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SUSTAINABLE MICRO-VILLAGES AND THE CARWOOLA HOUSE PROJECT IN CANBERRA,AUSTRALIA

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Journal of Green Building 2018年第4期13卷 169-190页

作者： Paul barnett Paul barnett Design Group

INTRODUCTION Our needs as social and familial beings change over the course of our lives;however,it has become common practice to build as though these needs remain static through *** needs of a child,young adult,family,middle age and the elderly are dynamic between generations,and adding to these evolving life needs is the crisis of housing affordability.ree decades ago a house could cost 3-4 times an individual’s annual income,today that cost is closer to 10-12 *** response to these chal-lenges,this article explores the concept of Sustainable Micro-Villages,providing insight into a new approach to energy-efficient housing with reference to our case-study project-Carwoola *** Micro-Villages can be defined as a cluster of integrated dwellings,referred to here as Living *** a“single house”on a single site,these micro-villages can be comprised of two or more smaller buildings that provide private dwelling space for a single person,couples,couples with children,parents,elderly,friends and any combination of social *** pods cluster around a natural garden setting,enhanced by waterharvesting,and are connected with covered,open or enclosed links depending on the climate of the *** recent iterations of this type of dwelling also incorporate solar passive design,passive house and green-house *** Australia,new house designs are evaluated as part of an approvals process for their energy rating.1e Australian Building Code requires a minimum 6-star rating,ranging up to 10 stars for any new home to be built.A 6-star rating provides a good level of insulation and energy performance if built correctly,while 10 stars represent the highest level of energy performance and refers to a dwelling that needs no heating or *** Micro-Villages consistently achieve an 8 to 10-star rating by combining Solar Passive Design principles(good orientation,thermal mass and thermal performance)and Passive House Technology(

关键词： Micro Villages Living Pods Naturescapes Solar Passive Passive House Photovoltaics Waterharvesting Biophilia Permaculture Biodynamics Water Storage

Effect of plastic deformation on microstructure and thermoelectric properties of Mg_(2)Sn alloys

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Journal of Magnesium and Alloys 2021年第1期9卷 123-129页

作者： Rameshkumar Varma Sitarama Kada Matthew barnett Institute for Frontier Materials Deakin UniversityGeelongVictoriaAustralia

In the present work,the effect of deformation on microstructure and thermoelectric properties of Mg 2 Sn alloys having excess magnesium concentrations is *** cast alloys were prepared using radio-frequency(RF)induction melting under an argon *** alloys were thermo-mechanically processed via compression at different temperatures to various true *** room temperature,the alloys failed at a true strain of∼13%.However,at elevated temperatures,the alloys were observed to be highly *** alloys compressed at 673 K to a true strain of 1,a prominent substructure *** subgrain size was∼3-5μ*** is believed that the substructure arose from the action of dynamic *** deformation,the thermoelectric performance of alloy prepared with 6.7 wt.%excess Mg was improved compared to the as cast *** can be ascribed to a reduction in the thermal conductivity due to phonon scattering at grain boundaries.

关键词： Magnesium Thermoelectric Deformation Grain size

Shock effects on the upper limit of the collision weld process window

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Advances in Manufacturing 2024年第2期12卷 365-378页

作者： Blake barnett Anupam Vivek Glenn Daehn Department of Materials Science and Engineering The Ohio State UniversityColumbusOH43210USA Army Research Directorate Army Research LaboratoryDEVCOMAberdeen Proving GroundHarfordMD21005USA

The maximum flyer impact velocity based on a dynamic solidification cracking mechanism is proposed to describe the upper limit of collision welding process ***,the upper limit of the weld window is governed by the evolution of dynamic stresses and temperatures at the weld *** formulations for the upper limit of the collision weld window assume that both the flyer and target are made of the same material and approximate stress propagation velocities using the acoustic velocity or the shear wave velocity of the weld ***,collision welding fundamentally depends on the impacts that generate shockwaves in weld members,which can dominate the stress propagation velocities in thin weld ***,this study proposes an alternative weld window upper limit that approximates stress propagation using shock velocities calculated from modified 1-D Rankine-Hugoniot *** shock upper limit is validated against the experimental and simulation data in the collision welding literature,and offers a design tool to rapidly predict more accurate optimal collision weld process limits for similar and dissimilar weld couples compared to existing models without the cost or complexity of high-fidelity simulations.

