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Growth in solution of hooked Ni–Fe fibers by oriented rotation and attachment approaches

International Journal of Minerals,Metallurgy and Materials 2016年第4期23卷 466-473页

作者： Yong Zhang Fang Liu Wei-ze Zhang School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028China The Eighteenth Bureau of Chinese Railway Co.Ltd. Guiyang 561000China

Inspired by the curved branches of fractal trees, hooked Ni–Fe fibers were grown in situ in Ni–Fe composite coatings on a spheroidal graphite cast iron substrate. These hooked Ni–Fe fibers exhibited inclination angles of about 39°, which was in accordance with the theoretical prediction of 37°. Ni–Fe nanostructures self-assembled to form dendrites and evolved into hooked fibers by an oriented attachment reaction. The orientation rotation of Ni–Fe nanostructures played an important role in the growth of curved hooked Ni–Fe fibers. During sliding wear tests, the volume loss of the spheroidal graphite cast iron substrate was 2.2 times as large as that of the Ni–Fe coating reinforced by hooked fibers. The good load-transferring ability of hooked Ni–Fe fibers led to an improvement in their wear properties during wear tests.

关键词： metal fiber fiber growth oriented attachments composite coatings self assembly nanostructures

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Free vibration of a sagged cable with attached discrete elements

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Applied Mathematics and Mechanics(English Edition) 2019年第5期40卷 631-648页

作者： W.PAKOS Faculty of Civil Engineering Wroc law University of Science and Technology

An algorithm is presented to analyze the free vibration in a system composed of a cable with discrete elements, e.g., a concentrated mass, a translational spring, and a harmonic oscillator. The vibrations in the cable are modeled and analyzed with the Lagrange multiplier formalism. Some fragments of the investigated structure are modeled with continuously distributed parameters, while the other fragments of the structure are modeled with discrete elements. In this case, the linear model of a cable with a small sag serves as a continuous model, while the elements, e.g., a translational spring, a concentrated mass, and a harmonic oscillator, serve as the discrete elements. The method is based on the analytical solutions in relation to the constituent elements, which, when once derived, can be used to formulate the equations describing various complex systems compatible with an actual structure. The numerical analysis shows that, the method proposed in this paper can be successfully used to select the optimal parameters of a system composed of a cable with discrete elements, e.g., to detune the frequency resonance of some structures.

关键词： free vibration sagged cable with attachments continuous discrete model

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Effect of 3D anchorage attachment on the alleviating tipping/extrusion of premolars for en-mass distalization of maxillary molars with clear aligners:A finite element study

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Medicine in Novel Technology and Devices 2023年第2期18卷 272-280页

作者： Lurong Jia Chunjuan Wang Yao He Chao Wang Antonio Apicella Jinlin Song Yubo Fan Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences ChongqingChina Stomatological Hospital of Chongqing Medical University ChongqingChina Key Laboratory of Biomechanics and Mechanobiology Ministry of EducationBeijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringSchool of Engineering MedicineBeihang UniversityBeijingChina Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education ChongqingChina Polytechnique School of Engineering and Base Science University of CampaniaItaly

This study aimed to explore the optimal invisible orthodontic force system during the en-mass distalization of two maxillary molars to minimize the side effect of anchorage loss by changing the direction of the application of the orthodontic force system.A high bio-fidelity 3D finite element model including maxilla,periodontal ligament,dentition,clear aligner,3D anchorage attachment and mini-implant was *** lengths of lateral hooks of 3D-printed anchorage attachments and mini-implant positions into the palatal alveolus were considered.A 200 g distal force was applied to the lateral hooks of different horizontal lengths(3.26 mm,6.52 mm and 9.78 mm)with the mini-implant as the application *** ABAQUS software,orthodontic tooth movements under 12 different clinical treatment designs were analyzed and *** 3D anchorage attachment enhanced the anchorage of anterior teeth and alleviated the tipping/extrusion of *** contrast to without clear aligners,length of the lateral hook had a negligible effect on both mesial tipping and buccal tipping with clear aligners,which could then be *** change in mesial tipping was less and nearly remained constant despite of the different heights of the *** 3D anchorage attachment assisted clear aligner can avoid the side effects of anterior tooth proclination caused by insufficient *** length of the lateral hook,and height of the mini-implant in this invisible orthodontic force system hardly affects the tooth movement of anchorage *** aligners can effectively control the rotation and tipping of anchorage units caused by 3D anchorage attachment.

关键词： Clear aligner Orthodontics 3D printing Three-dimensional finite element attachments Reinforced anchorage

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Endoscopic submucosal dissection for removal of superficial gastrointestinal neoplasms: A technical review

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World Journal of Gastrointestinal Endoscopy 2012年第4期4卷 123-136页

作者： Noriaki Matsui Kazuya Akahoshi Kazuhiko Nakamura Eikichi Ihara Hiroto Kita Department of Gastroenterology and Hepatology National Hospital Organization Fukuoka Higashi Medical Center Koga 811-3195 Japan Department of Gastroenterology Aso Iizuka Hospital Iizuka 820-8505 Japan Department of Medicine and Bioregulatory Science Graduate School of Medical Sciences Kyushu University Fukuoka 812-8582 Japan Department of Gastroenterology Saitama Medical University International Medical Center Hidaka 350-1298 Japan

Endoscopic submucosal dissection (ESD) is now the most common endoscopic treatment in Japan for intramucosal gastrointestinal neoplasms (non-metastatic). ESD is an invasive endoscopic surgical procedure, requiring extensive knowledge, skill, and specialized equipment. ESD starts with evaluation of the lesion, as accurate assessment of the depth and margin of the lesion is essential. The devices and strategies used in ESD vary, depending on the nature of the lesion. Prior to the procedure, the operator must be knowledgeable about the treatment strategy(ies), the device(s) to use, the electrocautery machine settings, the substances to inject, and other aspects. In addition, the operator must be able to manage complications, should they arise, including immediate recognition of the complication(s) and its treatment. Finally, in case the ESD treatment is not successful, the operator should be prepared to apply alternative treatments. Thus, adequate knowledge and training are essential to successfully perform ESD.

关键词： attachments Complication Endoscope Electrosurgical unit Endoscopic submucosal dissection Endoscopic submucosal dissection device Injection agent Sedation Training

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Research on the Materials and Production Process of Low Odor and Environmental Automotive Sealing Strips

Research on the Materials and Production Process of Low Odor...

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2018中国汽车工程学会年会

作者： WEI Shuchen ZHU Yi FAW

To improve the air quality in an automotive cab,after analyzing each impact from materials and production process of automotive sealing strips,we confirm the harmful ingredients in each additive and c

关键词： automotive sealing strips odor additives production process attachments

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