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Magnetic property and recording performance of chemical deposition CoP thin films

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Rare Metals 2012年第3期31卷 260-263页

作者： wang, Haicheng Zhou, Qunfei Teng, Jiao wang, lijin Yu, Guanghua Department of Material Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China

The thickness of CoP thin films prepared by wet chemical deposition is of crucial importance on magnetic property and recording perform-ance. The coercivity of CoP films decreased with increasing film thickness. The coercivity was 45.37 kA m 1 at the thickness of 300 nm, and decreased to 21.65 kA m 1 at 5.7 μm. Recording performance tests indicate that, for drums with the same size, different recorded magnetic pole density have different thickness requirements. For 40 mm diameter magnetic drum, the optimal CoP thickness is 3～10 μm for 256 re-corded magnetic poles, 1～2 μm for 512 recorded magnetic poles, and 500～800 nm for 1024 recorded magnetic poles.

关键词： CoP thin films magnetic property magnetic recording

Stochastic Multi-Symplectic Integrator for Stochastic Nonlinear Schrodinger Equation

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Communications in Computational Physics 2013年第7期14卷 393-411页

作者： Shanshan Jiang lijin wang Jialin Hong College of Science Beijing University of Chemical TechnologyBeijing 100029P.R.China School of Mathematical Sciences Graduate University of Chinese Academy of SciencesBeijing 100049P.R.China State Key Laboratory of Scientific and Engineering Computing Institute of ComputationalMathematics and Scientific/Engineering ComputingAcademy of Mathematics and System ScienceChinese Academy of SciencesP.O.Box 2719Beijing 100190P.R.China

In this paper we propose stochastic multi-symplectic conservation law for stochastic Hamiltonian partial differential equations,and develop a stochastic multisymplectic method for numerically solving a kind of stochastic nonlinear Schrodinger *** is shown that the stochasticmulti-symplecticmethod preserves themultisymplectic structure,the discrete charge conservation law,and deduces the recurrence relation of the discrete *** experiments are performed to verify the good behaviors of the stochastic multi-symplectic method in cases of both solitary wave and collision.

关键词： Stochastic nonlinear Schrodinger equations stochasticmulti-symplectic Hamiltonian systems multi-symplectic integrators

Preparation and magnetic properties of Co-P thin films

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Journal of University of Science and Technology Beijing 2008年第5期15卷 618-621页

作者： Haicheng wang Zhongmei Du lijin wang Guanghua Yu Fengwu Zhu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Magnetic Co-P thin films were prepared by electroless deposition. The experiment results show that the film thickness has a significant influence on the coercivity. While the film thickness varied from 300 nm to 5 μm,the coercivity dropped sharply from 45.36 to 22.28 kA/m. As the film thickness increased further,the coercivity varied slowly. When the thickness of the film was 300 nm,the deposited film could realize the coercivity as high as 45.36 kA/m,and the remanent magnetization as high as 800 kA/m .The Co-P films were deposited on the surface of magnetic drums of encoders,whose diameter was 40 mm,and then 512 magnetic poles were recorded,meaning that the magnetizing pitch was 0.245 mm. The testing results indicate that the output signals are perfect,the output waveforms are steady and the pulses account is integral. Compared with the γ-Fe2O3 coating,the Co-P thin film is suitable to be the magnetic recording media for the high resolution magnetic rotary encoder.

关键词： magnetic thin film electroless deposition magnetic properties magnetic recording media

Accumulation and potential sources of heavy metals in soils of the Hetao area,Inner Mongolia,China

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Pedosphere 2020年第2期30卷 244-252页

作者： Yangchun ZHU lijin wang Xueyong ZHAO Jie LIAN Zhenhua ZHANG Ecology Institute Lishui UniversityLishui 323000China Institute of Agricultural Resource and Environmental Sciences Jiangsu Academy of Agricultural SciencesNanjing 210014China Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000China

Soil contamination by heavy metals is a problem in agricultural irrigation *** assess the accumulation and sources of heavy metals in the Yongji irrigation district of the Hetao area,Inner Mongolia,China,195 soil samples from 39 sites(0–100 cm)were collected,and Zn,Cu,Pb,Cr,and Cd concentrations were *** mean concentrations were 107.17,32.48,12.31,53.53,and 0.22 mg kg-1,respectively,with no significant differences between soil depths(P>0.05).Concentrations of Zn,Cu,and Cd were higher than the background levels,with moderate accumulation;the contamination factor(CF)values were 1.9,1.7,and 1.9,respectively,and the geoaccumulation index(Igeo)was>*** of Pb and Cr were lower than,or close to,the background levels(CF<1,Igeo<0),indicating that they originated from a natural *** monomial potential ecological risk index(Eri)for Zn,Cu,Pb,and Cr was low;Eri for Cd was 55.73,implying a moderate *** grade of potential ecological risk index of the five heavy metals(RI)was low,declining from south to *** studied soils were contaminated with Zn,Cu,and Cd;principal component(PC)analysis implicated the enrichment of Cd and partial Cu(high loading in PC 2)was related to agricultural activities;Zn and partial Cu,closely associated with PC 3,may have originated from irrigation water from the Yellow *** agricultural development should focus on fertilizer and pesticide application and the quality of irrigation water.

