检索结果-南通市图书馆

Multifunctional antimicrobial chlorhexidine polymers by remote plasma assisted vacuum deposition

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical science and Engineering 2019年第2期13卷 330-339页

作者： Ana Mora-Boza Francisco J.Aparicio Maria Alcaire Carmen López-santos Juan P.Espinós Daniel Torres-Lagares Ana Borrás Angel Barranco Consejo superior de Investigaciones Cientificas. Instituto de Ciencia de Materiales de sevilla (CsIC-Universidad de sevilla) c/Americo Vespucio 49 41092 SevillaSpain Facultad de Odontologia Universidad de Sevilla (USE) c/Avicena41009 SevillaSpain

Novel antibacterial materials for implants and medical instruments are essential to develop practical strategies to stop the spread of healthcare associated infections. This study presents the synthesis of multifunctional antibacterial nanocoatings on polydimethylsiloxane (PDMs) by remote plasma assisted deposition of sublimated chlorhexidine powders at low pressure and room temperature. The obtained materials present effective antibacterial activity against Escherichia coli K12, either by contact killing and antibacterial adhesion or by biocide agents release depending on the synthetic parameters. In addition, these multifunctional coatings allow the endure hydrophilization of the hydrophobic PDMs surface, thereby improving their biocompatibility. Importantly, cell-viability tests conducted on these materials also prove their non-cytotoxicity, opening a way for the integration of this type of functional plasma films in biomedical devices.

关键词： plasma polymers conformal plasma deposition chlorhexidine bactericide PDMs biocompatibility

Neutrino masses,cosmological inflation and dark matter in a variant U(1)B-L model with type II seesaw mechanism

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2021年第2期45卷 621-630页

作者： J.G.Rodrigues A.C.O.santos J.G.Ferreira Jr C.A.de s.Pires Departamento de Física Universidade Federal da ParaíbaCaixa Postal 500858051-970João PessoaPBBrasil Departamento de Física Universidade Federal do Rio Grande do Norte59078-970NatalRNBrasil

In this study,we implemented the type Ⅱ seesaw mechanism into the framework of the U(l)B-L gauge *** achieve this,we added a scalar triplet,A,to the canonical particle content of the U(l)B-Lgauge *** imposing that the U(l)B-L gauge symmetry be spontaneously broken at TeV scale,we show that the type Ⅱ seesaw mechanism is realized at an intermediate energy scale,more precisely,at approximately 109 *** prevent heavy right-handed neutrinos from disturbing the mechanism,we evoke a Z2 discrete ***,as a result,we have standard neutrinos with mass around eV scale and right-handed neutrinos with mass in TeV scale,with the lightest one fulfilling the condition of dark *** developed all of these in this *** addition,we show that the neutral component of Δ may perform unproblematic non-minimal inflation with loss of unitarity.

关键词： models beyond the standard model particle-theory and field-theory models of the early universe neutrino mass and mixing

Towards an integrated risk analysis security framework according to a systematic analysis of existing proposals

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

Frontiers of Computer science 2024年第3期18卷 199-216页

作者： Antonio santos-OLMO Luis Enrique sÁNCHEZ David G.ROsADO Manuel A.sERRANO Carlos BLANCO Haralambos MOURATIDIs Eduardo FERNÁNDEZ-MEDINA GsyA Research Group University of Castilla-La ManchaCiudad Real 13071Spain Institute for Analytics and Data science University of EssexColchester CO43SQUK Alarcos Research Group University of Castilla-La ManchaCiudad Real 13071Spain IsTR Research group Department of Computer Science and ElectronicsUniversity of CantabriaSantander 39005Spain

The information society depends increasingly on risk assessment and management systems as means to adequately protect its key information *** availability of these systems is now vital for the protection and evolution of ***,several factors have led to an increasing need for more accurate risk analysis *** are:the speed at which technologies evolve,their global impact and the growing requirement for companies to *** analysis processes must consequently adapt to these new circumstances and new technological *** objective of this paper is,therefore,to present the results of an exhaustive analysis of the techniques and methods offered by the scientific community with the aim of identifying their main weaknesses and providing a new risk assessment and management *** analysis was carried out using the systematic review protocol and found that these proposals do not fully meet these new *** paper also presents a summary of MARIsMA,the risk analysis and management framework designed by our research *** basis of our framework is the main existing risk standards and proposals,and it seeks to address the weaknesses found in these *** is in a process of continuous improvement,as is being applied by customers in several European and American *** consists of a risk data management module,a methodology for its systematic application and a tool that automates the process.

