Factors influencing ammonia volatilization from urea in soils of the shortgrass steppe

1988 ◽  
Vol 6 (4) ◽  
pp. 323-340 ◽  
Author(s):  
D. G. Milchunas ◽  
W. J. Parton ◽  
D. S. Bigelow ◽  
D. S. Schimel
Keyword(s):  
Ammonia Volatilization ◽  
Shortgrass Steppe ◽  
Factors Influencing

scholarly journals Ammonia volatilization from arable land after application of cattle slurry. 2. Derivation of a transfer model.

1990 ◽  
Vol 38 (3A) ◽  
pp. 239-254 ◽  
Author(s):  
J. van der Molen ◽  
A.C.M. Beljaars ◽  
W.J. Chardon ◽  
W.A. Jury ◽  
H.G. van Faassen
Keyword(s):  
Transfer Function ◽  
Environmental Factors ◽  
Ammonia Volatilization ◽  
Arable Land ◽  
Surface Concentration ◽  
Background Concentration ◽  
Transfer Model ◽  
Nh3 Volatilization ◽  
Cattle Slurry ◽  
Factors Influencing

A model for the transfer of ammonia from arable land to the atmosphere after surface application or incorporation of cattle slurry is presented. The model can be used to study the interactions of the chemical, physical and environmental factors influencing volatilization losses and their combined influence on NH3 volatilization under field conditions. The model employs the following flux equation: R = k (Cs-Ca) where k is a transfer function, Cs is the NH3(g) surface concentration and Ca is the atmospheric NH3(g) background concentration. The rate of volatilization R can be calculated at any moment after application, provided k, Cs and Ca are known at that moment. The model therefore basically consists of modules which yield these variables. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Factors Influencing Selection of Resting Sites by Cattle on Shortgrass Steppe

1985 ◽  
Vol 38 (4) ◽  
pp. 295 ◽  
Author(s):  
R. L. Senft ◽  
L. R. Rittenhouse ◽  
R. G. Woodmansee
Keyword(s):  
Shortgrass Steppe ◽  
Resting Sites ◽  
Factors Influencing ◽  
Selection Of

scholarly journals Factors Influencing Patterns of Cattle Grazing Behavior on Shortgrass Steppe

1985 ◽  
Vol 38 (1) ◽  
pp. 82 ◽  
Author(s):  
R. L. Senft ◽  
L. R. Rittenhouse ◽  
R. G. Woodmansee
Keyword(s):  
Cattle Grazing ◽  
Shortgrass Steppe ◽  
Grazing Behavior ◽  
Factors Influencing

Factors influencing adhesive bonding at the bone/implant interface

1992 ◽  
Vol 50 (2) ◽  
pp. 1114-1115
Author(s):  
Julie A. Martini ◽  
Robert H. Doremus
Keyword(s):  
Electron Microscopy ◽  
Adhesive Bonding ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Bone Implant ◽  
Factors Influencing ◽  
Lr White ◽  
Transmission Electron ◽  
New Zealand White Rabbits ◽  
Scanning Electron

Tracy and Doremus have demonstrated chemical bonding between bone and hydroxylapatite with transmission electron microscopy. Now researchers ponder how to improve upon this bond in turn improving the life expectancy and biocompatibility of implantable orthopedic devices.This report focuses on a study of the- chemical influences on the interfacial integrity and strength. Pure hydroxylapatite (HAP), magnesium doped HAP, strontium doped HAP, bioglass and medical grade titanium cylinders were implanted into the tibial cortices of New Zealand white rabbits. After 12 weeks, the implants were retrieved for a scanning electron microscopy study coupled with energy dispersive spectroscopy.Following sacrifice and careful retrieval, the samples were dehydrated through a graduated series starting with 50% ethanol and continuing through 60, 70, 80, 90, 95, and 100% ethanol over a period of two days. The samples were embedded in LR White. Again a graduated series was used with solutions of 50, 75 and 100% LR White diluted in ethanol.

Factors Influencing Electrophysiologic Responsivity in Normal Adults

1965 ◽  
Vol 8 (4) ◽  
pp. 323-347
Author(s):  
Robert Goldstein ◽  
Benjamin RosenblÜt
Keyword(s):  
Conditioned Stimulus ◽  
White Light ◽  
Pure Tone ◽  
Alpha Rhythm ◽  
White Women ◽  
White Men ◽  
Inverse Relation ◽  
Factors Influencing ◽  
Electrodermal Responses ◽  
Normal Adults

Electrodermal and electroencephalic responsivity to sound and to light was studied in 96 normal-hearing adults in three separate sessions. The subjects were subdivided into equal groups of white men, white women, colored men, and colored women. A 1 000 cps pure tone was the conditioned stimulus in two sessions and white light was used in a third session. Heat was the unconditioned stimulus in all sessions. Previously, an inverse relation had been found in white men between the prominence of alpha rhythm in the EEG and the ease with which electrodermal responses could be elicited. This relation did not hold true for white women. The main purpose of the present study was to answer the following questions: (1) are the previous findings on white subjects applicable to colored subjects? (2) are subjects who are most (or least) responsive electrophysiologically on one day equally responsive (or unresponsive) on another day? and (3) are subjects who are most (or least) responsive to sound equally responsive (or unresponsive) to light? In general, each question was answered affirmatively. Other factors influencing responsivity were also studied.

Factors Influencing Pressure in the Portal Vein as Studied in the Intact Animal

1950 ◽  
Vol 16 (1) ◽  
pp. 194-210 ◽  
Author(s):  
Frederick W. Hoffbauer ◽  
Jesse L. Bollman ◽  
John L. Grindlay
Keyword(s):  
Portal Vein ◽  
Intact Animal ◽  
Factors Influencing
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