检索结果-南通市图书馆

维普期刊数据库

Optimization of a Single Flash Geothermal Power Plant Powered by a Trans-Critical Carbon Dioxide Cycle Using Genetic Algorithm and Nelder-Mead Simplex Method

在线全文

学校读者我要写书评

暂无评论

Energy Engineering 2023年第2期120卷 263-275页

作者： Yashar Aryanfar Jorge luis García Alcaraz Department of Electric Engineering and Computation Autonomous University of Ciudad JuárezCiudad JuárezChihuahuaMéxico Department of Industrial Engineering and Manufacturing Autonomous University of Ciudad JuárezCiudad JuárezChihuahuaMéxico

The usage of renewable energies,including geothermal energy,is expanding rapidly *** low efficiency of geothermal cycles has consistently highlighted the importance of recovering heat loss for these *** paper proposes a combined power generation cycle(single flash geothermal cycle with trans-critical CO_(2) cycle)and simulates in the EES(Engineering Equation Solver)*** results show that the design parameters of the proposed system are significantly improved compared to the BASIC single flash ***,the proposed approach is optimized using the genetic algorithm and the Nelder-Mead Simplex *** pressure,steam turbine output pressure,and CO_(2) turbine inlet pressure are three assumed variable parameters,and exergy efficiency is the target *** the default operating mode,the system exergy efficiency was 32%,increasing to 39%using the genetic algorithm and 37%using the Nelder-Mead method.

关键词： Optimization geothermal genetic algorithm Nelder-Mead simplex exergy efficiency

Haarlet analysis of Lipschitz regularity in metric measure spaces

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 2012年第5期55卷 967-975页

作者： AIMAR Hugo BERNARDIS Ana NOWAK luis Departamento de Matemática Facultad de Ingeniería QuímicaUniversidad Nacional del LitoralSanta FeArgentina Instituto de Matemática Aplicada del Litoral Consejo Nacional de Investigaciones Científicas y TécnicasSanta FeArgentina Departamento de Matemática Facultad de Economía y AdministraciónUniversidad Nacional del ComahueNeuquenArgentina

In this note we shall give a characterization of Lipschitz spaces on spaces of homogeneous type via Haar coefficients.

关键词： Lipschitz spaces Haar basis spaces of homogeneous type

维普期刊数据库

Effect of Exogenous Melatonin on Seed Germination and Seedling Growth in Melon(Cucumis melo L.) Under Salt Stress

在线全文

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2019年第2期5卷 79-87页

作者： José luis Casta?ares Carlos Alberto Bouzo Plant Physiology Laboratory Department of Basic Sciences Universidad Nacional de Luján Laboratory of Research in Physiology and Plant Molecular Biology Facultad de Ciencias Agrarias Universidad Nacional del Litoral

An investigation was carried out to evaluate the effect of different application forms and concentrations of melatonin on germination and initial growth of melon plants in several different salinity conditions. We evaluated germination percentage and growth of seedlings and measured total chlorophyll content, relative electrolyte leakage, peroxidase activity, root viability, proline concentration, relative water content,Na^+/K^+ratio in green parts and K^+leakage from roots. Seed germination percentage under salt stress increased with treatments of 10 and50 μmol·L^(-1) melatonin. Seed treatment and plant watering with melatonin at 50 μmol·L^(-1) improved growth parameters and plants showed higher chlorophyll content as well as better biochemical parameters than non-treated plants. Results suggest that melatonin can alleviate the effect of salt stress during seed germination and first stages of plant development.

关键词： melon melatonin salt stress germination antioxidation

维普期刊数据库

Data model extension for security event notification with dynamic risk assessment purpose

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2013年第11期56卷 36-44页

作者： David LOPEZ Oscar PASTOR luis Javier GARCIA VILLALBA Group of Analysis Security and Systems (GASS) Department of Software Engineering and Artificial Intelligence (DISIA) School of Computer Science Universidad Complutense Madrid 28040 Spain

Dynamic risk assessment refers to a risk management framework where frequent updates of risk evaluation information are used to evaluate risk exposure,as close as possible to *** this paper,we present the incident object description exchange format extended model for dynamic risk *** format attempts to overcome the absence of integration and real-time communication between security systems and risk assessment *** model is based on the incident object definition exchange format,which is commonly used in the computer security incident response teams *** data model aims to facilitate a global vision of information systems risk by supplying real-time security events data to risk assessment tools based on renowned *** present a proof-of-concept scenario to demonstrate the usefulness of this integration and the proposed data model,and discuss the expected improvements.

