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Journal articles on the topic 'Impact – Mathematical models'

Author: Grafiati

Published: 4 June 2021

Last updated: 29 January 2023

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1

Zhuk, Tetyana. "Mathematical Models of Reinsurance." Mohyla Mathematical Journal 3 (January 29, 2021): 31–37. http://dx.doi.org/10.18523/2617-70803202031-37.

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Insurance provides financial security and protection of the independence of the insured person. Its principles are quite simple: insurance protects investments, life and property. You regularly pay a certain amount of money in exchange for a guarantee that in case of unforeseen circumstances (accident, illness, death, property damage) the insurance company will protect you in the form of financial compensation.Reinsurance, in turn, has a significant impact on ensuring the financial stability of the insurer. Because for each type of insurance there is a possibility of large and very large risks

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Vol’nikov, Mikhail, and Vladimir Vasilevich Smogunov. "MODELS OF ROADWAY DEGRADATION PROCESSES." Automation and modeling in design and management 2022, no. 2 (2022): 49–60. http://dx.doi.org/10.30987/2658-6436-2022-2-49-60.

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The issues of modelling the impact of influencing factors on the roadway degradation are considered. Constant external disturbances in the form of temperature, dynamic and other influences lead to the degradation of the heterostructures that make up the roadway. To clarify the causes and conditions under which the most intense roadway destruction occurs, theoretical and experimental studies are needed on physical and mathematical models that describe road heterostructures. The aim of the work is mathematical modelling of the impact of influencing factors on the roadway degradation. Mathematica

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Tedeschi, Luís Orlindo, Danny Gene Fox, Roberto Daniel Sainz, Luís Gustavo Barioni, Sérgio Raposo de Medeiros, and Celso Boin. "Mathematical models in ruminant nutrition." Scientia Agricola 62, no. 1 (2005): 76–91. http://dx.doi.org/10.1590/s0103-90162005000100015.

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Mathematical models can be used to improve performance, reduce cost of production, and reduce nutrient excretion by accounting for more of the variation in predicting requirements and feed utilization in each unique production situation. Mathematical models can be classified into five or more categories based on their nature and behavior. Determining the appropriate level of aggregation of equations is a major problem in formulating models. The most critical step is to describe the purpose of the model and then to determine the appropriate mix of empirical and mechanistic representations of ph

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Waniewski, Jacek. "Mathematical Models for Peritoneal Transport Characteristics." Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis 19, no. 2_suppl (1999): 193–201. http://dx.doi.org/10.1177/089686089901902s32.

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Four mathematical models and for the description of peritoneal transport of fluid solutes are reviewed. The membrane model is usually applied for (1) separation of transport components, (2) formulation of the relationship between flow components and their driving forces, and (3) estimation of transport parameters. The three-pore model provides correct relationships between various transport parameters and demonstrates that the peritoneal membrane should be considered heteroporous. The extended threepore model discriminates between heteroporous capillary wall and tissue layer, which are assumed

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Sonnergaard, J. M. "Impact of particle density and initial volume on mathematical compression models." European Journal of Pharmaceutical Sciences 11, no. 4 (2000): 307–15. http://dx.doi.org/10.1016/s0928-0987(00)00119-6.

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Pawlus, Witold, Hamid Reza Karimi, and Kjell Gunnar Robbersmyr. "Development of lumped-parameter mathematical models for a vehicle localized impact." Journal of Mechanical Science and Technology 25, no. 7 (2011): 1737–47. http://dx.doi.org/10.1007/s12206-011-0505-x.

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Martyniuk, Olesia, and Stepan Popina. "Mathematical models of unshadowing the wages." Herald of Ternopil National Economic University, no. 4(90) (December 12, 2018): 19–26. http://dx.doi.org/10.35774/visnyk2018.04.019.

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The article addresses a social and economic phenomenon of shadow economy, which is typical for many countries and may result in a macroeconomic imbalance. The latter hinders the sustainable growth of the economy and leads to state budget losses. Shadow economy is penetrating into almost all sectors of the national economy. As shown in the paper, a high level of shadow economy is a threat to the national economic security of the country and a cause of declining its competitiveness. The findings confirm that measuring the impact of some factors of shadow economy on the economic security of the c

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Zastempowski, Marcin, Andrzej Bochat, Lubomir Hujo, Juraj Jablonicky, and Maciej Janiec. "Impact of Cutting Units’ Design on Biomass Cutting Resistance." Acta Mechanica et Automatica 16, no. 3 (2022): 259–65. http://dx.doi.org/10.2478/ama-2022-0031.

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Abstract The paper presents mathematical models describing the moments of resistance to cutting on the cutting drum shafts in the biomass cutting process. The mathematical procedures described in the paper have been verified on a test stand developed and constructed by the authors, which reflects real conditions of the process of cutting plant material into pieces of specified lengths. Experimental verification proved that the developed mathematical models are adequate for drums of both cylindrical and conical constructions. The value of the average error did not exceed 13%. Following the math

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Sommariva, Sara, Giacomo Caviglia, Gianmario Sambuceti, and Michele Piana. "Mathematical Models for FDG Kinetics in Cancer: A Review." Metabolites 11, no. 8 (2021): 519. http://dx.doi.org/10.3390/metabo11080519.

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Compartmental analysis is the mathematical framework for the modelling of tracer kinetics in dynamical Positron Emission Tomography. This paper provides a review of how compartmental models are constructed and numerically optimized. Specific focus is given on the identifiability and sensitivity issues and on the impact of complex physiological conditions on the mathematical properties of the models.

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Chung, Chun Yen, Hung Yuan Chung, and Wen Tsai Sung. "Mathematical Models for the Dynamics Simulation of Tuberculosis." Applied Mechanics and Materials 418 (September 2013): 265–68. http://dx.doi.org/10.4028/www.scientific.net/amm.418.265.

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In recent years, following malaria, tuberculosis, AIDS, Novel Influenza, and other infectious diseases, have an enormous impact on the entire globe, and directly and profoundly awaken the public, making them cognitive and alert regarding emerging and re-emerging infectious diseases. For some countries or developing regions, tuberculosis is still very serious, however, the public is still unclear TB development and change a variety of factors, therefore, need a model theory of tuberculosis. In view of this, the global epidemic, scientists and statisticians hope to further develop a complete ins

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Hozé, Nathanaël, Sebastian Bonhoeffer, and Roland Regoes. "Assessing the public health impact of tolerance-based therapies with mathematical models." PLOS Computational Biology 14, no. 5 (2018): e1006119. http://dx.doi.org/10.1371/journal.pcbi.1006119.

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Rahmawati, Nurina Kurniasari, Arie Purwa Kusuma, Santi Widyawati, and Fredi Ganda Putra. "Google-Based Learning and Learning Motivation: The Impact and Interaction on Students’ Mathematical Communication." Tadris: Jurnal Keguruan dan Ilmu Tarbiyah 5, no. 2 (2020): 215–23. http://dx.doi.org/10.24042/tadris.v5i2.7163.

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Poor mathematical communication skills and motivation are influenced by several factors, such as the use of learning models used by teachers in learning. The use of appropriate learning models can improve students’ mathematical communication skills and motivation. This study aimed to determine the effect of the discussion learning model using Google Classroom and Google Form on students' mathematical communication in terms of students’ learning motivation. This type of research is quasi-experimental. Data were analyzed using two-way analysis of variance with unequal cells. Based on the results

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Mazzoccoli, Alessandro, and Maurizio Naldi. "An Overview of Security Breach Probability Models." Risks 10, no. 11 (2022): 220. http://dx.doi.org/10.3390/risks10110220.

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Cybersecurity breach probability functions describe how cybersecurity investments impact the actual vulnerability to cyberattacks through the probability of success of the attack. They essentially use mathematical models to make cyber-risk management choices. This paper provides an overview of the breach probability models that appear in the literature. For each of them, the form of the mathematical functions and their properties are described. The models exhibit a wide variety of functional relationships between breach probability and investments, including linear, concave, convex, and a mixt

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Hartati, Suci, Ratu Ayu Bilqis, and Achi Rinaldi. "Mathematical problem-solving abilities and reflective thinking abilities: The impact of the influence of eliciting activities models." Al-Jabar : Jurnal Pendidikan Matematika 11, no. 1 (2020): 167–78. http://dx.doi.org/10.24042/ajpm.v11i1.6709.

