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Robotrak: calibration on a shoestring (1994)

Owens, John

Bradford : Emerald

Industrial robot 21 (1994), S. 10-13

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ISSN: 0143-991X

Source: Emerald Fulltext Archive Database 1994-2005

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Examines the problem of the robot and fixture calibration from theperspective of simulation and off-line programming. Looks at the twobasic methods of measuring robot position—optical systems andcable-driven systems—and describes examples of both of thesemethods. The Workspace PC-based robot simulation system and theRoboTrak three-cable measuring system for calibration are used asexamples and compared with other commercial systems, and a calibration casestudy is presented. Concludes that if the accuracy required by a robotapplication of the order of 1 mm and the robot program is to be generated byan off-line software package, then it is necessary to calibrate therobot first.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1108/EUM0000000004167

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Seasonal occurrence of potential ice-nucleating bacteria on Douglas fir foliage and seed cones (1990)

Colangeli, Anna M. ; McAuley, Leslie ; Owens, John N.

Springer

New forests 4 (1990), S. 55-61

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ISSN: 1573-5095

Keywords: Pseudotsuga menziesii ; cone abortion ; seed orchard ; pollination ; ice nucleation ; bacteria

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract Total bacteria and fluorescent Pseudomonas populations were monitored on buds, conclets and foliage in a Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) seed orchard in April 1986 and between October 1986 and May 1987, over periods that spanned two pollination seasons. Seasonal variation in bacterial numbers was observed, with the highest levels occurring in the late winter and early spring. Bacterial populations active in ice nucleation were found. Bacterial numbers during pollination were higher in 1986 than in 1987. Conclet abortion at pollination was also higher in 1986 (55%) than in 1987 (11%). A relationship may exist between bacterial populations and conelet abortion at pollination.