bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamic damping under introduction of additional couplings and external actions
Authors: Eliseev S. V. , Mironov A. S. , Vuong Quang Truc 
Published: April 2019

Introduction.The dynamic interaction features in mechanical oscillating systems, whose structure includes additional couplings, are considered. In practice, such cases occur when using various optional mechanisms and motion translation devices under the formation of technical objects. The study objective is to develop a method for constructing mathematical models in the problems of dynamics of the mechanical oscillating systems with optional devices and features in the system of external disturbing factors.Materials and Methods. The techniques used to study properties of the systems and the dynamic effects are based on the ideas of structural mathematical modeling. It is believed that the mechanical oscillating system, considered as a design model of a technical object, can be compared to the dynamically equivalent automatic control system. The mathematical apparatus of the automatic control theory is used.Research Results.A method for constructing mathematical models is developed. The essential analytical relations for plotting oscillating systems are obtained, which enable to form a methodological basis for the integral estimation and comparative analysis of the initial system properties in various dynamic states. Dynamic properties of the two-degree-offreedom systems within the framework of the computer simulation are investigated. The implementability of dynamic oscillation damping mode simultaneously in two coordinates with the joint action of two in-phase kinematic perturbations in the mechanical oscillating systems is shown.Discussion and Conclusions.The possibilities of new dynamic effects, which are associated with the change in the system structure under certain forms of dynamic interactions, are noted. The study is of interest to experts in machine dynamics, robotics, mechatronics, nano and mesomechanics.
Study on stationary solutions to the problem of phytoplankton dynamics considering transformation of phosphorus, nitrogen and silicon compounds
Authors: Belova Yu. V. , Atayan A. M. , Chistyakov A. E. , Strazhko A. V. 
Published: April 2019

Introduction.The solution to the problem of transformation of phosphorus, nitrogen and silicon forms is studied. This problem arises under modeling phytoplankton dynamics in shallow-water bodies including the Azov Sea. The phytoplankton dynamics model is formulated as a boundary value problem for the system of diffusion-convection-response equations and takes into account the absorption and release of nutrients by phytoplankton, as well as the transition of nutrients from one compound to another. To calculate the initial conditions and parameters of the equations under which the steady-state regime occurs, the software is developed, which is based on the model describing changes in phytoplankton concentrations without considering current effects. This model is represented by a system of inhomogeneous differential equations. Based on the developed software, the initial conditions and parameters of the phytoplankton dynamics model in the Azov Sea are calculated experimentally.Materials and Methods.A 3D model of phytoplankton dynamics is considered taking into account the transformation of phosphorus, nitrogen and silicon compounds based on the system of nutrient transport equations. The case of a spatially uniform distribution of substances is considered to specify the parameters of the model at which the stationary modes occur. Because of simplification, a system of ordinary differential equations solved through the Runge-Kutta method is obtained.Research Results. The software is developed to specify the initial conditions and parameters of the phytoplankton dynamics model considering the transformation of phosphorus, nitrogen and silicon compounds. Several numerical experiments are performed under the assumption that the development of phytoplankton is limited by a single biogenic substance. As a result of the computational experiment, it can be seen that with the obtained values of the initial concentrations and parameters of the equations, stationary modes occur for the system of ordinary differential equations describing the case of the spatially uniform distribution of substances.Discussion and Conclusions.The mathematical model of the transformation of phosphorus, nitrogen and silicon forms in the problem of phytoplankton dynamics is studied. Stationary modes for the system of ordinary differential equations are obtained, for which the values of the system parameters and initial conditions are determined. The results obtained can be used in further simulation of the phytoplankton dynamics considering the transformation of phosphorus, nitrogen and silicon compounds with account for convection-diffusion, salinity, and temperature.
Development of digital twin of CNC unit based on machine learning methods
Authors: Kabaldin Yu. G. , Shatagin D. A. , Anosov M. S. , Kuzmishina A. M. 
Published: April 2019

