检索结果-南通市图书馆

Cooperative Optimization of Reconfigurable Machine Tool Configurations and Production Process Plan

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2012年第5期25卷 982-989页

作者： XIE Nan li Aiping xue Wei Sino-German College of Applied Science Tongji University Shanghai 201804 China Institute of AdvancedManufacturing Technology Tong/i University Shanghai 201804 China College of Mechanical & Electrical Engineering Wenzhou University Wenzhou 325000 China

The production process plan design and configurations of reconfigurable machine tool （RMT） interact with each other. Reasonable process plans with suitable configurations of RMT help to improve product quality and reduce production cost. Therefore, a cooperative strategy is needed to concurrently solve the above issue. In this paper, the cooperative optimization model for RMT configurations and production process plan is presented. Its objectives take into account both impacts of process and configuration. Moreover, a novel genetic algorithm is also developed to provide optimal or near-optimal solutions： firstly, its chromosome is redesigned which is composed of three parts, operations, process plan and configurations of RMTs, respectively; secondly, its new selection, crossover and mutation operators are also developed to deal with the process constraints from operation processes （OP） graph, otherwise these operators could generate illegal solutions violating the limits; eventually the optimal configurations for RMT under optimal process plan design can be obtained. At last, a manufacturing line case is applied which is composed of three RMTs. It is shown from the case that the optimal process plan and configurations of RMT are concurrently obtained, and the production cost decreases 6.28% and nonmonetary performance increases 22%. The proposed method can figure out both RMT configurations and production process, improve production capacity, functions and equipment utilization for RMT.

关键词： reconfigurable manufacturing system reconfigurable machine tool configuration process plan cooperative optimization model

An Algorithm for the Discretization of an Ideal Projector

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2016年第5期29卷 1400-1410页

作者： JIANG xue ZHANG Shugong li Zhe Institute of Mathematics Key Laboratory of Symbolic Computation and Knowledge Engineering (Ministry of Education) Jilin University Department of Applied Mathematics School of Science Changchun University of Science and Technology

Ideal interpolation is a generalization of the univariate Hermite interpolation. It is well known that every univariate Hermite interpolant is a pointwise limit of some Lagrange ***, a counterexample provided by Shekhtman Boris shows that, for more than two variables,there exist ideal interpolants that are not the limit of any Lagrange interpolants. So it is natural to consider: Given an ideal interpolant, how to find a sequence of Lagrange interpolants(if any) that converge to it. The authors call this problem the discretization for ideal interpolation. This paper presents an algorithm to solve the discretization problem. If the algorithm returns "True", the authors get a set of pairwise distinct points such that the corresponding Lagrange interpolants converge to the given ideal interpolant.

关键词： Discretization ideal interpolation Lagrange interpolation.

Anaerobic oxidation of methane coupled to sulfate reduction: Consortium characteristics and application in co-removal of H_2S and methane

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2019年第2期31卷 238-248页

作者： lin li Song xue Jingru Xi State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of Sciences National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of Sciences State Key Laboratory of Applied Microbiology Southern China Guangdong Institute of MicrobiologyGuangdong Academy of Sciences

Anaerobic sludge from a sewage treatment plant was used to acclimatize microbial colonies capable of anaerobic oxidation of methane(AOM) coupled to sulfate reduction. Clone libraries and fluorescence in situ hybridization were used to investigate the microbial ***-reducing bacteria(SRB)(e.g., Desulfotomaculum arcticum and Desulfobulbus propionicus)and anaerobic methanotrophic archaea(ANME)(e.g., Methanosaeta sp. and Methanolinea sp.)coexisted in the enrichment. The archaeal and bacterial cells were randomly or evenly distributed throughout the consortia. Accompanied by sulfate reduction, methane was oxidized anaerobically by the consortia of methane-oxidizing archaea and SRB. Moreover, CH_4 and SO_4^(2-) were consumed by methanotrophs and sulfate reducers with CO_2 and H_2S as products. The H_3CSH produced by methanotrophy was an intermediate product during the process. The methanotrophic enrichment was inoculated in a down-flow biofilter for the treatment of methane and H_2S from a landfill site. On average, 93.33% of H_2S and 10.71% of methane was successfully reduced in the biofilter. This study tries to provide effective method for the synergistic treatment of waste gas containing sulfur compounds and CH_4.

关键词： Anaerobic methane oxidation Sulphate reduction Microbial population 13C isotope-labelling Potential pathway Landfill gas

Three-dimensional seismic isolation bearing and its application in long span hangars

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2013年第1期12卷 55-65页

作者： li Xiongyan xue Suduo Cai yancheng The College of Architecture and Civil Engineering Beijing University of Technology Department of Civil Engineering The University of Hong Kong

Based on the seismic response characteristics of space frame structures,a new type of seismic isolation bearing defined as a three-dimensional seismic isolation bearing（3DSIB） is developed in this *** bearing offers excellent properties such as multi-dimensional seismic isolation,reasonable rotation capability,good ability to resist lifting load,uncoupled stiffness in horizontal and vertical directions,*** the 3DSIB,the horizontal dimension is designed by combining the Teflon sliding device and helical spring,while the vertical dimension is developed by introducing disk springs or helical *** mathematical model of the 3DSIB was established and its performance with the critical parameters was tested on a shaking ***,the 3DSIB was applied in a 120 m span hangar structure and simulated using SAP2000 software to evaluate its performance in practical *** performance of the structures with and without 3DSIB was *** is shown that the hangar structure with 3D bearings achieves a better *** axial force and acceleration response of the structures with 3DSIB are effectively reduced,while the displacement response of the bearing is within the predetermined range.

