摘要：The main reason for the high strength in near-βtitanium alloys is the ultrafine precipitation of the acicular secondary a phase in theβ*** purpose of this study is to use the pseudo-spinodal mechanism to obtain the ultrafine a phase for the design of a new high-strength near-γtitanium *** calculations and TC21-(TC21+15 Mo)diffusion couple composition gradient experiments were used to demonstrate that TC21+3 Mo alloy can undergo a pseudo-spinodal decomposition to obtain the ultrafine a phase,resulting in a high-strength *** adjusting the heat treatment process to obtain a bimodal microstructure,the alloy exhibits a good balance between ultimate tensile strength(1351 MPa)and plasticity(8.5%strain).Thus,it was demonstrated that the pseudospinodal mechanism combined with a high-throughput diffusion couple technique is an effective method for designing high-strength titanium alloys.

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：Erratum to:International Journal of Minerals, Metallurgy and Materials Volume 26, Number 9, September 2019, Page 1151https://***/10.1007/s12613-019-1854-1The original version of this article unfortunately contained a mistake. The presentation of Fig. 11 was incorrect. The correct version is given below:

摘要：Advanced programmable metamaterials with heterogeneous microstructures have become increasingly prevalent in scientific and engineering disciplines attributed to their tunable ***,exploring the structure-property relationship in these materials,including forward prediction and inverse design,presents substantial *** inhomogeneous microstructures significantly complicate traditional analytical or simulation-based ***,we establish a novel framework that integrates the machine learning(ML)-encoded multiscale computational method for forward prediction and Bayesian optimization for inverse *** prior end-to-end ML methods limited to specific problems,our framework is both load-independent and *** means that a single training session for a constitutive model suffices to tackle various problems directly,eliminating the need for repeated data collection or *** demonstrate the efficacy and efficiency of this framework using metamaterials with designable elliptical holes or lattice honeycombs *** accelerated forward prediction,we can precisely customize the stiffness and shape of metamaterials under diverse loading scenarios,and extend this capability to multi-objective customization ***,we achieve topology optimization for stress alleviation at the crack tip,resulting in a significant reduction of Mises stress by up to 41.2%and yielding a theoretical interpretable *** framework offers a general,efficient and precise tool for analyzing the structure-property relationships of novel metamaterials.

摘要：Assembling individual line phase filters to form a multi-channel filter bank allows the synthesis filter to be similar to corresponding analysis filters, and the design calculation can be simple. The appropriate relations between synthesis filters and analysis filters eliminate most aliasing resulting from decimation in non-uniform maximally decimating filter banks, and LS algorithm and Remez algorithm are used to optimize the composite character. This design method can achieve approximate Perfect-Reconstruction. An example is given in which the general parameter filters with approximate line phase are used as units of a filter bank.

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：The pore structure of porous scaffolds plays a crucial role in bone *** prevalent bone implant structure in clinical practice is the traditional cubic ***,the traditional cubic structure exhibits sharp edges and junctions that are not conducive to cell adhesion or *** this study,a double gyroid(DG)Ti6Al4V scaffold based on a triply periodic minimal surface(TPMS)structure was devised,and the osseointegration performance of DG structural scaffolds with varying porosities was *** tests revealed that the elastic modulus and compressive strength of DG structural scaffolds were sufficient for orthopedic *** vitro cellular experiments demonstrated that the DG structure significantly enhanced cell proliferation,vascularization,and osteogenic differentiation compared to the cubic *** DG structure with 55%porosity exhibited the most favorable *** vivo experiments in rabbits further demonstrated that DG scaffolds could promote neovascularization and bone regeneration and maturation;those with 55%porosity performed *** the surface area,specific surface area per unit volume,and internal flow distribution characteristics of gyroid and DG structure scaffolds,the latter are more conducive to cell adhesion and growth within *** study underscored the potential of DG scaffolds based on the TPMS structure in optimizing the pore structure design of titanium scaffolds,inducing angiogenesis,and advancing the clinical application of titanium scaffolds for repairing bone defects.

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：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。