5. Results & Discussion : The optical nonlinearity of DASPB doped PMMA-MA polymer film is studied using open aperture and closed aperture Z-scan techniques by means of low power CW laser at different dye-doping concentrations. The open aperture Z-scan study shows that the dye-doped sample shows a considerable amount of saturable absorption property. But at higher input intensity‚ the two-photon absorption and the reverse saturation absorption properties of the dye in polymer film becomes prominent
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Photography Photography is the art‚ science and practice of creating durable images by recording light or other electromagnetic radiation‚ either chemically by means of a light-sensitive material such as photographic film‚ or electronically by means of an image sensor.[1] Typically‚ a lens is used to focus the light reflected or emitted from objects into a real image on the light-sensitive surface inside a camera during a timed exposure. The result in an electronic image sensor is an electrical
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enclosed hollow with an opening (aperture) at one end for light to enter‚ and a recording or viewing surface for capturing the light at the other end. A majority of cameras have a lens positioned in front of the camera’s opening to gather the incoming light and focus all or part of the image on the recording surface. Most 20th century cameras used photographic film as a recording surface‚ while modern ones use an electronic camera sensor. The diameter of the aperture is often controlled by a diaphragm
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VSAT-VERY SMALL APERTURE TERMINAL The 1980s began the rapid introduction of new satellite services and new participants in satellite communications. Nearly 100 countries were involved in satellite communications – providing either satellite systems or satellite-based services. This decade also saw the advent of new and innovative ways to pay for the high costs of satellite systems and services‚ including lease/buy options‚ private networks (often referred to as very small antenna terminals
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a refractor) can collect from distant objects. Nominally‚ it is proportional to the square of the diameter of the aperture. Doubling the aperture results in gathering four times as much light. Resolving: Resolving power is a measure of the amount of detail that is possible to see in the image. Nominally‚ it is proportional to the diameter of the aperture. Doubling the aperture results in resolving details that are half the size‚ ideally‚ at least. Magnification: Magnification is not an inherent
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resolving power (ability to distinguish between two nearby points) and not magnification. 2. Mircoscope resolution is limited by the wavelength of the source of illumination (visible light‚ in the case of an optical microscope) and the numerical aperture of the lenses. Smallest object viewable limited by resolution which is limited by wavelength of the source of illumination and N.A of the lenses. Lab: Stero microscope low power instrument used in visualizing large objects at low magnification
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to an alternating current element. 2. Explain how the solutions to wave equations are arrived? 3. (i)Derive the relationship between directivity & effective aperture. (ii)State and prove reciprocity principle with regard to antenna. 4. What are the various types of apertures? Find the effective aperture of a dipole antenna. 5. Explain the following (i)Vector effective length (ii)Antenna temperature 6. Write short notes on
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Lappeenranta University of Technology. Degree Programme in Chemistry. Master’s Thesis. Kubat‚ J. & Steenberg‚ B. 1955. Screening at low particle concentrations. Svensk. Papperstidning 58(9)‚ pp. 319-324. Kumar‚ A. 1991. Passage of fibres through screen apertures. University of British Columbia‚ Vancouver‚ Canada. Ph.D. Thesis. Levis S.H. 1991. Screening of secondary fibers. Progress in Paper Recycling 1(1)‚ pp. 31-45. Martin A.‚ Michael W.‚ Zuben W. 2005. Internal fibre length concentration in a pressure
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connecting point like this and has no blind spot. Table: Similarities & the Difference between Camera and Human Eye Function Camera Human Eye [pic] Similarities Camera • Opening for light to enter- Aperture • control the amount of light entering camera/eye- Diaphragm control size of aperture • refract light-glass biconvex lens • object of light action to form image-photosensitive chemicals on film • absorb excessive light to prevent multiple images formation-dark internal surface
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4002DFPHAR PHYSICAL PHARMACEUTICS Particle Size Analysis The study of particle dimensions is important in many areas of manufacture and technology. Many solid materials are at some point powder or granular in form e.g. foods (grain‚ flour‚ sugar)‚ ceramics and building materials (sand and cement). In pharmaceutical development and manufacture‚ particle size greatly influences physical properties such as powder flow‚ powder mixing‚ drug dissolution‚ deposition from inhaler devices and the stability
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