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厂区布置对钢塔自然通风空冷凝汽器性能的影响

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汽轮机技术 2024年第4期66卷 279-282页

作者：石磊汪建平余喆沈栋张丽北京交通大学土建学院北京100044 江苏双良冷却系统有限公司江阴214444

利用计算传热学(NHT)软件FLUENT,在自然通风状态下,对2×350MW机组钢结构外覆铝板冷却塔及直接空冷凝汽器(DACC)的流动和换热性能进行了数值模拟、分析和研究。确定了考核工况,不同环境风向下,周边建筑物对DACC和钢塔性能的影响。结果表... 详细信息

利用计算传热学(NHT)软件FLUENT,在自然通风状态下,对2×350MW机组钢结构外覆铝板冷却塔及直接空冷凝汽器(DACC)的流动和换热性能进行了数值模拟、分析和研究。确定了考核工况,不同环境风向下,周边建筑物对DACC和钢塔性能的影响。结果表明,两机一塔水平矩形布置方式下,平行于A列的来风对钢塔通风和DACC换热有负面影响。不考虑风向频率时,各风向下周边建筑物对DACC总体换热影响约为2.4%。在电厂总平面布置时,应尽量使厂区主导风向避开不利风向,汽机房空冷塔间距还需综合其它因素确定。

关键词：直接空冷凝汽器钢塔布置方式自然通风数值模拟

灌溉与有机肥处理对冬小麦水分利用效率的影响

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中国土壤与肥料 2024年第3期 144-152页

作者：李斌宿顺顺冯浩吴淑芳胡亚瑾王建平西北农林科技大学水利与建筑工程学院陕西杨凌712100 北京良乡蓝鑫水利工程设计有限公司北京102488 延安市宝塔区果业局陕西延安716000

探究不同灌溉量和有机无机肥配施的组合处理对冬小麦生长及水分利用效率的影响,为冬小麦的科学施肥管理提供参考。以关中地区冬小麦‘小偃22’为研究对象,通过田间试验,采用等氮原则对有机肥与无机肥进行不同比例配施(F1,100%无机肥;F2,... 详细信息

探究不同灌溉量和有机无机肥配施的组合处理对冬小麦生长及水分利用效率的影响,为冬小麦的科学施肥管理提供参考。以关中地区冬小麦‘小偃22’为研究对象,通过田间试验,采用等氮原则对有机肥与无机肥进行不同比例配施(F1,100%无机肥;F2,24%有机肥+76%无机肥;F3,48%有机肥+52%无机肥),结合2个水平的灌溉(充分灌溉W1和亏缺灌溉W2),共设计6个灌溉施肥组合处理(W1F1、W1F2、W1F3、W2F1、W2F2和W2F3)。通过测定冬小麦的生长指标(植株株高和叶面积指数)、0~200 cm土层土壤体积含水率(以20 cm为深度间隔)和小麦的产量及构成要素(干物质量、穗长、有效穗数、千粒质量和籽粒产量),分析灌水量与有机无机肥配施对冬小麦生长及水分利用效率(WUE)的影响。结果表明:(1)充分灌溉(W1)条件下,F2、F3处理株高较F1处理分别提高3.4%~21.2%和0.8%~15.9%,叶面积指数提高5.7%~18.5%和16.8%~47.4%,干物质量提高12.1%~26.1%和21.1%~36.0%,穗长提高12.5%和14.5%,有效穗数提高6.6%和9.3%,千粒质量提高18.3%和24.4%,籽粒产量提高14.8%和28.6%,WUE提高14.6%和27.5%;亏缺灌溉(W2)条件下,与F1处理相比,F2、F3处理株高分别提高8.5%~16.2%和0.5%~10.6%,叶面积指数提高4.9%~20.7%和17.0%~50.0%,干物质量提高7.7%~25.7%和15.0%~34.6%,穗长提高12.3%和18.5%,有效穗数提高7.4%和18.0%,千粒质量提高15.3%和25.1%,籽粒产量提高13.1%和31.8%,WUE提高21.4%和35.2%。在相同灌溉水平下,有机无机肥配施处理可以提高土壤体积含水率。(2)W2F2处理对冬小麦株高增长最有效,灌浆期达最大值,较W1F1处理增长10.4%;W2F3处理对冬小麦叶面积指数、干物质量、穗长、有效穗数、千粒质量影响最大,成熟期较W1F1处理分别提高23.6%、39.0%、20.3%、18.4%和33.1%。(3)W2F3处理对冬小麦籽粒产量和WUE的影响最为显著,W1F1、W1F2、W1F3、W2F1和W2F2处理籽粒产量分别提高了35.5%、18.0%、5.3%、31.8%和16.6%;W1F1、W1F2、W1F3、W2F1和W2F2处理WUE分别提高了52.6%、33.2%、19.7%、35.2%和21.4%。亏缺灌溉与48%有机肥+52%无机肥组合处理的冬小麦籽粒产量和WUE最高,该灌溉施肥管理方案为关中平原及环境相似地区冬小麦的科学施肥管理提供了科学依据。

