摘要：Heterogeneous molecular catalysts,such as metal phthalocyanines,are efficient electrocatalysts for CO_(2) reduction reaction(CO_(2)RR).However,the rational design and synthesis of a molecular catalyst-based heterostructure for CO_(2)RR remains ***,we developed a crystalline bimetallic phthalocyanine heterostructure electrocatalyst(CoPc/FePc HS),which achieved an excellent CO_(2)-to-CO conversion efficiency(99%)and outstanding long-term stability after 10 h of *** functional theory calculations revealed that the enhancement of CO_(2)RR performance could be attributed to the distinct electron transfer pattern between FePc and *** heterostructural engineering in molecular catalysts would inspire a unique approach for improving CO_(2)RR performance.

摘要：Wave transmission and overtopping around nearshore breakwaters can have significant influence on the transmitted wave parameters,which affects wave conditions and sediment transportation and becomes the focus of design in *** objective of this paper is to present a simplified model to estimate these important wave *** paper describes the incorporation of wave transmission and overtopping module into a wave model for multi-directional random wave transformation based on energy balance equation with the consideration of wave shoaling,refraction,diffraction,reflection and ***'s frequency spectrum and non-linear dispersion relation are also included in this *** influence of wave parameters of transmitted waves through a smooth submerged breakwater has been considered in this model with an improved description of the transmitted wave spectrum of van der Meer et al.(2000) by Carevic et al.(2013).This improved wave model has been validated through available laboratory *** the verified model is applied to investigate the effect of wave transmission and overtopping on wave heights behind low-crested breakwaters in a project for nearshore *** calculations are carried out with and without consideration of the wave transmission and overtopping,and comparison of them indicates that there is a considerable difference in wave height and thus it is important to include wave transmission and overtopping in modelling nearshore wave field with the presence of low-crested ***,this model can provide a general estimate of the desired wave field parameters,which is adequate for engineers at the preliminary design stage of low-crested breakwaters.

摘要：光催化析氢(PHE)技术是解决当前能源短缺问题的有力途径之一.本文采用简单的油浴加热方法原位合成了六方空心管状氮掺杂碳包覆的In_(2)O_(3)/CdZnS异质结光催化剂.结果表明,N-C/In_(2)O_(3)/CdZnS(~22.87μmol h-1)的光催化析氢速率是原始CdZnS(~9.49μmol h-1)的~2.4倍,是原始In_(2)O_(3)(~0.42μmol h-1)的~54.5倍.经过4个循环后,光催化析氢量仍能达到原来的90%以上.其优异的光催化性能主要归功于以下几个方面:(1)氮掺杂碳层作为电子传输桥梁,保证了光催化反应的高效电子转移;(2)中空管状结构增强了光的反射,增强了光吸收性能;(3)形成N-C/In_(2)O_(3)/CdZnS异质结构,改善了载流子复合和光腐蚀问题;(4)大的比表面积和介孔结构提供了大量的反应位点.因此,本研究为设计可见光型异质结催化剂提供了新思路.

摘要：In order to study the failure process of an anchorage structure and the evolution law of the body＇s defor- mation field, anchor push-out tests were carried out based on digital speckle correlation methods （DSCM）. The stress distribution of the anchorage interface was investigated using the particle flow numerical simulation method. The results indicate that there are three stages in the deformation and fail- ure process of an anchorage structure： elastic bonding stage, a de-bonding stage and a failure stage. The stress distribution in the interface controls the stability of the structure. In the elastic bonding stage, the shear stress peak point of the interface is close to the loading end, and the displacement field gradually develops into a ＂V＂ shape, in the de-bonding stage, there is a shear stress plateau in the center of the anchorage section, and shear strain localization begins to form in the deformation field. In the failure stage, the bonding of the interface fails rapidly and the shear stress peak point moves to the anchorage free end. The anchorage structure moves integrally along the macro-cracl~ The de-bonding stage is a research focus in the deformation and failure process of an anchorage structure, and plays an important guiding role in roadway support design and prediction of the stability of the surrounding rock.

摘要：Antibacterial nanoagents with broad-spectrum antibacterial activities have emerged as an evolution of ***,their bacteria-capturing capability and bacteria-killing efficiency remain insufficient for commercial *** by the hunting behavior of spiders,here,a novel spiderweb-like nanoagent based on silver-adenine nanowires is designed to achieve high-efficiency capture and killing of *** virtue of the initiative bacteriacapturing functionality,this spiderweb-like nanoagent could effectively attract and trap bacteria through electrostatic interaction and its reticular morphology ***,its synergetic antibacterial mechanism combining physical membranolysis with reactive oxygen species(ROS)release allows such nanoagent to harvest a promoted bactericidal ***,the woundplast employing the spiderweblike nanoagent exhibits a superior antibacterial efficacy against drug-resistant Gram-negative Escherichia coli and Gram-positive methicillin-resistant Staphylococcus aureus compared with commercially available *** work may pave a new way for rational design of new generation bactericidal agents facing the future super-bacteria booming.

