633,342 research outputs found

    Vibration signature analysis of multistage gear transmission

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    An analysis is presented for multistage multimesh gear transmission systems. The analysis predicts the overall system dynamics and the transmissibility to the gear box or the enclosed structure. The modal synthesis approach of the analysis treats the uncoupled lateral/torsional model characteristics of each stage or component independently. The vibration signature analysis evaluates the global dynamics coupling in the system. The method synthesizes the interaction of each modal component or stage with the nonlinear gear mesh dynamics and the modal support geometry characteristics. The analysis simulates transient and steady state vibration events to determine the resulting torque variations, speeds, changes, rotor imbalances, and support gear box motion excitations. A vibration signature analysis examines the overall dynamic characteristics of the system, and the individual model component responses. The gear box vibration analysis also examines the spectral characteristics of the support system

    Computer program calculates sonic-boom pressure signatures

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    Computer programs calculate sonic boom characteristics of airplane configurations for a range of flight conditions. One program provides the area distribution, and another program provides the equivalent area due to lift. Program outputs are the complete near field /or far field/ pressure signature, including shock wave strengths and locations

    Tracing a phase transition with fluctuations of the largest fragment size: Statistical multifragmentation models and the ALADIN S254 data

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    A phase transition signature associated with cumulants of the largest fragment size distribution has been identified in statistical multifragmentation models and examined in analysis of the ALADIN S254 data on fragmentation of neutron-poor and neutron-rich projectiles. Characteristics of the transition point indicated by this signature are weakly dependent on the A/Z ratio of the fragmenting spectator source. In particular, chemical freeze-out temperatures are estimated within the range 5.9 to 6.5 MeV. The experimental results are well reproduced by the SMM model.Comment: 7 pages, 3 figures, Proceedings of the International Workshop on Multifragmentation and Related Topics (IWM2009), Catania, Italy, November 2009

    The Signature of God in Medicine and Microbiology An Apologetic Argument for Declarative Design in the Discoveries of Alexander Fleming

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    In logic and reasoning, a signature indicates the presence of an author; likewise, the characteristics of staphylococci indicate the presence of a Creator. Staphylococci and its “kind” are common bacteria, particularly in colonized people.1 Staphylococcus aureus has a complex molecular mechanism of assembling its golden pigment, staphyloxanthin. The biosynthesis of staphyloxanthin is a stellar example of irreducible complexity. Similar to staphylococci, the life and works of Alexander Fleming show the fingerprints of Providence. The so-called “serendipitous” achievements of Fleming have contributed to modern medicine, convincing Fleming and others that God was at work in his life. Fleming recognized that his life’s discoveries and the “weaving” of events were more than chance; it was the invisible hand of God on his life and works. The molecular complexities of staphylococci mechanisms and the achievements of Fleming indicate the signature of a divine Designer who has placed his signature on his art piece, staphylococci
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