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x110,oš,ix107,, Marija,Erakovix107,, Sanja,Jankovix107,, Ana,Vukax161,inovix107,-Sekulix107,, Maja,Matix107,, Ivana Z.,Stojanovix107,, Jovica,Rhee, Kyong Yop,Mix161,kovix107 Elsevier 2017 Journal of industrial and engineering chemistry Vol.47 No.-
<P><B>Abstract</B></P> <P>Graphene (Gr) and natural polymer chitosan (CS) were introduced to hydroxyapatite (HAP) to produce a three-component composite coating, which was fabricated by cathodic electrophoretic deposition on Ti substrates in an ethanol suspension. These HAP/CS/Gr coatings were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and electrochemical measurements and found that the graphene into HAP/CS composites significantly improves their morphology, thermal stability, and bioactivity. Both HAP/CS and HAP/CS/Gr composite coatings are classified as non-cytotoxic when tested against healthy peripheral blood mononuclear cells (PBMC), while antibacterial activity against <I>Staphylococcus aureus</I> and <I>Escherichia coli</I> could not be verified.</P>
Strength enhancement of high entropy alloy HfNbTaTiZr by severe plastic deformation
x10c,í,x17e,ek, J.,Haux161,ild, P.,Cieslar, M.,Melikhova, O.,Vlasá,k, T.,Janex10d,ek, M.,Krá,l, R.,Harcuba, P.,Luká,x10d,, F.,Zý,ka, J.,Má,lek, J.,Moon, J Elsevier 2018 Journal of alloys and compounds Vol.768 No.-
<P><B>Abstract</B></P> <P>Refractory metal high entropy alloy HfNbTaTiZr with ultrafine grained structure and grain size of ≈80 nm was processed by high pressure torsion. The development of microstructure, lattice defects and mechanical properties with increasing strain was examined. Grain refinement of HfNbTaTiZr alloy deformed up to the equivalent strain <I>e</I> ≈ 50 resulted in a significant enhancement of strength while keeping sufficient ductility. However, further straining <I>e</I> > 100 led to a decrease of strength and the loss of ductility due to the decomposition of solid solution facilitated by vacancies introduced by severe plastic deformation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High entropy alloy HfNbTaTiZr was nanostructured by high pressure torsion. </LI> <LI> Grain size of 80 nm was achieved by deformation to the equivalent strain e = 5. </LI> <LI> Structure refinement resulted in remarkable enhancement of strength of the alloy. </LI> <LI> Ductility remains sufficient for good workability. </LI> <LI> Further deformation to very high strains resulted in loss of strength. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
First analysis of solar structures in 1.21 mm full-disc ALMA image of the Sun
Brajx161,a, R.,Sudar, D.,Benz, A. O.,Skokix107,, I.,Bá,rta, M.,De Pontieu, B.,Kim, S.,Kobelski, A.,Kuhar, M.,Shimojo, M.,Wedemeyer, S.,White, S.,Yagoubov, P.,Yan, Y. Springer-Verlag 2018 Astronomy and astrophysics Vol.613 No.-
<P><I>Context.</I> Various solar features can be seen in emission or absorption on maps of the Sun in the millimetre and submillimetre wavelength range. The recently installed Atacama Large Millimetre/submillimetre Array (ALMA) is capable of observing the Sun in that wavelength range with an unprecedented spatial, temporal and spectral resolution. To interpret solar observations with ALMA, the first important step is to compare solar ALMA maps with simultaneous images of the Sun recorded in other spectral ranges.</P><P><I>Aims.</I> The first aim of the present work is to identify different structures in the solar atmosphere seen in the optical, infrared, and EUV parts of the spectrum (quiet Sun, active regions, prominences on the disc, magnetic inversion lines, coronal holes and coronal bright points) in a full-disc solar ALMA image. The second aim is to measure the intensities (brightness temperatures) of those structures and to compare them with the corresponding quiet Sun level.</P><P><I>Methods.</I> A full-disc solar image at 1.21 mm obtained on December 18, 2015, during a CSV-EOC campaign with ALMA is calibrated and compared with full-disc solar images from the same day in H<I>α</I> line, in He I 1083 nm line core, and with various SDO images (AIA at 170 nm, 30.4 nm, 21.1 nm, 19.3 nm, and 17.1 nm and HMI magnetogram). The brightness temperatures of various structures are determined by averaging over corresponding regions of interest in the calibrated ALMA image.</P><P><I>Results.</I> Positions of the quiet Sun, active regions, prominences on the disc, magnetic inversion lines, coronal holes and coronal bright points are identified in the ALMA image. At the wavelength of 1.21 mm, active regions appear as bright areas (but sunspots are dark), while prominences on the disc and coronal holes are not discernible from the quiet Sun background, despite having slightly less intensity than surrounding quiet Sun regions. Magnetic inversion lines appear as large, elongated dark structures and coronal bright points correspond to ALMA bright points.</P><P><I>Conclusions.</I> These observational results are in general agreement with sparse earlier measurements at similar wavelengths. The identification of coronal bright points represents the most important new result. By comparing ALMA and other maps, it was found that the ALMA image was oriented properly and that the procedure of overlaying the ALMA image with other images is accurate at the 5 arcsec level. The potential of ALMA for physics of the solar chromosphere is emphasised.</P>
The Belle II vertex detector integration
Kodyx161,, P.,Abudinen, F.,Ackermann, K.,Ahlburg, P.,Aihara, H.,Albalawi, M.,Alonso, O.,Andricek, L.,Ayad, R.,Aziz, T.,Babu, V.,Bacher, S.,Bahinipati, S.,Bai, Y.,Barberio, E.,Baroncelli, Ti.,Baronce Elsevier 2019 Nuclear Instruments & Methods in Physics Research. Vol.936 No.-
<P><B>Abstract</B></P> <P>The Belle II experiment comes with a substantial upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric <SUP> e + </SUP> <SUP> e − </SUP> collider with energies tuned to ϒ ( 4 S ) resonance s = 10 . 588 GeV. The accelerator has successfully completed the first phase of commissioning in 2016 and the first electron–positron collisions in Belle II took place in April 2018. Belle II features a newly designed silicon vertex detector based on DEPFET pixel and double-sided strip layers. Currently, a subset of the vertex detector is installed (Phase 2 of the experiment). Installation of the full detector (Phase 3) will be completed by the end of 2018.</P> <P>This paper describes the Phase 2 arrangement of the Belle II silicon vertex detector, with focus on the interconnection of detectors and their integration with the software framework of Belle II. Alignment issues are discussed based on detector simulations and first acquired data.</P>
Asteroid pairs: A complex picture
Pravec, P.,Fatka, P.,Vokrouhlický,, D.,Scheirich, P.,x10e,urech, J.,Scheeres, D.J.,Kux161,nirá,k, P.,Hornoch, K.,Galá,d, A.,Pray, D.P.,Krugly, Yu. N.,Burkhonov, O.,Ehgamberdiev, Elsevier 2019 Icarus Vol.333 No.-
<P><B>Abstract</B></P> <P>We studied a sample of 93 asteroid pairs, i.e., pairs of genetically related asteroids that are on highly similar heliocentric orbits. We estimated times elapsed since separation of pair members (i.e., pair age) that are between 7 × 10<SUP>3</SUP> yr and a few 10<SUP>6</SUP> yr. With photometric observations, we derived the rotation periods <I>P</I> <SUB>1</SUB> for all the primaries (i.e., the larger members of asteroid pairs) and a sample of secondaries (the smaller pair members). We derived the absolute magnitude differences of the studied asteroid pairs that provide their mass ratios <I>q</I>. For a part of the studied pairs, we refined their WISE geometric albedos and collected or estimated their taxonomic classifications. For 17 asteroid pairs, we also determined their pole positions. In two pairs where we obtained the spin poles for both pair components, we saw the same sense of rotation for both components and constrained the angles between their original spin vectors at the time of their separation. We found that the primaries of 13 asteroid pairs in our sample are actually binary or triple systems, i.e., they have one or two bound, orbiting secondaries (satellites). As a by-product, we found also 3 new young asteroid clusters (each of them consisting of three known asteroids on highly similar heliocentric orbits). We compared the obtained asteroid pair data with theoretical predictions and discussed their implications. We found that 86 of the 93 studied asteroid pairs follow the trend of primary rotation period vs mass ratio that was found by Pravec et al. (2010). Of the 7 outliers, 3 appear insignificant (may be due to our uncertain or incomplete knowledge of the three pairs), but 4 are high mass ratio pairs that were unpredicted by the theory of asteroid pair formation by rotational fission. We discuss a (remotely) possible way that they could be created by rotational fission of flattened parent bodies followed by re-shaping of the formed components. The 13 asteroid pairs with binary primaries are particularly interesting systems that place important constraints on formation and evolution of asteroid pairs. We present two hypotheses for their formation: The asteroid pairs having both bound and unbound secondaries could be “failed asteroid clusters”, or they could be formed by a cascade primary spin fission process. Further studies are needed to reveal which of these two hypotheses for formation of the paired binary systems is real.</P>
Titania nanopores with dual micro-/nano-topography for selective cellular bioactivity
Gulati, Karan,Moon, Ho-Jin,Li, Tao,Sudheesh Kumar, P.T.,Ivanovski, Sax161,o Elsevier 2018 Materials Science and Engineering C Vol.91 No.-
<P><B>Abstract</B></P> <P>This letter describes a simple surface modification strategy based on a single-step electrochemical anodization towards generating dual micro- and nano-rough horizontally-aligned TiO<SUB>2</SUB> nanopores on the surface of clinically utilized micro-grooved titanium implants. Primary macrophages, osteoblasts and fibroblasts were cultured on the nano-engineered implants, and it was demonstrated that the modified surfaces selectively reduced the proliferation of macrophages (immunomodulation), while augmenting the activity of osteoblasts (osseo-integration) and fibroblasts (soft-tissue integration). Additionally, the mechanically robust nanopores also stimulated osteoblast and fibroblast adhesion, attachment and alignment along the direction of the pores/grooves, while macrophages remained oval-shaped and sparsely distributed. This study for the first time reports the use of cost-effectively prepared nano-engineered titanium surface via anodization, with aligned multi-scale micro/nano features for selective cellular bioactivity, without the use of any therapeutics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Single-step fabrication of dual micro-rough and nanoporous titanium surfaces </LI> <LI> Mechanically robust aligned nanopores with preserved underlying micro-features </LI> <LI> Upregulated attachment and adhesion of osteoblasts and fibroblasts </LI> <LI> Reduced macrophage proliferation and adherence </LI> <LI> Osteoblasts and fibroblasts align parallel to the nanopore arrangement. </LI> </UL> </P>
Effects of magnetic anisotropy and exchange in Tm2Fe17
Pirogov, A. N.,Bogdanov, S. G.,Rosenfeld, E. V.,Park, J. -G.,Choi, Y. N.,Lee, Seongsu,Prokex161,, K.,Golosova, N. O.,Sashin, I. L.,Kudrevatykh, N. V.,Skryabin, Yu. N.,Vokhmyanin, A. P. Pleiades Publishing 2012 Journal of experimental and theoretical physics Vol.115 No.5
Chae, K.Y.,Ahn, S.,Ayres, A.,Bardayan, D.W.,Bey, A.,Greife, U.,Howard, M.E.,Jones, K.L.,Kozub, R.L.,Matoš,, M.,Moazen, B.H.,Nesaraja, C.D.,O’Malley, P.D.,Peters, W.A.,Pittman, S.T.,Smith, M.S. Elsevier 2018 Nuclear Instruments & Methods in Physics Research. Vol.900 No.-
<P><B>Abstract</B></P> <P>Direct measurements of ( α , p ) reactions of astrophysical interest with radioactive beams presents serious challenges because of the difficult nature of helium targets and the typical low intensities of the beams. To address this, a new technique has been developed for measurements of low-energy ( α , p ) reactions with heavy ion beams using an extended <SUP> 4 </SUP> He gas target and a newly developed gas recirculating system. The system was used to measure the <SUP> 4 </SUP> He(<SUP>19</SUP>F, <SUP> 1 </SUP> H)<SUP>22</SUP>Ne reaction as a demonstration. Excitation functions of the <SUP>19</SUP>F( α , p )<SUP>22</SUP>Ne and <SUP>19</SUP>F( α , <SUP> p ′ </SUP> )<SUP>22</SUP>Ne <SUP> ∗ </SUP> reactions were successfully measured to show the viability of this technique. Details of the approach and future plans are given.</P>