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A realistic topological p-n junction at the Bi2Se3 （0001） surface based on planar twin boundary defects

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Nano Research 2017年第5期10卷 1784-1793页

作者： Hugo Aramberri M. carmen Munoz Jorge I. Cerda Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC) Cantoblanco Madrid 28049 Spain

We propose a realistic topological p-n junction （TPNJ） by matching two Bi2Se3 （0001） slabs with opposite arrangements of planar twin boundary defects. The atomistic modeling of such a device leads to dislocation defects in the hexagonal lattice in several quintuple layers. Nevertheless, total energy calculations reveal that the interface relaxes, yielding a smooth geometrical transition that preserves the nearest-neighbors fcc-type geometry throughout these defect layers. The electronic, magnetic, and transport properties of the junction have then been calculated at the ab initio level under open boundary conditions, i.e., employing a thin-film geometry that is infinite along the electron transport direction. Indeed, a p-n junction is obtained with a built-in potential as large as 350 meV. The calculations further reveal the spin texture across the interface with unprecedented detail. As the main result, we obtain non-negligible transmission probabilities around the F point, which involve an electron spin-flip process while crossing the interface.

关键词： topological insulators p-n junctions spintronics electronic devices twin boundaries

ADAM17/TACE:a key molecule in brain injury regeneration

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Neural Regeneration Research 2019年第8期14卷 1378-1379页

作者： Samuel Dominguez-Garcia carmen Castro Noelia Geribaldi-Doldan Area de Fisiologia Facultad de Medicina Universidad de Cadiz Cadiz Spain Instituto de Investigacion e Innovacion Biomedica de Cadiz (INIBICA) Universidad de Cadiz Cadiz Spain

It has been many years since "the tumor necrosis factor-a-converting enzyme”,also known as ADAM17/TACE, was described as "the enzyme that does it all” because of its role in neurodegenerative diseases and in several physiological processes including proteolysis, adhesion, intracellular signaling, migration and proliferation. ADAM17/TACE is an integral membrane protein that belongs to the disintegrin and metalloprotease (ADAM) family. Several years ago, Romero-Grimaldi et al.

关键词： ADAM17/TACE key molecule injury regeneration

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谁是下一个英伟达?

商业周刊（中文版） 2024年第5期 51-51页

作者： carmen Reinicke 不详

尽管可能缺乏英伟达这样的单一业务吸引力,但为人工智能计算提供基础设施的硬件公司正在成为下一个交易热点。虽然美光科技、Super Micro Computer和戴尔科技这样的公司因业经验证的业绩而获得回报,但在下个财报季到来前,投资者的预期... 详细信息

尽管可能缺乏英伟达这样的单一业务吸引力,但为人工智能计算提供基础设施的硬件公司正在成为下一个交易热点。虽然美光科技、Super Micro Computer和戴尔科技这样的公司因业经验证的业绩而获得回报,但在下个财报季到来前,投资者的预期正在升温。

关键词：基础设施财报人工智能投资者吸引力

Temporal dynamics of shallow subtidal meiobenthos from a beach in Tenerife (Canary Islands, northeast Atlantic Ocean)

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Acta Oceanologica Sinica 2013年第8期32卷 44-54页

作者： Rodrigo Riera Jorge Núez María del carmen Brito Centro de Investigaciones Medioambientales del Atlántico (CIMA SL) Arzobispo Elías Yanes 4438206 La Laguna Tenerife Canary Islands Spain Benthos Laboratory Department of Animal Biology Faculty of Biology University of La Laguna

