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https://www.readbyqxmd.com/read/29342178/chaos-and-multi-scroll-attractors-in-rcl-shunted-junction-coupled-jerk-circuit-connected-by-memristor
#1
Jun Ma, Ping Zhou, Bashir Ahmad, Guodong Ren, Chunni Wang
In this paper, a new four-variable dynamical system is proposed to set chaotic circuit composed of memristor and Josephson junction, and the dependence of chaotic behaviors on nonlinearity is investigated. A magnetic flux-controlled memristor is used to couple with the RCL-shunted junction circuit, and the dynamical behaviors can be modulated by changing the coupling intensity between the memristor and the RCL-shunted junction. Bifurcation diagram and Lyapunov exponent are calculated to confirm the emergence of chaos in the improved dynamical system...
2018: PloS One
https://www.readbyqxmd.com/read/29341976/cone-beam-ct-assessment-of-the-position-of-the-medial-lingual-foramen-for-dental-implant-placement-in-the-anterior-symphysis
#2
Arturo Sanchez-Perez, Paula Boix-Garcia, Pía Lopez-Jornet
OBJECTIVES: To determine the position of the mandibular medial lingual foramen with cone-beam CT (CBCT) 3D imaging modalities when implants are to be placed in the anterior symphysis of the mandible. MATERIALS AND METHODS: A total of 111 CBCTs were considered acceptable and analyzed. The variables measured were as follows: (1) length of the outlet duct; (2) distance from the canal to the buccal cortex; (3) distance from the canal to the inferior cortex; (4) distance from the canal to the lingual cortex; (5) distance from the canal to the alveoli of the nearest tooth in dentate patients and distance from the canal to the marginal crest in edentulous patients; (6) angle of the duct to the horizontal Frankfurt plane; (7) diameter of the exit orifice; and (8) output level of the socket in relation to the teeth and the presence of bifurcations...
January 16, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29341611/moving-boundary-truncated-grid-method-for-wave-packet-dynamics
#3
Tsung-Yen Lee, Chia-Chun Chou
The moving boundary truncated grid method is developed to significantly reduce the number of grid points required for wave packet propagation. The time-dependent Schrodinger equation (TDSE) and the imaginary time Schrodinger equation (ITSE) are integrated using an adaptive algorithm which economizes on the number of grid points. This method employs a variable number of grid points in the Eulerian frame (grid points fixed in space) and adaptively defines the boundaries of the truncated grid. The truncated grid method is first applied to the time integration of the TDSE for the photodissociation dynamics of NOCl and a three-dimensional quantum barrier scattering problem...
January 17, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29340277/comparative-computed-flow-dynamic-analysis-of-different-optimization-techniques-in-left-main-either-provisional-or-culotte-stenting
#4
Gianluca Rigatelli, Fabio Dell'Avvocata, Marco Zuin, Sara Giatti, Khanh Duong, Trung Pham, Nguyen Si Tuan, Dobrin Vassiliev, Ramesh Daggubati, Thach Nguyen
Background and Objectives: Provisional and culotte are the most commonly used techniques in left main (LM) stenting. The impact of different post-dilation techniques on fluid dynamic of LM bifurcation has not been yet investigated. The aim of this study is to evaluate, by means of computational fluid dynamic analysis (CFD), the impact of different post-dilation techniques including proximal optimization technique (POT), kissing balloon (KB), POT-Side-POT and POT-KB-POT, 2-steps Kissing (2SK) and Snuggle Kissing balloon (SKB) on flow dynamic profile after LM provisional or culotte stenting...
