Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
Filter
  • 1985-1989  (8)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Hexagonal molybdates: Crystal structure of (Na.2H2O)Mo5.33[H4.5]0.67O18 (1987)
    s.l. : American Chemical Society
    Inorganic chemistry 26 (1987), S. 370-373 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00250a006
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Diagnostic instrument for the measurement of poloidal magnetic fields in tokamaks (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1552-1556 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A diagnostic system has been developed to measure the direction of the local magnetic field within the plasma of a tokamak by making use of Zeeman splitting in an injected neutral lithium beam. A linearly polarized dye laser is used to pump the π component of the 2S-2P resonant transition. The laser polarization is rotated at a fixed frequency, and phase analysis of the subsequent fluorescence identifies the local field direction. The instrument can monitor many radial points within the plasma simultaneously, allowing a current density profile to be determined on a single shot basis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138583
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Poloidal field measurements using laser-enhanced attenuation of an energetic lithium beam (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1617-1619 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The current density profile diagnostic system presently operating on the Texas Experimental Tokamak (TEXT) employs a cw dye laser system to induce fluorescence in a lithium beam injected into the discharge. Systematic effects due to the finite lifetime of the excited state and enhancement of the beam attenuation during laser excitation limit the application of this technique to plasma densities (approximately-less-than)1×1013 cm−3. Laser enhancement of beam attenuation results from the large collisional ionization cross sections of the excited Li 2P state compared to the 2S ground state. This effect is exploited in a new diagnostic scheme which uses the polarization modulation of the present technique, but monitors the enhanced attenuation as opposed to the fluorescence. Detailed modeling indicates that a collinear beams configuration, with a short pulse laser and time-of-flight signal analysis, will provide a measurement of the complete poloidal field profile on TEXT at plasma densities up to 3×1013 cm−3 with 16-ms averaging times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140164
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    cw dye laser system for Li-beam spectroscopy in a tokamak (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1843-1845 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The current-density-profile diagnostic system developed for the Texas experimental tokamak (TEXT) employs a cw dye laser system to induce fluorescence in a Li beam injected into a tokamak. This laser has spectral and polarization modulation requirements not available in commercial systems. The required spectrum is a bandwidth of approximately 5 GHz at a wavelength of 667 nm. The intensity within the bandwidth should be as uniform as possible, i.e., a quasicontinuum within the 5-GHz bandwidth. The polarization of the laser must remain linear, but the plane of polarization must be rotated at a high frequency, 50 kHz. The details of the Li atomic spectroscopy in a tokamak and the requirements of the diagnostic system that lead to these desired laser parameters will be addressed. The laser system and polarization modulator which have been developed will be discussed in detail, including both design and performance parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139147
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Triton confinement and energy-loss studies with a time-resolved neutron detector (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1126-1126 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The expected results are presented for a fast, selective 14-MeV neutron detector which should be capable of separately measuring the confinement and energy loss of fast tritons for the first time. The tritons, from D–D reactions in a deuterium plasma, are observed when they collide with deuterons while slowing down, producing a characteristic 14-MeV neutron. Triton experiments are an excellent test for the confinement of fusion-produced alphas in a self-sustained reactor, which is critically dependent on plasma heating by the alphas. The triton production rate is pulsed by injecting a burst of deuterium using a neutral-beam heating source. The temporal distribution of the 14-MeV neutron flux is determined by the confinement and slowdown rate of the tritons. The expected flux is calculated as a function of time for the predicted triton transport, anomalous particle losses, and anomalous energy-loss rates, thus demonstrating how the various effects can be separately determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138191
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Low-divergence, high-brightness lithium ion source for plasma diagnostics (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1735-1737 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Plasma diagnostics employing energetic lithium beams are in routine use on several present-day tokamak experiments. These measurements are constrained by the availability of a suitable lithium ion source. Necessary and/or desirable parameters include narrow energy spread, high-emission current density, simplicity, and long lifetime. The existing ion gun on the TEXT experiment uses the thermionic emitter β-eucryptite and meets the above requirements, except for being limited to a useful emission of about 4 mA. We will present design criteria and accelerator results for a new ion gun capable of 15-mA emission based on an increased emitter area. Important design considerations are the thermal and mechanical properties of the large (∼20 cm2) emitter area and the ion optics required to focus the emitted flux into a beam of ∼1-cm2 cross section. The potential improvement in the performance of both the TEXT and ASDEX diagnostic systems will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140095
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Poloidal magnetic field measurements on TEXT using the Zeeman current profile diagnostic (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1071-1071 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The Zeeman current-density profile diagnostic system installed on TEXT has observed the polarization shift of the π-line of the Zeeman split Li D lines due to the poloidal magnetic fields. The Li is injected into the plasma as a 95-keV neutral beam, and a cw dye laser is used to measure polarization shifts. The laser is tuned into resonance with the π-line and the polarization vector of the laser is rotated at 50-kHz using an electro-optic technique. The resulting 100-kHz laser-induced fluorescence signal is phase analyzed in order to observe the polarization shifts due to poloidal field. The Li beam intensity into the tokamak is approximately 1 mA and the dye laser intensity is 1 W at 3 GHz bandwidth. The diagnostic system and these early results will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138225
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Dysplasia and carcinoma in the rectal stump of total colitics who have undergone colectomy and ileo-rectal anastomosis (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 14 (1989), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: From a group of 374 patients with ulcerative colitis who underwent colectomy and ileo-rectal anastomosis between 1952 and 1976, 104 presented for follow-up rectal biopsies over a 5 year period to 1986. These patients have been followed for an average of 28 years since the onset of the disease (range 11–56) and provide a unique model for the study of the development of carcinoma in colitis. A total of 443 biopsies was examined and epithelial morphology assessed according to the classification of Riddell et al. (1983). Five patients developed carcinoma of whom two showed dysplasia in biopsies taken a year or more before the diagnosis; one showed dysplasia 2 months before the appearance of cancer, another synchronous with it, and in the fifth patient dysplasia was not detected. Of 20 biopsies classified as ‘indefinite for dysplasia, probably negative’, 80% were associated with subsequent resolution, while of nine ‘indefinite for dysplasia, probably positive’ biopsies, eight (89%) were subsequently associated with either carcinoma (six) or dysplasia (two). The results emphasize the danger of absolute reliance upon dysplasia in assessing individual cancer risk in colitics, appear to demonstrate the usefulness of Riddell's classification and provide additional information on the natural history of dysplasia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2559.1989.tb02147.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...