A shallow subtidal （3 m deep） meiofaunal assemblage in Los Abrigos Bay, Tenerife, Canary Islands was sam- pled during May 2000-April 2001. The main aims were to （1） find temporal variations in meiofaunal assem- blage structure and overall abundance, as well as in the most abundant meiofaunal species throughout the study period, and （2） identify environmental variables （sedimentary composition, organic matter content, and total nitrogen） that better explain meiofaunal assemblage structure during the study year. The most abundant species were the nematodes Siphonolaimus sp. 2 and Catanema sp., which represented 46.2% of the overall meiofaunal abundances and varied significantly throughout the study duration. Overall meio- faunal abundance and the most abundant taxonomic groups （nematodes, copepods, and oligochaetes） showed significant temporal variations during the study period. Nematodes overwhelmingly dominated during the study period, ranging from 78% in May to 97.34% in February. Multivariate analyses showed seasonality in meiofaunal community structure during the study year, with the lowest abundances in May. Keywords： Meiofauna, assemblage structure, subtidal, Canary Islands, Atlantic Ocean

关键词： Meiofauna assemblage structure subtidal Canary Islands Atlantic Ocean

Environmental Fate of Petroleum Hydrocarbons in Soil:Review of Multiphase Transport,Mass Transfer,and Natural Attenuation Processes

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Pedosphere 2018年第6期28卷 833-847页

作者： Maria BALSEIRO-ROMERO carmen MONTERROSO Juan J.CASARES Department of Chemical Engineering Centre for Research in Environmental Technologies (CRETUS)Universidade de Santiago de CompostelaSantiago de Compostela 15782(Spain) Department of Soil Science and Agricultural Chemistry Centre for Research in Environmental Technologies (CRETUS)Unzversidade de Santiago de CompostelaSantiago de Compostela 15782(Spain)

The increasing use of petroleum-derived fuels over the last few decades has subsequently augmented the risk of spills in the environment. Soil pollution with petroleum hydrocarbons(principally caused by leaks in pipelines and underground storage tanks) is one of the major sources of soil degradation. Once in soil, fuel hydrocarbons suffer from a wide variety of multiphase processes including transport(advection, diffusion, and dispersion) among and within phases(aqueous and non-aqueous liquid, gas, and soil solids), mass transfer among phases(volatilization, sorption, and solution), and other natural attenuation processes, such as biodegradation and plant uptake and metabolism. This review identifies and describes the major processes occurring in soil that have a significant influence on the environmental fate of petroleum hydrocarbons. The definition of the processes involved in pollutant migration and distribution in soil and the formulation of adequate equations using accurate parameters(e.g., diffusion coefficients, velocity of advective flows, and mass transfer coefficients) will allow prediction of the final fate of soil pollutants. In addition to transport and mass transfer processes,which are more widely studied, the incorporation of attenuation mechanisms driven by microorganisms and plants is essential to predict the final concentration of the pollutants in the whole multiphase scenario. This work underlines the importance of the determination of accurate parameters through the performance of laboratory and/or field-scale experiments to develop precise pollutant migration models.

关键词： degradation fuel-derived pollutants modelling multiphase non-aqueous phase liquid soil pollution soil processes sorption

Traditional Chinese Medicine in Canada: An Indigenous Perspective

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Chinese Medicine and Culture 2019年第1期2卷 1-5页

作者： Honoré France carmen Rodriguez Department of Educational Psychology and Leadership Studies Faculty of EducationUniversity of VictoriaVictoriaCanada

This paper summarizes the practice of traditional Chinese medicine(TCM)in Canada by exploring why so many indigenous people are drawn to *** present a brief history of TCM in Canada,including its acceptance by 5 of the 10 provinces in Canada as one of the medical approaches,accepted and regulated by the *** philosophy embedded in TCM is compared to indigenous philosophy,and there is a description of some of the plants and animals used as remedies in indigenous folk *** addition,there is a short description of how TCM psychology parallels some practices in indigenous psychology.

关键词： Canada indigenous philosophy traditional Chinese medicine

Recursions for the Individual Risk Model

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Acta Mathematicae Applicatae Sinica 2006年第4期22卷 543-564页

作者： Jan Dhaene carmen Ribas Raluca Vernic Katholieke Universiteit Leuven Belgium and Universiteit van Amsterdam The Netherlands University of Barcelona Barcelona Spain Ovidius University of Constanta Constanta Romania

In the actuarial literature, several exact and approximative recursive methods have been proposed for calculating the distribution of a sum of mutually independent compound Bernoulli distributed random variables. In this paper, we give an overview of these methods. We compare their performance with the straight- forward convolution technique by counting the number of dot operations involved in each method. It turns out that in many practicle situations, the recursive methods outperform the convolution method.

