检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

趋磁性细菌多目标优化算法

控制与决策 2016年第5期31卷 829-834页

作者：徐志丹哈尔滨商业大学基础科学学院哈尔滨150028

提出趋磁性细菌多目标优化算法(MTBMO).该算法以趋磁性细菌优化算法(MBOA)中磁小体(MTSs)的生成机制为基础,设计适用于多目标优化的新型MTSs磁矩调节机制,确保群体的收敛性;同时采用基于混沌变异的替换方法取代MBOA中的磁小体替换机制... 详细信息

提出趋磁性细菌多目标优化算法(MTBMO).该算法以趋磁性细菌优化算法(MBOA)中磁小体(MTSs)的生成机制为基础,设计适用于多目标优化的新型MTSs磁矩调节机制,确保群体的收敛性;同时采用基于混沌变异的替换方法取代MBOA中的磁小体替换机制来增强群体的多样性.通过标准函数测试和与现有多目标优化算法的比较表明,MTBMO对于求解多目标优化问题(MOPs)是可行且有效的.

关键词：趋磁性细菌优化算法磁小体磁矩调节机制混沌变异多目标优化问题

Interface Microstructure of Al-Fe Tubes Joint by Magnetic Pulse Welding

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2012年第S1期19卷 442-445页

作者： xu zhi-dan YU Hai-ping LI Chun-feng HAN Yu-jie National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology The Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology

Magnetic Pulse Welding(MPW)is a very high speed process which produces solid-state *** this work, Welding interface microstructure of Al/Fe tubes by MPW and its influence factors were *** equipment with a capacitor of 100 μF was used under different voltages range from 8 kV to 15 *** and TEM observation were carried out to investigate microstructure of the welding *** results show that the dissimilar tubes(Al/Fe)could be welded with the optimum tapered angle of about 4 *** welding interface in Al/Fe joints exhibits a characteristic wavy morphology with wavelength of about I00 μm.A new layer exists between base tubes consisting of AI and Fe *** grained microstructure is founded near the welding *** results obtain in this work provide the fundamentals for the investigation of MPW mechanism of dissimilar tubes.

关键词： magnetic pulse welding dissimilar material ultrafine grained microstructure

Constructing 2D bismuth-based heterostructure for highly efficient photocatalytic CO2 reduction

在线全文

学校读者我要写书评

暂无评论

Tungsten 2025年第1期7卷 71-79页

作者： Ruo-Hang xu Hao-Yu Jiang dan-dan Cui Kun-Rong Du Hong-Run Zhang Sheng-Jie xu Ya-Qi Li zhi-Zhen Ren Liang Wang Wei-Chang Hao Yi Du School of Physics and BUAA-UOW Joint Research Centre Beihang University Shenzhen Institute of Beihang University Centre for Catalysis and Clean Energy School of Environment and Science Griffith University

Reforming carbon dioxide（CO2） into fuels and valuable chemicals using solar energy holds significant potential for emission reduction and addressing energy supply *** recombination of photocarriers remains a major obstacle,however,to enhancing solar energy conversion efficiency in the photocatalytic reaction *** two-dimensional materials,constructing heterogeneous structures has emerged as an effective strategy to enhance the separation of photoexcited carriers by leveraging the internal electric field at the heterogeneous ***,we present a facile strategy for preparing Bi4NbO8Br/Bi2WO6plate-on-plate Z-scheme junctions with a strong internal electric field by in situ *** unique heterostructure facilitates efficient separation and transport of photoexcited charges by harnessing the internal electric field induced by chemical bonding at the lateral ***,the Bi4NbO8Br/Bi2WO6heterostructure exhibits enhanced CO2photoreduction properties,along with a CO yield rate of approximately 35 μmol·g-1·h-1under full light *** work offers novel insights into the synthesis of unique hetero structures intended to enhance the efficiency of photocatalytic CO2reduction.

