检索结果-南通市图书馆

Hydrodynamic finite-size scaling of the thermal conductivity in glasses

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

npj Computational Materials 2023年第1期9卷 696-706页

作者： Alfredo Fiorentino Paolo Pegolo Stefano Baroni SISSA—Scuola Internazionale Superiore di Studi Avanzati 34136 TriesteItaly cnr-iom—Istituto Officina Materiali SISSA Unit34136 TriesteItaly

In the past few years,the theory of thermal transport in amorphous solids has been substantially extended beyond the Allen-Feldman *** resulting formulation,based on the Green-Kubo linear response or the Wigner-transport equation,bridges this model for glasses with the traditional Boltzmann kinetic approach for *** computational effort required by these methods usually scales as the cube of the number of atoms,thus severely limiting the size range of computationally affordable glass *** hydrodynamic arguments,we show how this issue can be overcome through a simple formula to extrapolate a reliable estimate of the bulk thermal conductivity of glasses from finite models of moderate *** showcase our findings for realistic models of paradigmatic glassy materials.

关键词： glasses conductivity thermal

Exotic helium compounds and new states under planetary conditions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2020年第10期7卷 1520-1521页

作者： Erio Tosatti International School for Advanced Studies (SISSA) cnr-iom Democritos National Simulation Center The Abdus Salam International Centre for Theoretical Physics (ICTP)

The variety of states that matter may take under extreme conditions of pressure and temperature—some of which are being discovered by theoretical computer simulations as well as by real experiments—sometimes exceeds and defies fantasy. Multi-megabar pressure conditions, quite hard to realize in the laboratory, are expected to prevail in the core of planets.

关键词：

Human Mobility in the Sendai Framework for Disaster Risk Reduction

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2016年第1期7卷 30-40页

作者： Lorenzo Guadagno Department of Operations and Emergencies International Organization for Migration(IOM)

This article looks at how population movements are addressed by the Sendai Framework for Disaster Risk Reduction 2015–2030(SFDRR), and highlights some of the potential implications of the SFDRR on disaster risk reduction(DRR) and mobility management work. The article looks at the operational implications of the SFDRR text and covers issues of including migrants in DRR work;informing urban development about current and future mobility trends; managing relocations, evacuations, and displacement to prevent future risks and reduce existing ones; and preparing for and managing disaster-induced population movements to reduce the direct and indirect impacts of natural hazards. Overall, the references to human mobility within the SFDRR show an evolution in the way the issue is considered within global policy dialogues. Both the potential of population movements to produce risk and their role in strengthening the resilience of people and communities are now clearly recognized. This is an evolution of previously prevailing views of mobility as the consequence of disasters or as a driver of risk. While some implications of the DRR-mobility nexus might still be missing from DRR policy, population movements are now recognized as a key global risk dynamic.

关键词： Disaster risk reduction Displacement Human mobility Migration Relocation Sendai framework for disaster risk reduction

Nano-confinement of biomolecules： Hydrophilic confinement promotes structural order and enhances mobility of water molecules

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

Nano Research 2016年第2期9卷 273-281页

作者： Bachir Aoun Daniela Russo Argonne National Laboratory Chicago IL 60439 USA cnr-iom c/o Institut Laue-Langevin 38400 Grenoble France Institut Lumiere Matiere Universite de Lyon 69622 Lyon France

Molecular dynamics simulations have been used to investigate the confinement packing characteristics of small hydrophilic （N-acetyl-glycine-methylamide, Nagma） and hydrophobic （N-acetyl-leucine-methylamide, Nalma） biomolecules in large diameter single-wall carbon nanotubes （SWCNTs）. We find that hydrophilic biomolecules easily fill the nanotube and self organize into a geometrical configuration which reminds the water structural organization under SWCNT confinement. The packing of hydrophilic biomolecules inside the cylinder confines all water molecules in its core, which enhances their mobility. Conversely, hydrophobic biomolecules accommodate into the nanotubes with a trend for homogeneous filling, which generate unstable small pockets of water and drive toward a state of dehydration. These results shed light on key parameters important for the encapsulation of biomolecules with direct relevance for long-term storage and prevention of degradation.

