检索结果-南通市图书馆

Magnetic force improvement and parameter optimization for magnetic abrasive polishing of AZ31 magnesium alloy

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2008年第A1期18卷 369-373页

作者： S.O.kim j.S.KWAK Graduate School of Mechanical Engineering Pukyong National UniversitySouth Korea School of Mechanical Engineering Pukyong National UniversitySouth Korea

The magnetic force acting on workpiece to be machined plays a significantly important role in magnetic abrasive polishing *** in a case of polishing nonferrous materials,the strength of magnetic force is very low and it leads lower polishing *** magnesium alloy that has superior mechanical properties for industrial application such as a lightweight and high specific strength is one of the most famous nonferrous *** improving strategy of the magnetic force for the AZ31 magnesium alloy installed with a permanent magnet was proposed and experimental verification was carried *** the proposed strategy,the effect of process parameters on the surface roughness of the AZ31 magnesium alloy was evaluated by a design of experimental method.

关键词：镁合金物理性能磁力最优化设计磁性

Benefits of Stochastic Optimization for Scheduling Energy Storage in Wholesale Electricity Markets

在线全文

学校读者我要写书评

暂无评论

journal of Modern Power Systems and Clean Energy 2021年第1期9卷 181-189页

作者： Hyeong jun kim Ramteen Sioshansi Antonio j.Conejo the Department of Integrated Systems Engineering The Ohio State UniversityColumbusOhioUSA the Department of Electrical and Computer Engineering The Ohio State UniversityColumbus.OhioUSA

We propose a two-stage stochastic model for optimizing the operation of energy storage. The model captures two important features: uncertain real-time prices when day-ahead operational commitments are made;and the price impact of charging and discharging energy storage. We demonstrate that if energy storage has full flexibility to make real-time adjustments to its day-ahead commitment and market prices do not respond to charging and discharging decisions, there is no value in using a stochastic modeling framework, i.e., the value of stochastic solution is always zero. This is because in such a case the energy storage behaves purely as a financial arbitrageur day ahead, which can be captured using a deterministic *** show also that prices responding to its operation can make it profitable for energy storage to "waste" energy, for instance by charging and discharging simultaneously, which is normally sub-optimal. We demonstrate our model and how to calibrate the price-response functions from historical data with a practical case study.

关键词： Energy storage stochastic optimization value of stochastic solution electricity market

Development of mathematical model with a genetic algorithm for automatic arc welding process

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2010年第3期23卷 230-240页

作者： D.T.Thao I.S.kim j.W.j.ong j.H.Lee j.Y.Shim H.H.kim Department of Mechanical Engineering Mokpo National University

This paper is to represent new algorithms to predict process parameters on top-bead width in robotic gas metal arc（GMA） welding *** models have been developed：linear, curvilinear and intelligent model based on full factorial design with two *** analysis was employed for optimization of the coefficients of linear and curvilinear models, while genetic algorithm（GA） was utilized to estimate the coefficients of an intelligent *** only the fitting of these models were checked and compared by using a variance test（ANOVA）, but also the prediction on top-bead width using the developed models were carried out based on the additional *** developed models were employed to investigate the characteristic between process parameters and top-bead *** solutions and graphical representation showed that the intelligent model developed can be employed for prediction of bead geometry in GMA welding process.

关键词： Top-bead width Genetic algorithm Multiple regression Robotic arc welding GMA welding

Polymersome formation by solvent annealing-induced structural reengineering under 3D soft confinement

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第12期14卷 4644-4649页

作者： Xi Mao Hao Li jinwoo kim Shuai Deng Renhua Deng Bumjoon j.kim jintao Zhu Key Laboratory of Material Chemistry for Energy Conversion and Storage of Ministry of Education(HUST) and State Key Laboratory of Materials Processing and Die&Mold TechnologySchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)Wuhan430074China Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea

A solvent annealing-induced structural reengineering approach is exploited to fabricate polymersomes from block copolymers that are hard to form vesicles through the traditional solution self-assembly *** specifically,polystyrene-b-poly(4-vinyl pyridine)(PS-b-P4VP)particles with sphere-within-sphere structure(SS particles)are prepared by three-dimensional(3D)soft-confined assembly through emulsion-solvent evaporation,followed by 3D soft-confined solvent annealing upon the SS particles in aqueous dispersions for structural engineering.A water-miscible solvent(e.g.,THF)is employed for annealing,which results in dramatic transitions of the assemblies,e.g.,from SS particles to *** approach works for PS-b-P4VP in a wide range of block ***,this method enables effective encapsulation/loading of cargoes such as fluorescent dyes and metal nanoparticles,which offers a new route to prepare polymersomes that could be applied for cargo release,diagnostic imaging,and nanoreactor,etc.

关键词： polymersome block copolymer three-dimensional(3D)confinement self-assembly solvent annealing

Data learning and expert judgment in a Bayesian belief network for aiding human reliability assessment in offshore decommissioning risk assessment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

journal of Ocean Engineering and Science 2021年第2期6卷 170-184页

作者： Mei Ling Fam Dimitrios Konovessis XuHong He Lin Seng ong Lloyds Register Singapore 1 Fusionopolis Place09-11 GalaxisSingapore 138522Singapore Singapore Institute of Technology SIT@Dover 10 Dover Drive Singapore 138683Singapore Lloyd’s Register Consulting Landsvaegen 50A17263SundbybergSweden School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

Decommissioning of offshore facilities involve changing risk profiles at different decommissioning *** Belief Networks(BBN)are used as part of the proposed risk assessment method to capture the multiple interactions of a decommissioning *** BBN is structured from the data learning of an accident database and a modification of the BBN nodes to incorporate human reliability and barrier performance *** analysis covers one case study of one area of decommissioning operations by extrapolating well workover data to well plugging and *** analysis from well workover data,of a 5-node BBN provided insights on two different levels of severity of an accident,the’Accident’and’Incident’level,and on its respective profiles of the initiating events and the investigation-reported human *** initial results demonstrate that the data learnt from the database can be used to structure the BBN,give insights on how human reliability pertaining to well activities can be modelled,and that the relative frequencies from the count analysis can act as initial data input for the proposed *** is also proposed that the integrated treatment of various sources of information(database and expert judgement)through a BBN model can support the risk assessment of a dynamic situation such as offshore decommissioning.

关键词： Bayesian belief network Human reliability assessment Expert judgement Data learning

COMMUNICATION TURNS GREEN CONSTRUCTION PLANNING INTO REALITY

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

journal of Green Building 2017年第1期12卷 168-186页

作者： joseph j.kim Christopher W.Goodwin Sunkuk kim Department of Civil Engineering and Construction Management California State University Long Beach International scholar of Department of Architectural Engineering Kyung Hee UniversityKorea Los Angeles Unified School District Los AngelesCAUSA Department of Architectural Engineering Kyung Hee UniversityKorea

Green planning is critically important during the design phases of construction projects but continually gets less attention during *** owners and planners need to understand how communication influences green *** address a gap in the extant research,this paper presents the evaluation results on how sustainability awareness of field supervision personnel impacts the successful completion of school projects by proving that communicating sustainability goals with them is vital for decision-making during the construction stage of the *** paper uses data collected from 162 new school construction projects to compare sustainability design goals with their successful incorporation into completed ***-one project managers and inspectors were surveyed to assess their awareness of key high-performance sustainability requirements that were built into the *** responses from these two groups were compared to examine the positive or negative *** analysis results show that early and continuous communication of sustainability design goals with field supervision personnel has a significant impact on whether those goals are realized when the project is turned over to the owner for *** implementation of sustainability goals not only provides economic benefits from fully exploiting life-cycle costs,but also holds the promise of providing a healthier working environment.

关键词： green buildings building design school buildings project management sustainable development

A Characteristic Non-Reflecting Boundary Treatment in Lattice Boltzmann Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2008年第6期25卷 1964-1967页

作者： kim Dehee kim Hyung Min jHON Myung S VINAY Ⅲ Stephen j. BUCHANAN john Department of Chemical Engineering Carnegie Mellon University 5000 Forbes Ave Pittsburgh PA 15213 USA Division of Mechanical System Design Engineering Kyonggi University Suwon Kyonggi-do Korea Bechtel Bettis Inc West Mifflin PA 15122 USA

In lattice Boltzmann methods, disturbances develop at the initial stages of the simulation, the decay characteristics depend mainly on boundary treatment methods; open boundary conditions such as equilibrium and bounce-back schemes potentially generate uncontrollable disturbances. Excessive disturbances originate from non-physical reflecting waves at boundaries. Characteristic boundary conditions utilizing the signs of waves at boundaries which suppress these reflecting waves, as well as their implementation in the lattice Boltzmann method, are introduced herein. The performance of our novel boundary treatment method to effectively suppress excessive disturbances is verified by three different numerical experiments.

关键词： HYPERBOLIC SYSTEMS EQUATION FLOWS

Metabolites change of Scenedesmus obliquus exerted by AgNPs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

journal of Environmental Sciences 2019年第2期31卷 310-318页

作者： Pu Wang Bo Zhang Hui Zhang Yiliang He Choon Nam ong jun Yang School of Environmental Science & Engineering Shanghai Jiaotong University School of Municipal and Environmental Engineering Lanzhou Jiaotong University NUS Environmental Research Institute National University of Singapore

With increasing emission of silver nanoparticles(AgNPs) into the environment, it is important to understand the effects of ambient concentration of AgNPs. The biological effects of AgNPs on Scenedesmus obliquus, a ubiquitous freshwater microalgae, was evaluated. AgNPs exerted a minor inhibitory effect at low doses. Non-targeted metabolomic studies were conducted to understand and analyze the effect of AgNPs on algal cells from a molecular perspective. During the 48 hr of exposure to AgNPs, 30 metabolites were identified, of which nine had significant changes compared to the control group. These include D-galactose, sucrose, and *** carbohydrates are involved in the synthesis and repair of cell walls. Glycine, an important constituent amino acid of glutathione, increased with AgNP exposure concentration increasing, likely to counteract an increased intracellular oxidative stress. These results provide a new understanding of the toxicity effects and mechanism of AgNPs. These metabolites could be useful biomarkers for future research, employed in the early detection of environmental risk from AgNPs.

关键词： Silver nanoparticles (AgNPs) Scenedesmus obliquus Metabolomics Molecular mechanism

Preparation and evaluation of mixed-mode resins with tryptophan analogues as functional ligands for human serum albumin separation

在线全文

学校读者我要写书评

暂无评论

Chinese journal of Chemical Engineering 2017年第7期25卷 898-905页

作者： Qici Wu Qilei Zhang Shiwen Xu Cheng ong Ge Shanjing Yao Dongqiang Lin Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China

Five tryptophan analogues with a hydrophobic indole ring and an amino group on each molecule were used as functional ligands of mixed-mode resins for human serum albumin(HSA) purification. Their adsorption performance was evaluated and the effects of p H and salt addition on HSA adsorption were studied. The resins prepared showed typical p H-dependent adsorption and the highest adsorption capacity and affinity were found at pH 5.0for all the resins tested. The saturated adsorption capacity was 138.02 mg·g^(-1)with the tryptaminefunctionalized resin, which significantly decreased at p H below 4.0 due to electrostatic repulsion between ligands and HSA. Moreover, the addition of Na Cl or(NH_4)_2SO_4in media reduced HSA adsorption capacity, although the two salts showed different affecting profiles. The tryptamine-functionalized resin showed the best salt-tolerant performance, and its high adsorption capacity was maintained under high salt concentrations. In addition, the five resins prepared showed good adsorption selectivity for recombinant HSA from Pichia pastoris broth. Molecular docking results between tryptamine and HSA indicated that tryptamine was favorable to bind on Site II(indole-binding site) of HSA.

关键词： Adsorption Human serum albumin Mixed-mode chromatography Tryptamine Tryptophan analogue