The application of a small general purpose computer as an ``on line'' data acquisition device for M?ssbauer effect experiments is described. A method of conversion from analog to digital information ...
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The application of a small general purpose computer as an ``on line'' data acquisition device for M?ssbauer effect experiments is described. A method of conversion from analog to digital information and an outline of the computer program are given. The performance of the system is demonstrated by a M?ssbauer spectrum of iron sulphide (pyrite). The extension of these techniques to other experiments is briefly considered.
Higher‐order Markovsequences were constructed by a digital computer, converted into electrical pulse trains, and transduced to a high‐speed auditory display by earphones. Under appropriate conditions, the depth of s...
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Higher‐order Markovsequences were constructed by a digital computer, converted into electrical pulse trains, and transduced to a high‐speed auditory display by earphones. Under appropriate conditions, the depth of sequential information processing available to the auditory system is virtually without limit.
The nuclear magnetic resonance spectra (1H and 19F) of pentafluorobenzene at , 94.1, and 100.0 MHz have been analyzed. Subspectral analysis,perturbation theory, and direct analysis were applied to the low‐frequency s...
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The nuclear magnetic resonance spectra (1H and 19F) of pentafluorobenzene at , 94.1, and 100.0 MHz have been analyzed. Subspectral analysis,perturbation theory, and direct analysis were applied to the low‐frequency spectra in order to obtain all the magnitudes and relative signs of the parameters. It was demonstrated that although at high frequencies a loss of information due to weak coupling should in principle arise, it is still possible to obtain the same results by exploitation of high‐precision measurements through computer iteration and by double irradiation (tickling).
Measurements of the velocity and angular distribution of KBr formed in reactive collisions between crossed molecular beams of velocity‐selected K and thermal HBr(DBr) at a collision energy of 2.8 kcal/mole are descri...
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Measurements of the velocity and angular distribution of KBr formed in reactive collisions between crossed molecular beams of velocity‐selected K and thermal HBr(DBr) at a collision energy of 2.8 kcal/mole are described. The results have been subjected to a computer analysis to extract information about the center‐of‐mass (c.m.) distributions. For both isotopic systems, the c.m. recoil energy distributions are broad, and are similar in shape. The c.m. angular distributions are also broad; HBr shows relatively greater wide‐angle scattering than DBr. The total reactive cross section for K+HBr is 40% larger than that for K+DBr. Measurements of the angular distribution of nonreactively scattered K agree well with the results of Airey et al. in the region of the rainbow angle.
When a harmonic wave train traveling in an elastic rod strikes its interface with a contained fluid column of the same radius, some of the energy is transmitted to the fluid and the rest is reflected back down the rod...
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When a harmonic wave train traveling in an elastic rod strikes its interface with a contained fluid column of the same radius, some of the energy is transmitted to the fluid and the rest is reflected back down the rod. In the process, elastic energy is temporarily stored by the deformation of the rod's end face. To study these phenomena in detail analytically, a truncated eigenfunction expansion is used. The equations of motion and the transverse boundary conditions are satisfied exactly in the two media. The resulting eigenfunction expansions for the interface boundary conditions are truncated, and imposed at enough points along a radius on the interface to permit a solution of the resulting system of equations for the amplitude coefficients in the truncated series. The stress and displacement fields at any point in either medium, along with intensity, power, and transmission loss, are then reconstructed, using the appropriate truncated series. The computer results obtained for the case of Nylon and water over a limited frequency range validate the approximation procedure and provide new information about the stress and displacement fields as functions of frequency and location. At the frequency of “end resonance,” it is found that the transmission loss curve has a sharp peak, indicating a possible use for this configuration as an acoustic notch filter.
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