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  • 1
    facet.materialart.
    Unknown
    Charcoal records of two sediment cores off SW Africa (2012)
    PANGAEA
    In:  Supplement to: Daniau, Anne-Laure; Bartlein, Patrick J; Harrison, S P; Prentice, Iain Colin; Brewer, Simon; Friedlingstein, Pierre; Harrison-Prentice, T I; Inoue, J; Izumi, K; Marlon, Jennifer R; Mooney, Scott D; Power, Mitchell J; Stevenson, J; Tinner, Willy; Andric, M; Atanassova, J; Behling, Hermann; Black, M; Blarquez, O; Brown, K J; Carcaillet, C; Colhoun, Eric A; Colombaroli, Daniele; Davis, Basil A S; D'Costa, D; Dodson, John; Dupont, Lydie M; Eshetu, Z; Gavin, D G; Genries, A; Haberle, Simon G; Hallett, D J; Hope, Geoffrey; Horn, S P; Kassa, T G; Katamura, F; Kennedy, L M; Kershaw, A Peter; Krivonogov, S; Long, C; Magri, Donatella; Marinova, E; McKenzie, G Merna; Moreno, P I; Moss, Patrick T; Neumann, F H; Norstrom, E; Paitre, C; Rius, D; Roberts, Neil; Robinson, G S; Sasaki, N; Scott, Louis; Takahara, H; Terwilliger, V; Thevenon, Florian; Turner, R; Valsecchi, V G; Vannière, Boris; Walsh, M; Williams, N; Zhang, Yancheng (2012): Predictability of biomass burning in response to climate changes. Global Biogeochemical Cycles, 26(4), https://doi.org/10.1029/2011GB004249
    Details
    Publication Date: 2024-05-27
    Description: We analyze sedimentary charcoal records to show that the changes in fire regime over the past 21,000 yrs are predictable from changes in regional climates. Analyses of paleo- fire data show that fire increases monotonically with changes in temperature and peaks at intermediate moisture levels, and that temperature is quantitatively the most important driver of changes in biomass burning over the past 21,000 yrs. Given that a similar relationship between climate drivers and fire emerges from analyses of the interannual variability in biomass burning shown by remote-sensing observations of month-by-month burnt area between 1996 and 2008, our results signal a serious cause for concern in the face of continuing global warming.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 2
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    Research and development of high-precision accelerometer for future satellite navigation system (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-06-05
    Description: In precise orbit determination (POD) for GNSS satellites, the solar radiation pressure (SRP) that is the largest non-gravitational acceleration is a major error source. Usually, we correct SRP by using the empirical model in POD, but it is not enough. The Japan Aerospace Exploration Agency (JAXA) has been proceeding the research and development of the high-precision accelerometer that can be mounted on a satellite and measure non-gravitational acceleration directly to use acceleration data for POD. For Quasi-Zenith Satellite System satellites, the maximum acceleration caused by SRP is about 10〈sup〉-7〈/sup〉m/s〈sup〉2〈/sup〉, and the accuracy of JAXA's SRP model is order of 10〈sup〉-9〈/sup〉m/s〈sup〉2〈/sup〉. To improve the correction accuracy of non-gravitational acceleration, we need to the accelerometer which has a measurement resolution of 10〈sup〉-10〈/sup〉m/s〈sup〉2〈/sup〉 or less. Our goal is to improve the accuracy of non-gravitational force model by an order of magnitude. Therefore, we have been making the prototype of accelerometer that consist of the interferometric sensor, test mass, and actuator. In particular, we adopted the quadrature laser interferometer which has the advantage of both high sensitivity and wide measurement range for the interferometric sensor. Last two years, we have made the interferometric sensor and a part of the test mass and have evaluated their performance. Currently, we have been making multiple breadboard models (BBMs) of the accelerometer. By simultaneously measuring by multiple BBMs, we are planning to eliminate common-mode noise such as ground motions and evaluate their performance. In this presentation, we explain overview and status of this R&D.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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    PAPER (OA)
  • 3
    Electronic Resource
    Electronic Resource
    Infrared spectroscopy of hydrides on the 6H-SiC surface (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 3072-3074 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hydrides on the 6H-SiC(0001¯) and (0001) surfaces before and after hydrogen annealing were investigated by infrared attenuated total reflection spectroscopy. The absorption bands of CH2 and CH3 were observed from the 6H-SiC(0001¯) and (0001) surfaces before hydrogen annealing. After hydrogen annealing, a sharp C–H stretching vibration attributable to a monohydride appeared on the 6H-SiC(0001¯) surface, in contrast to a sharp Si–H stretching vibration which can be observed on the 6H-SiC(0001) surface. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119094
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  • 4
    Electronic Resource
    Electronic Resource
    Infrared attenuated total reflection spectroscopy of 6H–SiC(0001) and (0001¯) surfaces (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 3569-3575 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fourier-transformed infrared attenuated total reflection (FTIR–ATR) spectroscopy was used to study the adsorbates on 6H–SiC(0001) and (0001¯) surfaces after chemical treatments and after heat treatments in hydrogen. We obtained clear absorption bands attributable to hydrides and oxides on the SiC surfaces. The ATR spectroscopy revealed polarity dependencies of Si–H and C–H stretch modes between the 6H–SiC(0001) and (0001¯). The surface Si–H bonds on 6H–SiC(0001) formed by the heat treatment in hydrogen were found to have a quite long life time against air exposure, and the heat treatment in hydrogen also produced a flat (0001¯) surface with ordered surface C–H bonds. The oxidation characteristics of 6H–SiC(0001) and (0001¯) surfaces were also studied, and we discussed the roles of surface treatments using H2O2 solution and H2SO4 solution at elevated temperature. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369716
