为主要原料，在前期工作的基础上，经过实验室试验和生产线中试，成功生产出700～1000密度等级、筒压强度超过10MPa的高强陶粒。这为银矿的尾矿砂和废矿页岩的处理也为我国高强陶粒的生产探索了一条新路。     

对热量表流量传感器若干技术问题之初探

本文根据笔者对热量表流量传感器的研究体会,详尽分析了小口径机械式热水表作为热量表流量传感器时存在的主要问题,如量程问题,冷热水流量系数差异问题,降低始动流量和提高小流量情况下精度问题,磁传方式存在的磁干扰问题,失步问题,以及对我国供暖系统水质的适应性问题.文章根据研究和分析结果对上述问题提出一些初步解决方案与业内同行研讨,以期提高我国热量表的研制水平.     

工程项目安全检查表风险评价方法的制定与应用

依据有关安全健康与环境的法律法规、标准、规范、规程和其它要求，结合石化建设工程项目的特点，制定出了《石化建设工程项目安全检查袁风险评价方法》，经项目评价人员应用，找出了工程项目中存在的中、高风险危害，制定了对策，实施后取得了明显效果。     

Investigation on the Recrystallization Behaviour of Cold Deformed MP159 Alloy

The recrystallization behaviour of cold drawn MP159 alloy was investigated by optical and TEM examinations. It is found that the platelet ε phase in the MP alloy inhibits the recrystallization,and this effect makes the MP159 alloy with high recrystallization temperature of about 920℃.This inhibition mainly comes from the increasing of the interfacial energy, which results from the change of the coherent interfaces of (0001)hcp//(111)fcc into the incoherent interfaces when the recrystallizing grain fronts bypass the platelet ε martensite. The increasing of the interfacial energy also causes the dissolution of a few segments on the ε martensite platelets, which decreases the strength of the MP alloy     

太阳辐照绝对辐射计的精密温度控制系统设计

为了提高太阳辐照绝对辐射计(SIARs)的测量精度,消除温度变化对SIARs测量精度的影响,研究设计了精密温度控制系统,对SIARs进行恒温控制;通过对铂电阻温度传感器自热效应的弱化,提高了温度测量的精度;提出了一种新的复合PID控制算法,该复合控制算法使系统获得良好的动态和稳态性能;使用密闭的高低温箱来模拟星上温度条件对系统进行了实验测试,实验数据表明,系统控制精度在0.1℃以内,可为SIARs工作提供稳定的温度环境。     

Belief propagation algorithms for finding the probable configurations over factor graph models

In this article, we study the belief propagation algorithms for solving the multiple probable configurations (MPC) problem over graphical models. Based on the loopy max-product methodology, we first develop an iterative belief propagation mechanism (IBPM), which aims to find the most probable configurations facing with the existence of multiple solutions. In applications ranging from low-density parity-check codes to combinatorial optimization one would like to find not just the best configurations but rather than the summary of all possible explanations. Not only can this problem be solved by our proposed loopy message-passing algorithm (LMPA), we also prove that, for tree factor graph models, this LMPA guarantees fast convergence. Moveover, we subsequently present a low-complexity approach to simplifying the message integration operation throughout the whole belief propagation circulation. Simulations built on various settings demonstrate that both IBPM and LMPA can accurately and rapidly approximate the MPC in acyclic graph with hundreds of variables.     

瀑布沟水电站地下厂房系统岩爆规律分析

瀑布沟水电站地下厂房系统为大型地下室群,主要包括地下厂房、主变室、尾水闸门室;地下厂房系统属于高地应力区,围岩为澄江期中粗粒花岗岩,以Ⅱ、Ⅲ类围岩为主,完整性好;岩性坚硬,岩石饱和单轴抗压强度一般在100 MPa以上,地下水不丰富;岩石饱和单轴抗压强度Rb与最大主应力σ1比值在3.9~7.6间,根据《水利水电工程地质勘察规范》(GB50487-2008)岩爆分级及判别标准,厂房系统岩体可能发生中等~轻微岩爆。施工中对围岩采用打超前小导洞、控制爆破、掌子面喷水及钻孔注水、及时加固支护等处理后,有效地降低了围岩岩爆发生的强度和频率,保证了作业人员、设备安全,提高了施工进度。     

EMD滤波方法在NMR测井中的应用

核磁共振测井中,回波信号的信噪比对T2谱反演及后续地层解释评价过程有重要影响。基于核磁共振测井信号与噪声的分析,提出了一种采用自适应性较强的经验模态分解（ EMD）算法对核磁共振测井原始数据作消噪处理。结果表明,采用该滤波算法,实验室回波数据信噪比由22 dB提高到46 dB,标准油井回波数据信噪比由11 dB提高到31 dB,反演得到的T2分布更加精确,多次重复测量中孔隙度结果有较高的一致性。     

金属表面碳酸盐沉积层防腐机理研究

论述碳酸盐沉积层的自然形成过程,解释了碳酸盐层对金属表面的天然防护机理;提出利用碳酸盐层防腐的新概念,探索出了人为形成碳酸盐沉积层的技术路线。