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夫性与妻性的缺如:传统家庭体制的一种社会分析 被引量:4
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作者 施津菊 《青海社会科学》 2002年第5期69-73,共5页
关键词 夫性 传统家庭体制 社会分析
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论岭南高僧成鹫以禅喻诗及“诗本夫性”说
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作者 王富鹏 《佛山科学技术学院学报(社会科学版)》 2022年第3期5-10,共6页
以禅喻诗自宋代严羽之后即成为中国诗学传统中的一个重要话题。清初诗僧成鹫不但以禅喻诗、以禅史喻诗史,还以宗风比诗风,以禅品喻诗品。他的论述进一步丰富和发展了严羽以禅喻诗的诗学思想。他认为“诗本夫性”,相对于“诗缘情”“诗... 以禅喻诗自宋代严羽之后即成为中国诗学传统中的一个重要话题。清初诗僧成鹫不但以禅喻诗、以禅史喻诗史,还以宗风比诗风,以禅品喻诗品。他的论述进一步丰富和发展了严羽以禅喻诗的诗学思想。他认为“诗本夫性”,相对于“诗缘情”“诗本性情”来说,其“诗本夫性”说,更深入一层,是对中国传统的“诗缘情”“诗本性情”等诗学理论的发展和深化。在他看来诗与禅,皆以性情、性命、性为根本。这一思想不但贯通了诗与禅,而且也指出了以禅喻诗的深层依据。 展开更多
关键词 以禅喻诗 诗本 诗缘情 诗本夫性
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Investigation on nonlinear rolling dynamics of amphibious vehicle under wind and wave load
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作者 马新谋 常列珍 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2015年第3期275-281,共7页
Nonlinear amphibious vehicle rolling under regular waves and wind load is analyzed by a single degree of freedom system.Considering nonlinear damping and restoring moments,a nonlinear rolling dynamical equation of amp... Nonlinear amphibious vehicle rolling under regular waves and wind load is analyzed by a single degree of freedom system.Considering nonlinear damping and restoring moments,a nonlinear rolling dynamical equation of amphibious vehicle is established.The Hamiltonian function of the nonlinear rolling dynamical equation of amphibious vehicle indicate when subjected to joint action of periodic wave excitation and crosswind,the nonlinear rolling system degenerates into being asymmetric.The threshold value of excited moment of wave and wind is analyzed by the Melnikov method.Finally,the nonlinear rolling motion response and phase portrait were simulated by four order Runge-Kutta method at different excited moment parameters. 展开更多
关键词 amphibious vehicle nonlinear rolling motion Melnikov method nonlinear dynamics crosswind load
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LOCAL CHAOS CHARACTERISTICS IN A SELF ASPIRATED REVERSED FLOW JET LOOP REACTOR
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作者 刘明言 闻建平 +1 位作者 秦秀云 胡宗定 《Transactions of Tianjin University》 EI CAS 1998年第1期58-61,共4页
The local chaos characteristics of the time series pressure fluctuations of gas liquid two phase flow in a self aspirated reversed flow jet loop reactor are studied by the deterministic chaos analysis technique. It... The local chaos characteristics of the time series pressure fluctuations of gas liquid two phase flow in a self aspirated reversed flow jet loop reactor are studied by the deterministic chaos analysis technique. It is found that the estimated local largest Lyapunov exponent is positive in all cases and the profile is similar to that of the local fractal dimension in this reactor. The positive largest Lyapunov exponent shows that the reactor is a nonlinear chaotic system. The obvious distribution indicates that the local nonlinear characteristic parameters such as the Lyapunov exponent and the fractal dimension could be applied to further study the flow characteristics such as the flow regine transitions and flow structures of the multi phase reactors. 展开更多
关键词 self aspirated reversed flow jet loop reactor the largest Lyapunov exponent chaos characteristic
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Residual life estimation based on bivariate Wiener degradation process with measurement errors 被引量:12
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作者 王小林 郭波 +1 位作者 程志君 蒋平 《Journal of Central South University》 SCIE EI CAS 2013年第7期1844-1851,共8页
