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Precise Vapor Pressure Measurement At High Temperature
"An apparatus using a silica Bourdon gage is described for the measurement of vapor pressures or dissociation pressures with an accuracy of 0.1 mm and 0.1 deg C up to maximum pressures of atmospheric or beyond and maximum temperatures of 650 to 1250 deg C. The method is applicable to corrosive substances, to substances whose vapor pressure is sensitive to slight changes in composition, and to substances difficult to purify of volatile contaminants which affect the vapor pressure."
Date:
November 1, 1957
Creator:
Machol, Robert E.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of Foreign Multiplier Phototubes
"Several multiplier phototubes produced by England, Russia, or Switzerland were evaluated for amplification, photocathode sensitivity, photo-electron collection efficiency, cathode uniformity, and dark current. A description of the various tubes by designation numbers is given, along nth a description of techniques and equipment used in testing."
Date:
January 1, 1958
Creator:
Bolakas, J. & Parker, P G.
Object Type:
Report
System:
The UNT Digital Library
Betatron Oscillation Frequency Shift Due To "N-Errors"
"Expressions are found to relate DELTA gamma to the n-errors.'' It is demonstrated that the integral n-value concept'' is of no use in the present case. A modification of integrated n-value'' is suggested."
Date:
July 1, 1957
Creator:
Lanza, G. & Steffen, Klaus G.
Object Type:
Report
System:
The UNT Digital Library
A Survey of Non-Fuel-Bearing Materials for the Marine Gas-Cooled Reactor
Results of an initial examination of non-fuel-bearing materials for the Marine Gas Cooled Reactor are presented. Areas given specific attention include structural and cladding materials and graphite moderator. Other areas not included because of classification include zirconium hydride moderator and control materials. In each report section, available pertinent information is summarized and a plan for future work is given.
Date:
May 1, 1958
Creator:
Bokros, J. C.; Dijkstra, L; & Merten, U.
Object Type:
Report
System:
The UNT Digital Library
Biological Effects of Radiation, and Related Biochemical and Physical Studies : Semiannual Progress Report [for] Period May 1, 1959 - October 31, 1959
Progress reports from four divisions are included: (1) Division of Biophysics; (2) Division of Clinical Investigation; (3) Division of Nucleoprotein Chemistry; and (4) Radiochemistry Section.
Date:
December 1, 1959
Creator:
Denues, Arthur Russell Taylor, 1914-
Object Type:
Report
System:
The UNT Digital Library
Research and Investigation Leading to Methods of Generating and Detecting Radiation in the 100 to 1000 Micron Wavelength Range of the Spectrum. Quarterly Progress Report No. 15 for 1 September to 1 December 1959
Purpose of this research is twofold:: (1) to uncover new principles or techniques from which a CW source of electromagnetic radiation for the low millimeter and submillimeter wavelength range can be developed; and (2) to develop suitable detectors, components, and measuring techniques for evaluating and using the radiation as a diagnostic tool for plasma physics
Date:
January 1, 1960
Creator:
Coleman, P. D.; Baird, J. R.; Enderby, C.; Hakki, B;; Kenyon, R. J.; Stafford, J. et al.
Object Type:
Report
System:
The UNT Digital Library
The Design and Uses of High Flux Research and Test Reactors
The need for thermal and fast neutron fluxes in the range of 1 to 5 x l0/ sup 15/ neutrons/cm/sup 2/(sec) for the production of heavy elements such as Cf/ sup 252/ and other special isotopes and for improving the quality of beam experiments, reactor materials testing work, and solid state research has led to plans for the construction of three ultra high flux research reactors. The designs of these and other high flux research reactors are based on the general technology of enriched tank-type reactors; however, they utilize the principle of separate fuel and moderator regions to achieve flux peaking in these regions. Thus, proposed designs take the form of an annular fuel region with internal and external moderating regions or an under moderated core with an external moderator or reflector. In such arrangements, the thermal flux peaks in the moderating regions and the fast flux peaks in the fuel region, which results in maximum fast and thermal fluxes per unit of power. Since most of the moderation of fast neutrons takes place outside of the fuel region, the thermal flux peaking depends on the number of fast neutrons leaking from the reactor core, which in turn depends on …
Date:
January 1, 1959
Creator:
Lane, J. A.
Object Type:
Report
System:
The UNT Digital Library
Progress Report No. 54 for the Period through April 30, 1959
This is the fifty-fourth progress report of the Laboratory for Nuclear Science at the Massachusetts Institute of Technology. Progress reported covers the period for Physics and Chemistry through April 30,1959. Progress is reported on: (1) Chemistry of the fission elements group, (2) Nuclear chemistry (inorganic) group, (3) Nuclear chemistry (organic) group, (4) Cosmic ray group, (5) High energy accelerator physics group, (6) Bubble chamber group, (7) Liner acceleratory group, (8) Rockefeller generator group, (9) ONR generator group, (8) Radioactivity group, (9) Cyclotron group, (10) Theoretical group, (11) Personnel listing.
