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Showing 1 to 17 of 17 for “"Stable Forms"”.
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Hitchin Functionals, h-Principles and Spectral Invariants
… Hitchin functionals and $h$-principles for stable forms on oriented manifolds, with a special focus on $\mathrm{G}_2$ and $\widetilde{\mathrm{G}}_2$ 3- and 4-forms. Additionally, it introduces two new spectral invariants of torsion-free $\mathrm{G}_2$-structures. Part I begins by …
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Analytical investigations of convective effects on a solid-liquid interface
… irrespective of the interface shape. The stable forms of the solidified front are then found. In the case of hexagonal pattern, the fluid motion is shown to be upward at the cells centers. Hexagons are also found to exhibit a higher heat flux than either rolls or squares. The non-planar …
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A kinetic and mechanistic study on the oxidation of chromium oxide in pure chemicals and in ferrometallurgical slags
… of oxidation states but the environmentally stable forms are trivalent (Cr(III)) and hexavalent (Cr(VI)) chromium. These two forms are noted for their different degrees of toxicity and mobility. Hexavalent chromium is more toxic and mobile and has been responsible for a number of illnesses in …
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Electrolytic remediation of chromated copper arsenate wastes
… used to determined the most thermodynamically stable forms of the metals as a function of pH and electrochemical potential. This analysis predicted that under the conditions of codeposition of all three metals, hydrogen and arsine would also be produced.
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Spatial and Temporal Variability of In-Stream Functioning within a Forested, Headwater Piedmont Watershed
… increased nitrogen inputs by converting them to stable forms, ultimately through denitrification to N2 gas. However, the temporal environmental factors controlling baseflow nitrogen retention are poorly understood, particularly temperature, shading, and dissolved organic matter dynamics. This …
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Animal-machine
… the representational logics that underly the stable forms of “animal,” “machine,” “object” as well as their distinction from human social imaginaries, revealing those formerly secure sites of identification as textual interplay between human and non-human markings. In this way, animal-machine …
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The engineering geology and stability of the rapidly alternating limestone and mudrock sea cliffs of glamorgan
… allotropy of sulphide minerals. The least stable forms were identified in the more calcareous mudrocks, and a laboratory leaching experiment demonstrated that weatherability was greatest in such mudrocks. Pyrite oxidation was shown not only to enhance carbonate leaching, but to degrade the …
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Plant Activation of Bicyclic Aromatic Amines, Benzidine and 4-Aminobiphenyl
… with a molecular weight of $\ge$100 kDa and stable for more than 7 months when stored at 4$\sp\circ$C. To define the mutagenic specificity of the plant-activated aromatic amine metabolite, mutant spectra of spontaneous revertants and revertants induced by the plant- and mammalian-activated of …
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Characterizing the mechanism and rate of calcium phosphate precipitation in aerobic granular sludge
… from amorphous calcium phosphate to more stable forms. XRD analysis resulted in a solids spectra that contained peaks characteristic of hydroxyapatite, suggesting that more crystalline forms of calcium phosphate were deposited within the granules over time. SEM imaging showed an increase …
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Nutrient Retention and Cycling in Southeastern U.S. Loblolly Pine (Pinus taeda L.) and Sweetgum (Liquidambar styraciflua L.) Plantations
… lasting effects by increasing mineral soil P in stable forms that can be made available for plant uptake over time suggesting increased supply of P to trees in the next rotation. Retention of P in the mineral soil was likely due to the tendency of acidic, sandy mineral soils to accumulate P in …
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Comparative analysis of stem carbon partitioning and development in Andropogoneae bioenergy grasses
… species. While cellulose and lignin are the more stable forms, the plant only needs to produce enough of it to allow for basic cell wall function. Starch is the most common storage form for excess sugar accumulation; however, plants can also store carbon in the form of sucrose even though it is …
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COMPUTATIONAL STUDY OF THE INTERACTION BETWEEN MOLECULES OF TECHNOLOGICAL INTEREST AND MODIFIED NANOTUBULAR CLAYS
… about the nanotube surfaces as well as its most stable forms under different pH conditions. After the structural and energetic aspects of the pure HNT was well-established, the computational design on HNT nanocomposites for slow-released corrosion inhibitors took place and then experimentally …
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From Pine Cones to Minimal Surfaces: The Geometry and Mechanics of Morphing Bilayers
… shapes and reconfigure between their different stable forms. This would have wide ranging applications in a variety of contexts such as robotics for instance, where smart actuators and mimicking live tissue is needed, or for deployable structures in aeronautics. A subset of this type of growth …
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PHOSPHATE ADSORPTION AND DESORPTION ON TWO CONTRASTING SOILS USED FOR LAND TREATMENT OF WASTEWATER
… mg/g) were sorbed, phosphate was bound in very stable forms which were largely unavailable to exchange. Sorption was slightly less complete in suspensions at pH 8.0 as compared to pH 5.0 and 6.5. At higher loadings of phosphate, an increasing amount of exchangeable phosphate was sorbed on the …
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Stability and esterification of lutein in bread wheat during post harvest storage in comparison with banana.
… wheat and durum based products but tends to be unstable against heat and UV light. During post harvest storage of bread wheat grain some of the lutein may be converted to mono- and di-fatty acid esters that appear to be more stable forms of lutein. The aims of the work presented in this thesis …
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Conformational Behavior and Structural Parameters of Some Cyclic and Chain Molecules
… out. From these spectral data, the possible stable conformers have been identified and the enthalpy differences are given among the various forms for each molecule. By utilizing microwave determined rotational constants for isotopomers, combined with structural parameters predicted from …
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Synthesis, Characterization and Corrosion Inhibition Investigation of substituted triazines on aluminium and mild steel in 1M HCl: Experimental and Theoretical approach
… are gradually converted to more chemically stable forms such as oxides, hydroxides, or sulphides. This process occurs because metals tend to return to their natural states. Proper selection and use of corrosion inhibitors can greatly extend the lifespan of metal components and reduce …