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Investigation on the Copper Content of Matte Smelting Slag in Peirce-Smith Converter

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Journal of university of Science and technology Beijing 2001年第3期8卷 177-181页

作者： Chunlin Chen, Jiayun Zhang, Meng Bai, Shoukun Wei Metallurgy School, university of Science & technology Beijing, Beijing 100083, China Guixi Smelter, Jiangxi Copper Co. Ltd., Jiangxi 335424, China Metallurgy School Univ. of Sci. and Tech. Beijing Beijing 100083 China

The copper contents and its existing forms in the slags during the slag-making stage of Peirce-Smith converters in Guixi Smelter, Jiangxi Province, China have been investigated. The investigation was based on plant trials with the corresponding thermodynamic calculations and kinetic considerations. From the plant data, the total copper content in the slags was in the range of 2% to 8% (mass fraction). The mechanical entrainment of matte drops has been found to be the main cause of the copper loss. The suspension index, defined as the ratio of the mass fraction of copper in suspended matte drops in the slag to that in bulk of the matte phase, has been adopted to quantify the matte entrainment. The values of this parameter estimated in this work have been found mainly within a range of 2.5%-8.0%. The Fe3O4 content in the slag has been estimated to be the most important factor, among others, influencing the separation of slag with matte and, consequently, the copper loss from the slag.

关键词： Peirce-Smith converter copper content molten slag

A Neuro-Muscular Elasto-Dynamic Model of the Human Arm Part 1:Model Development

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Journal of Bionic Engineering 2009年第2期6卷 93-107页

作者： Alan A.Barhorst Lawrence Schovanec Texas tech university Department of Mechanical Engineering Texas tech university Department of Mathematics and Statistics

In this paper we develop an elasto-dynamic model of the human arm for use in neuro-muscular control and dynamic interaction *** motivation for this work is to present a case for developing and using non-quasistatic models of human musculo-skeletal *** model is based on hybrid parameter multiple body system(HPMBS)variational projection *** this paper,we present an overview of the HPMBS variational principle applied to the full elasto-dynamic model of the *** generality of the model allows one to incorporate muscle effects as either loads transmitted through the tendon at points of origin and insertion or as an effective torque at a *** the technique is suitable for detailed bone and joint modeling,we present in this initial effort only simple geometry with the bones discretized as Rayleigh beams with elongation, while allowing for large *** demonstrate the viability of the mcthod for use in the companion paper and in future studies.

关键词： elasto-dynamics hybrid parameter system musculo-skeletal model neuro-muscular model

A Neuro-Muscular Elasto-Dynamic Model of the Human Arm Part 2:Musculotendon Dynamics and Related Stress Effects

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Journal of Bionic Engineering 2009年第2期6卷 108-119页

作者： Cody B.Moody Alan A.Barhorst Lawrence Schovanec Texas tech university Department of Mechanical Engineering Texas tech university Department of Mathematics and Statistics

In this paper we develop an elasto-dynamic model of the human arm that includes effects of neuro-muscular control upon elastic deformation in the *** elasto-dynamic model of the arm is based on hybrid parameter multiple body system variational projection principles presented in the companion *** the technique is suitable for detailed bone and joint modeling,we present simulations for simplified geometry of the bones,discretized as Rayleigh beams with elongation,while allowing for large *** of the upper extremity is simulated by incorporating muscle forces derived from a Hill-type model of musculotendon *** effects of muscle force are modeled in two *** one approach,an effective joint torque is calculated by multiplying the muscle force by a joint moment ann.A second approach models the muscle as acting along a straight line between the origin and insertion sites of the *** arm motion is simulated by utilizing neural feedback and feedforward *** illustrate the combined effects of neural control strategies, models of muscle force inclusion,and elastic assumptions on joint trajectories and stress and strain development in the bone and tendon.

关键词： elasto-dynamics hybrid parameter system musculo skeletal model neuro-muscular model

An Analysis of Social Vulnerability to Natural Hazards in Nepal Using a Modified Social Vulnerability Index

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International Journal of Disaster Risk Science 2019年第1期10卷 103-116页

作者： Sanam K.Aksha Luke Juran Lynn M.Resler Yang Zhang Department of Geography Virginia Tech Virginia Water Resources Research Center Virginia Tech Urban Affairs and Planning Virginia Tech

Social vulnerability influences the ability to prepare for, respond to, and recover from disasters. The identification of vulnerable populations and factors that contribute to their vulnerability are crucial for effective disaster risk reduction. Nepal exhibits multihazard risk and has experienced socioeconomic and political upheaval in recent decades, further increasing susceptibility to ***, we still know little regarding social vulnerability in Nepal. Here, we investigate social vulnerability in Nepal by adapting Social Vulnerability Index(SoVI) methods to the Nepali context. Variables such as caste, and populations who cannot speak/understand Nepali were added to reflect the essence of the Nepali context. Using principal component analysis, 39 variables were reduced to seven factors that explained 63.02% of variance in the *** scores were summarized to calculate final SoVI scores. The highest levels of social vulnerability are concentrated in the central and western Mountain, western Hill, and central and eastern Tarai regions of Nepal, while the least vulnerable areas are in the central and eastern Hill regions. These findings, supplemented with smaller-scale analyses, have the potential to assist village officers, policymakers,and emergency managers in the development of more effective and geographically targeted disaster management programs.

