检索结果-南通市图书馆

Chinese Journal of Structural Chemistry 2023年第6期42卷 22-26页

作者： yong-peng li Jing-Jing Ni Shu-Cong Fan Quan-Guo Zhai School of Chemistry and Chemical Engineering Institute of Applied CatalysisYantai UniversityYantaiShandong 264005China Key Laboratory of Macromolecular Science of Shaanxi Province School of Chemistry&Chemical Engineering Shaanxi Normal UniversityXi'an710062China

The development of metal-organic frameworks(MOFs)with highly efficient adsorption and separation of acet-ylene is very important and challenging in chemical industry due to the explosive nature of *** MOFs can be constructed by inserting a second auxiliary ligand,which allows the use of large ligands to construct non-interpenetrated structures and increase pore ***,SNNU-205 is successfully synthesized,which connects two sets of interpenetrated structures to form a double walled cage-within-cage structure by using the introduction of a second auxiliary *** modified pore environment enables SNNU-205 to efficiently selectively adsorb C_(2)H_(2)over CO_(2).At 298 K and 1 atm,SNNU-205 can uptake much more C_(2)H_(2)(76.3 cm^(3)g1)than CO_(2)(47.3 cm^(3)g^(-1)),resulting in a high substance ratio of C_(2)H_(2)-to-CO_(2)(1.6).More importantly,the ideal adsorbed solution theory selectivity calculations and column breakthrough tests further indicate SNNU-205 to be promising adsorbents for C_(2)H_(2)adsorption and purification.

关键词： Metal-organic frameworks(MOFs) Second auxiliary ligand Acetylene storage Acetylene/carbon dioxide separation

Metal complexes of bipyridine-functionalized covalent organic frameworks as efficient electrocatalysts for oxygen evolution reaction

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

Rare Metals 2024年第7期43卷 3096-3106页

作者： Zhuang-Zhuang Wu Tian Xia Ying liang yong-peng li Zhu-Yin Sui li-Juan Feng Dao-Xiong Wu Xin-Long Tian Qi Chen State Key Laboratory of Marine Resource Utilization in South China Sea School of Marine Science and EngineeringHainan UniversityHaikou 570228China School of Chemistry and Chemical Engineering Yantai UniversityZhuhai519041China School of Bioengineering Zhuhai Campus of Zunyi Medical UniversityZhuhai519041China

Electrocatalytic water splitting is considered a clean and practic al method for producing *** this study,COF-Bpy,a bipyridine-functionalized covalent organic framework(COF),was prepared via post-synthetic modification,after which electrocatalysts for the oxygen evolution reactions(OER)were formed through coordination to single-or double-transition metals(Fe,Co,Ni,FeCo,FeNi or CoNi).COF-Bpy@FeNi delivered the best OER performance among the studied electrocatalysts,with an overpotential of 399 mV at 10 mA·cm^(-2)in an alkaline electrolyte(1.0 mol·L^(-1)KOH aqueous).Notably,the electrocatalytic performance of COF-Bpy@FeNi showed slight degradation during durability testing,which is ascribable to its irreversible benzoquinoline structure and strong metal *** expected,COF-Bpy@FeNi exhibited a low overpotential of 347 mV at a turnover frequency(TOF)of 0.1 s^(-1),which suggests that COF-Bpy@FeNi possesses excellent intrinsic electroc atalytic OER ***,density functional theory(DFT)calculations reveal that the Ni site plays a major role,while the Fe site adjusts the electronic structure of the Ni ions,which rationalizes the excellent OER properties of COF-Bpy@*** study not only provides a simple and efficient method for complexing COFs with transition metals,but also offers a novel strategy for designing porous organic polymer electrocatalysts.

关键词： Covalent organic framework Oxygen evolution reactions(OER)electrocatalyst Nickel-iron synergy Water splitting

维普期刊数据库

Research on the Application of Flash Animation Technology in Digital Media

在线全文

学校读者我要写书评

暂无评论

International Journal of Technology Management 2014年第5期 115-117页

作者： yong Zhang peng li Tangshan Vocational & Technical College Tangshan Hebei 063000 China

This article first respectively introduces the characteristics of product design and digital media technology, combined with knowledge of the new economic background and user participation trends in innovation, analyzed the shortcomings of traditional design expression and digital media technology, through the use of digital media flash design expression and method, to solve the problem of traditional design expression. Finally, through the expression model of digital media and interactive animation based on flash animation technology, showed that flash obtained the rapid development and application in the multimedia platform.

