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Dynamics in the Parameter Space of a Neuron Model

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Chinese Physics Letters 2012年第6期29卷 64-67页

作者： Paulo C.rech Departamento de Fisica Universidade do Estado de Santa Catarina89219-710 JoinvilleBrazil

Some two-dimensional parameter-space diagrams are numerically obtained by considering the largest Lyapunov exponent for a four-dimensional thirteen-parameter Hindmarsh-Rose neuron *** different parameter planes are considered,and it is shown that depending on the combination of parameters,a typical scenario can be preserved:for some choice of two parameters,the parameter plane presents a comb-shaped chaotic region embedded in a large periodic *** is also shown that there exist regions close to these comb-shaped chaotic regions,separated by the comb teeth,organizing themselves in period-adding bifurcation cascades.

关键词： parameter chaotic shaped

The dynamics of a symmetric coupling of three modified quadratic maps

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Chinese Physics B 2013年第8期22卷 233-237页

作者： Paulo C. rech Departamento de Física Universidade do Estado de Santa Catarina89219-710 Joinville Brazil

We investigate the dynamical behavior of a symmetric linear coupling of three quadratic maps with exponential terms, and identify various interesting features as a function of two control parameters. In particular, we investigate the emergence of quasiperiodic states arising from Naimark-Sacker bifurcations of stable period-l, period-2, and period-3 orbits. We also investigate the multistability in the same coupling. Lyapunov exponents, parameter planes, phase space portraits, and bifurcation diagrams are used to investigate transitions from periodic to quasiperiodic states, from quasiperiodic to mode-locked states and to chaotic states, and from chaotic to hyperchaotic states.

关键词： Naimark-Sacker bifurcation quasiperiodicity chaos hyperchaos

Changes in the Dynamics of a Rössler Oscillator by an External Forcing

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Chinese Physics Letters 2013年第3期30卷 22-25页

作者： Amanda C.Mathias Paulo C.rech Departamento de Física Universidade do Estado de Santa Catarina89219-710 JoinvilleBrazil

We report some results indicating changes in the observed dynamics of the Rössler model under the influence of external sinusoidal *** varying the control parameters of the external sinusoidal forcing,namely the amplitude and the angular frequency,we show,through numerical simulations which include parameter planes and Lyapunov exponents,that the external forcing can produce both chaos-order and order-chaos *** also show that the sinusoidal forcing may generate hyperchaos.

关键词： chaos sinusoidal transitions

Chaos Suppression in a Sine Square Map through Nonlinear Coupling

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Chinese Physics Letters 2011年第11期28卷 45-48页

作者： Eduardo L.Brugnago Paulo C.rech Departamento de Física Universidade do Estado de Santa Catarina89223-100 JoinvilleBrazil

We study a pair of nonlinearly coupled identical chaotic sine square *** specifically,we investigate the chaos suppression associated with the variation of two ***-dimensional parameter-space regions where the chaotic dynamics of the individual chaotic sine square map is driven towards regular dynamics are ***,the dynamics of the coupled system is numerically characterized as the parameters are changed.

关键词： chaotic dynamics Chaos

A Parameter-Space Analysis of the Rikitake System

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Chinese Physics Letters 2013年第12期30卷 13-16页

作者： Rodrigo A.da Silva Paulo C.rech Departamento de Física Universidade do Estado de Santa Catarina89219-710 JoinvilleBrazil

We investigate analytically and numerically the dynamics of the Rikitake *** Routh–Hurwitz criterion is used to study the stability of the equilibrium points of the differential equation system model,as functions of two *** dynamics of the model are numerically studied using diagrams that associate colors to the largest Lyapunov exponent value,in two-dimensional parameter ***,phase-space plots and bifurcation diagrams are used to distinguish periodic and chaotic attractors.

关键词： bifurcation exponent chaotic

The impact of fluorination on both donor polymer and non-fullerene acceptor:The more fluorine,the merrier

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Nano Research 2019年第9期12卷 2400-2405页

作者： Nicole Bauer Qianqian Zhang Jeromy James rech Shuixing Dai Zhengxing Peng Harald Ade Jiayu Wang Xiaowei Zhan Wei You Department of Chemistry University of North Carolina at Chapel HillNorth Carolina 27599USA Department of Materials Science and Engineering College of EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry EducationPeking UniversityBeijing 100871China Department of Physics and ORaCEL North Carolina State UniversityRaleighNorth Carolina 27695USA

Fluorination of the donor polymer or non-fullerene acceptor (NFA) in an organic photovoltaic device is an effective method to improve device *** there have been many studies on donor polymer fluorination,blends containing both a fluorinated donor and fluorinated NFA have rarely been *** this study,we use two donor polymers (4'-FT-HTAZ and 4'-FT-FTAZ) and two NFAs (ITIC-Th and ITIC-Th1) with different amounts of fluorine (from 2F to 6F) to investigate how the degree of fluorination in a blend impacts device *** find that fluorinating the NFA leads to a higher short-circuit current density (Jsc) and fill factor (FF),however,the open-circuit voltage (Voc) is decreased due to a depressed lowest unoccupied molecular orbital (LUMO) *** additional fluorine to the donor polymer does not have a large effect on the Jsc or FF,but it does lead to an improved *** fluorinating the NFA and having more fluorine on the donor polymer,we obtain both a high Jsc and Voc simultaneously,leading to a power conversion efficiency over 10% in the case of 4'-FT-FTAZ:ITIC-Th1,which has the most amount of fluorine (6F).

