70 research outputs found
Non-Linear Processes in 1D Quantum Spin Ordered System under Strong Magnetic Field Pulse
Investigation of an exactly integrable quantum model of 1D magnetic (which is equivalent to a massive fermion system) is presented. It has been shown that under certain conditions a spin system will not absorb power from the strong homogeneous magnetic field pulse
Self-Induced Transparency in 1D Magnetics
The evolution of spin system with the Fermi character of the relevant excitations under the strong magnetic field pulse is presented. The nonlinear dynamic equations describing interaction of the system and external magnetic field are found. It is shown that under certain conditions the initial state of the resonantly absorbing system does not change after passing of the field pulse (similar to optical self-induced transparency in two-level molecular gas)
ELECTRIC CLINICAL SEMIOLOGY AND CHRONOLOGIC FEATURES OF EPILEPTIC SEIZURES, ASSOCIATED WITH FOCAL EPILEPSY IN CHILDREN WITH STRUCTURAL CHANGES IN BRAIN AND BENIGN EPILEPTIFORM PATTERNS ON EEG
Study is dedicated to investigation of clinical, electroencephalographic features and chronologic peculiarities of epileptic seizures, associated with focal epilepsy in children with structural changes of brain and benign epileptiformic patterns on EEG. We observed 61 patients at age of 3-22 years old (medium age 11,64 years±4,54). Our study demonstrated the prevalence of secondary generalized seizures (40,9% of cases), focal clonic seizures (37,7% of cases), seizures, coming from occipital cortex. Epileptic seizures were observed at night time (85,3% of cases). In 65,6% of cases seizures were associated only with dream (periods of asleeping, dream and awakening) and were not occuring in wakefulness. In 19,7% of patients seizures occurred in dream as well as in wakefulness. Most often (in 54,1% of patieпts) rare seizures, occurring several time in an year (31,2% of cases), or in single cases in whole period of disease (22,9%)
KABUKI SYNDROME WITH EPILEPSY: CLINICAL CASE
Kabuki syndrome is rare genetic disorder. Patients with this syndrome are phenotypically similar to Kabuki actors. The authors present a review article which describes the history, etiology, clinical features, diagnosis, and approaches to therapy of this syndrome. Special attention is description of a clinical case of Kabuki syndrome. Particularities of epilepsy clinical course, EEG patterns and treatment of girl with this syndrome were examine
HYPOMELANOSIS OF ITO WITH EPILEPSY: TWO CASES IN CLINICAL PRACTICE
Hypomelanosis of Ito (HI) is rare genetic disorder of the phakomatoses group. Authors represent literature review on the history of the HI description, etiology, clinical features, diagnosis, and approaches to therapy. Special attention is description is characteristics of epilepsy and EEG to HI. We also discuss different approaches to the treatment of epilepsy. So HI is rare disease the authors carried out a comparative analysis of the observed two patients with HI and epilepsy with literature data
Mathematical Simulation of the Transformer Differential Protection, Based on the Time-Impulse Principle
The modern electric power systems (EPS) are large, multi-parameter, stiff, non-linear and dynamic systems. Control and protection of such systems are extremely complex and urgent tasks. It is confirmed by the statistic of accidents in EPS: about 25 % of severe accidents are caused by wrong actions of relay protection (RP) and automation of EPS. The 30 % of these incorrect actions are caused by inadequate setting. The goal of this work is to solve the problem of RPs setting through the usage of detailed models that take into account specific features of the RPs and processes in transducers. The paper focused on the solution of the problem for the transformer differential protection (TDP), based on the impulse-time principle – DZT-21/DZT-23. The presented research results confirm the effectiveness of the usage of the appropriate mathematical models for the problem solution. The presented fragments are a part of a single project aimed at the problem’ solution for all the RPs devices
Mathematical Simulation of the Transformer Differential Protection, Based on the Time-Impulse Principle
The modern electric power systems (EPS) are large, multi-parameter, stiff, non-linear and dynamic systems. Control and protection of such systems are extremely complex and urgent tasks. It is confirmed by the statistic of accidents in EPS: about 25 % of severe accidents are caused by wrong actions of relay protection (RP) and automation of EPS. The 30 % of these incorrect actions are caused by inadequate setting. The goal of this work is to solve the problem of RPs setting through the usage of detailed models that take into account specific features of the RPs and processes in transducers. The paper focused on the solution of the problem for the transformer differential protection (TDP), based on the impulse-time principle – DZT-21/DZT-23. The presented research results confirm the effectiveness of the usage of the appropriate mathematical models for the problem solution. The presented fragments are a part of a single project aimed at the problem’ solution for all the RPs devices
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