Electronic windows

The UW detector uses Sharp low beta anticoincidence electronics and scalers (low beta I) with voltage sensitive preamplifiers (Sharp is a division of Beckman Instrument Co.). The electronic window selected by a pulse generator is 0.75-100 mv. input for the anticoincidence channel and 0.5-oo mv. for the guard channel. The discriminators were set up for use only in natural radiocarbon measurements. 

Irradiation Cells and Calorimeters. The cell used for gas phase irradiations with the Febetron was made of stainless steel. The gas volume was a cylinder 4.0 cm. in diameter and 3.0 cm. deep behind a 0.0127 cm. stainless steel electron window. The electron window was welded around the edge of the cell. Welded to the rear of the cell was a small filling tube with a stainless steel Hoke vacuum valve. The whole assembly could be pumped and baked. Gases were frozen into the filling tube volume with liquid nitrogen and allowed to expand into the cell on warming. 

Discrete batch electronic windows, auto no known semiconductors. 

This area is limited by the echo of the entrance window in front, the noise of the electronic equipment and the accuracy of the digitizer or the distance between the container walls. 

Figure Bl.3.5. Four WMEL diagrams for fiilly resonant Raman scattering (RRS). Diagrams (a) and (b) both have doorway stage rr(A.j2 ) (Figure B 1.3.4(a)), in which a vibrational coherence is created in the ground electronic state, g. For the window event in (a), field 1 promotes the bra from the ground electronic state, g, to...

In the microwave region tunable monochromatic radiation is produced by klystrons, each one being tunable over a relatively small frequency range, or a backward wave oscillator, tunable over a much larger range. Both are electronic devices. Absorption experiments are usually carried out in the gas phase, and mica windows, which transmit in this region, are placed on either end of the absorption cell, which may be several metres in length. Stark... 

Auger electron spectrum, 320ff windows for infrared, 62... 

Eig. 4. Transmission profile for a siUca-based glass fiber. Region A represents electronic transitions B, the transmission window and C, molecular vibrations. Point LL is the lowest loss observed in an optical fiber. Absorption profiles for (-) OH and ( ) Fe are also shown. See text. 

Applications. The applications sought for these polymers include composites, stmctural plastics, electronics/circuit boards, aircraft/spacecraft coatings, seals, dental and medical prosthetics, and laser window adhesives. However, other than the early commercialization by Du Pont of the NR-150 B material, Httie development has occurred. These polymers are quite expensive ( 110 to 2200 per kg for monomers alone). 

ISI is available in hard copy and electronically at EPA s headquarters and regional Hbraries, and through the National Technical Information Service (NTIS). The electronic form may be installed on IBM PC-compatible computers or placed on local area networks, and mn under Microsoft WINDOWS or WordPerfect s Library program. The Macintosh version is no longer available. The 1993 update will include the ISI hardcopy, PC disks, and the PC system user manual. EPA also pubHshes ACCESS EPA, which provides sources of information, databases, and pubHcations within the EPA. Chapter 5 of that pubhcation includes important environmental databases in air and soHd waste, pesticides and toxic substances, water, and cross-program (110). EPA also provides databases accessible through EPA Hbraries, which describe the private EPA and commercial databases available to Hbrary users (111). 

Initially, DADC polymers were used in military aircraft for windows of fuel and deicer-fluid gauges and in glass-fiber laminates for wing reinforcements of B-17 bombers. Usage in impact-resistant, lightweight eyewear lenses has grown rapidly and is now the principal appHcation. Other uses include safety shields, filters for photographic and electronic equipment, transparent enclosures, equipment for office, laboratory, and hospital use, and for detection of nuclear radiation. 

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