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Numerical Simulation of Charging Performance of Combined Sensible-Latent Heat Storage System with a Macro-Encapsulation Method

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Journal of Thermal Science 2023年第6期32卷 2008-2017页

作者： WANG Wei PAN Zhenfei lei biao WU Yuting WANG Jingfu MA Chongfang Key Laboratory of Enhanced Heat Transfer and Energy Conservation Ministry of EducationCollege of Energy and Power EngineeringBeijing University of TechnologyBeijing100124China Key Laboratory of Heat Transfer and Energy Conversion Beijing MunicipalityCollege of Energy and Power EngineeringBeijing University of TechnologyBeijing100124China

In recent years,heat storage system combining sensible and latent heat materials has received more and more *** this paper,we proposed the hybrid configuration with a macro-encapsulation,and analyzed its charging performance with different influencing factors by CFD *** the case,the sensible heat storage materials are magnesia brick or HT concrete and the phase change materials(PCMs)are mixed molten ***,we analyzed the heat transfer characteristics of the hybrid configuration in charging ***,we analyzed the effect of heating power on charging *** maximum temperature of the heating surface shall not exceed 500℃as the constraint condition,the heat storage capacity increases at first and then decreases with the heating ***,we compared the charging performance of different solid structure and the hybrid *** magnesia brick or HT concrete,the charging performance of the solid structure is better than that of the hybrid configuration,because the thermal conductivity of the molten salt is significantly lower than that of the two sensible heat storage ***,we compared the charging performance of different molten *** hybrid configuration with lower melting point molten salt has better performance because of more intensity natural ***,we analyzed the charging performance of the hybrid configuration used the composite phase change material(CPCM)with high thermal conductivity and specific *** the result,the charging performance increases by 22.5%compared with the solid *** results indicate that the hybrid configuration with the macro-encapsulation method is a potential form of thermal energy storage,but it needs to be further optimized.

关键词： thermal energy storage hybrid configuration natural convection thermophysical property charging performance

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A Theoretical Criterion for Evaluating the Thermodynamic Effectiveness of Regenerators in Organic Rankine Cycle Systems

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Journal of Thermal Science 2021年第6期30卷 2027-2036页

作者： lei biao ZHANG Cancan ZHANG Yeqiang WU Yuting WANG Wei MA Chongfang MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China School of Energy and Power Engineering Zhengzhou University of Light IndustryZhengzhou 450002China

Organic Rankine Cycle(ORC)is a promising technology for converting low or medium temperature heat into *** order to improve the thermodynamic efficiency of ORC systems,adding a regenerator to the system has been widely ***,this needs additional pipes and devices and they will produce additional pressure *** both the contributions of the regenerator and the power losses caused by additional pressure drop,a theoretical criterion for evaluating the thermodynamic effectiveness of adding a regenerator was proposed by means of mathematic and thermodynamic *** core of the criterion is a new concept named Critical Pressure Drop produced by the Regenerator(CPDR).A negative value of CPDR indicates that adding a regenerator will not contribute to the thermodynamic efficiency of ORC systems in any *** effective regenerator needs a positive value of CPDR,and requires that the value of additional pressure drop produced by introducing the regenerator should be smaller than *** influences of evaporation temperature,condensation temperature,expander efficiency,regenerator effectiveness and working fluids on CPDR were also *** was found that lower evaporation temperature or using working fluids with higher critical temperature tends to reduce the value of CPDR.

关键词： Organic Rankine Cycle regenerator additional pressure drops

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Performance Improvement of Single Screw Compressor by Meshing Clearance Adjustment Used in Refrigeration System

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Journal of Thermal Science 2021年第1期30卷 149-164页

作者： LU Yuanwei LIU Shanwei WU Yuting lei biao ZHI Ruiping WEN Qiangyu MA Chongfang Key Laboratory of Enhanced Heat Transfer and Energy Conservation Ministry of EducationCollege of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China Key Laboratory of Heat Transfer and Energy Conversion Beijing MunicipalityCollege of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China

The single screw compressor(SSC)is widely used in air compression and refrigeration systems due to its many *** meshing clearance between the screw groove and gate rotor teeth flank has a significant influence on the compressor *** this paper,mathematical calculation models describing the internal working process of the SSC are established in order to evaluate the thermal dynamic characteristics of the compressor under varying meshing clearance *** refrigerating capacity,volume efficiency and adiabatic efficiency of the SSC are calculated and *** prototypes,with different meshing clearance heights,were manufactured to study the internal influence *** theoretical model was verified using experimental data and the calculation results strongly agreed with the experimental *** demonstrate that comparisons of volume efficiency and adiabatic efficiency between the measured and calculated results exhibited deviations of 3.64%-7.98%and 5.92%-9.4%,*** on the models,analysis under varying meshing clearance heights and working conditions was *** into account working performance,actual manufacturing conditions and manufacturing cost limitations,a meshing clearance height range from 0.01 mm to 0.08 mm is *** study can provide important theoretical data and experimental support for the design,manufacturing and optimization of single screw compressors.

关键词： single screw compressor leakage performance improvement meshing clearance height refrigeration

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First total synthesis of eudistalbin A

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Chinese Chemical Letters 2010年第8期21卷 889-891页

作者： Pu Yong Zhang Jun lei Wang Sheng biao Wan Tao Jiang School of Medicine and Pharmacy Key Laboratory of Marine DrugsMinistry of Education Ocean University of ChinaQingdao 266003China

Eudistalbin A was isolated from marine tunicate eudistoma album and possess cytotoxic activity（ED_（50）3.2μg/mL） in vitro against the growth of KB human buccal carinoma *** synthetic eudistalbin A showed potent inhibitory activity against the breast carcinoma cell line MDA-231 with an IC_（50） value of 2.1μmol/L using the metabolic assay *** structures of new compounds were confirmed by ~1H NMR,^（13）C NMR,HRMS and optical rotation.

关键词： β-Carboline Eudistalbin A Pictet-Spengler reaction Henry reaction Total synthesis

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Electrodeposition of functionally graded Ni-W/Er2O3 rare earth nanoparticle composite film

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International Journal of Minerals,Metallurgy and Materials 2020年第6期27卷 818-829页

作者： Guo-quan Lai Hong-zhong Liu Bang-dao Chen Dong Niu biao lei Wei-tao Jiang State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China

Multi-layered functionally graded(FG)structure Ni-W/Er2O3 nanocomposite films were prepared by continuously changing the deposition parameters,in which the Er2O3 and W contents varied with *** microstructure and chemical composition of the electrodeposited Ni-W/Er2O3 films were determined by scanning electron microscopy(SEM)and energy-dispersive X-ray spectroscopy(EDS).The anti-corrosion and wear properties of the electrodeposition films were investigated by electrochemical measurement and ball-on-disk friction *** microhardness distribution of the cross section of nanocomposites was measured by *** results showed that with decreasing agitation rate or increasing average current density,the contents of Er2O3 nanoparticles and tungsten were distributed in a gradient along the thickness,and the contents on the surface were *** comparison,FG Ni-W/Er2O3 films had better anti-corrosion and wear properties than the uniform Ni-W/Er2O3 *** force microscopy(AFM)and profilometry measurements indicated that Er2O3 nanoparticles had an effect on the surface roughness.

关键词： nickel-tungsten electrodeposition functionally graded material nanocomposite erbium oxide nanoparticle

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C-reactive protein to albumin ratio predict responses to programmed cell death-1 inhibitors in hepatocellular carcinoma patients

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World Journal of Gastrointestinal Oncology 2024年第1期16卷 61-78页