关键词：亏缺灌溉有机无机肥配施冬小麦产量水分利用效率

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陕西省柞水县北川沟铜矿成矿地质特征及控矿因素与找矿标志

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世界有色金属 2024年第3期 44-46页

作者：黎伟峰王建平刘婉嫔商洛西北有色七一三总队有限公司陕西商洛726000

北川沟铜矿区位于柞(水)-山(阳)泥盆纪热水沉积盆地中部,区域性凤镇-山阳深大断裂北侧,处于柞水-山阳菱铁多金属成矿带中段。此成矿带产于中泥盆统大西沟组地层中、上段中,印支-燕山期强烈的造山运动,形成了一系列近东西向断裂构造,并... 详细信息

北川沟铜矿区位于柞(水)-山(阳)泥盆纪热水沉积盆地中部,区域性凤镇-山阳深大断裂北侧,处于柞水-山阳菱铁多金属成矿带中段。此成矿带产于中泥盆统大西沟组地层中、上段中,印支-燕山期强烈的造山运动,形成了一系列近东西向断裂构造,并使矿源层中成矿物质活化,迁移于有利的构造部位富集形成热水沉积-改造型矿床。本文对北川沟铜矿地质特征、物化探资料进行分析,总结其控矿因素与找矿标志,希望能为今后在本区找矿工作提供借鉴。

关键词：铜矿成矿地质特征控矿因素找矿标志北川沟柞水县陕西省

Bi_(2)S_(3) nanofiber bunch for highly efficient CO_(2) electroreduction to formate at low overpotential

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Rare Metals 2024年第7期43卷 3391-3399页

作者： Li wang Wen-Ke Gui Shan jiang Liang wang jian-ping Yang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Centre for Catalysis and Clean Energy Griffith UniversityGold Coast CampusGold CoastQLD 4222Australia

Electrochemical conversion of CO_(2) into valuable chemicals represents a promising strategy to alleviate the environmental issues caused by excessive CO_(2) levels in the *** this work,Bi_(2)S_(3) with different morphologies have been fabricated via facile hydrothermal method to investigate the CO_(2) electrochemical reduction process.

关键词： process. facile Electrochemical

厚植“三农情怀”,建设“四有”课程——在新农科背景下的植物生理学课程教学创新探索

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陇东学院学报 2024年第5期35卷 115-120页

作者：孙萍李胜马绍英王建平李朝周魏小红武季玲甘肃农业大学生命科学技术学院甘肃兰州730070

《植物生理学》是研究植物生命活动规律及其代谢机理与发展趋势的一门学科,是高等农林院校一门重要的专业基础课和必修课。在教学过程中,发现学生专业自信不足、课程内容过于冗杂滞后、学生缺乏学习的主观能动性以及教学中缺少对实践能... 详细信息

《植物生理学》是研究植物生命活动规律及其代谢机理与发展趋势的一门学科,是高等农林院校一门重要的专业基础课和必修课。在教学过程中,发现学生专业自信不足、课程内容过于冗杂滞后、学生缺乏学习的主观能动性以及教学中缺少对实践能力、探究力的培养等课程“痛点”“难点”。课程团队通过加强思政建设,厚植“三农”情怀;更新教学内容,重构、完善课程体系;强化科技创新师资队伍建设;开展多元化的教学方法;强化科技创新实践活动及完善考核体系等措施,有效地解决了目前课程教学存在的问题,有助于课程质量和学生学习效果的持续提升,为培养符合新农科背景下的新型复合型人才奠定了基础。

关键词：新农科建设植物生理学教学创新课程思政多元化

A method for support stiffness failure identification in a steel spring floating slab track of urban railway: a case study in China

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第3期25卷 206-222页

作者： Junyuan ZHENG Caiyou ZHAO Duojia SHI ping wang jian wang Bolong jianG Xi SHENG Key Laboratoryof High-speed Railway Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 60031China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China 01 DYNA(Qingdao)Test&Data Co. Ltd.Qingdao 266000China Rail Transit Digital Construction and Measurement Technology National Engineering Research Center China Railway Design CorporationTianjin300308China Institute of Urban Smart Transportation&Safety Maintenance Shenzhen UniversityShenzhen 518060China

The extensive use of steel spring floating slab tracks has effectively addressed the challenge of alleviating the environmental vibrations induced by urban rail transit ***,under the combined action of train dynamic loads and complex environmental factors,problems,such as the fracture of steel spring vibration isolators and suspension vibrations induced by the uneven settlement of the base,often *** failure of isolator support stiffness is often hidden in its early stages and is challenging to identify by conventional detection *** the same time,it will aggravate the wheel-rail interaction,accelerate the deterioration of track structure,and even affect the driving *** study first establishes a detailed coupled train-floating slab track-foundation analytical *** the influence of the vibration isolator support stiffness failure on the dynamic indices of the floating slab track system response is analyzed.A set of defect identification methods that can detect the number of failed steel springs,severity of damage,and their location is ***,an intelligent monitoring system for support stiffness of floating slab track is built by combining the density-based spatial clustering of applications with noise algorithm and statistical data analysis and is applied to a rail line in southern *** a three-year monitoring campaign,a suspension failure and a fracture of a steel spring were each successfully detected and detailed failure information was *** investigation results were consistent with the damage identification *** repair,the track structure dynamic response returned to the average pre-damage level and further deterioration had been *** proposed damage identification methods and monitoring system provide an approach for intelligent identification of track structure support stiffness failures.

