检索结果-南通市图书馆

The Efficiency of cP-Violating <i>α</i>2-Dynamos from Primordial cosmic Axion Oscillation with Torsion

在线全文

学校读者我要写书评

暂无评论

International Journal of Astronomy and Astrophysics 2015年第1期5卷 56-59页

作者： L. c. garcia de Andrade Department of Theoretical Physics State University of Rio de Janeiro (UERJ) Rio de Janeiro Brazil

recently torsion fields were introduced in cP-violating cosmic axion a2-dynamos [garcia de Andrade, Mod Phys Lett A, (2011)] in order to obtain Lorentz violating bounds for torsion. Here instead, oscillating axion solutions of the dynamo equation with torsion modes [garcia de Andrade, Phys Lett B (2012)] are obtained taking into account dissipative torsion fields. Magnetic helicity torsion oscillatory contribution is also obtained. Note that the torsion presence guarantees dynamo efficiency when axion dynamo length is much stronger than the torsion length. Primordial axion oscillations due to torsion yield a magnetic field of 109 g at Nucleosynthesis epoch. This is obtained due to a decay of BBN magnetic field of 1015 g induced by torsion. Since torsion is taken as 10–20 s–1, the dynamo efficiency is granted over torsion damping. Of course dynamo efficiency is better in the absence of torsion. In the particular case when the torsion is obtained from anomalies it is given by the gradient of axion scalar [Duncan et al., Nuclear Phys B 87, 215] that a simpler dynamo equation is obtained and dynamo mechanism seems to be efficient when the torsion helicity, is negative while magnetic field decays when the torsion is positive. In this case an extremely huge value for the magnetic field of 1015 gauss is obtained. This is one order of magnitude greater than the primordial magnetic fields of the domain wall. Actually if one uses tDW ~ 10-4 s one obtains BDW ~ 1022 g which is a more stringent limit to the DW magnetic primordial field.

关键词： Torsion Theories Axion Dynamo Primordial Magnetic Fields

HOW MULTISPEcIES INTErcrOP ADVANTAgE rESPONDS TO WATEr STrESS:A YIELDcOMPONENT EcOLOgIcAL FrAMEWOrK AND ITS EXPErIMENTAL APPLIcATION

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 Agricultural Science and Engineering 2021年第3期8卷 416-431页

作者： Luis garcia-BArrIOS Yanus A.DEcHNIK-VAZQUEZ The South Frontier college Panamerican and South Peripheric Avenues(w/o number)San Cristobal de las CasasChiapas 29290Mexico Pre-Planning center of the gulf Federal Electricity ComissionDiego de Ordaz 593Boca del RioVeracruz 94295Mexico

Absolute yield and land use efficiency can be higher in *** this phenomenon is common,it is not always the ***,these two benefits are frequently confused and do not necessarily occur *** choices become more complex when considering that multicrops are subject to strong spatial and temporal variation in average soil moisture,which will worsen with climate *** in agroecosystems is expected to buffer this impact by favoring resistance to reduced humidity,but there are few empirical/experimental studies to validate this *** is not clear if relatively higher multicrop yield and land use efficiency will persist in the face of reduced soil moisture,and how the relation between these benefits might ***,we present a relatively simple framework for analyzing this *** propose a relative multicrop resistance(rMr)index that captures all possible scenarios of absolute and relative multicrop overyield under water *** dissect the ecological components of rMr to understand the relation between higher multicrop yield and land use efficiency and the ecological causes of different overyield *** demonstrate the use of this framework with data from a 128 microplot greenhouse experiment with small annual crops,arranged as seven-species multicrops and their corresponding monocrops,all under two contrasting watering *** applied simple but robust statistical procedures to resulting data(based on bootstrap methods)to compare rMr,and its components,between different plants/plant *** also provide simple graphical tools to analyze the data.

关键词： agroecosystem sustainability crop overyielding intercrop drought resistance overyield ecological components

Development of Hybrids composites of carbon and Aramid Fibers to reinforce Matrix of Epoxy resins Part I

在线全文

学校读者我要写书评

暂无评论

材料科学与工程（中英文B版） 2018年第2期8卷 86-89页

作者： Arnaldo carlos Morelli Jose Antonio garcia croce célio caminaga Letícia r.Timarco Federal Institute of Sao Paulo Sao Carlos IFSP-SCBrazil

composite materials may be composed of several types of fiber and *** design of hybrid composites intends to improve the physico-mechanical properties of this kind of materials,compared to standard composites,which consist of epoxy resin matrixes and carbon fibers,which presents low impact *** goal was the development and characterization of a hybrid material composed of two kinds of fibers,carbon and Kevlar,in the fabric format,joined by epoxy resin *** standard composition is the composition 1:containing 55%-60%carbon fiber and 40%-45%epoxy *** hybrid composite is the composition 2:that contains 30%-33%carbon fiber,25%-27%Kevlar fiber and 40%-45%of epoxy *** composite plates were prepared using a laminator machine and later they were process in a vacuum bag and cured in *** study aimed at comparing the physical and mechanical properties of these *** mechanical tests were focus on measurements of the tensile,flexural and impact charpy stresses,and physics tests by measures of bulk *** these procedures,we hope to find out data that may be useful for a partial characterization of these products for applications in the aerospace industry.

