نتایج جستجو برای: spherical model
تعداد نتایج: 2142087 فیلتر نتایج به سال:
The dynamics of biological polymers, including proteins, RNA, and DNA, occur in very high-dimensional spaces. Many naturally occurring polymers can navigate a vast phase space rapidly find their lowest free energy (folded) state. Thus, although the search process is stochastic, it not completely random. Instead, best described terms diffusion along downhill landscape. In this context, there hav...
We investigate some modifications to the Press & Schechter (1974) (PS) prescription resulting from shear and tidal effects. These modifications rely on more realistic treatments of the collapse process than the standard approach based on the spherical model. First, we show that the mass function resulting from a new approximate Lagrangian dynamic (Audit & Alimi 1996), contains more objects at h...
We study the effect of tidal torques on the collapse of density peaks through the equations of motion of a shell of barionic matter falling into the central regions of a cluster of galaxies. We calculate the time of collapse of the perturbation taking into account the gravitational interaction of the quadrupole moment of the system with the tidal field of the matter of the neighbouring proto-cl...
Aspherical explosion models for the hypernova (hyper-energetic supernova) SN 1998bw are presented. Nucleosynthesis in aspherical explosions is examined with a two-dimensional hydrodynamical code and a detailed nuclear reaction network. Aspherical explosions lead to a strong α-rich freezeout, thus enhancing the abundance ratios [Ca, Ti, and Zn / Fe] in the ejecta. The nebular line profiles of th...
In this report, past research is reviewed, which suggests that the personality traits of psychoticism and aggressiveness likely moderate the negative effects of violent video games (VVGs). The Five-Factor Model (FFM) of personality is then used as a taxonomy to integrate these findings and examine why these traits are important moderator variables. Analyses suggest that these traits likely mode...
The critical conditions for vigorous burning of spherical carbón partióles are derived using asymptotic techniques for large Zel'dovich numbers. The particle liíetime and the temperature history are obtained for both supercritical and subcritical regimes, when a carbón particle is suddenly exposed to a stagnant high temperature oxidizing atmosphere. For Damkóhler numbers below a critical number...
We measure the evolution of the rest-frame K-band Fundamental Plane from z = 1 to the present by using IRAC imaging of a sample of early-type galaxies in the Chandra Deep Field-South at z ∼ 1 with accurately measured dynamical masses. We find that M/LK evolves as ∆ ln (M/LK) = (−1.18± 0.10)z, which is slower than in the B-band (∆ ln (M/LB) = (−1.46 ± 0.09)z). In the B-band the evolution has bee...
The family replication problem is addressed in the context of the dual standard model. The breaking of a simple grand unified group to [Glow × H1 × H2 × H3]/Z 3 5 and then further to Glow, produces a spectrum of stable monopoles that fall in three families each of whose magnetic quantum numbers correspond to the electric charges on the fermions of the Standard Model. Here Glow = [SU(3)×SU(2)×U(...
The authors wish to add the following amendments and corrections on their paper published in IJERPH [1]. 1. Page 3093, line 4, " spherical " and " exponential " were corrected instead of sphere and index. The sentence should read " The results obtained were then applied to the theoretical semivariogram models, including power, spherical, exponential, and Gaussian models ". The same situation in...
Four Lyman a airglow measurements of the limb and disc of Mars, made by ultraviolet spectrometers on Mariner 6 and 7 in 1969 and Mariner 9 in 1971, are analyzed to determine the amount and distribution of atomic hydrogen above 80 km. The variation of atomic hydrogen with altitude is calculated by using time-independent chemical diffusion models from 80 to 250 km, and tin exospheric model is use...
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