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Journal articles on the topic 'Mathematical analysis. eng'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Fedorko, Gabriel, David Heinz, Vieroslav Molnár, and Tomáš Brenner. "Use of mathematical models and computer software for analysis of traffic noise." Open Engineering 10, no. 1 (2020): 129–39. http://dx.doi.org/10.1515/eng-2020-0021.

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AbstractNoise measurement and evaluation of the existing noise situation is carried out in the vicinity of selected roads to demonstrate the need for the design of anti-noise measures or to assess the effectiveness of the measures. The selection and number of measuring points, time and intervals, the road noise measurement procedure and the measuring instruments used shall be used in accordance with the provisions of the STN ISO 1996-1 and STN ISO 1996-2 standards. During the measurement, it is also necessary to determine the microclimatic conditions of measurement, such as temperature and rel

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Kalimoldayev, Maksat, Aleksey Drozdenko, Igor Koplyk, T. Marinich, Assel Abdildayeva, and Tamara Zhukabayeva. "Analysis of modern approaches for the prediction of electric energy consumption." Open Engineering 10, no. 1 (2020): 350–61. http://dx.doi.org/10.1515/eng-2020-0028.

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AbstarctA review of modern methods of forming a mathematical model of power systems and the development of an intelligent information system for monitoring electricity consumption. The main disadvantages and advantages of the existing modeling approaches , as well as their applicability to the energy systems of Ukraine and Kazakhstan,are identified. The main factors that affect the dynamics of energy consumption are identified. A list of the main tasks that need to be implemented in order to develop algorithms for predicting electricity demand for various objects, industries and levels has bee

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Borucka, Anna, Edward Kozłowski, Piotr Oleszczuk, and Andrzej Świderski. "Predictive analysis of the impact of the time of day on road accidents in Poland." Open Engineering 11, no. 1 (2020): 142–50. http://dx.doi.org/10.1515/eng-2021-0017.

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AbstractThe steady increase in the number of road users and their growing mobility mean that the issue of road safety is still a topical one. Analyses of factors influencing the number of road traffic accidents contribute to the improvement of road safety. Because changes in traffic volume follow a daily rhythm, hour of the day is an important factor affecting the number of crashes. The present article identifies selected mathematical models which can be used to describe the number of road traffic accidents as a function of the time of their occurrence during the day. The study of the seasonal

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Zumatov, S. S. "On a program manifold’s stability of one contour automatic control systems." Open Engineering 7, no. 1 (2017): 479–84. http://dx.doi.org/10.1515/eng-2017-0051.

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AbstractMethodology of analysis of stability is expounded to the one contour systems automatic control feedback in the presence of non-linearities. The methodology is based on the use of the simplest mathematical models of the nonlinear controllable systems. Stability of program manifolds of one contour automatic control systems is investigated. The sufficient conditions of program manifold’s absolute stability of one contour automatic control systems are obtained. The Hurwitz’s angle of absolute stability was determined. The sufficient conditions of program manifold’s absolute stability of co

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Elad, D., R. D. Kamm, and A. H. Shapiro. "Mathematical simulation of forced expiration." Journal of Applied Physiology 65, no. 1 (1988): 14–25. http://dx.doi.org/10.1152/jappl.1988.65.1.14.

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Flow limitation during forced expiration is simulated by a mathematical model. This model draws on the pressure-area law obtained in the accompanying paper, and the methods of analysis for one-dimensional flow in collapsible tubes developed by Shapiro (Trans. ASME J. Biomech. Eng. 99: 126-147, 1977). These methods represent an improvement over previous models in that 1) the effects of changing lung volume and of parenchymal-bronchial interdependence are simulated; 2) a more realistic representation of collapsed airways is employed; 3) a solution is obtained mouthward of the flow-limiting site

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Tiwari, D. C., P. L. Premlal, and Vandana Chaturvedi. "Surface polaritons in grating composed of left-handed materials." International Journal of Modern Physics B 32, no. 03 (2018): 1850028. http://dx.doi.org/10.1142/s0217979218500285.

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In this work, we developed a unique mathematical model to solve dispersion relation for surface polaritons (SPs) in artificial composite materials grating. Here, we have taken two types of materials for analysis. In the first case, the grating composed of epsilon-negative (ENG) material and air interface. In second case, grating composed of left-handed materials (LHMs) and ENG medium interface is considered. The dispersion curves of both p and s polarized SPs modes are obtained analytically. In the case of ENG grating and air interface, polaritons dispersion curves exist for p-polarization onl

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Žurovec, David, Jakub Hlosta, Jan Nečas, and Jiří Zegzulka. "Monitoring bulk material pressure on bottom of storage using DEM." Open Engineering 9, no. 1 (2019): 623–30. http://dx.doi.org/10.1515/eng-2019-0080.

