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Polygeneration Study of Low-to-Medium Enthalpy Geothermal Reservoirs in Mexico

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Journal of Thermal Science 2021年第3期30卷 1077-1087页

作者： chÁVEZ Oscar GODÍnEZ Francisco Tecnológico nacional de México/I.T.chihuahua.Av.Tecnológico 2909 C.P.31310ChihuahuaChihuahuaMéxico Instituto de Ingeniería Universidad Nacional Autónoma de MéxicoUNAMC.U.Ciudad de MéxicoC.P.04510México Polo universitario de Tecnología Avanzada Universidad Nacional Autónoma de MéxicoVía de la Innovación No.410Autopista Monterrey-Aeropuertokm.10 PIITC.P.66629Apodaca Nuevo LeónMéxico

This study combines the thermodynamic analysis of a polygeneration system along with the numerical modelling of the thermal behavior of geothermal reservoirs in Mexico to exploit their *** reservoir was modeled as a porous medium assuming a five-spot well configuration and local thermal *** heat conduction-convection along with the Laplace equations were solved to compute temperature distributions,the useful life and the optimum distance between injection-extraction *** predicted temperature and pressure of the geothermal fluid at the outlet of the reservoir were exploited in the polygeneration system consisting of:(1)a Rankine cycle,(2)an absorption refrigeration cycle,and(3)a heat *** developed approach allows calculating both the optimal distance between injection-extraction wells and the global(utilization)efficiency of six arrangements(each composed by a reservoir connected to a polygeneration system)by assuming that reservoirs have a lifespan of 30 *** also show that:(a)due to the low efficiency of the Rankine cycle,very little thermal energy is converted into electrical one;(b)not only the temperature and the size are important when evaluating the power production performance of reservoirs,but also the permeability plays a fundamental role;(c)the first law efficiency of the polygeneration system ranges from 41.9%to 43.7%;(d)the utilization efficiency of the six arrangements lies in the range between 25.8%and 31%.

关键词： polygeneration system geothermal reservoir local thermal equilibrium low-to-medium enthalpy

减污降碳视角下空间密度的环境效应——突破行政单元的再讨论

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经济学动态 2024年第7期 111-127页

作者：张麒吴胜男张学良中南财经政法大学经济学院 430073 上海财经大学长三角与长江经济带发展研究院 200433

优化人口空间布局、协同推进减污和降碳,是实现中国式现代化的重要内容。本文突破行政单元约束,以超过一定人口密度阈值的网格单元作为空间观测对象,并构建2000—2020年中国19大城市群栅格数据集,精准探讨空间密度变化对减污降碳的影响... 详细信息

优化人口空间布局、协同推进减污和降碳,是实现中国式现代化的重要内容。本文突破行政单元约束,以超过一定人口密度阈值的网格单元作为空间观测对象,并构建2000—2020年中国19大城市群栅格数据集,精准探讨空间密度变化对减污降碳的影响及作用机制。研究发现,网格单元空间密度对PM2.5与人均碳排放的影响均呈“倒u”型趋势,拐点值分别为3718人/km2和4128人/km2。这主要受四大作用机制影响,即城市用地变迁、生态空间演变、生产方式优化和交通设施变化。进一步分析空间密度的规模效应与结构效应表明,规模效应的主导地位造就了密度与环境的非线性关系,这为相关研究争论提供了新的解释。本文也为如何从空间布局层面推动减污降碳协同增效提供了政策启示。

关键词：空间密度减污降碳网格单元城市群

Evaluation of ligninolytic activity in spent mushroom substrate from four cultivated mushrooms

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Journal of Bioresources and Bioproducts 2022年第4期7卷 288-294页

作者： Ana Marión Pérez-chávez María Melisa Alberti Edgardo Albertó Laboratory of Mycology and Mushroom Cultivation.Instituto Tecnológico de chascomús(InTEch) Universidad Nacional de San Martín(UNSAM)-Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET)Intendente Marino AveCC 164.7130ChascomúsBuenos AiresArgentina

Spent mushroom substrate(SMS)is an abundant residue generated by the mushroom industry,which is mostly *** this study,the SMS of four cultivated mushrooms were evaluated as potential sources of ligninolytic *** ostreatus,***,*** and Ganoderma lucidum were cultivated in two different substrates to determine growth,mushroom yields and ligninolytic activity of laccase(Lac)and manganese peroxidase(MnP).Maximum activities in the SMS were 3.731 u/g Lac and 0.191 u/g MnP,both for *** mushroom substrates were also analyzed,and higher activities were found in almost all samples.A correlation test between mushroom yields and ligninolytic activities of each culture was made,and we found that high enzymatic activity in the substrate did not result in high mushroom productivity or vice *** SMS was a good source of ligninolytic *** activity depended on the mushroom species and its affinity to the substrate,and it was not influenced by the mushroom *** of mushrooms in diverse lignocellulosic substrates is gaining interest,and ob-taining ligninolytic enzymes from residual SMS is an excellent alternative in the circular economy concept.

关键词： Laccase Manganese peroxidase Biological efficiency Pleurotus spp Ganoderma lucidum Circular economy

Kinetic Instability of Anisotropic Drift Wave Accompanied by Field Aligned Currents in Solar Coronal Loop

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Communications in Theoretical Physics 2018年第10期70卷 470-476页

作者： Hafsa naim ch.uzma G.Murtaza Salam chair Department of Physics GC University

Solar coronal loops are frequently accompanied by the field-aligned currents, which drive instabilities if the drift velocity u0 > v A the Alfv′en velocity. For our choice of parameters, the critical threshold value of u0/v A is ～ 3.0 for growth and the corresponding current filling factor ～ 10-3-10-4. Below this value we are no longer in the kinetic *** coronal loops also have short-scale density gradients within each loop. The electron resonance in the presence of density gradient causes the drift mode to grow. We study the effect of these two free energy sources, the electron drift and the density gradient, in the presence of temperature anisotropy T⊥_α > T∥_α. These effects simultaneously exist in the coronae. using gyrokinetic theory, we investigate the influence of these effects, examine how they interplay with each other and study the consequent growth of the magnetosonic wave. We observe that kinetic instability driven by density gradient can be suppressed by field-aligned currents. The temperature anisotropy with chosen signatures causes further stabilizing effect. The results may prove useful to study the heating mechanism of solar coronal loops, acceleration of particles and confinement of particles in the thermonuclear reactors.

关键词： solar corona coronal loops temperature anisotropy density inhomogeneity field-aligned currents gyrokinetic

Ac voltammetric and square wave voltammetric study of the self-assembled monolayers of thiol-functionalized viologen derivative

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chinese Journal of chemistry 1997年第2期15卷 130-137页

作者： Li, JH Yang, ch Yan, JC chen, WQ Dong, SJ chInESE ACAD SCI CHANGCHUN INST APPL CHEMELECTROANALYT CHEM LABCHANGCHUN 130022JILINPEOPLES R CHINA

Electroactive self-assembled monolayers (SAMs) containing viologen group are formed through the adsorption of thiol-functionalized viologen compound ch3(ch2)(9)V2+(ch2)(8)sh, where V2+ is n,n'-dialkylbipyridinium (i.e. a viologen group), onto gold electrodes from methanol/water solution and its electrochemical behavior is investigated ty Ac voltammetry and square wave voltammetry, which have the high sensitivity against background charging. The viologen SAM formed is a sub-monolayer and the normal potentials corresponding to the two successive one-electron transfer processes of the active centers (viologen) are -360 mV and -750 mV (vs. Ag/AgCl) in 0.1 mol/L phosphate buffer solutions (pH 6.96) respectively, and the standard electron transfer rate constant is 9.0 s(-1). The electrochemical behavior of this SAM in various solutions has been preliminarily discussed.