摘要：This paper considers a single server retrial queue in which a state-dependent service policy is adopted to control the service rate. Customers arrive in the system according to a Poisson process and the service times and inter-retrial times are all exponentially distributed. If the number of customers in orbit is equal to or less than a certain threshold, the service rate is set in a low value and it also can be switched to a high value once this number exceeds the threshold. The stationary distribution and two performance measures are obtained through the partial generating functions. It is shown that this state-dependent service policy degenerates into a classic retrial queueing system without control policy under some conditions. In order to achieve the social optimal strategies, a new reward-cost function is established and the global numerical solutions, obtained by Canonical Particle Swarm Optimization algorithm, demonstrate that the managers can get more benefits if applying this state-dependent service policy compared with the classic model.

摘要：In actual production,deep coal mine roadways are often under typical static-dynamic coupling stress(SDCS)conditions with high ground stress and strong dynamic *** the increasing number of disasters and accidents induced by SDCS conditions,the safe and efficient production of coal mines is seriously ***,it is of great practical significance to study the deformation and failure characteristics of the roadway surrounding rock under *** this paper,the effects of different in-situ stress fields and dynamic load conditions on the surrounding rock are studied by numerical simulations,and the deformation and failure characteristics are *** to the simulation results,the horizontal stress,vertical stress and dynamic disturbance have a positive correlation with the plastic failure of the surrounding *** these factors,the influence of the dynamic disturbance is the most *** the same stress conditions,the extents of deformation and plastic failure of the roof and ribs are always greater than those of the *** effect of horizontal stresses on the roadway deformation is more notable than that of vertical *** results indicate that for the roadway under high-stress conditions,the in-situ stress test must be strengthened *** determining the magnitude of the in-situ stress,the location of the roadway should be reasonably arranged in the design to optimize the mining *** roadways that are strongly disturbed by dynamic loads,rock supports(rebar/cable bolts,steel set etc.)that are capable of maintaining their effectiveness without failure after certain dynamic loads are *** results of this study contribute to understanding the characteristics of the roadway deformation and failure under SDCS,and can be used to provide a basis for the support design and optimization under similar geological and geotechnical circumstances.

摘要：Although graphite anodes operated with representative de/intercalation patterns at low potentials are considered highly desirable for K-ion batteries,the severe capacity fading caused by consecutive reduction reactions on the aggressively reactive surface is inevitable given the scarcity of effective protecting ***,by introducing a flame-retardant localized high-concentration electrolyte with retentive solvation configuration and relatively weakened anion-coordination and non-solvating fluorinated ether,the rational solid electrolyte interphase characterized by well-balanced inorganic/organic components is tailored in *** effectively prevented solvents from excessively decomposing and simultaneously improved the resistance against K-ion ***,the graphite anode retained a prolonged cycling capability of up to 1400 cycles(245 mA h g,remaining above 12 mon)with an excellent capacity retention of as high as 92.4%.This is superior to those of conventional and high-concentration ***,the optimized electrolyte with moderate salt concentration is perfectly compatible with graphite,providing a potential application prospect for K-storage evolution.

摘要：The concave die design of self-pierce riveting(SPR) is of critical importance for product quality. The optimization of concave die parameters based on orthogonal test is proposed to explore the relationship between self-pierce riveted joint quality and die parameters. There are nine independent die parameter factors in orthogonal test and each factor has 4 levels. In order to evaluate the interlock and neck thickness, we carry out numerical simulations by the software DEFORM-2D. Then, the primary and secondary factors that affect the joint quality have been found out by means of range analysis. Finally, an optimization scheme is brought forward to design concave die in SPR process, which indicates that the joint has higher quality than that of former orthogonal *** work can be extended by a detailed mechanical and fatigue analysis for the joint quality of SPR process.

摘要：Under given heat duty and heat transfer area conditions, the equipartition of the entransy dissipation (EoED) principle, the equipartition of the temperature difference (EoTD) principle, and the equipartition of the heat flux (EoHF) principle are applied to the optimization design of a heat exchanger with a variable heat transfer coefficient. The results show that the difference between the results obtained using the EoED and EoTD principles is very small, far smaller than that between the results obtained using the EoED and EoHF principles. The correct entransy dissipation minimization principle is chosen to optimize the parameters in the hot and cold fluids in a two-fluid heat exchanger, under given heat duty and heat transfer area conditions. The results indicate that the proper choice of the two alternative fluids has an important role in the successful application of the entransy dissipation minimization principle. The fluid that could improve the total heat transfer coefficient should be chosen, or the fluid that makes the temperature profiles of the hot and cold fluids parallel and decreases the temperature difference between the hot and cold fluids after optimization simultaneously, could be the proper one.