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Spin and Charge Ordering in La1-xCaxMnO3 (x = 0.5 and 0.6) Thin Films
V. G. Prokhorov,박정수,K. K. Yu,S. Y. Park,V. A. Komashko,V. L. Svetchnikov,이영백 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
The magnetic and the transport properties of La0.5Ca0.5MnO3 and La0.4Ca0.6MnO3 films with different thickness were investigated. The electron-diffraction study showed that the charge-ordered phase was observed at room temperature for both films. A paramagnetic-to-ferromagnetic (FM) transition at TC 250 K upon cooling in the La0.5Ca0.5MnO3 films and an antiferromagnetic (AFM) phase appeared at TN . 140 K. In the La0.4Ca0.6MnO3 films only the AFM transition was observed at the same temperature. For the La0.5Ca0.5MnO3 film, the FM phase was shown to coexist with the AFM one at low temperatures, and the volume fraction of the FM phase did not exceed 30 %. The magnetoresistive properties of both films could be explained in the framework of the spin-assisted polaron-hopping model.
Polymorphic stages of the fresh water blue-green alga, Gomphosphaeria aponina
V. K. Dwivedi,Richa Tandon,G. L. Tiwari 한국조류학회I 2010 ALGAE Vol.25 No.3
The natural growth of a population of Gomphosphaeria aponina Kützing (Chroococcales, Cyanoprocaryota) was studied in a cemented freshwater tank in Allahabad, India. This population appeared to be a polymorphic species. Different species of the genus Gomphosphaeria have been segregated based on morphological features of colonies, cells and mucilage. However, these features are not well defined for different species. Our observations revealed many feature variations and, interestingly, certain features that have been described for different Gomphosphaeria species were seen in a single population. In this study, records of such variable morphological features were possible due to the availability of numerous specimens and continuous observations for more than two years. Further, this study revealed two points:(i) more detailed morphological studies are required both from nature as well as in culture to identify critical differences among the species, and (ii) molecular characterization of taxa appears to be necessary for final species settlement.
K. B. Padmakumar,B. R. Smitha,Lathika Cicily Thomas,C. L. Fanimol,G. SreeRenjima,N. R. Menon,V. N. Sanjeevan 한국해양과학기술원 2010 Ocean science journal Vol.45 No.3
This study presents in situ evidence for the blooms of Trichodesmium erythraeum observed in the shelf waters of the South Eastern Arabian Sea (SEAS) during the onset of the southwest monsoon in June 2009. Evidence showed that water surface discoloration was caused by the accumulation of T. erythraeum, and that the water column contained a colony of T. thiebautii. The surface water color in the bloom region varied from pale brown to pinkish red. Pale brown indicated healthy algae at the peak of its photosynthetic activity, while pinkish red indicated the presence of photosynthetically less active filaments. Zooplankton abundance, especially copepodites, in the bloom area substantiated the theory that Trichodesmium filaments are excellent epiphytes to which the copepodites cling. The bloom area was very fertile with copious quantities of dissolved oxygen (6.85 ml L-1), PO4-P (0.108 μmol L-1) and SiO4 (1.29 μmol L-1). Lower NO3-N (0.028 μmol L-1) values in the bloom area did not appear to affect Trichodesmium growth from molecular nitrogen fixation. However, lower NO3-N values altered the normal phytoplankton composition of this area.
