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Thermal conductivity suppression in uranium-doped thorium dioxide due to phonon-spin interactions

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Journal of Materiomics 2024年第3期10卷 709-715页

作者： Zilong hua Saqeeb Adnan Amey R.Khanolkar Karl Rickert David b.Turner Timothy A.Prusnick J.Matthew Mann David h.hurley Marat Khafizov Cody A.Dennett Materials Science and Engineering Department Idaho National LaboratoryIdaho FallsID83415USA Department of Mechanical and Aerospace Engineering The Ohio State UniversityColumbusOH43210USA KbR DaytonOH45431USA Azimuth Corporation FairbornOH45324USA Air Force Research Laboratory Wright-Patterson AFBOH45433USA Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMA02139USA

In this work,impact of low level of uranium(U)atom substitution on thermal conductivity of thorium dioxide(ThO_(2))is ***_(2)is an electronic insulator with a wide optical band-gap and no unpaired electrons whose thermal transport is governed by phonons.U-substitution introduces unpaired f-electrons resulting in paramagnetic b.h.vior of UeThO_(2)at room temperature,which significantly suppresses its thermal conductivity.A single crystal of UeThO_(2)with graded composition of U is grown using a hydrothermal synthesis method,and thermal conductivity measurements are performed in re-gions with uniform composition of U at levels of 0%,6%,9%and 16%.Measured thermal conductivity profiles over 77e300 K temperature range are analyzed using an analytical expression for phonon-mediated thermal transport based on Klemens-Callaway *** dependent thermal con-ductivity is found to deviate significantly from the Rayleigh scattering trend expected for a simple substitutional point defect with a small perturbation to mass and interatomic *** the resonant scattering term,observed large suppression of thermal conductivity at low temperatures can be closely ***,the extracted phonon-spin coupling constants imply a nonlinear relation of phonon-spin interaction intensity with respect to U doping *** study reveals how phonon-spin scattering contributed by unpaired f-electrons in U atoms influences thermal transport in the UeThO_(2)system.

关键词： Phonon-spin interactions Thermal conductivity UdThO_(2)system

Study of ZnO nanoparticle-supported clay minerals for electrochemical sensors,photocatalysis,and antioxidant applications

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ChemPhysMater 2024年第1期3卷 83-93页

作者： Mylarappa M N.Raghavendra N.R.bhumika C.h.Chaithra b.N.Nagalaxmi K.N.Shravana Kumara Department of Chemistry Sri Jagadguru Renukacharya College of ScienceArts&CommerceBengaluru 560009India Department of Chemistry East West Institute of TechnologyBengaluru 560091India Department of Chemistry Maharani Lakshmi Ammanni College for WomenBengaluru 560012India

In view of the current study’s demonstration of the synthesis of clay-doped ZnO composites,we present a low-cost method for producing clay-metal oxide(clay/ZnO).Utilizing the solution combustion technique,a composite of clay/ZnO was produced utilizing citric acid as both a fuel and a complexing *** hexagonal unit cell structure of the created clay/ZnO may be seen using XRD *** ZnO-infused clay was visible in FE-SEM micrographs as homogenous,sphere-shaped *** possible involvement of clay/ZnO photocatalytic activity in the UV-induced photodegradation of malachite green dye was *** 90%degradation rate shows the composite’s outstanding photocatalytic degradation *** resulting substance was electrochemically analyzed using a constructed electrode in 0.1 M KOh *** increased its sensor capabilities,which now include chemical and biomolecule sensors,and it excelled in cyclic voltammetry-based redox potential *** efficiently evaluate chemically synthesized NPs for electrochemical,sensing,and photocatalytic applications,this study intends to create a solution combustion procedure for the synthesis of clay/ZnO nanocomposite using urea as fuel.

关键词： Clay Clay/ZnO Photocatalytic Electrochemical sensors

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铸造生产自动化装置与系统

根据资料统计处理结果确定金矿床指示元素共生组合

丛书名：根据莫斯科《Ｍашиностроение》1981年俄文版译出

1986年

作者：（苏）K·C·保克坦 b.h.高尔宾科 b·M·得尼辛科 Ю·П·卡

本书介绍了铸造生产自动化对象的特性，铸造过程自动化系统的设计原理。分别介绍了熔化设备炉料定量过程，熔化过程、砂处理过程及铸型浇注过程的自动控制系统。最后着重介绍电子计算机在铸造生产过程中的应用。

