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接触网18号无交叉线岔提速改造工程实践

中国铁路 2024年第1期 83-91页

作者：倪俊琪张翔鸥张羽腾杨宾汇中国铁路成都局集团有限公司贵阳供电段贵州贵阳550002 中国铁路成都局集团有限公司供电部四川成都610081

无交叉线岔是高速铁路接触网的关键设备,是受电弓在正、侧线之间转换的纽带,受电弓运行安全对弓网匹配提出了较高要求。贵广铁路实施提质达标改造施工,运行速度从现有250 km/h提高到300 km/h,重点对接触网18号无交叉线岔“小拉出值”布... 详细信息

无交叉线岔是高速铁路接触网的关键设备,是受电弓在正、侧线之间转换的纽带,受电弓运行安全对弓网匹配提出了较高要求。贵广铁路实施提质达标改造施工,运行速度从现有250 km/h提高到300 km/h,重点对接触网18号无交叉线岔“小拉出值”布置改为“大拉出值”布置的改造项目进行论述。对2种布置方式的18号无交叉线岔结构、线岔与道岔的空间位置、弓网过渡匹配等进行分析,围绕既有高铁接触网施工安全和设备运行安全,从施工方案、施工准备、施工重难点控制等方面,归纳既有高铁接触网18号无交叉线岔提速改造中的重难点问题及其控制方案,可为类似改造项目提供参考。

关键词：接触网无交叉线岔拉出值提速改造施工

维普期刊数据库博看期刊

Directional amine-based solvent extraction for simultaneous enhanced water recovery,salt separation and effective descaling from hypersaline brines

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Frontiers of Environmental Science & Engineering 2024年第3期18卷 83-92页

作者： Yuyao zhang Litao Jia Jin Zhao Xuming Liu Shuyu Dong Chuanyang Liu Yuanyuan Cui Shougang Research Institute of Technology Beijing 100043China Research Center of Environmental Technology in water Pollution Source Identification and Precise Supervision School of EnvironmentTsinghua UniversityBeijing 100084China

The feasibility of simultaneous water recovery,salt separation and effective descaling of hypersaline brine was investigated by diisopropylamine(DIPA)-based directional solvent extraction(DSE),using diluted/concentrated seawater with initial saline concentration range of 12–237 g/L at extraction temperatures of 5 and 15℃,*** water recovery shows an obvious boundary at saline concentration of 115 g/L under dual effect of specific water extraction efficiency and extraction *** Cl^(–) ion concentration in product water is in sharp contrast to the nearly complete removal of SO_(4)^(2–)and hardness ions,indicating that DIPA-based DSE process indeed achieved efficient separation and purification of Cl^(–) ion from hypersaline ***,the radical precipitation of Mg^(2+)and Ca^(2+)ions in form of Mg(OH)_(2)and CaCO_(3)demonstrates effective descaling potential,although it leads to more DIPA residues in dewatered raffinate than product ***,an exponential correlation between the Cl^(–) removal efficiency and specific water extraction efficiency further reveals the intrinsic relationship of water extraction process and transfer of Cl^(–) ion to the product ***,the study provides a novel approach for integrating the water recovery and separation of Cl^(–) ion from ultra-high-salinity brines with radical precipitation of Mg^(2+)and Ca^(2+) ions in one step.

关键词： Hypersaline brines Directional solvent extraction Salt separation Ca^(2+)and Mg^(2+)descaling

Modification of separators with neodymium oxide/graphene composite to enhance lithium-sulfur battery performance

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Journal of Rare Earths 2024年第9期42卷 1730-1739,I0004页

作者： Liyuan Zheng Zhijun Zhu Yutong Kuai Qiaotong Huang Mingkun zhang Yi w.ng Aiju Li School of Chemistry South China Normal UniversityGuangzhou510006China Department of Mechanic and Electronic Engineering Zhongkai University of Agriculture and EngineeringGuangzhou510225China

