121,035 research outputs found

    Hieroglyphen / [erm. Hrsg.: Friedrich Traugott Hartmann]

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    HIEROGLYPHEN / [ERM. HRSG.: FRIEDRICH TRAUGOTT HARTMANN] Hieroglyphen / [erm. Hrsg.: Friedrich Traugott Hartmann] Hieroglyphen / [erm. Hrsg.: Friedrich Traugott Hartmann] ; [Erster Theil] ([Th. 1]) (1) Hieroglyphen / [erm. Hrsg.: Friedrich Traugott Hartmann] ; Zweiter Theil (Th. 2) (1) Hieroglyphen / [Hrsg.: Friedrich Traugott Hartmann] ; Dritter Teil (T. 3) (1) Hieroglyphen / [Hrsg.: Friedrich Traugott Hartmann] ; Vierter Theil (Th. 4) (1) Hieroglyphen / [Hrsg.: Friedrich Traugott Hartmann] ; Fünfter Theil (Th. 5) (1

    Hieroglyphen / [Hrsg.: Friedrich Traugott Hartmann] ; Dritter Teil

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    HIEROGLYPHEN / [HRSG.: FRIEDRICH TRAUGOTT HARTMANN] ; DRITTER TEIL Hieroglyphen / [erm. Hrsg.: Friedrich Traugott Hartmann] (-) Hieroglyphen / [Hrsg.: Friedrich Traugott Hartmann] ; Dritter Teil (T. 3) (1) Cover (1) Titelseite (5) Eine grausame Geschichte - Auszug aus einem Plane (7) Selenwanderung (69) Zur Galleri des Aberglaubens - Kapitulazions-Punkte (137) Lazarus läst einen Westphälinger arretiren (174) Zeitungen (212

    Magnetohydrodynamic turbulence in a Hartmann duct flow at finite magnetic Reynolds number

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    The dynamics of turbulent flow at finite magnetic Reynolds numbers can be very complex due to the coupled nature of the evolution equations for the flow and magnetic fields. In this regime, the Hartmann flow in a straight rectangular duct with streamwise periodicity is studied with the help of direct numerical simulations (DNS) and the effect of magnetic Reynolds number on turbulent statistics is quantified by comparing the results with the numerical results obtained using the quasistatic approximation

    An FPGA Architecture for Extracting Real-Time Zernike Coefficients from Measured Phase Gradients

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    Zernike modes are commonly used in adaptive optics systems to represent optical wavefronts. However, real-time calculation of Zernike modes is time consuming due to two factors: the large factorial components in the radial polynomials used to define them and the large inverse matrix calculation needed for the linear fit. This paper presents an efficient parallel method for calculating Zernike coefficients from phase gradients produced by a Shack-Hartman sensor and its real-time implementation using an FPGA by pre-calculation and storage of subsections of the large inverse matrix. The architecture exploits symmetries within the Zernike modes to achieve a significant reduction in memory requirements and a speed-up of 2.9 when compared to published results utilising a 2D-FFT method for a grid size of 8×8. Analysis of processor element internal word length requirements show that 24-bit precision in precalculated values of the Zernike mode partial derivatives ensures less than 0.5% error per Zernike coefficient and an overall error of <1%. The design has been synthesized on a Xilinx Spartan-6 XC6SLX45 FPGA. The resource utilisation on this device is <3% of slice registers, <15% of slice LUTs, and approximately 48% of available DSP blocks independent of the Shack-Hartmann grid size. Block RAM usage is <16% for Shack-Hartmann grid sizes up to 32×32

    Base composition of RNA obtained from motor neurons in amyotrophic lateral sclerosis

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    PT: J; CR: DANEHOLT B, 1966, J NEUROCHEM, V13, P913 DAVIDSON TJ, J NEUROPATHOL EXP NE DAVIDSON TJ, 1981, J NEUROPATH EXP NEUR, V40, P32 EDSTROM JE, 1964, METHODS CELL PHYSL, V1, P417 HARTMANN HA, 1968, ACTA NEUROPATH BERL, V11, P275 KOENIG H, 1969, MOTOR NEURON DISEASE, P347 RINGBORG U, 1966, BRAIN RES, V2, P296 SLAGEL DE, 1966, J NEUROPATH EXP NEUR, V25, P244; NR: 8; TC: 16; J9: J NEUROPATHOL EXP NEUROL; PG: 6; GA: LF726Source type: Electronic(1

    Acoustic characteristics of external chamfered Hartmann whistles

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    Experimental investigations are carried out on Hartmann whistles to explore the effect of external chamfer at the cavity mouth. The acoustic performance depends upon the cavity length, jet-to-cavity-spacing and external chamfer angle (15°, 30°, and 45°). The modifications in spectral and directional characteristics of external chamfered Hartmann whistles are studied in detail and are compared with a regular cavity. The frequencies are observed to attain a minimum value at a chamfer angle of 30° along with modification in the acoustic spectra. In general, it is noticed that the external chamfered whistles are directive at an emission angle of around 45° where it is around 37° for a regular whistle. Numerical simulations portray the flow/shock oscillation features in external chamfered cavities. Simulations depict intense flow diversion at the mouth of chamfered cavities and elucidate the directivity shift as well as the enhancement of acoustic power observed experimentally. Thus, it is observed that Hartmann whistles with external chamfering could radiate acoustic power up to 2.3 times that of a non-chamfered whistle
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