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  • 42.80  (1)
  • Aerospace Medicine  (1)
  • Atomic and molecular collisions and interactions  (1)
  • 1
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    Resonant structure of low-energy H_{3}^{+} dissociative recombination (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-03-17
    Description: Author(s): Annemieke Petrignani, Simon Altevogt, Max H. Berg, Dennis Bing, Manfred Grieser, Jens Hoffmann, Brandon Jordon-Thaden, Claude Krantz, Mario B. Mendes, Oldřich Novotný, Steffen Novotny, Dmitry A. Orlov, Roland Repnow, Tobias Sorg, Julia Stützel, Andreas Wolf, Henrik Buhr, Holger Kreckel, Viatcheslav Kokoouline, and Chris H. Greene High-resolution dissociative recombination rate coefficients of rotationally cool and hot H_{3}^{+} in the vibrational ground state have been measured with a 22-pole trap setup and a Penning ion source, respectively, at the ion storage-ring TSR. The experimental results are compared with theoretical... [Phys. Rev. A 83, 032711] Published Wed Mar 16, 2011
    Keywords: Atomic and molecular collisions and interactions
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Theory and practice of image formation by the photoprojection method of submicron patterns (1978)
    Springer
    Applied physics 16 (1978), S. 279-287 
    Details
    ISSN: 1432-0630
    Keywords: 42.80 ; 85.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Optical projection of masks is a very troublesome task if dimensions are in the submicron range. It is difficult to get an undistorted image in the resist. This problem can be overcome by introducing corrections in the penultimate mask. Till now this has been done by a trial and error method in which an acceptable pattern is made only after a time consuming iterative process. In this paper a description will be given of the image forming process in which diffraction at the penultimate mask and at the aperture of the lens are the critical features. Based upon this theory correction formulas are derived for the direct design of penultimate masks. Rules for maximum edge sharpness are given, so that the tolerance demands on the production process can be relaxed. Extensive experimental measurements are in good agreement with theory. It will be shown theoretically as well as practically that by asymmetrical arrangement of the optical system images of gratings with 0.2–0.3 μm linewidth can be obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885123
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Work capacity and metabolic and morphologic characteristics of the human quadriceps muscle in response to unloading (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The response of skeletal muscle to unweighting was studied in six healthy males who were subjected to four weeks of lowerlimb suspension. They performed three bouts of 30 consecutive maximal concentric knee extensions, before unloading and the day after (POST 1), 4 days after (POST 2) and 7 weeks after (REC) resumed weight-bearing. Peak torque of each contraction was recorded and work was calculated as the mean of the average peak torque for the three bouts and fatigability was measured as the decline in average peak torque over bouts. Needle biopsies were obtained from m. vastus lateralis of each limb before and at POST 1. Muscle fibre type composition and area, capillarity and the enzyme activities of citrate synthase (CS) and phosphofructokinase (PFK) were subsequently analysed. Mean average peak torque for the three bouts at POST1, POST2 and REC was reduced (P 〈 0.05) by 17, 13 and 7%, respectively. Fatigability was greater (P 〈 0.05) at POST2 than before unloading. Type I, IIA and IIB percentage, Type I and II area and capillaries per fibre of Type I and II did not change (P 〉 0.05) in response to unloading. The activity of CS, but not PFK, decreased (P 〈 0.05) after unloading. The weight-bearing limb showed no changes in the variables measured. The results of this study suggest that this human lowerlimb suspension model produces substantial impairments of work and oxidative capacity of skeletal muscle. The performance decrements are most likely induced by lack of weight-bearing.
    Keywords: Aerospace Medicine
    Type: Clinical physiology (Oxford, England) (ISSN 0144-5979); Volume 13; 4; 337-47
    Format: text
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