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%

摘要：设计了一个综合性化学实验——MCM-41型介孔二氧化硅材料的合成与表征。实验内容包括MCM-41型介孔二氧化硅材料的制备,以及采用扫描电子显微镜、X射线衍射、傅立叶红外光谱、比表面积与孔隙度分析等多种分析方法对其结构和形貌进行表征。本实验不仅可以锻炼学生的基本实验操作技能,还能使学生加深对相关课程理论内容的理解,并进一步激发学生探索化学前沿知识的兴趣。

摘要：复杂结构在爆炸驱动作用下的展开是展开型定向战斗部定向过程中的关键问题,对展开过程进行有效控制,有利于战斗部的起爆延时控制和破片利用率提高。针对复杂结构体的展开问题,基于JWL状态方程和第二类拉格朗日方程,从能量守恒出发推导了考虑爆轰产物膨胀过程和对目标命中状态的爆炸驱动展开模型。将驱动展开模型计算结果与文献实验结果进行对比,验证了爆炸驱动展开模型计算结果的准确性。结果表明,基于该模型的理论计算结果与实验结果的一致性较好,能较为精确地预测不同装药量下结构的展开时间;将辅助装药1与辅助装药2的质量比控制在1.5~1.7,结构体展开可达最佳命中姿态,更有利于命中目标。研究成果可充实定向战斗部设计理论,为展开型定向战斗部的设计提供参考。

摘要：加热炉炉温建模与优化设定是保证轧钢质量，提高企业经济效益的有效方法。本文在分析和研究步进式加热炉生产过程的基础上，集成Matlab和InTouch平台，开发了加热炉炉温建模与优化仿真软件包。软件包丰富的功能和友好的人机界面为加热炉炉温建模与优化的理论研究提供了良好的仿真环境，实现了仿真与控制的一体化。

摘要：利用超高性能混凝土(ultra high performance concrete, UHPC)材料特性,提出一种针对预制拼装桥墩的重力灌浆构造,即采用UHPC灌浆并依靠立柱自身重力完成拼接的插槽式连接构造。为研究该形式桥墩的抗震性能,设计完成了三个桥墩的拟静力试验,分别为整体现浇墩Z1、新型插槽式连接墩P1及现有“I型”连接墩P2,并采用OpenSees有限元软件做模拟分析,与试验结果对比分析。结果表明:三个桥墩的破坏形式一致,均为弯曲破坏;Z1墩与P1墩滞回曲线呈梭形,滞回环较为饱满,且相同位移加载循环下的滞回路径较为吻合,P2墩接口处钢筋与混凝土间黏结滑移影响较大,导致滞回环面积减小,桥墩整体滞回耗能能力降低;P1墩的耗能能力较Z1墩和P2墩分别提升7.0%、10.7%,呈现峰值荷载小、失效速率慢、极限位移大、滞回耗能多的骨架趋势。试验结果与有限元模拟结果较为吻合,抗震性能参数差幅在10.0%以内,新型插槽式连接墩可应用于实际工程。

摘要：研究了一种试验电压可覆盖12~252 k V、最大试验电流为63 k A的可以进行中、小容量断路器短路开断试验的合成回路试验系统。介绍了合成回路试验的试验原理,说明了该试验系统主回路各个部分的作用及合成试验的基本操作顺序,对试验线路的部分元件参数进行了计算确定。给出了该合成试验系统对控制设备和测量设备的要求。

摘要：聚焦雨水调蓄设施在海绵城市建设中的应用,从多个角度系统梳理了雨水调蓄设施的分类。基于实践调查分析,提出了雨水调蓄设施的不同应用场景及流程。重点针对雨水调蓄设施的优化配置与运行调度,识别出设计标准确定、设施配置优化、调蓄容积计算、运行调度管理4个关键的应用环节,并归纳总结了设计降水量计算、设施配置优化、调蓄容积计算方法及设施运行方式与调度管理现状。未来研究应关注降雨的空间变化特征、差异以及场次降雨对雨水径流控制目标的影响,研发能够集成雨洪模型与优化算法耦合、嵌套应用的技术平台,支持设施配置的全过程模拟、在线评价与优化应用,探索雨水调蓄设施之间梯级滞渗、多级调蓄、联动运行的水量调控增效机制。

摘要：在稳态循环(WHSC)与瞬态循环(WHTC)工况条件下,基于选择性催化还原(SCR)反应机理设计了前、后级不同氨氮比(ANR)和排气温度,研究了不同基材紧耦合SCR(cc-SCR)在不同ANR和温度下的性能表现.结果表明:增压器后端增加cc-SCR可大幅提升后处理系统的NO_(x)转化效率;在进行紧耦合催化剂选型时,前级喷射的ANR不宜超过0.8;相较于铜基cc-SCR,钒基cc-SCR具有N_(2)O生成量较低的优势;在低温条件下,铜基cc-SCR的NO_(x)转化效率优于钒基cc-SCR,300~450℃条件下,两种基材催化剂的NO_(x)转化效率相当;在稳态点排气温度为180℃时,钒基+铜基催化剂方案的NO_(x)总体转化效率随着ANR的增大而减小,铜基+铜基催化剂方案的NO_(x)总体转化效率随着ANR的增加而增大,高温时,两种方案对NO_(x)的转化相当;在热态WHTC循环条件下,铜基+铜基催化剂方案的NO_(x)总体转化效率随着ANR的增加而增大.

摘要：针对传统柔性作业车间调度问题,将机器动态预维护与绿色调度进行联合优化,以最小化最大完工时间、总碳排放量、总成本为优化目标建立集成优化模型。提出了一种改进的NSGA-I算法用于求解该模型,采用基于工序、机器和预维护的三层编码方式,设计了考虑工序分配、机器选择以及机器预维护策略的同步解码方案;改进了精英保留策略,设计了随着代数变化的自适应交又变异函数以及基于邻域搜索的变异算子。实验验证了改进算法在求解不同规模调度问题的有效性,所提的动态预维护策略较其他维护策略能更有效地求解预维护与柔性作业车间绿色调度协同优化问题。

摘要：The manual design of addendum surfaces on common CAD platforms is very tedious which requires many trialscorrections,which will certainly a ect the construction e ciency and quality of addendum surfaces,and then a ect the formability and quality of the workpiece in the process of sheet *** this paper,an automatic procedure based on parametric design method is proposed for the rapid construction of the addendum *** kernel of the parametric method is constructing boundary curves based on the shape of surfaces of workpiece and designing guide curves based on Hermite curve *** some simple parameters,the shape of the addendum surfaces could be controlled and adjusted *** addition,a minimum energy optimization method is employed to further optimize the constructed addendum surface.A finite element analysis for the sheet forming process is performed to evaluate the forming quality of constructed addendum *** instance illustrates that the addendum surface constructed by the proposed method could ensure both the overall smoothing of surfaces and the final forming quality,and it has a good e ect on springback after *** research proposes a smoothing parametric design method for addendum surfaces construction which could construct and optimize addendum surfaces rapidly.