检索结果-南通市图书馆

Variable exponent Hardy spaces associated with discrete Laplacians on graphs

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2019年第1期62卷 73-124页

作者： Víctor Almeida jorge j.Betancor alejandro j.castro Lourdes Rodríguez-Mesa Departamento de Análisis Matemático Universidad de La Laguna Department of Mathematics Nazarbayev University

In this paper we develop the theory of variable exponent Hardy spaces associated with discrete Laplacians on infinite graphs. Our Hardy spaces are defined by square integrals, atomic and molecular decompositions. Also we study boundedness properties of Littlewood-Paley functions, Riesz transforms, and spectral multipliers for discrete Laplacians on variable exponent Hardy spaces.

关键词： graphs discrete Laplacian Hardy spaces variable exponent square functions spectral multipliers

On Lagrange-Projection Schemes for Shallow Water Flows Over Movable Bottom with Suspended and Bedload Transport

在线全文

学校读者我要写书评

暂无评论

Numerical Mathematics(Theory,Methods and Applications) 2023年第4期16卷 1087-1126页

作者： Alessia Del Grosso Manuel j.castro Díaz Christophe Chalons Tomás Morales de Luna UniversitéParis-Saclay UVSQCNRSLaboratoire de Mathématiques de Versailles78000VersaillesFrance Dpto.de Análisis Matemático Facultad de CienciasUniversidad de MálagaCampus de Teatinos S/N29081 MálagaSpain

In the present work we aim to simulate shallow water flows over movable bottom with suspended and bedload *** order to numerically approximate such a system,we proceed step by *** start by considering shallow water equations with non-constant density of the mixture ***,the Exner equation is included to take into account bedload sediment ***,source terms for friction,erosion and deposition processes are ***,observe that the sediment particle could go in suspension into the water or being deposited on the *** the numerical scheme,we rely on well-balanced Lagrange-projection *** particular,since sediment transport is generally a slow process,we aim to develop semi-implicit schemes in order to obtain fast *** Lagrange-projection splitting is well-suited for such a purpose as it entails a decomposition of the(fast)acoustic waves and the(slow)material waves of the ***,in subsonic regimes,an implicit approximation of the acoustic equations allows us to neglect the corresponding CFL condition and to obtain fast numerical schemes with large time step.

关键词： Shallow water flows movable bottom erosion-deposition processes Lagrangeprojection schemes implicit-explicit schemes

Kentish Plover(Charadrius alexandrinus) and Little Tern(Sternula albifrons) prefer shells for nesting:A field experiment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Avian Research 2024年第1期15卷 55-59页

作者： Macarena castro Andrés De la Cruz Nuria Martin-Sanjuan alejandro Pérez-Hurtado Instituto Universitario de Investigacion Marina(INMAR) Campus de Excelencia Internacional del Mar(CEIMAR)Departamento de BiologíaUniversidad de CadizPuerto RealSpain Servicios centrales de Investigacion Salinas de la Esperanza Universidad de CadizPuerto RealSpain

Shorebird populations are declining worldwide,mainly due to human disturbances and loss of coastal ***,supratidal habitats as saltpans could play a role in buffering human *** have shown to be important as feeding or breeding sites of some shorebird species.A potential conservation strategy to increase shorebird populations in saltpans is to manipulate the cues that birds use to select optimal breeding *** it is hypothesized that shorebirds are attracted to bivalve shells due to the advantages they *** this hypothesis,we supplemented a restored saltpan in 2019 and 2021 with bivalve shells,expecting an increase in the number of breeding birds’ *** than 75% of Kentish Plover(Charadrius alexandrinus) and Little Tern(Sternula albifrons) nests were found in patches with shells in both *** best model for both species indicates that the presence of shells is the factor that most correlates with the location of *** probability of choosing one place over another to settle their nest increases in areas with an abundance of shells,double in the case of the Kentish Plover and triple in the case of the Little *** result of this study may constitute a valuable tool for attracting birds to restored saltpans and could contribute to the success of expensive restoration projects where time is usually a constraint.

