610,419 research outputs found
S T R U K T U R A N A T O M I D A U N L E N G K E N G D IA M O N D R IV E R
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Braid Entropy of Faraday Waves driven 2D Turbulence
No full textWe report new experimental results that use tools from braid theory to characterize two-dimensional turbulent flows driven by Faraday waves. The average topological length of the material fluid lines is found to grow exponentially with time. It allows us to compute the braid’s topological entropy SBraid. We show that SBraid increases as the square root of the turbulence kinetic energy E ~ u^2, where u^2 is the horizontal velocity variance . At long times, the PDFs of Lbraid are positively skewed and present strong exponential tails
Resolución UNRN N° 762/2009. Sustitúyase el Artículo 3° de las Resoluciones UNRN N° 28/2009, UNRN N° 48/2009 y UNRN N° 50/2009.
No full textFil: Universidad Nacional de Río Negro (U). Universidad Nacional de Río Negro. Río Negro, ArgentinaResolución UNRN N° 762/2009. Sustitúyase el Artículo 3° de las Resoluciones UNRN N° 28/2009, UNRN N° 48/2009 y UNRN N° 50/2009.fals
Resolución UNRN N° 622/2009. Modificase la fecha de las Resoluciones UNRN N° 50/2009 a 61/2009
No full textFil: Universidad Nacional de Río Negro (U). Universidad Nacional de Río Negro. Río Negro, ArgentinaResolución UNRN N° 622/2009. Modificase la fecha de las Resoluciones UNRN N° 50/2009 a 61/2009fals
Resolución UNRN N° 799/2009. Deja sin efecto.
No full textFil: Universidad Nacional de Río Negro (U). Universidad Nacional de Río Negro. Río Negro, ArgentinaResolución UNRN N° 799/2009. Deja sin efecto Resoluciones UNRN N° 175/2009, 176/2009, 180/2009 y 181/2009 a partir de febrero de 2010.-fals
Towards novel C–N materials
Get PDFTwo modifications of the novel guanidinium dicyanamide have been obtained by means of ion-exchange reaction in aqueous or methanolic solution. The hygroscopic compounds were characterized by solution state NMR, mass spectrometry and vibrational spectroscopy. The crystal structures of the polymorphs were elucidated by means of single-crystal X-ray diffraction at 200 K {β-[C(NH2)3][N(CN)2]: Pna21, Z=8, a=1373.1(3), b=495.5(1), c=1802.9(4) pm, U=1226.7(4)×106 pm3; α-[C(NH2)3][N(CN)2]: P21/c, Z=8, a=1924.9(4), b=496.0(1), c=1372.4(3) pm, β=110.46(3)°, U=1227.5(4)×106 pm3} and were found to be largely equivalent in terms of the overall assembly of the molecular ions. Thermodynamic and kinetic aspects of the temperature behaviour of the polymorphs, which is characterized by a succession of thermal events in the temperature region between 240 and 440 K, were assessed by means of temperature-dependent X-ray powder diffraction and thermal analysis. Due to the chemical composition of the novel dicyanamide (C3N6H6), which is formally identical with that of melamine C3N3(NH2)3, and its thermal reactivity, which is represented by the facile conversion into melamine around 400 K, guanidinium dicyanamide may be ideally suited as a molecular precursor for chemical approaches toward highly condensed graphitic carbon nitride materials
Fully Turbulent Mean Velocity Profile for Purely Viscous non-Newtonian Fluids
No full textThe characteristic near wall behavior of turbulent flow of purely-viscous non-Newtonian fluids is discussed for both power-law (P.-L.) and Herschel-Bulkley (H.-B.) rheological models. A proper scaling is presented for H.-B. fluids to establish an analogy with power-law fluids with same flow index. To provide reference data for turbulent flow of non-Newtonian fluids, DNS simulations of power-law fluids are conducted in a rectangular channel for a large range of power-law indices ( = 0.5, 0.69, 0.75, 0.9, 1, 1.2). The DNS data show that the mean velocity profile in the viscous and logarithmic layers follow expressions of the form and respectively, where shows a logarithmic dependency on the flow index.Comparison with some experimental data shows the above formulation to be valid for Reynolds numbers (based on shear velocity) as high as 1000
Resolución UNRN N° 419/2009. Dejar sin efecto la Resolución UNRN N° 318/2009. Designa docente interina.
No full textFil: Universidad Nacional de Río Negro (U). Universidad Nacional de Río Negro. Río Negro, ArgentinaResolución UNRN N° 419/2009. Dejar sin efecto la Resolución UNRN N° 318/2009. Designa docente interina.fals
Resolución UNRN N° 690/2009. Sustitúyase el artículo 1° de la Resolución UNRN N° 610/2009.
No full textFil: Universidad Nacional de Río Negro (U). Universidad Nacional de Río Negro. Río Negro, ArgentinaResolución UNRN N° 690/2009. Sustitúyase el artículo 1° de la Resolución UNRN N° 610/2009.fals
Resolución UNRN N° 603/2009. Sustitúyase el Anexo I de la Resolución UNRN N° 340/2009
No full textFil: Universidad Nacional de Río Negro (U). Universidad Nacional de Río Negro. Río Negro, ArgentinaResolución UNRN N° 603/2009. Sustitúyase el Anexo I de la Resolución UNRN N° 340/2009fals
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