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THE CALCULATION OF THE PROFILE-liNEAR AVERAGE VELOCITY IN THE TRANSITION REGION FOR ULTRASONIC HEAT METER BASED ON THE METHOD OF LES

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Journal of Hydrodynamics 2011年第1期23卷 89-94页

作者： liU Yong-hui DU guang-sheng TAO li-li SHEN Fang School of Energy and Power Engineering Shandong University Jinan 250061 China

The measurement accuracy of an ultrasonic heat meter depends on the relationship of the profile-linear average *** are various methods for the calculation of the laminar and turbulence flow regions,but few methods for the transition *** present,the traditional method to deal with the transition region is to adopt the relationship for the turbulent flow *** this article,a simplified model of the pipe is used to study the characteristics of the transition flow with specific Reynolds *** k-εmodel and the Large Eddy Simulation（LES）model are,respectively,used to calculate the flow field of the transition region,and a comparison with the experiment results shows that the LES model is more effective than the k-εmodel,it is also shown that there will be a large error if the relationship based on the turbulence flow is used to calculate the profile-linear average velocity relationship of the transition *** profile-linear average velocity for the Reynolds number ranging from 5 300 to 10 000 are calculated,and the relationship curve is *** results of this article can be used to improve the measurement accuracy of ultrasonic heat meter and provide a theoretical basis for the research of the whole transition flow.

关键词： ultrasonic heat meter Large Eddy Simulation(LES) model profile average velocity linear average velocity pipe

A translational study of somatosensory evoked potential time–frequency components in rats,goats,and humans

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Neural Regeneration Research 2021年第11期16卷 2269-2275页

作者： Hong-Yan Cui Yi-Xin Wu Rong li guang-sheng li Yong Hu Institute of Biomedical Engineering Chinese Academy of Medical Sciences and Peking Union Medical CollegeTianjinChina Department of Orthopaedics and Traumatology The University of Hong KongHong Kong Special Administrative RegionChina Spinal Division Department of OrthopaedicsAffiliated Hospital of Guangdong Medical UniversityGuangdong ProvinceChina Department of Orthopaedics and Traumatology The University of Hong Kong-Shenzhen HospitalShenzhenGuangdong ProvinceChina

Somatosensory evoked potentials(SEPs)have been widely used to assess neurological function in clinical practice.A good understanding of the association between SEP signals and neurological function is helpful for precise diagnosis of impairment *** studies on SEPs have been reported in animal ***,few studies have reported the relationships between SEP waveforms in animals and those in *** this study,we collected normal SEP waveforms and decomposed them into specific time–frequency components(TFCs).Our results showed three stable TFC distribution regions in intact goats and rats and in *** we induced spinal cord injury in the animal models,a greater number of small TFC distribution regions were observed in the injured goat and rat groups than in the normal ***,there were significant correlations(Plinear relationships between the main SEP TFCs of the human group and those of the goat and rat groups.A stable TFC distribution of SEP components was observed in the human,goat and rat groups,and the TFC distribution modes were similar between the three *** in various animal models in this study could be translated to future clinical studies based on SEP TFC *** studies were approved by the Institutional Review Board of the University of Hong Kong/Hospital Authority Hong Kong West Cluster(approval *** 05-312 T/975)on December 5,*** experiments were approved by the Committee on the Use of live Animals in Teaching and Research of li Ka Shing Faculty of Medicine of the University of Hong Kong(approval *** 2912-12)on January 28,*** experiments were approved by the Animal Ethics Committee of Affiliated Hospital of guangdong Medical University(approval ***2002132)on March 5,2018.

关键词： animal models chronic compression latency somatosensory evoked potentials spinal cord injury time-frequency analysis time-frequency components translational study

Macrophage activation syndrome as an initial presentation of systemic lupus erythematosus

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World Journal of Clinical Cases 2020年第11期8卷 2406-2407页

作者： lian-Jie Shi Qian Guo sheng-guang li Department of Rheumatology and Immunology Peking University International HospitalBeijing 102206China

In a recent article on World J Clin Cases 2019;7:3859-3865,Sun et al reported a case of 36-year-old female with macrophage activity syndrome as an onset of systemic lupus *** this is a very interesting case,some concerns still need to be ***,the patient had an extremely elevated serum ferritin but a normal C-reactive protein level,which was unparallel with the inflammatory condition before she received any ***,the diagnosis of systemic lupus erythematosus seemed to be insufficient according to the patient’s medical information presented,most of which were not specific to lupus but could be explained by macrophage activity ***,more medical information on the patient should be provided,and a profound discussion needs to be addressed.