December 2017: Journal of Translational Internal Medicine
https://www.readbyqxmd.com/read/29339516/human-airway-branch-variation-and-chronic-obstructive-pulmonary-disease
#5
Benjamin M Smith, Hussein Traboulsi, John H M Austin, Ani Manichaikul, Eric A Hoffman, Eugene R Bleecker, Wellington V Cardoso, Christopher Cooper, David J Couper, Stephen M Dashnaw, Jia Guo, MeiLan K Han, Nadia N Hansel, Emlyn W Hughes, David R Jacobs, Richard E Kanner, Joel D Kaufman, Eric Kleerup, Ching-Long Lin, Kiang Liu, Christian M Lo Cascio, Fernando J Martinez, Jennifer N Nguyen, Martin R Prince, Stephen Rennard, Stephen S Rich, Leora Simon, Yanping Sun, Karol E Watson, Prescott G Woodruff, Carolyn J Baglole, R Graham Barr
Susceptibility to chronic obstructive pulmonary disease (COPD) beyond cigarette smoking is incompletely understood, although several genetic variants associated with COPD are known to regulate airway branch development. We demonstrate that in vivo central airway branch variants are present in 26.5% of the general population, are unchanged over 10 y, and exhibit strong familial aggregation. The most common airway branch variant is associated with COPD in two cohorts (n = 5,054), with greater central airway bifurcation density, and with emphysema throughout the lung...
January 16, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29339138/hyperglycaemia-disrupts-conducted-vasodilation-in-the-resistance-vasculature-of-db-db-mice
#6
Hamish A L Lemmey, Xi Ye, Hong Ding, Chris R Triggle, Christopher J Garland, Kim A Dora
Vascular dysfunction in small resistance arteries is observed during chronic elevations in blood glucose. Hyperglycaemia-associated effects on endothelium-dependent vasodilation have been well characterized, but effects on conducted vasodilation in the resistance vasculature are not known. Small mesenteric arteries were isolated from healthy and diabetic db/db mice, which were used as a model of chronic hyperglycaemia. Endothelium-dependent vasodilation via the Gq/11-coupled proteinase activated receptor 2 (PAR2) was stimulated with the selective agonist SLIGRL...
January 12, 2018: Vascular Pharmacology
https://www.readbyqxmd.com/read/29339054/the-dynamics-of-vector-borne-relapsing-diseases
#7
Cody Palmer, Erin Landguth, Emily Stone, Tammi Johnson
In this paper, we describe the dynamics of a vector-borne relapsing disease, such as tick-borne relapsing fever, using the methods of compartmental models. After some motivation and model description we provide a proof of a conjectured general form of the reproductive ratio R0, which is the average number of new infections produced by a single infected individual. A disease free equilibrium undergoes a bifurcation at R0=1 and we show that for an arbitrary number of relapses it is a transcritical bifurcation with a single branch of endemic equilibria that is locally asymptotically stable for R0 sufficiently close to 1...
January 12, 2018: Mathematical Biosciences
https://www.readbyqxmd.com/read/29338729/computational-study-of-the-effects-of-arterial-bifurcation-on-the-temperature-distribution-during-cryosurgery
#8
Yong-Chang Zheng, Jun-Hong Wu, Zhi-Zhu He, Shao-Jiong Huang
BACKGROUND: Thermally significant blood flows into locally cooled diseased tissues and warm them during cryosurgery so that the iceball is often hard to cover the whole diseased volume. This paper is aimed at investigating the effects of large arterial bifurcation on the temperature distribution during cryosurgery through simulation method. METHODS: A parametric geometry model is introduced to construct a close-to-real arterial bifurcation. The three-dimensional transient conjugate heat transfer between bifurcated artery and solid tissues with phase change during cryosurgery is performed by finite volume method...
January 16, 2018: Biomedical Engineering Online
https://www.readbyqxmd.com/read/29336945/current-treatment-of-significant-left-main-coronary-artery-disease-a-review
#9
REVIEW
Mariama Akodad, Marie-Claude Morice
Though infrequent, left main stenosis has a major prognostic impact. The management of left main disease has evolved over the last few decades with the growing evidence of the efficacy and safety of percutaneous interventions, as attested by the most recent trials. However, mastery of the technical aspects of left main bifurcation stenting is essential in ensuring optimal results. This review focuses on recent data concerning left main angioplasty results as well as the current technical approaches.
January 5, 2018: Trends in Cardiovascular Medicine
https://www.readbyqxmd.com/read/29336309/dedicated-bifurcated-balloon-for-coronary-bifurcation-lesions-a-pre-clinical-proof-of-concept
#10
Khalid Al-Saadon, Ghassan S Kassab, Gerard Finet, Rodrigo Bagur
AIMS: To address the limitations of the two-balloon system for kissing balloon inflation (KBI) for the treatment of coronary bifurcation lesions (CBL), we report a novel coronary dedicated bifurcated balloon (DBB) catheter system. METHODS AND RESULTS: The device has been developed to follow the bifurcation geometry according to scaling laws of coronary anatomy. In an in vivo study, the DBB catheter was compared to the KBI technique in post-stent deployment of a bifurcation of a normal swine...
January 16, 2018: EuroIntervention
https://www.readbyqxmd.com/read/29333794/ablation-induced-change-in-the-course-of-fascicular-tachycardia
#11
Avishag Laish-Farkash, Avi Sabbag, Michael Glikson, Aharon Glick, Vladimir Khalameizer, Amos Katz, Yoav Michowitz
BACKGROUND: Multiform fascicular tachycardia (FT) was recently described as a ventricular tachycardia (VT) that has a reentrant mechanism using multiple fascicular branches and produces alternate fascicular VT forms. Ablating the respective fascicle may cause a change in the reentrant circuit resulting in a change in morphology. Ablation of the septal fascicle is crucial for successful treatment. OBJECTIVES: To describe four cases of FT in which ablation induced a change in QRS morphologies and aggravated clinical course...
January 2018: Israel Medical Association Journal: IMAJ
https://www.readbyqxmd.com/read/29333350/scale-up-of-a-luminescent-solar-concentrator-based-photomicroreactor-via-numbering-up
#12
Fang Zhao, Dario Cambié, Jeroen Janse, Eric W Wieland, Koen P L Kuijpers, Volker Hessel, Michael G Debije, Timothy Noël
The use of solar energy to power chemical reactions is a long-standing dream of the chemical community. Recently, visible-light-mediated photoredox catalysis has been recognized as the ideal catalytic transformation to convert solar energy into chemical bonds. However, scaling photochemical transformations has been extremely challenging due to Bouguer-Lambert-Beer law. Recently, we have pioneered the development of luminescent solar concentrator photomicroreactors (LSC-PMs), which display an excellent energy efficiency...
January 2, 2018: ACS Sustainable Chemistry & Engineering
https://www.readbyqxmd.com/read/29331437/influence-of-operator-experience-and-pci-volume-on-transfemoral-access-techniques-a-collaboration-of-international-cardiovascular-societies
#13
Daniel W Nelson, Abdulla A Damluji, Nish Patel, Marco Valgimigli, Stephan Windecker, Robert Byrne, James Nolan, Tejas Patel, Emmanouil Brilakis, Subhash Banerjee, Jorge Mayol, Warren J Cantor, Carlos E Alfonso, Sunil V Rao, Mauro Moscucci, Mauricio G Cohen
INTRODUCTION: Transfemoral access (TFA) is widely used for coronary angiography and percutaneous coronary intervention (PCI). The influence of operator age, gender, experience, and procedural volume on performance of femoral arterial access has not been studied. METHODS: A survey instrument was developed and distributed via e-mail from professional societies to interventional cardiologists worldwide from March to December 2016. RESULTS: A total of 988 physicians from 88 countries responded to the survey...
December 27, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/29330795/measurement-of-sensory-nerve-activity-from-the-carotid-body
#14
Ying-Jie Peng, Nanduri R Prabhakar
Carotid bodies are sensory organs for monitoring chemical composition of the arterial blood, especially the O2 levels. Carotid bodies are located bilaterally at the bifurcation of the common carotid artery. Hypoxia increases sensory nerve activity of the carotid body, which is transmitted to the brainstem neurons triggering reflex stimulation of breathing and blood pressure. Measurement of action potentials from the carotid sinus nerve is a widely used approach for understanding the mechanisms of hypoxic sensing by the carotid body...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29330074/a-nonlinear-continuous-time-model-for-a-semelparous-species
#15
A Veprauskas
Periodical semelparous insects such as cicadas and May beetles exhibit synchronization in age classes such that only one age class is present at any point of time. This leads to outbreaks of adults as they all reach maturity around the same time. Discrete-time models of semelparous species have shown that this type of synchronous cycling can occur as a result of greater between-class competition relative to within-class competition. However, relatively few studies have examined continuous-time models of semelparous species...
