摘要：To solve the defects of bottom concave appearing in the extrusion experiments of complex hollow aluminium profiles,a 3D finite element model for simulating steady-state porthole die extrusion process was established based on HyperXtrude software using Arbitrary Lagrangian–Eulerian(ALE)*** velocity distribution on the cross-section of the extrudate at the die exit and pressure distribution at different heights in the welding chamber were quantitatively *** obtain an uniformity of metal flow velocity at the die exit,the porthole die structure was optimized by adding baffle *** optimization,maximum displacement in the Y direction at the bottom of profile decreases from 1.1 to 0.15 mm,and the concave defects are remarkably *** research method provides an effective guidance for improving extrusion defects and optimizing the metal flow of complex hollow aluminium profiles during porthole die extrusion.

摘要：Bending deformation behaviors of solution treated(ST),natural aged(NA)and T6tempered6063aluminum alloy sheetswere studied by three-point bending *** changes of bending force,interior angle,bending radius and sheet thickness in thefillet region were analyzed by experimental measurements and numerical *** results showed that the bendingcharacteristics were strongly dependent on the heat treatment *** T6alloy sheets were bent more sharply and localplastic deformation occurred severely in the fillet ***,the ST and NA alloy sheets exhibited relatively uniform bendingdeformation and large bending *** bending force of T6alloy was the highest,followed by the NA alloy and that of the STalloy was *** unloading,as compared with the ST and NA alloys,the springback of T6alloys was markedly *** time showed a positive sensitivity on the springback and non-uniform bending *** bending characteristics areattributed to the combined effects of yield strength,yield ratio and coefficient of neutral layer.

摘要：对古建筑修复中使用的偏高岭土基地聚合物进行了XRD晶相分析和SEM形貌分析,结果表明,在短龄期内,水化反应与聚合反应同时进行,反应进行到一定程度后,水化反应逐渐停止,聚合反应成为主导.NMR核磁共振与FTIR红外光谱分析发现,地聚合反应发生时,偏高岭土中以多种配位形式存在的铝相均向四配位转化,且对称的Si-O-Si伸缩振动吸收峰偏移,变为非对称的伸缩振动,同时聚合反应后出现铝氧四面体内的振动吸收峰,表明铝氧四面体取代部分硅氧四面体,形成新的网络聚合结构.

摘要：公众作为地方政府服务对象,其满意度在很大程度上能够反映公共政策的实施效果。精准扶贫的提出与实施有利于地方政府更有针对性地对贫困户进行帮扶,为了了解地方政府精准扶贫的公众满意度,本文借鉴ACSI模型,结合我国农村地区精准扶贫实际情况,构建地方政府精准扶贫政策公众满意度模型;以江西省部分农村为例,通过设计问卷、实地调研获得数据,运用结构方程模型(SEM)实证分析公众对精准扶贫政策的满意度。研究发现:精准扶贫感知质量是影响公众满意度的主要因素,二者呈正相关关系;公众期望与精准扶贫感知质量、公众满意度负相关;公众满意度对公众抱怨和公众信任具有正相关影响。由此提出提高精准扶贫公众满意度的相关建议,以期对完善精准扶贫提供理论启示。

摘要：目前传统的罐道测量以人工测量为主,测量不便,效率低下,且测量数据不精确,不能对罐道的变形程度进行了深入的分析。因此设计了一种基于单片微处理器的便携式罐道间距专用测量仪。该测量仪采用小量程高精度激光传感器,从上井口到下井口每间隔几米保存一组数据,最终以图形的方式直观地绘出罐道的变形程度。与传统的人工测量方法相比,该立井罐道间距测量仪测量精度高、数据量大、自动化程度高。

摘要：波形整形技术使试样满足应力均匀条件和恒定应变率加载,石英片检测试样两端的应力均匀性,获得微弱的透射信号。对开始加载阶段径向惯性效应带来的轴向应力附加值给予了计算修正,得到了肌肉在不同加载方向和不同应变率下的应力应变曲线。结果发现:肌肉材料的应力应变曲线呈现粘弹性材料所具有的凹向上特征,由最小显著差数法进行统计分析,发现猪后腿肌肉的力学性能对应变率和加载方向都敏感。沿纤维方向压缩时肌纤维易发生压缩失稳,强度比垂直纤维方向低。