作者： Bai-Bei Li lei-Jie Chen Shi-Liu Lu biao lei Gui-Lin Yu Shui-Ping Yu Department of Hepatobiliary Surgery The First Affiliated Hospital of Guangxi Medical UniversityNanning 530021Guangxi Zhuang Autonomous RegionChina Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor(Guangxi Medical University) Ministry of EducationNanning 530021Guangxi Zhuang Autonomous RegionChina Guangxi Key Laboratory of Immunology and Metabolism for Liver Diseases Guangxi Medical UniversityNanning 530021Guangxi Zhuang Autonomous RegionChina Department of Gastroenterology The Second Xiangya Hospital of Central South UniversityNanning 410011Guangxi Zhuang Autonomous RegionChina Department of Emergency The First Affiliated Hospital of Guangxi Medical UniversityNanning 530021Guangxi Zhuang Autonomous RegionChina

BACKGROUND Over the years,programmed cell death-1(PD-1)inhibitors have been routinely used for hepatocellular carcinoma(HCC)treatment and yielded improved survival ***,significant heterogeneity surrounds the outcomes of most ***,it is critical to search for biomarkers that predict the efficacy of PD-1 inhibitors in patients with *** To investigate the role of the C-reactive protein to albumin ratio(CAR)in evaluating the efficacy of PD-1 inhibitors for *** The clinical data of 160 patients with HCC treated with PD-1 inhibitors from January 2018 to November 2022 at the First Affiliated Hospital of Guangxi Medical University were retrospectively *** The optimal cut-off value for CAR based on progression-free survival(PFS)was determined to be 1.20 using x-tile *** proportional risk model was used to determine the factors affecting *** Cooperative Oncology Group performance status[hazard ratio(HR)=1.754,95%confidence interval(95%CI)=1.045-2.944,P=0.033],CAR(HR=2.118,95%CI=1.057-4.243,P=0.034)and tumor number(HR=2.932,95%CI=1.246-6.897,P=0.014)were independent prognostic factors for overall ***(HR=2.730,95%CI=1.502-4.961,P=0.001),tumor number(HR=1.584,95%CI=1.003-2.500,P=0.048)and neutrophil to lymphocyte ratio(HR=1.120,95%CI=1.022-1.228,P=0.015)were independent prognostic factors for *** nomograms were constructed based on independent prognostic *** C-index index and calibration plots confirmed that the nomogram is a reliable risk prediction *** ROC curve and decision curve analysis confirmed that the nomogram has a good predictive effect as well as a net clinical *** Overall,we reveal that the CAR is a potential predictor of short-and long-term prognosis in patients with HCC treated with PD-1 *** further verified,CAR-based nomogram may increase the number of markers that predict individualized prognosis.

关键词： C-reactive protein to albumin ratio Hepatocellular carcinoma Programmed cell death-1 inhibitors Prognosis Nomogram

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Da Vinci robot-assisted pancreato-duodenectomy in a patient with situs inversus totalis:A case report and review of literature

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World Journal of Gastrointestinal Oncology 2022年第7期14卷 1363-1371页

作者： Bai-Bei Li Shi-Liu Lu Xiang He biao lei Jian-Ni Yao Si-Chen Feng Shui-Ping Yu Department of Hepatobiliary Surgery The First Affiliated Hospital of Guangxi Medical UniversityNanning 530021Guangxi Zhuang Autonomous RegionChina

BACKGROUND Situs inversus totalis(SIT)is an extremely rare congenital malformation characterized by mirror displacement of the thoracoabdominal organs such as the heart,liver,spleen,and ***,we describe a patient with SIT complicated with cholangiocarcinoma who underwent successful pancreaticoduodenectomy with the assistance of a da Vinci *** SUMMARY A 58-year-old female presented to the hospital with paroxysmal pain in her left upper abdomen,accompanied by jaundice and staining of the sclera as chief *** examination detected a mass at the distal end of the common bile duct,with inverted thoracic and abdominal *** retrograde cholangiopancreatography forceps biopsy revealed the presence of a well-differentiated *** patient successfully underwent robotic-assisted pancreaticoduodenectomy;the operation lasted 300 min,the intraoperative blood loss was 500 mL,and there were no intraoperative and postoperative *** SIT is not directly related to the formation of *** preoperative imaging examination is conducive to disease diagnosis and also convenient for determining the feasibility of tumor ***-assisted pancreaticoduodenectomy for SIT complicated with cholangiocarcinoma provides a safe,feasible,minimally invasive,and complication-free alternative with adequate preoperative planning combined with meticulous intraoperative procedures.

