Microscopic mechanisms of magnetization reversal

Two principal scenarios of magnetization reversal are considered. In the first scenario all spins perform coherent motion and an excess of magnetic energy directly goes to a nonmagnetic thermal bath. A general dynamic equation is derived which includes a tensor damping term similar to the Bloch-Bloembergen form but the magnetization magnitude remains constant for any deviation from equilibrium. In the second reversal scenario, the absolute value of the averaged sample magnetization is decreased by a rapid excitation of nonlinear spin-wave resonances by uniform magnetization precession. We have developed an analytic k-space micromagnetic approach that describes this entire reversal process in an ultra-thin soft ferromagnetic film for up to 90^{o} deviation from equilibrium. Conditions for the occurrence of the two scenarios are discussed

Possibility of Geometric Description of Quasiparticles in Solids

New phenomenological approach for the description of elementary collective excitations is proposed. The crystal is considered to be an anisotropic space-time vacuum with a prescribed metric tensor in which the information on electromagnetic crystalline fields is included. The quasiparticles in this space are supposed to be described by the equations structurally similar to the relativistic wave equations for particles in empty space. The generalized Klein-Gordon-Fock equation and the generalized Dirac equation in external electromagnetic field are considered. The applicability of the proposed approach to the case of conduction electron in a crystal is discussed.Comment: 17 pages, latex; to appear in Int. Jnl. Mod. Phy

Decay Properties Of The Dipole Isobaric Analog Resonances

A continuum-RPA-based approach is applied to describe the decay properties of isolated dipole isobaric analog resonances in nuclei having not-too-large neutron excess. Calculated for a few resonances in 90Zr the elastic E1-radiative width and partial proton widths for decay into one-hole states of 89Y are compared with available experimental data.Comment: 8 pages, 4 figures, prepared with RevTe

Impurity relaxation mechanism for dynamic magnetization reversal in a single domain grain

The interaction of coherent magnetization rotation with a system of two-level impurities is studied. Two different, but not contradictory mechanisms, the `slow-relaxing ion' and the `fast-relaxing ion' are utilized to derive a system of integro-differential equations for the magnetization. In the case that the impurity relaxation rate is much greater than the magnetization precession frequency, these equations can be written in the form of the Landau-Lifshitz equation with damping. Thus the damping parameter can be directly calculated from these microscopic impurity relaxation processes

Comparison of basic neurocognitive violations in patients with residual schizophrenia with and without history of ischemic stroke

Relevance. The cognitive symptoms associated with schizophrenia have been a subject of controversy and are often viewed through a dualistic lens. According to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), these cognitive symptoms can be further elucidated within specific neurocognitive domains. Many of the symptoms of schizophrenia manifest behaviorally and can be challenging to differentiate from the consequences of organic brain impairment, especially when these symptoms involve the frontal and temporal cortex or have a diffuse presentation. Aim – to evaluate neurocognitive deficit in patients with residual schizophrenia with history of ischemic stroke. Materials and methods. A comprehensive study was conducted involving 100 patients diagnosed with recurrent schizophrenia (ICD-10: F20.5) at the Communal Non-Profit Enterprise "Regional Clinical Institution for the Provision of Psychiatric Care". We selected 59 patients: 32 patients with residual schizophrenia without history of stroke (Group 1, G1) and 27 patients with residual schizophrenia with history of stroke (Group 2, G2). Neuropsychological testing was used to evaluate neurocognitive violations. Due to massive distortions that brought to testing results by schizophrenia negative symptoms, only general evaluation was made to reflect critical or non-critical to no violations in separate functions. Statistical method of chi-square test was used to compare results in groups.  Study results. To compare neurocognitive violations in G1 and G2 we performed neuropsychological testing in basic neurocognitive domains. G2 patients, diagnosed with both schizophrenia and a stroke, generally exhibit heightened cognitive impairments compared to G1 patients with only schizophrenia. Notably, deficits in Sustained Attention, Divided Attention, Processing Speed, Working Memory, Mental Flexibility, immediate memory, implicit learning, and both expressive and receptive language are more pronounced in G2 patients. However, for functions like Selective Attention, Planning, Decision-Making, recent and very-long-term memory, and interpersonal understanding, the added influence of a stroke in G2 doesn't drastically differentiate them from G1. In essence, while schizophrenia inherently poses cognitive challenges, the co-occurrence of a stroke amplifies certain deficits but not others. This data suggests a complex interplay between schizophrenia and stroke in influencing cognitive function. Conclusions. The coexistence of schizophrenia and a history of stroke in G2 patients frequently exacerbates certain cognitive impairments when compared to those diagnosed solely with schizophrenia. This underlines the compounded cognitive challenges faced by patients with comorbid conditions. However, for some cognitive domains, the severity of impairments is primarily governed by schizophrenia, irrespective of the presence of an additional stroke history. This comprehensive analysis underscores the complex interplay of multiple conditions on cognitive function and emphasizes the importance of individualized care and intervention strategies tailored to the specific cognitive challenges faced by each patient group

Preparation of Pedagogical Shots Taking Into Account Interdisciplinarity and Convergence of Sciences and Technologies

В статье представлена проблема подготовки педагогов совмещенных профилей «Математика» и «Информатика», связанная с конвергенцией наук и технологий. В настоящее время на науку и образование оказывают влияние глобальные процессы, что приводит к появлению понятий «глобализация образования» и «международная образовательная среда». Эти понятия связываются с понятием «конвергенция образования». В связи с этим, необходимо проведение соответствующих мероприятий по подготовке к реализации и непосредственной реализации нового типа образования. Целью статьи является рассмотрение подготовки педагогов совмещенных профилей «Математика» и «Информатика» с учетом с конвергенции наук и технологий. Описаны некоторые подходы к определению конвергенции. Отмечена важность совершенствования подготовки педагогических кадров по совмещенным профилям с учетом возросшей роли междисциплинарности. Представлены результаты проведенного анализа содержания школьных курсов математики и информатики, показывающие целесообразность использования методов математики (численные методы, метод математического моделирования, метод вычислительного эксперимента, методы математической логики, методы математической статистики, функционально-графический метод) в процессе изучения информатики.The problem of training of teachers of the combined Mathematician and Informatics profiles connected with convergence of sciences and technologies is presented in article. Now global processes exert impact on science and education that leads to emergence of the concepts "education globalization" and "international educational environment". These concepts contact the concept "education convergence". In this regard, holding the relevant activities for preparation for realization and direct realization of new type of education is necessary. The purpose of article is consideration of training of teachers of the combined Mathematician and Informatics profiles taking into account from convergence of sciences and technologies. Some approaches to convergence definition are described. Importance of improvement of preparation of pedagogical shots on the combined profiles taking into account the increased interdisciplinarity role is noted. The results of the carried-out analysis of maintenance of school courses of mathematics and informatics showing expediency of use of methods of mathematics (numerical methods, a method of mathematical modeling, a method of a computing experiment, methods of mathematical logic, methods of mathematical statistics, a functional and graphic method) in the course of studying of informatics are presented

Regulatory tools of the financial and economic stability improvement of social and economic relations subjects functioning

Досліджено теоретичні питання підвищення фінансово-економічної стабільності функціонування суб’єктів суспільно-економічних відносин.Исследованы теоретические аспекты повышения финансово-экономической стабильности функционирования субъектов общественно-экономических отношений.The theoretical aspects of the financial and economic stability improvement of social and economic relations subjects functioning were investigated