Cattle Feeding Barns and Shelters

Cattle feeding barns, carefully planned and properly built for sanitation and convenience of man and beast, represent good investments. The types of shelters and barns described in this circular have been used long enough by successful breeders and feeders in this state to demonstrate their worth. They are both economical in construction and practical for cornbelt conditions

Postcard: 2680 Parkers Playhouse, Abilene, Kansas

This black and white photographic postcard features a three story building at Abilene, Kansas. Exterior stairs are on the right side of the building. A fence is on the right side of the card and another fence is in front of the building. Prairie grass is in the foreground with written text at the bottom of the card. Handwriting is on the back of the card.https://scholars.fhsu.edu/tj_postcards/2257/thumbnail.jp

Beef Cattle Equipment: Feeding Equipment for Cattle

Practically all of the pieces of cattle-feeding equipment described in this circular have been tried out for some years in the barns and feedlots of successful feeders. They may be \u27\u27home built\u27\u27 and when used will save time, labor and feed and add that much to the possibility of feeding cattle at a profit. Such feeding equipment as bunks, mangers, self-feeders for both grain and roughage, watering tanks, water storage tanks, cattle stocks, shipping crates, scale pens, dipping vats and the like, is necessary; the extent and kind of this equipment will depend upon the circumstances and needs of the individual feeder

Gas of self-avoiding loops on the brickwork lattice

An exact calculation of the phase diagram for a loop gas model on the brickwork lattice is presented. The model includes a bending energy. In the dense limit, where all the lattice sites are occupied, a phase transition occuring at an asymmetric Lifshitz tricritical point is observed as the temperature associated with the bending energy is varied. Various critical exponents are calculated. At lower densities, two lines of transitions (in the Ising universality class) are observed, terminated by a tricritical point, where there is a change in the modulation of the correlation function. To each tricritical point an associated disorder line is found.Comment: 19 pages, 6 figures. to appear in J. Phys. A : Math. & Ge

Architectural/Environmental Handbook for Extraterrestrial Design

Handbook on environmental and space utilization criteria for design of extraterrestrial manned spacecraft and shelter

Solar proton effects on austral ozone during the final months of 1989

Intense solar activity during 1989 prompted six major particle events. Four of these occurred between August and December. Energetic solar protons are a natural source of ozone depletion due to the nitric oxides they produce in the polar atmospheres. In particular, modelling (Reid et al., 1991) of an event that peaked on October 20 (with greater than 10 MeV proton flux of 73000 particles sq cm s(exp -1) ster(exp -1) yields 55 percent column density enhancements of NO over the southern polar cap. Total column ozone data from the total ozone ,mapping spectrometer (TOMS) instrument aboard the Nimbus 7 satellite used at times when solar illumination facilitates measurements by TOMS over the entire southern polar regions. The impact of odd nitrogen enhancements on the spatial extent of low total column ozone and of the total ozone mass, over a region August to December. Comparisons are made with previous years (1984 to 1988) of moderate solar activity. The effect, if any, of these events on ozone during times of heterogeneous chlorine chemistry and dynamic processes is discussed

An experimental investigation of chatter effects on tool life

Tool wear is one of the most important considerations in machining operations as it affects surface quality and integrity, productivity and cost. The most commonly used model for tool life analysis is the one proposed by F.W. Taylor about a century ago. Although the extended form of this equation includes the effects of important cutting conditions on tool wear, tool life studies are mostly performed under stable cutting conditions where the effect of chatter vibrations are not considered. This paper presents an empirical attempt to understand tool life under vibratory cutting conditions. Tool wear data are collected in turning and milling on different work materials under stable and chatter conditions. The effects of cutting conditions as well as severity of chatter on tool life are analyzed. The results indicate significant reduction in tool life due to chatter as expected. They also show that the severity of chatter, and thus the vibration amplitude, strongly reduces the life of cutting tools. These results can be useful in evaluating the real cost of chatter by including the reduced tool life. They can also be useful in justifying the cost of chatter suppression and more rigid machining systems

Gyromagnetic remanence acquired by greigite (Fe3S4) during static three-axis alternating field demagnetization

A magnetic study was carried out on lacustrine sediments from the Zoigebasin, Tibetan Plateau, in order to obtain a better understanding ofpalaeoclimatic changes there. Gyromagnetic remanence (GRM) acquisitionis unexpectedly observed during static three-axis alternating field (AF)demagnetization in about 20 per cent of a large number of samples. X-raydiffraction (XRD) analysis on a magnetic extract clearly shows thatgreigite is the dominant magnetic mineral carrier. Scanning electronmicroscopy (SEM) reveals that the greigite particles are in the grainsize range of 200-300 nm, possibly in the single-domain state. Greigiteclumps of about 3 mu m size are sealed by silicates. Fitting of XRDpeaks yields a crystalline coherence length of about 15 nm, indicatingthat the particles seen in the SEM are polycrystalline.GRM intensities of most samples are of the same order as the NRM, whileothers show much stronger GRM although their magnetic properties aresimilar. Variation of the demagnetization sequence confirms that GRM ismainly produced perpendicular to the AF direction. The anisotropydirection can be derived from GRM, but more systematic studies areneeded for detailed conclusions. An attempt to correct for GRM faileddue to high GRM intensities and because smaller GRM acquisition was alsofound along the demagnetization axis. Behaviours of acquisition and AFdemagnetization of GRM are comparable with those of NRM, ARM, IRM,indicating fine grain sizes of remanence carriers