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Scaling of thin-film Nd₁.₈₅Ce₀.₁₅CuO[subscript 4-y] resistivity-current isotherms at low fields: Implications for vortex phase transitions and universality

Creator:: Roberts, J. M., Brown, Brandon, Tate, Janet, Xi, X. X., and Mao, S. N.
Abstract:: We have investigated a second-order phase transition of the vortex lattice in thin-film Nd₁.₈₅Ce₀.₁₅CuO[subscript 4-y] from 1 mT to 1 T applied magnetic fields. The dc resistivity-current density data for each field exhibit critical scaling consistent with a second-order vortex-liquid to vortex-solid phase transition. The high-field data support the vortex-glass...
Resource Type:: Article
Full Text:: described previously. The NCCO 0163-1829/95/51(21}/15281(5}/$06.00 1995 The American Physical Society

Scaling of voltage-current characteristics of thin-film Y-Ba-Cu-O at low magnetic fields

Creator:: Roberts, J. M., Brown, Brandon, Hermann, B. A., Tate, J., and Tate, Janet
Abstract:: We have measured voltage-current characteristics for YBa₂Cu₃O₇ thin films in magnetic fields from 5 T to ambient, including some in the millitesla range. In all cases, the resistivity —current density isotherms can be separated into two classes: those which exhibit upward curvature, and have constant resistivity at low currents, and...
Resource Type:: Article
Full Text:: Society 49 SCALING OF VOLTAGE-CURRENT CHARACTERISTICS OF. . . 6891 and find that the data scale at all

Evidence for three-dimensional flux creep in thin-film Bi₂Sr₂CaCu₂O₈₊δ

Creator:: Karapetrov, Goran and Tate, Janet
Abstract:: We have measured sweep-rate-dependent magnetization hysteresis curves of thin-film Bi₂Sr₂CaCu₂O[subscript 8+δ] using a Hall probe magnetometer in an unconventional geometry. We find a structure in the response well below the three-dimensional to two-dimensional crossover field. The observed strong enhancement of the perpendicular field component’s creep rate in the presence of...
Resource Type:: Article
Full Text:: Physical Society 52 EVIDENCE FOR THREE-DIMENSIONAL FLUX CREEP IN. . . 3777 The experiments testing the

Rocky intertidal oceanography: an association between community structure and nearshore phytoplankton concentration

Creator:: Menge, Bruce A., Daley, Bryon A., Wheeler, Patricia A., and Strub, P. Ted
Abstract:: On Oregon coastal rocky shores, filter‐feeders were relatively abundant and macrophytes were relatively scarce at Strawberry Hill, whereas opposite abundance patterns occurred at Boiler Bay. To determine whether nearshore oceanographic differences were associated with these patterns, we made shore‐based measurements of nutrient and Chl a concentrations. We used a three‐level...
Resource Type:: Article
Full Text:: phytoplankton concentration. 1hl1110/. Ocrmlogr.. 42( I ), 1997, 57-M-i 0 1997, by the American Society of

The role of dissolved organic matter release in the productivity of the oligotrophic North Pacific Ocean

Creator:: Karl, David M., Hebel, Dale V., Björkman, K., and Letelier, Ricardo M.
Abstract:: Based on a long-term set of observations and measurements at a station in the subtropical North Pacific Ocean, it now appears that contemporaneous rates of primary production in low-nutrient open ocean regions and perhaps in the ocean as a whole may be greater than had been considered in field studies...
Resource Type:: Article
Full Text:: . The role of dissolved organic matter release in the productivity of the oligotrophic North Pacific

Nitrogen cycling in the Barents Sea - seasonal dynamics of new and regenerated production in the marginal ice zone

Creator:: Kristiansen, Svein, Farbrot, Tove, and Wheeler, Patricia A.
Abstract:: The uptake rates of nitrate, ammonium, and urea were measured with a ¹⁵N technique during seven cruises in the marginal ice zone (MIZ) in the Barents Sea in 1984–1988. The results from all the cruises were pooled to obtain means for the prebloom, bloom, transition, and postbloom periods. New production—nitrate...
Resource Type:: Article
Full Text:: zone Limnol. Oceanogr., 39(7), 1994, 1630-1642 0 1994, by the American Society of Limnology and

Nitrate uptake rates in a coastal upwelling regime: a comparison of PN-specific, absolute, and Chl a-specific rates

Creator:: Dickson, Mary-Lynn and Wheeler, Patricia A.
Abstract:: PN-specific, absolute, and Chl a-specific nitrate uptake rates were measured during two upwelling seasons and one winter off Oregon. Although PN-specific and absolute uptake rates showed no dependence on nitrate concentration, Michaelis-Menten kinetics applied when the uptake rates were normalized to Chl a. Chl a-specific nitrate uptake rates were saturated...
Resource Type:: Article
Full Text:: Limnol. Oceanogr., 40(3), 1995, 533-543 0 1995, by the American Society of Limnology and Oceanography

Chlorophyll a concentrations in the North Pacific: does a latitudinal gradient exist?

Creator:: Dickson, Mary-Lynn and Wheeler, Patricia A.
Abstract:: Chlorophyll a concentrations were measured as a function of depth from 28 to 48°N along 152°W in March 1991 with Whatman GF/F and 0.2‐µm Nuclepore filters. Surface Chl a concentrations measured with 0.2‐µm Nuclepore filters were up to fourfold higher than those measured with Whatman GF/F filters. The largest difference...
Resource Type:: Article
Full Text:: ). 1993, 1813-1818 (0 1993, by the Ameruzan Society of Limnology and Oceanography. Inc Chlorophyll a

Temperature-dependent absorption of water in the red and near-infrared portions of the spectrum

Creator:: Pegau, W. S. and Zaneveld, J. Ronald
Abstract:: We looked at the influence of temperature and salinity on the absorption coefficient of water with emphasis on the red and near-IR portions of the spectrum. The absorption coefficient of pure water was found to have a strong dependence on temperature and little dependence on salinity near the harmonics of...
Resource Type:: Article
Full Text:: ., 38(l), 1993, 188-192 0 1993, by the American Society of Limnology and Oceanography, Inc

A three-layered sphere model of the optical properties of phytoplankton

Creator:: Kitchen, James C. and Zaneveld, J. Ronald
Abstract:: Theoretical scattering computations are performed on a phytoplankton model consisting of three concentric spheres. The outer sphere represents the wall, membrane, or frustule and is assigned a relatively high index of refraction with no absorption. The middle layer represents the chloroplasts and is assigned a relatively low index of refraction...
Resource Type:: Article
Full Text:: 1992, by the American Society of Limnology and Oceanography, Inc. A three-layered sphere model of the

ScholarsArchive@OSU

Scaling of thin-film Nd₁.₈₅Ce₀.₁₅CuO[subscript 4-y] resistivity-current isotherms at low fields: Implications for vortex phase transitions and universality

Scaling of voltage-current characteristics of thin-film Y-Ba-Cu-O at low magnetic fields

Evidence for three-dimensional flux creep in thin-film Bi₂Sr₂CaCu₂O₈₊δ

Rocky intertidal oceanography: an association between community structure and nearshore phytoplankton concentration

The role of dissolved organic matter release in the productivity of the oligotrophic North Pacific Ocean

Nitrogen cycling in the Barents Sea - seasonal dynamics of new and regenerated production in the marginal ice zone

Nitrate uptake rates in a coastal upwelling regime: a comparison of PN-specific, absolute, and Chl a-specific rates

Chlorophyll a concentrations in the North Pacific: does a latitudinal gradient exist?

Temperature-dependent absorption of water in the red and near-infrared portions of the spectrum

A three-layered sphere model of the optical properties of phytoplankton

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