关键词： Disaster risk reduction Natural hazards Nepal Principal component analysis Social Vulnerability Index

Real-time fault detection method based on belief rule base for aircraft navigation system

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Chinese Journal of Aeronautics 2013年第3期26卷 717-729页

作者： Zhao Xin Wang Shicheng Zhang Jinsheng Fan Zhiliang Min Haibo High-tech Institute of Xi'an

Real-time and accurate fault detection is essential to enhance the aircraft navigation system’s reliability and safety. The existent detection methods based on analytical model draws back at simultaneously detecting gradual and sudden faults. On account of this reason, we propose an online detection solution based on non-analytical model. In this article, the navigation system fault detection model is established based on belief rule base （BRB）, where the system measuring residual and its changing rate are used as the inputs of BRB model and the fault detection function as the output. To overcome the drawbacks of current parameter optimization algorithms for BRB and achieve online update, a parameter recursive estimation algorithm is presented for online BRB detection model based on expectation maximization （EM） algorithm. Furthermore, the proposed method is verified by navigation experiment. Experimental results show that the proposed method is able to effectively realize online parameter evaluation in navigation system fault detection model. The output of the detection model can track the fault state very well, and the faults can be diagnosed in real time and accurately. In addition, the detection ability, especially in the probability of false detection, is superior to offline optimization method, and thus the system reliability has great improvement.

关键词： Belief rule base Fault detection Fault tolerant control Integrated navigation Parameter recursive estimation algorithm

Nanoimprint lithography-assisted block copolymer self-assembly for hyperfine fabrication of magnetic patterns based on L10-FePt nanoparticles

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Science China Chemistry 2025年

作者： Jie Zhang Yi Chen Guijun Li Zelin Sun Zhengong Meng Wai-Yeung Wong Department of Applied Biology and Chemical technology and Research Institute for Smart Energy The Hong Kong Polytechnic University The Hong Kong Polytechnic university Shenzhen Research Institute Division of Integrative Systems and Design and Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology School of Flexible Electronics (Future technology) and Institute of Advanced Materials (IAM) Nanjing Tech University

L10-FePt-type bit-patterned media has provided a promising alternative for ultrahigh-density magnetic recording systems in the current digital era, but rapid fabrication of magnetic patterns with hyperfine bit islands is still challenging, especially with the target for miniaturization and scalable production simultaneously. Herein, Fe,Pt-containing block copolymers were utilized as single-source precursors for solution-processable patterning and subsequent generation of the demanding magnetic FePt dots by in situ pyrolysis. High-throughput nanoimprint lithography was initially employed to fabricate the predefined bit cells precisely,and then the intrinsic self-assembly of phase-separated block copolymers further drove the formation of accurate bit *** from the synergistic effect of top-down lithographic approach and bottom-up self-assembly, the customizable patterns could be achieved for large-scale mass production in targeted areas, but high-density isolated dots could also be accurately aligned along the patterned features after subsequent self-assembly. This reliable strategy would provide a good avenue to precisely construct ultrahigh-density magnetic data storage devices.

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OPTIMAL INVERSE LQG CONTROL FOR CERTAIN ODE AND PDE STATIONARY PROCESSES

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Journal of Systems Science & Complexity 2010年第3期23卷 584-599页

作者： David L.RUSSELL Department of Mathematics Virginia Tech

Following work carried out earlier on linear-quadratic optimal control for linear finitedimensional stationary systems we report,in this article,on extension of some of those results to certaininfinite dimensional systems;in particular a class of PDE systems of elliptic *** systems arestudied in the now familiar framework developed by *** and ***,specialized to asubclass of such systems important in a variety of *** an extended example this paperstudies an optimal redistribution problem in a groundwater flow system governed by Darcy's equation,presenting both analytic and computational work related to such problems.

关键词： Elliptic PDE linear feedback control stationary system.

Nonparametric estimation for contamination distribution

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Applied Mathematics(A Journal of Chinese universities) 2008年第2期23卷 175-182页

作者： HUI Jun MIAO Bai-qi NING Jing PENG Heng Dept. of Statist. and Finance Univ. of Sci. and Tech. of China Hefei 230026 China Dept. of Math. Hefei Univ. of Tech. Hefei 230009 China

In the paper, for the contamination distribution model F（x） = （1-α）F1（x）＋αF2（x）, the estimates of α and F1 （x） are studied using two different ways when F2 （x） is known and the strong consistency of th... 详细信息

关键词： contamination distribution strong consistency rate of consistency.

CALCULATION FOR PATH-DOMAIN INDEPENDENT J INTEGRAL WITH ELASTO-VISCOPLASTIC CONSISTENT TANGENT OPERATOR CONCEPT-BASED BOUNDARY ELEMENT METHODS

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Acta Mechanica Sinica 1999年第2期15卷 164-175页

作者：刘勇洪起超梁利华 Dept. of Mech. Eng. Zhejiang Univ. of Tech. Hangzhou China 310014

This paper presents an elasto-viscoplastic consistent tangent operator (CTO) based boundary element formulation, and application for calculation of path-domain independentJ integrals (extension of the classicalJ integrals) in nonlinear crack analysis. When viscoplastic deformation happens, the effective stresses around the crack tip in the nonlinear region is allowed to exceed the loading surface, and the pure plastic theory is not suitable for this situation. The concept of consistency employed in the solution of increment viscoplastic problem, plays a crucial role in preserving the quadratic rate asymptotic convergence of iteractive schemes based on Newton's method. Therefore, this paper investigates the viscoplastic crack problem, and presents an implicit viscoplastic algorithm using the CTO concept in a boundary element framework for path-domain independentJ integrals. Applications are presented with two numerical examples for viscoplastic crack problems andJ integrals.

关键词： boundary element method (BEM) consistent tangent operator (CTO) elasto-viscoplasticity path-domain independentJ integral fracture mechanics