Solar System About 4‚700 million years ago‚ the Solar System was just a spinning disc of dust and gas. The dust began to collect together and our Sun formed at the centre. Around Sun‚ lumps of rock joined up to form smaller bodies and‚ like the Sun‚ they heated up. But because they were smaller they soon cooled down and became planets. Sun accounts for 99.85 per cent of mass of the solar system. About 1.3 billion earths would fit inside the sun. The solar system consists of the Sun; the nine planets
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Muscular System Animations 1. How do nerve impulses cause muscle contraction? Skeletal muscle is under voluntary control. Nerve impulses that originate in the central nervous system cause muscles to contract. Both neurons and muscle tissue conduct electrical current by moving ions across cellular membranes. A motor neuron ends in a synapse with a muscle fiber. The neuron releases acetylcholine and transfers the action potential to the muscle tissue. The signal will travel through the tissue
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In order to release that energy‚ certain anabolic and catabolic reactions take place. The three main energy systems are ATP Pcr‚glycolytic and oxidative; oxidative having three futher subgroups. These are discussed below ATP Pcr The ATP Pcr system is a constituent of Adenosine triphosphate and phosphocreatine. This energy system provides high energy in minimal time. The stored phosphates contain excessive/high energy which are broken down upon activity therefore releasing energy at a very fast
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(877) 322-5800 F: (877) 322-4774 info@cedengineering.com COOLING WATER PROBLEMS AND SOLUTIONS Water is used in cooling systems as a heat transfer medium and frequently also as the final point to reject heat into the atmosphere by evaporating inside cooling towers. Depending on the quality of available fresh water supply‚ waterside problems develop in cooling water systems from: • Scaling • Corrosion • Dirt and dust accumulation • Biological growth Any of these problems
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Information System Architectures: From Art to Science Peter C. Lockemann Fakultät für Informatik Universität Karlsruhe Postfach 6980 76128 Karlsruhe lockeman@ipd.uka.de Abstract: The presentation claims that architectural design plays a crucial role in system development as a first step in a process that turns a requirements specification into a working software and hardware system. As such‚ architectural design should follow a rigorous methodology – a science – rather than intuition –
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publications and other professional conferences and journals. He is a coauthor of the textbook Database System Concepts. He has also written Op-Ed articles for the New York Times‚ the Boston Globe‚ and the Hartford Courant‚ among others. Peter Baer Galvin is the chief technologist for Corporate Technologies (www.cptech.com)‚ a computer facility reseller and integrator. Before that‚ Mr. Galvin was the systems manager for Brown University’s Computer Science Department. He is also Sun columnist for ;login:
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You might be at a location where there is only one Ethernet connection available (hotel room‚ office or meeting room etc.) and you need to share the Internet connection with other people or devices. Connectify is a free utility which is light on system resources and makes it easy for you to set up your Windows 7 machine as a secure WiFi hotspot. Note: Connectify only works with Windows 7 Home and above‚ Starter is not supported. Connectify Installation is quick and easy‚ and once complete‚ you
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UNIT ONE: the digestive system Digestion breaks down larger molecules into smaller ones. Mouth. Oesophagus is the tube that takes food from the mouth to the stomach using waves of muscle contractions called Peristalsis. Mucus is secreted from the tissues to lubricate the foods passage. Mouth. Oesophagus is the tube that takes food from the mouth to the stomach using waves of muscle contractions called Peristalsis. Mucus is secreted from the tissues to lubricate the foods passage. Many
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Musculoskeletal: The human musculoskeletal system or the locomotor system is made from cartilage‚ bones‚ ligaments‚ tendons and muscles. This system give humans the ability to move using their muscular and skeletal systems. The musculoskeletal system is being controlled by the nervous system to provide voluntary movements. The skeletal system and the muscle system maintain to posture and produce heat for the body. Increased blood supply: As people start to exercise the muscles will start wanting
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decomposition of hydrogen peroxide with a fixed mass of catalyst. A catalyst is a substance‚ which alters the speed‚ or rate of a chemical reaction but is chemically unchanged at the end of the reaction. The two factors that we can change are the temperature and the concentration. We chose to vary the concentration of hydrogen peroxide. The catalyst to speed up the reaction without affecting the result will be manganese oxide. Prediction: I predict that the higher the concentration of hydrogen peroxide
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