Lithium-sulfur(Li-S) batteries have generated significant attention due to their high theoretical specific capacity and energy density among a host of energy storage power ***,the lithium polysulfide dissolution shuttle that occurs within Li-S batteries will lead to capacity deterioration and inadequate cycling *** the paper,we proposed a measure to deal with the above problems by modifying the separator with nd_(2)O_(3)/graphene composite in Li-S ***'s special chemical properties and structural qualities make it an excellent choice for Li-S ***,nd_(2)O_(3) has a strong binding affinity with lithium polysulfide due to its low electronegativity,which exhibits Lewis' s acidity and forms strong interactions with lithium polysulfide,which is strongly Lewis *** utilizing these advantageous properties,Li-S batteries assembling nd_(2)O_(3)-decorated reduced graphite oxide modified polypropylene separators(nd_(2)O_(3)/RGO/PP) demonstrate outstanding electrochemical performance,including a mere 0.0525% capacity attenuation rate under 2C during 1000 cycles and with exceptional rate performance of 614 mAh/g even at *** study presents valuable knowledge for effectively modifying separators using rare earth oxides to incorporate graphene,ultimately promoting the practical application of Li-S batteries.

关键词： Lithium-sulfur battery Rare earths neodymium oxide Graphene Modified separator

维普期刊数据库

Controlling hydrogenation of C=C and C=O bonds in cinnamaldehyde using Pt_(1)/ni and Pt_(1)/Co single-atom alloy catalysts

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Rare Metals 2024年第6期43卷 2859-2868页

作者： Huan-Shi Lan Yi-Da Yang Qing-Di Sun Hao zhang Ying zhang Qian He Ran Chen Guo-Yi Bai Xiao-Hui He Hong-Bing Ji School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China Key Laboratory of Bioinorganicand Synthetic Chemistry of Ministry of Education Fine Chemical Industry Research InstituteSchool of ChemistryIGCMESun Yat-sen UniversityGuangzhou510275China UBFC CNRSENSMMFEMTO-ST Institute25030 Besancon CEDEXFrance College of Chemistry and Materials Science Hebei UniversityBaoding 071002China State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology Institute of Green Petroleum Processing and Light Hydrocarbon ConversionCollege of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014China

Selective hydrogenation of C=C and C=O bonds in cinnamaldehyde(CAL)to produce desired products is a challenging task due to the complex conjugate system of the two unsaturated functional *** this study,a simple ball milling method is presented for synthesizing Pt-based single-atom alloy catalysts(SAAs)that can function as a control switch for the selective hydrogenation of CAL into highly valuable products.

关键词： alloy hydrogenation conjugate

维普期刊数据库

Advancing insights into in vivo meningeal lymphatic vessels with stereoscopic wide-field photoacoustic microscopy

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Light(Science & Applications) 2024年第5期13卷 894-907页

作者： Fei Yang Zhiyang w.ng w.nbin Shi Miao w.ng Rui Ma wuyu zhang Xipeng Li Erqi w.ng w.njie Xie Zhan zhang Qi Shen Feifan Zhou Sihua Yang MOE Key Laboratory of Laser Life Science&Institute of Laser Life Science South China Normal UniversityGuangzhou 510631China. Guangdong Provincial Key Laboratory of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou 510631China. Key Laboratory of Biomedical Engineering of Hainan Province School of Biomedical EngineeringHainan UniversityHaikou 570100China. Department of neurology Sun Yatsen Memorial HospitalSun Yat-sen UniversityGuangzhou 510120China. Guangdong Province Key Laboratory of Brain Function and Disease Zhongshan School of MedicineSun Yat-sen UniversityGuangzhou 510120China. Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter South China Normal UniversityGuangzhou 510006China