关键词： Situs inversus totalis Cholangiocarcinoma Da Vinci robot Whipple Surgery Case report

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Complements are involved in alcoholic fatty liver disease, hepatitis and fibrosis

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World Journal of Hepatology 2018年第10期10卷 662-669页

作者： Cheng-Jie Lin Zhi-Gao hu Guan-Dou Yuan biao lei Song-Qing he Department of Hepatopancreatobiliary Surgery the first Affiliated Hospital of Guangxi Medical University

The complement system is a key component of the body's immune system. When abnormally activated, this system can induce inflammation and damage to normal tissues and participate in the development and progression of a variety of diseases. In the past, many scholars believed that alcoholic liver disease(ALD) is induced by the stress of ethanol on liver cells, including oxidative stress and dysfunction of mitochondria and protease bodies, causing hepatocyte injury and apoptosis. Recent studies have shown that complement activation is also involved in the genesis and development of ALD. This review focuses on the roles of complement activation in ALD and of therapeutic intervention in complement-activation pathways. We intend to provide new ideas on the diagnosis and treatment of ALD.

关键词： Alcoholic liver disease complement system proteins Complement regulator liver cells hepatocyte injury

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逆变器无连线并联系统的统一小信号模型及应用

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浙江大学学报（工学版） 2007年第6期41卷 1111-1115页

作者：马皓雷彪浙江大学电气工程学院浙江杭州310027

为分析逆变器无连线并联系统的稳定性,建立了一种以下垂法作为均流控制方法的并联系统的统一小信号模型,并给出了下垂系数的设计方法.该小信号模型可适用于传统下垂法及改进下垂法控制的并联系统.基于小信号模型建立了由2台1 kVA逆变器... 详细信息

为分析逆变器无连线并联系统的稳定性,建立了一种以下垂法作为均流控制方法的并联系统的统一小信号模型,并给出了下垂系数的设计方法.该小信号模型可适用于传统下垂法及改进下垂法控制的并联系统.基于小信号模型建立了由2台1 kVA逆变器构成的无连线并联系统,使用Matlab绘制了该并联系统的根轨迹图,分析了下垂系数变化对系统稳定性和动态响应性能的影响,并在此基础上选取了适当的下垂系数,使系统能稳定运行,实现较好的均流效果.实验结果证实了该小信号模型及下垂系数设计方法的正确性和可行性.

关键词：逆变器无连线并联小信号模型稳定性分析

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An Improved DOA Estimation Method Based on Sparse Reconstruction

An Improved DOA Estimation Method Based on Sparse Reconstruc...

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第十四届中国卫星导航年会

作者： Jiahao Yang Zhongliang Deng Zhichao Zang biao lei Beijing University of Posts and Telecommunications BUPT

With the development of millimeter wave technology and the increasingly complex electromagnetic environment, the traditional method of DOA estimation based on subspace technology can not meet the high-precision position requirements of space-time networks in various application scenarios. For this reason, scholars have introduced compressed sensing and sparse reconstruction technology into the problem of array signal estimation, and used sparse Bayesian(SBL) reconstruction based methods to estimate the angle of arrival(DOA), which often faces the problems of estimation performance and computation adjustment. In this paper, we propose a Bayesian grid iteration algorithm with low computational complexity while ensuring high estimation performance. Firstly, the SBL with the lowest computational complexity is used for rough estimation of the direction of arrival, and the grid is divided unevenly according to the rough estimation results. After the grid division termination condition is reached, the MDL criterion is used to estimate the number of sources, and the signal is decomposed into SVD. Finally, the updated grid division is combined with the SVD decomposition results, and the DOA is fine estimated using Root SBL. Simulation results show that this algorithm has low computational complexity and high estimation performance.

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