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  • KLEIN-GORDON EQUATION  (1)
  • Key words: Machining; Nickel; Titanium  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Using High Pressure Coolant in the Drilling and Turning of Low Machinability Alloys (2000)
    Springer
    The international journal of advanced manufacturing technology 16 (2000), S. 85-91 
    Details
    ISSN: 1433-3015
    Keywords: Key words: Machining; Nickel; Titanium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The paper examines the results of machining tests carried out on two alloys commonly used in the aircraft industry, specifically, alphabeta type titanium alloy Ti6A14V and nickel-based superalloy of type 718. In view of their excellent mechanical properties and their resistance to a wide range of temperatures, these alloys are widely used in the manufacture of turbo-engine parts. They are extremely difficult to machine, however, for various reasons. The present aim is to consider how their drilling, turning, and milling could be made more productive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001700050012
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Invariance of the Massless Field Equations under Changes of the Metric (1998)
    Springer
    General relativity and gravitation 30 (1998), S. 379-387 
    Details
    ISSN: 1572-9532
    Keywords: MAXWELL EQUATIONS ; KLEIN-GORDON EQUATION ; NULL DUST ; LINEARIZED EQUATIONS ; EXACT SOLUTIONS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that the Maxwell equations with sources, expressed in terms of the covariant tensor field Fijand the current density four-vector Ji, are invariant under the change of the metric gijby gij ′= gij+ liljif liis a principal null direction of Fijand that an analogous result holds in the case of the massless Klein-Gordon equation if liis null and orthogonal to the gradient of the field and in the case of the null dust equations if liis parallel to the dust four-velocity. An elementary proof of the following generalization of the Xanthopoulos theorem is also given: Let (gij, Fij) be an exact solution of the Einstein-Maxwell equations and let libe a principal null direction of Fij, then (gij+ lilj, Fij) is also an exact solution of the Einstein-Maxwell equations if and only if (lilj, 0) satisfies the Einstein-Maxwell equations linearized about the background solution (gij, Fij). Furthermore, analogous theorems, where the source of the gravitational field is a massless Klein-Gordon field or null dust, are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018802624345
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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