Meningeal lymphatic vessels(mLVs)play a pivotal role in regulating metabolic waste from cerebrospinal fluid(CSF).However,the current limitations in field of view and resolution of existing imaging techniques impede understanding the stereoscopic morphology and dynamic behavior of mLVs in ***,we utilized dual-contrast functional photoacoustic microscopy to achieve wide-field intravital imaging of the lymphatic system,including mLVs and glymphatic *** stereoscopic photoacoustic microscopy based on opto-acoustic confocal features has a depth imaging capability of 3.75 mm,facilitating differentiation between mLVs on the meninges and glymphatic pathways within the brain ***,using this imaging technique,we were able to visualize the dynamic drainage of mLVs and identify a peak drainage period occurring around 20–40 min after injection,along with determining the flow direction from CSF to lymph ***,in the Alzheimer’s disease(AD)mouse model,we observed that AD mice exhibit a~70%reduction in drainage volume of mLVs compared to wild-type *** the development of AD,there is be continued decline in mLVs drainage *** finding clearly demonstrates that the AD mouse model has impaired CSF *** study opens up a horizon for understanding the brain’s drainage mechanism and dissecting mLVs-associated neurological disorders.

关键词： lymphatic impaired field

Temperature-Dependent Tearing Behavior of Rubber Materials:Characterization and Modeling

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Acta Mechanica Solida Sinica 2024年第2期37卷 316-326页

作者： Qinyuan Yao Feilong zhang Pan Dong Ziyuan Zhao Yi He weiguo Li Liming Chen State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing400044China College of Aerospace Engineering Chongqing UniversityChongqing400044China

with the increasingly widespread application of rubber in many fields,there is a grow.ng demand for quantitative characterization of temperature-dependent mechanical properties in high-temperature service *** critical tearing energy is an important criterion for determining whether rubber materials will experience tearing instability,while tear strength is a key parameter for rubber materials to resist *** is necessary to quantitatively characterize their evolution with *** theoretical research mainly relies on fitting a large amount of experimental data,which is not convenient for engineering ***,in this work,a temperature-dependent critical tearing energy model is firstly developed based on the force-heat equivalence energy density *** model considers the equivalent relationship between the critical tearing energy required for crack instability propagation and the thermal energy stored in the rubber *** is demonstrated that our model has higher prediction accuracy when compared to other ***,combining with the Griffith fracture theory,temperature-dependent tear strength models applicable to three different crack modes are separately *** models are validated using experimental data for Mode I opening cracks and ModeⅢtearing cracks,and good consistency is ***,a quantitative analysis of the influence of elastic modulus on tear strength at different temperatures is *** work provides a reliable way for predicting temperature-dependent tearing instability behavior and offers beneficial suggestions for improving the tear strength of rubber materials at different temperatures.

关键词： Temperature-dependent Critical tearing energy Tear strength Rubber Theoretical model

Full-length transcriptome sequencing analysis reveals differential skin color regulation in snakeheads fish Channa argus

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Aquaculture and Fisheries 2024年第4期9卷 590-596页

作者： Leigang Mao Yongan Zhu Jiaren Yan Longgang zhang Shuren Zhu Li An Qinglei Meng Zhishan zhang Xirong w.ng College of Fisheries and Life Science Shanghai Ocean UniversityShanghai201306China Shandong Freshwater Fisheries Research Institute Jinan250017China

Albinism is a genetic disorder caused by a series of genetic abnormalities that result in a decrease in *** yellow snakehead fish(GCAS)has been discovered while the Channa argus(CAS)breeding,but the genetic mechanism that causes its albinism is not *** sequencing and comparison of CAS and GCAS skin using Oxford nanopore Technologies(OnT)technology to elucidate the molecular mechanisms of snakehead albinism.27.1 G clean reads and 26,198 full-length non-redundant sequences were generated via OnT ***,8079 new transcripts and 7231 genes were identified by comparing and analyzing redundant removed transcripts and known reference genome *** results of DEGs analysis showed that a total of 59 transcripts were differentially expressed in the two groups,including 22 up-regulated transcripts and 37 down-regulated *** causative genes associated with albinism have been identified,including TYR(Tyrosinase)and SOX10(SRY-box transcription factor 10)(tyrosinase synthesis and metabolism),S-100(S100 calcium binding protein A1)(melanin production),nLRC3(nLR family CARD domain containing 3)(disease immunity)are significantly down-regulated in GCAS,while RhoGEFs expression(melanin synthesis)is *** interaction analysis revealed that GAPDH(Glyceraldehyde-3-phosphate dehydrogenase)is the top hub gene in the regulation of skin color in *** addition,the skin of snakehead fish is regulated by metabolic(GAPDH),immune[Tumor protein p53(TP53),C-X-C motif chemokine ligand 8(CXCL8),SRC proto-oncogene,non-receptor tyrosine kinase(SRC),CD274]and neural[notch receptor 1(nOTCH1),C-X-C motif chemokine ligand 12(CXCL12)]related genes to achieve differences in skin *** findings in understanding the process by which albinism in fish develops.

