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Coercivity mechanisms in nanostructured permanent magnets

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Chinese Physics B 2019年第7期28卷 1-13页

作者： G P Zhao L Zhao L C Shen j zou L Qiu College of Physics and Electronic Engineering & Institute of Solid State Physics Sichuan Normal UniversityChengdu 610066 China State Key Luboratory of Metastablc Materials Science and Technology Yunshnn University.Qinhuangdao 066004China Collaborative Innovation Center for Shunxi Advanced Permanent Materials and Technology Lint'en 041004 China

Coercivity mechanism in permanent magnets has been debated for many *** this paper, various models of the coercivity mechanism are classified and re-examined by the comparison and *** rotation and curling models can reveal the underlying reversal mechanism clearly based on isolated grains with elliptic *** contrast, the numerical methods consider inter-grain interactions while simulating the evolution of the spins and hysteresis loops with complicated ***, an exact simulation of magnetic reversal in permanent nanomagnets requires many meshes to mimic the thin domain wall *** and pinning are the two main coercivity mechanisms in permanent *** former signifies the beginning of the magnetic reversal, whilst the latter completes ***, it is proposed that the large difference between the intrinsic magnetic properties of the nucleation centers and those of the main phase can result in a large pinning field(self-pinning), which has the attributes of both traditional nucleation and *** a pinning explains the experimental data of permanent magnets very well, including the enhancement of the coercivity by the grain boundary pinning.

关键词： coercivity mechanism permanent nanomagnets self-pinning

Cadmium sulfide cage photocatalysis coupled electroactive biofilm for synergistic promotion of tetracycline degradation and electricity production

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journal of Materials Science & Technology 2023年第35期166卷 86-97页

作者： Z.S.Yuan j.X.zou X.L.Zhao j.Y.Shi C.S.Guo M.Yan School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China

Tetracycline(TC)as a common broad-spectrum antibiotic,has been frequently detected in soil and sur-face *** becomes a great threat to the ecological ***,a device of photocatalysis as-sisted microbial fuel cell(photo-MFC)was constructed for TC degradation and energy *** this photo-MFC,cadmium sulfide(CdS)cage photocatalysis can degrade most of TC in a short *** the Co_(3)O_(4)@C-CC(carbonization and calcination of the ZIF-67 precursor in-situ grown on the carbon cloth(CC))bioanode degrades the rest of TC as well as the photocatalytic products,thus improving the *** co-existence of photocatalysis with bioanode changes the microbial community structure of the *** dominant phylum is Geobacter(60.2%)in normal MFC while that in photo-MFC are Pro-teobacteria(43.5%)and Geobacter(33.2%).Therefore,the synergistic effect of photocatalytic degradation and biodegradation achieves a chemical oxygen demand(COD)removal of 98.6%,which is higher than that of normal MFC(77.6%)or single CdS cage photocatalysis(23.8%).In addition,the photogenerated electrons can be transferred to the cathode,which reduces their combination with holes and increases the electricity generation of MFC,achieving a maximum power density of 3.37 W/m^(2).After degradation,the effluent with 200 mg L^(−1) TC exhibits no visible ***,electrochemical test,finite-difference time-domain(FDTD),density functional theory(DFT)calculation and the free radical trapping experiments verify the possible mechanisms of photocatalytic degradation in this *** strat-egy paves a new way for low energy consumption removal and energy recovery of organic pollutants.

关键词： Photo-MFC CdS cage Tetracycline degradation Mineralization Electricity production

ALLOYING EFFECT OF Ni AND Cr ON THE WETTABILITY OF COPPER ON W SUBSTRATE

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Acta Metallurgica Sinica(English Letters) 2008年第5期21卷 369-379页

作者： X.H. Yang P. Xiao S.H. Liang j.T. zou Z.K. Fan Shaanxi Key Laboratory for Electrical Materials and Infiltration Technology School of Materials Science and Engineering Xi＇an University of Technology Xi＇an 710048 China

By the sessile drop technique, the wettability of Cu/W systems with the additions of Ni and Cr has been studied under vacuum atmosphere. Effects of Ni and Cr contents and wetting temperatures on the wettability and the wetting mechanisms of copper on W substrate have been investigated in detail. The results show that the wetting angles of Cu on the W substrate are decreased with an increase in the content of Ni or Cr, and also decrease with raising the wetting temperatures. SEM, EPMA, and X-ray diffraction have been used to analyze the interracial characteristics of the CuNi/W and CuCr/W systems. The results reveal that there is a transition layer about 2- 3μm in the interface of Cu-4.0 wt pct Ni/W, in which the interrnetallic phase Ni4W is precipitated. As to CuCr/W system, no reaction occurs at the interface. The two factors are that the contents of Cr and Ni and the infiltration temperature must be chosen appropriately in order to control the interfacial dissolution and reaction when the Cu- W alloys are prepared by the infiltration method.

