检索结果-南通市图书馆

Recent advances in electrocatalytic conversion of nitrates into high-value products

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

Journal of Energy Chemistry 2024年第12期99卷 50-65页

作者： Yuhao Qian Jiabao Lv Xuting Liu Zhifu Qi Angjian Wu State Key laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 30027ZhejiangChina baima lake laboratory.Hangzhou 310053 ZhejiangChina

The electrocatalytic nitrate reduction reaction (NO_(3)RR) powered by renewable energy offers a promising approach for simultaneously reutilization of nitrate and synthesizing high-value ***,theoretical understanding of reaction mechanism was relative illusive,which is indispensable to rationally design of efficient ***,tuning the reaction microenvironment along with the scale-up device development is essential to promote the industrial deployment of electrocatalytic nitrate conversion,while relative research was *** this regard,recent advances in ammonia synthesis are firstly summarized,including the identification of active sites,exploration of the underlying reaction mechanisms,electrolyzer design and technical-economic ***,electrocatalytic C–N coupling based on NO_(3)RR to produce higher-value products such as urea and amino acids are also reviewed,to extend the application potential and economic ***,we highlight the existing challenges and the demand of future research for NO_(3)*** review anticipates to provide insights into synthesis of high-value products via NO_(3)RR,bridging the gap from laboratory research to industrial fabrication.

关键词： Nitrate reduction reaction Electrocatalysis Ammonia synthesis C–N coupling

Accelerating net-zero carbon emissions by electrochemical reduction of carbon dioxide

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第4期79卷 398-409页

作者： Fan He Sirui Tong Zhouyang Luo Haoran Ding Ziye Cheng Chenxi Li Zhifu Qi Zhejiang baima lake laboratory Co. LtdHangzhou 311121ZhejiangChina School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore

Electroreduction of CO_(2)shows great potential for global CO_(2)utilization and uptake when collaborated with renewable *** advances have been achieved in fundamental understanding and electrocatalyst development for CO_(2)*** think this research area has progressed to the stage where significant efforts can focus on translating the obtained knowledge to the development of largescale electrolyzers,which have the potential to accelerate the transition of the current energy system into a sustainable and zero-carbon emission energy *** this perspective paper,we first critically evaluate the advancement of vapor-feed devices that use CO_(2)as reactants,from the point of view of industry ***,by carefully comparing their performance to the state-of-the-art water electrolyzers which are well-established technology providing realistic performance targets,we looped back and discussed the remaining challenges including electrode catalysts,reaction conditions,mass transporting,membrane,device durability,operation mode,and so ***,we provide perspectives on the challenges and suggest opportunities for generating fundamental knowledge and achieving technological progress toward the development of practical CO_(2)electrolyzers for the goal of building lowcarbon or/and net carbon-free economies.

关键词： CO_(2)emission Energy storage CO_(2)electroreduction CO_(2)electrolyzer Scale up

Experiment and Analysis of Compatibility between New Phase Change Mixed Molten Salt and 316L Stainless Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第6期33卷 2259-2273页

作者： REN Chenxing ZHENG Chenghang GAO Xiang State Key laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China Institute of Carbon Neutrality Zhejiang UniversityHangzhou 310027China baima lake laboratory Zhejiang UniversityHangzhou 310051China

Molten salt is considered as a promising heat storage and heat transfer medium due to its efficient thermophysical *** order to study the compatibility of five new mixed molten salts obtained with KNO_(3),NaNO_(3),K,CO_(3),Ca(NO_(3))_(2)·4H_(2)O,ZnCl_(2),NaF,Na_(2)CO_(3),NaCl and MgO as materials and 316L stainless steel,corrosion weight loss,scanning electron microscopy,elemental analysis and XRD were used to analyze the compatibility of 316L stainless steel in the new mixed molten salt at different time and *** corrosion behavior under the conditions was studied and *** compatibility data was obtained,and the corrosion mechanism of 316L stainless steel in mixed molten salts was *** results show that the corrosion weight of 316L stainless steel increases,and the corrosion degree of grain,crystal crack depth and oxidation degree increase gradually with the increase of temperature and *** corrosion of molten salt on alloy is mainly caused by the selective diffusion loss and corrosion of Cr,Fe and other elements,and is accompanied by the formation of different metal *** formation of metal oxides can slow down metal corrosion and loss to a certain *** corrosion results under different working conditions show that 316L stainless steel has good compatibility with the new mixed molten salt,and has certain application value in the field of heat transfer and energy storage.

