Microstructure and Properties of RS-P/M and I/M Al-Li Alloys

The Al-Li alloy powder was prepared by argon atomization.It was canned in an aluminum containerand then the compact powder billet and I/M Al-Li ingot were extruded into Φ17 mm at 450°C with anarea reduction of 34:1.Compared the tensile properties between RS-P/M and I/M A1-Li alloys,also stu-died their process,microstructure and the mechanism of the ageing strengthening in the alloy.     

基于云基础设施的服务部署优化问题建模

目前典型的云基础设施提供商所提供的虚拟机资源都是有限的规格类型,当同一个服务部署在不同配置的虚拟机上时,会体现出不同的性能。通过对基于云基础设施的SaaS层服务部署情况进行研究和分析,提出对服务部署策略进行优化的必要性,并将该服务部署优化问题抽象为多目标组合优化问题,对其进行数学建模;然后利用排队论,得出优化指标的计算方法,并进行实验验证。     

A QoE-based jointly subcarrier and power allocation for multiuser multiservice networks在多业务多用户网络场景下的基于QoE的联合子载波和功率资源分配

Quality of experience (QoE) is widely applied to reflect user’s satisfaction of the network service, which exactly conforms to the user-centric concept in 5G. In this paper, we propose a QoE-based subcarrier and power allocation algorithm for the downlink transmission of a multiuser multiservice system. For the subcarrier allocation algorithm, the rate proportional fairness factor is defined to ensure the fairness between users. Based on different QoE models of three services, i.e., file down (FD), video streaming and voice over internet protocol (VOIP), a multi-objective optimization method is exploited to allocate the power resource by minimizing the total power consumption and maximizing the mean opinion score (MOS) value of users simultaneously. Simulation results indicate that the proposed algorithm has less power consumption and higher QoE performance than the traditional proportional fairness (PF) algorithm. In addition, the proposed algorithm can achieve nearly the same fairness performance as the PF algorithm. Moreover, when the number of subcarriers becomes larger, the power assumption will be less but with little influence on both the QoE and fairness performances.     

探讨计算机网络故障分析及维护

计算机网络高度普及,已经成为生活中不可或缺的一部分,网络维护在计算机网络系统中有着重要地位,对于计算机网络故障的分析和研究是十分有必要的。对网络进行及时有效的维护,保障网络安全运行,分析计算机网络应用中的故障,并且结合具体的工作实践,加强计算机网络故障查处及维护有利于进一步提高计算机网络的运行质量。     

灌浆期小麦排水指标的试验研究

采用测坑原位受淹试验的方法研究了灌浆期小麦在涝渍胁迫下产量要素的响应。试验表明小 麦相对产量与涝渍综合水深具有良好的线性关系,小麦产量随着淹水历时的增加而降低。此外,淹水 还直接导致小麦千粒重降低、穗粒数减少、植株易倒伏等变化,而淹水对小麦有效穗数和株高影响不 大。最后,提出了排水控制指标与小麦减产率的关系形式。     

铜场水库大坝施工期渗流及变形资料分析

通过对坝体0＋090桩号及0＋145桩号施工期沉降及渗流监测成果的分析,初步分析了铜场水库大坝施工期在孔隙压力水和上游水位的共同作用下,心墙内渗透水位上升和沉降量明显偏大的原因。监测成果表明：①坝体施工期沉降量偏大但沉降监测成果符合一般变化规律;②心墙碾压铺料层厚度较厚,层间结合部压实密度较低,心墙压实度较低的部位有少量水渗入;③0＋090与0＋145断面的倾度为0.001%～0.067%,说明心墙沉降比较均匀。     

基于神经网络的渔业养殖成本与效益分析和预测

在单一的养殖模式下,由于破坏了生物多样性,这使得生态系统处于非常不稳定的状态,并对其他物种的生存,如珊瑚礁也产生了巨大影响。虽然混合水产养殖是一个有效的解决办法,但由于混养系统中的食物链的复杂特征,并没有有效的关于如何预测成本与效益的预测方法。本文试图从神经网络角度入手,为用户提供完整,准确的预报服务。