Fermilab Neutron Therapy Facility / Neutron Spectrum Determination By Threshold Foils

oS(FNDA2006)041 © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence

Determine the swath grazing and forage quality potential of Westford forage barley and Manta and German foxtail millet for beef cattle in southwest Saskatchewan

Non-Peer ReviewedThe drought and poor moisture conditions experienced throughout Saskatchewan has revealed the potential that certain foxtail millets can play as an important short-season hay or grazing resource. The study’s objectives were to 1) determine the swath grazing performance of cow/calf pairs on Westford barley (WB) (Hordeum vulgare), and on two foxtail millets (Setaria italica), German (G) and Manta (M); 2) determine the forage quality composition of the WB and millets at different stages of maturities and during field curing. In 2002, the WB and the two millets were each seeded into a 2.2 acre field and each cereal treatment was replicated twice (n = 6). Seeding rate for the WB and millets were 80 and 12 lbs per acre, respectively. In 2003, all cereals were once again seeded into the same fields. In 2002, the WB was swathed at the soft dough stage and the G and M were at the boot and heading stage of maturity, respectively. Eight cow/calf pairs were used to graze each of the G and M pastures, but the WB forage material spoiled before cattle could graze. Poor moisture conditions experienced in the summer of 2003 produced little WB and millet growth, thus no grazing data was collected. 2002 results found higher % ADF and NDF and lower % CP and OMD for the millets compared to the WB. Animal performance (i.e., ADG, TLP etc.) did not differ (P>0.10) between the two millets. Calves gained between 1.8 to 1.9 lbs per day while on the millet pastures; however cows on average lost weight. Forage quality (i.e., OMD and CP) of the two millet swaths did not change 32 days post harvest even though the swaths were rained on. Although the millets show excellent forage and grazing potential in 2002 the poor performance of the millets in 2003 reveals the need for longer grazing and forage research to be conducted to truly evaluate their overall potential for southwest Saskatchewan

Attitude Sensor Pseudonoise

Even assuming perfect attitude sensors and gyros, sensor measurements on a vibrating spacecraft have apparent errors. These apparent sensor errors, referred to as pseudonoise, arise because gyro and sensor measurements are performed at discrete times. This paper explains the concept of pseudonoise, quantifies its behavior, and discusses the effect of vibrations that are nearly commensurate with measurement periods. Although pseudonoise does not usually affect attitude determination it does affect sensor performance evaluation. Attitude rates are usually computed from differences between pairs of accumulated angle measurements at different times and are considered constant in the periods between measurements. Propagation using these rates does not reproduce exact instantaneous spacecraft attitudes except at the gyro measurement times. Exact sensor measurements will therefore be inconsistent with estimates based on the propagated attitude. This inconsistency produces pseudonoise. The characteristics of pseudonoise were determined using a simple, one-dimensional model of spacecraft vibration. The statistical properties of the deviations of measurements from model truth were determined using this model and a range of different periods of sensor and rate measurements. This analysis indicates that the magnitude of pseudonoise depends on the ratio of the spacecraft vibration period to the time between gyro measurements and can be as much as twice the amplitude of the vibration. In cases where the vibration period and gyro or sensor measurement period are nearly commensurate, unexpected changes in pseudonoise occur

Partial purification of tumour-specific transplantation antigens from methylcholanthrene-induced murine sarcomas by immobilized lectins.

Plasma membranes isolated from two immunogenic, non-cross-protecting, MC sarcomas were shown to retain the specific rejection antigens of whole cells as well as serologically detected H-2 antigens. Solubilization of the membranes with sodium deoxycholate gave quantitative release of H-2 and retained the rejection specificity of the tumour from which it was derived. Polyacrylamide-gel electrophoresis (PAGE) showed no extensive degradation of membrane components during solubilization. The solubilized TSTAs were further characterized and purified on columns of 4 different lectins immobilized on sepharose beads. TSTA from both tumours bound to WGA but not to Con A, LCH or RCA columns. Specific activity was retained after elution from the WGA column. Serologically detectable H-2 bound to the Con A and LCH columns only. Clear separation of H-2 from TSTA activity was thus obtained. Furthermore the WGA-binding material represents a source for further purification of TSTA molecules in order to explore the basis for their diversity

