Dual-random ensemble method for multi-label classification of biological data

This paper presents a dual-random ensemble multi-label classification method for classification of multi-label data. The method is formed by integrating and extending the concepts of feature subspace method and random k-label set ensemble multi-label classification method. Experiemental results show that the developed method outperforms the exisiting multi-lable classification methods on three different multi-lable datasets including the biological yeast and genbase datasets.<br /

The Oldest Stars of the Extremely Metal-Poor Local Group Dwarf Irregular Galaxy Leo A

We present deep Hubble Space Telescope single-star photometry of Leo A in B, V, and I. Our new field of view is offset from the centrally located field observed by Tolstoy et al. (1998) in order to expose the halo population of this galaxy. We report the detection of metal-poor red horizontal branch stars, which demonstrate that Leo A is not a young galaxy. In fact, Leo A is as least as old as metal-poor Galactic Globular Clusters which exhibit red horizontal branches, and are considered to have a minimum age of about 9 Gyr. We discuss the distance to Leo A, and perform an extensive comparison of the data with stellar isochrones. For a distance modulus of 24.5, the data are better than 50% complete down to absolute magnitudes of 2 or more. We can easily identify stars with metallicities between 0.0001 and 0.0004, and ages between about 5 and 10 Gyr, in their post-main-sequence phases, but lack the detection of main-sequence turnoffs which would provide unambiguous proof of ancient (>10 Gyr) stellar generations. Blue horizontal branch stars are above the detection limits, but difficult to distinguish from young stars with similar colors and magnitudes. Synthetic color-magnitude diagrams show it is possible to populate the blue horizontal branch in the halo of Leo A. The models also suggest ~50% of the total astrated mass in our pointing to be attributed to an ancient (>10 Gyr) stellar population. We conclude that Leo A started to form stars at least about 9 Gyr ago. Leo A exhibits an extremely low oxygen abundance, of only 3% of Solar, in its ionized interstellar medium. The existence of old stars in this very oxygen-deficient galaxy illustrates that a low oxygen abundance does not preclude a history of early star formation.Comment: 44 pages, 18 figures, accepted for publication in the August 2002 issue of AJ. High resolution figures is available at http://www.astro.spbu.ru/staff/dio/preprints.htm

High frequency magnetic oscillations of the organic metal θ\theta-(ET)4_4ZnBr4_4(C6_6H4_4Cl2_2) in pulsed magnetic field of up to 81 T

De Haas-van Alphen oscillations of the organic metal $\theta$-(ET)$_4$ZnBr$_4$(C$_6$H$_4$Cl$_2$) are studied in pulsed magnetic fields up to 81 T. The long decay time of the pulse allows determining reliable field-dependent amplitudes of Fourier components with frequencies up to several kiloteslas. The Fourier spectrum is in agreement with the model of a linear chain of coupled orbits. In this model, all the observed frequencies are linear combinations of the frequency linked to the basic orbit $\alpha$ and to the magnetic-breakdown orbit $\beta$.Comment: 6 pages, 4 figure

Identifying Old Tidal Dwarf Irregulars

We examine the observational consequences of the two possible origins for irregular galaxies: formation from collapse of a primordial cloud of gas early in the age of the Universe, and formation from tidal tails in an interaction that could have occured any time in the history of the Universe. Because the formation from tidal tails could have occurred a long time ago, proximity to larger galaxies is not sufficient to distinguish tidal dwarfs from traditional dwarfs. We consider the effects of little or no dark matter on rotation speeds and the Tully-Fisher relationship, the metallicity-luminosity relationship, structure, and stellar populations. From these selection criteria, we identify a small list of dwarf irregular galaxies that are candidates for having formed as tidal dwarfs.Comment: ApJ, to appear September 20, 200

Temperature- and pressure-dependent metallic states in (BEDT-TTF)8[Hg4Br12(C6H5Br)2]

Temperature-driven metal-insulator and pressure-driven insulator-metal transitions observed in(BEDT-TTF)8[Hg4X12(C6H5Y)2]] with X = Y = Br are studied through band structure calculations based on X-ray crystal structure determination and Shubnikov-de Haas (SdH) oscillations spectra, respectively. In connection with chemical pressure effect, the transition, which is not observed for X = Cl, is due to gap opening linked to structural changes as the temperature decreases. Even though many body interactions can be inferred from the pressure dependence of the SdH oscillations spectra, all the data can be described within a Fermi liquid picture

Structure detection in the D1 CFHTLS deep field using accurate photometric redshifts: a benchmark

