检索结果-南通市图书馆

Chinese Journal of Chemical Engineering 2016年第9期24卷 1290-1297页

作者： Fenglei Bi Jianqiang Shao Zhenhao Xi Ling Zhao di liu Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology Beijing Sanlian Hope Shin-Gosen Technical Service Co. Ltd.

Poly（m-xylylene adipamide）/poly（ethylene terephthalate）（MXD6/PET） copolymers are synthesized by melt copolycondensation with 1–5 wt% low molecular weight PET oligomers into the MXD6 oligomers at 260 ℃.FR-IR and1 H NMR analysis results indicate that the interchange reaction has occurred between MXD6 oligomers and PET oligomers. The thermal behavior of copolymers shows that the melting temperature of MXD6/PET copolymers decreases with the increasing of amount of PET oligomers, while the crystallization temperature accordingly increases. And the equilibrium temperature Tm0 is evaluated to be 251.8 ℃ for the copolymers with5 wt% PET oligomer adding, which is very close to that of neat MXD6. The tensile and impact strength of MXD6/PET copolymers are significantly improved than that of pure MXD6 by mechanical properties test, and the microfibril structure in the impact fracture sample＇s surface reveals the feature of ductile fracture.

关键词： Polymerization Poly(m-xylylene adipamide) Poly(ethylene terephthalate) Crystallization Mechanical properties

Investigation of SiGe-on-Insulator Novel Structure

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2004年第z2期22卷 13-16页

作者： Lin Chenglu liu Weili An Zhenghua di Zengfeng Zhang Miao Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China Shanghai SIMGUI Technology Co. LtdShanghai Jiading 201821China Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Shanghai SIMGUI Technology Co. LtdShanghai Jiading 201821China

SiGe-on-Insulator (SGOI) is an ideal substrate material for realizing strained-silicon structures that are very competing and popular in present silicon technology. In this paper, two methods are proposed to fabricate SGOI novel structure. One is modified Separation by Implantation of Oxygen (SIMOX) starting from pseuodomorphic SiGe thin film without graded SiGe buffer layer. Results show that two-step annealing can improve the cystallinity quality of SiGe and block the Ge diffusion in high temperature annealing. SGOI structure with good quality has been obtained through two-step annealing. The second method is proposed to achieve SGOI with high content of Ge. High quality strained relax SiGe is grown on a compliant silicon-on-insulator (SOI) substrate by UHCVD firstly. During high temperature oxidation,Ge atoms diffuse into the top Si layer of SOI. We successfully obtain SGOI with the Ge content of 38%, which is available for the growth of strained Si.

关键词： SGOI SIMOX SOI strained Si

Nanopore sequencing: a rapid solution for infectious disease epidemics

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(Life Sciences) 2019年第8期62卷 1101-1103页

作者： Ying Cao Jing Li Xin Chu Haizhou liu Wenjun liu di liu Center for Emerging Infectious diseases Wuhan Institute of VirologyChinese Academy of SciencesWuhan430071China Research Group of Computer Virology Center for Bacteria and Virus Resources and ApplicationWuhan Institute of VirologyChineseAcademy of SciencesWuhan430071China Institute of Microbiology Chinese Academy of SciencesBeijing100101China Bureau of Major R&D Programs Chinese Academy of SciencesBeijing100864China University of Chinese Academy of Sciences Beijing100049China

Emerging and re-emerging infectious diseases have given rise to a large number of human infections,morbidity,and heavy economic burden,including the Middle East respiratory syndrome caused by a coronavirus in 2012,global influenza pandemic caused by the H7N9 influenza A virus in2013,Ebola epidemic in West Africa in 2014,and Lassa fever epidemic in Nigeria in *** healthcare war against viruses deserves constant surveillance due to the continuous emergence of new viruses and rapid evolution of existing viruses(liu and liu,2017).

关键词： pro RNA Nanopore sequencing a rapid solution for infectious disease epidemics

One-step post-treatment boosts thermoelectric properties of PEDOT:PSS flexible thin films

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第1期132卷 81-89页

作者： Xingyu liu Xiao-Lei Shi Li Zhang Wei-di liu Yanling Yang Zhi-Gang Chen School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021China School of Chemistry and Physics Queensland University of TechnologyBrisbaneQLD 4000Australia Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQLD 4072Australia

