Some effects of soil waterlogging on the cobalt and copper status of pasture plants grown in pots

1964 ◽  
Vol 15 (3) ◽  
pp. 357 ◽  
Author(s):  
SN Adams ◽  
JL Honeysett
Keyword(s):  
Copper Content ◽  
Room Temperature ◽  
Subterranean Clover ◽  
Cobalt Content ◽  
Soil Waterlogging ◽  
Copper Status ◽  
Dry Soil ◽  
Very High ◽  
Pasture Plants ◽  
And Copper Status

Glass-house experiments were made to measure the effect of soil waterlogging on the cobalt and copper status of subterranean clover and ryegrass. The cobalt content of the plants was much increased by soil waterlogging. Very high plant cobalt contents were obtained when soil was waterlogged for 2 months at room temperature, or for shorter periods at higher temperatures, before planting; or when it was waterlogged while the plants were growing rapidly. The effect of waterlogging on the cobalt content persisted when soils were stored air-dry. Soil waterlogging raised the copper content of the plants much less than it did the cobalt. The copper content was significantly increased only when plants had been severely stunted by waterlogging. Waterlogging raised the plant cobalt content more than it reduced the yield. Thus the total uptake of cobalt, but not of copper, from the soil was increased by waterlogging.

Enzymic diagnosis of copper deficiency in subterranean clover. II. A simple field test

1982 ◽  
Vol 33 (6) ◽  
pp. 981 ◽  
Author(s):  
E Delhaize ◽  
JF Loneragan ◽  
J Webb
Keyword(s):  
Ascorbic Acid ◽  
Oxygen Uptake ◽  
Field Test ◽  
Oxidase Activity ◽  
Room Temperature ◽  
Copper Deficiency ◽  
Subterranean Clover ◽  
Ascorbate Oxidase ◽  
Copper Status ◽  
Dark Blue

A rapid, simple and robust field test is described for diagnosing copper deficiency in subterranean clover plants by measuring ascorbate oxidase activity in young folded leaf blades (YFL) homogenized in phosphate buffer. The test measures activity by counting the drops of iodine required to titrate, to a dark blue end-point, excess ascorbic acid added to and incubated for 20 min with a YFL homogenate. When reagent control titrations had titres of 11 drops of iodine, YFL homogenates from copper-adequate plants had titres of 2-3 drops, from copper-deficient plants 6-11, and from plants with marginal copper supply 4-5 drops. The test was standardized against the measurement of ascorbate oxidase activity in YFL by oxygen uptake. Ascorbate oxidase activity was remarkably insensitive to assay temperature, decreasing by only one-third with decreasing temperature from 30 to 10�C. It was also very stable in both homogenates and whole leaves. At room temperature, activity dropped by only 25% in homogenates after 6 h and in whole leaf blades after 48 h. When stored in ice, leaf blades retained full activity for at least 5 days. Diagnosis of copper deficiency by the new test agreed closely with diagnosis based on copper analysis of young open leaves taken from the same subterranean clover plants in field pastures. The test should allow extension workers to give on-the-spot advice about the copper status of pastures containing subterranean clover.

Dislocation structures around SiO2 Particles in aged Cu-Cr-SiO2

1978 ◽  
Vol 36 (1) ◽  
pp. 594-595
Author(s):  
N.J. Long ◽  
M.H. Loretto ◽  
C.H. Lloyd
Keyword(s):  
Flow Stress ◽  
Single Crystals ◽  
Room Temperature ◽  
Thin Foil ◽  
Age Hardening ◽  
Dispersion Strengthening ◽  
Accurate Picture ◽  
The Matrix ◽  
Very High ◽  
Good Agreement

IntroductionThere have been several t.e.m. studies (1,2,3,4) of the dislocation arrangements in the matrix and around the particles in dispersion strengthened single crystals deformed in single slip. Good agreement has been obtained in general between the observed structures and the various theories for the flow stress and work hardening of this class of alloy. There has been though some difficulty in obtaining an accurate picture of these arrangements in the case when the obstacles are large (of the order of several 1000's Å). This is due to both the physical loss of dislocations from the thin foil in its preparation and to rearrangement of the structure on unloading and standing at room temperature under the influence of the very high localised stresses in the vicinity of the particles (2,3).This contribution presents part of a study of the Cu-Cr-SiO2 system where age hardening from the Cu-Cr and dispersion strengthening from Cu-Sio2 is combined.

Molecule-Based Magnets—An Overview

MRS Bulletin ◽  
2000 ◽  
Vol 25 (11) ◽  
pp. 21-30 ◽  
Author(s):  
Joel S. Miller ◽  
Arthur J. Epstein
Keyword(s):  
Low Temperature ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Magnetic Ordering ◽  
Low Density ◽  
Materials Properties ◽  
The Common ◽  
New Processing ◽  
Very High

Molecule-based magnets are a broad, emerging class of magnetic materials that expand the materials properties typically associated with magnets to include low density, transparency, electrical insulation, and low-temperature fabrication, as well as combine magnetic ordering with other properties such as photoresponsiveness. Essentially all of the common magnetic phenomena associated with conventional transition-metal and rare-earth-based magnets can be found in molecule-based magnets. Although discovered less than two decades ago, magnets with ordering temperatures exceeding room temperature, very high (∼27.0 kOe or 2.16 MA/m) and very low (several Oe or less) coercivities, and substantial remanent and saturation magnetizations have been achieved. In addition, exotic phenomena including photoresponsiveness have been reported. The advent of molecule-based magnets offers new processing opportunities. For example, thin-film magnets can be prepared by means of low-temperature chemical vapor deposition and electrodeposition methods.

