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Nonlinear analysis on electrical properties in a bended composite piezoelectric semiconductor beam

Applied Mathematics and Mechanics(English Edition) 2023年第12期44卷 2039-2056页

作者： luke ZHAO Feng JIN Zhushan SHAO Wenjun WANG School of Science Xi’an University of Architecture and TechnologyXi’an 710055China School of Aerospace Xi’an Jiaotong UniversityXi’an 710049China MOE Key Laboratory for Multifunctional Materials and Structures School of AerospaceXi’an Jiaotong UniversityXi’an 710049China School of Science Lanzhou University of TechnologyLanzhou 730050China

In this paper,the interactions between the transverse loads and the electrical field quantities are investigated based on the nonlinear constitutive *** considering a composite beam consisting of a piezoelectric semiconductor and elastic layers,the nonlinear model is established based on the phenomenological theory and Euler’s beam ***,an iteration procedure based on the differential quadrature method(DQM)is developed to solve the nonlinear governing *** analysis,the convergence and correctness are *** is found that the convergence of the proposed iteration is ***,the transverse pressure induced electrical field quantities are investigated in *** the calculated results,it can be found that the consideration of nonlinear constitutive relation is necessary for a beam undergoing a large *** with the linear results,the consideration of the nonlinear constitutive relation breaks the symmetry for the electric potential,the electric field,and the perturbation carrier density,and has little influence on the electric ***,the non-uniform pressures are *** results show that the distributions of the electric field quantities are sensitively *** indicates that the electrical properties can be manipulated with the design of different transverse *** conclusions in this paper could be the guidance on designing and manufacturing electronic devices accurately.

关键词： nonlinear constitutive relation electrical property composite piezoelectric semiconductor beam differential quadrature method(DQM) iteration

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On the Existence of Robot Zombies and our Ethical Obligations to AI Systems

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Journal of Social Computing 2023年第4期4卷 270-274页

作者： luke R.Hansen the Computer Science Department Stanford UniversityStanfordCA 94305USA

As artificial intelligence algorithms improve,we will interact with programs that seem increasingly *** may never know if these algorithms are sentient,yet this quality is crucial to ethical considerations regarding their moral *** will likely have to make important decisions without a full understanding of the relevant issues and *** this ignorance,we ought to take seriously the prospect that some systems are *** would be a moral catastrophe if we were to treat them as if they were not sentient,but,in reality they are.

关键词： artificial intelligence sentience ethics

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Comparative Analysis of the Determinants of China's State-owned Outward Direct Investment in OECD and Non-OECD Countries

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China & World Economy 2011年第4期19卷 74-91页

作者： luke Hurst Crawford School of Economics and Government The Australian National University

Chinese outward direct investment （ODI） is expanding at an unprecedented rate. The present study augments the understanding of the determinants and drivers of Chinese ODI. It reviews the literature on Chinese 0191 and analyzes investment by state-owned enterprises （SOE） for the period 2003-2008, focusing specifically on the differences between the determinants of Chinese investment in developed （OECD） and developing （non-OECD） economies. In addition, the study assesses the appropriateness of the general framework used for investigating ODI determinants （Dunning＇s eclectic paradigm） to analyze the experience of Chinese SOE. The findings indicate that Dunning＇s eclectic paradigm provides an excellent theoretical framework for analyzing the determinants of Chinese SOE investment in developed countries, and provides a good starting point for analysis of Chinese investment in developing countries. However, Dunning＇s specification requires refinement for developing countries. This paper finds a distinct difference between the motivations for Chinese SOE investment in developed and developing countries.

关键词： China investment determinants outward direct investment state-owned enterprise

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Strategies to promote the maturation of ALS-associated SOD1 mutants: small molecules return to the fold

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Neural Regeneration Research 2019年第9期14卷 1511-1512页

作者： luke McAlary Justin J.Yerbury Illawarra Health and Medical Research Institute WollongongNSWAustralia School of Chemistry and Molecular Bioscience Molecular HorizonsFaculty of ScienceMedicine and HealthUniversity of WollongongNSWAustralia

(Cu)^IIATSM(CuATSM)promotes the proper folding of familial amyotrophic lateral sclerosis(fALS)-associated copper,zinc superoxide dismutase(SOD1):ALS is a progressive neurodegenerative disease that affects motor neurons in the cortex and spinal cord,resulting in paralysis and ultimately *** majority of cases are sporadic and the remainder are fALS where a subset of cases are associated with over 160,mostly missense,mutations in the SOD1 enzyme ***,these mutations impede the correct folding of SOD1 by disrupting either metal binding,disulfide formation,and/or dimerization,leading to the accumulation of misfolded SOD1 which can form the intracellular inclusions observed in patient tissue.

