检索结果-南通市图书馆

Flexural Performance of CFRP-Bamboo Scrimber Composite Beams

在线全文

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2019年第12期7卷 1295-1307页

作者： Xizhi Wu Xueyou Huang xianjun li Yiqiang Wu College of Materials Science and Engineering Central South University of Forestry and TechnologyChangsha410082China Yihua life Science and Technology Co. Ltd.Shantou515000China Hunan Special Equipment Inspection and Testing Institute Changsha410082China

This study presents a new structure made up of bamboo scrimber and carbon fiber reinforced polymer(CFRP)to address the low stiffness and strength of bamboo ***-point bending test and finite element model were conducted to study the failure mode,strain-displacement relationship,load-displacement relationship and relationships between strain distribution,contact pressure and deflection,and adhesive *** results indicated that the flexural modulus and static flexural strength of the composite beams were effectively increased thanks to the CFRP *** flexural modulus of the composite specimens were 2.33-2.94 times that of bamboo scrimber beams,and the flexural strength were 1.49-1.58 times that of bamboo scrimber *** debonding had a great influence on the strain distribution and deflection of the composite *** was an important factor for the failure of the CFRP-bamboo scrimber composite *** to the finite element simulation,the strain distribution,contact pressure and deflection also greatly changed with the adhesive *** complete peeling,the deflection of the specimen was 3.09 times that of the unpeeled because it was no longer an integral beam.

关键词： Bamboo scrimber carbon fiber reinforced polymer(CFRP) flexural performance adhesive debonding

Preparation of layered oxide li(Co_(1/3)Ni_(1/3)Mn_(1/3))O_2 via the sol-gel process

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 2008年第2期27卷 158-164页

作者： ZHANG Wen liU Hanxing HU Chen ZHU xianjun li Yanxi State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

To obtain homogenous layered oxide li（Co1/3Ni1/3Mn1/3）O2 as a lithium insertion positive electrode material, the sol-gel process using citric acid as a chelating agent was applied. The material li（Co1/3Ni1/3Mn1/3）O2 was synthesized at different calcination temperatures. XRD experiment indicated that the layered li（Co1/3Ni1/3Mn1/3）O2 material could be synthesized at a lower temperature of 800℃, and the oxidation state of Co, Ni, and Mn in the cathode confirmed by XPS were ＋3, ＋2, and ＋4, respectively. SEM observations showed that the synthesized material could form homogenous particle morphology with the particle size of about 200 nm. In spite of different calcination temperatures, the charge-discharge curves of all the samples for the initial cycle were similar, and the cathode synthesized at 900℃ showed a small irreversible capacity loss of 11.24% and a high discharge capacity of 212.2 mAh·g^-1 in the voltage range of 2.9-4.6 V.

关键词： lithium-ion battery layered transition metal oxide sol-gel process high capacity

Technological Breakthrough and Domestic Substitution of Key Products Based on Asymmetric Competition:Taking the Integrated Circuit Industry as an Example

在线全文

学校读者我要写书评

暂无评论

Frontiers of Business Research in China 2023年第3期17卷 379-406页

作者： liU Jianli li xianjun Institute of Industrial Economics Chinese Academy of Social SciencesBeijing 100006China

Integrated circuit is a typical key product in the digital economy *** external containment,breakthroughs in core technologies of integrated circuit are confronted with barriers of first movers in underlying technological ecology and with their threats of decoupling from the supply ***,China has various bottlenecks in the proprietary industrial ecosystem,and domestic substitution lacks effective overall ***,it is essential to apply the underlying logic of asymmetric competition and to leverage a relatively complete industrial system,abundant application scenarios,solid talent base,and the institutional advantages of the new system for mobilizing resources nationwide to break through in integrated circuit manufacturing technologyand in domestic *** such,it is necessary to further strengthen the top-level design,leverage the advantages of the new system for mobilizing resources nationwide to enhance the institutiona1lguarantee for domestic substitution of bottlenecks,and enhance basic research to consolidate the technological foundation for domestic ***,we should implement talent strategy to enhanceethe driving force of human resource for domestic substitution *** should also further opening-up and cooperation policy to create an open domestic substitution *** addition,we should increase counter-cyclical investment to nurture leaderssin asymmetric competition,and seize the demand window to drive domestic substitution with"epoch-making products."

