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Annual Report of the Silt Load of Texas Streams for Water Year, 1952-1953
Progress report documenting data collection related to the amount of silt carried by Texas streams and potential effects on water management infrastructure, with an explanation of methods, data broken down by various criteria, and analysis.
Date:
October 1954
Creator:
Bloodgood, Dean W.
System:
The Portal to Texas History
An error Analysis of R-C Timers
The results of this paper show that a variation is sensing voltage produces an error in timing which increases logarithmically with time interval. Also, variation in supply voltage produces the same type of errors, but the errors are decreased by the ratio of the sensing to supply voltage. An interesting conclusion from this analysis is that if the ratio of supply to sensing voltages is maintained constant, no change in timing will result.
Date:
August 27, 1954
Creator:
Stromberg, R. P. (Robert P.)
System:
The UNT Digital Library
Path of Triple Point for spherical Shocks Above a Rigid Plane
Paths of trip points of Mach reflections produced by 0.5-oz pentolite detonations have been observed for various burst heights. The slopes, Y, at points on the curved path are found to vary from values of Y predicted from plane shock wave data. This discrepancy is attributed to the shock strength conditions at the early inception of the Mach reflection, which later influence the triple point equilibrium, and in lesser degree to radius of curvature effects.
Date:
July 13, 1954
Creator:
Todd, Jay. Jr. & Schellenbaum, Ralph L.
System:
The UNT Digital Library
Radial Vibrations in Short, Hollow Cylinders of Barium Titanate
The mathematics has been developed for the determination of the radial coupling coefficient for a hollow cylinder of electro-strictive material whose length is small compared to its outside diameter.
Date:
December 10, 1954
Creator:
Stephenson , C. V.
System:
The UNT Digital Library
Behavior of Transistors in a Magnetic Field
Experiments are described which show that magnetic fields can exert a controlling influence on the operating characteristics of point contact transistors. The effect is especially evident when the transistor is operated in its negative resistance region. The frequency of an oscillator can be varied, or a switch made to trigger by applying a magnetic field to the transistor. Some applications of the principle are suggested; many more are evident.
Date:
August 11, 1954
Creator:
Sander, Howard H.
System:
The UNT Digital Library
The Shape of a Shock Wave Derived from a Spherical Shock Wave Incident on a Concave Wedge
When a one-half ounce spherical charge of high explosive is detonated over a flat plane bounded by a 5 degree incline, the type of phenomenon encountered depends on the distance from ground zero to a beginning of the incline. If this distance is 48" the wave assumes a smooth contour on the plane. Detailed investigation of the shock velocity above the plane reveals that there is a pressure gradient along the shock front for a considerable region which replaces the usual triple point.
Date:
July 7, 1954
Creator:
Todd, Jay, Jr. & Schellenbaum, Ralph L.
System:
The UNT Digital Library
Counting Room Equipment and Procedures and Sample Preparation
The following are some of the equipment currently used in the Health Physics counting rooms at the Laboratory: scintillation counters, end window beta-gamma counters, precipitcon beta-gamma counter, autoscaler beta-gamma counter, and continuous flow proportional counter. This technical report describes the equipment, supporting equipment, procedures, and sample preparation in use at the Laboratory.
Date:
May 1954
Creator:
Weiss, M. M. & Marshall, J. B.
System:
The UNT Digital Library
A Human Engineering Guide to the Arrangement of Elements on a Control Panel
This memorandum is a compilation of general information concerned with the arrangement of elements on a control panel. Arrangement considerations that lead to to improved ease and accuracy of operation are presented to assist the engineer in designing new control panels.
Date:
December 10, 1954
Creator:
Williams, H. L.
System:
The UNT Digital Library
Low Speed Wind Tunnel Tests of Several Airfoil Sections Through 360 ° Angle of Attack
A series of two-dimensional airfoils were run through a complete 360 ° angle of attack range to determine their low-speed force characteristics. The airfoils were chosen in an attempt to vary as many parameters (such as thickness, camber, thickness distribution, etc.) as possible with the limited number of shapes that time permitted. All airfoils tested had lift curves with two distinct stalls and quite similar drag curves between 0 ° and 90 ° angle of attack. The highly cambered sections developed peculiar characteristics in the inverted and trailing edge forward positions, as might be expected. The effective test Reynolds number of 0.81 x 10(6) based on the model chord of one foot.
Date:
October 14, 1954
Creator:
Reed, James F.
System:
The UNT Digital Library
Formulas Pertaining to Weak-Shocks
Certain solutions of the cylindrical wave-equation, such as the Possio integral, which are needed in the investigation of 2-dimensional weak-shocks are are determined in this paper.
Date:
December 20, 1954
Creator:
Owens, O. O.
System:
The UNT Digital Library
A Comparison of the Neutron Yields from Low-Voltage Sources
The description of the thick-target neutron yields from the D(t,n)He4 and the D(d,n)He3 reactions is calculated as a function of the energy of the bombarding particles. For 60-kev particles the ratio is 108. I increases to 168 at 100 Kev and to 194 for 120-kev particles. A qualitative discussion of the yields from various deuterium target leads to the conclusion that the greatest yield would come from the target which has the lowest stopping cross section per deuterium atom.
Date:
October 6, 1954
Creator:
Cooper, John N.
System:
The UNT Digital Library
Second Report on Liquid Metal Level Instrument
The liquid metal level instrument will operate at tank temperatures up to 1000 F. Overall system accuracy depends on operating conditions, as described in the report. Test accuracies from 2 to 8% have been obtained from full to empty tank. The primary detector unit successfully passed navy HI shock test.
Date:
December 21, 1954
Creator:
Droma, Clarence R.
System:
The UNT Digital Library
Numerical Calculation of Blast Waves in Non-Uniform Atmosphere
The problem of a blast wave propagating through an inhomogeneous atmosphere is set up for computation by the CRC LORA. Previous treatments of this problem have used various simplifying assumptions such as that of purely radial flow. Since, however, pressure gradients in this situation will not in general be in the direction of rays from the blast center, non-radial flow will exist, and there is reason to believe that for large distances this effect will play a prominent role. Therefore, a program was set up for the numerical calculation (on the CRCLORA) of the propagation of a blast wave from a ground burse with altitude effects and possible tangential flow taken into account. With initial conditions known, the program is designed to give the pressure, density, radial and tangential flow velocities after successive time intervals at 16 equally spaced positions on each of 16 straight rays emanating from the point of burst. These positions are shifted with time to keep up with the shock front. Rehmeyer's and Van Neumann's method is used to handle the discontinuous shock front. In this method an artificial viscosity term is introduced in the the equations of motion in order to smooth out the discontinuity, …
Date:
November 15, 1954
Creator:
Fife, Paul C.
System:
The UNT Digital Library
Pressurized Loop membrane Demineralizer Tests : Final Report [for] January-June 1953
A membrane demineralizer has been tested in a pressurized loop. The loop water resistivity was maintained in the 1-2 megohm range by ionized solid transfer in the demineralizer. The size and power requirement of the unit tested per gpm flow through the unit, were 2.3 cu ft and 100 watts. In view of the fact that present designed could reduce the size and required maintenance, further studies may be warranted.
Date:
September 15, 1954
Creator:
Rosenberg, N. W.
System:
The UNT Digital Library
Rates of Convergence in Numerical Solution of the Diffusion Equation
A basic technique in the design of a nuclear power reactor is to prescribe the dimensions and composition of a simplified model and to calculate the corresponding neutron flux and power distributions. Comparison of calculations for different models and of particular calculations to experimental results guides the physicist to a reasonable prescription. Until recently, the usual model had spherical or cylindrical symmetry. We have found it feasible to extend the methods to include a class of reactors in which there is variation of composition with respect to two space-dimensions. In this paper, we summarize some of our experience with these calculations.
Date:
1954
Creator:
Stark, R. H.
System:
The UNT Digital Library
Precise Closed-Form Solutions of Some Mixed Boundary Value Problems of Plane Elasticity
Precise solutions are given for the problem of the semi-infinite strip extending from x=0 to x=infinity, stress-free along the edges y= +-1, when the edge x=0 is subject (a) to a quadratic sheer displacement and zero normal stress, (b) to a cubic normal displacement and zero sheer stress. These are the two simplest (non-trivial) end problems of the semi-infinite strip, antisymmetric in y, that may be formulated. The corresponding symmetric problems (a) linear seer displacement and zero normal stress, (b) quadratic normal displacement and zero sheer stress, were solved in earlier papers.
Date:
1954
Creator:
Horvay, Gabriel, 1908- & Born, J. B.
System:
The UNT Digital Library
The Heat of Combustion of Calcium
Calorimetric combustions of calcium metal were conducted at an initial temperate of 25 degree under an oxygen pressure of 50 atm. The energy of combustion under these conditions was to be 15,649 joules/g. The corresponding standard heat of formation of the oxide from the elements is calculated to be -628.63 +- 0.99 kjourles/mole. this value if 1.1% more positive than the previous accepted value.