关键词： (Cu)^IIATSM(CuATSM) familial amyotrophic patient tissue

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Examining the intrinsic foot muscles'capacity to modulate plantar flexor gearing and ankle joint contributions to propulsion in vertical jumping

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Journal of Sport and Health Science 2023年第5期12卷 639-647,F0003页

作者： Ross Smith Glen Lichtwark Dominic Farris luke Kelly School of Human Movement and Nutrition Sciences The University of QueenslandBrisbaneQLD 4072Australia Sport and Health Sciences College of Life and Environmental SciencesThe University of ExeterExeterEX12LUUnited Kingdom

Background:During human locomotion,a sufficiently stiff foot allows the ankle plantar flexors to generate large propulsive *** foot stiffness(e.g.,via a carbon plate)increases the ankle’s external moment arm in relation to the internal moment arm(i.e.,increasing gear ratio),reduces plantar flexor muscles’shortening velocity,and enhances muscle force *** contrast,when activation of the foot’s intrinsic muscles is impaired,there is a reduction in foot and ankle work and metatarsophalangeal joint *** speculated that the reduced capacity to actively control metatarsophalangeal joint stiffness may impair the gearing function of the foot at the ***:We used a tibial nerve block to examine the direct effects of the intrinsic foot muscles on ankle joint kinetics,in vivo medial gastrocnemius’musculotendinous dynamics,and ankle gear ratio on 14 participants during maximal vertical ***:Under the nerve block,the internal ankle plantar flexion moment decreased(p=0.004)alongside a reduction in external moment arm length(p=0.021)and ankle joint gear ratio(p=0.049)when compared to the non-blocked *** medial gastrocnemius muscle-tendon unit and fascicle velocity were not different between conditions,the Achilles tendon was shorter during propulsion in the nerve block condition(p<0.001).Conclusion:In addition to their known role of regulating the energetic function of the foot,our data indicate that the intrinsic foot muscles also act to optimize ankle joint torque production and leverage during the propulsion phase of vertical jumping.

关键词： Ankle biomechanics Ankle gearing Foot biomechanicsTagedEnd

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Coupled Eulerian-Lagrangian simulation of a modified direct shearapparatus for the measurement of residual shear strengths

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第5期13卷 1113-1123页

作者： luke Tatnell Ashley P.Dyson Ali Tolooiyan GHD Group Pty.Ltd. TraralgonVIC3844Australia School of Engineering University of TasmaniaHobartTAS7001Australia

The simulation of large-strain geotechnical laboratory tests with conventional Lagrangian finite element method(FEM)techniques is often problematic due to excessive mesh *** multiple reversal direct shear(MRDS)test can be used to measure the residual shear strength of soils in a laboratory ***,modelling and simulation generally require advanced numerical methods to accommodate the large shear strains concentrated in the shear *** reality,when the standard direct shear(DS)apparatus is used,the MRDS method is prone to two major sources of measurement error:load cap tilting and specimen *** sources of error make it difficult or even impossible to correctly determine the residual shear *** paper presents a modified DS apparatus and multi-reversal multi-stage test method,simulated using the coupled Eulerian-Lagrangian(CEL)method in a finite element *** method was successful in evaluating equipment and preventing both load cap tilting and specimen loss,while modelling large-deformation behaviour that is not readily simulated with the conventional FEM or arbitrary Lagrangian-Eulerian(ALE)***,a modified DS apparatus was created for the purpose of analysing mixtures of organic materials found in an Australian *** results obtained from the modified DS CEL model in combination with laboratory tests show a great improvement in the measured residual shear strength profiles compared to those from the standard *** modified DS setup ensures that accurate material residual shear strengths are calculated,a factor that is vital to ensure appropriate soil behaviour is simulated for numerical analyses of large-scale geotechnical projects.

关键词： Coupled Eulerian-Lagrangian(CEL)simulation Residual shear strength Multi-stage Direct shear(DS) Organic content Cohesive soil

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Revealing a Transformation-Induced Plasticity(TRIP)Phenomenon in a Medium-Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2020年第8期33卷 1159-1165页

作者： Ibrahim Ondicho Bernard Alunda Dicken Owino luke Otieno Melody Chepkoech Department of Mechanical Engineering Dedan Kimathi University of TechnologyPrivate Bag-10143NyeriKenya Materials Design and Manufacturing(MADEMA)GroupDedan Kimathi University of TechnologyPrivate Bag-10143Dedan KimathiNyeriKenya Department of Advanced Root Industry Engineering Yuengnam UniversityGyeongsanSouth Korea Department of Mining and Minerals Processing Engineering Taita Taveta UniversityP.O.Box 635-80300VoiKenya Department of Mechanical Engineering Inha UniversityIncheonSouth Korea School of Mechanical Engineering Kyungpook National UniversityDaeguSouth Korea Department of Mechanical Engineering Howard UniversityWashingtonDCUSA

