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Periodic energy decomposition analysis for electronic transport studies as a tool for atomic scale device manufacturing

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International Journal of Extreme Manufacturing 2020年第1期2卷 164-172页

作者： Paven thomas Mathew Fengzhou Fang Centre of Micro/Nano Manufacturing Technology MNMT-DublinUniversity College DublinIreland State Key Laboratory of Precision Measuring Technology and Instruments Centre of Micro/Nano Manufacturing TechnologyMNMTTianjin UniversityPeople’s Republic of China

Atomic scale manufacturing is a necessity of the future to develop atomic scale devices with high precision.A different perspective of the quantum realm,which includes the tunnelling effect,leakage current at the atomic-scale,Coulomb blockade and Kondo effect,is inevitable for the fabrication and hence,the mass production of these *** these atomic-scale device development,molecular level devices must be *** theoretical studies could be an aid towards the experimental *** transport studies are the basis to realise and interpret the problems happening at this minute *** these in mind,we present a periodic energy decomposition analysis(pEDA)of two potential candidates for moletronics:phthalocyanines and porphyrins,by placing them over gold substrate cleaved at the(111)plane to study the adsorption and interaction at the interface and then,to study their application as a channel between two electrodes,thereby,providing a link between pEDA and electronic transport *** provides information regarding the bond strength and the contribution of electrostatic energy,Pauli’s energy,orbital energy and the orbital *** this analysis with electronic transport studies can provide novel directions for atomic/close-toatomic-scale manufacturing(ACSM).Literature survey shows that this is the first work which establishes a link between pEDA and electronic transport studies and a detailed pEDA study on the above stated *** results show that among the molecules studied,porphyrins are more adsorbable over gold substrate and conducting across a molecular junction than phthalocyanines,even though both molecules show a similarity in adsorption and conduction when a terminal thiol linker is attached.A further observation establishes the importance of attractive terms,which includes interaction,orbital and electrostatic energies,in correlating the pEDA study with the transport *** progressing this re

关键词： phthalocyanine porphyrin potential energy decomposition analysis potential energy surface scan moletronics ACSM Manufacturing III

Abelian quotients and orbit sizes of linear groups

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Science China Mathematics 2020年第8期63卷 1523-1534页

作者： thomas Michael Keller Yong Yang Department of Mathematics Texas State UniversitySan MarcosTX 78666USA Key Laboratory of Group and Graph Theories and Applications Chongqing University of Arts and SciencesChongqing 402160China

Let G be a finite group,and let V be a completely reducible faithful finite G-module(i.e.,G≤GL(V),where V is a finite vector space which is a direct sum of irreducible G-submodules).It has been known for a long time that if G is abelian,then G has a regular orbit on *** this paper we show that G has an orbit of size at least|G/G′|on *** generalizes earlier work of the authors,where the same bound was proved under the additional hypothesis that G is *** completely reducible modules it also strengthens the 1989 result|G/G′|<|V|by Aschbacher and Guralnick.

关键词： abelian quotients orbits of group actions linear groups

Impacts as Triggers for Weather-Related Decision Making: Observations at the Berlin Fire Brigade Control and Dispatch Center

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International Journal of Disaster Risk Science 2021年第4期12卷 610-615页

作者： thomas Kox Catharina Lüder Institute of Computer Science Freie Universität Berlin12165BerlinGermany Hans-Ertel-Center for Weather Research Berlin 12165BerlinGermany Department of Geography Ludwig-Maximilians-Universität München80333MunichGermany

This article presents the results of a series of ethnographic observations at the Berlin fire brigade control and dispatch center during routine and severe weather *** weather-related challenges of a fire brigade lie between the anticipation of events and their potential consequences,and the ad hoc reactions to actual impacts of *** results show that decisions and actions related to high impact weather are not necessarily motivated by weather warnings ***,they are reactions to the experience of impacts,for example,an increased number of missions or emergency *** are the main trigger for the decision *** is one additional external factor that influences the operational capability of a fire *** commanding officers in a fire brigade control and dispatch center experience weather primarily through technical equipment,verified by ground truth,observations showed that direct personal contact with the regional weather service and colleagues on the ground takes on a greater role in actual severe weather *** observations point to the need for increased interagency communication between the emergency services,the weather service,and other organizations to integrate weather information,impacts,and non-weather-related tasks into coherent weather-related decision making.

