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Flexible Scanning Method by Integrating Laser Line Sensors with Articulated Arm Coordinate Measuring Machines

chinese Journal of Mechanical Engineering 2022年第5期35卷 131-140页

作者： Zexiao Xie ping Yu Hanlei Gong Shukai chi Xiang Gao College of Engineering Ocean University of ChinaQingdao 266100China

Measuring and reconstructing the shape of workpieces have been considered as a fundamental step in both reverse engineering and product quality *** to increasing structural complexity of recent products,measurements from multiple directions are typically required in current scanning ***,the plane structured light can be applied to measure one area of a part at a time,with an additional algorithm required to merge the collected data of each ***,the line structured light sensor integrated on CNC machines or CMMs could also realize multi-view ***,the system needs to be repeatedly calibrated at each new *** paper presents a flexible scanning method by integrating laser line sensors with articulated arm coordinate measuring machines(AACMM).Since the output of the laser line sensor is 2D raw data in the laser plane,our system model introduces an explicit transformation from the 2D sensor coordinate frame to the 3D base coordinate frame of the AACMM(i.e.,the translation and rotation the of the 2D sensor coordinate in the sixth coordinate system of AACMM).To solve the model,the“conjugate pairs”are proposed and identified by measuring a fixed point(e.g.,a sphere center).Moreover,a search algorithm is adopted to find the optimal solution,which noticeably boosts the model *** experimental results show that the error of the system is about 0.2 mm,which is caused by the error of the AACMM,the sensor error and the calibration *** measuring a complicated part,the proposed system is proved to be flexible and facilitate,with the ability to measure a part expediently from any necessary ***,the proposed calibration method can also be used for robot hand-eye relationship calibration.

关键词： Reverse engineering Laser line sensors Articulated arm coordinate measuring machines Conjugate pairs

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Evidence-Based chinese Medicine Clinical Practice Guideline for Stomach Pain in Hong Kong

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chinese Journal of Integrative Medicine 2017年第10期23卷 793-800页

作者： ZHONG Linda LD SHI Nan-nan Dai Liang ZIEA Tat chi NG Bacon TANG Xu-dong BIAN Zhao-xiang LU ai-ping Hong Kong chinese Medicine Study Centre Hong Kong Baptist University Hong Kong SAR China School of chinese Medicine Hong Kong Baptist University Hong Kong SAR China Institute of Basic Research in Clinical Medicine China Academy of Traditional Chinese Medicine Beijing (100091) China Department of chinese Medicine Hong Kong Hospital Authority Hong Kong SAR China Department of Gastroenterology Xiyuan Hospital China Academy of Chinese Medical Sciences Beijing (100091) China

Stomach pain in chinese medicine（CM） is a very common disorder in clinical practice and it has been listed as one of the pilot three conditions in Hong Kong to develop evidence-based CM clinical practice guidelines（CM CPGs）. The aim of this stomach Pain CPG is to summarize the treatment methods of stomach pain with CM and evaluate reasonably, then to guide local licensed CM practitioners and provide beneficial reference for social medical decision makers and patients. In this manuscript, we defined stomach pain in CM and the category of chronic gastritis in Western medicine. The clinical manifestation, CM pattern classification, and CM intervention including herbal medicine treatment based on pattern differentiation, symptomatic treatment, acupuncture treatment, regulation and nursing were illustrated.

关键词： clinical practice guideline chinese medicine pattern chinese herbal medicine stomach pain

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Two Improvements on Numerical Simulation of 2-DOF Vortex-Induced Vibration with Low Mass Ratio

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china Ocean Engineering 2017年第6期31卷 764-772页

作者： KANG Zhuang NI Wen-chi ZHANG Xu SUN Li-ping Deepwater Engineering Research Center Harbin Engineering University Harbin 150001 China

Till now, there have been lots of researches on numerical simulation of vortex-induced vibration. Acceptable results have been obtained for fixed cylinders with low Reynolds number. However, for responses of 2-DOF vortex-induced vibration with low mass ratio, the accuracy is not satisfactory, especially for the maximum amplitudes. In Jauvtis and Williamson＇s work, the maximum amplitude of the cylinder with low mass ratio m＊=2.6 can reach as large as 1.5D to be called as the ＂super-upper branch＂, but from current literatures, few simulation results can achieve such value, even fail to capture the upper branch. Besides, it is found that the amplitude decays too fast in the lower branch with the RANS-based turbulence model. The reason is likely to be the defects of the turbulence model itself in the prediction of unsteady separated flows as well as the unreasonable setting of the numerical simulation parameters. aiming at above issues, a modified turbulence model is proposed in this paper, and the effect of the acceleration of flow field on the response of vortex-induced vibration is studied based on OpenFOAM. By analyzing the responses of amplitude, phase and trajectory, frequency and vortex mode, it is proved that the vortex-induced vibration can be predicted accurately with the modified turbulence model under appropriate flow field acceleration.

