microscopy professor: Ernesto Suarez by ananthalakshmi adapa University of Hartford What is a electron microscopy? An electron microscope (EM) is a type of microscope that uses an electron beam to illuminate a specimen and produce a magnified image. An EM has greater resolving power than a light microscope and can reveal the structure of smaller objects because electrons have wavelengths about 100‚000 times shorter than visible light photons
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system. Figure 1: Layout off scanning Electron Microscope. In the optical part of instrument‚ the first thing we notice is the need for a source of illumination. No visible photons of light are produced within the SEM but an invisible beam of electrons. The beam is produced from an electron gun’ and a cross-section through a simplified electron gun is shown below. Figure 2: Cross-section through an electron gun A V-shaped tungsten filament (I) is heated electrically to about 2700Kand the
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Introduction! ! The Michelson Interferometer is commonly used to determine the wavelength of light or measure very small distances. It was invented by Albert Abraham Michelson and is commonly used in optical interferometry‚ a branch of physics involving a family of techniques one could use to extract information about waves by superimposing them. ! ! The original application of the Michelson Interferometer was to the famous Michelson-Morley experiment in 1887. Prior to Einstein’s
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is retrieval of information from the disk‚ where a light beam scans the surface. Modulation in the reflected light is used to detect the data-mark pattern under the scanning spot. The process for exposing data marks on a recordable optical disk is shown in Fig. 3‚ where an input stream of digital information is converted with an encoder and modulator into a drive signal for a laser source. The laser source emits an intense light beam that is directed and focused onto the surface with illumination
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directly through the atmosphere via laser beams over paths from a few meters to 4 km or longer. FSL uses lasers in the near-infrared spectrum‚ typically at wavelengths of 850 or 1550 nm. Given these wavelengths‚ atmospheric attenuation must be considered‚ and an adequate margin of optical power (dB) must exist to support high system availability (the percentage of time that an FSL link is in operation‚ typically 99.9%). A visual range of 100 m can attenuate a laser beam at a rate of nearly 130 dB km−1. For
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(h) (i) (j) 2 2. A rectangular beam with a cross section 200 mm x 100 mm spans 6 metres and carries a uniform load of 2 kN/m. a) Calculate the reactions. b) Draw the shear force and bending moment diagrams. c) Calculate I for the cross section‚ about the axis of bending. d) Calculate the maximum compressive stress in the beam‚ and show where it occurs along the length‚ and on the cross section. e) Calculate the maximum tensile stress in the beam‚ and show where it occurs along the length
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Republic of the Philippines Department of Education DepEd Complex‚ Meralco Avenue Pasig City K to 12 Curriculum Guide MATHEMATICS (Grade 1 to Grade 10) December 2013 K to 12 BASIC EDUCATION CURRICULUM Figure 1.The Conceptual Framework of Mathematics Education K to 12 Mathematics Curriculum Guide December 2013 Page 2 of 109 K to 12 BASIC EDUCATION CURRICULUM CONCEPTUAL FRAMEWORK Mathematics is one subject that pervades life at any age and in any circumstance. Thus‚ its value goes beyond
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VICTORY! “When you walk into the gym you leave everything behind. It’s like a total different world. It’s you second family. We gymnasts spend more time in the gym then with our parents. We do gymnastics not to please our family but to please ourselves.” The day I found out all my training was worth it‚ was at the Glencoe- Silver Lake Gymnastics Invite. I got to this moment by joining gymnastics and making the high school team‚ going to practice every day and giving it my all‚ and all the other
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pipette B about 1/5 full of 1.0 M NaOh (sodium hydroxide). 2. Place the 2 Pipets on the beam balance and read and record the total mass of the 2 pipets. 3. Carefully telescope the stem of pipet A into the stem of pipette B without spilling any liquid. 4. Mix the solutions by gently squeezing the bulb of pipette A into pipet B. Record any observations. 5. Place the apparatus on the beam balance and record the final mass. 6. Rinse both pipets and if any liquid spills rinse
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inelastic strain energy and state units of strain energy. 4. Derive an expression for strain energy stored in one-dimensional structure under axial load. 5. Derive an expression for elastic strain energy stored in a beam in bending. 6. Derive an expression for elastic strain energy stored in a beam in shear. 7. Derive an expression for elastic strain energy stored in a circular shaft under torsion. 2.1 Introduction In the analysis of statically indeterminate structures‚ the knowledge of the displacements
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