Search Results - (Author, Cooperation:D. C. Morton)
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1Latest Papers from Table of Contents or Articles in PressD. C. Morton ; J. Nagol ; C. C. Carabajal ; J. Rosette ; M. Palace ; B. D. Cook ; E. F. Vermote ; D. J. Harding ; P. R. North
Nature Publishing Group (NPG)
Published 2014Staff ViewPublication Date: 2014-02-07Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Artifacts ; Brazil ; Color ; *Droughts ; Ecosystem ; Fresh Water/analysis ; Models, Biological ; Photosynthesis ; Pigmentation/*physiology ; Plant Leaves/anatomy & histology/growth & development/*physiology ; Rain ; Satellite Imagery ; *Seasons ; *Sunlight ; Trees/anatomy & histology/growth & development/*physiology ; *Tropical ClimatePublished by: -
2Latest Papers from Table of Contents or Articles in PressD. C. Morton ; J. Nagol ; C. C. Carabajal ; J. Rosette ; M. Palace ; B. D. Cook ; E. F. Vermote ; D. J. Harding ; P. R. North
Nature Publishing Group (NPG)
Published 2016Staff ViewPublication Date: 2016-03-18Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: *Droughts ; Pigmentation/*physiology ; Plant Leaves/*physiology ; *Seasons ; *Sunlight ; Trees/*physiology ; *Tropical ClimatePublished by: -
3Latest Papers from Table of Contents or Articles in PressY. Chen ; J. T. Randerson ; D. C. Morton ; R. S. DeFries ; G. J. Collatz ; P. S. Kasibhatla ; L. Giglio ; Y. Jin ; M. E. Marlier
American Association for the Advancement of Science (AAAS)
Published 2011Staff ViewPublication Date: 2011-11-15Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
4Latest Papers from Table of Contents or Articles in PressH. K. Gibbs ; L. Rausch ; J. Munger ; I. Schelly ; D. C. Morton ; P. Noojipady ; B. Soares-Filho ; P. Barreto ; L. Micol ; N. F. Walker
American Association for the Advancement of Science (AAAS)
Published 2015Staff ViewPublication Date: 2015-01-24Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Agriculture/*legislation & jurisprudence ; Brazil ; Conservation of Natural Resources/*legislation & jurisprudence ; *SoybeansPublished by: -
5Articles: DFG German National LicensesDouglas, A. A. ; Wager, J. F. ; Morton, D. C. ; Koh, J. B. ; Hogh, C. P.
[S.l.] : American Institute of Physics (AIP)
Published 1993Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Electrical and optical measurements of ZnS:Mn alternating-current thin-film electroluminescent (ACTFEL) devices grown by atomic layer epitaxy provide evidence for the existence of space charge within the bulk ZnS layer. Blue luminescence is observed during the falling edge of an applied voltage pulse when the ACTFEL device is operated at low temperature. This blue luminescence is attributed to donor-acceptor pair radiative recombination in which chlorine is identified as the donor and a zinc vacancy as the acceptor. This luminescence identification leads to determination of the origin of space charge as arising from impact ionization of the zinc vacancy.Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesDouglas, A. A. ; Wager, J. F. ; Morton, D. C. ; Koh, J. B. ; Hogh, C. P.
Woodbury, NY : American Institute of Physics (AIP)
Published 1993Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Hot electron luminescence experiments are performed on ZnS alternating-current thin-film electroluminescent (ACTFEL) devices in order to determine the extent to which the electron distribution is heated. The luminescence spectrum is found to be broad and essentially featureless up to a high energy cutoff of approximately 3.7 eV, which is determined by optical absorption within the ZnS. This result indicates that under normal operating conditions in a ZnS ACTFEL device, a significant fraction of the electrons transported across the phosphor possess energies equal to or in excess of the ZnS band gap.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesMorton, D. C. ; Koh, J. ; Hogh, C. P. ; Khormaei, R.
Woodbury, NY : American Institute of Physics (AIP)
Published 1993Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: A study of the relaxation luminance peak and the electro-optical aging effects in atomic layer epitaxy (ALE) normally doped ZnS:Mn alternating-current thin-film electroluminescent (ACTFEL) devices is presented. The relaxation luminance occurs when the applied voltage goes to zero. The changes in the luminance versus time L(t), current versus time I(t), and characteristics of luminance versus voltage, as a function of aging are discussed in terms of a model which includes bulk traps, space charge, and shallow trap levels. This relaxation luminance peak observed in ALE devices provides a means of gaining insight into ACTFEL devices.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesLite, K. ; Thuemler, R. L. ; Plant, T. K. ; Wager, J. F. ; Morton, D. C. ; Sun, S. S. ; Mauch, R. H.