关键词： 2-DOF vortex-induced vibration numerical simulation modified turbulence model acceleration

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On the Positivity of Linear Weights in WENO Approximations

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Acta Mathematicae Applicatae Sinica 2009年第3期25卷 503-538页

作者： Yuan-yuan Liu chi-wang Shu Meng-ping Zhang Department of Mathematics University of Science and Technology of China Hefei 230026 China Division of Applied Mathematics Brown University Providence RI 02912 USA

High order accurate weighted essentially non-oscillatory （WENO） schemes have been used extensively in numerical solutions of hyperbolic partial differential equations and other convection dominated problems. However the WENO procedure can not be applied directly to obtain a stable scheme when negative linear weights are present. In this paper, we first briefly review the WENO framework and the role of linear weights, and then present a detailed study on the positivity of linear weights in a few typical WENO procedures, including WENO interpolation, WENO reconstruction and WENO approximation to first and second derivatives, and WENO integration. Explicit formulae for the linear weights are also given for these WENO procedures. The results of this paper should be useful for future design of WENO schemes involving interpolation, reconstruction, approximation to first and second derivatives, and integration procedures.

关键词： Weighted essentially non-oscillatory (WENO) scheme hyperbolic partial differential equations WENO interpolation WENO reconstruction WENO approximation to derivatives WENO integration

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Review:Acute lung injury/acute respiratory distress syndrome (ALI/ARDS): the mechanism,present strategies and future perspectives of therapies

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第1期8卷 60-69页

作者： LUH Shi-ping chiANG chi-huei Department of Surgery Chung-Shan Medical University Hospital 402 Taichung Taiwan China Division of Pulmonary Immunology and Infectious Diseases Taipei Veterans General Hospital 112 Taipei Taiwan China

Acute lung injury/acute respiratory distress syndrome （ALI/ARDS）, which manifests as non-cardiogcnic pulmonary edema, respiratory distress and hypoxemia, could be resulted from various processes that directly or indirectly injure the lung. Extensive investigations in experimental models and humans with ALI/ARDS have revealed many molecular mechanisms that offer therapeutic opportunities for cell or gene therapy. Herein the present strategies and future perspectives of the treatment for ALI/ARDS, include the ventilatory, pharmacological, as well as cell therapies.

关键词： Acute lung injury Acute respiratory distress syndrome Ventilator Cell therapy

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Corrosion Behavior of Low-Alloy Pipeline Steel with 1% Cr Under CO_2 Condition

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Acta Metallurgica Sinica(English Letters) 2015年第6期28卷 739-747页

作者： Zhen-Guang Liu Xiu-Hua Gao chi Yu Lin-Xiu Du Jian-ping Li ping-Ju Hao The State Key Lab of Rolling and Automation Northeastern University School of Resource and Material Northeastern University at Qinhuangdao Mechanical and Electrical Engineering Shijiazhuang Vocational College for Scientific and Technical Engineering

Carbon dioxide corrosion behavior of low-alloy pipeline steel with 1% Cr exposed to CO2-saturated solution was investigated by immersion experiment. SEM, EDX, TEM, EPMA and XRD were utilized to investigate the microstructure, corrosion morphologies, corrosion phases and elements distribution of corrosion scale. The results demon strate that the microstructure of tested steel consists of ferrite and carbides. During the corrosion process, ferrite dissolves preferentially, leaving carbide particles behind. The residual carbide particles may promote the nucleation of FeCO3 crystal. The phase comprising of the inner layer is Cr compound, and the one of the outer layer is FeCO3. The formation process of corrosion scale can be illustrated as follows： Firstly, a thin scale consisting of thin inner layer and outer layer is formed, which represents poor corrosion resistance; then, the inner layer changes little, once it has been formed, and the outer layer becomes thick and compact, which demonstrates that a fine corrosion resistance is obtained. The chemical elements of chromium and molybdenum accumulate in the inner layer of corrosion scale. The corrosion behavior of low- alloy steel based on microstructure and morphology characterization is also discussed.

关键词： Carbon dioxide Low-alloy steel Corrosion behavior Microstructure

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Detrended Fluctuation Analysis on Correlations of Complex Networks Under Attack and Repair Strategy

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Communications in Theoretical Physics 2006年第4期45卷 765-768页

作者： chi Li-ping YANG Chun-Bin MAKe Cai Xu Institute of Particle Physics Huazhoag （Central China） Normal University Wuhan 430079 China

We analyze the correlation properties of the Erd6s-Rdnyi random graph （RG） and the Barabdsi-Albert scale-free network （SF） under the attack and repair strategy with detrended fluctuation analysis （DFA）. The maximum degree kmax, representing the local property of the system, shows similar scaling behaviors for random graphs and scale-free networks. The fluctuations are quite random at short time scales but display strong anticorrelation at longer time scales under the same system size N and different repair probability pre. The average degree 〈k〉, revealing the statistical property of the system, exhibits completely different scaling behaviors for random graphs and scale-free networks. Random graphs display long-range power-law correlations. Scale-free networks are uncorrelated at short time scales; while anticorrelated at longer time scales and the anticorrelation becoming stronger with the increase of pre.

