Whites‚ EE 481 Lecture 10 Page 1 of 10 Lecture 10: TEM‚ TE‚ and TM Modes for Waveguides. Rectangular Waveguide. We will now generalize our discussion of transmission lines by considering EM waveguides. These are “pipes” that guide EM waves. Coaxial cables‚ hollow metal pipes‚ and fiber optical cables are all examples of waveguides. We will assume that the waveguide is invariant in the zdirection: y Metal walls b ‚ x z a and that the wave is propagating in z as e
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sulphur. Uncooked red kidney beans‚ some toadstools‚ daffodil bulbs‚ puffer fish and green potatoes are all poisonous to humans. (a)When considering chemical poisoning it is important to take into account poisonings caused by ingestion of metallic elements. Metallic poisoning usually involve the heavy metals those with a pH greater than 5. Heavy metal poisoning can be acute or chronic it can be caused by lead‚ mercury‚ iron‚ thallium‚ Bismuth‚ cadmium‚ copper‚ tin‚ zinc. Heavy metal contamination
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densisty of earth is 5.5 gm/cm3 density of crust 2.6-3.0 gm/cm3 provides some information regarding the density of the interior zones. -earth has a magnetic field supports the argument for the core being metallic and the outer core being liquid (i.e.‚ convecting electrons surrounding metallic solid inner core will generate magnetic field). -seismic properties (velocities‚ absorption of S-waves by outer core). -Why do P-wave and S-wave shadow zones form? Why is the S-wave shadow zone larger
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by phonon vibrations. Metals (e.g. copper‚ platinum‚ gold‚etc.) are usually good conductors of thermal energy. This is due to the way that metals are chemically bonded: metallic bonds (as opposed to covalent or ionic bonds) have free-moving electrons which are able to transfer thermal energy rapidly through the metal. The "electron fluid" of a conductive metallic solid conducts most of the heat flux through the solid. Phonon flux is still present‚ but carries less of the energy. Electrons also conduct electric current through
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Chemistry SL Magnesium Oxide Lab Report Rashpreet Singh Date Performed: November 6‚ 2014 Research Question: To determine the empirical formula of the compound which forms between magnesium and oxygen. Design: The following figure represents the experiments lab setup‚ visualize the equipment used. Materials: Done 1. Ceramic evaporating dish 2. Electronic balance 3. Bunsen burner 4. Retort stand‚ ring clamp‚ clay triangle 5. Sand Paper 6. Tongs 7. Magnesium Ribbon Safety: Done 1. The duration
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Will Perry Definitions: CoronaTop layer of the sun atmosphere that extends from the top of the chromosphere and ranges in temperature from 1 million to 2 million K. Tidal EffectsTides are the rise and fall of sea levels caused by the combined effects of gravitational forces exerted by the Moon‚ Sun‚ and rotation of the Earth. Some shorelines experience two nearly equal high and low tides each day‚ called a semidiurnal tide. Marias a dark region of considerable extent on the surface of the moon
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Oresteia Live It is said‚ “Aeschylus’ theatrical genius can be fully appreciated only through an awareness of the context in which these plays were performed” and the Royal National Theatre’s production of the Oresteia demonstrates this principle (Aeschylus xi). Elements such as the music‚ costumes‚ scenery‚ and actors in the live production highlights different relationships within the play‚ which allows for an audience to have a different interpretation of the plays than someone who might read
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Ecuador Essay Ecuador is a very fascinating country. Scientists can use the past information about the geography to figure out the future. For instance‚ learning how the land has transformed over time in Ecuador may lead to a continuous pattern. Other things that scientists use are tools and techniques. Identifying various rocks and minerals‚ discovering how the land has been changed‚ and observing mountain formations and fossils also help to figure out patterns. All of these things allow scientists
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BTEC in a Box Classifying engineering materials and investigating their properties In this assignment you will: find and present information about the internal structure of materials used in engineering classify materials as either metallic or non-metallic identify the properties of materials and understand how they influence the choice of a material for a particular purpose. investigate the behaviour of materials in service and relate this to their properties. Your Role You are nearing
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electrons‚ both atoms are able to complete their highest energy level‚ meaning the atom is stable. Metals form giant structures in which electrons in the outer shells of the metal atoms are free to move. The metallic bond is the force of attraction between the free electrons and metal ions. Metallic bonds are strong‚ so metals can maintain a regular structure and usually have high melting and boiling points. Metals are good conductors of electricity and heat‚ because the free electrons carry a charge
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