نتایج جستجو برای: taper constant

تعداد نتایج: 221061  

2016
José Paulo Macedo Jorge Pereira Brendan R. Vahey Bruno Henriques Cesar A. M. Benfatti Ricardo S. Magini José López-López Júlio C. M. Souza

The aim of this study was to conduct a literature review on the potential benefits with the use of Morse taper dental implant connections associated with small diameter platform switching abutments. A Medline bibliographical search (from 1961 to 2014) was carried out. The following search items were explored: "Bone loss and platform switching," "bone loss and implant-abutment joint," "bone reso...

Journal: :international journal of advanced design and manufacturing technology 0
mahmoud moradi department of mechanical engineering, faculty of engineering, malayer university, malayer, iran alireza mohazab pak ali khorram department of mechanical engineering, k.n.toosi university of technology,p.o. box 19395-1999, tehran, iran

this study is focused on investigating the parameters of laser percussion drilling process of nickel-base super alloy inconel 718 with thickness of 1 mm. fiber laser with the power of 500 watts was used as the laser source. laser pulse frequency, duty cycle, laser power, focal point position, were assumed as the laser drilling process variables. the hole geometry features, i.e. entrance hole di...

Journal: :Optics letters 2002
A Talneau Ph Lalanne M Agio C M Soukoulis

We design and fabricate a new taper structure for adiabatic mode transformation in two-dimensional photonic-crystal waveguides patterned into a GaInAsP confining layer. The taper efficiency is validated by measurement of a reduction of the reflection between an access ridge and a photonic-crystal guide with one missing row from 6% to less than 1%. This taper is then incorporated into a 60 degre...

2015
Paul J Bills R Racasan

Measuring the amount of material loss in the case of revised hip replacements is considered to be a prerequisite of understanding and assessing the true in vivo performance of the implant. This paper outlines a method developed by the authors for quantifying taper material loss as well as more general taper interface parameters. Previous studies have mostly relied on visual inspection to assess...

2016
Lifeng Pang Yongpeng Ma Ram P. Sharma Xinyu Song Liyong Fu Eric J. Jokela

The segmented taper equation has great flexibility and is widely applied in exiting taper systems. The unconstrained least square regression (ULSR) was generally used to estimate parameters in previous applications of the segmented taper equations. The joint point parameters estimated with ULSR may fall outside the feasible region, which leads to the results of the segmented taper equation bein...

2001
Mukul Agrawal G. Singh P. K. Jain B. N. Basu

In this theoretical paper, the wide-band low-gain feature of a tapered smooth wall gyro-traveling wave tube (gyro-TWT) was combined with the low beam energy, low magnetic field, and high gain, though narrow band, feature of a vane loaded nontapered gyro-TWT, to propose a distributed, tapered vane loaded gyro-TWT for both high gains and wide bandwidths. The device was analyzed for the tapering o...

Journal: :Brain Stimulation 2023

Background: Pharmacological treatments routinely end with a taper and tapering final TMS is common. In large registry, we examined (1) the frequency nature of for MDD patients, (2) potential associations use acute phase antidepressant efficacy, (3) relations to likelihood timing retreatment due symptomatic worsening. Methods: NeuroStar Outcomes Registry, 7,640 patients were identified PHQ-9 sco...

Journal: :AJNR. American journal of neuroradiology 2016
A Thompson N Madan J R Hesselink G Weinstein A Munoz del Rio V Haughton

BACKGROUND AND PURPOSE The cause of syringomyelia in patients with Chiari I remains uncertain. Cervical spine anatomy modifies CSF velocities, flow patterns, and pressure gradients, which may affect the spinal cord. We tested the hypothesis that cervical spinal anatomy differs between Chiari I patients with and without syringomyelia. MATERIALS AND METHODS We identified consecutive patients wi...

Journal: :AJNR. American journal of neuroradiology 2014
Z Zhu S Sha X Sun Z Liu H Yan W Zhu Z Wang Y Qiu

BACKGROUND AND PURPOSE Steeper tapering of the cervical spinal canal as documented in recent studies is thought to have a role in the pathophysiology of Chiari malformation-associated syringomyelia. This study aimed to determine whether taper ratio of the cervical spinal canal differs between patients with distended and nondistended syringes. MATERIALS AND METHODS Seventy-seven adolescents (1...

Journal: :Optics express 2016
Alexandre Horth Pavel Cheben Jens H Schmid Raman Kashyap Nathaniel J Quitoriano

Coupling light between an optical fiber and a silicon nanophotonic waveguide is a challenge facing the field of silicon photonics to which various mode converters have been proposed. Inverted tapers stand out as a practical solution enabling efficient and broadband mode conversion. Current design approaches often use linearly-shaped tapers and two dimensional approximations; however, these appr...

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