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This study aims to determine the effect of the Model Eliciting Activities (MEAs) learning model to the mathematical problem-solving abilities and the mathematical reflective thinking skills. This research is a type of Quasi Experimental Design research. Data collection techniques in this study in the form of documentation and tests at the public school in Bandar Lampung with 30 students of experiment classes and 30 students of control classes. Data analysis techniques used are the normality and homogeneity test. Testing hypothesis in this study using the Multivariate Analysis of Variance (MANO

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Munifah, Munifah, Windi Septiyani, Indah Tri Rahayu, Rahmi Ramadhani, and Hasan Said Tortop. "Analysis of Mathematical Problem Solving Capabilities : Impact of Improve and OSBORN Learning Models on Management Education." Desimal: Jurnal Matematika 3, no. 1 (2020): 17–26. http://dx.doi.org/10.24042/djm.v3i1.5335.

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Objectives The ability to solve problems is to gain knowledge and motivation in the problem solving process of students. The researcher used the IMPROVE and OSBORN learning models to improve problem solving skills. The IMPROVE and OSBORN learning models emphasize the development of optimal mathematical skills and generate new ideas in the process of problem solving. This research is used to see the impact of the IMPROVE learning model and OSBORN learning model which is better in mathematical problem solving abilities. This research uses the Quasy Experimental Design method. Hypothesis testing

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Bennett, J. C. "Assessment of the Impact of Land Use on Recreational Waters Using Mathematical Models." Water Science and Technology 21, no. 2 (1989): 223–28. http://dx.doi.org/10.2166/wst.1989.0054.

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Mathematical models were used to assist in quantifying the impact of changing land use on the recreational waters of Pumicestone Passage. Runoff, washoff, hydrodynamic and water quality models were firstly calibrated and then used to predict levels of dissolved oxygen, total nitrogen, total phosphorus and E.coli in the Passage for two future land development scenarios. The models provided valuable tools for understanding the system response to non-point source pollutant loadings and assessing alternative scenarios. They indicated that planned development to the year 2000 would not result in si

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Harris, Rebecca C., Tom Sumner, Gwenan M. Knight, and Richard G. White. "Systematic review of mathematical models exploring the epidemiological impact of future TB vaccines." Human Vaccines & Immunotherapeutics 12, no. 11 (2016): 2813–32. http://dx.doi.org/10.1080/21645515.2016.1205769.

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Yasin, Muhamad, Nasiroh Nasiroh, Abi Fadila, Sitti Hartinah, and Novalia Novalia. "Mathematical reasoning abilities: The Impact of Novick's Learning and Somatic, Auditory, Visual, Intellectual Learning Styles." Desimal: Jurnal Matematika 3, no. 1 (2020): 83–88. http://dx.doi.org/10.24042/djm.v3i1.4907.

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Every life needs a very important role especially the role in education. Improving the quality of education can be pursued by the use of appropriate learning models so as to improve students' reasoning abilities. The purpose of this study was to determine the differences in the influence of Novick's learning model and the learning model that is centered on educators on students' mathematical reasoning abilities, Knowing the interaction between learning models and SAVI learning styles (Somatic, Auditory, Visualization, Intelectually) on mathematical reasoning abilities learners. This research u

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Balandin, Dmitry V., Nikolai N. Bolotnik, Walter D. Pilkey, and Sergey V. Purtsezov. "Impact Isolation Limiting Performance Analysis for Three-Component Models." Journal of Dynamic Systems, Measurement, and Control 127, no. 3 (2004): 463–71. http://dx.doi.org/10.1115/1.1978914.

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For the crashworthiness analysis of transport vehicles a three-component system that consists of a base, a container, and an object to be protected, connected by shock isolators, can be utilized as a model. An approach for a limiting performance analysis of shock isolation for such a model is proposed. This approach involves the reduction of the optimal control problem for the three-component system to an auxiliary optimal control problem for a two-component system. A detailed description of the technique for the determination of the absolute minimum of the performance index and construction o

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Fanuel, Ibrahim M., Damian Kajunguri, and Francis Moyo. "Modelling the Impact of Human Population and Its Associated Pressure on Forest Biomass and Forest-Dependent Wildlife Population." Journal of Applied Mathematics 2023 (January 12, 2023): 1–9. http://dx.doi.org/10.1155/2023/4826313.