关键词： Albinism Channa argus nanopore-based RnA sequencing Melanin

Multi-scenario land use prediction and layout optimization in nanjing Metropolitan Area based on the PLUS model

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Journal of Geographical Sciences 2024年第7期34卷 1415-1436页

作者： CAO Ji CAO weidong CAO Yuhong w.nG Xuewei zhang Yizhen MA Jinji School of Geography and Tourism Anhui Normal UniversityWuhuAnhui241002China School of Ecology and Environment Anhui Normal UniversityWuhuAnhui241002China

The metropolitan area is a crucial spatial element in promoting new urbanization in *** possesses theoretical and empirical value in the determination of the evolutionary patterns and development trends necessary for regional integration and high-quality *** study focused on nanjing Metropolitan Area,the first national metropolitan area in China,and established three development scenarios by combining ecological–economic spatial conflict(EESC)zones and national key ecological functional *** scenarios simulate the spatial distribution of future land use and land cover change(LUCC)using the development zone planning function of the patch generation land use simulation(PLUS)*** results show that:(1)Between 2000 and 2020,the most prominent characteristics of land use change were largely the massive expansion of built-up land and the significant decline of farmland,while changes in the area of ecological land were less evident.(2)EESC areas experienced significant changes over the past 20 years,but the overall level of conflict was *** land was the main land use type in the lowest-conflict area,while built-up land was the main land use type in the highest-conflict area.(3)From 2030 to 2050,further expansion of built-up areas is expected,with continued decrease of *** regulation of these land use changes can be achieved through different development zone *** economic development scenario had the largest built-up land area,while the ecological protection scenario had the largest farmland *** study simulates the spatial pattern changes in the metropolitan area based on spatial conflict patterns and national main functional area planning process,providing a scientific reference for future spatial planning and management.

关键词： land use change spatial conflict patch-generating simulation land use prediction nanjing Metropolitan Area

维普期刊数据库

Characterization and Monitoring of Transient Enamine Radical Intermediates in Photoredox/Chiral Primary Amine Synergistic Catalytic Cycle

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CCS Chemistry 2024年第10期6卷 2420-2426页

作者： Shixue zhang Liang Cheng Jian-Qing Qi Zongbin Jia Long zhang Lei Jiao Xingwei Guo Sanzhong Luo Center of Basic Molecular Science(CBMS) Department of ChemistryTsinghua UniversityBeijing 100084

Enamine-derived radicals are crucial intermediates in singly occupied molecular orbital(SOMO)***,observing them directly is elusive and remains a long-standing ***,an advanced time-resolved electron paramagnetic resonance technique was employed to characterize and monitor the key intermediates in photoredox transformations by primary aminocatalysis on a microsecond *** transient enamine radical cation,generated by single electron transfer(SET),and the deprotonated form ofα-imino radical intermediates were directly observed for the first time,both spectroscopically and *** reactions with styrene,enamine radical cation was found to be faster thanα-imino radical by one order of *** revealed the subtle role of deprotonation associated with secondary enamine radical cation in the photoredox transformations by primary aminocatalysis.

关键词： aminocatalysis radical chemistry electron paramagnetic resonance direct observation time-resolved technique