The analysis of structure and dynamics in chaotic systems has long been a significant research direction in nonlinear science.Constructing a reliable chaotic system with rich dynamical characteristics is essential for...The analysis of structure and dynamics in chaotic systems has long been a significant research direction in nonlinear science.Constructing a reliable chaotic system with rich dynamical characteristics is essential for secure communication applications.Existing memristor-based chaotic maps are typically obtained by incorporating discrete mathematical models of memristors into basic chaotic maps.In this study,a simple memristive nonlinear circuit is first designed,from which a memristive oscillator is derived.Subsequently,a memristive map is developed from this oscillator through a linear transformation of the variables.The reliability of the new map is validated through nonlinear dynamic analysis.The results demonstrate that the map exhibits complex nonlinear dynamics under different parameter settings.This finding is beneficial for the construction of memristor maps and the development of image encryption algorithms.展开更多
The nonlinear memory characteristics of memristors resemble those of biological synapses and ion channels.Therefore,memristors serve as ideal components for constructing artificial neurons.This paper presents a sound-...The nonlinear memory characteristics of memristors resemble those of biological synapses and ion channels.Therefore,memristors serve as ideal components for constructing artificial neurons.This paper presents a sound-sensitive neuron circuit featuring a memristor-based hybrid ion channel,designed to simulate the dynamic response mechanisms of biological auditory neurons to acoustic signals.In this neural circuit,a piezoelectric ceramic element captures external sound signals,while the hybrid ion channel is formed by connecting a charge-controlled memristor in series with an inductor.The circuit realizes selective encoding of sound frequency and amplitude and investigates the influence of external electric fields on neuronal ion-channel dynamics.In the dynamic analysis,bifurcation diagrams and Lyapunov exponents are employed to reveal the rich nonlinear behaviors,such as chaotic oscillations and periodic oscillations,exhibited by the circuit during the acoustic–electric conversion process,and the validity of the circuit model is experimentally verified.Simulation results show that by adjusting the threshold of the ratio between electric-field energy and magnetic-field energy,the firing modes and parameters of neurons can be adaptively regulated.Moreover,the model exhibits stochastic resonance in noisy environments.This research provides a theoretical foundation for the development of new bionic auditory sensing hardware and opens a new path for the bio-inspired design of memristor–ion-channel hybrid systems.展开更多
Biological neurons exhibit a double-membrane structure and perform specialized functions.Replicating the doublemembrane architecture in artificial neurons to mimic biological neuronal functions is a compelling researc...Biological neurons exhibit a double-membrane structure and perform specialized functions.Replicating the doublemembrane architecture in artificial neurons to mimic biological neuronal functions is a compelling research challenge.In this study,we propose a multifunctional neural circuit composed of two capacitors,two linear resistors,a phototube cell,a nonlinear resistor,and a memristor.The phototube and charge-controlled memristor serve as sensors for external light and electric field signals,respectively.By applying Kirchhoff's and Helmholtz's laws,we derive the system's nonlinear dynamical equations and energy function.We further investigate the circuit's dynamics using methods from nonlinear dynamics.Our results show that the circuit can exhibit both periodic and chaotic patterns under stimulation by external light and electric fields.展开更多
Background:Primary pulmonary amoeba is very rare and here we report a case of a 68-year-old man presenting with primary pulmonary amoeba after undergoing chemotherapy for lung adenocarcinoma.Case presentation:In Octob...Background:Primary pulmonary amoeba is very rare and here we report a case of a 68-year-old man presenting with primary pulmonary amoeba after undergoing chemotherapy for lung adenocarcinoma.Case presentation:In October 2016,the man aged 68 was admitted to our hospital because of repeated cough for 8 months and hemoptysis for 1 month.He was diagnosed lung adenocarcinoma and underwent surgery in 2012 without receiving chemotherapy.In March 2016,the patients suffered recurrence of cancer and was treated with chemotherapy.After 2 months of chemotherapy,the patient had consistent cough with white sputum,and chest CT showed a local lung nodule.The physicians suspected that the patient had pulmonary infectious diseases,and he was treated with empirical antibacterial treatment.However,his symptom wasn’t relieved and later the percutaneous lung biopsy found trophozites of Entamoeba histolytica.After administration of metronidazole,the symptoms of the patient were markedly relieved and the lesions were absorbed.Conclusions:In such cases where patients with pulmonary nodules were in immunodeficiency state and had adequate but ineffective anti-bacterial treatment,Entamoeba histolytica infection could be one of the rare causes.Percutaneous lung biopsy should be recommended and specific dying for parasites should be done when necessary.展开更多
基金supported by the Youth Innovation Team of Shaanxi Universities。
文摘The analysis of structure and dynamics in chaotic systems has long been a significant research direction in nonlinear science.Constructing a reliable chaotic system with rich dynamical characteristics is essential for secure communication applications.Existing memristor-based chaotic maps are typically obtained by incorporating discrete mathematical models of memristors into basic chaotic maps.In this study,a simple memristive nonlinear circuit is first designed,from which a memristive oscillator is derived.Subsequently,a memristive map is developed from this oscillator through a linear transformation of the variables.The reliability of the new map is validated through nonlinear dynamic analysis.The results demonstrate that the map exhibits complex nonlinear dynamics under different parameter settings.This finding is beneficial for the construction of memristor maps and the development of image encryption algorithms.