关键词： dynamic risk assessment risk management DRA IODEF-DRA IODEF.

Fragility Assessment of Pre-Northridge Steel Moment Frames Using Finite-Length Plastic Hinge Elements and Concentrated Plasticity Fracture Elements

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2019年第9期120卷 657-676页

作者： Filipe L.A.Ribeiro Andre RBarbosa luis CNeves National Laboratory of Civil Engineering(LNEC)&CERIS-Civil Engineering Research and Innovation for Sustainability DECivilUniversity of LisbonLisbonPortugal School of Civil and Construction Engineering Oregon State UniversityOregonUSA and University of BristolBristolUK Resilience Engineering Research Group University of NottinghamNottinghamUK.

Although pre-Northridge earthquake steel moment resisting frame buildings have been shown to be susceptible to brittle connection failures,they still represent a large fraction of the existing steel buildings in the United States of *** this study,the performance of the 3-and 9-story Los Angeles pre-Northridge SAC buildings are analyzed considering ductile and brittle beam-column connection failures,and their *** paper contributes to understanding the influence of uncertainty associated with connections brittle fracture on building interstory deformation capacity and its impact on bias and variability of fragility functions and loss *** results show that considering brittle connections leads to significantly l arger d rift demands a nd t o h igher r epair costs,particularly under intense ground *** fragility curve parameters are derived that account for the effect of the uncertainty of the strength and deformation capacity of brittle connections.

关键词： Brittle fracture finite-length p lastic h inge f ragility c urves r epair c ost ratio welded-flange connections

Sensitivity,specificity and predictive values of anterior chamber tap in cases of bacterial endophthalmitis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Eye and Vision 2017年第1期4卷 100-105页

作者： Carl Sjoholm-gomez de Liano Vidal F.Soberon-Ventura Guillermo Salcedo-Villanueva Abril Santos-Palacios Jose luis Guerrero-Naranjo Jans Fromow-Guerra Gerardo García-Aguirre Virgilio Morales-Canton Raul Velez-Montoya Retina Department Asociación para Evitar la Ceguera en MexicoHospital“Dr.Luis Sanchez Bulnes”IAPMexico CityMexico Universidad Popular Autonoma del Estado de Puebla PueblaMexico Ophthalmology Department Macula Retina ConsultantsMexico CityMexico

Background:To assess the sensitivity,specificity,positive predictive value and negative predictive value of anterior chamber tap for the diagnosis of bacterial endophthalmitis on a population with high ***:Retrospective,single centre,case series *** reviewed all medical records with clinical diagnosis of bacterial endophthalmitis in our hospital from January 1st,2000 to December 31st *** each record,we documented general demographic data,best corrected visual acuity and vitreous and aqueous tap microbiological *** cases were further divided according to the endophthalmitis aetiology to perform individual calculations of sensitivity,specificity,positive predictive value,negative predictive value,accuracy and *** used the results of the vitreous tap as the gold standard for diagnosis of bacterial *** excluded those records in which the aqueous and vitreous samples were not taken simultaneously or had an incomplete microbiological *** were assessed with chi squared statistics,with an alpha value of 0.05 for statistical ***:A total of 190 cases fulfilled the inclusion/exclusion *** culture rate from vitreous samples was 64.74%.Positive culture rate from aqueous sample was 32.11%.Bacteria isolated from aqueous samples matched those isolated from vitreous samples 78.68%of the *** overall sensitivity was 38.21%,specificity:75.51%,positive predictive value:79.66%,negative predictive value:32.74%(p=0.08).Subgroup analysis showed that anterior chamber taps in cases of post-surgical endophthalmitis had a moderate to low sensitivity(37.73%),high specificity(93%)and high positive predictive value(95%)(p<0.04).Conclusion:The sensitivity and specificity of anterior chamber tap are low and should not be used for critical therapeutic decisions in patients with suspected bacterial *** cases of post-surgical endophthalmitis,the result of an anterior chamber tap

