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An approach to the capsule endoscopic robot with active drive motion

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第3期12卷 223-231页

作者： Da-qiang gu Yong ZHOU Department of Mechanical Engineering Zhejiang University Hangzhou 310027 China

Commercialized capsule-type endoscopes move passively by peristaltic waves (and gravity),which makes it difficult for doctors to diagnose the areas of interest more thoroughly and *** resolve this problem of passivity,it is necessary to find a special locomotion principle,which fits the gastrointestinal (GI) *** this paper,a legged locomotive mechanism with shape memory alloy (SMA) actuation based on the peristaltic principle is proposed,and then the structure of the locomotion mechanism is *** on the preliminary results,the design,modeling,and fabrication of an SMA microactuation concept for application in an endoscopic capsule are given,as well as the SMA spring and legged component design,which is the core section of the system *** used the pseudo-rigid-body model (PRBM) to analyze nonlinear and large deflections of the SMA legged ***,a prototype endoscope with an SMA spring and six legged components was designed and *** is 15 mm in diameter and 33 mm in total length,with a hollow space to house other parts needed for endoscopy such as a camera,a radio frequency (RF) module,and *** testing,the locomotive mechanism was effective in a plastic tube environment.

关键词： Capsular endoscopy Shape memory alloy (SMA) Microactuation Locomotion

Dilaton Black Hole Tunneling Radiation in de Sitter Universe

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Communications in Theoretical Physics 2009年第3期51卷 453-454页

作者： LI gu-qiang School of Physics Science ＆ Technology Zhanjiang Normal University Zhanjiang 524048 China

The Hawking radiation via tunneling from the dilaton black hole in de Sitter universe is investigated using Parikh Wilczek＇s method. We show that if the self-gravitational interaction and energy conservation are taken into account, the modified radiation spectrum deviates from exact thermal spectrum and satisfies the unitary theory.

关键词： tunneling radiation de Sitter universe dilaton black hole

Spin-Dependent Term of Thermodynamic Quantity Around a Black Hole

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Communications in Theoretical Physics 2008年第1期49卷 126-128页

作者： LI gu-qiang Department of Physics Zhanjiang Normal College Zhanjiang 524048 China

The entropy density, energy density, pressure, and equation of state of an ideal relativistic gas around the Schwarzschild-anti-de Sitter black hole with a global monopole are investigated by using the brick-wall method. It is shown that the sub-leading term with spin-dependence exists and that the corrected expression for any spin field is very different from that for scalar field. The usual result that these thermodynamical quantities take the same forms as those in fiat spacetime holds only for the leading term.

关键词： thermodynamical quantity brick-wall method Boulware vacuum state Schwarzschild-anti-deSitter black hole with a global monopole

Development of an improved CBR model for predicting steel temperature in ladle furnace refining

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International Journal of Minerals,Metallurgy and Materials 2021年第8期28卷 1321-1331页

作者： Fei Yuan An-jun Xu Mao-qiang gu School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

In the prediction of the end-point molten steel temperature of the ladle furnace, the influence of some factors is nonlinear. The prediction accuracy will be affected by directly inputting these nonlinear factors into the data-driven model. To solve this problem, an improved case-based reasoning model based on heat transfer calculation(CBR-HTC) was established through the nonlinear processing of these factors with software Ansys. The results showed that the CBR-HTC model improves the prediction accuracy of end-point molten steel temperature by5.33% and 7.00% compared with the original CBR model and 6.66% and 5.33% compared with the back propagation neural network(BPNN)model in the ranges of [-3, 3] and [-7, 7], respectively. It was found that the mean absolute error(MAE) and root-mean-square error(RMSE)values of the CBR-HTC model are also lower. It was verified that the prediction accuracy of the data-driven model can be improved by combining the mechanism model with the data-driven model.

关键词： case-based reasoning LF refining steel temperature prediction ladle lining

Preparation of TeO_x-SiO_2 film with excellent third-order nonlinear optical properties by electrochemically induced sol-gel method

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Chinese Chemical Letters 2011年第11期22卷 1359-1362页

作者： qiang Li Min gu State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam Key Lab for the Exploitation of Southwestern Resources and the Environmental Disaster Control Engineering of Education Ministry College of Resources and Environmental Science Chongqing University Chongqing 400044 China

TeOx-SiO2 composite films having third-order nonlinearities were prepared by electrochemically induced sol-gel deposition method on ITO *** third-order optical nonlinearities of the films were measured by Z-scan *** third-order nonlinear susceptibilities（χ^（（3））） of the as-prepared films are 5.9×10^（-7） to 4.29×10^（-6）*** surface morphology and composition of the films were characterized by SEM/EDX,which identified that Te metallic particles well dispersed in TeO_x-SiO_2 gel films.

