pinecone/core-2020-05-10-deduplication huggingface dataset:
Electrical properties and reactivity under air–CO flows of composite systems based on ceria coated carbon nanotubes

Nanocomposite systems of ceria nanoparticles and Double Walled Carbon Nanotubes (DWNTs) coated with nanoceria (nCeO2) were elaborated using a classical sol gel method. Three samples noted as [nCeO2 + xDWNTs] with variable weight fractions x = 0, 5 and 15 wt.% of DWNTs were obtained. The samples were characterized by Xray diffraction and electron microscopy. The electrical conductivity of [nCeO2 + xDWNTs] compacted pellets systems was determined from electrical impedance spectrometry, under air, between 120 and 400 °C. In this temperature range, all  samples were semiconducting with a weak variation of activation energy. However, the conductivity strongly increased with the weight fraction of ceria coated carbon nanotubes. Finally, the solid–gas interactions between air–CO flows and these systems were studied as a function of time and temperature, by means of Fourier transform infrared (FTIR) spectroscopy. The oxidation kinetics of CO into CO2 was analyzed from the evolutions of FTIR absorption band intensities. As the carbon nanotube fraction x increased, the conversion efficiency was strongly improved
Hematopoietic stem cell function and survival depend on c-Myc and N-Myc activity.

Myc activity is emerging as a key element in acquisition and maintenance of stem cell properties. We have previously shown that c-Myc deficiency results in accumulation of defective hematopoietic stem cells (HSCs) due to niche-dependent differentiation defects. Here we report that immature HSCs coexpress c-myc and N-myc mRNA at similar levels. Although conditional deletion of N-myc in the bone marrow does not affect hematopoiesis, combined deficiency of c-Myc and N-Myc (dKO) results in pancytopenia and rapid lethality. Interestingly, proliferation of HSCs depends on both myc genes during homeostasis, but is c-Myc/N-Myc independent during bone marrow repair after injury. Strikingly, while most dKO hematopoietic cells undergo apoptosis, only self-renewing HSCs accumulate the cytotoxic molecule Granzyme B, normally employed by the innate immune system, thereby revealing an unexpected mechanism of stem cell apoptosis. Collectively, Myc activity (c-Myc and N-Myc) controls crucial aspects of HSC function including proliferation, differentiation, and survival
The effects of mergers and acquisitions on the firm size distribution

This paper provides new empirical evidence on the effects of mergers and acquisitions (M&As) on the shape of the firm size distribution, by using data of the population of manufacturing firms in the Netherlands. Our analysis shows that M&As do not affect the size distribution when we consider the entire population of firms. When we focus on the firms involved in an M&A event, we observe a shift of the firm size distribution towards larger sizes. Firm size distribution becomes more concentrated around the mean, less skewed to the right hand side, and thinner at the tails as a whole. The shift toward higher sizes due to M&A is not uniform but affects firms of different sizes in different ways. While the number of firms in the lower tail decreased, the number of firms in the central size classes increased substantially and outweighed the increase in the number (and mean size) of firms in the upper tail of the distribution (consequently the overall market concentration measured by the Herfindahl index declines). M&As lead to a departure from log-normality of the firm size distribution, suggesting that external growth does not follow Gibrat's law. Our counterfactual analysis highlights that only internal growth does not affect the shape of the size distribution of firms. On the contrary, it suggests that the change in the size distribution is almost entirely due to the external growth of the firms
Analyticity of layer potentials and $L^{2}$ solvability of boundary
  value problems for divergence form elliptic equations with complex
  $L^{\infty}$ coefficients