关键词： Aqueous humour Endophthalmitis Anterior chamber tap Diagnostic test Vitreous tap Aqueous sampling Sensibility Sensitivity

Fretting Fatigue Evaluation Produced by A New Vertical Machine

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

材料科学与工程（中英文版） 2010年第2期4卷 26-38页

作者： GuiUermo Urriolagoitia-Sosa Guillermo Urriolagoitia-Calderon luis Hector Hemaindez-gomez Beatriz Romero-Angeles Secci6n de Estudios de Posgrado e lnvestigacion Escuela Superior de lngenieria Mecanica y Electrica lnstituto Politecnico Nacional Unidad Profesional Adolfo Lopez Mateos 5th Building 2nd Floor Lindavista CP 07738 Gustavo A. Madero Mexico D F. Mexico.

It has been well documented in the open literature that fretting fatigue tests are generally performed on machines with horizontal configuration. This kind of configuration has the problem of misalignment between the actuator and the specimen. The misalignment generally occurs on the support of the actuator, which is held by a solid bar in a cantilever beam configuration, caused by the fretting fatigue effect. The present work describes the design and construction of a new vertical fretting fatigue machine. The intention of this work is to solve the misalignment problem observed in the horizontal configuration and to explore the advantages and disadvantages offered by the vertical configuration. In this work, uni-axial and fretting fatigue experiments were run to evaluate the performance of the new apparatus and all the fretting tests were done in a partial slip regime, so that the relative displacement within the contact could be calculated. Furthermore, in this research the damage caused by the relative slip fretting was investigated and the performance of the new vertically mounted coaxial fretting fatigue machine was assessed. The results with compared were those obtained in a horizontal configuration machine and have provided complete confidence on the new design.

关键词：微动疲劳疲劳评价加工生产疲劳试验机立式悬臂梁结构垂直式相对位移

North-South Comparatism:New Worldism,Theories of Lack and Acclimatization

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 Foreign Languages and Cultures 2022年第1期6卷 26-37,155页

作者： Jose luis Jobim Federal Fluminense University

In this essay I will use the expression New Worldism to refer to a particular representation of the New World,developed in Europe.I will take some theories related to this expression(theories of lack and acclimatization)to provide a short introduction to them,taking into special consideration their connection to comparatism as it was developed in 19th-century Brazil.

关键词： North-South Comparatism New Worldism theories of lack theoriesof acclimatization

A Script-Based Prototyping Framework to Boost Agile-UX Developments

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 Computer Science & Technology 2016年第6期31卷 1246-1261页

作者： Pedro luis Mateo Navarro Gregorio Martinez Perez Diego Sevilla Ruiz Catedra Sociedad Anonima de Electrdnica Submarina ( SAES) Laboratories University of Murcia Murcia 30100 Spain

Prototypes are described as a successful mechanism to incorporate user-experience design （UX） into Agile de- velopments, but their integration into such developments is not exempt from difficulties. Prototypes and final applications are often developed using different tools, which hinders the collaboration between designers and developers and also compli- cates reuse. Moreover, integrating stakeholders such as clients and users into the Agile process of designing, evaluating, and refining a prototype is not straightforward mainly because of its iterative nature. In an attempt to tackle these problems, this work presents the design and implementation of a new framework in which scripting languages are used to code prototyped behaviors. Prototyping is then treated as a separate aspect that coexists and runs together with final functionality. Using this framework communication is enhanced because designers and developers work in parallel on the same software artifact. Prototypes are fully reused and iteratively added with final functionality while prototyped behaviors are removed. They can be also modified on the fly to implement participatory design techniques.

关键词： prototype Agile development aspect-oriented development scripting language participatory design