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Sacroiliac joint stability: Finite element analysis of implant number, orientation, and superior implant length

World Journal of Orthopedics 2018年第3期9卷 14-23页

作者： Derek p Lindsey Ali Kiapour Scott A Yerby Vijay K Goel Research and Development SI-BONE Inc. Engineering Center for Orthopaedic Research Excellence Departments of Bioengineering and Orthopaedic Surgery Colleges of Engineering and MedicineUniversity of Toledo

AIM To analyze how various implants placement variables affect sacroiliac(SI) joint range of motion. METHODS An experimentally validated finite element model of the lumbar spine and pelvis was used to simulate a fusion of the SI joint using various placement configurations of triangular implants(iF use Implant System~?). placement configurations were varied by changing implant orientation, superior implant length, and number of implants. The range of motion of the SI joint was calculated using a constant moment of 10 N-m with a follower load of 400 N. The changes in motion were compared between the treatment groups to assess how the different variables affected the overall motion of the SI joint. RESULTS Transarticular placement of 3 implants with superior implants that end in the middle of the sacrum resulted in the greatest reduction in range of motion(flexion/extension = 73%, lateral bending = 42%, axial rotation = 72%). The range of motions of the SI joints were reduced with use of transarticular orientation(9%-18%) when compared with an inline orientation. The use of a superior implant that ended mid-sacrum resulted in median reductions of(8%-14%) when compared with a superior implant that ended in the middle of the ala. Reducing the number of implants, resulted in increased SI joint range of motions for the 1 and 2 implant models of 29%-133% and 2%-39%, respectively,when compared with the 3 implant *** Using a validated finite element model we demonstrated that placement of 3 implants across the SI joint using a transarticular orientation with superior implant reaching the sacral midline resulted in the most stable construct. Additional clinical studies may be required to confirm these results.

关键词： Fusion Biomechanics Minimally invasive surgery Sacroiliac joint dysfunction Finite element analysis

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The Boy is Gone

The Boy is Gone

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作者： (1982-)Huttenbach Laura Lee p.

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A New Buck-Based Configuration AC Chopper Voltage Conditioner

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Journal of Systems Engineering and Electronics 2001年第2期12卷 36-43页

作者： Tang Fuliang, Xiong Youlun & Ma Jianfeng Huazhong University of Science and Technology, Wuhan 430074, p. R. China Huazhong University of Science and Technology Wuhan 430074 P. R. China

This paper presents a new AC chopper voltage conditioner, which can generate high quality sinusoidal waveforms with adjustable amplitudes. The circuit structure, operation principle, and control mode are analyzed in detail, the system essentially consisting of an equal duty cycle modulation AC voltage buck chopper and a voltage polarity change H-bridge, a full-wave rectifier, to perform tightly closed-loop control of the AC chopper voltage condtioner, a digital controller on a new converter model has been developed. The controller has very well dynamic response. To evaluate the new circuit and proposed control scheme, a 5kW conditioner is developed and the experimental results demonstrate that the system has good performances.

关键词： Voltage conditioner Equal duty cycle modulation power supply.

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Thrombotic Venous Diseases of the Liver

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Journal of Clinical and Translational Hepatology 2015年第3期3卷 189-194页

作者： Timothy p.Sabol Marco Molina George Y.Wu Department of Graduate Medical Education Eastern Connecticut Health Network Manchester Memorial Hospital Manchester CT USA Department of Radiology University of Connecticut Health Center Farmington CT USA Department of Medicine Division of Gastroenterology-Hepatology University of Connecticut Health Center Farmington CT USA

Thrombotic venous diseases of the liver do not occur frequently,but when they do,they can present as difficult diagnostic and therapeutic *** aim of this article is to review the epidemiology,pathogenesis,diagnosis,an... 详细信息

关键词： Thrombosis Hepatic veins portal hypertension

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Isometric Immersions into Warped product Spaces

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Acta Mathematica Sinica,English Series 2010年第12期26卷 2269-2282页

作者： Qun CHEN Cai Rong XIANG~1) School of Mathematics and Statistics, Wuhan University, Wuhan 430072, p.R. China School of Mathematics and Statistics Wuhan University Wuhan P. R. China

This paper concerns the submanifold geometry in the ambient space of warped productmanifolds F^n×σ R, this is a large family of manifolds including the usual space forms R^m, S^m and H^m. We give the fundamental theorem for isometric immersions of hypersurfaces into warped product space R^n×σ R, which extends this kind of results from the space forms and several spaces recently considered by Daniel to the cases of infinitely many ambient spaces.

关键词： Isometric immersion hypersurface warped product the fundamental theorem

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Guided Modes of Hollow Optical Fiber Based Components: Analytical Solutions

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光学学报 2003年第S1期23卷 159-160页

作者： p. Roy Chaudhuri C. Lu W. Xiaoyan Institute for Infocomm Research Unit 230 Innovation Centre Block 2 18 Nanyang Drive Singapore 637723Institute for Infocomm Research Unit 230 Innovation Centre Block 2 18 Nanyang Drive Singapore 637723 School of Electrical and Electronics Engineering Nanyang Technological University Singapore 639798.School of Electrical and Electronics Engineering Nanyang Technological University Singapore 639798.