Developing high-performance poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)sig-nificantly widens the practical applications of flexible organic thermoelectric devices,while the water-based co-solvent dopants and/or post-treatments are still rarely studied so ***,we develop a one-step post-treatment to improve the power factor of PEDOT:PSS films by using a water-based solution,which is composed of co-solvent(polar solvent dimethylacetamide(DMAC)and deionized water)and organic reducing agent L-ascorbic acid(LAA).The 80 vol.%DMAC solution significantly boosts the room-temperature electrical conductivity of the films from 5 to 964 S cm^(−1),while the Seebeck coefficient can be further enhanced from 18.7 to 25μV K−1 by treating with 0.5 mol L−1 LAA,contributing to a sig-nificantly improved power factor of 55.3μW m^(−1)K^(−2).The boosted electrical conductivity is ascribed to the separated PEDOT and PSS phases triggered by the high dielectric constant and polarity of DMAC;while the improved Seebeck coefficient is attributed to the reduced oxidation degree of PEDOT from the reducing agent LAA,both confirmed by the comprehensive structural and morphological ***,a maximum power factor of 64.4μW m^(−1)K^(−2)can be achieved at 360 K and the observed temperature-dependent electrical transport behavior can be well explained by the Mott variable range hopping ***,a flexible thermoelectric device,assembled by the as-fabricated PEDOT:PSS films,exhibits a maximum output power of∼23 nW at a temperature difference of 25 K,indicating the potential for applying to low-grade wearable electronics.

关键词： Thermoelectric PEDOT:PSS Post-treatment dimethylacetamide L-ascorbic acid

Recent advances in high-performance triboelectric nanogenerators

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

Nano Research 2023年第9期16卷 11698-11717页

作者： di liu Yikui Gao Linglin Zhou Jie Wang Zhong Lin Wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China College of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

The development of the Internet of Things(IoT)and artificial intelligence has accompanied the evolution of energy demand and structure in the new era,and the power sources for billions of distributed electronics and sensors have aroused worldwide *** an alternative energy harvesting technology,triboelectric nanogenerators(TENGs)have received remarkable attention and have shown attractive potential applications for use in micro/nano power sources,self-powered sensors,highvoltage power sources,and blue energy due to their advantages of small size,light weight,flexibility,low cost,and high efficiency at low *** this review,we discuss high-performance TENGs from the perspectives of triboelectric charge density,output voltage,energy density,and corresponding quantification *** these topics,the limitations,optimization methods and techniques,and potential directions to challenge these limits are comprehensively discussed and ***,we discuss the emerging challenges,strategies,and opportunities for research and development of highperformance TENGs.

关键词： high-performance triboelectric nanogenerator(TENG) charge density voltage energy density average power density

Increasing the Content of β Phase of Poly(9,9-dioctylfluorene) by Synergistically Controlling Solution Aggregation and Extending Film-forming Time

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 Journal of Polymer Science 2019年第7期37卷 664-673页

作者： Ya-di liu Qiang Zhang Xin-Hong Yu Jian-Gang liu Yan-Chun Han State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China

For poly(9,9-dioctylfluorene)(PFO),β phase (coplanar conformation with the intra-chain torsion angle of 165°) has a greater conjugation length and higher degree of order compared to those of α phase, which favors charge carrier transport. However, the highest content of β phase obtained so far is 45%. We propose to increase the content of β phase by promoting the solution aggregation of PFO molecules and extending film-forming time. For this purpose, 1,8-diiodooctane (diO) is added to PFO o-xylene solution, which enhances the interaction of PFO chains and improves the planarity of PFO backbone, resulting in the formation of ordered aggregation. The aggregates act as nucleation centers to promote the formation of β phase. The content of β phase increases with increasing diO concentration and reaches a platform of 39% as diO is more than 4 vol%. Furthermore, the film is kept in a sealed environment with oxylene atmosphere for 3 h, thus the PFO molecules have enough time to diffuse to the crystallization front and achieve disorder-order transition. As a result, the crystallinity of PFO is improved significantly and the content of β phase increases to 52%, reaching the highest value reported so far.

关键词： β Phase Ordered aggregation Film-forming time disorder-order transition

The new emerging H7N9 influenza virus indicates poultry as new mixing vessels

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2014年第7期57卷 731-732页

作者： liu di GAO George F. Key Laboratory of Pathogenic Microbiology and Immunology Institute of MicrobiologyChinese Academy of Sciences Network Information Center Institute of MicrobiologyChinese Academy of Sciences Beijing Institutes of Life Science Chinese Academy of Sciences Office of director-General Chinese Center for Disease Control and Prevention

Since 30 March 2013,the Chinese Center for disease Control and Prevention(China CDC)has reported the first laboratory-confirmed cases of influenza A H7N9 virus human *** new pathogen caused 144 human infections with 47 fatal cases in year 2013,and continued to bring another wave in 2014,caused another 273 infections with 108deaths as of 27th *** H7N9 influenza virus has again raised the global concerns of the potential *** of the origin and evolution of this virus revealed that the novel H7N9 influenza virus was reassorted from H7,N9and H9N2 subtypes of influenza viruses from domestic ducks,wild waterfowls and poultry,respectively;and the processes of genetic reassortments were sequential and dynamic[1?3].

