摘要：Covalent organic frameworks(COFs)have lately emerged as a blooming class of potential materials for photocatalytic water splitting because of their high crystallinity,huge surface areas,and structural ***,the photocatalytic performance for most pure COFs face some limitations factors,such as the significant recombination of photogenerated carriers and slow charge ***,a novel thioether-functionalized pyrene-based COF(S_(4)-COF)was effectively produced and chosen as a support for the immobilization of ultrafine gold nanoparticles(Au NPs).S_(4)-COF photocatalyst with Au as cocatalyst demonstrates remarkable photocatalytic activity with a H_(2) generation rate of 1377μmol g^(−1) h^(−1) under visible light(>420 nm),which is ca.4.5-fold increase comparing to that of pure S_(4)-COF(302μmol g^(−1) h^(−1)).Au NPs anchored on S_(4)-COF possess an ultrafine size distribution ranging from 1.75 to 6.25 nm with an average size centered at 3.8 nm,which benefits from the coordination interaction between thioether groups and ***,the produced Au@S_(4)-COF can generate a stable photocatalytic H_(2) generation during the four recycles and preserve its crystallinity structure after the stability *** Au NPs anchored on the S_(4)-COF photocatalyst can greatly accelerate the separation of photogenerated carriers and increase charge transfer because of the combined function of Au NPs and thioether *** a method can not only prevent the aggregation of Au NPs onto thioether-containing COFs to achieve long-term photostability but also allow uniform dispersion for an ordered structure of *** work provides a rational strategy for designing and preparing COF-based photocatalysts for solar-driven H_(2) production.

摘要：Solar-driven water splitting is considered as a promising method to mitigate the energy crisis and various environmental *** vanadate(BiVO_(4))is photoanode material with tremendous potential for photoelectrochemical(PEC)water ***,its PEC performance is severely hindered owing to poor surface charge transfer,surface recombination at the photoanode/electrolyte junction,and sluggish oxygen evolution reaction(OER)*** this regard,a novel solution was developed in this study to address these issues by decorating the surface of BiVO_(4)with cobalt sulfide,whose attractive features such as low cost,high conductivity,and rapid charge-transfer ability assisted in improving the PEC activity of the BiVO_(4)*** fabricated photoanode exhibited a significantly enhanced photocurrent density of 3.2 m A cm^(-2)under illumination at 1.23 V vs.a reversible hydrogen electrode,which is more than 2.5 times greater than that of pristine BiVO_(4).Moreover,the Co S/BiVO_(4)photoanode also exhibited considerable improvements in the charge injection yield(75.8%vs.36.7%for the bare BiVO_(4)film)and charge separation efficiency(79.8%vs.66.8%for the pristine BiVO_(4)film).These dramatic enhancements were primarily ascribed to rapid charge-transport kinetics and efficient reduction of the anodic overpotential for oxygen evolution enabled by the surface modification of BiVO_(4)by Co *** study provides valuable suggestions for designing efficient photocatalysts via surface modification to improve the PEC performance.

摘要：利用NTC型热敏电阻,采用补偿法思想(补偿电路)设计了热敏电阻温度计,并进行测温验证了设计效果.补偿法设计温度计是一种完全区别于电桥法的温度计设计新思路,原理简单,实验设备要求低,可设计性强,特别适合于开发成新的设计性实验.

摘要：在阐述思政元素融入专业课所存在的问题基础上,提出了课程思政融入专业课程的具体实施方案——从工匠精神出发,以任务驱动为核心,结合数字媒介、课程作业、实践平台等多途径教学手段,形成具有特色的材料加工专业课程思政教学。本文具有一定的理论指导意义和推广价值。

摘要：研究目的:半整体式桥台无伸缩缝桥(简称半整体桥)是一种新型桥梁结构形式。由于主梁与桥台刚接,在昼夜及季节性环境温度等长期作用下,主梁会使桥台沿纵桥向发生往复变位,进而引起台后土体的压力变化,产生土抗力。为研究半整体桥的台后土抗力分布规律以及中长期环境温度对土抗力的影响,开展中长期环境温度作用下半整体桥台-土相互作用拟静力试验研究。研究结论:(1)台后土抗力随环境温度变化的规律为在第1~6中周期(约对应由春季至夏季的第一个升温区间段)内快速上升,在第6~16中周期(约对应由夏季至冬季的降温区间段)内有所减小,在第16~20中周期(约对应由冬季至春季的第二个升温区间段)又开始增加,但相比于第一个升温区间段内的增速明显减缓;(2)中长期环境温度作用下台后土抗力沿埋深方向的分布规律为先增加后减小,并在埋深0.8h处达到最大;(3)各周期内土抗力沿纵桥向的规律为在距桥台较近的区域,台后土抗力快速减小;在距桥台较远的区域,土抗力缓慢减小,并在距台背1.0h位置处土抗力基本减小至0;(4)经过一个全年大周期的环境温度作用后,台后土抗力存在明显累积增大效应,其累积效应与土体的纵桥向位置及竖向深度具有较强的相关性;(5)本研究结果可为半整体桥的设计计算以及相关规范制定提供参考。

