23 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Crystallography"  
Results: 1 - 23
open access

A Rapid Method for Determining Preferred Orientation in Rolled Uranium Rods

Description: Report covering an experiment on a method for determining the crystallographic orientation within uranium rods. From summary: "The crystallographic orientation existing in rolled uranium rods may be determined by comparing the diffraction pattern obtained from an unknown specimen with the diffraction pattern obtained from a sample known to be randomly oriented."
Date: January 7, 1953
Creator: Sanderson, M. J.; Cummings, W. V., Jr. & Hurst, R. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Crystal Cavities of the New Jersey Zeolite Region

Description: From abstract: The crystal cavities present in the mineral complex of the New Jersey traprock region have long excited the interest of mineralogists. In 1914 Fenner made the first detailed and comprehensive study of these cavities and suggested that babingtonite was the original mineral. Soon after this anhydrite was found occupying parts of some of the cavities at one of the quarries. At this time, too, Wherry concluded that glauberite was the original mineral of some of the cavities because o… more
Date: 1932
Creator: Schaller, Waldemar T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Ancient Volcanic Rocks of South Mountain, Pennsylvania

Description: From introduction: In December, 1892, as the result of field work on the part of Dr. G. H. Williams in the northern and of the writer in the southern portion of South Mountain, there appeared a preliminary description of two of the rock types, in which their identification as ancient volcanics was announced. In this bulletin it is proposed to substantiate that identification with more detailed proof. It is further proposed to show that these ancient igneous rocks were, at the time of their cons… more
Date: 1896
Creator: Bascom, Florence
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Paleozoic Section in the Vicinity of Three Forks, Montana

Description: From introduction: The Three Forks sheet of Montana includes the area lying between the parallels of 450 and 460, and extending from longitude 111 to 1120. The three forks of the Missouri river unite in the north central portion of this area about 5 miles south of the northern line of the map.
Date: 1893
Creator: Peale, Albert Charles
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Eruptive and Sedimentary Rocks on Pigeon Point, Minnesota, and Their Contact Phenomena

Description: From preface: The preparation of this paper is due to the fact that the eruptive rocks occurring on Pigeon point, Minnesota, may be taken as types of similar eruptives found so widely spread over the Huronian and Keweenawan areas surrounding Lake Superior, and to the peculiar nature of the alteration these have superinduced in the fragmental rocks through which they have broken.
Date: 1893
Creator: Bayley, William Shirley
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The crystal structure of thorium nitrate

Description: From introduction: "Studies were made of single crystals of thorium nitrate hydrate which we had available in this laboratory and from these we were able to determine the unit cell and find the thorium positions. These crystals contain on the order of six water molecules per thorium atom, but the exact composition is in some doubt."
Date: November 20, 1950
Creator: Templeton, David H. & Dauben, Carol H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Isothermal Transformation of Metastable Beta Uranium Single Crystals

Description: Abstract: "The transformation of metastable beta uranium crystals was found to proceed by a martensitic reaction at room temperature. The features of the transformation of particular interest were that individual uranium martensite plates formed isothermally and grew at a slow rate isothermally."
Date: November 19, 1952
Creator: Holden, A. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Generalized Crystallographic Structure Factor Programme for the IBM 1620 Computer

Description: Details are given of a programme written in FORTRAN without format for an IBM 1620 computer, which computers structure factors for crystals of any symmetry. X-ray scattering factors are approximated to by exponential functions. Lp and temperature corrections are incorporated in the computations of the intensities of X-ray and neutron data collected by either the powder method or the equatorial plane method from single crystals.
Date: 1963
Creator: Pryor, A. W. (Arthur William), 1928-
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Calculation of Crystal and Counter Settings for the Collection of Crystallographic Data with a Counter-Diffractometer in the Equatorial Plane

Description: Formulas are developed for the angle between any two vectors lying in a plane through the origin of reciprocal space. The application of these formulas for computing the counter and crystal angles for the collection of data with a counter-- diffractometer in the equatorial plane is developed, and a suitable computer program, written in FORTRAN without format suitable for an IBM 1620 computer, is described.
Date: January 1963
Creator: ryor, A. W. (Arthur William), 1928- & Sabine, T. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A 1620 FORTRAN Programme for the Calculation of Bragg Angles for use in Powder X-Ray Diffraction Investigations

Description: An IBM 1620 program is described that calculates the Bragg angles for cubic, hexagonal, and tetragonal crystal systems for use with powder x-ray diffraction techniques. Allowance is made for absent reflections in the case of face- and body-centered cubic and close-packed hexagonal materials.
Date: April 1963
Creator: Walker, D. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A 1620 FORTRAN Programme for the Refinement of Lattice Parameters by a Modified Least Squares Method

Description: An I.B.M. 1620 programme is described which calculates refined lattice parameters from X-ray diffraction data according to Hess' Method. The programme may be used for cubic, hexagonal, and tetragonal systems and three systematic error functions are included. The output includes the refined parameters their stand errors, and the misfit of the data at each experimental point.
Date: April 1963
Creator: Walker, D. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Space Groups and Lattice Complexes

Description: From Abstract: "The lattice complex is to the space group what the site is to the point group - an assemblage of symmetry-related equivalent points. The Tables list site sets and lattice complexes in standard and alternate representation. The higher the symmetry of the crystal structures is, the more useful the lattice-complex approach should be on the road to the ultimate goal their classification."
Date: May 1973
Creator: Fisher, Werner; Burzlaff, Hans; Hellner, Erwin & Donnay, J. D. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

X-Ray Analysis of the Complex Salts of the Glyoximes with Ni++. II Structural Analysis According to Patterson

Description: In continuation of the x-ray study of Ni-dimethylglyoxime and Ni-methylethylglyoxime, the Patterson xy plane projection is performed, and on the basis of the vectorial values and angles thus calculated a model of molecular structure is proposed which corresponds to the exigency of the crystallographic and physical-chemical property of the examined compounds.
Date: unknown
Creator: Milone, Mario & Tapi, Guido
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Molecular Geometry and the Vapor Pressure of Isotopic Molecules: C₂H₃D and C¹²H₂=C¹³H₂

Description: The isotopic vapor pressure ratio between monodeuteroethylene and ordinary ethylene has been measured in the temperature range 120°-180°K by differential manometry. The inverse isotope effect with C₂¹²H₃D is less than one‐half the effect observed with the dideuteroethylenes. This deviation from the rule of the geometric mean gives further support to the structural theory of isotopic vapor pressure effects and confirms the importance of quantum corrections of the order of (ℏ/kT)⁴ and higher. Vap… more
Date: 1962
Creator: Bigeleisen, Jacob; Stern, Marvin J. & Van Hook, W. Alexander
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Physics Division Supplement to Quarterly Report June, July, and August, 1953

Description: This technical report describes experimental nuclear physics, mass spectroscopy, crystallography, experimental reactor physics, theoretical physics (general), reactor theory, electronic digital computers, and applied mathematics and computations (general).
Date: November 1953
Creator: Turner, Louis Alexander, 1898-
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen