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Solution and Theoretical Evaluation of Steady-state Equations in Continuous Zone Refining
This paper explains the differences and the reasons for the differences which exist between the theory of the zone-transport system of continuous zone refining as presented by W. G. Pfann and T. Abe. The identity between the mathematical model used to describe the zone-transport system and one of the models used to describe the recently reported matter-transport system is noted. Nondimensional equations for the zone-transport system are presented and the difference between the limit of alpha in the zone-void and zonetransport systems, when L sub e = 0, is correlated. (Author).
A Study of a Scintillation Mechanism
Scintillation was observed during an experiment with an Hg 198 light, a rotating mirror, and a Fabry-Perot interferometer. The mechanism postulated for the phenomenon is an acceleration component in the ray path, caused by curvatures within the mirror surfaces. (Author).
Directivity and Beamwidth Approximations for Large Scanning Dolph-Chebyshev Arrays
Directivity and beamwidth for radiation patterns corresponding to the optimum Dolph-Chebyshev design have heretofore been determined by means of formulas that, although exact, are intractable to computation and not particularly open to physical interpretation. Approximate but accurate formulas are presented here in closed form, for the purpose of easy examination and computation of directivity and beamwidth for large scannable Dolph-Chebyshev arrays. Array length, number of array elements, the spacing of these elements, and the sidelobe level desired are parameters in this study. The maximum achievable directivity for Chebyshev arrays is in principle limited, regardless of how large the array becomes. Data is given to establish the array length required to obtain a value of directivity at some prescribed level below the maximum value. Comparisons between exact and approximate theory are presented in graphical form in such a way as to illustrate the lower limits of array size for which the approximations are valid. Element spacings less than a half-wavelength are included in this study. (Author).
Molecular Structure of 2-(4'-amino-5'-azamethenyl Pyrimidyl)-3 Pentene-4-ol
An X-ray analysis of the molecular and crystal structure of 2-(4'-amino-5'-azamethenyl pyrimidyl)-3 pentene-4-ol was recently completed. Significant results of this work include the determination of the structural parameters of the pyrimidine ring with an accuracy hitherto unavailable in the chemical literature, and the elucidation of a comprehensive system of hydrogen bonds which, in large part, are responsible for the molecular packing as it exists in the crystal. Each molecule participates in a total of six hydrogen bonds. Two amino hydrogen atoms and one hydroxyl hydrogen atom participate in hydrogen bonds to other molecules and three nitrogen atoms (two in the ring and one in the long side-chain) participate in hydrogen bonds which have the hydrogen atom chemically bound to adjacent molecules. (Author).
Earth-to-space Communications at Millimeter Wavelengths
It is expected that with the exploration of outer space, a requirement for high data rate earth-to-space communication channels will arise. A program to investigate the feasibility of using the millimeter-wave region of the spectrum for this application is presented. The theory of atmospheric attenuation resulting from losses due to absorption, scattering and refraction processes is reviewed and used to estimate propagation losses produced by atmospheric gases, clouds and precipitation. Curves of total atmospheric attenuation and noise level as a function of meteorological parameters and antenna elevation angle are also presented. A series of experiments designed to obtain as much informatio...
DEBUG - An Extension to Current Online Debugging Techniques
A method for online assembly-language debugging which greatly simplifies several of the bookkeeping tasks characteristically associated with that process has been developed and implemented in a program for the UNIVAC M-460 computer at Air Force Cambridge Research Laboratories. With this program, an online user may insert or delete (in symbolic assembly language) any number of lines at any point in his previously assembled program in core, with the remainder of the program being relocated appropriately.
Isotope Shift of the Nitrogen Absorption Bands in the Vacuum Ultraviolet Region
The vibrational isotope shift of the nitrogen absorption bands has been studied in the 830-1000 angstrom region. A 3-meter normalincidence vacuum spectrograph was used with the helium continuum as background. (Author).
