... . While they are all dedicated to the same task, reading a bar code, each scanner type offers both advantages and disadvantages, and none is clearly superior in all cases. Hand held laser scanners are the most expensive of the scanning devices, but offer the largest depth of field making them an appropriate choice for a wide variety of non-contact applications. Hand held ... laser scanners use a laser diode to create a scan line by projecting a beam of energy off a rotating prism or oscillating mirror. The beam is reflected out the scanner window onto the bar code, where ... of light is...

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... decrease. To get the resistance without using Ohm's law you can use the following equation; R = x L A R = Resistance (Ω) = Resistivity (Ω m) L = Length (m) A = Cross Sectional Area (m) This equation allows us to predict the actual resistances of our wires successfully (to a degree) .28 (A = Πr = 6.12x10-8 m) ... 0.6 4.9 x 10-8 x 0.6 6.12 x 10-8 4.77 0.7 4.9 x 10-8 x 0.7 6.12 x 10-8 5.57 0.8 4.9 x 10-8 x 0.8 6.12 x 10-8 6.36 0.9 4.9 x 10-8 x 0.9 6.12 x 10-8 7.16 1 4.9 x 10-8 x 1.0 6.12 x 10-8 7.95 Medium Constantan Wire .40mm length formula resistance 0.1 4.9 x 10-8 x 0.1 1.26 x 10-7 ...

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... a metre stick to measure the wire at eye level for accuracy. The wire must be pulled tight and held into place while measuring to ensure the length is accurately measured. Current We need to keep the current the same throughout the experiment because we are not measuring the current. We are investigating the ... (volts, V) Amps (A) I will calculate this by using a calculator so I avoid any possible errors. Fair Test The only variable that I will be altering will be the length of the wire as this is the main variable. The other variables, I will keep controlled to make it a fair test. I w...

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... use, electronic transmission, relaying of television signals, and the need for communication in space all contributed to the emphasis placed on laser technology toward communications. The initial attraction to lasers for communications came from the fact that the amount of coherent information that an electromagnetic ... cornea within, using laser. For example Nearsightedness or myopia occurs when light rays entering the eye are focused in front of the retina instead of directly on it. Myopia is usually a result of the curvature of the cornea being too strong or the length of the eyebal...

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... is therefore equal to 1 joul per second. These units are important in discussing the maximum energy the laser is capable of generating. From the top, if the pulse has the rather long length of one second, energy in the pulse of one joule would be equivalent to a max power of ... one watt. when laser pulses are repetitive, the average power output of a laser(watts) is discussed. This being the product of ... and other applications. Aircraft builders also see the use of lasers systems. Distance and length Co2 lasers are used for optical radar transmitter. Also laser range finders for air...

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... is the job of the tracking system. The tracking system, as it plays the CD, has to continually move the laser outward. As the laser moves outward from the center of the disc, the bumps move past the laser faster -- this happens because the linear, or tangential, speed of the bumps is equal to the radius times the ... speed at which the disc is revolving (rpm). Therefore, as the laser moves outward, the spindle motor must slow the speed of the CD. That way, the bumps travel past the laser at a constant speed, and the data comes off the disc at a constant rate. A CD can store ... more da...

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... which lasers were thought to have application. Increasing telephone use, electronic transmission, relaying of television signals, and the need for communication in space all contributed to the emphasis placed on laser technology toward communications. The initial attraction to lasers for communications came from the fact that the amount of coherent information that an electromagnetic wave can carry if proportional to its ... Keratomileusis. This literally means, to shape the cornea within, using laser. For example Nearsightedness or myopia occurs when light rays entering the eye are foc...

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... area and apparently is consistent with the aftershock sequence, which is approximately 60 kilometers long and extends northeast of Kobe. Based on empirical data of earthquake magnitude versus surface fault length, a 9-kilometer-long surface rupture should yield only an Mw6.2 earthquake, whereas a 60-kilometer-long rupture should yield an Mw7.1 earthquake, which is more consistent with the observed ... business district had severe damage or collapsed. In general, such structures appeared to have been minimally engineered. In many cases, these damaged buildings contained relatively light...

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... quality sound and are the same size as a standard CD. These things allowed the DVD to overcome problems that plague other media types such as the laser disk and become a popular type of media. Because of its architecture, a DVD is able to hold enormous amounts of information. As with a C.D., ... DVD's use lasers to burn pits into a disk that are read by another laser and transferred into the computers language. The difference between a DVD and a CD lies microscopically on the disk itself. This internal design provides DVD with the ... a DVD are much smaller and closer together than the...

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... series of pits and flat areas. Reading these pits or flats denote 0's or 1's, the building blocks of binary language which the computer uses. A thin laser beam reads the pits or the flats while the disk is spinning. Light reflects from the flat surfaces, not the pits. So a photo detector reads ... not the only thing that does into creating a usable CD-ROM. Next, the clear disc is given a reflective coating so that it will reflect the laser light the drive shines on it. Silver is used as a basis in this coating because it spreads out evenly, coating all pits and landing uniformly. ... do...

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... weight instead of one heavier weight. I thought that the weight might not be evenly distributed from the bottom of the string, resulting in a diagonal oscillation. I tested the pendulum with several weights and found no visible problems in the swing. Overall, the pendulum seemed to work quite well ... factors (force, drop and angle). She does not mention how it affects frequency (faster or slower). 3. She mixes variable by adjusting both length and weight and does not actually state conclusions. 4. Subject mentions angle. I allow her to proceed with adding a new factor. She demonstrates ...

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... wefts, one and then another, right across the loom. Since the weaver avoids long vertical lines in the pattern (to avoid long slits), designs are composed primarily of diagonal and horizontal elements. Intersecting diagonal pattern lines are also avoided, to produce strong pieces. Tapestry weft yarns need not always be horizontal. They can be pushed about as the weaver wishes to easily ... sometimes produced weftless soumak bags, with no intervening ground wefts. Variations in soulmak structures occur when the direction of wrapping is altered, or when the weaver outlines their design in...

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... other serious medical problems, or if the cancer is widespread, other types of surgery can be used to relieve some symptoms. For example, laser surgery can be used to relieve blockage of airways that may cause pneumonia or shortness of breath. Some patients with lung cancers that have ... Therefore, careful attention must be given to avoiding or minimizing side effects which depend on the type of drugs, the amount taken, and the length of treatment. Temporary side effects might include nausea and vomiting, loss of appetite, loss of hair, and mouth sores. Because chemotherapy can damage ...

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... fibre, which is used to transmit one signal per fibre. This type is mostly used in telephones and cable TV. It has small cores and transmits infrared laser light. The second type, called multi-mode fibre is used to transmit many signals per fibre and can therefore be used in computer networks and local area ... fibre optics work? A real fibre optic cable is made out of glass that is incredibly pure so that light can still make it through no matter what the length of the cable is. This glass is drawn into a very thin strand and is then coated in two layers of plastic. This coating is done...

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... omnipresent in the construction of the building. Parts can be expressed as x = 2y + 1, so there are 17 columns on the side and 8 in the front, and the ratio of the length of the building to the width is 9:4. The floor curves upward in the center of the facade to drain off rain water and to deflect the appearance of sagging at ... medieval art they can be significantly decorated. Psalter: a book containing the Psalms, or sacred sung poems, of the Bible Reliquary: a vessel for holding a sacred relic Rib vault: a vault in which diagonal arches form rib-like patterns. These arches partially...

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... of the painting, a young ballerina wearing a yellow bow on her tutu performs an arabesque on pointe, while two other dancers practice their port de bras (arm positioning) in the floor-length mirror behind her. The mirror seems to open up the composition. An older female chaperone wearing a straw hat sits in a chair reading (possibly a newspaper) in the foreground. Two dancers are ... 's body is cut off at the edge of the painting. The entire center portion of this painting is deliberately left empty. The clusters of dancers are also on diagonals. A faint diagonal line is even visible in ...