An adaptive method of residual life estimation for deteriorated products with two performance characteristics (PCs) was proposed, which was sharply different from existing work that only utilized one-dimensional degra... An adaptive method of residual life estimation for deteriorated products with two performance characteristics (PCs) was proposed, which was sharply different from existing work that only utilized one-dimensional degradation data. Once new degradation information was available, the residual life of the product being monitored could be estimated in an adaptive manner. Here, it was assumed that the degradation of each PC over time was governed by a Wiener degradation process and the dependency between them was characterized by the Frank copula function. A bivariate Wiener process model with measurement errors was used to model the degradation measurements. A two-stage method and the Markov chain Monte Carlo (MCMC) method were combined to estimate the unknown parameters in sequence. Results from a numerical example about fatigue cracks show that the proposed method is valid as the relative error is small. 展开更多
关键词 residual life performance characteristics bivariate Wiener process Frank copula MCMC method
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Chaotic Roll Motions of Ships in Regular Longitudinal Waves 被引量:4
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作者 胡开业 丁勇 王宏伟 《Journal of Marine Science and Application》 2010年第2期208-212,共5页
Parametric resonance can lead to dangerously large rolling motions, endangering the ship, cargo and crew. The QR-faetorization method for calculating (LCEs) Lyapunov Characteristic Exponents was introduced; parametr... Parametric resonance can lead to dangerously large rolling motions, endangering the ship, cargo and crew. The QR-faetorization method for calculating (LCEs) Lyapunov Characteristic Exponents was introduced; parametric resonance stability of ships in longitudinal waves was then analyzed using LCEs. Then the safe and unsafe regions of target ships were then identified. The results showed that this method can be used to analyze ship stability and to accurately identify safe and unsafe operating conditions for a ship in longitudinal waves. 展开更多
关键词 parametric resonance Lyapunov characteristic exponents longitudinal waves.
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Effect of lamivudinein in BeAg-positive chronic hepatitis B: Discordant effect on HBeAg and HBV DNA according to pretreatment ALT level 被引量:5
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作者 Tomoko Kurihara Fumio Imazeki +4 位作者 Osamu Yokosuka Kenichi Fukai Tatsuo Kanda Shigenobu Kawai Hiromitsu Saisho 《World Journal of Gastroenterology》 SCIE CAS CSCD 2005年第22期3346-3350,共5页
AM: To clarify differences in antiviral effect of the drug in patients with different ALT levels, we examined the changes in HBV markers in patients with high or low ALT levels with or without lamivudine treatment. ME... AM: To clarify differences in antiviral effect of the drug in patients with different ALT levels, we examined the changes in HBV markers in patients with high or low ALT levels with or without lamivudine treatment. METHODS: Thirty-seven HBeAg-positive patients were studied. Ten patients with ALT levels higher than 200 IU/L (group 1) and 8 patients with ALT below 200 IU/L (group 2) were treated orally with 100 mg/d of lamivudine. As untreated control, 9 patients with ALT above 200 IU/L (group 3) and 10 patients with ALT below 200 IU/L (group 4) were examined. ALT level, HBeAg/HBeAb status, and HBV DNA level were examined monthly for 11.9±0.4 mo. RESULTS: The ALT level normalized in all 10 patients of group 1, 7/8 of group 2, 4/9 of group 3, and 1/10 of group 4 within 6 mo (groups 1 vs2, P= NS; groups 1 vs 3, P= 0.002; groups 1 vs4, P<0.0001). HBV DNA fell below the detection limit in all 10 patients of group 1, 7/8 of group 2, 0/9 of group 3, and 0/10 of group 4 within 6 mo (groups 1 vs 2, P - NS). HBeAg became seronegative in 7/10 patients of group 1, 1/8 of group 2, 3/9 of group 3, and 0/10 of group 4 within 12 mo (groups 1 vs2, P= 0.02; groups 1 vs 3, P= NS). CONCLUSION: Our data suggest that HBeAg-positive patients with higher ALT levels can be considered good candidates for lamivudine therapy, probably because lamivudine accelerates the natural seroconversion of HBeAg, accompanied by HBV DNA loss, in these patients. 展开更多
关键词 LAMIVUDINE Chronic hepatitis B HBEAG HBV DNA ALT
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In vitro degradation resistance of glucose and L-cysteine-bioinspired Schiff-base anodic Ca−P coating on AZ31 magnesium alloy 被引量:1