A transformation-induced plasticity phenomenon in Fe65(CoCrMnNi)35 medium-entropy alloy was *** to the X-ray diffraction patterns,the as-cast specimen contains a single-phase face-centered cubic(fcc),while low-temperature annealing at 500℃and 600℃leads to the introduction of a body-centered cubic(bcc)phase as a secondary *** increment of the annealing temperature to above 700℃eliminates the bcc phase,and the microstructure was found to contain a single-phase *** 20%true strain,an fcc-to-bcc phase transformation is observed;whereas,at 28%true strain,an fccto-hcp phase transformation takes place as an additional deformation *** strain-induced phase transformation phenomenon leads to improved tensile properties of this alloy.

关键词： Phase transformation X-ray diffraction Mechanical behavior Microstructure evolution Multicomponent alloys

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Comparative phylogeography and niche modeling for three species complexes of SE China （Paradoxornis spp., Pycnonotus spp., Spizixos spp.）

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Current Zoology 2015年第5期61卷 943-950,I0001-I0004页

作者： luke B. KLICKA luke C. CAMPILLO Joseph D. MANTHEY Yanhua QU Biodiveristy Institute Ecology and Evolutionary Biology University of Kansas Lawrence KS 66049 USA Key Laboratory of Zoological Systematics and Evolution Institute of Zoology Chinese Academy of Sciences Beijing 100101 China

Contrasting multiple organisms with similar contemporary distributions, researchers can identify shared evolutionary patterns and provide historical context for community composition. We used three species complexes with overlapping distributions in Southeastern China and surrounding islands to explore the phylogeographic history of the region. Despite similar geographic distributions, genetic data revealed few congruent patterns, but all complexes displayed genetic divergence for Taiwan Residents populations. Additionally, niche modeling and divergence dating did not find support for diversification associated with the Last Glacial Maximum [Current Zoology 61 （5）： 943-950,2015].

关键词： Phylogeography Niche modeling Paradoxornis Pycnonotus Spizixos

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MessageLens:A Visual Analytics System to Support Multifaceted Exploration of MOOC Forum Discussions

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Visual Informatics 2018年第1期2卷 37-49页

作者： Jian-Syuan Wong Xiaolong"luke”Zhang The Pennsylvania State University USA

Massive Open Online Courses(MOOCs)often provide online discussion forum tools to facilitate learner interaction and *** massive forum messages posted by learners everyday,MOOC forums are regarded as an important source for understanding learners activities and ***,the high volume and heterogeneity of MOOC forum contents make it challenging to analyze forum data effectively from different perspectives of discussions and to integrate diverse information into a coherent understanding of issues of *** this paper,we report a study on the design of a visual analytics tool to facilitate the multifaceted analysis of online discussion *** tool,called MessageLens,aims at helping MOOC instructors to gain a better understanding of forum discussions from three facets:discussion topic,learner attitude,and communication among *** various visualization tools,instructors can investigate learner activities from different *** report a case study with real-world MOOC forum data to present the features of MessageLens and a preliminary evaluation study on the benefits and areas of improvement of the *** research suggests an approach to analyzing rich communication contents as well as dynamic social interactions among people.

关键词： Multifaceted analysis MOOC forum visual analytics

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Managing crop damage caused by house mice(Mus domesticus)in Australia

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Integrative Zoology 2010年第1期5卷 2-14页

作者： Shahram KABOODVANDPOUR luke K.-P.LEUNG Department of Environment Sciences Kurdistan UniversitySanandajKurdistanIran School of Animal Studies University of QueenslandGattonAustralia

A large-scale outbreak of the house mouse populations occurs in grain growing in Australia on average once every four *** densities of mice cause major yield losses to cereal crops,and low to moderate densities of mice also cause some *** predictive models based on rainfall patterns have been developed to forecast mouse *** models carry some uncertainty and the economic value of basing management actions on these models is not *** is the most commonly used method and zinc phosphide and other rodenticide bait are effective in reducing up to 90%of mouse ***-based best farming practice for controlling mice has recently been developed on the basis of long-term field studies of mouse *** effective biological control method has been developed for ***,grain growers still cannot make economically rational decisions to implement control because they do not know the pest threshold density(D_(T))above which the economic benefits of control exceed the economic costs of *** predator-prey theory suggests that understanding the relationship between mouse density and damage is the basis for determining D_(T).Understanding this relationship is the first research priority for managing mouse *** other research priority is to develop a reliable method to estimate unbiased mouse density.

关键词： Australia crop damage Mus domesticus threshold density

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