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  • Springer  (102)
  • American Association for the Advancement of Science  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Back analysis of measured displacements of tunnels (1983)
    Springer
    Rock mechanics and rock engineering 16 (1983), S. 173-180 
    Details
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Summary The present paper deals with a method of back analysis to be utilized for the interpretation of field measurements in monitoring the stability of tunnels. The method belongs to an inverse approach based on the finite element formulation, assuming the ground media in which tunnels are excavated to be linear, isotropic and elastic. Assuming Poisson's ratio and the vertical initial stress, the method derives the complete initial state of stress and Young's modulus from a set of relative displacements measured between adjacent measuring points. In order to verify the applicability of the proposed method of back analysis to practical engineering problems, a case study is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01033278
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  • 2
    Electronic Resource
    Electronic Resource
    Discrimination of genetic sex in embryos of d-rR strain of the medaka (Oryzias latipes) (1967)
    Springer
    Cellular and molecular life sciences 23 (1967), S. 569-570 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Die Körperfarbe des männlichen d-rR Medaka ist wegen des in Xanthophor enthaltenen Carotinoid-Pigments orange, die der weiblichen wegen seiner Abwesenheit uni. Die Färbung erfolgt im allgemeinen nach der Ausbrütung. Wird das rote Carotinoid des Paprikas unmittelbar nach der Befruchtung injiziert, so wird die dorsale Körperoberfläche des männlichen Embryos durch das Pigment gefärbt, was die Feststellung des erblichen Geschlechts schon vor der Ausbrütung erlaubt. Beurteilungsfehler konnten bis auf weniger als 10% herabgedrückt werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02137976
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  • 3
    Electronic Resource
    Electronic Resource
    The promoter function of molybdenum in Rh/Mo/SiO2 catalysts for CO hydrogenation (1994)
    Springer
    Catalysis letters 28 (1994), S. 329-336 
    Details
    ISSN: 1572-879X
    Keywords: rhodium ; molybdenum ; oxygenates ; hydrogenation ; CO adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of Rh/Mo/SiO2 catalysts with fixed Rh and different Mo contents were studied by FT-IR, chemisorption and CO hydrogenation. The FT-IR results at room temperature under CO atmosphere indicate that the addition of Mo to Rh/SiO2 suppresses the linear and bridged CO species and promotes the twin CO species, which is consistent with the chemisorption results. It is suggested that the Mo promoter works via stabilization of Rh1– ions and the coverage of Rh sites. The molybdenum promotes the formation of oxygenates and shifts the selectivity from hydrocarbons to oxygenates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806063
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  • 4
    Electronic Resource
    Electronic Resource
    CO2 laser isotope separation of tritium with (CF3)3CT (1987)
    Springer
    Applied physics 42 (1987), S. 167-172 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 82.40 ; 42.60.Kg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new working molecule 1,1,1,3,3,3-hexafluoro-2-(trifluoromethyl)-propane-2-t (CF3)3CT, is reported for the isotope separation of tritium by TEA CO2-laser-induced multiphoton dissociation (MPD). Selective and efficient dissociation of (CF3)3CT was observed by irradiation at about 980 cm−1 where (CF3)3CH was nearly transparent. The critical fluence for dissociation of (CF3)3CT at 10R(28) 980.9 cm−1 was estimated to be as low as 4.6 J/cm2, which is the lowest of the tritiated halocarbons that we have ever reported. A detailed study was made of the pressure dependence of the dissociation rate constants for (CF3)3CT and (CF3)3CH to clarify the collisional effects in their MPD. The hydrogen isotope exchange between (CF3)3CH and HTO was found to be extremely rapid, which is advantageous in the practical laser separation cycle for tritium removal from water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693880
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  • 5
    Electronic Resource
    Electronic Resource
    Cross section of supercooled238UF6 in multiphoton absorption induced by 16 micrometer Raman-laser radiation (1994)
    Springer
    Applied physics 59 (1994), S. 475-477 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 33.00
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of multiphoton absorption of 16 µm Raman-laser radiation in supercooled238UF6 at 90 K were performed by using a pulsed Laval nozzle with an optical path length of 50 cm. The laser fluence was varied between 50 and 500 mJ/cm2 for four frequencies in the range from 625 to 629 cm−1. The energy absorbed by238UF6 molecules was investigated as a function of laser frequency or fluence, and highly accurate results were obtained with the use of the nozzle whose optical path length is much greater than that of nozzles used before. The results indicated that the absorption cross section at the peak absorption frequency (627.8cm−1) was proportional to the −1/3 power of the fluence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081071
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  • 6
    Electronic Resource
    Electronic Resource
    Measurements of235U/238U isotopic ratio in the photoproduct UF5 by multiphoton ionization and time-of-flight mass spectrometry (1996)
    Springer
    Applied physics 62 (1996), S. 515-519 
    Details
    ISSN: 1432-0649
