检索结果-南通市图书馆

Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 158-168页

作者： wen-tian Lu Zhe Yuan Xiaohong Xu Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education School of Chemistry and Materials ScienceShanxi Normal UniversityTaiyuan 030032China Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China

A systematic investigation of spin injection behavior in Au/FM(FM=Fe and Ni)multilayers is performed using the superdiffusive spin transport *** exciting the nonmagnetic layer,the laser-induced hot electrons may transfer spin angular momentum into the adjacent ferromagnetic(FM)metals resulting in ultrafast demagnetization or *** find that these experimental phenomena sensitively depend on the particular interface reflectivity of hot electrons and may reconcile the different observations in the *** by the ultrafast spin currents carried by the hot electrons,we propose the multilayer structures to generate highly spin-polarized currents for the development of future ultrafast spintronics *** spin polarization of the electric currents carried by the hot electrons can be significantly enhanced by the joint effects of bulk and interfacial spin ***,the intensity of the generated spin current can be optimized by varying the number of repeated stacking units and the thickness of each metallic layer.

关键词： spintronics ultrafast magnetodynamics spin polarization transport magnetic multilayer

Advances in the Development of Gradient Scaffolds Made of Nano-Micromaterials for Musculoskeletal Tissue Regeneration

在线全文

学校读者我要写书评

暂无评论

NANO-MICRO LETTERS 2025年第1期17卷 1-46页

作者： Fang, Lei Lin, Xiaoqi Xu, Ruian Liu, Lu Zhang, Yu tian, Feng Li, Jiao Jiao Xue, Jiajia Beijing Univ Chem Technol Beijing Lab Biomed Mat Beijing 100029 Peoples R China Beijing Univ Chem Technol State Key Lab Organ Inorgan Composites Beijing 100029 Peoples R China Univ Technol Sydney Fac Engn & IT Sch Biomed Engn Sydney NSW 2007 Australia

This review highlights the gradient variations in the structural composition of musculoskeletal tissues and comprehensively examines recent progress in the fabrication and application of biomimetic gradient scaffolds for musculoskeletal *** challenges and prospects of gradient scaffolds for clinical application are discussed. The intricate hierarchical structure of musculoskeletal tissues, including bone and interface tissues, necessitates the use of complex scaffold designs and material structures to serve as tissue-engineered substitutes. This has led to growing interest in the development of gradient bone scaffolds with hierarchical structures mimicking the extracellular matrix of native tissues to achieve improved therapeutic outcomes. Building on the anatomical characteristics of bone and interfacial tissues, this review provides a summary of current strategies used to design and fabricate biomimetic gradient scaffolds for repairing musculoskeletal tissues, specifically focusing on methods used to construct compositional and structural gradients within the scaffolds. The latest applications of gradient scaffolds for the regeneration of bone, osteochondral, and tendon-to-bone interfaces are presented. Furthermore, the current progress of testing gradient scaffolds in physiologically relevant animal models of skeletal repair is discussed, as well as the challenges and prospects of moving these scaffolds into clinical application for treating musculoskeletal injuries.

关键词： Gradient scaffolds Musculoskeletal tissues Advanced manufacturing Biomaterials Tissue regeneration

Construction of Two Coordination Polymers Based on Two New 5-Substitued Tetrazole-based Ligands: Structures and Luminescent Properties

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 Structural Chemistry 2019年第2期38卷 308-316,169页

作者： LI tian-tian ZHENG sheng-Run Guiyang College of Traditional Chinese Medicine Institute of Special Materials & School of Chemistry and Environment South China Normal University

Two new coordination polymers(CPs) based on two new tetrazole-based ligands, namely, [Cu(TPP)]n(HTTP = 4-(3-(2 H-tetrazol-5-yl)phenyl)pyridine, 1) and {[Cd_2(TBCA)_2(H_2O)_2]·-H_2O}n(H_2TBCA = 3?-(2 H-tetrazol-5-yl)biphenyl-4-carboxylic acid, 2), were synthesized via solvothermal reactions. Single-crystal X-ray diffraction analysis reveals that compound 1 exhibits a(3,6)-connected rtl network topology based on binuclear secondary building units(SBUs). Compound 2 presents a 2D framework composed of 1D SUBs formed by both carboxyl and tetrazole groups. The 2D network is linked into a 3D framework via various hydrogen bonds. They represent two examples of CPs construct from rigid 5-substitued tetrazole-based ligands with relatively longer spacer. The thermal stabilities and luminescent properties of compounds 1 and 2 were also explored.

关键词： tetrazole-based ligand coordination polymer crystal structure solid-state luminescence

Theoretical Study of Haloacetonitrile Anions： CH2XCN^- （X=F, Cl）

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第3期21卷 255-262页

作者： Xin-wen Zhang Mei Li Shan-xi tian Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technologyof China Hefei 230025 China Department of Chemical Physics University of Science and Technology of China Hefei 230026China

Haloacetonitrile anions CH2XCN- （X=F, Cl） were studied by HF-SCF, Becke3-LYP, and MP2 methods together with the Dunning＇s basis set aug-cc-PVTZ. The vertical electron attachments to the neutral are endothermic. The geometrically optimized CH2FCN^- is mainly a valence-bounded anion and CH2FCN→CH2CN＋F^- is a nonadiabatic dissociation. This theoretical study in good agreement with the experimental results shows that the Becke3-LYP method is reasonable in describing the electronic structures of anions and dissociative attachment dynamics, while significant differences between MP2 and Becke3-LYP results are shown for the dissociation potential curves of CH2ClCN→CH2CN＋Cl^-.

关键词： Haloacetonitrile Electron attachment Dissociation dynamics Electron correlation effect

Multiplicity of Positive Solutions to M-point Boundary Value Problem of Second Order Impulsive Differential Equations

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 Mathematicae Applicatae Sinica 2010年第1期26卷 145-158页

作者： Yuan-sheng tian Chun-gen Liu Department of Mathematics Xiangnan University Chenzhou 423000 China School of Mathematics and LPMC Nankai University Tianjin 300071 China

In this paper, by using Avery-Peterson theorem on a convex cone, we consider the m-point boundary value problems for second order impulsive differential equations with the nonlinear term depending on the first order d... 详细信息

关键词： Boundary value problem impulsive differential equations fixed-point theorem positive solutions

ADHESIVE CONTACT PROBLEM OF AXISYMMETRIC MINIATURE CIRCULAR PLATES WITH CENTRAL RIGID BUMP

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2006年第4期19卷 341-351页

作者： Fu Yiming Li sheng tian Yanping Department of Engineering Mechanics Hunan University Changsha 410082 China

Considering the adhesive effect and geometric nonlinearity, the adhesive contact between an elastic substrate and a clamped miniature circular plate with two different central rigid bumps under the action of uniform transverse pressure and in-plane tensile force in the radial direction was analyzed. And an analytical solution is presented by using the perturbation method. The relation of surface adhesive energies with critical load to detach the contacted surfaces is obtained. In the numerical results, the effects of adhesive energy, in-plane tensile force, rigid bump size and contact radius on the critical load are discussed, and the relation of critical contact radius with the gap between the central rigid bump and the substrate for different adhesive energies is investigated.

关键词： miniature hesive contact geometric circular plate two different central rigid bumps elastic substrate adnonlinearity

Flag-transitive point-primitive 2-(v,k,4) symmetric designs and two dimensional classical groups

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2011年第3期26卷 334-341页

作者： ZHOU sheng-lin tian De-lu Department of Mathematics South China University of Technology Guangzhou 510640 China

Let D be a 2-（v, k, 4） symmetric design and G be a flag-transitive point-primitive automorphism group of D with X ≥G ≤Aut（X） where X ≌ PSL2（q）.Then D is a 2-（15,8,4） symmetric design with X = PSL2（9） and ... 详细信息

关键词： Symmetric design flag-transitive point-primitive two dimensional classical group.

