Showing 20,041 - 20,060 results of 21,415 for search '"Mathematics"', query time: 0.09s Refine Results
  1. 20041

    Stagnation and renewable growth of enterprises: an empirical analysis by sectors of the Russian economy by V. V. Spitsin, V. A. Leonova, L. Yu. Spitsina, A. D. Bragin

    Published 2023-09-01
    “…The research methods are the calculation of economic coefficients and the identification of differences between them using methods of mathematical statistics. It was found that in an unfavorable external environment, significant proportion of Russian enterprises showed signs of stagnation or drop in sales. …”
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  2. 20042

    A modelling technique to determine the high frequency transformer leakage inductance using the winding structure by Yasir S. Dira, Ahmad Q. Ramli, Ungku Anisa Ungku Amirulddin, Nadia M. L. Tan

    Published 2025-01-01
    “…By not varying the average length of turns in the winding configuration, the proposed method was able to maintain a consistent copper loss. A modified mathematical model has been put forward to determine the leakage inductance effectively and precisely. …”
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  3. 20043

    A novel predictive model for estimation of cell voltage in electrochemical recovery of copper from brass: Application of gene expression programming by Ghasemi S., Vaghar S., Pourzafar M., Dehghani H., Heidarpour A.

    Published 2020-01-01
    “…The modeling results confirmed that the proposed model is a powerful tool in designing a mathematical equation between the parameters of electrochemical dissolution and the voltage induced by variation of these parameters.…”
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  4. 20044

    Direct Torque Control of Dual Three Phase Induction Motor fed by Direct Power Control Rectifier using Fuzzy Logic Speed Controller by Radhwane Sadouni, M’hamed Sahnoun, Ilyes Zababe, Hassen Reghioui

    Published 2025-01-01
    “…To tackle these challenges, we propose a fuzzy logic-based speed controller for DTC, which enhances adaptability to system dynamics without necessitating a precise mathematical model. The fuzzy logic controller (FLC) is particularly effective in regulating speed under varying load conditions, improving robustness, and minimizing torque ripple. …”
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  5. 20045

    Intelligent Beam-Hopping-Based Grant-Free Random Access in Secure IoT-Oriented Satellite Networks by Zhongliang Deng, Yicheng Liao

    Published 2025-01-01
    “…We assess the system’s performance through a thorough mathematical analysis. Furthermore, we ascertain the access delay and success rate to evaluate its capability to serve a substantial number of IoT devices under satellite–terrestrial delay and interference of massive connections. …”
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  6. 20046

    A Wet-Stock Management and Leak Detection System for Fuel Tanks by Ayşe Nur Dalman, Murat Oluş Özbek

    Published 2020-12-01
    “…This goal is achieved through obtaining the mathematical models for simple cylindrical tank that convert the measured liquid height to accurate liquid volume by taking into account the tank deformations. …”
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  7. 20047

    A New Asymmetric Fully Homomorphic Encryption Scheme for Cloud Banking Data by Zana Thalage Omar, Fadhil Salman Abed, Shaimaa Khamees Ahmed

    Published 2021-01-01
    “…Our current research provides a new algorithm for a publicly-keyed encryption system to keep bank data from tampering and theft when stored on the cloud computing platform, and our new system achieves fully Homomorphic Encryption, which allows mathematical operations to be performed on the encrypted text without the need for the original text. …”
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  8. 20048

    Diabetes Technology: Markers, Monitoring, Assessment, and Control of Blood Glucose Fluctuations in Diabetes by Boris P. Kovatchev

    Published 2012-01-01
    “…Diabetes technology has progressed remarkably over the past 50 years—a progress that includes the development of markers for diabetes control, sophisticated monitoring techniques, mathematical models, assessment procedures, and control algorithms. …”
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  9. 20049

    A Distributed Agents QoS Routing Algorithm to Transmit Electrical Power Measuring Information in Last Mile Access Wireless Sensor Networks by Ting Yang, Wenping Xiang, Linqi Ye

    Published 2013-11-01
    “…We also present the mathematical analysis to prove the algorithm's validity. …”
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  10. 20050

    Analysis and Design of the Project Risk Management System Based on the Fuzzy Clustering Algorithm by Ping Zhong, Hang Yin, Yuanfu Li

    Published 2022-01-01
    “…The system introduces the fuzzy clustering maximum tree algorithm, and by constructing a mathematical model, combined with the empirical analysis, the key risk factors in the cost risk of power grid construction projects are identified. …”
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  11. 20051

    Empathic Potential in Preschool Children with Mental Retardation by E.S. Ignatova, L.L. Ushakova, E.V. Kusheva

    Published 2024-05-01
    “…Gavrilova) and the Wexler’s test (children's version) were used. Mathematical processing methods include: χ2 (chi-squared) Pearson, Mann-Whitney U-test, cluster regression analysis. …”
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  12. 20052

