检索结果-南通市图书馆

Diffusion dynamics and characterization of attogram masses in optically trapped single nanoparticles using laser-induced plasma imaging

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第5期16卷 7470-7480页

作者： pablo Purohit Francisco J.Fortes Javier Laserna UMALASERLAB Departamento de Química AnalíticaUniversidad de MálagaC/Jiménez Fraud 4Malaga 29010Spain Niels Bohr Institute University of CopenhagenBlegdamsvej 172100 CopenhagenDenmark

In the present work,a wavelength-selected plasma imaging analysis system is presented and used to track photons emitted from single-trapped nanoparticles in air at atmospheric *** isolated nanoentities were atomized and excited into plasma state using single nanosecond laser *** use of appropriate wavelength filters alongside time-optimized acquisition settings enabled the detection of molecular and atomic emissions in the *** photon detection efficiency of the imaging line resulted in a signal>400 times larger than the simultaneously-acquired dispersive spectroscopy *** increase in sensitivity outlined the evolution of diverse physicochemical processes at the single particle scale which included heat and momentum transfer from the plasma into the particle as wells as chemical *** imaging detection of excited fragments evidenced different diffusion kinetics and time frames for atoms and molecules and their influence upon both the spectroscopic emission readout and fabrication processes using the plasma as a ***,the origin of molecular species,whether naturally-occurring or derived from a chemical reaction in the plasma,could also be studied on the basis of compositional gradients found on the *** of detection for the inspected species ranged from tens to hundreds attograms,thus leading to an exceptional sensing principle for single nanoentities that may impact several areas of science and technology.

关键词： single nanoparticle inspection wavelength-selected laser-induced plasma imaging laser fabrication attogram characterization atomic/molecular diffusion

Storylines of family medicine Ⅴ:ways of thinking—honing the therapeutic self

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Family Medicine and Community Health 2024年第S03期12卷 43-51页

作者： William B Ventres Leslie A Stone Johanna F Shapiro Cynthia Haq Jéssica R B Leao Donald E Nease Jr Liz Grant Stewart W Mercer John C M Gillies pablo González Blasco Maria Auxiliadora C De Benedetto Graziela Moreto Marcelo R Levites Jennifer E DeVoe William R Phillips Jane M Uygur Thomas R Egnew Colette S Stanley Family and Preventive Medicine University of Arkansas for Medical Sciences College of MedicineLittle RockArkansasUSA Family Medicine University of California Irvine School of MedicineIrvineCaliforniaUSA Faculty of Medicine University of Sao PauloSao PauloBrazil Family Medicine University of Colorado Anschutz Medical Campus School of MedicineAuroraColoradoUSA Usher Institute Edinburgh Medical SchoolUniversity of EdinburghEdinburghUK SOBRAMFA-Medical Education and Humanism Sao PauloBrazil Family Medicine Oregon Health&Science University School of MedicinePortlandOregonUSA Family Medicine University of Washington School of MedicineSeattleWashingtonUSA General Practice Royal College of Surgeons in IrelandDublinIreland General Internal Medicine Geriatrics&Palliative MedicineTulane University School of MedicineNew OrleansLouisianaUSA

Storylines of Family Medicine is a 12-part series of thematically linked essays with accompanying illustrations that explore the many dimensions of family medicine,as interpreted by individual family physicians and medical educators in the USA and elsewhere around the ***‘Ⅴ:ways of thinking—honing the therapeutic self’,authors present the following sections:‘Reflective practice in action’,‘The doctor as drug—Balint groups’,‘Cultivating compassion’,‘Towards a humanistic approach to doctoring’,‘Intimacy in family medicine’,‘The many faces of suffering’,‘Transcending suffering’and‘The power of listening to stories.’May readers feel a deeper sense of their own therapeutic agency by reflecting on these essays.