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Mathematical models have been widely used to explain the system originating from human-nature interaction, investigate the impacts of various components, and forecast system behaviour. This paper provides a profound reference to the current state of the art regarding the application of mathematical models to study the impact of human population and population pressure on forest biomass and forest-dependent wildlife. The review focused on two aspects, namely, model formulation and model analysis. In model formulation, the review revealed that socioeconomic status influences forest resource cons

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Komarudin, Komarudin, Suherman Suherman, and Anita Anggraini. "Analysis of Mathematical Concept Understanding Capabilities: The Impact of Makerspae STEM Learning Approach Models and Student Learning Activities." Journal of Innovation in Educational and Cultural Research 2, no. 1 (2021): 35–43. http://dx.doi.org/10.46843/jiecr.v2i1.21.

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This research aims to determine the influence of students' learning activities on the ability to understanding mathematical concepts through the STEM Learning Approach Makerspace model based on PBL on SPLDV materials. As for the type of research Quasi-Experiments. The population in this study was 90 students who were distributed into 3 classes with 2 classes that sampled grades VIII A and VIII C. The sampling techniques in this study used randomized classes and data collection techniques in this study were tests and observations, while the research instruments used preliminary tests and final

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Wang, Ning, Yuting Fu, Hu Zhang, and Huipeng Shi. "An evaluation of mathematical models for the outbreak of COVID-19." Precision Clinical Medicine 3, no. 2 (2020): 85–93. http://dx.doi.org/10.1093/pcmedi/pbaa016.

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Abstract Mathematical modelling performs a vital part in estimating and controlling the recent outbreak of coronavirus disease 2019 (COVID-19). In this epidemic, most countries impose severe intervention measures to contain the spread of COVID-19. The policymakers are forced to make difficult decisions to leverage between health and economic development. How and when to make clinical and public health decisions in an epidemic situation is a challenging question. The most appropriate solution is based on scientific evidence, which is mainly dependent on data and models. So one of the most criti

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Novokshonova, Elena, Marina Pivovarova, and Vladimir Tyurnin. "Impact of mathematical theory of exchange on national economic growth." MATEC Web of Conferences 239 (2018): 08020. http://dx.doi.org/10.1051/matecconf/201823908020.

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The paper presents the economic and mathematical theories of exchange by W.S. Jevons, L. Walras, J.E. Stiglitz, B. Holmström, and others. Theories of exchange are classified into classical (J.B. Say), neoclassical (A. Marshall), contractual (B. Holmström), natural scientific (V. Pareto), statistical. Mathematical models of exchange allow deepening the concept of competition. They show competition from the interaction of producers and the resulting uncertainty of exchange. It is shown that the emphasis on exchange to the detriment of production or, conversely, underestimation of exchange in eco

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Palomba, Ilaria, Alberto Doria, Edoardo Marconi, Matteo Bottin, and Giulio Rosati. "Vibration Energy Harvesting from Raindrops Impacts: Experimental Tests and Interpretative Models." Applied Sciences 12, no. 7 (2022): 3249. http://dx.doi.org/10.3390/app12073249.

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The kinetic energy of raindrops is a large and renewable source of energy that nowadays can be exploited by means of piezoelectric harvesters. This study focuses on a new cantilever harvester that uses the impact of a drop on a liquid surface created on the harvester in order to improve the conversion from kinetic energy to electric energy. Experimental tests, carried out both outdoors and indoors, were performed to assess the validity of the proposed design. The voltage obtained with the impact on the liquid surface was about four times larger than the one obtained with the impact on a dry su

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Čarný, Štefan, and Vladislav Zitrický. "Evaluation of the Impact of International Trade Using Regression and Correlation Models." Transport technic and technology 17, no. 1 (2021): 13–20. http://dx.doi.org/10.2478/ttt-2021-0003.

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Abstract The connection of international economies in the world represents an important role for the development of modern economies of countries. This phenomenon is known as globalization. The article describes in more detail the dependence of the Slovak Republic on the economies of East Asia, where mathematical research was performed on macroeconomic indicators of imports and exports. The Slovak Republic is experiencing an increase in GDP for the entire reference period. The growth of economic indicators in the Slovak Republic is ensured mainly due to the strong integration of our economy in

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Meena, Ayush, Tushar Sharma, Mohit Patodiya, and P. V. Ramana. "Evaluation of Morsel Rubber Mathematical Models in Seismic Areas." Proceedings of the 12th Structural Engineering Convention, SEC 2022: Themes 1-2 1, no. 1 (2022): 1185–91. http://dx.doi.org/10.38208/acp.v1.638.

