Title: Highly Efficient Synthesis of Helical Carbon Nanocoils and Their Applications
Due to their specular 3D helical morphology, carbon nanocoils (CNCs) have superior electromechanical properties to the other carbon materials, which show potential applications in supercapacitors, microwave absorption materials, near-infrared detectors, elastic composites, and sensors.
In this presentation, we report the high-yield, high-purity and large quantity synthesis of CNCs and their growth mechanism, which are the foundation of the CNC composites and their applications. It is found that the super elastic CNCs and their composites are excellent sensing mediums, which can be used in multi-functional strain-temperature-humidity sensing, glucose sensing, and infrared sensing. Meanwhile, CNCs can easily form a three-dimensional framework to construct hierarchical porous structures with the other materials, which is suitable for high efficient electrodes of supercapacitors and batteries. Furthermore, CNCs are also excellent fillers for microwave absorbers because of their moderate conductivity, chirality and multiple-loss mechanisms.
This work was supported by the National Natural Science Foundation of China (NOs. 51972039, 51661145025, 11274055, 51803018), and LiaoNing Revitalization Talents Program (No. XLYC1902122).
He is a Professor in School of physics, Dalian University of Technology. He was selected as distinguished professor of Liaoning Province in "Liaoning Revitalization Talents Program". He graduated from Xi'an Jiaotong University in 1988, obtained his doctoral degree from Osaka Prefecture University in 2000 and remained as an assistant professor. He became a professor of Dalian University of Technology in 2007. His main research fields are the preparation, physical properties and application of nanostructures and materials. He has presided over and participated in a number of projects of NSFC, Key international cooperation projects and 863 projects, published more than 160 papers in important international SCI journals, cited more than 3300 times, edited or participated in the compilation of 5 scientific research monographs and teaching materials. He has made many innovative achievements in the basic research of carbon nanomaterials, especially in the growth control of carbon nanocoils, their photoelectric, mechanical and thermal properties, and their applications in energy, sensing and microwave absorption.
Title: Propagation Prediction Based on Physical Optics
Physical optics (PO) or Fresnel-Kirchhoff theory forms the base to solve the problem of diffraction over terrain or buildings, particularly when the terrain or buildings can be modeled as knife edges. Because the numerical integration required to solve the realistic problems is very time-consuming, physical optics is not commonly used in the original formulations for developing the related software products. In order to increase the computational efficiency, a number of assumptions and simplifications have been made. In this presentation, Fresnel-Kirchhoff theory is briefly reviewed, the assumptions and simplifications made for improving the computational efficiency is explained and clarified, the software performance is analyzed through the comparison between prediction and measurement, the inherent drawbacks of the software and its limitations in application are discussed, and possible improvement of the prediction algorithm and procedure is proposed.
Qingsheng Zeng (S'97--M'02--SM'11) received his Ph.D. from University of Ottawa, Canada, and is currently a distinguished professor and PhD advisor of Nanjing University of Aeronautics and Astronautics (NUAA), an adjunct professor and PhD advisor of University of Ottawa, Carleton University, Université du Québec an Outaouais (UQO), and Institut National de la Recherche Scientifique -- Centre Energie, Matériaux et Télécommunications (INRS-EMT), a guest professor of Harbin Engineering University (HEU), Northwestern Polytechnic University (NWPU), Beijing University of Post and Telecommunications (BUPT) and Beijing Jiaotong University (BJTU). He has been a research engineer and a senior research engineer at Communications Research Centre Canada (CRC), Government of Canada. Dr. Zeng has undertaken research and teaching in several fields, including antenna analysis and design, electromagnetic compatibility and interference (EMC/EMI), ultrawideband technology, radio wave propagation, computational electromagnetics. He has been the Chair of AP (Antennas and Propagation) / MTT (Microwave Theory and Techniques) Joint Chapter and Secretary of EMC (Electromagnetic Compatibility) Chapter of IEEE Ottawa, a Member of IEEE Canada Industry Relations Committee, and a senior member of IEEE. Dr. Zeng has been a member of the Strategic Projects Grant (SPG) Selection Panel (Information and Communications Technologies B) for the Natural Sciences and Engineering Research Council of Canada (NSERC), a member of Site Visit Committee of NSERC Industrial Research Chair (IRC), and a reviewer of NSERC Industrial R&D Fellowships.