نتایج جستجو برای: flutter phenomena

تعداد نتایج: 124224  

Journal: :international journal of civil engineering 0
m.e. torki phd student, zachry department of civil engineering, texas a&m university, college station, tx 77843, usa m. taghi kazemi associate professor, department of civil engineering, sharif university of technology, tehran, islamic republic of iran s.b. talaeitaba assistant professor of azad university, department of civil engineering, khomeinishahr azad university, isfahan, islamic republic of iran

the effect of axial deformation of shell particles on the dynamic instability (flutter) of cantilevered cylindrical shells made of functionally graded materials (fgm) under an end axial follower force is addressed. to this end, at first, results for free vibration of fgm cylindrical shells were verified with previous outcomes and they were in very good agreement. then, the effect of axial defor...

Journal: :IPOL Journal 2015
Yohann Tendero

The goal of the flutter shutter is to make uniform motion blur invertible, by a “fluttering” shutter that opens and closes on a sequence of well chosen sub-intervals of the exposure time interval. In other words, the photon flux is modulated according to a well chosen sequence called flutter shutter code. This article provides a numerical method that computes optimal flutter shutter codes in te...

2005
Flavia Ravelli Fulvio Cozzi Maurits A. Allessie

Background Slight variation in cycle lengths of common and rapid atrial flutter in humans is an established phenomenon, but its mechanisms have not been completely clarified. In a previous study, we demonstrated that in common atrial flutter the variations in atrial cycle length were due to atrial stretch affecting the revolution time of a reentrant circuit. In the present study, we investigate...

2005
Akihiko Shimizu Akira Nozaki

Background. We report that rapid atrial pacing interrupts atrial flutter when the orthodromic wave front from the pacing impulse is blocked in an area of slow conduction in the reentry circuit. To characterize the area of slow conduction during atrial flutter and rapid pacing, we studied 11 episodes of induced atrial flutter, mean cycle length 157+±20 msec, in eight dogs with sterile pericardit...

2003
Arindam Gan Chowdhury Partha P. Sarkar

The prediction of flutter instability is of major concern for design of flexible structures. This necessitates the identification of aeroelastic parameters, known as flutter derivatives from wind tunnel experiments. The extraction of flutter derivatives becomes more challenging when the number of degrees of freedom (DOF) increases from two to three. Since the work in the field of identifying al...

2017
Rohan R. Mahale Anish Mehta Kiran Buddaraju Rangasetty Srinivasa

Ocular flutter is an eye movement disorder characterized by purely horizontal rapid saccadic oscillations lasting for a few minutes which stops spontaneously. Postinfectious ocular flutter and truncal ataxia are a rare entity. There are reported cases of opsoclonus myoclonus ataxia in association with dengue virus infection. However, there are no reported cases of parainfectious ocular flutter ...

Journal: :The Journal of experimental biology 2015
Christopher J Clark Richard O Prum

Tonal, non-vocal sounds are widespread in both ordinary bird flight and communication displays. We hypothesized these sounds are attributable to an aerodynamic mechanism intrinsic to flight feathers: aeroelastic flutter. Individual wing and tail feathers from 35 taxa (from 13 families) that produce tonal flight sounds were tested in a wind tunnel. In the wind tunnel, all of these feathers could...

Journal: :The Journal of experimental biology 2013
Christopher J Clark Damian O Elias Madeline B Girard Richard O Prum

Feathers can produce sound by fluttering in airflow. This flutter is hypothesized to be aeroelastic, arising from the coupling of aerodynamic forces to one or more of the feather's intrinsic structural resonance frequencies. We investigated how mode of flutter varied among a sample of hummingbird tail feathers tested in a wind tunnel. Feather vibration was measured directly at ~100 points acros...

2008
Xinzhong Chen Ahsan Kareem

This study identifies the control parameters which critically influence the development of intermodal coupling and the generation of aerodynamic damping, based on closed-form solutions of bimodal coupled analysis of bridge aerolastic system. This information helps in developing a guideline for the selection of most critical structural modes in a coupled flutter analysis and in better interpreta...

Journal: :British heart journal 1995
M P van den Berg H J Crijns B M Szabó J Brouwer K I Lie

OBJECTIVE To examine the effect of exercise on cycle length in atrial flutter. PATIENTS 15 patients with chronic atrial flutter. Seven patients were taking digoxin and six verapamil; two were not taking medication. METHODS All patients underwent bicycle ergometry. Flutter cycle length was measured at rest and at peak exercise. RESULTS Mean flutter cycle length increased from 245 ms to 256...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید