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  • 1
    Electronic Resource
    Electronic Resource
    Application of a dc glow discharge source with controlled plasma potential in plasma immersion ion implantation (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 4821-4824 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A dc glow discharge source with controlled plasma potential was developed for application in plasma immersion ion implantation processing of materials surfaces. This type of ion implantation system allows cost effective surface modification of workpieces with complex shapes. The effects of the nitrogen plasma etching during the plasma immersion ion implantation process was studied using Si wafers as monitors, as we varied the externally controlled plasma potential between 0 and 350 V. When the plasma potential is controlled below 70 V, the ion implantation is dominant, otherwise the etching overtakes. The nitrogen implanted silicon wafers were analyzed by high resolution x-ray diffraction and Auger electron spectroscopy which revealed successful implantation of ions with accumulated nitrogen dose of 1.5×1017 cm−2, for the low potential case. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371448
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  • 2
    Electronic Resource
    Electronic Resource
    Performance characteristics of a new type of lead dioxide-coated titanium anode (1995)
    Springer
    Journal of applied electrochemistry 25 (1995), S. 817-822 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A new type of PbO2-coated metal anode, useful for electrochemical processing requiring the use of high-overpotential anodes, was prepared by applying to a titanium substrate an undercoating of Ti-Ta oxides, then covering the undercoating with an intermediate coating of stress-free α-PbO2 deposit, and finally covering the intermediate coating with a Ta2O5 particle-admixed β-PbO2 deposit. The anode thus produced was found to be superior to the anodized Pb or platinized Ti anode in respect of oxygen overvoltage, and corrosion resistance, even in solutions containing organic solvents. The possibility for use in chromium plating is also indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00233899
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  • 3
    Electronic Resource
    Electronic Resource
    Performance characteristics of a new type of lead dioxide-coated titanium anode (1995)
    Springer
    Journal of applied electrochemistry 25 (1995), S. 817-822 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A new type of PbO2-coated metal anode, useful for electrochemical processing requiring the use of high-overpotential anodes, was prepared by applying to a titanium substrate an undercoating of Ti-Ta oxides, then covering the undercoating with an intermediate coating of stress-free α-PbO2 deposit, and finally covering the intermediate coating with a Ta2O5 particle-admixed β-PbO2 deposit. The anode thus produced was found to be superior to the anodized Pb or platinized Ti anode in respect of oxygen overvoltage, and corrosion resistance, even in solutions containing organic solvents. The possibility for use in chromium plating is also indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00772199
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  • 4
    Electronic Resource
    Electronic Resource
    A Compact High-Voltage Pulse Generator for Plasma Applications (1997)
    Springer
    Astrophysics and space science 256 (1997), S. 533-538 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The design and construction of a compact high-voltage pulse generator for providing input electron beam power for the LAP/INPE 32 GHz gyrotron and for treatment of metal and polymer materials by plasma immersion ion implantation (PIII) are described. The generator was built on a circuit category of Pulse Forming Network (PFN), consisting of nine LC sections with L = 270 μH and C = 2.5 nF. The instrument was designed to produce a flat 30 kV, several Amps pulse in 15 μs pulse length with pulse repetition frequency (PRF) of 8 to 100 Hz. By means of a resonant charging inductance it is possible to gain an output voltage with a factor of 1.8 higher than the voltage supplied by the pulse generator. The generator is fed with sine-wave, constant current source, and a 60 kV, 15 mA switching power supply.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001123221816
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  • 5
    Electronic Resource
    Electronic Resource
    Plasma-Based Ion Implantation Treatments under Industrially Relevant Conditions (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 107 (Oct. 2005), p. 31-36 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Industrially relevant PIII conditions were applied to H13 and CrNiMo 316 steel as well as in CrCoMo and Ti6Al4V metal alloys. Typically, nitrogen ions were implanted at peak voltages of 10 to 15 kV, 50 to 80 (s pulse durations, and 1 to 2 kHz frequencies, for treatment times of 1 to12h. Case thicknesses of more than 20 μm were achieved in treated H13 steel which resulted in reduced friction and wear. For CrNiMo steel, a wear reduction of as high as 160 times was obtained besides a significant reduction of the coefficient of friction. Much thinner modified layer was obtained for Ti6Al4V but sufficient for an important improvement of the surface hardness
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/21/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.107.31.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Simultaneous observations of meteors with the radar and TV systems (1995)
    Springer
    Earth, moon and planets 68 (1995), S. 277-282 
    Details
    ISSN: 1573-0794
