检索结果-南通市图书馆

Preparation and microstructure of CuO-coO-MnO/SiO2 nanocomposite aerogels and xerogels as catalyst carriers

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2011年第4期21卷 330-335页

作者： Yue-qing ZHao~1,Ying-hua LIANG~2,Xi-zhe ZHao~3,Qian-yi JIA~4,Hong-sheng LI~4 1.college of Light Industry,Hebei United University,Tangshan 063000,china 2.college of Chemical Engineering,Hebei United University,Tangshan 063009,china 3.college of Printing and Packaging Engineering,beijing institute of graphic co.munication,beijing 102600,china 4.college of Materials Science and Engineering,Hebei United University,Tangshan 063009,china college of Light Industry Hebei United University Tangshan 063000 China college of Chemical Engineering Hebei United University Tangshan 063009 China college of Printing and Packaging Engineering Beijing Institute of Graphic Communication Beijing 102600 China college of Materials Science and Engineering Hebei United University Tangshan 063009 China

CuO-coO-MnO/SiO2nanocomposite aerogels and xerogels were prepared using tetraethyl orthosilicate（TEOS） as Si source,and aqueous solution of Cu,co and Mn acetates as the precursor via sol-gel process,co2supercritical drying（SCD） technique or ambient pressure drying *** microstructure of the CuO-coO-MnO/SiO2nanocomposite aerogels and xerogels were characterized by field emission scanning electron microscopy（FE-SEM）,transmission electron microscopy（TEM） and X-ray diffraction（XRD）.The specific surface area,pore size and pore size distribution of the nanocomposite aerogels and xerogels were determined by the Brunauer-Emmett-Teller（BET） *** results showed that CuO-coO-MnO/SiO2nanocomposite aerogels are porous,with a pore size distribution of 2-50 nm,an average pore size of 19.4 nm,a specific surface area of 384.9 m2/g and a particle size distribution of 10-150 nm,whereas the pore size distribution of CuO-coO-MnO/SiO2composite xerogels is 1.7-128.6 nm,the average pore size is only 9.9 nm,the specific surface area is only 99.1 m2/g,and the particle size distribution is 100-500 *** structure of CuO-coO-MnO/SiO2nanocomposite aerogels is favorable to increase the loading of catalysts.

关键词： composite aerogel composite xerogel catalyst carrier preparation microstructure

Dinitrophenyl-oxadiazole compounds:Design strategy,synthesis,and properties of a series of new melt-cast explosives

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第5期35卷 100-107页

作者： Bao-long Kuang Ting-wei Wang cong Li Mou Sun Qamar-un-Nisa Tariq Chao zhang Zhi-ming Xie Zu-jia Lu Jian-guo zhang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China china Wuzhou Engineering Group co. LTD.Beijing 100053China

Melt-cast explosives are the most widely used energetic materials in military composite explosives,researchers have been unremittingly exploring high-energy and insensitive melt-cast *** this work,a series of dinitrophenyl-oxadiazole compounds were designed and *** compounds have an ideal low melting point(80-97℃),good detonation performance(detonation velocity D=6455-6971 m/s,detonation pressure P=18-19 GPa)and extreme insensitive nature(impact sensitivity≥60 J,friction sensitivity>360 N).All these compounds were well characterized by nuclear magnetic resonance,fourier transform infrared spectroscopy,elemental *** 2,3 were unambiguously confirmed by X-ray single crystal diffraction *** a result,their overall properties are superior to traditional melt-cast explosives trinitrotoluene(TNT)and dinitroanisole(DNAN)which may have excellent potential applications in insensitive melt-cast explosives.

关键词： Dinitrophenyl-oxadiazole Melt-cast explosive Low sensitivity

Physiological and transcriptome analyses of Chinese cabbage in response to drought stress

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第7期23卷 2255-2269页

作者： Lin Chen Chao Li Jiahao zhang Zongrui Li Qi Zeng Qingguo Sun Xiaowu Wang Limin Zhao Lugang zhang Baohua Li State Key Laboratory for Crop Stress Resistance and High-Efficiency Production College of HorticultureNorthwest A&F UniversityYangling 712100China institute of Vegetables and Flowers Chinese Academy of Agricultural SciencesBeijing 100081China

Chinese cabbage is an important leafy vegetable crop with high water demand and susceptibility to drought *** explore the molecular mechanisms underlying the response to drought,we performed a transcriptome analysis of drought-tolerant and-sensitive Chinese cabbage genotypes under drought stress,and uncovered core drought-responsive genes and key signaling pathways.A co-expression network was constructed by a weighted gene coexpression network analysis(WGCNA)and candidate hub genes involved in drought tolerance were ***,abscisic acid(ABA)biosynthesis and signaling pathways and their drought responses in Chinese cabbage leaves were systemically *** also found that drought treatment increased the antioxidant enzyme activities and glucosinolate contents *** results substantially enhance our understanding of the molecular mechanisms underlying drought responses in Chinese cabbage.

关键词： Chinese cabbage drought stress abscisic acid weighted gene co-expression network analysis glucosinolate

Recent advances,challenges,and perspectives on carbon capture

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2024年第6期18卷 75-104页

作者： Shihan zhang Yao Shen Chenghang Zheng Qianqian Xu Yifang Sun Min Huang Lu Li Xiongwei Yang Hao Zhou Heliang Ma Zhendong Li Yuanhang zhang Wenqing Liu Xiang Gao institute of Energy and Sustainable Development Zhejiang University of TechnologyHangzhou 310014China college of Environment Zhejiang University of TechnologyHangzhou 310014China Baima Lake Laboratory Hangzhou 310051China institute of Carbon Neutrality College of Energy EngineeringZhejiang UniversityHangzhou 310027China State Key Joint Laboratory of Environmental Simulation and Pollution control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHFIPSChinese Academy of SciencesHefei 230031China

Carbon capture,utilization and storage(CCUS)technologies play an essential role in achieving Net Zero Emissions *** the lack of timely reviews on the recent advancements in promising CCUS technologies,it is crucial to provide a prompt review of the CCUS advances to understand the current research gaps pertained to its industrial *** that end,this review first summarized the developmental history of CCUS technologies and the current large-scale ***,based on a visually bibliometric analysis,the carbon capture remains a hotspot in the CCUS *** that the materials applied in the carbon capture process determines its *** a result,the state-of-the-art carbon capture materials and emerging capture technologies were comprehensively summarized and *** between state-of-art carbon capture process and its ideal counterpart are analyzed,and insights into the research needs such as material design,process optimization,environmental impact,and technical and economic assessments are provided.

关键词： Carbon capture,utilization and storage Visualization analysis Research hotspots and trends co_(2)capture technology

基于倾斜三维模型与机载LiDAR点云的DEM快速更新

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

测绘通报 2024年第S1期 116-119页

作者：徐花芝张洪军张英增肖傲张艳峰刘燕燕山东省国土测绘院山东济南250102 沂南县自然资源和规划局山东临沂276300 北京吉威空间信息股份有限公司北京100041

随着倾斜摄影技术的发展和实景三维建设的不断推进,地形级实景三维地理场景对DEM现势性要求日益提高。为了解决传统方法更新DEM成本高、工作量大的问题,本文提出了利用倾斜三维模型成果转换点云,融合两期DSM和DOM进行变化检测,替换已有... 详细信息

随着倾斜摄影技术的发展和实景三维建设的不断推进,地形级实景三维地理场景对DEM现势性要求日益提高。为了解决传统方法更新DEM成本高、工作量大的问题,本文提出了利用倾斜三维模型成果转换点云,融合两期DSM和DOM进行变化检测,替换已有机载LiDAR点云,快速更新DEM的方法,并通过项目验证了该方法的可行性,极大地节约了生产成本,为DEM更新提供了思路。

关键词：倾斜摄影三维模型密集匹配点云精度高 DEM更新

Response of ocean acidification to atmospheric carbon dioxide removal

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第6期140卷 79-90页

作者： Jiu Jiang Long Cao Xiaoyu Jin Zechen Yu Han zhang Jianjie Fu Guibin Jiang School of Environment Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Key Laboratory of Geoscience Big Data and Deep Resources of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhou 310058China Zhejiang Climate Center Hangzhou 310052China