关键词： illustration dimensions suffering

Editorial for a special issue on graphene and 2D alternative materials:From preparation to potential applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Materials Science 2022年第1期4卷 1-2页

作者： pablo Ares Felix Zamora Departamento de Fisica de la Materia Condensada and Condensed Matter Physics Center(IFIMAC) Universidad Autonoma de Madrid Madrid28049Spain Departamento de Quimica Inorganica Condensed Matter Physics Center(IFIMAC)and Institute for Advanced Research in Chemical Sciences(IAdChem)Universidad Autonoma de MadridMadrid28049Spain Instituto Madrileno de Estudios Avanzados en Nanociencia(IMDEA-Nanociencia) CantoblancoMadrid28049Spain

The isolation of graphene and subsequent studies showed that obtaining atomically thin crystalline sheets was feasible and possessed extraordinary *** result opened the door to an entirely new family of materials known as two-dimensional or 2D *** in this field is intense:the emergence of new 2D materials,the properties of their combinations and the ability of graphene to reinvent itself,showing novel and exciting properties,make it likely that this field will continue to be one of the leading topics of materials science and condensed matter physics.

关键词： preparation entirely crystalline

Marriage Market with Indifferences: A Linear Programming Approach

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2023年第1期11卷 219-242页

作者： Noelia Juarez pablo A.Neme Jorge Oviedo Instituto de Matemática Aplicada San Luis IMASLRedNIEUniversidad Nacional de San Luis and CONICETD5700HHWSan LuisRepublica Argentina

We study stable and strongly stable matchings in the marriage market with indifference in their *** characterize the stable matchings as integer extreme points of a convex *** give an alternative proof for the integrity of the strongly stable matching ***,we compute men-optimal(women-optimal)stable and strongly stable matchings using linear *** preferences are strict,we find the men-optimal(women-optimal)stable matching.

关键词： Matching markets The marriage market with indifferences Optimal stable matchings Linear programming

On fixity of arc-transitive graphs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2021年第12期64卷 2603-2610页

作者： Florian Lehner Primoz Potocnik pablo Spiga Institute of Discrete Mathematics Graz University of TechnologyGraz 8010Austria Faculty of Mathematics and Physics University of LjubljanaLjubljana 1000Slovenia Dipartimento di Matematica Pura e Applicata University of Milano-BicoccaMilano 20126Italy

The relative xity of a permutation group is the maximum proportion of the points xed by a non-trivial element of the group,and the relative xity of a graph is the relative xity of its automorphism group,viewed as a permutation group on the vertex-set of the *** prove in this paper that the relative xity of connected 2-arc-transitive graphs of a xed valence tends to 0 as the number of vertices grows to in *** prove the same result for the class of arc-transitive graphs of a xed prime valence,and more generally,for any class of arc-transitive locally-L graphs,where L is a xed quasiprimitive graph-restrictive permutation group.

关键词： permutation group xity minimal degree graph automorphism group vertex-transitive arc-transitive xed points

NHC-catalysed[3+2]-asymmetric annulation between pyrazolin-4,5-diones and enals:synthesis of novel spirocyclic pyrazolone γ-butyrolactones and computational study of mechanism and stereoselectivity

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Organic Chemistry Frontiers 2022年第2期9卷 420-427页

作者： Marta Gil-Ordonez Alicia Maestro pablo Ortega pablo G.Jambrina Jose M.Andres GIR-SintACat-Instituto Universitario CINQUIMA y Departamento de Química Orgánica Facultad de CienciasUniversidad de ValladolidPaseo Belén 747011 ValladolidSpain Departamento de Química Física University of Salamanca37008 SalamancaSpain

Chiral pyrazolones with a spirocyclic centre at the C4-position are widely found in a large family of medically relevant *** recent years,organocatalysis,particularly that performed with quiral N-heterocyclic carbenes(NHCs),has allowed the enantioselective synthesis of these spirocyclic compounds despite its inherent *** this work,we describe the fully diastereo-and highly enantioselective synthesis of novel spirocyclic pyrazolone γ-butyrolactones via NHC-catalysed[3+2]annulation reaction of enals and 1H-pyrazol-4,*** understand the catalytic mechanism and origin of stereoselectivity,electronic structure calculations were carried *** considering various pathways,we concluded that the stereoselectivity-determining step is the formation of the lactone that proceeds after addition of the NHC derived homoenolate to the electrophilic carbonyl group of pyrazolin-4,*** calculations predict that the free energy barrier is lower for the(RS)product,which is also the main product experimentally obtained.

