检索结果-南通市图书馆

In situ embedded bismuth nanoparticles among highly porous carbon fibers for efficient carbon dioxide reduction

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第9期43卷 4312-4320页

作者： wei-Jian Guo Ao Zhou Wen-Wen cai Jin-Tao zhang Key Laboratory for Colloid and Interface Chemistry(Ministry of Education) School of Chemistry and Chemical EngineeringShandong UniversityJinan 250100China

Electrocatalysis provides an optimal approach for the conversion of carbon dioxide(CO_(2))into high-value chemicals,thereby presenting a promising avenue toward achieve carbon ***,addressing the selectivity and stability challenges of metal catalysts in electrolytic reduction remains a daunting *** this study,the electrospinning method is employed to fabricate porous carbon nanofibers loaded with bismuth nanoparticles with the help of in situ *** porous carbon nanofibers as conductive support would facilitate the dispersion of bismuth active sites while inhibiting their aggregation and promoting the mass transfer,thus enhancing their electrocatalytic activity and ***,nitrogen doping induces electron delocalization in bismuth atoms through metal-support interactions,thus enabling efficient adsorption of intermediates for improving selectivity based on the theoretical ***,Bi@PCNF-500 exhibits the exceptional selectivity and stability across a wide range of potential ***,its faradaic efficiency(FE)of formate reaches 92.7%in H-cell and94.9%in flow cell,respectively,with good electrocatalytic *** in situ characterization and theoretical calculations elucidate the plausible reaction mechanism to obtain basic rules for designing efficient electrocatalyst.

关键词： Porous carbon nanofiber N-doping Electron delocalization Carbon dioxide reduction

Crystallization behavior of blast-furnace slag by single hot thermocouple technique

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2020年第3期27卷 259-265页

作者： Tie-lei Tian Shuang cai Yu-zhu zhang Hong-wei Xing College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063009HebeiChina College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

The crystallization behavior of blast-furnace slag under isothermal and continuous-cooling conditions was studied using the single hot thermocouple *** crystallization phases were obtained using FactSage software and X-ray *** crystallization kinetic parameters were calculated by combining these results with the Johnson-Mehl—Avrami *** isothermal conditions,the shortest crystallization incubation time was 24 and 18 s when the temperatures were 1300 and 1150℃,and the corresponding critical cooling rates were 4.5 and 14.3℃/s,*** 1270℃,the slag was difficult to crystallize and the fiber-forming rate *** the continuous-cooling rate was 6.5℃/s,the slag solidified into a glassy *** main crystallization phases,gehlenite,akermanite,anorthite,and melangite,were most easily *** growth factors of melangite and anorthite were approximately 1.63 and 1.68,respectively,which indicated that the crystals nucleated on the surface and grew in two dimensions.

关键词： Blast-furnace slag Cooling rate Crystallization Single hot thermocouple technique

Restructured single parabolic band model for quick analysis in thermoelectricity

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2021年第1期7卷 1053-1060页

作者： Jianbo Zhu Xuemei zhang Muchun Guo Jingyu Li Jinsuo Hu Songting cai wei cai Yongsheng zhang Jiehe Sui National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbinChina Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefeiChina Science Island Branch of Graduate School University of Science and Technology of ChinaHefeiChina Department of Materials Science and Engineering Northwestern UniversityEvanstonILUSA

The single parabolic band(SPB)model has been widely used to preliminarily elucidate inherent transport behaviors of thermoelectric(TE)materials,such as their band structure and electronic thermal conductivity,***,in the SPB calculation,it is necessary to determine some intermediate variables,such as Fermi level or the complex Fermi-Dirac *** this work,we establish a direct carrier-concentration-dependent restructured SPB model,which eliminates Fermi-Dirac integrals and Fermi level calculation and emerges stronger visibility and usability in *** have verified the reliability of such restructured model with 490 groups of experimental data from state-of-the-art TE materials and the relative error is less than 2%.Moreover,carrier effective mass,intrinsic carrier mobility and optimal carrier concentration of these materials are systematically *** believe that our work can provide more convenience and accuracy for thermoelectric data analysis as well as instructive understanding on future optimization design.

