proving that opening another door in the kitchen caused such a pressure in the room that they swinging door would move back and forth. The team also used an Emf device which stands for electromagnetic field. Emf devices make it possible to locate and track energy sources. It detects fluctuations and spikes in electromagnetic fields. The team does pick up some high emf readings in the basement. This lets the team know that there are high levels of energy readings in the basement. The team also used
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light conditions. Although more human activities are done during the day than night‚ the capability to see in the dark is still significant in many occasions. Night vision devices focuses infrared light to objects in the dark; infrared is beyond spectrum visible to the human eyes. A device for night vision was perfected during wartime giving soldiers in the battle field a technical benefit over their enemies. Vision equipment has evolved from bulky optical instruments in to lightweight goggles
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to hubs and switches. Core - the central part of an optical fiber that provides the transmission region for an optical signal. Cladding - A layer of optical glass surrounding the light-carrying core of an optical fiber. Radio waves - An electromagnetic wave used for long distance communication. Wireless WAN - A wireless wide area network‚ is a form of wireless network its a larger version of Wireless LAN. Wireless LAN - A wireless local area network links two or more devices using a wireless
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information Ex. Radio wave When the motion of the particles is perpendicular to the motion of the wave‚ it is called a traverse wave Pointing down Acceleration down Wave -> We see the motion of the medium Soundwaves -> air Lightwaves = electromagnetic waves Stadium waves -> people Water waves -> water Light waves -> no medium Pointing up Acceleration up Without tension‚ there can be no traverse waves in a medium. -> Do not occur inside liquids and gases -> can occur on surface of
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Chapter 13 – States of Matter Pressure (P) – the amount of force per unit area. Pressure=F/a or P=F/a Pascal’s Principle “Any change in pressure at a point on a confined fluid is transmitted throughout the fluid”. Any change is transmitted throughout the fluid. Buoyancy & Archimedes Principle “When an object is submerged in a fluid‚ it displaces a certain volume of that fluid. The amount of force pushing upward on the object is equal to the density of the fluid (Ï) times the acceleration
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1. Horizontal Cable- The cabling between and including the telecommunications outlet and the horizontal cross-connect. 2. Backbone Cable- A cable connection between telecommunications or wiring closets‚ floor distribution terminals‚ entrance facilities‚ and equipment rooms either within or between buildings. 3. Patch Cords- Any flexible piece of cable that connects one network device to the main cable run or to a patch panel that in turn connects to the main cable run. 4. Connectors- A device attached
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PARAGRAPH STRUCTURE Good paragraph construction depends mainly on a) thinking through each idea so that you develop it logically and clearly‚ and b) then guiding the reader through your thought processes by using appropriate joining expressions. This means making the sentences fit together properly. Most paragraphs are composed of three parts. I. Introduction: gives background information or provides a transition; should include the topic sentence (expresses the main idea to be developed
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colors are produced? As the substances are heated‚ the electrons move to higher energy levels by absorbing the heat. This state is unstable and the electrons tend to return to their ground state and release the absorbed heat energy in the form of electromagnetic energy. A portion of this energy
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Challenges and Technologies Abstract This paper reviews the sources of attenuation‚ noise and distortion encountered when communicating over AC power wiring. Various technologies which have been used to address these challenges‚ such as spread spectrum and digital signal processing‚ are then examined in light of the known channel conditions. Introduction While the idea of sending communication signals on the same pair of wires as are used for power distribution is as old as the telegraph itself
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Similar effects occur when a light wave travels through a medium with a varying refractive index‚ or a sound wave travels through one with varying acoustic impedance. Diffraction occurs with all waves‚ including sound waves‚ water waves‚ and electromagnetic waves such as visible light‚ X-rays and radio waves. As physical objects have wave-like properties (at the atomic level)‚ diffraction also occurs with matter and can be studied according to the principles of quantum mechanics. Italian scientist
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