scholarly journals Next-to-leading order shear viscosity inλϕ4theory

2007 ◽  
Vol 76 (10) ◽  
Author(s):  
Guy D. Moore
Keyword(s):  
Shear Viscosity ◽  
Leading Order

scholarly journals Low-Shear QCD Plasma from Perturbation Theory

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 7 ◽  
Author(s):  
Greg Jackson ◽  
André Peshier
Keyword(s):  
Perturbation Theory ◽  
Shear Viscosity ◽  
Entropy Density ◽  
Leading Order ◽  
Running Coupling ◽  
Low Shear

We argue that the inferred ratio of shear viscosity to entropy density of the quark-gluonplasma, h/s < 0.5 near the deconfinement temperature Tc, can be understood from perturbative QCD.To rebut opposite views, we first show that the existing leading order result should not be expandedin logarithms. After then settling the question of scale for the running coupling, we establish atemperature dependence of h/s which agrees well with constraints from hydrodynamics.

An Assessment of Red Cell Deformability Using a Simple Filtration Method

1979 ◽  
Author(s):  
M Drummond ◽  
G Lowe ◽  
J Belch ◽  
C Forbes ◽  
J Barbenel
Keyword(s):  
Cell Count ◽  
Shear Viscosity ◽  
White Cell Count ◽  
White Cell ◽  
Red Cell ◽  
Cell Deformability ◽  
Red Cell Deformability ◽  
Simple Method ◽  
Filtration Method ◽  
Significant Difference

We investigated the reproducibility and validity of a simple method of measuring red cell deformability (filtration of whole blood through 5 µ sieves) and its relationship to haematocrit, blood viscosity, fibrinogen, white cell count, sex and smoking. The mean coefficient of variation in normals was 3. 7%. Tanned red cells showed marked loss of deformability. Blood filtration rate correlated with haematocrit (r = 0. 99 on dilution of samples, r = 0. 7 in 120 normals and patients). After correction for haematocrit, deformability correlated with high shear viscosity, but not low shear viscosity, fibrinogen or white cell count. In 60 normals there was no significant difference between males and females, or smokers and non-smokers, but in 11 smokers there was an acute fall in deformability after smoking 3 cigarettes (p<0. 05). Reduced deformability was found in acute myocardial infarction (n = 15, p<0. 01) and chronic peripheral arterial disease (n = 15, p<0. 01). The technique is reproducible, detects rigid cells and appears useful in the study of vascular disease.

Macroscopic and molecular shear viscosity

1997 ◽  
Vol 167 (7) ◽  
pp. 721-733 ◽  
Author(s):  
Immanuil L. Fabelinskii
Keyword(s):  
Shear Viscosity
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