黑龙江东宁金厂金矿区多元信息量统计成矿预测

金厂金矿床为近年来在黑龙江东宁地区发现的一特大型浅成高硫化型岩浆热液金矿床,其形成与燕山晚期花岗斑岩类等岩浆侵入活动有关。在矿床地质研究基础上,采用多元信息量统计预测方法,在金厂矿区开展了成矿预测研究,圈定了4个进一步找矿工作靶区,为该区进一步找矿勘查工作指明了方向。     

覆盖层上面板堆石坝筑坝材料反演分析与安全性研究

以双溪口面板堆石坝实测沉降监测资料为基础,通过基于免疫遗传算法的位移反分析法对堆石料E-B模型参数进行反演分析,获取了符合工程实际的模型参数。根据反馈分析得到的计算结果,采用邓肯-张弹性非线性E-B模型,分析研究了大坝竣工期及蓄水期的变形及应力分布状态,计算结果表明,大坝蓄水期位移增量较小,面板应力正常,大坝运行安全。     

无熟料高炉矿渣水泥对Cl-的抗渗特性研究

无熟料高炉矿渣水泥对Cl-的抗渗有独特的性能,为此,以石膏和石灰作为激发剂配制无熟料高炉矿渣水泥后,用电通量法等科学手段进行了Cl-的抗渗试验.主要介绍了试验采用的原材料及配合比,试验采用的方法及试验结果分析.结果表明,无熟料高炉矿渣水泥的效果远远好于硅酸盐水泥和矿渣水泥.     

一种新型 NoC 拓扑结构的研究

提出一种片上网络(NoC)拓扑结构--Spidemet,并对其网络的主要属性如节点度、网络直径、连通度、平均最短路径和平均最短布线等进行了研究.首先将Spidemet与其它拓扑结构的属性进行比较,并采用模拟退火的布局映射算法,根据 NoC 的布局结构,将不同的节点放入 NoC 网格中,即给出一组被绑定和调度的可供选择IP核,在满足IP核所占用芯片面积的条件下将选择的IP核映射到网络中,目标是最小化平均布线长度.网络拓扑结构图描述文件和IP核任务图作为输入.实验中运行基准程序,结果表明提出的网络拓扑结构更适合于将来的 SoC 的片上网络构造.     

A notch critical plane approach of multiaxial fatigue life prediction for metallic notched specimens

An approach based on the local stress response is proposed to locate the fatigue critical point for metallic blunt notched specimens under multiaxial fatigue loading. According to the stress analysis, both stress gradient and gradient of loading nonproportionality exist at notch root. The plane in the vicinity of the notch that passes through the fatigue critical point and experiences the maximum shear stress amplitude is defined as the critical plane for notch specimens (CPN). Furthermore, the Susmel's fatigue damage parameter is modified to assess fatigue life of notched components by combining CPN and the theory of critical distance (TCD). The multiaxial fatigue test of the thin‐walled round tube specimens made of Ni‐base alloy GH4169 is carried out to verify the above approaches. In addition, test data of two kinds of materials are collected. The results show that the maximum absolute error of the fatigue critical point is 9.6° and the majority of the predicted life falls within the three‐time scatter band.     

沈84块高凝油藏水淹层测井评价参数及其应用

针对辽河沈84块沙三段下部高含水期高凝油藏储层水淹状况和特征，依据灰色系统油田开发分析方法及准则，利用测井、钻井取心、试油及有关地质资料，匹配、拟合和提取参数，分别以其特征性参数对高含水期油藏岩性、物性和水淹状况进行统计，采用正态统计特征值建立测井评价参数标准，以其准确率和分辨率自动组合放大，建立测井评价参数标准的权系数。通过该区沙三下的174口井高凝油藏水淹层测井评价参数研究的分析解释，划分出砂砾岩、含砾砂岩、中粗砂岩、细砂岩、粉砂岩和泥岩等岩性剖面，评价解释了不同类型的储层以及不同物性的油层、弱水淹层、中水淹层、强水淹层及水层，阐明了沈84块沙三下高凝油藏水淹状况及剩余油纵向分布规律。     

金属小目标对电容近炸引信电极电容的影响

利用导体之间感应系数与自电容、互电容之间关系，从理论上论述了金属小目标靠近电容近炸引信电极时自电容和互电容的变化规律，并且根据有限元计算的方法验证了推导的结论。     

基于MySQL 的天地一体化网络结构数据库构建

为满足天地一体化网络可视化的需要,构建基于MySQL的数据库系统平台.通过对天地一体化网络结构数据组成与特性的分析,依次设计节点数据、链路数据、网络数据的实体-联系图(entity relationship diagram,E-R)与数据表,构建天地一体化网络结构数据库;通过MySQL Workbench软件实现用户管理、数据管理与维护等功能.结果表明,该数据库可为后续天地一体化网络可视化的研究提供有力数据支撑.     

On the Capacity of Cluster-Based Cooperative MIMO Cellular System with Universal or Fractional Frequency Reuse

The information-theoretic capacity for the cluster-based multicell cooperative processing (MCP) network with inter-cluster interference is investigated in this paper. An upper bound for the ergodic capacity is derived by the QR decomposition of the channel matrix, which is concisely expressed and close to the results from numerical simulations. Capacity results for the universal frequency reuse (UFR) network show that the cluster-based MCP system has great advantages over the non-cooperated system, and the capacity gain depends mainly on the size of the cooperative cluster, the radius of the cell and the path loss exponent (PLE). However, the cluster-based UFR system is still interference limited, whose capacity declines sharply due to the inter-cluster interference. Therefore, a cluster-based fractional frequency reuse (FFR) network is proposed to improve the system capacity, simulation results show that the cluster-based FFR system can outperform the UFR system, especially for the cases of small radius of cell or small PLE.     

Preparation and operation of gas diffusion electrodes for high-temperature proton exchange membrane fuel cells

Gas diffusion electrodes for high-temperature PEMFC based on acid-doped polybenzimidazole membranes were prepared by a tape-casting method. The overall porosity of the electrodes was tailored in a range from 38% to 59% by introducing porogens into the supporting and/or catalyst layers. The investigated porogens include volatile ammonium oxalate, carbonate and acetate and acid-soluble zinc oxide, among which are ammonium oxalate and ZnO more effective in improving the overall electrode porosity. Effects of the electrode porosity on the fuel cell performance were investigated in terms of the cathodic limiting current density and minimum air stoichiometry, anodic limiting current and hydrogen utilization, as well as operations under different pressures and temperatures.