摘要：Fast electron-hole recombination issues during titanium dioxide(TiO_(2))photocatalysis limit its application in preventing bacterial infection during bone defect *** this study,TiO_(2)@reduced graphene oxide(rGO)composites were synthesized using a hydrothermal method in which rGO,which possesses very high electrical conductivity,promotes the separation of photoelectron-hole pairs of TiO_(2),thus improving the efficiency of photocatalytic production of reactive oxygen species(ROS).Subsequently,TiO_(2)@rGO composites were introduced into poly-L-lactic acid(PLLA)to prepare bone scaffolds with photocatalytic antibacterial function via selective laser *** results showed that TiO_(2)grew on the surface of rGO and formed a covalent bond connection(Ti-O-C)with rGO.A decreased electrochemical impedance of TiO_(2)@rGO composites was observed,and the transient photocurrent intensity increased from 0.05 to 0.5μA/cm^(2).Analysis of electron spin resonance found that the photocatalytic products of TiO_(2)were·OH and·O^(2-),two kinds of ROS capable of killing bacteria via disrupting the structure of the bacterial membrane in *** experiments showed that the PLLA/TiO_(2)@rGO scaffolds had good antibacterial properties against Escherichia coli and Staphylococcus ***,we report that these scaffolds exhibited both enhanced mechanical properties due to the addition of TiO_(2)@rGO as a reinforcement material and good biocompatibility during cell proliferation.

摘要：At present,seawater electrolysis powered by renewable energy stands as a crucial method for the industrial production of *** the abundance of seawater and its inherently high conductivity,seawater electrolysis earns an increasing ***,challenges remain,such as the competitive chloride oxidation reaction(COR)caused by chloride ions(Cl^(-))and the corrosion of active sites,which hinder the industrial seawater *** this review,we initially outline four design strategies aimed at avoiding the occurrence of COR:designing selective oxygen evolution reaction(OER)active sites,anti-corrosion strategies,small molecules oxidize reaction(SMOR)and adjusting ***,we compile approaches to enhance the OER selectivity and corrosion resistance in seawater electrolysis,including introducing anion buffer ***,we categorize reported OER catalysts based on their composition and summarize the mechanism underlying their high activity and *** conclusion,we address the future challenges and prospects of industrializing seawater electrolysis.

摘要：The continuous developing features in the design of mechanical product and based on 3D entity model is aimed at, and the extension of the 4-dimensional model with the process of designing, the knowledge described model on the level of semantic understanding and summarizing the designing process and the way of discovering knowledge from multi-information model are studied. On the basis of designing the broad sensed collaborative system, through discussion of the relationship between the implicit knowledge of the users and the designing knowledge as well as commanding all the designing links, taking advantage of the way of concluding and deducting in the concept of the designers, the synthetic knowledge unit formed in the dynamic process from the conception design t9 the last design is schemed out, and the knowledge discovered principle in the dynamic designing process of the mechanical products and the key technology in its implementation under the milieu of network is brought forward.

摘要：A kind of closed-loop Hall effect sensor is designed and fabricated by considering several factors such as iron core material, Hall device, as well as selected integrated circuit. Through studying the effect of the iron material and structures of current sensor, a kind of optimal Hall effect current sensor is found. The experimental results show that the presented closed-loop Hall effect current sensor achieves 1 mA/A sensitivity. And its lineafity and accuracy are 0.1% and 0.35% FS, respectively, at cur- rents ranging from 0 to 50 A.

摘要：Bacterial infection is a major problem following bone implant ***,poly-l-lactic acid/carbon nanotube/hydroxyapatite(PLLA/CNT/HAP)bone scaffolds possess enhanced mechanical properties and show good ***,wesynthesizedsilver(Ag)-dopedCNT/HAP(CNT/Ag-HAP)nanohybrids via the partial replacing of calcium ions(Ca2+)in the HAP lattice with silver ions(Ag+)using an ion doping technique under hydrothermal ***fically,the doping process was induced using the special lattice structure of HAP and the abundant surface oxygenic functional groups of CNT,and involved the partial replacement of Ca2+in the HAP lattice by doped Ag+as well as the in situ synthesis of Ag-HAP nanoparticles on CNT in a hydrothermal *** result-ing CNT/Ag-HAP nanohybrids were then introduced into a PLLA matrix via laser-based powder bed fusion(PBF-LB)to fabricate PLLA/CNT/Ag-HAP scaffolds that showed sustained antibacterial *** then found that Ag+,which pos-sesses broad-spectrum antibacterial activity,endowed PLLA/CNT/Ag-HAP scaffolds with this activity,with an antibacterial effectiveness of 92.65%.This antibacterial effect is due to the powerful effect of Ag+against bacterial structure and genetic material,as well as the physical destruction of bacterial structures due to the sharp edge structure of *** addition,the scaffold possessed enhanced mechanical properties,showing tensile and compressive strengths of 8.49 MPa and 19.72 MPa,***,the scaffold also exhibited good bioactivity and cytocompatibility,including the ability to form apatite layers and to promote the adhesion and proliferation of human osteoblast-like cells(MG63 cells).

