30,298 research outputs found
Jet measurements in pp, p--Pb and Pb--Pb collisions with ALICE at the LHC
We present a systematic study of jet measurements in pp, p--Pb and Pb--Pb
collisions using the ALICE detector at the LHC. Jet production cross sections
are measured in pp collisions at = 2.76 and 7~TeV, in p--Pb
collisions at = 5.02~TeV and in Pb--Pb collisions at
= 2.76~TeV. Jet shape observables and fragmentation
distributions are measured in pp collisions at 7~TeV. Jets are reconstructed at
midrapidity in a wide range of transverse momentum using sequential
recombination jet finding algorithms (, anti-, and
SISCone) with several values of jet resolution parameter in the range 0.2
-- 0.6. Measurements are compared to Next-to-Leading Order (NLO) perturbative
Quantum Chromodynamics (pQCD) calculations and predictions from Monte Carlo
(MC) event generators such as PYTHIA, PHOJET and HERWIG. Jet production cross
sections are well reproduced by NLO pQCD calculations in pp collisions at
~=~2.76~TeV. MC models could not explain the jet cross sections in pp
collisions at = 7 TeV, whereas jet shapes and fragmentation
distributions are rather well reproduced by these models. The jet nuclear
modification factor in p--Pb collisions is found to be consistent
with unity indicating the absence of large modifications of the initial parton
distribution or strong final state effects on jet production, whereas a large
jet suppression is observed in Pb--Pb central events with respect to peripheral
events indicating formation of a dense medium in central Pb--Pb events.Comment: 6 pages, 5 figures, 7th International Conference on Physics and
Astrophysics of Quark Gluon Plasma, 1-5 February, 2015, Kolkata, Indi
Asynchronous Early Output Dual-Bit Full Adders Based on Homogeneous and Heterogeneous Delay-Insensitive Data Encoding
This paper presents the designs of asynchronous early output dual-bit full
adders without and with redundant logic (implicit) corresponding to homogeneous
and heterogeneous delay-insensitive data encoding. For homogeneous
delay-insensitive data encoding only dual-rail i.e. 1-of-2 code is used, and
for heterogeneous delay-insensitive data encoding 1-of-2 and 1-of-4 codes are
used. The 4-phase return-to-zero protocol is used for handshaking. To
demonstrate the merits of the proposed dual-bit full adder designs, 32-bit
ripple carry adders (RCAs) are constructed comprising dual-bit full adders. The
proposed dual-bit full adders based 32-bit RCAs incorporating redundant logic
feature reduced latency and area compared to their non-redundant counterparts
with no accompanying power penalty. In comparison with the weakly indicating
32-bit RCA constructed using homogeneously encoded dual-bit full adders
containing redundant logic, the early output 32-bit RCA comprising the proposed
homogeneously encoded dual-bit full adders with redundant logic reports
corresponding reductions in latency and area by 22.2% and 15.1% with no
associated power penalty. On the other hand, the early output 32-bit RCA
constructed using the proposed heterogeneously encoded dual-bit full adder
which incorporates redundant logic reports respective decreases in latency and
area than the weakly indicating 32-bit RCA that consists of heterogeneously
encoded dual-bit full adders with redundant logic by 21.5% and 21.3% with nil
power overhead. The simulation results obtained are based on a 32/28nm CMOS
process technology
Latency Optimized Asynchronous Early Output Ripple Carry Adder based on Delay-Insensitive Dual-Rail Data Encoding
Asynchronous circuits employing delay-insensitive codes for data
representation i.e. encoding and following a 4-phase return-to-zero protocol
for handshaking are generally robust. Depending upon whether a single
delay-insensitive code or multiple delay-insensitive code(s) are used for data
encoding, the encoding scheme is called homogeneous or heterogeneous
delay-insensitive data encoding. This article proposes a new latency optimized
early output asynchronous ripple carry adder (RCA) that utilizes single-bit
asynchronous full adders (SAFAs) and dual-bit asynchronous full adders (DAFAs)
which incorporate redundant logic and are based on the delay-insensitive
dual-rail code i.e. homogeneous data encoding, and follow a 4-phase
return-to-zero handshaking. Amongst various RCA, carry lookahead adder (CLA),
and carry select adder (CSLA) designs, which are based on homogeneous or
heterogeneous delay-insensitive data encodings which correspond to the
weak-indication or the early output timing model, the proposed early output
asynchronous RCA that incorporates SAFAs and DAFAs with redundant logic is
found to result in reduced latency for a dual-operand addition operation. In
particular, for a 32-bit asynchronous RCA, utilizing 15 stages of DAFAs and 2
stages of SAFAs leads to reduced latency. The theoretical worst-case latencies
of the different asynchronous adders were calculated by taking into account the
typical gate delays of a 32/28nm CMOS digital cell library, and a comparison is
made with their practical worst-case latencies estimated. The theoretical and
practical worst-case latencies show a close correlation....Comment: arXiv admin note: text overlap with arXiv:1704.0761
Thymoma with Myasthenia Gravis in Adolescent
Thymomas are exceedingly rare in the first 20 years of life, Thymic lesions comprise approximately 2–3% of all pediatric mediastinal tumors and include thymic cysts, hyperplasia, carcinoma, and thymomas. Fewer than 30 cases in children have been described in the literature. Thymomas in adults are commonly associated with other diseases, the most frequent being myasthenia gravis. However, this association has been rarely reported in childhood. These tumors are typically aggressive, with poor outcomes. We report a case of thymoma associated with myasthenia gravis in a 16-year-old girl and review the literature
Eigenfunctions of the Laplace-Beltrami Operator on Hyperboloids
Eigenfunctions of the Laplace-Beltrami operator on a hyperboloid are studied
in the spirit of the treatment of the spherical harmonics by Stein and Weiss.
As a special case, a simple self-contained proof of Laplace's integral for a
Legendre function is obtained.Comment: 5 page
Shorted Operators Relative to a Partial Order in a Regular Ring
In this paper, the explicit form of maximal elements, known as shorted
operators, in a subring of a von Neumann regular ring has been obtained. As an
application of the main theorem, the unique shorted operator (of electrical
circuits) which was introduced by Anderson-Trapp has been derived.Comment: There was a small mistake in the published version which has been
corrected her
Predoctoral Dental Students’ Perceptions of Dental Implant Training: Effect of Preclinical Simulation and Clinical Experience
The aims of this study were to assess 1) differences in perceptions of dental implant training between dental students who received didactic training alone (control group) and those who received didactic plus simulation training (test group); 2) differences in response between students with and without clinical experience in implant dentistry; and 3) the interaction effect of simulation training and clinical experience on students’ satisfaction. A survey was distributed to the control group in 2014 and to the test group in 2015; both groups were at the same U.S. dental school. Data were collected on confidence levels with various implant restorative procedures along with overall satisfaction and number of implant restorations performed by each student. The response rate was 78.7% in the control group and 81.3% in the test group. In the control group, 85.7% of students reported being satisfied with implant training compared to 90.8% of students in the test group. The interaction effect of simulation training and clinical experience on overall student satisfaction was OR=1.5 at 95% CI: 0.8, 3.0. The students who had clinical experience with implant restorative procedures had significantly greater satisfaction than those who did not (OR=4.8, 95% CI: 2.1, 11.1,
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