Artificial co_(2)removal from the atmosphere(also referred to as negative co_(2)emissions)has been proposed as a potential means to counteract anthropogenic climate *** we use an Earth system model to examine the response of ocean acidification to idealized atmospheric co_(2)removal *** our simulations,atmospheric co_(2)is assumed to increase at a rate of 1%per year to four times its pre-industrial value and then decreases to the pre-industrial level at a rate of 0.5%,1%,2%per year,*** results show that the annual mean state of surface ocean carbonate chemistry fields including hydrogen ion concentration([H^(+)]),pH and aragonite saturation state respond quickly to removal of atmospheric co_(2).However,the change of seasonal cycle in carbonate chemistry lags behind the decline in atmospheric co_(2).When co_(2)returns to the pre-industrial level,over some parts of the ocean,relative to the pre-industrial state,the seasonal amplitude of carbonate chemistry fields is substantially *** results also show that changes in deep ocean carbonate chemistry substantially lag behind atmospheric co_(2)*** co_(2)returns to its pre-industrial value,the whole-ocean acidity measured by[H^(+)]is 15%-18%larger than the pre-industrial level,depending on the rate of co_(2)*** study demonstrates that even if atmospheric co_(2)can be lowered in the future as a result of net negative co_(2)emissions,the recovery of some aspects of ocean acidification would take decades to centuries,which would have important implications for the resilience of marine ecosystems.

关键词： Carbon dioxide removal Net negative co_(2)emission Ocean acidification Climate change Earth system modeling

An Improved Thermal conductivity Measurement Scheme for Macroscopic Graphitic Films Using the Laser Flash Method

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第4期33卷 1480-1490页

作者： zhang Peijuan MING Xin LIU Yingjun WANG Xuelong SHI Hang Hao Yuanyuan LU Jiahao LIU Zheng LAI Haiwen zhang Ying Gao Weiwei XU Zhen Gao Chao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceZhejiang UniversityHangzhou310027China Shanxi-Zheda institute of Advanced Materials and Chemical Engineering Taiyuan030032China Special Equipment Safety Supervision and Inspection institute of Jiangsu Province National Graphene Products Quality Inspection and Testing Center(Jiangsu)Wuxi214174China Hangzhou Gaoxi Technol co. LtdHangzhou311113China china Academy of Aerospace Aerodynamics Beijing100074China

Achieving efficient thermal management urges to exploit high-thermal-conductivity materials to satisfy the boosted demand of heat *** is critical to adopt standardized characterization protocols to evaluate the intrinsic thermal conductivity of thermal management ***,for the most representative laser flash method,the lack of standard measurement methodology and systematic description on the thermal diffusivity and influencing factors has led to significant deviations and confusion of the thermal conduction performance in the emerging thermal management ***,the measurement error factors of thermal diffusivity by the common laser flash analyzer(LFA)are *** high-thermal-conductivity graphitic film(GF)as a typical case,the key factors are analyzed to guide the measurement protocol of related carbon-based thermal management *** basic principle of the LFA measurement,actual pre-processing conditions,instrument parameters setting,and data analysis are elaborated for accurate ***,the graphene thick films and common isotropic materials are also extended to meet various thermal measurement *** on the existing practical problems,we propose a feasible test flow to achieve a unified and standardized thermal conductivity measurement,which is beneficial to the rapid development of carbon-based thermal management materials.

关键词： thermal management graphitic film laser flash method thermal conductivity thermal diffusivity

Ammonia storage and slip under steady and transient state in close-coupled SCR

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第4期138卷 470-481页

作者： Shiyu Liu Zhaohuan zhang Zexian Guo Boyuan Wang Buyu Wang Xiao Ma Shijin Shuai State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China institute for Aero Engine Tsinghua UniversityBeijing 100084China

The close-coupled selective catalytic reduction(cc-SCR)catalyst is an effective technology to reduce tailpipe NOx emission during cold *** paper investigated the optimal ammonia storage under steady and transient state in the *** study showed that a trade-off between NOx conversion efficiency and ammonia slip is observed on the pareto solutions under steady state,and the optimal ammonia storage is calculated with ammonia slip less than 10μL/L based on the chinaⅥemission *** rapid temperature increase will lead to severe ammonia slip in the transient test cycle.A simplified 0-D calculation method on ammonia slip under transient state is proposed based on kinetic model of ammonia adsorption and *** addition,the effect of ammonia storage,catalyst temperature and temperature increasing rate on ammonia slip are *** optimal ammonia storage is calculated with maximum ammonia slip less than 100μL/L according to the oxidation efficiency of ammonia slip catalyst(ASC)downstream *** was found that the optimal ammonia storage under transient state is much lower than that under steady state in cc-SCR at lower temperature,and a phase diagram is established to analyze the influence of temperature and temperature increasing rate on optimal ammonia storage.

关键词： Close-coupled SCR Ammonia storage and slip Steady and transient state Generic algorithm

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

在线全文

学校读者我要写书评

暂无评论

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