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Multiple indicators and analytic hierarchy process(AHP)for comprehensive performance evaluation of exhaust hood

Building Simulation 2022年第6期15卷 1097-1110页

作者： Jing-jing zhao Ruo-ning Chen jia-hua Wang Xue-yi You Tianjin Key Lab of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityTianjinChina Ningbo FOTILE Kitchen Ware Co. Ltd.NingboChina

Indicators are the basis for judging the working performance of exhaust hood and capture performance are usually used as the only *** evaluation index system including three factors of cooking oil fumes(COF)instantaneous capture,health risk impact and thermal comfort was proposed to assess the comprehensive performance of exhaust hood in the present *** primary capture efficiency(PCE)of formaldehyde,the PCE of particulate matter with the diameter less than or equal to 2.5μm(PM_(2.5)),the incremental lifetime cancer risk(ILCR)of formaldehyde,the ILCR of PM_(2.5)and the predicted mean vote(PMV),which can all be quantified with the aid of computational fluid dynamics(CFD),were selected as the *** the analytic hierarchy process(AHP)method was introduced to perform the comprehensive performance evaluation of exhaust *** performance of two exhaust hood structures(grille and orifice type)with three exhaust rates(3000,4000,and 5000 m^(3)/h)in two cooking zones of a university canteen kitchen were *** result showed that the reduction of ILCR of COF exposure is the most important to the performance of exhaust *** comprehensive performance of orifice exhaust hood with exhaust rate of 4000 and 5000 m^(3)/h are optimal;the orifice exhaust hood with exhaust of 3000 m^(3)/h and grille exhaust hood with exhaust rate of 5000 m^(3)/h are moderate;the grille exhaust hood with exhaust rate of 3000 and 4000 m^(3)/h are ***-making priorities based on comprehensive and individual performance are not exactly the same in the two cooking *** is necessary to use the index system to evaluate the comprehensive performance of exhaust hood that considers the impact on human health and thermal comfort.

关键词： evaluation index system analytic hierarchy process comprehensive performance exhaust hood computational fluid dynamics

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Numerical study of free end effect of cylinder with low aspect ratios on vortex induced motion

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Journal of Hydrodynamics 2022年第1期34卷 106-115页

作者： jia-wei He Wei-wen zhao De-cheng Wan yi-qian Wang Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Ocean College Zhejiang UniversityZhoushan316021China School of Mathematical Science Soochow UniversitySuzhou215006China

In this paper,numerical simulation is conducted via our in-house solver,vim-FOAM-SJTU,developed on open-source software,*** around static rigid cylinders and elastically mounted rigid cylinder constrained to free stream with free end are numerically *** significant conclusions are made by analyzing the different results between cases with and without free *** turbulence model is implemented with a shear stress transport-based(SST-based)improved delayed detached eddy simulation(IDDES)approach in the ***,The paper starts with the application of the vim-FOAM-SJTU solver to flow past fixed cylinder with free end at Reynolds number *** numerical results are compared with experimental *** are satisfactory which implies the validity and accuracy of the current computational fluid dynamics(CFD)*** flow visualization in the vicinity of free-end is ***,the solver is utilized to simulate the free end effect associated with the VIM of a cylinder submerged in *** motion responses under different inflow velocities are *** relationship between transverse motion frequency,in-line motion frequency is ***,the effect of the free end on the vortex of the wake field is analyzed by comparing the 3-D vorticity diagrams of the free end *** responses of circular cylinder with or without free end are compared.

关键词： Fluid-structure interaction vim-FOAM-SJTU solver vortex induced motion(VIM) Three-dimensional character

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脉冲场凝胶电泳应用于一起肠炎沙门菌引起的食物中毒调查

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医学动物防制 2021年第2期37卷 149-151页

作者：耿磊贾肇一孙汝春刘晴王颖童辛集市疾病预防控制中心河北052360 河北省疾病预防控制中心河北省传染病病原鉴定分析与流行病学重点实验室

目的应用脉冲场凝胶电泳(pulsed field gel electrophoresis,PFGE)技术,对一起食物中毒分离的肠炎沙门菌进行同源性分析。方法对患者进行流行病学调查,采集患者和食品样本,依照相关国标和指南进行菌株分离、生化鉴定、血清分型、PFGE检... 详细信息

目的应用脉冲场凝胶电泳(pulsed field gel electrophoresis,PFGE)技术,对一起食物中毒分离的肠炎沙门菌进行同源性分析。方法对患者进行流行病学调查,采集患者和食品样本,依照相关国标和指南进行菌株分离、生化鉴定、血清分型、PFGE检测、图谱聚类分析。结果根据患者流行病学调查结果推测可疑食品为咸鸡蛋。自2例患者粪便和1枚咸鸡蛋中共分离到3株肠炎沙门菌,PFGE图谱条带相似性100%。结论本次疫情是由于食用肠炎沙门菌污染的咸鸡蛋而引起的食物中毒。PFGE技术的应用精准地锁定了传染源头,为流行病学调查提供了有力证据,是对传统方法的有力补充。

