Amplifiers with Tuneable Long-Period Gratings Thabiso J. Nhlapo‚ Pieter L. Swart‚ and Anatoli A. Chtcherbakov Centre for Optical Communications and Sensors Faculty of Engineering‚ Rand Afrikaans University PO Box 524‚ Auckland Park 2006‚ South Africa Abstract-This paper presents an adaptive gain equalization technique of the gain spectrum for an Erbium Doped Fibre Amplifier (EDFA) by using a tuneable Long-Period Grating ) (LPG). The gain spectrum of an EDFA at a wavelength of ) 1530nm was equalized from
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will be no more elections to determine who is president. He‚ the current president‚ will remain in office until he dies. Obama claims that we the people will not lose our rights to vote‚ freedom of speech‚ and freedom of the press. Yet‚ I wonder‚ how long will our freedoms last. For the first time in the history of the United States of America‚ we have a leader who has elected themselves to run our government permanently. The scenario above is extremely possible‚ especially if Trump is chosen to
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advised me to use muscle building workouts that use free weights‚these are not as good as the muscle building supplements that we see today‚after some time i discovered what i was drinking was calories‚i
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Inhibitory activities of rubrofusarin and its derivatives against AChE‚ BChE and BACE1 In order to evaluate the anti-AD potential of the isolated rubrofusarin and its four derivatives‚ we evaluated their abilities to inhibit AChE‚ BChE and BACE1. Results are summarized in Table 1. Of the derivatives‚ 3 showed most potent activity against AChE with an IC50 of 15.94 ± 0.32 µM whereas 2 had least inhibitory activity (148.08 ± 2.09 µM). 4 and 5 exhibited moderate inhibition with IC50 value of 86.05 ±
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Cambrian period 543-490 million years Introduction The Cambrian Period marks the beginning of the Paleozoic Era. This period gets its name from a place in Wales where the first examples of this type of ancient life was found. The period lasted for nearly 53 million years‚ from about 543 million years ago until 490 million years ago. The Cambrian Period marks an important point in the history of life on earth; it is the time when most of the major groups
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extent of non-performing loans in state-owned banks‚ among the four largest Chinese banks‚ CCB was recognized for its profitability as well as for having the lowest non-performing loans. We could consider the matter from different standpoint. It could think that BAC’s shareholding investment is not only for entry to the Chinese market‚ but also for making a profit from investment in stocks. Secondly‚ CCB was among the market leaders in China in a number of products and services including infrastructure
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Weight‚ length and angle of the swing of a pendulum will be the star of this chapter. First‚ I will describe how the weight of the bob in the swing of a pendulum affects the amount of swings that a pendulum can swing in a certain amount of time. If the bob is light‚ like a penny or a paper clip‚ the pendulum can swing a large amount of times because the pendulum does not have a lot of weight to carry at the end of it. If the bob at the end of the string is heavy‚ like a half-dollar or a quarter‚
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In this Essay‚ I am going to explain the long and short causes of World War two. The war was caused by both long and short causes‚ From October 1929 an economy depression happened in America‚ it spread all around the world. Due to this million of people were throw away from the work and some of them starve to death. As this happened lot of people were angry and they turned to political extremists. After this In Germany and Italy‚ fascist dictators such as Hitler came to power and in Japan started
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How the giraffe got it’s long neck Once upon a time‚ there lived a giraffe called Mirabelle. Mirabelle was the only giraffe in the world‚ and what was very strange about her was that she had a really short neck. Her neck was so short that Tony (The elephant ) had to bring down her food from the tree with his trunk . One day it was Mirabelle’s birthday and all the other animals wanted to surprise her by giving her a taste of the bee’s honey for the first time. She was really over the moon when
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Sensitive Periods Table of contents Sensitive Periods Main points Characteristics Sensitive period for Order Sensitive Period for Perfecting Movement Sensitive Period for Language. Sensitive Period for the Senses and small objects. Sensitive Period for Social Relations Significance For Education Adults Role. SENSITIVE PERIODS Main Points The term "Sensitive Period" was first used by Hugo De Vries
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