检索结果-南通市图书馆

Palladium installed copper-organic framework for C–C coupling reactions

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 Chemistry 2025年

作者： Yu-Mei Wang Mei-xia Tao Kai-Ming Mo Xu Chen Shu-hua Zhong Elena S Shubina Guo-Hong Ning Dan Li College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Supramolecular Coordination ChemistryJinan University A.N.Nesmeyanov Institute of Organoelement Compounds Russian Academy of Sciences

The formation of C–C bonds is a crucial aspect of organic synthesis. Synthesists' long-term objective is to identify novel catalysts to optimize reaction systems based on traditional transition metal catalysis. This study explores the synthesis and catalytic potential of palladium-installed covalent metal-organic frameworks(CMOFs) based on copper cyclic trinuclear units(Cu-CTUs). By incorporating palladium ions into the imine-based framework JNM-7 through a straightforward immersion method, we achieved a notable enhancement in catalytic activity for critical C–C coupling reactions, including C–H arylation and Sonogashira cross-coupling. The resulting JNM-7-Pd demonstrated remarkable stability and recyclability, maintaining its efficiency over at least three cycles without any decline in efficiency.

关键词：

Simultaneous CO2 capture and H2 generation using Fe2O3/Al2O3 and Fe2O3/CuO/Al2O3 as oxygen carriers in single packed bed reactor via chemical looping process

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2015年第6期9卷 1117-1129页

作者： Jie ZHU Wei WANG Xiuning hua zhou xia zhou DENG School of Environment Tsinghua University Beijing 100084 China Jian Kun New Energy Technology Co. Ltd. Beijing 100085 China

The chemical looping concept provided a novel way to achieve carbon separation during the production of energy or substances. In this work, hydrogen generation with inherent CO2 capture in single packed bed reactor via this concept was discussed. Two oxygen carriers, Fe203 60 wt.% and Fe2O3 55 wt.%/CuO 5 wt.% supported by Al2O3, were made by ball milling method. First, according to the characteristics of the reduction breakthrough curve, a strict fuel supply strategy was selected to achieve simultaneous CO2 capture and HE production. Then, in the long term tests using CO as fuel, it was proved that CuO addition improved hydrogen generation with the maximum intensity of 3700 μmol H2·g^-1 Fe2O3 compared with Fe-Al of 2300 μmol HE.g^-1 Fe2O3. The overall CO2 capture efficiency remained 98%- 98.8% over 100 cycles. Moreover, the reactivity of deactivated materials was recovered nearly like that of fresh ones by sintering treatment. Finally, two kinds of complex gases consist of CO, HE, CH4 and CO2 were utilized as fuels to test the feasibility. The results showed all components could be completely converted by Fe-Cu- Al in the reduction stage. The intensity of hydrogen production and the overall CO2 capture efficiency were in the range of 2000-2400 μnol H2^g^-1 Fe2O3 and 89%, 95%, respectively.

关键词： CO2 capture chemical looping hydrogengeneration iron based oxygen carriers single packed bedreactor long-term test complex gases fuel

Response of indigenous Cd-tolerant electrochemically active bacteria in MECs toward exotic Cr（VI） based on the sensing of fluorescence probes

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2018年第4期12卷 63-75页

作者： xia Hou Liping huang Peng zhou hua Xue Ning Li Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 China College of Chemistry Dalian University of Technology Dalian 116024 China School of Life Science and Biotechnology Dalian University of Technology Dalian 116024 China