    Keywords: 07.75 ; 33.00 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A MultiPhoton-Ionization Time-Of-Flight Mass Spectrometry (MPI/TOFMS) apparatus was developed for real-time measurement of the uranium isotopic ratio in nascent UF5 formed by the 266 nm photolysis of effusive UF6 ( 〈 300 K, ≈ 1.3 × 10−4 Pa). The UF5 was selectively and efficiently multiphoton ionized by 532 nm radiation at appreciably low fluences ( 〈 10 J/cm2). The main ions observed, U+ and U2+, were subsequently analyzed with a TOFMS with mass resolution of 1190 to separate235U n+ and238U n+ completely. The isotopic ratio measurements showed good precision resulting from the excellent agreement which was observed between the isotopic ratios in UF5 products and those in a parent UF6 sample. These results suggested that the MPI/TOFMS method can be applied to the real-time analysis of separation factors in the molecular laser isotope separation of uranium by ionization of UF5 following the infrared photodissociation of UF6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081053
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  • 7
    Electronic Resource
    Electronic Resource
    Vibrational predissociation of UF6 clusters in supersonic Laval nozzle flow (1996)
    Springer
    Applied physics 63 (1996), S. 57-61 
    Details
    ISSN: 1432-0649
    Keywords: 33.00 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The time-dependent change in the concentration of UF6 monomers populated in the ground state was monitored in a supersonic Laval nozzle flow with an infrared diode-laser spectrometer in which the frequency of the laser beam was fixed at theυ = 1 ← 0 transition (627.7 cm−1) of theν 3 vibrational mode of the238UF6 monomer. The concentration of UF6 monomers in the ground state increased immediately after a single shot from a Raman laser tuned to a vibrational mode of UF6 clusters (614.8 cm−1) was applied to the gas in the nozzle. Subsequently, this concentration leveled off and slowly returned to the previous level. These results indicate that the population of UF6 monomers in the ground state increased as a result of the predissociation of UF6 clusters vibrationally excited with Raman laser radiation. It is demonstrated that one can utilize this procedure for vibrational predissociation of UF6 clusters as a technique to increase the concentration of UF6 monomers in an irradiation zone for molecular laser isotope separation of uranium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01112839
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  • 8
    Electronic Resource
    Electronic Resource
    Tritium isotope separation by CO2-laser irradiation at low temperatures (1984)
    Springer
    Applied physics 33 (1984), S. 83-90 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 82.40 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Tritium isotope separation by CO2-laser induced multiphoton dissociation of CTF3 is investigated. For the optimization of the performance of this working substance, trifluoromethane, the conditions to yield high-selectivity at high-operating pressure and low-critical fluence for complete dissociation are studied using our deconvolution procedure. The irradiation conditions are varied over the following ranges; wavenumber: 1052–1087 cm−1, gas temperature: 25°C to −78°C, CHF3 pressure: 5–205 Torr. The selectivities exceeding 104 are observed for 85–205 Torr CHF3 at −78°C by the irradiation at 1057 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688351
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  • 9
    Electronic Resource
    Electronic Resource
    IR absorption enhancement for physisorbed methanol on Ag island films deposited on the oxidized and H-terminated Si(111) surfaces: effect of the metal surface morphology (1999)
    Springer
    Applied physics 69 (1999), S. 77-80 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.35; 68.55; 78.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Infrared absorption measurements using a multiple internal reflection geometry are reported for condensed methanol at 90 K on Ag island films deposited on the oxidized and hydrogen-terminated surfaces of Si(111). The attenuated total reflection (ATR) spectra obtained as a function of methanol exposure (up to 14 L) show that a 1-nm mass thickness of Ag island film on the oxidized Si(111) surface yields an absorption intensity 2–3 times larger than the intensity in the absence of Ag on the oxidized surface. Deposition of the same thickness of Ag on the hydrogen-terminated Si(111) surface results in approximately twice the enhancement. The different magnitudes of the enhancement are discussed based on SEM micrographs for Ag island films formed on the oxidized and H-terminated Si(111) surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050974
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  • 10
    Electronic Resource
    Electronic Resource
    Laser isotope separation of tritium from deuterium: CO2-laser-induced multiphoton dissociation of C2TF5 in C2DF5 (1983)
    Springer
    Applied physics 32 (1983), S. 33-34 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 82.40 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Isotope separation of tritium from deuterium in heavy water was attempted by CO2-laser-induced, highly-selective multiphoton dissociation of C2TF5 present in C2DF5. Single-step T/D separation factors exceeding 3000, 1000, and 500 were attained, respectively, for the first time with CO2 laser 10P(34) 931.0 cm−1 at 10, 20, and 30 Torr pentafluoroethane pressures at −78 °C (i.e., equivalent to 15, 30, and 45 Torr at room temperature).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688772
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