Search for theX(4140)state inB+→J/ψϕK+decays with the D0 detector
Abazov, V. M.,Abbott, B.,Acharya, B. S.,Adams, M.,Adams, T.,Agnew, J. P.,Alexeev, G. D.,Alkhazov, G.,Alton, A.,Askew, A.,Atkins, S.,Augsten, K.,Avila, C.,Badaud, F.,Bagby, L.,Baldin, B.,Bandurin, D. V American Physical Society 2014 PHYSICAL REVIEW D - Vol.89 No.1
<P>We investigate the decay B+ -> J/psi phi K+ in a search for the X(4140) state, a narrow threshold resonance in the J/psi phi system. The data sample corresponds to an integrated luminosity of 10.4 fb(-1) of p (p) over bar collisions at root s = 1.96 TeV collected by the D0 experiment at the Fermilab Tevatron collider. We observe a mass peak with a statistical significance of 3.1 standard deviations and measure its invariant mass to be M = 4159.0 +/- 4.3(stat) +/- 6.6(syst) MeV and its width to be Gamma = 19.9 +/- 12.6(stat)(-8.0)(+3.0)(syst) MeV.</P>
Singh, V.,Sivaramaiah, G.,Rao, J. L.,Singh, N.,Mohapatra, M.,Singh, P. K.,Pathak, M. S.,Dhoble, S. J. Minerals, Metals & Materials Society and the Insti 2017 Journal of Electronic Materials Vol. No.
<P>LiAl5O8 doped with Fe was synthesized by a propellant combustion route at furnace temperature of 773 K. The phosphor was characterized using powder x-ray diffraction, optical absorption, electron paramagnetic resonance (EPR) and photoluminescence spectroscopic techniques. The optical absorption spectrum exhibits a broad band at 242 nm characteristic of charge transfer between Fe3+-O2-. On excitation with 293 nm, emission band for the Fe3+ ion was observed at 687 nm. The CIE (International Commission on Illumination or Commission Internationale de l'Elcairage) coordinates for the system were evaluated adopting standard procedure which suggested that the system can be effective as a deep red emitting phosphor. The EPR spectrum of this phosphor exhibits a number of resonance signals characteristic of Fe3+ ions. The resonance signals at g = 3.16, 2.27 are attributed to Fe3+ present at tetrahedral site with an axial symmetry. The resonance signals at g = 1.98 and 1.43 are attributed to Fe3+ ions in octahedral site with an axial symmetry. Various EPR parameters such as the number of spins, Gibbs free energy, magnetic susceptibility, Curie constant and effective magnetic moment values are calculated and compared at room temperature and 110 K.</P>
Kumar, K.N.,R., P.,L., V.,Kang, M. Korean Society of Industrial and Engineering Chemi 2017 Journal of industrial and engineering chemistry Vol.45 No.-
<P>Red emission was obtained from rare earth doped polymer nanocomposites, namely, composites of polyvinyl-alcohol (PVA) co-doped with Gd3+ and Eu3+ and embedded with TiO2 nanoparticles (TiO2NP), under ultraviolet (UV) excitation. We successfully synthesized Eu3+: PVA, Gd3+: PVA, (Gd3+ + Eu3+): PVA, and (Gd3++ Eu3+ +TiO2NP): PVA films by solution casting method. From X-ray diffraction patterns and Fourier-transform infrared spectral profiles, the structural details of the films and the ion-polymer interaction mechanism responsible for their formation were systematically analyzed. The thermal stability and decomposition dynamics of the prepared samples were evaluated by thermogravimetry and differential thermal analysis. Pertinent optical absorption bands related to Eu3+ and Gd3+ ions in the polymer composites were observed and assigned to the corresponding electronic transitions. The PVA film containing different concentrations of the Eu3+ dopant displayed red emission at 618 nm (D-5(0) -> F-7(2)) under UV excitation at 396 nm (F-7(0) -> L-5(6)). Upon co-doping with Gd3+ to form the (Gd3+ + Eu3+): PVA film, it exhibited red emission that was stronger than that from the singly doped Eu3+: PVA film under 270 nm excitation because of the energy transfer from Gd3+ to Eu3+ ions. After the TiO2 nanoparticles were evenly dispersed in the co-doped (Gd3+ + Eu3+): PVA films, the photoluminescence properties were remarkably enhanced and prominent red emission was observed under 274 nm excitation. The red emission of Eu3+ was significantly enhanced through an efficient energy-transfer process from the Gd3+ ions to Eu3+ ions and from the TiO2 nanoparticles to Eu3+ ions. A possible energy-transfer mechanism was clearly demonstrated by several fluorescent methods and lifetime decay dynamics. Based on the above results, these polymer composite films are promising candidates for red luminescent photonic devices. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Dondini, L.,Pierantoni, L.,Ancarani, V.,D’Angelo, M.,Cho, K.-H.,Shin, I.-S.,Musacchi, S.,Kang, S.-J.,Sansavini, S. Blackwell Publishing Ltd 2008 Plant breeding Vol.127 No.5
<P>Abstract</P><P>The inheritance of the red colour character in European pear (<I>Pyrus communis</I> L.) was studied over 3 years in seven progeny obtained by using the cultivars ‘Max Red Bartlett’, ‘Cascade’ and ‘California’ as red-skinned fruit parental lines. One of these progeny (derived from the cross ‘Abbé Fétel’ × ‘Max Red Bartlett’, a red mutation of ‘Bartlett’) was already used to construct two linkage maps and, being ‘red colour’ a monogenic dominant trait, it was possible to locate it as morphological marker in the linkage group 4 of ‘Max Red Bartlett’. For the first time, this trait has been mapped out of linkage group 9 in a species belonging to the Maloideae subfamily moreover in a mutated sport. An improved knowledge of the genetic basis of production and accumulation of red pigments in the fruit skin will better support the pear breeding programmes aimed to select new cultivars carrying this appealing trait.</P>
Measurement of the In-MediumK0Inclusive Cross Section inπ−-Induced Reactions at1.15 GeV/c
Benabderrahmane, M. L.,Herrmann, N.,Wiś,niewski, K.,Kecskemeti, J.,Andronic, A.,Barret, V.,Basrak, Z.,Bastid, N.,Buehler, P.,Cargnelli, M.,Č,aplar, R.,Cordier, E.,Deppner, I.,Crochet, P.,Dup American Physical Society 2009 Physical Review Letters Vol.102 No.18
<P>The K0 meson production by pi(-) mesons of 1.15 GeV/c momentum on C, Al, Cu, Sn, and Pb nuclear targets was measured with the FOPI spectrometer at the Schwer-Ionen-Synchrotron accelerator of GSI. Inclusive production cross sections and the momentum distributions of K0 mesons are compared to scaled elementary production cross sections and to predictions of theoretical models describing the in-medium production of kaons. The data represent a new reference for those models, which are widely used for interpretation of the strangeness production in heavy-ion collisions. The presented results demonstrate the sensitivity of the kaon production to the reaction amplitudes inside nuclei and point to the existence of a repulsive KN potential of 20+/-5 MeV at normal nuclear matter density.</P>
MID-INFRARED PERIOD-METALLICITY-LUMINOSITY RELATIONS AND KINEMATICS OF RR LYRAE VARIABLES
DAMBIS, ANDREI K.,BERDNIKOV, L.N.,KNIAZEV, A. YU.,KRAVTSOV, V.V.,RASTORGUEV, A.S.,SEFAKO, R.,VOZYAKOVA, O.V.,ZABOLOTSKIKH, M.V. The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We use ALLWISE data release W1- and W2-band epoch photometry collected by the Wide-Field Infrared Survey Explorer (WISE) to determine slopes of the period-luminosity relations for RR Lyrae stars in 15 globular clusters in the corresponding bands. We further combine these results with V- and K-band photometry of Galactic field RR Lyrae stars to determine the metallicity slopes of the log $P_F-[Fe/H]-M_K$, log $P_F-[Fe/H]-M_{W1}$, and log $P_F-[Fe/H]-M_{W2}$ period-metallicity-luminosity relations. We infer the zero points of these relations and determine the kinematical parameters of thick-disk and halo RR Lyraes via statistical parallax, and estimate the RR Lyrae-based distances to 18 Local-Group galaxies including the center of the Milky Way.