PLASMON SOLITONS, KINKS AND FARADAY WAVES IN TWO-DIMENSIONAL LATTICE OF METAL NANOPARTICLES

We consider nonlinear discrete modes in a two-dimensional lattice of metallic nanoparticles driven by optical radiation at a frequency close to the frequency of the surface plasmon resonance of an individual nanoparticle. We suppose that the particles are small enough and the interparticle distance is large enough to treat nanoparticle within point-dipole approximation. We also assume that nanoparticles are made of silver and possess an intrinsic nonlinear Kerr-type response. Since each particle acts as a resonantly excited oscillator with slow (in comparison with the light period) inertial response, we employ a slowly varying amplitude approach to describe dynamical behavior of particle polarizations. Following a standard linear stability analysis, we obtain areas of bistability and modulation instability for the homogeneous stationary solution of the corresponding dynamical system in the plane ‘intensity-frequency’. Based on these data, we present and analyze examples of generation of plasmonic Faraday waves, stable two-dimensional solitons, oscillons, and kinks (switching waves), which separate two different homogeneous states of particle polarizations. We also discuss realistic duration of the laser pulse which should be large enough to cause the formation of the considered nonlinear modes and small enough to prevent particle ablation

Certain features of using modified collagen-containing raw materials with prolonged shelf life in food technology

In the current circumstances, trends in nutrition of a person striving to lead a healthy life-style require intake of meat products with the reduced energy value, minimal amounts of fat, increased protein mass fraction, presence of substances improving homeostasis of the body. The synergism of the modern nutrition science and meat industry enables creating food products that satisfy consumers’ demand. Today, in the Russian Federation, a theoretical and practical base of the technology development has been collected to the full extent in the field of rational processing of secondary raw materials in the food industry, optimal use of animal secondary raw materials, study of the protein ingredients of animal and plant origin and their deep scientifically substantiated processing, improvement of technological processes and equipment, and correspondently, product range extension. The paper broadens the information about the modified collagen-containing raw materials (cattle rumen), examines physico-chemical characteristics of the collagen-containing raw material and its changes in the process of freeze-drying with a special attention paid to the study of changes in the histological structure. The presence of the relatively uniform fibrillar structure was determined, which facilitated discovering the functional potential of proteinoids that form the fibrillar matrix in the composition of products from different groups. Analysis of IR-spectra revealed several significant absorption bands linked with the state of peptide bonds. The character of bands is linked with the complex of valence and deformation vibrations of the N- and С- types. It is believed that IR-spectra reflect conformations in the protein secondary structure, which suggests preserving properties of the tropocollagen particle or collagen molecule. Freeze-dried modified collagen-containing cattle rumen was tested by the example of jellies. The obtained databank broadens information about physico-chemical properties of modified collagen-containing raw materials (cattle rumen).In the current circumstances, trends in nutrition of a person striving to lead a healthy life-style require intake of meat products with the reduced energy value, minimal amounts of fat, increased protein mass fraction, presence of substances improving homeostasis of the body. The synergism of the modern nutrition science and meat industry enables creating food products that satisfy consumers’ demand. Today, in the Russian Federation, a theoretical and practical base of the technology development has been collected to the full extent in the field of rational processing of secondary raw materials in the food industry, optimal use of animal secondary raw materials, study of the protein ingredients of animal and plant origin and their deep scientifically substantiated processing, improvement of technological processes and equipment, and correspondently, product range extension. The paper broadens the information about the modified collagen-containing raw materials (cattle rumen), examines physico-chemical characteristics of the collagen-containing raw material and its changes in the process of freeze-drying with a special attention paid to the study of changes in the histological structure. The presence of the relatively uniform fibrillar structure was determined, which facilitated discovering the functional potential of proteinoids that form the fibrillar matrix in the composition of products from different groups. Analysis of IR-spectra revealed several significant absorption bands linked with the state of peptide bonds. The character of bands is linked with the complex of valence and deformation vibrations of the N- and С- types. It is believed that IR-spectra reflect conformations in the protein secondary structure, which suggests preserving properties of the tropocollagen particle or collagen molecule. Freeze-dried modified collagen-containing cattle rumen was tested by the example of jellies. The obtained databank broadens information about physico-chemical properties of modified collagen-containing raw materials (cattle rumen)

