All Outputs (691)

Constraining sub-grid physics with high-redshift spatially-resolved metallicity distributions (2013)
Journal Article
Gibson, B. K., Pilkington, K., Brook, C. B., Stinson, G. S., & Bailin, J. (2013). Constraining sub-grid physics with high-redshift spatially-resolved metallicity distributions. Astronomy and Astrophysics, 554, A47. https://doi.org/10.1051/0004-6361/201321239

Aims. We examine the role of energy feedback in shaping the distribution of metals within cosmological hydrodynamical simulations of L*disc galaxies. While negative abundance gradients today provide a boundary condition for galaxy evolution models, i... Read More about Constraining sub-grid physics with high-redshift spatially-resolved metallicity distributions.

Ultrafast dynamical path for the switching of a ferrimagnet after femtosecond heating (2013)
Journal Article
Atxitia, U., Ostler, T., Barker, J., Evans, R. F., Chantrell, R. W., & Chubykalo-Fesenko, O. (2013). Ultrafast dynamical path for the switching of a ferrimagnet after femtosecond heating. Physical review B: Condensed matter and materials physics, 87(22), https://doi.org/10.1103/PhysRevB.87.224417

Ultrafast laser-induced magnetic switching in rare earth-transition metal ferrimagnetic alloys has recently been reported to occur by ultrafast heating alone. Using atomistic simulations and a ferrimagnetic Landau-Lifshitz-Bloch formalism, we demonst... Read More about Ultrafast dynamical path for the switching of a ferrimagnet after femtosecond heating.

On the internal pollution mechanisms in the globular cluster NGC 6121(M4): Heavy-element abundances and AGB models (2013)
Journal Article
D’Orazi, V., Campbell, S. W., Lugaro, M., Lattanzio, J. C., Pignatari, M., & Carretta, E. (2013). On the internal pollution mechanisms in the globular cluster NGC 6121(M4): Heavy-element abundances and AGB models. Monthly notices of the Royal Astronomical Society, 433(1), 366-381. https://doi.org/10.1093/mnras/stt728

Globular clusters display significant variations in their light-element content, pointing to the existence of a second stellar generation formed from the ejecta of an earlier generation. The nature of these internal polluters is still a matter of deb... Read More about On the internal pollution mechanisms in the globular cluster NGC 6121(M4): Heavy-element abundances and AGB models.

Measurement of the reaction 17O(α,n)20Ne and its impact on the s process in massive stars (2013)
Journal Article
Best, A., Beard, M., Görres, J., Couder, M., Deboer, R., Falahat, S., Güray, R. T., Kontos, A., Kratz, K.-L., Leblanc, P. J., Li, Q., O'Brien, S., Özkan, N., Pignatari, M., Sonnabend, K., Talwar, R., Tan, W., Uberseder, E., & Wiescher, M. (2013). Measurement of the reaction 17O(α,n)20Ne and its impact on the s process in massive stars. Physical Review C - Nuclear Physics, 87(4), Article 045805. https://doi.org/10.1103/physrevc.87.045805

Background: The ratio between the rates of the reactions 17O ( α , n ) 20Ne and 17O ( α , γ ) 21Ne determines whether 16O is an efficient neutron poison for the s process in massive stars, or if most of the neutrons captured by 16O(n,γ) are recycled... Read More about Measurement of the reaction 17O(α,n)20Ne and its impact on the s process in massive stars.

Abundances of neutron-capture elements in stars of the Galactic disk substructures (2013)
Journal Article
Mishenina, T. V., Pignatari, M., Korotin, S. A., Soubiran, C., Charbonnel, C., Thielemann, F.-K., Gorbaneva, T. I., & Basak, N. Y. (2013). Abundances of neutron-capture elements in stars of the Galactic disk substructures. Astronomy and Astrophysics, 552, A128. https://doi.org/10.1051/0004-6361/201220687

Aims. The aim of this work is to present and discuss the observations of the iron peak (Fe, Ni) and neutron-capture element (Y, Zr, Ba, La, Ce, Nd, Sm, and Eu) abundances for 276 FGK dwarfs, located in the Galactic disk with metallicity-1 < [Fe/H]... Read More about Abundances of neutron-capture elements in stars of the Galactic disk substructures.

