摘要：This paper investigates the H∞ filtering problem for a class of linear continuous-time systems with both time delay and saturation. Such systems have time delay in their state equations and saturation in their output equations, and their process and measurement noises have unknown statistical characteristics and bounded energies. Based on the Lyapunov-Krasovskii stability theorem and the linear matrix inequalities （LMIs） technique, a generalized dynamic filter architecture is proposed, and a filter design method is developed. The linear H∞ filter designed by the method can guarantee the H∞ performance. The parameters of the designed filter can be obtained by solving a kind of LMI. An illustrative example shows that the design method proposed in this paper is very effective.

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：针对当前全膝置换手术机器人存在的占用手术空间大、术中患肢不能移动等问题,设计了一套新型的机械手结构,包括可调式的支撑臂、固定远端股骨的骨夹以及伺服电机驱动机械臂,并在实验室中搭建了机器人辅助全膝置换手术系统.实验证明该结构不仅彻底地解决了困扰传统机器人辅助手术中患者腿部的固定装夹问题,而且整个系统结构紧凑,大大方便了医生的手术干预,为机器人辅助膝关节手术的后续研究奠定了基础.

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：目的:优选核桃仁挥发性芳香物质成分的固相微萃取条件,并利用GC-MS法对比分析新疆产新鲜核桃仁与酸败核桃仁样品的芳香物质成分。方法:采用单因素试验和正交试验设计优化固相微萃取条件,利用GC-MS分析对比新鲜核桃仁与酸败核桃仁的成分。结果:优选得到的固相微萃取条件为:采用75μm CAR/PDMS萃取头,取样量为2.0 g,萃取温度为60℃,萃取时间为30 min。分别从新鲜核桃仁和酸败核桃仁中分离鉴定了28种和33种挥发性成分。结论:该实验优选的萃取方法简单、可行,可用于核桃仁中挥发性芳香物质的萃取。

摘要：依据流感传播规律,构建了一类具有疫苗接种和有限医疗资源的SVIR传染病模型,计算出了模型的控制再生数,证明了无病平衡点的稳定性,并用MATLAB进行了数值模拟,得到了接种疫苗可以延迟疾病爆发的高峰期,医疗资源越充足,感染规模越小.

摘要：炭烟颗粒和NO_(x)作为柴油机尾气的主要污染物严重危害了人体健康与环境.因此,炭烟与NO_(x)的催化净化得到了广泛关注.本文设计制备了具有独特孔结构的三维有序大孔(3DOM)ZSM-5分子筛催化剂,并将其作为载体,制备了一系列3DOM ZSM-5担载MO_(δ)(M=Mn,Fe,Co,Ce,Pr,W)的催化剂.所制备催化剂均具有独特的多级孔结构,有利于炭烟与NO_(x)等小分子的捕捉与传质,可进一步增强催化剂的催化性能.其中,MnO_(δ)/3DOM ZSM-5催化剂具有最佳的同时消除炭烟与NO_(x)的催化性能,其炭烟燃烧的峰值温度最低(453℃),80%以上NO转化率的初始温度最低(184℃)且温度窗口较宽(184~362℃).该催化剂优异的催化性能与其良好的氧化还原性能、丰富的酸位点、充足的活性氧以及丰富的多级孔结构有关.动力学测试结果表明,MnO_(δ)/3DOM ZSM-5催化剂具有最高的本征活性.根据催化剂的活性测试和原位漫反射红外光谱(in situ DRIFTS)结果,推断了该催化剂在不同温度下的反应机理.在低温(300℃)主要以炭烟燃烧为主,包括活性氧机理和NO_(2)辅助机理.

摘要：Floorplan is an important process whose quality determines the timing closure in integrated circuit(IC)physical *** generating a floorplan with satisfying timing result is time-consuming because much time is spent on the generation-evaluation *** machine learning to the floorplan stage is a potential method to accelerate the floorplan ***,there exist two challenges which are selecting proper features and achieving a satisfying model *** this paper,we propose a machine learning framework for floorplan acceleration with feature selection and model stacking to cope with the challenges,targeting to reduce time and effort in integrated circuit physical ***,the proposed framework supports predicting post-route slack of static random-access memory(SRAM)in the early floorplan ***,we introduce a feature selection method to rank and select important *** both feature importance and model accuracy,we reduce the number of features from 27 to 15(44%reduction),which can simplify the dataset and help educate novice ***,we build a stacking model by combining different kinds of models to improve *** 28 nm technology,we achieve the mean absolute error of slacks less than 23.03 ps and effectively accelerate the floorplan process by reducing evaluation time from 8 hours to less than 60 *** on our proposed framework,we can do design space exploration for thousands of locations of SRAM instances in few seconds,much more quickly than the traditional *** practical application,we improve the slacks of SRAMs more than 75.5 ps(177%improvement)on average than the initial design.

摘要：麦什扎黄河大桥主桥为一孔246 m下承式提篮钢箱—组合梁系杆拱桥,引桥为一孔40 m预应力混凝土异形现浇箱梁。主桥主拱为钢箱截面,拱轴线为二次抛物线,平面与铅垂线夹角为9°,面内矢跨比为1/5;主梁为钢混组合梁,钢结构部分为钢格构梁体系;主桥施工采用斜拉扣挂配合缆索吊法施工,先拱后梁。受桥梁设计理念、资金来源、分离式墩柱和未来水平系杆索更换等多种因素影响,该桥主引桥衔接位置设计为140 cm纵桥向牛腿,引桥小桩号侧端横梁设计为类似于门式框架墩盖梁的异形端横梁。纵桥向牛腿采用了加粗门字形骨架钢筋,引桥主梁预应力钢束从牛腿正中穿过等创新设计。异形端横梁采用了减小靠近张拉端横向预应力间距,优化横向预应力布置线形,改变张拉槽口形状和锚下钢筋网等诸多设计。