Molecular collisions. 12 - Generalized phase shifts

Rotational excitation in diatomic molecular collisions to obtain equations for generalized set of phase shift

Molecular collisions 21: Semiclassical approximation to atom-symmetric top rotational excitation

A distorted wave approximation to the T matrix for atom-symmetric top scattering was developed. The approximation is correct to first order in the part of the interaction potential responsible for transitions in the component of rotational angular momentum along the symmetry axis of the top. A semiclassical expression for this T matrix is derived by assuming large values of orbital and rotational angular momentum quantum numbers

Mineralogy and composition of Archean Crust, Greenland: A pilot study

The Portable Instant Display and Analysis Spectrometer (PIDAS) was taken to southwestern Greenland to investigate in situ the potential application of AVIRIS to estimate the mineralogy and composition of rocks exposed in Archean terranes. The goal was to determine the feasibility of using a high spectral resolution scanner to find and study pristine rocks, those that have not been altered by subsequent deformation and metamorphism. The application of AVIRIS data to the problems in Greenland is logical. However, before a costly deployment of the U-2 aircraft to Greenland is proposed, this study was undertaken to acquire the spectral data necessary to verify that mineralogical mapping in the environmental conditions found there is possible. Although field conditions were far from favorable, all of the major objectives of the study were addressed. One of the major concerns was that lichens would obscure the rock surfaces. It was found that the spectral signature of the lichens was distinct from the underlying rocks. Thus, a spectrum of a rock outcrop, with its partial cover of lichens, can be un-mixed into rock and lichen components. The data acquired during the course of this study supports the conclusion that areas of pristine Archean crust can be differentiated from that which has experienced low grade alteration associated with Proterizoic faulting

Multidisciplinary research in space sciences and engineering with emphasis on theoretical chemistry

A broad program is reported of research in theoretical chemistry, particularly in molecular quantum and statistical mechanics, directed toward determination of the physical and chemical properties of materials, relation of these macroscopic properties to properties of individual molecules, and determination of the structure and properties of the individual molecules. Abstracts are presented for each research project conducted during the course of the program

An experimental investigation of the flap-lag stability of a hingeless rotor with comparable levels of hub and blade stiffness in hovering flight

An experimental investigation of the flap-lag stability of a hingeless rotor in hovering flight is presented and discussed. The rotor blade and hub configuration were selected such that the hub and blade had comparable levels of bending stiffness. Experimental measurements of the lag damping were made for various values of rotor rotational speed and blade pitch angle. Specifically at a blade pitch angle of 8 deg at three-quarters radius, the lag damping was determined over a range of rotational speeds from 200 RPM to 320 RPM and also over a range of blade pitch angles from 0 deg to 8 deg

Crop notes, 1896.

The winter of 1895-96 was unusually favorable for winter wheat and rye in this locality. The Turkish red wheat grown on the station grounds was in a more promising condition last spring at the opening of the season than any winter wheat that has been grown here during the past six years, though the conditions later were not as favorable and the yield not as large as in 1895

Experimental crop notes for 1894.

