Results 1 to 10 of about 4,930,166 (237)
Period annulus of the harmonic oscillator with zero cyclicity under perturbations with a homogeneous polynomial field [PDF]
Electronic Journal of Qualitative Theory of Differential Equations, 2019 In this work we prove, using averaging theory at any order in the small perturbation parameter, that the period annulus of the harmonic oscillator has cyclicity zero (no limit cycles bifurcate) when it is perturbed by any fixed homogeneous polynomial ...
Isaac García, Susanna Maza
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EntomoBrasilis, 2016 O objetivo deste trabalho foi realizar novo registro de ocorrência para Ischnocodia annulus (Fabricius), além de fornecer informações sobre plantas hospedeiras e período de ocorrência da espécie.
Marta Custodio Lopes +1 more
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Fifteen Limit Cycles Bifurcating from a Perturbed Cubic Center
Discrete Dynamics in Nature and Society, 2021 In this work, we study the bifurcation of limit cycles from the period annulus surrounding the origin of a class of cubic polynomial differential systems; when they are perturbed inside the class of all polynomial differential systems of degree six, we ...
Amor Menaceur +3 more
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Rare Giant Goronary Sinus Aneurysm with Aortic Dissection: A Case Report [PDF]
Advanced Ultrasound in Diagnosis and Therapy, 2020 Aortic sinus aneurysm is a rare congenital malformation. During the embryonic period, dysplasia occurs in the middle elastic fiber of the aortic sinus wall and insufficient fusion occurs in the aortic valve annulus.
Jing Ma, PhD, Tao Ma, MD, Jianmin Lu, MD, Xiangke Ma, PhD
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Early differentation of lamellar structure of the intervertebral disc in staged human embryos
Journal of Medical Science, 2015 Introduction. In the vast literature concerning the development of the intervertebral discs controversies exist as to the period of differentiation and structure of the nucleus pulposus and annulus fibrosus.
Witold Woźniak +7 more
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The Egyptian Heart Journal, 2014 The development of ischemic mitral regurgitation (MR) after myocardial infarction (MI) may impose hemodynamic load during a period of active left ventricular remodeling and promote heart failure (HF). The aim of our study was to evaluate left ventricular
Ayman Ahmed Abdelaziz, Eid M. Daoud
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Period functions and critical periods of piecewise linear system
Electronic Journal of Differential Equations, 2020 In this article, we study a rich and complex phenomena of planar piecewise linear systems having two domains of which the separation curves are not straight.
Shaoqing Wang, Jiazhong Yang
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Российский кардиологический журнал, 2022 Aim. To evaluate changes of left ventricular (LV) diastolic function in patients with multivessel coronary artery disease before coronary artery bypass grafting (CABG) and in the early postoperative period (7-10 days), as well as to assess the relation ...
A. R. Mingalimova +6 more
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Shiyou jixie, 2022 At present,shale oil development mostly adopts stimulated reservoir volume of long horizontal wells for reservoir stimulation.For horizontal well development in oil and gas reservoirs,in order to study the effect of cyclic loading during stimulated ...
Xu Xinniu +6 more
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Aortic prosthetic size predictor in aortic valve replacement
Journal of Cardiothoracic Surgery, 2021 Background Patient-prosthesis mismatch (PPM) is a major concern in aortic valve replacement (AVR) and leads to perioperative morbidity and rehospitalization.
Anh Tuan Vo +6 more
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