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Articles 2911 - 2940 of 2941
Full-Text Articles in Engineering
Transport Processes In Random Arrays Of Cylinders. I. Thermal Conduction, Ashok S. Sangani, C. Yao
Transport Processes In Random Arrays Of Cylinders. I. Thermal Conduction, Ashok S. Sangani, C. Yao
Ashok S. Sangani
A numerical method is developed that takes into account the many particle interactions in a rigorous manner to determine the effective thermal conductivity of Km of a composite medium consisting of parallel circular cylinders of thermal conductivity ak suspended in a matrix of conductivity k. Numerical results for Km are presented for a wide rane of a and o, the area fraction of the cylinders, after averaging over several computer-generated random arrays of cylinders. The results obtained via this exact method are compared with those of various approximate analystical methods to assess their utility in predicting Km.
Heat Transfer (Holman), Dr Alireza Zolfaghari
Heat Transfer (Holman), Dr Alireza Zolfaghari
Dr Alireza Zolfaghari
No abstract provided.
Love, Niuniuniuiuniu21@163.Com Niuniuniuiuniu21@163.Com
Love, Niuniuniuiuniu21@163.Com Niuniuniuiuniu21@163.Com
niuniuniuiuniu21@163.com niuniuniuiuniu21@163.com
No abstract provided.
A Digital Tachometer For Measurement Of Low Speeds, Mukhtar Ahmad
A Digital Tachometer For Measurement Of Low Speeds, Mukhtar Ahmad
Mukhtar Ahmad
No abstract provided.
Regrowth And Yield Of Alfalfa As Influenced By Wheel Traffic, Burl D. Meek, Lyle M. Carter, Richard H. Garber, Eric A. Rechel, William R. Detar
Regrowth And Yield Of Alfalfa As Influenced By Wheel Traffic, Burl D. Meek, Lyle M. Carter, Richard H. Garber, Eric A. Rechel, William R. Detar
William R DeTar
Wheel traffic from equipment used to harvest alfalfa reduces yields because of crown damage and soil compaction. As much as 70% of the soil surface may receive wheel traffic during a single harvest.
Travel Time For Chemicals In An Irrigation System, William R. Detar
Travel Time For Chemicals In An Irrigation System, William R. Detar
William R DeTar
When a chemical is injected into an irrigation system, the length of time it takes to reach the end of the longest path can have a large effect on the uniformity of distribution of the chemical in the field. In trickle irrigation systems, the time to travel this path is also the minimum time before the end of the cycle at which system maintenance chemicals should be injected. In the case where wastewater is being applied to land through an irrigation system or where an injected chemical would cause damage to the piping if it were to remain in the …
Trickle Irrigation Vs. No-Irrigation Of Five Horticultural Crops In Pennsylvania, William R. Detar, David F. Kibler, D. W. Grenoble, R. Daniels, R. H. Cole
Trickle Irrigation Vs. No-Irrigation Of Five Horticultural Crops In Pennsylvania, William R. Detar, David F. Kibler, D. W. Grenoble, R. Daniels, R. H. Cole
William R DeTar
IN humid regions, the question of whether one should irrigate often overshadows problems such as selecting the proper system or scheduling procedure. To show whether it pays to irrigate by running irrigation experiments in the field is a long, expensive process. It would take perhaps five to ten years to determine significant relationships. The approach used in this project was to set up a computer model relating crop yields to weather data and moisture stress, and then verify the model at a few points using field experiments. This first report on the project includes only the field procedures and yields.
The Removal Of Fluorine From Wet Process Phosphoric Acid, Fathi Habashi
The Removal Of Fluorine From Wet Process Phosphoric Acid, Fathi Habashi
Fathi Habashi
Fluorine (and silicon) can be removed from technical phosphoric acid (30% P205) and recovered quantitatively as a by-product by adding a sodium or a potassium salt preferably the carbonate and boiling for a few minutes. The corresponding fluorosilicate precipitate, e.g. 2Na+ + SiF6- → Na2SiF6 can be separated by filtration. If this procedure is followed, no precipitation will take place in the evaporators during concentration of acid to 40% P2O5.
Ask For Information Retrieval: Part Ii. Results Of A Design Study, Robert N. Oddy, N J. Belkin, H M. Brooks
Ask For Information Retrieval: Part Ii. Results Of A Design Study, Robert N. Oddy, N J. Belkin, H M. Brooks
Robert Oddy
In 'ASK for Information Retrieval: Part P1, we discussed the theory and background to a design study for an information retrieval (IR) system based on the attempt to represent the anomalous states of knowledge (ASKs) underlying information needs. In Part 11, we report the methods and results of the design study, and our conclusions.