Woodbury, NY : American Institute of Physics (AIP)
Published 1996Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Vacuum ultraviolet reflectivity measurements of three thin-film electroluminescent phosphors, zinc sulfide (ZnS), strontium sulfide (SrS), and strontium-calcium thiogallate (Sr0.45Ca0.55Ga2S4), are reported using thin-film samples. Measured ZnS reflectivity peak positions are in agreement with values previously reported in the literature. SrS room temperature reflectivity measurements are found to be consistent with previously reported low temperature measurements. Reflectivity measurements of Sr0.45Ca0.55Ga2S4 are reported for the first time; the reflectivity spectrum is found to rise monotonically above the band gap and to exhibit almost no structure, except for a small shoulder at ∼6.8 eV and a single, broad peak at ∼8.5 eV. The unusual nature of the Sr0.45Ca0.55Ga2S4 reflectivity spectrum is attributed to positional disorder in the stoichiometric thiogallate film. © 1996 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesChoe, Jae Young ; Ravichandran, D. ; Blomquist, S. M. ; Morton, D. C. ; Kirchner, K. W. ; Ervin, M. H. ; Lee, Unchul
Woodbury, NY : American Institute of Physics (AIP)
Published 2001Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Thin-film Y3−xAl5O12:Tbx3+ (YAG:Tb) phosphor derived from a sol-gel chemistry is analyzed by x-ray diffraction, scanning electron microscopy, photoluminescence (PL) and cathodoluminescence (CL). The metal alkoxides organic precursors were chosen as the starting materials to form the sol-gel. This liquid sol-gel was spin coated on sapphire and silicon substrates to form the uniform thin films, then crystallized by annealing. The PL intensity of the crystallized film at 545 nm green emission was 15 times higher than that of the as-coated noncrystalline film. CL measurements show that luminance and efficiency are comparable to the films deposited by other techniques. © 2001 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: SrS:Cu thin films were evaluated using thermally stimulated luminescence (TSL), photoluminescence (PL), electroluminescence (EL), and charge transfer over a temperature range of 10–850 K. The trap states were measured with and without a BaTa2O6 (BTO) overlayer film. From TSL results, the trap state energies were measured in the range of 0.4 eV, with differences due the BTO overlayer. From the PL, EL, and charge transfer measurements, the light emission and charge transfer decrease at a temperature consistent with the 0.4 eV trap level, demonstrating the importance of the trap states to EL devices. © 2001 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesDupree, A. K. ; Davis, R. J. ; Gursky, H. ; Hartmann, L. W. ; Raymond, J. C. ; Boggess, A. ; Holm, A. ; Kondo, Y. ; Wu, C.-C. ; Macchetto, F. ; Sandford, M. C. W. ; Willis, A. J. ; Wilson, R. ; Ciatti, F. ; Hatchings, J. B. ; Johnson, H. M. ; Jugaku, J. ; Morton, D. C. ; Treves, A. ; van den Heuvel, E. P. J.
[s.l.] : Nature Publishing Group
Published 1978Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] BINARY X-ray sources containing a compact object represent a class of stars that generally have been inaccessible to UV spectroscopic observations due to their faintness. Studies of these objects can potentially discern the physical conditions and dynamics of the material in the sources themselves ...Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The field of this group of QSOs (denoted a, b, c and d) is shown in Fig. 1. The fifth object (e) is the radio QSO 1146 + 111 which has a redshift z =0.86 (rf. 1); it shows no obvious emission features and from the objective prism data alone would have been considered only as a possible QSO ...Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 1433-075XKeywords: Key words ZnS:Mn ; ITO ; Photoluminescence (PL) ; Cathodoluminescence (CL) ; Rapid thermal annealing (RTA) ; Low voltage ; Phosphors ; Thin-films ; Atomic layer epitaxy (ALE) ; Electroluminescence (EL)Source: Springer Online Journal Archives 1860-2000Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision MechanicsNotes: Abstract ZnS:Mn thin films were coated on transparent conducting layer indium tin oxide (ITO) 2×2 in. glass substrates by an atomic layer epitaxy process. Grazing-angle X-ray diffraction on thin films shows a phase-pure ZnS with a wurtzite structure oriented along the 002 direction. Photoluminescence and CL measurements were carried out on the films. The emission from ZnS:Mn thin films consists of two strong bands at 515 and 452 nm with an excitation band at 329 nm. For improved brightness, the samples were annealed in a rapid thermal annealing furnace under different gas atmospheres (N2, O2 and forming gas) so that the green emission was increased. The green emission is due to donar-acceptor combination. Promising results were obtained when the thin films were annealed in forming gas at 600°C for one minute. Scanning electron microscope micrographs showed that the particles are well crystallized, with a grain size of 0.3–0.5 µm. This paper reports the particle size and morphology on the luminescent characteristics of a Mn2+ center in ZnS thin films.Type of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesHazard, C. ; Terlevich, R. ; Morton, D. C. ; Sargent, W. L. W. ; Ferland, G.
[s.l.] : Nature Publishing Group
Published 1980Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] The central star is located at 08 h 44min 03.55s, + 1803'48.2" (1950.0) and there is a 17.0 mag companion5 at 5.3" and PA 142. The compact nebulosities were discovered using a combination of a triple exposure three colour plate taken with the Palomar 48-inch Schmidt and a pair of objective prism ...Type of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesStaff View
ISSN: 1573-0638Source: Springer Online Journal Archives 1860-2000Topics: EducationType of Medium: Electronic ResourceURL:
