Computer terminal

In colored cathode ray tubes (CRTs), such as those used in televisions and computer terminals, three electron gun beams are focused on three different sets of phosphor dots on the front face of the tube. The dots are produced by using a compHcated photoHthography process. The phosphor dots are produced by settling the three different phosphors, each of which emits one of the primary saturated colors, red, green, or blue. Each phosphor is deposited separately and the three dots in each set are closely spaced so that the three primary colors are not resolved at normal viewing distances. Instead the viewer has the impression that there is only one color, the color achieved when the three primary colors are added together. 

The blue-emitting component of most television screens and computer terminals is another sulfide, ZnS Ag,Al. Although rare-earth activated blue-emitting phosphors ZnS Tm " and Sr (P0 2d-Eu (30) have also been evaluated for this appHcation, the search for a good blue phosphor that does not saturate at high current densities and maintains weU continues. 

Cathodoluminescence (CL), i.e., the emission of light as the result of electron-beam bombardment, was first reported in the middle of the nineteenth century in experiments in evacuated glass tubes. The tubes were found to emit light when an electron beam (cathode ray) struck the glass, and subsequendy this phenomenon led to the discovery of the electron. Currendy, cathodoluminescence is widely used in cathode-ray tube-based (CRT) instruments (e.g., oscilloscopes, television and computer terminals) and in electron microscope fluorescent screens. With the developments of electron microscopy techniques (see the articles on SEM, STEM and TEM) in the last several decades, CL microscopy and spectroscopy have emerged as powerfirl tools for the microcharacterization of the electronic propenies of luminescent materials, attaining spatial resolutions on the order of 1 pm and less. Major applications of CL analysis techniques include ... 

Changes in room use Is there a need for additional ventilation (supply and/or exhaust) due to increased occupant population or new activities within any area of the building Have new items of equipment (non-HVAQ been provided with local exhaust where needed Look for unusual types or quantities of equipment such as copy machines or computer terminals. 

Industrial process furnaces and ovens Mechanical powertransmission equipment, n.e.c. General industrial machinery and equipment, n.e.c. Electronic computers Computer storage devices Computer terminals Computer peripheral equipment, n.e.c. Calculating and accounting machines, except electronic computers Office machines, n.e.c. ... 

In displacement ventilation systems air is supplied to the room at low velocity, with a volume flow rate near the floor, and is extracted near the ceiling. The temperature of the supplied air is slightly lower than that of the room. Air is heated by the objects in the room, e.g., computer terminals and photocopying machines, and it rises due to buoyancy. 

NPRDS data are available to users, either through annual summary reports (to resume publication in the coming year) or through direct on-line data base access from a computer terminal. Special reports and listings are available through specific requests for extraction or data analysis. 

In 1995 an estimated 43 million PCs and computer terminals were used in commercial buildings. More than half of the 4.6 million buildings in the... 

United States had at least one PC or computer terminal. The more PCs and computer terminals used m a given building, the greater the impact on the building s energy consumption. The proliferation of personal computers, printers, copiers, and other types of plug loads is the main cause of the rise in energy intensity in recent years. 

Although the manufacturing sector continued its decline in the production of energy-intensive products, between 1986 and 1997 the service sector continued to grow. Not only did the commercial building stock increase, but the use of office equipment—from computers to copy machines—has grown rapidly. In just three years, between 1992 and 1995, the number of personal computers and computer terminals m commercial buildings increased from 29.8 million to 43 million (45%). 

Each simulation, done in real time at a computer terminal, takes but a moment to complete. It is thus quite practical to vary in turn each of the starting conditions and rate constants for different time ranges. This procedure allows the investigator to assess how important the variation of one parameter is in determining the concentration of each species. (This is a sensitivity analysis.)... 

The structures shown in Figure A.l are those received by ordinary computer terminals. Better looking structures, more like those printed in books, are obtained with certain types of terminals. The system always asks the user to specify which type of terminal is being used. 

FIGURE 8.2 Example of a flowsheet generated by computer-aided process synthesis, as would be seen on the screen of a computer terminal. The column on the left side of the figure shows options available in the particular design program being run. Courtesy, Peter Piela, Carnegie-Mel Ion University. 