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AbstractThis article focuses on the experimental verification of a mathematical derivation of Janssen’s theory, which describes the distribution of pressures within the bulk material and pressure distribution on the walls of storage facilities. The experimental verification is performed in two ways. The first is the real measurement of the load transfer in a bulk material cylinder and the second is similar to the detection of the load transfer through simulations using the DEM method. The aim is to compare the results of the theoretical calculation according to Janssen’s theory with the real m

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Bogdanova, O. G., O. A. Molchanova, I. Yu Tarmaeva, and N. V. Efimova. "Assessment and classification of food products as per health risks caused by chemical and microbiological contamination." Health Risk Analysis, no. 1 (March 2021): 57–67. http://dx.doi.org/10.21668/health.risk/2021.1.06.eng.

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Our research goal was to reveal priority food products (FP) distributed on a regional consumer market as per health risks they caused for population. The research was accomplished with statistic, analytical, and mathematical procedures as well as using comparative analysis procedure. We analyzed laboratory data on sanitary-chemical and physical-chemical parameters collected over 2010–2019; our analysis revealed there were insignificant risks excluding FP contamination with nitrates. Special attention should be paid to microbiological contamination as overall parameters related to it remain ste

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Maklakova, O. A., N. V. Zaitseva, and D. A. Kiryanov. "Methodical aspects in assessing risks of comorbid pathology occurrence under exposure to chemical environmental factors." Health Risk Analysis, no. 4 (December 2020): 54–61. http://dx.doi.org/10.21668/health.risk/2020.4.06.eng.

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Risk assessment methodology is a promising trend in examining effects produced by environmental factors on population health. However, at present little attention has been paid to issues related to comorbid pathologies occurrence under chronic exposure to toxicants. Our research goal was to improve methodic approaches to assessing risks of co-morbid pathology occurrence under exposure to multi-component chemical factors in the environment. Data and methods. To develop an algorithm for establishing a probability that comorbid pathology would occur, we analyzed scientific publications that focus

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Maklakova, O. A., N. V. Zaitseva, and D. A. Kiryanov. "Methodical aspects in assessing risks of comorbid pathology occurrence under exposure to chemical environmental factors." Health Risk Analysis, no. 4 (December 2020): 54–61. http://dx.doi.org/10.21668/health.risk/2020.4.06.eng.

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Risk assessment methodology is a promising trend in examining effects produced by environmental factors on population health. However, at present little attention has been paid to issues related to comorbid pathologies occurrence under chronic exposure to toxicants. Our research goal was to improve methodic approaches to assessing risks of co-morbid pathology occurrence under exposure to multi-component chemical factors in the environment. Data and methods. To develop an algorithm for establishing a probability that comorbid pathology would occur, we analyzed scientific publications that focus

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Sowiński, Adam, Tomasz Szczepański, and Grzegorz Koralewski. "Car braking effectiveness after adaptation for drivers with motor dysfunctions." Open Engineering 11, no. 1 (2021): 617–23. http://dx.doi.org/10.1515/eng-2021-0060.

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Abstract This article presents the results of measurements of the braking efficiency of vehicles adapted to be operated by drivers with motor dysfunctions. In such cars, the braking system is extended with an adaptive device that allows braking with the upper limb. This device applies pressure to the original brake in the car. The braking force and thus its efficiency depend on the mechanical ratio in the adapting device. In addition, braking performance depends on the sensitivity of the car’s original braking system and the maximum force that a disabled person can exert on the handbrake lever

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Antonopoulou, Dimitra, and Michael Plexousakis. "A posteriori analysis for space-time, discontinuous in time Galerkin approximations for parabolic equations in a variable domain." ESAIM: Mathematical Modelling and Numerical Analysis 53, no. 2 (2019): 523–49. http://dx.doi.org/10.1051/m2an/2018059.

