CAREER: Electromagnetic Simulation, Modeling and Characterization of Complex Composite Materials

9624486白人这个项目的两个主要组成部分（研究和教育）之间有许多共同的主题。两者都涉及电磁学（EM），材料表征和使用计算机建模和可视化。总而言之，该项目的研究组成部分旨在建立第一个已知的严格模型，以准确预测物理现实复合材料和有效介质的有效本构参数（ECPs）。教育部分的目标是将交互式计算机工具整合到电磁入门的研究中，并将现代材料建模技术（分析和实验）整合到材料特性的高级课程中。预计这项研究工作将产生第一个准确预测物理现实复合材料和有效材料的ecp的模型。有效介质预测了物理上真实的复合材料和有效材料的ecp。有效的介质建模影响广泛的门徒，包括地球物理，遥感，电磁屏蔽，行星表面组成，电子摄影和薄膜太阳滤光片等不同领域。复合材料和有效材料的ecp及其频率依赖性的知识在电磁设计工作中绝对至关重要。没有这些知识，任何类型的电磁分析都是不可能的，因为人们将被迫对所有颗粒的散射进行建模，这当然是不切实际的。目前的宏观表征方法仅限于简化假设，例如立方阵列中稀疏分布的球形夹杂物。这个新模型将提供一个数值环境，科学家和工程师可以在其中制造、设计和评估各种颗粒混合物，以形成新的复合材料或分析有效介质。所有这些都将使用精确的数值分析来完成，并将避免传统的“千篇一律”的方法。该模型不具有与所有其他模型相同的固有局限性的原因是，从模型的基础上得到了数值上“精确”的散射解。在物理上真实的有效材料模型中固有的复杂性都在数值解中得到了考虑。这种基于计算的有效媒体建模是一种新方法，由于需要大量的计算资源，在几年前是不可行的。对于教育部分，第一个主要目标是通过使用交互式计算机可视化工具来提高EM入门课程的有效性。因为这样的入门课程是所有其他EM课程的基础，所以学生必须对该领域的基础知识有一个直观的认识。通常情况下，学生进入这门课程时对电子商务有负面的先入为主的印象。使用交互式计算机可视化可以帮助学生克服这门课程中的一些困难。在这项工作中开发的工具旨在帮助学生理解EM的基本概念，而不是像其他现有的EM可视化工具那样更高级的主题。预计这些工具将直接整合到教科书中。第二个主要的教育目标是修订和更新高级选修课的材料性质课程。本次修订将包括现代材料分析（经典和量子）的整合，以及实验方法到课程中。本项目研究部分使用的有效媒介理论的许多主题将直接与本课程相关，因为正如前面提到的，复合材料在今天被如此广泛地使用。此外，实验技术的引入将使学生接触到现代仪器，并将加强课堂教学。＊＊＊

9624486 Whites There are a number of common, themes shared between the two major components (research and education) of this project. Both involve electromagnetics (EM), materials characterization and the use of computer modeling and visualization. In summary, the research components of this project is directed at producing the first known rigorous model to accurately predict the effective constitutive parameters (ECPs) for physically realistic composite materials and effective media. The goals of the education component are to integrate interactive computer tools into the study of introductory EM and to integrate modern materials modeling techniques (analytical and experimental) into a senior-level course in properties of materials. It is envisioned that this research effort will produce the first model to accurately predict the ECPs for physically realistic composite and effective materials. Effective media predict the ECPs for physically realistic composite and effective materials. Effective media modeling impacts a broad spectrum of disciples including such diverse areas as geophysics, remote, sensing, EM shielding, planetary surface composition, electrophotography and thin-film solar filters. The knowledge of the ECPs for composite and effective materials and their frequency dependence are absolutely critical in EM design work. Without this knowledge, any type of EM analysis is not possible since one would be forced to model the scattering by all of the particulates which is certainly impractical. Current methods for macroscopic characterization are limited to simplifying assumptions such as spherical inclusions with sparse distributions in cubic arrays. This new model will provide a numerical environment in which scientist and engineers could fabricate, design and evaluate various mixtures of particles to form new composite materials or analyze effective media. All of this would be done using accurate numerical analysis and would obviate the for traditional "cut-and-dry" methods. The Reason this proposed model does not have the same intrinsic limitations as all other is that a numerically "exact" scattering solution from the basis of the model. The complexities inherent in a physically realistic effective materials model are all accounted for within the numerical solution. This computationally-based effective media modeling is a new approach and would not have be feasible a few years ago because of the tremendous computational resources that will be required. For the educational component, the first principle goal is to increase the effectiveness of introductory EM courses through the use of interactive computer visualization tools. Because such an introductory course forms the foundation for all other EM courses, it is imperative that students develop an intuitive appreciation for the basic of this field. As is often the case, students enter such a course with negative preconceived impressions of EM. The use of interactive computer visualization can help students overcome some of the difficulties in such a course. The tools to be developed in this effort are designed to help the students understand the basic concepts in EM, rather than more advanced topics as is the case with other currently available EM visualization tools. It is envisioned that these tools will be directly integrated into a textbook. The second principle educational goal is to revise and update a senior elective properties of materials course. This revision will encompass an integration of modern materials analysis (classical and quantum) as will as experimental methods into the course. Many of the topics of effective media theory used in research component of this project will pertain directly to this course since, as mentioned previously, composite materials are in such wide-spread use today. Furthermore, the introduction of experimental techniques will expose the students to modern instrumentation and will reinforce the classroom instruction. ***