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舟山第一小学紧邻舟山市人民政府,是目前新城建设规格最高的一所公办小学。学校有台式电脑300多台,手提电脑12台,办公基本实行无纸化。有一套非线性编辑设备,学校全部教室配有多媒体电教平台,设施设备达到一流水准。学校新址于2005年开始兴建,占地2．7公顷,建筑面积11000多平方米,总投资4700万元左右,2007年9月建成使用。目前学校共有25个班级,1100多名学生,100多名教职工。 相似文献
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In this paper, we summarize some recent activities in the field of metamaterial research at the National University of Singapore （NUS）. Integral equations are applied for electromagnetic modelling of supernatural materials. Some special characteristics of the metamaterials are shown. Moreover, quasi-static Lorentz theory and numerical method （i.e., the method of moments for solving the electric field integral equation） and the transmission line theory are both presented to obtain the effective constitutive relations of metamaterials, respectively. Finally, feasibility of fabricating metamaterials based on analysis of equivalent transmission line model in the microwave spectrum and even higher is also shown and correspondingly some broad-bandwidth and low-loss metamaterial structures are designed and synthesized. 相似文献
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INTRODUCTION Conventional materials have positive magnetic permeability and mostly positive electrical permittiv- ity. Veselago (1968) initially assumed a material with negative permittivity and permeability simultane- ously and theoretically demonstrated the abnormal electromagnetic properties. This material, referred to as left-handed material (LHM) or metamaterial, re- verses a basic feature of light, such as, the reversal of the Doppler shift for radiation, and negative refractive in… 相似文献
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