8 research outputs found
The eccentricity in heavy-ion collisions from Color Glass Condensate initial conditions
The eccentricity in coordinate-space at midrapidity of the overlap zone in
high-energy heavy-ion collisions predicted by the -factorization
formalism is generically larger than expected from scaling with the number of
participants. We provide a simple qualitative explanation of the effect which
shows that it is not caused predominantly by edge effects. We also show that it
is quite insensitive to ``details'' of the unintegrated gluon distribution
functions such as the presence of leading-twist shadowing and of an extended
geometric scaling window. The larger eccentricity increases the azimuthal
asymmetry of high transverse momentum particles. Finally, we point out that the
longitudinal structure of the Color Glass Condensate initial condition for
hydrodynamics away from midrapidity is non-trivial but requires understanding
of large- effects.Comment: 8 pages, 7 figures; v3: added note regarding Qs2~n_part versus
Qs2~T_A, final version to appear in PR
Collisional dissociation of heavy mesons in dense QCD matter
In the framework of the reaction operator approach we calculate and resum the
multiple elastic scattering of a fast system traversing dense
nuclear matter. We derive the collisional broadening of the meson's transverse
momentum and the distortion of its intrinsic light cone wave function. The
medium-induced dissociation probability of heavy mesons is shown to be
sensitive to the opacity of the quark-gluon plasma and the time dependence of
its formation and evolution. We solve the system of coupled rate equations that
describe the competition between the fragmentation of - and -quarks and
the QGP-induced dissociation of the - and -mesons to evaluate the
quenching of heavy hadrons in nucleus-nucleus collisions. In contrast to
previous results on heavy quark modification, this approach predicts
suppression of -mesons comparable to that of -mesons at transverse
momenta as low as GeV. It allows for an improved description of
the large attenuation of non-photonic electrons in central Au+Au reactions at
RHIC.Comment: 8 pages, 5 figures. Figures and references updated, typos corrected.
As published in Phys.Lett.
Constructing understanding through critical questioning: A comparative study of first year undergraduate and postgraduate writing and communication classes
Asian Journal of the Scholarship of Teaching and Learning9159-69Singapor
Faculty-Librarian Collaboration for Teaching Digital Information Literacy Online: Case Study of a Large General Education Course
10.25540/68pr-pzdkAsian Journal of the Scholarship of Teaching and Learning131170-18
Musings From an Inaugural Bachelor of Pharmacy Curriculum: Teaching of Health Advocacy via Integration of Topics
Asian Journal of the Scholarship of Teaching and Learning1280-8
Changing Characteristics and Mode of Death Associated With Chronic Heart Failure Caused by Left Ventricular Systolic Dysfunction
Background— Therapies for patients with chronic heart failure caused by left ventricular systolic dysfunction have advanced substantially over recent decades. The cumulative effect of these therapies on mortality, mode of death, symptoms, and clinical characteristics has yet to be defined. Methods and Results— This study was a comparison of 2 prospective cohort studies of outpatients with chronic heart failure caused by left ventricular systolic dysfunction performed between 1993 and 1995 (historic cohort: n=281) and 2006 and 2009 (contemporary cohort: n=357). In the historic cohort, 83% were prescribed angiotensin-converting enzyme inhibitors and 8.5% were prescribed β-adrenoceptor antagonists, compared with 89% and 80%, respectively, in the contemporary cohort. Mortality rates over the first year of follow-up declined from 12.5% to 7.8% between eras ( P =0.04), and sudden death contributed less to contemporary mortality (33.6% versus 12.7%; P <0.001). New York Heart Association class declined between eras ( P <0.001). QTc dispersion across the chest leads declined from 85 ms (SD, 2) to 34 ms (SD, 1) and left ventricular end-diastolic dimensions declined from 65 mm (SD, 0.6) to 59 mm (SD, 0.5) (both P <0.001). Conclusions— Survival has significantly improved in patients with chronic heart failure caused by left ventricular systolic dysfunction over the past 15 years; furthermore, sudden death makes a much smaller contribution to mortality, and noncardiac mortality is a correspondingly greater contribution. This has been accompanied by an improvement in symptoms and some markers of adverse electric and structural left ventricular remodeling. </jats:sec