We consider divergence form elliptic operators of the form $L=-\dv
A(x)\nabla$, defined in $R^{n+1} = \{(x,t)\in R^n \times R \}$, $n \geq 2$,
where the $L^{\infty}$ coefficient matrix $A$ is $(n+1)\times(n+1)$, uniformly
elliptic, complex and $t$-independent. We show that for such operators,
boundedness and invertibility of the corresponding layer potential operators on
$L^2(\mathbb{R}^{n})=L^2(\partial\mathbb{R}_{+}^{n+1})$, is stable under
complex, $L^{\infty}$ perturbations of the coefficient matrix. Using a variant
of the $Tb$ Theorem, we also prove that the layer potentials are bounded and
invertible on $L^2(\mathbb{R}^n)$ whenever $A(x)$ is real and symmetric (and
thus, by our stability result, also when $A$ is complex, $\Vert
A-A^0\Vert_{\infty}$ is small enough and $A^0$ is real, symmetric, $L^{\infty}$
and elliptic). In particular, we establish solvability of the Dirichlet and
Neumann (and Regularity) problems, with $L^2$ (resp. $\dot{L}^2_1)$ data, for
small complex perturbations of a real symmetric matrix. Previously, $L^2$
solvability results for complex (or even real but non-symmetric) coefficients
were known to hold only for perturbations of constant matrices (and then only
for the Dirichlet problem), or in the special case that the coefficients
$A_{j,n+1}=0=A_{n+1,j}$, $1\leq j\leq n$, which corresponds to the Kato square
root problem
Searches for light- and heavy-flavour three-jet resonances in pp collisions at sqrt(s) = 8 TeV

A search for three-jet hadronic resonance production in pp collisions at a centre-of-mass energy of 8 TeV has been conducted by the CMS Collaboration at the LHC with a data sample corresponding to an integrated luminosity of 19.4 fb−119.4 fb−1. The search method is model independent, and events are selected that have high jet multiplicity and large values of jet transverse momenta. The signal models explored assume R-parity-violating supersymmetric gluino pair production and have final states with either only light-flavour jets or both light- and heavy-flavour jets. No significant deviation is found between the selected events and the expected standard model multijet and View the MathML sourcett¯ background. For a gluino decaying into light-flavour jets, a lower limit of 650 GeV on the gluino mass is set at a 95% confidence level, and for a gluino decaying into one heavy- and two light-flavour jets, gluino masses between 200 and 835 GeV are, for the first time, likewise excluded
Simulating Reionization: Character and Observability

In recent years there has been considerable progress in our understanding of
the nature and properties of the reionization process. In particular, the
numerical simulations of this epoch have made a qualitative leap forward,
reaching sufficiently large scales to derive the characteristic scales of the
reionization process and thus allowing for realistic observational predictions.
Our group has recently performed the first such large-scale radiative transfer
simulations of reionization, run on top of state-of-the-art simulations of
early structure formation. This allowed us to make the first realistic
observational predictions about the Epoch of Reionization based on detailed
radiative transfer and structure formation simulations. We discuss the basic
features of reionization derived from our simulations and some recent results
on the observational implications for the high-redshift Ly-alpha sources.Comment: 3 pages, to appear in the Proceedings of First Stars III, Santa Fe,
  July 2007, AIP Conference Serie
Combined arm stretch positioning and neuromuscular electrical stimulation during rehabilitation does not improve range of motion, shoulder pain or function in patients after stroke: a randomised trial.

Contains fulltext :
                  125557.pdf (publisher's version ) (Open Access)QUESTION: Does static stretch positioning combined with simultaneous neuromuscular electrical stimulation (NMES) in the subacute phase after stroke have beneficial effects on basic arm body functions and activities? DESIGN: Multicentre randomised trial with concealed allocation, assessor blinding, and intention-to-treat analysis. PARTICIPANTS: Forty-six people in the subacute phase after stroke with severe arm motor deficits (initial Fugl-Meyer Assessment arm score </= 18). INTERVENTION: In addition to conventional stroke rehabilitation, participants in the experimental group received arm stretch positioning combined with motor amplitude NMES for two 45-minute sessions a day, five days a week, for eight weeks. Control participants received sham arm positioning (ie, no stretch) and sham NMES (ie, transcutaneous electrical nerve stimulation with no motor effect) to the forearm only, at a similar frequency and duration. OUTCOME MEASURES: The primary outcome measures were passive range of arm motion and the presence of pain in the hemiplegic shoulder. Secondary outcome measures were severity of shoulder pain, restrictions in performance of activities of daily living, hypertonia, spasticity, motor control and shoulder subluxation. Outcomes were assessed at baseline, mid-treatment, at the end of the treatment period (8 weeks) and at follow-up (20 weeks). RESULTS: Multilevel regression analysis showed no significant group effects nor significant time x group interactions on any of the passive range of arm motions. The relative risk of shoulder pain in the experimental group was non-significant at 1.44 (95% CI 0.80 to 2.62). CONCLUSION: In people with poor arm motor control in the subacute phase after stroke, static stretch positioning combined with simultaneous NMES has no statistically significant effects on range of motion, shoulder pain, basic arm function, or activities of daily living. TRIAL REGISTRATION: NTR1748.1 december 201
The first decade of biomedical engineering degree program at the University of Malaya: experiences and achievements

The Department of Biomedical Engineering, at the Faculty of Engineering, University of Malaya was established in the 1997/1998 academic session with an intake of 20 students and five academic staff. The Department has undergone numerous changes in the structure of its degree programme, with each one of them recognised and fully accredited by the Engineering Accreditation Council and Ministry of Higher Education. The Department has played an active role at national and global levels, in the areas of biomedical engineering education and research collaboration. Several initiatives have been planned to ensure the Department stays at the forefront of disseminating biomedical engineering innovations in Malaysia
Widespread age-related differences in the human brain microstructure revealed by quantitative magnetic resonance imaging

A pressing need exists to disentangle age-related changes from pathologic neurodegeneration. This study aims to characterize the spatial pattern and age-related differences of biologically relevant measures in vivo over the course of normal aging. Quantitative multiparameter maps that provide neuroimaging biomarkers for myelination and iron levels, parameters sensitive to aging, were acquired from 138 healthy volunteers (age range: 19-75 years). Whole-brain voxel-wise analysis revealed a global pattern of age-related degeneration. Significant demyelination occurred principally in the white matter. The observed age-related differences in myelination were anatomically specific. In line with invasive histologic reports, higher age-related differences were seen in the genu of the corpus callosum than the splenium. Iron levels were significantly increased in the basal ganglia, red nucleus, and extensive cortical regions but decreased along the superior occipitofrontal fascicle and optic radiation. This whole-brain pattern of age-associated microstructural differences in the asymptomatic population provides insight into the neurobiology of aging. The results help build a quantitative baseline from which to examine and draw a dividing line between healthy aging and pathologic neurodegeneration
Effect of quark-mass variation on big bang nucleosynthesis

We calculate the effect of variation in the light-current quark mass, $m_q$,
on standard big bang nucleosynthesis. A change in $m_q$ at during the era of
nucleosynthesis affects nuclear reaction rates, and hence primordial
abundances, via changes the binding energies of light nuclei. It is found that
a relative variation of $\delta m_q/m_q = 0.016 \pm 0.005$ provides better
agreement between observed primordial abundances and those predicted by theory.
This is largely due to resolution of the existing discrepancies for 7Li.
However this method ignores possible changes in the position of resonances in
nuclear reactions. The predicted 7Li abundance has a strong dependence on the
cross-section of the resonant reactions 3He(d,p)4He and t(d,n)4He. We show that
changes in $m_q$ at the time of BBN could shift the position of these
resonances away from the Gamow window and lead to an increased production of
7Li, exacerbating the lithium problem
First principles study of the adsorption of C60 on Si(111)

The adsorption of C60 on Si(111) has been studied by means of
first-principles density functional calculations.
  A 2x2 adatom surface reconstruction was used to simulate the terraces of the
7x7 reconstruction.
  The structure of several possible adsorption configurations was optimized
using the ab initio atomic forces, finding good candidates for two different
adsorption states observed experimentally.
  While the C60 molecule remains closely spherical, the silicon substrate
appears quite soft, especially the adatoms, which move substantially to form
extra C-Si bonds, at the expense of breaking Si-Si bonds.
  The structural relaxation has a much larger effect on the adsorption
energies, which strongly depend on the adsorption configuration, than on the
charge transfer.Comment: 4 pages with 3 postscript figures, to appear in Surf. Science.
  (proceedings of the European Conference on Surface Science ECOSS-19, Sept
  2000
Energy level statistics at the metal-insulator transition in the
  Anderson model of localization with anisotropic hopping