关键词： molten salt 316L stainless steel corrosion resistance heat treatment

Application of Ag-Cu-Ti active metal composite filler in ceramic joining:a review

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2023年第4期17卷 1-35页

作者： Yuhang Li Jun WANG Ziyan SHEN Hangli Qian Wanliang Zhang Kaiyu Zhang Danqing Ying Qihang Zhou Chengshuang Zhou Lin Zhang Institute of Material Forming and Control Engineering Zhejiang University of TechnologyHangzhou 310014China Zhejiang baima lake laboratory Co. Ltd.Hangzhou 310000China

As a structural and functional material with excellent properties,ceramics play an extremely important role in a wide range of industries,including life and *** expand the range of applications for ceramic materials,ceramics are often joined to metals and then *** the physical and chemical joining methods of ceramics to metals,the AMB method is efficient and simple,suitable for industrial applications,and has been a hot topic of ***,due to the problems of residual stresses caused by the large difference in thermal expansion coefficients between ceramic and metal brazing,composite fillers have become a very worthwhile solution by regulating the physical properties of the brazing material and improving the weld *** review describes the wetting principle and application of Ag‒Cu‒Ti active metal filler in the field of ceramic joining,with emphasis on the current stage of composite filler,and discusses the influence on the former brazing properties and organization after the introduction of dissimilar materials.

关键词： brazing composite filler residual stress active metal ceramic‒metal joints

Near-perfect replication on amorphous alloys through active force modulation based on machine learning/neural network parameter prediction

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 181-191页

作者： Senkuan Meng Zheng Wang Ruisong Zhu Ruijie Liu Jiang Ma Lina Hu Weihua Wang Key laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) School of Materials Science and Engineering Shandong University College of Mechatronics and Control Engineering Shenzhen University Songshan lake Materials laboratory Institute of Physics Chinese Academy of Sciences

As a microforming technique, micro/nano-structural replication possesses advantages of high precision and efficiency. With the remarkable superplasticity in the supercooled liquid region, amorphous alloys or metallic glasses(MGs) are regarded as ideal materials for miniature fabrication. However, due to the intrinsic metastable nature of supercooled liquids, the design of imprinting processes for MGs poses a challenge. In the past, process parameters have largely relied on trial-and-error *** this work, a low-frequency active force modulation system is employed to apply a stable, precise, and real-time feedback stress field for imprinting of MG samples. Low-frequency vibrations can facilitate the filling of microstructures on the template surface by reducing the effective viscosity of the supercooled liquid. With the dataset composed of orthogonal experiments, a machine learning strategy based on back-propagation(BP) neural networks was utilized to construct a 3D parameter space for temperature, stress, and time, and to predict the corresponding filling ratio. Furthermore, the optimal combination of imprinting process parameters was identified, and its filling ratio was experimentally validated to reach as high as 0.94. The near-perfect replication of microstructures confirms the superiority of the active force modulation system and the data-driven strategy of machine learning-assisted parameter design. At the same time, this one-step microforming process provides a new approach to addressing the accuracy-cost trade-off dilemma in precision manufacturing.

关键词：

Seasonal and spatial distributions of euphotic zone and longterm variations in water transparency in a clear oligotrophic lake Fuxian, China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2018年第10期30卷 185-197页

作者： Qichao Zhou Yunlin Zhang Kaidi Li Licheng Huang Fengle Yang Yuanyang Zhou Junjun Chang Taihu laboratory for lake Ecosystem Research State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Yunnan Key laboratory of Pollution Process and Management of Plateau lake-Watershed Yunnan Institute of Environmental Science(Kunming China International Research Center for Plateau Lake) School of Ecology and Environmental Science Yunnan University

To assess the seasonal and spatial variations and long-term trends in water optical properties in lake Fuxian, investigations based on field work in four seasons and a long-term analysis of data from 1980 to 2014 were conducted. The results show that there was no significant variation in the euphotic depth（Z（eu）） across the four seasons, and no significant correlations between Z（eu） and potential influencing factors in seasons other than summer, suggesting that the water itself may be a major factor regulating the Z（eu）in general. Nevertheless, significant differences in Z（eu） between the north region（NR） and the south region（SR） were observed in all seasonal tests except spring. This finding relates to a higher abundance of chromophoric dissolved organic matter（CDOM） in the NR due to runoff, especially in the rainy seasons（summer and autumn）.CDOM and its terrigenous component had an important impact on Z（eu）in summer, with the highest precipitation, and impacts from suspended solids and non-algal particles were also found in the NR in summer. The Secchi disk depth in the lake decreased clearly over the years,with significantly negative correlations with the increasing permanganate index and air temperature, implying that organic contaminants（CDOM and/or phytoplankton） are important regulators of water transparency. We estimate that the combined effects of climate warming and changes in land use and land cover are also indirect regulating factors. These findings should be considered in the protection of lake Fuxian, owing to the importance of light penetration in aquatic ecosystems.