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  • 5
    Electronic Resource
    Electronic Resource
    Fabrication of 57Fe/Fe multilayers (abstract) : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2126-2126 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Synchrotron radiation can furnish Mössbauer radiation sources with higher brightness compared with conventional radioactive γ-ray sources when nuclear resonant Bragg scattering of synchrotron radiation is utilized. So far the observation of nuclear resonant Bragg scattering has been successfully carried out using single crystals containing 57Fe isotope at INP, HASYLAB, and BNL. We intend to use 57Fe/Fe multilayers instead of the crystals as a nuclear scatterer. In order to observe nuclear resonant scattering it is necessary to suppress Thomson electronic scattering which makes a huge background noise. In the case of the multilayer containing 57Fe and 56Fe only, nuclear resonant Bragg scattering can be observed in the absence of electronic Bragg scattering. Computation of the reflected intensities from a multilayer was made by the method analogous to that used in the design of a multilayer interference filter for a visible ray. Multilayers were fabricated by depositing alternate layers of 57Fe and 56Fe with designed layer thicknesses of 8 and 12 A(ring), respectively. As substrates, quartz glass plates and quartz crystal plates were used. The substrates were cooled by liquid nitrogen. The structure of the multilayer was characterized by Mössbauer γ-ray diffraction. The 14.4-keV γ-rays from 57Co source were used. A rocking curve has a peak, when measured under the resonance condition. The Bragg angle of the peak coincide well with that calculated from the designed spacings. From these facts it is concluded that the peak corresponds to nuclear resonant Bragg scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140843
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  • 6
    Electronic Resource
    Electronic Resource
    ISOMETRIC TENSION DEVELOPMENT OF GLYCERINATED FIBERS PREPARED FROM NORMAL AND PSE PORCINE MUSCLES AND THE EFFECT OF MYOSIN IRRIGATION ON THE TENSION DEVELOPMENT OF “GHOST” FIBERS (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 42 (1977), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Isometric tension development of glycerinated single fibers prepared from normal and PSE porcine muscles upon addition of Mg2+-ATP was estimated. The study was also made on the myosin-irrigated fibers prepared by irrigating porcine myosins into rabbit “ghost” fibers. The isometric tension of the fibers was decreased as the pH of the muscle was decreased. The tension development of normal myosin-irrigated fiber was 60% higher than that of the “ghost” fiber, while that of PSE myosin-irrigated fiber was diminished to zero. From the evidences obtained in the present and in the previous studies, we have tentatively concluded that lack of contractility of PSE muscle is mostly due to the irreversible binding of myosin to actin filaments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1977.tb01232.x
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  • 7
    Electronic Resource
    Electronic Resource
    Reaction of Nitrite and Cytochrome c in the Presence or Absence of Ascorbate (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 47 (1982), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The reaction of nitrite with cytochrome c in the presence or absence of sodium ascorbate was studied. The amount of ferrocytochrome c nitrosyl compound I (cytochrome c · Fe2+-NO+) formed in the absence of ascorbate was dependent on pH both at initial equal concentrations of nitrite or nitrous acid; the amount formed was very small at pH above 5.0. The presence of ascorbate significantly enhanced the extent of the reaction in the pH range 5.0–6.0. The reaction decreased rapidly at pH above 6.0, but application of heat was effective in giving a large formation of the product. Ascorbate reduced compound I to ferrocytochrome c nitrosyl compound II (cytochrome c · Fe2+-NO). The relative amounts of the two compounds formed was influenced by pH; at pH below 3.6, a mixture of compound I and II was formed, but only compound II was formed above pH 3.6. Compound II easily gave rise to ferrocytochrome c Cytochrome c probably reacts with nitrite in cured meat if ascorbate or erythorbate is used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1982.tb04952.x
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  • 8
    Electronic Resource
    Electronic Resource
    Reaction of nitrite with ascorbic acid and its significant role in nitrite-cured food
    Amsterdam : Elsevier
    Meat Science 26 (1989), S. 141-153 
    Details
    ISSN: 0309-1740
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0309-1740(89)90037-5
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of ATP concentration and pH on rigor tension development and dissociation of rigor complex in glycerinated rabbit psoas muscle fiber
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/General Subjects 678 (1981), S. 364-372 
    Details
    ISSN: 0304-4165
    Keywords: (Rabbit psoas muscle) ; ATP concentration ; Rigor complex dissociation ; Rigor tension ; pH effect
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-4165(81)90116-1
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  • 10
    Electronic Resource
    Electronic Resource
    Roles of three lumen-surface proteins in the formation of S"2 state and O"2 evolution in Photosystem II particles from spinach thylakoid membranes
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Bioenergetics 848 (1986), S. 201-211 
    Details
    ISSN: 0005-2728
    Keywords: (Spinach chloroplast, Reconstitution) ; ESR ; Oxygen evolution ; Photosystem II ; Water-splitting complex
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2728(86)90042-3
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