Recently, a metal-insulator transition (MIT) was found in the anisotropic
Anderson model of localization by transfer-matrix methods (TMM). This MIT has
been also investigated by multifractal analysis (MFA) and the same critical
disorders $W_c$ have been obtained within the accuracy of the data. We now
employ energy level statistics (ELS) to further characterize the MIT. We find a
crossover of the nearest-neighbor level spacing distribution $P(s)$ from GOE
statistics at small disorder indicating metallic behavior to the Poisson
distribution at large disorder characteristic for localized states. An analysis
of the system size dependence of the spectral rigidity $\Delta_3(L)$ confirms
the values of $W_c$ from TMM and MFA.Comment: 5 pages, 3 eps figure
Critical Hamiltonians with long range hopping

Critical states are studied by a real space RG in the problem with strong
diagonal disorder and long range power law hopping. The RG flow of the
distribution of coupling parameters is characterized by a family of non-trivial
fix points. We consider the RG flow of the distribution of participation ratios
of eigenstates. Scaling of participation ratios is sensitive to the nature of
the RG fix point. For some fix points, scaling of participation ratios is
characterized by a distribution of exponents, rather than by a single exponent.
  The RG method can be generalized to treat certain fermionic Hamiltonians with
disorder and long range hopping. We derive the RG for a model of interacting
two-level systems. Besides couplings, in this problem the RG includes the
density of states. The density of states is renormalized so that it develops a
singularity near zero energy.Comment: 10 pages, 5 eps figures, LaTeX uses annalen.cls style (included),
  proceedings of Localization 9
Search for R-Parity Violating Production of Single Sneutrinos in e+e-
  Collisions at sqrt(s) = 189-209GeV

A search for single sneutrino production under the assumption that R-parity
is violated via a single dominant $LL\bar{E}$ coupling is presented. This
search considers the process ${\rm e} \gamma {\smash{\mathop{\to}}}
\tilde{\nu}\ell$ and is performed using the data collected by the ALEPH
detector at centre-of-mass energies from 189 GeV up to 209 GeV corresponding to
an integrated luminosity of 637.1 $\mathrm{pb}^{-1}$. The numbers of observed
candidate events are in agreement with Standard Model expectations and 95%
confidence level upper limits on five of the $LL\bar{E}$ couplings are given as
a function of the assumed sneutrino mass.Comment: 22 pages, 14 figure
A Very Intense Neutrino Super Beam Experiment for Leptonic CP Violation
  Discovery based on the European Spallation Source Linac: A Snowmass 2013
  White Paper

Very intense neutrino beams and large neutrino detectors will be needed in
order to enable the discovery of CP violation in the leptonic sector. We
propose to use the proton linac of the European Spallation Source currently
under construction in Lund, Sweden to deliver, in parallel with the spallation
neutron production, a very intense, cost effective and high performance
neutrino beam. The baseline program for the European Spallation Source linac is
that it will be fully operational at 5 MW average power by 2022, producing 2
GeV 2.86 ms long proton pulses at a rate of 14 Hz. Our proposal is to upgrade
the linac to 10 MW average power and 28 Hz, producing 14 pulses/s for neutron
production and 14 pulses/s for neutrino production. Furthermore, because of the
high current required in the pulsed neutrino horn, the length of the pulses
used for neutrino production needs to be compressed to a few $\mu$s with the
aid of an accumulator ring. A long baseline experiment using this Super Beam
and a megaton underground Water Cherenkov detector located in existing mines
300-600 km from Lund will make it possible to discover leptonic CP violation at
5 $\sigma$ significance level in up to 50% of the leptonic Dirac CP-violating
phase range. This experiment could also determine the neutrino mass hierarchy
at a significance level of more than 3 $\sigma$ if this issue will not already
have been settled by other experiments by then. The mass hierarchy performance
could be increased by combining the neutrino beam results with those obtained
from atmospheric neutrinos detected by the same large volume detector. This
detector will also be used to measure the proton lifetime, detect cosmological
neutrinos and neutrinos from supernova explosions. Results on the sensitivity
to leptonic CP violation and the neutrino mass hierarchy are presented.Comment: 28 page
Three irradiated and bloated hot Jupiters: WASP-76b, WASP-82b & WASP-90b

We report three new transiting hot-Jupiter planets discovered from the WASP
surveys combined with radial velocities from OHP/SOPHIE and Euler/CORALIE and
photometry from Euler and TRAPPIST. All three planets are inflated, with radii
1.7-1.8 Rjup. All orbit hot stars, F5-F7, and all three stars have evolved,
post-MS radii (1.7-2.2 Rsun). Thus the three planets, with orbits of 1.8-3.9 d,
are among the most irradiated planets known. This reinforces the correlation
between inflated planets and stellar irradiation
Equilibrium to nonequilibrium condensation in driven-dissipative
  semiconductor systems

Semiconductor microcavity systems strongly coupled to quantum wells are now
receiving a great deal of attention because of their ability to efficiently
generate coherent light by the Bose-Einstein condensation (BEC) of an
exciton-polariton gas. Since the exciton polaritons are composite quasi-bosonic
particles, many fundamental features arise from their original constituents,
i.e., electrons, holes and photons. As a result, not only equilibrium phases
typified by the BEC but also nonequilibrium lasing phases can be achieved. In
this contribution, we describe a framework which can treat such equilibrium and
nonequilibrium phases in a unified way.Comment: 19 pages, 7 figures; prepared for the Springer Lecture Notes in
  Physics "Quantum Computing, Quantum Communication and Quantum Metrology"
  edited by Yoshihisa Yamamoto and Kouichi Semba. Several typing errors are
  correcte
Field-dependent BRST-antiBRST Transformations in Yang-Mills and
  Gribov-Zwanziger Theories

We introduce the notion of finite BRST-antiBRST transformations, both global
and field-dependent, with a doublet $\lambda_{a}$, $a=1,2$, of anticommuting
Grassmann parameters and find explicit Jacobians corresponding to these changes
of variables in Yang--Mills theories. It turns out that the finite
transformations are quadratic in their parameters. At the same time, exactly as
in the case of finite field-dependent BRST transformations for the Yang--Mills
vacuum functional, special field-dependent BRST-antiBRST transformations, with
$s_{a}$-potential parameters $\lambda_{a}=s_{a}\Lambda$ induced by a finite
even-valued functional $\Lambda$ and by the anticommuting generators $s_{a}$ of
BRST-antiBRST transformations, amount to a precise change of the gauge-fixing
functional. This proves the independence of the vacuum functional under such
BRST-antiBRST transformations. We present the form of transformation parameters
that generates a change of the gauge in the path integral and evaluate it
explicitly for connecting two arbitrary $R_{\xi }$-like gauges. For arbitrary
differentiable gauges, the finite field-dependent BRST-antiBRST transformations
are used to generalize the Gribov horizon functional $h$, given in the Landau
gauge, and being an additive extension of the Yang--Mills action by the Gribov
horizon functional in the Gribov--Zwanziger model. This generalization is
achieved in a manner consistent with the study of gauge independence. We also
discuss an extension of finite BRST-antiBRST\ transformations to the case of
general gauge theories and present an ansatz for such transformations.Comment: 31 pages, no figures, introduction extended by discussion of finite
  BRST, antiBRST, mixed BRST-antiBRST transformations, added 8 references,
  typos corrected, accepted for publication in Nuclear Physics
Characterizing the folding core of the cyclophilin A - cyclosporin A
  complex II: improving folding core predictions by including mobility

Determining the folding core of a protein yields information about its
folding process and dynamics. The experimental procedures for identifying the
amino acids which make up the folding core include hydrogen-deuterium exchange
and $\Phi$-value analysis and can be expensive and time consuming. As such
there is a desire to improve upon existing methods for determining protein
folding cores theoretically. Here, we use a combined method of rigidity
analysis alongside coarse-grained simulations of protein motion in order to
improve folding core predictions for unbound CypA and for the CypA-CsA complex.
We find that the most specific prediction of folding cores in CypA and CypA-CsA
comes from the intersection of the results of static rigidity analysis,
implemented in the FIRST software suite, and simulations of the propensity for
flexible motion, using the FRODA tool.Comment: 9 pages, 6 figure