Showing papers by "Georgia Institute of Technology published in 1972"
TL;DR: The present status of the field of fluorescence yields, radiationless (Auger and Coster-Kronig) and radiative transition probabilities is summarized in this article, where experimental and theoretical results are included, and tables of best values of important quantities are presented.
Abstract: The present status of the field of fluorescence yields, radiationless (Auger and Coster-Kronig) and radiative transition probabilities is summarized. Tables of experimental and theoretical results are included, and tables of "best values" of important quantities are presented.
1,511 citations
TL;DR: A method for generating values of continuous symmetric random variables that is relatively fast, requires essentially no computer memory, and is easy to use is developed.
Abstract: A method for generating values of continuous symmetric random variables that is relatively fast, requires essentially no computer memory, and is easy to use is developed. The method, which uses a uniform zero-one random number source, is based on the inverse function of the lambda distribution of Tukey. Since it approximates many of the continuous theoretical distributions and empirical distributions frequently used in simulations, the method should be useful to simulation practitioners.
430 citations
326 citations
TL;DR: In this paper, the atomic positions in both synthetic and mineral fluorapatite (space group P63/m, a = 9.367(1) A, c = 6.884(1), and Z = 2) agree within less than 0.001 A. Although the new atomic parameters differ significantly from those reported nearly 40 years ago by Naray-Szabo and refined by Beevers and McIntyre, the differences generally represent improvements in precision rather than corrections.
171 citations
TL;DR: In this paper, a sample spacing criterion and a data minimization technique for measurements made over the surface of a plane in the near field of an antenna are presented and compared with those measured on a standard far-field range.
Abstract: A sample spacing criterion and a data minimization technique for measurements made over the surface of a plane in the near field of an antenna are presented. The sample spacing is shown to depend on the distance from the antenna to the measurement plane, and on the extent to which evanescent waves can be neglected. The near-field data minimization technique utilizes two-dimensional spatial filtering to effect a significant reduction in computational effort required to calculate selected portions of the far-field pattern. Far-field patterns of an X band antenna calculated from near-field measurements are presented and compared with those measured on a standard far-field range. The far-field calculations are repeated for several near-field sample spacings and for various post-filter sample rates.
161 citations
159 citations
TL;DR: Analysis of laser-excited Raman spectra of proinsulin in the solid state and aqueous solution indicates that extensive conformational changes have taken place in the conversion of native to denatured fibrous insulin and that fibrous diabetes exists in a β-conformation as proposed by Ambrose & Elliott (1951).
142 citations
TL;DR: In this paper, an approximate cost model for a quality control procedure for two or more related variables is investigated, and a method is presented to determine the optimal sample size, interval between samples, and critical region parameter for the Hotelling T2 control chart.
Abstract: An approximate cost model for a quality control procedure for two or more related variables is investigated. A method is presented to determine the optimal sample size, interval between samples, and critical region parameter for the Hotelling T2 control chart. This model is a multivariate analog of several well-known models for the univariate XI-chart. It is assumed that only one assignable cause of variation exists and the time between occurrences is exponentially distributed. Numerical results are provided in a particular bivariate case for several values of the cost coefficients. The behavior of the model to variation of the model parameters is discussed.
118 citations
TL;DR: In this article, it is shown that the far field sound pressure is directly proportional to the first Eulerian time derivative of the chemical reaction rate integrated over the reacting volume, and the characteristics of the correlation function for this reaction rate time derivative are investigated through elementary reasoning for several simple premixed turbulent flame models.
112 citations
90 citations
TL;DR: In this article, the least-squares solutions of Fredholm and Volterra equations of the first and second kinds are studied using generalized inverses, and the method of successive approximations, the steepest descent and the conjugate gradient methods are shown to converge to a least square solution or to the least squares solution of minimal norm.
TL;DR: The role of information during idea creation and idea submission is described and a model of a management information system is structured which is consistent with and supportive of researcher behavior and which includes technical planning, project selection, and manpower planning.
Abstract: Empirical work in industrial research organizations has provided data useful for better understanding researcher behavior during innovation. The role of information during idea creation and idea submission is described based on these data. A model of a management information system is structured which is consistent with and supportive of researcher behavior and which includes technical planning, project selection, and manpower planning. The critical problems of information search and dissemination are examined.