关键词： Floating slab track Support stiffness Detailed analytical model Failure identification Monitoring system

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新时代车辆工程专业人才培养方案研究

湖北第二师范学院学报 2024年第2期41卷 72-76页

作者：张荣芸王建平潘家保吕寅潘道远安徽工程大学机械工程学院安徽芜湖241000 安徽工程大学计算机与信息学院安徽芜湖241000

为满足新时代汽车行业新技术新业态对汽车专业人才的需求,应以“卓越工程师计划”的实践为基础,将新时代课程思政教育元素融入教育全过程,建立健全以现代产业学院或双创学院为平台的政校企三方协同的育人机制,培养未来新兴产业和新经济... 详细信息

为满足新时代汽车行业新技术新业态对汽车专业人才的需求,应以“卓越工程师计划”的实践为基础,将新时代课程思政教育元素融入教育全过程,建立健全以现代产业学院或双创学院为平台的政校企三方协同的育人机制,培养未来新兴产业和新经济需要的实践能力强、创新能力强、具备国际竞争力的高素质新工科复合应用型车辆工程专业人才。

关键词：车辆工程新工科协同育人机制人才培养方案

Reaction mechanism between Al_(2)O_(3)–MgO refractory materials and rare earth high-carbon heavy rail steel

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Journal of Iron and Steel Research(International) 2024年第5期31卷 1153-1163页

作者： Yi wang Guang-jie Song ping Shen jian-zhong He Da-xian Zhang jian-xun Fu Center for Advanced Solidification Technology(CAST) School of Materials Science and EngineeringState Key Laboratory of Advanced Special SteelShanghai UniversityShanghai200444China State Key Laboratory of Baiyunebo Rare Earth Resources Research and Comprehensive Utilization Baotou014030Inner MongoliaChina Inner Mongolia Baotou Steel Union Co. Ltd.Baotou014030Inner MongoliaChina

Submerged entry nozzle(SEN)clogging is a major problem affecting the production quality of rare earth steel,and finding a suitable refractory outlet can significantly reduce production *** explore the relationship between refractory composition and interface interaction,unprotected coated Al_(2)O_(3)–MgO refractories and SiO2-coated Al_(2)O_(3)–MgO refractories were added to rare earth high-carbon heavy rail steel under laboratory conditions,and the Al_(2)O_(3)–MgO refractory was found to be more *** results show that,from the epoxy resin side to the refractory side,the contour of the refractory interface reaction layer can be divided into two main layers:an iron-rich reaction layer and an iron-poor reaction *** based on the spherical model suggest that the adhesion force is proportional to the size of the refractory particles and inclusions,and the same result applies to the surface *** the inclusions at a smaller size has a specific effect on alleviating the erosion of *** with the erosion mechanism of Al_(2)O_(3)–MgO refractories,the interface reaction mechanism between Al_(2)O_(3)–MgO refractories and molten steel was proposed,which provides ideas for solving SEN clogging.

关键词： Rare earth high-carbon heavy rail steel Al_(2)O_(3)-MgO refractory Adhesion Surface tension Interface interaction

Asymmetric reversible structural switching of a diene coordination polymer promoted by UV-visible light

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Science China Chemistry 2024年第2期67卷 536-541页

作者： Yong wang Qiaoqiao Zhang Yong-Yong Cao Qi Liu Brendan F.Abrahams jian-ping Lang College of Chemistry Chemical Engineering and MaterialsSoochow UniversitySuzhou215123China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai200032China College of Biological Chemical Science and EngineeringJiaxing UniversityJiaxing314001China School of Chemistry University of MelbourneVictoria3010Australia

In natural and artificial systems,reversible reactions are commonly asymmetric with respect to the time scale and nature of the stimuli which drive the forward and backward *** applications for which switching behavior is required,it is desirable that the reversible reaction goes as close to symmetric as possible;however,such systems are ***,we report an example of ultraviolet(UV)-visible light-regulated asymmetric reversible structural switching involving a diene-based coordination polymer,CP1 and its monocyclobutane product,*** is possible to cycle at least ten times through a forward [2+2] photocycloaddition reaction and the reverse,photocleavage reaction.A single cycle can be completed within a few *** transformation is accompanied by fast and distinct fluorescence changes,arising from optimisation of the reaction *** functional theory calculations allow rationalisation of the asymmetric reversible transformation between CP1 and CP1a rather than between CP1 and its dicyclobutane product *** work provides a clear illustration of reversible structural switching which approaches symmetric behaviour with respect to reaction rate and *** insights gained from this work also assist in the design of fast,reversible switching materials.

关键词： asymmetrical reversible structural switching coordination polymer photocycloaddition UV-visible light-controlled fluorescence switching