ISBN: (纸本)15033·6444

关键词：铸造自动化系统

来源：汇雅图书（南通市图书馆... 评论

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国外地质勘探技术 1990年第9期 43-44+49页

作者： b.h.Бондаренко 陆波

本研究的首要任务,是揭示矿体晕范围内的地球化学标型元素共生组合,并确定共生元素相互间的空间位置,以及它们与已知矿体的相对位置。其次是确定在晕的纵轴方向矿化晕和成晕指示元素浓度变化动态的指示关系形式。用敲取法以2.5m间距进... 详细信息

本研究的首要任务,是揭示矿体晕范围内的地球化学标型元素共生组合,并确定共生元素相互间的空间位置,以及它们与已知矿体的相对位置。其次是确定在晕的纵轴方向矿化晕和成晕指示元素浓度变化动态的指示关系形式。用敲取法以2.5m间距进行采样,样品分析用半定量光谱法(试金法)完成。用自动化数据处理系统来解决所提出的课题。地球化学信息处理程序为:1.确定揭示地球化学场规律性分量的最佳滤波参数;2.确定构成研究区各类岩石背景的综合参数,3.在不同岩石类型和不同元素背景水平上,排除对地球化学数据分析结果有影响的条件(数据标准化);4.确定空间成矿和成晕过程所显示的范围;5.成晕过程、指示元素富集及其共生组合所显示的空间强度动态;6.指示元素与晕纵轴方向进行对比的关系。

关键词：指示元素纵轴矩阵标型数学分析共生组合主分量元素含量变量系数

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社会生态学原则的形成

世界哲学 1987年第1期 51-54页

作者： b.h.杜比宁焦平

现代的生态情势是自发地产生的。但克服自然环境恶化,防止生态危机不能只靠自发的方式。克服自发方式的必要的条件和前提应当是探讨生物圈的科学理论和理智层——社会和自然界最佳相互关系区域的形成途径。对研究这一理论起着非常重要... 详细信息

现代的生态情势是自发地产生的。但克服自然环境恶化,防止生态危机不能只靠自发的方式。克服自发方式的必要的条件和前提应当是探讨生物圈的科学理论和理智层——社会和自然界最佳相互关系区域的形成途径。对研究这一理论起着非常重要作用的是马克思列宁主义哲学以及地球表层的一般理论原理,这些原理包含在В.И.维尔纳斯基及其学生的著作中,

关键词：社会生态学维尔纳斯技术圈合理利用生物圈概念思维形式

Storylines of family medicine Ⅰ:framing family medicine–history,values and perspectives

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Family Medicine and Community health 2024年第S03期12卷 2-11页

作者： William b Ventres Leslie A Stone Kathleen T Rowland Richard h Streiffer Michael D Macechko Julia A Roulier Jeffrey M borkan Larry A Green Family and Preventive Medicine University of Arkansas for Medical Sciences College of MedicineLittle RockArkansasUSA Family and Preventive Medicine Rush Medical College of Rush UniversityChicagoIllinoisUSA College of Community health Sciences University of AlabamaTuscaloosaAlabamaUSA UAMS Northwest Regional Campus Family Medicine Residency Program FayettevilleArkansasUSA UAMS North Central Regional Campus Family Medicine Residency Program BatesvilleArkansasUSA Family Medicine Brown University Warren Alpert Medical SchoolProvidenceRhode IslandUSA University of Colorado School of Medicine AuroraColoradoUSA

Storylines of Family Medicine is a 12-part series of thematically linked mini-essays with accompanying illustrations that explore the many dimensions of family medicine,as interpreted by individual family physicians and medical educators in the USA and elsewhere around the ***‘Ⅰ:framing family medicine—history,values,and perspectives’,the authors address the following themes:‘Notes on Storylines of Family Medicine’,‘Family medicine—the generalist specialty’,‘Family medicine’s achievements—a glass half full assessment’,‘Family medicine’s next 50 years—toward filling our glasses’,‘Four enduring truths of family medicine’,‘Names matter’,‘Family medicine at its core’and‘The ecology of medical care.’May readers find much food for thought in these essays.