关键词： Hybrid composites fibers Kevlar/carbon physical and mechanics properties

Direct observation of longitudinal aberrated wavefields

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics research 2023年第6期11卷 1015-1020页

作者： J.P.TrEVINO V.cOELLO A.JAIMES-NÁJErA c.E.garcia-OrTIZ S.cHÁVEZ-cErDA J.E.gÓMEZ-cOrrEA Tecnológico de Monterrey School of Engineering and SciencesMonterrey NL 64849Mexico Universidad Politécnica de Puebla CuanaláPuebla 72640Mexico centro de Investigación científica y de Educación Superior de Ensenada Unidad MonterreyApodaca NL 66629Mexico Instituto Nacional de Astrofísica Óptica y ElectrónicaCoordinación deÓpticaTonantzintla Puebla 72840Mexico

rather than focusing on a focal spot,aberrated wavefields spread out over a *** a wave phenomenon,optical aberrations are analyzed in terms of waves propagating in the 3D *** this work,we report the observation of 2D longitudinal aberrated *** observation can be visualized by mapping the intensity distributions of surface plasmon polaritons(SPPs)that propagate on a metal/air interface using leakage radiation *** orientation of the SPP beam is tweaked by tilting and translating the system to mimic aberrated beams,presenting known Seidel terms:defocus,spherical,coma,and tilt *** approach allows the examination of the longitudinal evolution of aberrated beams in a visual and rapid manner,in contrast to more complicated post-processing reconstructions.

关键词： space wave fields

World Kidney Day 2011：Protect Your Kidneys, Save Your Heart

在线全文

学校读者我要写书评

暂无评论

肾脏病与透析肾移植杂志 2011年第1期20卷 3-6,28页

作者： William g couser MD Miguel c riella MD For the Joint International Society of Nephrology (Wgc) and International Federationof Kidney Foundations (Mcr) World Kidney Day 2011 Steering committee

Introduction to World Kidney Day2011 March10,2011will mark the celebration of the6th World Kidney Day(WKD),an annual event jointly sponsored by the International Society of Nephrology and the International Federation of Kidney Foundations. Since its inception in2006,WKD has grown dramatically to become the most widely celebrated event associated with kidney disease in the world and the most successful effort to raise awareness among both

关键词：肾形矿脉肾脏病临床治疗患者

contribution of extracellular vesicles to steatosis-related liver disease and their therapeutic potential

在线全文

学校读者我要写书评

暂无评论

World Journal of Hepatology 2024年第9期16卷 1211-1228页

作者： Margarita Montoya-Buelna Inocencia g ramirez-Lopez cesar A San Juan-garcia Jose J garcia-regalado Mariana S Millan-Sanchez Ulises de la cruz-Mosso Jesse Haramati Ana L Pereira-Suarez Jose Macias-Barragan Laboratorio de Inmunología Departamento de FisiologíaUniversidad de GuadalajaraGuadalajara 44340JaliscoMexico Departamento de ciencias de la Salud Centro Universitario de los VallesUniversidad de GuadalajaraAmeca 46600JaliscoMexico Doctorado en ciencias Biomédicas Centro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajara 44340JaliscoMexico Laboratorio de Inmunología Departamento de FisiologíaCentro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajara 44340JaliscoMexico red de Inmunonutrición y genómica Nutricional en las Enfermedades Autoinmunes Departamento de NeurocienciasCentro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajara 44340JaliscoMexico Laboratorio de Inmunobiología Departamento de Biología Celular y MolecularCentro Universitario de Ciencias Biológicas y AgropecuariasUniversidad de GuadalajaraZapopan 45200JaliscoMexico Instituto de Investigación en ciencias Biomédicas Departamento de Microbiología y PatologíaCentro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajara 44340JaliscoMexico

Extracellular vesicles(EVs)are small particles released by many cell types in different tissues,including the liver,and transfer specific cargo molecules from originating cells to receptor *** process generally culminates in activation of distant cells and inflammation and progression of certain *** global chronic liver disease(cLD)epidemic is estimated at 1.5 billion patients *** and liver cancer are the most common risk factors for ***,hepatitis c and B virus infection and obesity are also highly associated with ***,the etiology of many cLD pathophysiological,cellular,and molecular events are *** in hepatic lipid metabolism can lead to lipotoxicity events that induce EV ***,we aimed to present an overview of EV features,from definition to types and biogenesis,with particular focus on the molecules related to steatosis-related liver disease,diagnosis,and therapy.