Radio Spectra of Three Supernova Remnants: G114.3+0.3, G116.5+1.1 and G116.9+0.2

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2006年第5期6卷 543-550页

作者： wen-Wu tian Denis Leahy National Astronomical Observatories Chinese Academy of Sciences Beijing 1000121 Department of Physics ＆ Astronomy University of Calgary Calgary Alberta T2N 1N4 Canada

Presented are new images of supernova remnants G114.3±0.3, G116.5＋1.1 and G116.9＋0.2 （CTB 1） at 408 MHz from the Canadian Galactic Plane Survey （CGPS）. We also use the 1420 MHz images from the CGPS in a study of their 408-1420 MHz spectral indices. The flux densities at 408 MHz and 1420 MHz, corrected for flux densities from compact sources within the SNRs, are 12±6 Jy and 9.8±0.8 Jy for G114.3＋0.3, 15.0±1.5 Jy and 10.6±0.6 Jy for G116.5＋1.1, 15.0＋1.5 Jy and 8.1±0.4 Jy for Gl16.9＋0.2. The integrated flux density-based spectral indices （Sv∝v^-α） are α=0.16±0.41, 0.28±0.09 and 0.49±0.09 for G114.3＋0.3, G116.5＋1.1 and G116.9＋0.2, respectively. Their T-T plot-based spectral indices are 0.68±0.48, 0.28±0.15, and 0.48±0.04, in agreement with the integrated flux density-based spectral indices. New flux densities are derived at 2695 MHz which are significantly larger than previous values. The new 408, 1420 and 2695 MHz flux densities and published values at other frequencies, where images are not available, are fitted after correcting for contributions from compact sources, to derive their multi-frequency spectral indices.

关键词： ISM individual G 114.3+0.3, G116.5+1.1,G 116.9+0.2- radio continuum ISM

An efficient method of addressing ectopic beats:new insight into data preprocessing of heart rate variability analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第12期12卷 976-982页

作者： Feng wen Fang-tian HE College of Life Science Zhejiang University Hangzhou 310027 China ECG Department Sir Run Run Shaw Hospital School of Medicine Zhejiang University Hangzhou 310016 China

Heart rate variability(HRV) analysis is affected by ectopic *** efficient method was proposed to deal with the ectopic *** method was based on trend correlation of the heart timing *** of R-R interval(RRI) value at ectopic beat time was constructed by the weight calculation and the slope estimation of preceding normal *** type of ectopic beat was detected and replaced by the predictor of *** performance of the simulated signal after ectopic correction was tested by the standard value using power spectrum density(PSD) estimation,whereas the results of clinical data with ectopic beats were compared with the adjacent ectopic-free *** result showed the frequency indexes after ectopy corrected had less error than other methods with the test of simulated signal and clinical *** indicated our method could improve the PSD estimation in HRV *** method had advantages of high accuracy and real time properties to recover the sinus node modulation.

关键词： Frequency domain Ectopic beat Heart rate variability(HRV) Power spectrum density

Effect of cooling method on TiN precipitation behavior of high-titanium high-strength steel during solidification

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第7期31卷 1692-1703页

作者： Xue-jian Zhang Guang-wei Yang Yong Wan Yong-hong wen Chuan-sheng Tang Ming-qi Liu Li-jie tian Key Laboratory of Metallurgical Emission Reduction and Resources Recycling Anhui University of TechnologyMa'anshan 243002AnhuiChina School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina Baosteel Central Research Institute Baoshan Iron and Steel Co.Ltd.Shanghai 201999China

Metallographic microscopy,scanning electron microscopy and TiN growth thermodynamic and kinetic equations were used to investigate the morphology,quantity,and size of TiN in the center of high-titanium high-strength steels under different solidification cooling *** results showed that TiN in the center of the experimental steels mainly existed in three forms:single,composite(Al2O3-TiN),and multi-particle *** began precipitating at around 1497℃(solidification fraction of 0.74).From the end of melting to solidification for 180 s,the cooling rates in the center of the experimental steels for furnace cooling,air cooling,refractory mold cooling,and cast iron mold cooling tended to stabilize at 0.17,0.93,1.65,and 2.15℃/s,*** size of TiN in the center of the experimental steel cooled using furnace cooling was mainly concentrated in the 5-15 pm *** contrast,the size of TiN in the center of the experimental steels cooled using air cooling,refractory mold cooling,and cast iron mold cooling were mainly concentrated in the 1-5 pm *** addition,their density of TiN in the center of the experimental steels is signif-icantly higher than that of the furnace-cooled experimental *** and kinetic precipitation models of TiN established predicted the growth size of TiN in a high-titanium high-strength steel when the solidification cooling rates are not below 0.93℃/s.

关键词： High-titanium steel Cooling method TiN Thermodynamics Kinetics