检索结果-南通市图书馆

Numerical Investigation into the Distributor Design in Radial Flow Adsorber

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

Advances in Applied Mathematics and Mechanics 2019年第6期11卷 1436-1460页

作者： Yongliang Chen Yao Li haiqing si Bing Wang Haibo Wang Yingying Shen Ziqiang Qin College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106JiangsuChina College of Civil Aviation and Flight Nanjing University of Aeronautics and AstronauticsNanjing 211106JiangsuChina

Air flow distribution in radial flow adsorber was numerically investigated using computational fluid dynamics(CFD)method,which was proved to be applicable to study the problem of non-uniform distribution in radial flow *** showed that the degree of non-uniformity was more serious in desorption process than that is adsorption ***,it was considered that the non-uniform distribution of flow in a radial flow adsorber was mainly manifested in the desorption *** design of distributor parameters can improve the flow distribution in ***,three different structures of distributor and the effect of breathing valve were *** revealed that truncated cone is more effective than tubular and conical distributors in flow *** inserting the truncated cone in central channel,desorption uniformity was increased by 6.56%and the breakthrough time of CO_(2)was extended from 564s to 1138s in the adsorption ***“dead zone”problem at the top of adsorber during the desorption process was solved by opening breathing valve,which prolonged the working life of adsorber and was proved to have less effect on the uniform of airflow.

关键词： CFD method air separation radial flow adsorber adsorption desorption

Numerical Investigation into the Air Flow Distributions of the Air Conditioning System in the Modular Data Center

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

Advances in Applied Mathematics and Mechanics 2019年第1期11卷 91-107页

作者： Hao Dong Ziqiang Qin Shicheng Liu Yao Li Yingying Shen Haibo Wang Yitong Zong XiaojunWu haiqing si College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China College of Civil Aviation and Flight Nanjing University of Aeronautics and AstronauticsNanjing 210016China China Aerodynamics Research and Development Center Mianyang 621000China

Data center plays an increasingly important role in everyday *** data center is becoming more and more powerful,energy consumption is also increasing *** air conditioning system occupies at least 50 percent of the total energy ***,delicate analysis on the air conditioning system could help to reduce energy consumption in data *** advanced Finite Volume Method with RNG k-ε model and convective heat exchange model is used in this paper to study the airflow and the temperature distribution of modular data center under different ***,the calculation formula of convective heat transfer coefficient for plate flow is adopted to simplify analysis;and fans on the back of racks are simplified to be walls with a certain pressure *** reveal that,in the case where air conditioners are arranged face-to-face,the temperature distribution on the back of racks is not uniform,and local high temperature points emerge near the side wall of air *** analyzing the distribution of air flow and temperature,geometric model is optimized by using a diagonal rack arrangement and drilling holes on the side *** the same energy consumption situation,the overall maximum temperature of the optimized model is reduced by 2.3℃ compared with that of the original one,and the maximum temperature on the server surface is reduced by 1℃.Based on the optimized model,the effect of the hot aisle distance on the temperature distribution is *** simulating four different cases with various distances of hot aisle of 100cm,120cm,130cm and 150cm,it is found that the temperature is generally lower and distributed more evenly in the case with 120cm hot aisle *** demonstrates that the distance of hot aisle has an effect on temperature.

关键词： Modular data center air conditioning temperature distribution hot/cold aisle CFD

Indispensable gutter layers in thin-film composite membranes for carbon capture

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

Green Energy & Environment 2024年第8期9卷 1220-1238页

作者： Gengyi Zhang haiqing Lin Department of Chemical and Biological Engineering University at Buffalo The State University at New York

Industrial thin-film composite(TFC) membranes achieve superior gas separation properties from high-performance selective layer materials,while the success of membrane technology relies on high-performance gutter layers to achieve production scalability and low-cost manufacturing. However, the current literature predominantly focuses on the design of polymer architectures to obtain high permeability and selectivity, while the art of fabricating gutter layers is usually safeguarded by industrial manufacturers and appears lackluster to academic researchers. This is the first report aiming to provide a comprehensive and critical review of state-of-the-art gutter layer materials and their design and modification to enable TFC membranes with superior separation performance. We first elucidate the importance of the gutter layer on membrane performance through modeling and experimental results. Then various gutter layer materials used to obtain high-performance composite membranes are critically reviewed, and the strategies to improve their compatibility with the selective layer are highlighted, such as oxygen plasma treatment, polydopamine deposition, and surface grafting. Finally, we present the opportunities of the gutter layer design for practical applications.

关键词： Thin-film composite membranes Gutter layer Gas separation Carbon capture

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

边界条件对三维空腔流动振荡的影响

南京航空航天大学学报 2006年第5期38卷 595-599页

作者：司海青王同光南京航空航天大学航空宇航学院南京210016

基于全隐式无分裂方法,数值求解三维非定常雷诺平均的N av ier-S tokes方程,紊流模型采用修正的B-L代数模型。运用此方法,本文数值模拟了三维开式空腔的超声速、跨声速、亚声速流动。研究了空腔口处剪切层的非定常运动现象,着重探讨了... 详细信息

基于全隐式无分裂方法,数值求解三维非定常雷诺平均的N av ier-S tokes方程,紊流模型采用修正的B-L代数模型。运用此方法,本文数值模拟了三维开式空腔的超声速、跨声速、亚声速流动。研究了空腔口处剪切层的非定常运动现象,着重探讨了入口边界条件对三维空腔流自持性振荡的影响。数值计算结果表明,与层流速度型相比,入口条件为紊流速度型和特征边界型得到的结果能够吻合。

关键词：非定常雷诺平均的N-S方程开式空腔流流动振荡边界条件

Micro-behavior Analysis of Pilots Based on Human-Aircraft-Environment Interaction

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2020年第1期37卷 70-82页

作者： si haiqing WANG Haibo PAN Ting LI Yao WU Xiaojun SHEN Yingying JIANG Naiqi School of Civil Aviation and Flight Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China Institute of Computational Aerodynamics China Aerodynamics Research and Development Center Mianyang 621000P.R.China

Micro-behavior of pilots is one of the most remarkable aspects in flight safety research *** study of pilot’s micro-behavior and its function are of great significance to enhance active safety warnings of flight and evaluation of flight *** on the cognitive process of pilots,this paper explores the meanings and contents of previous research on the pilot’s *** history and research status of pilot’s micro-behavior are briefly introduced from the perspective of their psychology,physiology and *** current reviews mainly include the pilot’s characteristic,multi-information fusion,integrated cognitive and humanization about controlling environment,*** several methods of these studies are discussed,and the mechanisms,experimental contents and applicable conditions of pilot’s physiological,psychological and physical characteristics are ***,the advantages and shortcomings of the existing research results are pointed out and *** with flight simulation experiment,the internal mechanism of pilot is ***,with the latest research in the modern flight field,and also from the specialization of application,the diversification of methodologies and the depth of investigation are provided,as well as the development trend of pilot’s micro-behavior analysis in the future.

关键词： flight safety micro-behavior active safety warning pilot flight simulation

Novel Method for Evaluating the Aging of Aviation Turbine Engine Oils via High-Temperature Bearing Deposit Tests

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2024年第1期26卷 67-77页

作者： Hao Lichun Yang He Song haiqing Zhou Yunfan He Jingjian Liang Yuxiang siNOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083

Aviation turbine engine oils require excellent thermal-oxidative stability because of their high-temperature ***-temperature bearing deposit testing is a mandatory method for measuring the thermal-oxidative performance of aviation lubricant oils,and the relevant apparatus was improved in the present *** different commercial aviation turbine engine oils were tested,one with standard performance(known as the SL oil)and the other with high thermal stability,and their thermal-oxidative stability characteristics were *** 100 h of high-temperature bearing testing,the SL oil was analyzed by using various analytical techniques to investigate its thermal-oxidative process in the bearing test,with its thermal-oxidative degradation mechanism also being *** results indicate that the developed high-temperature bearing apparatus easily meets the test requirements of method 3410.1 in standard *** viscosity and total acid number(TAN)of the SL oil increased with the bearing test time,and various deposits were produced in the bearing test,with the micro-particles of the carbon deposits being sphere-like,rod-like,and sheet-like in *** antioxidant additives in the oil were consumed very rapidly in the first 30 h of the bearing test,with N-phenyl-1-naphthylamine being consumed faster than ***,the oil thermal-oxidative process involves very complex physical and chemical mechanisms.

关键词： aviation turbine engine oil high-temperature bearing deposit test thermal-oxidative degradation antioxidant additives

Theoretical understanding of correlation between magnetic phase transition and the superconducting dome in high-Tc cuprates

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 167-173页

作者： Chen Zhang Cai-Xin Zhang Su-Huai Wei haiqing Lin Hui-Xiong Deng State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Beijing Computational Science Research Center Beijing 100193China

Many issues concerning the origin of high-temperature superconductivity(HTS)are still under *** example,how the magnetic order varies with doping and its relationship with the superconducting temperature(Tc);and why Tcalways peaks near the quantum critical *** this paper,taking hole-doped La_(2)CuO_(4)as a classical example,we employ the first-principles band structure and total energy calculations with Monte Carlo simulations to explore how the symmetry-breaking magnetic ground state evolves with hole doping and the origin of a dome-shaped superconductivity region in the phase *** demonstrate that the local antiferromagnetic order and doping play key roles in determining the electron-phonon coupling,thus ***,the La_(2)CuO_(4)possesses a checkerboard local antiferromagnetic ground *** the hole doping increases,Tcincreases with the enhanced electron-phonon coupling *** as the doping increases further,the strength of the antiferromagnetic interaction weakens and spin fluctuation *** the critical doping level,a magnetic phase transition occurs that reduces the local antiferromagnetism-assisted electron-phonon coupling,thus diminishing the *** superconductivity disappears in the heavily overdoped region when the ferromagnetic order *** observations could account for why cuprates have a dome-shaped superconductivity region in the phase *** study,thus,contributes to a fundamental understanding of the correlation between doping,local magnetic order,and superconductivity of HTS.