Wernicke encephalopathy after sleeve gastrectomy

The article describes the case of a patient with Wernicke encephalopathy, which developed 3 months after the sleeve gastrectomy. An MRI of the brain was performed to verify the diagnosis, which revealed a symmetrical non-uniform increase in the MR signal on T2-WI and Tirm from the medial part of the thalamus, mastoid bodies and gray matter around the aqueduct of Sylvius. Thiamine infusion was promptly initiated as therapy. During treatment, acute neurological symptoms almost regressed, the patient was discharged in a satisfactory condition with preservation of vertical nystagmus under the supervision of specialists at the place of residence. Wernicke–Korsakoff syndrome more often occurs as a complication of alcoholism and arising from thiamine deficiency. However, the fact that this condition also occurs under the influence of other etiopathogenetic factors is often ignored by clinicians. In the management of patients after bariatric interventions, this condition is much more common in malabsorptive operations. However, a combination of certain factors can be described in patients after restrictive types of bariatric surgeries

Comparative Analysis of Clinical, Hormonal and Morphological Studies in Patients with Neuroendocrine ACTH-Producing Tumours

This paper highlights the problem of neuroendocrine tumours (NETs) with clinical symptoms of hypercorticism caused by hypersecretion of adrenocorticotropic hormone (ACTH) by tumour cells. In most cases (85%), the tumours were localized in the pituitary gland (Cushing's disease); 15% of the patients had an extrapituitary tumour that manifest as an ectopic ACTH secretion (EAS). Comparative analysis of clinical, hormonal, histological, and immunohistochemical characteristics of pituitary and extrapituitary ACTH-secreting NET was performed. It included 46 patients with CD and 38 ones exhibiting ectopic ACTH secretion (EAS). Results of the study suggest differences between CD and EAS in terms of the severity of clinical manifestations and duration of the disease. Hormonal studies showed that EAS unlike CD was associated with high plasma ACTH and cortisol levels, late-evening salivary cortisol and daily urinary free cortisol, the absence of a 60% or greater reduction of cortisol in the HDDST test, and the presence of a low (less than 2) ACTH gradient in response to desmopressin administration with catheterization of cavernous sinuses. The study of morphofunctional characteristics of the removed NET demonstrated the ability of both pituitary and extrapituitary NETs to express ACTH as well as GH, PRL, LH, and FSH. The angiogenic markers (CD31 and VEGF) were detected with equal frequency regardless of the NET localization. The histological structure of all corticotropinomas suggested their benign origin, but extrapituitary NETs were represented by different morphological types with varying malignancy, invasiveness, and metastatic properties. A higher cell proliferation potential (Ki-67) was documented for NET in patients presenting with an ectopic ACTH secretion compared to those having corticotropinomas

Mathematical model of the competition life cycle under limited resources conditions: Problem statement for business community

Present study is devoted to the development of competition life cycle mathematical model in the closed business community with limited resources. Growth of each agent is determined by the balance of input and output resource flows: input (cash) flow W is covering the variable V and constant C costs and growth dA/dt of the agent's assets A. Value of V is proportional to assets A that allows us to write down a first order non-stationary differential equation of the agent growth. Model includes the number of such equations due to the number of agents. The amount of resources that is available for agents vary in time. The balances of their input and output flows are changing correspondingly to the different stages of the competition life cycle. According to the theory of systems, the most complete description of any object or process is the model of its life cycle. Such a model describes all stages of its development: from the appearance ("birth") through development ("growth") to extinction ("death"). The model of the evolution of an individual firm, not contradicting the economic meaning of events actually observed in the market, is the desired result from modern AVMs for applied use. With a correct description of the market, rules for participants' actions, restrictions, forecasts can be obtained, which modern mathematics and the economy can not give. © 2017 Author(s).15-06-04863Present study was carried out under financial support of the Russian Fund of Fundamental Research grant № 15-06-04863 "Mathematical models of local payment system lifecycles"

