检索结果-南通市图书馆

Several Dynamics of Dynamical Systems with the Eventual Shadowing Property

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2023年第10期39卷 1907-1918页

作者： xue rong xie Jian Dong YIN Department of Mathematics Nanchang UniversityNanchang 330031P.R.China

In this article,we provide some sufficient conditions for the dynamical systems with the eventual shadowing property to have positive topological entropy and several equivalent conditions for the dynamical systems wit... 详细信息

关键词： Eventual shadowing property eventually shadowable point topological entropy mixing

我国地方品种萧山鸡白介素2基因的克隆和分子进化分析

在线全文

学校读者我要写书评

暂无评论

生物化学与生物物理学报 2001年第6期33卷 713-718页

作者：李建荣黄耀伟孟松树梁雪芽谢荣辉于涟浙江大学动物预防医学研究所浙江大学动物预防医学研究所杭州310029

鸡白介素细胞 2 (cIL 2 )是新近确定的非哺乳动物类细胞因子。建立了体外诱导鸡IL 2的最佳条件 ,从ConA激活的脾脏T淋巴细胞中克隆了我国地方品种鸡 (浙江萧山鸡 )IL 2cDNA。该基因全长 737bp ,编码 143个氨基酸的前体蛋白质。其编码序... 详细信息

鸡白介素细胞 2 (cIL 2 )是新近确定的非哺乳动物类细胞因子。建立了体外诱导鸡IL 2的最佳条件 ,从ConA激活的脾脏T淋巴细胞中克隆了我国地方品种鸡 (浙江萧山鸡 )IL 2cDNA。该基因全长 737bp ,编码 143个氨基酸的前体蛋白质。其编码序列与已公布的 3条鸡IL 2仅有 1～ 5个氨基酸的差异 ,与火鸡的IL 2同源性高达6 9.4% ,与其他哺乳动物IL 2的同源性在 2 1.2 %～ 2 9.4%之间。二级结构预测表明 ,N端存在一长 2 2个氨基酸的前导肽 ,4个半胱氨酸形成两个链内二硫键 ,并存在类似人IL 2的 4个α螺旋 ,这些结构在维持IL 2生物学活性中起到重要作用。另外D4 0 、Y65、E82 、N10 8和Q14 2 等氨基酸可能参与鸡IL 2受体的结合。分子系统进化树分析表明 ,鸡IL 2和哺乳动物IL 2有着共同的祖先 ;在免疫系统选择性压力下 ,形成独特的种族特异性。

关键词：鸡白细胞介素2 克隆序列分析分子进化

Turbulent Agglomeration of Microparticles in a Cylinder Wake Flow Using LES-DEM:Focusing on the Effect of the Reynolds Number

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2025年第1期 34-49页

作者： WANG Shuang MU Lin LI xue xie Jun DONG Ming School of Energy and Power Engineering Dalian University of Technology School of Optical Information and Energy Engineering Wuhan Institute of Technology School of Energy and Environment Shenyang Aerospace University

Turbulent agglomeration is viewed as a promising technology for enhancing fine particle removal *** better understand particle transport,agglomeration behaviors,and fluid-particle interactions,we numerically explored these phenomena under cylindrical vortex wake influence using a coupled large eddy simulation and discrete element method（LES-DEM） *** validity of the LES approach was verified by comparison with available direct numerical simulation（DNS） *** adopted the Johnson-Kendall-Roberts（JKR） contact model for particle-particle *** particle dispersion and agglomeration characteristics of particles with different diameters（dp=2-20 μm） in the laminar and transition of shear layer（TrSL） flow regimes were *** particles were concentrated at the vortex centers,while larger particles accumulated around the *** agglomeration efficiency exhibited an M-shaped profile spanwise（y-direction）.With increasing Reynolds number,the agglomeration efficiency and turbulence intensity *** particle agglomeration efficiency peaks at a certain Reynolds ***,at higher Reynolds numbers,reducing the residence time of particles in the flow field decreases the agglomeration efficiency.

