检索结果-南通市图书馆

Frontiers of Materials Science 2017年第2期11卷 171-181页

作者： Abdollah SABOORI Matteo PAVESE claudio BADINI Paolo FINO Department of Applied Science and Technology Politecnico Di Torino Corso Duca Degli Abruzzi 24 10129 Torino Italy

Aluminum and copper matrix nanocomposites reinforced by graphene nanoplatelets （GNPs） were successfully fabricated by a wet mixing method followed by conventional powder metallurgy. The uniform dispersion of GNPs within the metal matrices showed that the wet mixing method has a great potential to be used as a mixing technique. However, by increasing the GNPs content, GNPs agglomeration was more visible. DSC and XRD of AI/GNPs nanocomposites showed that no new phase formed below the melting point of AI. Microstructural observations in both nanocomposites reveal the evident grain refinement effect as a consequence of GNPs addition. The interfacial bonding evaluation shows a poor interfacial bonding between GNPs and AI, while the interfacial bonding between Cu and GNPs is strong enough to improve the properties of the Cu/GNPs nanocomposites. In both composites, the coefficient of thermal expansion decreases as a function of GNPs while, their hardness is improved by increasing the GNPs content as well as their elastic modulus.

关键词： nanocomposite aluminum copper graphene microstructure thermal expansion

Behavioral constraints and the evolution of faithful social learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2012年第2期58卷 307-318页

作者： Alberto ACERBI Pierre O. JACQUET claudio TENNIE Center for the Study of Cultural Evolution University of Stockholm 106 91 Stockholm Sweden Department of Psychology University of Bologna Bologna Italy INSERM U1028 CNRS UMR5292 Lyon Neuroscience Research Center ImpAct Team Lyon France Department of Developmental and Comparative Psychology Max Planck Institute for Evolutionary Anthropology Leipzig Germany

Behavioral ＂traditions＂, i.e. behavioral patterns that are acquired with the aid of social learning and that are relatively stable in a group, have been observed in several species. Recently, however, it has been questioned whether non-human social learning is faithful enough to stabilize those patterns. The observed stability could be interpreted as a result of various constraints that limit the number of possible alternative behaviors, rather than of the fidelity of transmission mechanisms. Those constraints can be roughly described as ＂internal＂, such as mechanical （bodily） properties or cognitive limitations and predispositions, and ＂ex- ternal＂, such as ecological availability or pressures. Here we present an evolutionary individual-based model that explores the re- lationships between the evolution of faithful social learning and behavioral constraints, represented both by the size of the beha- vioral repertoire and by the ＂shape＂ of the search space of a given task. We show that the evolution of high-fidelity transmission mechanisms, when associated with costs （e.g. cognitive, biomechanical, energetic, etc.）, is only likely if the potential behavioral repertoire of a species is large and if the search space does not provide information that can be exploited by individual learning. Moreover we show how stable behavioral patterns （＂traditions＂） can be achieved at the population level as an outcome of both high-fidelity and low-fidelity transmission mechanisms, given that the latter are coupled with a small behavioral repertoire or with a search space that provide substantial feedback. Finally, by introducing the possibility of environmental change, we show that intermediate rates of change favor the evolution of faithful social learning

关键词： Animal social learning Cultural evolution Cultural transmission Copying fidelity Individual based modeling

Oxygen-vacancy induced magnetic phase transitions in multiferroic thin films

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2020年第1期6卷 1047-1055页

作者： César Menéndez Dewei Chu claudio Cazorla School of Materials Science and Engineering UNSW SydneySydneyNSW 2052Australia

Multiferroics in which giant ferroelectric polarization and magnetism coexist are of tremendous potential for engineering disruptive applications in information storage and energy *** the functional properties of multiferroics are thought to be affected detrimentally by the presence of point defects,which may be abundant due to the volatile nature of some constituent atoms and the high temperatures involved in the synthesis of ***,we demonstrate with theoretical methods that oxygen vacancies may enhance the functionality of multiferroics by radically changing their magnetic interactions in thin ***,oxygen vacancies may restore missing magnetic super-exchange interactions in large axial ratio phases,leading to full antiferromagnetic spin ordering,and induce the stabilization of ferrimagnetic states with considerable net *** theoretical study should help to clarify the origins of long-standing controversies in bismuth ferrite and improve the design of technological applications based on multiferroics.

关键词： magnetic Oxygen transitions

European digital archive on soil maps (EuDASM): preserving important soil data for public free access

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2011年第5期4卷 434-443页

作者： Panos Panagos Arwyn Jones claudio Bosco PSSenthil Kumar Joint Research Centre of the European Commission Institute for Environment and SustainabilityIspra(VA)Italy Department of Soil Science&Agricultural Chemistry Faculty of AgricultureAnnamalai UniversityTamil NaduIndia

Historical soil survey paper maps are valuable resources that underpin strategies to support soil protection and promote sustainable land use practices,especially in developing countries where digital soil information is often ***,many of the soil maps,in particular those for developing countries,are held in traditional archives that are not easily accessible to potential ***,many of these documents are over 50 years old and are beginning to *** the need to conserve this information,the Joint Research Centre(JRC)and the ISRIC-World Soil Information foundation have created the European Digital Archive of Soil Maps(EuDASM),through which all archived paper maps of ISRIC has been made accessible to the public through the *** immediate objective is to transfer paper-based soil maps into a digital format with the maximum possible resolution and to ensure their preservation and easy *** than 6,000 maps from 135 countries have been captured and are freely available to users through a user-friendly web-based *** feedback has been very positive,especially from users in Africa,South America and Asia to whom archived soil maps were made available to local users,often for the first ***:http://***/library/maps/country_maps/list_***.

关键词： soil maps digital archive electronic restoration digital earth online catalogue

Mg-based materials for hydrogen storage

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 Magnesium and Alloys 2021年第6期9卷 1837-1860页

作者： Yuanyuan Shang claudio Pistidda Gökhan Gizer Thomas Klassen Martin Dornheim Department of Materials Design Institute of Hydrogen TechnologyHelmholtz-Zentrum hereon GmbHMax-Planck-Straße 121502GeesthachtGermany Department of Mechanical Engineering Helmut-Schmidt-UniversityHolstenhofweg 8522043HamburgGermany

Over the last decade’s magnesium and magnesium based compounds have been intensively investigated as potential hydrogen storage as well as thermal energy storage materials due to their abundance and availability as well as their extraordinary high gravimetric and volumetric storage *** review work provides a broad overview of the most appealing systems and of their hydrogenation/dehydrogenation *** emphasis is placed on reviewing the efforts made by the scientific community in improving the material’s thermodynamic and kinetic properties while maintaining a high hydrogen storage capacity.

关键词： Hydrogen storage materials Magnesium-based hydrides Metal hydrides Nanostructures Catalysts Hydrogenation and dehydrogenation Kinetics Thermodynamics Activation energy

Properties of nuclear pastas

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2021年第2期16卷 119-173页

作者： Jorge A.Lopez claudio O.Dorso Guillermo Frank Department of Physics University of Texax at El PasoEl PasoTexas 79968USA Departamento de Fisica FCENUniversidad de Buenos AiresNunezArgentina Unidad de Investigacion y Desarrollo de las Ingenierias Universidad Tecnologica NacionalFacultad Regional Buenos AiresBuenos AiresArentina

In this review we study the nuclear pastas as they are expected to be formed in neutron star *** start with a study of the pastas formed in nuclear matter(composed of protons and neutrons),we follow with the role of the electron gas on the formation of pastas,and we then investigate the pastas in neutron star matter(nuclear matter embedded in an electron gas).Nuclear matter(NM)at intermediate temperatures(1 MeV≤T≤***),at saturation and and sub-saturation densities,and with proton content ranging from 30%to 50%was found to have liquid,gaseous and liquid-gas mixed *** isospin-dependent phase diagram was obtained along with the critical points,and the symmetry energy was calculated and compared to experimental data and other *** low temperatures(T≤1 MeV)NM produces crystal-like structures around satura-tion densities,and pasta-like structures at sub-saturation *** of the pasta structures were studied with cluster-recognition algorithms,caloric curve,the radial distribution function,the Lindemann coefficient,Kolmogorov statistics,Minkowski functionals;the symmetry energy of the pasta showed a connection with its *** star matter(NSM)is nuclear matter embedded in an electron *** electron gas is included in the calculation by the inclusion of an screened Coulomb *** connect the NM pastas with those in neutron star matter(NSM),the role the strength and screening length of the Coulomb interaction have on the formation of the pastas in NM was *** was found to exist even without the presence of the electron gas,but the effect of the Coulomb interaction is to form more defined pasta structures,among other ***,it was determined that there is a minimal screening length for the developed structures to be independent of the cell *** star matter was found to have similar phases as NM,phase transitions,symmetry energy,structure function and thermal *** in NM,pasta f