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作者 Xue-mei WANG Xiao-li FAN +6 位作者 Mei-qi ZENG Chang-yang LI Lan-yue CUI Xiao-bo CHEN Yu-hong ZOU Zhen-lin WANG Rong-chang ZENG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第5期1485-1500,共16页
A Schiff base(a compound containing a C=N bond)induced anodic Ca−P coating was prepared on AZ31 Mg alloy in a mixed solution of CaCl_(2) and KH_(2)PO_(4) at 60℃ in the presence of glucose and L-cysteine.The microstru... A Schiff base(a compound containing a C=N bond)induced anodic Ca−P coating was prepared on AZ31 Mg alloy in a mixed solution of CaCl_(2) and KH_(2)PO_(4) at 60℃ in the presence of glucose and L-cysteine.The microstructure and chemical composition of the coatings were characterized using FE-SEM,FT-IR,XRD,and XPS.The in vitro degradation resistance of the coated samples was evaluated via potentiodynamic polarization(PDP),electrochemical impedance spectroscopy(EIS),and hydrogen evolution test.The experimental results show that the Ca−PSchiff base coating is composed of CaHPO_(4)(DCPA)and hydroxyapatite(HA),whereas HA is not present in the Ca−P coating.The Ca−P_(Schiff base) coating thickness is about 2 times that of Ca−P coating(Ca−P coating:(9.13±4.20)μm and Ca−P_(Schiff base):(18.13±5.78)μm).The corrosion current density of the Ca−P_(Schiff base) coating is two orders of magnitude lower than that of the Ca−P coating.The formation mechanism of the Ca−P_(Schiff base) is proposed. 展开更多
关键词 magnesium alloy anodic coating corrosion resistance Schiff base biomaterial
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Long-term alpha interferon and lamivudine combination therapy in non-responder patients with anti-HBe-positive chronic hepatitis B:Results of an open,controlled trial 被引量:10
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作者 M. Francesca Jaboli Carlo Fabbri +12 位作者 Stefania Liva Francesco Azzaroli Giovanni Nigro Silvia Giovanelli Francesco Ferrara Anna Miracolo Sabrina Marchetto Marco Montagnani Antonio Colecchia Davide Festi Letizia Bacchi Reggiani Enrico Roda Giuseppe Mazzella 《World Journal of Gastroenterology》 SCIE CAS CSCD 2003年第7期1491-1495,共5页
AIM: To investigate the safety and efficacy of long-term combination therapy with alpha interferon and lamivudine in non-responsive patients with anti-HBe-positive chronic hepatitis B.METHODS: 34 patients received com... AIM: To investigate the safety and efficacy of long-term combination therapy with alpha interferon and lamivudine in non-responsive patients with anti-HBe-positive chronic hepatitis B.METHODS: 34 patients received combination treatment (1 month lamivudine, 12 month lamivudine+interferon, 6month lamivudine), 24 received lamivudine (12 months),24 received interferon (12 months). Interferon was administered at 6 MU tiw and lamivudine at 100 mg orally once daily. Patients were followed up for 6 months after treatment.RESULTS: At the end of treatment, HBV DNA negativity rates were 88 % with lamivudine+interferon, 99 % with lamivudine and 55 % with interferon, (P=0.004, combination therapy vs. interferon, and P=0.001 lamivudine vs.interferon), and serum transaminase normalization rates were 84 %, 91% and 53 % (P=0.01 combination therapy vs. interferon, and P=0.012 lamivudine vs. interferon). Six months later, HBV DNA negativity rates were 44 % with lamivudine+interferon, 33 % with lamivudine and 25 % with interferon, and serum transaminase normalization rates were 61%, 42 % and 45 %, respectively, without statistical significance. No YMDD variants were observed with lamivudine+interferon (vs. 12 % with lamivudine). The combination therapy appeared to be safe. CONCLUSION: Although viral clearance and transaminase normalization are slower with long-term lamivudine+interferon than that with lamivudine alone, the combination regimen seems to provide more lasting benefits and to protect against the appearance of YMDD variants. Studies with other regimens regarding sequence and duration are needed. 展开更多
关键词 ADULT Antiviral Agents DOSAGE Drug Therapy Combination FEMALE Hepatitis B Chronic Humans INTERFERON-ALPHA LAMIVUDINE Male Middle Aged Reverse Transcriptase Inhibitors Treatment Outcome