关键词：甲型流感病毒中国疾病预防控制中心混合容器家禽 H9N2亚型人类感染全球性问题野生水禽

Population Genetic Analysis of the Rice Stem Borer, Chilo suppressalis, in the South China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2013年第6期12卷 1033-1041页

作者： liu Yu-di HOU Mao-lin WU Yu-chun liu Gui-qin State Key Laboratory for Biology of Plant diseases and Insect Pests/Institute of Plant Protection Chinese Academy of Agricultural Sciences Guangdong Provincial Public Laboratory on Wild Animal Conservation and Management Guangdong Entomological Institute

Genetic variation and patterns of genetic differentiation of the rice stem borer, Chilo suppressalis （Lepidoptera： Pyralidae）, from the South China were analyzed using 6 microsatellite markers and two partial mtDNA （cox1 and cox2） regions. All of the 6 microsatellite loci were polymorphic in the studied seven populations. The allelic richness per population ranged between 5.67 and 14.00, and average H E and H O values were 0.6246-0.8329 and 0.2634-0.6061, respectively. As the mitochondrial genome is a single genetic locus, we only present results for the concatenated data set （cox1 plus cox2 gene sequences, 513 bp）. The concatenated data showed high level of genetic diversity and there are 23 variable polymorphic sites among the 513 sites in concatenated data. Nearly all of （20 of 21） pairwise F ST comparisons among populations showed genetic differentiation with moderate to high pairwise F ST values based on microsatellite markers. However, for the mtDNA data, most of the seven populations did not show significant differentiation with other populations. The differences of population differentiation obtained with the two different genetic markers could be mainly attributed to the different mutation rates of microsatellite and mtDNA. There was not genetic structure existed in these studied populations based on microsatellite loci and mtDNA data. The analysis based on network, mismatch distribution, Tajima＇s D and F S indicated that the studied populations were from the recent same ancestor or the same refuge and followed by a sudden demographic expansion condition.

关键词： Chilo suppressalis microsatellite markers mtDNA cox1 and cox2 gene genetic variation population differentiation population structure

Asymmetric Model of the Quantum Stackelberg Duopoly

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第12期30卷 9-12页

作者： WANG Xia liu di ZHANG Jun-Pei Wenhua College Huazhong University of Science and TechnologyWuhan 430074 School of Foreign Languages Wuhan Textile UniversityWuhan 430077 Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074

A more efficient model of the quantum Stackelberg duopoly is proposed by using the asymmetric quantization scheme of Qin et *** this model,two entanglement factorsα(α=√γ1/γ2)andγ(γ=√γ1γ2)are introduced,which greatly expands the functions of the previously reported symmetric *** choosing proper values ofαandγ,one can better manage the market,such as suppressing the first-mover advantage and enhancing the second-mover profit to avoid abuse of oligopolistic competition,and optimizing the total quantity of the products,so to overcome the deficiencies of"first mover always wins"and"positive quantum entanglement always reduces the total quantity"in the symmetric *** proposed model here is believed to be a good tool for the government and the department to improve the economic efficiency and develop the market.

关键词： symmetric quantum Stackelberg

A Key Management Scheme Based on Hypergraph for Fog Computing

在线全文

学校读者我要写书评

暂无评论

China Communications 2018年第11期15卷 158-170页

作者： Zhi Li Yanzhu liu di liu Chunyang Li Wei Cui Guanglin Hu State Grid Information & Telecommunication Group Co. Ltd. Beijing 102211 China Great Wall Computer Software and Systems Inc. Beijing 100190 China

Fog computing is a new paradigm supporting the stringent requirements of mobility applications by bridging cloud computing and smart devices. Since the smart devices may be deployed in dynamic areas where are out of strict monitoring and protection, fog computing requires security protections to ensure confidentiality and integrity. In this article, to deal with security requirements and considering the distinctive features, a key management based on hypergraph schemed is designed. Firstly, based on the key hypergraph, the three hierarchy architecture of fog computing is divided into two subnetworks. Furthermore, each key management process of both two subnetworks is designed to satisfy the operational and security requirements of fog computing. Finally, the performance evaluation and numerical simulation have been provided to validate the proposed scheme.

关键词： fog computing fog security keymanagement hypergraph