The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Heinz G Stefan - One of the best experts on this subject based on the ideXlab platform.
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stream temperature equilibrium temperature relationship
Water Resources Research, 2003Co-Authors: Travis Bogan, Omid Mohseni, Heinz G StefanAbstract:[1] Equilibrium temperature is the water temperature at which the sum of all heat fluxes through the water surface is zero. It can be calculated from weather data. Mean weekly stream temperature was found to be linearly related to mean weekly equilibrium temperature above 0°C. The slopes and intercepts of the linear relationship were used to identify effects of shading, sheltering, cold water inputs (groundwater, meltwater, and deep reservoir releases) and warm water inputs (wastewater, cooling water, and lake surface water). The linearity hypothesis was confirmed for data from 596 U.S. Geological Survey stream gaging stations in the eastern and central United States. For approximately 15% (89 of 596, NSC ≥ 0.90) of stream gaging stations, weekly equilibrium temperature was a good estimator of weekly stream temperature with zero wind sheltering and sun shading. With sheltering and shading the number rose to 26% (156 of 596). For these streams the heat exchange through the water surface has the most controlling effect on stream temperatures. For the remaining 74% of streams the relationship between weekly stream temperature and weekly equilibrium temperature was also linear, but its slope was significantly less than 1.0 (even after calibration for shading and sheltering), indicating that processes other than surface heat exchange have an influence. Cold water inflows were dominant for 8% (46 of 596) of stream gaging sites. Less than 5% of all stream gaging stations showed evidence of unnatural heat inputs. Fitting an equilibrium temperature linearly to recorded stream temperatures, e.g., at a weekly timescale, can be of use to project stream temperatures under different weather-climate scenarios or to identify both natural and anthropogenic heat and hydrologic inputs to streams.
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Stream temperature‐equilibrium temperature relationship
Water Resources Research, 2003Co-Authors: Travis Bogan, Omid Mohseni, Heinz G StefanAbstract:[1] Equilibrium temperature is the water temperature at which the sum of all heat fluxes through the water surface is zero. It can be calculated from weather data. Mean weekly stream temperature was found to be linearly related to mean weekly equilibrium temperature above 0°C. The slopes and intercepts of the linear relationship were used to identify effects of shading, sheltering, cold water inputs (groundwater, meltwater, and deep reservoir releases) and warm water inputs (wastewater, cooling water, and lake surface water). The linearity hypothesis was confirmed for data from 596 U.S. Geological Survey stream gaging stations in the eastern and central United States. For approximately 15% (89 of 596, NSC ≥ 0.90) of stream gaging stations, weekly equilibrium temperature was a good estimator of weekly stream temperature with zero wind sheltering and sun shading. With sheltering and shading the number rose to 26% (156 of 596). For these streams the heat exchange through the water surface has the most controlling effect on stream temperatures. For the remaining 74% of streams the relationship between weekly stream temperature and weekly equilibrium temperature was also linear, but its slope was significantly less than 1.0 (even after calibration for shading and sheltering), indicating that processes other than surface heat exchange have an influence. Cold water inflows were dominant for 8% (46 of 596) of stream gaging sites. Less than 5% of all stream gaging stations showed evidence of unnatural heat inputs. Fitting an equilibrium temperature linearly to recorded stream temperatures, e.g., at a weekly timescale, can be of use to project stream temperatures under different weather-climate scenarios or to identify both natural and anthropogenic heat and hydrologic inputs to streams.
Travis Bogan - One of the best experts on this subject based on the ideXlab platform.
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stream temperature equilibrium temperature relationship
Water Resources Research, 2003Co-Authors: Travis Bogan, Omid Mohseni, Heinz G StefanAbstract:[1] Equilibrium temperature is the water temperature at which the sum of all heat fluxes through the water surface is zero. It can be calculated from weather data. Mean weekly stream temperature was found to be linearly related to mean weekly equilibrium temperature above 0°C. The slopes and intercepts of the linear relationship were used to identify effects of shading, sheltering, cold water inputs (groundwater, meltwater, and deep reservoir releases) and warm water inputs (wastewater, cooling water, and lake surface water). The linearity hypothesis was confirmed for data from 596 U.S. Geological Survey stream gaging stations in the eastern and central United States. For approximately 15% (89 of 596, NSC ≥ 0.90) of stream gaging stations, weekly equilibrium temperature was a good estimator of weekly stream temperature with zero wind sheltering and sun shading. With sheltering and shading the number rose to 26% (156 of 596). For these streams the heat exchange through the water surface has the most controlling effect on stream temperatures. For the remaining 74% of streams the relationship between weekly stream temperature and weekly equilibrium temperature was also linear, but its slope was significantly less than 1.0 (even after calibration for shading and sheltering), indicating that processes other than surface heat exchange have an influence. Cold water inflows were dominant for 8% (46 of 596) of stream gaging sites. Less than 5% of all stream gaging stations showed evidence of unnatural heat inputs. Fitting an equilibrium temperature linearly to recorded stream temperatures, e.g., at a weekly timescale, can be of use to project stream temperatures under different weather-climate scenarios or to identify both natural and anthropogenic heat and hydrologic inputs to streams.
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Stream temperature‐equilibrium temperature relationship
Water Resources Research, 2003Co-Authors: Travis Bogan, Omid Mohseni, Heinz G StefanAbstract:[1] Equilibrium temperature is the water temperature at which the sum of all heat fluxes through the water surface is zero. It can be calculated from weather data. Mean weekly stream temperature was found to be linearly related to mean weekly equilibrium temperature above 0°C. The slopes and intercepts of the linear relationship were used to identify effects of shading, sheltering, cold water inputs (groundwater, meltwater, and deep reservoir releases) and warm water inputs (wastewater, cooling water, and lake surface water). The linearity hypothesis was confirmed for data from 596 U.S. Geological Survey stream gaging stations in the eastern and central United States. For approximately 15% (89 of 596, NSC ≥ 0.90) of stream gaging stations, weekly equilibrium temperature was a good estimator of weekly stream temperature with zero wind sheltering and sun shading. With sheltering and shading the number rose to 26% (156 of 596). For these streams the heat exchange through the water surface has the most controlling effect on stream temperatures. For the remaining 74% of streams the relationship between weekly stream temperature and weekly equilibrium temperature was also linear, but its slope was significantly less than 1.0 (even after calibration for shading and sheltering), indicating that processes other than surface heat exchange have an influence. Cold water inflows were dominant for 8% (46 of 596) of stream gaging sites. Less than 5% of all stream gaging stations showed evidence of unnatural heat inputs. Fitting an equilibrium temperature linearly to recorded stream temperatures, e.g., at a weekly timescale, can be of use to project stream temperatures under different weather-climate scenarios or to identify both natural and anthropogenic heat and hydrologic inputs to streams.
Omid Mohseni - One of the best experts on this subject based on the ideXlab platform.
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stream temperature equilibrium temperature relationship
Water Resources Research, 2003Co-Authors: Travis Bogan, Omid Mohseni, Heinz G StefanAbstract:[1] Equilibrium temperature is the water temperature at which the sum of all heat fluxes through the water surface is zero. It can be calculated from weather data. Mean weekly stream temperature was found to be linearly related to mean weekly equilibrium temperature above 0°C. The slopes and intercepts of the linear relationship were used to identify effects of shading, sheltering, cold water inputs (groundwater, meltwater, and deep reservoir releases) and warm water inputs (wastewater, cooling water, and lake surface water). The linearity hypothesis was confirmed for data from 596 U.S. Geological Survey stream gaging stations in the eastern and central United States. For approximately 15% (89 of 596, NSC ≥ 0.90) of stream gaging stations, weekly equilibrium temperature was a good estimator of weekly stream temperature with zero wind sheltering and sun shading. With sheltering and shading the number rose to 26% (156 of 596). For these streams the heat exchange through the water surface has the most controlling effect on stream temperatures. For the remaining 74% of streams the relationship between weekly stream temperature and weekly equilibrium temperature was also linear, but its slope was significantly less than 1.0 (even after calibration for shading and sheltering), indicating that processes other than surface heat exchange have an influence. Cold water inflows were dominant for 8% (46 of 596) of stream gaging sites. Less than 5% of all stream gaging stations showed evidence of unnatural heat inputs. Fitting an equilibrium temperature linearly to recorded stream temperatures, e.g., at a weekly timescale, can be of use to project stream temperatures under different weather-climate scenarios or to identify both natural and anthropogenic heat and hydrologic inputs to streams.
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Stream temperature‐equilibrium temperature relationship
Water Resources Research, 2003Co-Authors: Travis Bogan, Omid Mohseni, Heinz G StefanAbstract:[1] Equilibrium temperature is the water temperature at which the sum of all heat fluxes through the water surface is zero. It can be calculated from weather data. Mean weekly stream temperature was found to be linearly related to mean weekly equilibrium temperature above 0°C. The slopes and intercepts of the linear relationship were used to identify effects of shading, sheltering, cold water inputs (groundwater, meltwater, and deep reservoir releases) and warm water inputs (wastewater, cooling water, and lake surface water). The linearity hypothesis was confirmed for data from 596 U.S. Geological Survey stream gaging stations in the eastern and central United States. For approximately 15% (89 of 596, NSC ≥ 0.90) of stream gaging stations, weekly equilibrium temperature was a good estimator of weekly stream temperature with zero wind sheltering and sun shading. With sheltering and shading the number rose to 26% (156 of 596). For these streams the heat exchange through the water surface has the most controlling effect on stream temperatures. For the remaining 74% of streams the relationship between weekly stream temperature and weekly equilibrium temperature was also linear, but its slope was significantly less than 1.0 (even after calibration for shading and sheltering), indicating that processes other than surface heat exchange have an influence. Cold water inflows were dominant for 8% (46 of 596) of stream gaging sites. Less than 5% of all stream gaging stations showed evidence of unnatural heat inputs. Fitting an equilibrium temperature linearly to recorded stream temperatures, e.g., at a weekly timescale, can be of use to project stream temperatures under different weather-climate scenarios or to identify both natural and anthropogenic heat and hydrologic inputs to streams.
D A Bonn - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic signature of a magnetic field driven phase transition within the superconducting state of an underdoped cuprate
Nature Physics, 2016Co-Authors: J B Kemper, Oskar Vafek, J B Betts, F F Balakirev, W N Hardy, Ruixing Liang, D A BonnAbstract:Specific heat measurements up to 35 T provide thermodynamic evidence for a magnetic-field-driven phase transition within the superconducting dome of a copper-oxide-based superconductor. More than a quarter century after the discovery of the high-temperature superconductor (HTS) YBa2Cu3O6+δ (YBCO; ref. 1), studies continue to uncover complexity in its phase diagram. In addition to HTS and the pseudogap2,3, there is growing evidence for multiple phases with boundaries which are functions of temperature (T), doping (p) and magnetic field4,5,6,7,8. Here we report the low-temperature electronic specific heat (Celec) of YBa2Cu3O6.43 and YBa2Cu3O6.47 (p = 0.076 and 0.084) up to a magnetic field (H) of 34.5 T, a poorly understood region of the underdoped H–T–p phase space. We observe two regimes in the low-temperature limit: below a characteristic magnetic field H′ ≈ 12–15 T, Celec/T obeys an expected H1/2 behaviour9,10; however, near H′ there is a sharp inflection followed by a linear-in-H behaviour. H′ rests deep within the superconducting phase and, thus, the linear-in-H behaviour is observed in the zero-resistance regime11. In the limit of zero temperature, Celec/T is proportional to the zero-energy electronic density of states. At one of our dopings, the inflection is sharp only at lowest temperatures, and we thus conclude that this inflection is evidence of a magnetic-field-driven quantum phase transition.
Robert Morris - One of the best experts on this subject based on the ideXlab platform.
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Zero-Temperature Glauber dynamics on [FORMULA]
Probability Theory and Related Fields, 2020Co-Authors: Robert MorrisAbstract:We study Zero-Temperature Glauber dynamics on [FORMULA] , which is a dynamic version of the Ising model of ferromagnetism. Spins are initially chosen according to a Bernoulli distribution with density p, and then the states are continuously (and randomly) updated according to the majority rule. This corresponds to the sudden quenching of a ferromagnetic system at high temperature with an external field, to one at zero temperature with no external field. Define [FORMULA] to be the infimum over p such that the system fixates at ‘ + ’ with probability 1. It is a folklore conjecture that [FORMULA] for every [FORMULA] . We prove that [FORMULA] as d → ∞.
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Zero-Temperature Glauber dynamics on ℤd
Probability Theory and Related Fields, 2020Co-Authors: Robert MorrisAbstract:We study Zero-Temperature Glauber dynamics on ℤ d , which is a dynamic version of the Ising model of ferromagnetism. Spins are initially chosen according to a Bernoulli distribution with density p, and then the states are continuously (and randomly) updated according to the majority rule. This corresponds to the sudden quenching of a ferromagnetic system at high temperature with an external field, to one at zero temperature with no external field. Define p c (ℤ d ) to be the infimum over p such that the system fixates at '+' with probability 1. It is a folklore conjecture that p c (ℤ d ) = 1/2 for every 2 ≤ d ∈ ℕ. We prove that p c (ℤ d ) → 1/2 as d → oo.
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Zero-Temperature Glauber dynamics on Z^d
arXiv: Mathematical Physics, 2008Co-Authors: Robert MorrisAbstract:We study Zero-Temperature Glauber dynamics on \Z^d, which is a dynamic version of the Ising model of ferromagnetism. Spins are initially chosen according to a Bernoulli distribution with density p, and then the states are continuously (and randomly) updated according to the majority rule. This corresponds to the sudden quenching of a ferromagnetic system at high temperature with an external field, to one at zero temperature with no external field. Define p_c(\Z^d) to be the infimum over p such that the system fixates at '+' with probability 1. It is a folklore conjecture that p_c(\Z^d) = 1/2 for every 2 \le d \in \N. We prove that p_c(\Z^d) \to 1/2 as d \to \infty.
