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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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comprehensive performance Evaluation of Family Farms from the Perspective of Land Transfer——Taking Rudong County as an Example

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Agricultural Science & Technology 2017年第12期18卷 2638-2643页

作者：孙燕张云鹏戴福鑫南京财经大学公共管理学院江苏南京210046 国土资源部海岸带开发与保护重点实验室江苏南京210023 南京工业大学测绘科学与技术学院江苏南京210009

With the reform of agriculture, family farms have become hot spots in the reform of agricultural management system. Taking Rudong County of Jiangsu Province for an example, the land transfer performance of family farms was evalu- ated using the first hand data from field investigation by building an index system for comprehensive performance evaluation of family farm land transfer covering three dimensions of economy, society and ecology. The results show that land transfer in family farm mode has realized the scale management of land, enhanced the agri- cultural level of science and technology, effectively promoted the structural adjust- ment of agriculture and income increase of farmers, advanced the development of eco-agriculture, and achieved good economic and social performances. However, in the development process of family farms, inputs of agro-chemicals, fertilizers and other agro-products have brought about the eco-environmental problems, which are still worth noting.

关键词： Land transfer comprehensive performance Evaluation Family farm Rudong County

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Pre-research on Enhanced Heat Transfer Method for Special Vehicles at High Altitude Based on Machine Learning

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Chinese Journal of Mechanical Engineering 2023年第2期36卷 314-326页

作者： Chunming Li Xiaoxia Sun Hongyang Gao Yu Zhang China North Vehicle Research Institute Beijing 100072China Mechanical Engineering Department Zhejiang University City CollegeHangzhou 310015China

The performance of an integrated thermal management system signi?cantly in?uences the stability of special-purpose vehicles;thus,enhancing the heat transfer of the radiator is of great signi?*** research methods for radiators include?uid mechanics numerical simulations and experimental measurements,both of which are time-consuming and *** the surrogate model to the analysis of the?ow and heat transfer in louvered?ns can effectively reduce the computational cost and obtain more data.A simpli?ed louvered-?n heat transfer unit was established,and computational?uid dynamics(CFD)simulations were conducted to obtain the?ow and heat transfer characteristics of the geometric structure.A three-factor and six-level orthogonal design was established with three structural parameters:angleθ,length a,and pitch L_p of the louvered?*** results of the orthogonal design were subjected to a range analysis,and the effects of the three parametersθ,a,and L_p on the j,f,and JF factors were ***,a proxy model of the heat transfer performance for louvered?ns was established based onthe arti?cial neural network algorithm,and the model was trained with the data obtained by the orthogonal ***,the?n structure with the largest JF factor was *** with the original model,the optimizedmodel improved the heat transfer factor j by 2.87%,decreased the friction factor f by 30.4%,and increased the comprehensive factor JF by 15.7%.

关键词： Louvered fins Numerical simulation Machine learning comprehensive performance

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A comparative study of different online model parameters identification methods for lithium-ion battery

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Science China(Technological Sciences) 2021年第10期64卷 2312-2327页

作者： ZHANG ShuZhi ZHANG XiongWen MOE Key Laboratory of Thermo-Fluid Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China

Precise states estimation for the lithium-ion battery is one of the fundamental tasks in the battery management system(BMS),where building an accurate battery model is the first step in model-based estimation *** date,although the comparative studies on different battery models have been performed intensively,little attention is paid to the comparison among different online parameters identification methods regarding model accuracy,robustness ability,adaptability to the different battery operating conditions and computation *** this paper,based on the Thevenin model,the three most widely used online parameters identification methods,including extended Kalman filter(EKF),particle swarm optimization(PSO),and recursive least square(RLS),are evaluated comprehensively under static and dynamic *** is worth noting that,although the built model’s terminal voltage may well follow a measured curve,these identified model parameters may significantly out of reasonable range,which means that the error between measured and predicted terminal voltage cannot be seen as a gist to determine which model is the most *** evaluate model accuracy more rigorously,battery state-of-charge(SOC)is further estimated based on identified model parameters under static and dynamic *** SOC prediction results show that EKF and RLS algorithms are more suitable to be used for online model parameters identification under static and dynamic tests,***,the random offset is added into originally measured data to verify the robustness ability of different methods,whose results indicate EKF and RLS have more satisfactory ability against imprecisely sampled data under static and dynamic tests,*** model accuracy,robustness ability,adaptability to the different battery operating conditions and computation cost simultaneously,EKF is recommended to be adopted to establish battery model in real application among these three most widely used met

关键词： lithium-ion battery Thevenin model online model parameters identification methods state-of-charge comprehensive performance

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Preparation of montmorillonite modif ied phenolic resin for shell process

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China Foundry 2009年第2期6卷 119-123页

作者： Xiong Jianmin Li Yuancai Wang Wenqing Xia Chun School of Material Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China School of Material Science and Engineering Nanchang Institute of Aeronautical Technology Nanchang 330063 P. R. China

The development of montmorillonite modified phenolic resin under microwave irradiation heating was *** effect of montmorillonite content and stirring time on the structure and morphology of synthetic resin was *** optimum processing procedure was found to be 45 min stirring time with 5.4% montmorillonite ***,the platelet spacing increases with stirring time till montmorillonite exfoliated to nanoscales *** montmorillonite is exfoliated,layered structure at nanoscale can be uniformly distributed in the *** overall performance of montmorillonite modi fied phenolic resin is improved remarkably,such as flow ability,tensile strength and toughness property of resin coated ***,the gelation speed decreased slightly by adding montmorillonite.

