pinecone/core-2020-05-10-deduplication huggingface dataset:
“Almost stable” matchings in the Roommates problem with bounded preference lists

AbstractAn instance of the classical Stable Roommates problem need not admit a stable matching. Previous work has considered the problem of finding a matching that is “as stable as possible”, i.e., admits the minimum number of blocking pairs. It is known that this problem is NP-hard and not approximable within n12−ε, for any ε>0, unless P=NP, where n is the number of agents in a given instance. In this paper, we extend the study to the Stable Roommates problem with Incomplete lists. In particular, we consider the case that the lengths of the lists are bounded by some integer d. We show that, even if d=3, there is some c>1 such that the problem of finding a matching with the minimum number of blocking pairs is not approximable within c unless P=NP. On the other hand, we show that the problem is solvable in polynomial time for d≤2, and we give a (2d−3)-approximation algorithm for fixed d≥3. If the given lists satisfy an additional condition (namely the absence of a so-called elitist odd party–a structure that is unlikely to exist in general), the performance guarantee improves to 2d−4
A randomized encoding of the π-calculus with mixed choice

AbstractWe consider the problem of encoding the π-calculus with mixed choice (i.e. input/output guarded choice) into the asynchronous π-calculus. We are interested in a translation which satisfies certain desirable properties, namely uniformity and preservation of a reasonable semantics. Although it has been shown that this is not possible with an exact encoding, we suggest a randomized approach using a probabilistic extension of the asynchronous π-calculus, and we show that our solution is correct with probability 1 under any proper adversary wrt a notion of testing semantics. This result establishes the basis for a distributed and symmetric implementation of mixed choice which, unlike previous proposals in literature, does not rely on assumptions on the relative speed of processes and it is robust to attacks of proper adversaries
HGF/c-Met signaling promotes liver progenitor cell migration and invasion by an epithelial–mesenchymal transition-independent, phosphatidyl inositol-3 kinase-dependent pathway in an in vitro model

AbstractOval cells constitute an interesting hepatic cell population. They contribute to sustain liver regeneration during chronic liver damage, but in doing this they can be target of malignant conversion and become tumor-initiating cells and drive hepatocarcinogenesis. The molecular mechanisms beneath either their pro-regenerative or pro-tumorigenic potential are still poorly understood. In this study, we have investigated the role of the HGF/c-Met pathway in regulation of oval cell migratory and invasive properties. Our results show that HGF induces c-Met-dependent oval cell migration both in normal culture conditions and after in vitro wounding. HGF-triggered migration involves F-actin cytoskeleton reorganization, which is also evidenced by activation of Rac1. Furthermore, HGF causes ZO-1 translocation from cell–cell contact sites to cytoplasm and its concomitant activation by phosphorylation. However, no loss of expression of cell–cell adhesion proteins, including E-cadherin, ZO-1 and Occludin-1, is observed. Additionally, migration does not lead to cell dispersal but to a characteristic organized pattern in rows, in turn associated with Golgi compaction, providing strong evidence of a morphogenic collective migration. Besides migration, HGF increases oval cell invasion through extracellular matrix, a process that requires PI3K activation and is at least partly mediated by expression and activation of metalloproteases. Altogether, our findings provide novel insights into the cellular and molecular mechanisms mediating the essential role of HGF/c-Met signaling during oval cell-mediated mouse liver regeneration
Multiparticle production in the large lambda n limit: Realising
  Higgsplosion in a scalar QFT