Introduction. It is shown that the digital twin (electronic passport) of a CNC machine is developed as a cyber-physical system. The work objective is to create neural network models to determine the operation of a CNC machine, its performance and dynamic stability under cutting.Materials and Methods. The development of mathematical models of machining processes using a sensor system and the Industrial Internet of Things is considered. Machine learning methods valid for the implementation of the above tasks are evaluated. A neural network model of dynamic stability of the cutting process is proposed, which enables to optimize the machining process at the stage of work preparation. On the basis of nonlinear dynamics approaches, the attractors of the dynamic cutting system are reconstructed, and their fractal dimensions are determined. Optimal characteristics of the equipment are selected by input parameters and debugging of the planned process based on digital twins.Research Results. Using machine learning methods allowed us to create and explore neural network models of technological systems for cutting, and the software for their implementation. The possibility of applying decision trees for the problem of diagnosing and classifying malfunctions of CNC machines is shown.Discussion and Conclusions. In real production, the technology of digital twins enables to optimize processing conditions considering the technical and dynamic state of CNC machines. This provides a highly accurate assessment of the production capacity of the enterprise under the development of the production program. In addition, equipment failures can be identified in real time on the basis of the intelligent analysis of the distributed sensor system data.
Production machines maintenance based on digitalization
Authors: Tugengold A. K. , Voloshin R. N. , Yusupov A. R. , Kruglova N. P. 
Published: April 2019

Introduction.Digital data and analytics transform the role of the production equipment maintenance. Analytical information of sensors placed on the product allows continuous monitoring of the production machines operation and their timely servicing. Thus, defects in technical equipment are identified, the analysis of which enables to develop algorithms for monitoring and forecasting, and to prevent equipment from overshooting the limits of the safe operation.Materials and Methods.Basic digitalization principles and the digital images structure are presented. A mathematical method is used to describe the digital image vector and the control system algorithm.Research Results.The achievements of the known systems of maintenance and digitalization of various machines are summarized. The application of a dynamic digital image made it possible to determine the desired levels of the production facilities maintenance. An optional version of monitoring the equipment state within the framework of the production digitalization concept is shown. It is based on the proposed algorithm for an autonomous control of the process state.Discussion and Conclusions.The construction of machine digital images in accordance with the main stages of its life cycle is described. The task of automated maintenance of machine tools based on digitalization is considered.
ÉTUDE DES CRISES POLITIQUES INTERNATIONALES ET INTERDISCIPLINARITE : LE CAS DU 11 SEPTEMBRE 2001
Authors: MESZAROS Thomas , MORIER Clément 
Published: April 2019

Interdisciplinarity and International Political Crisis Studies: the Case of 9/11. This study aims to work the concept of political crisis using interdisciplinary tools. It is based on a case study, the crisis of the September 11 attacks, analyzed according to two complementary approaches. First, the breakdown of the sequences of this crisis makes it possible to identify the development of the intensity of the phenomenon over time, and its phases, in order to observe the behavior of the different types of actors involved in the crisis. Then, we have to study the dynamic morphology that shapes the deployment of the crisis, from the point of view of the aggressor, but also from the target, using René Thom’s Catastrophe Theory. This accounts for the internal functioning of these actors, and also, shows crisis management opportunities for the target of these attacks. The purpose of this work is to put forward the relevance of interdisciplinarity to think political crises, and to put interdisciplinarity into practice in order to improve the knowledge of a phenomenon in a specific field (political crisis), by studying with another one.
Factors associated with postobstructive diuresis following decompressive surgery with placement of ureteral stents or subcutaneous ureteral bypass systems for treatment of ureteral obstruction in cats: 37 cases (2010–2014)
Authors: Balsa Ingrid M. , Culp William T. N. , Palm Carrie A. , Hopper Kate , Hardy Brian T. , Ben-Aderet Daniel G. , Mayhew Philipp D. , Drobatz Kenneth J. 
Published: April 2019

Abstract

OBJECTIVE
To describe postobstructive diuresis (POD) in cats undergoing surgical placement of ureteral stents or subcutaneous ureteral bypass systems for treatment of ureteral obstruction in cats and to identify factors associated with duration and maximum severity of POD.

DESIGN
Retrospective case series.

ANIMALS
37 client-owned cats with ureteral obstruction treated between August 2010 and December 2014.

PROCEDURES
Medical records were reviewed, and data extracted included signalment, history, results from physical examinations and clinical laboratory analyses, treatment, urine output, and outcome. Data were evaluated to identify factors associated with POD duration and maximum severity, alone or in combination.

RESULTS
Serum concentrations of creatinine, potassium, phosphorus, and BUN before surgery positively correlated with duration and maximum severity of POD. Absolute changes in serum concentrations of creatinine, potassium, and BUN from before surgery to after surgery positively correlated with POD duration. Cats with anuria before surgery had longer POD than did other cats; however, there was no difference in POD duration or maximum severity with unilateral versus bilateral ureteral obstruction. Thirty-four of 37 (92%) cats survived to hospital discharge, which was not associated with whether ureteral obstruction was unilateral or bilateral. Azotemia resolved in 17 of the 34 (50%) cats that survived to hospital discharge.

CONCLUSIONS AND CLINICAL RELEVANCE
Results of the present study indicated that several factors were associated with POD duration and maximum severity, alone or in combination, and that with intensive management of fluid and electrolyte derangements, regardless of the extent of the original azotemia, a high percentage of cats survived to hospital discharge.
Domestic Debt and Economic Growth in Nigeria: An ARDL Bounds Test Approach
Authors: Ibrahim Ayuba K. , Khan Shazida Mohd 
Published: April 2019

Abstract
The study examines the long-run relationship between domestic debt and the fiscal policy of economic growth in Nigeria in the period from 1981 to 2013 owing to government reforms in the financial system, particularly due to the establishment of the Debt Management Office (DMO) in 2000 and a new fully funded pension fund scheme, both of which resulted in a resurgence of the debt market. The issue that is often raised is the doubt regarding the stability of the debt and its likely implications for the economy, as well as the unpleasant consequences for the government embarking on consolidation. The study employs the autoregressive distributed lag (ARDL) approach and the bounds test as proposed by Narayan (2005), anchored on the perspective of the endogenous growth theory. The results reveal that although overall the adverse negative domestic debt hurts the economy, it has a positive effect on the total aggregate government revenue and economic growth in Nigeria in the research period. Furthermore, the paper develops a system to assess the speed of the adjustment mechanism coefficient in an error correction model (ECM).
Spontaneous regression of severe aortic stenosis after massive embolization in a patient with antiphospholipid syndrome
Authors: Youssef Ali , Alrefae Mustafa , Abouelsoud Sayed 
Published: April 2019

Summary
We present a case of probably unreported aortic stenosis evolution in a patient with primary antiphospholipid syndrome (APS). A female patient, 54 years old, with a history of recurrent deep venous thrombosis, an episode of pulmonary embolism and was positive for APS antibodies. She was kept on warfarin and aspirin. The patient was admitted with acute pulmonary edema and severe aortic stenosis. While preparing for aortic valve surgery, the patient developed acute stroke, and a week later developed concurrent acute ischemia of both lower limbs. Emergency surgery salvaged the lower limbs and follow up transthoracic echocardiography showed marked regression of the thickening of the aortic valve leaflets, only mild aortic stenosis and moderate aortic regurgitation. Aortic valve surgery was cancelled, and the patient was kept on warfarin and aspirin.

Conclusion

Development of severe aortic stenosis is uncommon in primary APS, and this scenario of spontaneous improvement from a severe to a mild aortic stenosis, is probably unreported before.
Применение препарата протромбиного комплекса Октаплекс при различных кровотечениях у больных с дефицитом фактора Х
Authors: Кадымова Э. А. , Юсифова Н. Я. , Ализаде Г. А. , Эфендиева Г. М. 
Published: April 2019

Актуальность адекватного лечения различных кровотечений у больных с коагулопатиями обусловлено широким распространением этого состояния при дефицитах различных факторов сворачиваемости крови.
Целью кастоящего исследования было изучения результатов применения препарата протромбинового комплекса Октаплекс у больных с дефицитом Х фактора и у больных с приобретенной формой гемофилии.
Материалы и методы исследования Под нашим наблюдением было 27 больных дефицитом фактора Х. Все больные с различными формами кровотечения находились на стационорном лечении и диспансерном наблюдении в Республиканском центре гемофилии гор. Баку Азербайджанской Республики. Исследование имело ретроспективный характер. Для оценки гемостаза были использованы следующие параметры лабораторных исследований: активность факторов крови VIII, VII, Xи др, АЧТВ, ПИ, ПВ, ИНР, время кровотечения по Li Uayt, фибриноген.
Mnemoniklər və yaddaş üçün digər koqnitiv vasitələr tibbi təhsildə və gündəlik həkim praktikasında
Authors: Mirzəyev Sahil 
Published: April 2019

