scholarly journals The Newtonian Model of the Smolensk Catastrophe

2020 ◽  
Vol 5 (5) ◽  
pp. 550-553
Author(s):  
Józef Pawelec
Keyword(s):  
Newtonian Model

Body Weight and the Energetics of Temperature Regulation: a Re-Examination

1972 ◽  
Vol 56 (3) ◽  
pp. 775-780
Author(s):  
WILLIAM A. CALDER ◽  
JAMES R. KING
Keyword(s):  
Body Weight ◽  
Heat Loss ◽  
Temperature Regulation ◽  
Theoretical Treatment ◽  
Newtonian Model

The Newtonian model of heat loss from homoiotherms may remain as a useful approximation of thermoregulatory relationships and as a practical basis for comparison of species from laboratory responses. The validity of this, however, has not been established or furthered by the theoretical treatment that is re-analysed in this paper.

Marx’s Economics as a Newtonian Model

2013 ◽  
pp. 123-147
Author(s):  
Michael Barratt Brown
Keyword(s):  
Newtonian Model

Non-Newtonian effects of blood on LDL transport inside the arterial lumen and across multi-layered arterial wall with and without stenosis

2016 ◽  
Vol 27 (01) ◽  
pp. 1650003
Author(s):  
Amin Deyranlou ◽  
Hamid Niazmand ◽  
Mahmood-Reza Sadeghi ◽  
Yaser Mesri
Keyword(s):  
Arterial Wall ◽  
Stokes Equations ◽  
Navier Stokes ◽  
Accurate Estimation ◽  
Ldl Transport ◽  
Arterial Lumen ◽  
Newtonian Model ◽  
Stenosis Severity ◽  
Luminal Flow ◽  
Concentration Patterns

Blood non-Newtonian behavior on low-density lipoproteins (LDL) accumulation is analyzed numerically, while fluid-multilayered arteries are adopted for nonstenotic and 30%–60% symmetrical stenosed models. Present model considers non-Newtonian effects inside the lumen and within arterial layers simultaneously, which has not been examined in previous studies. Navier–Stokes equations are solved along with the mass transport convection–diffusion equations and Darcy’s model for species transport inside the luminal flow and across wall layers, respectively. Carreau model for the luminal flow and the modified Darcy equation for the power-law fluid within arterial layers are employed to model blood rheological characteristics, appropriately. Results indicate that in large arteries with relatively high Reynolds number Newtonian model estimates LDL concentration patterns well enough, however, this model seriously incompetent for regions with low WSS. Moreover, Newtonian model for plasma underestimates LDL concentration especially on luminal surface and across arterial wall. Therefore, applying non-Newtonian model seems essential for reaching to a more accurate estimation of LDL distribution in the artery. Finally, blood flow inside constricted arteries demonstrates that LDL concentration patterns along the stenoses inside the luminal flow and across arterial layers are strongly influenced as compared to the nonstenotic arteries. Additionally, among four stenosis severity grades, 40% stenosis is prone to more LDL accumulation along the post-stenotic regions.

Study on the Influence of Non-Newtonian Characteristics on Robots for Medical Application

2010 ◽  
Vol 29-32 ◽  
pp. 857-861
Author(s):  
Jian Ping Liu ◽  
Xin Yi Zhang ◽  
Qing Xuan Jia
Keyword(s):  
Film Thickness ◽  
Elastic Deformation ◽  
Reynolds Equation ◽  
Traction Force ◽  
Elastohydrodynamic Lubrication ◽  
Medical Application ◽  
Lubrication Theory ◽  
Newtonian Model

Considering lumen elastic deformation, Reynolds equation is deduced based on non-Newtonian model in this paper. Traction force and hydrodynamic mucus film thickness are calculated according to elastohydrodynamic lubrication theory. Compared with results based on Newtonian model and experiments, analysis based on non-Newtonian model reflects practical condition well. Lumen elastic deformation has some influence on traction force and mucus film thickness.

scholarly journals Relativistic redshift of the star S0-2 orbiting the Galactic Center supermassive black hole

Science ◽  
2019 ◽  
Vol 365 (6454) ◽  
pp. 664-668 ◽  
Author(s):  
Tuan Do ◽  
Aurelien Hees ◽  
Andrea Ghez ◽  
Gregory D. Martinez ◽  
Devin S. Chu ◽  
...  
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
General Theory ◽  
Galactic Center ◽  
Statistical Significance ◽  
Gravitational Redshift ◽  
Theory Of Relativity ◽  
General Theory Of Relativity ◽  
Supermassive Black Hole ◽  
Newtonian Model

The general theory of relativity predicts that a star passing close to a supermassive black hole should exhibit a relativistic redshift. In this study, we used observations of the Galactic Center star S0-2 to test this prediction. We combined existing spectroscopic and astrometric measurements from 1995–2017, which cover S0-2’s 16-year orbit, with measurements from March to September 2018, which cover three events during S0-2’s closest approach to the black hole. We detected a combination of special relativistic and gravitational redshift, quantified using the redshift parameter ϒ. Our result, ϒ = 0.88 ± 0.17, is consistent with general relativity (ϒ = 1) and excludes a Newtonian model (ϒ = 0) with a statistical significance of 5σ.

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