January 9, 2018: Mathematical Biosciences
https://www.readbyqxmd.com/read/29330055/tissue-geometry-may-govern-lung-branching-mode-selection
#16
Uduak Z George, Sharon R Lubkin
Lung branching morphogenesis proceeds in three stereotyped modes (domain, planar, and orthogonal branching). Much is known about the molecular players, including growth factors such as fibroblast growth factor 10 but it is unknown how these signals could actuate the different branching patterns. With the aim of identifying mechanisms that may determine the different branching modes, we developed a computational model of the epithelial lung bud and its surrounding mesenchyme. We studied transport of morphogens and localization of morphogen flux at lobe surfaces and lobe edges...
January 9, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29330054/deterministic-stability-regimes-and-noise-induced-quasistable-behavior-in-a-pair-of-reciprocally-inhibitory-neurons
#17
Mainak Patel, Badal Joshi
Reciprocal inhibition is a common motif exploited by neuronal networks; an intuitive and tractable way to examine the behaviors produced by reciprocal inhibition is to consider a pair of neurons that synaptically inhibit each other and receive constant or noisy excitatory driving currents. In this work, we examine reciprocal inhibition using two models (a voltage-based and a current-based integrate-and-fire model with instantaneous or temporally structured input), and we use analytic and computational tools to examine the bifurcations that occur and study the various possible monostable, bistable, and tristable regimes that can exist; we find that, depending on system parameters (and on choice of neuron model), there can exist up to 3 distinct monostable regimes (denoted M0, M1, M2), 3 distinct bistable regimes (denoted B, B1, B2), and a single tristable regime (denoted T)...
January 9, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29328847/an-anaesthesia-perspective-on-carotid-body-tumour-cbt-excision-a-twenty-year-case-series-at-the-singapore-general-hospital
#18
Deanna Wj Ng, Chris I Yam, Loong T Wong, Darren Lk Koh
Carotid body tumours (CBT) are extremely rare neoplasms that arise from chemoreceptor cells at the bifurcation of the carotid artery. This rarity poses a challenge for the anaesthetist when dealing with surgeries for the removal of CBT. Reports of associated perioperative morbidity range from twenty to forty percent. This paper reviews the perioperative anaesthetic management of CBT patients and challenges in our institution's 20 year experience on 13 surgical CBT resections.
October 2017: Journal of Perioperative Practice
https://www.readbyqxmd.com/read/29328734/connecting-the-kuramoto-model-and-the-chimera-state
#19
Tejas Kotwal, Xin Jiang, Daniel M Abrams
Since its discovery in 2002, the chimera state has frequently been described as a counterintuitive, puzzling phenomenon. The Kuramoto model, in contrast, has become a celebrated paradigm useful for understanding a range of phenomena related to phase transitions, synchronization, and network effects. Here we show that the chimera state can be understood as emerging naturally through a symmetry-breaking bifurcation from the Kuramoto model's partially synchronized state. Our analysis sheds light on recent observations of chimera states in laser arrays, chemical oscillators, and mechanical pendula...
December 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29328523/improved-portal-vein-venoplasty-with-autogenous-patch-in-pediatric-living-donor-liver-transplantation
#20
Mingxuan Feng, Ping Wan, Bijun Qiu, Tao Zhou, Yi Luo, Lihong Gu, Jiachang Chi, Chengpeng Zhong, Yefeng Lu, Jianjun Zhang, Qiang Xia
BACKGROUND: An atretic or hypoplastic portal vein (PV) represents a challenge for PV reconstruction in pediatric living donor liver transplantation (LDLT). Several PV venoplastic techniques have been developed. However, we still seek improved venoplastic techniques with better efficacy and compatibility. METHOD: From June 2016 to July 2017, 271 LDLT procedures were performed at the Department of Liver Surgery, Ren Ji Hospital. A total of 16 consecutive children with atretic and sclerotic PVs underwent a novel technique - the autogenous PV patch plastic technique...
January 12, 2018: Liver Transplantation
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