关键词： nuclear pasta neutron star matter nuclear symmetry energy molecular dynamics nuclear phase transitions

Gene therapy in Parkinson's disease: targeting the endplasmic reticulum proteostasis network

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2015年第7期10卷 1053-1054页

作者： Valentina Castillo Gabriela Mercado claudio Hetz Biomedical Neuroscience Institute Faculty of MedicineUniversity of Chile Program of Cellular and Molecular Biology Center for Molecular Studies of the Cell Institute of Biomedical SciencesUniversity of Chile Department of Immunology and Infectious Diseases Harvard School of Public Health

Parkinson’s disease（PD）is the second most common neurodegenerative disease affecting 1%of the population over 60 years of *** progressive degeneration of dopaminergic neurons at the substantia nigra pars compacta（SNpc）results in a severe and gradual depletion of dopamine content in the striatum,a phenomena that is responsible for the characteristic motor symptoms of this disease.

关键词： gene Gene therapy in Parkinson’s disease targeting the endplasmic reticulum proteostasis network

Comparative ecogenotoxicology： Monitoring the DNA of wildlife

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2014年第2期60卷 252-254页

作者： Dario ANGELETTI claudio CARERE Guest Editors Department of Ecological and Biological Sciences Ichthyogenic Experimental Marine Centre (CISMAR) Tuscia UniversityBorgo Le Saline 01016 Tarquinia VT

Ecogenotoxicology is the study of interactions between genetic material and DNA-damaging agents of anthropogenic origin in wild populations, in relation to subsequent effects on the health of organisms （Shugart and Theodorakis, 1994）. Traditionally, biomarkers for genetic toxicology can be classified in ＂biomarkers of exposure＂ and ＂biomarkers of effect＂, depending whether the aim is to monitor and quantify the exposure to genotoxicants,

关键词： DNA损伤野生动物监测生物标志物生物标记物人类起源遗传物质相互作用

ERp57 in neurodegeneration and regeneration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2016年第2期11卷 232-233页

作者： Leslie Bargsted claudio Hetz Soledad Matus Neurounion Biomedical Foundation CENPAR Santiago Chile Biomedical Neuroscience Institute Faculty of Medicine University of Chile Santiago Chile Center for Geroscience Brain Health and Metabolism Institute of Biomedical Sciences Center for Molecular Studies of the Cell Program of Cellular and Molecular Biology University of ChileSantiago Chile Department of Immunology and Infectious Diseases Harvard School of Public Health

The protein disulfide isomerases（PDIs）family has a central function in the folding of proteins synthetized through the secretory ***57,also known as Grp58 or PDIA3,is one of the main studied members of this family.

关键词： ERp57 in neurodegeneration and regeneration PDI

Active explorers show low learning performance in a social insect

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2017年第5期63卷 555-560页

作者： Eve UDINO Margot PEREZ claudio CARERE Patrizia d'ETTORRE Laboratory of Experimental and Comparative Ethology University Paris 13 Sorbonne Paris Cit6 93430 Villetaneuse France

An intriguing question in behavioral biology is whether consistent individual differences （calledanimal personalities） relate to variation in cognitive performance because commonly measuredpersonality traits may be associated with risk-reward trade-offs. Social insects, whose learningabilities have been extensively characterized, show consistent behavioral variability, both at colonyand at individual level. We investigated the possible link between personality traits and learningperformance in the carpenter ant Camponotus aethiops. Exploratory activity, sociability, and ag-gression were assessed twice in ant foragers. Behaviors differed among individuals, they werepartly repeatable across time and exploratory activity correlated positively with *** abilities were quantified by differential conditioning of the maxilla-labium extension re-sponse, a task that requires cue perception and information storage. We found that exploratory ac-tivity of individual ants significantly predicted learning performance：＂active-explorers＂ wereslower in learning the task than ＂inactive-explorers＂. The results suggest for the first time a link be-tween a personality trait and cognitive performance in eusocial insects, and that the underlying in-dividual variability could affect colony performance and success.

关键词： ants, associative learning, cognition, exploratory activity, personality.