Abstract: In this lab‚ the chemical components of Excedrin and Tylenol‚ two common‚ over-the-counter analgesic drugs‚ were determined by utilizing the technique of thin-layer chromatography‚ or TLC. The active ingredients of Excedrin were caffeine‚ acetaminophen‚ and aspirin with Rf values of 0.11‚ 0.38‚ and 0.61‚ respectively. The lone active ingredient of Tylenol was acetaminophen with an Rf value of 0.39. The elution sequence obtained in the experiment is as follows: ibuprofen (least polar)
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Abstract This paper will provide a brief overview of the problems that led to the collapse of Lehman Brothers and the concerns expressed by former Senior Vice President‚ Mathew Lee. Next we will explore the kind of behaviors that led to the downfall of Lehman Brothers and other ill-fated companies. Additionally we will explore several theories regarding actions that leadership can take to create an environment‚ which encourages transparency and prevents large-scale ethical breaches. Finally
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Principles of Economics Components of Economy First Semester Introduction Human activities which generate income are known as economic activities. All the economic activities are classified into three categories viz. primary‚ secondary and tertiary. Activities that are directly associated with environment are known as primary activities as they refer to utilization of natural resources like land‚ water‚ vegetation‚ minerals etc. When primary goods are used to produce some other articles or
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of the clay strips.Observe what is happened to the clay strips. What have you found out? 1.What happened to the layers of the clay after they were pushed at both ends? ANS. The layers of the clay risen. 2.What type of plate boundary is showed when both ends are pushed? ANS.Convergent boundary 3. What happened to the layers of the clay after they were pull at both ends? ANS.The layers of the clay move away from the cardboard. 4. What type of plate boundary is showed when both ends are pulled? ANS
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Thin Film is first generated in the 20th Century. With the rapid development of resource and advance scientific knowledge on preparation‚ structure evolution and the properties of thin film‚ more advance and sophisticated thin film are created by preparation devices and method based on advances in vacuum technology[1]. Thin Film is a second generation of solar cells after silicon solar cells. This smart material reacts to temperature variations‚ electricity or magnetic fields or pressure variation
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ozone layer or ozonosphere‚ region of the stratosphere containing relatively high concentrations of ozone‚ located at altitudes of 12-30 mi (19-48 km) above the earth’s surface. Ozone in the ozone layer is formed by the action of solar ultraviolet light on oxygen. The ozone layer prevents most ultraviolet (UV) and other high-energy radiation from penetrating to the earth’s surface but does allow through sufficient ultraviolet rays to support the activation of vitamin D in humans. The
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INDEPENDENT COMPONENT ANALYSIS A Tutorial Introduction James V. Stone Independent Component Analysis Independent Component Analysis A Tutorial Introduction James V. Stone A Bradford Book The MIT Press Cambridge‚ Massachusetts London‚ England © 2004 Massachusetts Institute of Technology All rights reserved. No part of this book may be reproduced in any form by any electronic or mechanical means (including photocopying‚ recording‚ or information storage and retrieval) without permission
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in Hong Kong The ozone layer present in the stratosphere of the Earth is utmost important to us as it protects us from the exposure of ultraviolet rays which leads to several harmful effects. Without the ozone layer‚ human will be more prone to skin cancer and eye cataracts. Ultraviolet rays can also cause harm to marine life by reducing the amount of planktons and consequently depreciates the amount of fishes in the ocean. Besides that‚ the depletion of the ozone layer disrupts the production of
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streams down every window‚ Layers of Fear ticks the first box in the list of horror clichés straight from the off. That’s not to say this psychedelic first-person horror doesn’t offer anything unique. Starting out in a seemingly empty 19th-century mansion certainly sets an uncomfortable tone‚ and aided by the rambling narrative of an artist who has completely lost his mind - Layers of Fear consistently unsettles you. While it’s forgivable to consider the concept of Layers of Fear as unoriginal‚ it
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Link Layer Our goals: ❒ understand principles behind data link layer services: ❍ ❍ ❍ ❍ ❒ error detection‚ correction sharing a broadcast channel: multiple access link layer addressing reliable data transfer‚ flow control: done! instantiation and implementation of various link layer technologies 5: DataLink Layer 5-1 Link Layer ❒ ❒ ❒ ❒ ❒ 5.1 Introduction and services 5.2 Error detection and correction 5.3Multiple access protocols 5.4 Link-Layer Addressing
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