Zəmin. Ədəbiyyata baxış keçirilərək bəzi xəstəliklərin diaqnostikasına yardım üçün Azərbaycan dilində köməkçi yaddaş vasitələrinin (“mnemonik”) istifadəsinin mümkünlüyü nəzərdən keçirildi.
Material və Metodlar. Bizim tərəfimizdən aidiyyəti olan kliniki təlimatlara, orijinal məqalələrə, monoqrafiya və rəhbərliklərə baxış keçirilmişdir. Əsasən son 10 ildə dərc olunmuş materiallara diqqət verilmişdir.
Məqsəd: Qəfil ürək dayanmasının (asistoliya və nəbzsiz elektrik aktivliyi) geri dönə bilən səbəbləri və aurasız epizodik miqren timsalında patoloji vəziyyətlərin diaqnostikası ilə bağlı yaddaşa köməkçi vasitələrin (“mnemonik” və digər koqnitiv yardımçı vasitələr) təklif edilməsi
Nəticə: Cəld diaqnostikaya kömək məqsədilə Azərbaycan qədim mifologiyasına əsasən yaradılışın 4 ünsürü (su, od, yel və torpaq) qəfil ürək dayanmasının geri dönə bilən səbəblərinin, “həssas PUMA” mnemoniki isə aurasız epizodik miqrenin diaqnostik meyarlarının yadda saxlanması üçün istifad edilə bilər
Məhbuslar arasinda İİV və C virus hepatiti ko-infeksiyalarının çoxsaylı dərmanlara davamlı vərəmli xəstələrin müalicə nəticələrinə təsiri
Authors: Məmmədov R. , Babazadə S. , Hüseynov F. , Rəcəbov T. , Hacızadə G. , Kərimova N. 
Published: April 2019

Vərəm dünyada mövcud olan ölümcül xəstəliklərdən biridir. Heç bir zaman bu xəstəlik bugünkü kimi geniş yayılmamışdır. Əhalinin sayının artması, İİV infeksiyası və digər tibbi və sosial faktorlar xəstələnmə hallarının artmasına təsir edir.
Vərəm mikobakteriyalarının ən azı izoniazid (İNH) və rifampisinə (RMP) (iki ən güclü vərəm əleyhinə olan dərman) qarşı olan davamlılığı kimi təyin olunan DDV sürətlə artan və çətinliklə müalicə (müalicə uzunmüddətlidir, dərmanlar bahalı və toksikdir) olunan xəstəlikdir.
ÇDDV-nin müalicəsi üçün bir çox ölkələrdə göstərilən səylərə baxmayaraq son zamanlar dünya miqyasında GDDV-nin artması (GDDV və ya Geniş Dərmanlara Davamlı Vərəm, ftorxinolonlara və kanamisinə, və ya amikasinə və ya kapriomisinə qarşı rezistentlik kimi tərif olunur) belə bir fikir yaratmışdır ki, ÇDDV-nin qeyri-adekvat müalicəsindənsə, heç bir müalicə aparmamaq daha yaxşıdır. ÇDDV-nin başvermə halları az olan bəzi ölkələrdə ümumi əhali ilə müqayisədə məhbuslar arasında vərəmə yoluxma riski yüksəkdir. Bu hallar vərəmin yüksək dərəcəli transmissiyası ilə bağlıdır və buda infeksiyaya nəzarət mexanizmlərinin zəifliyi və/və ya əhalinin həssas qruplarının sıx konsentrasiyası ilə əlaqəlidir. Bir sıra koinfeksiyalar ÇDDV-nin müalicəsinin nəticələrinə təsir edir, lakin bu təsirin hansı dərəcədə olduğu hələ də tam aydın deyildir. Məhbuslar arasında ÇDDV-nin gedişində İİV, HBV və HCV-nin ko-infeksiyalarının rolunu və əhəmiyyətini öyrənmək üçün tədqiqatın aparılması qərara alındı.
Məqsəd: operativ tədqiqatın məqsədi ÇDDV-nin uğursuz müalicə nəticələrinin təhlili və onunla əlaqəli olan risk faktorlarının təyini.
Efectos de la aplicación de tecnologías de información y comunicación – TIC, en los resultados de empresas PyME del sector agrícola chileno
Authors: Di Biase D. Francisco , Montedónico Q. Bruno , Ortega T. Hugo , Fernández Diego 
Published: April 2019