Date:
1954
Creator:
Huber, Elmer J., Jr & Holley, Charles E., Jr.
System:
The UNT Digital Library
The Equation of State of Gases by Shock Wave Measurements. II. The Dissociation Energy of Nitrogen
The results of equation of state measurements made behind strong shock waves in nitrogen are consistent only with the higher of the two spectroscopically acceptable values of the dissociation energy of nitrogen, 9.764 ev.
Date:
1954
Creator:
Christian, R. H.; Duff, R. E. & Yarger, F. L.
System:
The UNT Digital Library
The Laplace Transform Method of Obtaining X-ray Spectral Energy Distributions
This method essentially consists of analyzing x-ray filtration data in terms of Laplace transforms and obtaining the spectral energy distribution in terms of a sum of the corresponding inverse Laplace transforms. Some of the functions which are especially suited for this application are given and a graphical method of analyzing filtration data in terms of these functions is described. Examples of the practical application of this method to several low energy x-ray machines are included with a discussion of the advantages, disadvantages, and probable uncertainties which are involved.
Date:
November 20, 1954
Creator:
Emigh, C. Robert
System:
The UNT Digital Library
One Million Frame per Second Camera
The design and construction of a 1,000,000 fps rotating mirror frame camera is described. Twenty five consecutive pictures 20 mm in diameter can be obtained on a strip of 35 mm film. A resolution of at least 20 lines/mm is obtained on a moderately fast film like Linagraph Shellburst. Accurate synchronization of the event to be photographed is required. The camera has been most useful in the investigation of explosive and related phenomena.
Date:
1954
Creator:
Brixner, Berlyn
System:
The UNT Digital Library
Mathematical Studies on Galvanic Corrosion. Part IV. Influence of Electrolyte Thickness on the Potential and Current Distributions over Coplanar Electrodes Using Polarization Parameters
Extensive numerical evaluation was performed on a Fourier series derived for the potential distribution in an electrolyte lying above a plane containing infinitely long, narrow electrodes juxtaposed and arranged in an infinitely alternating array with even symmetry. In contrast to the previous studies in this series, the limitation that the electrolyte has finite depth was imposed. Four perspective drawings of the reduced potential function were made to scale to illustrate the potential variation throughout the solution. From this study a practical rule was established for deciding from the behavior of the electrochemical system what effectively is an "infinite thickness" of the electrolyte. Current density variation over the anode was evaluated for several different combinations of relative thickness b/c and of relative polarization parameter ~/c. When b/c is small, the major part of the corrosion current is concentrated in the vicinity of the anode-cathode junction, provided that the electrical resistance of corrodent is not too high or the polarization too strong, i.e., provided that ~ is relatively small in comparison with c. Several graphs of C* (x) were included to illustrate the effects of the dimensionless groups (a/e), (b/c), and (~/c). Comparison with published experimental data was made, and the agreement …
Date:
1954
Creator:
Waber, James T. & Fagan, Bertha
System:
The UNT Digital Library
Equation of State of Solids
Data which determine points on the Hugoniot curves of fourteen solids are given in the technical report.
Date:
December 13, 1954
Creator:
Walsh, J. M. & Yarger, F L.
System:
The UNT Digital Library
The Spectrophotometric Determination of Dissociation Constants of Dibasic Acids. Methods Using a Minimum Amount of Data
Two spectrophotometric methods are given for determining dissociation constants of dibasic acids. Each method is applicable for any degree of overlapping of the dissociation constants. Neither method requires a direct measurement of the extinction coefficient of any of the individual species that are in equilibrium with each other. A minimum amount of data is required in either method.
Date:
January 1954
Creator:
Thamer, Burton J.
System:
The UNT Digital Library
Vapor and Liquid Phase Reactions Between Nitrogen Dioxide and Water
Knowledge of the mechanisms involved in the aqueous absorption of nitrogen oxides is limited, and no definite evidence has been available to indicate if the major chemical reactions involved occur in the gas phase or in the liquid phase. This work was undertaken to determine in which phases the chemical reactions occur and to obtain additional information on the over-all mechanism of the removal process. The results of this investigation show that the rate of absorption of nitrogen oxides decreases significantly as the operating temperature is increased. The major portion of the chemical reactions occurs in the liquid film and the gas film, with an appreciable amount of the reactions occurring in each.
Date:
1954
Creator:
Peters, Max S., 1920-2011 & Holman, J. L. (James L.)
System:
The UNT Digital Library