关键词： TeOx-SiO2 composite Electrochemically induced sol-gel method Third-order nonlinearities Z-scan

Dynamics of Bose-Einstein condensates in a one-dimensional optical lattice with double-well potential

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Frontiers of physics 2013年第4期8卷 375-380页

作者： Han-Lei Zheng qiang gu Department of Physics University of Science and Technology Beijing Beijing 100083 China

We study dynamical behaviors of the weakly interacting Bose-Einstein condensate in the one- dimensional optical lattice with an overall double-well potential by solving the time-dependent Gross-Pitaevskii equation. It is observed that the double-well potential dominates the dynamics of such a system even if the lattice depth is several times larger than the height of the double-well potential. This result suggests that the condensate flows without resistance in the periodic lattice just like the case of a single particle moving in periodic potentials. Nevertheless, the effective mass of atoms is increased, which can be experimentally verified since it is connected to the Josephson oscillation frequency. Moreover, the periodic lattice enhances the nonlinearity of the double-well condensate, making the condensate more ＂self-trapped＂ in the ^-mode self-trapping regime.

关键词： Bose-Einstein condensate double-well potential optical lattice dynamical behavior

Factors Influencing Glucoraphanin and Sulforaphane Formation in Brassica Plants:A Review

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Journal of Integrative Agriculture 2012年第11期11卷 1804-1816页

作者： gu Zhen-xin guO qiang-hui gu Ying-juan College of Food Science and Technology Nanjing Agricultural University Nanjing 210095 P.R.China

Sulforaphane is a type of sulfur-containing isothiocyanates hydrolyzed from glucosinolates by myrosinase found in Brassica plants. Sulforaphane is a naturally occurring inducer of phase II enzymes in human and animal bodies to detoxify cancer-causing chemicals. Glucoraphanin is the precursor of sulforaphane and its content is greatly influenced by plant species and genotype, plant organs, pre-harvest factors, and post-harvest processing, thus sulforaphane formation is also directly influenced. Here, we review the formation mechanism of sulforaphane and the factors influencing sulforaphane formation. In the end, the future directions are also discussed.

关键词： Brassica plant glucosinolate sulforaphane glucoraphanin influencing factor

First-principles study of the co-effect of carbon doping and oxygen vacancies in ZnO photocatalyst

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Chinese Physics B 2021年第2期30卷 419-425页

作者： Jia Shi Lei Wang qiang gu Department of Physics University of Science and Technology BeijingBeijing 100083China

Although tuning band structure of optoelectronic semiconductor-based materials by means of doping single defect is an important approach for potential photocatalysis application,C-doping or oxygen vacancy(Vo)as a single defect in ZnO still has limitations for photocatalytic ***,the influence of co-existence of various defects in ZnO still lacks sufficient ***,we investigate the photocatalytic properties of ZnOx C0.0625(x=0.9375,0.875,0.8125),confirming that the co-effect of various defects has a greater enhancement for photocatalytic activity driven by visible-light than the single defect in *** clarify the underlying mechanism of co-existence of various defects in ZnO,we perform systematically the electronic properties calculations using density functional *** is found that the coeffect of C-doping and Vo in ZnO can achieve a more controllable band gap than doping solely in ***,the impact of the effective masses of ZnO_(x)C_(0.0625)(x=0.9375,0.875,0.8125)is also taken into *** comparison with heavy Vo concentrations,the light Vo concentration(x=0.875)as the optimal component together with C-doping in ZnO,can significantly improve the visible-light absorption and benefit photocatalytic activity.

关键词： first-principles theory electron density of states and band structure of crystalline solids Ⅲ-ⅤandⅡ-Ⅵsemiconductors

Development of materials database system for cae system of heat treatment based on data mining technology

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中国有色金属学会会刊：英文版 2006年第B02期16卷 572-576页

作者： gu qiang ZHONG Rui JU Dong-ying Graduate School of Engineering Saitama Institute of Technology Fusaiji 1690 Fukaya Saitama 369-0293 Japan Computer Science Deptartment Saitama Institute of Technology Fusaiji 1690 Fukaya Saitama 369-0293 Japan

Computer simulation for materials processing needs a huge database containing a great deal of various physical properties of materials. In order to employ the accumulated large data on materials heat treatment in the past years, it is significant to develop an intelligent database system. Based on the data mining technology for data analysis, an intelligent database web tool system of computer simulation for heat treatment process named as IndBASEweb-HT was built up. The architecture and the arithmetic of this system as well as its application were introduced.

关键词：材料加工数据库系统 CAE系统热处理数据挖掘技术