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This paper presents an a posteriori error analysis for the discontinuous in time space–time scheme proposed by Jamet for the heat equation in multi-dimensional, non-cylindrical domains Jamet (SIAM J. Numer. Anal. 15 (1978) 913–928). Using a Clément-type interpolant, we prove abstract a posteriori error bounds for the numerical error. Furthermore, in the case of two-dimensional spatial domains we transform the problem into an equivalent one, of parabolic type, with space-time dependent coefficients but posed on a cylindrical domain. We formulate a discontinuous in time space–time scheme and pro

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Iglovsky, S. A., and V. V. Kriauciunas. "Anthrax cattle burials as a potential threat caused by changes in cryolite zones in the northern European part of Russia." Health Risk Analysis, no. 1 (March 2021): 108–14. http://dx.doi.org/10.21668/health.risk/2021.1.11.eng.

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Over recent years there have been registered anthrax cases among animals and people in Russia. Anthrax cattle burials remain a basic risk factor that causes epizootic deterioration. A lot of such burials do not correspond to sanitary-epidemiologic requirements especially those located in zones where long-term frozen rocks are now being developed in the northern European part of the country. Our research goal was to examine a situation with anthrax cattle burials in the chosen regions, especially bearing in mind climatic changes and changes in cryolite zones as well as to assess future prospect

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Zaitseva, N. V., S. V. Kleyn, D. A. Kiryanov, M. V. Glukhikh, and M. R. Kamaltdinov. "Emergence and variability of influence exerted by weather and climatic factors on life expectancy in the russian federation taking into account differentiation of rf regions as per socioeconomic and sanitary-epidemiologic determinants." Health Risk Analysis, no. 4 (December 2020): 62–75. http://dx.doi.org/10.21668/health.risk/2020.4.07.eng.

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The present research focuses on estimating influence exerted by weather and climatic factors on life expectancy (LE) in the Russian Federation taking into account socioeconomic and sanitary-epidemiologic determinants. To estimate influence exerted by this factor on LE, a mathematic model was applied; the model was based on neuron networks and allowed taking into account emergence and variability of influence exerted on changes in LE by a set of heterogeneous factors including weather and climatic ones. It was established that over 2010–2018 climate changed in most RF regions as there was a gro

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Zaitseva, N. V., S. V. Kleyn, D. A. Kiryanov, M. V. Glukhikh, and M. R. Kamaltdinov. "Emergence and variability of influence exerted by weather and climatic factors on life expectancy in the russian federation taking into account differentiation of rf regions as per socioeconomic and sanitary-epidemiologic determinants." Health Risk Analysis, no. 4 (December 2020): 62–75. http://dx.doi.org/10.21668/health.risk/2020.4.07.eng.

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The present research focuses on estimating influence exerted by weather and climatic factors on life expectancy (LE) in the Russian Federation taking into account socioeconomic and sanitary-epidemiologic determinants. To estimate influence exerted by this factor on LE, a mathematic model was applied; the model was based on neuron networks and allowed taking into account emergence and variability of influence exerted on changes in LE by a set of heterogeneous factors including weather and climatic ones. It was established that over 2010–2018 climate changed in most RF regions as there was a gro

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Abdalla, Mohamed, Muajebah Hidan, Salah Mahmoud Boulaaras, and Bahri-Belkacem Cherif. "Investigation of Extended k-Hypergeometric Functions and Associated Fractional Integrals." Mathematical Problems in Engineering 2021 (May 24, 2021): 1–11. http://dx.doi.org/10.1155/2021/9924265.

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Hypergeometric functions have many applications in various areas of mathematical analysis, probability theory, physics, and engineering. Very recently, Hidan et al. (Math. Probl. Eng., ID 5535962, 2021) introduced the (p, k)-extended hypergeometric functions and their various applications. In this line of research, we present an expansion of the k-Gauss hypergeometric functions and investigate its several properties, including, its convergence properties, derivative formulas, integral representations, contiguous function relations, differential equations, and fractional integral operators. Fur

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Popova, A. Yu, S. V. Kuzmin, N. V. Zaitseva, and I. V. May. "Priorities in scientific support provided for hygienic activities accomplished by a sanitary and epidemiologic service: how to face known threats and new chnallanges." Health Risk Analysis, no. 1 (March 2021): 4–14. http://dx.doi.org/10.21668/health.risk/2021.1.01.eng.

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Scientific support provided for activities accomplished by the Federal Service for Surveillance over Consumer Rights Protection and Human Well-being is considered to be a most significant tool for raising productivity and efficiency of the system functioning. A concept on scientific support provided for Rospotrebnadzor’s organs and authorities in 2021–2025 focuses on creating an integral, coordinated, efficient, stable, and adaptive system of scientific support provided for activities aimed at securing sanitary-epidemiologic welfare of the population. A peculiar feature of this concept for 202

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18

Hadj-Taı¨eb, E., and T. Lili. "Validation of Hyperbolic Model for Water-Hammer in Deformable Pipes." Journal of Fluids Engineering 122, no. 1 (1999): 57–64. http://dx.doi.org/10.1115/1.483227.

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A mathematical formulation is presented to describe the transient flow of homogeneous gas–liquid mixtures in deformable pipes. The mixture density is defined by an expression averaging the two-component densities where isothermal evolution of the gaseous phase is admitted. Instead of the void fraction, which varies with pressure, the gas–fluid mass ratio (or the quality), assumed to be constant, is used. By application of the conservation of mass and momentum laws, a nonlinear hyperbolic system of two differential equations is obtained for the two principal dependent variables, which are the f

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Mansoor, Wafaa, Graeme Hocking, and Duncan Farrow. "Modelling of hydrogen diffusion in the retina." ANZIAM Journal 61 (July 7, 2020): C119—C136. http://dx.doi.org/10.21914/anziamj.v61i0.14995.

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A simple mathematical model for diffusion of hydrogen within the retina has been developed. The model consists of three, well-mixed, one dimensional layers that exchange hydrogen via a diffusion process. A Fourier series method is applied to compute the hydrogen concentration. The effect of important parameters is examined and discussed. The results may contribute to an understanding of the hydrogen clearance technique to estimate blood flow. A two dimensional numerical method for the hydrogen diffusion is also presented. It is shown that the predominant features of the process are captured qu

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20

Junaedi, Iwan, Amin Suyitno, Endang Sugiharti, and Chin Kin Eng. "Disclosure Causes of Students Error in Resolving Discrete Mathematics Problems Based on NEA as A Means of Enhancing Creativity." International Journal of Education 7, no. 4 (2015): 31. http://dx.doi.org/10.5296/ije.v7i4.8462.

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<p>This article is based on research cooperation of Foreign Affairs in the first year, which was<br />carried out between the team of lecturers from the Department of Mathematics Education<br />Unnes (Indonesia) with Dr. Chin Kin Eng, a lecture of Mathematics Education from Universiti<br />Malaysia Sabah. The main objective of this research in the first year is to uncover the cause of<br />the students error in resolving Discrete Mathematics by Newman Errors Analysis (NEA). The<br />Results of this research will be used as the basis for the subsequent resear

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Liang, Hualou, Zhiyue Lin, and Fuliang Yin. "Removal of ECG contamination from diaphragmatic EMG by nonlinear filtering." Nonlinear Analysis: Theory, Methods & Applications 63, no. 5-7 (2005): 745–53. http://dx.doi.org/10.1016/j.na.2004.09.018.

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Zywietz, Chr, J. H. van Bemmel, and R. Degani. "Evaluation of ECG Interpretation Systems: Signal Analysis." Methods of Information in Medicine 29, no. 04 (1990): 298–307. http://dx.doi.org/10.1055/s-0038-1634795.

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AbstractPerformance analysis of biosignal processing systems which provide diagnostic statements requires particular care. Besides general accuracy requirements, psychological and legal implications for patient and physician have to be considered on both the development and the user sites. Cybernetics and control engineering have provided the basic methodology for performance analysis of systems: in technical systems often mathematically defined functions and signals can be fed into the system to be tested and its response and output provide the necessary performance characteristics after adeq

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Holzapfel, Gerhard A., and Ray W. Ogden. "Modelling the layer-specific three-dimensional residual stresses in arteries, with an application to the human aorta." Journal of The Royal Society Interface 7, no. 46 (2009): 787–99. http://dx.doi.org/10.1098/rsif.2009.0357.

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This paper provides the first analysis of the three-dimensional state of residual stress and stretch in an artery wall consisting of three layers (intima, media and adventitia), modelled as a circular cylindrical tube. The analysis is based on experimental results on human aortas with non-atherosclerotic intimal thickening documented in a recent paper by Holzapfel et al. ( Holzapfel et al. 2007 Ann. Biomed. Eng. 35 , 530–545 ( doi:10.1007/s10439-006-9252-z )). The intima is included in the analysis because it has significant thickness and load-bearing capacity, unlike in a young, healthy human

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Лузянина, Т., та T. Luzyanina. "Численный бифуркационный анализ математических моделей с запаздыванием по времени с использованием пакета программ DDE-BIFTOOL". Mathematical Biology and Bioinformatics 12, № 2 (2017): 496–520. http://dx.doi.org/10.17537/2017.12.496.

