Selective erase

The Computer. AXIS is written in FORTRAN and runs on a GEC 4000 series multi-user mini computer equipped with a Graphics Option Controller (GOC) model 5250, manufactured by Sigma Electronic Systems Ltd. This device converts an alphanumeric visual display unit into a graphics terminal, allowing independent use of the alphanumeric and graphics screens. In addition, it provides cursor handling facilities and the ability to selectively erase part of the screen. All of these features are utilised by AXIS. 

CAMSEQ/M was developed around a Tektronix 4051 Microcomputer Graphics System. The hardware required includes the basic 4051 microcomputer with a minimum of 16k bytes of memory (32k is recommended), a "joystick" graphical input device, and a matrix function package (in a read-only memory firmware pack). A vastly more versatile system requires the addition of a file manager/ disk system. In order to communicate with the NIH-EPA-CIS or another "host" computer, a communications interface is necessary. The total hardware cost is approximately 17,000. Table II outlines the required hardware. The 4051 utilizes a direct view storage display which does not employ a selective erase feature. Therefore, it is necessary to replot the screen frequently in order to remove unwanted information. This handicap is the price one must pay for low cost, but quite sophisticated computer graphics features, and does not pose any major problems in CAMSEQ/M. 

In this paper a laser beam addressed liquid-crystal light valve is described. Its writing speed is limited by the available laser power and by the laser scanning system, but it does have selective erase capability. This feature, which allows local erase and update of information on the screen, is important in large storage displays and is not available with present storage CRT s. 

As can be seen from the figure, grey scale writing is possible by varying the amount of energy per spot (power level or pulse length). A different method which uses constant energy and is related to the selective erase process, is described in the next section. 

The selective erase process is shown in the lower curve of Fig. 7. Here the cell is subjected to a field and a previously written area is re-scanned by the laser beam at the same energy density. As the heated area cools the effect of the field is to discourage the creation of the focal-conic texture and to promote homeotropic alignment. At 120V a selective erase process exists for this cell because background information (upper curve) is virtually unaffected whereas the CR of the selected (re-scanned) area is reduced to an acceptably low level. The width of a practical selective erase window" will depend on the acceptable values of CR and is affected by all of the cell variables mentioned in the previous section. 

The underline cursor is selectively erased and rewritten each time a character is entered. The laser, which has its heat sink maintained at 10 C by a thermoelectric cooler, emits about 15 mW GW. A pair of f/2 lenses collects and focuses about 3 mW into a 3x15 ym beam at the LC cell. Overlapping spots are written on 10 ym centers over a field of 7 mm diameter. The laser pulse time is 120 ysec which implies an energy of 0.36 yJ per spot. This is... 

To erase information by the transition amorphous — crystalline, the amorphous phase of the selected area must be crystallized by annealing. This is effected by illumination with a low power laser beam (6—15 mW, compared to 15—50 mW for writing/melting), thus crystallizing the area. This crystallization temperature is above the glass-transition point, but below the melting point of the material concerned (Eig. 15, Erase). 

To minimize the risk of data loss because of power failure or other reasons, the Mossbauer data are copied to a nonvolatile EEPROM (Electrically Erasable Programmable Read-Only Memory) every 9 minutes (software selectable). As the size of the EEPROM is smaller than the SRAM, the EEPROM can accumulate only up to ten Mossbauer spectra as a subset of the data from the SRAM. These spectra are obtained from the SRAM according to a pre-defined summation strategy. 

Selectivity of this kind erases any fears of systemic hypotension and hypoxemia, which is usually associated with other NO donors applied to such model systems. Similar attempts at selective vasodilation have been reported by other groups [94, 95] and further work by Brilli et al. [96] in this field shows how aerosolized NONOates, in combination with surfactant, improve both oxygenation and PVRI in porcine lung... 

Be sure to write your answers for Section I on the separate answer sheet. Use the test booklet for your scratchwork or notes, but remember that no credit will be given for work, notes, or answers written only in the test booklet. Once you have selected an answer, blacken thoroughly the corresponding circle on the answer sheet. To change an answer, erase your previous mark completely, and then record your new answer. Mark only one answer for each question. 

Clean the cuvette with a cotton swab and fill it about three-fourths full with the unknown dye solution. Place the cuvette in the colorimeter and close the lid. From the MAIN MENU, select COLLECT DATA (do not select SET UP PROBES as this will erase your data lists). Select MONITOR INPUT from the DATA COLLECTION MENU. Press ENTER to monitor the absorbance value of the colorimeter. After about 10-15 seconds, record the absorbance value and record it in your data table. 

Secondary population update. Efficiency scores are initially used to update the Pareto-archive. The current Pareto-archive is erased and a subset of the current working population that favours individuals with high efficiency score, i.e. low domination rank and high chromosome graph diversity, takes its place. Note that the size of the secondary population selected is limited by a user-supplied parameter. The secondary population mechanism has been designed specifically to preserve good solutions, non-dominated or dominated but substantially structurally unique, from all... 

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