关键词：

Effects of Ti-and Nb-based transition element from single to multiple compound oxides and carbon-based composite additives on Mg-MgH2 hydrogen storage material

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Tungsten 2025年第1期 32-49页

作者： Li-rong Xiao Chen Chen Shuo Wang Zi-Yin Dai Hideo Kimura Cui Ni Chuan-Xin Hou xue-Qin Sun Si-Jie Guo Wei Du Xiu-Bo xie School of Environmental and Material Engineering Yantai University Bosch HUAYU Steering Systems (Yantai) Co. Ltd.Ytp/MFE University of Tennessee Knoxville Shandong Key Laboratory of Eco-Environmental Science for the Yellow River Delta Shandong University of Aeronautics

MgH2is considered as a promising hydrogen storage material for its high hydrogen storage capacity,low cost and abundant resource ***,the low kinetics and high enthalpy formation of MgH2limit its wide *** the perspective of adding catalysts to enhance the hydrogen storage properties of Mg-MgH2,this article elaborated the main catalysts based on Ti and Nb transition elements,including single oxide catalysts,binary oxides catalysts（combined with Ni,Na,Sr,V,etc.）,multiple catalysts bound to carbon,and composite catalysts with Ti and Nb elements combined with MXene ***,the main pathways of various catalysts to reduce the reaction activity and broaden the hydrogen desorption channel were also *** Ti-based catalysts can enhance the reactive sites of the matrix by forming multivalent states,while Nb-based catalysts broaden the hydrogen reaction channels by forming tiny *** improving the size structure and enhancing the grain size stability,combined with carbon materials should be the future considerations.

关键词：

Super Tough Hydrogels with Self-adaptive Network Facilitated by Liquid Metal

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 Journal of Polymer Science 2023年第6期41卷 866-873,I0006页

作者： rong-Ze Gao Yu-Xi Li Jian-Hui Yan xue-Rui Ma Xu-Ming xie Key Laboratory of Advanced Materials(MOE) Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Liquid metals(LM)refer to Ga-based alloys with low melting points such as Eutectic GaInSn alloys(EGaInSn),which have excellent fluidity,flexibility and low toxicity at room *** this work,by incorporating EGaInSn into poly(acrylic acid)(PAA)hydrogels as dynamic crosslinkers and effective energy-dissipating units,tough and strong PAA-LM hydrogels are prepared through the interactions between the oxide layers on the surface of LM and carboxyl groups of PAA ***,owing to the fluidity of LM,one LM droplet as a cross-linking point may change its shape or break into more and smaller droplets in the hydrogels upon *** hydrogels with self-adaptive networks can be fabricated by mechanical training through cyclic stretch at a certain ***,the networks of the hydrogels are further homogenized,and the hydrogels are significantly toughened during the training due to the increased cross-linking density from the larger number of smaller LM *** a 5-cycle training at the maximum strain of 500%and 24 h recovering,the tensile strength and initial modulus of the PAA-LM hydrogels can be increased from 355 kPa to 597 kPa and 71 kPa to 166 kPa,respectively,while the elongation at break only decreases from 1491%to 1034%.

关键词： temperature. linking stretching

Recent progress on discovery of novel phosphors for solid state lighting

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2020年第5期38卷 464-473页

作者： xuefang Luo rong-Jun xie College of Materials Xiamen UniversityXiamen 361005China

Luminescent materials play indispensable roles in many application areas such as lighting,advanced displays,bio-imaging,medical treatments,sensing and *** new luminescent materials with improved or desired properties is an endless mission,driven by increasing demands of advances in technologies and *** traditional trial-and-error method,usually based on intensive experiments,cannot search for new materials in a fast and efficient way,therefore alternative model-or theory-based approaches for materials discovery need to be *** this work we overviewed several promising methods for screening and discovering novel luminescent materials,including solid state combinatorial chemistry,chemical unit substitution,single particle diagnosis and high-throughput *** methods,having their own merits and demerits,enable to search for new phosphor materials with interesting properties for white light-emitting diodes(wLEDs)rapidly and ***,data-driven discovery of materials is emphasized as a state-of-art approach.