Since interest in winter wheat growing has revived in some sections of Iowa considerable merit has been claimed for the press drill over other grain drills and other methods of seeding. The Hoosier Press Drill Co., of Richmond, Ind., furnished the Iowa Experiment Station a drill free of charge, and we deemed it of interest to test its value for sowing winter wheat. Accordingly, on October 2, 1893, a small piece of ground, that had grown a crop of oats and vetches, was plowed to a depth of five inches and disced and harrowed thoroughly, and one-half of the piece sown with Turkish Red winter wheat with the Hoosier press drill, and the remainder with the same variety of wheat, at the same rate per acre, with a common grain drill. The principal point of difference in these machines is that the press drill has runners like a corn planter, that may be forced down to a depth of four or five inches,\u27and each runner is followed by a narrow wheel that firms the earth over the grain and leaves the soil between the rows standing up in ridges, by reason of which snow falling upon the field during winter lodges first in these tracks and protects the plants. The common drill also leaves the ground ridged, but does not press the soil over the seed, and the ridges are less marked. The soil of both plats was uniform, and all conditions were the same except the method of seeding. The depth of seeding was about four inches on each plat. The crop came on well, both plats coming up about the same time and going through the winter in similar condition. But little if any difference was noticed in the early stages of growth. Some difference was noticeable through May and June, but it was not until the wheat was in shock that any marked contrast was apparent. Then it was clear that the press drill plat had the heavier crop, though the stand was good on each. Both pieces ripened at the same time, and were harvested July 19th and handled alike. When threshed the press drill plat, containing 85 square rods, gave 25 bushels and 30 pounds of wheat that tested 61 1/2 pounds to the bushel; and the common drill plat of the same area gave 16 bushels that made the same test. The first was at the rate of 48 bushels per acre and the second 30 bushels, a difference of 18 bushels per acre in favor of the press drill. In hauling the grain a mile and a half to the threshing machine one load from the press drill plat fell off and in the extra handling some grain shattered out, but not enough to make any material difference, though whatever it was came from the heavier yield. The test in its details and execution was satisfactorily conducted, and the comparison a fair one so far as could be determined by a single trial, and the result is given as such for what immediate service it may be to those interested ; though a comparison of this kind needs to be repeated several times, and under varying conditions, in order to safely establish conclusions

Feeding cottonseed meal to dairy cows.

The extensive introduction of cottonseed meal into this state during the period of high priced grain prevailing in the early part of the past year led to many inquiries at this station as to how much of the product could be safely and judiciously fed to domestic animals. We are now feeding cottonseed meal to fattening cattle, in supplementing a corn ration, a t the rate of 31/2 pounds per head daily with entirely safe and satisfactory results. We have also in like manner fed as high as seven pounds per head daily without injury, though the economy of feeding as heavily as this is doubtful. The result of feeding cottonseed meal to hogs has been published in bulletin No. 28 and this experiment was conducted to determine the effect of cottonseed meal upon the flavor, and other qualities, of butter when fed to dairy cows

Cottonseed meal to hogs.

Cotton-seed meal was quite extensively introduced as a stock food in the northern states last winter by reason of its heavy production in the southern states and the severe drouth prevailing in the corn belt in 1894, and consequent high price of corn and other grain feeds. The introduction of this feed brought the station many inquiries concerning the feeding value of cotton-seed meal and the practicability of adopting it in feeding rations. We have fed it to the extent of six and seven pounds per day to dairy cows and fattening cattle with good results and no apparent injury. This work is still in progress and will be reported in bulletin 29, soon to be issued, and the present report will be confined to the results of feeding cottonseed-meal to hogs. In February of this year the writer purchased of a neighboring farmer a thrifty, even lot of fifteen Poland China shotes weighing 1480 pounds. They were bred and reared alike and selected from a bunch of twenty-five, and furnished a desirable lot for experimentation. In order to detect any possible difference due to individuality, the fifteen shotes were on February 23rd, divided into five lots of three each and fed alike for two weeks on uniform rations of corn and cob meal and butter-milk, and weighed weekly. This period gave again of 61, 54, 46, 50, and 54 pounds respectively per lot in fourteen days, and the individual record showed that every shote was gaining and doing well in all respects. The feed given in the preliminary period consisted of 4 pounds each of corn and cob meal and four pounds of butter-milk per head daily

Calf feeding

The advent of the separator that takes all the fat out of milk brings into discussion the best methods of supplementing the fat extracted, and what grains will most effectually do it. In Bulletin No. 14 this station reported an experiment in feeding full new milk against skim milk, to which flax meal was added. In that experiment the milk was skimmed after 12 hours setting, after which it still contained considerable fat, varying from 1.10 to 1.35 per cent. The results indicated that skim milk and ground flax compared favorably with full new milk, in raising calves. This experiment deals with separated milk, that had all the fat taken out. The plan of the experiment was to select six heifer calves, three short horns, and three Holsteins, as near alike in age, weight, and condition, as possible