TL;DR: The Stanford Watershed Model as mentioned in this paper uses fixed equations containing variable parameters which are calibrated for a watershed by trial-and-error matching of simulated to recorded flows, which reduces estimating scatter and provides parameter estimates which were correlated with physical characteristics of the watershed and with watershed changes with urbanization.
01 Jan 1972
TL;DR: In this article, the impulse approximation for scattering from a many-body system is derived in the form of a series in inverse powers of the momentum transfer, and the coefficients in this series are written in terms of the two-body interaction potential and the particle density matrices.
Abstract: Corrections to the impulse approximation for scattering from a many-body system are derived in the form of a series in inverse powers of the momentum transfer $k$. The coefficients in this series are written in terms of the two-body interaction potential and the particle-density matrices. Application is made to the case of high-energy neutron scattering from liquid helium. Evaluation of correction terms corresponding to a single helium-helium collision during the neutron-helium interaction time indicates (a) a shift in the peak of the incoherent-scattering cross section toward lower energy by a constant amount, and (b) an asymmetry of the cross section with respect to neutron energy loss about its peak value. Numerical estimates are given for these two effects for $k=14.3$ ${\mathrm{\AA{}}}^{\ensuremath{-}1}$. Evaluation of condensate broadening due to multiple He-He collisions shows that the condensate-scattering contribution has a width proportional to ${k}^{\frac{1}{2}}$, and is thus distinguishable from the main noncondensate peak whose width is proportional to $k$. Estimates are given for requirements on experimental-resolution functions necessary to preserve this evidence of a distinct condensate contribution.
TL;DR: In this paper, the authors present the measurements of properties of the neutral atmosphere above 90 km which were obtained from these experiments, which are obtained from the ground-based experiments on the upper atmosphere using the radio meteor and spaced receiver drift methods.
TL;DR: In this article, the activation cross sections at 14.4 MeV were determined for isotopes of the following naturally occurring heavy elements: Os, Pt, Au, Hg, Tl and Pb using the mixed-powder method with Ge(Li) γ-detection.
TL;DR: In this article, the K-shell conversion coefficient ωk was measured independently by means of K-conversion electron-K x-ray coincidences and was then used to determinePk, the k-capture probability.
Abstract: The electron capture decays of133Ba (10.4 y) and139Ce (140 d) were investigated with high resolution Ge(Li) detectors. By x-ray — γ-ray coincidences values of the quantityPkωkɛk for various transitions in the decay of133Ba and139Ce are obtained. The factor ωkɛk was measured independently by means ofK-conversion electron-K x-ray coincidences and was then used to determinePk, theK-capture probability. The independent measurement of the product ωkɛk, together with recent accurate values of ωk, provides a new method for the accurate calibration of semiconductor x-ray detectors. In the decay of139Ce, a value ofPk=0.78±0.03 is found (where the error represents twice the standard deviation) from whichQec=326−30+70 keV to the139La ground-state is found by use of theory. In133Ba decay, values are found ofPk1=0.72±0.04 for theEC transition to the 437 keV level in133Cs,Pk2=0.80±0.07 to the 384 keV level, and from an independent measurement, the ratioPk1/Pk2=0.87±0.07. From these results the ground-state value ofQec=522−10+20 keV is derived from theory for133Ba decay. The gamma spectrum of133Ba also was remeasured. From the present gamma intensities and previous conversion electron intensities, new values forK-shell conversion coefficients are obtained. Previously reported γ-rays at 35 and 391 keV are not confirmed.
TL;DR: In this article, the vibration of simply supported cylindrical shells stiffened by discrete longitudinal stiffeners is investigated by using an energy method, and numerical results on frequencies and mode shapes computed for a shell stiffened with various number of stiffeners are presented and compared favorably with existing experimental results.
TL;DR: In this article, the theory of liquid motion with a free surface is presented for containers of various geometries, and forces and moments of the liquid exerted upon the vehicle are presented and a simple mechanical model is presented.
