منابع مشابه
PCC Pavement Deterioration and Expansive Mineral Growth
In order to evaluate the importance of newly-formed minerals in the premature deterioration of Iowa highway concrete, a two-phase study was undertaken. In the first phase, we performed petrographic and SEM/EDAX analyses to determine chemical and mineralogical changes in the aggregate and cement paste of samples taken from Iowa concrete highways that showed premature deterioration. In the second...
متن کاملExpansive growth of plant cell walls.
The enlargement of plant cell walls is a key determinant of plant morphogenesis. Current models of the cell wall are reviewed with respect to their ability to account for the mechanism of cell wall enlargement. The concept of primary and secondary wall loosening agents is presented, and the possible roles of expansins, xyloglucan endotransglycosylase, endo-1,4-beta-D-glucanase, and wall synthes...
متن کاملBoundary lubrication properties of materials with expansive freezing.
We have performed molecular dynamics simulations of solid-solid contacts lubricated by a model fluid displaying many of the properties of water, particularly its expansive freezing. Near the region where expansive freezing occurs, the lubricating film remains fluid, and the friction force decreases linearly as the shear velocity is reduced. No sign of stick-slip motion is observed, even at the ...
متن کاملThe Effects of Portland’s Urban Growth Boundary on Urban Development Patterns and Commuting
This research investigates the effects of Portland’s urban growth boundary (UGB) on urban development patterns and mobility. Three different methods are adopted for evaluating Portland’s UGB: intermetropolitan comparisons; comparisons inside and outside the UGB; and, statistical analyses utilising regression models. Intermetropolitan comparisons do not support the conclusion that Portland’s UGB...
متن کاملDimensional Analysis of Expansive Growth of Cells with Walls
Expansive growth is central to development, morphogenesis, and sensory responses of algal, fungal and plant cells. These walled cells generate turgor pressure by absorbing water. The turgor pressure produces irreversible (plastic) and reversible (elastic) deformations in a wall whose mechanical properties are regulated biochemically. These biophysical processes (water uptake and wall deformatio...
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ژورنال
عنوان ژورنال: Modern Economy
سال: 2014
ISSN: 2152-7245,2152-7261
DOI: 10.4236/me.2014.57074