نتایج جستجو برای: density tracer

تعداد نتایج: 491143  

Journal: :Physical review 2021

Large-scale Fourier modes of the cosmic density field are great value for learning about cosmology because their well-understood relationship to fluctuations in early universe. However, variance generally limits statistical precision that can be achieved when constraining model parameters using these as measured galaxy surveys, and moreover, sometimes inaccessible due observational systematics ...

Journal: :Neuro endocrinology letters 2002
Robert Pichler Wilhelmine Maschek Carmen Crespillo Isabel Esteva Federico Soriguer

Animal experiments and observations in human brains have convincingly shown that sexual differentiation not only concerns the genitalia but also the brain. This has been investigated also in the light of a possible explanation of a presumed biological aetiology of transsexuality. The volume of the central subdivision of the bed nucleus of the stria terminalis, a brain area that is essential for...

Journal: :Cancer biotherapy & radiopharmaceuticals 2012
Koen Mertens Gilles Mees Bieke Lambert Christophe Van de Wiele Ingeborg Goethals

In oncology 2-deoxy-2-[(18)F]fluoro-D-glucose ([(18)F]-FDG), a glucose analogue, is the most used positron emission tomography (PET) tracer. There are however some limitations due to low metabolic activity or high surrounding physiological uptake in several tumors or regions. Investigating new tracers or methods is expensive and elaborative when animal experiments or phase I clinical trials are...

2001
Marco Lombardi João Alves

We generalize the technique of ?) to map dust column density through a molecular cloud (Nice) to an optimized multi-band technique (Nicer) that can be applied to any multi-band survey of molecular clouds. We present a first application to a ∼ 625 deg subset of the Two Micron All Sky Survey (2MASS) data and show that when compared to Nice, the optimized Nicer technique (i) achieves the same exti...

2006
A. C. Dale M. D. Levine J. A. Barth J. A. Austin

[1] A fluorescent dye tracer was injected into the pycnocline on the Oregon shelf at a depth of 9–10 m. It spread rapidly cross-shelf as two distinct layers, one above the other in the water column, split by interleaving dye-free water. The vertical scale of these layers, and associated density steps, was 1–2 m, and the horizontal extent of interleaving exceeded 1.6 km after an inertial period....

Journal: :Journal of lipid research 1995
A Rebbaa J Portoukalian

Gangliosides in normal serum are found only in lipoproteins and the relative content of the three major lipoprotein fractions is low density lipoprotein > high density lipoprotein > very low density lipoprotein (LDL > HDL > VLDL). Upon in vitro incubation of labeled gangliosides with human serum, about 15% of the exogenous gangliosides became associated with the albumin fraction and 85% were di...

2002
A.Yu. Gelfgat

The motion of tracer particles used for visualization in a steady axisymmetric swirling flow in a closed rotating disk–cylinder system is studied numerically. It is assumed that there exists a density mismatch between the particles and the fluid. It is shown that such a slight density mismatch leads to a deviation of the particle motion from steady axisymmetric streamlines, which in its turn yi...

2007
Pierre Lancien Eric Lajeunesse François Métivier

We report a new method to measure the velocity of a fluid in the vicinity of a wall. The method, that we call Particle-Shadow Tracking (PST), simply consists in seeding the fluid with a small number of fine tracer particles of density close to that of the fluid. The position of each particle and of its shadow on the wall are then tracked simultaneously, allowing one to accurately determine the ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده زیست شناسی 1388

abstract chickpea is weak in competition of weeds that damages to it at between 40 t0 60 percent. kermanshah province is one of the most important region for chickpea fields in iran. for these reosons, weed management is necessary in this crop. in order to evaluate of herbicides and stubble control on broad leave weeds control in chickpea. experiment was conducted in agricultural research stat...

Journal: :Advances in Water Resources 2023

Electrokinetic (EK) techniques can effectively mobilize amendments and contaminants in porous media therefore have a great potential for situ subsurface remediation of wide variety organic inorganic contaminants. However, the fundamental mechanisms governing EK applications are complex entail coupling between different flow, transport, electrostatic geochemical processes. In this study we inves...

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