Оптимизация параметров лазерного раскалывания силикатных стекол эллиптическими пучками в плоскости, параллельной поверхности

Regression and neural network models of the process of laser splitting of silicate glasses by elliptical beams in a plane parallel to the surface were obtained. To conduct a numerical experiment, a central compositional plan was used. The processing speed, laser beam power and its geometric parameters were selected as variable factors. As responses, the values of maximum temperatures and the values of maximum thermoelastic tensile stresses in the processing zone were determined, the calculation of which was performed using the APDL programming language. An effective architecture for an artificial neural network created using the TensorFlow program has been established. A comparative analysis of neural network and regression models was carried out. The influence of input parameters on responses was assessed. Using the MOGA algorithm of the ANSYS program, the optimal modes for the formation of laser-induced cracks by elliptical beams were determined, ensuring the effective implementation of parallel laser splitting of silicate glass.Получены регрессионные и нейросетевые модели процесса лазерного раскалывания силикатных стекол эллиптическими пучками в плоскости, параллельной поверхности. Для проведения численного эксперимента был использован центральный композиционный план. В качестве варьируемых факторов выбраны скорость обработки, мощность лазерного пучка и его геометрические параметры. В качестве откликов определялись значения максимальных температур и значения максимальных термоупругих напряжений растяжения в зоне обработки, расчет которых был выполнен с применением языка программирования APDL. Установлена эффективная архитектура искусственной нейронной сети, созданной с использованием программы TensorFlow. Проведен сравнительный анализ нейросетевых и регрессионных моделей. Выполнена оценка влияния входных параметров на отклики. С использованием алгоритма MOGA программы ANSYS определены оптимальные режимы формирования эллиптическими пучками лазерно-индуцированных трещин, обеспечивающие эффективную реализацию параллельного лазерного раскалывания силикатного стекла

Practical guidelines for standardising the measurement of resting metabolism by indirect calorimetry: a literature review

Accurate resting metabolic rate readings are essential for dietary planning and body composition monitoring not only for healthy individuals but also for athletes. A number of factors can alter resting metabolic rate during its measurement by indirect calorimetry. The methodology used may affect the results of the study. A clear standardisation of this procedure is needed to obtain the most accurate results.Purpose: To review the literature to determine the optimal subject condition and methodology for the resting metabolism measurement procedure using indirect calorimetry.Materials and methods: A literature search was conducted in PubMed, MEDLINE and Cochrane Library databases. The query included key words and logical phrases: “calorimetry”, “indirect calorimetry”, “resting metabolic rate”, “energy metabolism”, “basal metabolism”, “standards”. Only Englishlanguage studies and human studies were considered. Additional information was identified because of the review and included in the review.Results: the parameters of standardization during the resting metabolism measurement procedure are described: consumption of food, ethanol, caffeine, nicotine; daily activities and physical activity; body position in space and environmental conditions during the measurement; actions of the specialist performing the procedure, etc. The article outlines effective methods for measuring resting metabolism to obtain the most accurate results in both athletes and non-athletes.Conclusion: an attempt has been made to formulate precise methodological rules for standardization and recommendations for measuring resting metabolism by indirect calorimetry

Practical guidelines for standardising the measurement of resting metabolism by indirect calorimetry: a literature review

Accurate resting metabolic rate readings are essential for dietary planning and body composition monitoring not only for healthy individuals but also for athletes. A number of factors can alter resting metabolic rate during its measurement by indirect calorimetry. The methodology used may affect the results of the study. A clear standardisation of this procedure is needed to obtain the most accurate results.Purpose: To review the literature to determine the optimal subject condition and methodology for the resting metabolism measurement procedure using indirect calorimetry.Materials and methods: A literature search was conducted in PubMed, MEDLINE and Cochrane Library databases. The query included key words and logical phrases: “calorimetry”, “indirect calorimetry”, “resting metabolic rate”, “energy metabolism”, “basal metabolism”, “standards”. Only English-language studies and human studies were considered. Additional information was identified because of the review and included in the review.Results: the parameters of standardization during the resting metabolism measurement procedure are described: consumption of food, ethanol, caffeine, nicotine; daily activities and physical activity; body position in space and environmental conditions during the measurement; actions of the specialist performing the procedure, etc. The article outlines effective methods for measuring resting metabolism to obtain the most accurate results in both healthy individuals and athletes.Conclusion: an attempt has been made to formulate precise methodological rules for standardisation and recommendations for measuring resting metabolism by indirect calorimetry