关键词： Digital media Flash animation technology interactive animation

Numerical Simulation of Spray Characteristics of an Effervescent Atomizer

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

International Journal of Plant Engineering and Management 2009年第2期14卷 108-112页

作者： XIAO Ji-ming TU yong-tao li peng-yang TANG Xiao-peng Xi'an University of Technology Xi'an 710048 China

Using fluid dynamics software Fluent, the spray characteristics of an effervescent atomizer in a downstream flow field was simulated and analyzed, the results show that on the cross sections of the atomizer downstream flow field, the distribution of the atomized droplet size is small and mainly concentrated about Sauter mean diameter （ SMD）, and the distribution of the axial velocity is large, but mainly concentrated about the gas peak velocity in the closer nozzle axis area; the gas peak velocity of the atomized droplet increases, while the droplet SMD decreases with increase of the nozzle caliber and the air pressure; with the increase of the flow rate of cuttingfluid, the atomized droplet SMD increases, while the gas peak velocity rises first and then decreases, but the decrease trend is very small after the air pressure is more than 0. 4 MPa. The simulation results have significance in guiding for designing and applying the effervescent atomizer.

关键词： minimal quantity lubrication effervescent atomization spray characteristics numerical simulation

维普期刊数据库

Solvent-free heterogeneous catalysis for cyanosilylation in PtS topology of Mg-MOF

在线全文

学校读者我要写书评

暂无评论

Solvent-free heterogeneous catalysis for cyanosilylation in ...

Deciphering the role of ultra-low-loaded rhodium in NiFe-MIL-53 for superior oxygen evolution reaction

中国化学会第九届全国无机化学学术会议

作者： Wen-Juan Ji lin Feng yong-peng li Xian-Ming Zhang School of Chemistry ＆ Materials Science Shanxi Normal University

One of the latest developments in organic catalysis involved heterogeneous catalysis based on MOFs whose features of high levels of porosity,functionalized pore walls and relatively easy separation have aroused the intense interest of chemists.[1-3]But so far,there are few reports concerning the cyanosilylation with MOFs as the heterogeneous catalyst under solvent-free ***,the development of a new strategy for the construction of MOFs with high heterogeneous catalytic activity for cyanosilylation is highly *** have been devoted on the assembly of new Mg-MOF with heterogeneous catalytic activity toward C-C bond-forming *** the course of these studies,surprisingly,the Pt S-type MOF[Mg2（abtc）]·4DMI（1）which exhibt Lewis acid Mg-sites,Lewis base azo-groups and approximately 6.3×102 and 8.3×9.6rectangular and rhombic channels of filling ethanol and coordinated DMI *** was initially used as a model substrate,and a loading of 0.1 mol%of 1 could lead to a 99.8%conversion in the absence of *** catalytic behaviors have been enhanced Lewis acidity of coordinatively unsaturated Mg centers and the effective pore volume,and the catalyst can be recycled and reused five times without any significant loss of *** copound1 shows efficient heterogeneous catalytic activity under solvent-free conditions using only a low loading of Mg-MOF catalyst.

关键词： Metal organic framework cyanosilylation heterogeneous catalysis

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 77-86页

作者： Jinzhi Jia Jinhua Zhang Kailu Guo Lanyue Zhang Gening Du Hao You Junfeng Huang Mudong Tu Hua li yong peng Wei Dou Cailing Xu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering School of Materials and Energy Lanzhou University College of Chemistry and Chemical Engineering Luoyang Normal University

Designing highly active and stable electrocatalysts of oxygen evolution reaction （OER） is one of the crucial *** this study,a novel OER electrocatalyst,NiFe-MIL-53 modified with ultra-low rhodium（Rh@NiFe-MIL-53）,is successfully prepared via the hydrothermal ***-situ Raman spectroscopy and electrochemical impedance spectroscopy reveal that the doped Rh accelerates the phase transformation of NiFe-MIL-53 and the in-situ formed Rh@NiFeOOH is the actual active *** importantly,the enhanced reversibility of electrochemical reconstruction between NiFeOOH and NiFe（OH）2after doping Rh is beneficial for improving the electrochemical stability of the catalyst.X-ray photoelectron spectroscopy spectra show the strong electronic interaction between single-atom Rh and Ni/Fe in Rh@***,theoretical calculations confirm that the integration of single-atom Rh into the NiFeOOH successfully reduces the band gap,regulates the d-band center （εd）,accelerates the charge transfer,and optimizes the adsorption behavior of oxygen-containing intermediates,thereby lowering the energy barrier of rate-determining ***,the optimized Rh@NiFe-MIL-53 exhibits excellent OER activity （240 mV） with a small Tafel slope of 48.2 mV dec-1and long-term durability (over1270 h at 10 m A cm-2and 110 h at 200 mA cm-2).This work presents a new perspective on designing highly efficient OER electrocatalysts.