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Exponential stabilization of distributed parameter switched systems under dwell time constraints
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作者 鲍乐平 费树岷 翟军勇 《Journal of Southeast University(English Edition)》 EI CAS 2013年第4期389-394,共6页
The exponential stabilization problem for finite dimensional switched systems is extended to the infinite dimensional distributed parameter systems in the Hilbert space. Based on the semigroup theory, by applying the ... The exponential stabilization problem for finite dimensional switched systems is extended to the infinite dimensional distributed parameter systems in the Hilbert space. Based on the semigroup theory, by applying the multiple Lyapunov function method, the exponential stabilization conditions are derived. These conditions are given in the form of linear operator inequalities where the decision variables are operators in the Hilbert space; while the stabilization properties depend on the switching rule. Being applied to the two-dimensional heat switched propagation equations with the Dirichlet boundary conditions, these linear operator inequalities are transformed into standard linear matrix inequalities. Finally, two examples are given to illustrate the effectiveness of the proposed results. 展开更多
关键词 distributed parameter switched systems exponential stabilization multiple Lyapunov function linear operator inequalities dwell time
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Traffic Characteristics Based Dynamic Radio Resource Management in Heterogeneous Wireless Networks 被引量:4
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作者 WEN Juan SHENG Min ZHANG Yan WANG Xijun LI Yuzhou 《China Communications》 SCIE CSCD 2014年第1期1-11,共11页
The traffic with tidal phenomenon in Heterogeneous Wireless Networks(HWNs)has radically increased the complexity of radio resource management and its performance analysis.In this paper,a Simplified Dynamic Hierarchy R... The traffic with tidal phenomenon in Heterogeneous Wireless Networks(HWNs)has radically increased the complexity of radio resource management and its performance analysis.In this paper,a Simplified Dynamic Hierarchy Resource Management(SDHRM)algorithm exploiting the resources dynamically and intelligently is proposed with the consideration of tidal traffic.In network-level resource allocation,the proposed algorithm first adopts wavelet neural network to forecast the traffic of each sub-area and then allocates the resources to those sub-areas to maximise the network utility.In connection-level network selection,based on the above resource allocation and the pre-defined QoS requirement,three typical network selection policies are provided to assign traffic flow to the most appropriate network.Furthermore,based on multidimensional Markov model,we analyse the performance of SDHRM in HWNs with heavy tailed traffic.Numerical results show that our theoretical values coincide with the simulation results and the SDHRM can improve the resource utilization. 展开更多
关键词 heterogeneous wireless networks radio resource management multidimensional Markov analysis tidal traffic performance analysis
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Reservoir lithology stochastic simulation based on Markov random fields 被引量:2
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作者 梁玉汝 王志忠 郭建华 《Journal of Central South University》 SCIE EI CAS 2014年第9期3610-3616,共7页
Markov random fields(MRF) have potential for predicting and simulating petroleum reservoir facies more accurately from sample data such as logging, core data and seismic data because they can incorporate interclass re... Markov random fields(MRF) have potential for predicting and simulating petroleum reservoir facies more accurately from sample data such as logging, core data and seismic data because they can incorporate interclass relationships. While, many relative studies were based on Markov chain, not MRF, and using Markov chain model for 3D reservoir stochastic simulation has always been the difficulty in reservoir stochastic simulation. MRF was proposed to simulate type variables(for example lithofacies) in this work. Firstly, a Gibbs distribution was proposed to characterize reservoir heterogeneity for building 3-D(three-dimensional) MRF. Secondly, maximum likelihood approaches of model parameters on well data and training image were considered. Compared with the simulation results of MC(Markov chain), the MRF can better reflect the spatial distribution characteristics of sand body. 展开更多
