Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2235-2239 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of hydrogen plasma erosion of glassy carbon implanted with tungsten has been studied for a dose of 2.5×1016 ions/cm2 and an average ion energy of 60 keV. Raman measurements of the tungsten-implanted layer prior to and after exposure to the hydrogen plasma revealed that the damaged layer induced by tungsten ion bombardment, unlike by C+ bombardment, has not been completely removed in the plasma erosion process. Auger profile measurements were performed on the as-implanted layer and after exposure to a hydrogen plasma for 1 h. By comparing the tungsten depth distribution for these two cases the hydrogen plasma erosion rate of tungsten-implanted glassy carbon has been estimated. It has been found that during the first hour of exposure to the hydrogen plasma the average erosion rate of the implanted layer was estimated to be 265±35 A(ring)/h. In contrast the erosion rate of unimplanted glassy carbon in the hydrogen plasma was found to be 3000±300 A(ring)/h.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 5687-5694 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The composition, distribution, and chemical bonding of tungsten-implanted glassy carbon have been studied for ion doses between 3.5×1014 and 1.5×1017 ions/cm2. The implantations were performed using a metal-vapor vacuum arc ion source which for an extraction potential of 20 kV yields a mean implant energy of 60 keV. The implanted layer was examined by Rutherford backscattering spectrometry and Auger profiling spectroscopy. In addition, volume effects were assessed by measuring the step height between implanted and unimplanted regions. It has been established that the implanted tungsten is bonded in a carbidic configuration. This is in agreement with thermodynamic data which favors carbide formation rather than separate phases of metallic tungsten and graphitic carbon. For the highest dose studied, 1.5×1017 ions/cm2, the tungsten distribution was found to be nearly constant near the surface followed by a decrease at larger depths. For ion doses up to 3.6×1016 ions/cm2, the maximum tungsten distribution was found to occur at a depth 300±100 A(ring) and the implanted and retained doses were found to be equal. For tungsten ion doses between 7.35×1014 and 1×1016 ions/cm2, the implanted region was found to be compacted by 300±100 A(ring). The latter is attributed to an irradiation-induced densification of glassy carbon from 1.5 to 2.1 g/cm3. This compaction effect is also found to occur upon C+ (30 keV) implantation for ion doses between 3×1016 and 1.3×1017 ions/cm2. In this case the implanted layer was compacted by 400±100 A(ring). For higher tungsten doses, a steep increase in compaction of the tungsten implanted layer was observed. This is attributed to chemical and sputtering effects.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3082-3087 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Following the pioneering work on metal vapor vacuum arc (MEVVA) ion sources at Lawrence Berkeley Laboratory by Brown and co-workers, the Australian Nuclear Science and Technology Organization (Ansto) commenced a program of research aimed at constructing a MEVVA based ion implanter. This phase of the program has been completed and the system is now in routine use for surface modification studies. The purpose of the present article is to give an overview of the Ansto implanter with particular reference to those features, such as triggering reliability, which entailed some developmental work. Finally, current ion implantation research activities on this system are briefly described.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 115-118 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A vacuum arc centrifuge is described which produces a rapidly rotating metal plasma column by means of the Lorentz force between the arc current and an applied axial magnetic field. Analysis of samples deposited on collector surfaces indicates mass separation of elements that increases with the radius. For the plasma formed from a brass cathode, the mass separation of zinc with respect to copper depends on the configuration of the power supply and applied magnetic field and can exceed 50% at the outer radius of the plasma.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 1631-1633 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The growth of diamond thin films on glassy carbon substrates has been investigated as a function of deposition time for different surface treatments. Implantation of Ti to a dose of 1.7×1017 cm−2 and abrasion with diamond powder have both been examined to determine their effect on film nucleation and growth. At the shorter deposition times studied, diamond nucleation was observed on all test samples with those subjected to the abrasive pretreatment exhibiting the higher growth rates. However, the adhesion and uniformity of films on unimplanted glassy carbon were found to deteriorate significantly following deposition runs of 14 and 21 h duration. This was attributed to a destabilization of the underlying surface caused by plasma erosion.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2077-2079 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hydrogen plasma erosion and abrasive wear resistance of glassy carbon implanted with tungsten has been studied as a function of ion dose. It was found that the onset of hydrogen plasma erosion inhibition occurred at a dose of ∼6.5×1015 ion/cm2. In addition, the tungsten implanted material exhibits an increase in wear resistance similar in magnitude to that obtained with nitrogen and other nonmetallic ions. Carbon ion implantation does not significantly inhibit erosion in a hydrogen plasma. Hence, the resistance to such erosion observed with tungsten implanted glassy carbon is believed to be due to a chemical effect specific to certain metallic ions. In contrast, increased wear resistance is a defect driven effect not specific to the ion used.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Cambridge : Cambridge University Press
    The @Cambridge law journal 41 (1982), S. 162-179 
    ISSN: 0008-1973
    Source: Cambridge Journals Digital Archives
    Topics: Law
    Notes: In a recent article in the Cambridge Law Journal, Laurence Goldstein argues that four problems of legal theory which are supposed to present elements of paradox are capable of a reasonably simple solution. I am interested here in only one of the problems discussed by Goldstein: that concerning the status of the rules of precedent. I agree with Goldstein that this problem has a reasonably simple solution: but I disagree with the solution he proposes. (Broadly this is that pronouncements on precedent do not establish rules of law.) I propose in this short article to offer what I believe to be a correct solution to this problem. The solution proposed is one which has already been suggested by A. W. B. Simpson in 1961 in “The Ratio Decidendi of a Case and the Doctrine of Binding Precedent” but there is, I believe, a defect in Simpson's formulation of the argument for it, which has impeded its general acceptance. In any event, as there is clearly still controversy about the issue, it seems worthwhile restating this solution with fresh arguments. I will first discuss the problem, then its proposed solution, then Simpson's discussion of the topic, and finally some further questions which are suggested by the proposed solution.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 82 (1978), S. 182-186 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 84 (1980), S. 467-471 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 39 (1983), S. 274-275 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The oxygen electrode provides a rapid, convenient assay for 4-hydroxyphenylpyruvate dioxygenase. However, due to the occurrence of a nonenzymic oxygen consumption when reducing agents were mixed witha,a′-dipyridyl, its use is restricted to species which do not require reducing agents or necessitates the addition of catalase to the reaction mixture.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...