关键词： three-dimensional seismic isolation bearing (3DSIB) seismic isolation hangar axial force acceleration response

First-principles kinetics study of carbon monoxide promoted Ostwald ripening of Au particles on FeO/Pt(111)

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2019年第3期28卷 108-113页

作者： Sulei Hu Runhai Ouyang Wei-xue li State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Department of Chemical Physics School of Chemistry and Materials ScienceiCHeMCAS Excellence Center for NanoscienceUniversity of Science and Technology of ChinaHefei 230026AnhuiChina Hefei National Laboratory for Physical Sciences at the Microscale Hefei 230026AnhuiChina University of Chinese Academy of Sciences Beijing 100049China

The dynamic and kinetic evolution of supported metal particles in the presence of reactants is decisive in shaping the nature of the catalytic active sites and the deactivation process. Ostwald ripening of FeO/Pt(111) supported Au particles in the presence of carbon monoxide is addressed here by firstprinciples kinetics. It is found that CO stabilizes the ripening monomer(Au atom) by forming favorable Au carbonyls with lower total activation energy, and corresponding phase diagram at wide range of temperature and CO pressures is constructed. Evolution of particle number, dispersion and particle size distribution of supported Au particles are explored. Great influence of CO promotion on ripening kinetics is revealed and explored in details, and mbar range of CO can lower the onset temperature of ripening by a few hundred kelvins. The present work reveals the crucial role of the metal-reactant complexes formed under reaction conditions on ripening of metal catalysts.

关键词： Carbon monoxide Au particles Ostwald ripening First-principles kinetics FeO/Pt(111)

Discovery of micromammalian fauna of Sichuan-Guizhou Area in Lantian, Shaanxi

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第4期43卷 336-339页

作者： li Chuanling xue Xiangxu NW Univ Xian Dept Geol Inst Cenozoic Geol & Environm Xian 710069 Peoples R China

The study of the Xishuidong micromammalian fauna, found from Lantian, Shaanxi Province, indicates that both the northern slope of the Qinling Mountains and Sichuan_Guizhou area must belong to the same Oriental Realm in middle_late Middle Pleistocene. The age of the Xishuidong fauna should be later than that of the Gongwangling fauna, and even a little later than that of the Zhongjiawo fauna in age. The fauna is related not only to that of layers 9 and 8 of Peking Man Locality in northern China, but also to the micromammals from Hexian Man Locality in southern China.

关键词： Sichuan_Guizhou Area Lantian of Shaanxi micromammalian fauna Middle Pleistocene.

A Preliminary Study on the Intensity of Cold Wave Storm Surges of Laizhou Bay

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2016年第6期15卷 987-995页

作者： li xue DONG Sheng College of Engineering Ocean University of China

Abstract Dike failure and marine losses are quite prominent in Laizhou Bay during the period of cold wave storm surges because of its open coastline to the north and fiat topography. In order to evaluate the intensity of c01d wave storm surge, the hindcast of ma- rine elements induced by cold waves in Laizhou Bay from 1985 to 2004 is conducted using a cold wave storm surge-wave coupled model and the joint return period of extreme water level, concomitant wave height, and concomitant wind speed are calculated. A new criterion of cold wave storm surge intensity based on such studies is developed. Considering the frequency of cold wave, this paper introduces a Poisson trivariate compound reconstruction model to calculate the joint return period, which is closer to the reality. By using the newly defined cold wave storm surge intensity, the ＇cold wave grade＇ in meteorology can better describe the severity of cold wave storm surges and the warning level is well corresponding to different intensities of cold wave storm surges. Therefore, it provides a proper guidance to marine hydrological analysis, disaster prevention and marine structure design in Laizhou Bay.

关键词： Laizhou Bay cold wave grade Poisson trivariate compound reconstruction model cold wave storm surge intensity

Ignition of neutrino-dominated accretion disks

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2012年第2期55卷 316-319页

作者： liU Tong xue li Department of Physics and Institute of Theoretical Physics and Astrophysics Xiamen UniversityXiamen 361005China

The vertical structure of neutrino-dominated accretion flows （NDAFs） in spherical coordinates is revisited. We define the ratio of the neutrino cooling rate to the viscous heating rate per unit volume, f=-qJqvis. The ignition region is presented when f〉0.5. The solutions show that NDAF is significantly thick. The ignition region is determined by the mass accretion rate and the vis- cosity parameter, which can be considered as the neutrino radiation-dominated region.

关键词： accretion accretion disks-black hole physics-gamma rays: bursts

Theoretical Study of Reaction Mechanism of 1-Propenyl Radical with NO

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第3期21卷 239-244页

作者： xue-li Cheng yan-yun Zhao Feng li Ren-tao Wu Department of Chemistry Taishan University Tai'an 271021 China Department of Chemistry Qufu Normal University Qufu 273155 China Department of Physics Taishan University Tai'an 271021 China

The reaction system of 1-propenyl radical with NO is an ideal model for studying the intermolecular and intramolecular reactions of complex organic free radicals containing C=C double bonds. On the basis of the full optimization of all species with the Gaussian 98 package at the B3LyP/6- 311＋＋G^＊＊ level, the reaction mechanism was elucidated extensively using the vibrational mode analysis. There are seven reaction pathways and five sets of small molecule end products： CH2O＋CH3CN, CH2CHCN＋H2O, CH3CHO＋HCN, CH3CHO＋HNC, and CH3CCH＋HNO. The channel of C3H5-＋NO→IM1→TS1→IM2→TS2→IM3→TS3→CH3CHO＋HCN is thermodynamically most favorable.

关键词： Reaction mechanism 1-Propenyl radical NO Vibrational mode analysis