摘要：已建地下室的综合馆因上部建筑方案变更后现设计为西安曲江电竞中心,原综合馆仅地下室施工完成,考虑已建结构的特点、施工工期等因素,上部结构方案经比选后选用混凝土柱+钢梁的混合框架结构体系。混凝土柱与钢梁之间采用改进的柱贯通梁组合节点形式,并采用有限元软件进行抗震性能分析。结果表明:改进的柱贯通梁组合节点极限位移角为1/40,变形能力较好;混凝土柱与环加劲板、钢梁的刚度相差较大,加载后期,核心区混凝土损伤严重,因而结构耗能能力一般。在原地下室框架柱上部通过布置摇摆柱来解决新增混凝土柱的弯矩传递和无法植筋问题,给出了摇摆柱的上部和柱脚节点做法。对局部楼板大开洞区域进行应力对比分析,设置连接板带来保证楼板的水平力传递;在原地下室上部新增混凝土柱时,通过对原地下室框架柱增大截面后在其周围植筋,保证竖向荷载的传递。

摘要：为研究再生砌体填充墙-型钢再生混凝土框架结构的抗震性能,试验设计了1榀再生混凝土框架和2榀再生砌体填充墙-型钢再生混凝土框架并进行低周往复加载试验。试验结果表明:纯框架试件及带填充墙框架试件均为延性破坏,填充墙沿框架平面对角线区域破坏较为严重,梁端与柱端先后出现塑性铰,符合“强柱弱梁”的抗震设计概念;带填充墙框架相比纯框架峰值承载力提升80%左右,平均位移延性系数大于6,表明其具有良好的变形能力;带填充墙框架在加载前期耗能能力强于纯框架试件,后期因填充墙破坏而承载能力迅速下降,极限位移较小,耗能能力弱于纯框架试件;轴压比越大,带填充墙框架峰值荷载后的延性和耗能能力下降越快。基于现有等效斜压杆理论对试件进行Pushover分析,结果表明Klingner模型与试验结果吻合最好。合理布置的填充墙可作为结构抗震的第一道防线,性能点处结构满足“大震不倒”的抗震要求。

摘要：偏高岭土(MK)和高炉矿渣(GGBS)是制备地聚合物常用的固体原材料,由两者复合制备的地聚合物具有常温固化,黏结强度高以及快硬早强的优点,能够作为修复材料,然而两者比例改变带来的修补材料的耐久性变化尚未得到充分理解。针对该研究的不足,通过设置不同的GGBS/(MK+GGBS)值(质量比:0,20%,40%,60%,80%,100%),测试地聚合物修补砂浆的吸水量、接触角试验、目视观察地聚合物的泛碱程度以及测试地聚合物泛碱前后的力学性能变化对地聚合物的抗泛碱能力的影响,将地聚合物浸入0.5M(mol/L)的HCl溶液中1,3和5 d,通过目视观察以及测试地聚合物的质量和强度损失,对地聚合物的抗酸性能做出评估。热重(TG)、傅里叶红外光谱(FTIR)和X射线衍射(XRD)被用于对高Ca体系和低Ca体系的耐酸机理做出讨论。另外,考虑到修补材料与基体的相容性同样重要,在干缩测试中以水泥为对照,在酸化测试中以黏结试件为对象,并测试地聚合物和水泥的热变形,以评估两者的相容性。研究结果表明,MK和GGBS比例合适时,地聚合物拥有更为致密的结构,表现出较低的吸水量和泛碱程度。MK含量较高时,产生的地聚合物凝胶有更强的耐酸性。适当增加GGBS,能够通过提升结构的致密性使得修补材料的耐久性得到提升。研究成果可为刚性路面的高性能耐久的快速修补材料研发提供技术参考。

摘要：远程开放教育教学过程的设计以及教学过程质量管理,是现代远程教育中的核心问题。文章论述了教学过程优化设计的原则与具体的设计方法,并对开放教育教学过程的质量管理进行了全面阐述。

摘要：近年来,贵重的手性催化剂的回收与再利用越来越引起化学工作者的关注,而离子液体在催化剂回收方面有其独特的优势。本文综述了离子液体在手性催化反应中的应用,在回收催化剂的同时,也能一定程度上提高催化剂的催化效率:着重介绍了新型含咪唑盐手性催化剂及其在不对称催化中的应用,由于它在离子液体和有机溶剂的显著差异可以很容易地得到回收,并且能一定程度地稳定催化剂,提高催化效率,这对我们设计合成新型可回收的催化剂具有重要的借鉴意义。