关键词： NiFe-MIL-53 Rh Electrochemical reconstruction Catalytic mechanism Oxygen evolution reaction

Increase in the variability of terrestrial carbon uptake in response to enhanced future ENSO modulation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2025年第1期18卷 32-38页

作者： Younong li li Dan Jing peng Qidong Yang Fuqiang Yang Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Key Laboratory of Atmospheric Environment and Processes in the Boundary Layer over the Low-Latitude Plateau Region Department of Atmospheric ScienceYunnan UniversityKunmingChina

El Niño-Southern Oscillation(ENSO)is a major driver of climate change in middle and low latitudes and thus strongly influences the terrestrial carbon cycle through land-air *** the ENSO modulation and carbon flux variability are projected to increase in the future,but their connection still needs further *** investigate the impact of future ENSO modulation on carbon flux variability,this study used 10 CMIP6 earth system models to analyze ENSO modulation and carbon flux variability in middle and low latitudes,and their relationship,under different scenarios simulated by CMIP6 *** results show a high consistency in the simulations,with both ENSO modulation and carbon flux variability showing an increasing trend in the *** higher the emissions scenario,especially SSP5-8.5 compared to SSP2-4.5,the greater the increase in *** flux variability in the middle and low latitudes under SSP2-4.5 increases by 30.9%compared to historical levels during 1951-2000,while under SSP5-8.5 it increases by 58.2%.Further analysis suggests that ENSO influences mid-and low-latitude carbon flux variability primarily through *** occurrence may potentially be attributed to the increased responsiveness of gross primary productivity towards regional temperature fluctuations,combined with the intensified influence of ENSO on land surface temperatures.

关键词： Carbon variability ENSO modulation CMIP6 models

Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

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) 2025年第1期Mechanics & Astronomy) .卷 132-139页

作者： Xiao Xiang Feng Gao Yu-Gui peng peng Wu Zong-lin li Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and Technology

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of Lxand/or Ly,we unambiguously demonstrate the first-order M?bius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

菱形石墨炔薄膜He分离特性的密度泛函理论研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

物理化学学报 2017年第11期33卷 2219-2226页

作者：李桂霞姜永超李鹏潘维李永平刘云杰青岛农业大学理学与信息科学学院山东青岛266109 青岛农业大学化学与药学院山东青岛266109 中国石油大学(华东)理学院山东青岛266580

氦气在科学和工业等领域中都具有不可替代的作用,其主要存在于天然气中。如何高效地从天然气中分离氦气显得至关重要。本文基于密度泛函理论(DFT)方法系统地探究了菱形石墨炔(rhombic-graphyne,R-GY)分离膜对He和其他天然气组分(Ne、Ar... 详细信息

氦气在科学和工业等领域中都具有不可替代的作用,其主要存在于天然气中。如何高效地从天然气中分离氦气显得至关重要。本文基于密度泛函理论(DFT)方法系统地探究了菱形石墨炔(rhombic-graphyne,R-GY)分离膜对He和其他天然气组分(Ne、Ar、CO_2、N_2和CH_4)的吸附、选择和渗透性能。结果表明,R-GY作为He分离膜可同时满足高选择性和高渗透率的要求。常温下,R-GY薄膜对He/Ne、He/CO_2、He/N_2、He/Ar和He/CH_4的选择性可分别达到2?10~7、3?10^(20)、9?10^(26)、7?10^(37)和5?10^(51),即使在600 K时仍可保持较高水平。此外,由于较低的扩散能垒,He穿透R-GY薄膜的渗透率在常温下可达到10^(-6) mol·m^(-2)·s^(-1)·Pa^(-1),高出工业标准近3个数量级;而其他气体组分在常温下的渗透率仅为10^(-58)-10^(-14) mol·m^(-2)·s^(-1)·Pa^(-1),气体无法渗透R-GY薄膜。

关键词：菱形石墨炔 He分离选择性渗透率密度泛函理论

维普期刊数据库

Mg-pacs-MOFs as luminescent and semi-conducting bifunctional NH3 sensor

在线全文

学校读者我要写书评

暂无评论

Mg-pacs-MOFs as luminescent and semi-conducting bifunctional...