关键词： organic solar cells non-fullerene acceptors fluorination bulk heterojunction

Numerical Study of a Three-Dimensional H6non Map

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Chinese Physics Letters 2011年第1期28卷 8-11页

作者： Gabriela A. Casas Paulo C. rech Departamento de Ffsica Universidade do Estado de Santa Catarina 89223-100 Joinville Brazil

We consider a three-dimensional generalization of the two-dimensional Henon map. We first investigate the emergence of quasiperiodic states, as a result of Naimark-Sacker bifurcations of period-1 and period-2 orbits. Secondly we investigate the disappearance of the resonance torus in the transition from quasiperiodieity to chaos.

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Metastatic gastric cancer from breast carcinoma presenting with paraneoplastic rheumatic syndrome:A case report

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World Journal of Clinical Cases 2023年第14期11卷 3282-3287页

作者： Marília Bortoluz rech Eduarda Renz da-Cruz Karina Salgado Raul Angelo Balbinot Silvana Sartori Balbinot Jonathan Soldera School of Medicine Universidade de Caxias do SulCaxias do Sul 95070-560Rio Grande do SulBrazil Department of Pathology ICAP PathologyCaxias do Sul 95020-002Rio Grande do SulBrazil Department of Clinical Gastroenterology Universidade de Caxias do SulCaxias do Sul 95070-560Rio Grande do SulBrazil

BACKGROUND Breast cancer is the most frequently diagnosed cancer *** is the leading cause of death by malignant disease in *** SUMMARY A female patient,73 years of age,sought care due to weakness,mild abdominal pain,arthralgia,and weight *** was taking anastrazole as maintenance therapy for localized breast cancer and had moderate anemia and elevated acutephase *** digestive endoscopy showed isolated erosion in the gastric *** lesion was compatible with signet-ring cell adenocarcinoma in anatomopathological study and was confirmed as metastasis of a breast carcinoma in immunohistochemistry,which was positive for estrogen *** imaging studies determined numerous proximal bone *** patient was treated with prednisone for paraneoplastic syndrome,which improved the anemia and rheumatic disease,and with chemotherapy,which greatly improved the *** has been followed-up for 6 mo,and her anemia,arthralgias,and acute phase markers have *** Systemic treatment strategies seem to be the best choice for gastric metastasis from breast cancer,resulting in disease control and relapse-free *** studies with longer follow-up are needed to better understand the biological,pathological,and clinicopathological characteristics and outcomes of the endoscopic features associated with metastatic gastric cancer from breast carcinoma.

关键词： Breast cancer Gastric metastasis Anemia Paraneoplastic syndrome Case report

肌肉骨骼系统肿瘤：流行病学、临床表现和诊断

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放射学实践 1996年第1期11卷 33-38页

作者： rech.,H 董卫国同济医科大学附属同济医院

肌肉骨骼系统肿瘤：流行病学、临床表现和诊断ＭｕｓｋｕｌｏｓｋｅｌｅｔｔａｌｅＴｕｍｏｒｅｎ：Ｅｐｉｄｅｍｉｏｌｏｇｉｅ，ＫｌｉｎｉｋｕｎｄＡｎｆｏｒｄｅｒｕｎｇａｎｄｉｅＤｉａｇｎｏｓｔｉｋ￥Ｈ．Ｒｅｃｈｌ；Ｗ．Ｐｌ... 详细信息

肌肉骨骼系统肿瘤：流行病学、临床表现和诊断ＭｕｓｋｕｌｏｓｋｅｌｅｔｔａｌｅＴｕｍｏｒｅｎ：Ｅｐｉｄｅｍｉｏｌｏｇｉｅ，ＫｌｉｎｉｋｕｎｄＡｎｆｏｒｄｅｒｕｎｇａｎｄｉｅＤｉａｇｎｏｓｔｉｋ￥Ｈ．Ｒｅｃｈｌ；Ｗ．Ｐｌｏｔｚ；Ｒ．Ｂｕｒｇｋａｒｔ；Ｒ．...

关键词：肿瘤肌肉骨骼系统流行病学临床表现诊断