摘要：The diffusion-multiple method was used to determine the composition of Ti−6Al−4V−xMo−yZr alloy(0.45<x<12,0.5<y<14,wt.%),which can obtain an ultrafine α *** show that Ti−6Al−4V−5Mo−7Zr alloy can obtain an ultrafineαphase by using the α″phase assisted *** bimodal microstructure obtained with the heat-treatment process can confer the alloy with a good balance between the strength and *** deformation mechanism is the dislocation slip and the{1101}twinning in the primary α *** strengthening mechanism is α/β interface *** interface of(0001)α/(110)β has a platform−step structure,whereas(1120)α/(111)βinterface is flat with no steps.

摘要：Mg-Al alloys have excellent strength and ductility but relatively low thermal conductivity due to Al *** accurate prediction of thermal conductivity is a prerequisite for designing Mg-Al alloys with high thermal ***,databases for predicting temperature-and composition-dependent thermal conductivities must be *** this study,Mg-Al-La alloys with different contents of Al2La,Al3La,and Al11La3phases and solid solubility of Al in the α-Mg phase were *** influence of the second phase(s) and Al solid solubility on thermal conductivity was *** results revealed a second phase transformation from Al_(2)La to Al_(3)La and further to Al_(11)La_(3)with the increasing Al content at a constant La *** degree of the negative effect of the second phase(s) on thermal diffusivity followed the sequence of Al2La>Al3La>Al_(11)La_(3).Compared with the second phase,an increase in the solid solubility of Al in α-Mg remarkably reduced the thermal *** the basis of the experimental data,a database of the reciprocal thermal diffusivity of the Mg-Al-La system was established by calculation of the phase diagram (CALPHAD)*** a standard error of±1.2 W/(m·K),the predicted results were in good agreement with the experimental *** established database can be used to design Mg-Al alloys with high thermal conductivity and provide valuable guidance for expanding their application prospects.

摘要：A wide range of terrain features and landforms, which are exemplified by intricate geological formations and diverse rock compositions, are found in the western mountainous regions of China. These areas frequently encounter geological disasters. As one of the natural disasters, landslides lead to considerable loss of human life and property. Considering mitigation of the losses caused by landslide disasters, a necessary measure for disaster prevention and mitigation involves conducting detailed investigations and monitoring of landslides, which is also the cornerstone of landslide warning. This study compares and analyzes the feasibility of the magnetotelluric detection method for landslides using the results of engineering geological surveys and landslide monitoring. The study aims to address the scientific problem of the validity of using magnetotelluric methods to detect landslide development processes. The Tangjiawan landslide signal on the left side of the K94+000~K94+145 section of the Wenma Expressway is analyzed by employing engineering geological survey, magnetotelluric detection, landslide monitoring, landslide analysis, and other methods. Analysis results provide the static electrical characteristics of lithology, structure, and groundwater, as well as the dynamic electrical characteristics of landslide development. This study focuses on analyzing the relationship between the methods of magnetotelluric detection and engineering geological surveys and the results of landslide monitoring. The workflow and methods for data collection, processing, inversion, interpretation, and analysis using the magnetotelluric method to detect the dynamic development process of landslides are presented in the conclusion. Preliminary conclusions indicate a strong correlation between the dynamic changes in magnetotelluric wave impedance with the surface displacement of landslides and the dynamic changes in groundwater. The use of the magnetotelluric method for landslide detec

摘要：提供了一个详细的国际海事卫星地面终端天线阵单元的设计,该设计采用单馈点圆极化口径耦合的多层微带天线形式,使用低价格、低介电常数的泡沫塑料,以降低成本和拓宽天线的阻抗带宽.测量结果表明,天线的阻抗带宽(电压驻波比,VSWR≤2)和圆极化带宽(轴比AR≤3dB)分别达到18.8%和12.3%.同时,天线在1593MHz的增益达到9.4dBi.

摘要：根据运营期渗漏水隧道注浆治理对注浆材料的要求,研究普通硅酸盐水泥、水泥-水玻璃、超细水泥及聚合物水泥主要性能参数,设计开元隧道3个地质条件相似试验段,采用普通水泥、超细水泥及聚合物水泥进行现场注浆,通过雷达探测及现场工况进行注浆效果评估,结合注浆技术可行性、注浆效果及经济性,分析运营期隧道不同渗漏水条件下注浆材料适用性。研究结果表明:聚合物水泥浆液流动度、结石率及结石体强度较大,聚合物水泥浆液对含水构造渗漏水通道封堵密实;超细水泥适用于微孔隙及微裂隙渗水区域,聚合物水泥适用于裂隙密集渗漏水区或表面渗水区,普通水泥适用于空洞较大区域,水泥-水玻璃浆液适用于流量水压较大漏水区域。

摘要：本文就一个相对简单的网管、防火墙系统的设计与实现进行了介绍。文中就ＳＮＭＰ协议以及一次性口令也作了一定的介绍。

摘要：从面向认知的指挥控制系统(commandandcontrol,C2)界面设计的重要意义入手,概述该领域国内外研究现状;总结当前指挥控制系统界面使用中存在的典型认知问题,并对问题形成的原因进行了分析;设计一种面向认知的指挥控制系统界面设计技术框架。该框架设计阶段覆盖完整,所用方法及技术针对性强,可较好指导面向认知的指挥控制系统界面设计问题,为提高指挥控制系统整体作战能力提供支持。

摘要：琴台美术馆外形独特,需要在屋面形成“梯田”流淌的奇妙景观,因此导致屋面汇水分区繁杂。屋面雨水的径流组织和排放需要与其造型紧密契合,除了最大限度地减少采用雨水系统管道快速外排外,还需要结合海绵城市建设目标要求,优化屋顶海绵设施选型,减少快排的雨水径流总量。为了确保屋面雨水排放安全,防止美术馆藏品在储藏、陈列过程中受到水渍影响,在兼顾室内空间布置丰富多样的条件下,采用北侧大屋面导水沟集中汇水、设置虹吸雨水沉箱排水,南侧大屋面导水沟分区汇水、重力自流排水,实现了屋面雨水排水的生态与安全完美组合。

摘要：分析了中国石油兰州石化公司1.2 Mt/a延迟焦化装置运行中存在的问题,主要为冷焦污水含油、COD和悬浮物含量较高,不能直接作为冷切焦水回用;分馏塔塔顶酸性水和焦化汽柴油携带焦粉,影响下游装置的长周期运行;加热炉工艺联锁存在设计缺陷,不能有效投用。针对这些问题,通过技术改造,增上冷焦污水处理系统,处理后的冷焦水实现了回用;增上酸性水除焦粉系统及焦化混合汽柴油过滤器,减少了焦粉携带对下游装置的影响;加热炉工艺联锁由"一取一"改为"三取二",实现了联锁的有效投用。

摘要：依托某高层建筑深基坑工程,通过现场试验获得不同施工阶段组合支护结构及基坑关键部位的变形规律。基于土体硬化模型建立深基坑组合支护体系的三维数值模型,对基坑开挖施工进行全过程模拟,分析支护结构体系的桩身弯矩、桩身位移和土压力分布规律。针对反压土的顶宽、高度、坡度以及斜支撑的间距、直径等影响因素设计正交试验,对围护桩受力变形的影响参数进行敏感性分析,并提出优化建议。研究结果表明:围护桩最大位移与最大正弯矩随反压土顶宽、高度、斜支撑直径的增大而减小,随着反压土坡度、斜支撑间距的增大而增大。桩身变形影响因素敏感性从大至小依次为反压土坡高、顶宽、反压土坡度、斜支撑间距和斜支撑直径;对组合支护体系进行设计时,建议在确定土坡自稳角度的前提下,尽量增大反压土土坡高度。