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Non-uniform operative temperature distribution characteristics and heat-source-controlled core-area range of local heating radiators

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Building Simulation 2023年第1期16卷 87-103页

作者： Dengjia Wang Weijia Li Yanfeng Liu yaowen chen Liang Hu Hu Du State Key Laboratory of Green Building in Western China Xi'an University of Architecture and TechnologyXi'an 710055China School of Building Services Science and Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Welsh School of Architecture Cardiff UniversityCardiffCF103NBUK

Heating the whole space,which is currently used in northern China,leads to high energy consumption and substantial pollution.A transition to local heating has the potential to help address this *** this paper,the effects of radiator-related parameters(position,power,and size)and room-related parameters(aspect ratio and height)on local heating were *** evaluation indices,the effective coefficient of operative temperature(OTEC)and the effective coefficient of local heating(LHEC),were *** addition,the heat source-control core-area(HSCCA)was proposed,and the effect range of heat sources in the space was evaluated by the attenuation of operative *** findings demonstrated that the radiator position has a greater influence on local heating than *** the position of the radiator was changed from"close to the inner wall"to"close to the outer wall",the LHEC(the interior one-quarter of room is a local heating zone)was found to decrease by 73%.The size of the radiator,which is close to the inner wall,doubled or quadrupled,and the LHEC increased by 9%and 18%.Moreover,rooms with a larger aspect ratio or small room height were found to be the most optimal for local heating *** area of the HSCCA decreased as the position of the radiator approached the outer *** findings of this study can be used as a design reference for the radiator when the heating mode changes from"full-space heating"to"local heating".

关键词： local heating radiator non-uniform thermal environment operative temperature mean radiant temperature temperature distribution

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An efficient and accurate numerical method for simulating close-range blast loads of cylindrical charges based on neural network

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Defence Technology(防务技术) 2025年第2期44卷 257-271页

作者： Ting Liu Changhai chen Han Li yaowen Yu Yuansheng cheng School of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Naval Architecture and Ocean Engineering Hydrodynamics Wuhan 430074China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240China

To address the problems of low accuracy by the CONWEP model and poor efficiency by the Coupled Eulerian-Lagrangian(CEL)method in predicting close-range air blast loads of cylindrical charges,a neural network-based simulation(NNS)method with higher accuracy and better efficiency was *** NNS method consisted of three main ***,the parameters of blast loads,including the peak pressures and impulses of cylindrical charges with different aspect ratios(L/D)at different stand-off distances and incident angles were obtained by two-dimensional numerical ***,incident shape factors of cylindrical charges with arbitrary aspect ratios were predicted by a neural ***,reflected shape factors were derived and implemented into the subroutine of the ABAQUS code to modify the CONWEP model,including modifications of impulse and *** reliability of the proposed NNS method was verified by related experimental *** accuracy improvement was acquired by the proposed NNS method compared with the unmodified CONWEP ***,huge efficiency superiority was obtained by the proposed NNS method compared with the CEL *** proposed NNS method showed good accuracy when the scaled distance was greater than 0.2 m/kg^(1/3).It should be noted that there is no need to generate a new dataset again since the blast loads satisfy the similarity law,and the proposed NNS method can be directly used to simulate the blast loads generated by different cylindrical *** proposed NNS method with high efficiency and accuracy can be used as an effective method to analyze the dynamic response of structures under blast loads,and it has significant application prospects in designing protective structures.

关键词： Close-range air blast load Cylindrical charge Numerical method Neural network CEL method CONWEP model

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A Design of Software and Hardware System for Pre-hospital Emergency Treatment

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Chinese Journal of Biomedical Engineering(English Edition) 2020年第3期29卷 1-9页

作者： Bingxu Ye Feng chen Shaomin Ou Yang Xie yaowen chen The Key Lab of Digital Signal and Image Processing of Guangdong Shantou Guangdong 515063China Shantou University Medical College Shantou Guangdong 515041China The Second Affiliated Hospital of Shantou University Medical College Shantou Guangdong 515041China

This paper aims to improve the pre-hospital first-aid knowledge and pre-hospital first-aid success rate and optimize the pre-hospital emergency *** paper mainly discusses a comprehensive pre-hospital emergency system,which consists of the hardware part and software *** hardware is based on the international cardiopulmonary resuscitation guidelines,and a cardiopulmonary resuscitation(CPR)training auxiliary equipment is developed,which can be applied in pre-hospital first aid training to help people perform accurate chest *** software part is based on the WeChat applet platform to set up a pre-hospital first-aid dispatching system that connects callers and CPR *** software system effectively improves the pre-hospital CPR first-aid system and increases the rescue success rate of cardiac arrest patients.

