4. The Medium Access Sub Layer Broadcast channels [or multi-access channels] are a category of networks and the key issue is how to determine who gets to use the channel when there is competition for it. The protocols which define these factors belong to a sub layer of data link layer called the MAC(medium access control)sub layer. ALOHA: Norman Abramson devised a new and elegant method to solve the channel allocation problem called the “ALOHA” system which used ground-based Radio broad
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INTRODUCTION 1.1 Background of the Experiment Mass density describes how heavy an object is. Defined by the Greek letter ρ‚ read as rho‚ density is a basic yet important physical property of matter. For a bulk body without accounting its existing pores and voids‚ density is represented by the ratio of its mass and volume. It is given by the equation ρ= massvolume 1. The SI unit of density is kg/m3. However‚ its CGS units‚ g/cm3 or g/ mL‚ are the most commonly used ones in the laboratory. The
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Experiment: determination of densities Introduction The density of a sample of matter represents the mass contained within a unit volume of space in the sample. For most samples‚ a unit volume means 1.0 ml. The units of density‚ therefore‚ are quoted in terms of grams per milliliter (g/ml) or grams per cubic centimeter (g/cm3) for most solid and liquid samples of matter. Density is often used as a point of identification in the determination of an unknown substance. The density of the unknown might
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Experiment #1: Thin-Layer Chromatographic Analysis of Drug Components | Performed on: Wednesday‚ May 8th‚ 2013 | | | 5/15/2013 | | Introduction: The goal of this experiment was to identify an unknown analgesic drug through the use of thin-layer chromatography. The drugs used were‚ Unknown #1‚ caffeine‚ aspirin‚ and acetaminophen. Thin-Layer Chromatography is a technique for identifying substances using a mobile phase (developing solvent) that draws up through a
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Bubbles Up: A Science Experiment on Density Density is the measure of the quantity of some physical property [usually mass] per unit length‚ area‚ or volume (YourDictionary.com). How does temperature affect density? Do items become denser after being frozen? It is well known that water becomes denser when it ’s temperature lowers until its freezing point. Does this principle apply to oil; and if so‚ which kinds? This question easily applies to real world problems. For example‚ when there is an
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Experiment Density‚ Accuracy‚ Precision And Graphing OBJECTIVES 1. The determination of the density of water 2. A comparison of the accuracy and precision of a graduated cylinder and a pipet EXPERIMENTAL MATERIALS Part A A 50mL graduated cylinder A balance 50.0mL deionized water A rubber policeman Part B A 100mL beaker A 50mL graduated cylinder A volumetric pipet 120.0mL deionized water A thermometer A rubber policeman
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The Density Challenge: A Complete Inquiry Activity Introduction Density has been an important part of science for a very long time. Density was discovered by Archimedes‚ a Greek mathematician‚ around 250 BC while determining whether a craftsman had replaced some of the gold in the King of Syracuse’s crown with silver. Density is the compactness of a substance. The new concept of density he discovered was used to expose the fraud. The purpose of this experiment is to make
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Three attacks in SSL protocol and their solutions Hong lei Zhang Department of Computer Science The University of Auckland zhon003@ec.auckland.ac.nz Abstract Secure Socket Layer (SSL) and Transport Layer Security (TLS) is the protocol above TCP‚ which can protect user’s privacy when they sending data from a client side to a web server‚ this is an important protocol due to the expansion of Internet. In fact‚ it is a long way to make the SSL/TLS protocol perfectly. However there are still
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test tube. 10.35g 5. Mass of the filled test tube. 29.89g 6. Mass of liquid in test tube. 19.54 7. Temperature of the water. 22ºc Part B Aluminum Sinker 1. Mass of object. 6.87g 49.44g 2. Volume of the water in the graduated Cylinder after the addition of the object. 17.5mL 19mL 3. Volume of the object due to displacement 2.5mL 4mL 4. Density of object. 2.748 12.36 5. Calculated mass of the sinker in ounces 1.74g Part C 1. Length
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Report Determining the Density of Various Liquids and Solids The purpose of this experiment is to determine the weight (density) of certain liquids and solids in chemistry. These liquids include; Water‚ Hexane‚ Carbon Tetrachloride‚ and solids include; Copper‚ Zinc‚ Lead and‚ Aluminum. It’s important to know the weight of these products so you can properly conduct experiments and make clear observations. Different techniques will be used to determine these densities and one in particular is
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