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... 's law. Gas discharges, vacuum tubes, semiconductors and what are termed onedimensional conductors (e.g.a linear polyene chain) generally all deviate from Ohm's law. In Ohmic material the resistance is proportional to the length l of the sample and inversely proportional to the sample cross-section A: R = l A (2) where is the resistivity measured in cm (in SI units m). Its inverse =-1 is the conductivity. ... for describing quantitatively a conductor, semiconductor or insulator built up of a linear chain of atoms such as in polyacetylene. Assume a row of N atoms separated by a distance d...

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... 's Boat Ashore at Calas (1851), simple romantic elements comprise the piece: diagonals and smoke. A main diagonal line emphasizes the downward slope of a shore lined with beached boats resting upon the sand. A challenging inferior diagonal line of a small group of people and their dinghies cross the main diagonal flow. The two lines of tension resolve at the lower center of the composition highlighting the ... cloud formation is horizontally stable, thus emphasizing the calmness of the sea. Baron Antoine-Jean Gros" Murat Defeating the Turkish Army (1805) is a composition which presents a...

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... ways. In this paper you will learn about the life of William D. Phillips, and his major achievements. You will learn how they cooled and trapped a laser's atoms, to make it possible to shoot one. William D. Phillips was born November 5th, 1948, in the town of Wilkes-Barre in the state of ... were "commercially"(4) available to own, eventually a few made their way to Phillip's lab. Because of Bills interest in lasers he decided to study the collisions of laser-excited atoms. Excitedly, he wrote up both experiments for his thesis, which he defended in 1976. After his write-ups, he continu...

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... When this happens a small amount of light is created in a quarts tube filled with typically argon gas. The argon gas is what gives a laser its red color in a laser pointer. This tiny sparks makes light, which is in the form of ions. Ions make up all light in the universe. These ions scatter ... to the two sides of the quarts tube. Next the ion enters in an atom of the argon gas, which is the start of the actual laser existence. When the ion enters the atom it picks up a second ion and exits the atom traveling in perfect sink wavelength making an increased strength ... like the second i...

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... , which measures about 0.5 microns (millionths of a meter) across and 5 km long. To read this information, a CD player passes a laser beam over the track. When the laser passes over a flat area on the track, the beam is reflected directly to an optical sensor on the laser assembly. The CD player interprets this as a 1. However, when the beam passes over a bump, the light is bounced ... light can't pass through. This is the job of the CD-burner. The CD burner has a moving laser assembly, just like an ordinary CD player, but in addition to the standard "read laser," it has a "write laser."...

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... ). This was right about the time of composer Henry Purcell. The jack mechanism plucked the strings just as in the virginal, but the wing shape permitted longer strings. This longer length of the stirrings increased the volume, and expanded the range of the instrument to as much as five octaves. Recognized as early as the fifteenth century, the harpsichord form, where ... struck back towards the strings and returned forward. It was designed in 1787 by John Landreth, and built and implemented by Englishman William Southwell in 1798. Another major development was diagonal stringing. This en...

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... Cassatt. Mary in particular, who became great friends with Degas and continued being great friends until his death. The painting "The Dancing Class" is one of Degas many dancers on a diagonal paintings. This painting includes many different elements for many different purposes. One of these elements is line, on which he has created his floorboards on ... a diagonal, hence dancers on a diagonal. Another element featured in this painting is the tone of the colours. He has very effectively made the painting look as though there actually is sunlight streaming in from windows ... . The main...

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... is time to burn the CD, also known as to copy onto the CD. When you burn a CD what is actually happening is there is a laser inside of the machine that will copy the music. The laser starts at the beginning of the blank CD and moves at the same pace in a spinning motion around the entire disk until all of the ... tracks are recorded. This laser also known as the "write laser" alters the surface of the CD where as the "read laser" does not. The write laser is much more powerful than the read laser, because it has to alter the disk by "burning", as the write laser does not it only has to ...

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... had on Degas. This technology gave Degas a new way of point of view for his creativity. He was obsessed with movements. In "The Laundress", another sign of modernism is the diagonal line of the table. That line seems like it makes our eyes move in circular motion. It reminds me of the style used in Japanese paintings of the Edo period ... (and the traditionalist movement that carried on the legacy of the old masters) and elevates the contemporary. Also in these paintings Degas used diagonal lines, an indication of influence from Japanese paintings. In the "Nude Wiping Her Foot", diagona...

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