检索结果-南通市图书馆

Facile Preparation of Electromagnetic Interference Shielding Materials Enabled by Constructing Interconnected Network of Multi-walled Carbon Nanotubes in a Miscible Polymeric Blend

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2020年第6期38卷 593-598页

作者： qi-yan zhang Han-Song Li Bao-Hua Guo Zhao-Xia Guo Jian Yu Key Laboratory of Advanced Materials(Ministry of Education) Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Electromagnetic interference(EMI)shielding materials are in great demand in electronic equipment and our surrounding environment to resist the increasing serious radiation *** with their metal counterparts,conductive polymer composites(CPCs)have unique advantages of lightweight,corrosive resistance,low cost,and excellent processability,and are therefore an ideal choice for developing high-performance EMI shielding ***,CPCs based EMI shielding materials are limited to high filler loading,which caused poor mechanical properties and ***,we demonstrate a facile and highly scalable approach to develop high-performance EMI shielding materials with low filler loading by using miscible poly(phenylene oxide)/polystyrene(PPO/PS)blend as the *** contrast to PS/carbon nanotubes(CNTs)composites,PPO/PS/CNTs composites show much higher EMI shielding effectiveness caused by good dispersion of CNTs and highly interconnected conductive *** excellent EMI shieling effectiveness of 23-25 dB is achieved for PPO/PS/10%CNTs composites with a thickness of only 375 pm;which is superior to most of reported polymer/CNTs composites prepared by *** addition,the results show that although absorption is the major shielding mechanism,the contribution of reflection is also important and closely related to the connectivity of conductive network,as well as the electrical conductivity of the CPCs.

关键词： Conductive polymer composites Polymer blend Electromagnetic interference shielding Conductive network Dispersion

Boosting lithium storage performance of Si nanoparticles via thin carbon and nitrogen/phosphorus co-doped two-dimensional carbon sheet dual encapsulation

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第6期40卷 1347-1356页

作者： Cheng-Zhi Ke Fang Liu Zhi-Ming Zheng He-He zhang Meng-Ting Cai Miao Li qi-zhang yan Hui-Xin Chen qiao-Bao zhang Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005China Department of Nanoengineering University of California San DiegoLa JollaCA 92093USA Xiamen Institute of Rare Earth Materials Haixi InstitutesChinese Academy of SciencesXiamen 361021China

Silicon(Si)is a promising anode candidate for next-generation lithium-ion batteries(LIBs),but it suffers from poor electronic conductivity and dramatic volume variation during cycling,which poses a critical challenge for stable battery *** mitigate these issues simultaneously,we propose a"double carbon synergistic encapsulation"strategy,namely thin carbon shell and nitrogen/phosphorus co-doped two-dimensional(2D)carbon sheet dual encapsulate Si nanoparticles(denoted as 2D NPC/C@Si).This double carbon structure can serve as a conductive medium and buffer matrix to accommodate the volume expansion of Si nanoparticles and enable fast electron/ion transport,which promotes the formation of a stable solid electrolyte interphase film during *** structural advantages,the resulting 2 D NPC/C@Si electrode demonstrates a high reversible capacity of592 mAh·g^(-1) at 0.2 A·g^(-1) with 90.5%excellent capacity retention after 100 cycles,outstanding rate capability(148 mAh·g^(-1) at 8 A·g^(-1)),and superior long-term cycling stability(326 mAh·g^(-1) at 1 A·g^(-1) for 500 cycles,86%capacity retention).Our findings elucidate the development of high-performance Si@C composite anodes for advanced LTBs.

关键词： Silicon@carbon composites Anode Nitrogen/phosphorus co-doped carbon Lithium-ion battery

Panda Habitat Added to World Heritage List

在线全文

学校读者我要写书评

暂无评论

China & The World Cultural Exchange 2006年第9期72卷 25-27页

作者： qi Mei & zhang yan

“Bamboo has blossomed. Held in her mother’s arms, Mimi is counting the number of stars in the sky. How beautiful the stars are and where is my breakfast tomorrow... 详细信息

“Bamboo has blossomed. Held in her mother’s arms, Mimi is counting the number of stars in the sky. How beautiful the stars are and where is my breakfast tomorrow...

关键词：世界遗产目录大熊猫生活环境自然保护区栖息地

Percutaneous drug-eluting stent implantation in dextrocardia:case report

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

Chinese Medical Journal 2007年第3期120卷 248-250页

作者： zhang qi zhang Rui-yan HU Jian SHEN Wei-feng Department of Cardiology Shanghai Ruijin Hospital Medical School of Shanghai Jiaotong Unisersity Shanghai 200025 China

Although situs inversus with dextrocardia is a rare clinical phenomenon, the association with coronary artery disease（CAD） is at the same frequency as in the general popuLation. Few cases of dextrocardia complicated with CAD was reported before. The feasibility and prognosis of percutaneous coronary intervention （PCI） in such case still remains unclear because of the uncommon anatomical abnormality, especially in the drug-eluting stent （DES） era. Here we report a female case with dextrocardia and CAD was successfully treated by DES implantation.

关键词： dextrocardia coronary stent

Computational studies of eletrochemical CO2 reduction on Cu4S cluser

在线全文

学校读者我要写书评

暂无评论

Computational studies of eletrochemical CO2 reduction on Cu4...

Linear free energy relationships between stability of complex and basicity of ligands——Ⅴ.The stability of complex formed from 1,10-phenanthroline,N-（p-substituted phenyl）glycines with copper（Ⅱ）,nickel（Ⅱ）,cobalt（Ⅱ） and zinc（Ⅱ）

第十三届全国量子化学会议

作者： qi-yan zhang Hai-yan Zhu Institute of Modern Northwest University

With the rapid development of the global economy,the environmental problems caused by CO have become the focus of attention[1].The electrochemical reduction of CO is widely concerned because of its high reduction efficiency at room temperature and atmospheric pressure,it also can reduce the activation energy during reduction[2].At present,liu et *** reduced CO to CH by electrochemical reduction on Cu cluster, but the reaction potential is higher and the reaction rate is slower[3].In order to overcome these problems, we through the method of modifying the electrode[4],doped with metal S on Cu metal cluster,and used toluene as solvention to conduct electrochemical reduction of *** results show that CuS clusters can reduce the potential barrier and increase the reaction *** product CH and little CHOH can be applied in real life, so it has very important practical significance.

关键词： CO2 electrochemical reduction Modified electrode

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

Acta Chimica Sinica(English Edition) 1984年第2期2卷 128-132页

作者： CHEN Rong-Ti(Y.T.Chen) MA Zang-Yun zhang qi-yan Department of Chemistry,Nankai University,Tianjin Department of Chemistry Nankai University Tianjin

The formation constants(log KMABMA)of ternary mixed ligand complex formed from1,10-phenanthroline（A,phen）and N-（p-substituted phenyl）glycines,R--NHCH2COOH（B,p-RPhG,R=CH3O,CH3,H,C1）,with copper（Ⅱ）,nickel（Ⅱ）,cobalt（Ⅱ）andzinc（Ⅱ）were deter-mined by pH method at 25℃ in 30%（V/V）ethanol solution in presence of 0.1 M *** wasfound that linear free energy relationships exist between the stability of M（Ⅱ）-phen-p-RPhG ternarycomplex and the base strengths of the ligands p-RPhG,conforming to the equation log KMABMA=α pKB+*** factors influencing the stability of the ternary complex have been *** enhancementof stability of ternary complex was explained in terms of formation of π back bonding between metalion and the ligand *** contrast to the binary system,the ternary ni（Ⅱ）and zn（Ⅱ）complexesshowed higher stability which could be accounted for by the formation of π back bonding and byintramolecular ligand-ligand interaction,possibly aromatic-ring stacking.

关键词： cobalt nickel p-substituted phenyl)glycines with copper Linear free energy relationships between stability of complex and basicity of ligands The stability of complex formed from 1,10-phenanthroline,N and zinc free

Outcomes of primary percutaneous coronary intervention for acute ST-elevation myocardial infarction in patients aged over 75 years

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2006年第14期119卷 1151-1156页

作者： zhang qi zhang Rui-yan zhang Jian-sheng HU Jian yanG Zhen-kun ZHENG Ai-fang zhang Xian SHEN Wei-feng Department of Cardiology Shanghai Ruijin Hospital School of Medicine Shanghai Jiao Tong University Shanghai 200025 China