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Reinforced concrete is the most consumed material in the world, followed by air and water. As the demand for reinforced concrete as a building material increases, so makes the demand for Portland cement and ordinary cement. On the other hand, environmental protection has become a significant issue due to climate change caused by global warming. This is due to emissions of greenhouse gases such as CO2 from human activities. Of all greenhouse gases, CO2 is responsible for approximately 65% ??of global warming. The cement industry also contributes to releasing CO2 into the atmosphere by producing

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Ben Dhahbi, Anis, Yassine Chargui, Salah Mahmoud Boulaaras, Sana Ben Khalifa, Waleed Koko, and Faisal Alresheedi. "Mathematical Modelling of the Sterile Insect Technique Using Different Release Strategies." Mathematical Problems in Engineering 2020 (November 6, 2020): 1–9. http://dx.doi.org/10.1155/2020/8896566.

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We study simple mathematical models for the dynamics of interactive wild and sterile insect populations. As well as being mathematically tractable, these models can be used as first approximations to real situations occurring with the Sterile Insect Technique (SIT) in which sterile males are released to reduce or eradicate a pest population. This is a method of biological control which can effectively help contain the spread of many pest insects such as the Red Palm Weevil (RPW). Models formulated in this paper are continuous-time, include a strong Allee effect that captures extinction events,

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Ishtiaq, Amna. "Dynamics of COVID-19 Transmission: Compartmental-based Mathematical Modeling." Life and Science 1, supplement (2020): 5. http://dx.doi.org/10.37185/lns.1.1.134.

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   The current pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-Cov2) demands scientists all over the world to make their possible contributions in whatever way possible to control this disease. In such health emergency, mathematical epidemiologists are playing a pivotal role by constructing different mathematical and statistical models for predicting different future scenario and their impact on different intervention strategies to policy makers and health legislators. Compartmental-based models (CBM), are a type

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Korzin, V. V., and P. P. Gladkih. "THEORETICAL AND EXPERIMENTAL INVESTIGATION OF DYNAMIC IMPACT OF AXISYMMETRIC JET BASED ON MATHEMATICAL MODELS." Scientific and Technical Volga region Bulletin 6, no. 1 (2016): 66–70. http://dx.doi.org/10.24153/2079-5920-2016-6-1-66-70.

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Myszograj, Sylwia, and Magdalena Wojciech. "Mathematical modelling of waste activated sludge thermal disintegration." ITM Web of Conferences 23 (2018): 00027. http://dx.doi.org/10.1051/itmconf/20182300027.

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Chemical Oxygen Demand (COD) solubilisation was used to evaluate the impact of thermal pretreatment on the transfer of sewage sludge from particulate to soluble phase. It was gathering the experimental data needed for building of empirical mathematical model describing the relation between applied temperature and time and rate of COD solubilisation and degradation. In view of repeated measurements, in order to describe the relationship between changes in the fraction of dissolved COD and the time and temperature, mixed models have been adopted where by fixed factor measurement conditions have

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Manevitch, L. I., and O. V. Gendelman. "Oscillatory models of vibro-impact type for essentially non-linear systems." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 10 (2008): 2007–43. http://dx.doi.org/10.1243/09544062jmes1057.

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This paper reviews recent developments related to oscillatory systems, their impact on and relationship to the cases of smooth, essentially anharmonic (non-linearizable) potentials, and vice versa. Special methods of treatment that allow the response regimes in dynamic vibro-impact systems to be computed have been discussed. Mathematical models that approximate purely elastic as well as inelastic impact, with the help of smooth functions, are presented and illustrated by specific examples. The use of ideas based on non-smooth time transforms to treat essentially non-linear systems with smooth

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Salingkat, Suhartini, and Anastasia Bilalu. "THE INFLUENCE OF TREFFINGER LEARNING MODELS ON MATHEMATICS COMMUNICATION SKILLS OF STUDENTS." Jurnal Pendidikan Matematika dan IPA 12, no. 2 (2021): 97. http://dx.doi.org/10.26418/jpmipa.v12i2.40814.

