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The Hg geochemistry of a geothermal stream, Steamboat Creek, Nevada: natural vs. anthropogenic influences (1998)

Lyons, W. B. ; Wayne, D. M. ; Warwick, J. J. ; [et al.]

Springer

Environmental geology 34 (1998), S. 143-150

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ISSN: 1432-0495

Keywords: Key words Mercury ; Gold mining ; Steamboat Creek ; Nevada

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract A series of water samples from Steamboat Creek, Nevada, was analyzed for total mercury concentrations. Concentrations from these waters were 40 to 60 times higher than the pristine mountain streams entering the creek. The major source of the mercury entering Steamboat Creek is probably from gold/silver processing that took place in the 1860s.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s002540050265

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Pyroelectrically induced optical emission from potassium titanyl phosphate crystals (1997)

Cooke, D. W. ; Bennett, B. L. ; Muenchausen, R. E. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 71 (1997), S. 1338-1340

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: We have observed optical scintillations and corresponding electric current pulses when uniformly heating potassium titanyl phosphate (KTP) crystals at 0.1–0.4 K/s over the temperature range 8–300 K. The scintillations correspond to molecular nitrogen emission occurring during the electrical breakdown of air near the crystal surface, and imply the existence of pyroelectrically induced peak electric fields at the crystal surface exceeding 30 kV/cm, which is ten times larger than dc electric fields reported to induce electrochromic (EC) damage in this material. Recent optical damage studies on KTP under high repetition rate, high average-power laser irradiation reveal an EC-like damage, implying the existence of an internal electric field arising during laser irradiation. Our observation of a sizable total pyroelectric response suggests one possible mechanism for the origin of these internal fields in KTP and other nonlinear optical materials. © 1997 American Institute of Physics.