Ask For Information Retrieval: Part I. Background And Theory, Robert N. Oddy, N J. Belkin, H M. Brooks
Ask For Information Retrieval: Part I. Background And Theory, Robert N. Oddy, N J. Belkin, H M. Brooks
Robert Oddy
We report the results of a British Library Research and Development Department funded design study for an interactive information retrieval system which will determine structural representations of the anomalous states of knowledge (ASKs) underlying information needs, and attempt to resolve the anomalies through a variety of retrieval strategies performed on a database of documents represented in compatible structural formats. Part I discusses the background to the project and the theory underlying it, Part II (next issue) presents our methods, results and conclusions. Basic premises of the project were: that information needs are not in principle precisely specifiable; that it is …
Mineral Resources Of The Arab Countries, Fathi Habashi, Fouad Bassyouni
Mineral Resources Of The Arab Countries, Fathi Habashi, Fouad Bassyouni
Fathi Habashi
Thirty four colored maps showing location of mineral deposits in the Arab countries with brief description of the deposits and their geology.
Modified Graphical Determination Of Submain Size, William R. Detar
Modified Graphical Determination Of Submain Size, William R. Detar
William R DeTar
THE pressure distribution in a multiple-outlet tapered pipe descending a non-uniform slope was determined graphically by DeTar (1975). His procedure enabled one to select the proper pipe size and the location for changes in pipe size. A table of multipliers was a key element in the procedure. This new article presents a simplified method for obtaining these multipliers for a variety of pipe types and for any number of outlets. The procedure involves the use of the correction factor commonly used in sprinkler lateral design; a table of three correction factors is given.
Rate Of Intake And Stream Advance For Liquid Dairy Manure In Furrows, William R. Detar
Rate Of Intake And Stream Advance For Liquid Dairy Manure In Furrows, William R. Detar
William R DeTar
FIVE different concentrations of very dilute dairy manure were run down 18 furrows in a sandy loam soil at rates of 200, 400, and 600 mL/min. The resulting intake rates were related to the total solids concentration of the liquid manure and the permeability of the soil. An equation is presented that fits well all of the stream advance curves. An example design problem shows how to determine the proper length of furrow and the duration of each irrigation.
Trickle Irrigation In The Eastern United States, David R. Ross, C. W. Reynolds, R. A. Parsons, E. D. Markwardt, William R. Detar
Trickle Irrigation In The Eastern United States, David R. Ross, C. W. Reynolds, R. A. Parsons, E. D. Markwardt, William R. Detar
William R DeTar
A cooperative extension manual by the Northeast Regional Agricultural Engineering Service. Trickle or drip irrigation is a method of slowly applying small amounts of water to part of the plant root zone. Water is applied on a frequent, often daily, basis to prevent moisture stress in the plant by maintaining favorable moisture conditions. With adequate soil moisture, 25% of the root system of a fruit tree can supply enough water to prevent moisture stress. Trickle irrigation has been installed mainly in areas that are arid and have high labor costs. The system works well with water that is highly saline …
Infiltration Of Liquid Dairy Manure Into Soil, William R. Detar
Infiltration Of Liquid Dairy Manure Into Soil, William R. Detar
William R DeTar
BASIN infiltrometers and double-ring infiltrometers were used on the subsoil of four different soils to determine the infiltration rate of various concentrations of liquid dairy manure. Raw manure was diluted with water by ratios varying from 3:1 to 50:1. The liquid used for most of the tests did not contain the heavy fibers that tend to settle out immediately after mixing. Total solids, St, was the primary measure of concentration, and steady-state infiltration with water, Iw, was the indicator used for the type of soil. It was found that the infiltration rate was proportional to Iw^0.11st^-.67 at one week. All …
Hidrometalurjide Yeni, Fathi Habashi
Hidrometalurjide Yeni, Fathi Habashi
Fathi Habashi
Turkish translation of F. Habashi, “Recent Advances in Hydrometallurgy,” Proceedings International Mineral Processing Congress, Warsaw, 1979, edited by J. Laskowski, published by Elsevier, pp. 902–935
Information Retrieval Through Man-Machine Dialogue., Robert N. Oddy
Information Retrieval Through Man-Machine Dialogue., Robert N. Oddy
Robert Oddy
The purpose of this paper is to introduce a new method of information retrieval by man-machine interaction. The dialogue supported has more symmetry than most interactive computer systems in that the machine forms an image (rather as a man does) of the view of the human enquirer, without requiring him to ask a precise question, and responds with references according to its image. Initial tests with a prototype program indicate that a performance equal to that obtainable from a more conventional on-line retrieval system is possible without obliging the user to formulate his query.
