Lack of observational evidence for quantum structure of space-time at Plank scales

It has been noted (Lieu & Hillmann, 2002) that the cumulative affect of Planck-scale phenomenology, or the structure of space-time at extremely small scales, can be lead to the loss of phase of radiation emitted at large distances from the observer. We elaborate on such an approach and demonstrate that such an effect would lead to an apparent blurring of distant point-sources. Evidence of the diffraction pattern from the HST observations of SN 1994D and the unresolved appearance of a Hubble Deep Field galaxy at z=5.34 lead us to put stringent limits on the effects of Planck-scale phenomenology.Comment: 12 pages, 3 figures, accepter for ApJ

Condimental Stock Foods and Proprietary Remedies

Judging from the many inquiries that come to the Iowa Agricultural Experiment Station about the composition and merits of condimental stock foods\u27\u27 and \u27\u27tonics,\u27\u27 great quantities of these products are purchased by Iowa farmers and feeders. Their sale is built up largely by alluring advertisements, by the use of \u27\u27testimonials,\u27\u27 and by extravagant promises which in some cases cannot possibly be fulfilled. Without question, the consuming public pays out for these various secret proprietary preparations many times what they are actually worth

The Composition and Digestibility of Sudan Grass Hay

The introduction of Sudan grass (Andropogon sorghum var.) into the United States took place less than nine years ago, but since then this crop has become widely known and its popularity is rapidly increasing. Sudan grass, being an annual, does not make a good pasture plant, but gives excellent results as a hay or soiling crop; it might also be successfully made into silage if mixed with a legume

Influence of condition on maintenance requirements of dairy cattle

The ration of the dairy cow is used for maintenance, growth, the formation of body fat, the building up of the foetus and milk production, so the problem of feed utilizaton is a complicated one. \u27rhe maintenance ration is more easily studied than are the requirements for growth and productive purposes and yet many of the factors controlling it are not thoroly understood. Condition in dairy cattle has received little attention in investigational work and its influence on the maintenance requirements of animals has not been studied. In fact, the influence of condition on the maintenance requirements of all classe~ of farm live stock has been somewhat neglected. Yet the results of the investigation on dairy cattle here reported show that maintenance requirements for cows. in high condition are higher than for cows in low condition

Pasteurization of cream for buttermaking

In some European countries the pasteurization of cream for buttermaking is extensively practiced. Butter manufacturers in the United States have long recognized that this is a desirable procedure and they have written numerous letters to the experiment stations seeking information regarding it. In many cases it has been more or less difficult to answer these inquiries because of the comparatively small amount of experimental work which has been done along this line. The purpose of the experiments herein reported was to determine the value of pasteurization to those engaged in the manufacture of butter. In this connection the effect of pasteurization on the flavor of the butter, on the keeping quality, on the body, on the chemical composition, and on the mechanical losses was considered and an effort was made to determine the relative merits of the various methods of pasteurization

Composition and digestibility of Sudan grass hay

ThE.J introduction of Sudan grass (Andropogon sorglwrn var.) into the United States took place less than nine years ago, but since then this .crop has become widely known and its popularity is rapidly increasing. Sudan grass, being an annual, does not make a good pasture plant, but gives excellent results as a hay or soiling crop; it might also be successfully made into silage if mixed with a legume

Some Observations on the Effect of Iodine Administration upon Sheep

On account of the occasional incidence of goitre and death of lambs produced on the experiment station farm, an experiment on the administration of potassium iodide to the pregnant ewes was carried on in 1917-18. Three lots of four on the same ration were fed from 2 to 15 grains potassium iodide daily. Results on the prevention of goitre in the young were not conclusive, but the passage of the iodine into the milk of the ewes was demonstrated, and pronounced unfavorable results from too large a dose of iodine were obtained, especially in the lots receiving the larger allowances. These unfavorable effects were not particularly in the vigor of the new-born and the lack of resistance to disease

Short Cuts

A bit of Iowa clay (not any clay, but one that has just the right something in it) and a bit of lard tossed into the vats of sorghum sirup mills on Iowa farms have modified an old process in the making of sorghum that is resulting in clear golden sirup which is fully the equal of the product of the best commercial factories

Characterization of STARDUST target comet 81P/Wild 2 from 1996 to 1998

Wetensch. publicatieFaculteit der Wiskunde en Natuurwetenschappe

First Detection of NaI D lines in High-Redshift Damped Lyman-alpha Systems

A Near-infrared (1.18-1.35 micron) high-resolution spectrum of the gravitationally-lensed QSO APM 08279+5255 was obtained with the IRCS mounted on the Subaru Telescope using the AO system. We detected strong NaI D 5891,5897 doublet absorption in high-redshift DLAs at z=1.062 and 1.181, confirming the presence of NaI, which was first reported for the rest-frame UV NaI 3303.3,3303.9 doublet by Petitjean et al. This is the first detection of NaI D absorption in a high-redshift (z>1) DLA. In addition, we detected a new NaI component in the z=1.062 DLA and four new components in the z=1.181 DLA. Using an empirical relationship between NaI and HI column density, we found that all "components" have large HI column density, so that each component is classified as DLA absorption. We also detected strong NaI D absorption associated with a MgII system at z=1.173. Because no other metal absorption lines were detected in this system at the velocity of the NaI absorption in previously reported optical spectra (observed 3.6 years ago), we interpret this NaI absorption cloud probably appeared in the line of sight toward the QSO after the optical observation. This newly found cloud is likely to be a DLA based upon its large estimated HI column density. We found that the N(NaI)/N(CaII) ratios in these DLAs are systematically smaller than those observed in the Galaxy; they are more consistent with the ratios seen in the Large Magellanic Cloud. This is consistent with dust depletion generally being smaller in lower metallicity environments. However, all five clouds of the z=1.181 system have a high N(NaI)/N(CaII) ratio, which is characteristic of cold dense gas. We tentatively suggest that the host galaxy of this system may be the most significant contributor to the gravitational-lens toward APM 08279+5255.Comment: 22 pages, 6 Postscript figures, 3 tables, ApJ in press (Vol.643, 2 June 2006