Geometric properties of acoustic waves generated by a point source in the solar-like interior: Effects of acoustic cutoff frequency (2013)
Journal Article
Zharkov, S. (2013). Geometric properties of acoustic waves generated by a point source in the solar-like interior: Effects of acoustic cutoff frequency. Monthly notices of the Royal Astronomical Society, 431(4), 3414-3428. https://doi.org/10.1093/mnras/stt420

Acoustic waves generated by a point source in stratified plasma are considered in this paper. An analytical parametric solution for a monochromatic source is derived for the plane-parallel polytrope model of the solar interior. The solution is used t... Read More about Geometric properties of acoustic waves generated by a point source in the solar-like interior: Effects of acoustic cutoff frequency.

Analysis of rich inelastic electron tunneling spectra: Case study of terthiophene on Au(111) (2013)
Journal Article
Koslowski, B., Maurer, N., Stocker, M., Chulkov, S. K., Benoit, D. M., & Ziemann, P. (2013). Analysis of rich inelastic electron tunneling spectra: Case study of terthiophene on Au(111). Review of scientific instruments, 84(4), 043907. https://doi.org/10.1063/1.4803008

Even moderately small molecules like 2,2′:5′,2″- terthiophene exhibit quite rich vibrational spectra. Detection and assignment of vibronic transitions of such a single adsorbed molecule in inelastic electron tunneling spectroscopy (IETS) using scanni... Read More about Analysis of rich inelastic electron tunneling spectra: Case study of terthiophene on Au(111).

Production of carbon-rich presolar grains from massive stars (2013)
Journal Article
Pignatari, M., Wiescher, M., Timmes, F., De Boer, R. J., Thielemann, F. K., Fryer, C., Heger, A., Herwig, F., & Hirschi, R. (2013). Production of carbon-rich presolar grains from massive stars. Astrophysical journal. Letters, 767(2), Article L22. https://doi.org/10.1088/2041-8205/767/2/L22

About a year after core-collapse supernova, dust starts to condense in the ejecta. In meteorites, a fraction of C-rich presolar grains (e.g., silicon carbide (SiC) grains of Type-X and low density graphites) are identified as relics of these events,... Read More about Production of carbon-rich presolar grains from massive stars.

Photothermal colloid antibodies for shape-selective recognition and killing of microorganisms (2013)
Journal Article
Borovička, J., Metheringham, W. J., Madden, L. A., Walton, C. D., Stoyanov, S. D., & Paunov, V. N. (2013). Photothermal colloid antibodies for shape-selective recognition and killing of microorganisms. Journal of the American Chemical Society, 135(14), 5282-5285. https://doi.org/10.1021/ja400781f

We have developed a class of selective antimicrobial agents based on the recognition of the shape and size of the bacterial cells. These agents are anisotropic colloid particles fabricated as negative replicas of the target cells which involve templa... Read More about Photothermal colloid antibodies for shape-selective recognition and killing of microorganisms.

Self-assembly of two-dimensional colloidal clusters by tuning the hydrophobicity, composition, and packing geometry (2013)
Journal Article
Law, A. D., Auriol, M., Smith, D., Horozov, T. S., & Buzza, D. M. A. (2013). Self-assembly of two-dimensional colloidal clusters by tuning the hydrophobicity, composition, and packing geometry. Physical review letters, 110(13), 0 - 0. https://doi.org/10.1103/physrevlett.110.138301

We study the structure of binary monolayers of large (3 m diameter) very hydrophobic (A) and large (3 m diameter) hydrophilic (B) or small (1 m diameter) hydrophilic (C) silica particles at an octanewater interface. By tuning the composition and pack... Read More about Self-assembly of two-dimensional colloidal clusters by tuning the hydrophobicity, composition, and packing geometry.

Investigation of the gate oxide leakage current of low temperature formed hafnium oxide films (2013)
Journal Article
Verrelli, E., & Tsoukalas, D. (2013). Investigation of the gate oxide leakage current of low temperature formed hafnium oxide films. Journal of applied physics, 113(11), Article 114103. https://doi.org/10.1063/1.4795278

In this work, low temperature physically deposited hafnium oxide films are investigated in terms of their electrical properties through measurements and analysis of leakage currents in order to understand the defects behavior in this dielectric mater... Read More about Investigation of the gate oxide leakage current of low temperature formed hafnium oxide films.

Using visualization for visualization : an ecological interface design approach to inputting data (2013)
Journal Article
Wright, H., Mathers, C., & Walton, J. P. R. B. (2013). Using visualization for visualization : an ecological interface design approach to inputting data. Computers and Graphics, 37(3), 202-213. https://doi.org/10.1016/j.cag.2013.01.013

Visualization is experiencing growing use by a diverse community, with continuing improvements in the availability and usability of systems. In spite of these developments the problem of how first to get the data in has received scant attention: the... Read More about Using visualization for visualization : an ecological interface design approach to inputting data.

Kelvin-Helmholtz instabilities at the sloshing cold fronts in the Virgo cluster as a measure for the effective ICM viscosity (2013)
Journal Article
Roediger, E., Kraft, R. P., Forman, W. R., E. J. Nulsen, P., & Churazov, E. (2013). Kelvin-Helmholtz instabilities at the sloshing cold fronts in the Virgo cluster as a measure for the effective ICM viscosity. The Astrophysical journal, 764(1), Article 60. https://doi.org/10.1088/0004-637X/764/1/60

Sloshing cold fronts (CFs) arise from minor merger triggered gas sloshing. Their detailed structure depends on the properties of the intra-cluster medium (ICM): hydrodynamical simulations predict the CFs to be distorted by Kelvin-Helmholtz instabilit... Read More about Kelvin-Helmholtz instabilities at the sloshing cold fronts in the Virgo cluster as a measure for the effective ICM viscosity.

Neutron capture cross section of unstable Ni63: Implications for stellar nucleosynthesis (2013)
Journal Article
Wallner, A., Vlastou, R., Vlachoudis, V., Vermeulen, M. J., Versaci, R., Ventura, A., Vaz, P., Lederer, C., Massimi, C., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Bosnar, D., …Variale, V. (2013). Neutron capture cross section of unstable Ni63: Implications for stellar nucleosynthesis. Physical review letters, 110(2), Article 022501. https://doi.org/10.1103/physrevlett.110.022501

The Ni63(n,γ) cross section has been measured for the first time at the neutron time-of-flight facility n-TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian averaged c... Read More about Neutron capture cross section of unstable Ni63: Implications for stellar nucleosynthesis.

Biosynthesis of luminescent quantum dots in an earthworm (2012)
Journal Article
Stürzenbaum, S. R., Höckner, M., Panneerselvam, A., Levitt, J., Bouillard, J. S., Taniguchi, S., Dailey, L. A., Khanbeigi, R. A., Rosca, E. V., Thanou, M., Suhling, K., Zayats, A. V., & Green, M. (2013). Biosynthesis of luminescent quantum dots in an earthworm. Nature nanotechnology, 8(1), 57-60. https://doi.org/10.1038/nnano.2012.232

The synthesis of designer solid-state materials by living organisms is an emerging field in bio-nanotechnology. Key examples include the use of engineered viruses as templates for cobalt oxide (Co3O4) particles1, superparamagnetic cobalt–platinum all... Read More about Biosynthesis of luminescent quantum dots in an earthworm.

The drivers of AGN activity in galaxy clusters: AGN fraction as a function of mass and environment (2012)
Journal Article
Pimbblet, K. A., Shabala, S. S., Haines, C. P., Fraser-McKelvie, A., & Floyd, D. J. E. (2013). The drivers of AGN activity in galaxy clusters: AGN fraction as a function of mass and environment. Monthly notices of the Royal Astronomical Society, 429(2), 1827-1839. https://doi.org/10.1093/mnras/sts470

We present an analysis of optical spectroscopically identified active galactic nuclei (AGN) down to a cluster magnitude of M * + 1 in a sample of six self-similar Sloan Digital Sky Survey galaxy clusters at z ~ 0.07. These clusters are specifically s... Read More about The drivers of AGN activity in galaxy clusters: AGN fraction as a function of mass and environment.

The 12C +12C reaction and the impact on nucleosynthesis in massive stars (2012)
Journal Article
Pignatari, M., Hirschi, R., Wiescher, M., Gallino, R., Bennett, M., Beard, M., Fryer, C., Herwig, F., Rockefeller, G., & X. Timmes, F. (2013). The 12C +12C reaction and the impact on nucleosynthesis in massive stars. The Astrophysical journal, 762(1), Article 31. https://doi.org/10.1088/0004-637X/762/1/31

Despite much effort in the past decades, the C-burning reaction rate is uncertain by several orders of magnitude, and the relative strength between the different channels 12 C( 12 C, α) 20 Ne, 12 C( 12 C, p) 23 Na, and 12 C( 12 C, n) 23 Mg is poorly... Read More about The 12C +12C reaction and the impact on nucleosynthesis in massive stars.

The stellar metallicity distribution of disc galaxies and bulges in cosmological simulations (2012)
Journal Article
Calura, F., Gibson, B. K., Michel-Dansac, L., Stinson, G. S., Cignoni, M., Dotter, A., Pilkington, K., House, E. L., Brook, C. B., Few, C. G., Bailin, J., Couchman, H. M. P., & Wadsley, J. (2012). The stellar metallicity distribution of disc galaxies and bulges in cosmological simulations. Monthly notices of the Royal Astronomical Society, 427(2), 1401-1417. https://doi.org/10.1111/j.1365-2966.2012.22052.x

By means of high-resolution cosmological hydrodynamical simulations of Milky Way (MW) like disc galaxies, we conduct an analysis of the associated stellar metallicity distribution functions (MDFs). After undertaking a kinematic decomposition of each... Read More about The stellar metallicity distribution of disc galaxies and bulges in cosmological simulations.

17O(α,γ)21Ne and17O(α, n)20Ne for the weak s process (2012)
Presentation / Conference Contribution
Best, A., Görres, J., Beard, M., Couder, M., deBoer, R., Falahat, S., Güray, R. T., Kontos, A., Kratz, K.-L., LeBlanc, P. J., Li, Q., O'Brien, S., Özkan, N., Pignatari, M., Sonnabend, K., Talwar, R., Tan, W., Uberseder, E., & Wiescher, M. 17O(α,γ)21Ne and17O(α, n)20Ne for the weak s process. Presented at EXOTIC NUCLEI AND NUCLEAR/PARTICLE ASTROPHYSICS (IV). FROM NUCLEI TO STARS: Carpathian Summer School of Physics 2012, Sinaia, Romania

The ratio of the reaction rates of the competing channels 17 O(αγ) 21 Ne and 17 O(α,n) 20 Ne determines the efficiency of 16 O as a neutron poison in the s process in low metallicity rotating stars. It has a large impact on the element production, ei... Read More about 17O(α,γ)21Ne and17O(α, n)20Ne for the weak s process.

Towards an understanding of the vibrational spectrum of the neutral Au7cluster (2012)
Journal Article
Mancera, L. A., & Benoit, D. M. (2013). Towards an understanding of the vibrational spectrum of the neutral Au7cluster. Physical chemistry chemical physics : PCCP, 15(6), 1929-1943. https://doi.org/10.1039/c2cp43211k

We present a detailed theoretical study of the vibrational spectrum of the neutral Au 7 cluster, aimed at understanding its reported experimental spectrum [P. Gruene et al., Science, 2008, 321, 674]. We study the effect of vibrational anharmonicity,... Read More about Towards an understanding of the vibrational spectrum of the neutral Au7cluster.