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This study aims to analyze the impact of the Treffinger learning model on students' mathematical communication skills. This research was conducted at Senior High School 1 Bulagi grade 10th, 2018/2019 academic year. This type of research was a Quasi-Experimental study with a Pretest-Posttest Control Group Design. Data collection on mathematical communication skills used test instruments. The results revealed that the mathematical communication skills of students taught using the Treffinger learning model were higher than those taught using the Student Team Achievement Division / STAD cooperativ

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Koelle, Katia, and David A. Rasmussen. "Rates of coalescence for common epidemiological models at equilibrium." Journal of The Royal Society Interface 9, no. 70 (2011): 997–1007. http://dx.doi.org/10.1098/rsif.2011.0495.

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Coalescent theory provides a mathematical framework for quantitatively interpreting gene genealogies. With the increased availability of molecular sequence data, disease ecologists now regularly apply this body of theory to viral phylogenies, most commonly in attempts to reconstruct demographic histories of infected individuals and to estimate parameters such as the basic reproduction number. However, with few exceptions, the mathematical expressions at the core of coalescent theory have not been explicitly linked to the structure of epidemiological models, which are commonly used to mathemati

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Nguyen, Ngoc Hung, Van Phan Do, and Hoa Tien Vu. "Estimating Disturbance Torque Effects on the Stability and Control Performance of Two-Axis Gimbal Systems." Journal of the Russian Universities. Radioelectronics 25, no. 4 (2022): 63–71. http://dx.doi.org/10.32603/1993-8985-2022-25-4-63-71.

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Introduction. Two-axis gimbal systems are applied for stabilizing and controlling the line of sight (LOS) of an optical or imaging system mounted on a moving vehicle. Gimbal systems are intended to isolate various disturbance torques and control the LOS toward the direction of a target. Two-axis gimbals can be of two main types, namely Yaw-Pitch and Swing-Roll type. In this article, we focus on investigating mathematical models of two-axis gimbals, which describe the impact of cross-disturbance torques on their stability and control performance. Simulations were conducted to compare advantages

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Rosello, Alicia, Carolyne Horner, Susan Hopkins, Andrew C. Hayward, and Sarah R. Deeny. "Understanding the Impact of Interventions to Prevent Antimicrobial Resistant Infections in the Long-Term Care Facility: A Review and Practical Guide to Mathematical Modeling." Infection Control & Hospital Epidemiology 38, no. 2 (2016): 216–25. http://dx.doi.org/10.1017/ice.2016.286.

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OBJECTIVES(1) To systematically search for all dynamic mathematical models of infectious disease transmission in long-term care facilities (LTCFs); (2) to critically evaluate models of interventions against antimicrobial resistance (AMR) in this setting; and (3) to develop a checklist for hospital epidemiologists and policy makers by which to distinguish good quality models of AMR in LTCFs.METHODSThe CINAHL, EMBASE, Global Health, MEDLINE, and Scopus databases were systematically searched for studies of dynamic mathematical models set in LTCFs. Models of interventions targeting methicillin-res

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Bulgakov, Volodymyr, Semjons Ivanovs, Volodymyr Volskyi, Volodymyr Kuvachоv, and Yevhen Ihnatiev. "Simulation of the Flat-parallel Movement of a Bridge Agricultural Unit with an Articulated Frame." Rural Sustainability Research 44, no. 339 (2020): 8–14. http://dx.doi.org/10.2478/plua-2020-0012.

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AbstractThe work presents foundations of the dynamics of the flat-parallel movement of a bridge agricultural unit in a horizontal with the kinematic method of its control (turning the wheels) by changing the position of one of its parts relative to the other. The analysis of assessment of the degree of impact of the scheme and parameters of the investigated agricultural tool upon its controllability and stability of movement is based on the amplitude and phase frequency characteristics. The mathematical models of the movement of the bridge agricultural unit are presented in a differential and

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Serov, A. S., C. Salafia, D. S. Grebenkov, and M. Filoche. "The role of morphology in mathematical models of placental gas exchange." Journal of Applied Physiology 120, no. 1 (2016): 17–28. http://dx.doi.org/10.1152/japplphysiol.00543.2015.