关键词： Individual risk model recursions computational effort

Stratigraphy of the Lower Cretaceous Sediments from the Carpathian Bend Area,Romania

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Acta Geologica Sinica(English Edition) 2007年第6期81卷 949-956页

作者： Mihaela-carmen MELINTE-DOBRINESCU Dan C.JIPA National Institute of Marine Geology and Geo-ecology(GeoEcoMar)

The Lower Cretaceous sediments of the Ceahlǎu Nappe （from the bend region of the Romanian Carpathians） were investigated from lithological and micropaleontological （calcareous nannoplankton） points of view. Our investigations revealed that the studied deposits were sedimented within the latest Tithonian-Albian interval. The calcareous nannofossil assemblages of the turbidite calcareous successions （the Sinaia Formation） were assigned to the NJK-？NC5 calcareous nannofossil zones, which cover the Late Tithonian-Early Barremian interval. The sandy-shaly turbidites, which followed the calcareous turbidites of the Sinaia Formation, are Early Barremian-Early Albian in age （interval covered by the ？NC5-NC8 calcareous nannofossil zones）. Because the studied deposited are mainly turbidites, many reworked nannofossils from older deposits are present in the calcareous nannofloras. Thus, some biozones （i.e., NC5）, defined based on the last occurrences of nannofossils, could not be identified. The calcareous nannofossil assemblages are composed of Tethyan taxa （which dominate the nannofloras） and cosmopolitan taxa. During two intervals （the Late Valanginian and across the Barremian/Aptian boundary）, Tethyan and cosmopolitan nannofossils, together with Boreal ones, were observed. This type of mixed calcareous nannoplankton assemblage is indicative for sea-level high-stand, which allows the nannofloral exchange between the Tethyan and Boreal realms, within the two-above mentioned intervals.

关键词： Early Cretaceous litho- and biostratigraphy calcareous nannofossils Romanian Carpathians

Onto the sense of smell in macaws, amazons and toucans: can they use volatile cues of fruits to make foraging decisions?

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Integrative Zoology 2023年第4期18卷 762-771页

作者： M.carmen HERNÁNDEZ Ana María VILLADA Isabel BARJA Unidad Zoología Departamento de BiologíaUniversidad Autónoma de MadridCampus Universitario de CantoblancoMadridSpain Toucan Rescue Ranch HerediaCosta Rica Centro de Investigación en Biodiversidad y Cambio Global(CIBC-UAM)Universidad Autónoma de Madrid MadridSpain

Over the past decades,empirical evidence has been accumulated indicating that olfactory information plays a fundamental role in bird life ***,many aspects of avian olfaction remain poorly *** purpose was to broaden the knowledge about the importance of the sense of smell in some neglected bird groups:psittaciformes and ramphastids,and to compare how the response varied between the *** of the lack of information about the use of chemical cues for locating food in fruit-eating species,we also aimed to delve into this *** conducted a 3-choice(water/vinegar/papaya and banana juice)scent test in 5 Costa Rican native species:scarlet macaw(Ara macao),red-lored amazon(Amazona autumnalis),yellow-naped amazon(Amazona auropalliata),keel-billed toucan(Ramphastos sulfuratus),and yellow-throated toucan(Ramphastos ambiguus).Results revealed that macaws and toucans allocated signiﬁcantly more time to interacting with the fruit scent container,indicating that these species can perceive the volatile chemicals emitted by ripe fruits and that they can use this information to make foraging ***,amazons did not dedicate more time to interact with the fruit *** research provides theﬁrst evidence of the ability to exploit chemical volatile cues in macaws and toucans.

关键词： avian olfaction bird senses frugivorous birds psittaciformes ramphastids scent test