In a scalar theory which we use as a simplified model for the Higgs sector,
we adopt the semiclassical formalism of Son for computations of $n$-particle
production cross-sections in the high-multiplicity $n\to \infty$ weak-coupling
$\lambda \to 0$ regime with the value of $\lambda n$ held fixed and large. The
approach relies on the use of singular classical solutions to a certain
boundary value problem. In the past this formalism has been successfully used
and verified in computations of perturbative multi-particle processes at
tree-level, and also at the next-to-leading order level in the small $\lambda
n$ expansion near the multi-particle mass threshold. We apply this singular
solutions formalism in the regime of ultra-high multiplicities where $\lambda n
\gg 1$, and compute the leading positive $\sim n\,\sqrt{\lambda n}$
contribution to the exponent of the multi-particle rate in this large $\lambda
n$ limit. The computation is carried out near the multi-particle mass threshold
where the multiplicity $n$ approaches its maximal value allowed by kinematics.
This calculation relies on the idea of Gorsky and Voloshin to use a thin wall
approximation for the singular solutions that resemble critical bubbles. This
approximation is justified in precisely the high-multiplicity $\sqrt{\lambda n}
\to \infty$ regime of interest. Based on our results we show that the scalar
theory with a spontaneous symmetry breaking used here as a simplified model for
the Higgs sector, is very likely to realise the high-energy Higgsplosion
phenomenon.Comment: 21 pages, 2 figures, v2: minor corrections, matches version accepted
  in JHEP, v3: extended discussion below Eq. (4.10), minor corrections, v4: few
  typos (signs and factors) corrected in intermediate result
Planck intermediate results. X. Physics of the hot gas in the Coma
  cluster

We present an analysis of Planck satellite data on the Coma Cluster observed
via the Sunyaev-Zeldovich effect. Planck is able, for the first time, to detect
SZ emission up to r ~ 3 X R_500. We test previously proposed models for the
pressure distribution in clusters against the azimuthally averaged data. We
find that the Arnaud et al. universal pressure profile does not fit Coma, and
that their pressure profile for merging systems provides a good fit of the data
only at r<R_500: by r=2XR_500 it underestimates the observed y profile by a
factor of ~2. This may indicate that at these larger radii either i) the
cluster SZ emission is contaminated by unresolved SZ sources along the line of
sight or ii) the pressure profile of Coma is higher at r>R_500 than the mean
pressure profile predicted by the simulations. The Planck image shows
significant local steepening of the y profile in two regions about half a
degree to the west and to the south-east of the cluster centre. These features
are consistent with the presence of shock fronts at these radii, and indeed the
western feature was previously noticed in the ROSAT PSPC mosaic as well as in
the radio. Using Planck y profiles extracted from corresponding sectors we find
pressure jumps of 4.5+0.4-0.2 and 5.0+1.3-0.1 in the west and southeast,
respectively. Assuming Rankine-Hugoniot pressure jump conditions, we deduce
that the shock waves should propagate with Mach number M_w=2.03+0.09-0.04 and
M_se=2.05+0.25-0.02 in the West and Southeast, respectively. Finally, we find
that the y and radio-synchrotron signals are quasi-linearly correlated on Mpc
scales with small intrinsic scatter. This implies either that the energy
density of cosmic-ray electrons is relatively constant throughout the cluster,
or that the magnetic fields fall off much more slowly with radius than
previously thought.Comment: 20 pages, 18 figure, accepted by A&A, replaced to match published
  versio
Study of exclusive two-photon production of W+W- in pp collisions at √s=7 TeV and constraints on anomalous quartic gauge couplings

A search for exclusive or quasi-exclusive W+W- production by photon-photon interactions, pp → p(*)W +W-p(*), at √s=7 TeV is reported using data collected by the CMS detector with an integrated luminosity of 5.05 fb-1. Events are selected by requiring a μ ±e∓ vertex with no additional associated charged tracks and dilepton transverse momentum p T(μ ±e∓) > 30 GeV. Two events passing all selection requirements are observed in the data, compared to a standard model expectation of 2.2 ± 0.4 signal events with 0.84 ± 0.15 background. The tail of the dilepton p T distribution is studied for deviations from the standard model. No events are observed with p T > 100 GeV. Model-independent upper limits are computed and compared to predictions involving anomalous quartic gauge couplings. The limits on the parameters α0,C W/λ2 with a dipole form factor and an energy cutoff Λcutoff = 500 GeV are of the order of 10-4. © 2013 CERN for the benefit of the CMS collaboration.The Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authorit
Search for excited quarks in the γ + jet final state in proton-proton collisions at √s=8TeV