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The performance of the placenta as a gas exchanger has a direct impact on the future health of the newborn. To provide accurate estimates of respiratory gas exchange rates, placenta models need to account for both the physiology of exchange and the organ morphology. While the former has been extensively studied, accounting for the latter is still a challenge. The geometrical complexity of placental structure requires use of carefully crafted approximations. We present here the state of the art of respiratory gas exchange placenta modeling and demonstrate the influence of the morphology descrip

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Pollard, P. C., E. v. Münch, P. A. Lant, and P. F. Greenfield. "The impact of microbiological tools on mathematical modelling of biological wastewater treatment." Water Science and Technology 36, no. 10 (1997): 97–108. http://dx.doi.org/10.2166/wst.1997.0368.

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Biological systems are being used to treat an increasing range of complex wastes; domestic and industrial wastewaters containing nutrients and refractory organic compounds, soil sites and groundwater contaminated by organics, and organic solid residues. These treatment processes rely on micro-organisms and, more than ever before, must deliver higher quality outcomes at higher levels of reliability to protect the environment. At the same time, pressures to deliver cost-effective treatment have increased. The challenge for these biological treatment technologies and the associated engineering is

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Vilenskiy, O., S. Dushev, D. Lapshin, and Ya Lebedeva. "COMPUTATIONAL ANALYSIS OF THE IMPACT ACTION IN THE DESIGN OF THE TOOLING FOR EQUIPMENT TESTING." PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS 2019, no. 3 (2019): 14–29. http://dx.doi.org/10.55176/2414-1038-2019-3-14-29.

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Described are state-of-the-art approaches to solving the problems associated with impact testing of the equipment under development at the design stage. A brief description is provided of an experimental facility that models in different directions the impact loads equivalent to the effect of a blast wave originated near the object. The topicality is emphasized of developing - based upon the calculational mathematical analysis - the safe process tooling that prevents any possibility of accident consequences. The capabilities of ANSYS/LS-DYNA, a state-of-the-art computing system, are elucidated

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Barquero, Berta, and Britta Eyrich Jessen. "Impact of theoretical perspectives on the design of mathematical modelling tasks." Avances de Investigación en Educación Matemática, no. 17 (May 1, 2020): 98–113. http://dx.doi.org/10.35763/aiem.v0i17.317.

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In this paper, we discuss how the adoption of a particular theoretical framework affects task design in the research field of modelling and applications. With this purpose, we start by referring to the existence of different reference epistemological models about mathematical modelling to analyse better the consequences they have for decision making concerning designing modelling tasks and their implementation. In particular, we present the analysis of three case studies, which have been selected as representatives of different theoretical perspectives to modelling. We discuss the impact of th

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Cárdenas Gutiérrez, Javier Alfonso, Jose Leonardo Jacome Carrascal, and Mawency Vergel Ortega. "Determination of potential and actual evapotranspiration in watershed, using mathematical models." Revista Boletín Redipe 10, no. 3 (2021): 225–31. http://dx.doi.org/10.36260/rbr.v10i3.1230.

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In this research, it is analyzed the calculation of real evapotranspiration in hydrographic basins, it is taken as a reference the Aguablanca Creek, located in the municipality of Bochalema, North of Santander-Colombia, where it is evaluated the hydrologic balance of this basin from the determination of detailed calculations of four mathematical models, to later evaluate the hydrologic balance of this basin, with the purpose of being able to make a better administration of these resources, as well as the use of the soil, betting on the development of an ecologically sustainable society with lo

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He, Bin, and Jun Long Lu. "Stress Analysis of Underground Arch Structure." Advanced Materials Research 243-249 (May 2011): 938–41. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.938.

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To research the safety of an underground defense project and the impact to other buildings, applying basic mechanics principles, established two types of mathematical model for arch about the project, and analyzed stress in different directions of ground arch structure. The data shows that the results were very different in different mathematical models, and mathematical models should be considered as close to actual stress situation in structural analysis. In the structural analysis involved soil, spatial finite element model is more accurate and reasonable than truss finite element model.

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Wang, Chang Sheng, Hai Xiong Wang, Ji Bin Li, and Jiang Zhang. "Experiment on Hot Rolling Deformation Resistance of Aluminum Alloy and Mathematical Modeling." Advanced Materials Research 314-316 (August 2011): 409–14. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.409.

