检索结果-南通市图书馆

Attractors for discrete Nonlinear Schrdinger Equation with Delay

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2010年第4期26卷 633-642页

作者： Tao Chen Sheng-fan Zhou cai-di Zhao Admissions and Career Service Shanghai UniversityShanghai 200444China Department of Applied Mathematics Shanghai Normal UniversityShanghai 200234China Department of Mathematics and Information Science Wenzhou UniversityWenzhou 325035China

In this paper,we first prove the existence of the global attractor Aν ∈ C（[-ν,0],2）（ν 0） for a weak damping discrete nonlinear Schrdinger equation with *** we consider an upper semi-continuity of Aν as ν ... 详细信息

关键词： discrete Schrdinger equation delay global attractor upper semi-continuity

Asymptotic Smoothing Effect of Solutions to Davey-Stewartson Systems on the Whole Plane

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第11期23卷 2043-2060页

作者： cai di ZHAO Yong Sheng LI Sheng Fan ZHOU School of Mathematics and Information Science Wenzhou University Wenzhou 325035 P. R. China Department of Mathematical Sciences South China University of Technology Guangdong 510640 P. R. China Department of Applied Mathematics Shanghai Normal University Shanghai 200234 P. R. China

This paper discusses the Cauchy problem of elliptic-elliptic-type Davey-Stewartson systems with zero-order dissipation on R^2. Making use of the Fourier spectral projector, together with a long time comparison between the solutions to the Davey-Stewartson systems and to an auxiliary problem, we prove that the global attractor in H^1 （R^2） for the addressed Davey-Stewartson systems is a compact subset of H^2（R^2）, and thus reveal the asymptotic smoothing effect of the solutions for the systems.

关键词： Davey-Stewartson systems asymptotic smoothing effect global attractor zero-order dissipation

Precipitation and stability of reversed austenite in 9Ni steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2010年第5期17卷 587-595页

作者： Yue-hui Yang Qing-wu cai di Tang Hui-bin Wu Research Institute of Metallurgical Engineering University of Science and Technology Beijing Beijing 100083 China

A new method was used to analyze the factors affecting the precipitation of reversed austenite during tempering. The samples were kept at various tempering temperatures for 10 min and their length changes were recorded. Then, the precipitation of reversed austenite which led to the length reduction was shown by thermal expansion curves. The results show that the effects of process parameters on the precipitation of reversed austenite can be determined more accurately by this method than by X-ray diffraction. When the quenching and tempering process is adopted, both the lower quenching temperature and higher tempering temperature can promote the precipitation of reversed austenite during tempering; and when the quenching, lamellarizing, and tempering process is used, intercritical quenching is considered beneficial to the precipitation of reversed austenite in the subsequent tempering because of Ni segregation during holding at the intercritical temperature.

关键词： cryogenic equipment low carbon steel reversed austenite precipitation stability thermal expansion measurement

H_(3)PO_(4) activated biochars derived from different agricultural biomasses for the removal of ciprofloxacin from aqueous solution

在线全文

学校读者我要写书评

暂无评论

Particuology 2023年第4期75卷 217-227页

作者： Jinbo Ouyang Jian Chen Wenqian Chen Limin Zhou di cai Cong Ren Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang330013China Department of Pharmacy National University of Singapore117544Singapore National Energy Research and Development Center for Biorefinery Beijing University of Chemical TechnologyBeijing100029China

Biochars were prepared by the pyrolysis of various H_(3)PO_(4) activated agricultural biomasses at 600℃and subsequently used as adsorbents for the removal of ciprofloxacin(CIP)from aqueous *** shell-based biochar(PSBC),corncob-based biochar(CCBC)and cotton-based biochar(CTBC)had high surface areas(571.0-1006.3 m^(2)/g),well-developed pore structures(mesopores with large pore volumes)and available adsorption functional groups(C=C,C-N and C-O-C).The CIP adsorption onto the biochars was investigated by batch experiments(kinetics,isotherms,thermodynamics,pH,etc.).Thermodynamics calculations showed the spontaneous(ΔG^(θ)0)nature of the *** particular,CCBC exhibited high adsorption capacity(120.6 mg/g)of CIP in real lake water and it also had significant removal efficiency of other common pharmaceutical contaminants from real lake environ-ment,and even in a coexisting quintuple ***,multiple interaction mechanisms of CIP adsorption onto aromatized biochar were explored combining characterization analysis and theoretical *** of the mechanism of CIP adsorption onto biochar provides new insights into the assessment of the removal of pharmaceuticals from the aqueous environment.

