非接触式位移/应变视频测量系统在弯曲试验中的应用

在弯曲梁试验中运用了非接触式位移/应变视频测量系统,对其跨中挠度及梁侧混凝土应变进行测量,同时使用应变片在梁的另一侧测量应变,与视频测量法进行对比。结果表明：两种仪器测得的应变的相对误差能够满足测量需要。在本试验的基础上而且非接触式位移/应变视频测量系统在试验前无需花费时间去贴应变片,测量结束后整个试验过程都被记录下来,可供以后研究。     

中小型城市医院建筑优化设计——以广东省中医院琶洲医院方案设计为例

文章分析我国中小型城市医院的发展状况和存在问题,指出中小型城市医院在建筑设计中要重点解决好两方面问题:创造更加亲切宜人的空间环境,以优质的服务吸引病人,增加收入;合理布局并引入绿色节能措施,以降低运营成本,节约开支。最后以一个具体设计方案为例,从医院建筑设计的几个主要方面,详细介绍一种空间与环境复合化的优化设计思路。     

基于DeST软件分析下对空调水系统管制的选择

以上海某新建办公为案例,运用DeST软件对8个朝向的外区及1个内区进行建模计算,通过对12个月(8760h)无空调状态下的自然室温的分析,提取供暖季12初至3月中旬在不同温度区间内的小时数,并结合温度分布来查看是否存在同时供冷供热需求,从而判定该办公空调水系统的形式,最终决定管制的选择。     

探讨建筑工程技术管理中控制要点与优化措施

文章主要阐述建筑工程施工技术的控制要点和优化措施,目的就是说明建筑施工单位加强建筑施工技术管理的重要性,以供参考。     

中、日、欧的被试者对河川景观注视过程的比较研究

在景观认知·评价过程中,如果把眼球运动作为反映大脑所进行的视觉情报处理过程的外部参数,那么眼的运动方式就可能因评价者的生活经验、知识水平甚至价值观和思维方式的不同而产生差异。因此,可以设想被试者的社会文化背景的差异也有可能会从他们对景观的认知方式上得到体现。作为视觉认知中异域文化差异的比较研究之一,运用眼球运动跟踪仪对评价者的景观认知评价过程进行了跟踪测试,并试图通过对认知过程中的注视点分布、注视点数以及注视点的停留时间和注视内容的变化趋势这几个角度的分析比较来探讨社会文化背景的差异如何体现在人类视觉情报信息的收集整理的外部反应中,从而明确在地域特色景观的保留和营造上构成要素的布局方式的意义。     

山西省古建筑消防安全工作存在的问题及对策

通过对专项治理发现的古建筑消防安全工作存在的问题的研究 ,提出了解决这些问题的建议     

TiB2 Powders Synthesis by Borothermal Reduction in TiO2 Under Vacuum

TiB₂ powders were synthesized by borothermal reduction in nanoscale TiO₂ with boron under vacuum. Reaction processes were investigated, and the effect of by‐product B₂O₃ was evaluated. Results showed that TiO₂ was firstly reduced by boron to form TiBO₃ and Ti₂O₃, and then to produce TiB₂ and B₂O₃ with increasing temperature. The reaction processes of TiB₂ powders synthesis included two‐step reduction in TiO₂ by boron and the removal of B₂O₃. The presence of B₂O₃, which was previously reported as the most important factor in promoting the coarsening of ZrB₂ and HfB₂ powders by borothermal reduction, did not lead to significant coarsening of TiB₂ powders. Due to the minor effect of B₂O₃, TiB₂ powders with small particle size and low oxygen content could be prepared by direct heat treatment of TiO₂ and boron at 1550°C under vacuum for 1 h. The particle size and oxygen content of synthesized TiB₂ powders were ~0.9 μm and ~1.7 wt%, respectively.     

Efficient Catalyst for Both Suzuki and Heck Cross‐Coupling Reactions: Synthesis and Catalytic Behaviour of Geometry‐ Constrained Iminopyridylpalladium Chlorides

A series of geometry‐constrained iminopyridyl‐palladium chlorides were synthesized and characterized. These phosphine‐free palladium complexes were explored for their catalytic activities in both Suzuki and Heck cross‐coupling reactions, achieving turnover numbers as high as 10⁶ towards various aryl bromides, even those containing various functionalities. In addition, the influence of substituents with steric and electronic factors was reflected by the differences observed in their activities.

     

Enantioselective One‐Pot Reaction: Organocatalyzed Synthesis of Fully Functionalized Oxabicyclo[2.2.2]octanes with Seven Contiguous Stereocenters

An enantioselective one‐pot Michael/Michael/Henry/hemiacetalization reaction between α,β‐unsaturated aldehydes, α‐ketoamides, and nitroalkenes under mild conditions catalyzed by a diarylprolinol silyl ether has been developed. The sequential methodology provides a direct approach to a wide range of fully substituted chiral oxabicyclo[2.2.2]octanes with seven contiguous stereocenters in moderate to excellent yields (up to 99%), high to excellent diastereoselectivities (up to >25:1 dr), and high to excellent enantioselectivities (up to 99% ee).