关键词： nano-confinement protein folding hydration water carbon nanotube drug delivery

Van der Waals interfacial bonding and intermixing in GeTe-Sb2Te3-based superlattices

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 2018年第3期11卷 1676-1686页

作者： Andriy Lotnyk Isom Hilmi Ulrich Ross Bernd Rauschenbach Leibniz Institute of Surface Modification (iom) Permoserstr. 15 Leipzig D-04318 Germany

Interfacial phase change memory （iPCM） based on GeTe and Sb2Te3 superlattices （SLs） is an emerging contender for non-volatile data storage applications. A detailed knowledge of the atomic structure of these materials is crucial for further development of SLs and for a better understanding of the resistivity switching characteristics of iPCM devices. In this work, crystalline GeTe-Sb2TeB- based SLs, produced by pulsed laser deposition onto a Si（111） substrate at temperatures lower than in previous studies, are analyzed by advanced scanning transmission electron microscopy. The results reveal the formation of Ge-rich Ge（x＋y）Sb（2-y）Tez building blocks with specific numbers of ordered Ge cation layers （between I and 5） and disordered cation layers （4） for z = 6-10, as well as intermixed cation layers for z = 5, within the SLs. The G Ge（x＋y）Sb（2-y）Tez units are separated from the Sb2Te3 building blocks by van der Waals gaps. In particular, the interlayer bonding is promoted by the formation of outermost cation layers consisting of intermixed GeSb within the building blocks adjacent to the van der Waals gaps. The Ge（x＋y）Sb（2-y）Tez units with z 〉 5 retain metastable crystal structures with two-dimensional bonding within the SLs. The present study shed new light on the possible configurations of the building units that can be formed during the synthesis of GeTe-Sb2Te3-based iPCM materials. In addition, a possible switching mechanism active in iPCM materials is discussed.

关键词： interfacial phase change memory (iPCM) thin films intermixing Cs-corrected scanningtransmission electron microscopy

Inclusion of infrared dielectric screening in the GW method from polaron energies to charge mobilities

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 2022年第1期8卷 1300-1307页

作者： Paolo Umari Dipartimento di Fisica e Astronomia Universitàdi Padovavia Marzolo 8I-35131PadovaItaly cnr-iom Istituto Officina Dei Materiali Consiglio Nazionale Delle RicercheArea Science ParkStrada Statale 14km 163.5I-34149TriesteItaly

We introduce in the many-body GW scheme the modulation of the screened Coulomb interaction W arising from the macroscopic dielectric response in the *** derive expressions for the polaron binding energies,the renormalization of the effective masses and for the electron and hole relaxation *** and hole mobilities are then obtained from the incorporation of appropriate scattering ***-blende GaN and orthorhombic MAPbI3 are used as test beds finding fair agreement with results from rigorous electron-phonon coupling *** limited to polar phonons,our method has a negligible computational cost.

关键词： dielectric polaron negligible

Non-contact mechanical and chemical analysis of single living cells by microspectroscopic techniques

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2017年第1期6卷 201-209页

作者： Sara Mattana Maurizio Mattarelli Lorena Urbanelli Krizia Sagini Carla Emiliani Mauro Dalla Serra Daniele Fioretto Silvia Caponi Department of Physics and Geology University of PerugiaPerugia I-06123Italy Laboratory of Biochemistry and Molecular Biology Department of ChemistryBiology and BiotechnologyUniversity of Perugiavia del GiochettoPerugia I-06123Italy CEMIN-Center of Excellence for Innovative Nanostructured Material Perugia I-06123Italy Istituto di Biofisica cnr(IBF-cnr) Unitàdi Trentoand FBKVia Sommarive 18Trento 38123Italy Istituto Officina dei Materiali del cnr(cnr-iom)-Unitàdi Perugia c/o Department of Physics and GeologyUniversity of PerugiaPerugia I-06123Italy