关键词：肠炎沙门菌食物中毒脉冲场凝胶电泳聚类分析流行病学调查

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河北省儿童感染肺炎链球菌菌型及疫苗覆盖率分析

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现代预防医学 2020年第22期47卷 4102-4104+4109页

作者：何宝花王颖童贾肇一郭映辉王乐雨姜霞孙印旗河北省疾病预防控制中心河北省传染病病原鉴定分析与流行病学重点实验室(筹) 河北省儿童医院

目的对河北省儿童医院分离的410株肺炎链球菌进行分型研究,分析其菌型特点,为控制本地区儿童肺炎链球菌感染和疫苗的正确选择提供依据。方法将菌株进行核酸提取,采用普通PCR方法进行种属鉴定,多重PCR方法进行血清学分型。结果 410株肺... 详细信息

目的对河北省儿童医院分离的410株肺炎链球菌进行分型研究,分析其菌型特点,为控制本地区儿童肺炎链球菌感染和疫苗的正确选择提供依据。方法将菌株进行核酸提取,采用普通PCR方法进行种属鉴定,多重PCR方法进行血清学分型。结果 410株肺炎链球菌(Streptococcus pneumoniae,Spn)菌株大部分分离自2岁以下儿童,占82.68%,2～3岁患儿占11.22%,4～5岁患儿占3.9%,>5岁的患儿仅占2.2%。年龄最大患儿为10岁,最小为37 d。410株Spn菌株中菌型占比前3位的是19F、6A/6B和19A,7价、13价和23价肺炎链球菌疫苗的菌型覆盖率分别是55.61%、71.46%、76.83%。结论本地区儿童肺炎链球菌菌型型别丰富,从疫苗菌株覆盖率和保护性来看,提示13价多糖结合疫苗(13-valent pneumococcal conjugate vaccine, PCV13)对本地区儿童可产生较好的预防效果。

关键词：肺炎链球菌血清型疫苗覆盖率

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Inhomogeneous Deformation of Multilayered Roll-Bonded Brass/Cu Composites

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Acta Metallurgica Sinica(English Letters) 2015年第5期28卷 600-607页

作者： Nan jia Ming-Wei Zhu yi-Ran Zheng Tong He Xiang zhao Key Laboratory for Anisotropy and Texture of Materials (ATM) Northeastern University Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Research Institute Northeastern University

The deformation gradients in multilayered hot roll-bonded composite materials incorporating two dissimilar face-centered cubic metals, i.e., brass and Cu, were investigated by characterizing the deformation microstructure, hardness and texture at different thickness positions of the composites. For the constitutive metals, the center part of each metal sheet forms the substructure containing coarse grains, while the ultrafine grains and significant shear banding form in the outer part. As deformation increases, the cross-interface shear occurs in the Cu sheet of the composites. Then, grain fragmentation, shear banding and dynamic recovery become the main factors that influence hardness of the metal. Moreover, in the co-deformed composites, the interface between brass and Cu plays a role in texture developments of the individual metals.

关键词： Deformation Multilayers Brass/Cu composites Texture

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数字赋能乡村教育现代化的实然困境与优化路径

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教学与管理 2025年第1期 6-11页

作者：王倩吴家华胡恒钊安徽大学马克思主义学院合肥230601 江西农业大学马克思主义学院南昌330045

以数字赋能为发展契机,推进乡村教育现代化是中国式教育现代化的必然要求,也是乡村全面振兴的重要依托。在教育领域,数字技术蕴含着驱动乡村教育现代化发展的重要价值,能够有效扩大优质教育资源的覆盖范围、变革乡村教育形态、推动乡土... 详细信息

以数字赋能为发展契机,推进乡村教育现代化是中国式教育现代化的必然要求,也是乡村全面振兴的重要依托。在教育领域,数字技术蕴含着驱动乡村教育现代化发展的重要价值,能够有效扩大优质教育资源的覆盖范围、变革乡村教育形态、推动乡土文化的交流传播。但在推动数字赋能乡村教育现代化的实践中,面临着数字教育观念淡薄、数字基础条件不足、师生数字素养薄弱等现实阻碍,迫切需要从重塑价值观念、完善数字设施、培养师生数字素养、加强体制建设入手,为数字赋能乡村教育现代化发展注入新动力,以适应中国式教育现代化发展的新生态。

关键词：数字赋能乡村教育中国式教育现代化乡土文化

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An Active Hybrid Electrocatalyst with Synergized Pyridinic Nitrogen-Cobalt and Oxygen Vacancies for Bifunctional Oxygen Reduction and Evolution

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Chinese Journal of Chemistry 2021年第3期39卷 655-660页

作者： Wen-Xin Zhong Xue-Ru zhao jia-yi Qin Jing Yang School of Materials Science and Engineering Institute of New Energy MaterialsTianjin UniversityTianjin 300072China

Main observation and conclusion A hybrid bifunctional oxygen reduction reaction(ORR)/oxygen evolution reaction(OER)NiCo_(2)O_(4-x)/NLG with rich pyridinic-nitrogen-cobalt coordination and oxygen vacancies was synthesized via a combination of the hydrothermal method and pulsed laser ***_(2)O_(4-x)/NLG exhibits an excellent catalytic activity with a low overpotential of 290 mV at 10 ***^(-2)for OER and a high half-wave potential of 0.85 V for *** a result,the overall ORR/OER overpotential ofNiCo_(2)O_(4-x)/NLG is only 0.67 V in 1.0 mol/L KOH electrolyte,which is superior to commercial noble-metal-based catalysts(Pt/C+RuO2).It is evidenced that the enhanced intrinsic OER and ORR activities of NiCo_(2)O_(4-x)/NLG are attributed to a synergistic effect between the pyridinic-N-Co coordination and the oxy-gen *** work provides a new design strategy for enhancing the intrinsic activity of bifunctional ORR/OER electrocatalysts.

关键词： Graphene Heterogeneous catalysis Electrochemistry Oxygen evolution reaction Oxygen reduction reaction

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Identification of surface nanobubbles and resolving their size-dependent stiffness

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Science China(Physics,Mechanics & Astronomy) 2020年第9期63卷 66-76页

作者： YouQuan jia BinYu zhao Abbasali Abouei Mehrizi Chuan Wang yi Xu LongQuan Chen School of Mechanics and Engineering Southwest Jiaotong UniversityChengdu 610031China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China Leibniz Institute of Polymer Research Dresden Dresden 01069Germany

We report a comparative investigation of the topographic features and nanomechanical responses of surface nanobubbles,polymeric nanodrops,and solid microparticles submerged in water and probed by atomic force microscopy in different operating *** show that these microscopic objects exhibit similar topographies,either hemispherical or hemiellipsoidal,in the standard tapping mode,and thus are difficult to ***,distinct differences,caused not only by their different mechanical properties but also by different cantilever tip-sample mechanical interactions that are affected by tip wettability,were observed in successive topographic imaging with controlled scanning forces and the nanoindentation tests,allowing for the identification of surface *** on the indentation force-distance curves,we further extrapolated the stiffness of surface nanobubbles spanning a wide range of sizes and then developed a simple theoretical model to explain this size *** also demonstrate how size-dependent stiffness can be used to determine the surface tension of nanobubbles,which was found to be much lower than the bulk value of water.

关键词： surface nanobubble size-dependent stiffness nanomechanical measurement atomic force microscopy

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A direct electrochemical biosensor for rapid glucose detection based on nitrogen-doped carbon nanocages

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Rare Metals 2024年第5期43卷 2184-2192页

作者： Lan-Lan Li Yu zhao Li-jia Pan jian-Bin Xu yi Shi College of Mechanical and Electrical Engineering Henan Agricultural UniversityZhengzhou 450002China School of Electronic Science and Engineering Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Department of Electronic Engineering The Chinese University of HongKongHongkong 999077China

Given the increasing number of diabetic patients,rapid and accurate detection of glucose in body fluids is *** study developed a direct electrochemical biosensor for glucose based on nitrogen-doped carbon nanocages(NCNCs).NCNCs possess a large specific surface area of 1395 m^(2)·g^(-1),a high N atomic content of 9.37%and good biocompatibility,which is favorable for enzyme loading and electron *** surface average concentration of electroactive glucose oxidase on NCNCs was 2.82×10^(-10)mol·cm^(-2).The NCNC-based direct electrochemical biosensor exhibited a high sensitivity of 13.7μA·(mmol·L^(-1))^(-1)·cm^(-2),rapid response time of 5 s and an impressive electron-transferrate constant(ks)of 1.87 s^(-1).Furthermore,we investigated an NCNC-based direct electron transfer(DET)biosensor for sweat glucose detection,which demonstrated tremendous promise for non-invasive wearable diabetes diagnosis.

关键词： Direct electron transfer(DET) Nitrogen-doped carbon nanocages(NCNCs) Glucose oxidase Biosensor

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Effects of process parameters on nonaqueous gelcasting for copper powder

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International Journal of Minerals,Metallurgy and Materials 2016年第5期23卷 542-547页

作者： Karima Bekouche zhao-li Wang Cheng-Chang jia Bo-wen Liu yi Tang Institute of Advanced Materials and Technology University of Science and Technology Beijing

An approach to fabricate sintered copper with high green strength and high sintered density using nonaqueous gelcasting technol- ogy is presented in this study. The effects of various gelcasting processing parameters such as monomer content, monomer/crosslinker ratio, initiator content, dispersant dosage, and temperature on the flexural strength of dried green bodies and the relative density of sintered bodies were studied to obtain better microstructures and properties. The appropriate process parameters obtained for copper gelcasting are as follows monomer content, 20vol%-30vol% （based on the total volume of reagents）; monomer/crosslinker ratio, 10：1 to 20：1; initiator content, 3vol%-4vol% （based on the volume of the monomer）; dispersant dosage, 1.5wt%-2.5wt% （based on the mass of the copper powder）; and reaction temperature, 65-75℃.

关键词： copper powder gelcasting monomer process parameters flexural strength density

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