检索结果-南通市图书馆

Numerical analysis on shock-cylinder interaction using immersed boundary method

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2017年第9期60卷 1423-1432页

作者： luo Kun luo YuJuan JIN Tai FAN JianRen State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

The problem of shock interaction with a rigid circular cylinder has been investigated using a compressible immersed boundary method coupled with high-order weighted-essentially non-oscillatory(WENO) ***,the accuracy of the developed code is ***,influences of the incident shock Mach number on the flow-field structure and dynamic drag coefficient,as well as time evolution of the flow field are *** different shock Mach number,the flow structure shows very different *** a given dimensionless time,both the normalized shock detachment distance and the normalized vertical distance from the highest point of the primary reflected shock to the centerline of the cylinder decreases with increasing shock Mach ***,location of the upper triple point varies non-monotonically with shock Mach *** a case with given shock Mach number,the trajectory of the upper triple point and the time evolution of the normalized vertical distance from the highest point of the primary reflected shock to the centerline of the cylinder can both be predicted by linear ***,the time evolution of the normalized shock detachment distance is biased to be ***,time evolution of force exerted on the cylinder is quite unsteady for a case with given shock Mach number and given cylinder *** small shock Mach number,there exists a negative valley,and it disappears when the incident shock Mach number increases to a large value,e.g.,***,correlations to predict the occurrence of the peak drag and its value under different shock Mach numbers have been proposed.

关键词： shock-cylinder interaction immersed boundary method shock Mach number flow structure unsteady force

System deployment optimization in architecture design

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2014年第2期25卷 237-248页

作者： Xiaoxue Zhang Shu Tang Aimin luo Xueshan luo School of Information System and Management National University of Defense Technology

Optimization of architecture design has recently drawn research interest. System deployment optimization （SDO） refers to the process of optimizing systems that are being deployed to activi- ties. This paper first formulates a mathematical model to theorize and operationalize the SDO problem and then identifies optimal so- lutions to solve the SDO problem. In the solutions, the success rate of the combat task is maximized, whereas the execution time of the task and the cost of changes in the system structure are mini- mized. The presented optimized algorithm generates an optimal solution without the need to check the entire search space. A novel method is finally proposed based on the combination of heuristic method and genetic algorithm （HGA）, as well as the combination of heuristic method and particle swarm optimization （HPSO）. Experi- ment results show that the HPSO method generates solutions faster than particle swarm optimization （PSO） and genetic algo- rithm （GA） in terms of execution time and performs more efficiently than the heuristic method in terms of determining the best solution.

关键词： architecture design system deployment optimization,heuristic.

A Perspective on the Evolution of Atmospheric Blocking Theories:From Eddy-Mean flow Interaction to Nonlinear Multiscale Interaction

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2023年第4期40卷 553-569页

作者： Dehai luo Binhe luo Wenqi ZHANG Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of ScienceBeijing 100029China University of Chinese Academy of Sciences Beijing 101499China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100091China Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of ScienceBeijing 100029China

In this paper,we first review the research advancements in blocking dynamics and highlight the merits and drawbacks of the previous theories of atmospheric ***,the dynamical mechanisms of atmospheric blocking are presented based on a nonlinear multi-scale interaction(NMI)*** studies suggested that the eddy deformation(e.g.,eddy straining,wave breaking,and eddy merging)might lead to the formation and maintenance of atmospheric ***,the results were speculative and problematic because the previous studies,based on the time-mean eddy-mean flow interaction model,cannot identify the causal relationship between the evolution of atmospheric blocking and the eddy *** on the NMI model,we indicate that the onset,growth,maintenance,and decay of atmospheric blocking is mainly produced by the spatiotemporal evolution of pre-existing upstream synoptic-scale eddies,whereas the eddy deformation is a concomitant phenomenon of the blocking *** lifetime of blocking is mainly determined by the meridional background potential vorticity gradient(PVy)because a small PVyfavors weak energy dispersion and strong nonlinearity to sustain the *** the zonal movement of atmospheric blocking is associated with the background westerly wind,PVy,and the blocking *** this NMI model,a bridge from the climate change to sub-seasonal atmospheric blocking and weather extremes might be established via examining the effect of climate change on ***,it is expected that using the NMI model to explore the dynamics of atmospheric blocking and its change is a new direction in the future.