Guided modes in a hollow optical fiber are investigated using both scalar approximation and exact vectorial analysis. Effective indices of modes are seen to exhibit "nearly degenerate" groups. Besides providing an insight of modal characteristics, the analysis would prove to be useful to define design parameters for realizing components based on these fibers, and to explore new possibilities.

关键词： mode in on for of Guided Modes of Hollow Optical Fiber Based Components Analytical Solutions

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TOEpLITZ-HANKEL TYpE OpERATORS ON pRODUCT SpACES

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Analysis in Theory and Applications 1993年第2期9卷 9-23页

作者： Jiang Qingtang peking University. p. R. China Department of Mathematics Peking University Beijing P. R. China

Via a series of orihogonal two-dimensional wavelets, an orthogonal decomposition of the space of square integral functions on Ux U (U is the upper half-plane) with the meaaure y_1^(_1) y_2~(_2 dx_1 dx_2 dy_1 dy_2 is given. Four kinds of Toeplitz-Hankel type operators between the decomposition components are defined and boundedness. S_p properties of them are established.

关键词： TOEpLITZ-HANKEL TYpE OpERATORS ON pRODUCT SpACES Math

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predictors of microsurgical varicocelectomy efficacy in male infertility treatment:critical assessment and systematization

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Asian Journal of Andrology 2023年第1期25卷 21-28页

作者： Azizbek B Shomarufov Vladimir A Bozhedomov Nikolay I Sorokin Igor p Matyukhov Abdukodir A Fozilov Shukhrat A Abbosov Armais A Kamalov Department of Urology and Andrology Faculty of Fundamental MedicineLomonosov Moscow State UniversityMoscow 119991Russia Department of Urology Tashkent Medical AcademyTashkent 100109Uzbekistan Republican Specialized Scientific-practical Medical Center of Urology Tashkent 100109Uzbekistan

In this review,we tried to systematize all the evidence(from pubMed[MEDLINE],Scopus,Cochrane Library,EBSCO,Embase,and Google Scholar)from 1993 to 2021 on the predictors of microsurgical varicocelectomy efficacy in male infertility *** the outcomes of varicocele repair,we considered semen improvement and pregnancy and analyzed them *** on the 2011 Oxford CEBM Levels of Evidence,we assigned a score to each trial that studied the role of the *** systematized the studied predictors based on the total points,which were,in turn,calculated based on the number and quality of studies that confirmed or rejected the studied predictor as significant,into three levels of significance:predictors of high,moderate,and low clinical *** total motile sperm count(TMSC)coupled with sperm concentration can be a significant predictor of semen improvement and pregnancy after *** addition,for semen improvement alone,scrotal Doppler ultrasound(DUS)parameters,sperm DNA fragmentation index(DFI),and bilateral varicocelectomy are reliable predictors of microsurgical varicocelectomy efficacy.

关键词： male infertility microsurgical varicocelectomy predictor pregnancy semen varicocele

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Evaluation of physical and mechanical properties of AZ91D/SiC composites by two step stir casting process

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Journal of Magnesium and Alloys 2015年第1期3卷 52-62页

作者： S.Aravindan p.V.Rao K.ponappa Department of Mechanical Engineering Indian Institute of Technology-DelhiDelhi 110016India Department of Mechanical Engineering Kongu Engineering CollegePerundurai 638052India

Magnesium alloy(AZ91D)composites reinforced with silicon carbide particle with different volume percentage were fabricated by two step stir casting *** effect of changes in particle size and volume fraction of SiC particles on physical and mechanical properties of composites were evaluated under as cast and heat treated(T6)*** experimental results were compared with the standard theoretical *** results reveal that the mechanical properties of composites increased with increasing SiC particles and decrease with increasing particle *** of particles and fractured surface were studied through SEM and the presence of elements is revealed by EDS study.

关键词： Magnesium alloy Metal-matrix composites(MMCs) Mechanical properties Casting Fractography

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Chaotic phenomena in the Transition of the Laminar Separated Shear Layer from Order to Chaos

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Communications in Nonlinear Science and Numerical Simulation 1996年第3期1卷 1-4页

作者： Yufei DONG & Zhonglei WEI Cheng XU Xiaoqing JIANG:(Dept. of Mechanics & Engi. Sci., peking Univ., Beijing 100871. p.R.China)(College of Mech. Engi., Naning Univ., Naning 210094, p.R, China)(Navy Academy 0f Engi., Wuhan 430034, p.R. China) Dept. of Mechanics & Engi. Sci. Peking Univ. Beijing 100871. P.R. China

The transition of the laminar separated shear layer is invstigated from nonlinear dyuamics, and the diagnose parameters on chaos are calculated. The results demonstratethat the transition of the laminar separated shea... 详细信息

关键词： chaos separated shear layer transition

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