关键词： key products technological catch-up domestic substitution asymmetric competition integrated circuit

Preparation and Characterization of Phenolic Prepolymer Impregnated Chinese Fir by Cyclic Increasing-Pressure Method with Green and Efficient

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2020年第11期8卷 1473-1488页

作者： Yuan Zhang Ping li Yiqiang Wu Guangming Yuan xianjun li Yingfeng Zuo College of Materials Science and Engineering Central South University of Forestry and TechnologyChangsha410004China National Joint Engineering Research Center for Green Processing Technology of Agricultural and Forestry Biomass Changsha410004China

The Chinese fir wood was impregnated using a cyclic increasingpressure method(CIPM)with phenolic prepolymers as the impregnating *** Chinese fir and progressive increasing-pressure method(PIPM)impregnated Chinese fir were used as reference samples and were compared and *** product’s chemical structure,internal morphology,crystal structure,and heat resistance were *** transversal and longitudinal sections showed better filling effects,so that it bore greater external loading and reduced the water storage *** infused more phenolic prepolymer into the Chinese *** only producing more physical filling but also forming more hydrogen bond associations and chemical bond *** with PIPM and unmodi-fied Chinese fir,the CIPM impregnated Chinese fir had better mechanical strength and water *** cellulose chains in CIPM impregnated Chinese fir were more closely linked and their crystallinity were clearly *** in internal morphology and crystal structure explained the reason why the mechanical properties and water resistance of CIPM impregnated Chinese fir were improved *** Chinese fir had lower thermal decomposition rates,higher decomposition residual rates,and smaller combustion flames,which confirmed that it possessed improved heat and fire resistance.

关键词： Chinese fir phenolic prepolymer cyclic increasing pressure method chemical structure crystalline structure heat resistance

Highly Efficient Hydrogenation of Methyl Propionate to Propanol over Hydrous Zirconia Supported Ruthenium

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 Chemistry 2011年第2期29卷 229-236页

作者： Fan Guangyin Zhou Yafen Fu Haiyan Ye Xiaoli li Ruixiang Chen Hua li xianjun Key Lab of Green Chemistry and Technology Ministry of Education College of Chemistry Sichuan University Chengdu Sichuan 610064 China College of Chemistry and Chemical Engineering China West Normal University Nanchong Sichuan 637002 China

Hydrous zirconia supported ruthenium catalyst Ru/ZrO2 xH2O, prepared by co-precipitating ruthenium trichloride and zirconium oxychloride with ammonia, was able to catalyze efficiently methyl propionate to propanol under the mild conditions. In aqueous system, the propanol yield of 〉99% was achieved under the conditions of reaction temperature of 150 ℃ and hydrogen pressure of 5.0 MPa, while in non-aqueous system the maximum propanol yield was only 47.0%. FTIR spectra and hydrogenation results indicated that the high catalytic performance of Ru/ZrO2 xH2O in aqueous phase results from the cooperation effect between water as a solvent and hydroxyl groups on the surtace of carrier.

关键词： ruthenium zirconium carboxylic acid ester alcohol hydrogenation

NaOH and Ba(OH)_2 Compound Catalyzed PhenolResorcinol-Formaldehyde Copolycondensation Resin Adhesive for Recombined Bamboo

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2019年第2期34卷 459-464页

作者：左迎峰 liU Wenjie XIAO Junhua li xianjun ZHAO Xing 吴义强 College of Materials Science and Engineering Central South University of Forestry and Technology Hunan Provincial Collaborative Innovation Center for High-efficiency Utilization of Wood and Bamboo Resources Central South University of Forestry and Technology

In order to reduce the curing temperature, shorten the curing time of phenol-formaldehyde(PF) resin adhesive, and ensure the good water-solubility, NaOH and Ba(OH)_2 were used as compound catalysts. The influences of the adding time of Ba(OH)_2, the adding amount of NaOH, Ba(OH)_2 and resorcinol on the properties of adhesives were studied. The properties of NaOH catalyzed phenol-formaldehyde(PF) adhesive, NaOH and Ba(OH)_2 compound catalyzed PF adhesive, NaOH and Ba(OH)_2 compound catalyzed phenol-resorcinol-formaldehyde(PRF) adhesive, and the prepared recombinant bamboo with three kinds of adhesives were compared. The experimental results show that NaOH and Ba(OH)_2 compound catalyst not only shortens the curing time of PF adhesive, but also guarantees the suitable water solubility of adhesive. After copolycondensation with resorcinol, the curing time of adhesive is further shortened, the water solubility is improved obviously, and the highest bonding strength is obtained. Infrared spectrum analysis shows that the reaction activity point of NaOH and Ba(OH)_2 compound catalyzed PRF adhesive will increase, so that both the curing temperature and curing enthalpy decrease.