Date:
May 1, 1959
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Finite Amplitude Stress Waves in Rocks
Production of new surface area by fracturing of rock behind an explosive-initiated high amplitude wave is probably an important mechanism for energy absorption in the region near n explosion in rock. Explosive-initiated high amplitude pulses in cylinders of three different rocks and two concretes were studied to determine the pulse amplitude need to damage the cylinders. An average high amplitude wave velocity of half the elastic wave velocity was observed in a porous limestone. Elastic theory is not expected to apply to a wave fracturing a rock. Rapid decreases in original free surface velocity of the greywacke rock which was most thoroughly tested indicate that this rock sustained tensile stresses about a hundred times greater than its probably tensile strength for times a long as fifty microseconds.
Date:
October 1, 1959
Creator:
Grine, Donald Reaville
Object Type:
Report
System:
The UNT Digital Library
The Direct Reading Height Gage and its Applications to Inspection Work : Model 1 and Model 2
The direct reading height gauge is a new and fast operating instrument designed primarily for checking hole patterns, but it can also be used for a number of other purposes as well. This report gives a brief review of what the gauge is, what it will do, and how it is operated. Speed and the elimination of most of the sources of error are its chief attributes.
Date:
December 1, 1953
Creator:
Shew, P. W.
Object Type:
Report
System:
The UNT Digital Library
A Discussion on the Layout of Elements of a Control Panel
This memorandum is an outline of the principles and methods employed by 5100 Human Engineering Personnel in consultation on test equipment panel layout. The process of control panel layout is partially formalized with particular emphasis on test equipment panels. An experimental method is proposed for selecting an optimum panel layout. The essential role of experimentation is pointed out. The optimal layout for a nonrepetitive procedure is deduced and generalized to give methods of layout solution for the general repetitive procedure.
Date:
August 1, 1955
Creator:
Beeler, J. R.
Object Type:
Report
System:
The UNT Digital Library
Note on the Numerical Evaluation of Integrals of the Form anti l*SUB infinity/*SUP infinity/ f(x) *phi/(x) dx, with Particular Reference to the Determination of the Expectation of a Function of a Normally Distributed Random Variable
This note is concerned with the numerical integration of the integrals of the form anti l*SUB infinity/*SUP infinity/ f(x) *phi/(x) dx is "smooth."
Date:
September 1, 1953
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Effect of Crystallite Size on the Bulk Density and Strength Properties of Uranium Dioxide Specimens
Fused uranium dioxide was separated into fractions of varying particle size by air separation. Specimens of the nominal size of 1/8 by 1/4 by 1½ in. were formed by hydrostatic pressing, firing, and lapping. Specimens prepared from the 0 to 5 μ fraction were the strongest and most dense. The room-temperature density was about 92% of theoretical and the room-temperature flexural strength was about 12,000 1b. per sq. in. When tested at 1000°C., the strength was about 18,000 1b. per sq. in. The flexural strength of specimens decreased and their density decreased as the starting particle size was increased. The crystallization of the urania fragments which had occurred during the firing treatment was observed.
Date:
June 1, 1955
Creator:
Burdick, Milton D. & Parker, H. S.
Object Type:
Report
System:
The UNT Digital Library
Intermediary Metabolism of the Photosynthetic Bacteria. Final Report
The primary purpose of these researches was to clarify the various functions of organic substrates in bacterial photosynthesis. The following aspects were investigated; (1) metabolic pathways under photosynthetic and oxidative conditions, (2) energy transfers occurring during the metabolism in cell free extracts, and (3) the relationship between photosynthetic rate and light intensity for selected organic substrates. The results of these investigations were summarized in a paper entitled "The Application of Carbon-14 to Studies on Bacterial Photosynthesis" which was submitted to the United Nations as a contribution to the International Conference on the peaceful Uses of Atomic Energy, Geneva, Switzerland, August 8-10, 1955. A reproduction of this paper constitutes a major portion of this report.
Date:
November 1, 1955
Creator:
Siegel, Jack M.
Object Type:
Report
System:
The UNT Digital Library
Uranium Accumulation in Plants as an Indicator of Uranium Deposits in the Soil. Final Report
An alpha scintillation method for the analysis of uranium accumulation in plants as an indicator of uranium deposits in the soil was developed.
Date:
March 1, 1956
Creator:
Kurtz, Edwin B., Jr.
Object Type:
Report
System:
The UNT Digital Library
The Development and Operation of the NRTS Laundry
Equipment lists and operating procedures are present for a laundry designed to wash contaminated clothing.
Date:
December 1, 1955
Creator:
Bonnett, John R.
