Second-order electronic correlation effects in a one-dimensional metal

The Pariser-Parr-Pople (PPP) model of a single-band one-dimensional (1D) metal is studied at the Hartree-Fock level, and by using the second-order perturbation theory of the electronic correlation. The PPP model provides an extension of the Hubbard model by properly accounting for the long-range character of the electron-electron repulsion. Both finite and infinite version of the 1D-metal model are considered within the PPP and Hubbard approximations. Calculated are the second-order electronic-correlation corrections to the total energy, and to the electronic-energy bands. Our results for the PPP model of 1D metal show qualitative similarity to the coupled-cluster results for the 3D electron-gas model. The picture of the 1D-metal model that emerges from the present study provides a support for the hypothesis that the normal metallic state of the 1D metal is different from the ground state.Comment: 21 pages, 16 figures; v2: small correction in title, added 3 references, extended and reformulated a few paragraphs (detailed information at the end of .tex file); added color to figure

Atomic and electronic structure of graphene oxide/Cu interface

The results of X-ray photoemission (XPS) and valence bands spectroscopy, optically stimulated electron emission (OSEE) measurements and density functional theory based modeling of graphene oxide (GO) placed on Cu via an electrophoretic deposition (EPD) are reported. The comparison of XPS spectra of EPD prepared GO/Cu composites with those of as prepared GO, strongly reduced GO, pure and oxidized copper demonstrate the partial (until C/O ratio about two) removal of oxygen-containing functional groups from GO simultaneously with the formation of copper oxide-like layers over the metallic substrate. OSEE measurements evidence the presence of copper oxide phase in the systems simultaneously with the absence of contributions from GO with corresponding energy gap. All measurements demonstrate the similarity of the results for different thickness of GO cover of the copper surface. Theoretical modeling demonstrates favorability of migration of oxygen-containing functional groups from GO to the copper substrate only for the case of C/O ratio below two and formation of Cu-O-C bonds between substrate and GO simultaneously with the vanishing of the energy gap in GO layer. Basing on results of experimental measurements and theoretical calculations we suggest the model of atomic structure for Cu/GO interface as Cu/CuO/GO with C/O ratio in gapless GO about two.Comment: 22 pages, 14 figures, accepted to Thin Solid Films journa

Analiza przyczyn i rodzaju wtórnych zabiegów interwencyjnych po całkowitej korekcji zespołu Fallota u dzieci. Obserwacje wczesne i średnioodległe

Cel pracy: Analiza przyczyn, rodzaju i częstości oraz wyników zabiegów reinterwencyjnych po całkowitej korekcji zespołu Fallota (TOF) w obserwacji średniookresowej. Materiał i metody: Badana grupa obejmowała 230 dzieci (137 M, 93 Ż) z TOF, poddanych całkowitej korekcji w wieku 2-202 miesięcy (śr. 53,5 ± 41,4), w tym 62 w wieku do 24 miesięcy, 93 w przedziale 25-60 miesięcy życia i 75 starszych, które leczono w okresie 01.01.1990-31.12.2000 r. Z grupy tej zmarło ogółem 10 dzieci (4,3%), głównie we wczesnym okresie pooperacyjnym (75%). Pozostałe obserwowano przez okres 1-125 miesięcy (śr. 45,7 ± 35,8) po zabiegu. Na podstawie analizy wyników badań echokardiograficznych, a u 16 dzieci także hemodynamicznych, zidentyfikowano pacjentów z nieprawidłowościami pooperacyjnymi, wymagających powtórnych zabiegów. U dzieci tych ocenie poddano typ nieprawidłowości, jej częstość oraz rodzaj i wynik podjętego leczenia w odniesieniu do wieku wykonania korekcji całkowitej. Wyniki: Zabiegów reinterwencyjnych wymagało 21 dzieci (9,1%), w tym 12,9% najwcześniej operowanych, 7,5% dzieci z grupy średniej i 8% spośród najstarszych. Czas od korekcji doreinterwencji wynosił 0,03-76 miesięcy, (śr. 21 ± 21,8). U 18 dzieci wykonano reoperacje (u 10 - z powodu resztkowych ubytków międzykomorowych, u 7 - z powodu znacznego zwężenia drogi wypływu z prawej komory, u 3 - z powodu zwężeń gałęzi tętnicy płucnej, u 2 - z powodu tętniaków pnia tętnicy płucnej, u 1 - z powodu znacznej niedomykalności zastawki trójdzielnej i u 1 - z powodu dużych tętnic krążenia obocznego), a u 3 spośród 4 wykonano skuteczną plastykę balonową obwodowych zwężeń tętnicy płucnej. Sześć miesięcy po reinterwencji zmarło 1 dziecko (4,76%) z powodu powikłań infekcyjnych i prawokomorowej niewydolności serca. Wnioski: Zabiegi reinterwencyjne po korekcji TOF u dzieci we wczesnym i pośrednim okresie obserwacji są rzadkie i obarczone niewielkim ryzykiem, a wyniki leczenia są zadowalające. (Folia Cardiol. 2001; 8: 575–580

All-sky Search for High-Energy Neutrinos from Gravitational Wave Event GW170104 with the ANTARES Neutrino Telescope

Advanced LIGO detected a significant gravitational wave signal (GW170104) originating from the coalescence of two black holes during the second observation run on January 4$^{\textrm{th}}$, 2017. An all-sky high-energy neutrino follow-up search has been made using data from the ANTARES neutrino telescope, including both upgoing and downgoing events in two separate analyses. No neutrino candidates were found within $\pm500$ s around the GW event time nor any time clustering of events over an extended time window of $\pm3$ months. The non-detection is used to constrain isotropic-equivalent high-energy neutrino emission from GW170104 to less than $\sim4\times 10^{54}$ erg for a $E^{-2}$ spectrum

The ANTARES Collaboration: Contributions to ICRC 2017 Part I: Neutrino astronomy (diffuse fluxes and point sources)

Papers on neutrino astronomy (diffuse fluxes and point sources, prepared for the 35th International Cosmic Ray Conference (ICRC 2017, Busan, South Korea) by the ANTARES Collaboratio

The ANTARES Collaboration: Contributions to ICRC 2017 Part III: Searches for dark matter and exotics, neutrino oscillations and detector calibration

Papers on the searches for dark matter and exotics, neutrino oscillations and detector calibration, prepared for the 35th International Cosmic Ray Conference (ICRC 2017, Busan, South Korea) by the ANTARES Collaboratio

The ANTARES Collaboration: Contributions to ICRC 2017 Part II: The multi-messenger program

Papers on the ANTARES multi-messenger program, prepared for the 35th International Cosmic Ray Conference (ICRC 2017, Busan, South Korea) by the ANTARES Collaboratio

The Antares Collaboration : Contributions to the 34th International Cosmic Ray Conference (ICRC 2015, The Hague)

The ANTARES detector, completed in 2008, is the largest neutrino telescope in the Northern hemisphere. Located at a depth of 2.5 km in the Mediterranean Sea, 40 km off the Toulon shore, its main goal is the search for astrophysical high energy neutrinos. In this paper we collect the 21 contributions of the ANTARES collaboration to the 34th International Cosmic Ray Conference (ICRC 2015). The scientific output is very rich and the contributions included in these proceedings cover the main physics results, ranging from steady point sources, diffuse searches, multi-messenger analyses to exotic physics

Search for muon-neutrino emission from GeV and TeV gamma-ray flaring blazars using five years of data of the ANTARES telescope

The ANTARES telescope is well-suited for detecting astrophysical transient neutrino sources as it can observe a full hemisphere of the sky at all times with a high duty cycle. The background due to atmospheric particles can be drastically reduced, and the point-source sensitivity improved, by selecting a narrow time window around possible neutrino production periods. Blazars, being radio-loud active galactic nuclei with their jets pointing almost directly towards the observer, are particularly attractive potential neutrino point sources, since they are among the most likely sources of the very high-energy cosmic rays. Neutrinos and gamma rays may be produced in hadronic interactions with the surrounding medium. Moreover, blazars generally show high time variability in their light curves at different wavelengths and on various time scales. This paper presents a time-dependent analysis applied to a selection of flaring gamma-ray blazars observed by the FERMI/LAT experiment and by TeV Cherenkov telescopes using five years of ANTARES data taken from 2008 to 2012. The results are compatible with fluctuations of the background. Upper limits on the neutrino fluence have been produced and compared to the measured gamma-ray spectral energy distribution.Comment: 27 pages, 16 figure