MAGIC is one of the most widely used models for forecasting long-term acidification. The model's code, however, has been experiencing numerical instability, though this might not be widely known to the public user...MAGIC is one of the most widely used models for forecasting long-term acidification. The model's code, however, has been experiencing numerical instability, though this might not be widely known to the public users. The major instability comes from the analytical solution to two cubic equations for calculating SO42- concentration and the exchangeable fraction of Al on the soils. The mathematical algorithm for calculating the concentration of SO42- from a quadratic equation is also found instable. This paper is aimed at improving the instability above through proved numerical algorithms.展开更多
Various methods of tyre modelling are implemented from pure theoretical to empirical or semi-empirical models based on experimental results. A new way of representing tyre data obtained from measurements is presented ...Various methods of tyre modelling are implemented from pure theoretical to empirical or semi-empirical models based on experimental results. A new way of representing tyre data obtained from measurements is presented via support vector machines （SVMs）. The feasibility of applying SVMs to steady-state tyre modelling is investigated by comparison with three-layer backpropagation （BP） neural network at pure slip and combined slip. The results indicate SVMs outperform the BP neural network in modelling the tyre characteristics with better generalization performance. The SVMsqyre is implemented in 8-DOF vehicle model for vehicle dynamics simulation by means of the PAC 2002 Magic Formula as reference. The SVMs-tyre can be a competitive and accurate method to model a tyre for vehicle dynamics simuLation.展开更多
While experimenting with the more and more popular neodymium magnetic ball sets, the author developed a method, by which models of atomic nuclei can be created. These macroscopic models visually represent several feat...While experimenting with the more and more popular neodymium magnetic ball sets, the author developed a method, by which models of atomic nuclei can be created. These macroscopic models visually represent several features of nuclei and nuclear phenomena, which can be a useful mean during the teaching of nuclear physics. Even though such macroscopic models are unable to depict the true quantum physical nature of nuclear processes, they can be much more useful didactically than the previously used disordered sets of balls, to represent the atomic nucleus.展开更多
人工智能(AI)正在重塑教育领域,其中AI辅助教学成为提升教学效率和质量的关键途径。魔力学校(Magic School AI)作为美国教育改革的先锋,通过生成式AI技术,为教育工作者和学习者提供了创新的教学和学习体验。该平台基于建构主义学习理论...人工智能(AI)正在重塑教育领域,其中AI辅助教学成为提升教学效率和质量的关键途径。魔力学校(Magic School AI)作为美国教育改革的先锋,通过生成式AI技术,为教育工作者和学习者提供了创新的教学和学习体验。该平台基于建构主义学习理论、通用学习设计理念和知识深度模型,设计了多样化的教学工具,其优势主要体现在个性化学习、适应不同学习环境和促进有效沟通与协作方面。然而,随着AI教学工具的广泛应用,数据隐私、技术偏见和用户接受度等问题也日益凸显,需要在推广过程中予以解决。魔力学校AI平台的成功经验,对于人工智能与应用技术的研究和实践具有重要参考价值,为全球教育工作者和政策制定者提供了AI辅助教学的宝贵经验和启示,促进了对教育技术未来发展的深入思考。展开更多
文摘MAGIC is one of the most widely used models for forecasting long-term acidification. The model's code, however, has been experiencing numerical instability, though this might not be widely known to the public users. The major instability comes from the analytical solution to two cubic equations for calculating SO42- concentration and the exchangeable fraction of Al on the soils. The mathematical algorithm for calculating the concentration of SO42- from a quadratic equation is also found instable. This paper is aimed at improving the instability above through proved numerical algorithms.
基金This project is supported by Shanghai Automobile Industry Corporation Technology Foundation, China(No.0224).
文摘Various methods of tyre modelling are implemented from pure theoretical to empirical or semi-empirical models based on experimental results. A new way of representing tyre data obtained from measurements is presented via support vector machines （SVMs）. The feasibility of applying SVMs to steady-state tyre modelling is investigated by comparison with three-layer backpropagation （BP） neural network at pure slip and combined slip. The results indicate SVMs outperform the BP neural network in modelling the tyre characteristics with better generalization performance. The SVMsqyre is implemented in 8-DOF vehicle model for vehicle dynamics simulation by means of the PAC 2002 Magic Formula as reference. The SVMs-tyre can be a competitive and accurate method to model a tyre for vehicle dynamics simuLation.
文摘While experimenting with the more and more popular neodymium magnetic ball sets, the author developed a method, by which models of atomic nuclei can be created. These macroscopic models visually represent several features of nuclei and nuclear phenomena, which can be a useful mean during the teaching of nuclear physics. Even though such macroscopic models are unable to depict the true quantum physical nature of nuclear processes, they can be much more useful didactically than the previously used disordered sets of balls, to represent the atomic nucleus.
文摘人工智能(AI)正在重塑教育领域,其中AI辅助教学成为提升教学效率和质量的关键途径。魔力学校(Magic School AI)作为美国教育改革的先锋,通过生成式AI技术,为教育工作者和学习者提供了创新的教学和学习体验。该平台基于建构主义学习理论、通用学习设计理念和知识深度模型,设计了多样化的教学工具,其优势主要体现在个性化学习、适应不同学习环境和促进有效沟通与协作方面。然而,随着AI教学工具的广泛应用,数据隐私、技术偏见和用户接受度等问题也日益凸显,需要在推广过程中予以解决。魔力学校AI平台的成功经验,对于人工智能与应用技术的研究和实践具有重要参考价值,为全球教育工作者和政策制定者提供了AI辅助教学的宝贵经验和启示,促进了对教育技术未来发展的深入思考。