关键词： atmospheric blocking teleconnection patterns eddy deformation potential vorticity gradient climate change nonlinear multiscale interaction

42CrMoA地质钻杆接头调质裂纹形成原因分析

在线全文

学校读者我要写书评

暂无评论

煤矿机械 2025年第1期46卷 102-104页

作者：骆晓炜中煤科工西安研究院(集团)有限公司西安710077

通过对失效接头的化学成分、力学性能、金相和扫描电镜能谱分析等检测项目,对42CrMoA加工的地质钻杆接头失效原因进行了全面分析。分析结果表明,该失效为淬火裂纹引起,是由于原材料中碳化铬夹杂物的存在和基体组织不均匀导致钢材内部形... 详细信息

通过对失效接头的化学成分、力学性能、金相和扫描电镜能谱分析等检测项目,对42CrMoA加工的地质钻杆接头失效原因进行了全面分析。分析结果表明,该失效为淬火裂纹引起,是由于原材料中碳化铬夹杂物的存在和基体组织不均匀导致钢材内部形成应力集中点,破坏钢材的均匀性,进而引发淬火裂纹,裂纹顺着接头台肩处圆弧倒角应力集中点扩展,故形成了弧形和贯穿形复合裂纹。提出了降低此类失效发生的建议。

关键词： 42CrMoA 钻杆接头失效原因夹杂物组织不均匀

建筑厂房机电安装工程管线布置现状及优化路径

在线全文

学校读者我要写书评

暂无评论

山西建筑 2025年第1期51卷 94-98页

作者：罗崇发贵州航天建设工程有限公司贵州贵阳550000

为了优化建筑厂房机电安装工程管线布置,增强机电安装工程施工效率,文章探讨了建筑厂房机电安装工程管线布置现状,当前施工过程中存在前期规划不充分、管线碰撞、重复施工等问题,管线材料物流管理不畅,影响了布置效率与施工活动的顺利... 详细信息

为了优化建筑厂房机电安装工程管线布置,增强机电安装工程施工效率,文章探讨了建筑厂房机电安装工程管线布置现状,当前施工过程中存在前期规划不充分、管线碰撞、重复施工等问题,管线材料物流管理不畅,影响了布置效率与施工活动的顺利开展。为此提出建筑厂房机电安装工程管线布置的优化路径,要求科学选取交叉点位置,设置适宜的管线净高度,科学进行施工设计,加强管线分类管理,增强管线综合布置效果。以贵阳经开区产业集群某厂房项目为例,总结提高工程效率的策略与具体做法。该研究结果为工业厂房的高效管线布局提供了一定参考,以此促进建筑业资源的合理利用。

关键词：机电安装管线综合布置资源利用率协调机制

Mesh-supported V2O5-WO3/TiO2 nanosheet array catalysts for efficient removal of NOx

在线全文

学校读者我要写书评

暂无评论

Tungsten 2025年第1期 100-111页

作者： Zhi-Qi Zhang Liu Yang Wen luo Vladimir An Jing Li Bao-Dan Liu School of Materials Science and Engineering Northeastern University Foshan Graduate School of Innovation Northeastern University Kizhner Research Center School of Advanced Manufacturing Technologies Tomsk Polytechnic University

The design and synthesis of vanadium-based denitration catalysts with low-temperature activity pose significant challenges in the field of toxic gas *** this study,we have developed a novel approach to fabricate highly efficient V2O5-WO3/TiO2monolithic mesh catalysts for NOxreduction at low ***,TiO2nanosheets with strong adhesion and large surface area were grown on Ti mesh using plasma electrolytic oxidation technology and hydrothermal ***,super-small traces of WO3and V2O5active nano-species were subsequently deposited on TiO2nanosheets using the deposition-precipitation *** to traditional ceramic-based V2O5-WO3/TiO2catalysts,our V2O5-WO3/TiO2monolithic mesh catalyst exhibits superior mechanical performance,excellent thermal conductivity,lower pressure drop,higher utilization of active components,and stronger synergistic ***,the V2O5-WO3/TiO2monolithic mesh catalysts exhibited excellent low-temperature catalytic activity with 98% of NOxconversion at 220℃,and remarkable long-term SO2tolerance and water resistance in the selective catalytic reduction（SCR） of NOxwith *** SCR reaction of tiny V2O5and WO3active species supported on TiO2nanosheets directly demonstrated to follow the Eley-Rideal mechanism by in situ infrared spectra.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

公有云桌面在学校移动办公中的应用研究

办公自动化 2025年第1期30卷 123-125页

作者：罗志强曲靖财经学校曲靖655000

随着移动办公的普及,教育行业面临适应新技术的需求,以满足师生及家长对灵活、高效办公环境的期望。公有云桌面通过提供可随时随地访问的虚拟工作环境,不仅优化资源配置,还增强数据安全和协作效率。该技术支持多种终端接入,保障学校信... 详细信息

随着移动办公的普及,教育行业面临适应新技术的需求,以满足师生及家长对灵活、高效办公环境的期望。公有云桌面通过提供可随时随地访问的虚拟工作环境,不仅优化资源配置,还增强数据安全和协作效率。该技术支持多种终端接入,保障学校信息系统的持续可用性和教育资源的均等性。通过实证分析,探讨公有云桌面在学校移动办公中的应用效果,为教育行业的信息化转型提供理论与实践的支持。

关键词：公有云桌面移动办公教育信息化

Energy consumption simulations of rural residential buildings considering differences in energy use behavior among family members

在线全文

学校读者我要写书评

暂无评论

Building Simulation 2024年第8期17卷 1335-1358页

作者： Xi luo Lina Du School of Building Services Science and Engineering Xi'an University of Architecture and Technology(XAUAT)Xi'an 710055China State Key Laboratory of Green Building Xi'an 710055China

The“average occupant”methodology is widely used in energy consumption simulations of residential buildings;however,it fails to consider the differences in energy use behavior among family *** on a field survey on the Central Shaanxi Plain,to identify the energy use behavior patterns of typical families,a stochastic energy use behavior model considering differences in energy use behavior among family members was proposed,to improve the accuracy of energy consumption simulations of residential *** results indicated that the surveyed rural families could be classified into the following four types depending on specific energy use behavior patterns:families of one elderly couple,families of one middle-aged couple,families of one elderly couple and one child,and families of one couple and one ***,on typical summer days,the results of daily building energy consumption simulation obtained by the“average occupant”methodology were 25.39%and 28%lower than the simulation results obtained by the model proposed in this study for families of one elderly couple and families of one middle-aged couple,and 13.05%and 23.05%higher for families of one elderly couple and one child,and families of one couple and one *** typical winter days,for the four types of families,the results of daily building energy consumption simulation obtained by the“average occupant”methodology were 21.69%,10.84%,1.21%,and 8.39%lower than the simulation results obtained by the model proposed in this study,respectively.

关键词： typical energy use behavior pattern differences in occupant behavior building energy consumption simulation stochastic energy use behavior simulation

Training-based symbol detection with temporal convolutional neural network in single-polarized optical communication system

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

Digital Communications and Networks 2023年第4期9卷 920-930页

作者： Yingzhe luo Jianhao Hu National Key Laboratory of Science and Technology on Communications University of Electronic and Science Technology of ChinaChengdu611731China

In order to reduce the physical impairment caused by signal distortion,in this paper,we investigate symbol detection with Deep Learning(DL)methods to improve bit-error performance in the optical communication *** DL-based methods have been applied to such systems to improve bit-error *** to the speech-to-text method of automatic speech recognition,this paper proposes a signal-to-symbol method based on DL and designs a receiver for symbol detection on single-polarized optical communications *** realize this detection method,we propose a non-causal temporal convolutional network-assisted receiver to detect symbols directly from the baseband signal,which specifically integrates most modules of the ***,we adopt three training approaches for different signal-to-noise *** also apply a parametric rectified linear unit to enhance the noise robustness of the proposed *** to the simulation experiments,the biterror-rate performance of the proposed method is close to or even superior to that of the conventional receiver and better than the recurrent neural network-based receiver.

关键词： Deep learning Optical communications Symbol detection Temporal convolutional network