Electrochemically active bacteria （EAB） on the cathodes of microbial electrolysis cells （MECs） can remove metals from the catholyte, but the response of these indigenous EAB toward exotic metals has not been examined, particularly from the perspective of the co-presence of Cd（II） and Cr（VI） in a wastewater. Four known indigenous Cd-tolerant EAB of Ochrobactrum sp X l, Pseudomonas sp X3, Pseudomonas delhiensis X5, and Ochrobactrum anthropi X7 removed more Cd（II） and less Cr（VI） in the simultaneous presence of Cd（II） and Cr（VI）, compared to the controls with individual Cd（II） or single Cr（VI）. Response of these EAB toward exotic Cr（VI） was related to the associated subcellular metal distribution based on the sensing of fluorescence probes. EAB cell membrane harbored more cadmium than chromium and cytoplasm located more chromium than cadmium, among which the imaging ofintracelluler Cr（III） ions increased over time, contrary to the decreased trend for Cd（II） ions. Compared to the controls with single Cd（II）, exotic Cr（VI） decreased the imaging of Cd（II） ions in the EAB at an initial 2 h and negligibly affected therealier. However, Cd（II） diminished the imaging of Cr （III） ions in the EAB over time, compared to the controls with individual Cr（VI）. Current accelerated the harboring of cadmium at an initial 2 h and directed the accumulation of chromium in EAB over time. This study provides a viable approach for simultaneously quantitatively imaging Cd（II） and Cr （III） ions in EAB and thus gives valuable insights into the response of indigenous Cd-tolerant EAB toward exotic Cr（VI） in MECs.

关键词： Microbial electrolysis cell Electrochemically active bacteria Cd-tolerant bacteria Cd(ll) and Cr(V1) Fluorescence probe

The Characterization of Graphs with No 2-connected Spanning Subgraph of V_(8)as a Minor

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

Acta Mathematicae Applicatae Sinica 2022年第4期38卷 902-915页

作者： xiao-min zhou xia-xia GUAN Cheng-fu QIN Wei-hua YANG Department of Mathematics Taiyuan University of TechnologyTaiyuan 030000China School of Mathematical Sciences Xiamen UniversityXiamen 361005China School of Mathematics Science Guangxi Teachers Education UniversityNanning 530001China

It is difficult to characterize graphs which contain no a 2-connected graph as a minor in graph *** V_(8)be a graph constructed from an 8-cycle by connecting the antipodal *** are thirteen 2-connected spanning subgraphs of V_(8).In particular,one of them is obtained from the Petersen graph by deleting two vertices and it is also a hard problem to characterize Petersen-minor-free *** this paper,we characterize internally 4-connected graphs which contain a 2-connected spanning subgraph of V_(8)as a forbidden minor.

关键词： V_(8) internally 4-connected graph minor-free 2-connected subgraph

Essential Norms of Weighted Composition Operators from Weighted Bergman Space to Mixed-norm Space on the Unit Ball

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2013年第3期29卷 547-556页

作者： Ze hua zhou Yu xia LIANG Hong Gang ZENG Department of Mathematics Tianjin University

In this paper, we characterize the boundedness and compactness of the weighted composi- tion operators from the weighted Bergman space to the standard mixed-norm space or the mixed-norm space with normal weight on the... 详细信息

关键词： Weighted composition operator weighted Bergman space mixed-norm space essentialnorm compact

Three-Dimensional Wave-Induced Current Model Equations and Radiation Stresses

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2017年第4期31卷 418-427页

作者： xia.hua-yong South China Sea Marine Forecast Center State Oceanic administrationGuangzhou 510300China

After the approach by Mellor （2003, 2008）, the present paper reports on a repeated effort to derive the equations for three-dimensional wave-induced current. Via the vertical momentum equation and a proper coordinate transformation, the phase-averaged wave dynamic pressure is well treated, and a continuous and depth-dependent radiation stress tensor, rather than the controversial delta Dirac function at the surface shown in Mellor （2008）, is provided. Besides, a phase-averaged vertical momentum flux over a sloping bottom is introduced. All the inconsistencies in Mellor （2003, 2008）, pointed out by Ardhuin et al. （2008） and Bennis and Ardhuin （2011）, are overcome in the presently revised equations. In a test case with a sloping sea bed, as shown in Ardhuin et al. （2008）, the wave-driving forces derived in the present equations are in good balance, and no spurious vertical circulation occurs outside the surf zone, indicating that Airy’s wave theory and the approach of Mellor （2003, 2008） are applicable for the derivation of the wave-induced current model.