关键词： Collision welding Solid-state welding Shock impact Weld process modelling Explosive bonding Laser impulse welding(LIW)

Influence of temperature on twinning dominated pop-ins during nanoindentation of a magnesium single crystal

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Journal of Magnesium and Alloys 2022年第1期10卷 183-194页

作者： Jun Cheng Tingting Guo Matthew R.barnett School of Materials and Energy Guangdong University of TechnologyGuangzhouGuangdong 510006China Institute for Frontier Materials Deakin UniversityGeelongVictoria 3216Australia School of Materials Science and Chemical Engineering Xi'an Technological UniversityXi'an cityShaanxi 710021.China

The present paper examines the temperature sensitivity of tensile twinning in a magnesium single crystal during nanoindentation of the prismatic plane. High temperature indentations from 25 ℃ to 250 ℃ were employed on a well polished magnesium single crystal {10-10}plane. For a indentation curve displaying a pop-in, a single twin was seen on the sample surface using Atomic Force Microscopy(AFM)imaging. For indentations that produced no pop-in, no twinning was observed. We thus conclude the pop-in arises from a twinning event in the present case. With increasing temperature, the mean pop-in load(measured from 200 repeat indentations of each testing temperature)drops markedly. This is interpreted by the thermal activation of nucleation of lattice dislocations, which immediately trigger a twinning *** activation analysis yields activation energies that are consistent with this idea. With increasing temperature the pop-ins became deeper and the twins, after further indentation, showed more growth. It is likely that non-basal slip is activated in the stress concentrations that arise during twinning and the thermal activation of this slip accounts for the observed temperature effects. It is concluded that in interpreting the temperature sensitivity of twinning stresses, any associated lattice dislocation activity must be considered.

关键词： Magnesium single crystal Twinning Temperature Nanoindentation

Three-dimensional crystal plasticity and HR-EBSD analysis of the local stress-strain fields induced during twin propagation and thickening in magnesium alloys

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Journal of Magnesium and Alloys 2023年第2期11卷 657-670页

作者： Filip Siska Daria Drozdenko Kristian Mathis Jan Cizek Tingting Guo Matthew barnett Institute of Physics of Materials The Czech Academy of SciencesZizkova 513/22Brno 61662Czech Republic Department of Physics of Materials Faculty of Mathematics and PhysicsCharles UniversityKe Karlovu 5Prague 12116Czech Republic Institute of Plasma Physics The Czech Academy of SciencesZa Slovankou 1782/3Prague 18200Czech Republic Institute for Frontier Materials Deakin UniversityGeelongVictoria 3216Australia

Present work focuses on analysis of the stress and strain fields inside and around the individual {10–12} twin in magnesium alloy. The 3D crystal plasticity model represents twin as an ellipsoidal inclusion surrounded by the matrix. Five different twin thicknesses and three different lateral twin lengths are used for stress/strain analysis. The simulations are complemented with experimental observations using high-resolution electron backscattered diffraction. The simulations and experiments show a similar distribution of the shear stress and the spatial activity of individual slip systems(basal, prismatic, pyramidal). Plasticity induced inside the twin is dominantly caused by the prismatic dislocations slip and does not influence twin back stress which is identical to pure elastic twin. The twin with larger lateral dimension requires lower equilibrium stress which suggests anisotropic twin propagation and increased thickness of such twins. The lateral twin propagation is mostly influenced by prismatic and pyramidal slip in the twin vicinity. The twin thickness can reach a maximal level that is driven by the critical resolved shear stress values for dislocation slip with the significant influence of basal slip.

关键词： Magnesium alloy Twinning FEM Crystal plasticity HR-EBSD

Age and sex differences in niche use at molt and its effect on plumage coloration characteristics in a bird

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Current Zoology 2019年第3期65卷 251-260页

作者： Emilio PAGANI-NUNEZ Craig R.A.barnett Juan Carlos SENAR State Key Laboratory of Biocontrol Department of Ecology/School of Life Sciences Sun Yat-sen University Guangzhou China Department of Zoology Graduate School of Science University of Kyoto Kitashirakawaoiwake-cho Sakio-ku Kyoto Japan Natural History Museum of Barcelona Barcelona Spain

Bird plumage is often very colorful and can communicate the quality of the bearer to conspecifics. These plumage-based signals of quality are composed of multiple pigments (e.g., melanin and carote no ids). Therefore, sex and age classes, which often show marked differe nces in plumage coloration, may have different dietary needs for the different plumage components and this might promote pref ere nces for differe nt dietary niches at different molting stages. However, no study has addressed the role that changes in niche use play in the expression of multiple component plumage signals in birds. We used stable isotope analysis to test the hypothesis that niche use is related to age and sex and to differently cultured plumage patches, yellow carotenoid-based and black melanin-based, in great tits Parus major. We recorded high niche overlap between plumage patches, although δ15N was higher in black than yellow plumage. Niche overlap was relatively low for age classes and relatively high for sex classes, and age classes showed a contrasting pattern of niche overlap between carotenoid- and melanin-based plumages. Moreover,δ13C, but not δ15N, had a significant negative relationship with carotenoid-based plumage, which was only apparent in juveniles. Take n together, our results demonstrate that n iche use had a moderate in fluence on plumage coloration characteristics of great tit individuals, mostly associated with δ13C rather than with δ15N and with age rather than with sex. Therefore, our study is significant because it confirms the releva nee of n iche use duri ng orn ame nt production in free-livi ng birds.