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Mathematical modeling with delay differential equations (DDEs) is widely used for analysis and making predictions in various areas of the life sciences, e.g., population dynamics, epidemiology, immunology, physiology, neural networks. The time delays in these models take into account a dependence of the present state of the modeled system on its past history. The delay can be related to the duration of certain hidden processes like the stages of the life cycle, the time between infection of a cell and the production of new viruses, the duration of the infectious period, the immune period and s

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Kostoglou, M. "Mathematical analysis of polymer degradation with chain-end scission." Chemical Engineering Science 55, no. 13 (2000): 2507–13. http://dx.doi.org/10.1016/s0009-2509(99)00471-6.

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DeLegge, Anthony, and Hannah Wangler. "Is this the end for Facebook? A mathematical analysis." Applied Mathematics and Computation 305 (July 2017): 364–80. http://dx.doi.org/10.1016/j.amc.2017.02.014.

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Tiwari, Sunil, Chandra K. Jaggi, and Shib Sankar Sana. "INTEGRATED SUPPLY CHAIN OF SUPPLIER AND RETAILER FOR STOCHASTIC DEMAND." Mathematical Modelling and Analysis 23, no. 4 (2018): 582–95. http://dx.doi.org/10.3846/mma.2018.035.

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This article deals with a two-stage supply chain comprising of the retailer and the supplier in which demand of the end customers follows news-vendor type demand. The setup costs, purchasing and procurement costs are dependent on lot sizes. The mathematical models for continuous and discrete variables of the chain are analyzed mathematically to maximize the expected average profits of individual and the collaborating systems. As our study suggests that collaborating system is always better than the decentralized system for known distribution cases, we also optimize the joint profit of the reta

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Zhao, Da Xu, Bai Chen, Guo Zhong Shou, and Yu Qi Gu. "Dynamic Analysis on a Cable-Driven Interventional Active Catheter Using Kane's Method Combined with Screw Theory." Applied Mechanics and Materials 527 (February 2014): 140–45. http://dx.doi.org/10.4028/www.scientific.net/amm.527.140.

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In view of the existing problems of traditional interventional catheters, particularly poor activity, operation difficulty and mass blind area, a novel interventional catheter with a cable-driven active head-end is proposed, and a prototype was built to verify the performance. This paper deals with the kinematics and dynamics of the cable-driven prototype, a dynamic model based on Kanes method combined with screw theory was presented in this paper. According the mathematical model and the prototypes structure, the analysis of kinematics and dynamics of active head-end-end is done in the enviro

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Macías-Díaz, Jorge E., Nauman Ahmed, and Muhammad Rafiq. "Analysis and Nonstandard Numerical Design of a Discrete Three-Dimensional Hepatitis B Epidemic Model." Mathematics 7, no. 12 (2019): 1157. http://dx.doi.org/10.3390/math7121157.

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In this work, we numerically investigate a three-dimensional nonlinear reaction-diffusion susceptible-infected-recovered hepatitis B epidemic model. To that end, the stability and bifurcation analyses of the mathematical model are rigorously discussed using the Routh–Hurwitz condition. Numerically, an efficient structure-preserving nonstandard finite-difference time-splitting method is proposed to approximate the solutions of the hepatitis B model. The dynamical consistency of the splitting method is verified mathematically and graphically. Moreover, we perform a mathematical study of the stab

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Ciarlet, Philippe G. "Mathematical modelling of linearly elastic shells." Acta Numerica 10 (May 2001): 103–214. http://dx.doi.org/10.1017/s0962492901000022.

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The objective of this article is to lay down the proper mathematical foundations of the two-dimensional theory of linearly elastic shells. To this end, it provides, without any recourse to any a priori assumptions of a geometrical or mechanical nature, a mathematical justification of two-dimensional linear shell theories, by means of asymptotic methods, with the thickness as the ‘small’ parameter.A major virtue of this approach is that it naturally leads to precise mathematical definitions of linearly elastic ‘membrane’ and ‘flexural’ shells. Another noteworthy feature is that it highlights in

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Georgieva-Tsaneva, G. "Application of Mathematical Methods for Analysis of Digital ECG Data." Information Technologies and Control 14, no. 2 (2016): 35–44. http://dx.doi.org/10.1515/itc-2017-0005.

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AbstractThis paper presents several mathematical methods for analysis of electrocardiogram digital data. The measurement of beat to beat fluctuations known as Heart Rate Variability becomes a non-invasive diagnostic technique to study the cardiac autonomic regulation. The analysis was done by software developed by the author. The article presents the results of linear methods, nonlinear methods and wavelet analysis of Heart Rate Variability data in healthy and diseased subjects. The obtained results and the performed comparative analysis demonstrate the possibility for effective application of

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SadAbadi, Hamid, Masood Ghasemi, and Ali Ghaffari. "A MATHEMATICAL ALGORITHM FOR ECG SIGNAL DENOISING USING WINDOW ANALYSIS." Biomedical Papers 151, no. 1 (2007): 73–78. http://dx.doi.org/10.5507/bp.2007.013.

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Port, Ethan, Fengzhu Sun, Daniela Martin, and Michael S. Waterman. "Genomic mapping by end-characterized random clones: a mathematical analysis." Genomics 26, no. 1 (1995): 84–100. http://dx.doi.org/10.1016/0888-7543(95)80086-2.

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Kummer, Frederick J. "Mathematical Analysis of First Metatarsal Osteotomies." Foot & Ankle 9, no. 6 (1989): 281–89. http://dx.doi.org/10.1177/107110078900900605.

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The mathematical analysis of most first metatarsal osteotomy corrections for metatarsus primus varus is presented and interpreted with respect to metatarsal lengthening or shortening and changes in clinical reference angles (e.g., intermetatarsal or angle of declination). The critical parameters for each osteotomy such as location and angles of cuts and amount of displacement are defined and their theoretical effects on the final correction determined. Although exactitude in surgical methodology and an absolute prediction of final clinical results are impossible at the present time, even guide

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Tyagi, Swati, Shaifu Gupta, Syed Abbas, Krishna Pada Das, and Baazaoui Riadh. "Analysis of infectious disease transmission and prediction through SEIQR epidemic model." Nonautonomous Dynamical Systems 8, no. 1 (2021): 75–86. http://dx.doi.org/10.1515/msds-2020-0126.

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Abstract In literature, various mathematical models have been developed to have a better insight into the transmission dynamics and control the spread of infectious diseases. Aiming to explore more about various aspects of infectious diseases, in this work, we propose conceptual mathematical model through a SEIQR (Susceptible-Exposed-Infected-Quarantined-Recovered) mathematical model and its control measurement. We establish the positivity and boundedness of the solutions. We also compute the basic reproduction number and investigate the stability of equilibria for its epidemiological relevanc

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ANTONTSEV, S. N., G. GAGNEUX, R. LUCE, and G. VALLET. "A NON-STANDARD FREE BOUNDARY PROBLEM ARISING FROM STRATIGRAPHY." Analysis and Applications 04, no. 03 (2006): 209–36. http://dx.doi.org/10.1142/s0219530506000759.

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In this paper, we are interested in the mathematical analysis of a geological stratigraphic model, taking into account a limited weathering condition. Firstly, we present the physical model and the mathematical formulation, which lead to an original locally hyperbolic conservation law. Then, after some heuristic simplifications, the definition of a solution and some mathematical tools in order to resolve the problem are given. Within the framework of sedimentation processes, we illustrate in the 1-D case the changing type of the equation: hyperbolic with finite speed propagation and parabolic

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Fialho, FB, MC Ledur, and VS Avila. "Mathematical Model to Compare Egg Production C." Revista Brasileira de Ciência Avícola 3, no. 3 (2001): 211–17. http://dx.doi.org/10.1590/s1516-635x2001000300002.

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A segmented polynomial model was used on several egg production curves in an attempt to analyze the differences between the curves in a more descriptive manner. Production curves from different commercial and experimental genetic lines of layers were used. The parameters of the model include the age and level of peak production, rate of decrease in production after the peak and time between start and peak of production. These and other derived variables were compared between the curves using contrasts. The methodology used allowed an easier interpretation of the curves, and the detection of di

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WERNER, ULRICH. "THEORETICAL VIBRATION ANALYSIS OF SOFT MOUNTED TWO-POLE INDUCTION MOTORS WITH STATIC ROTOR ECCENTRICITY." International Journal of Applied Mechanics 03, no. 01 (2011): 131–59. http://dx.doi.org/10.1142/s1758825111000919.