ION CHANNELING AND PIXE STUDIES OF S IMPLANTATION IN GaAs

1992 ◽  
Vol 02 (02) ◽  
pp. 151-159
Author(s):  
LIU SHIJIE ◽  
WANG JIANG ◽  
HU ZAOHUEI ◽  
XIA ZHONGHUONG ◽  
GAO ZHIGIANG ◽  
...  
Keyword(s):  
Room Temperature ◽  
Dislocation Loops ◽  
Good Recovery ◽  
Electrical Measurements ◽  
X Ray ◽  
Defect Complexes ◽  
Ion Channeling ◽  
Transmission Electron ◽  
Activation Efficiency ◽  
Very High

GaAs (100) crystals were implanted with 100 keV S+ to a dose of 3×1015 cm−2 in a nonchanneling direction at room temperature, and treated with rapid thermal annealing (RTA). He+ Rutherford backscattering and particle-induced X-ray emission in channeling mode in combination with transmission electron microscopy (TEM) were used to study the damage and the lattice location of S atoms. It is revealed that the RTA at 950 °C for 10 sec has resulted in a very good recovery of crystallinity with a few residual defects in the form of dislocation loops, and a very high substitutionality (~90%). The activation efficiency and the Hall mobility of the implanted samples are found to be low after the electrical measurements. Based on these results an extended dopant diffusion effect for the residual defects and a correlation between the electrical properties and defect complexes are suggested.

Effects of Different Copper Sources and Levels on Plasma Superoxide Dismutase, Lipid Peroxidation, and Copper Status of Lambs

2011 ◽  
Vol 144 (1-3) ◽  
pp. 570-579 ◽  
Author(s):  
Jianbo Cheng ◽  
Hui Ma ◽  
Caiyun Fan ◽  
Zijun Zhang ◽  
Zhihai Jia ◽  
...  
Keyword(s):  
Lipid Peroxidation ◽  
Superoxide Dismutase ◽  
Copper Status ◽  
And Copper Status

Very High Cycle Fatigue Behavior and Life Prediction of a Low Strength Weld Metal at Moderate Temperature

2011 ◽  
Author(s):  
Ming-Liang Zhu ◽  
Fu-Zhen Xuan ◽  
Zhengdong Wang
Keyword(s):  
Crack Initiation ◽  
Weld Metal ◽  
Room Temperature ◽  
Fatigue Behavior ◽  
Fatigue Properties ◽  
Dissimilar Welding ◽  
Initiation Mechanism ◽  
Metallic Inclusions ◽  
Low Strength ◽  
Very High

The fatigue properties of a low strength weld metal in a dissimilar welding joint in high cycle and very high cycle regimes were investigated by fully reversed axial tests in air at room temperature and 370°C. A clear duplex S-N curve existed as a result of the transition of fatigue failure mode from surface-induced failure to internal-induced failure at 370°C, while the S-N curve was continuously decreased at room temperature. A new model was successfully proposed to predict fatigue life, and interpret the crack initiation modes transition from surface inclusion to interior inclusion. It was concluded that cracks were initiated by competition among non-metallic inclusions, welding pores and discontinuous microstructures in high cycle regime. While in the very high cycle regime, non-metallic inclusions were the dominant crack initiation mechanism which depended on stress level, inclusion size as well as inclusion depth.

Effect on Colwell soil-test P of storing air-dry soil samples at room temperature for up to seventeen years

1994 ◽  
Vol 45 (1) ◽  
pp. 53-57
Author(s):  
M.D.A. BOLLAND ◽  
J. DHALIWAL ◽  
J.W. BOWDEN ◽  
D.G. ALLEN
Keyword(s):  
Room Temperature ◽  
Soil Samples ◽  
Soil Test ◽  
Soil Test P ◽  
Dry Soil

Annealing Kinetics of Amorphous Silicon Alloy Solar Cells Made at Various Deposition Rates

2001 ◽  
Vol 664 ◽  
Author(s):  
Baojie Yana ◽  
Jeffrey Yanga ◽  
Kenneth Lord ◽  
Subhendu Guha
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Amorphous Silicon ◽  
High Frequency ◽  
Room Temperature ◽  
Defect Density ◽  
Very High Frequency ◽  
Solar Cell Performance ◽  
Kinetics Of ◽  
Very High

ABSTRACTA systematic study has been made of the annealing kinetics of amorphous silicon (a-Si) alloy solar cells. The cells were deposited at various rates using H2 dilution with radio frequency (RF) and modified very high frequency (MVHF) glow discharge. In order to minimize the effect of annealing during light soaking, the solar cells were degraded under 30 suns at room temperature to quickly reach their saturated states. The samples were then annealed at an elevated temperature. The J-V characteristics were recorded as a function of annealing time. The correlation of solar cell performance and defect density in the intrinsic layer was obtained by computer simulation. Finally, the annealing activation energy distribution (Ea) was deduced by fitting the experimental data to a theoretical model. The results show that the RF low rate solar cell with high H2 dilution has the lowest Ea and the narrowest distribution, while the RF cell with no H2 dilution has the highest Ea and the broadest distribution. The MVHF cell made at 8Å/s withhigh H2 dilution shows a lower Ea and a narrower distribution than the RF cell made at 3 Å/s, despite the higher rate. We conclude that different annealing kinetics plays an important role in determining the stabilized performance of a-Si alloy solar cells.

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