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  • 1
    Electronic Resource
    Electronic Resource
    Serrated Plastic Flow Revisited (1995)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 42-43 (Apr. 1995), p. 257-266 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/25/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.42-43.257.pdf
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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    MEASUREMENT OF STRETCH ZONE HEIGHT AND ITS RELATIONSHIP TO CRACK TIP OPENING DISPLACEMENT AND INITIATION J-VALUE IN AN AISI 316 STAINLESS STEEL (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 19 (1996), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: An accurate method using SEM for the measurement of stretch zone height (SZH) on fracture surfaces has been established. This method does not make any assumption regarding crack blunting angle θ, and for 316 stainless steel in the present investigation θ was in the range of 50 to 67°, contrary to the common assumption of 45°. The semi-empirical equations, SZH(T) = 2.5 SZW (stretch zone width) and SZW = 89(J/E), reported in the literature were found to give very conservative predictions of initiation toughness Ji for an AISI 316 stainless steel. Lowerbound values of the coefficient m in the equation, J = mσyδ, relating J to CTOD, δ, is found to be 1.5–1.7 for the 316 SS used in this investigation; the upperbound value for m is found to be 2.6. The plastic CTOD values (δmax) corresponding to the maximum load-point on the instrumented impact test traces are not sensitive to the aging conditions and as they incorporate significant crack growth effects they cannot be used for predicting Ji, by a procedure similar to that discussed above. The ratio t1/tT, where ti is the time to crack initiation and ti is the time to total fracture, in precracked Charpy tests of unaged and aged 316 SS used in this investigation (a/W=0.55 to 0.8) corresponds to 0.15 to 0.17.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1996.tb01021.x
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  • 8
    Electronic Resource
    Electronic Resource
    Aluminum-Induced Osteogenesis in Osteopenic Rats with Normal Renal Function (1999)
    Springer
    Calcified tissue international 64 (1999), S. 534-541 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Aluminum — Osteogenesis — Osteopenic rats — Bone formation — Bone mass — Biochemical markers.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Previous studies have shown a different effect of aluminum (Al) on bone metabolism in animals with chronic renal failure and conversely, positive osteogenic effects in animals with normal renal function. The aim of this study was to evaluate the effect of aluminum on bone metabolism in osteopenic rats. We studied male Wistar rats with severe osteopenia induced by adding NH4Cl (2%) to the drinking water over a 6-month period. The rats were divided into two groups and followed for 4 months. The Aluminum group (G1) received AlC13 intraperitoneally (10 mg/kg/5 days/week) (n = 8); the Control group (G2) did not receive any treatment after stopping the administration of NH4Cl (n = 5). In all animals we measured biochemical markers (serum Ca, P, Cr, Al, osteocalcin, hydroxyproline) as well as bone mineral density and bone histomorphometry (BV/TV, CTh, ObS/BS, OTh, and NOc/TV). Bone aluminum content, measured by atomic absorption spectrometry, was 101.6 ± 13 μg/g in the Al overloaded group and 1.31 ± 0.14 in controls. Bone mineral density, evaluated by dual X-ray absorptiometry (DXA) at the proximal extremity of the tibia was significantly higher in G1 (0.292 ± 0.01 g/cm2 versus 0.267 ± 0.02 g/cm2). No significant differences were found between the biochemical markers. In the histomorphometric parameters we observed significant differences in G1 compared with G2: an increase in BV/TV (18.59 ± 5.6 versus 7.69 ± 3.08%) and in CTh (0.52 ± 0.06 versus 0.36 ± 0.07 mm) with a moderate increment of the osteoid thickness (14.05 ± 4.72 versus 5.25 ± 0.9 μm) (P 〈 0.05). Changes in others parameters and the relationship between biochemical parameters of bone remodeling, Al, and histology were analyzed. These findings indicate that in rats with normal renal function, Al is able to induce bone formation even when osteopenia is present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900645
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  • 9
    Electronic Resource
    Electronic Resource
    Riesz's Theorem for Orthogonal Matrix Polynomials (1999)
    Springer
    Constructive approximation 15 (1999), S. 135-151 
    Details
    ISSN: 1432-0940
    Keywords: Key words. Orthogonal matrix polynomials, Matrix moment problem. AMS Classification. 42C05, 44A60.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. We describe the image through the Stieltjes transform of the set of solutions V of a matrix moment problem. We extend Riesz's theorem to the matrix setting, proving that those matrices of measures of V for which the matrix polynomials are dense in the corresponding $ {\cal L} $ 2 space are precisely those whose Stieltjes transform is an extremal point (in the sense of convexity) of the image set.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003659900101
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  • 10
    Electronic Resource
    Electronic Resource
    Local field correction PIV: on the increase of accuracy of digital PIV systems (1999)
    Springer
    Experiments in fluids 27 (1999), S. 107-116 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Cross-correlation Particle Image Velocimetry (PIV) has become a well known and widely used experimental technique. It has been already documented that difficulties arise resolving velocity structures smaller than the interrogation window. This is caused by signal averaging over this window. A new cross-correlation PIV method that eliminates this restriction is presented. The new method brings some other enhancements, such as the ability to deal with large velocity gradients, seeding density inhomogeneities, and high dispersion in the brightness of the particles. The final result is a method with a remarkable capability for accurately resolving small scale structures in the flow, down to a few times the mean distance between particles. When compared to particle tracking velocimetry, the new method is capable of obtaining measurements at high seeding density concentrations. Therefore, better overall performance is obtained, especially with the limited resolutions of video CCDs. In this paper, the new method is described and its performance is evaluated and compared to traditional PIV systems using synthetic images. Application to real PIV data are included and the results discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003480050335
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