    A novel optimal design approach for bladeless wind turbines considering mechanical properties of composite materials used by Zeinab Mohamed, Moataz Soliman, Mohamed Feteha, E. Saber

    Published 2025-01-01
    “…The study aims to maintain optimal performance without any decline that is observed in conventional bladeless wind turbines by controlling the turbine’s natural frequency through implementing these mechanisms, either by adjusting the effective length of the stand or by incorporating an additional mass in the hollow mast, or both. A mathematical model including dynamic analysis is constructed to adjust natural frequency to match the shedding frequency at the specified wind speed. …”
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  13. 20053

    Non-Additive Quantity Measurement Model by V. M. Romanchak, P. S. Serenkov

    Published 2022-10-01
    “…Stevens measurement model.A generalized structure was considered that included an empirical system, a mathematical system, and a homomorphism of the empirical system into a numerical system. …”
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  14. 20054

    Optimal allocation of intelligent parking lots in distribution system: A robust two‐stage optimization model by Motahareh Mojarad, Mostafa Sedighizadeh, Mohamad Dosaranian‐Moghadam

    Published 2022-06-01
    “…The aim of this paper is to optimally allocate IPLs in order to minimize system costs through a two‐stage mathematical model. The system cost involves installation cost, cost of exchanging the electrical power with an upstream grid, cost of the electrical power loss, network reliability cost, and emissions cost. …”
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  15. 20055

    Natura, architektura i zabawa jako źródła przeżyć estetycznych i odkryć geometrycznych dzieci – badania w działaniu by Barbara Bilewicz-Kuźnia, Małgorzata Centner-Guz

    Published 2015-12-01
    “…As a matter of fact, in the course of such activities the child not only experiences pleasure, but also discovers new phenomena, refines visual perception and aesthetic sensitivity, constructs mathematical concepts, enters the world of geometry. …”
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  16. 20056

    Design of Network and Pole for Meeting Lighting, Communication, and Energy Needs from a Single Source in Disasters by Levent Aksoy, İlknur Yardımcı Coşkun

    Published 2025-01-01
    “…In this study, following a systematic literature review, a multifunctional pole design was developed using engineering design methods, and the system's capacity and other parameters were evaluated through mathematical modeling. This hybrid pole provides a network structure offering integrated lighting, energy, and communication services during and after disasters. …”
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  17. 20057

    A Multi-Objective Stochastic Model for an Earthquake Relief Network by Zeren D. Yenice, Funda Samanlioglu

    Published 2020-01-01
    “…In this paper, a new stochastic multi-objective mixed integer mathematical model is developed and implemented in Kadikoy municipality of Istanbul, Turkey in order to configure part of the earthquake relief network. …”
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  18. 20058

    Capacity analysis for MISO-UWOC systems over GGD weak turbulence with zero boresight pointing error by Yueheng LI, Yining XU, Meiyan JU, Ping HUANG

    Published 2023-08-01
    “…Generalized Gamma distribution (GGD) was chosen to describe the weak oceanic turbulence, and a new hybrid fading channel model that integrated the GGD weak turbulence, the zero boresight pointing error, and the implicit path loss plus multipath propagation characterized by the fading free impulse response (FFIR) was proposed.Subsequently, mathematical expressions for the ergodic capacity and outage capacity of the multiple-input single-output underwater wireless optical communication (MISO-UWOC) systems were derived through the Meijer-G function under a selective transmission (ST) diversity scheme especially while inter-symbol interference (ISI) effects were considered or not.Finally, the correctness of the theoretical formulas derived above was verified by some numerical results.The simulation results show that with the introduction of the ST diversity, the ergodic capacity of the MISO-UWOC systems, taking the transmission ports N=2 as an example, is at least 1.3 times better than that of the conventional point-to-point (P2P) transmission under the same channel condition and system parameters, while the maximum outage capacity decreases is also more than 60% compared with the conventional P2P one.However, the introduction of the ISI will severely reduce this performance improvement.…”
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  19. 20059

    Specificity of overcoming behavior within relationship to tolerance to uncertainty of convicted men by A. A. Shylina, O. M. Skliarov

    Published 2018-12-01
    “…The t-criterion Student for independent groups and the Spearman correlation analysis were used for mathematical and statistical processing. It has been revealed that convicts who serve sentences not for the first time more often use strategies of distancing, self-control and responsibility. …”
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  20. 20060

    Review of Prediction Models for Chloride Ion Concentration in Concrete Structures by Jiwei Ma, Qiuwei Yang, Xinhao Wang, Xi Peng, Fengjiang Qin

    Published 2025-01-01
    “…When adequately trained with sufficient experimental data, these models generally offer superior prediction accuracy compared to mathematical models. The downside is that they necessitate a larger dataset for training, which can complicate their practical application. …”
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