119,002 research outputs found
Dynamic modeling and sensitivity analysis of perlite grain expansion in a vertical electrical furnace
Hydroponics or Soilless Culture
Historically, hydroponics is not a new field; plant physiologists have known and used it for some 100 years. Inevitably, some enthusiasts got carried away.Claims were made of enormous potential yields; skyscraper tops were said to be capable of producing enough food for all of their occupants; and closets, basements, garages, etc. were wishfully converted into fields for hydroponic culture. Numerous publications on the subject appeared during this period. Basic requirements for hydropinc techniques are given along with examples of where soilless culture has been used commercially
Continuous coal processing method
A coal pump is provided in which solid coal is heated in the barrel of an extruder under pressure to a temperature at which the coal assumes plastic properties. The coal is continuously extruded, without static zones, using, for example, screw extrusion preferably without venting through a reduced diameter die to form a dispersed spray. As a result, the dispersed coal may be continuously injected into vessels or combustors at any pressure up to the maximum pressure developed in the extrusion device. The coal may be premixed with other materials such as desulfurization aids or reducible metal ores so that reactions occur, during or after conversion to its plastic state. Alternatively, the coal may be processed and caused to react after extrusion, through the die, with, for example, liquid oxidizers, whereby a coal reactor is provided
Panama Canal Twenty-fifth anniversary 1914 - Aug. 15 -1939
Leonard Carpenter Panama Canal Collection. Photographs: Views of Panama and the Canal. [Box 1] from the Special Collections & Area Studies Department, George A. Smathers Libraries, University of Florida.
Booklet dedication: Published under the direction of a committee appointed by Brigadier General Clarence S. Ridley,
Governor of The Panama Canal, to arrange suitable ceremonies, as authorized in Public
Resolution No.5, 76th Congress, approved March 28, 1939, to celebrate the twenty-fifth
anniversary of the opening of the Panama Canal to commerce. Prepared by Rufus Hardy,
Executive Department, The Panama Canal. (120 page document
Study to establish cost projections for production of Redox chemicals
A cost study of four proposed manufacturing processes for redox chemicals for the NASA REDOX Energy Storage System yielded favorable selling prices in the range 1.91/kg of chromic chloride, anhydrous basis, including ferrous chloride. The prices corresponded to specific energy storage costs from under 17/kWh. A refined and expanded cost analysis of the most favored process yielded a price estimate corresponding to a storage cost of $11/kWh. The findings supported the potential economic viability of the NASA REDOX system
Biotic Succession in a Douglas Fir Forest on Saddleback Mountain (Oregon Coast Range)
This grant proposal, submitted to the National Science Foundation in 1959 by Dr. Jane Claire Dirks-Edmunds, requested funding to continue an ecological study at Saddleback Mountain. Dirks-Edmunds requested $15,570.05 to fund weekly trips with students to the site in order to collect meteorological and synecological data on the forest; she anticipated the project would last two years.
Dr. Dirks-Edmunds graduated from Linfield College in 1937; she returned to teach in the Biology department at Linfield from 1941-1974
Transportation in McMinnville 100 Years Ago
Our project presents a historical view of transportation and its development in McMinnville in the 1910s, especially in 1912. McMinnville was incorporated as a town in 1876 and became a city in 1882. At the time, people still frequently rode horses (including stagecoaches), and the Yamhill River provided an early artery for pioneer travel and commerce. Then rails expanded in Oregon in the late 1800s and became a popular mode of transportation in the early 20th century. By the 1910s, horses, steamboats, rails, and cars were four major modes of transportation in McMinnville
- …