关键词： carotenoids great tits melanin multiple ornaments niche overlap stable isotopes

Studying the Contradiction between National and Municipal Educational Policy through the Lens of Socialism with Chinese Characteristics: Shanghai Experimental School

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Studying the Contradiction between National and Municipal Ed...

作者： Christopher Eugene barnett 华东师范大学

学位级别：硕士

This paper reviews and analyzes Chinese Communist Party political theory in an attempt to explain a contradiction between national educational policy and municipal level practice as revealed by a case study on the Shanghai Experimental School,a primary and secondary public school in *** specifically,this paper reviews Socialism with Chinese characteristics as established by Mao Zedong and expanded upon by Deng Xiaoping,Jiang Zemin,and Hu Jintao to better understand the Shanghai Municipal Education Commission allowing the Shanghai Experimental School to engage in school choice practices while national policy forbids *** in China,educational equality is the guiding national principle of educational *** principle of educational justice can be cited as a priority in the communique of the 6th conference of the Central Committee of the Communist Party of China in 2006,and was further stressed as a guiding principle in educational management by Secretary Hu Jintao's report to the subsequent 17th Congress of the CPC(Zhang 2011).Emphasizing the principle of justice in education was a track to the left after two generations of Chinese Communist Party leaders encouraged decentralization and the liberalization of market forces,starting with Deng Xiaoping's reforms in 1979 and continuing further with Jiang Zemin's *** Zedong might have categorized Hu Jintao's national policy move to the left as a corrective measure addressing the principal aspect of the contradiction between equality and choice in education,which had become sharpened by anarchic market *** scope of the paper,due to events still unfolding,does not cover the administration of Xi *** as mentioned,the Shanghai Municipal Commission of Education allows the Shanghai Experimental School to legally exist in contradiction to national policy,and this paper attempts to make sense of this contradiction primarily by reviewing political theory of the Chinese C

关键词： School Choice Praxis Education Policy Socialism with Chinese characteristics Material Dialectic Contradiction National Municipal

Microglial depletion and repopulation:a new era of regenerative medicine?

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Neural Regeneration Research 2021年第6期16卷 1204-1205页

作者： Alexandra M.barnett Fulton T.Crews Leon G.Coleman Bowles Center for Alcohol Studies The University of North Carolina at Chapel HillSchool of MedicineChapel HillNCUSA Department of Pharmacology The University of North Carolina at Chapel HillSchool of MedicineChapel HillNCUSA Department of Psychiatry The University of North Carolina School of MedicineChapel HillNCUSA

Microglia have multiple functions and phenotypes that can prevent or worsen *** depletion and repopulation methods provide a promising technique for understanding microglial *** utility as therapeutic modalities is now under *** resident immune cells in the central nervous system(CNS),microglia maintain the local environment and promote neuronal ***,persistent proinflammatory signaling due to aberrant microglial activation can be *** is seen in settings such as traumatic brain injury(TBI)(Henry et al.,2020),stroke(Li et al.,2017),and alcohol use disorder(AUD)(Coleman et al.,2020),when the loss of homeostatic control results in persistent proinflammatory signaling that contributes to ongoing neuropathology(Figure 1).Thus,selective replacement of chronically proinflammatory-activated microglia could improve functional outcomes.

关键词： al. pathology depletion

Defect passivation on cast-mono crystalline screen-printed cells

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Frontiers in Energy 2017年第1期11卷 60-66页

作者： Alison WENHAM Lihui SONG Malcolm ABBOTT Iskra ZAFIROVSKA Sisi WANG Brett HALLAM Catherine CHAN Allen barnett Stuart WENHAM School of Photovoltaic and Renewable Energy Engineering University of New South Wales Sydney NSW 2052 Australia College of Materials & Environmental Engineering Hangzhou DianZiUniversity Hangzhou 310018 China

Cast-mono crystalline silicon wafers contain crystallographic defects, which can severely impact the electrical performance of solar cells. This paper demon- strates that applying hydrogenation processes at moderate temperatures to finished screen print cells can passivate dislocation clusters within the cast-mono crystalline silicon wafers far better than the hydrogenation received during standard commercial firing conditions. Efficiency enhancements of up to 2% absolute are demonstrated on wafers with high dislocation densities. The impact of illumination to manipulate the charge state of hydrogen during annealing is investigated and found to not be significant on the wafers used in this study. This finding is contrary to a previous study on similar wafers that concluded increased H or H0 from laser illumination was responsible for the further passivation of positively charged dangling bonds within the dislocation clusters.

关键词： silicon solar cell dislocation cast-mono,laser hydrogen passivation