基金supported by the Youth Innovation Team of Shaanxi Universities。
文摘The nonlinear memory characteristics of memristors resemble those of biological synapses and ion channels.Therefore,memristors serve as ideal components for constructing artificial neurons.This paper presents a sound-sensitive neuron circuit featuring a memristor-based hybrid ion channel,designed to simulate the dynamic response mechanisms of biological auditory neurons to acoustic signals.In this neural circuit,a piezoelectric ceramic element captures external sound signals,while the hybrid ion channel is formed by connecting a charge-controlled memristor in series with an inductor.The circuit realizes selective encoding of sound frequency and amplitude and investigates the influence of external electric fields on neuronal ion-channel dynamics.In the dynamic analysis,bifurcation diagrams and Lyapunov exponents are employed to reveal the rich nonlinear behaviors,such as chaotic oscillations and periodic oscillations,exhibited by the circuit during the acoustic–electric conversion process,and the validity of the circuit model is experimentally verified.Simulation results show that by adjusting the threshold of the ratio between electric-field energy and magnetic-field energy,the firing modes and parameters of neurons can be adaptively regulated.Moreover,the model exhibits stochastic resonance in noisy environments.This research provides a theoretical foundation for the development of new bionic auditory sensing hardware and opens a new path for the bio-inspired design of memristor–ion-channel hybrid systems.
基金Project supported by the Gansu Provincial Department of Education University Teacher Innovation Fund Project(Grant No.2024A-168)the Qingyang Science and Technology Plan Project(Grant No.QY-STK-2024B-193)the Horizontal Research Project of Longdong University(Grant No.HXZK2422)。
文摘Biological neurons exhibit a double-membrane structure and perform specialized functions.Replicating the doublemembrane architecture in artificial neurons to mimic biological neuronal functions is a compelling research challenge.In this study,we propose a multifunctional neural circuit composed of two capacitors,two linear resistors,a phototube cell,a nonlinear resistor,and a memristor.The phototube and charge-controlled memristor serve as sensors for external light and electric field signals,respectively.By applying Kirchhoff's and Helmholtz's laws,we derive the system's nonlinear dynamical equations and energy function.We further investigate the circuit's dynamics using methods from nonlinear dynamics.Our results show that the circuit can exhibit both periodic and chaotic patterns under stimulation by external light and electric fields.
文摘Background:Primary pulmonary amoeba is very rare and here we report a case of a 68-year-old man presenting with primary pulmonary amoeba after undergoing chemotherapy for lung adenocarcinoma.Case presentation:In October 2016,the man aged 68 was admitted to our hospital because of repeated cough for 8 months and hemoptysis for 1 month.He was diagnosed lung adenocarcinoma and underwent surgery in 2012 without receiving chemotherapy.In March 2016,the patients suffered recurrence of cancer and was treated with chemotherapy.After 2 months of chemotherapy,the patient had consistent cough with white sputum,and chest CT showed a local lung nodule.The physicians suspected that the patient had pulmonary infectious diseases,and he was treated with empirical antibacterial treatment.However,his symptom wasn’t relieved and later the percutaneous lung biopsy found trophozites of Entamoeba histolytica.After administration of metronidazole,the symptoms of the patient were markedly relieved and the lesions were absorbed.Conclusions:In such cases where patients with pulmonary nodules were in immunodeficiency state and had adequate but ineffective anti-bacterial treatment,Entamoeba histolytica infection could be one of the rare causes.Percutaneous lung biopsy should be recommended and specific dying for parasites should be done when necessary.