Innovative label-free microspectroscopy,which can simultaneously collect Brillouin and Raman signals,is used to characterize the viscoelastic properties and chemical composition of living cells with sub-micrometric *** unprecedented statistical accuracy of the data combined with the high-frequency resolution and the high contrast of the recently built experimental setup permits the study of single living cells immersed in their buffer solution by contactless *** Brillouin signal is deconvoluted in the buffer and the cell components,thereby revealing the mechanical heterogeneity inside the *** particular,a 20%increase is observed in the elastic modulus passing from the plasmatic membrane to the nucleus as distinguished by comparison with the Raman spectroscopic *** line shape analysis is even more relevant for the comparison of cells under physiological and pathological *** oncogene expression,cells show an overall reduction in the elastic modulus(15%)and apparent viscosity(50%).In a proof-of-principle experiment,the ability of this spectroscopic technique to characterize subcellular compartments and distinguish cell status was successfully *** results strongly support the future application of this technique for fundamental issues in the biomedical field.

关键词： living single cell analysis mechanical properties Raman and Brillouin spectroscopy

Viscoelasticity of amyloid plaques in transgenic mouse brain studied by Brillouin microspectroscopy and correlative Raman analysis

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 Innovative Optical Health Sciences 2017年第6期10卷 3-16页

作者： Sara Mattana Silvia Caponi Francesco Tamagnini Daniele Fioretto Francesca Palombo Department of Physics and Geology University of Perugia Perugia I-06123Italy Istituto Officina dei Materiali del cnr(cnr-iom)-Unita di Perugia Department of Physics and Geology University of Perugia Perugia I-06123Italy Hatherly Laboratories Medical School University of ExeterExeter EX44PSUK School of Physics and Astronomy University of Exeter Exeter EX44QLUK

A myloidopathy is one of the most prominent hallmarks of Alkheimer's disease(AD),the leading cause of dementia worldwide,and is characterized by the accumulation of amyloid plaques in the brain *** plaques consist of abnornal deposits mainly composed of an aggregation-prone protein fragment,B-amyloid 140/1-42,into the extracellular *** micro-spectroscopy is an all-optical contactless technique that is based on the interaction between visible light and longitudinal acoustic waves or phonons,giving access to the viscoelasticity of a sample on a subcellular ***,we describe the first application of micromechanical mapping based on Brillouin scattering spectroscopy to probe the stifness of individual amyloid plaques in the hippocampal part of the brain of a B-amyloid overexpressi ng transgenic *** analysis based on Brillouin and Raman microspectroscopy showed that amyloid plaques have a complex structure with a rigid core of B-pleated shoet conformation(B-aryloid)protein sur-rounded by a softer ring-shaped region richer in lipids and other protein *** preliminary results give a new insight into the plaque biophysics and biomechanics,and a valuable contrast mechanism for the study and diagnosis of amnyloidopathy.

关键词： Alzheimer's imaging vibrational spectrosecopy protein misfolding light scattering

Multiplication and division of the orbital angular momentum of light with diffractive transformation optics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2019年第1期8卷 111-123页

作者： Gianluca Ruffato Michele Massari Filippo Romanato Department of Physics and Astronomy‘G.Galilei’ University of Padovavia Marzolo 835131 PadovaItaly LaNN Laboratory for Nanofabrication of NanodevicesEcamRicertCorso StatiUniti 435127 PadovaItaly cnr-INFM TASC iom National Laboratory S.S.14 Km 163.534012 TriesteItaly

We present a method to efficiently multiply or divide the orbital angular momentum(OAM)of light beams using a sequence of two optical *** key element is represented by an optical transformation mapping the azimuthal phase gradient of the input OAM beam onto a circular *** combining multiple circular-sector transformations into a single optical element,it is possible to multiply the value of the input OAM state by splitting and mapping the phase onto complementary circular ***,by combining multiple inverse transformations,the division of the initial OAM value is achievable by mapping distinct complementary circular sectors of the input beam into an equal number of circular phase *** elements have been fabricated in the form of phase-only diffractive optics with high-resolution electron-beam *** tests confirm the capability of the multiplier optics to perform integer multiplication of the input OAM,whereas the designed dividers are demonstrated to correctly split up the input beam into a complementary set of OAM *** elements can find applications for the multiplicative generation of higher-order OAM modes,optical information processing based on OAM beam transmission,and optical routing/switching in telecom.

关键词： optics circular complementary