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  • 1
    Digitale Medien
    Digitale Medien
    Electronic structure of second harmonic generation crystal Li3VO4 (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3668-3673 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The origin of second harmonic generation (SHG) of Li3VO4 was investigated from the viewpoint of the band structure by using the tight-binding method. The tight-binding parameters were optimized to reproduce the density of states (DOS) obtained from x ray photoelectron spectroscopy and the optical band gap. Although Li3PO4 has the same crystal structure as Li3VO4, it shows no SHG. To explain the difference in optical nonlinearity we compared the electronic structures of Li3VO4 and Li3PO4, in particular at the bottom of conduction band (CB) and the top of valence band (VB), since they are known to play a primary role in SHG. In Li3PO4, the bottom of CB consists of P 3s and O 2p orbitals and the top of VB is composed of O 2p orbitals. These electronic structures result in a relatively low DOS at the bottom of CB and a wide band gap in Li3PO4. On the other hand, in Li3VO4, both bottom of CB and top of VB are composed of V 3d and O 2p. The preferential contribution of V 3d orbitals to the band edge states leads to a high DOS at the bottom of CB, a narrow band gap and delocalization of electrons on V–O bonds. We conclude that these electronic structures are responsible for the high optical-nonlinearity of Li3VO4. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363314
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  • 2
    Digitale Medien
    Digitale Medien
    Point defects in irradiated Li3VO4 single crystal (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2339-2342 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Radiation-induced defects in a new second harmonic generation material, lithium vanadate single crystal, have been studied by electron paramagnetic resonance (EPR) and optical absorption measurements. EPR detects two intense signals due to intrinsic O− and impurity-associated CO−3 trapped-hole centers at 77 K, but no such signal in the case of trapped-electron centers. The EPR signal of impurity Fe3+ ions is suppressed by 77 K irradiation. Low-temperature irradiation produces three optical absorption bands peaking at 3.14, 2.0, and 1.56 eV. It has been concluded that some of the free electrons produced by irradiation are trapped by Fe3+ ions at low temperatures. After annealing at room temperature all the optical absorption bands disappear, although the EPR signals of CO−3 trapped-hole centers and unidentified electron-type centers at g=1.96 remain stable up to 330 K. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.359541
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  • 3
    Digitale Medien
    Digitale Medien
    Mass data acquisition systems in JT-60 data processing system : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 517-519 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: In the data processing system for the JT-60 tokamak, a unique mass data acquisition system with fast sampling, a transient mass data storage system (TMDS), has been used since 1988. It is composed of a minicomputer and 61 channels of 4/6 MB memory modules with a sampling rate up to 200 kHz and about 300 MB of data are transferred to a main computer by using a special LAN developed by Fujitsu Ltd. TMDS can handle a large amount of data, but cannot be enlarged in its capability, such as CPU power or the number of channels. To solve the problems of TMDS, a new fast VME data acquisition system (FDS), has been developed. It can acquire 6 MB of data per channel with a sampling rate of 200 kHz or 1 MHz and consists of a workstation with VMEbus memory modules. Up to now there are three FDSs with 24 channels. The minicomputer of TMDS has been replaced with a new system based on the technology of FDS. To cope with mass data transfer to a data server, they are connected with a gigabit ethernet switch. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1319866
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  • 4
    Digitale Medien
    Digitale Medien
    Systems for remote participation in JT-60 experiments : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 502-504 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Since 1996, the remote participation in JT-60 experiments has been successfully conducted in collaboration with JAERI, Los Alamos National Laboratory and Princeton Plasma Physics Laboratory. The remote analysis system is a computer complex consisting of an analysis server and a data server for access to JT-60 data. Collaborators of the remote participation can analyze JT-60 data by using this system through the Internet. For the remote diagnostic system, an X Window control program has been customized to communicate via the overseas line using a UNIX workstation at the remote site and one in the JT-60 control room. It has a feature of real-time remote control of diagnostic equipment and remote access to CAMAC data. Both systems are used together with the ISDN-based video-conferencing system for real-time communication between the remote laboratory and the JT-60 control room. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1149270
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  • 5
    Digitale Medien
    Digitale Medien
    Deracemization via Highly Enantioselective Enolate Protonation Using a Chiral Aniline as the "Acid" (1994)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 2175-2176 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00084a080
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  • 6
    Digitale Medien
    Digitale Medien
