基于PBL教学法,融合"自主学习、合作学习"的理念,根据布鲁姆的认知学习目标分类和"学习金字塔"理论,针对东南大学成贤学院学生制定了"参与式"物理实验课程教学模式."参与式"教学模式即学生参与讲课、参与讨论、参与评价,这种教学模式不但能有效解决教学中存在的痛点问题,还有助于提升学生的学习效率,激发学生的学习兴趣,培养学生的主动学习和合作学习能力,符合新工科背景下对新型工科人才的培养要求.
High quality-factor, low-loss and high-transmission electromagnetically induced transparency is one of the important research directions of metamaterials. In this paper, a cross-shaped all-dielectric metamaterial structure is designed, which is composed of two mutually orthogonal silicon empty cavities. When the cross-shaped structure is fully symmetrical, there is no electromagnetically induced transparency. However, when the symmetry of the structure is broken in a specific direction, the dark mode is introduced and the electromagnetically induced transparency can be observed. The transmission peaks with 93% transmissivity and 1064 quality factor can be realized simultaneously. The physical mechanism of the electromagnetically induced transparency is analyzed using the electromagnetic resonance modes, the influences of asymmetric offsets under different directions, geometric structrue and refractive index on the transmission spectrum are further investigated, and the high group refractive index phenomenon at transmission peaks is analyzed using phase change. These characteristics make the proposed metamaterial structure possible to be applied in slow-light devices, sensors and optical switches.
随着信息技术的高速发展,微课进入了高校教学课堂,是传统课堂学习的一种重要补充和拓展资源.问题驱动的教学模式遵循了建构主义教育理论,利用学生对知识的好奇心和疑问作为教学的内在驱动力,以问题为载体有效地组织学生学习,在解决问题的学习过程中,建构完善认知结构的自我导向式学习.本文基于微课理念,以问题的引入、解决、回应和总结来规划设计完整的教学活动,结合笔者近几年的线下、线上教学实践和经验,就如何基于微课在大学物理教学中以问题驱动的教学进行了探索与实践.
随着信息技术的高速发展,微课逐渐步入了高校教学课堂,颠覆了课堂内外的学习时间和空间,是传统课堂学习的一种重要补充和拓展资源.混合式教学模式是现代信息化网络学习和传统的课堂教学相结合的教学模式,结合了二者的优势,在充分激发和调动学生学习的主动性、积极性与创造性的同时,教师则成为学习活动的引导者、指导者和对话者,提高课堂教学时间的使用效率.本文基于微课理念,结合笔者近几年的混合教学实践和经验,就如何利用混合式教学提高独立学院大学物理课程的教学效果进行了探索与实践.
随着信息技术的快速发展,微课进入了高校教学课堂,成为传统课堂学习的一种重要补充。SPOC教学模式是现代信息化网络学习和传统课堂教学相结合的一种教学模式,结合了二者的优势,以学生为中心,以教师为主导,有利于提高课堂教学时间的使用效率。在素质教育背景下,衡量教与学成效的过程化考核策略研究严重滞后,已经制约了教学质量的进一步提高。本文基于微课理念,结合笔者近几年的线下、线上SPOC教学实践和经验,就如何在大学物理SPOC教学中引入过程化考核,提高大学物理课程的教学效果进行了探索与实践。
The authors demonstrate the all-dielectric-metamaterials-based electromagnetically induced transparency with low loss and high quality (Q) factor. The all-dielectric metamaterial is made up of bi-layer silicon bars. A transparency window is observed by the coupled the bright and dark modes when the asymmetry is introduced. Compared with metallic metamaterials, it avoids of the loss of ohmic damping, so that the Q factor and the window transmittance can reach 1864 and 96%, respectively.
We propose a hybrid graphene/metamaterials device based on terahertz frequency. By placing the radiative and dark modes in the vertical and horizontal Si bars, we further demonstrate electromagnetically induced transparency (EIT), analogous to the atomic EIT. We theoretically investigate the strong interaction between graphene and EIT of the metamaterials. By varying the Fermi energy of graphene, the simulations show that graphene can actively modulate the transmission amplitude of EIT. Our results suggest that the demonstrated EIT in hybrid graphene metamaterials may offer new possibilities for applications in terahertz modulators and ultra-sensitive sensors.
整合大学物理和大学物理实验的内容,让理论教学与实验教学相互促进,提升大学生对物理的学习热情,提高物理的教学质量,解决独立学院物理教学课时少、内容多的矛盾。
The two dichroic ratio is the key parameter determination of molecular orientation,this paper uses electromagnetic wave theory of Langmuir-Blodgett molecules in membrane in random orientation model,uniaxial orientation mode and biaxial orientation mode under the condition of polarized absorption two dichroic ratio and angular relationship between the molecular axis orientation.
介绍了matlab对静态拉伸测量弹性模量实验数据的处理过程,使用该软件避免了繁杂的手工计算和人为计算过程造成的误差,结果精确、简单快捷,有益于提高实验教学效果。