Silicon Nitride As A High-Temperature Radome Material (open access)

Silicon Nitride As A High-Temperature Radome Material

LRL has the responsibility of demonstrating the feasibility of a reactor for use as a power plant for a low-altitude, high-Mach-number missile. This reactor is literally a very high power air heater which must work at temperatures in excess of 2000' F. The reactor is exposed to high loads so one of the primary problems is providing high temperature structure. Considerable effort has been devoted to developing ceramic structural elements. One of the materials considered for this purpose is silicon nitride. In ceramic structural elements operating over large temperature ranges, a major problem is coping with thermal stress. In this respect there is a similarity with the radome problem. The work on silicon nitride at LRL consisted of limited fabrication studies (principally for familiarization), measurement of properties of interest to the application, and funding of fabrication scale-up efforts.
Date: May 19, 1964
Creator: Wells, William M.
Object Type: Report
System: The UNT Digital Library
A Solution of the Distributional Error Problem in Cytophotometry (open access)

A Solution of the Distributional Error Problem in Cytophotometry

Use of that portion of the characteristic curve of photographic film in which transmission is linear with log exposure eliminates the distributional error and thus makes possible the assessment of total mass of an inhomogeneously distributed cell consistent without scanning or measuring the cell's projected area. Measurement consists of obtaining the difference in output of a photocell receiving the total light transmitted by a photomicrograph of the cell, and a photomicrograph of the microscope field illumination against which the cell was photographed. A method of making such measurements is given, and its basis is described.
Date: December 19, 1961
Creator: Adams, Lawrence R. & Sondhaus, Charles A.
Object Type: Report
System: The UNT Digital Library
On Charge Conjugation (open access)

On Charge Conjugation

It is shown that under very simple and general assumptions the existence of an antiunitary reflection transformation and the charge gauge group implies the existence of an antiparticle corresponding to a given charged particle. Similar consequences follow on replacing the charge gauge group by the baryon gauge group. No assumptions as to specific wave equations, or indeed the existence of local fields, are made.
Date: July 19, 1961
Creator: Case, Kenneth M.
Object Type: Report
System: The UNT Digital Library
Variation with Electron Temperature of the Intensity Ratio of a Pair of Helium Spectral Lines (open access)

Variation with Electron Temperature of the Intensity Ratio of a Pair of Helium Spectral Lines

Abstract: "The dependence on mean electron kinetic energy of the ratio of intensities of [lambda]5015[HeI] and [lambda]4686[HeII] has been calculated. A low-density plasma is considered, the principal assumptions being that the reaction processes are governed by electron collisions and the electron energy distribution is Maxwellian. The results show a fairly large variation of the intensity ratio within the range of 3 to 7 ev."
Date: June 19, 1958
Creator: Howard, John C.
Object Type: Report
System: The UNT Digital Library
Direct Interaction Neutrons from 14-Mev Inelastic Neutron Scattering (open access)

Direct Interaction Neutrons from 14-Mev Inelastic Neutron Scattering

Abstract: "Neutron nonelastic cross sections measured at different detector biases have been used to determine the cross sections for inelastically scattering 14 Mev neutrons into 9- to 14-Mev energy range. The cross section for producing these high energy neutrons, which may be attributed to direct interaction processes, is roughly 10% of the nonelastic cross section, for all elements. A comparison is made with data of Coon and co workers, who measured angular distributions for the same high-energy inelastically scattered-neutron group."
Date: May 19, 1958
Creator: MacGregor, Malcolm H.
Object Type: Report
System: The UNT Digital Library
Fused Lithium Salts : A Bibliography Covering 1950-57 (open access)

Fused Lithium Salts : A Bibliography Covering 1950-57

This is a bibliography referencing documents based on fused lithium salts within the years 1950-57.
Date: May 19, 1958
Creator: Baughman, Dorothy & Maynard, G. R.
Object Type: Report
System: The UNT Digital Library
Neutron Nonelastic Cross-Section Measurements from 7 to 29 Mev (open access)

