A character string is said to have periodkif it can be formed by concatenating one or more repetitions of another string of lengthk. For example, the string "abcabcabcabc" has period 3, since it is formed by 4 repetitions of the string "abc". It also has periods 6 (two repetitions o...
“periodic”指事件或现象以固定时间或规律间隔重复发生的特性,常见于科学、数学及日常语境中。例如,化学元素的周期性规律、物理中的周期运动以及生活中的定期活动均体现了这一概念。 一、基础定义与核心特征 “periodic”意为“周期性的”或“定期的”,其核心在于描述事件或现象在时间...
Simulation and optimization of 1-D periodic dielectric nanostructures for light-trapping Light-trapping is essential to improve the performance of thin-film solar cells. In this paper, we perform a parametric optimization of 1-D square and sinu... P Wang,R Menon - 《Optics Express》 被引量:...
A common approach to perform dispersive analyses of waveguides periodic along one direction is based on the electromagnetic simulation of a single spatial period of the structure. However, the resulting equivalent two-port network representation of the single cell may lead to inaccurate modal results,...
Here we report on the formation of versatile silica/carbon composites via carbonization of ethyl-bridged periodic mesoporous organosilica (PMO) mesophases and show that they are suitable precursors for the preparation of mesoporous silica and nanostructured carbon....
【题目】You are probably use d to the periodic(定期的) upgrades in our rell-phune networks. There was 2G,which came along in 1991, replace d with 3G in 2001, followe d by 4G in 2009, Now we're hearing about the cming 5G.But the 5G is a much higger leap than what's come ...
The word "periodic" has several meanings, but in general, it refers to something that happens or repeats at regular intervals of time. Here are a few examples of how it can be used in sentences: Periodic Reviews: "The company conducts periodic reviews of its financial statements to ensure ...
D.; Mokaya, R. To stir or not to stir: Formation of hierarchical superstructures of molecularly ordered ethylene-bridged periodic mesoporous organosilicas... D Dubé,M Rat,F Béland,... - 《Microporous & Mesoporous Materials》 被引量: 69发表: 2008年 Versatile approach to synthesis of 2-D ...
Functionalization of periodic mesoporous organosilicas (PMOs) with high loadings of pendant organic groups to form bifunctional PMOs with ordered mesostructures remains a challenging objective. Herein, we report that well-ordered ethane-bridged PMOs functionalized with exceptionally high loadings of pendant ...
The MakePeriodic command removes kinks from a curve or surface.Periodic curve A periodic curve is a smooth closed curve. Periodic curves stay smooth when you edit them. Periodic Surface Periodic surfaces are closed surfaces (such as a cylindrical surface) that can be deformed without developing...