Silo construction

The value of the silo as a means of utilizing almost the entire corn plant and producing valuable feed has been thoroly demonstrated. Silage is an economical and desirable feed and it is highly desirable that the use of the silo be more generally adopted. The construction of silos has been for many years one of the principal lines of investigation followed by the Agricultural Engineering Section of the Iowa Agricultural Experiment Station. Results have been published in the following bulletins: No. 100, July, 1908, revised and republished July, 1909; No. 117, June, 1910, by J. B. Davidson and M. L. King, and No. 141, June, 1913, by J. B. Davidson. This new bulletin No. 189 is a revision of Bulletin No. 141. The Agricultural Engineering Section does not recommend any one type of silo above all others. It has been demonstrated by experience that a number of different types of silos will each give satisfactory service if properly constructed. It is well worth while for the silo builder to study the types and details of construction which will insure a reasonably permanent structure

Curing Hay in the Barn

Making hay in the barn isn’t exactly new. But only a few farmers have equipment for doing it. This method of making hay—curing it in the mow—was tried more than 10 years ago by the Tennessee Valley Authority

Dryer Corn Means Safer Storage

Today\u27s farmer has dozens of corn varieties to choose from. Unfortunately, most of the highest-yielding varieties need a long growing season. That means you may be taking some risk in choosing a high-yielding variety. If your planting is delayed by wet weather, if the summer is cool or if there\u27s not good drying weather in the fall, you may have the problem of storing corn that\u27s not dry enough for ordinary crib storage

We Have Some Soft Corn

Many Iowa farms have a lot of soft corn, and most farms have corn with high moisture content to be taken care of this fall. The wet spring and the necessity of replanting many fields made this unavoidable. The problem now is how best to handle it

Applications of Commercial Heat Pump Water Heaters in Hot, Humid Climates

Heat pump water heaters can provide high-efficiency water heating and supplemental space cooling and dehumidification in commercial buildings throughout the United States. They are particularly attractive in hot, humid areas where cooling loads are high and the cooling season is long. Because commercial kitchens and laundry facilities have simultaneous water heating and cooling needs, they are excellent applications for heat pump water heaters. Typical heat pump water heaters (HPWHs) operate at an annual coefficient of performance (COP) of approximately 3.0 for water heating alone. Space conditioning benefits of about 0.67 Btu are delivered at no additional cost for each Btu of water heating output. In situations in which this cooling output is valued, the dual thermal outputs for heating and cooling make heat pump water heaters particularly attractive. The comfort value of added cooling in overheated facilities and the resulting increase in employee and customer satisfaction are frequently cited as additional benefits. This paper describes currently available heat pump water heating equipment and offers guidelines for successful applications in commercial facilities. The results of field test programs involving more than 100 units in Alabama, Georgia, Mississippi, Tennessee, South Carolina, and other areas are incorporated. Initial conclusions are drawn from a reliability database, and interviews with utility applications specialists and manufacturers are discussed. Design tools are reviewed, including a new comprehensive computer simulation model. Emphasis is placed on identifying sound candidates for installations and on application and design considerations. A brief survey is provided of environmental implications of heat pump water heaters and new developments in heat pump water heater equipment

Electron Wave Function in Armchair Graphene Nanoribbons

By using analytical solution of a tight-binding model for armchair nanoribbons, it is confirmed that the solution represents the standing wave formed by intervalley scattering and that pseudospin is invariant under the scattering. The phase space of armchair nanoribbon which includes a single Dirac singularity is specified. By examining the effects of boundary perturbations on the wave function, we suggest that the existance of a strong boundary potential is inconsistent with the observation in a recent scanning tunneling microscopy. Some of the possible electron-density superstructure patterns near a step armchair edge located on top of graphite are presented. It is demonstrated that a selection rule for the G band in Raman spectroscopy can be most easily reproduced with the analytical solution.Comment: 7 pages, 4 figure

The Nebraska Tractor Law and Rules for Official Tractor Tests

The Nebraska Tractor Law, which became effective July 15, 1919, was enacted to encourage the manufacture and sale of improved types of tractors and to contribute to a more successful use of the tractor for farming. It was thought that the best method of accomplishing these objects would be to require a tractor of each model sold in the State to be tested at the State University and to have the results of these tests made public. These tests will give reliable information on the power, capacity and fuel consumption of each tractor and also some information on endurance. The results of the tests will be useful to farmers and dealers in making selection of tractors. Manufacturers also will no doubt find that the results of the tests are of some value to their engineering and sales departments

Farmers' bulletin (United States. Dept. of Agriculture)

Describes how to build corn cribs to dry and store ear corn on the farm