Object Type:
Report
System:
The UNT Digital Library
Occurrence of Technetium in Nature : Final Report for the Period November 1, 1954 to August 31, 1955
Twelve neutron activation analyses for naturally occurring technetium-98 were performed. Positive results were obtained in ten cases. Precautions were taken to avoid interference by molybdenum and technetium-99. the cross section for the reaction [formula] as found to be equal to 4 +- 2 mb for the neutron spectrum of the vertical thimbles of the Argonne CP-5 reactor. The chemical state of molybdenum (VI) in basic solution was studied by an anion-exchange technique. Evidence was obtained for the existence of polymeric species at pH-values up to 14. Preliminary work on the stability of Domax-1 anion exchange resin in perchlorate media indicates rapid deterioration even at 0.2F ClO4-.
Date:
September 1, 1955
Creator:
Anders, Edward, 1926-
Object Type:
Report
System:
The UNT Digital Library
Photoelectric K and l Shell Absorption Coefficients for Highly Ionized Atoms
This technical report describes a simple way to calculate numerical values of K and l shell photoelectric absorption coefficients (averaged over subshells) for highly ionized atoms.
Date:
November 1, 1955
Creator:
Moszkowski, S. A. & Meyerott, Roland Edward
Object Type:
Report
System:
The UNT Digital Library
Underground Movement of Radioactive Wastes
The theory and preliminary laboratory investigations presented in this technical report were intended to examine the general feasibility of injection disposal of radioactive wastes and to establish an understanding of the phenomena governing the travel of trace chemicals through natural porous media. Detailed studies of fluid velocity variations resulting from density differences between the injected and displaced liquids have been made. the ion exchange studies have been limited to strontium and calcium. Strontium 90 is considered to be the most hazardous of the fission products and should represent the radioisotope upon which to judge the merits of injection disposal. Consideration should also be given to cesium in evaluation the health hazards of injection disposal.
Date:
August 1, 1955
Creator:
Kaufman, Warren J., 1922-; Orcutt, Richard G., 1924- & Klein, Gerhard, 1918-1987
Object Type:
Report
System:
The UNT Digital Library
High Altitude Cosmic Ray Neutron Intensity Variations
Three groups of balloon flights carrying unshielded boron trifluoride counters were made from geomagnetic latitudes 10.1°N, 55.1°N, and 88.6°N. From the data obtained, curves of slow-neutron intensity versus atmospheric depth for depths less than 700 millibars are plotted. The mean absorption lengths for neutrons in the equilibrium portion of the atmosphere were found to be [formula]. The depths of the neutron intensity maxima were found to be [formula]. From these results and those of other investigators, the variation of the mean absorption coefficient and the depth of the neutron intensity maximum are plotted as functions of the geomagnetic latitude. A family of curves of neutron intensity versus atmospheric depth is drawn for geomagnetic latitudes at 10-degree intervals between 0° and 90°N, and from this the low-energy neutron capture per square centimeter per second by the N14(n,p) reaction in the atmosphere is calculated and plotted as a function of geomagnetic latitude. It is found that the observed neutron intensity varies by about 420% from 0° to 90°N. A value of 5.8×10(18) sec-1 is obtained for the total number of low-energy neutrons captured in the atmosphere.
Date:
July 1, 1955
Creator:
Soberman, Robert K.
Object Type:
Report
System:
The UNT Digital Library
Development of a Gas Injector System for Homogeneously Labeling Gas Storage Reservoirs
"The laboratory experiments and field testing which were carried out in the development of a homogeneous gas labeling device are described. Detailed drawings of the injector and its most critical components are included. Recommendations are made for a production model of the device along with estimated costs of construction."
Date:
May 1, 1961
Creator:
Sewell, Curtis & Schulz, Isidor
Object Type:
Report
System:
The UNT Digital Library
Iteration Methods for Non-Linear Problems
The methods of successive displacements or relaxation methods are investigated for a class of nonlinear problems. In particular it is shown that these methods are applicable to a large class of nonlinear problems arising from variational problems which yield elliptic equations. Constructive existence and uniqueness theorems are presented for the discrete problem and criteria are given for a practical method of obtaining solutions. The example of a discrete Plateau problem is used to illustrate the feasibility of the results. The processes are also shown to apply to uniformly elliptic problems.
Date:
May 1, 1961
Creator:
Schechter, Samuel
Object Type:
Report
System:
The UNT Digital Library
Alternating Direction and Semi-Explicit Difference Methods for Parabolic Partial Differential Equations
"The energy method is applied to study the stability of two types of difference approximations to parabolic partial differential equations, the alternating direction methods Douglas, Peaceman, and Rachford, and a new semi- explicit method. Each difference scheme is proved to be unconditionally stable. These results apply to parabolic equations with variable coefficients, defined in cylindrical domains with an essentially arbitrary bounded base."
Date:
March 1, 1961
Creator:
Lees, Milton
Object Type:
Report
System:
The UNT Digital Library
Sherwood progress report no. 4, July 1959 - December 1960
"Activities related to Project Sherwood are summarized under the following topics: propagation of waves, macroscopic magneto-fluid dynamics, stability, particle orbits, cusped geometries, collisionless shock theory, and other subjects."
Date:
March 1, 1961
Creator:
Grad, Harold, 1923-
Object Type:
Report
System:
The UNT Digital Library