Some considerations of hazards in the use of lasers for artistic displays /

Mode of access: Internet.

Guide for submission of information on lasers and products containing lasers pursuant to 21 CFR 1002.10 and 1002.12 /

Mode of access: Internet.

Lasers and masers: a continuing bibliography; a selection of annotated references to unclassified reports and journal articles introduced into the NASA information system during the period January, 1962-

Mode of access: Internet.

Optics and lasers : a compilation /

Cover title.

Prattsville Pumped Storage Project, No. 2729, New York : final environmental impact statement.

"Applicant: Power Authority of the State of New York."

Construction and use of special drawdown scales for predicting water-level changes throughout heavily pumped areas /

Mode of access: Internet.

The spacing of pumped wells /

Mode of access: Internet.

ABC's of lasers and masers.

"cat no. BAB-1."

Transportability guidance : tube-launched, optically-tracked, wire-guided, heavy antitank/assault weapon system (TOW) : guided missile, surface attack, BGM-71-A (in shipping container) (FSN 1410-087-1521), launcher, tubular, guided missile, M220 (FSN 1440-179-4152), carrier, guided missile equipment ... truck ... training set ... shop equipment ... contact support ....

"September 1973."

Mapping water quality and substrate cover in optically complex coastal and reef waters: an integrated approach

Sustainable management of coastal and coral reef environments requires regular collection of accurate information on recognized ecosystem health indicators. Satellite image data and derived maps of water column and substrate biophysical properties provide an opportunity to develop baseline mapping and monitoring programs for coastal and coral reef ecosystem health indicators. A significant challenge for satellite image data in coastal and coral reef water bodies is the mixture of both clear and turbid waters. A new approach is presented in this paper to enable production of water quality and substrate cover type maps, linked to a field based coastal ecosystem health indicator monitoring program, for use in turbid to clear coastal and coral reef waters. An optimized optical domain method was applied to map selected water quality (Secchi depth, Kd PAR, tripton, CDOM) and substrate cover type (seagrass, algae, sand) parameters. The approach is demonstrated using commercially available Landsat 7 Enhanced Thematic Mapper image data over a coastal embayment exhibiting the range of substrate cover types and water quality conditions commonly found in sub-tropical and tropical coastal environments. Spatially extensive and quantitative maps of selected water quality and substrate cover parameters were produced for the study site. These map products were refined by interactions with management agencies to suit the information requirements of their monitoring and management programs. (c) 2004 Elsevier Ltd. All rights reserved.

Lasers - An effective artificial source of radiation for the cultivation of anoxygenic photosynthetic bacteria

The laser diode (LD) is a unique light source that can efficiently produce all radiant energy within the narrow wavelength range used most effectively by a photosynthetic microorganism. We have investigated the use of a single type of LID for the cultivation of the well-studied anoxygenic photosynthetic bacterium, Rhodobacter capsulatus (Rb. capsulatus). An array of vertical-cavity surface-emitting lasers (VCSELs) was driven with a current of 25 mA, and delivered radiation at 860 nm with 0.4 nm linewidth. The emitted light was found to be a suitable source of radiant energy for the cultivation of Rb. capsulatus. The dependence of growth rate on incident irradiance was quantified. Despite the unusual nearly monochromatic light source used in these experiments, no significant changes in the pigment composition and in the distribution of bacteriochlorophyll between LHII and LHI-RC were detected in bacterial cells transferred from incandescent light to laser light. We were also able to show that to achieve a given growth rate in a light-limited culture, the VCSEL required only 30% of the electricity needed by an incandescent bulb, which is of great significance for the potential use of laser-devices in biotechnological applications and photobioreactor construction. (c) 2006 Wiley Periodicals, Inc.