41 Matching Results

Search Results

Results: 1 - 24 next
open access

Experimental Radiation Measurements in Conventional Structures: Part 2. Comparison of Measurements in Above-Ground and Below-Ground Structures From Simulated and Actual Fallout Radiation

Description: Report concerning the protection offered against radioactive fallout offered by two types of structures at the Nevada Test Site. Differences between above ground and underground structures are measured and compared to data taken from actual fallout conditions.
Date: February 1963
Creator: Burson, Z. G. (Zolin G.)
Partner: UNT Libraries Government Documents Department
open access

X-ray Crystallographic Data for Minerals

Description: The following report presents selected x-ray crystallographic data for approximately 300 minerals.
Date: February 1963
Creator: Robie, Richard A.; Bethke, Philip M.; Toulmin, Martha S. & Edwards, Jerry L.
Partner: UNT Libraries Government Documents Department
open access

Short Time Strength Data for CS 1830 Series Cb-1Zr, Annealed at 2200F

Description: This technical report is a summary of short time strength data for CS1830 series Cb-1Zr material. The data are presented as a function of fabrication history or the amount of cold work received during fabrication. Three fabrication categories were considered for comparison: forgings and extrusions; bar, plate, rod and pipe; and sheet and tubing. Forgings and extrusions having received no cold work showed the highest strength over the entire temperature range 68F to 2800F; bar, plate, rod and pi… more
Date: February 8, 1963
Creator: Watson, W. L.
Partner: UNT Libraries Government Documents Department
open access

Thermal Conductance of Metallic Surfaces in Contact

Description: "Research in thermal contact resistance at MIT and advances made during the past year are summarized. The problem of predicting cortact resistance is examined in an analysis of a model for the contact which relates the geometry of actual surfaces in contact to the contact model, and a deformation analysis which relates the contact geometry to the load carried by the surfaces. Experimental procedures are described and are applied to two stainless steel surfaces in contact and to W and graphite s… more
Date: February 1963
Creator: Henry, John Jewett
Partner: UNT Libraries Government Documents Department
open access

Fundamental Problem of Late Neurological EffectFollowing Acute Irradiation

Description: Since the end of the last century (Tarknow, 1896) radiation effect o the nervous tissue has been studied in experimental animals and humans by numerous investigators, using mostly pathomorphological changes as a parameter of radiosensitivity . With increasing time intervals following radiation, pathomorphological changes are more evident, which has been known for quite some time.
Date: February 1, 1963
Creator: Yamamoto, Y. L.
Partner: UNT Libraries Government Documents Department
open access

The Use of Tritiated Thymidine in the Study of Tissue Activation During Germination in Zea Mays L.

Description: The transition from dormancy to growth in plant seeds has been the topic of many biological studies (1,2). Of particular interest to the radiobiologist are the dramatic changes in radiosensitivity occurring soon after the soaking of the seeds (3). These changes are thought to be associated with the commencement of proliferative activity. The recently developed method of labeling DNA with tritiated thymidine allows analysis of proliferative activity in greater detail than was heretofore possible… more
Date: February 1, 1963
Creator: Stein, O. L.
Partner: UNT Libraries Government Documents Department
open access

The Calculation of Zero-Point Energies of Molecules by Perturbation Methods

Description: Two methods are proposed for calculating zero-point energies of molecules. The first makes use of the fact that one can easily write down the quantum mechanical Hamiltonian for a vibration system. The zero-point energy can then be obtained by a perturbation scheme without solving the secular equation. The second method requires a knowledge of the normal modes and frequencies of a reference molecule, but then enables one to calculate isotope effects by a perturbation scheme. The methods are appl… more
Date: February 1963
Creator: Wolfsberg, Max
Partner: UNT Libraries Government Documents Department
open access

Transport of FissionProducts Through the Soil Following Injection From a Well and Methods Used for Removal

Description: In the summer of 1960 one of the little used wells on the Brookhaven National Laboratory site became accidentally contaminated with radioactive material. The contamination was discovered during a routine sampling of all wells in the waste disposal area, so there was a period of several weeks between the time of discharge.
Date: February 1, 1963
Creator: Gemmell, L. & Pearsall, S. G.
Partner: UNT Libraries Government Documents Department
open access

Di-Interstitial Annealing During the First Neutron Irradiation of Graphite: The Mobility of C2