We investigate structures in the D1 CFHTLS deep field in order to test the method that will be applied to generate homogeneous samples of clusters and groups of galaxies in order to constrain cosmology and detailed physics of groups and clusters. Adaptive kernel technique is applied on galaxy catalogues. This technique needs none of the usual a-priori assumptions (luminosity function, density profile, colour of galaxies) made with other methods. Its main drawback (decrease of efficiency with increasing background) is overcame by the use of narrow slices in photometric redshift space. There are two main concerns in structure detection. One is false detection and the second, the evaluation of the selection function in particular if one wants "complete" samples. We deal here with the first concern using random distributions. For the second, comparison with detailed simulations is foreseen but we use here a pragmatic approach with comparing our results to GalICS simulations to check that our detection number is not totally at odds compared to cosmological simulations. We use XMM-LSS survey and secured VVDS redshifts up to z~1 to check individual detections. We show that our detection method is basically capable to recover (in the regions in common) 100% of the C1 XMM-LSS X-ray detections in the correct redshift range plus several other candidates. Moreover when spectroscopic data are available, we confirm our detections, even those without X-ray data.Comment: 14 pages, 22 additionnal jpeg figures, accepted in A&

Geochemical features of Sakhalin Island mud volcanoes

The study, based on a complex geochemical research, found that the composition of the most chemical elements in mud breccia from the Yuzhno-Sakhalinsky (YSMV) and Pugachevsky (PMV) mud volcanoes (Sakhalin Island), the unique phenomena of endogenous defluidization in the Hokkaido-Sakhalin fold system (alpine-type folding), are comparable to Clark (C) contents of these elements (0.8-1.2 ×C). For Na, Li, Zn andSn, the ratio between the elemental contentsand their Clarke values (Csample/Clark value) vary from 1.4 to 5.2 xC. But the increased contents of Na and Li are due to the ascending endogenous fluid revealed. Study of the mud breccia chemical composition changes in different explosive activity of YSMV under the seismic activity variationsallowed to establish that, when the mud-volcanic gryphonsare activated against the background of increase in the temperature of the water-mud mixture and the emission of spontaneous gases, the contents of a number of elements (iron, calcium, manganese, rare earth elements, etc.) are decreased. This is explained by the formation of soluble hydrocarbonate complexes. Daginskiegasgeothermal system (DGHS) trace elements depletedooze samples were compared with YSMV and PMVsamples and exposedthat thehigh ratios of Csample /Clarke values for the majority of elements do not exceed 0.6 × C.Ooze samples from DGHS having higher elemental contents than Clark contents were observed only for Cd content (2.2-3.4 ×C) and Pb (0.7-1.5 ×C). Analysis of diatom flora on the DGHS site indicates the existence of an active fluid dynamic system that drains oil and gas bearing complexes. The factors determining the "weighting" of the methane carbon isotope composition in the southern part of Sakhalin Island are the increased seismic activity of deep-seated faults, as well as the presence of intrusions (diabase) and metamorphically altered rocks.References Aliyev A.A., Guliyev I.S., Rakhmanov R.R., 2009. Catalog of eruptions of Azerbaijan mud volcanoes (1810-2007). Baku Nafta-Press, 109p. Astakhov A.S., et al., 2002. Defluitization process dynamic of the Central Sakhalin fault at seismic activization (by monitoring results of the Yuzhno-Sakhalinsky mud volcano in July - August 2001) DAN 2002, 386(2), 223-228. Decisions of operational interdepartmental regional stratigraphical meetings on the Paleogene and Neogene of east regions of Russia-Kamchatka, Koryak Upland, Sakhalin and Kuril Islands, 1998. An explanatory note to stratigraphical schemes. Responsible editor Gladenkov Y.B. Moscow GEOS, 147p. Diatomic algae of the USSR (fossil and modern), 1974. Leningrad Nauka, 1(1), 404p. Dubinin A.V., 2006. Geochemistry of rare-earth elements in the ocean. Moscow Nauka, 360p. Ershov V.V., Shakirov R.B., Obzhirov A.I., 2011. Isotope and geochemical characteristics of the