关键词： agricultural activity contamination factor geoaccumulation index potential ecological risk principal component analysis soil layer spatial distribution

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基于YOLOv5的刮板输送机断链监测技术

山西焦煤科技 2024年第6期48卷 8-10,14页

作者：翟伟陈鹏飞王李进华晋焦煤有限责任公司山西吕梁033000

为进一步提升刮板输送机链条的运行状态监测水平,提出了一种基于机器视觉的刮板输送机断链监测系统,利用YOLOv5算法对刮板输送机运行视频流中的链条图像特征进行学习,并对链条的区域图像进行分割展现,实现刮板输送机断链的有效监测。实... 详细信息

为进一步提升刮板输送机链条的运行状态监测水平,提出了一种基于机器视觉的刮板输送机断链监测系统,利用YOLOv5算法对刮板输送机运行视频流中的链条图像特征进行学习,并对链条的区域图像进行分割展现,实现刮板输送机断链的有效监测。实验表明,对于实际工况下的链条运行状态,YOLOv5算法的监测表现优异,损失值低于0.005 421,且联动报警器,可实现链条异常运行状态的报警。

关键词：刮板输送机断链监测 YOLOv5算法图像分割

A Symplectic Based Neural Network Algorithm for Quantum Controls under Uncertainty

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Communications in Computational Physics 2022年第5期31卷 1525-1545页

作者： Jingshi Li Song Chen lijin wang Yanzhao Cao Department of Mathematics and Statistics Nanjing University of Information Science and TechnologyNanjingJiangsu210044P.R.China Department of Mathematics&Statistics University of Wisconsin–La CrosseLa CrosseWI54601USA School of Mathematical Sciences University of Chinese Academy of SciencesBeijing100049P.R.China Department of Mathematics&Statistics Auburn UniversityAuburnAL36830USA

Robust quantum control with uncertainty plays a crucial role in practical quantum *** paper presents a method for solving a quantum control problem by combining neural network and symplecticfinite difference *** neural network approach provides a framework that is easy to establish and *** the same time,the symplectic methods possess the norm-preserving property for the quantum system to produce a realistic solution in *** construct a general high dimensional quantum optimal control problem to evaluate the proposed method and an approach that combines a neural network with forward Euler’s *** analysis and numerical experiments confirm that the neural network-based symplectic method achieves significantly better accuracy and robustness against noises.

关键词： Quantum(noise)control neural network symplectic methods norm-preservation

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新型锚固剂快速装入器动力学特性研究

科技创新与应用 2024年第14期14卷 32-36页

作者：王李进李锐张林军张景良华晋焦煤有限责任公司山西吕梁033000 泰安市特种设备检验研究院山东泰安271001

针对当前国内锚杆支护操作中存在的人员登高危险、锚固剂装填困难以及安装效率低下等问题,该研究开发一种新型的锚固剂快速装入器。该装入器利用空气压力将锚固剂通过导管顺利注入锚杆孔中,从而方便锚固剂的装填,并减少锚固剂的损耗,提... 详细信息

针对当前国内锚杆支护操作中存在的人员登高危险、锚固剂装填困难以及安装效率低下等问题,该研究开发一种新型的锚固剂快速装入器。该装入器利用空气压力将锚固剂通过导管顺利注入锚杆孔中,从而方便锚固剂的装填,并减少锚固剂的损耗,提高装填效率。为深入探究锚固剂快速装入器的动力学特性,进行流固耦合分析,并得到在不同气压力下锚固剂在导管中的动力学特性数据。最后,采用锚固剂快速装入器成功地对模拟的锚杆孔进行锚固剂装填,获得令人满意的装填效果。

关键词：锚固剂快速装入器流固耦合动力特性装填

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基于DeeplabV3的煤岩界面识别方法

山西焦煤科技 2024年第9期48卷 51-53页

作者：陈鹏飞翟伟王李进陈智星华晋焦煤有限责任公司山西吕梁033000

针对煤岩界面识别技术中存在的检测精确率低、实时性差等问题,提出了一种基于DeeplabV3的煤岩图像识别方法。以沙曲二矿某工作面为工程背景,通过摄像仪采集自制煤岩图像并对其进行图像增强处理,丰富数据集信息,采用Xception网络提取煤... 详细信息

针对煤岩界面识别技术中存在的检测精确率低、实时性差等问题,提出了一种基于DeeplabV3的煤岩图像识别方法。以沙曲二矿某工作面为工程背景,通过摄像仪采集自制煤岩图像并对其进行图像增强处理,丰富数据集信息,采用Xception网络提取煤岩图像的语义特征信息,通过DeeplabV3算法实现煤岩的识别。实验结果表明:DeeplabV3模型能够实现煤岩图像的精确分割,平均交并比为0.98,具备较强的现场应用性。

关键词：煤岩识别 DeeplabV3 图像分割特征提取

Nonperturbative effects of attraction on dynamical behaviors of glass-forming liquids

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Chinese Physics B 2020年第12期29卷 396-401页

作者： Xiaoyan Sun Haibo Zhang lijin wang Zexin Zhang Yuqiang Ma Wenzheng College of Soochow University Suzhou 215104China Center for Soft Condensed Matter Physics and Interdisciplinary Research Soochow UniversitySuzhou 215006China School of Physics and Materials Science Anhui UniversityHefei 230601China College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210093China

We investigate systematically the effects of the inter-particle attraction on the structure and dynamical behaviors of glass-forming liquids via molecular dynamics *** find that the inter-particle attraction does not influence the structure,but greatly affects the dynamics and dynamical heterogeneity of the *** the system changes from a purely repulsive glass-forming liquid to an attractive one,the dynamics slows down and the dynamical heterogeneity becomes greater,which is found interestingly to be associated with larger cooperative rearrangement regions(CRRs).Additionally,the structures of CRRs are observed to be compact in attractive glass-forming liquids but string-like in purely repulsive *** findings constitute an important contribution to the ongoing study of the role of attractions in properties of glasses and glass-forming liquids.

关键词： attractive glass dynamics dynamical heterogeneity cooperative rearrangement regions(CRRs)