关键词： Phosphor Solid-state lighting High throughput calculations Photoluminescence Combinatorial chemistry Single crystal

Light-emitting diodes:brighter NIR-emitting phosphor making light sources smarter

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2020年第1期9卷 539-540页

作者： rong-Jun xie College of Materials Xiamen UniversityXiamen361005 FujianChina

A brighter near-infrared(NIR)phosphor is achieved by inhibiting the oxidation of Cr3+and reducing the surface defects of phosphor particles,enabling the realization of smarter and more sensitive light sources for nigh... 详细信息

关键词： realization light smart

Extend ethylene aromatization single-event kinetic modeling with physical and chemical descriptor based on ZSM-5 catalyst

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

Petroleum Science 2023年第6期20卷 3841-3853页

作者： Jia-rong xie Fang Jin School of Chemical Engineering and Pharmacy Wuhan Institute of TechnologyWuhan430205HubeiChina Key Laboratory for Green Chemical Process of Ministry of Education Wuhan Institute of TechnologyWuhan430205HubeiChina Novel Reactor&Green Chemical Technology Key Laboratory Wuhan Institute of TechnologyWuhan430205HubeiChina

The ethylene aromatization is critical for the methanol to aromatics and light alkane dehydroaromatization *** single-event microkinetic(SEMK)model combining the linear free energy theory and solid acid distribution concept were established and extend for the ethylene aromatization process,which can reduce the kinetic parameters and simplify the reaction network by comparison with the SEMK model including subtype elementary steps based on the type of carbenium *** introducing deactivation parametersφinto the model and applying the linear free energy model to the deactivation experimental data,the obtained deactivation parametersφindicate that the carbon deposition precursors have the greatest impact on reducing the reaction rate of single-molecular reactions and the smallest impact on the hydrogen transfer ***,according to the change of reaction enthalpy,effect of carbenium ion structure on methylation,ethylation,cyclization and endo-βscission was investigated by introducing linear free energy concept into the SEMK *** effect of different acid strengths on elementary steps was investigated based on the acid strength distribution model,it was found that the methylation and oligomerization reactions,the ali-βscission reaction,endo-βscission reaction and the cyclization reaction were more sensitive to strong acidity *** physisorption and chemisorption heat are separated from the protonation heat in the linear free energy kinetic model and the acid strength distribution kinetic model,and the absolute values of the obtained physisorption and chemisorption heat increase with the carbon number of carbenium ***,the parameters of the acid strength distribution kinetic model were applied to propane dehydroaromatization on H-ZSM-5 and the ethane dehydroaromatization on Zn/ZSM-5 to confirm the independence of parameters in the SEMK model with the similar reaction network.

关键词： Kinetic model Ethylene aromatization Acid strength distribution Linear free energy theory

A novel multistage anoxic/aerobic process with sludge regeneration zone (R-MAO) for advanced nitrogen removal from domestic sewage

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第2期124卷 758-768页

作者： Lin Cao rong Sun Wenyi Dong Hongjie Wang Zhongyi Dai xue Wang Jin xie Hua Li School of Chemical Engineering Huaqiao UniversityXiamen 361021China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of TechnologyHarbin 150090China School of Civil and Environmental Engineering Harbin Institute of Technology ShenzhenShenzhen 518055China Central and Southern China Municipal Engineering Design&Research Institute Co. Ltd.Wuhan 430010China Shenzhen Water Group Co. Ltd.Shenzhen 518000China

To achieve advanced nitrogen removal from actual municipal sewage,a novel multistage anoxic/aerobic process with sludge regeneration zone(R-MAO)was *** reactor was used to treat actual domestic sewage and the nitrogen removal capacity of the sludge regeneration zone(R zone)was investigated during the long-term *** best performance was obtained at the R zone’s Oxidation-Reduction Potential(ORP)of-50±30 mV and hydraulic residence times(HRT)of 1.2 *** average effluent COD,TN,NH_(4)^(+)-N and NO_(3)^(−)-N of the R-MAO process were 18.0±2.3,7.5±0.6,1.0±0.5 and 4.6±0.4 mg/L,respectively,with the corresponding removal efficiency of COD,TN and NH_(4)^(+)-N were 92.9%±1.0%,84.1%±1.5% and 97.5%±1.1%.Compared to the sole MAO system,the TN removal efficiency of the R-MAO increased by 10.1%.Besides,under the optimal conditions,the contribution of the R zone in the R-MAO that removal COD,TN,NH_(4)^(+)-N and NO_(3)^(−)-N were 0.36,0.15,0.032 and 0.82 g/***-throughput sequencing results showed that uncultured_bacterium_f_Burkholderiaceae(5.20%),OLB8(1.04%)and Ottowia(1.03%)played an important role in denitrification in the R *** study provided effective guidance for the design and operation of the R-MAO process in domestic sewage treatment.

关键词： Advanced nitrogen removal Multistage anoxic/aerobic process Sludge regeneration zone(R zone) Microbial community