检索结果-南通市图书馆

A Feasible and Novel Multi-Generation System Taking Advantage of Two-Stage Compressor for luxury Hotels

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 Thermal Science 2021年第3期30卷 817-827页

作者： LI Hongqiang ZHOU Saiqun HE Changjie deng lu LI lu LI Shuisheng ZHANG Guoqiang College of Civil Engineering Hunan UniversityChangsha 410082China National Center for International Research Collaboration in Building Safety and Environment(NCIRCBSE) Hunan UniversityChangsha 410082China Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education Hunan UniversityChangsha 410082China 3rd Construction Co. Ltd of China Construction Fifth EngineeringChangsha 410004China Key Laboratory for Damage Diagnosis of Engineering Structures of Hunan Province Hunan UniversityChangsha 410082China Ltd of China Construction Fifth Engineering Changsha 410004China

In order to satisfy heating,cooling and domestic hot water demand and energy conversion in luxury hotels,a feasible and novel multi-generation system taking advantage of the two-stage compressor was proposed and *** feature of this novel system is that the compressing power can be reduced and domestic water can be generated at the same time by adopting two-stage compressors instead of conventional one-stage compressor with a high compressing *** energy-saving mechanism and two operating modes were introduced in *** a further way,the thermodynamic performance was calculated by Aspen Plus so as to make a better understanding of this novel *** the calculation results showed that,in summer and transition seasons operating mode,the system can obtain COP(Coefficient of Performance)7.3,and 60℃ domestic hot water,when evaporating temperature is 4℃;while,in winter season operating mode,the system can obtain COP 3.1,and 58℃ domestic hot water,when evaporating temperature is-24℃.Compared with the conventional independent systems,this system can achieve higher energy-efficient,higher waste heat recovery,reduce energy consumption,and meet multiple energy demands simultaneously.

关键词： two-stage compression building energy conversion heat recovery district energy systems energy saving multi-energy output

Modified Pressure Loss Model for T-junctions of Engine Exhaust Manifold

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2014年第6期27卷 1232-1239页

作者： WANG Wenhui lu Xiaolu CUI Yi deng Kangyao Key Laboratory for Power Machinery and Engineering of Ministry of Education Shanghai Jiaotong University

The T-junction model of engine exhaust manifolds significantly influences the simulation precision of the pressure wave and mass flow rate in the intake and exhaust manifolds of diesel engines. Current studies have focused on constant pressure models, constant static pressure models and pressure loss models. However, low model precision is a common disadvantage when simulating engine exhaust manifolds, particularly for turbocharged systems. To study the performance of junction flow, a cold wind tunnel experiment with high velocities at the junction of a diesel exhaust manifold is performed, and the variation in the pressure loss in the T-junction under different flow conditions is obtained. Despite the trend of the calculated total pressure loss coefficient, which is obtained by using the original pressure loss model and is the same as that obtained from the experimental results, large differences exist between the calculated and experimental values. Furthermore, the deviation becomes larger as the flow velocity increases. By improving the Vazsonyi formula considering the flow velocity and introducing the distribution function, a modified pressure loss model is established, which is suitable for a higher velocity range. Then, the new model is adopted to solve one-dimensional, unsteady flow in a D6114 turbocharged diesel engine. The calculated values are compared with the measured data, and the result shows that the simulation accuracy of the pressure wave before the turbine is improved by 4.3% with the modified pressure loss model because gas compressibility is considered when the flow velocities are high. The research results provide valuable information for further junction flow research, particularly the correction of the boundary condition in one-dimensional simulation models.

关键词： T-junction diesel engine pressure loss model total pressure loss coefficient

Sulfur–nitrogen co-doped graphene supported cobalt–nickel sulfide rGO@SN-CoNi_(2)S_(4) as highly efficient bifunctional catalysts for hydrogen/oxygen evolution reactions

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第3期41卷 911-920页

作者： Bing-lu deng Li-Ping Guo Yuan lu Hai-Bo Rong Dong-Chu Cheng School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528000China Guangdong Key Laboratory for Hydrogen Energy Technologies Foshan 528000China School of Environment and Energy South China University of TechnologyGuangzhou 510006China

Designing highly active and stable electrocata-lysts for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is a challenge for energy con-version and storage *** this work,a S and N co-doped graphene supported cobalt–nickel sulfide composite catalyst(rGO@SN-CoNi_(2)S_(4))was synthesized simply via a one-step hydrothermal *** as-synthesized CoNi_(2)S_(4)particles grew in a mosaic manner inside GO lamellae and were encapsulated with *** a bifunctional catalyst,the r GO@SN-CoNi_(2)S_(4)exhibits excellent electrocatalytic performance under alkaline con-ditions,which only required the overpotential of 142.6 mV(***)and 310 m V(***)to deliver a current density of 10 mA·cm^(-2) for HER and OER,*** good hydrophilicity of the r GO@SN,the pure phase of bimetallic structure,and the chemical coupling/interaction between the CoNi_(2)S_(4)and the rGO@SN are attributable to be the possible reasons responsible for the higher HER and OER catalytic ***,the rGO@SN-CoNi_(2)S_(4)also shows a great potential for serving as an excellent cathode and anode electrolyzer during the water splitting process.