关键词： Chest compression CPR Auxiliary equipment WeChat applet

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Effect of Varying Temperature and Oxygen on Particulate Matter Formation in Oxy-Biomass Combustion

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Energy Engineering 2022年第3期119卷 863-881页

作者： chen Wang Cicilia Kemunto Mesa Samuel Bimenyimana Nathan Bogonko George Adwek Yiyi Mo Godwin Norense Osarumwense Asemota Changfu Yuan yaowen chen Changtai Li Etienne Ntagwirumugara Aphrodis Nduwamungu Fujian Provincial Higher–Educational Engineering Research Centre of Intelligence and Automation in Construction College of Civil EngineeringHuaqiao UniversityXiamenChina Kenya Industrial Research and Development Institute NairobiKenya Hello Renewables Ltd.KigaliRwanda Mount Kenya University ThikaKenya African Centre of Excellence in Energy for Sustainable Development University of RwandaKigaliRwanda Morayo College NairobiKenya Fujian Baichuan Construction Technology Co. Ltd.XiamenChina Haoqi(Xiamen)Construction Technology Co. Ltd.XiamenChina University of Rwanda College of Science and TechnologyKigaliRwanda

Offsetting particulate matter emissions has become a critical global aim as there are concerted efforts to deal with environmental and energy poverty *** study consists of investigations of computing emissions of particulate matter from biomass fuels in various atmospheres and *** laboratory setup included a fixed bed electric reactor and a particulate matter(PM)measuring machine interfaced with the flue gas from the fixed bed reactor combustion *** experiments were conducted at seven different temperatures(600℃-1200℃)and six incremental oxygen concentrations(21%-100%).Five biomass types were studied;A-cornstalk,B-wood,C-wheat straw,D-Rice husk,E-Peanut shell,each pulverized to a size of approximately 75 *** study shows that PM emitted during char combustion is consistently higher than that emitted during the *** de-volatilization,increase in temperature leads to linear decrease in PM emission between atmospheres of 21%O_(2)to 50%O_(2),thereafter,between 70%O_(2)to 100%O_(2);increase in temperature leads to a rise in PM *** average PM formation from all the five considered biomass is relatively comparable however,with differing atmospheres and temperatures,the fibrous and low-density biomass forms more *** char combustion,the study shows that at oxygen levels of 21%,70%,90%and 100%,increase in temperature leads to increased PM *** increase in oxygen concentration and temperature increases the rate of combustion hence diminishing the time of combustion.

关键词： Oxy-fuel combustion particulate matter(PM) volatiles char combustion

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Nuclear magnetic resonance spectroscopy is highly sensitive for lipid-soluble metabolites

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Neural Regeneration Research 2013年第22期8卷 2103-2110页

作者： Haiyang Dai Bikai Hong Zhifeng Xu Lian Ma yaowen chen Yeyu Xiao Renhua Wu Department of Medical Imaging Second Affiliated HospitalShantou University Medical College Department of Medical Imaging Huizhou Municipal Central Hospital Department of Radiology the First People's Hospital of Foshan Department of Pediatrics Second Affiliated HospitalShantou University Medical College Central Laboratory Shantou University

Although the water-soluble metabolite profile of human mesenchymal stem cells is known, the lipid profile still needs further investigation. In this study, methanol-chloroform was used to extract lipid-soluble metabolites and perchloric acid was used to extract water-soluble metabolites. Fur- thermore, a dual phase extraction method using methanol-chloroform and water was used to obtain both water and lipid fractions simultaneously. All metabolite extractions were analyzed on a 9.4T high-resolution nuclear magnetic resonance spectrometer. Metabolite resonance peaks were as- signed in the acquired spectra according to the chemical shift, and the extraction efficiency of dif- ferent methods was compared. Results showed that in the spectra of water-soluble extracts, major metabolites comprised low molecular weight metabolites, including lactate, acetic acid, fatty acids, threonine, glutamic acid, creatine, choline and its derivatives, while in the spectra of lipid-soluble extracts, most metabolites were assigned to fatty acids. Among the different extraction procedures, perchloric acid was more efficient in extracting water-soluble metabolites and methanol-chloroform was efficient in extracting organic components compared with the dual phase extraction method. Nuclear magnetic resonance spectroscopy showed that as low as 0.7 mg organic yield was enough to obtain clear resonance peaks, while about 6.0 mg water-soluble yield was needed to obtain rela- tively favorable spectral lines. These results show that the efficiency of extracting water and lipid fractions is higher using perchloric acid and methanol-chloroform compared with dual phase ex- traction and that nuclear magnetic resonance spectroscopy is highly sensitive for analyzing lipid-soluble extracts.