关键词： Extracellular vesicles Exosomes chronic liver disease Hepatocellular carcinoma Nonalcoholic fatty liver disease Nonalcoholic steatohepatitis

Sustainability Evaluation of Mangrove Forest Management System of Tagbanua Tribe in Bgy. Manalo, Puerto Princesa city, Palawan, Philippines

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 Environmental & Earth Sciences 2023年第2期5卷 36-49页

作者： Mark Joseph J.Buncag Jaybie S.Arzaga Liezl F.Tangonan Jeffrey H.de castro Mary claire M.Villanueva Lilia Margallo Imelda r.Lactuan Sheryl g.Docto Angelo V.garcia Princes Eunice c.Denosta Sweet Angelikate L.Villaruel Environmental Science and graduate Department College of Forestry and Environmental StudiesMindanao State University Main Campus9700Philippines college of Sciences Palawan State University Main CampusPalawan5300Philippines Social Sciences Division National Research Council of the Philippines(NRCP)1631Philippines

community-based forest management agreement in the country is a needed instrument in attaining sustainability of mangrove ***,there is no assurance that the system implemented in the mangrove forest management is ***,evaluating the mangrove management sustainability of the local tribe is a viable avenue for the appropriate *** this study,the sustainability of the mangrove management system of the Tagbanua tribe in ***,Puerto Princesa city,Palawan was *** study utilized various criteria with relevant indicators of sustainable mangrove forest management in assessing the mangrove forest management *** group discussions were conducted to identify the relevant sustainable mangrove forest management c&I and *** indicator was rated using the formulated verifiers in the form of the rating *** household interviews,FgD,KII,mangrove assessment,and secondary data analysis,this study also used a mathematical model on the Sustainability Index for Individual criteria(SIIc)to evaluate the scores for individual criteria and the Overall Sustainability Index(OSI)of the *** a result,there are a total of seven relevant criteria,and 35 relevant indicators for Mangrove Management in Barangay *** on the individual rating of seven criteria,the overall rating of the sustainable mangrove management system is 1.80,which implies a fairly sustainable mangrove management ***,the computed overall sustainability index is 0.26,which is fairly or moderately *** criterion has strengths and weaknesses and needs to be improved to have a highly sustainable mangrove management system.

关键词： Mangrove management system relevant criteria and indicators Mangrove sustainability index

consumption of Dairy and Metabolic Syndrome risk in a convenient Sample of Mexican college Applicants

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Food and Nutrition Sciences 2013年第1期4卷 56-65页

作者： Michelle A. Mosley Flavia c. D. Andrade celia Aradillas-garcia Margarita Teran-garcia Department of Food Science and Human Nutrition University of Illinois Urbana USA Department of Kinesiology and community Health University of Illinois Urbana USA Facultad de Medicina Universidad Autónoma de San Luis Potosi San Luis Potosí Mexico.

The rise in metabolic syndrome (MetS) is accompanied by a decrease in milk and dairy consumption and an increase in sugar-sweetened beverage (SSB) consumption, with SSB possibly displacing dairy products in the diet. Our main objective was to determine whether young individuals not meeting the dairy recommendations of 3 servings per day were at greater risk for MetS. In a cross-sectional design, a food frequency questionnaire was answered by Mexican college applicants (n = 339). Medical examination at a primary health care center and evaluation for presence of MetS risk factors was completed as part of an ongoing collaborative project. relative risk analyses were used to assess the impact of meeting or not the dairy recommendations for the presence of MetS. The MetS prevalence was 10. Three-fourths (76%) of participants were not meeting the daily recommendations. Individuals who failed to meet dairy recommendations were at 2.9 times greater risk for MetS when controlling for age, sex, family history of cardiovascular disease and type 2 diabetes, and physical activity. We did not found that SSB were displacing dairy products in the diet. Still, our data support the importance of meeting daily dairy recommendations for the prevention of MetS in young adults.

关键词： Dairy Intake Young Adults Metabolic Syndrome risk Obesity Prevention

Fast preparation route to high-performances textured Sr-doped ca_3co_4O_9 thermoelectric materials through precursor powder modification

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 Materials 2019年第3期62卷 399-406页

作者： Miguel Angel Torres gustavo garcia Idoia Urrutibeascoa Maria Antonieta Madre Juan carlos Diez Andres Sotelo IcMA (cSIc-Universidad de Zaragoza) centro Stirling S. coop. Mondragon Unibertsitatea

This work presents a short and very efficient method to produce high performance textured ca_3co_4O_9 thermoelectric materials through initial powders modification. Microstructure has shown good grain orientation, and low porosity while slightly lower grain sizes were obtained in samples prepared from attrition milled powders. All samples show the high density of around 96% of the theoretical *** similar characteristics are reflected in, approximately,the same electrical resistivity and Seebeck coefficient values for both types of samples. However, in spite of similar power factor(PF) at low temperatures, it is slightly higher at high temperature for the attrition milled samples. On the other hand, the processing time reduction(from 38 to 2 h) when using attrition milled precursors, leads to lower mechanical properties in these samples. All these data clearly point out to the similar characteristics of both kinds of samples, with a drastic processing time decrease when using attrition milled precursors, which is of the main economic importance when considering their industrial production.

关键词： ceramics oxides hot-pressing electrical properties power factor