关键词： Berlin Emergency services Fire brigades Impact-based emergency response Interagency communication Weather-related decision making

Predicting the Outcome of a Tennis Tournament:Based on Both Data and Judgments

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Journal of Systems Science and Systems Engineering 2019年第3期28卷 317-343页

作者： Wei Gu thomas L.Saaty aDonlinks School of Economics and Management University of Science and Technology BeijingBeijing 100083China Distinguished University Professor University of PittsburghPittsburghPA 15260United States

This paper is about predicting the outcome of tennis matches of the Association of Tennis Professionals(ATP)and the Women's Tennis Association(WTA)using both data and *** are many factors that influence that *** important question is which factors have significant influence on the *** have identified numerous factors and systematically prioritized them subjectively and objectively,so as to improve the accuracy of the *** then used them to predict the win-lose outcome of the 2015 US OPEN tennis matches(63 men and 31 women's games)before they took *** tennis match prediction in sports literature thus far reported an accuracy rate of 70%.The accuracy of our proposed model which combines data and judgment reaches 85.1%.

关键词： Prediction tennis data analysis judgment

Damping of Pressure Pulsations in Mobile Hydraulic Applications by the Use of Closed Cell Cellular Rubbers Integrated into a Vane Pump

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Journal of Bionic Engineering 2017年第4期14卷 791-803页

作者： David Bach Tom Masselter thomas Speck Plant Biomechanics Group Freiburg Botanic Garden Faculty of Biology University of Freiburg Schginzlestr. 1 79104 Freiburg Germany Freiburg Materials Research Center (FMF) Stefan-Meier-StraBe 21 79104 Freiburg Germany Competence Networks Biomimetic and BIOKON e. V. Schainzlestr. 1 79104 Freiburg Germany

The present study evaluates the potential of a bio-inspired pulsation damper in a vane pump used in mobile hydraulic ap- plications. Pressure pulsations caused by such positive displacement pumps can lead to malfunctions and noise in a hydraulic system. A common measure to reduce pressure pulsations is the integration of pressure pulsation dampers downstream of the pump. This type of damping measure can also be found in biology as e.g. in the human blood circulatory system. Such working principles found in living organisms offer a high potential for a biomimetic transfer into technical applications. The newly developed bio-inspired damper consists of cellular rubbers with non-linear viscoelastic material properties. In order to evaluate the new damping method, pressure pulsations were measured at two different back pressures and at a wide engine speed range of the vane pump. For further assessment, different setups, varying the stiffness of the cellular rubber materials and the damper volume, were tested. Within the tested back pressures, the pressure pulsations could be reduced by up to 40%. The developed integrated pulsation damper offers a high potential to dampen pressure pulsations of positive displacement pumps used in mobile hydraulic applications ooeratin~ below 10 bar.

关键词： pressure pulsations pressure ripple vane pump bio-inspired pulsation damping cellular rubbers flexible foams

Corrosion behavior of metallic alloys in molten chloride salts for thermal energy storage in concentrated solar power plants： A review

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Frontiers of Chemical Science and Engineering 2018年第3期12卷 564-576页

作者： Wenjin Ding Alexander Bonk thomas Bauer Institute of Engineering Thermodynamics German Aerospace Center (DLR) 70569 Stuttgart Germany Institute of Engineering Thermodynamics German Aerospace Center (DLR) 51147 Cologne Germany