    Product yield-detected ESR on magnetic field-dependent photoreduction of quinones in SDS micellar solution (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 6792-6800 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Transient free radicals in the magnetic field-dependent photoreduction of quinones (menadione or anthraquinone) in a sodium dodecyl sulfate (SDS) micellar solution, were converted to stable nitroxide radicals by the "spin trapping'' technique with or without the microwave irradiation. Upon irradiating the microwave at 160 mW, the product yield ("spin adduct'' of the alkyl radical generated from SDS molecule) decreased by up to 14% at certain magnetic fields in a resonant manner. Although only one component of the postulated radical pair was converted to the spin adduct, the decrease in the yield as a function of external magnetic field revealed the ESR spectra of both component radicals of the radical pair, i.e., the semiquinone radical and the alkyl radical from SDS. This experiment not only gives the direct evidence for the radical pair model, but also suggests the possibility for this method to be applied in controlling the chemical reactions by the microwave. A simple calculation was made to simulate the observed "product yield-detected ESR.'' Agreements were achieved semiquantitatively between the observed reductions in the spin adduct yields and those calculated. The estimated exchange interaction between the component radicals in the radical pair of the present systems was lower than 0.3 mT.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.452378
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  • 7
    Digitale Medien
    Digitale Medien
    CEREBROSIDE IN RICE GRAIN (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 39 (1974), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Cerebroside (hexosylceramide) was isolated from rice grain, identified and examined for composition of fatty acid, sugar and long-chain base constituents. The cerebroside was observed to contain 12 fatty acids; hydroxyarachidic (59.0%), hydroxylignoceric (19.7%) and hydroxybehenic (10.3%) acids were predominant. Glucose was the only sugar constituent. Three component long-chain bases were found: two were identified as sphingosine (72.9%) and dehydrophytosphin-gosine (17.3%). It is thus suggested that the major species of rice grain cerebroside is N-hydroxyarachidyl-glucosyl-sphingosine.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1974.tb02927.x
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  • 8
    Digitale Medien
    Digitale Medien
    GENETIC CONTROL OF THE IMMUNE RESPONSE TO HEN'S EGG-WHITE LYSOZYME IN MICE: I. ANTIBODY AND T-LYMPHOCYTE PROLIFERATIVE RESPONSES TO THE NATIVE PROTEIN (1979)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 6 (1979), S. 0 
    Details
    ISSN: 1744-313X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Medizin
    Notizen: We have initiated studies to determine whether the antibody and T-lymphocyte proliferative responses to lysozyme and its antigenic sites is genetically controlled in mice. Mice of the H-2f, H-2k and H-2p were high responders, while haplotypes H-2b, H-2d, H-2r and H-2s were low responders. Studies with recombinants indicated that the immune response is controlled by two H-2I region loci, one being in the I-A subregion and the other may be in the I-C subregions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1744-313X.1979.tb00699.x
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  • 9
    Digitale Medien
    Digitale Medien
    The Muscles of Mastication in the Caspian Seal (Phoca caspica) (2002)
    Berlin, Germany : Blackwell Verlag GmbH
    Anatomia, histologia, embryologia 31 (2002), S. 0 
    Details
    ISSN: 1439-0264
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The muscles of mastication and their related skull characters in the Caspian seal (Phoca caspica) were anatomically examined and compared with those of the Baikal (Phoca sibirica) and ringed (Phoca hispida) seals. A well-developed masseter muscle was observed in the Caspian seal, whereas the temporal muscle consisted of thin bundles. The skull of the Caspian seal possessed the same thin frontal bone and the dorso-ventrally developed zygomatic arch found in the Baikal seal that are required to install the enlarged eyeball into the orbit. The temporal bone was not robust, and the digastric muscle was well-developed in the ventral space of the auditory bulla. The present results suggest that the skull form of the Caspian seal has changed morphologically from its ringed seal-like ancestors, and suggest that the evolutionary strategy of the muscles of mastication in the Caspian seal is principally consistent with that of the Baikal seal.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1439-0264.2002.00372.x
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  • 10
    Digitale Medien
    Digitale Medien
    EFFECT OF BLOOD FLOW AND HAEMATOCRIT ON THE RELATIONSHIP BETWEEN MUSCLE VENOUS Po2 AND OXYGEN UPTAKE IN DOG MAXIMALLY CONTRACTING GASTROCNEMIUS IN SITU (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 24 (1997), S. 0 
    Details
    ISSN: 1440-1681
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: 1. To clarify the limiting factors for peak V̇o2 (V̇o2peak)〉 we measured muscle venous Po2 (Pvo2) and V̇o2, peak under various O2 delivery conditions (arterial O2 concentration X flow) via the alteration of blood flow and haematocrit (Hct) in anaesthetized dog gastrocnemius muscle (n= 11) stimulated by 1 Hz isometrically and tetanically.2. Two levels of flow (high and moderate) were maintained by using a pump (ISO and 100 mL/min per 100 g, respectively). Haematocrit was adjusted to 45 and 30% by isovolaemic haemodilution with dextran (MW 40 000).3. The decrease in Hct induced a 31% decrease in O2 delivery (P〈0.05), a 9–12% decrease in Pvo2, a 23% decrease in V̇o2, peak(P〈0.05) and a 12–14% increase in O2 extraction (V̇o2/O2delivery) at both flow levels. The decrease in flow induced a 24–25% decrease in O2 delivery (P〈0.05), a 15–17% decrease in Pvo2 (P〈0.05), a 9% decrease in V̇o2,peak (P〈0.05) and a 19–22% increase in O2 extraction (P〈0.05) at both Hct levels.4. The results suggest that the limiting factor of V̇o2peak, unrelated to O2 diffusion limitation (i.e. the change in the heterogeneity of V̇o2 to O2 delivery ratio among capillaries), due to lowering Hct may be different from that due to lowering blood flow in maximally contracting muscle.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1440-1681.1997.tb01805.x
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