Description: Radiation and annealing mechanisms for dimensional and c-axis changes in which the di-interstitial can be mobile at any or all temperatures above absolute zero are shown to be concordant with earlier work used to determine the migration energy energy of single interstitials and the absolute rate of displacing atoms in graphite. The mechanisms account for the stability of c-axis and dimensional changes with time in the absence of irradiation and with observed c-axis annealing at room temperature… more
Date: February 1, 1963
Creator: Schweitzer, Donals G.
Partner: UNT Libraries Government Documents Department
open access

The Function of Bridging Groups in Electron-Transfer Reactions

Description: Electron-transfer reactions involving bridged transition states are examined from the point of view of adiabatic electron transfer theory. One important function of the bridging group is to decrease the effective dipole moment of the charge system of the reaction ions. The effect on the activation energy is different for outer-sphere and inner-sphere reactions. Trends in the halide and hydroxide catalysis of isotopic exchange reactions of transition metal ions are discussed.
Date: February 1, 1963
Creator: Hush, N. S.
Partner: UNT Libraries Government Documents Department
open access

Chronic Excess Salt Consumption as an Etiologic Factor in Human Hypertension

Description: Since 1940 it has been known that extra salt (i.e. sodium chloride) facilitated the development of experimental hypertension induced by various sterols; subsequently hypertension was induced by desoxycorticosterone acetate plus sodium chloride; then hypertension was produced by using hypertonic saline as the sole source of liquid; and finally, in 1953, Menesly and his associates reported that chronic ingestion of excess dietary salt alone would produce hypertension in rats. Furthermore, in conf… more
Date: February 1, 1963
Creator: Dahl, Lewis K.
Partner: UNT Libraries Government Documents Department
open access

Possibilities and Limitations in the use of Tritiated Thymidine for in Vivo Cytokinetic Studies on Lymphoreticular Tissue

Description: Tritiated thymidine (H3TDR), a specific precursor of deoxyribonucleic acid (DNA), has proved to be a valuable tool in the study of in vivo cellular kinetics. Various methods of analysis have been used in autoradiographic investigations of proliferative patterns and time parameters in different cell lines.
Date: February 1, 1963
Creator: Cottier, H.; Odartchenko, N.; Feinendegen, L. E. & Bond, V. P.
Partner: UNT Libraries Government Documents Department
open access

The Effects of Chronic Gamma Irradiation on the Growth of Kalanchoe cv. "Brilliant Star"

Description: Kalanchoe seedlings were exposed to 330 r/20 hrs/day from a Co60 source. Samples were harvested weekly. No new leaves were produced after initial exposure to irradiation. Mitosis in the apical meristem appears to have been suppressed. However, the axillary meristem and the cambium continue their activity. This results in a much broadened stem tip with enlarged cells, supported by a stout internode in which cell size has remained relatively normal but cell number has increased. After about 26 da… more
Date: February 1, 1963
Creator: Stein, O. L. & Sparrow, A. H.
Partner: UNT Libraries Government Documents Department
open access

Inelastic Interactions of 11.4 Bec/c π" Mesons in Hydrogen

Description: Production cross sections and angular distributions of Λ and K° particles produced by 11.4 Bev/c π" mesons in hydrogen have been measured. A systematic investigation was made of all two-body decays of unstable neutral particles. No events inconsistent with γ, Λ, or K° were found. Production cross sections, angular distributions and effective mass distributions of π mesons produced in 4-prong events were also measured. No evidence for dominance of any high mass multi-pion resonance was found. Bo… more
Date: February 1, 1963
Creator: Ferbel, T. & Taft, H.
Partner: UNT Libraries Government Documents Department
open access

Use of a Digital Computer in the Development of a Positron Scanning Procedure

Description: The problem to be discussed originates in our interest in the diagnosis and treatment of brain tumors. It has been established by others that some positron-emitting radioactive isotopes, in particular Arsenic-74 and Copper-64, can be causal to localize in brain tumors and thus to serve as agents for locating the tumors. Although other kinds of radioisotopes have also been used successfully in locating tumors, positron emitters have some especially attractive features. Their use is based on the … more
Date: February 1, 1963
Creator: Robertson, James S. & Niell, Arcadio M.
Partner: UNT Libraries Government Documents Department
open access

The Effects of Radiations of Different let on Early Responses in the Mammal

Description: This paper will first note briefly the place and status of radiobiotopical investigations with fast neutrons. The monoenergetic (fast) neutron technique employed at this laboratory will be then described and results of studies with various criteria-of-effect in the mouse will be reviewed. Finally, certain general patterns of response for these systems will be pointed out as functions of neutron energy.
Date: February 1, 1963
Creator: Bateman, J. L. & Bond, V. P.
Partner: UNT Libraries Government Documents Department
open access

