2,946 research outputs found
Non-minimal Derivative Coupling Scalar Field and Bulk Viscous Dark Energy
Inspired by thermodynamical dissipative phenomena, we consider bulk viscosity
for dark fluid in a spatially flat two-component Universe. Our viscous dark
energy model represents Phantom crossing avoiding Big-Rip singularity. We
propose a non-minimal derivative coupling scalar field with zero potential
leading to accelerated expansion of Universe in the framework of bulk viscous
dark energy model. In this approach, coupling constant () is related to
viscosity coefficient () and energy density of dark energy at the
present time (). This coupling is bounded as and for leads to . To
perform robust analysis, we implement recent observational data sets including
Joint Light-curve Analysis (JLA) for SNIa, Gamma Ray Bursts (GRBs) for most
luminous astrophysical objects at high redshifts, Baryon Acoustic Oscillations
(BAO) from different surveys, Hubble parameter from HST project, {\it Planck}
data for CMB power spectrum and CMB Lensing. Joint analysis of
JLAGRBsBAOHST shows that ,
and at confidence interval.
{\it Planck} TT observation provides at
confidence limit for viscosity coefficient. Tension in Hubble parameter is
alleviated in this model. Cosmographic distance ratio indicates that current
observed data prefer to increase bulk viscosity. Finally, the competition
between Phantom and Quintessence behavior of viscous dark energy model can
accommodate cosmological old objects reported as a sign of age crisis in
CDM model.Comment: 21 pages and 18 figures, some typos in equations fixe
Design and analysis of a novel low PDP full adder cell
This paper, presents a new full-swing low power high performance full adder circuit in CMOS technology. It benefits from a full swing XOR-XNOR module with no feedback transistors, which decreases delay and power consumption. In addition, high driving capability of COUT module and low PDP design of SUM module contribute to more PDP reduction in cascaded mode. In order to have accurate analysis, the new circuit along with several well-known full adders from literature have been modeled and compared with CADENCE. Comparison consists of power consumption, performance, PDP, and area. Results show that there are improvements in both power consumption and performance. This design trades area with low PDP
Mutually Uncorrelated Primers for DNA-Based Data Storage
We introduce the notion of weakly mutually uncorrelated (WMU) sequences,
motivated by applications in DNA-based data storage systems and for
synchronization of communication devices. WMU sequences are characterized by
the property that no sufficiently long suffix of one sequence is the prefix of
the same or another sequence. WMU sequences used for primer design in DNA-based
data storage systems are also required to be at large mutual Hamming distance
from each other, have balanced compositions of symbols, and avoid primer-dimer
byproducts. We derive bounds on the size of WMU and various constrained WMU
codes and present a number of constructions for balanced, error-correcting,
primer-dimer free WMU codes using Dyck paths, prefix-synchronized and cyclic
codes.Comment: 14 pages, 3 figures, 1 Table. arXiv admin note: text overlap with
arXiv:1601.0817
- …