Background The optimal reperfusion strategy in elderly patients with ST-elevation myocardial infarction （STEMI） remains unclear. The purpose of this study was to evaluate the safety, in-hospital and one-year clinical outcomes for patients 〉75 years of age with STEMI receiving primary percutaneous coronary intervention （PCI）, compared with those treated by conservative approach. Methods One hundred and two patients 〉75 years of age with STEMI presented 〈12 hours were randomly allocated to primary PCI （n=50） or conservative therapy only （n=52）. The baseline characteristics, in-hospital outcome and major adverse cardiac events （MACE）, including death, non-fatal myocardial infarction and target vessel revascularization at one-year clinical follow-up were compared between the two groups. Results Age, gender distribution, risk factors for coronary artery disease, infarct site and clinical functional status were similar between the two groups, but the patients in primary PCI group received less low-molecular- weight heparin during hospitalization. Compared with conservative group, the patients in primary PCI group had significantly lower occurrence rate of re-infarction and death and shortened hospital stay. The composite endpoint for in-hospital survivals at 30-day follow-up was similar between the two groups, but one-year MACE rate was significantly lower in the primary PCI group （21.3% and 45.2%, P=0.029）. Left ventricular ejection fraction was not significantly changed in both groups during follow-up. Multivariate analysis revealed that primary PCI （OR=0.34, 95% CI： 0.21-0.69, P =0.03） improved MACE-free survival rate for STEMI patients aged 〉 75 years. Conclusion Our results indicated that primary PCI was safe and effective in reducing in-hospital mortality and one-year MACE rate for elderly patients with STEMI.

关键词： myocardial infarction elderly angioplasty outcome

Metal nanoparticles decorated CoFe-(oxy)hydroxysulfides nanosheets fabricated by a general strategy for electrocatalytic water splitting

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 26-38页

作者： Xiaodong yang Haochen Shen Xiaoming Xiao Zhichao Li qi Zhou Wei yang Bin Jiang Yongli Sun Luhong zhang Zhenhua yan School of Chemical Engineering and Technology Tianjin University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University

This study presents a novel method to fabricate metal-decorated,sulfur-doped layered double hydroxides （M/SLDH） through spontaneous redox and sulfurization *** developed Ag/SLDH and Pt/SLDH catalysts with abundant heterogeneous interfaces and hierarchical nanostructures demonstrated outstanding oxygen evolution reaction （OER） and hydrogen evolution reaction （HER） performance,achieving low overpotentials of 212 and 35 mV at 10 mA cm-2in 1 M KOH,*** both anode and cathode in water splitting,they required only 1.47 V to reach 10 mA cm-2and exhibited high structural robustness,maintaining stability at 1000 mA cm-2for 300 ***-situ Raman analysis revealed that the synergistic effects of metal nanoparticles and S doping significantly promote the transformation into the S-Co1-xFexOOH layer,which serves as the active phase for water ***,ultraviolet photoelectron spectroscopy （UPS） and density functional theory （DFT） analyses indicated that incorporating metal nanoparticles and S doping increase electron density near the Fermi level and reduce reaction energy barriers,thus enhancing intrinsic OER and HER *** study provides a scalable strategy for synthesizing high-performance electrocatalysts for water splitting,with promising potential for broader applications.

关键词： Ultraviolet photoelectron spectroscopy

Improving displayed resolution in convolution reconstruction of digital holograms

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Optoelectronics Letters 2006年第4期2卷 305-307,311页

作者： FAN qi zhang yan-cao WANG Jun DI Jiang-lei Institute of Optical Information Science and Technology School of Science Northwestern Polytechnical University Xi＇an 710072 China

In digital holographic microscopy, when the object is placed near the COD, the Fresnel approximation is no longer valid and the convolution approach has to be applied. With this approach,the sampling spacing of the reconstructed image plane is equal to the pixel size of the COD. If the lateral resolution of the reconstructed image is higher than that of the COD,Nyquist sampling criterion is violated and aliasing errors will be introduced. In this Letter,a new method is proposed to solve this problem by investigating convolution reconstruction of digital holograms. By appending enough zeros to the angular spectrum between the two FFT＇s in convolution reconstruction of digital holograms,the displayed resolution of the reconstructed image can be improved. Experimental results show a good agreement with theoretical analysis.

关键词：全息光学数字技术卷积重建显示技术