Computed scanner

The use of conventional photographic systems for data acquisition, printing and archiving results of planar chromatography [401] has now largely been superseded by video documentation systems. A sample method for documentation of TLC plates has been described by a combination of computer, scanner, and digital colour thermal printer resulting in a very... 

Use a standard font that s easily readable by a computer scanner. 

Information about formatting your resume so that it s compatible with computer scanners and applicant-tracking software was offered in Chapter 3. Some of the key formatting points included ... 

Once you choose your resume paper, select an ink color. Avoid wild colors and mixing multiple colors. Black ink is the most popular and most traditional color. If you choose to print your resume using an alternate color ink, make sure your selection is professional looking. Brown or burgundy are good alternatives. Make sure the ink color and the paper you choose don t clash. Also, make sure the text is easily readable both to the human eye and to computer scanners. If faxing your resume to employers, your paper and ink color selections should be white paper with black ink. If your resume is difficult to read, people won t read it. 

The force (F) required to cause failure of the welded specimens in shear was measured on an Instron Model 4206 Universal testing machine at a cross-head speed of 5 mm/min. The stress at break was normalized by the weld cross-sectional area. The weld length was fixed at 15nun and the width was measured using a calibrated computer scanner. It is important to note that, nnlike many other welding techniques, the weld width W) is a function of LTW power, material properties and part thickness. It therefore needs to be measured for each weld. 

Cohen, G. and F.A. DiBianca, The use of contrast-detail-dose evaluation of image quality in a computed tomographic scanner. Journal of Computer Assisted Tomography, 1979. 3(2) p. 189-195. 

X- and Gamma-Ray Computed Tomography Scanners for Industrial Applications. 

Various computed tomography CT- scanners for industrial applications have been designed and constructed) They use as radiation sources X-ray tubes or gamma emitting radioisotopes and as detectors NaI(Tl)-scintillators for gamma rays and image intensifiers for X-rays. 

The P-scan System 4 can be configured in many ways, dependent on the application. Figure 1 shows a basic system configuration. The P-scan processor (PSP-4) controls the scanner and the water pump. Scarmer operation on site is performed from the remote control unit, as an alternative to the control from the computer. The PSP-4 also includes the ultrasonic system. 

The data are transmitted from the front end processor to the computer in digital form over an ethemet link. The data consist of ultrasonic data, either raw RF A-scans or data processed by the digital signal processor in the PSP-4. In addition to the ultrasonic data, scanner coordinates are transmitted over the ethemet link. 

The Master Module (Figure 2, a) controls both the communications in the local network and the communieation between the network and the base station (a Scanner Master Controller or a FORCE Institute PSP-3 or PSP-4 ultrasonic acquisition unit). The communication between the base station and computer (PC with Windows 95 or Unix-workstation) containing the scanner control software runs on a standard ethemet connection. 

The system also consists of a LCD-screen located nere the object to be scanned. This screen is a slave to the one on the acqusition computer and consequently shows the same image. The purpose of this screen is to help the scanner technician to acheive a full coverage of the area to be scanned. 

Consumer Products. Laser-based products have emerged from the laboratories and become familiar products used by many millions of people in everyday circumstances. Examples include the supermarket scaimer, the laser printer, and the compact disk. The supermarket scanner has become a familiar fixture at the point of sale in stores. The beam from a laser is scaimed across the bar-code marking that identifies a product, and the pattern of varying reflected light intensity is detected and interpreted by a computer to identify the product. Then the information is printed on the sales sHp. The use of the scanner can speed checkout from places like supermarkets. The scanners have usually been helium—neon lasers, but visible semiconductor lasers may take an impact in this appHcation. 

Keyboards are the most widely used input devices, but optical scanners and digital pads (for computer-aided design) are some additional input devices. Input may also be from files stored on a disk or tape. 

The distance of each reflection from the center of the pattern is a function of the fiber-to-film distance, as well as the unit-cell dimensions. Therefore, by measuring the positions of the reflections, it is possible to determine the unit-cell dimensions and, subsequently, index (or assign Miller indices to) all the reflections. Their intensities are measured with a microdensitometer or digitized with a scanner and then processed.8-10 After applying appropriate geometrical corrections for Lorentz and polarization effects, the observed structure amplitudes are computed. This experimental X-ray data set is crucial for the determination and refinement of molecular and packing models, and also for the adjudication of alternatives. 

Bar code scanners, for example, exploit the directionality of a laser beam. The laser light reflects more strongly from white stripes than from black. Because of the directionality of the laser beam, the reflected laser beam faithfully mirrors the pattern of the bar code. A sensor reads these variations and converts the light pattern into an eiectronic representation of the bar code. The sensor transmits the electronic representation to a computer. 

Finally, newer scanners are being developed with both PET and another modality, such as computed tomography (X-ray CT), where a subject would be scanned first with X-ray CT for anatomy and for attenuation correction, and then imaged for their PET or SPECT measurements. 

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