The Fate of Transfused H3 Thymidine Labeled Bone Marrow Cells in Irradiated Recipients

Description: It has been established by chromosome marker studies, histochemical, immunological, and cytological methods that the hemopoietic tissues of animals exposed to lethal doses of whole-body irradiation can be repopulated by transfused autologous, homologous or heterologous bone marrow cells. However, the morphology of the cell responsible for the regeneration of hematopoietic activity in the various hemopoietic organs has not been identified. It has been shown that the bone marrow contains the cell… more
Date: February 1, 1963
Creator: Fliedner, T. M.; Thomas, E. D.; Meyer, L. M. & Cronkite, E. P.
Partner: UNT Libraries Government Documents Department
open access

Tissue Distribution and Storage Forms of Vitamin B12 Injected and Orally Administered to the Dog

Description: Previous attempts by the present authors to compare the behavior of orally administered vitamin B12 with that of injected material have been inconclusive. Thus, 30 days after administration to normal humans, 0.19% of a tracer amount (0.5 μg) of injected radioactive vitamin B12 is excreted per day; and in an independent study, the eventual daily output was found to be 0.23% of a 3 μg dose. By contrast the total excretion rate of normal vitamin B12 from body stores appears to be only ≈0.03% per d… more
Date: February 1, 1963
Creator: Rosenblum, Charles; Reizenstein, Peter G.; Cronicite, Eugene P. & Meriwether, Henry T.
Partner: UNT Libraries Government Documents Department
open access

Abscopal Effects of Localized Irradiation by Accelerator Beams

Description: The aim of this series of experiments was to evaluate the existence of abscopal effects of irradiation. No attempt was made towards the elucidation of mechanisms. Very early in the history of radiological research it was noticed radiation produces both local and general effects involving the entire body. Gauss and Lembcke introduced the term "Roentgenkater" (radiation sickness). They ascribed these "General Effects" to the circulation of toxic substances released from cells that disintegrated f… more
Date: February 1, 1963
Creator: Jansen, C. R.; Bond, V. P.; Rai, K. R. & Lippincott, S. W.
Partner: UNT Libraries Government Documents Department
open access

Thermodynamics of Fused Salt Mixtures From EMF Measurements. The Systems NaCl-KCl, NaCl-MgCl2, and NaCl-CeCl3.

Description: The following cells were operated at 820°C: [equations not transcribed] where the over-all reaction in each cell is simply the transfer of NaCl from pure NaCl to the mixtures of the right hand compartment. The porcelain acts as a pure sodium ion conductor in these cells. The relative partial molar free energy of mixing for sodium chloride, FMNaCl, is given by [equation not transcribed] where E is the EMF of the cell. Results are given over the entire composition range in each system and compare… more
Date: February 1, 1963
Creator: Egan, James J. & Bracker, John
Partner: UNT Libraries Government Documents Department
open access

Lysogeny in Rhizobium Leguminosarum and R. Trifolii

Description: Seven lysogenic strains - three of Rhizobium Leguminosarum and four of R-trifolii - were identified among a total of 54 strains from these two species and R. phascoli. The R. leguminosarum strain may be multiply lysogenic; two of them also produce lethal agents resembling bacteriocins in their effects. Lysogeny was confirmed by standard criteria of UV-inducibility, self-immunity, and reproductive ability. Lysogenic conversion involving symbiotic characteristics was not observed. A minimum of s… more
Date: February 1, 1963
Creator: Schwinghamer, E. A. & Reinhardt, D. J.
Partner: UNT Libraries Government Documents Department
open access

Effects of Trichinella Spiralis Infection on Incorporation of Amino Acids into Serum and Hemoglobin

Description: Encysted Trichinella spiralis larvae incorporated carbon-14 from mice fed diets containing C14 -labeled glycerine and DL-alanine. In general, a higher level of C14 activity (C14 per gram of dry tissue) was found in muscle larvae than in muscle tissue. The presence of encysted Trichinella larvae in the muscles of 56-day and 180-day infected mice did not alter incorporation of C14 from these amino acids into infected muscle protein when compared with noninfected muscle. These experiments were ext… more
Date: February 1, 1963
Creator: Hankes, Lawrence V. & Stone, Richard D.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen