Evapotranspiration Computed to Estimate Leaching Fractions

Kincaid, D. C.; Kruse, E. Gordon; Duke, Harold R.; Champion, Didier

doi:10.13031/2013.35011

Cited by 7 publications

(8 citation statements)

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“…In the absence of random fields the model exhibits a tricritical point 21 in the h-t phase diagram for ⑀Ͼ3/5. In the numerical calculations of the next sections, we just consider the case ⑀ϭ1, which is typical for the range of values ⑀Ͼ3/5.…”

Section: ͑413c͒mentioning

confidence: 99%

“…21 It is convenient to introduce the reduced quantities In terms of the uniform and staggered magnetizations,…”

Section: Landau Expansionmentioning

confidence: 99%

“…The case of no randomness (ϭ0) corresponds to the pure Ising metamagnet. 21 The phase diagram comprises a metamagnetic phase (m s 0) at low fields and a paramag-netic phase (m s ϭ0) at high fields. The transitions between these phases are first-order for low temperatures and secondorder for high temperatures, being separated by a tricritical point 21 at tϭ2/3, as shown in Fig.…”

Section: Phase Diagrams For the Double-␦ Distributionmentioning

confidence: 99%

“…2, we show the h-t plane for various values of the randomness . Again, the case of no randomness (ϭ0) corresponds to the pure Ising metamagnet, 21 with a firstorder separated from a second-order transition line by a tricritical point at tϭ2/3. The tricritical temperature decreases as the randomness is increased until ϭ0.5, when the transition between the metamagnetic and paramagnetic phases becomes everywhere of second order.…”

Section: Phase Diagrams For the Gaussian Distributionmentioning

confidence: 99%

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Metamagnets in uniform and random fields

Yokoi

Salinas

1998

Phys. Rev. B

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We study a two-sublattice Ising metamagnet with nearest and next-nearest-neighbor interactions, in both uniform and random fields. Using a mean-field approximation, we show that the qualitative features of the phase diagrams are significantly dependent on the distribution of the random fields. In particular, for a Gaussian distribution of random fields, the behavior of the model is qualitatively similar to a dilute Ising metamagnet in a uniform field.Comment: 14 pages, latex, 3 figures include

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Section: ͑413c͒mentioning

confidence: 99%

“…21 It is convenient to introduce the reduced quantities In terms of the uniform and staggered magnetizations,…”

Section: Landau Expansionmentioning

confidence: 99%

Section: Phase Diagrams For the Double-␦ Distributionmentioning

confidence: 99%

Section: Phase Diagrams For the Gaussian Distributionmentioning

confidence: 99%

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Metamagnets in uniform and random fields

Yokoi

Salinas

1998

Phys. Rev. B

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“…Continuous tension may be applied to percolation samplers at a constant potential via hanging water columns (Holder et al 1991;Boll, Steenhuis, and Selker 1992;Zhu, Fox, and Toth 2002) or by pneumatic vacuum (Cole, Gessel, and Held 1961;Cochran, Marion, and Leaf 1970;Kincaid et al 1979;Haines, Waide, and Todd 1982;Hergert 1986;Montgomery, Prunty, and Bauder 1987;Klocke et al 1993). Continuous tension applied to samplers may also be varied to match ambient soil conditions at the sampler-soil interface, either manually (Brye et al 1999) or automatically (Duke and Haise 1973;van Grinsven et al 1988;Lentz, Sojka, and Kincaid 1998;Lentz and Kincaid 2003;Masarik et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Automated System for Collecting Multiple, Sequential Samples from Soil Water Percolation Samplers under Continuous Vacuum

Lentz¹

2006

Communications in Soil Science and Plant Analysis

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Abstract:Manually collecting a series of sequential, discrete water samples from soil water percolation samplers, or similar devices that withdraw water from unsaturated porous media under continuous vacuum, is a logistical challenge, though the resulting collection can provide valuable information on the dynamics present in both laboratory and field studies. This article describes a sequential tension autosampler (STAS) that executes such sampling automatically. The STAS operates on 12 volts direct current (VDC) and can be adapted for laboratory and field applications. A data logger was programmed to operate a series of solenoid valves, which direct soil water collected under tension to seven individual collection bottles. The number of sequential samples, sample period, start time, and between-sample interval are specified by the user. The operator only need to attend the system periodically to transfer water samples to storage vials and program the next sampling sequence. In a laboratory study, the apparatus successfully collected samples overnight or over several days.

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