Neutron Nonelastic Cross-Section Measurements from 7 to 29 Mev

Abstract: "Neutron nonelastic cross sections have been measured for 23 elements at 14 Mev, and for a selected set of these elements over the energy ranges 7 to 14 Mev and 21 to 29 Mev. Conventional sphere transmission techniques were used for the measurements. A comparison with optical model calculations of Bjorklund and Fernbach shows excellent agreement."
Date: May 19, 1958
Creator: MacGregor, Malcolm H.
Object Type: Report
System: The UNT Digital Library
Die Design for Hot Presses ; [Bibliography] (open access)

Die Design for Hot Presses ; [Bibliography]

Abstract: "This is a selective bibliography of books and periodical articles relating to die design of hot presses. Sources consulted include: ASM Review of Metal Literature, 1950-1954; Chemical Abstracts, 1950-1055; Engineering Index, 1950-1055; Industrial Arts Index, 1950-March 1957; Metallurgical Abstracts, 1950-1953; Nuclear Science Abstracts, 1950-March 1957; Physics Abstracts, 1950-1955; the library card catalog, and the Technical Information Division AEC card catalog."
Date: April 19, 1957
Creator: U.S. Atomic Energy Commission
Object Type: Report
System: The UNT Digital Library
Some Aspects of the Research on Transcurium Elements at Berkeley (open access)

Some Aspects of the Research on Transcurium Elements at Berkeley

Report discussing the personal aspects involved in the research on transcurium elements at the Lawrence Radiation Laboratory, as well as a brief summary of previously unpublished work with heavy ions.
Date: April 19, 1957
Creator: Thompson, Stanley Gerald, 1912-1976
Object Type: Report
System: The UNT Digital Library
A Description of a Shock Wave in Free Particle Hydrodynamics with Internal Magnetic Fields (open access)

A Description of a Shock Wave in Free Particle Hydrodynamics with Internal Magnetic Fields

Abstract: "The structure of an extremely strong magnetohydrodynamic shock is discussed in the limit of no particle collisions. It is tentatively concluded that the shock transition takes place through the mechanism of a strong electric field produced by charge separation. The pressure in the shocked plasma is due primarily to a very high electron temperature. The ions, on the other hand, undergo an irreversible temperature change of only 3."
Date: February 19, 1957
Creator: Colgate, Stirling A.
Object Type: Report
System: The UNT Digital Library
Spectroscopy of High-Temperature Systems (open access)

Spectroscopy of High-Temperature Systems

Report discussing a study aiming to find which electronic state of the C2 molecule is the groud state.
Date: February 19, 1957
Creator: Hicks, William Thomas
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Some Aspects of the Radial Stability in a Magnetic Mirror Machine (open access)

Some Aspects of the Radial Stability in a Magnetic Mirror Machine

Abstract: "The radial motion of an ion in an axially symmetric magnetic field is discussed. It is pointed out that particles of constant velocity have clearly defined upper limits to their radial motion. This is a result of the other constant of the motion, the canonical angular momentum. These limits are independent of the number of times an ion is reflected from the mirrors, providing the field is truly axially symmetric."
Date: March 19, 1954
Creator: Henrich, Louis R.
Object Type: Report
System: The UNT Digital Library
Full Scale 48 MC Cavity For Sparking Tests of Gaps Corresponding to 0.45 To 4.5 Mev Beam Energy (open access)

Full Scale 48 MC Cavity For Sparking Tests of Gaps Corresponding to 0.45 To 4.5 Mev Beam Energy

It is proposed to test gaps corresponding to deuteron energies in the range of 0.45 to 4.5 Mev. The accelerator to be modeled is a 48 mc/sec cylindrical cavity in the TM010 mode with [formula] repeat length, [formula] gap, 0.25 megavolt per cavity foot peak r.f. gradient and strong focusing magnets alternating polarity at each drift tube.
Date: May 19, 1953
Creator: Unnam, Craig S.
Object Type: Report
System: The UNT Digital Library