关键词： Habitat management Nest site selection Saltpan restoration Shell supplementation Shorebirds

Experimental Study on Split-Ring Resonators with Different Slit Widths

在线全文

学校读者我要写书评

暂无评论

journal of Electromagnetic Analysis and Applications 2013年第9期5卷 366-370页

作者： Pedro j.castro joaquim j.Barroso joaquim P.Leite Neto Associated Plasma Laboratory National Institute for Space Research—INPESao Jose dos CamposBrazil

Metamaterial one-dimensional periodic structures are composed of split-ring resonators, which can display electric permittivity and magnetic permeability simultaneously negative, are studied experimentally. In the present study, each resonator is made up of two concentric circular copper rings patterned on a substrate of kapton, with slits diametrically opposite each other and with the line of the splits along the longitudinal direction of the periodic array containing seven split rings evenly spaced. The experiments consist in inserting the metamaterial slab into a square waveguide of side length 6 mm, corresponding to a cutoff frequency of 25 GHz. Transmission bands due to magnetic and electrical responses are identified for slits with aperture widths of 1 mm and 2 mm, centered at 5.67 and 6.12 GHz frequencies, respectively, values well below the 25 GHz frequency cutoff, so characterizing a medium with negative permeability and permittivity.

关键词： Metamaterials Split-Ring Resonators Magnetic Response Electric Response Left-Handed Transmission Band

Crohn's disease presenting as acute gastrointestinal hemorrhage

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World journal of Gastroenterology 2016年第16期22卷 4073-4078页

作者： Amareshwar Podugu Kanwarpreet Tandon Fernando j.castro Department of Gastroenterology Cleveland Clinic Florida

Severe gastrointestinal (GI) hemorrhage is a rare complication of Crohn’s disease (CD). Although several surgical and non-surgical approaches have been described over the last 2 decades this complication still poses significant diagnostic and therapeutic challenges. Given the relative infrequency of severe bleeding in CD, available medical literature on this topic is mostly in the form of retrospective case series and reports. In this article we review the risk factors, diagnostic modalities and treatment options for the management of CD presenting as GI hemorrhage.

关键词： Crohn’ s disease Recurrence Gastrointestinal hemorrhage Biologic agents Risk factors

Non-Genotoxic *** to Their Risk Assessment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 1993年第1期6卷 71-80页

作者： j.A.castro.M.I.DIAZGOMEZ G.D.castro CentrodeInvestigacionesToxicologicasCitefa/ConicetZufriategui43801603VillaMartelli-BuenosAiresArgentina. CentrodeInvestigacionesToxicologicasCitefa/ConicetZufriategui43801603VillaMartelli-BuenosAiresArgentina.

Epidemiological studies support the idea that most human cancers are related to chemicals present in the human environment. In turn, chemicals are believed to cause cancer via either genotoxic or non-genotoxic mechanisms. There were described in literature several simple, rapid and inexpensive short term tests to reasonably predict the genotoxic nature of chemicals but in contrast, there is no reliable test or battery of tests available to predict the carcinogenicity of non-genotoxic compounds and this poses a major problem to their risk assessment. In addition, there are conflictive opinions about risk assessment needs for both classes of carcinogens. Some workers believe that for non-genotoxic carcinogens, thresholds for exposure can be drawn while others do not. In this review, the reasons behind both of these opinions and the present hypotheses about the mechanism of action of non-genotoxic carcinogens are described and analyzed in relation to future needs.

关键词： Non-Genotoxic Carcinogens.Approaches to Their Risk Assessment

The off-crust origin of granite batholiths

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2014年第1期5卷 63-75页

作者： Antonio castro Unidad Asociada de Petrología Experimental CSIC-Universidad de Huelva.Campus El Carmen21071 Huelva Spain