关键词： neural regeneration nuclear magnetic resonance spectroscopy mesenchymal stem cells metabo-lite profiles extraction method optimization water-soluble lipid-soluble perchloric acid metha-nol-chloroform grants-supported paper neuroregeneration

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太阳能富集区零碳建筑技术方案探讨(2):单体公共建筑

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暖通空调 2025年第1期55卷 80-86页

作者：默哲龙王登甲陈耀文多庆巴珠刘艳峰焦青太张井山周勇西安建筑科技大学西安710055 绿色建筑全国重点实验室西安拉萨市设计集团有限公司拉萨日出东方太阳能控股股份有限公司连云港

在青藏高原太阳能富集区,结合单体公共建筑的实际使用特征和建筑用电用热需求,选择适宜的零碳技术方案是避免技术无序推广、无效投资的关键。本文分析了高原办公楼、村委会等小型单体公共建筑的用能特点及现状,提出了2种适宜的太阳能零... 详细信息

在青藏高原太阳能富集区,结合单体公共建筑的实际使用特征和建筑用电用热需求,选择适宜的零碳技术方案是避免技术无序推广、无效投资的关键。本文分析了高原办公楼、村委会等小型单体公共建筑的用能特点及现状,提出了2种适宜的太阳能零碳技术方案及设计要点,结合工程案例对所述零碳技术方案进行了探讨,相关内容可为太阳能富集区单体公共建筑零碳化运行及太阳能技术应用示范提供参考借鉴。

关键词：青藏高原太阳能零碳建筑公共建筑技术方案

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“双循环”新发展格局下升级“一带一路”金融支撑体系研究

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国际贸易 2021年第1期 67-73页

作者：陈瑶雯广西大学国际学院中国-东盟信息港大数据研究院

金融是现代经济的血脉,"一带一路"的顺利实施需要强有力的金融支持。在"双循环"新发展格局下,"一带一路"建设面临着新的契机和挑战,必须升级"一带一路"金融支撑体系以更好地满足企业的投融资需求。文章通过分析"一带一路"金融支撑体系... 详细信息

金融是现代经济的血脉,"一带一路"的顺利实施需要强有力的金融支持。在"双循环"新发展格局下,"一带一路"建设面临着新的契机和挑战,必须升级"一带一路"金融支撑体系以更好地满足企业的投融资需求。文章通过分析"一带一路"金融支撑体系建设成效、面临的机遇和挑战,进而提出"双循环"新发展格局下升级"一带一路"金融支撑体系的具体实施建议。应该从提升金融机构体系、健全金融市场体系、创新金融产品体系、完善金融基础设施体系、构建金融风险防范体系、重塑金融治理体系等方面着手构建"一带一路"金融支撑体系升级版。

关键词：双循环一带一路金融支撑体系

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Modelling and Optimization of Clean and Affordable Electricity Solution for Small-Scale Savings and Credit Cooperatives(SACCOs)

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Energy Engineering 2023年第4期120卷 791-810页

作者： Xiaomei Lin Samuel Bimenyimana chenWang Godwin Norense Osarumwensa Asemota Jeanne Paula Ihirwe Aphrodis Nduwamungu Etienne Ntagwirumugara Athanase Gace Changfu Yuan yaowen chen Changtai Li Shilpi Bora YiYi Mo Jiyu Lai Mabao Wu Yong Tang Merit M.Huang College of Science and Technology The Open University of FujianFuzhou350013China Intelligence and Automation in Construction Provincial Higher–Educational Engineering Research Centre Huaqiao UniversityXiamen361021China African Centre of Excellence in Energy for Sustainable Development University of RwandaKigali4285Rwanda Morayo College Nairobi999070Kenya Department of Economics and Management Hebei University of TechnologyTianjin300401China College of Science and Technology University of RwandaKigali4285Rwanda Fujian Baichuan Construction Technology Co. Ltd.HuliXiamen361021China Haoqi(Xiamen)Construction Technology Co. Ltd.HaicangXiamen361021China School ofDesign Ajeenkiya D Y PatilUniversityPune412105India College of Civil Engineering Huaqiao UniversityXiamen361021China College of Transportation and Civil Engineering Fujian Agriculture and Forestry UniversityFuzhou350100China Highway Southeast Engineering Co. Ltd.Xiamen361100China Fuzhou Sinotom Information Technology Co. Ltd.Fuzhou350001China

Renewable energy exploitation is among the development strategies set by the government of Rwanda on the roadmap to 2023/2024 universal electricity access and theUnitedNations plans by *** previous studies oncleanenergy technologies inRwandahavemostly focusedonhouseholds’usagebut there are currentlynostudies describing the feasibility of clean energy technologies for financial *** skepticism on renewable energy in Africa was previously reported by some *** realized that most SACCOs(Savings and Credit Co-Operatives)in Rwanda use diesel technology for backup/emergency electricity supply,taking consideration of abundant solar resources in Rwanda,having seen the viability and feasibility studies from other countries of renewable energy for different institutions(financial included);thiswork uses theHOMEREnergy Software and the electricity load profile of a typical SACCO in Rwanda to analyse the affordability and viability of on-site renewable energy generation for SACCO in *** results reveal that a solar PV systemwith storage can be the optimal solution(with levelized cost of electricity(LCOE)of 0.713$/kWh which is cheaper than 0.73$/kWh for diesel technology)for SACCOs located in both off-grid areas and grid-connected areas(with 0.041$/kWh LCOE which is lower than the current electricity tariff in Rwanda).The findings in this work can serve as basic tools/materials for policy drafters in Rwanda on how financial institutions can contribute to climate change mitigation through self-renewable energy exploitation.

关键词： HOMER energy solar energy SACCO in Rwanda climate change mitigation

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中国对RCEP国家数字服务贸易的出口潜力探究

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当代经济管理 2024年第4期46卷 63-70页

作者：莫馥宁陈瑶雯广西大学经济学院广西南宁530004 广西民族大学东盟学院广西南宁530006

文章基于OECD数据库中的数字服务贸易数据,采用随机前沿引力模型及非效率模型研究了2005—2019年间中国出口RCEP成员国的数字服务贸易潜力以及影响因素。研究发现:中国与贸易伙伴的经济规模、中国人口规模,以及是“一带一路”国家等变... 详细信息

文章基于OECD数据库中的数字服务贸易数据,采用随机前沿引力模型及非效率模型研究了2005—2019年间中国出口RCEP成员国的数字服务贸易潜力以及影响因素。研究发现:中国与贸易伙伴的经济规模、中国人口规模,以及是“一带一路”国家等变量均有利于中国数字服务贸易的出口,贸易伙伴国家的人口规模则不利于中国数字服务贸易的出口,而距离对服务贸易的影响并不显著。贸易伙伴的知识保护水平、互联网发展水平、关税自由度、财政自由、金融自由度,以及政府支出均有利于降低贸易非效率项,而商业自由度的提升则会对贸易效率水平有显著的阻碍作用。从实际贸易额来看,当前我国对RCEP中发达国家的数字出口潜力整体大于发展中国家,但对于泰国、印度尼西亚和马来西亚的出口也存在较大的贸易潜力。因此当前中国的数字服务贸易需要积极实施市场多元化战略,关注出口国的基础设施和知识产权法的现行施行水平,打通与贸易伙伴国的数据共享和系统共认渠道,不断提升RCEP框架下的贸易红利。

关键词：数字服务贸易随机引力模型贸易出口 RCEP

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东中西部经济增长速度与质量水平互动机制研究——基于金融资源配置效率和TFP的关联视角

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山东社会科学 2019年第5期 118-124页

作者：杨友才陈耀文青岛科技大学经济与管理学院山东青岛266100

利用2000-2015年的省际面板数据,基于金融资源配置效率和TFP的关联视角,对东中西部经济增长速度和经济质量水平的互动机制进行考察研究,并在运用PVAR模型分析的基础上比较了东中西部关联机制的差异。研究结果表明:从脉冲响应分析来看,... 详细信息

利用2000-2015年的省际面板数据,基于金融资源配置效率和TFP的关联视角,对东中西部经济增长速度和经济质量水平的互动机制进行考察研究,并在运用PVAR模型分析的基础上比较了东中西部关联机制的差异。研究结果表明:从脉冲响应分析来看,东部地区的经济增长速度和质量发展水平对于各种冲击效果不显著;中部地区的经济增长速度对经济质量水平的冲击为负向,质量水平对增长速度的冲击方向为先负后正;西部地区的冲击方向与中部存在很大差别,增长速度对质量水平的冲击为正向,质量水平对增长速度的冲击持续为负。从要素贡献率来看,虽然东中西部的增长速度对质量水平贡献率差异不大,但质量水平对增长速度的贡献率同样呈现东部最高,中部次之,西部最低的趋势。

关键词：金融资源配置效率 TFP 经济增长速度经济发展质量水平

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