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Wiedemann effect of Fe-Ga based magnetostrictive wires

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Chinese Physics B 2012年第8期21卷 476-481页

作者：李纪恒高学绪朱洁包小倩程亮谢建新 State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

（Fes3Ga17）98Cr2 wires each with a diameter of 0.7 mm are prepared by hot swaging and warm drawing from the casting rods directly, because the ductility of Fes3Ga17alloy is improved by adding Cr element. The Wiedemann twists and dependences on magnetostrictions of Fe83Ga17 and （Fe83Ga17）98Cr2 wires are investigated. The largest observed Wiedemann twists of 245 ***-1 and 182 ***-1 are detected in the annealed Fes3Ga17 and （Fe83Ga17）98Cr2 wires, respectively. The magnetostrictions of the annealed Fes3Ga17 and （Fes3Ga17）98Cr2 wires are 160 ppm and 107 ppm, respectively. The maximum of the Wiedemann twist increases with magnetostriction increasing. However the magnetostriction is just one important factor that affects the Wiedemann effect of alloy wire, and the relationship between magnetostriction and Wiedemann effect is a complex function rather than a simple function.

关键词： Fe-Ga alloy wires Wiedemann effect magnetostriction

Improvement of giant magneto impedance of Co-rich melt extraction wires by stress-current annealing

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Rare Metals 2011年第4期30卷 327-331页

作者： ZHANG Shuling SUN Jianfei XING Dawei School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan 030024 China

In order to improve the giant magneto impedance （GMI） of Co-rich wires for high sensitive sensor applications, ***5 wires were prepared by melt an extraction technique and subjected to Joule stress-current anneal treatments with different tensile slresses applied. And then their GMI response was investigated at a frequency range from 0.1 to 13 MHz. It was found through the comparison of results that the GMI effect of these wires had been improved through stress-current anneal treatments, because the tensile stress applied on these Co-rich wires introduced magnetoelastic energy and increased anisotropy, which improved the circular permeability and GMI effect. Their impedance ratio AZ/Z increased from 244% to 480.9% at 7 MHz and the field sensitivity increased to 0.83%/（A/m） at 5 MHz, when a tensile stress of 244 MPa was applied at an anneal current of 100 mA for 10 min. It was therefore concluded that these annealed wires were suitable for high sensitive sensor applications.

关键词： amorphous magnetic materials cobalt alloys wires giant magneto-impedance effect annealing

Preparation, microstructure and degradation performance of biomedical magnesium alloy fine wires

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Progress in Natural Science:Materials International 2014年第5期24卷 523-530页

作者： Jing Bai Lingling Yin Ye Lu Yiwei Gan Feng Xue Chenglin Chu Jingli Yan Kai Yan Xiaofeng Wan Zhejun Tang School of Materials Science and Engineering Southeast University Jiangsu Key Laboratory for Advanced Metallic Materials College of Mechanical Engineering Yangzhou University School of Mechanical Engineering Nantong University Mechanical and Electrical College Nanjing University of Aeronautics and Astronautics

With the development of new biodegradable Mg alloy implant devices, the potential applications of biomedical Mg alloy fine wires are realized and explored gradually. In this study, we prepared three kinds of Mg alloy fine wires containing 4 wt% RE(Gd/Y/Nd) and 0.4 wt% Zn with the diameter less than 0.4 μm through casting, hot extruding and multi-pass cold drawing combined with intermediated annealing process. Their microstructures, mechanical and degradation properties were investigated. In comparison with the corresponding as-extruded alloy, the final fine wire has significantly refined grain with an average size of 3–4 μm, and meanwhile shows higher yield strength but lower ductility at room temperature. The degradation tests results and surface morphologies observations indicate that Mg–4Gd–0.4Zn and Mg–4Nd–0.4Zn fine wires have similar good corrosion resistance and the uniform corrosion behavior in SBF solution. By contrast, Mg–4Y–0.4Zn fine wire shows a poor corrosion resistance and the pitting corrosion behavior.

关键词： Biomedical magnesium alloy wires Cold drawing Microstructure Degradation

Raman spectroscopy of single quantum well wires

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Chinese Science Bulletin 2000年第23期45卷 2138-2141页

作者： LI Leyu ZHANG Shulin LI Zhifeng LIU Xingquan LU Wei SHEN Xuechu Department of Physics Peking UniversityBeijing 100871China National Laboratory of Infrared Physics Chinese Academy of SciencesShanghai 200083China Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083China

We used the micro-Raman spectroscopy to investigate the V-grooved quantum well wires (QWWs), and first observed and assigned the Raman spectra of single QWW. They were the disorder induced modes at 223 and 243 cm-1, c... 详细信息

关键词： quantum well wires GaAs Raman spectroscopy.

Influence of wires Properties on Warp-Knitted Loop Geometry in Plane Based on Theory of Elastic Rod

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Journal of Donghua University(English Edition) 2016年第3期33卷 381-385页

作者：徐海燕蒋金华陈南梁 TSL School of Business and Information Technology Quanzhou Normal University College of Textiles Donghua University

Based on classic theory of elastic rod,the warp-knitted loop geometry in plane is independent of yarn properties,while there is a certain gap between the geometrical model and the actual *** to this problem,further analysis of loop geometry is done based on the theory of elastic rod with theoretical calculation and *** theoretical analysis found that the distance between the contacted points at the loop root affected the loop geometry,and the distance was affected by the ratio of bending rigidity and the friction between *** experiments,forming simple loop by taking the yarn as an elastic rod,found that the bending rigidity affected the loop *** the relationships between warp-knitted loop geometry in plane of metallic fabrics and wires properties were *** results show that metallic fabrics are more suitable for the theory of elastic rod;the friction and bending rigidity of wire yarns affect the loop geometry in ***,the elongation of yarn affects the loop geometry in the actual warp-knitted fabric.

关键词： theory of elastic rod warp-knitted fabric yarn properties wires loop geometry in plane

Cyanopolyynes as Organic Molecular wires in the Interstellar Medium

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International Journal of Astronomy and Astrophysics 2012年第4期2卷 230-235页

作者： Raul G. E. Morales Carlos Hernández Centre for Environmental Sciences and Department of Chemistry Faculty of Sciences Universidad de Chile Santiago Chile Department of Chemistry Faculty of Basic Sciences Universidad Metropolitana de Ciencias de la Educación Santiago Chile

Cyanopolyynes (H[C≡C]n-CN or HC2n+1N, where n = 1, 2, 3, …, n) are commonly observed in the interstellar medium (ISM) as well as in the envelopes of carbon-rich stars. These linear molecular structures can be well described with a one-dimensional conduction model, which considers the scattering processes of electrons through the charge transfer conduction bridge of the H[C≡C]n-molecular wire containing the CN group as an electron-acceptor terminal unit. Therefore, our results using this model enable a better understanding of the longest molecules observed in interstellar space and provide new insight into why these particular cyanopolyynes reach a maximum length, such as is observed from astronomical experimental spectral data and cosmological chemical models. Dipole moments and geometrical parameters of these cyanopolyynes were obtained from ab initio molecular orbital calculations using the restricted Hartree-Fock approach and 6-311G* basis set, in order to obtain the inner resistance as a new parameter of chemical reaction feasibility for this molecular series. Using this last molecular parameter, we have been able to analyze the possibility of identifying long molecular species that can be found under local thermodynamic equilibrium in some ISM such us HC25H, HC27H, and HC29N, which have not been observed at present.

关键词： Cyanopolyynes Structures Dipole Moments Inner Molecular Resistances Organic Molecular wires ISM Radial Column Density

Observation and Analysis of Meteorological Conditions for Icing of wires in Guizhou, China

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Journal of Geoscience and Environment Protection 2019年第9期7卷 214-230页

作者： Jifen Wen Ran Jia Yuxiang Peng Guizhou Provincial Office of Weather Modification Guiyang China Key Laboratory of Atmospheric Physics and Atmospheric Environment Nanjing University of Information Science & Technology Nanjing China

