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Figures (6)

Fig. 1
Fig. 1

Chopper forms pulses from a beam of xenon-arc light. The chopper is only necessary to avoid the buildup of laser-quenching species in the sealed tube. The perfluoropropyliodide lasing medium can function at temperatures of about 670 K, which reduces cooling requirements in space.

Fig. 2
Fig. 2

In the proposed solution-mining process, the hot brine could be pumped down one well and recovered at one or more other wells. The emerging brine is rich in the desired mineral (in this case, Na2CO3). This brine is evaporated in solar ponds to recover the mineral.

Fig. 3
Fig. 3

Synthesis and copolymerization of compound 1 are illustrated schematically, with ingredients.

Fig. 4
Fig. 4

Vacuum hold-down fixtures hold photovoltaic solar cells during assembly into an array. The tab-attachment fixture holds a single cell and interconnecting tabs during heat-lamp soldering. The array-layout fixture has a computer-scribed layout template and holds the cells (with attached tabs) while they are being placed in position and while they are being transferred to the array-interconnection fixture, which holds the cells during the final soldering step. A group of heat lamps on a trolley passes slowly over the interconnection fixture to heat the cells to soldering temperature.

Fig. 5
Fig. 5

Potting material is added to the two inside faces of the solar-cell assembly before they are sandwiched and cured. Two different assembly configurations are shown.

Fig. 6
Fig. 6

Negative memory in a light valve is an undershoot of the output-signal envelope when the light level decreases abruptly.

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