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The paper shows a mathematical model for vibration analysis of soft mounted two-pole induction motors regarding electromagnetic excitation due to static rotor eccentricity. A static rotor eccentricity causes an electromagnetic force, acting on the rotor and on the stator and oscillating with the double supply frequency. This magnetic force is implemented into a simplified analytical machine dynamic model and the correlations between the rotor dynamics, electromagnetic, oil film characteristics of the sleeve bearings, and the stiffness and damping of a soft foundation are mathematically describ

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Wei, Mengting, Qingyun Wang, Xiang Jiang, et al. "Directed Connectivity Analysis of the Brain Network in Mathematically Gifted Adolescents." Computational Intelligence and Neuroscience 2020 (August 28, 2020): 1–10. http://dx.doi.org/10.1155/2020/4209321.

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The neurocognitive characteristics of mathematically gifted adolescents are characterized by highly developed functional interactions between the right hemisphere and excellent cognitive control of the prefrontal cortex, enhanced frontoparietal cortex, and posterior parietal cortex. However, it is still unclear when and how these cortical interactions occur. In this paper, we used directional coherence analysis based on Granger causality to study the interactions between the frontal brain area and the posterior brain area in the mathematical frontoparietal network system during deductive reaso

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Guo, Binbin, Sanqin Zhao, Xibing Shao, Weimin Ding, Zhendan Shi, and Zhongliang Tang. "Analyses of mathematical models for Yangzhou geese egg-laying curves." Animal Reproduction Science 203 (April 2019): 10–24. http://dx.doi.org/10.1016/j.anireprosci.2019.02.003.

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Sakkalis, Vangelis, Michalis Zervakis, and Sifis Micheloyannis. "Significant EEG Features Involved in Mathematical Reasoning: Evidence from Wavelet Analysis." Brain Topography 19, no. 1-2 (2006): 53–60. http://dx.doi.org/10.1007/s10548-006-0012-z.

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Liu, Yu Chang, Zhi Peng Liu, Yan Jin, Zhong Qi Sheng, and Yong Xian Liu. "Study on Simulation Analysis of XXX Machine Cutting Chatter." Applied Mechanics and Materials 192 (July 2012): 73–77. http://dx.doi.org/10.4028/www.scientific.net/amm.192.73.

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According to regenerative chatter theory, this paper abstracts the machining process of XXX machine as a mathematical model firstly. The main process is end milling, so this paper abstracts the machine as an end-milling mathematical model, a delay motion equation with 2-DOF. All parameters of this equation can be acquired by modal analysis. Then SIMULINK model is created based on the mathematical model. According to the response characteristics of simulation analysis system, the method of determining threshold of steady area is acquired.

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Zolotariov, Denis. "THE PLATFORM FOR CREATION OF EVENT-DRIVEN APPLICATIONS BASED ON WOLFRAM MATHEMATICA AND APACHE KAFKA." Innovative Technologies and Scientific Solutions for Industries, no. 2 (16) (July 6, 2021): 12–18. http://dx.doi.org/10.30837/itssi.2021.16.012.

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The article is devoted to the study and development of the mechanism of interaction between Wolfram Mathematica programs and Apache Kafka queue to provide the ability to build event-driven applications based on it. The subject of the research is the practical principles of building a mechanism for interaction between Wolfram Mathematica and Apache Kafka through a proxy-server. The purpose of the article is to develop and substantiate practical recommendations regarding the formation of proxy-server and a mechanism for its work to publishing messages to the Apache Kafka queue and reading messag

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ZAGANESCU, Nicolae-Florin, Rodica ZAGANESCU, and Constantin-Marcian GHEORGHE. "Academician CAIUS IACOB – a Brilliant Mathematician Fascinated by Mechanics." INCAS BULLETIN 12, no. 1 (2020): 243–48. http://dx.doi.org/10.13111/2066-8201.2020.12.1.23.

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The paper presents some interesting aspects related to the biography and works of Romanian mathematician Caius Iacob (1912–1992). He was famous for his works in the fields of mathematical analysis, fluid mechanics, classical hydrodynamics and compressible-flow theory. At the age of 19, he graduated from the Mathematics Faculty in Bucharest, and then he went to Paris to continue his studies at the Faculty of Sciences, where he worked on a PhD thesis under the advice of famous French mathematician Henri Villat. On 24 June 1935, Caius Iacob successfully presented to the Sorbonne committee his PhD

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Sands, Timothy. "Derivative Analysis of Global Average Temperatures." Modern Applied Science 14, no. 2 (2020): 1. http://dx.doi.org/10.5539/mas.v14n2p1.