关键词： glasses illustration Notes

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十八世纪的准噶尔普尔铜钱

新疆钱币 2006年第4期 10-10,14页

作者： b．A．别利亚耶夫 b.h.纳斯提奇张铁山（译）

准噶尔由西蒙古部落（卡尔梅克、卫拉特）于14世纪联合组成，至17世纪建立了准噶尔汗国或卫拉特汗国（1630-1757年）。汗国与周邻-在西部与哈萨克部落，在南部与企图控制新疆的清王朝军队经常发生战争。1700年准噶尔最高汗策妄阿拉布坦... 详细信息

准噶尔由西蒙古部落（卡尔梅克、卫拉特）于14世纪联合组成，至17世纪建立了准噶尔汗国或卫拉特汗国（1630-1757年）。汗国与周邻-在西部与哈萨克部落，在南部与企图控制新疆的清王朝军队经常发生战争。1700年准噶尔最高汗策妄阿拉布坦（1691—1727年在位）进攻新疆南路，并征服了叶尔羌汗国，他下令发行了铸有自己名字的普尔铜钱。这种新钱的一部分作为贡赋运往北疆。策妄阿拉布坦死后，其子噶尔丹策零（1727-1745年在位）也发行了铸有自己名字的钱币，而将旧币以2：1之比兑换成新币。噶尔丹策零死后，没有再发行新币。准噶尔汗国最终于乾隆二十二年（1757年）被清军平定，准噶尔普尔铜钱被改铸成标准的中国式钱币，名为“红钱”（redcash）。“普尔”这一名称在新疆钱币系统中一直延续到19世纪末。

关键词：准噶尔普尔铜钱十八世纪新疆钱币蒙古部落 19世纪末 14世纪

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黑木耳猴头菇乳酸发酵饮料的配方及工艺研究

中国食物与营养 2024年第10期30卷 16-19页

作者：陈香利吴秦柔毛雪孔祥辉何建芬黑龙江省科学院微生物研究所哈尔滨150010 东北农业大学食品学院哈尔滨150036 浙江省龙泉市食药用菌服务站浙江龙泉323700

目的:以黑木耳、猴头菇多糖提取液为原料,低聚木糖为辅料,确定黑木耳猴头菇乳酸发酵饮料的最佳工艺。方法:以总酸含量为评价指标,采用单因素试验和正交试验优化该饮料工艺。结果和结论:黑木耳-猴头菇复合发酵饮料的最优工艺条件为发酵时... 详细信息

目的:以黑木耳、猴头菇多糖提取液为原料,低聚木糖为辅料,确定黑木耳猴头菇乳酸发酵饮料的最佳工艺。方法:以总酸含量为评价指标,采用单因素试验和正交试验优化该饮料工艺。结果和结论:黑木耳-猴头菇复合发酵饮料的最优工艺条件为发酵时间72h、乳酸菌接种量10g/L(乳酸菌A∶b为2∶1),猴头菇与黑木耳浸提液配比3∶2(g∶g),为黑木耳和猴头菇的深加工应用拓宽了思路。

关键词：黑木耳猴头菇低聚木糖乳酸菌发酵饮料

A Comprehensive Review on Charging Topologies and Power Electronic Converter Solutions for Electric Vehicles

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 675-694页

作者： Abdelfatah Ali hossam h.h.Mousa Mostafa F.Shaaban Maher A.Azzouz Ahmed S.A.Awad the Department of Electrical Engineering American University of Sharjah26666 SharjahUnited Arab Emirates the Department of Electrical Engineering South Valley University83523 QenaEgypt the Department of Electrical and Computer Engineering University of WindsorWindsorON N9B 3P4 Canada Electrical Engineering Department Qatar UniversityDoha 2713Qatar Department of Electrical and Computer Engineering Sultan Qaboos UniversityMuscat123Oman

Electric vehicles(EVs)are becoming more popular worldwide due to environmental concerns,fuel security,and price *** performance of EVs relies on the energy stored in their batteries,which can be charged using either AC(slow)or DC(fast)***,EVs can also be used as mobile power storage devices using vehicle-to-grid(V2G)*** electronic converters(PECs)have a constructive role in EV applications,both in charging EVs and in ***,this paper comprehensively investigates the state of the art of EV charging topologies and PEC solutions for EV *** examines PECs from the point of view of their classifications,configurations,control approaches,and future research prospects and their impacts on power *** can be classified into various topologies:DC-DC converters,AC-DC converters,DC-AC converters,and AC-AC *** address the limitations of traditional DC-DC converters such as switching losses,size,and high-electromagnetic interference(EMI),resonant converters and multiport converters are being used in high-voltage EV ***,power-train converters have been modified for high-efficiency and reliability in EV *** paper offers an overview of charging topologies,PECs,challenges with solutions,and future trends in the field of the EV charging station applications.

关键词： Charging station charging topology electric vehicle power electronic converter vehicle-to-grid