关键词： synthesis spiro mechanism

The role of the Frontiers of Knowledge Awards in identifying the global leaders in ecological research

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ecosystem Health and Sustainability 2017年第5期3卷 24-28页

作者： pablo Jauregui Monica Salomone Communications Department BBVA FoundationMadridSpain

Introduction:This paper outlines the origins and rationale of the Frontiers of Knowledge Awards,a new family of international prizes created in 2008 by the BBVA Foundation of *** aim of these awards is to recognize world-class contributions in a range of scientific,technological,and artistic areas which address the central challenges of the twenty-first *** key distinguishing feature is the fact that they have incorporated amongst their categories the two fundamental fields of contemporary environmental research:Ecology and Conservation Biology and Climate ***:By documenting the winners of the Frontiers of Knowledge Awards in these two areas,as well as the reasons for which they received this recognition during their previous nine editions,we show how these prizes have helped to identify some of the leading international figures in environmental science,such as Edward ***,Daniel ***,Jane Lubchenco,and Ilkka ***:In conclusion,we suggest that this initiative contributes to the public salience of the global ecological problems which threaten the future of our *** the same time,the Frontiers of Knowledge Awards serve to highlight the fundamental importance of the pioneering scientists whose research can provide the only reliable basis on which globalpolicy makers must make informed decisions to successfully confront the environmental challenges of our time.

关键词： Ecology conservation biology climate change Awards

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

银行监管面临的两个事实和一个谬论

中国金融 2024年第7期 15-17页

作者：巴勃罗·埃尔南德斯·德·科斯张林(译) 巴塞尔银行监管委员会西班牙银行《中国金融》杂志

多年来,在欧洲金融监管专业智库Eurofi举办的各种活动中,人们一直热衷于讨论巴塞尔银行监管委员会(以下简称巴塞尔委员会)的工作以及更加广泛的审慎监管问题。粗略地回顾一下Eurofi之前召开的会议,大家就不难发现这样一些主题:“巴塞尔... 详细信息

多年来,在欧洲金融监管专业智库Eurofi举办的各种活动中,人们一直热衷于讨论巴塞尔银行监管委员会(以下简称巴塞尔委员会)的工作以及更加广泛的审慎监管问题。粗略地回顾一下Eurofi之前召开的会议,大家就不难发现这样一些主题:“巴塞尔协议Ⅲ对欧盟金融活动的影响”(2019年)、“在欧盟实施巴塞尔协议:尚存的挑战和时机”(2021年).

关键词：巴塞尔协议巴塞尔委员会审慎监管金融监管银行监管巴塞尔银行监管委员会欧盟

On the numerical solution to the truncated discrete SPH formulation of the hydrostatic problem

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2020年第4期32卷 699-709页

作者： pablo Eleazar Merino-Alonso Fabricio Macia Antonio Souto-Iglesias Mathematical Modeling Analysisand Simulation Applied to Engineering Research Group(M2ASAI)Universi dad politecnica de Madrid(UPM)School of marine engineering(ETSIN)MadridSpain Marine and Hydrodynamical Model Basin Research Group(CEHINAV) Universidad Politecnica de Madrid(UPM)School of Marine Engineering(ETSIN)MadridSpain

The aim of this work is to study the solution of the smoothed particle hydrodynamics(SPH)discrete formulation of the hydrostatic problem with a free *** problem,in which no time dependency is considered,takes the form of a system of linear *** particular,the problem in one dimension is *** focus is set on the convergence when both the particle spacing and the smoothing length tend to zero by keeping constant their *** of this ratio of the order of one,corresponding to a limited number of neighbors,are of practical ***,the problem in which each particle has one single neighbor at each side is *** explicit expressions of the numerical solution and the quadratic error are provided in this *** expression of the quadratic error demonstrates that the SPH solution does not converge to the exact one in general under the specified *** this case,the error converges to a residue,which is in general large compared to the norm of the exact *** cases with two and three neighbors are also *** analytical study in the case of two neighbors is performed,showing how the kernel influences the accuracy of the solution through modifying the condition number of the referred system of linear *** addition to that,a numerical investigation is carried out using several Wendland kernel *** two and three neighbors are involved it is found that the error tends in most cases to a small limiting value,different from zero,while divergent solutions are also found in the case of two neighbors with the Wendland Kernel *** cases with more neighbors are also *** general,the Wendland Kernel C2 turns out to be the worst choice,as the solution is divergent for certain values of the ratio between the particle spacing and the smoothing length,associated with an ill-conditioned matrix.

关键词： Smoothed particle hydrodynamics(SPH) convergence water-at-rest problem hydrostatic tank,free surface kernel truncation