A search for excited quarks decaying into the γ + jet final state is presented. The analysis is based on data corresponding to an integrated luminosity of 19.7 fb-1 collected by the CMS experiment in proton-proton collisions at √s=8TeV at the LHC. Events with photons and jets with high transverse momenta are selected and the γ + jet invariant mass distribution is studied to search for a resonance peak. The 95% confidence level upper limits on the product of cross section and branching fraction are evaluated as a function of the excited quark mass. Limits on excited quarks are presented as a function of their mass and coupling strength; masses below 3.5 TeV are excluded at 95% confidence level for unit couplings to their standard model partners. © 2014 The Authors.The Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authorit
Angular coefficients of Z bosons produced in pp collisions at (root) S=8 TeV and decaying to μ+μ- as a function of transverse momentum and rapidity

Measurements of the five most significant angular coefficients, A0 through A4, for Z bosons produced in pp collisions at s=8 TeV and decaying to μ+μ- are presented as a function of the transverse momentum and rapidity of the Z boson. The integrated luminosity of the dataset collected with the CMS detector at the LHC corresponds to 19.7fb-1. These measurements provide comprehensive information about the Z boson production mechanisms, and are compared to the QCD predictions at leading order, next-to-leading order, and next-to-next-to-leading order in perturbation theory. © 2015 CERN for the benefit of the CMS Collaboration.The Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authorit
Measurement of the mass of the top quark in decays with a J/ψ meson in pp collisions at 8 TeV

A first measurement of the top quark mass in the decay channel t → (W → ℓν) (b → J/ψ + X → μ+μ− + X) is presented. The analysis uses events selected from the proton-proton collisions recorded by the CMS detector at the LHC at a center-of-mass energy of 8 TeV. The data correspond to an integrated luminosity of 19.7 fb−1, with 666 t t ¯ and single top quark candidate events containing a reconstructed J/ψ candidate decaying into an oppositely-charged muon pair. The mass of the (J/ψ + ℓ) system, where ℓ is an electron or a muon from W boson decay, is used to extract a top quark mass of 173.5 ± 3.0 (stat) ± 0.9 (syst) GeV.The Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authorit
Metastable Pluripotent States in NOD Mouse Derived ES Cells

Embryonic stem (ES) cells are isolated from the inner cell mass (ICM) of blastocysts, whereas
epiblast stem cells (EpiSCs) are derived from the post-implantation epiblast and display a restricted developmental potential. Here we characterize pluripotent states in the non-obese diabetic (NOD) mouse strain, which prior to this study was considered “non-permissive” for ES cell derivation. We find that NOD stem cells can be stabilized by providing constitutive expression of Klf4 or c-Myc or small molecules that can replace these factors during in vitro reprogramming. The NOD ES and iPS cells appear “metastable”, as they acquire an alternative EpiSC-like identity after removal of the exogenous factors, while their reintroduction converts the cells back to ICM-like pluripotency. Our findings suggest that stem cells from different genetic backgrounds can assume distinct states of pluripotency in vitro, the stability of which is regulated by endogenous genetic determinants and can be modified by exogenous factors.National Institutes of Health (U.S.) (Grant RO1-HDO45022)National Institutes of Health (U.S.) (Grant R37-CA084198)National Institutes of Health (U.S.) (Grant RO1-CA087869
Macromolecular symmetric assembly prediction using swarm intelligence dynamic modeling.

Proteins often assemble in multimeric complexes to perform a specific biologic function. However, trapping these high-order conformations is difficult experimentally. Therefore, predicting how proteins assemble using in silico techniques can be of great help. The size of the associated conformational space and the fact that proteins are intrinsically flexible structures make this optimization problem extremely challenging. Nonetheless, known experimental spatial restraints can guide the search process, contributing to model biologically relevant states. We present here a swarm intelligence optimization protocol able to predict the arrangement of protein symmetric assemblies by exploiting a limited amount of experimental restraints and steric interactions. Importantly, within this scheme the native flexibility of each protein subunit is taken into account as extracted from molecular dynamics (MD) simulations. We show that this is a key ingredient for the prediction of biologically functional assemblies when, upon oligomerization, subunits explore activated states undergoing significant conformational changes
Local integrands for two-loop all-plus Yang-Mills amplitudes.

We express the planar five- and six-gluon two-loop Yang-Mills amplitudes with all positive helicities in compact analytic form using D-dimensional local integrands that are free of spurious singularities. The integrand is fixed from on-shell tree amplitudes in six dimensions using D-dimensional generalised unitarity cuts. The resulting expressions are shown to have manifest infrared behaviour at the integrand level. We also find simple representations of the rational terms obtained after integration in 4 − 2ϵ dimensions
Investigation of influence of tab types on tensile strength of E-glass/epoxy fiber reinforced composite materials

Mechanical response of E-glass/epoxy fiber reinforced composite was investigated in tensile loading. Different types of tabs were considered in order to evaluate their effects on the tensile strength of material. Specifically, two types of molded tabs and five types of bonded tabs were considered in the study. The influence of different amount of gripping pressures on failure mode and on tensile strength of specimens was also considered in the analysis. The experimental results showed that the tabs configuration affected the tensile strength of the specimens. Starting from the experimental results, an appropriate testing methodology is proposed for E-glass/epoxy fiber reinforced composite specimens in order to reduce problems that may arise during the test and to optimize procedures for preparation of specimen
Corrosion protection with zinc-rich epoxy paint coatings embedded with various amounts of highly dispersed polypyrrole-deposited alumina monohydrate particles

Active anodic zinc content below 90 wt.% does not support sufficient electrical contacts but higher contents cause high porosity of traditional liquid zinc-rich paints (ZRPs). To resolve this problem, our proposal is the application of highly dispersed polypyrrole (PPy) coated alumina inhibitor particles (PCAIPs) in zinc-rich paint compositions. Using these nano-size inhibitor particles at concentrations from 4.55 to 0.85 wt.%, hybrid paints were formulated with zinc contents ranging from 60 to 85 wt.% at the same time. Submicron morphology and nano-scale structure, spectroscopy characteristics and electrochemical properties of the PCAIPs were studied by transmission electron microscopy (TEM) and rheology, Fourier-transform infrared spectroscopy (FT-IR) and cyclic voltammetry (CV) in first part of the work. In the second part, electrolytic corrosion resistivity of two sets of paint coatings were salt-spray chamber and immersion tested with 5 wt.% aqueous solution of sodium chloride. Active corrosion prevention ability of the salt-spray tested coatings was evaluated in compliance with ISO recommendations. Dielectric properties of the coatings during the immersion tests were monitored by electrochemical impedance spectroscopy (EIS). Corrosion tested area of the coatings was investigated by glow-discharge optical emission spectroscopy (GD-OES) to disclose infiltration of corrosive analytes and oxygen enrichment in the cross-section of the primers in comparison with their pristine states. Morphology of the zinc pigments was examined by scanning electron microscopy (SEM), and quality of steel specimens and the interfacial binder residues by X-ray photoelectron spectroscopy (XPS) as well as FT-Raman and Mössbauer spectroscopy. The results of both types of corrosion tests evidenced efficient utilisation of sacrificial anodic current for galvanic protection and improved barrier profile of the hybrid coatings, along with the PCAIP inhibited moderate self-corrosion of zinc. As a result of well balanced active/passive function, the hybrid coating containing zinc at 80 wt.% and PCAIPs at 1.75 wt.% embedding PPy at 0.056 wt.% indicated the most advanced corrosion prevention. Galvanic function of the hybrid paints is interpreted on the basis of size-range effect and spatial distribution of the alumina supported PPy inhibitor particles and basic electrical percolation model considerations
Nonlinear Stochastic Convergence Analysis of Regional Unemployment Rates in Poland

This paper analyzes convergence of unemployment rates in Poland at NUTS4 level by testing nonlinear convergence, applying the modified KSS-CHLL for each pair of territorial units. The results suggest that actually the convergence is a rare phenomenon and occurs only in 1916 cases out of potential over 70 000 combinations. This paper inquires what systematic reasons contribute to this phenomenon.
There are some circumstances under which unemployment convergence should be more awaited than in the others. These include sharing a higher level territorial authority, experiencing similar labour market hardship or sharing the same structural characteristics. For each of these three criteria we analyse the frequency of the dierential nonstationarity within groups (as evidence of convergence)
and across groups (as evidence of "catching up").
The Dynamics of Electricity Consumption and Economic Growth:A Revisit Study of Their Causality in Pakistan

This study revisits the relationship between electricity consumption and economic growth in Pakistan by controlling and investigating the effects of two major production factors - capital and labor. The empirical evidence confirms the cointegration among the variables and indicates that electricity consumption has a positive effect on economic growth. Moreover, bi-directional Ganger causality between electricity consumption and economic growth has been found. The findings suggests that adoption of electricity conservation policies to conserve energy resources may unwittingly decline growth and the lower growth rate will in turn further decrease the demand for electricity. Therefore, governments contemplating such conservationist policies should instead explore and develop alternate sources of energy as a strategy rather than just increasing electricity production per se in order to meet the rising demand for electricity in their quest towards sustaining development in the country.
On the feasibility of monetary union among Gulf Cooperation Council (GCC) countries: does the symmetry of shocks extend to the non-oil sector?

GCC countries’ output is heavily dichotomized into oil and non-oil. Oil shocks have similar effects on all member countries but little is known about their responses to non-oil shocks. This paper sets out to determine (1) whether aggregate demand (AD) and non-oil supply shocks (AS) are symmetrical across these countries to justify their suitability for monetary union; and (2) whether there is any commonality of shocks with the United States and the three major European countries, namely France, Germany, and Italy, which can warrant the choice of either the US dollar or the Euro as the anchor for the expected common currency of the bloc. We use bivariate structural vector autoregression models identified with long-run restrictions to extract the shocks. Our results show that (a) AD shocks are unequivocally symmetrical but non-oil AS shocks are weakly symmetrical across GCC countries thereby suggesting a monetary union is feasible, but not overwhelmingly; (b) neither AD nor AS shocks are symmetrical between GCC countries and the selected European countries; (c) GCC’s AD shocks are symmetrical with the US but non-oil AS shock are not. Furthermore, there are no significant changes in the results when we aggregate the GCC countries as a bloc. We therefore surmise that the US dollar is a more appropriate anchor for the new currency than the Euro since US monetary policy can at least help smooth demand shocks in GCC countries.
Longitudinal asymmetry and its effect on pseudorapidity distributions in
  Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV

First results on the longitudinal asymmetry and its effect on the
pseudorapidity distributions in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ =
2.76 TeV at the Large Hadron Collider are obtained with the ALICE detector. The
longitudinal asymmetry arises because of an unequal number of participating
nucleons from the two colliding nuclei, and is estimated for each event by
measuring the energy in the forward neutron-Zero-Degree-Calorimeters (ZNs). The
effect of the longitudinal asymmetry is measured on the pseudorapidity
distributions of charged particles in the regions $|\eta| < 0.9$, $2.8 < \eta <
5.1$ and $-3.7 < \eta < -1.7 $ by taking the ratio of the pseudorapidity
distributions from events corresponding to different regions of asymmetry. The
coefficients of a polynomial fit to the ratio characterise the effect of the
asymmetry. A Monte Carlo simulation using a Glauber model for the colliding
nuclei is tuned to reproduce the spectrum in the ZNs and provides a relation
between the measurable longitudinal asymmetry and the shift in the rapidity
($y_{\mathrm{0}}$) of the participant zone formed by the unequal number of
participating nucleons. The dependence of the coefficient of the linear term in
the polynomial expansion, $c_{\rm 1}$, on the mean value of $y_{\mathrm{0}}$ is
investigated.Comment: 21 pages, 9 captioned figures, authors from page 16, published
  version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/408