松花江水环境质量评价模糊可变集合工程方法

为对松花江哈尔滨江段的水质进行科学准确的评价,首先证明该江段水环境质量评价物元分析法关联函数基本公式的错误,然后在工程可变模糊集理论的基础上,提出以相对差异函数表示的模糊可变集合工程方法,对该江段水环境质量进行评价.通过实例,将结果与物元分析法进行比较,验证模型与方法的合理性.同时分析物元分析法对松花江哈尔滨江段的水质评价成果的逻辑错误,指出物元分析法不能用于水环境质量评价等领域.     

油气藏相渗特征参数的非线性参数识别

复杂多相流体体系相渗特征曲线是认识多相流体在多孔介质中的渗流机理和进行数值模拟及油气藏开采动态预测的基础.利用非稳定法实验原理,采用室内实验获取非稳定驱替过程的压力历史和各相的生产资料,根据非线性参数识别技术,通过LMF算法和最优控制算法来实现相对渗透率特征参数变化步长的自动调节,使模拟压力拟合非稳定流实验的压力历史数据,解决了复杂多相流体渗流相渗特征参数的识别问题,由此获得的相对渗透率曲线不但快速、饱和度范围宽、曲线形态好,而且消除了常规方法假设条件带来的结果误差.非线性参数识别结果和试验结果具有较好的一致性,证明了方法的可靠性.     

Numerical analysis on Joule heating of double-loop channel induction furnaces

In order to investigate Joule heating power, a three-dimensional finite element model (FEM) was developed to predict Joule heating power in the channels of double-loop inductor. The simulated results were compared with experimental data from low load trials for a 400 kW inductor. The results, such as power factor and Joule heating power, show reasonable correlation with experimental data, and Joule heating rate reaches the maximum at the corners and the minimum at the centre of the cross-section area. With increasing relative permeability of iron core, length of coils, current frequency and resistivity of metal melt, the power factor and Joule heating power change. It is concluded that current frequency, the resistivity and length of the coil play a critical role in determining the power factor and Joule heating power, whereas relative permeability of the magnetic core shows no significant influence on them.     

Deformation characteristics of surrounding rock of broken and soft rock roadway

A similar material model and a numerical simulation were constructed and are described herein. The deformation and failure of surrounding rock of broken and soft roadway are studied by using these models. The deformation of the roof and floor, the relative deformation of the two sides and the deformation of the deep surrounding rock are predicted using the model. Measurements in a working mine are compared to the results of the models. The results show that the surrounding rock shows clear rheological features under high stress conditions. Deformation is unequally distributed across the whole section. The surrounding rock exhibited three deformation stages: displacement caused by stress concentration, rheological displacement after the digging effects had stabilized and displacement caused by supporting pressure of the roadway. Floor heave was serious, accounting for 65% of the total deformation of the roof and floor. Floor heave is the main reason for failure of the surrounding rock. The reasons for deformation of the surrounding rock are discussed based on the similar material and numerical simulations.     

普通混凝土抗冻耐久性研究

以水灰比为0.60,0.55,0.50,0.45和0.40的普通混凝土抗冻耐久性为研究内容,用混凝土相对动弹性模量和质量损失率来表征冻融过程中性能劣化状况.通过试验得出：随着冻融循环次数的增加,相对动弹性模量基本上呈直线变化,而质量损失率在循环初期,随水灰比不同,呈不同变化趋势,后期质量都减小.     

碳纤维混凝土在动态称重中的应用

目的 在弹性阶段对碳纤维混凝土(CFRC)条块试件施加荷载,得出荷载与相对电阻率变化率之间的关系.方法 通过改变加载位置、加载频率、加栽范围,测定荷载与试件电压之间的相互关系.计算得出相对电阻率变化率与电压之间的相互关系.通过曲线拟合,得出的曲线斜率反映压敏性的大小.结果 得出了条块的相对电阻率变化率与荷载的关系,相对电阻率变化率与荷载近似呈线性关系,通过拟合,斜率K的绝对值为0.316 9.在相同荷载作用下,改变加载速度和加载位置对条块的相对电阻率变化率影响不大.结论 碳纤维混凝土条块具有较好的压敏性.荷载与相对电阻率变化率近似呈线性关系,从而可实现动态称重.     

强水敏砂岩油藏水驱油相对渗透率曲线异常分析

以强水敏砂岩油藏实际岩样为例,通过水驱油渗流实验和渗流物理分析,探讨强水敏砂岩油藏水驱油过程相对渗透率曲线异常现象及其对油藏开发的影响。     

轧机油膜轴承相对间隙优化设计

在选定润滑油品、给定轧制速度和轧制压力的情况下,利用大型有限元分析软件ANSYS对油膜轴承和润滑油膜进行双向流固耦合分析,计算分析了考虑温度变化的不同相对间隙时的油膜及衬套的受力变形情况,得到了衬套受力变形及温度分布规律,并利用疲劳极限求出轴承的最佳相对间隙,为轴承结构优化提供理论数据。     

中国经济结构转型琐谈

中国要真正转变经济结构、要保持中国的中长期可持续发展就要使投资率和消费率维持相对合理的比例关系。     

基于容量的相对最小影响资源分配算法

在对现有的波长资源分配算法进行了研究和分析的基础上,提出了一种基于容量的相对最小影响波长资源分配算法.该算法通过定义基于容量的影响因子,分析受当前波长分配影响之后各路径在各波长上的可用信道数,更为精确地描述了当前分配波长对于受影响路径的路径容量产生的影响.仿真结果表明,新的算法降低了网络阻塞率,提高了网络资源利用率.