关键词： sea surface wave wave-induced current radiation stress vertical wave momentum flux

Research on the Design Method of Equipment in Service Assessment Subjects

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第11期73卷 2473-2484页

作者： Jianhua Luo Yuhang zhou hua Li Xi Chen Xigong xia Military Exercise and Training Center Army Academy of Armored ForcesBeijing100072China

Combined with equipment activities such as combat readiness,training, exercises and management, it is proposed that the design of equipment in-service assessment subjects should follow the principles of combination, stage and operability. Focusing on the design of equipment in-serviceassessment subjects, a design method for in-service assessment subjects basedon the combination of trial and training mode is proposed. Based on theactual use of high-equipment use management and training and the established indicator system, the army’s bottom-level equipment activity subjectsand bottom-level assessments are combined. The indicators are mapped andanalyzed. Through multiple rounds of iterations, the mapping relationshipbetween in-service assessment indicators and military equipment activitysubjects is established. Finally, the equipment activity subjects whose data iscollected (reflecting the underlying assessment indicators) are generated inservice assessment subjects. The orthogonal test method is used to optimizethe samples in the assessment subjects to form an in-service assessmentimplementation plan. Taking a certain type of armored infantry fightingvehicle as an example, the sample optimization design of the initially generatedin-service assessment subjects is analyzed. It provides methods and ideas tocarry out in-service assessment work.

关键词： Equipment in-service assessment subject design mapping

Marked ion current rectification in microchannels

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 Chemistry 2017年第6期60卷 685-686页

作者： Xing-hua xia State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China

Ion current rectification(ICR)is a physical phenomenon caused by asymmetric transport of anions and cations across an ion nanopore/channel,in which the ion current at a voltage of one polarity is much higher or lower than the one of opposite voltage *** ICR was first observed in a nanopipette in 1997,extensive research has been performed using various nanopores/nanochannels,revealing the applicability of ICR in various fields including fluidic logic circuits(i.e.,iontronics),energy conversion and storage,

关键词： polarity asymmetric opposite electrolyte length revealing circuits explain radius Figure

Quantitative Evaluation of Sustainable Development and Eco-Environmental Carrying Capacity in Water-Deficient Regions:A Case Study in the Haihe River Basin,China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2014年第1期13卷 195-206页

作者： WANG Zhong-gen LUO Yu-zhou ZHANG Ming-hua xia Jun Key Laboratory of Water Cycle & Related Land Surface Processes/Institute of Geographical Science and Natural Resources Research Chinese Academy of Sciences Department of Land Air and Water ResourcesUniversity of California

Quantitative assessment of development sustainability could be a challenge to regional management and planning, especially for areas facing great risks of water shortage. Surface-water decline and groundwater over-pumping have caused serious environmental problems and limited economic development in many regions all around the world. In this paper, a framework for quantitatively evaluating development sustainability was established with water-related eco-environmental carrying capacity （EECC） as the core measure. As a case study, the developed approach was applied to data of the Haihe River Basin, China, during 1998 through 2007. The overall sustainable development degree （SDD） is determined to be 0.39, suggesting that this rate of development is not sustainable. Results of scenario analysis revealed that overshoot, or resource over- exploitation, of the Basin＇s EECC is about 20% for both population and economy. Based on conditions in the study area in 2007, in order to achieve sustainable development, i.e., SDD〉0.70 in this study, the EECC could support a population of 108 million and gross domestic product （GDP） of 2.72 trillion CNY. The newly developed approach in quantifying ecoenvironmental carrying capacity is anticipated to facilitate sustainable development oriented resource management in waterdeficient areas.

关键词： eco-environmental carrying capacity development scenario Haihe River Basin sustainable development waterresources