关键词： Systemic lupus erythematosus Macrophage activity syndrome Diagnosis Ferritin C-reactive protein Inflammatory

EXPERIMENTAL STUDY OF VELOCITY DISTRIBUTIONS IN THE TRANSITION REGION OF PIPES

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Journal of Hydrodynamics 2011年第5期23卷 643-648页

作者： liU Yong-hui DU guang-sheng liU li-ping SHAO Zhu-feng ZHAI Cheng-yuan School of Energy and Power Engineering -Shandong University Jinan 250061 China

The accuracy of an ultrasonic flowmeter meaurement depends on the profile-linear average velocity. But this velocity in the transition region is not available at the present. In this article, the velocity in the transition region in pipes is studied by experimental methods. The Particle Image Velocimetry （ PIV ） is used to measure the flow field in the transition region in pipes, and the measured results from PIV are in good agreement with the Westerwell＇s experimental data. Based on the experimental data of PIV, the curves of the profile-linear average velocity in the transition region against the Reynolds number in the range from 2 000 to 20 000 are obtained, and it is shown that the coefficient k is constant when the Reynolds number is in the range of 2 000-2 400 and 6 000-20 000, and the coefficient k is increasing when the Reynolds number is in the range of 2 400-6 000. The results of this article can be used to improve the measurement accuracy of the ultrasonic flowmeters and as a theoretical basis for the research on the transition flow.

关键词： ultrasonic flowmeter Particle Image Velocimetry (PIV) the profile-linear average velocity transition region pipe

Energy saving analysis for CO_(2)–O_(2)mixed injection technology in converter steelmaking

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Journal of Iron and Steel Research International 2024年第5期31卷 1095-1103页

作者： Bao-chen Han Chun-liang Gao Ya-qiang li Dan liu guang-sheng Wei Rong Zhu Hebei Key Laboratory of Material Near-Net Forming Technology School of Material Science and EngineeringHebei University of Science and TechnologyShijiazhuang050018HebeiChina Department of Automotive Engineering Hebei Vocational University of Technology and EngineeringXingtai054000HebeiChina School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

Energy-saving in China's iron and steel industry still relies on the development and improvement of short-term energy saving ***,a special converter smelting technology incorporating energy saving was *** evaluate the energy-saving potential of the CO_(2)–O_(2)mixed injection(COMI)technology,collected production data were used to develop an improved techno-economic *** reveal that the technology can save energy through auxiliary material consumption,sensible heat of solid by-product,iron loss reduction,and energy *** application of COMI technology in an enterprise is cost effective,involving the energy saving potential of 0.206 GJ/t,the cost of conserved energy of−48.83 yuan/GJ,and a simple payback period of 0.35 year for a 60-million-yuan *** analysis shows that the investment cost and discount rate primarily influence the cost of conserved energy of the *** the discount rate increased,the cost of conserved energy also gradually ***,the COMI technology is an energy-saving technology with good development prospects.

关键词： Converter steelmaking COMI technology Energy saving Techno-economic model Investment cost

A development of lifetime measurement based on the differential decay curve method

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Nuclear Science and Techniques 2018年第8期29卷 114-120页

作者： Jian Zhong Xiao-guang Wu Ying-Jun Ma Yun Zheng Cong-Bo li guang-sheng li Bao-Ji Zhu Tian-Xiao li Yan-Jun Jin Yan-Xiang Gao Ke-Yan Ma Dong Yang Hao Guo Jia-Qi Wang Xian Guan Ji Sun China Institute of Atomic Energy Beijing 102413China College of Physics Jilin UniversityChangchun 621010China Shenyang Institute of Engineering Shenyang 110136China

A new development of indirect gating case in the differential decay curve method used for lifetime measurement has been *** gate region was extended from partial shifted peak to both shifted and unshifted *** statistics of flight and stop peaks in gating spectra was improved *** reliability of this change has been tested by reanalysing the lifetime of 2^+ state in^(134) *** result of 32.2(33) ps was fit well with the previous published values within the experimental *** developed method was also used to analyse the lifetime of 2_1^+ state in^(138) Nd.