关键词： parabolic Fermi instru

Theoretical understanding of correlation between magnetic phase transition and the superconducting dome in high-Tc cuprates

维普期刊数据库评论

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(Physics,Mechanics & Astronomy) 2024年第2期67卷 167-173页

作者： Chen zhang cai-Xin zhang Su-Huai wei Haiqing Lin Hui-Xiong Deng State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Beijing Computational Science Research Center Beijing 100193China

Many issues concerning the origin of high-temperature superconductivity(HTS)are still under *** example,how the magnetic order varies with doping and its relationship with the superconducting temperature(Tc);and why Tcalways peaks near the quantum critical *** this paper,taking hole-doped La_(2)CuO_(4)as a classical example,we employ the first-principles band structure and total energy calculations with Monte Carlo simulations to explore how the symmetry-breaking magnetic ground state evolves with hole doping and the origin of a dome-shaped superconductivity region in the phase *** demonstrate that the local antiferromagnetic order and doping play key roles in determining the electron-phonon coupling,thus ***,the La_(2)CuO_(4)possesses a checkerboard local antiferromagnetic ground *** the hole doping increases,Tcincreases with the enhanced electron-phonon coupling *** as the doping increases further,the strength of the antiferromagnetic interaction weakens and spin fluctuation *** the critical doping level,a magnetic phase transition occurs that reduces the local antiferromagnetism-assisted electron-phonon coupling,thus diminishing the *** superconductivity disappears in the heavily overdoped region when the ferromagnetic order *** observations could account for why cuprates have a dome-shaped superconductivity region in the phase *** study,thus,contributes to a fundamental understanding of the correlation between doping,local magnetic order,and superconductivity of HTS.

关键词： high-temperature superconductivity antiferromagnetic order electron-phonon coupling doping effect cuprates

同方期刊数据库

Histone methylation readers MRG1/MRG2 interact with the transcription factor TCP14 to positively modulate cytokinin sensitivity in Arabidopsis

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2023年第8期50卷 589-599页

作者： Fan Wang Xixi cai Huizhe wei Linghao zhang Aiwu Dong wei Su State Key Laboratory of Genetic Engineering Collaborative Innovation Center for Genetics and DevelopmentDepartment of BiochemistryInstitute of Plant BiologySchool of Life SciencesFudan UniversityShanghai 200438China

Cytokinins influence many aspects of plant growth and *** cytokinin biosynthesis and signaling have been well studied in planta,little is known about the regulatory effects of epigenetic modifications on the cytokinin ***,we reveal that mutations to Morf Related Gene(MRG)proteins MRG1/MRG2,which are readers of trimethylated histone H3 lysine 4 and lysine 36(H3K4me3 and H3K36me3),result in cytokinin hyposensitivity during various developmental processes,including callus induction and root and seedling growth *** to the mrg1 mrg2 mutant,plants with a defective AtTCP14,which belongs to the TEOSINTE BRANCHED,CYCLOIDEA,AND PROLIFERATING CELL FACTOR(TCP)transcription factor family,are insensitive to ***,the transcription of several genes related to cytokinin signaling pathway is ***,the expression of Arabidopsis thaliana HISTIDINE-CONTAINING PHOSPHOTRANSMITTER PROTEIN 2(AHP2)decreases significantly in the mrg1 mrg2 and tcp14-2 *** also confirm the interaction between MRG2 and TCP14 in vitro and in ***,MRG2 and TCP14 can be recruited to AHP2 after recognizing H3K4me3/H3K36me3 markers and promote the histone-4 lysine-5 acetylation to further enhance AHP2 *** summary,our research elucidate a previously unknown mechanism mediating the effects of MRG proteins on the magnitude of the cytokinin response.

关键词： Arabidopsis Cytokinin response Histone methylation reader TCP transcription factors Transcription regulation

Drying and preheating processes of iron ore pellets in a traveling grate

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2010年第5期17卷 535-540页

作者： Jun-xiao Feng Yu zhang Hai-wei Zheng Xiao-yan Xie cai zhang School of Mechanical Engineering University of Science and Technology B~ijing Beijing 100083 China

A mathematical model of drying and preheating processes in a traveling grate was presented based on the laws of mass, momen- tum, heat transfer, and drying semiempirical relations. A field test was systematically carried out in a traveling grate. The effects of pellet diameter, moisture, grate velocity, and inlet gas temperature on the pellet bed temperature were studied. The average relative error between actual measurements and simulations is less than 7.97%, indicating the validity of the model.

