593 research outputs found
Leptonic decay constants for D-mesons from 3-flavour CLS ensembles
We report on the status of an ongoing effort by the RQCD and ALPHA
Collaborations, aimed at determining leptonic decay constants of charmed
mesons. Our analysis is based on large-volume ensembles generated within the
CLS effort, employing N_f=2+1 non-perturbatively O(a) improved Wilson quarks,
tree-level Symanzik-improved gauge action and open boundary conditions. The
ensembles cover lattice spacings from a ~ 0.09 fm to a ~ 0.05 fm, with pion
masses varied from 420 to 200 MeV. To extrapolate to the physical masses, we
follow both the 2m_l+m_s=const. and the m_s=const. lines in parameter space.Comment: 8 pages including figures and tables, latex2e; Proceedings of the
35th International Symposium on Lattice Field Theory (Lattice 2017), 18-24
June 2017, Granada, Spai
Integration Through Separation - The Role of Lateral Membrane Segregation in Nutrient Uptake
Nutrient transporters are prominent and ubiquitous components of the plasma membrane in all cell types. Their expression and regulation are tightly linked to the cells' needs. Environmental factors such as nutrient starvation or osmotic stress prompt an acute remodeling of transporters and the plasma membrane to efficiently maintain homeostasis in cell metabolism. Lateral confinement of nutrient transporters through dynamic segregation within the plasma membrane has recently emerged as an important phenomenon that facilitates spatiotemporal control of nutrient uptake and metabolic regulation. Here, we review recent studies highlighting the mechanisms connecting the function of amino acid permeases with their endocytic turnover and lateral segregation within the plasma membrane. These findings indicate that actively controlled lateral compartmentalization of plasma membrane components constitutes an important level of regulation during acute cellular adaptations.This work was supported by the German Research Foundation (SFB944, SFB1348, and WE2750/4-1 to RW-S) and the Cellsin-Motion Cluster of Excellence (EXC1003-CiM, University of Munster to RW-S). JVB was supported by a postdoctoral fellowship from the Basque Government
On the magnetic equation of state in (2+1)-flavor QCD
A first study of critical behavior in the vicinity of the chiral phase
transition of (2+1)-flavor QCD is presented. We analyze the quark mass and
volume dependence of the chiral condensate and chiral susceptibilities in QCD
with two degenerate light quark masses and a strange quark. The strange quark
mass (m_s) is chosen close to its physical value; the two degenerate light
quark masses (m_l) are varied in a wide range 1/80 \le m_l/m_s \le 2/5, where
the smallest light quark mass value corresponds to a pseudo-scalar Goldstone
mass of about 75 MeV. All calculations are performed with staggered fermions on
lattices with temporal extent Nt=4. We show that numerical results are
consistent with O(N) scaling in the chiral limit. We find that in the region of
physical light quark mass values, m_l/m_s \simeq 1/20, the temperature and
quark mass dependence of the chiral condensate is already dominated by
universal properties of QCD that are encoded in the scaling function for the
chiral order parameter, the magnetic equation of state. We also provide
evidence for the influence of thermal fluctuations of Goldstone modes on the
chiral condensate at finite temperature. At temperatures below, but close to
the chiral phase transition at vanishing quark mass, this leads to a
characteristic dependence of the light quark chiral condensate on the square
root of the light quark mass.Comment: 18 pages, 18 EPS-file
Towards Open Innovation in Embedded Systems
By opening up a technology, firms can incorporate external actors to improve their products or to develop new applications on top of it. This phenomenon is discussed in the literature as open innovation (Chesbrough, 2003). An embedded system is an example of a modular and traditionally closed technology where parts of the system can be opened in order to stimulate innovation. In this paper, we want to explore how firms can pursue the opening of their embedded systems and their organization in order to unleash the potential of open innovation. By conducting twelve explorative interviews with experts in the field of embedded systems, we discovered three different forms of embedded systems openness and explored technical, internal and external organizational challenges associated with these three forms of openness
Conserved Charge Fluctuations from Lattice QCD and the Beam Energy Scan
We discuss the next-to-leading order Taylor expansion of ratios of cumulants
of net-baryon number fluctuations. We focus on the relation between the
skewness ratio, , and the kurtosis ratio,
. We show that differences in these two
cumulant ratios are small for small values of the baryon chemical potential.
The next-to-leading order correction to however is
approximately three times larger than that for . The former thus
drops much more rapidly with increasing beam energy, . We argue
that these generic patterns are consistent with current data on cumulants of
net-proton number fluctuations measured by the STAR Collaboration at
~GeV.Comment: 4 pages, 4 figures, contribution to the Quark Matter 2015 proceeding
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