Results 261 to 270 of about 677,718 (302)
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Aggregation and Aggregate Stability in Forest and Range Soils
Soil Science Society of America Journal, 1988Abstract A simple method for measuring aggregation and aggregate stability across soils of widely varying structure and texture is presented. The method uses standard techniques of particle‐size analysis to measure yield of fine particles (<26‐µm estimated spherical diam.) after three types of dispersion treatments: shaking in ...
T. C. Strickland +3 more
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Stability of Some Mechanisms of Chemotactic Aggregation
SIAM Journal on Applied Mathematics, 2002The stability of a blow-up mechanism for a particular Keller-Segel model that yields chemotactic aggregation is investigated. It is shown using matched asymptotic methods that the considered blow-up mechanism is stable. It is shown that small perturbations of the initial data produce a small shifting on the blow-up time and the blow-up point but not ...
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Gravity as a factor of aggregative stability and coagulation
Advances in Colloid and Interface Science, 2007Gravity is a potential factor of aggregative stability and/or coagulation for any heterogeneous system having a density contrast between the dispersed phase and its dispersion medium. However, gravity becomes comparable to other stability factors only when the particle size becomes large enough.
A S, Dukhin, S S, Dukhin, P J, Goetz
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Chemical and Physical Stability of Microbially Stabilized Aggregates
Soil Science Society of America Journal, 1971Abstract Chemical properties of microbially bound aggregates were determined by organic solvent extraction and by the rate of sonic dispersion of the aggregates. Seven fungi, six streptomycetes, and four bacteria, produced in situ chemically different binding agents which ...
R. B. Aspiras +3 more
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Protein stability and aggregation in Parkinson's disease
Biochemical Journal, 2008Parkinson's disease (PD), the second most common age-related neurodegenerative disease, results in abnormalities in motor functioning. Many fundamental questions regarding its aetiology remain unanswered. Pathologically, it is not until 70–80% of the dopaminergic neurons from the substantia nigra pars compacta are lost before clinical symptoms are ...
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Polyacrylamide adsorption and aggregate stability
Soil and Tillage Research, 1999Abstract The adsorption characteristics of synthetic organic polymers play a major role in their effects on the stabilization of aggregates. We hypothesized that high molecular weight polymers adsorb on both outer and inner surfaces of large aggregates (>1.0 mm), and thus enhance the resistance of aggregates to external forces (e.g., water drop ...
G.J Levy, W.P Miller
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Aggregate Output Stability: Divergent Perspectives
Journal of Business and Economic StudiesThe main objective of this article was to describe two asymmetric perspectives of the aggregate imbalance approach. Starting from the contrast of the Rational Expectations and Keynesian approaches, we analyze the characterization that the general reserve makes of the causes of inflation and the implications that it has on economic policy decisions ...
Güell Camacho, Ricardo Antonio +1 more
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Aggregate Substitution Effects Implying Global Stability
Journal of Economic Theory, 2001A system of autonomous differential equations is considered with the goal of using in economics. The author discusses the stability arguments for tatonnement. The basic aim here is to show that the standard conditions used to obtain global stability depend only on aggregate substitution effects.
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