关键词： Hydrogen evolution reaction Oxygen evolution reaction S and N co-doped grapheme Cobalt–nickel sulfide Water splitting

Self-mixed self-interference analog cancellation in full-duplex communications

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2016年第4期59卷 31-44页

作者： Hongtao lu Shihai SHAO Kai deng Youxi TANG National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China Department of Physical Science and Electronic Engineering Yibin University

Rather than using existing self-interference cancellation methods, which essentially consist of reconstruction and subtraction, this paper proposes a novel approach, based on multiplication, to cancel selfinterference in the analog domain in full-duplex communications. This approach is called self-mixed selfinterference analog cancellation(SM-SIAC). Moreover, rather than using an individual analog cancellation circuit in existing self-interference cancellation methods, SM-SIAC can merge the analog cancellation circuit and the receiver. SM-SIAC is configured with three auto-tuning loops, consisting of one delay loop and two gain loops. SM-SIAC is further simplified with the Gaussian minimum shift keying(GMSK) self-interference *** these loops converge, the paper analyzes the cancellation capacity and derives a closed-form expression for the quadrature amplitude modulation self-interference signal and the GMSK self-interference signal. Simulation results illustrate the convergence of the gain loops and the cancellation capacity in the presence of engineering errors.

关键词： self-interference cancellation full-duplex self-mixed analog cancellation auto-tuning

THREE-DIMENSIONAL FLOW AROUND TWO TANDEM CIRCULAR CYLINDERS WITH VARIOUS SPACING AT Re=220

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2006年第1期18卷 48-54页

作者： deng Jian REN An-lu ZOU Jian-feng Department of Mechanics Zhejiang University Hangzhou 310027 China

The flow around two tandem circular cylinders was studied by a three-dimensional numerical simulation of the Navier-Stokes equations at Re=220 . The improved virtual boundary method was applied to model the no-slip boundary condition of the cylinders. The results show that as the spac ing ratio L/D≥4 , the three dimensionality occurs in the wake. When L/D≤3.5 the wake keeps a two-dimensional state at the Reynolds number Re=220 . The critical spacing for the appearance of three-dimensional instability obtained is at the range 3.5〈 L/D 〈 4, similar to the critical spacing found in two-dimensional case. Two sources of instability from upstream and downstream cylinder generate a complicat ed vortex structures in the wake, investigated by streamlines topology analysis in the streamwise plane. Many other interesting problems were also addressed in this paper.

关键词： three-dimensional Navier-Stokes equations,virtual boundary method flow around two tandem circular cylinders three-dimensional vortex structure

Hantavirus Infection during Pregnancy

在线全文

学校读者我要写书评

暂无评论

Virologica Sinica 2021年第3期36卷 345-353页

作者： deng-Hui lu Hong Jiang Jian-Qi Lian The Center of Diagnosis and Treatment of Infectious Diseases The Second Affiliated HospitalAir Force Medical UniversityXi'an 710038China

Hantavirus infection is a global health challenge,causing widespread public *** recent years,cases of hantavirus infection in pregnant women have been reported in many *** infected pregnant women and their fetuses appear to have more severe clinical symptoms and worse clinical ***,to study the prevalence of hantavirus infection in pregnant women,this study will focus on the epidemiological distribution of the virus,different virus species penetrating the placental barrier,and factors affecting the incidence and clinical outcome of the infection in pregnant women and their *** addition,this review will also discuss the diagnostic tools and treatments for pregnant patients and provide an overview of the relevant future research.

关键词： Hantavirus Pregnancy Hantaan virus(HTNV) HPS HFRS

The Influence of Airflow Transport Pathways on Precipitation during the Rainy Season in the Liupan Mountains of Northwest China

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2024年第11期41卷 2215-2229页

作者： Yujun QIU Chunsong lu Zhiliang SHU Peiyun deng Key Laboratory of Aerosol-Cloud-Precipitation of China Meteorological Administration Nanjing University of Information Science&TechnologyNanjing 210044China Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions China Meteorological AdministrationYinchuan 750002China Ningxia Key Laboratory of Meteorological Disaster Prevention and Reduction Yinchuan 750002China