关键词： correlations detrended fluctuation analysis complex networks

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An electrostatic spectral neighbor analysis potential for lithium nitride

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npj Computational Materials 2019年第1期5卷 508-515页

作者： Zhi Deng chi Chen Xiang-Guo Li Shyue ping Ong Department of NanoEngineering University of California San Diego9500 Gilman DrMail Code 0448La JollaCA 92093-0448USA

Machine-learned interatomic potentials based on local environment descriptors represent a transformative leap over traditional potentials based on rigid functional forms in terms of prediction ***,a challenge in their application to ionic systems is the treatment of long-ranged ***,we present a highly accurate electrostatic Spectral Neighbor Analysis Potential(eSNAP)for ionicα-Li3N,a prototypical lithium superionic conductor of interest as a solid electrolyte or coating for rechargeable lithium-ion *** show that the optimized eSNAP model substantially outperforms traditional Coulomb–Buckingham potential in the prediction of energies and forces,as well as various properties,such as lattice constants,elastic constants,and phonon dispersion *** also demonstrate the application of eSNAP in long-time,large-scale Li diffusion studies in Li3N,providing atomistic insights into measures of concerted ionic motion(e.g.,the Haven ratio)and grain boundary *** work aims at providing an approach to developing quantum-accurate force fields for multi-component ionic systems under the SNAP formalism,enabling large-scale atomistic simulations for such systems.

关键词： electrostatic lithium ionic

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In Situ Laser Coating of Calcium Phosphate on TC4 Surface for Enhancing Bioactivity

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Journal of Iron and Steel Research International 2007年第3期14卷 73-78页

作者： DENG chi WANG Yong ZHANG Ya-ping GAO Jia-cheng Department of Physics Leshan Teachers College Leshan 614004 Sichuan China School of Materials Science and Engineering Chongqing University Chongqing 400044 China

Titanium alloy has been a successful implant material owing to its excellent ratio of strength to weight, toughness, and bio-inert oxide surface. Significant progress has been made in improving the bioactivity of titanium alloy by coating its oxide surface with calcium phosphates. In the present study, in situ coating was reported on Ti6Al4V（TC4） surface with calcium phosphate （Ca-P） bioceramics synthesized and synchronously cladded by laser beam. This coating was grown by first preplacing directly the raw powders, which contain 80% of CaHPO4 · 2H2O, 20% of CaCO3, and dram of rare earth （RE）, on the TC4 surfaces, and then exposing the surfaces to the laser beam with a power density of 12. 73-15.27 MW · m^-2 and a scanning velocity of 10.5 m/s. The resultant coating was characterized using scanning electron microscopy （SEM）, X-ray diffraction （XRD）, thermogravimetric analysis and Different-thermal Scanning （TG-DSC）, and Energy Dispersive X-ray Detection （EDX）. The results show that these laser ceramics include hydroxyapatite （HA）, tricalcium phosphate （TCP）, Ca2 P2 O7, and other Ca-P phases, and the interface between the coating and the TC4 substrate has tighter fixation, in which the chemical bonding is approved. These laser hybrid coatings are useful in enhancing the bioactivity of titanium alloy surfaces.

关键词： titanium alloy surface calcium phosphate ceramics laser cladding bioactivity

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Video-assisted thoracoscopic surgery (VATS) for the treatment of hepatic hydrothorax:report of twelve cases

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第7期10卷 547-551页

作者： Shi-ping LUH chi-yi CHEN Vice Superintendent Department of Thoracic Surgery St Martin De Porres Hospital Chia-Yi 60069 Taiwan China Biomedical Information National Chiao-Tung University Hsin-Chu 30010 Taiwan China Department of Gastroenterology Chia- Yi Christian Hospital Chia- Yi 60013 Taiwan China

Background： Hepatic hydrothorax is defined as a significant pleural effusion in patients with liver cirrhosis and without underlying cardiopulmonary diseases. Treatment of hepatic hydrothorax remains a challenge at present. Methods： Herein we share our experiences in the treatment of 12 patients with hepatic hydrothorax by video-assisted thoracoscopic surgery （VATS） Repair of the diaphragmatic defects, or pleurodesis by focal pleurectomy, talc spray, mechanical abrasion, electro-cauterization or injection was administered intraoperatively, and tetracycline intrapleural injection was used postoperatively for patients with prolonged （〉7 d） high-output （〉300 ml/d） pleural effusion. Results： Out of the 12 patients, 8 （67%） had uneventful postoperative course and did not require tube for drainage more than 3 months after discharge. In 4 （33%） patients the pleural effusion still recurred after discharge due to end-stage cirrhosis with massive ascites. Conclusion： We conclude that the repair of the diaphragmatic defect and pleurodesis through VATS could be an alternative of transjugular intrahepatic portal systemic shunt （T1PS） or a bridge to liver transplantation for patients with refractory hepatic hydrothorax. Pleurodesis with electrocauterization can be an alternative therapy if talc is unavailable.

关键词： Hepatic hydrothorax Video-assisted thoracoscopic surgery (VATS) Pleurodesis

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