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  • 1
    Electronic Resource
    Electronic Resource
    Vertical distribution of euthecosomatous pteropods in the upper 100m of the Hilutangan Channel, Cebu, The Philippines (1978)
    Springer
    Marine biology 48 (1978), S. 79-87 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The vertical distribution of euthecosomatous pteropods in the upper 100 m of the Hilutangan Channel, Cebu, The Philippines was studied, based on 126 samples, comprising 47, 282 individuals. Thirty-min horizontal plankton tows were performed at depths of 1, 20, 50, 70 and 100 m in January and February 1972. Thirteen species —including 3 subspecies — of juvenile and adult euthecosomes were identified. In decreasing order of abundance the species are: Creseis acicula (20.4%), Limacina trochiformis (19.9%), Creseis virgula constricta (14.6%), L. inflata (10.5%), Clio pyramidata (9.9%), Creseis virgula conica (8.9%), L. bulimoides (7.3%), Diacria quadridentata (5.3%), Cavolinia longirostris (1.9%), Creseis virgula virgula (1.0%), Hyalocylix striata (0.1%), Cuvierina columella (0.08%), Cavolinia uncinata (0.002%). In 3 species, a large percentage were juveniles; for 1 species, Clio pyramidata, only juveniles were caught. The Vertical species distribution was similar to the distribution of the respective species in Caribbean and Bermuda waters. Temperature, salinity and dissolved oxygen influence vertical distribution little, if at all.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390533
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  • 2
    Electronic Resource
    Electronic Resource
    Simultaneous determination of chromium (III) and copper (II) by using derivative spectrophotometry with MEDTA (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 464-466 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The application of derivative spectrophotometry to the simultaneous determination of chromium (III) and copper (II) with MEDTA is described. The procedure is suitable for concentrations of 0.40–2.60 mg ml–1 of chromium (III) and 0.15–0.60 mg ml–1 of copper (II). The main interferences, both anionic and cationic, are easily eliminated. The method was applied to different aqueous matrices. It was compared with an atomic absorption method and good results were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050190
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  • 3
    Electronic Resource
    Electronic Resource
    Laser-induced structural relaxation in Sb-rich SbGe films (1996)
    Springer
    Applied physics 62 (1996), S. 559-564 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.55; 78.65; 61.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Structural relaxation processes are induced by pulsed laser irradiation in amorphous SbGe thin films with compositions richer in Sb than the eutectics. These processes are studied by means of real-time optical measurements and transmission electron microscopy analytical techniques. The influence of the laser pulse length and the film composition is analysed. The results show that the relaxed amorphous material exhibits different optical properties, density and lower-energy density threshold for crystallisation. A qualitative change in the relaxation mechanism is observed when the composition of the films is slightly changed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01571693
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  • 4
    Electronic Resource
    Electronic Resource
    Critical parameters influencing the material distribution produced by pulsed laser deposition (1999)
    Springer
    Applied physics 69 (1999), S. S553 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.15.Fg; 79.20.Ds; 68.55.-a
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The parameters that control the thickness distribution of thin films produced by pulsed laser deposition are investigated. It is found that highly asymmetric material distribution profiles can be obtained in vacuum when high energy densities are used and the target surface is positioned at the lens focus. The asymmetries are due to asymmetries in the spatial distribution of the beam. Under Ar gas pressure, the profile becomes symmetric and the distribution narrows as a consequence of collisions between the ejected species and the gas. In vacuum, decreasing the energy density, by decreasing the laser energy output or by moving the lens to defocus the beam, leads to symmetric distribution profiles. Nevertheless, in the first case a quite broad distribution and a low deposition rate are obtained, whereas in the second case the distribution is narrow and the deposition rate increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051470
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  • 5
    Electronic Resource
    Electronic Resource
    A comparison of ns and ps steam laser cleaning of Si surfaces (1999)
    Springer
    Applied physics 69 (1999), S. S331 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.65.C; 79.60.Bm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. We report a quantitative investigation on the efficiency of the steam laser cleaning process using ns and ps pulses. Well-characterized polymer particles with a diameter of 800 nm dispersed on commercial Si wafers were chosen as a modeling contaminant system. As a result of our investigation, we show for the first time the feasibility of performing efficient steam laser cleaning with ps laser pulses and compare the achieved efficiency with the one obtained for ns pulses. For ns pulses, we found a cleaning fluence threshold of 50 mJ/cm2 that is independent of the pulse durations (2.5 ns and 8 ns) and the wavelengths (532 nm and 583 nm) used. The application of ps pulses (FWHM=30 ps, λ=583 nm) lowered this threshold to 20 mJ/cm2. Both cleaning thresholds are far below the melting thresholds for these laser parameters. Cleaning efficiencies 〉90% were reached for both pulse durations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051411
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  • 6
    Electronic Resource
    Electronic Resource
    Migration of Lead and Cadmium from Ceramic Materials Used in Food Preparation (2000)
    Springer
    Bulletin of environmental contamination and toxicology 65 (2000), S. 598-603 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0012800165
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  • 7
    Electronic Resource
    Electronic Resource
    Construction of CTB fusion proteins for screening of monoclonal antibodies against Salmonella typhi OmpC peptide loops (1996)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 141 (1996), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Mice were immunized with resin-bound peptides whose sequences have been proposed to be part of exposed loops in Salmonella typhi outer membrane protein OmpC. To screen hybridomas for monoclonal antibodies against those epitopes, we designed fusion proteins where the candidate peptide sequence was attached to the amino end of cholera toxin B-subunit (CTB). The constructed fusion proteins allowed the efficient selection of positive clones by GM1-ELISA. Selected antibodies recognized purified OmpC and whole Salmonella bacteria. This suggests a native structure of our genetically attached peptides in agreement with immunological properties reported for previous CTB recombinant fusion proteins. In a more general context, CTB hybrids could be used to screen for antibodies towards immunogenic epitopes in other systems. This might turn out to be particularly useful when producing antibodies against peptide sequences in microorganisms whose handling is difficult or that pose inherent health risks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1996.tb08359.x
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  • 8
    Electronic Resource
    Electronic Resource
    Reflectivity of crystalline Ge and Si at the melting temperature measured in real time with subnanosecond temporal resolution (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 3763-3767 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Real time reflectivity measurements with subnanosecond time resolution have been used to determine the reflectivity at the melting temperature RS(Tm) of single crystalline Ge and Si at 514.5 nm. Due to the excellent time resolution and sensitivity achieved in a single exposure experiment, the reflectivity of the solid just before melting could be measured. Values of RS(Tm)=0.470±0.006 and RS(Tm)=0.440±0.008 for c-Ge and c-Si have, respectively, been determined. These values, together with those determined by heating in vacuum in the range 300–800 K, are compared to those reported earlier in the literature and the differences are discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1350413
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  • 9
    Electronic Resource
    Electronic Resource
    Evidence for surface initiated solidification in Ge films upon picosecond laser pulse irradiation (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 3642-3649 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amorphous Ge films on Si films have been melted by single 30 ps laser pulses at λ=583 nm and a solidification process has been followed by means of real time reflectivity (RTR) measurements with nanosecond time resolution. Evidence is provided for the occurrence of surface initiated solidification for films with thicknesses in the 80–130 nm range. This process occurs at high fluences following complete melting of the film and of a thin layer of the Si substrate which undergoes mixing with the liquid Ge. The release of the solidification enthalpy of the latter layer together with its lower solidification temperature favored by constitutional undercooling are proposed as the origin of the initial gradient inversion required for such a process. This scenario leads also to the formation of a secondary solidification front counterpropagating towards the film surface, as suggested by optical simulations of the experimental RTR transients. A transition from a surface initiated solidification process towards a bulk solidification process is shown to occur when increasing the film thickness beyond 130 nm. The results further show that, besides the film thickness, the pulse duration has a major influence on the type of solidification process induced. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1347958
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  • 10
    Electronic Resource
    Electronic Resource
    On the effect of synchrotron radiation and magnetic fluctuations on the avalanche runaway growth rate (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 3814-3817 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The avalanche runaway growth rate was recently determined by analysis of the trajectories of the secondary runaway electrons in momentum space [Parks et al., Phys. Plasmas 6, 2523 (1999)]. Here, such an approach is used to study the effect of the electron synchrotron radiation and the magnetic fluctuations on the secondary generation of runaway electrons. It is found that not only the threshold electric field for runaway generation is increased due to these effects, but also the creation rate of secondary runaway electrons may be noticeably reduced for electric fields close to the threshold field. It has been shown that avalanche runaway generation can be efficiently suppressed in large tokamaks, even during major disruptions, for stochastic magnetic fluctuation levels b˜〉10−3. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287215
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