关键词： phenol-formaldehyde resin NaOH,Ba(OH)2 compound catalytic resorcinol recombined bamboo

Sustainable wood-based nanotechnologies for photocatalytic degradation of organic contaminants in aquatic environment

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2021年第4期15卷 19-40页

作者： Xinyi liu Caichao Wan xianjun li Song Wei Luyu Zhang Wenyan Tian Ken-Tye Yong Yiqiang Wu Jian li College of Materials Science and Engineering Central South University of Forestry and TechnologyChangsha410004China Material Science and Engineering College Northeast Forestry UniversityHarbin150040China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore Yihua lifestyle Technology Co. LtdHuaidong Industrial ZoneLianxia TownChenghai DistrictShantou515834China Caichao Wan

Wood-based nanotechnologies have received much attention in the area of photocatalytic degradation of organic contaminants in aquatic environment in recent years,because of the high abundance and renewability of wood as well as the high reaction activity and unique structural features of these ***,we present a comprehensive review of the current research activities centering on the development of wood-based nanocatalysts for photodegradation of organic *** review begins with a brief introduction of the development of photocatalysts and hierarchical structure of *** review then focuses on strategies of designing novel photocatalysts based on wood or its recombinants(such as 1D fiber,2D films and 3D porous gels)using advanced nanotechnology including sol-gel method,hydrothermal method,magnetron sputtering method,dipping method and so ***,we highlight typical approaches that improve the photocatalytic property,including metal element doping,morphology control and semiconductor ***,the structure-activity relationship of photocatalysts is ***,a brief summary and prospect of wood-derived photocatalysts is provided.

关键词： Wood Nanocatalysts Photodegradation Organic contaminants Composites

Regulation of different light conditions for efficient biomass production and protein accumulation of Spirulina platensis

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and limnology 2024年第1期42卷 174-186页

作者： Yufei ZHANG xianjun li Yuhui li Shiqi liU Yanrui CHEN Miao JIA Xin WANG Lu ZHANG Qiping GAO liang ZHANG Daoyong YU Baosheng GE State Key Laboratory of Heavy Oil Processing and Center for Bioengineering and Biotechnology China University of Petroleum(East China)Qingdao 266580China Tongwei Co. Ltd.Healthy Aquaculture Key Laboratory of Sichuan ProvinceChengdu 610093China

light plays an important role in the photosynthesis and metabolic process of ***,how different light conditions regulate the biomass production and protein accumulation of microalgae is mostly *** this study,the influence of different light conditions,including light colors,densities,and light:dark cycles on the cell growth and biochemical composition of Spirulina platensis was symmetrically *** different colored lights,*** all shows an increase trend within the increased light intensity ranges;however,each showing different optimal light *** the same light intensity,different colored lights show different growth rate of *** following the sequence of red>white>green>yellow>*** maximum growth rate and protein accumulation were determined as 21.88 and 5.10 mg/(L·d)when illuminated under red *** energy efficiency of different light sources was calculated and ranked as red>white>blue≈green>*** analysis suggests that red light can promote cell growth and protein accumulation by upregulating genes related to photosynthesis,carbon fixation,and C-N metabolism *** study provides a conducive and efficient way to promote biomass production and protein accumulation of *** by regulating light conditions.

关键词： microalgae light emitting diode protein accumulation biomass production transcriptomic analysis

在线全文

学校读者我要写书评

暂无评论

论中国式教育现代化话语体系构建

南京师大学报（社会科学版） 2023年第4期 26-37页

作者：李先军华中师范大学教育学院武汉430079

党的二十大报告提出要建立社会主义现代化国家,以中国式现代化推进民族复兴,并提出要加快构建中国话语和中国叙事体系。当前,中国式教育现代化已经取得了举世瞩目的成就,但与其在国际上所拥有的话语权并不匹配。为了更好地讲述中国教育... 详细信息

党的二十大报告提出要建立社会主义现代化国家,以中国式现代化推进民族复兴,并提出要加快构建中国话语和中国叙事体系。当前,中国式教育现代化已经取得了举世瞩目的成就,但与其在国际上所拥有的话语权并不匹配。为了更好地讲述中国教育故事,推动中国教育走向世界,中国式教育现代化话语体系的构建迫在眉睫。本文将试图从话语体系的本质特征的视角,来阐述中国式教育现代化话语体系的构建。话语体系的构建受制于历史,具有公共性,并在实践交往中形成。中国式教育现代化话语体系构建受到中国教育现代化历史的影响。它必须遵循一定的价值取向,促进人的主体自由,使人得到自由而全面的发展,体现教育实践的现实追求。据此,中国式教育现代化话语体系构建的策略为:关注时代之问;祛除西方中心论,批判借鉴西方话语;体现话语与实践的互动关系;处理好话语叙事与话语构建的互动关系。

关键词：中国式现代化教育现代化话语特征话语体系构建