This study investigates the influence of airflow transport pathways on seasonal rainfall in the mountainous region of the Liupan Mountains(LM) during the rainy seasons from 2020 to 2022, utilizing observational data from seven ground gradient stations located on the eastern slopes, western slopes, and mountaintops combined with backward trajectory cluster analysis. The results indicate 1) that the LM's rainy season, characterized by overcast and rainy days, is mainly influenced by cold and moist airflows(CMAs) from the westerly direction and warm and moist airflows(WMAs) from a slightly southern direction. The precipitation amounts under four airflow transport paths are ranked from largest to smallest as follows: WMAs, CMAs, warm dry airflows(WDAs), and cold dry airflows(CDAs). 2) WMAs contribute significantly more to the intensity of regional precipitation than the other three types of airflows. During localized precipitation events,warm airflows have higher precipitation intensities at night than cold airflows, while the opposite is true during the afternoon. 3) During regional precipitation events, water vapor content is the primary influencing factor. Precipitation characteristics under humid airflows are mainly affected by high water vapor content, whereas during dry airflow precipitation, dynamic and thermodynamic factors have a more pronounced impact. 4) During localized precipitation events, the influence of dynamic and thermodynamic factors is more complex than during regional precipitation, with the precipitation characteristics of the four airflows closely related to their water vapor content, air temperature and humidity attributes, and orographic lifting. 5) Compared to regional precipitation, the influence of topography is more prominent in localized precipitation processes.

关键词： regional precipitation localized precipitation airflow transport water vapor flux instability energy topographic influence

Controlled 2D growth of organic semiconductor crystals by suppressing “coffee-ring” effect

在线全文

学校读者我要写书评

暂无评论

Nano Research 2020年第9期13卷 2478-2484页

作者： Wei Wang Bei lu Wei deng Xiujuan Zhang Zhengjun lu Di Wu Jiansheng Jie Xiaohong Zhang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Key Laboratory of Materials Physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China

Owing to enhanced charge transport efficiency arising from the ultrathin nature,two-dimensional(2D)organic semiconductor single crystals(OSSCs)are emerging as a fascinating platform for high-performance organic field-effect transistors(OFETs).However,ucoffee-ring"effect induced by an evaporation-induced convective flow near the contact line hinders the large-area growth of 2D OSSCs through a solution ***,we develop a new strategy of suppressing the"coffee-ring"effect by using an organic semiconductor:polymer blend *** the high-viscosity polymer in the organic solution,the evaporation-induced flow is remarkably weakened,ensuring the uniform molecule spreading for the 2D growth of the *** an example,wafer-scale growth of crystalline film consisting of few-layered 2,7-didecylbenzothienobenzothiophene(C10-BTBT)crystals was successfully accomplished via blade *** based on the crystalline film exhibited a maximum hole mobility up to 12.6 cm^2·V^-1·s^-1,along with an average hole mobility as high as 8.2 cm^2·V^-1·s^-*** work provides a promising strategy for the large-area growth of 2D OSSCs toward high-performance organic electronics.

关键词： two-dimensional(2D)organic semiconductor single crystals two-dimensional(2D)growth mode coffee-ring effect organic field-effect transistors

Dynamics Modeling and Parameter Identification for a Coupled-Drive Dual-Arm Nursing Robot

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

Chinese Journal of Mechanical Engineering 2024年第4期37卷 243-257页

作者： Hao lu Zhiqiang Yang Deliang Zhu Fei deng Shijie Guo College of Electronic Information and Automation Tianjin University of Science and TechnologyTianjin 300222China Academy for Engineering&Technology Fudan UniversityShanghai 200433China Shanghai Engineering Research Center of AI&Robotics Shanghai 200433China School of Mechanical Engineering Hebei University of TechnologyTianjin 300130China

A dual-arm nursing robot can gently lift patients and transfer them between a bed and a *** its lightweight design,high load-bearing capacity,and smooth surface,the coupled-drive joint is particularly well suited for these ***,the coupled nature of the joint disrupts the direct linear relationship between the input and output torques,posing challenges for dynamic modeling and practical *** study investigated the transmission mechanism of this joint and employed the Lagrangian method to construct a dynamic model of its internal *** on this foundation,the Newton-Euler method was used to develop a dynamic model for the entire robotic arm.A continuously differentiable friction model was incorporated to reduce the vibrations caused by speed transitions to *** experimental method was designed to compensate for gravity,inertia,and modeling errors to identify the parameters of the friction *** method establishes a mapping relationship between the friction force and motor *** addition,a Fourier series-based excitation trajectory was developed to facilitate the identification of the dynamic model parameters of the robotic *** tracking experiments were conducted during the experimental validation phase,demonstrating the high accuracy of the dynamic model and the parameter identification method for the robotic *** study presents a dynamic modeling and parameter identification method for coupled-drive joint robotic arms,thereby establishing a foundation for motion control in humanoid nursing robots.

关键词： Nursing-care robot Coupled-drive joint Dynamic modeling Parameter identification