RESUMENEn Chile, el uso de TIC para la gestión de predios agrícolas es escaso y recién se está comenzando a comprender la utilidad de esta herramienta. Las empresas que utilizan información, sin importar si esta es obtenida en forma manual o computacional, efectivamente tienen un mejor rendimiento y un mejor resultado económico. Según nuestro estudio, los agricultores que usan TIC mayoritariamente son los de menor edad, los de mayor escolaridad y son los que se preocupan además de los aspectos productivos, de la gestión comercial y administrativa.Palabras clave: información, gestión, TIC, resultado económico, pequeña agricultura. Effects of the Implementation of Information and Communication Technology – ICT, in the economic performance enterprises in the chilean agricultural sector SME’sABSTRACTIn Chile, the use of ICT’s for the management of the land is scarce and is only now beginning to understand the usefulness of this tool. Companies that use information, regardless of whether this is obtained by hand or computer, actually have better performance and better economic performance. In our study, farmers who use ICTs are mostly younger, more educated and those who care are in addition to the productive aspects of business management and administration.Keywords: information, management, ICT’s, economic performance, small farmers
La progresiva construcción de un nuevo paradigma de política social en Venezuela
Authors: Mateo Tomé Juan Pablo 
Published: April 2019

RESUMENEn este artículo se analiza el desarrollo de la política social por parte del gobierno de Venezuela en la última década, desde la perspectiva del nuevo paradigma que se intenta configurar para lograr la efectiva universalidad de los derechos sociales. Para ello se expondrán los rasgos esenciales de la política social implementada por los gobiernos anteriores, el contexto sociopolítico y el programa económico gubernamental, junto con una cuantificación del gasto social, lo cual permitirá identificar las rupturas y continuidades existentes. Asimismo, el estudio aborda tres ámbitos de la política social: la educación, la sanidad y la alimentación.Palabras clave: gasto social, educación, sanidad, alimentación, misiones sociales. The progressive construction of a new social policy paradigm in Venezuela.ABSTRACTThis article analyzes the development of the social policy by the Venezuelan government in the last decade, from the perspective of the new paradigm, which is tentatively assembled to achieve the effective universalization of the social rights. For this purpose, we will expose the essential features of the social policy developed by prior governments, the social-politic context and the governmental economic program, alongside a quantification of the social expenditure, which will allow to identify the existing ruptures and continuances. Furthermore, it addresses three areas of the social policy: education, health and nutrition.Keywords: social expenditure, education, health, nutrition, social mission.
Importancia del comercio de México con EU y Canadá a partir del programa CAN
Authors: Gracia Hernández Maximiliano 
Published: April 2019

RESUMENLa primera parte del artículo cuestiona qué es la integración; las condiciones para que ésta se dé y si existe un solo tipo de integración. La segunda parte muestra la importancia que tiene la economía canadiense para el comercio exterior de México; dentro de las relaciones comerciales entre México y Canadá. La tercera parte considera el análisis del comercio de México con Estados Unidos. A partir del programa estadístico CAN se evalúa el comercio entre los tres países participantes.Palabras clave: CAN, comercio, integración, América del Norte. The importance of Mexico’s trade with the U.S. and Canada from CAN program.ABSTRACTThe first part of the paper asks which is the integration, what are the conditions under which it occurs, and if there is only a one type of integration. The second part shows importance of the Canadian economy in foreign trade Mexico, and in trade relations between Mexico and Canada. The third section reviews the trade between Mexico - United States. The fourth section evaluates the trade between the three economies through the CAN program.Keywords: CAN, trade, integration, North America.