Assessing the winter hardiness of perennial cereal rye relative to winter cereals traditionally grown in western Canada

Non-Peer ReviewedPerennial cereal (PC) rye (Secale cereale x S. montanum) is reported to be a three to four year perennial forage crop. At AAFC-Swift Current, SK, PC rye was compared to three winter triticale varieties (Pika, Prego, and Bobcat), CDC Clair winter wheat and Prima fall rye for winter hardiness. Small plots were seeded at six dates (July 18, Aug. 3, Aug. 16, Aug. 30, Sept. 7, and Sept. 17) in 2001, with a defoliation treatment occurring during the first week of October. When compared to the winter cereals for winter survival under field conditions, PC rye was tied for second for a mid-July seeding date, and tied for first for early and mid-Aug. seeding dates. PC rye survival was not different (P>0.05) between varieties for late Aug. and Sept. seeding dates. Results found the optimum time to plant PC rye to ensure maximum winter hardiness was mid-to-late Aug. PC rye was sensitive to late-fall defoliation with the greatest survival reduction occurring for the mid-July seeding date

Galaxy Halo Masses from Galaxy-Galaxy Lensing

We present measurements of the extended dark halo profiles of bright early type galaxies at redshifts 0.1 to 0.9 obtained via galaxy-galaxy lensing analysis of images taken at the CFHT using the UH8K CCD mosaic camera. Six half degree fields were observed for a total of 2 hours each in I and V, resulting in catalogs containing ~20 000 galaxies per field. We used V-I color and I magnitude to select bright early type galaxies as the lens galaxies, yielding a sample of massive lenses with fairly well determined redshifts and absolute magnitudes M ~ M_* \pm 1. We paired these with faint galaxies lying at angular distances 20" to 60", corresponding to physical radii of 26 to 77 kpc (z = 0.1) and 105 to 315 kpc (z = 0.9), and computed the mean tangential shear of the faint galaxies. The shear falls off with radius roughly as expected for flat rotation curve halos. The shear values were weighted in proportion to the square root of the luminosity of the lens galaxy. Our results give a value for the average mean rotation velocity of an L_* galaxy halo at r~50-200 kpc of v_* = 238^{+27}_{-30} km per sec for a flat lambda (Omega_m0 = 0.3, Omega_l0 = 0.7) cosmology (v_* = 269^{+34}_{-39} km per sec for Einstein-de Sitter), and with little evidence for evolution with redshift. We compare to halo masses measured by other groups/techniques. We find a mass-to-light ratio of ~121\pm28h(r/100 kpc) and these halos constitute Omega ~0.04 \pm 0.01(r/100 kpc) of closure density. (abridged)Comment: Accepted for publication in ApJ (minor modifications) - 32 pages, 11 figs, 5 table

ANTIGEN-SPECIFIC SYNERGISM IN THE IMMUNE RESPONSE OF IRRADIATED MICE GIVEN MARROW CELLS AND PERITONEAL CAVITY CELLS OR EXTRACTS

A synergistic immune response to foreign erythrocytes may be induced in heavily irradiated mice injected with a mixture of isologous cells obtained from marrow and from the peritoneal cavity. Under appropriate conditions, homologous or heterologous peritoneal cavity cells, heat-killed cells, or cellfree extracts made from such cells are also effective. The activity of the peritoneal cavity cells or extracts is antigen-specific, in the sense that cells or extracts obtained from animals previously immunized with the test antigen produce much stronger synergistic effects than do cells from animals immunized with some other antigen; however, the peritoneal cavity cells or extracts are not immunogenic when tested in primed animals. The marrow cells, demonstrated to contain precursors of the antibody-forming cells produced during this synergistic immune response, also show a form of antigen-specificity