摘要：The size effects of microstructure of lattice materials on structural analysis and minimum weight design are studied with extented multiscale finite element method（EMsFEM） in the paper. With the same volume of base material and configuration, the structural displacement and maximum axial stress of micro-rod of lattice structures with different sizes of microstructure are analyzed and *** is pointed out that different from the traditional mathematical homogenization method, EMsFEM is suitable for analyzing the structures which is constituted with lattice materials and composed of quantities of finite-sized *** minimum weight design of structures composed of lattice material is studied with downscaling calculation of EMsFEM under stress constraints of micro-rods. The optimal design results show that the weight of the structure increases with the decrease of the size of basic sub-unit cells. The paper presents a new approach for analysis and optimization of lattice materials in complex engineering constructions.

摘要：Network function virtualization （NFV） is a newly proposed technique designed to construct and manage network fimctions dynamically and efficiently. Allocating physical resources to the virtual network function forwarding graph is a critical issue in NFV. We formulate the forwarding graph embedding （FGE） problem as a binary integer programming problem, which aims to increase the revenue and decrease the cost to a service provider （SP） while considering limited network resources and the requirements of virtual functions. We then design a novel regional resource clustering metric to quantify the embedding potential of each substrate node and propose a topology-aware FGE algorithm called ＇regional resource clustering FGE＇ （RRC-FGE）. After implementing our algorithms in C＋＋, simulation results showed that the total revenue was increased by more than 50 units and the acceptance ratio by more than 15%, and the cost of the service provider was decreased by more than 60 units.

摘要：在区分个体创造力和创新的基础上,文章考察了225名企业员工的核心自我评价、集体主义导向与上司评定的创新行为的关系。结果表明个体创新过程中的创意产生和创意实施行为正相关;核心自我评价与创意产生正相关,但与创意实施无显著相关关系;集体主义导向在核心自我评价与创意产生和实施行为关系中均起调节作用:对集体主义导向较强的员工来说,核心自我评价对创新行为的影响反而较弱,对低集体主义导向的员工来说,核心自我评价对创新行为的影响则相对较强。文章最后对研究结果进行了讨论,并指出了研究的贡献与不足。

摘要：Background:Handan Eye Study (HES),a large population-based cohort study in rural area of northern China,was one of the few studies focusing on the major eye diseases of rural Chinese *** aim of this study was to introduce the design,methodology and to assess the data quality of the follow-up phase of ***:All participants were recruited in Yongnian county of Handan city between 2012 and *** outcomes were measured by visual quality scales and ocular *** performed the Chi-square test to make comparison of categorical data among groups,One-way analysis of variance and Kruskal-Wallis test was applied to make comparison of continuous data among groups,a post-hoc test was done to make further pairwise ***-class correlation coefficients (ICCs) and Kappa coefficients were used to evaluate the consistency between different *** regression was used to explore the influence factors of death,odds ratio (OR) and 95% confidence interval (CI) were used to estimate the effect size of each influence ***:The follow-up rate was 85.3%.Subjects were classified into three groups:the follow-up group (n =5394),the loss to follow-up group (n =929),and the dead group (n =507),comparison of their baseline information was *** with the other two groups,age of the dead group (66.52 ± 10.31 years) was the oldest (Z =651.293,P < 0.001),male proportion was the highest (59.0 %)(x2 =42.351,P < 0.001),only 65.9 % of the dead finished middle school education (Z =205.354,P < 0.001).The marriage percentage,body mass index (BMI),best-corrected visual acuity (BCVA),and intra-ocular pressure of the dead group was the lowest *** equivalent error (SER) of the dead group was the ***,history of smoking,hypertension,diabetes,and heart disease were more common in the dead *** analysis showed that age (OR =1.901,95% CI:1.074-1.108),gender (OR =0.317,95% CI:0.224-0.448),and BCVA (OR =0.282,95%