نتایج جستجو برای: torsional test
تعداد نتایج: 818241 فیلتر نتایج به سال:
PURPOSE To study the effect of torsional phacoemulsification energy on corneal endothelium evaluating the relationship between changes of endothelial cells and postoperative visual acuity. METHODS This prospective clinical observational cohort study included 50 patients with cataract who underwent torsional phacoemulsification. Sequential quantitative and qualitative morphometric endothelial ...
Proper force calibration is a critical step in atomic and lateral force microscopies (AFM/LFM). The recently published torsional Sader method [C. P. Green et al., Rev. Sci. Instrum. 75, 1988 (2004)] facilitates the calculation of torsional spring constants of rectangular AFM cantilevers by eliminating the need to obtain information or make assumptions regarding the cantilever's material propert...
The efficacy of rotational control designs in promoting torsional stability of hip fracture fixation
OBJECTIVES Fractures of the proximal femur are a common clinical problem, and a number of orthopaedic devices are available for the treatment of such fractures. The objective of this study was to assess the rotational stability, a common failure predictor, of three different rotational control design philosophies: a screw, a helical blade and a deployable crucifix. METHODS Devices were compar...
The capacity for short-term adaptation is a well-established property of the horizontal (H) and vertical (V) components of saccades. It allows these directional components, which clearly serve the goal of foveation, to maintain their precision even under changing circumstances. Torsional (T) saccade components, on the other hand, which deal with the orientation of the target on the fovea, have ...
A COMPARISON OF TORSIONAL STRESS PROPERTIES OF THREE DIFFERENT NICKEL-TITANIUM FILES WITH SIMILAR CROSS-SECTIONAL DESIGN Reid C. Wycoff D.D.S. Marquette University, 2012 The purpose of this study was to compare the in vitro torsional stress characteristics of Twisted Files (SybronEndo, Orange, CA) with two milled files of similar cross section, EndoSequence (Brasseler USA, Savannah, GA) and Pro...
PURPOSE To compare torsional versus combined torsional and conventional ultrasound modes in hard cataract surgery regarding ultrasound energy and time and effect on corneal endothelium. SETTINGS Kasr El Aini hospital, Cairo University, and International Eye Hospital, Cairo, Egypt. METHODOLOGY Ninety-eight eyes of 63 patients were enrolled in this prospective comparative randomized masked cl...
PURPOSE Exotropia in congenital homonymous hemianopia has been reported to provide field expansion that is more useful when accompanied with harmonious anomalous retinal correspondence (HARC). Torsional strabismus with HARC provides a similar functional advantage. In a subject with hemianopia demonstrating a field expansion consistent with torsion, we documented torsional strabismus and torsion...
PURPOSE To analyze temperature increases and identify potential sources of heat generated when sleeved and sleeveless phacoemulsification probes were operated in axial and torsional modes using the Infiniti Vision System with the Ozil torsional handpiece. SETTING Phacodynamics Laboratory, Pasteur Ophthalmic Clinic, Santiago, Chile. DESIGN Experimental study. METHODS Two computer-controlle...
I would like to present our experiences with torsional and micro-coaxial technology on behalf of our French research group. My goal is to demonstrate to surgeons the transition from performing phacoemulsification with traditional longitudinal ultrasound to a micro-coaxial procedure using torsional technology. The impetus for the development of micro-incisional phacoemulsification was to provide...
Torsional harmonic cantilevers allow measurement of time-varying tip-sample forces in tapping-mode atomic force microscopy. Accuracy of these force measurements is important for quantitative nanomechanical measurements. Here we demonstrate a method to convert the torsional deflection signals into a calibrated force wave form with the use of nonlinear dynamical response of the tapping cantilever...
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