Yuzhno-Sakhalinsky mud volcano free gases and their connection with regional seismicity. DAN, 440(2), 256-261. Fedorov Y.N., et al., 2012. Crude oil microelement characteristic of Vogulkinsky and Tyumen basins oil and gas area: comparison. Lithosphere, 2, 141-151. Geology of the USSR, 33. Sakhalin Island/Under the edited by Sidorenko A.V. Moscow Nedra, 1970, 464p. Grigoriev N. A., 2008. About clark content of chemical elements in the top part of continental crust. Lithosphere 1, 61-71. Thesis: 11.00.00. Yuzhno-Sakhalinsk, IMGG FEB RAS, 244p. Hasle G.R., Syvertsen E.E., 1996. Marine diatoms. Identifying Marine Phytoplankton. San Diego, Academic Press, 5-385. Horita J., 2001. Carbon isotope exchange in the system CO2-CH4 at elevated temperatures. Geochimica et Cosmochimca Acta, 65, 1907-1919. Kholodov V.N., 2002. Mud volcanoes: distribution regularities and genesis. Lithology and Mineral Resources, 3, 227-22001.41. Kopf A.J., 2002. Significance of mud volcanism. Rev. Geophys, 40(2), 2-1-2-52. Liu Chia-Chuan, et al., 2013. The geochemical characteristics of the mud liquids in the Wushanting and Hsiaokunshui Mud Volcano region in southern Taiwan: Implications of humic substances for binding and mobilization of arsenic. Journal of Geochemical Exploration, 128, 62-71. Lobodenko I.Y., 2010. Holocenic tectonic deformations (paleoseismodislocations) in zones of the Hokkaido-Sakhalin and Central Sakhalin faults. Candidate of geological and mineralogical science thesis. Moscow, 22p. Melnikov O.A., 1987. Structure and geodynamics of the Hokkaido-Sakhalin folded region. Moscow Nauka, 93p. Melnikov O.A., 2011. About dynamics and nature of Pugachevsky group the gaswaterclastic ("mud") volcanoes on Sakhalin according to visual observations and an orohydrography. Volcanology and Seismology, 6, 47-59. Melnikov O.A., Ershov V.V., Kim Chong Un, etc., 2008.  About the mud spring activity dynamic of the gaswaterclastic ("mud") volcanoes and its connection with seismicity on the example of the Yuzhno-Sakhalinsky volcano (Sakhalin Island). Pacific Geology 27(5), 25-41. Melnikov O.A., Iliev A.Y., 1989. About new manifestations of mud volcanism on Sakhalin Island. Pacific geology 3, 42-48. Milkov, A.V., 2000. Worldwide distribution of submarine mud volcanoes and associated gas hydrates. Marine Geology 167, 29-42. Oreshkin V.N., Gordeev V.V., 1983. Geochemistry of cadmium and plumbum in suspension of the rivers of Black, Azov and Caspian Sea areas. Geochemistry, 4, 603-613. Petelin V.P., 1957. Mineralogy of sand-aleurite fractions in the Sea of Okhotsk marine sediments. Proceedings of Oceanology Institute of USSR Academy of Sciences, XXII. Prasolov E.M., 1990. Isotope geochemistry and origin of natural gases. St. Petersburg: Nedra, 283p. Shakirov R.B., 2016. Gasgeochemical fields of the marginal seas on the Far Eastern Region: distribution, origin, relations to the geological structures, gashydrates and seismo-tectonics. Dissertation of Doctor of Geological and Mineralogical Sciences (Dr.Sci.). POI FEB RAS, Vladivostok 459p. (In Russian). Shakirov R.B., Syrbu N.C., Obzhirov A.I., 2012. Isotope and gas-geochemical features of methane and carbon dioxide distribution on Sakhalin Island and adjacent shelf of the Okhotsk Sea. Bulletin of KRAESC Earth Sciences, 2(20), 100-113. Shnyukov E.V., et al., 1992. Mud volcanism of the Kerch and Tamansky region. Kiev, Naukova dumka, 200p. Siryk I.M., 1968. Oil and gas content of the east slopes of the West Sakhalin mountains. Moscow: Nauka, 8-14. Sorochinskaya A.V., et al., 2008. Geochemical and mineralogical features of mud volcanoes of Sakhalin Island. Bulletin of FEB RAS, 4, 58-65. Veselov О.V., Soinov V.V., 1997. Tektonosphere geodynamics of conjaction zone of the Pacific Ocean with Eurasia. Yuzhno Sakhalinsk: IMGG FEB RAS 4, 153-176. Veselov O.V., Volgin P.F., Lutaya L.M., 2012.  Structure of the Pugachevsky mud-volcano sedimentary cover (Sakhalin Island) by geophysical modeling data. Pacific Geology, 31(6), 4-15. Vinogradov A.P., 1962. Average contents of chemical elements in the main types the igneous rocks. Geochemistry, 7, 555-571. Yakubov A.A., et al., 1980. Mud volcanism of the Soviet Union and its connection with oil-and-gas content. Baku, 165p. Zharov A.E., Mitrofanova L.I., Tuzov V.P., 2013. Stratigraphy of Cainozoic sedoiments of the Northern Sakhalin shelf. Stratigraphy, Geological correlation 21(5), 72-93