809 research outputs found
Analisis Kemampuan Anak Membaca Permulaan di Kelompok B Tk Mujahidin II
The general question in this research is how a child \u27s ability to read starters in group B. This study aims to determine the ability of children in group B read starters. This research was conducted in group B TK Mujahidin II, with a sample of 15 children. The method used is a qualitative research, with data collection techniques and tools: direct observation techniques by means of observation guide, direct communication techniques by means of interview, and documentary techniques with documentation tools. The results of data analysis showed that children\u27s ability to read starters in Group B, in the category enough, which means the ability of a child to read starters have been developed according to expectations on the percentage of 73.42 %
Towards a large-area RPWELL detector: design optimization and performance
We present a new design and assembly procedure of a large-area gas-avalanche
Resistive-Plate WELL (RPWELL) detector. A prototype
was tested in muon beam at CERN-SPS, presenting improved
performances compared to previous ones: MIP detection efficiency over 96\% with
3\% uniformity across the entire detector area, a charge gain of
with a uniformity of 22\%, and discharge
probability below with a few single hotspots attributed to
production imperfections. These results pave the way towards further up-scaling
detectors of this kind
On the algorithmic construction of classifying spaces and the isomorphism problem for biautomatic groups
We show that the isomorphism problem is solvable in the class of central
extensions of word-hyperbolic groups, and that the isomorphism problem for
biautomatic groups reduces to that for biautomatic groups with finite centre.
We describe an algorithm that, given an arbitrary finite presentation of an
automatic group , will construct explicit finite models for the skeleta
of and hence compute the integral homology and cohomology of
.Comment: 21 pages, 4 figure
P09-11. Reduced replication capacity of NL4-3 chimeric viruses encoding RT-Integrase sequences from HIV-1 elite controllers
Background: Spontaneous control of HIV to 0.05). Viruses derived from HLA-B57+ EC (N = 20) appeared to replicate slower than those from B57+ progressors (N = 8) (p = 0.004). Similar results were observed between B51+ EC (N = 4) and B51+ progressors (N = 10) (p = 0.024), but not between B27+ EC (N = 9) and B27+ progressors (N = 5) (p = 0.437). Conclusion: This study extends previous observations for Gag and demonstrates that Pol variants from EC also display reduced function. The association between fitness and expression of certain HLA that present Pol epitopes suggests that immune-mediated mutations impairing viral fitness may play a key role in spontaneous control of HIV. Results indicate that HLA alleles responsible for such defects in protein function may differ among viral genes. Further identification of HLA-associated changes in HIV may allow design of vaccines targeting the most vulnerable regions of the virus
Cooling dynamics of a dilute gas of inelastic rods: a many particle simulation
We present results of simulations for a dilute gas of inelastically colliding
particles. Collisions are modelled as a stochastic process, which on average
decreases the translational energy (cooling), but allows for fluctuations in
the transfer of energy to internal vibrations. We show that these fluctuations
are strong enough to suppress inelastic collapse. This allows us to study large
systems for long times in the truely inelastic regime. During the cooling stage
we observe complex cluster dynamics, as large clusters of particles form,
collide and merge or dissolve. Typical clusters are found to survive long
enough to establish local equilibrium within a cluster, but not among different
clusters. We extend the model to include net dissipation of energy by damping
of the internal vibrations. Inelatic collapse is avoided also in this case but
in contrast to the conservative system the translational energy decays
according to the mean field scaling law, E(t)\propto t^{-2}, for asymptotically
long times.Comment: 10 pages, 12 figures, Latex; extended discussion, accepted for
publication in Phys. Rev.
Top-transmon: hybrid superconducting qubit for parity-protected quantum computation
Qubits constructed from uncoupled Majorana fermions are protected from
decoherence, but to perform a quantum computation this topological protection
needs to be broken. Parity-protected quantum computation breaks the protection
in a minimally invasive way, by coupling directly to the fermion parity of the
system --- irrespective of any quasiparticle excitations. Here we propose to
use a superconducting charge qubit in a transmission line resonator (a socalled
transmon) to perform parity-protected rotations and read-out of a topological
(top) qubit. The advantage over an earlier proposal using a flux qubit is that
the coupling can be switched on and off with exponential accuracy, promising a
reduced sensitivity to charge noise.Comment: 7 pages, 5 figure
Shot noise suppression at room temperature in atomic-scale Au junctions
Shot noise encodes additional information not directly inferable from simple
electronic transport measurements. Previous measurements in atomic-scale metal
junctions at cryogenic temperatures have shown suppression of the shot noise at
particular conductance values. This suppression demonstrates that transport in
these structures proceeds via discrete quantum channels. Using a high frequency
technique, we simultaneously acquire noise data and conductance histograms in
Au junctions at room temperature and ambient conditions. We observe noise
suppression at up to three conductance quanta, with possible indications of
current-induced local heating and noise in the contact region at high
biases. These measurements demonstrate the quantum character of transport at
room temperature at the atomic scale. This technique provides an additional
tool for studying dissipation and correlations in nanodevices.Comment: 15 pages, 4 figures + supporting information (6 pages, 6 figures
Modeling and Simulation of Multi-Lane Traffic Flow
A most important aspect in the field of traffic modeling is the simulation of
bottleneck situations. For their realistic description a macroscopic multi-lane
model for uni-directional freeways including acceleration, deceleration,
velocity fluctuations, overtaking and lane-changing maneuvers is systematically
deduced from a gas-kinetic (Boltzmann-like) approach. The resulting equations
contain corrections with respect to previous models. For efficient computer
simulations, a reduced model delineating the coarse-grained temporal behavior
is derived and applied to bottleneck situations.Comment: For related work see
http://www.theo2.physik.uni-stuttgart.de/helbing.htm
Shock-Like Dynamics of Inelastic Gases
We provide a simple physical picture which suggests that the asymptotic
dynamics of inelastic gases in one dimension is independent of the degree of
inelasticity. Statistical characteristics, including velocity fluctuations and
the velocity distribution are identical to those of a perfectly inelastic
sticky gas, which in turn is described by the inviscid Burgers equation.
Asymptotic predictions of this continuum theory, including the t^{-2/3}
temperature decay and the development of discontinuities in the velocity
profile, are verified numerically for inelastic gases.Comment: 4 pages, 5 figures, revte
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