Model for determining the competitive identity of cities in a digital economy

The term competitive identity of cities was introduced by Enholt [1] when considering the notion of territory marketing. Such an indicator is significant for determining the investment attractiveness of the territorial entity, and as a consequence of the opportunities for the development of the Territory and its directions. The assessment and prospects for the development of territories are determined by a set of indicators that are quite stable in time, then it is necessary to determine how to predict the directions for improving the efficiency of investment policy, including in the transition to the digital economy. © 2020 American Institute of Physics Inc.. All rights reserved

Forecasting the development of mechanical engineering using the system dynamics method

At modern conditions of world economy tendencies, the connections between subjects of economy are becoming more difficult and closer. In particular, if in the past were spread hard forms of private ownership of enterprises at present-day world is going conversion to more flexible and mobile composition of subjects' activities. Computer simulation modeling is giving the best results at the areas were the participants of social and economic activities are spending significant efforts and sufficiently much time for visuality playing and analysis of possible variants of the development of the events. The more difficult is the situation the more objects, factors, and possible variants of events' progress is necessary to play in different combinations between together and bigger effect possible to expect from application of simulation model for analyzing of the situation and for searching and making optimized decisions. The application of system dynamics method allows executing forecasting of economic agents including the sectors of economy. © 2020 American Institute of Physics Inc.. All rights reserved

EFFECTIVENESS OF EDUCATIONAL PROGRAMS ON EARLY DIAGNOSIS OF ANKYLOSING SPONDYLITIS FOR PRIMARY CARE PHYSICIANS IN KAZAN

The diagnosis of ankylosing spondylitis (AS) in the real-life practice is delayed for 7–8 years on average. Educational programs for primary care physicians may promote the disease diagnosis. Objective. To analyze the effectiveness of the educational programs for the early diagnosis of AS for primary contact physicians in the real-life clinical practice in Kazan. Material and methods. The development of the educational programs and determination of their effectiveness com- prised three stages: 1) determination of the level of knowledge and problems in the diagnosis and treatment of AS among primary care physicians and neurologists; 2) development of educational programs suitable to be used in the real-life clinical practice; 3) analysis of the effectiveness of implementing the programs according to the reports on work of the City Rheumatology Center in 2009–2011. Results. After running the courses, the number of patients with AS at the Kazan City Rheumatology Center increased almost twofold, from 378 in 2009 to 683 in 2011; the period from the onset of the disease to diagnosis was simultane- ously reduced from 8.4 to 3.5 years. Conclusion. The educational programs for primary care physicians and neurologists in Kazan have promoted shorten- ing of the AS diagnosis time

System-dynamic modeling of the development of universities in the conditions of informatization

The work is devoted to the selection of key performance indicators (KPI) of universities, as well as the development of the concept of using these indicators in assessing the effectiveness of universities in the scientific and innovative sector of Russia. The study used a combination of descriptive and deductive methods, as well as experiment. There were analyzed the data on financing, the number of publications indexed in the Web of Science, as well as the number of employees of 14 Russian universities that have been participating since 2013 in the state program "Project 5-100". This program is aimed at the adaptation of Russian universities to international standards and incorporating them into international education environment. A system-dynamic model is constructed that allows, on the basis of the key performance indicators, to find new approaches and ways to achieve the goals set and to build an effective university development strategy in the transition to a digital economy. © 2020 American Institute of Physics Inc.. All rights reserved

Comparison of gingival retraction methods

Dentists use materials for retraction of the gingival sulcus daily in their practice. Effective gingival retraction prior to taking an impression without damaging periodontal tissues is very important for the long-term success of restorative treatment. The article analyzes the most commonly used methods of retractionВрачи-стоматологи ежедневно применяют в своей практике ретракцию десневой борозды. Эффективная ретракция десны до снятия оттиска без повреждения тканей пародонта очень важна для долгосрочного успеха реставрационного лечения. В статье проведен анализ наиболее часто используемых методов ретракци