关键词： Biochar Adsorption Pharmaceutical contaminants Ciprofloxacin Water remediation

Tribological behavior of magnetron sputtering CrMoN/MoS_2 composite coatings

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

Acta Metallurgica Sinica(English Letters) 2012年第6期25卷 461-468页

作者： Yuelan di Zhihai cai Ping ZHANG Zhen YANG Qi LI Wei SHEN Department of Equipment Remanufacturing Engineering Academy of Armored Forces Engineering Beijing100072 China

CrMoN composite coatings were deposited on the surface of the stainless steel by magnetron sputtering, then were treated by low temperature ion sulfuration. FESEM equipped with EDX was adopted to analyze the morphologies and compositions of the surface, cross-section and worn scar of the sulfuration layer. The valence states of the film surface were detected by XPS. The nano-hardness and nano-modulus of the layer were measured by a nano tester. The results of the friction and wear show that the CrMoN/MoS2 composite coating is a kind of ideal solid lubrication layer and possess an excellent antifriction and wear-resistance.

关键词： CrMoN/MoS2 Magnetron sputtering Low temperature ionsulfurizing Solid lubrication

Synthesis of micro/meso porous carbon for ultrahigh hydrogen adsorption using cross-linked polyaspartic acid

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2020年第5期14卷 857-867页

作者： Jun Wei Jianbo Zhao di cai Wenqiang Ren Hui Cao Tianwei Tan National Energy Research and Development Center for Biorefinery Beijing University of Chemical TechnologyBejing 100029China Engineering Laboratory of Chemical Resources Utilization in South Xinjiang of Xinjiang Production and Construction Corps College of Life SciencesTarim UniversityAlar 843300China Research Center for Eco-Environmental Sciences Chinese Academy of ScienceBejing 100085China

In addition to the specific surface area,surface topography and characteristics such as the pore size,pore size distribution,and micro/mesopores ratio are factors that determine the performance of porous carbons(PCs)in the fields of energy,catalysis,and *** on the mechanism of weight loss of polyaspartic acid at high temperatures,this study provided a new method for adjusting the surface morphology of PCs by changing the cross-linking ratio of the precursor,where cross-linked polyaspartic acid was used as precursor without additional activating agents.N2 adsorption analysis indicated that the specific surface area of the obtained PCs was as high as 1458 m2·g-1,of which I 200 m2·g-1was the contribution of the microporous area and the highest pore volume was 1.13 cm3·g-1,of which the micropore volume was 0.636cm3·*** thermogravimetric analysis results of the precursor,and also the scanning electron microscopy and Brunauer-Emmet-Teller analysis results of the carboniza-tion product confirmed that the prepared PCs presented multilevel pore structure,and the diameters of most pores were 0.78 and 3.97 nm;moreover,the pore size distribution was relatively *** conferred the PCs the ultrahigh hydrogen adsorption capacity of up to 4.52 wt-%at 77 K and 1.13 bar,in addition to their great energy storage and catalytic potental.

关键词： porous carbon multilevel pores polyaspartic acid cross-linking hydrogen adsorption

Identification of immune feature genes and intercellular profiles in diabetic cardiomyopathy

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

World Journal of diabetes 2024年第10期15卷 2093-2110页

作者： Ze-Qun Zheng di-Hui cai Yong-Fei Song Ningbo Institute of Innovation for Combined Medicine and Engineering The Affiliated Lihuili Hospital of Ningbo UniversityNingbo 315040Zhejiang ProvinceChina Department of Cardiology Clinical Research CenterShantou University Medical CollegeShantou 515041Guangdong ProvinceChina

BACKGROUND diabetic cardiomyopathy(DCM)is a multifaceted cardiovascular disorder in which immune dysregulation plays a pivotal *** immunological molecular mechanisms underlying DCM are poorly *** To examine the immunological molecular mechanisms of DCM and construct diagnostic and prognostic models of DCM based on immune feature genes(IFGs).METHODS Weighted gene co-expression network analysis along with machine learning methods were employed to pinpoint IFGs within bulk RNA sequencing(RNA-seq)***-sample gene set enrichment analysis(ssGSEA)facilitated the analysis of immune cell *** and prognostic models for these IFGs were developed and assessed in a validation *** expression in the DCM cell model was confirmed through real time-quantitative polymerase chain reaction and western blotting ***,single-cell RNA-seq data provided deeper insights into cellular profiles and *** The overlap between 69 differentially expressed genes in the DCM-associated module and 2483 immune genes yielded 7 differentially expressed immune-related *** IFGs showed good diagnostic and prognostic values in the validation cohort:Proenkephalin(Penk)and retinol binding protein 7(Rbp7),which were highly expressed,and glucagon receptor and inhibin subunit alpha,which were expressed at low levels in DCM patients(all area under the curves>0.9).SsGSEA revealed that IFG-related immune cell infiltration primarily involved type 2 T helper *** expression of Penk(Pdiomyocytes and interstitial cells and further confirmed in a DCM cell model in *** events and communication analysis revealed abnormal cellular phenotype transformation and signaling communication in DCM,especially between mesenchymal cells and *** The present study identified Penk and Rbp7 as potential DCM biomarkers,and aberrant mesenchymal-immune cell phenotyp

关键词： diabetic cardiomyopathy Immune feature genes Proenkephalin Retinol binding protein 7 Immune cell infiltration Intercellular communication

Recent advances of ferro-/piezoelectric polarization effect for dendrite-free metal anodes

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 2023年第8期42卷 2516-2544页

作者： Hai-Xia Zhang Peng-Fei Wang Chuan-Gang Yao Shi-Peng Chen Ke-di cai Fa-Nian Shi School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China School of Environmental and Chemical Engineering Shenyang University of TechnologyShenyang 110870China College of Chemistry and Materials Engineering Bohai UniversityJinzhou 121013China

Metal anodes based on plating/stripping electrochemistry,for instance,common alkaline metal lithium(Li),sodium(Na),potassium(K),polyvalent metal magnesium(Mg),aluminum(Al),calcium(Ca)and zinc(Zn)are imminently evoked and increasingly researched for future generation high-energy-density rechargeable batteries due to their large theoretical capacity,low electrochemical potential,and superior electronic conductivity in recent ***,the uncontrolled dendrite formation issue induces low Coulombic efficiency,short lifespan,and hazardous security risks,hindering the actual applications of metal *** various solutions,the utilization of ferro-/piezoelectric materials for metal anodes displays active effects on decreasing local current density,suppressing dendrite growth,and tolerating volume expansion benefits from the unique ferro-/piezoelectric polarization *** review presents the research progress of ferro-/piezoelectric polarization effect for regulating the dendritic growth of metal anodes for the first ***,the current challenges and strategies of metal anodes are ***,ferro-/piezoelectric materials and their working principle are ***,the recent research progress of ferroelectric and piezoelectric materials on dynamic regulation of dendrite growth is summarized,and the future perspectives are *** hope this review could draw more attention in designing metal anodes with self-polarization materials and promoting their practical applications.

关键词： Metal anode Ferro-/piezoelectric material Polarization effect Dendrite-free Lithium Perovskite

NaBH4-induced phase transition of CoSe_(2) with abundant Se deficiency for acidic oxygen reduction to hydrogen peroxide

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第2期43卷 500-510页

作者： cai-di Han Yong-Chao Zhang Qian Zhang Jin-Ting Wu Jian Gao Ji-Jun Zou Xiao-Dong Zhu State Key Laboratory Base of Eco-Chemical Engineering College of Chemical Engineering Qingdao University of Science and TechnologyQingdao266042China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China

Electrocatalytic oxygen reduction(ORR)via the 2e−pathway to form H_(2)O_(2) in acidic medium has attracted extensive ***,the low activity,insufficient selectivity and high cost of catalysts have been the ***,CoSe_(2) with abundant Se deficiency was synthesized by a simple hydrothermal method,and the addition of NaBH4-induced CoSe_(2) phase transition from orthorhombic to cubic phase with more Se *** cubic phase CoSe_(2) with abundant Se deficiency can effectively regulate the surface electronic structure with suitable binding energies of*OOH and*O,which shows high activity,selectivity and long-term stability for acidic ORR to H_(2)O_(2).The onset potential is as low as 0.73 V *** hydrogen electrode(RHE),the H_(2)O_(2) selectivity is 84%(0 V ***),and the average electron transfer number is about ***,the H_(2)O_(2) yield measured using a flow cell is as high as 115.92 mmol·gcat.^(−1)·h^(−1) and the Faradaic efficiency is 70%at 0 V ***,which presents high potential in electrocatalytic acidic ORR to H_(2)O_(2) and organic pollutant degradation using the electron-Fenton process.

关键词： Se defected CoSe_(2) Crystal phase transition Electrocatalysis Acidic oxygen reduction Hydrogen peroxide