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Contemporary climate studies are quite numerous, and the topic in general has become politically charged, where opposing political interests have generated juxtaposed studies with contradictory results despite near unanimous acceptance of the fact the planet is warning.&nbsp; One emotionally charged issue is whether the increase is man-made or naturally occurring.&nbsp; This study avoids political pitfalls and controversial postulations, instead seeking to add to the literature a mathematical catastrophe analysis based on derivative modelling and extrapolation to deduce whether an unex

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Li, Shiwu, Mengzhu Guo, Linhong Wang, Meng Chai, Facheng Chen, and Yunong Wei. "Analysis on the Correlation Degree between the Driver’s Reaction Ability and Physiological Parameters." Mathematical Problems in Engineering 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/5215874.

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In this paper, the correlation degree between driver’s reaction time and the physiological signal is analyzed. For this purpose, a large number of road experiments are performed using the biopac and the reaction time test systems to collect data. First, the electroencephalograph (EEG) signal is processed by using the fast Fourier and the inverse Fourier transforms. Then, the power spectrum densities (PSD) ofα,β,δ, and EEG wave are calculated by Welch procedure. The average power of the power spectrum ofα,β, andθis calculated by the biopac software and two ratio formulas,(α+θ)/βandα/β, are sele

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Berezowski, Marek, and Marcin Lawnik. "Identification of fast-changing signals by means of adaptive chaotic transformations." Nonlinear Analysis: Modelling and Control 19, no. 2 (2014): 172–77. http://dx.doi.org/10.15388/na.2014.2.2.

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The adaptive approach of strongly non-linear fast-changing signals identification is discussed. The approach is devised by adaptive sampling based on chaotic mapping “in yourself” of a signal. Presented sampling way may be utilized online in the automatic control of chemical reactor (throughout identification of concentrations and temperature oscillations in real-time), in medicine (throughout identification of ECG and EEG signals in real-time), etc. In this paper, we presented it to identify the Weierstrass function and ECG signal.

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Yalcin, Ugur, and Can Altingoz. "The Uniform Scattered Fields from a Parabolic Surface with the Boundary Diffraction Wave Theory." Photonics Letters of Poland 9, no. 4 (2017): 125. http://dx.doi.org/10.4302/plp.v9i4.753.

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The uniform scattered fields of the cylindrical wave from a parabolic surface are obtained with the theory of the boundary diffraction wave (TBDW). The non-uniform diffracted field is calculated with the regenerated vector potential and rearranged by considering the Fresnel function to obtain the uniform solution. The uniform scattered fields are calculated as the sum of the diffracted and the geometrical optic fields. The numerical analyses of the diffracted and scattered fields in both uniform and non-uniform solutions are in harmony with the literature. Full Text: PDF ReferencesBaker, B. B.

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WALI, MOUSA K., M. MURUGAPPAN, and R. BADLISHAH AHMMAD. "MATHEMATICAL IMPLEMENTATION OF HYBRID FAST FOURIER TRANSFORM AND DISCRETE WAVELET TRANSFORM FOR DEVELOPING GRAPHICAL USER INTERFACE USING VISUAL BASIC FOR SIGNAL PROCESSING APPLICATIONS." Journal of Mechanics in Medicine and Biology 12, no. 05 (2012): 1240031. http://dx.doi.org/10.1142/s0219519412400313.

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In recent years, the application of discrete wavelet transform (DWT) on biosignal processing has made a significant impact on developing several applications. However, the existing user-friendly software based on graphical user interfaces (GUI) does not allow the freedom of saving the wavelet coefficients in .txt or .xls format and to analyze the frequency spectrum of wavelet coefficients at any desired wavelet decomposition level. This work describes the development of mathematical models for the implementation of DWT in a GUI environment. This proposed software based on GUI is developed unde

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Jekova, Irena, Peter Vassilev, Todor Stoyanov, and Tania Pencheva. "InterCriteria Analysis: Application for ECG Data Analysis." Mathematics 9, no. 8 (2021): 854. http://dx.doi.org/10.3390/math9080854.

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The InterCriteria Analysis (ICrA) is based on the mathematical formalisms of index matrices and intuitionistic fuzzy sets. It has been elaborated to discern possible similarities in the behavior of criteria pairs when multiple objects are considered, allowing also the accounting of information uncertainty. The focus of this study is to validate the applicability of ICrA over a large set of ECG criteria extracted for arrhythmia analysis and to evaluate its ability to support the pre-selection of criteria that could be further involved in decision making procedures. ICrA is applied over 88 ECG c

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