    Keywords: TV and radar meteor observation ; Geminids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We have carried out a simultaneous observation of radar and optical meteors with the MU radar (Middle and Upper Atmosphere Radar), Shigaraki and TV camera systems. We usually obtained about 20 meteors per an hour with 85 mm lens, but very small part of them are simultaneously observed by the MU radar (〈 5%), suggesting the significance of rectangular scatterring. We have analyzed about 20 simultaneous meteors with magnitudes from 0 to +5.5, most of which are overdense meteors. For Geminid meteors, a linear relation between the logarithm of the echo duration and the absolute magnitude of the TV meteor, was deduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00671516
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  • 7
    Electronic Resource
    Electronic Resource
    Television meteor radiant mapping (1995)
    Springer
    Earth, moon and planets 68 (1995), S. 585-603 
    Details
    ISSN: 1573-0794
    Keywords: Meteor radiant ; doubly observed television meteor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We have carried out double-station TV meteor observations between 1990 and 1994. The orbits of 326 meteors have been determined from doubly observed meteors, and radiant distributions are studied. The mean magnitude of the observed meteors was as faint as +4.7, since I.I. (Image Intensifier) and Video cameras were used. Radiants were widely distributed over the celestial sphere. The velocity distribution showed some similarity with the distribution predicted by the theoretical radiant distribution from comets rather than that from asteroids. In all 13 showers including both major and minor meteor showers were detected from radiant distributions of the observed meteors; from the orbital elements and meteor velocities as well as from the radiant directions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00671556
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  • 8
    Electronic Resource
    Electronic Resource
    A novel promoter, derived from the isocitrate lyase gene of Candida tropicalis, inducible with acetate in Saccharomyces cerevisiae (1995)
    Springer
    Applied microbiology and biotechnology 43 (1995), S. 489-492 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  When the isocitrate lyase gene, containing 5′-upstream and 3′-flanking regions, of an n-alkane-assimilating yeast Candida tropicalis was introduced into Saccharomyces cerevisiae, the enzyme was functionally overexpressed in the cells grown on acetate. The amount of the recombinant isocitrate lyase expressed in S. cerevisiae was as much as 30% of the total soluble proteins in the cells, being comparable to that with GAL7 functional under the control of galactose. The expression was also observed when the cells were grown on glycerol, lactate, ethanol or oleate. These facts indicate that the isocitrate lyase gene upstream region (UPR-ICL) contains a strong promoter functional in S. cerevisiae. UPR-ICL is active as a promoter on cheap carbon sources such as acetate and non-conventional carbon sources such as oleate, whereas many conventional strong promoters demand relatively expensive sugars or sugar derivatives. Therefore, it is promising to construct an economical recombinant protein production system by using UPR-ICL.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050439
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  • 9
    Electronic Resource
    Electronic Resource
    A novel heterologous gene expression system inSaccharomyces cerevisiae using the isocitrate lyase gene promoter fromCandida tropicalis (1996)
    Springer
    Applied microbiology and biotechnology 44 (1996), S. 759-765 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract We have found that the upstream region of the isocitrate lyase gene (UPR-ICL) from then-alkane-utilizing yeastCandida tropicalis was functional inSaccharomyces cerevisiae as a novel promoter with non-fermentable carbon sources, such as oleic acid, acetate, ethanol, and glycerol/lactate. The expression of two foreign genes coding for β-galactosidase fromEscherichia coli (LacZ) and glutamate decarboxylase from rat brain was carried out under the control of UPR-ICL. Expression ofLacZ was repressed by glucose and enhanced over 300-fold by acetate. When an expression vector pW13 containing multicloning sites between UPR-ICL and the transcriptional terminator of the isocitrate lyase gene (TERM-ICL) was used, the smaller isoform of glutamate decarboxylase (GAD65) was highly produced in a soluble and active form. These results demonstrate that the novel expression system using UPR-ICL and TERM-ICL fromC. tropicalis is useful for the production of heterologous proteins inS. cerevisiae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00178615
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  • 10
    Electronic Resource
    Electronic Resource
    Development of an arming yeast strain for efficient utilization of starch by co-display of sequential amylolytic enzymes on the cell surface (1999)
    Springer
    Applied microbiology and biotechnology 51 (1999), S. 65-70 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The construction of a whole-cell biocatalyst with its sequential reaction has been performed by the genetic immobilization of two amylolytic enzymes on the yeast cell surface. A recombinant strain of Saccharomyces cerevisiae that displays glucoamylase and α-amylase on its cell surface was constructed and its starch-utilizing ability was evaluated. The gene encoding Rhizopus oryzae glucoamylase, with its own secretion signal peptide, and a truncated fragment of the α-amylase gene from Bacillus stearothermophilus with the prepro secretion signal sequence of the yeast α factor, respectively, were fused with the gene encoding the C-terminal half of the yeast α-agglutinin. The constructed fusion genes were introduced into the different loci of chromosomes of S. cerevisiae and expressed under the control of the glyceraldehyde-3-phosphate dehydrogenase promoter. The glucoamylase and α-amylase activities were not detected in the culture medium, but in the cell pellet fraction. The transformant strain co-displaying glucoamylase and α-amylase could grow faster on starch as the sole carbon source than the transformant strain displaying only glucoamylase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051364
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