关键词：线方法腐烂微分开发测量大小写可靠性试验性

Constant charge method or constant potential method:Which is better for molecular modeling of electrical double layers?

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Journal of Energy Chemistry 2024年第7期94卷 54-60页

作者： liang Zeng Xi Tan Xiangyu Ji Shiqi li Jinkai Zhang Jiaxing Peng sheng Bi guang Feng State Key Laboratory of Coal Combustion Schoolof Energy and PowerEngineeringHuazhong Universityof Science and Technology(HUST)Wuhan 430074HubeiChina Sorbonne Universite CNRSPhysico-chimie des Electrolytes et Nanosystemes InterfaciauxPHENIXF-75005 ParisFrance

In molecular modeling of electrical double layers(EDLs),the constant charge method(CCM)is prized for its computational efficiency but cannot maintain electrode equipotentiality like the more resourceintensive constant potential method(CPM),potentially leading to *** certain scenarios,CCM can yield results identical to ***,there are no clear guidelines to determine when CCM is sufficient and when CPM is ***,we conduct a series of molecular simulations across various electrodes and electrolytes to present a comprehensive comparison between CCM and CPM under different charging *** reveal that CCM approximates CPM effectively in capturing equilibrium EDL and current-driven dynamics in open electrode systems featuring ionic liquids or regular concentration aqueous electrolytes,while CPM is indispensable in scenarios involving organic and highly concentrated aqueous electrolytes,nanoconfinement effects,and voltage-driven *** work helps to select appropriate methods for modeling EDL systems,prioritizing accuracy while considering computationalefficiency.

关键词： Electrochemical interface Molecular dynamics Electrode polarization modeling Nanoconfinement effect

Evaluating the efficacy of immunotherapy in gastric cancer:Insights from immune checkpoint inhibitors

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World Journal of Gastroenterology 2024年第32期30卷 3726-3729页

作者： Yu-Nuo Yang li-sheng Wang Yan-Qi Dang guang Ji Institute of Digestive Diseases Longhua HospitalChina-Canada Center of Research for Digestive DiseasesShanghai University of Traditional Chinese MedicineShanghai 200032China Department of Biochemistry University of OttawaOttawa K1H 8M5ONCanada

The emergence of immunotherapy,particularly immune checkpoint inhibitors(ICIs),represents a groundbreaking approach to treating gastric cancer(GC).However,the prognosis of GC patients receiving ICI treatment is influenced by various *** manuscript identified sarcopenia and myosteatosis as independent prognostic factors impacting the outcomes of GC patients treated with ***,this study introduced a visual predictive model to estimate the prognosis of GC *** confirmed by further studies,this observation could provide valuable insights to propel the advancement of personalized clinical medicine and the integration of precision medicine practices.

关键词： Gastric cancer Immune checkpoint inhibitors Sarcopenia Myosteatosis Prediction model

Segregation of Mg-6Gd alloy under natural convection:From macro solute distribution to micro dendrite growth

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China Foundry 2024年第5期21卷 613-624页

作者： Hong-xu Chen Ang Zhang Hao li Yu Gao Yu-hong Cui guang-sheng Huang Bin Jiang Fu-sheng Pan National Engineering Research Center for Magnesium Alloys National Key Laboratory of Advanced Casting TechnologiesCollege of Materials Science and EngineeringChongqing UniversityChongqing 400044China

Segregation is a serious defect in alloy ingots which severely deteriorates materials *** segregation defect in Mg-6Gd alloy is studied by coupling macro thermal-solutal-convection transport and micro dendrite *** macroscopic fluid dynamics and mass transfer equations are resolved to forecast the segregation behavior under conditions of continuous temperature variation during the solidification *** numerical model is validated by testing double-diffusive natural convection in a closed square cavity.A phase field model is then applied to simulate the micro dendrite growth,using macro undercooling and liquid flow velocity as boundary *** show that the multiscale segregation behavior,including macro solute distribution and micro dendritic morphology,is strongly dependent on the temperature condition and the liquid convection,which provides guidance for reducing and eliminating the segregation defect.

关键词： magnesium alloy segregation numerical simulation phase-field simulation multiscale