关键词： Bi4NbO8Br/Bi2WO6 CO2 reduction Heterostructures Photocatalysts

Quantile-based optimization under uncertainties for complex engineering structures using an active learning basis-adaptive PC-Kriging model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2025年第1期38卷 340-352页

作者： Yulian GONG Jianguo ZHANG dan xu Ying HUANG School of Reliability and Systems Engineering Beihang UniversityBeijing 100191China

The Reliability-Based Design Optimization(RBDO)of complex engineering structures considering uncertainties has problems of being high-dimensional,highly nonlinear,and timeconsuming,which requires a significant amount of sampling simulation *** this paper,a basis-adaptive Polynomial Chaos(PC)-Kriging surrogate model is proposed,in order to relieve the computational burden and enhance the predictive accuracy of a *** active learning basis-adaptive PC-Kriging model is combined with a quantile-based RBDO ***,five engineering cases have been implemented,including a benchmark RBDO problem,three high-dimensional explicit problems,and a high-dimensional implicit *** with Support Vector Regression(SVR),Kriging,and polynomial chaos expansion models,results show that the proposed basis-adaptive PC-Kriging model is more accurate and efficient for RBDO problems of complex engineering structures.

关键词： Reliability-based design optimization Quantile-based Basis-adaptive PC-Kriging Complex engineering structures Active learning Uncertainty

Organic solvent nanofiltration membranes for separation in non-polar solvent system

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2025年第2期10卷 244-267页

作者： Shuyun Gu Siyao Li zhi xu State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and Technology130 Meilong RoadShanghai200237China

Membrane technology holds significant potential for augmenting or partially substituting conventional separation techniques,such as heatdriven distillation,thereby reducing energy *** solvent nanofiltration represents an advanced membrane separation technology capable of discerning molecules within a molecular weight range of approximately 100-1000 Da in organic solvents,offering low energy requirements and minimal carbon *** separation in non-polar solvent system,such as toluene,n-hexane,and n-heptane,has gained paramount importance due to their extensive use in the pharmaceutical,biochemical,and petrochemical *** this review,we presented recent advancements in membrane materials,membrane fabrication techniques and their promising applications for separation in nonpolar solvent system,encompassing hydrocarbon separation,bioactive molecule purification and organic solvent ***,this review highlighted the challenges and opportunities associated with membrane scale-up strategies and the direct translation of this promising technology into industrial applications.

关键词： Organic solvent nanofiltration Membranes Membrane separation Non-polar solvent system Petrochemical and pharmaceutical application

Quantitative analysis of influencing factors to aerosol pH and its responses to PM_(2.5)and O_(3)pollution in a coastal city

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2025年第5期151卷 284-297页

作者： Ke xu Liqian Yin Qiaoling Chen dan Liao Xiaoting Ji Keran Zhang Yu Wu Lingling xu Mengren Li Xiaolong Fan Fuwang Zhang zhi Huang Jinsheng Chen Youwei Hong Center for Excellence in Regional Atmospheric Environment Key Lab of Urban Environment and HealthInstitute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China School of Life Sciences Hebei UniversityBaoding 071000China University of Chinese Academy of Sciences Beijing 100049China College of Resources and Environment Fujian Agriculture and Forest UniversityFuzhou 350002China College of Chemical Engineering Huaqiao UniversityXiamen 361021China College of Environment and Public Health Xiamen Huaxia UniversityXiamen 361024China Fujian Key Laboratory of Atmospheric Ozone Pollution Prevention Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Environmental Monitoring Center of Fujian Fuzhou 350003China Xiamen Institute of Environmental Science Xiamen 361021China

Aerosol acidity(pH)plays an important role in the multiphase chemical processes of atmospheric *** this study,we demonstrated the seasonal trends of aerosol pH calculated with the ISORROPIA-II model in a coastal city of southeast *** performed quantitative analysis on the various influencing factors on aerosol pH,and explored the responses of aerosol pH to different PM_(2.5)and O_(3)pollution *** results showed that the average aerosol pH was 2.92±0.61,following the order of winter>spring>summer>*** tests revealed that SO_(4)^(2−),NH_(x),T and RH triggered the variations of aerosol *** analysis results showed that T(37.9%-51.2%)was the main factors affecting pH variations in four seasons,followed by SO_(4)^(2−)(6.1%-23.7%),NH_(x)(7.2%-22.2%)and RH(0–14.2%).Totally,annual mean meteorological factors(52.9%)and chemical compositions(41.3%)commonly contributed the aerosolpH in the coastal *** concentrations of PM_(2.5)was positively correlated with aerosol liquid water content(R^(2)=0.53)and aerosol pH(R^(2)=0.26),indicating that the increase in pH was related with the elevated NH_(4)NO_(3)and decreased SO_(4)^(2−),and also the changes of T and *** O_(x)(O_(3)+NO_(2))was moderately correlated with aerosol pH(R^(2)=-0.48),attributable to the fact that the proportion of SO_(4)^(2−)increased under high T and low RH *** study strengthened our understanding of the contributions of influencing factors to aerosol pH,and also provided scientific evidences for chemical processes of atmospheric particles in coastal areas.

