scholarly journals INTERMITTENCY AND BOSE-EINSTEIN CORRELATIONS

1995 ◽  
Vol 10 (28) ◽  
pp. 3951-3983 ◽  
Author(s):  
I.V. ANDREEV ◽  
I.M. DREMIN ◽  
M. BIYAJIMA ◽  
N. SUZUKI
Keyword(s):  
Phase Space ◽  
Small Cells ◽  
Factorial Moments ◽  
Particle Correlations ◽  
Bose Einstein ◽  
Different Origins

The role of Bose-Einstein (BE) correlations in a widely discussed intermittency phenomenon is reviewed. In particular, it is shown that particle correlations of different origins are better displayed when analyzed as functions of appropriately chosen variables. Correspondingly, if the shape of the BE contribution is chosen to be Gaussian in three-momentum transferred, it provides the power-like law in four-momentum squared and is smeared out in (pseudo)rapidity. The increase in factorial moments in small cells of the phase space looks also different in different variables, which is ascribed to varying shares of various mechanisms of both dynamical (e.g. parton jets) and symmetry (BE correlations) origin.

scholarly journals On Boundedness of Entropy of Photon Gas in Noncommutative Spacetime

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Kazi Ashraful Alam ◽  
Mir Mehedi Faruk
Keyword(s):  
Black Holes ◽  
Distribution Function ◽  
Phase Space ◽  
Partition Function ◽  
Boltzmann Distribution ◽  
Einstein Distribution ◽  
Entropy Bound ◽  
Photon Gas ◽  
Noncommutative Spacetime ◽  
Bose Einstein

Entropy bound for the photon gas in a noncommutative (NC) spacetime where phase space is with compact spatial momentum space, previously studied by Nozari et al., has been reexamined with the correct distribution function. While Nozari et al. have employed Maxwell-Boltzmann distribution function to investigate thermodynamic properties of photon gas, we have employed the correct distribution function, that is, Bose-Einstein distribution function. No such entropy bound is observed if Bose-Einstein distribution is employed to solve the partition function. As a result, the reported analogy between thermodynamics of photon gas in such NC spacetime and Bekenstein-Hawking entropy of black holes should be disregarded.

scholarly journals Role of phase space structures in collisionless drift wave turbulence and impact on transport modeling

2017 ◽  
Vol 57 (7) ◽  
pp. 072006 ◽  
Author(s):  
Y. Kosuga ◽  
S.-I. Itoh ◽  
P.H. Diamond ◽  
K. Itoh ◽  
M. Lesur
Keyword(s):  
Phase Space ◽  
Transport Modeling ◽  
Space Structures ◽  
Wave Turbulence ◽  
Drift Wave Turbulence ◽  
Drift Wave

Abstract P034: Bone Marrow--Derived Cells Are Not an Essential Component in Cardiosphere Formation

2011 ◽  
Vol 109 (suppl_1) ◽  
Author(s):  
Jianqin Ye ◽  
Andrew Boyle ◽  
Yerem Yeghiazarians
Keyword(s):  
Myocardial Infarction ◽  
Bone Marrow ◽  
Progenitor Cells ◽  
Small Cells ◽  
Immunomagnetic Beads ◽  
Cell Component ◽  
Post Surgery ◽  
C57bl Mice ◽  
Bone Marrow Derived Cells

Background: Cardiospheres (CS) are composed of heterogeneous population of cells but it is unknown whether bone marrow derived cells are an essential cell component in CS formation. Methods: Chimera mice were generated by transplantation of bone morrow cells from GFP transgenic mice to irradiated C57BL mice. Mice were randomized into 3 groups 5 months after transplantation: 1) myocardial infarction; 2) sham operated; 3) un-operated (n=5/group). Hearts were harvested 2-weeks post-surgery. Cardiac explants were cultured and putative cardiosphere forming cells (CFCs) (small cells migrating out from the explants) were collected 14 days later and reseeded on new culture dishes for CS formation. The number of CS from each heart was counted at 3 days. CS cell composition was analyzed by FACS. To further analyze the role of bone marrow derived CD45+ cells in forming CS, CD45+ cells was isolated from CFCs by CD45 antibody coated immunomagnetic beads. The number of CS formed from 1×10 5 putative CFCs, CFCs without CD45+ cells and CD45+ cells from CFCs (n=6-9/cell type) respectively were also counted at 3 days in culture. Results: Compared to sham (122± 23/heart) and un-operated hearts (18± 5/heart), infarcted hearts formed more CS (357± 64/heart, P<0.01). In all groups, irrespective of any surgery, 18.4± 4.5% of cells in CS co-expressed GFP and CD45, indicating they originated in bone marrow. Low percentage of bone marrow stem/progenitor cells (3.9% Sca-1+GFP+CD45+ and 1% c-Kit+GFP+CD45+ cells) were detected in CS, but a high percentage of cells within CS were cardiac stem/progenitor cells (26.3± 9.4% cells were Sca-1+GFP-CD45-, 0.10± 0.04% c-Kit+GFP-CD45-). Depleting CD45+ cells from putative CFCs actually increased the formation of CS (67±10 CS/1×10 5 cells) compared to un-depleted CFCs (51± 6 CS/1×10 5 cells, P<0.0001). Purified CD45+ cells from CFCs did not form CS in culture. Conclusion: Myocardial infarction increases the formation of CS in culture. Bone marrow derived CD45+ cells make up a small percentage of CS, but are not necessary for CS formation.

scholarly journals Digital Technologies and Selective Exposure: How Choice and Filter Bubbles Shape News Media Exposure

2019 ◽  
Vol 24 (4) ◽  
pp. 465-486 ◽  
Author(s):  
Ana S. Cardenal ◽  
Carlos Aguilar-Paredes ◽  
Carol Galais ◽  
Mario Pérez-Montoro
Keyword(s):  
News Media ◽  
Media Exposure ◽  
Digital Technologies ◽  
Selective Exposure ◽  
Political Interest ◽  
Complex Picture ◽  
Filter Bubbles ◽  
Different Origins ◽  
The Relationship

This paper analyzes the role of different origins to news media in selective exposure. We rely on a unique web-tracking online dataset from Spain to identify points of access to news outlets and study the influence of direct navigation and news-referred platforms (i.e., from Facebook and Google) on selective exposure. We also explore cross-level interactions between origins to news and political interest and ideology. We find that direct navigation increases selective exposure while Google reduces it. We also find that the relationship between origins to news and selective exposure is strongly moderated by ideology, suggesting that search engines and social media are not content neutral. Our findings suggest a rather complex picture regarding selective exposure online.

Invariance Groups in Classical and Quantum Mechanics

1973 ◽  
Vol 28 (3-4) ◽  
pp. 538-540 ◽  
Author(s):  
D. J. Simms
Keyword(s):  
Quantum Mechanics ◽  
Phase Space ◽  
Energy Levels ◽  
Classical Mechanics ◽  
Symmetry Groups ◽  
Casimir Invariants ◽  
Classical Phase Space ◽  
Invariance Groups ◽  
Classical And Quantum Mechanics

AbstractThis is a report on some new relations and analogies between classical mechanics and quantum mechanics which arise out of the work of Kostant and Souriau. Topics treated are i) the role of symmetry groups; ii) the notion of elementary system and the role of Casimir invariants; iii) energy levels; iv) quantisation in terms of geometric data on the classical phase space. Some applications are described.

scholarly journals The Role of Foreign Credentials and Ethnic Ties in Immigrants’ Economic Performance

2008 ◽  
Vol 33 (2) ◽  
Author(s):  
Peter S Li
Keyword(s):  
Social Capital ◽  
Economic Performance ◽  
Ethnic Diversity ◽  
Strong Ties ◽  
Men And Women ◽  
Two Factors ◽  
Negative Effect ◽  
Different Origins ◽  
Immigrant Men

The literature has identified foreign credential devaluations and the shifting origins of immigrants to non-European sources as two factors that explain why some immigrants earn more than others. This study uses data from the Ethnic Diversity Survey to see how foreign credentials affect immigrants’ earnings, and whether immigrants with disadvantaged foreign credentials may be able to use ethnic social capital to mitigate the negative effect. Substantial gross earnings disparities exist among immigrant men and women of different origins, but much difference is due to human capital variations and duration of work. The study produces three major findings. First, foreign credentials benefit majority member immigrants but penalize visible minority immigrants. Second, immigrant men and women who maintain weak ethnic ties earn more than their counterparts with strong ties, suggesting that the enabling capacity of social capital for immigrants has been overstated. Third, there is no evidence of ethnic social capital being able to mitigate the negative effect of a credential deficit.

The Role of Massive MIMO and Small Cells in Ultra-dense Networks

2019 ◽  
pp. 113-133 ◽  
Author(s):  
Qi Zhang ◽  
Howard H. Yang ◽  
Tony Q. S. Quek
Keyword(s):  
Massive Mimo ◽  
Small Cells ◽  
Dense Networks
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