There is more to a laboratory than work benches and the instruments mounted on them. Free-standing equipment must also be considered. This includes refrigerators, safety storage cabinets for chemicals, safety shower, desk space, typewriter stand or computer terminal, or any other equipment that is not bench-mounted. File cabinets, which are real space-robbers, must not be forgotten. In one laboratory, much space was saved by placing two-drawer file cabinets beneath the large table used for sorting samples. 

Another personal data base In this department contains the acquisition dates and maintenance records of all computer terminals and printers in the research center. Since this equipment moves around the building, these records have made it much easier to decide If a particular unit is in warranty or Is having a recurring service problem. 

This remains a goal for the future. However, many groups are working on computer systems that will provide the tools needed to perform true design of new chemicals FIRST at the computer terminal. 

A computerized laboratory can utilize a software package called a laboratory information and management system (LIMS) to carry out or control all of these requirements provided that computerized instrumentation, computer terminals, printers and plotters, disk drives etc. are linked together in a local... 

Our laboratory data processing system is known as STRIDE (System to Retrieve Information from Drug Evidence). It is now in its third year of operation. In 1974, we will be installing in each laboratory computer terminals connected to the main computer in Washington. Every piece of evidence analyzed is entered into the system. The type of information includes the subject s name where the purchase or seizure was made the amount of money expended the suspected drug what the drug was found to bfe the purity of the drug and what excipients and adulterants were present. 

Benzene ETS, solvents, paints, stains, fax machines, computer terminals, printers, water-based adhesives, carpets, plastics, synthetic fibres. 12 1... 

Trichloroethylene Solvents, dry-cleaned fabrics, printing inks, paints, varnishes, adhesives, fax machines, computer terminals and printers, correction pen fluids, paint removers, spot removers. 28 2A... 

Tetrachloroethylene Dry-cleaned fabrics, spoftextile cleaners, fax machines, computer terminals and printers 27 2A... 

Any location that has a connection to the SCADA network is a target, especially unmanned or unguarded remote sites. Conduct a physical security survey and inventory access points at each facility that has a connection to the SCADA system. Identify and assess any source of information including remote telephone/ computer network/fiber optic cables that could be tapped radio and microwave links that are exploitable computer terminals that could be accessed and wireless local area network access points. Identify and eliminate single points of failure. The security of the site must be adequate to detect or prevent unauthorized access. Do not allow live network access points at remote, unguarded sites simply for convenience. 

Biometric security systems use biometric technology combined with some type of locking mechanism to control access to specific assets. In order to access an asset controlled by a biometric security system, an individual s biometric trait must be matched with an existing profile stored in a database. If there is a match between the two, the locking mechanism (which could be a physical lock, such as at a doorway an electronic lock, such as at a computer terminal or some other type of lock) is disengaged, and the individual is given access to the asset. 

The distributed control system (DCS) hardware areas are often referred to as "process computer rooms." I/O Rooms contain the incoming and outgoing wiring, cables and data highway links, and often small transformers and other related electrical equipment. Often, additional space is needed for a master process engineering computer terminal/work station for process control system changes and for critical safety instrumented systems (SIS) for interlocks and emergency shutdowns. 

The only equipment that is required to establish access to a computer network, is a telephone-coupled computer terminal. Typewriter terminals are becoming very common and are also becoming relatively inexpensive. Such a terminal can be purchased from a variety of manufacturers for between 1,000 and 3,000 and in general. 

Angstrom is collected at the edge. A calibration chart mapping resolution in Angstroms at the edge of the detector with distance should be readily available to the operator, either in paper form or on the computer terminal. Collect three oscillations of 1°. If the crystal habit looks as if it is either monoclinic, orthorhombic, or tetragonal (i.e. the crystal looks like a small shoebox, a rectilinear... 

An already substantial and rapidly growing market for CRT phosphors and tubes is in the area of data displays, both alphanumeric and graphic, e.g., computer terminals and word processors. In spite of dramatic advances in other technologies, CRT s are still the most cost effective way to present information, and very likely always will be. Most data display tubes do not use rare earth phosphors because of their high cost, rare earth phosphors find use only when there is a compelling need for their special properties. At the present time, this is limited to the use of Eu3+ reds in tricolor tubes that use the same shadow mask principle as conventional color TV. 

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