关键词： Aerosol acidity Aerosol liquid water Fine particular matter(PM_(2.5)) Ozone(O_(3)) Coastal city

Superhydrophobic and corrosion-resistant siloxane-modified MgAl-LDHs coatings on magnesium alloy prepared under mild conditions

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 450-463页

作者： Wenxi Zhang Zhangzelong Zhuo dan xu Liang Wu zhihui Xie Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China College of Materials Science and Engineering/National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

We have developed a superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating on the surface of Mg *** composite comprised a tungstate-intercalated(LDH-W)underlayer that was grown at low temperature(relative to hydrothermal reaction conditions)under atmospheric pressure and an outer polysiloxane layer created from a solution containing perfluorodecyltrimethoxysilane(PFDTMS)using a simple immersion *** successful intercalation of tungstate into the LDH phase and the following formation of the polysiloxane layer were confirmed through X-ray diffraction(XRD),Fourier transform infrared(FTIR)spectroscopy,and X-ray photoelectron spectroscopy(XPS).The corrosion resistance of the LDH-W film,both before and after the PFDTMS modification,was evaluated using electrochemical impedance spectroscopy(EIS),Tafel curves,and immersion *** results showed that Mg coated with LDH-W/PFDTMS exhibited significantly enhanced corrosion protection compared to the unmodified LDHW film,with no apparent signs of corrosion after exposure to 3.5wt%NaCl solution for 15 ***,the LDH-W/PFDTMS coating demonstrated superior superhydrophobicity and self-cleaning properties against water and several common beverages,as confirmed by static contact angle and water-repellency *** results offer valuable insights into preparing superhydrophobic and corrosion-resistant LDH-based composite coatings on Mg alloy surfaces under relatively mild reaction conditions.

关键词： Mg alloy corrosion coating layered double hydroxide

Wind Turbine Composite Blades:A Critical Review of Aeroelastic Modeling and Vibration Control

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2025年第1期21卷 1-36页

作者： Tingrui Liu Qinghu Cui dan xu College of Mechanical&Electronic Engineering Shandong University of Science&TechnologyQingdao266590China School of Mechanical&Automotive Engineering Liaocheng UniversityLiaocheng252059China

With the gradual increase in the size and flexibility of composite blades in large wind turbines,problems related toaeroelastic instability and blade vibration are becoming increasingly more *** their impact on thelifespan of wind turbines,these subjects have become important topics in turbine blade *** this article,firstaspects related to the aeroelastic(structural and aerodynamic)modeling of large wind turbine blades are ***,two main methods for blade vibration control are outlined(passive control and active control),including the case of composite *** improvement schemes are proposed accordingly,with a specialfocus on the industry’s outstanding suppression scheme for stall-induced nonlinear flutter and a new high-frequencymicro-vibration control ***,future research directions are indicated based on existingresearch.

关键词： Aeroelastic instability vibration control composite blade stall-induced nonlinear flutter high-frequency microvibration

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

生物地理信息优化算法中迁移算子的改进

模式识别与人工智能 2012年第3期25卷 544-549页

作者：徐志丹莫宏伟哈尔滨工程大学自动化学院哈尔滨150001 哈尔滨商业大学基础科学学院哈尔滨150028

原生物地理信息优化算法主要通过迁移算子与变异算子实现群体的进化,常被应用于求解单目标优化问题.如果将原有的进化算子直接用于求解连续多目标优化问题,会严重影响群体的多样性.文中将原迁移算子进行改进,引入扰动因子,增强群体的多... 详细信息

原生物地理信息优化算法主要通过迁移算子与变异算子实现群体的进化,常被应用于求解单目标优化问题.如果将原有的进化算子直接用于求解连续多目标优化问题,会严重影响群体的多样性.文中将原迁移算子进行改进,引入扰动因子,增强群体的多样性.并以此为基础,提出基于生物地理信息的多目标进化算法(BBMOEA).通过与原有迁移算子下的算法比较及各类型测试函数的实验,结果验证改进迁移算子对于求解多目标优化问题是有效可行的.同时将BBMOEA与经典算法SPEA2和NSGA-Ⅱ进行比较,结果表明BBMOEA所得Pareto解集在收敛的同时,具有较均匀的分布性.

关键词：生物地理信息算法(BBO) 多目标优化问题 Pareto最优解集