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In order to investigate the impact factor of hot rolled aluminum alloy, a experiment was finished in a factory, to determine the effects of hot-rolled aluminum alloy plate with the system deformation resistance coefficient of the various factors and to mark the influence about the temperature to the hot rolling deformation resistance; Then, established the mathematical models of 1100,3003,5052 series hot rolled aluminum alloy plate's deformation resistance; The data calculated by the theoretical mathematical models is in good agreement the measured data. So this mathematical have the importanc

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Islamiati, Nur, Dina Amalya Lapele, and Beatrix Purnama Sari. "Mathematical Problem Solving Ability in terms of Mathematical Disposition on the Application of Group Investigation (GI) Learning Models." Edumatica : Jurnal Pendidikan Matematika 11, no. 02 (2021): 29–37. http://dx.doi.org/10.22437/edumatica.v11i02.12205.

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This study aims to describe how students 'problem-solving abilities in terms of students' mathematical dispositions on the application of the group investigation (GI) learning model. The approach used is qualitative and quantitative with descriptive types. The research subjects were 29 MAN 1 Malang class X. The data collection technique used a closed questionnaire type Likert scale, observation sheet and test questions. The results showed that learning using the group investigation learning model on mathematics learning could have a positive impact on the affective domain of students, namely m

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Abiodun, Oluwakemi E., Olukayode Adebimpe, James A. Ndako, Olajumoke Oludoun, Benedicta Aladeitan, and Michael Adeniyi. "Mathematical modeling of HIV-HCV co-infection model: Impact of parameters on reproduction number." F1000Research 11 (October 10, 2022): 1153. http://dx.doi.org/10.12688/f1000research.124555.1.

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Background: Hepatitis C Virus (HCV) and Human Immunodeficiency Virus (HIV) are both as classified blood-borne viruses since they are transmitted through contact with contaminated blood. Approximately 1.3 million of the 2.75 million global HIV/HCV carriers inject drugs (PWID). HIV co-infection has a harmful effect on the progression of HCV, resulting in greater rates of HCV persistence after acute infection, higher viral levels, and accelerated progression of liver fibrosis and end-stage liver disease. In this study, we developed and investigated a mathematical model for the dynamical behavior

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Thomas, R. W. "Developments in Mathematical Programming Models and Their Impact on the Spatial Allocation of Educational Resources." Progress in Human Geography 11, no. 2 (1987): 207–26. http://dx.doi.org/10.1177/030913258701100203.

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Davis, Emma L., Leon Danon, Joaquín M. Prada, et al. "Seasonally timed treatment programs for Ascaris lumbricoides to increase impact—An investigation using mathematical models." PLOS Neglected Tropical Diseases 12, no. 1 (2018): e0006195. http://dx.doi.org/10.1371/journal.pntd.0006195.

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Graczykowski, C. "Mathematical models and numerical methods for the simulation of adaptive inflatable structures for impact absorption." Computers & Structures 174 (October 2016): 3–20. http://dx.doi.org/10.1016/j.compstruc.2015.06.017.

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Shnaidman, V. M., and R. Sh Zhemukhov. "Environmental Aspects in Mathematical Modeling of Irrigation Systems Planning." Water Science and Technology 26, no. 5-6 (1992): 1439–47. http://dx.doi.org/10.2166/wst.1992.0587.

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This paper deals with applying computer-oriented technology while selecting water and land resources management strategies lor irrigation systems with special reference to environmental aspects. The technology is based on a system of coordinated mathematical models. The system includes a simulation model of irrigation system functioning, a model for irrigation water demand computation, a set of simplified mathematical models of the anthropogenic impact, viz. soil salinization, non-point pollutions from agricultural plots, rising level of subsurface water and its mineralization. The system also

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Haq, Ihtisham Ul, Nigar Ali, and Shabir Ahmad. "A fractional mathematical model for COVID-19 outbreak transmission dynamics with the impact of isolation and social distancing." Mathematical Modelling and Control 2, no. 4 (2022): 228–42. http://dx.doi.org/10.3934/mmc.2022022.

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<abstract><p>The Covid illness (COVID-19), which has emerged, is a highly infectious viral disease. This disease led to thousands of infected cases worldwide. Several mathematical compartmental models have been examined recently in order to better understand the Covid disease. The majority of these models rely on integer-order derivatives, which are incapable of capturing the fading memory and crossover behaviour observed in many biological phenomena. Similarly, the Covid disease is investigated in this paper by exploring the elements of COVID-19 pathogens using the non-integer Ata

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