摘要：Electrocatalytic nitrogen reduction reaction under ambient conditions is a promising pathway for ammonia *** nitrogen reduction reactions are carried out in N_(2)-saturated environments and use high-purity nitrogen as feedstock,which is ***,we prepared carbon-coated ultra-low 4d metal Ru-doped liquid metal Ga(Ru_(0.06)/LM@C)for NRR over a wide range of N_(2) *** analyses show that the introduction of the ultra-low 4d element Ru can effectively adjust the electronic structure through orbital interactions,thus enhancing the adsorption of nitrogen-containing *** liquid catalyst utilized its mobility to provide a higher density of active *** addition,the material Ru_(0.06)/Ga@C itself has the ability to promote product *** three act synergistically to optimize the N_(2) mass transfer path,thereby increasing the*NNH coverage and further improving the ammonia yield over a wide range of N_(2) *** maximum NH_(3) yield of the catalyst can reach 126.0μg h^(-1) mgcat^(-1)(at–0.3 V ***)with high purity N_(2) as feed gas,and the Faraday efficiency is 60.4%at–0.1 V *** a wide range of N_(2) concentrations,the NH_(3) yield of the catalyst was greater than 100μg h^(-1) mgcat^(-1) with a Faraday efficiency higher than 47%.The catalytic performance is much higher than that of solid Ga@C and reported p-block metal-based catalysts.

摘要：Renewable energy conversion as well as water electrolysis technologies are constrained by the fact that kinetics are always slow in the electrocatalytic oxygen evolution reaction(OER).There are numerous means and strategies for the enhancement of OER *** this paper,we systematically review the important role of anionic vacancies in enhancing the OER activity of catalysts:increasing catalyst conductivity,improving electrical conductivity,and enhancing intermediate *** order to better detect the presence of vacancies in the samples,the principle of vacancy detection is reviewed in detail in terms of both spectroscopic and microscopic characterization,and the methods of vacancy formation as well as the factors influencing the concentration of vacancies are summarized in *** addition,the challenges and new directions for the study of anionic vacancies are *** Wang was awarded a *** chemistry from Jilin University in 2006 under the supervision of *** *** worked as a Postdoctoral Scholar in Shandong University,the State Key Laboratory of Crystal Materials from 2008 to *** is currently a professor at Qingdao University of science and *** research interests mainly focus on the design and synthesis of functional organic-inorganic hybrids and porous MOFs materials,as well as their applications in photocatalysis,electrocatalysis,lithium-ion battery,*** Chi received her *** and *** from the State Key Laboratory of Heavy Oil Processing,China University of Petroleum(East China).She is currently an associate professor at Qing dao University of science and *** research interests focus on the design and synthesis of transition metal-based nanostructures and porous MOFs materials for electrochemical applications.

摘要：In recent years, glass fiber reinforced plastics (GFRP) are being extensively used in variety of engineering applications in many different fields such as aerospace, oil, gas and process industries. However, the users of FRP are facing difficulties to machine it, because of fiber delamination, fiber pull out, short tool life, matrix debonding, burning and formation of powder like chips. The present investigation focuses on the optimization of machining parameters for surface roughness of glass fiber reinforced plastics (GFRP) using design of experiments (DoE). The machining parameters considered were speed, feed, depth of cut and workpiece (fiber orientation). An attempt was made to analyse the influence of factors and their interactions during machining. The results of the present study gives the optimal combination of machining parameters and this will help to improve the machining requirements of GFRP composites.

摘要：Parametric modeling of the impeller which drove a small wind device was built by knowledge fusion ***2410 airfoil blade was created by KF *** technology of UG/KF secondary development for the automatic modeling of wind turbine blade,the program can read in the airfoil data files automatically and the impeller model entity can be generated *** order to modify the model,the aerodynamic characteristics of the impeller were analyzed for getting aerodynamic parameters by *** maximum force torch and best parameters of impeller were calculated.A physical prototype impeller was manufactured and the correctness of the design was verified,and the error of force torch between simulation and experimental results is about 10%.Parameterization design of the impeller model greatly improves the efficiency of modeling and flexibility of the CAD system.

摘要：Energy consumption and acoustic noise can be significantly reduced through perching in the sustained flights of small Unmanned Aerial Vehicles(UAVs).However,the existing flying perching robots lack good adaptability or loading capacity in unstructured *** at solving these problems,a deformable UAV perching mechanism with strong adaptability and high loading capacity,which is inspired by the structure and movements of birds'feet,is presented in this *** elastic toes,an inverted crank slider mechanism used to realize the opening and closing movements,and a gear mechanism used to deform between two configurations are included in this *** experiments on its performance towards different objects,Results show that it can perch on various objects reliably,and its payload is more than 15 times its *** integrating it with a quadcopter,it can perch on different types of targets in outdoor environments,such as tree branches,cables,eaves,and spherical *** addition,the energy consumption of the UAV perching system when perching on objects can be reduced to 0.015 times that of hovering.