Recently, more and more attention is paid on applications of molten chlorides in concentrated solar power （CSP） plants as high-temperature thermal energy storage （TES） and heat transfer fluid （HTF） materials due to their high thermal stability limits and low prices, compared to the commercial TES/HTF materials in CSP- nitrate salt mixtures. A higher TES/HTF operating temperature leads to higher efficiency of thermal to electrical energy conversion of the power block in CSP, however causes additional challenges, particularly increased corrosiveness of metallic alloys used as contain- ers and structural materials. Thus, it is essential to study corrosion behaviors and mechanisms of metallic alloys in molten chlorides at operating temperatures （500-800℃） for realizing the commercial application of molten chlorides in CSE The results of studies on hot corrosion of metallic alloys in molten chlorides are reviewed to understand their corrosion behaviors and mechanisms under various conditions （e.g., temperature, atmosphere）. Emphasis has also been given on salt purification to reduce corrosive impurities in molten chlorides and development of electrochemical techniques to in-situ monitor corrosive impurities in molten chlorides, in order to efficiently control corrosion rates of metallic alloys in molten chlorides to meet the requirements of industrial applications.

关键词： corrosion mechanisms impurities metallic corrosion salt purification electrochemical techniques

Evolutionary Optimization: Pitfalls and Booby Traps

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Journal of Computer Science & Technology 2012年第5期27卷 907-936页

作者： thomas Weise Raymond Chiong Ke Tang Nature Inspired Computation and Applications Laboratory School of Computer Science and Technology University of Science and Technology of China Hefei 230027 China Faculty of Higher Education Swinburne University of Technology 50 Melba Avenue Lilydale Victoria 3140 Australia

Evolutionary computation （EC）, a collective name rithms, is one of the fastest-growing areas in computer science. for a range of metaheuristic black-box optimization algo- Many manuals and ＂how-to＇s on the use of different EC methods as well as a variety of free or commercial software libraries are widely available nowadays. However, when one of these methods is applied to a real-world task, there can be many pitfalls and booby traps lurking certain aspects of the optimization problem that may lead to unsatisfactory results even if the algorithm appears to be correctly implemented and executed, These include the convergence issues, ruggedness, deceptiveness, and neutrality in the fitness landscape, epistasis, non-separability, noise leading to the need for robustness, as well as dimensionality and scalability issues, among others. In this article, we systematically discuss these related hindrances and present some possible remedies. The goal is to equip practitioners and researchers alike with a clear picture and understanding of what kind of problems can render EC applications unsuccessful and how to avoid them from the start.

关键词： evolutionary computing problem difficulty optimization meta-heuristics

A fully abstract semantics for value-passing CCS for trees

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Frontiers of Computer Science 2019年第4期13卷 828-849页

作者： Ying JIANG Shichao LIU thomas EHRHARD State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China CNRS IRIF UMR 8243 Univ Paris Diderot Sorbonne Paris Cite F-75205 Paris France

We propose a fully abstract semantics for valuepassing CCS for trees (VCCTS) with the feature that processes are located at the vertices of a graph whose edges describe possible interaction capabilities. The operational semantics is given both in terms of a reduction semantics and in terms of a labelled transition semantics. We develop a theory of behavioral equivalences by introducing both weak barbed congruence and weak bisimilarity. In particular, we show that, on image-finite processes, weak barbed congruence coincides with weak bisimilarity. To illustrate potential applications and the powerful expressiveness of VCCTS, we formally compare VCCTS with some well-known models, e.g., dynamic pushdown networks, top-down tree automata and value-passing CCS.

关键词： process calculus non-interleaving semantics barbed congruence bisimulation

Evaluation of the pull-out strength of galvanised steel strips in a cement-based material

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第12期14卷 843-855页

作者： Maziar RAMEZANI Juan VILCHES thomas NEITZERT Centre for Advanced Manufacturing Technology (CAMTEC) School of Engineering Auckland University of Technology

The study of the interfacial and bond behaviour of reinforced cement-based materials is important for understanding the mechanical behaviour of such *** paper presents extensive experimental,theoretical and finite element analyses of pull-out tests of galvanised steel strips with different geometries,in lightweight cement-based material blocks with different densities and mechanical *** theoretical model proposed here is capable of determining the pull-out strength and bond stress versus the slip relationship between components of reinforced cement-based *** bond-slip relationship is then implemented in finite element simulation through the user-defined subroutine of ABAQUS *** on the results,a trilinear bond-slip model is suitable for modelling the interface between a steel strip and a cement-based material interface.

关键词： Bond-slip relationship Cement-based materials Galvanised steel strip Pull-out test