关键词： information security management security system security risk assessment and management

Biquadratic exchange interactions in two-dimensional magnets

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 424-434页

作者： Alexey Kartsev Mathias Augustin Richard F.L.Evans Kostya s.Novoselov Elton J.G.santos school of Mathematics and Physics Queen’s UniversityBelfast BT71NNUK Department of Physics The University of YorkYork YO105DDUK Department of Material science&Engineering National University of SingaporeBlock EA9 Engineering Drive 1Singapore 117575Singapore Chongqing 2D Materials Institute Liangjiang New AreaChongqing 400714China Institute for Condensed Matter Physics and Complex systems School of Physics and AstronomyThe University of EdinburghEdinburgh EH93FDUK

Magnetism in recently discovered van der Waals materials has opened several avenues in the study of fundamental spin interactions in truly two-dimensions.A paramount question is what effect higher-order interactions beyond bilinear Heisenberg exchange have on the magnetic properties of few-atom thick *** we demonstrate that biquadratic exchange interactions,which is the simplest and most natural form of non-Heisenberg coupling,assume a key role in the magnetic properties of layered *** a combination of nonperturbative analytical techniques,non-collinear first-principles methods and classical Monte Carlo calculations that incorporate higher-order exchange,we show that several quantities including magnetic anisotropies,spin-wave gaps and topological spin-excitations are intrinsically renormalized leading to further thermal stability of the layers.

关键词： exchange quadratic magnets

The UsLE soil erodibility nomograph revisited

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 soil and Water Conservation Research 2023年第1期11卷 1-13页

作者： Eva Corral-Pazos-de-Provens ígor Rapp-Arraras Juan M.Domingo-santos school of Engineering University of HuelvaE-21007 HuelvaSpain

The nomograph by Wischmeier et al.(1971)for calculating the K-factor in the UsLE was extremely useful when there was low access to ***,the generalised calculation of this factor requires the development of analytic *** paper presents a detailed analysis of the nomograph and its underlying equation,which is applicable only when the silt plus very find sand fraction does not exceed 70%.We also examined the quality of fit on the nomograph of the adaptations to the equation that have been proposed,as a means of dealing with those areas where the original equation is not *** models are shown to have areas where the fit is deficient or even ***,the family of curves on the nomograph for the various values taken by the organic matter are not coincident with the mathematical function from which they presumably *** study also identifies those areas of the textural triangle in which the soils originally used in developing the UsLE are located,with a view to according a lower predictive value to the contrasting areas in which calculations of the K-factor will necessarily be ***,a new equation for calculating the K-factor is presented,which accurately reproduces the different sections of the nomograph,and allows the poorly functioning graph to be dispensed *** paper ends with a link to a tool in R for simplifying the procedure for calculating the K-factor,taking into account varying situations of data availability.

关键词： K-factor RUsLE soil texture Organic matter Very find sand soil loss prediction

Ultrafast laser-driven topological spin textures on a 2D magnet

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 1630-1635页

作者： Mara strungaru Mathias Augustin Elton J.G.santos Institute for Condensed Matter Physics and Complex systems School of Physics and AstronomyThe University of EdinburghEdinburghEH93FDUK Donostia International Physics Center(DIPC) 20018Donostia-San SebastiánBasque CountrySpain Higgs Centre for Theoretical Physics The University of EdinburghEdinburghEH93FDUK

Ultrafast laser excitations provide an efficient and low-power consumption alternative since different magnetic properties and topological spin states can be triggered and manipulated at the femtosecond(fs)***,it is largely unknown whether laser excitations already used in data information platforms can manipulate the magnetic properties of recently discovered two-dimensional(2D)van der Waals(vdW)*** we show that ultrashort laser pulses(30−85 fs)can not only manipulate magnetic domains of 2D-XY CrCl_(3)ferromagnets,but also induce the formation and control of topological nontrivial meron and antimeron spin *** observed that these spin quasiparticles are created within~100 ps after the excitation displaying rich dynamics through motion,collision and annihilation with emission of spin waves throughout the *** findings highlight substantial opportunities of using photonic driving forces for the exploration of spin textures on 2D magnetic materials towards magneto-optical topological applications.

关键词： laser excitation topological

Exploring spatial relationships between stream channel features,water depths and flow velocities during flash floods using HEC-GeoRAs and Geographic Information systems

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 Geographical sciences 2022年第4期32卷 757-782页

作者： Miguel LEAL Eusébio REIs Pedro Pinto santos Centre of Geographical studies and Associated Laboratory TERRA Institute of Geography and Spatial PlanningUniversidade de Lisboa1600-276 LisbonPortugal Forest Research Centre and Associated Laboratory TERRA School of AgricultureUniversidade de LisboaTapada da Ajuda1349-017 LisbonPortugal

Water depths and flow velocities decisively influence the damage caused by flash *** Information system(GIs)is a powerful and useful tool,allowing the spatial analysis of results obtained by hydraulic modelling,namely from the HEC-RAs/HEC-GeoRAs *** GIs spatial analysis performed in this study seeks to explain and quantify the spatial relationships between the stream channel features and flow components during flash flood *** these relationships are generically known,there are few studies exploring this subject in different geographic contexts.A 1D hydraulic model was applied in a small watershed in Portugal,providing good results in the definition of floodable areas,water depths and longitudinal *** direct relationship was found between water depths and velocities in the floodable areas;however,negative strong correlations were found between the two flow components along the stream *** slope,channel and flood width,and roughness prove to be highly relevant on the longitudinal variations of water depths and velocities and on the location of maximum *** peak discharges and return periods(R;)can change the relationships between water depths and velocities at the same *** can be improved with more accurate elevation data for stream channels and floodplains.