Graphic Determination Of Sub-Main Pipe Size For Solid-Set Sprinkler Irrigation On Steep, Non-Uniform Slopes, William R. Detar
Graphic Determination Of Sub-Main Pipe Size For Solid-Set Sprinkler Irrigation On Steep, Non-Uniform Slopes, William R. Detar
William R DeTar
The selection of the proper pipe size for sub-mains on a solid-set sprinkler system can be a tedious operation for hillside systems, especially if the slopes are not uniform. A typical field situation is where a main across the upper end of the field feeds several sub-mains that descend a steep, irregular slope. These sub-mains feed short laterals that lead off to both sides at regular intervals. The system is fairly common for hillside groves of oranges or avocadoes, and is also used for orchards and vineyards on rolling land. The graphical method presented here is a simplified approach for …
Progress In Extractive Metallurgy, Volume 1. Review By G.N. Dobrokhotov, Fathi Habashi
Progress In Extractive Metallurgy, Volume 1. Review By G.N. Dobrokhotov, Fathi Habashi
Fathi Habashi
Review of the first volume of Progress in Extractive Metallurgy edited by Fathi Habashi and published by Gordon & Breach in New York in 1975. The review was written by Professor Dobrokhotov at the Leningrad Mining Institute.
Reference Retrieval Based On User Induced Dynamic Clustering., Robert N. Oddy
Reference Retrieval Based On User Induced Dynamic Clustering., Robert N. Oddy
Robert Oddy
The problem of mechanically retrieving references to documents, as a first step to fulfilling the information need of a researcher, is tackled through the design of an interactive computer program. A view of reference retrieval is presented which embraces the browsing activity. In fact, browsing is considered important and regarded as ubiquitous. Thus, for successful retrieval (in many circumstances), a device which permits conversation is needed. Approaches to automatic (delegated) retrieval are surveyed, as are on-line systems which support interaction. This type of interaction usually consists of iteration, under the user's control, in the query formulation process. A program has …
Progress In Extractive Metallurgy, Volume One, Fathi Habashi
Progress In Extractive Metallurgy, Volume One, Fathi Habashi
Fathi Habashi
Progress in Extractive Metallurgy is a new series planned to publish reviews and original research in extractive metallurgy and mineral dressing. Emphasis is on theoretical fields (chemical and physicochemical), unit processes, engineering problems, as well as historical aspects. OUT OF PRINT. Available only as Xerox copy from Métallurgie Extractive Québec
Uran In Phosphaten. Herkunft Und Industrielle Gewinnung, Fathi Habashi
Uran In Phosphaten. Herkunft Und Industrielle Gewinnung, Fathi Habashi
Fathi Habashi
Phosphate rock is the major source of phosphorus in nature. It exists mainly in the form of hydroxy and fluorapatite or a mixture of both. About 100 million tons of rock are treated annually mainly for the production of fertilizers and a minor amount is used in the detergent and food industries. Phosphate rock is of two types: Sedimentary, this represents about 90% of the world reserves and is characterized by containing about 100 ppm uranium and minor amounts of rare earths. An example of this type is in Florida, North Africa, and the Middle East. Igneous, this represents the …
Acoustically Forced Vibrations Of Greenhouse Tomato Blossoms To Induce Pollination., William R. Detar
Acoustically Forced Vibrations Of Greenhouse Tomato Blossoms To Induce Pollination., William R. Detar
William R DeTar
The production of tomatoes in the greenhouse requires a great deal of manual labor, one of the largest laborconsuming operations being pollination. Although tomatoes are considered selfpollinating (that is, the bloom containing both the male and female parts), if left to themselves, only about 30 percent of the blooms normally set fruit. Greenhouse growers have found that my mechanically agitating the bloom, a satisfactory set can usually be obtained. A study was initiated to investigate the effects of sound on the pollination of greenhouse tomatoes. The objective was to find the natural vibration frequency of the blossom and to determine …