关键词： shell process phenolic resin montmorillonite comprehensive performance tensile strength

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Preparation of Lightweight Alumina-silica Castables by Replacing Closed-cell Perlite Aggregates with Coal Gangue Ceramsites

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China's Refractories 2023年第3期32卷 20-25页

作者： ZAN Wenyu MA Beiyue School of Metallurgy Northeastern UniversityShenyang 110819China

Lightweight alumina-silica castables were prepared using closed-cell perlite(2-4 mm),open-cell perlite(4-6 mm)and coal gangue ceramsites(2-5 mm)as aggregates,floating beads(0.3-0.5 mm),sinking beads(0.6-0.8 mm),silica micropowder,α-Al_(2)O_(3) micropowder,zirconia and zircon micropowder as fines,and Secar 71 cement(calcium aluminate cement)as the *** effects of the coal gangue ceramsites addition(0,6%,12%,18%and 24%,by mass)on the properties of the as-prepared lightweight alumina-silica castables were *** results show that:(1)the addition of coal gangue ceramsites can reduce the sintering shrinkage of the specimens and help to improve the strength and thermal shock resistance;(2)the samples with the addition of coal gangue ceramsites can produce pores in the matrix of the sintered samples,which provides enough space for the growth of CA6 complex solid solution and expands the irregular lamellar structure;(3)with the addition of coal gangue ceramsites increasing,the linear shrinkage of the samples heat treated at 1000 or 1200℃firstly reduces and then increases,the bulk density increases and the apparent porosity decreases;the cold compression strength and the thermal shock resistance of the specimens heat treated at 1200℃firstly increase and then ***,the optimal addition of coal gangue ceramsites is 18%.

关键词： alumina-silica castables closed-cell perlite coal gangue ceramsites comprehensive performance

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Research on utilizing recycled plastic to make environment-friendly plywood

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Forestry Studies in China 2010年第4期12卷 218-222页

作者： CUI Ting SONG Kun-lin ZHANG Shuang-bao College of Materials Science and Technology Beijing Forestry University Beijing 100083 P. R. China Research Institute of Wood Industry Chinese Academy of Forestry Beijing 100091 P. R. China

In our study, we replaced traditional adhesives with compounds made with recycled plastic shopping bags in order to make hot-melt plywood using various amounts of plastic film, different hot-pressing temperatures and hot-pressing times. All three variables have an effect on the intensity and water-resistance of plywood. The results show that the bonding strength of plywood does not increase with increasing amounts of plastic film. When the hot-pressing temperature is increased to 150℃, the bonding strength does not necessarily increase any further. At a hot-pressing time of 6 min, the bonding strength reaches a maximum, after which it will decrease. The optimum hot-pressing parameters are as follows： 100 g·m^-2 of recycled plastic, a hot-pressing temperature of 150℃ and a hot-pressing time of 6 min. This study puts forward a new idea of making use of plastic waste, which, ultimately, may solve the problem of formaldehyde emission without damaging the environment. It has enormous potential market applications.

关键词： recycled plastic shopping bags hot-melt plywood hot-pressing parameters comprehensive performance

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The Relationship Between Online Participation and Academic Achievements for Students Majoring in Business English

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Journal of Literature and Art Studies 2021年第11期11卷 906-910页

作者： GUO Yan-lin Columbia University New YorkN.Y.USA

The quantitative method here was applied to study the correlation between online participation and academic *** online participation in this study was represented by the frequency with which students raise their hands in four business English reading classes over a single semester,while academic achievements were measured by the scores of the students in the final *** results showed a moderate positive correlation in two of the four classes of students between their online participation and scores on class ***,there was no correlation in the other two *** there was no strong correlation between online participation and comprehensive performance in this study,it can be inferred that online participation may not likely cause better comprehensive performance in the final examination.

关键词： online participation comprehensive performance online course

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政府医疗卫生投入模式评估与优化路径

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财政与税务 2024年第11期

作者：樊敏杰杨蕊刘源

在政府医疗卫生投入路径多元化的背景下，如何在保证投入规模的前提下合理引导资金流向并对其进行绩效评估，关乎未来政府医疗卫生投入的结构性优化。利用2010-2020年中国家庭追踪调查(CFPS)的面板数据，基于条件混合过程(CMP)两阶段模... 详细信息

在政府医疗卫生投入路径多元化的背景下，如何在保证投入规模的前提下合理引导资金流向并对其进行绩效评估，关乎未来政府医疗卫生投入的结构性优化。利用2010-2020年中国家庭追踪调查(CFPS)的面板数据，基于条件混合过程(CMP)两阶段模型，从“补供方”“补需方”和“强基层”3个层面分别对政府医疗卫生投入的健康绩效、经济绩效和医疗服务供给绩效进行考察。研究结果显示，政府不同流向的资金投入均有利于改善居民健康状况。“补需方”有利于降低自付费用进而降低患者的医疗负担，而“补供方”则会加重患者的医疗负担。“补需方”和“补供方”会显著提升患者的主观医疗评价，而患者的医疗服务利用率提升则主要依靠政府的需方投入和基层投入。异质性结果显示，政府医疗卫生投入在健康绩效和医疗服务供给绩效两个方面存在城乡和区域差异，在农村和中西部地区，“补需方”“补供方”“强基层”对健康绩效和医疗服务供给绩效的提升效应更强。基于此提出增加基层投入力度和“补需方”力度、优化医疗资源配置、完善医疗卫生制度配套措施等优化路径，切实保障居民健康权益。

关键词：医疗卫生政府多维投入综合绩效优化路径 healthcare government's multi-dimensional investment comprehensive performance path optimization

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