关键词： flash floods water depth flow velocity geographic information systems(GIs) spatial analysis

Urban green spaces accessibility in two European cities:Vilnius(Lithuania)and Coimbra(Portugal)

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

Geography and sustainability 2022年第1期3卷 74-84页

作者： Luís Valença Pinto Carla sofia santos Ferreira Miguel Inácio Paulo Pereira Research Centre for Natural Resources Environment and Society(CERNAS)Polytechnic Institute of CoimbraCoimbra Agrarian Technical SchoolCoimbraPortugal Environmental Management Laboratory Mykolas Romeris UniversityVilniusLithuania Department of Physical Geography and Bolin Centre for Climate Research Stockholm UniversitySE-10691 StockholmSweden Navarino Environmental Observatory 24001 MessiniaGreece

Urban green spaces(UGs)are essential for human well-being,contributing towards quality of life and promoting social interactions and *** to recreational UGs is key to human well-being in urban ***,there is a lack of works focused on recreational UGs accessibility in cities from different countries,using different types of *** this work,we studied the accessibility to recreational UGs in Vilnius(Lithuania)and Coimbra(Portugal)through four transport modes(foot,bike,bus and car)within 5-and 10-minute *** results showed important differences between *** had higher accessibility to recreational UGs than Coimbra in all transport *** both cities,the accessibility was highest by car and lowest by ***,the percentage of population covered by 5-and 10-minute distance UGs accessibility in Vilnius is higher than in Coimbra,despite the lower population density in Vilnius.A large number of recreational UGs,their geographic distribution,the dispersed population pattern,and the location of several urbanizations near recreational UGs increased the inhabitant’s accessibility to recreational UGs in *** differences in accessibility between cities were mainly attributed to the large number of recreational UGs and higher road network density,cycleways and footways density,and bus lines in Vilnius,compared to *** work identified the areas where recreational UGs accessibility is difficult in using different transport modes and need to be improved in study *** is essential to support urban planners and increase cities’*** findings of this work will be important for the management of the studied urban areas.

关键词： Recreational UGs Accessibility Transport modes Urban planning Well-being

Dexamethasone intravitreal implant(Ozurdex) in diabetic macular edema: real-world data versus clinical trials outcomes

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 Ophthalmology(English edition) 2021年第10期14卷 1571-1580页

作者： Pedro Neves Mário Ornelas Inês Matias João Rodrigues Margarida santos Marco DutraMedeiros David Martins Department of Ophthalmology Centro Hospitalar de SetúbalSetúbal 2910-549Portugal Department of Ophthalmology Hospital BeatrizÂngeloLoures 2674-514Portugal Department of Ophthalmology Hospital da Luz SetúbalSetúbal 2900-722Portugal Department of Ophthalmology Centro Hospitalar Lisboa CentralFaculdade de Ciências MédicasNOVA University of LisbonLisbon 1990-237Portugal

AIM: To investigate the safety and efficacy of intravitreal dexamethasone implants(Ozurdex?/DEX) in patients with diabetic macular edema(DME) either na?ve or nonna?ve to anti-VEGF therapies who switched to DEX implant independent of response to anti-vascular endothelial growth factors(anti-VEGFs).METHODs: This was an audit retrospective review of medical records of patients with DME who switched to the DEX intravitreal implant. Patients were divided into 2 groups: patients na?ve to antiangiogenic therapy and patients who were previously treated with anti-VEGFs. Data regarding demographics, changes in mean best-corrected visual acuity(BCVA), central macular thickness(CMT), and intraocular pressure(IOP) was collected over 6 mo. The demographic data mean changes in BCVA, CMT, and IOP were compared. six-month follow-up data of 47 patients(57 eyes), who either switched to DEX implant irrespective of response to previous treatments or were treatment na?ve before receiving DEX implant, was ***: Improvement in mean BCVA was observed from 1-4 mo after injection with a decreased effect at month 6 as expected, with better outcomes in na?ve compared to non-na?ve patients. A statistically relevant decrease in mean CMT was observed during the follow-up period. An increase in mean IOP was observed in the first 2 mo after DEX therapy. The mean number of injections of the overall population during the 6 mo was 1.3. A subgroup analysis showed no relevant difference between phakic versus pseudophakic patients relative to measured outcomes. There was no cataract progression during the follow-up period and no adverse events ***: This real-life setting study shows that intravitreal DEX implant is effective and safe. The timings of greater therapeutic impact are concordant with previous studies and suggest that earlier treatment with corticosteroids may have an additional benefit in na?ve patients.

关键词： anti-VEGF therapy diabetic macular edema dexamethasone intravitreal implant na?ve eyes steroids