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Full-Text Articles in Engineering
Micro And Macromorphology Of Recycled Fiber And Wood, Douglas D. Stokke
Micro And Macromorphology Of Recycled Fiber And Wood, Douglas D. Stokke
Douglas D. Stokke
Wood is a major industrial raw material, with U.S. consumption approaching that of aluminum, plastics, cement, and steel combined. Partially as a result of the magnitude of wood and wood products in use, these products constitute a substantial portion of the solid waste stream. In order to reduce the amount of wood and wood fiber disposed in landfills, efforts to recycle these materials into useful products such as structural composites are needed. The success of such conversion depends in part on knowledge of the morphological characteristics of various sources of secondary wood and wood fibers, and the influence of wood …
Feeding Patterns Of Growing Pigs At Warm Constant And Cyclic Temperatures, Hongwei Xin, James A. Deshazer
Feeding Patterns Of Growing Pigs At Warm Constant And Cyclic Temperatures, Hongwei Xin, James A. Deshazer
Hongwei Xin
Feeding behavior of ad libitum-fed^ 39-kg, crossbred gilts was investigated under mean ambient temperatures of 30.8° C with 0, 7, and 16.6° C cycles. Average meal size, 160 to 170 g/pig; meal duration, 13.3 to 14.3 min; and ingestion rate, 12.2 g/min-pig did not appear to be influenced by the temperature conditions. However, meal frequency, 9 to 11 per day, tended to be reduced by elevated hours of exposure to high temperatures. Consequently daily feed intake of the pigs was signiflcantly less in the 16.6° C cycle treatment than in the 0 or 7° C cycle treatments (P<0.01). Feed consumed during the lighting period (0600 h to 2100 h) accounted for 75%, 61%, and 37% of daily feed intake for the 0, 7, and 16.6° C cycle treatments, respectively. Pigs under the 0° C cycle had most feeding activities in the afternoon and evening (55% of daily feed intake). In contrast, pigs under the 16.6° C cycle had most feeding events at night and early morning (91 % of daily feed intake).
Responses Of Pre-Fasted Growing Turkeys To Acute Heat Exposure, Hongwei Xin, James A. Deshazer, Mary M. Beck
Responses Of Pre-Fasted Growing Turkeys To Acute Heat Exposure, Hongwei Xin, James A. Deshazer, Mary M. Beck
Hongwei Xin
Nicholas turkeys at the age of 15 to 16 weeks were fasted for 24 hours in a moderate environment and then subjected to acute heat exposures of various dry-bulb and wet-bulb temperatures (T^u, and T^jj). Total feed intake was not influenced by T^^ of 32*' C, 36"* C or 40° C (P > 0.10), although differences existed in dynamic feeding profiles. Total heat production rate (THP) varied quadratically with T^^, and respiratory quotient (RQ) decreased linearly with T^u,. The lower RQ values at the higher T^i^ levels may have resulted from reduced feed assimilation. No differences were detected on feed intake, …
Object-Oriented Methodology For Analyzing And Allocating Resources For Field Operations, Steven A. Freeman, A. Dale Whittaker
Object-Oriented Methodology For Analyzing And Allocating Resources For Field Operations, Steven A. Freeman, A. Dale Whittaker
Steven A. Freeman
An object-oriented methodology for machinery management was developed by combining knowledge system techniques with conventional problem solving techniques. The methodology developed here, if incorporated into a machinery management tool, provides the farmer with the ability to evaluate the physical feasibility of an overall farm plan (regarding field operations) being considered for the future and to identify possible solutions when the farmer is unable to complete this overall farm plan using current resources. The developed methodology also provides the farmer with the ability to assess the progress being made toward completion of the defined calendar as a result of changes in …
Effects Of Hurricane Hugo On Agricultural Structures, Jay D. Harmon, George F. Grandle, Clyde L. Barth
Effects Of Hurricane Hugo On Agricultural Structures, Jay D. Harmon, George F. Grandle, Clyde L. Barth
Jay D. Harmon
A tour of damage to agricultural structures by hurricane Hugo was conducted. Empty grain bins which exhibited improper anchorage tended to fail. Post-frame buildings that were improperly anchored, braced or fastened failed, while others that were designed and constructed using sound engineering practices generally withstood hurricane winds.