scholarly journals Effects of the size of cosmological N-body simulations on physical quantities - I. Mass function

2006 ◽  
Vol 370 (2) ◽  
pp. 993-1002 ◽  
Author(s):  
J. S. Bagla ◽  
J. Prasad
Keyword(s):  
Mass Function ◽  
Physical Quantities

scholarly journals The bivariate luminosity and mass functions of the local HRS galaxy sample

2018 ◽  
Vol 617 ◽  
pp. A33 ◽  
Author(s):  
P. Andreani ◽  
A. Boselli ◽  
L. Ciesla ◽  
R. Vio ◽  
L. Cortese ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Star Formation ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Far Infrared ◽  
Mass Function ◽  
Stellar Mass ◽  
The Relationship ◽  
Mass Functions ◽  
Physical Quantities

Aims.We discuss the results of the relationships between theK-band and stellar mass, FIR luminosities, star formation rate, and the masses of the dust and gas of nearby galaxies computing the bivariateK-band-luminosity function (BLF) and bivariateK-band-mass function (BMF) of theHerschelReference Survey (HRS), a volume-limited sample with full wavelength coverage.Methods.We derive the BLFs and BMFs from theK-band and stellar mass, FIR luminosities, star formation rate, dust and gas masses cumulative distributions using a copula method, which is outlined in detail. The use of the computed bivariate taking into account the upper limits allows us to derive a more solid statistical ground for the relationship between the observed physical quantities.Results.The analysis shows that the behaviour of the morphological (optically selected) subsamples is quite different. A statistically meaningful result can be obtained over the whole HRS sample only from the relationship between theK-band and the stellar mass, while for the remaining physical quantities (dust and gas masses, far-infrared luminosity, and star formation rate), the analysis is distinct for late-type (LT) and early-type galaxies (ETG). However, the number of ETGs is small to perform a robust statistical analysis, and in most of the case results are discussed only for the LTG subsample. The luminosity and mass functions (LFs, MFs) of LTGs are generally dependent on theK-band and the various dependencies are discussed in detail. We are able to derive the corresponding LFs and MFs and compare them with those computed with other samples. Our statistical analysis allows us to characterise the HRS which, although non-homogeneously selected and partially biased towards low IR luminosities, may be considered as representative of the local LT galaxy population.

scholarly journals The Fractal Calculus for Fractal Materials

2019 ◽  
Vol 3 (1) ◽  
pp. 8 ◽  
Author(s):  
Fakhri Jafari ◽  
Mohammad Asgari ◽  
Amir Pishkoo
Keyword(s):  
Fractal Structure ◽  
Differential Forms ◽  
Mass Function ◽  
Ideal Gas ◽  
Fractal Structures ◽  
Volume Expansivity ◽  
Fractal Calculus ◽  
Fractal Materials ◽  
Physical Quantities ◽  
Dimensionality Of Space

The major problem in the process of mixing fluids (for instance liquid-liquid mixers) is turbulence, which is the outcome of the function of the equipment (engine). Fractal mixing is an alternative method that has symmetry and is predictable. Therefore, fractal structures and fractal reactors find importance. Using F α -fractal calculus, in this paper, we derive exact F α -differential forms of an ideal gas. Depending on the dimensionality of space, we should first obtain the integral staircase function and mass function of our geometry. When gases expand inside the fractal structure because of changes from the i + 1 iteration to the i iteration, in fact, we are faced with fluid mixing inside our fractal structure, which can be described by physical quantities P, V, and T. Finally, for the ideal gas equation, we calculate volume expansivity and isothermal compressibility.

The Arches Mass Function

2003 ◽  
Vol 6 ◽  
pp. 289-289
Author(s):  
A. Stolte
Keyword(s):  
Mass Function

Effect of the structural changes on the mechanical properties of the sintered films

2016 ◽  
Vol 12 (1) ◽  
pp. 4141-4144
Author(s):  
Garima Jain
Keyword(s):  
Crystallite Size ◽  
Lattice Constant ◽  
Structural Changes ◽  
Structural Investigation ◽  
Energy Gap ◽  
Lattice Parameter ◽  
Metal Chalcogenides ◽  
Optical Energy Gap ◽  
Tin Telluride ◽  
Physical Quantities

Polycrystalline films of tin telluride were prepared by sintering technique. The structural investigation of the films with different thicknesses enables to determine lattice parameter, crystallite size and strain existing in the films. The XRD traces showed that strain was tensile in nature. The crystallite size increases with thickness while strain decreases. Higher the value of tensile strain, larger is the lattice constant. The optical energy gap shows a descending nature with increasing strain and so with the lattice constant. Such an attempt made to delve into interdependence of basic physical quantities helps to explore the properties of SnTe and utilize it as an alternative to heavy metal chalcogenides in various technological applications.  

The analysis of measurements of flatness of the artificial surfaces of the runway of civil aerodrome

2018 ◽  
pp. 14-23
Author(s):  
А. Богоявленский ◽  
A. Bogoyavlenskiy
Keyword(s):  
Artificial Turf ◽  
Artificial Surfaces ◽  
Physical Quantities

One of the most important characteristics of the runways with artificial turf of civil airfields is their evenness. Passengers of the mainline aircraft – both in domestic and foreign airportssubjectively assess the airfield pavements evenness by the presence or absence of shaking during the movement of the aircraft on the runway both during takeoff and landing. In units of what physical quantities, by what means and methods is measured (estimated) the evenness of aerodrome surfaces? How to ensure of the traceability of measurements from the primary national etalon of parameter to the value of the measured value. About it-this publication.

Low‐Mass Star Formation and the Initial Mass Function in IC 348

1998 ◽  
Vol 508 (1) ◽  
pp. 347-369 ◽  
Author(s):  
K. L. Luhman ◽  
G. H. Rieke ◽  
C. J. Lada ◽  
E. A. Lada
Keyword(s):  
Star Formation ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Mass Star ◽  
Low Mass

Exact nonlinear wave solutions of the incompressible magnetohydrodynamic equations in a sheared magnetic field

1990 ◽  
Vol 44 (1) ◽  
pp. 25-32 ◽  
Author(s):  
Hiromitsu Hamabata
Keyword(s):  
Magnetic Field ◽  
Incompressible Fluid ◽  
Large Amplitude ◽  
Uniform Magnetic Field ◽  
Magnetohydrodynamic Equations ◽  
Wave Solutions ◽  
Field Lines ◽  
Incompressible Magnetohydrodynamic Equations ◽  
Physical Quantities ◽  
Nonlinear Wave Solutions

Exact wave solutions of the nonlinear jnagnetohydrodynamic equations for a highly conducting incompressible fluid are obtained for the cases where the physical quantities are independent of one Cartesian co-ordina.te and for where they vary three-dimensionally but both the streamlines and magnetic field lines lie in parallel planes. It is shown that there is a class of exact wave solutions with large amplitude propagating in a straight but non-uniform magnetic field with constant or non-uniform velocity.

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