Herd health programs for swine seedstock production (1993)

This guide outlines good health practices for a seedstock swine herd. Preventive practices are emphasized. Specifics vary from herd to herd and are too individualized to address in this guide. Specifics should be worked out with the herd's veterinarian

Ranging system which compares an object reflected component of a light beam to a reference component of the light beam

A system is described for measuring the distance to an object by comparing a first component of a light pulse that is reflected off the object with a second component of the light pulse that passes along a reference path of known length, which provides great accuracy with a relatively simple and rugged design. The reference path can be changed in precise steps so that it has an equivalent length approximately equal to the path length of the light pulse component that is reflected from the object. The resulting small difference in path lengths can be precisely determined by directing the light pulse components into opposite ends of a detector formed of a material that emits a second harmonic light output at the locations where the opposite going pulses past simultaneously across one another

Diffraction-limited CCD imaging with faint reference stars

By selecting short exposure images taken using a CCD with negligible readout noise we obtained essentially diffraction-limited 810 nm images of faint objects using nearby reference stars brighter than I=16 at a 2.56 m telescope. The FWHM of the isoplanatic patch for the technique is found to be 50 arcseconds, providing ~20% sky coverage around suitable reference stars.Comment: 4 page letter accepted for publication in Astronomy and Astrophysic

Infectious causes of infertility in sows (1993)

Any time a sow farrows prematurely, there is the fear that additional litters will be lost. An abortion rate of less than 2 percent is considered an acceptable level in most herds. Premature farrowing usually results from nutritional, genetic or environmental stresses, but the exact cause is often unknown. This publication addresses several infectious causes of infertility and abortion in sows along with some preventive measures

Herd management for disease prevention (1993)

Disease control is only one facet of a successful management program. Treatment of disease is not as effective or as economical as prevention. Many outbreaks of disease in swine herds can be avoided by using management practices that include strict sanitation and immunization programs

Common internal parasites of swine (1993)

Swine performance is influenced by internal parasites, most dramatically in the young, growing pig. Parasites reside in the stomach and intestinal tract of the pig, causing irritation, impaction, indigestion and lack of appetite. Parasites cause loss of nutrients from feed consumed by competing with the host, and by causing poor digestion, gut ulceration and even blood loss

SM-1 RESEARCH AND DEVELOPMENT PROGRAM INTERIM REPORT NO. 2 ON CORE MEASUREMENTS. Task No. VII

Physics experiments were performed on the SM-1 core. Measurements were made on five rod bank positions and rod calibrations. The reactivity effects of core modifications were investigated. Modifications to the core included replacement of the boron absorbers in rods 1, 2, 3, 4 and C with europium absorbers; replacement of a control rod fuel element with one containing an integral europium flux suppressor; and replacement of a stationary fuel element. Additional experiments were designed to determine the reactivity of the SM-1 with 4 and 8 stationary elements removed; the neutron flux in the biological shield and in the region of an integrai europlum flux suppressor; and the gamma flux above the core and from irradiated control rod components. (auth

Infectious causes of infertility in sows

"Any severe illness in a pregnant sow may result in fetal death due to a disruption in the normal uterine environment. One, several or all fetuses in a litter may be lost. If fetal compromise occurs at less than 35 days of gestation, fetuses may be reabsorbed. If infection occurs between 35 and 70 days of gestation, fetal mummification occurs. If infection occurs after 70 days of gestation, pigs may be delivered weak or dead. This publication addresses several infectious causes of infertility and abortion in sows along with some preventive measures."Jeanette L. Floss (College of Veterinary Medicine), Roderick C. Tubbs (Swine veterinarian, Commercial Agriculture Program)Reviewed November 2018 -- websit

Lucky Imaging: High Angular Resolution Imaging in the Visible from the Ground

We use a Lucky Imaging system to obtain I-band images with much improved angular resolution on a ground-based 2.5m telescope. We present results from a 10-night assessment campaign on the 2.56m Nordic Optical Telescope and quantify the performance of our system in seeings better than 1.0''. In good seeing we have acquired near diffraction-limited images; in poorer seeing the angular resolution has been routinely improved by factors of 2.5-4. The system can use guide stars as faint as I=16 with full performance and its useful field of view is consistently larger than 40" diameter. The technique shows promise for a number of science programmes, both galactic (eg. binary candidates, brown dwarfs, globular cluster cores) and extragalactic (eg. quasar host galaxies, damped Lyman-alpha absorbers).Comment: 7 pages, 10 figures, submitted to A&A. For further information, see http://www.ast.cam.ac.uk/~optics/Lucky_Web_Site