Abstract: SUMMARY The unrestrained free surface of a liquid has an alarming propensity to undergo large excursions for even very small motions of the container. This fact may endanger the stability, as well as the riding and maneuvering quality of the vehicle considerably. It is particularly true for fuel- or cargo tanks of automotive vehicles, railroad tank cars, for fuel tanks of large ships and tankers, for which violent sea conditions at times result in fairly large amplitudes of pitching, heaving and rolling, as well as for airplanes and spacevehicles flying through atmospheric disturbances. The response of liquids contained in cargo- or fuel tanks is therefore of quite some concern, especially in those cases where the sloshing liquid masses occupy a large amount of the total mass of the vehicle. For this reason the theory of liquid motion with a free surface is presented for containers of various geometries. Forces and moments of the liquid exerted upon the vehicle are presented and a simple mechanical model ...
TL;DR: In this paper, the state-of-the-art on the damping of combustion instability oscillations by short nozzles is reviewed and the relationship between this energy flux and engine stability is discussed.
TL;DR: In this paper, the crystal structure of Ni(DACO) 2 (ClO 4 ) 2 ·2H 2 O has been determined, and the coordination of the nickel is strictly planar and square within experimental error.
TL;DR: In this paper, the copper-oxygen complex of the Schiff base of pyrrole-2-carboxaldehyde and 3-aminopropanol was prepared, and the structure was solved from Patterson and electron density maps and refined by least-squares methods to a ocnventional R value of 0.076.
TL;DR: In this article, a generalized, geometrical approach is adopted in reviewing the basic relationships of projected structures, and expressions that correct for truncation and overlap of particles in thin foils are derived.
Abstract: SUMMARY
A generalized, geometrical approach is adopted in reviewing the basic relationships of projected structures. Projections of features from a plane to a projection line, and from a three-dimensional foil to a projection plane are considered briefly. The relationships that apply to apparent and total projections are next assembled for lines, surfaces and bounded regions. The properties of convex bodies, the geometrical attributes, and the related projected quantities are enumerated. The inter-relationships of important microstructural parameters are expressed for convex bodies in space, in sections, and in the projection plane.
Based on the important concept of total projection, expressions are obtained that correct for truncation and overlap of particles in foils. Approximations to the total projection are developed for lines obscured by surfaces, and for points hidden by surfaces in space. Finally methods for determining size distributions of particles in thin foils are reviewed and recent modifications to the original procedures are discussed.
TL;DR: In this paper, the problem of local buckling in tensioned sheets with holes is discussed in relation to its effect on fracture and fatigue characteristics, and the results of an experimental investigation designed to determine the tensile buckling stress are presented.
TL;DR: In this article, the frontal thickness of an oil slick can be expressed as a function of a densimetric Froude number based on properties of the stream and the density of the oil.
Abstract: An oil slick contained on the surface of a flowing stream may be divided into two zones of influence; a frontal region where dynamic forces are dominant and a viscous zone where viscous stresses determine the form of the slick It is shown that the frontal thickness of an oil slick can be expressed as a function of a densimetric Froude number based on properties of the stream and the density of the oil Dynamic effects cause the interface to become unstable when the densimetric Froude number exceeds a critical value and retention of a slick under such conditions becomes impossible
TL;DR: In this article, voltage fluctuations were measured across collodion membranes acting as a constraint between two identical aqueous salt solutions, in the presence of an applied electrical potential difference.
Abstract: Voltage fluctuations were measured across collodion membranes acting as a constraint between two identical aqueous salt solutions, in the presence of an applied electrical potential difference. Membranes with d-c resistance between 1 and 20 MΩ cm2 were studied, in solutions of KCl between 0.01 and 1.0 moles per liter.
TL;DR: This paper uses the special structure at a directed acyclic network with positive gains to develop an extremely simple and powerful algorithm for maximal flow.
Abstract: This paper uses the special structure at a directed acyclic network with positive gains to develop an extremely simple and powerful algorithm for maximal flow. Finiteness of the algorithm is achieved through a theorem characterizing basic solutions for this special network.
TL;DR: A Raman spectrum of rhombohedral zinc-insulin crystals is reported and partially interpreted, finding that the intrachain disulfide bond, A6-11, may have a local geometry different from that of the interchain disulfides, B7-A7 and B19-A20.