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  • 11
    Electronic Resource
    Electronic Resource
    A pyrophosphatase from mammalian tissues specific for derivatives of ADP
    Amsterdam : Elsevier
    BBA - Enzymology 167 (1968), S. 199-201 
    Details
    ISSN: 0005-2744
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2744(68)90294-5
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  • 12
    Electronic Resource
    Electronic Resource
    Formation of retinol [α,β-^3^2P]pyrophosphate with [γ-^3^2P]ATP catalysed by whole homogenates of rat thyroid
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 54 (1973), S. 76-81 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0006-291X(73)90890-5
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  • 13
    Electronic Resource
    Electronic Resource
    Culture of the American oyster, Crassostrea virginica (Gmelin 1971) in Rio Lagartos, Yucatán, México (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 28 (1997), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: This research was done with the purpose to ascertain the biological feasibility of the culture of Crassostrea virginica (Gmelin 1971) at Rio Lagartos lagoon in Yucatán, México. Spat from two localities of the Golfo de México were grown in Nestier boxes: spat from Tamiahua, Veracruz, which had an initial average height of 22.50 ± 5.10 (SD) mm and initial total wet weight of 2.90 ± 1.64 g and spat from Mecoacán, Tabasco, that were 32.05 ± 4.50 mm and 5.53 ± 0.03 g, respectively. Both groups of oysters reached commercial size after 10 months of culture. Veracruz spat reached 65.00 ± 6.80 mm in height and 33.26 ± 7.02 g in total wet weight. Those from Tabasco reached 62.90 ± 6.70 mm in height and 33.97 ± 9.95 g in total wet weight. The mean physiological condition index for oysters from Tabasco was 5.96% and from Veracruz was 4.52%. Total survival rate was 63% for spat from Veracruz and 55% from Tabasco. Environmental conditions in the culture area proved to be favourable for the rearing of C. virginica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2109.1997.00902.x
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  • 14
    Electronic Resource
    Electronic Resource
    X-ray diagnostic systems for the TJ–II flexible heliac : 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. 642-644 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The set of diagnostics that are being installed in TJ–II are meant to cover the full photon energy range expected in TJ–II during the electron cyclotron resonance heating phase. The obtained information will be used to evaluate the energy contained in the superthermal electron populations and its possible relevance in the global power balance as well as for standard electron temperature estimations. Two NaI(Tl) detectors located at the equatorial plane of the machine will be used to analyze the highest energy photons (over 50 keV). One Si(Li) and a planar Ge detector will be used to obtain the emission spectra between 1 and 100 keV. Tomographic reconstruction of plasma emissivity (up to 10 keV) will be carried out using four p-n silicon photodiodes arrays of 16 detectors, located at the same poloidal section. An additional camera will be used to detect toroidal asymmetries. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149517
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  • 15
    Electronic Resource
    Electronic Resource
    Bolometry systems for the TJ-II flexible heliac : 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. 384-386 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Local plasma emissivity of TJ-II plasmas will be determined using pyroelectric detectors. For tomographic reconstructions three fan-like arrays, 20 channels each, will be installed at the top, side, and bottom ports of the same sector. The designed compact in-vessel systems will use folding support structures to introduce the arrays through small diameter flanges and translation and rotary drives to position them at their measuring sites. Special individual "honeycomb-like" collimators (transparency of around 50% and spatial resolution of about 2 cm at the plasma center) have been designed to optimize the signal level and to act as a microwave filter. In the first stage, radial profiles of plasma emissivity will be obtained with a single detector, on the basis of frozen plasma parameters during a few ms. This detector is equipped with a rotary slit that scans the whole plasma cross section from 10–20 times per shot. To perform power balances, global plasma emission is monitored with three pyroelectric detectors. Collimators are movable slits that enable probing either the full plasma cross section or narrow central chords; when fully closed they protect detectors during wall conditioning and permit background noise characterization. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149327
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  • 16
    Electronic Resource
    Electronic Resource
    Space-flight digital signal processor system for on-board processing of experiment data (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3751-3754 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a digital signal processor (DSP) system to extend the capabilities of a variety of scientific instruments used to make in situ ionospheric plasma measurements from sounding rockets and spacecraft. The DSP system is extremely flexible due to the use of a field programmable gate array, sigma-delta analog-to-digital converters, and a highly integrated single-chip DSP. Using virtually identical circuitry, we have operated DSP systems processing data from low-frequency electric field detectors, Langmuir probes, and several radio-frequency receivers on several sounding rockets and spacecraft with different digital telemetry interfaces. The DSP system provides three major improvements to our instruments: (1) reduced telemetry bandwidth (data) requirements, (2) improved signal-to-noise ratio, and (3) digital antialiasing filtering. We describe our DSP system and show three examples of how we have implemented it with our instruments. Similar systems should be of interest to researchers in many fields of research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147143
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  • 17
    Electronic Resource
    Electronic Resource
    Rocket-borne downconverter system for measuring space plasma turbulence (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1056-1060 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: For research into space plasma turbulence, we have developed a number of space-flight instruments for making in situ measurements of plasma wave activity. One of these instruments, the NRL downconverter, is used to measure plasma waves in the 2- to 20-MHz frequency range by downconverting a 100-kHz band of frequencies to the baseband. Input frequency tuning is controlled by an imbedded microcomputer, and can be programmed to scan in any desired frequency pattern. The in-phase and quadrature receiver outputs, each having a 50-kHz bandwidth, are processed externally by digital signal processors (DSP). The receiver achieves 35 dB of sideband rejection using a hybrid quadrature mixer design, which incorporates an analog front end with digital signal processing. This design yields 15 dB of improved sideband rejection over more conventional analog techniques. The microcomputer control, DSP processing, and modular design contribute to the flexibility of the receiver, which has allowed the system to be used on a number of different missions. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146045
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  • 18
    Electronic Resource
    Electronic Resource
    Shallow buried SiNx layers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 8201-8203 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High dose nitrogen implantations have been performed at an energy of 30 keV. After high temperature annealing, 1200 °C, a buried layer composed mostly of silicon nitride is formed leaving an overlayer with a high fraction of crystalline silicon. The lattice constant of the overlayer and the region below the SiNx are reduced in 0.13% and 0.089%, respectively. The substitutional N seems to be responsible for this reduction. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373520
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  • 19
    Electronic Resource
    Electronic Resource
    Cathodoluminescence from BN buried layers by high-dose ion implantation (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 6209-6211 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Boron, nitrogen, and carbon ions were co-implanted in silicon wafers, and subsequently annealed. Infrared spectra show the formation of BN-rich buried layers. The presence of a band at 1375 cm−1 characteristic of boron nitride in a hexagonal configuration has been observed. Traces of the cubic phase formation were detected in some cases. Implanted samples exhibit a broad emission band about 550 nm. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1462840
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  • 20
    Electronic Resource
    Electronic Resource
    New species of the genus Trichodrilus (Oligochaeta, Lumbriculidae)
    Amsterdam : Elsevier
    Zoologica Scripta 23 (1994), S. 33-41 
    Details
    ISSN: 0300-3256
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0300-3256(94)90020-5
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