نتایج جستجو برای: روش هیدرودینامیک ذرات هموار sph

تعداد نتایج: 380217  

Journal: :J. Comput. Physics 2008
Daniel J. Price

In this paper we discuss the treatment of discontinuities in Smoothed Particle Hydrodynamics (SPH) simulations. In particular we discuss the difference between integral and differential representations of the fluid equations in an SPH context and how this relates to the formulation of dissipative terms for the capture of shocks and other discontinuities. This has important implications for many...

  Background: Health status is an individual’s relative level of wellness and illness. Self-Perceived Health (SPH) is a single item considered as a health indicator for national and international survey. The aim of this study was to evaluate the SPH measure and its determinants in a National sample of Iranian children and adolescents.   Materials and Methods:  This National study was performed...

1995
A. N. Kuznetsov P. G. Tinyakov

We calculate numerically the probability exp[ 1 λ F (E/E sph , N/N sph)] of the false vacuum decay in the massive four-dimensional −λφ 4 model from multipar-ticle initial states with fixed number of particles N and energy E greater than the height of the barrier E sph. We find that at E ∼ < 3E sph and N ∼ < 0.4N sph the decay is classically forbidden and thus is exponentially suppressed. We arg...

2016
T. Weaver Z. Xiao

This paper presents a survey of Smoothed Particle Hydrodynamics (SPH) and its use in computational fluid dynamics. As a truly mesh-free particle method based upon the Lagrangian formulation, SPH has been applied to a variety of different areas in science, computer graphics and engineering. It has been established as a popular technique for fluid based simulations, and has been extended to succe...

1998
PETER BERCZIK

A new Chemo – Dynamical Smoothed Particle Hydrodynamic (CD – SPH) code is presented. The disk galaxy is described as a multi – fragmented gas and star system, embedded into the cold dark matter halo. The star formation (SF) process, SNII, SNIa and PN events as well as chemical enrichment of gas have been considered within the framework of standard SPH model. Using this model we try to describe ...

Journal: :The Journal of Cell Biology 1995
K E Bornfeldt L M Graves E W Raines Y Igarashi G Wayman S Yamamura Y Yatomi J S Sidhu E G Krebs S Hakomori

Activation of the PDGF receptor on human arterial smooth muscle cells (SMC) induces migration and proliferation via separable signal transduction pathways. Sphingosine-1-phosphate (Sph-1-P) can be formed following PDGF receptor activation and therefore may be implicated in PDGF-receptor signal transduction. Here we show that Sph-1-P does not significantly affect PDGF-induced DNA synthesis, prol...

Journal: :The Biochemical journal 2004
Elisabetta Meacci Francesca Cencetti Chiara Donati Francesca Nuti Laura Becciolini Paola Bruni

Sphingosine (Sph) has been implicated as a modulator of membrane signal transduction systems and as a regulatory element of cardiac and skeletal muscle physiology, but little information is presently available on its precise mechanism of action. Recent studies have shown that sphingosine 1-phosphate (S1P), generated by the action of sphingosine kinase (SphK) on Sph, also possesses biological ac...

Journal: :British journal of health psychology 2006
Roberto J Rona Richard Hooper Claire French Margaret Jones Simon Wessely

OBJECTIVES We assessed the characteristics of self-perception of health (SPH) in relation to psychological distress and physical symptoms, and willingness of servicemen to see their Medical Officer (MO) by their SPH rating. DESIGN We randomly selected 4,500 servicemen to receive either a full or an abridged screening questionnaire. MEASURES The full questionnaire included 6 items from the s...

Journal: :Drug metabolism and pharmacokinetics 2010
Osamu Ueda Taro Uchiyama Masaya Nakashima

In this study, (3)H- or (13)C(2),D(2)-sphingosine (SPH) was orally administered to mice to assess absorption, mass balance, tissue distribution, and metabolites in the skin. The blood concentration of (3)H-SPH showed a Tmax of 10.7 hr. The radioactivity in the skin reached 763.4 ng eq./g tissue at 12 hr, and decreased to 181.7 ng eq./g tissue at 168 hr. The concentration of radioactivity at 12 ...

H.G. Shivakumar N. Vishal Gupta,

   The objective of the present study is to develop and investigate the swelling behavior of pH-sensitive Superporous Hydrogel (SPH) and SPH composite (SPHC). A novel superporous hydrogel containing poly (methacrylic acid-co-acrylamide) was synthesized from methacrylic acid and acrylamide through the aqueous solution polymerization, using N,N-methylenebisacrylamide as a crosslinker and ammonium...

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