关键词： Photosynthetic active radiation Diffuse attenuation coefficient Euphotic depth Secchi disk depth Chromophoric dissolved organic matter Yunnan-Guizhou Plateau

Anelasticity to plasticity transition in a model two-dimensional amorphous solid

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第1期33卷 143-147页

作者：尚宝双 Songshan lake Materials laboratory Dongguan 523808China

Anelasticity, as an intrinsic property of amorphous solids, plays a significant role in understanding their relaxation and deformation mechanism. However, due to the lack of long-range order in amorphous solids, the structural origin of anelasticity and its distinction from plasticity remain elusive. In this work, using frozen matrix method, we study the transition from anelasticity to plasticity in a two-dimensional model glass. Three distinct mechanical behaviors, namely,elasticity, anelasticity, and plasticity, are identified with control parameters in the amorphous solid. Through the study of finite size effects on these mechanical behaviors, it is revealed that anelasticity can be distinguished from *** serves as an intrinsic bridge connecting the elasticity and plasticity of amorphous solids. Additionally, it is observed that anelastic events are localized, while plastic events are subextensive. The transition from anelasticity to plasticity is found to resemble the entanglement of long-range interactions between element excitations. This study sheds light on the fundamental nature of anelasticity as a key property of element excitations in amorphous solids.

关键词： amorphous solid deformation mechanism anelasticity to plasticity transition molecular dynamics simulation

Study on the nutrient evolution and its controlling factors of Longgan lake for the last 200 years

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2006年第z1期49卷 193-202页

作者： LIU Jian YANG Xiangdong WANG Sumin Key laboratory of lake Sedimentation and Environment Chinese Academy of Sciences Nanjing 210008 China Key Laboratory of Lake Sedimentation and Environment Chinese Academy of Sciences Nanjing 210008 China Key Laboratory of Lake Sedimentation and Environment Chinese Academy of Sciences Nanjing 210008 China

Based on the total phosphorous (TP) concentration in sediment core, the TP concentration in lake water quantitatively reconstructed from fossil diatoms and diatom-TP transfer function in the Longgan lake during the last 200 years, the temperature and precipitation data from meteorological observation for the last 50 years, the temperatures and precipitation sequences of climate simulation for the last 200 years, as well as the amount of the agricultural phosphate fertilizer in Longgan area for nearly 50 years, the characteristic and the law of the nutrient status evolution were analyzed, and the influence of the climatic factor, the anthropologic factor and the aquatic biology factor on the nutrient status evolution and its mechanism were discussed for the Longgan lake during the last 200 years. The results showed that, in the nearly 200 years, the TP concentration in the sediment core of the Longgan lake gradually increased, its range of variation was situated between 330-580 mg/kg, the mean value was 388 mg/kg, a nearly 30-year vibration adjustment period existed at 1950 around. The TP concentration in lake water changed in a different way. Before 1950, it had a slow increasing tendency in fluctuated background, to 1950 around it reached up to the mean value (52.18 μg/L), and vibrated and adjusted around the mean value, then it fast declined, its change range was situated between 37.75-62.33 μg/L. The analyses indicated that, in the centennial time scale, the climate change was the main controlling factor, while in the decadal time scale in the recent 50 years, human activities were the leading factors for the nutrient status evolution of the Longgan lake. 60% of the variability of the TP concentration in the sediments and 57% of that in lake water were due to human activities. The differentiation between phosphorus concentration in the sediment and in the lake water reflected the response processes and the adjustment abilities of the lake aquatic ecosystems to th

关键词： Longgan lake, nutrient evolution, controlling factor, climate, human activities.

Molecular catalysts for electrocatalytic ammonia oxidation

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第12期67卷 3976-3993页

作者： Jun Li Feiyang Zhang Huatian Xiong Yuanyuan Cai Biaobiao Zhang Center of Artificial Photosynthesis for Solar Fuels and Department of Chemistry School of Science and Research Center for Industries of the FutureWestlake UniversityHangzhou 310030China Institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310024China Division of Solar Energy Conversion and Catalysis at Westlake University Zhejiang Baima Lake Laboratory Co.Ltd.Hangzhou 310000China

Electrocatalytic ammonia oxidation reaction(eAOR)is of significance to ammonia fuel economy and the production of valuable N-containing products,such as nitrite,nitrate and *** study of well-defined molecular catalysts offers rich insights in terms of the detailed mechanism of ammonia *** review analyzes the thermodynamics of ammonia oxidation reactions and summarizes the current progress in molecular electrocatalysts in this booming *** emphasized the factors that influence the selectivity of products and further discussed the challenges in designing efficient catalysts.

关键词： electrocatalytic ammonia oxidation reaction hydrazine nitrate molecular catalyst