关键词： Wettability Contact angles Cu, Cr, Ni W substrate

城市和郊区复杂下垫面地气交换湍流通量的观测研究

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中国科学：地球科学 2021年第11期51卷 1964-1977页

作者：沙杰邹钧孙鉴泞南京大学大气科学学院南京210023 教育部大气与地球系统国际联合实验室南京210023 江苏省气候变化协同创新中心南京210023

文章利用南京和苏州市区观测站处于冠层之上粗糙子层当中的两个高度的观测资料以及郊区南京大学仙林校区SORPES观测站三个高度的观测资料,研究了复杂下垫面地气交换湍流通量及地表能量平衡关系的代表性问题.分析结果表明:在冠层之上的... 详细信息

文章利用南京和苏州市区观测站处于冠层之上粗糙子层当中的两个高度的观测资料以及郊区南京大学仙林校区SORPES观测站三个高度的观测资料,研究了复杂下垫面地气交换湍流通量及地表能量平衡关系的代表性问题.分析结果表明:在冠层之上的粗糙子层当中,城市下垫面的近地面动量通量、感热通量和潜热通量都随高度增加,城市下垫面地表反照率的观测值随高度增加,地表净辐射的观测值随高度减小,造成城市地表能量平衡的收支关系随高度变化;在地处丘陵地带的南京大学仙林校区SORPES观测站,地面观测场的动量通量、感热通量和潜热通量观测值与铁塔上两个高度的观测值存在明显差异,而铁塔上两个高度的观测值很接近.这些结果意味着在复杂下垫面之上实施通量观测需要在较高的离地高度上进行,其观测结果才具有较为充分的局地代表性;在城市地区较低高度上的湍流通量观测结果会出现偏低估计,而在丘陵复杂下垫面环境下靠近地表的湍流通量观测结果会出现较大偏差.

关键词：复杂下垫面地气交换湍流通量观测高度局地代表性

Cobalt Nickel Sulfides-Based Nanostructures in Energy Storage Applications

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Local Orientation Field Based Nonlocal Means Method for Fingerprint Image De-Noising

第二届海峡两岸功能材料科技与产业峰会（2015）

作者： R.j.zou Z.Y.Zhang M.F.Yuen W.j.Zhang Center of Super-Diamond and Advanced Films (COSDAF) Department of Physics and Materials ScienceCity University of Hong Kong State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University

With the rapid development of portable devices,green energy harvesting,and electric automobiles,safe energy storage devices with improved power and energy densities are becoming increasingly *** and Li-ion Batteries are very promising energy conversion and storage ***,the ternary cobalt nickel sulfides(Ni Co2S4)have drawn great research interest because of their intriguing advantages over the binary metal oxides

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journal of Signal and Information Processing 2013年第3期4卷 150-153页

作者： j. zou j. B. Feng X. M. Zhang M. Y. Ding School of Life Science and Technology Huazhong University of Science and Technology Wuhan China.

The de-noising of the fingerprint image is one of the key tasks before the extraction of the minutiae in automatic fingerprint matching. When used for de-noising the fingerprint image, the nonlocal means method can not preserve the local minutiae in the fingerprint image very well. To address this problem, we propose a local orientation field based nonlocal means (NLM-LOF) method in this paper. Experimental results on the simulated and real images show that the proposed method can suppress noise effectively while preserving edges and details in the fingerprint image and it outperforms the state-of-art nonlocal means method in terms of qualitative metrics and visual comparisons.

关键词： Fingerprint Image Denoising Nonlocal Means Filtering Orientation Field

The Apollon 10 PW laser: experimental and theoretical investigation of the temporal characteristics

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High Power Laser Science and Engineering 2016年第3期4卷 127-133页

作者： D.N.Papadopoulos j.P.zou C.Le Blanc G.Chriaux P.Georges F.Druon G.Mennerat P.Ramirez L.Martin A.Frneaux A.Beluze N.Lebas P.Monot F.Mathieu P.Audebert Laboratoire pour l'Utilisation des Lasers Intenses CNRSEcole Polytechnique Laboratoire Charles Fabry UMR 8501 Institut d'OptiqueCNRS Univ Paris Sud CEA Iramis SPAM

The objective of the Apollon 10 PW project is the generation of 10 PW peak power pulses of 15 fs at 1 shot min^(-1). In this paper a brief update on the current status of the Apollon project is presented, followed by a more detailed presentation of our experimental and theoretical investigations of the temporal characteristics of the laser. More specifically the design considerations as well as the technological and physical limitations to achieve the intended pulse duration and contrast are discussed.

关键词： high intensity lasers spatiotemporal effects ultrafast lasers

Misfit Dislocations in Strained-layer Semiconductor Heterostructures

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Misfit Dislocations in Strained-layer Semiconductor Heterost...

COMPUTED TOMOGRAPHY OF PAROTID MASSES

1996年中国青年学者物理学讨论会

作者： j.zou(Electron Microscope Unit & Australian Key Centre for Microscopy and Mieroanalysis The University of Sydney,NSW 2006,Australia)

＜正＞Strained-layer semiconductor heterostructures play a very important role in electronic and optoelectronie devices,because the electronic properties differ from those of single semiconductor materials and of latt...

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中华医学杂志(英文版) 1989年第4期102卷 250-250页

作者： G Y Yu Z j zou Y S Wang Beijing Medical University Beijing

Fifty-six patients with parotid masses, benign tumors in 22, malignant tumors 26 and other diseases 8, were examined by CT scan, which can differentiate intrinsic from extrinsic parotid lesions, especially deep lobe from parapharyngeal tumors and typical benign tumors from malignant ones, but may fail to differentiate aggressive benign tumors from low-grade malignant ones. CT sialography was done to detect the relation between the trunk of the facial nerves and tumor according to the band of normal parotid tissue between the tumor and posterior border of the mandibular ramus, and incremental dynamic CT with intravenous bolus injection of contrast medium to detect the relation between the tumor and carotid sheath. We conclude that the images of CT sialography are much better than those of plain CT and intravenous enhancement CT.

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