3,224 research outputs found
QCD Physics with ZEUS and H1 at HERA
A review is presented of recent results in QCD from the H1 and ZEUS
experiments at HERA, emphasizing the use of higher order calculations to
describe the data.Comment: 12 pages, 15 figures, invited review paper for Mod. Phys. Lett
On the mistake in the implementation of the minimal model of the dual parameterization and resulting inability to describe the high-energy DVCS data
We correct the mistaken claim made in \cite{Guzey:2005ec,Guzey:2006xi} that
the minimal model of the dual parameterization of nucleon generalized parton
distributions (GPDs) gives a good, essentially model-independent description of
high-energy data on deeply virtual Compton scattering (DVCS). In the
implementation of the dual parameterization in
\cite{Guzey:2005ec,Guzey:2006xi}, the numerical prefactor of two in front of
the DVCS amplitude was missing. We show that the corrected minimal model of the
dual parameterization significantly overestimates the HERA data (H1 and ZEUS)
on the DVCS cross section.Comment: 8 pages, 1 figur
A Low-Complexity Graph-Based LMMSE Receiver Designed for Colored Noise Induced by FTN-Signaling
We propose a low complexity graph-based linear minimum mean square error
(LMMSE) equalizer which considers both the intersymbol interference (ISI) and
the effect of non-white noise inherent in Faster-than-Nyquist (FTN) signaling.
In order to incorporate the statistics of noise signal into the factor graph
over which the LMMSE algorithm is implemented, we suggest a method that models
it as an autoregressive (AR) process. Furthermore, we develop a new mechanism
for exchange of information between the proposed equalizer and the channel
decoder through turbo iterations. Based on these improvements, we show that the
proposed low complexity receiver structure performs close to the optimal
decoder operating in ISI-free ideal scenario without FTN signaling through
simulations.Comment: 6 pages, 6 figures, IEEE Wireless Communications and Networking
Conference 2014, Istanbul, Turke
FLASH: ultra-fast protocol to identify RNA-protein interactions in cells
Determination of the in vivo binding sites of RNA-binding proteins (RBPs) is paramount to understanding their function and how they affect different aspects of gene regulation. With hundreds of RNA-binding proteins identified in human cells, a flexible, high-resolution, high-throughput, highly multiplexible and radioactivity-free method to determine their binding sites has not been described to date. Here we report FLASH (Fast Ligation of RNA after some sort of Affinity Purification for High-throughput Sequencing), which uses a special adapter design and an optimized protocol to determine protein-RNA interactions in living cells. The entire FLASH protocol, starting from cells on plates to a sequencing library, takes 1.5 days. We demonstrate the flexibility, speed and versatility of FLASH by using it to determine RNA targets of both tagged and endogenously expressed proteins under diverse conditions in vivo
The effect of sample properties on the electron velocity in quantum Hall bars
We report on our theoretical investigation of the effects of the confining
potential profile and sample size on the electron velocity distribution in
(narrow) quantum-Hall systems. The electrostatic properties of the electron
system are obtained by the Thomas-Fermi-Poisson nonlinear screening theory. The
electron velocity distribution as a function of the lateral coordinate is
obtained from the slope of the screened potential at the Fermi level and within
the incompressible strips (ISs). We compare our findings with the recent
experiments.Comment: 8 pages, 6 figure
A forward looking age based on longevity expectations
Many personal decisions are shaped by people's expectations of the future, but these expectations are rarely included in the study of those decisions. Often, studies that analyze these forward-looking decisions use chronological age, an inherently backward-looking measure, as a proxy for those expectations. In this paper, we use a two part methodology to compute a forward-looking age which is based on data of longevity expectations collected in the Health and Retirement Study (HRS). In the first part, we propose a method to translate those expectations into life tables. In the second part, those life tables are used to produce forward-looking ages that can be used in the study of forward-looking decisions. We find that education has a great effect on subjective life expectancy, therefore on forward-looking age. Also, we observe that at any given education level, the forward-looking age of the younger cohort is always greater than or equal to the forward-looking age of the older cohort. Finally, the difference between forward-looking age chronological age is increasing as individuals get older, but the speed of this change varies depending on education level, cohort and health-related conditions
Seismic performance evaluation of traditional timber hımış frames: capacity spectrum method based assessment
Timber constructions have been widely suggested to be seismically resistant based on post-disaster reconnaissance studies. This observation has, however, remained to a large extent anecdotal due to the lack of experimental work supporting it, especially for certain timber architectural forms, including traditional timber frame “hımış” structures. To fill this gap, the authors carried out an extensive full-scale testing scheme using frames of various geometrical configurations, tested under reverse-cyclic lateral loading with/without infill (brick and adobe) or cladding (bağdadi and şamdolma) (Aktas et al. in Earthq Spectra 30(4):1711–1732, 2014a, b). The tests concluded that hımış frames had high energy dissipation capabilities due mostly to nailed connections. Infill/cladding significantly helped improve stiffness and lateral load strength of the frames, and timber type did not seem to make a remarkable impact on the overall behaviour. The current paper, on the other hand, uses test data to calculate capacity/demand ratios based on capacity spectrum method and Eurocode 8 to elaborate more on the performance of “hımış” structures under seismic loading. The obtained results are discussed to draw important conclusions with regards to how frame geometry and infill/cladding techniques affect the overall performance
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