关键词： self-assembled monolayers viologen Ac voltammetry square wave voltammetry

汉—越委婉语对比分析及对越南汉语委婉语教学研究

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汉—越委婉语对比分析及对越南汉语委婉语教学研究

作者：丁阮宝珠（Dinh nguy(?)n B(?)o ch(?)u）广东外语外贸大学

学位级别：硕士

委婉语是人类语言的一种普遍现象，它是人际交往的重要组成部分。对汉语和越南语委婉语进行对比研究不仅有助于增加越南学习者对汉语委婉语的了解，而且能有效提高他们的汉语交际能力。本文在前人研究的基础上，对汉语和越南语委婉语之... 详细信息

委婉语是人类语言的一种普遍现象，它是人际交往的重要组成部分。对汉语和越南语委婉语进行对比研究不仅有助于增加越南学习者对汉语委婉语的了解，而且能有效提高他们的汉语交际能力。本文在前人研究的基础上，对汉语和越南语委婉语之间的异同进行了对比研究，并提出一些教学建议。全文共分为五个部分：第一章：绪论，主要是关于委婉语的理论介绍，包括汉语委婉语界定、越南语委婉语界定、汉-越委婉语所指范围的界定，研究综述、目的、方法和意义;第二章：汉语和越南语委婉语的对比，通过比较分析二者的相似性与差异性;第三章：越南学习者学习汉语委婉语的情况调查及分析;第四章对越南学习者进行汉语委婉语教学的对策;第五章结语。希望本文能帮助越南学习者更好地认识、理解和掌握汉语委婉语，更深入地了解中国文化，帮助越南学习者提高他们的汉语水平。此外，希望本研究能有助于促进中越两国文化之间的交流。

关键词：汉语越南语委婉语对比教学

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广东农村居民消费结构变化的实证分析

消费经济 2005年第6期21卷 54-57页

作者：丁元周树高暨南大学广东广州510632 广东技术师范学院广东广州510665

本文从各类支出比重、消费结构变动度等方面分析了广东农村居民消费结构的变化。同时,又运用ELES对广东农村居民的消费倾向和需求弹性进行了实证研究,结果表明可根据消费倾向变化、降价和提高居民收入来有效促进消费需求。

关键词：广东农村居民消费结构实证分析

Evaluation of Dynamic Modulus of HMA Sigmoidal Prediction Models and Optimization by Approach of u.S. Mesh Sieve by AFnOR and LC Mesh Sieve

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Open Journal of Civil Engineering 2020年第3期10卷 195-212页

作者： Mouhamed Lamine chérif Aidara Makhaly Ba Alan Carter uFR Sciences de l’Ingénieur Université de Thiès Thiès Sénégal Ecole de Technologie Supérieure (ETS) Director of Pavement BituminousMaterials Laboratory (LCMB) Montréal Canada

Pavement design tools are not universal. Indeed, in the sizing of pavements in the uSA, the prediction models used in the calculation of the dynamic modulus of HMA are not adapted to the characterization of the mineral skeleton of the HMA mix designed with the French method. This article aims to assess the predictive models of the dynamic modulus used in the mechanistic-empirical design for their use in the design of bituminous pavements, and to develop new predictive models taking into account the sieve series LC and AFNOR standards. A total of six types of mixtures were subjected to the determination of complex modulus testing by direct tensile-compression on cylindrical specimens (26-700 LC) over a temperature range (5) and frequency (5) data. Dynamic modulus prediction models |E*| are studied Witczak model 1999 and model Witczak 2006. These models do not take into account the AFNOR or LC mesh sieve, an approach was made in relation to the US mesh sieve to replace ρub>200ub> (0.075 mm), ρub>4ub> (4.76 mm), ρub>38ub> (9.5 mm) and ρub>34ub> (19 mm) respectively by the AFNOR mesh Pub>0.08ub>n style="font-family:Verdana;"> (0.08 mm), <

关键词： Dynamic Modulus Mechanistic-Empirical Design uS Sieve Mesh HMA AFnOR LC

Proposals Concerning the Modifications of “Amount of substance”,“mole” ɑnd the Definition and Symbol of Avogadro Constant.

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计量与测试技术 1998年第3期 35-38页

作者： Renyi　sh.n(neijiɑng　children　Middle　School　of　the　no.2　Rɑilwɑy　Engineering　Bureɑu,Mɑ’ɑnsh.n,neijiɑng,Sichuɑn　Province,641000)

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关键词： ɑmount of structurɑl pɑrticle Avog Av