关键词： iron ores pelletizing drying preheating numerical methods field test

Quantitative proteomics reveals key pathways in the symbiotic interface and the likely extracellular property of soybean symbiosome

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2023年第1期50卷 7-19页

作者： Yu Luo wei Liu Juan Sun Zheng-Rong zhang wei-cai Yang The State Key Laboratory for Molecular Developmental Biology Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China College of Advanced Agricultural Sciences University of Chinese Academy of SciencesBeijing 100049China

An effective symbiosis between legumes and rhizobia relies largely on diverse proteins at the plantrhizobium interface for material transportation and signal transduction during symbiotic nitrogen ***,we report a comprehensive proteome atlas of the soybean symbiosome membrane(SM),peribacteroid space(PBS),and root microsomal fraction(RMF)using state-of-the-art label-free quantitative proteomic *** total,1759 soybean proteins with diverse functions are detected in the SM,and 1476 soybean proteins and 369 rhizobial proteins are detected in the *** diversity of SM proteins detected suggests multiple origins of the *** comparative analysis highlights amino acid metabolism and nutrient uptake in the SM,indicative of the key pathways in nitrogen *** detection of soybean secretory proteins in the PBS and receptor-like kinases in the SM provides evidence for the likely extracellular property of the symbiosome and the potential signaling communication between both symbionts at the symbiotic *** proteomic data provide clues for how some of the sophisticated regulation between soybean and rhizobium at the symbiotic interface is achieved,and suggest approaches for symbiosis engineering.

关键词： Quantitative proteomics Symbiotic nitrogen fixation Symbiosome membrane Peribacteroid space Soybean

Analysis of sensitivity to hydrate blockage risk in natural gas gathering pipeline

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第4期21卷 2723-2733页

作者： Ao-Yang zhang Meng cai Na wei Hai-Tao Li Chao zhang Jun Pei Xin-wei Wang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Research Institute of Production Engineering Daqing Oilfield Co.Ltd.Daqing163453HeilongjiangChina

During the operational process of natural gas gathering and transmission pipelines,the formation of hydrates is highly probable,leading to uncontrolled movement and aggregation of *** continuous migration and accumulation of hydrates further contribute to the obstruction of natural gas pipelines,resulting in production reduction,shutdowns,and pressure ***,a cascade of risks is prone to *** address this issue,this study focuses on the operational process of natural gas gathering and transmission pipelines,where a comprehensive framework is *** framework includes theoretical models for pipeline temperature distribution,pipeline pressure distribution,multiphase flow within the pipeline,hydrate blockage,and numerical solution *** analyzing the influence of inlet temperature,inlet pressure,and terminal pressure on hydrate formation within the pipeline,the sensitivity patterns of hydrate blockage risks are *** research indicates that reducing inlet pressure and terminal pressure could lead to a decreased maximum hydrate formation rate,potentially mitigating pipeline blockage during natural gas ***,an increase in inlet temperature and terminal pressure,and a decrease in inlet pressure,results in a displacement of the most probable location for hydrate blockage towards the terminal ***,it is crucial to note that operating under low-pressure conditions significantly elevates energy consumption within the gathering system,contradicting the operational goal of energy efficiency and reduction of energy ***,for high-pressure gathering pipelines,measures such as raising the inlet temperature or employing inhibitors,electrical heat tracing,and thermal insulation should be adopted to prevent hydrate formation during natural gas ***,considering abnormal conditions such as gas well production and pipeline network shutdowns,which could potentially tr

关键词： Natural gas hydrates Gathering pipeline Temperature variation Hydrate formation rate Sensitivity analysis

Accuracy analysis of a single-fault Markov model for FADEC system

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2019年第5期30卷 1044-1052页

作者： cai Jing HU wei cai Kunye College of Civil Aviation Nanjing University of Aeronautics and Astronautics

Time-limited dispatching(TLD)analysis of the full authority digital engine control(FADEC)systems is an important part of the aircraft system safety analysis and a necessary task for the certification of commercial aircraft and *** the time limited dispatch guidance document ARP5107B,a single-fault Markov model(MM)approach is proposed for TLD ***,ARP5107B also requires that the loss of thrust control(LOTC)rate error calculated by applying the single-fault MM must be less than 5%when performing airworthiness ***,the sources of accuracy errors in three kinds of MM are analyzed and specified through a case study of the general FADEC system,and secondly a two-fault MM considering maintenance policy is established through analyzing and calculating the expected repair time when two related faults ***,a specific FADEC system is given to study on the influence factors of accuracy error in the single-fault MM,and the results show that the accuracy error of the single-fault MM decreases with the increase of short or long prescribed dispatch time,and the range values of short time(ST)and long time(LT)are determined to satisfy the requirement of accuracy error within 5%.

关键词： full authority digital engine control(FADEC)system Markov model(MM) accuracy analysis loss of thrust control(LOTC)