Granitod batholiths of I-type features （mostly granodiorites and tonalites）, and particularly those forming the large plutonic associations of active continental margins and intracontinental collisional belts, represent the most outstanding magmatic episodes occurred in the continental crust. The origin of magmas, however, remains controversial. The application of principles from phase equilibria is crucial to understand the problem of granitoid magma generation. An adequate comparison between rock com- positions and experimental liquids has been addressed by using a projected compositional space in the plane F（Fe ＋ Mg）-Anorthite-Orthoclase. Many calc-alkaline granitoid trends can be considered cotectic liquids. Assimilation of country rocks and other not-cotectic processes are identified in the projected diagram. The identification of cotectic patterns in batholith implies high temperatures of magma segregation and fractionation （or partial melting） from an intermediate （andesitic） source. The com- parison of batholiths with lower crust granulites, in terms of major-element geochemistry, yields that both represent liquids and solid residues respectively from a common andesitic system. This is compatible with magmas being formed by melting, and eventual reaction with the peridotite mantle, of subducted mOlanges that are finally relaminated as magmas to the lower crust. Thus, the off-crust generation of granitoids batholiths constitutes a new paradigm in which important geological implica- tions can be satisfactorily explained. Geochemical features of Cordilleran-type batholiths are totally compatible with this new conception.

关键词： Batholith Granodiorite Andesite Relamination Granulite Lower crust

Using Delphi and fuzzy DEMATEL for analyzing the intertwined relationships of the barriers of university technology transfer: Evidence from a developing economy

在线全文

学校读者我要写书评

暂无评论

International journal of Innovation Studies 2020年第3期4卷 85-104页

作者： Renissa S.Quinones june Anne A.Caladcad Celbert M.Himang Hubert G.Quinones Charena j.castro Shirley Ann A.Caballes Dharyll Prince M.Abellana Eula Margareth Y.jabilles Lanndon A.Ocampo Technology Research Center Cebu Technological UniversityCorner M.J.Cuenco Ave.&R.Palma St.Cebu City6000Philippines Graduate School Cebu Technological UniversityCorner M.J.Cuenco Ave.&R.Palma St.Cebu City6000Philippines Department of Industrial Engineering Cebu Technological UniversityCorner M.J.Cuenco Ave.&R.Palma St.Cebu City6000Philippines

Universities are highly responsible for knowledge creation and technology ***,university technology transfer(UTT)is considered a challenge in bringing innovative technologies for commercialization and community ***,identifying the barriers and their complex interrelationships that hinder the successful implementation of UTT provides a better understanding of the process,which may be considered as inputs to crucial decision-making *** this approach is highly relevant in the domain field,it remains a point of departure in the current *** paper addresses this gap by holistically determining the UTT barriers and their intertwined *** the Delphi method and the fuzzy decision-making trial and evaluation laboratory(DEMATEL)to carry out this objective,a case study in a state university in the Philippines is presented in this *** show that lack of resources has the strongest causal relationship among the 24 UTT ***,poor marketing/technical/negotiation skills of technology transfer office obtained the highest impacts received and is categorized as the main net *** findings are intended to guide various stakeholders in understanding the influence of barriers in the formulation of strategies and initiatives to carry out effectively the UTT process.

关键词： University technology transfer Barriers Causal relationships Delphi DEMATEL Fuzzy set theory

The role of BRCA 1 and BRCA2 in prostate cancer

在线全文

学校读者我要写书评

暂无评论

Asian journal of Andrology 2012年第3期14卷 409-414,I0006页

作者： Elena castro Rosalind Eeles Oncogenetics Team The Institute of Cancer Research Sutton SM2 5NG UK Academic Urology Unit The Royal Marsden NH Foundation Trust London SW3 6J J UK

One of the strongest risk factors for prostate cancer is a family history of the disease. Germline mutations in the breast cancer predisposition gene 2 （BRCA2） are the genetic events known to date that confer the highest risk of prostate cancer （8.6-fold in men ≤ 65 years）. Although the role of BRCA2 and BRCA1 in prostate tumorigenesis remains unrevealed, deleterious mutations in both genes have been associated with more aggressive disease and poor clinical outcomes. The increasing incidence of prostate cancer worldwide supports the need for new methods to predict outcome and identify patients with potentially lethal forms of the disease. As we present here, BRCA germline mutations, mainly in the BRCA2gene, are one of those predictive factors. We will also discuss the implications of these mutations in the management of prostate cancer and hypothesize on the potential for the development of strategies for sooradic cases with similar characteristics.

关键词： BRCA1 BRCA2 prostate cancer