Icing of wires is a product of rain, fog, and freezing rain, and is a common meteorological disaster in winter in Guizhou Province of China. It is extremely harmful to facilities such as power transmission and communication lines, and has caused huge economic loss up to 48.9566 billion dollars a year. Based on the meteorological records of Guizhou from 1967, we analyze the meteorological characteristics during the icing of wires, and obtain the temperature, wind speed and direction conditions of the ice accident. The icing of wires is carried out by supercooling raindrops, freezing of the clouds, freezing and spreading on the wires. Different types of supercooled raindrops and cloud freezing and freezing processes will form different types of ice accretion;wind direction and wind speed will affect the growth of ice accretion by changing the speed of sub-cooling raindrops and cloud falling. The weight of rain-type ice accretion is between 24 and 152 g, and the weight of smog-type ice is between 40 - 76 g. The average ice density of these two places can be calculated to be 0.2 - 0.5 g/cm3. The longer the icing of wires, the higher the ice disaster rate.

关键词： Rain Smog Icing of wires Weather Conditions

Multicentre collaborative cohort study of the use of Kirschner wires for the management of supracondylar fractures in children

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Chinese Journal of Traumatology 2019年第5期22卷 249-254页

作者： Henry Claireaux Richard Goodall Joshua Hill Elizabeth Wilson Philippa Coull Sebastian Green James Schuster-Bruce Diana Lim Joanna Miles Payam Tarassoli University of Bristol Senate HouseTyndall AveBristolBS8 1THUK Bristol Royal Hospital for Children Maudlin StBristolBS2 8BJUK

Purpose:Supracondylar fractures of the humerus cause significant morbidity in *** damage and loss of fracture reduction are common recognised complications in patients with this *** surrounds the optimal Kirschner wire configuration and diameter for closed reduction and pinning of these *** study describes current practice and examined the association between wire configuration or diameter and outcomes(clinical and radiological)in the operative management of paediatric supracondylar ***:Children presenting w让h GartlandⅡorⅢsupracondylar fractures at five hospitals in southwest England were eligible for *** scrutinised paper and electronic case *** measures were maintenance of reduction and iatrogenic nerve ***:Altogether 209 patients were eligible for inclusion:15.7%had a documented neurological deficit at presentation;3.9%who were neurologically intact at presentation sustained a new deficit caused by treatment and 13.4%experienced a clinically significant loss of reduction following *** of reduction was significantly better in patients treated specifically with crossed×3 Kirschner wire configuration compared to all other *** incidence of iatrogenic nerve injury was not significantly different between groups treated with different wire ***:We present a large multicentre cohort study showing that crossed×3 Kirschner wires are associated with better maintenance of reduction than crossed×2 or lateral entry *** numbers would be required to properly investigate nerve injury relating to operative management of supracondylar *** found significant variations in practice and compliance w让h the British Orthopaedic Association Standard for Trauma(BOAST)11 guidelines.

关键词： Fracture fixation Humerus Child Nerve injury Bone wires

Ferromagnetism in Diluted Magnetic Semiconductor (Ga,Mn)As Quantum wires and Quantum Wells under the Influence of Photo-Excitation and Spin Wave Scattering

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Journal of Modern Physics 2013年第12期4卷 1563-1568页

作者： Chernet Amente Keya Dharamvir Physics Department Addis Ababa Science and Technology University Addis Ababa Ethiopia Physics Department Panjab University Chandigarh India

We present a theoretical investigation of the influence of photo-excitation and spin wave scattering on magnetization of the (Ga,Mn)As diluted magnetic semiconductor (DMS) quantum wires (QWRs) and quantum wells (QWs). Double time temperature dependent Green’s function formalism is used for the description of dispersion and spectral density of the systems. Our analysis indicates that spin wave scattering plays an influential role in magnetism of both systems while application of light is insignificant in quantum wells. In the absence of spin wave scattering and at sufficiently low temperatures, a result corresponding to the specific heat of dominating electronic contributions in metals is obtained in QWs. In QWRs, however, this magnetic property is found to vary with T1/2 and α2T1/2 so that light matter coupling has a leading effect on lower temperatures, where α is the light matter coupling factor and T is the temperature.

关键词： Heat Capacity Magnetization Photo-Excitation Quantum Wells Quantum wires Spin Wave Scattering