109 research outputs found
On the Bolotin's reduced beam model versus various boundary conditions
No full textThis paper is devoted to the construction of asymptotically correct simplified models of nonlinear beam equations for various boundary conditions. V.V. Bolotin mentioned that in some cases (e.g., if compressed load is near the buckling value), the so-called „nonlinear inertia“ must be taken into account. The effect of nonlinear inertia on the oscillations of the clamped-free beam is investigated in many papers. Bolotin used some physical assumption and did not compare the order of nonlinear terms in original equations. Below we propose our method for deriving those, which we will named “Bolotin's equations“. This approach is based on fractional analysis of original boundary value problems.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Mathematical Physic
Vibrations of multispan stiffened plates via modified Bolotin method
No full textAerospace Engineerin
The 2010 European Revascularisation Guidelines implementation: the Israeli cardiac surgeons’ perspective
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Dynamic Stability of Cables Subjected to an Axial Periodic Force
No full textIn this paper，theoretical solutions are reported for the dynamic stability of a flat-sag cable under an axial sinusoidally time-vallying force. This problem is solved by using the harmonic balance method described first by Bolotin and lately extended by the author. After presenting the problem in the eigenvalue form, numerical results are presented for dynamie unstable regions of the cable with various sag-to-span ratios and ratio of wave speeds
Robotics in Cardiac Surgery: Past, Present, and Future
No full textRobotic cardiac operations evolved from minimally invasive operations and offer similar theoretical benefits, including less pain, shorter length of stay, improved cosmesis, and quicker return to preoperative level of functional activity. The additional benefits offered by robotic surgical systems include improved dexterity and degrees of freedom, tremor-free movements, ambidexterity, and the avoidance of the fulcrum effect that is intrinsic when using long-shaft endoscopic instruments. Also, optics and operative visualization are vastly improved compared with direct vision and traditional videoscopes. Robotic systems have been utilized successfully to perform complex mitral valve repairs, coronary revascularization, atrial fibrillation ablation, intracardiac tumor resections, atrial septal defect closures, and left ventricular lead implantation. The history and evolution of these procedures, as well as the present status and future directions of robotic cardiac surgery, are presented in this review
Technological Solutions for Cardiac Surgery in the Elderly
No full textThe current review addresses contemporary technological advances in cardiac surgery performed on octogenarian patients, namely off-pump coronary artery bypass grafting (CABG), proximal anastomosis device, routine use of intraoperative epiaortic ultrasound, proximal anastomosis without clamping, transcatheter aortic valve implantation (TAVI), and brain protection during cardiac surgery
The Reach of the SEC Under Rule 10b-5 Is Further Restricted: Negligent Conduct Is Insufficient to Warrant Commission Instigated Injunctive Relief
No full textIn a recent decision the United States District Court for the Sourthern District of New York seemingly broke with Second Circuit precedent to hold that the SEC must prove scienter to get an injunction under Rule lOb-5. The author suggests that the district court\u27s decision is reconcilable with recent second Circuit decisions and presents reasons why the district court\u27s holding should be adopted by the Second Circuit
Surgical Therapy for Atrial Fibrillation
No full textSurgical treatment of atrial fibrillation grew out of positive experiences with arrhythmia surgery. The predilection to and occurrence of AF are related to a substrate, triggers and rotors. The encouraging, initial experiences with the cut-and-sew maze procedure, developed by Cox &Boineau essentially aimed to isolate the atria electrically into small areas by scar tissue made possible by cutting and sewing along a certain pattern. The premise of that this maze of scars would allow only normal impulses to move from the atria to the ventricles is the foundation. As technology has progressed, other energy sources such as radio-frequency ablation and cryo-ablation have been used to create scars. This chapter provides an overview of the surgical approaches to creating these scars in addressing atrial fibrillation and its consequences
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