نتایج جستجو برای: surface area density
تعداد نتایج: 1491039 فیلتر نتایج به سال:
In this paper the density and temperature dependencies of surface tension are investigated. Using the Lennard-Jones (12,6), as an effective pair interaction potential, a linear expression is derived for isotherms of g /r2 versus r2 for some normal and ChloroFluoroCarbons (CFCs)</...
Quantitative ultrastructure of Ia boutons in the ventral horn: scaling and positional relationships.
Three physiologically characterized spindle (group Ia) afferents were labeled by the intracellular injection of HRP and were processed for light-level reconstruction. Thirty-five boutons in the ventral horn were then selected for analysis. They were serially thin sectioned and characterized in terms of volume, total surface area and the surface area of apposition to postsynaptic neurons (appose...
For a given boundary Γ in R consisting of arcs and vertices, with two or more arcs meeting at each vertex, we treat the problem of estimating the area density of a soap film-like surface Σ spanning Γ. Σ is assumed to minimize area, or more generally, to be strongly stationary for area with respect to Γ. We introduce a notion of total curvature Ctot(Γ) for such graphs, or nets, Γ. We show that 2...
bsP , where A is the area and P is the perimeter of the Wilson loop, was successful in the case of simple configurations of the four quarks. In the case of tetrahedral geometry, an estimation of the minimal surface whose contours run the positions of the four quarks is necessary. We show that the regular surface approximation whose area can be calculated analytically, is a good approximation fo...
We investigate the relationship between the star formation rate per unit area and the surface density of the ISM (the local Kennicutt-Schmitt law) using a simplified model of the ISM and a simple estimate of the star formation rate based on the mass of gas in bound clumps, the local dynamical timescales of the clumps, and an efficiency parameter of around ≈ 5 per cent. Despite the simplicity of...
BACKGROUND Endothelial dysfunction is an early manifestation of cardiovascular disease (CVD) and consistently observed in patients with chronic kidney disease (CKD). We hypothesized that CKD is associated with systemic damage to the microcirculation, preceding macrovascular pathology. To assess the degree of "uremic microangiopathy", we have measured microvascular density in biopsies of the ome...
basins leading to tabriz plain are part of the sub-basins of urmia lake basin, which is located in the east azerbaijan province and in the north-western part of iran. the area of this basin is 5397 km2, and agriculture is one of the main sources of income for the people, which is dependent on groundwater and surface water resources. in this study, an attempt was made to investigate the basins l...
geological studies are basic formof operations for the exploration and development of oil and gas fields.preparation of topographical and geological maps and drawingcross section from thesemaps formspart of these operations. existing lineaments in the study area are important, and should be considered in drawing the geological sections. the evaluation of wells stability is one of the important ...
Quantitative transmission electron microscopy was used to study pore density (mean pore number ± standard deviation/nuclear envelope area) on developing pollen nuclei of alfalfa. We found that pore density is essentially uniform around the vegetative nucleus (VN) at an early developmental stage (29 ±6 pores fan'), but later, •when the VN forms a close physical association with the generative ce...
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