关键词 stochastic modeling Markov random fields training image Monte Carlo simulation
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A Brief Analysis on Women in Victorian Age --Based on Mrs. Warren' s Profession
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作者 李雪 《International English Education Research》 2016年第2期70-72,共3页
George Bernard Shaw is one of the prominent playwrights in the world. His masterpiece Mrs. Warren' s Profession has an important effect on the world. This play is so influential that it injects a new thing into the b... George Bernard Shaw is one of the prominent playwrights in the world. His masterpiece Mrs. Warren' s Profession has an important effect on the world. This play is so influential that it injects a new thing into the black society. This play also inspires women to stand up to fight against the old power. Only by describing the suffering of Warren and Vivie can the writer expose the social root forming the brothel in the capital society. It also shows Shaw is critical and sympathetic towards women in the society. This work has been studied in different aspects by scholars. Based on women in Victorian Society, this paper mainly discusses the main characters Warren and Vivie Warren to form a distinctive contrast between submissive woman and new woman. Warren and Vivie serve an example to illustrate the features of Victorian women. War Warren, a symbol of the submissive woman who runs brothel, submits to the reality and makes a living by doing exploiting, while as a new woman and a positive figure, Vivie is brave enough to break away from all the traditional bondage and pursues a new life after knowing that her mother has been doing this kind of work. All the differences in the character lead to the break-up between the two. 展开更多
关键词 Victorian Age women Mrs Warren Vivie
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Delay-Dependent Exponential Stability of Stochastic Delayed Recurrent Neural Networks with Markovian Switching
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作者 刘海峰 王春华 魏国亮 《Journal of Donghua University(English Edition)》 EI CAS 2008年第2期195-199,共5页
The exponential stability problem is investigated for a class of stochastic recurrent neural networks with time delay and Markovian switching. By using Ito's differential formula and the Lyapunov stability theory, su... The exponential stability problem is investigated for a class of stochastic recurrent neural networks with time delay and Markovian switching. By using Ito's differential formula and the Lyapunov stability theory, sufficient condition for the solvability of this problem is derived in term of linear matrix inequalities, which can be easily checked by resorting to available software packages. A numerical example and the simulation are exploited to demonstrate the effectiveness of the proposed results. 展开更多
关键词 exponential stability stochastic recurrent neural network linear matrix inequality time delay Markovian switching
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Synthesis, Crystal Structure and Nonlinear Optical Properties of Nickel(Ⅱ) Complex with Schiff-base Ligand 被引量:1
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作者 薛照明 张宣军 +3 位作者 田玉鹏 吴杰颖 蒋民华 Fun Hoong Kun 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2003年第3期265-269,共5页
The nickel(Ⅱ) complex with the new ligand of S-benzyl-b-N-[10-ethyl- phenothiazine-3-methylene]dithiocarbazate(HL) crystallizes in the triclinic system, space group P?with a = 7.516(1), b = 11.322(1), c = 13.366(1) ,... The nickel(Ⅱ) complex with the new ligand of S-benzyl-b-N-[10-ethyl- phenothiazine-3-methylene]dithiocarbazate(HL) crystallizes in the triclinic system, space group P?with a = 7.516(1), b = 11.322(1), c = 13.366(1) , a = 84.818(1), b = 81.688(1), g = 76.037(1), V = 1090.26(3) 3, Z = 1, Dc = 1.413 g/cm3, F(000) = 482, m(MoKa) = 0.774 mm-1 (l = 0.7103 ?, R = 0.0573 and wR = 0.1375 for 3357 observed reflections with I ≥ 2s(I). The HL has lost a proton from its tautomeric thiol form and acts as a single negatively charged bidentate ligand coordinating to the nickel ion via the mercapto sulfur and b-nitrogen atoms. The geometry around Ni(Ⅱ) is almost square-planar with two equivalent NiN and NiS bonds. The nonlinear absorption of HL and NiL2 solutions (in DMF) was measured by open-aperture Z-scan technique at the wavelength of 532 nm. 展开更多
