载体和助剂对CO气相合成草酸二甲酯的影响

采用XRD、BET等手段,考察Pd-Al2O3催化剂载体晶型和助剂种类对CO气相偶联合成草酸二甲酯的影响。结果表明,以α-Al2O3为催化剂载体,以La为助剂,草酸二甲酯的空时收率达到0.53 g/mL.h,CO转化率达到70%。     

载体对非晶态Ni—B、Ni—P合金催化剂性能的影响

介绍了非晶态合金中具有代表性的Ni-B、Ni-P合金催化剂的结构特点,比较了Al2O3、SiO2、天然粘土、CNTs等载体对催化剂热稳定性能和催化性能的影响。     

Heterogeneous Catalytic Ozonation with Supported Titanium Dioxide in Model and Natural Waters

This paper presents the results obtained with heterogeneous catalytic ozonation in which model and natural waters are ozonated in the presence of supported titanium dioxide (TiC₂) as a solid catalyst. The conditions in preparing the supported catalyst are experimentally optimized. The efficiencies of three catalyst supports (attapulgyte, alumina and silica gel) for organic matter oxidation have been compared. The TiC₂ supported in alumina calcined at 500[ddot]C compacted to granular form with a particle diameter about 2-4 mm is demonstrated to be the best catalyst on the removal total organic carbon (TOC) by ozone.     

核电站冷却剂系统测温旁路支吊架失效原因分析及解决措施

采用Bentley AutoPIPE软件对在役检查经常出现支吊架失效的核电站冷却剂系统测温旁路管线进行静态分析。结果表明:弹簧吊架热态失载是由于主管道实际热位移偏离设计值,弹簧选型余量不足引起的。通过对弹簧吊架重新选型,其热态位移量在量程范围内,载荷变化率符合设计要求,且更改后的测温旁路一次应力、二次应力均符合规范要求。在随后的机组大修检查中,该条管线未再出现弹簧失效故障。     

对话 共生 载体——中国地质大学（武汉） 逸夫博物馆设计

该文通过对中国地质大学（武汉）逸夫博物馆设计的介绍,探讨了在特定的城市人文环境和承载主题下的博物馆建筑的设计思路。     

Vibration of initially stressed beam with discretely spaced multiple elastic supports

Vibration behavior of an initially stressed beam on discretely spaced multiple elastic supports has been studied and a theoretical formulation of the system is derived using the variational principle. Unlike beams on an elastic foundation, discretely spaced supports can distort the beam mode shapes when the supports have rather large stiffness, i.e. usually expected beam modes cannot be obtained, but rather irregular mode shapes are observed. Conversely, irregular modes can be recovered by changing initial stress. Since support location is closely associated with the dynamic characteristics, this work also discusses eigenvalue sensitivity with respect to the support position and some numerical examples are investigated to illustrate the above findings.     

Lessons Learned for Ground Movements and Soil Stabilization from the Boston Central Artery

This paper summarizes lessons learned about soil stabilization with the deep mixing method (DMM) as it was developed and applied over 10 years during construction of the Boston Central Artery and Tunnel (CA/T). It also summarizes lessons about the control of excavation-induced ground movements and their characteristics. Deep deposits of marine clay were stabilized with DMM for large open cuts at Bird Island Flats and Fort Point Channel, both of which are described with respect to site conditions, soil properties, DMM installation and characteristics, and measured field performance. Topics addressed in this paper include water pressure distribution behind DMM walls, statistical characterization of soil cement properties, quality control/quality assurance procedures, comparison of measured and numerically simulated deformation in clay stabilized with various configurations of soil cement elements, shear modulus degradation characteristics of in situ soil cement, and ground movement patterns. Recommendations are made for soil cement properties, installation procedures, analytical modeling, design, and inspection.     

Design and synthesis of nanostructured catalysts

Advanced catalysts have been designed in the forms of nanocrystalline and nanoporous materials. These nanostructured catalysts are derived with superior control in crystallite size, pore structure, pore size, surface area, compositional flexibility, and component dispersion. They are tailored with excellent activity, selectivity and stability for a wide variety of catalytic reactions.     

Generalized Ideals and Supports in Pseudo Effect Algebras

In this paper we introduce the definitions of generalized ideals and generalized filters in pseudo effect algebras. From the generalized ideals (filters), we obtain some equivalent characterization of ideals (filters). The relationships among generalized ideals, ideals and local ideals are studied in detail. We also establish an isomorphism between the set of supports and the set of generalized ideals of pseudo effect algebras.     

基于BIM的管道支吊架辅助布置系统

基于BIM开发研究了管道系统支吊架的辅助布置系统,系统以通用BIM软件REVIT为平台,通过二次开发,创建了各类支吊架模型库,在管道设计图模型上直接添加支吊架模型,将管道支吊架安全复核与三维实体布置结合,精准确定支吊架位置并直观显现,提高了施工的精细度。同时提供了物料统计功能,为设计方案的比选和优化提供了便利。