关键词： high-temperature superconductivity antiferromagnetic order electron-phonon coupling doping effect cuprates

Spatial-temporal differentiation and influencing factors of rural settlements in mountainous areas: an example of Liangshan Yi Autonomous Prefecture, Southwestern China

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2024年第1期21卷 218-235页

作者： WANG Yumeng DENG Qingchun YANG haiqing LIU Hui YANG Feng ZHAO Yakai School of Geographical Sciences China West Normal UniversityNanchong 637009China sichuan Provincial Engineering Laboratory of Monitoring and Control for Soil Erosion in Dry Valleys China West Normal UniversityNanchong 637009China Liangshan Soil Erosion and Ecological Restoration in Dry Valleys Observation and Research Station Xide 616753China

Rural settlement is the basic spatial unit for compact communities in rural area. Scientific exploration of spatial-temporal differentiation and its influencing factors is the premise of spatial layout rationalization. Based on land use data of Liangshan Yi Autonomous Prefecture(hereinafter referred to as Liangshan Prefecture) in sichuan Province, China from 1980 to 2020, compactness index, fractal dimension, imbalance index, location entropy and the optimal parameters-based geographical detector(OPGD) model are used to analyze the spatial-temporal evolution of the morphological characteristics of rural settlements, and to explore the influence of natural geographical factors, socioeconomic factors, and policy factors on the spatial differentiation of rural settlements. The results show that:(1) From 1980 to 2020, the rural settlements area in Liangshan Prefecture increased by 15.96 km^(2). In space, the rural settlements are generally distributed in a local aggregation, dense in the middle and sparse around the periphery. In 2015, the spatial density and expansion index of rural settlements reached the peak.(2) From 1980 to 2020, the compactness index decreased from 0.7636 to 0.7496, the fractal dimension increased from 1.0283 to 1.0314, and the fragmentation index decreased from 0.1183 to 0.1047. The spatial morphological structure of rural settlements tended to be loose, the shape contour tended to be complex, the degree of fragmentation decreased, and the spatial distribution was significantly imbalanced.(3) The results of OPGD detection in 2015 show that the influence of each factor is slope(0.2371) > traffic accessibility(0.2098) > population(0.1403) > regional GDP(0.1325) > elevation(0.0987) > poverty alleviation(0). The results of OPGD detection in 2020 show that the influence of each factor is slope(0.2339) > traffic accessibility(0.2198) > population(0.1432) > regional GDP(0.1219) > poverty alleviation(0.0992) > elevation(0.093). Natural geographical facto

关键词： Rural settlements Location entropy Geographical detector Spatiotemporal differentiation Influencing factors

在线全文

学校读者我要写书评

暂无评论

含水率对土壤有机质含量高光谱估算的影响

农业工程学报 2015年第9期31卷 114-120页

作者：司海青姚艳敏王德营刘影农业部农业信息技术重点实验室北京100081 中国农业科学院农业资源与农业区划研究所北京100081

土壤含水率对有机质（soil organic matter，SOM）含量高光谱估算精度有很大的影响。为了探讨SOM高光谱估算中土壤含水率的影响，该文对烘干土、风干土和质量含水率为5%～40%（按5%递增）的土壤样本进行了室内高光谱测量，对光谱数据进... 详细信息

土壤含水率对有机质（soil organic matter，SOM）含量高光谱估算精度有很大的影响。为了探讨SOM高光谱估算中土壤含水率的影响，该文对烘干土、风干土和质量含水率为5%～40%（按5%递增）的土壤样本进行了室内高光谱测量，对光谱数据进行了反射率、反射率一阶导数和反射率倒数对数3种光谱数据变换，运用偏最小二乘回归法（partial least squares regression，PLSR）建立了相应的SOM估算模型。结果表明，风干土的SOM高光谱估算精度较好；当含水率水平小于25%时，SOM估算模型精度受含水率的影响较大，光谱数据进行反射率倒数对数变换后的模型精度最高；当含水率水平大于等于25%时，水分对土壤光谱反射率的影响要大于SOM，不适宜利用土壤光谱数据进行SOM含量高光谱估算。该研究可为大田环境不同含水率情况下光谱估算SOM提供参考。

关键词：土壤土壤含水率回归有机质高光谱偏最小二乘