关键词 crystal structure nickel complex NLO
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Stabilization of nonlinear systems based on robust control Lyapunov function
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作者 蔡秀珊 韩正之 吕干云 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2007年第1期130-133,共4页
This paper deals with the robust stabilization problem for a class of nonlinear systems with structural uncertainty. Based on robust control Lyapunov function, a sufficient and necessary condition for a function to be... This paper deals with the robust stabilization problem for a class of nonlinear systems with structural uncertainty. Based on robust control Lyapunov function, a sufficient and necessary condition for a function to be a robust control Lyapunov function is given. From this condition, simply sufficient condition for the robust stabilization (robust practical stabilization) is deduced. Moreover, if the equilibrium of the closed-loop system is unique, the existence of such a robust control Lyapunnv function will also imply robustly globally asymptotical stabilization. Then a continuous state feedback law can be constructed explicitly. The simulation shows the effectiveness of the method. 展开更多
关键词 structural uncertainty nonlinear systems robust control Lyapunov function robustly asymptotical stabilizatio
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Update on autoimmune hepatitis 被引量:17
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作者 Andreas Teufel Peter R Galle Stephan Kanzler 《World Journal of Gastroenterology》 SCIE CAS CSCD 2009年第9期1035-1041,共7页
Autoimmune hepatitis (AIH) is a necroinflammatory liver disease of unknown etiology that occurs in children and adults of all ages. Characteristics are its autoimmune features,hyperglobulinemia (IgG),and the presence ... Autoimmune hepatitis (AIH) is a necroinflammatory liver disease of unknown etiology that occurs in children and adults of all ages. Characteristics are its autoimmune features,hyperglobulinemia (IgG),and the presence of circulating autoantibodies,as well as a response to immunosuppressant drugs. Current treatment consists of prednisone and azathioprine and in most patients this disease has become very treatable. Over the past 2 years,a couple of new insights into the genetic aspects,clinical course and treatment of AIH have been reported,which will be the focus of this review. In particular,we concentrate on genome-wide microsatellite analysis,a novel mouse model of AIH,the evaluation of a large AIH cohort for overlap syndromes,suggested novel criteria for the diagnosis of AIH,and the latest studies on treatment of AIH with budenoside and mycophenolate mofetil. 展开更多
关键词 Autoimmune hepatitis Autoimmune liver disease BUDESONIDE GENETICS Mycophenolate mofetil Overlap syndromes
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Adalimumab induction therapy for ulcerative colitis with intolerance or lost response to infliximab: An open-label study 被引量:2
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作者 Laurent Peyrin-Biroulet Cécile Laclotte +1 位作者 Xavier Roblin Marc-André Bigard 《World Journal of Gastroenterology》 SCIE CAS CSCD 2007年第16期2328-2332,共5页
AIM: To evaluate the efficacy of adalimumab induction therapy in patients with ulcerative colitis who previously responded to infliximab and then lost response or became intolerant. METHODS: Ten patients with ulcerati... AIM: To evaluate the efficacy of adalimumab induction therapy in patients with ulcerative colitis who previously responded to infliximab and then lost response or became intolerant. METHODS: Ten patients with ulcerative colitis were enrolled in a 4-wk open-label trial. The patients received a loading dose of 160 mg adalimumab at wk 0 followed by 80 mg at wk 2. The primary efficacy measure was clinical improvement at wk 4, as defined by a decrease in clinical activity index (CAI) of more than 4. RESULTS: Four of 10 patients (40%) benefited from subsequent adalimumab therapy; one patient achieved remission (CAI < 4) and 3 had clinical improvement at wk 4. 6 patients had no response (60%); 2 of 6 (33.3%) subsequently underwent colectomy. This was accompanied by a decrease in median CRP concentration from 16.8 mg/mL at baseline to 3.85 mg/mL at wk 4, excluding two patients who underwent colectomy after two infusions of adalimumab. Among the 6 patients with severe colitis (CAI > 12) at baseline, none achieved remission and only one patient had clinical improvement at wk 4. CONCLUSION: The small advantage of adalimumab in patients with mild to moderate ulcerative colitis and lost response or intolerance to infliximab needs to be confirmed in randomised, double-blind, placebo- controlled trials. 展开更多
关键词 ANTI-TNF INTOLERANCE Loss of response ADALIMUMAB Ulcerative colitis
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Calculation of Coefficients of Simplest Normal Forms of Hopf and Generalized Hopf Bifurcations 被引量:3
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作者 田瑞兰 张琪昌 何学军 《Transactions of Tianjin University》 EI CAS 2007年第1期18-22,共5页
The coefficients of the simplest normal forms of both high-dimensional generalized Hopf and high-dimensional Hopf bifurcation systems were discussed using the adjoint operator method. A particular nonlinear scaling an... The coefficients of the simplest normal forms of both high-dimensional generalized Hopf and high-dimensional Hopf bifurcation systems were discussed using the adjoint operator method. A particular nonlinear scaling and an inner product were introduced in the space of homogeneous polynomials. Theorems were established for the explicit expression of the simplest normal forms in terms of the coefficients of both the conventional normal forms of Hopf and generalized Hopf bifurcation systems. A symbolic manipulation was designed to perform the calculation of the coefficients of the simplest normal forms using Mathematica. The original ordinary differential equation was required in the input and the simplest normal form could be obtained as the output. Finally, the simplest normal forms of 6-dimensional generalized Hopf singularity of type 2 and 5-dimensional Hopf bifurcation system were discussed by executing the program. The output showed that the 5th- and 9th-order terms remained in 6-dimensional generalized Hopf singularity of type 2 and the 3rd- and 5th-order terms remained in 5-dimensional Hopf bifurcation system. 展开更多
关键词 nonlinear systems Hopf bifurcations simplest normal form COEFFICIENT symbolic manipulation
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Bistability in Coupled Oscillators Exhibiting Synchronized Dynamics
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作者 O.I.Olusola U.E.Vincent +1 位作者 A.N.Njah J.A.Olowofela 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第5期815-824,共10页
We report some new results associated with the synchronization behavior of two coupled double-well Duffing oscillators (DDOs). Some sufficient algebraic criteria for global chaos synchronization of the drive and res... We report some new results associated with the synchronization behavior of two coupled double-well Duffing oscillators (DDOs). Some sufficient algebraic criteria for global chaos synchronization of the drive and response DDOs via linear state error feedback control are obtained by means of Lyapunov stability theory. The synchronization is achieved through a bistable state in which a periodic attractor co-exists with a chaotic attractor. Using the linear perturbation analysis, the prevalence of attractors in parameter space and the associated bifurcations are examined. Subcritical and supercritical Hopf bifurcations and abundance of Arnold tongues -- a signature of mode locking phenomenon are found. 展开更多
关键词 CHAOS SYNCHRONIZATION Duffing oscillator BISTABILITY Lyapunov stability theory
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