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367 results on '"Hemming, J."'

29. Evolutionary implications of permanent odd polyploidy in the stable sexual, pentaploid of Rosa canina L

Author

Lim, K.Y., Werlemark, G., Matyasek, R., Bringloe, J.B., Sieber, V., Mokadem, H. El, Meynet, J., Hemming, J., Leitch, A.R., and Roberts, A.V.

Subjects
Chromosomes -- Research, Haploidy -- Research, Allopolyploid -- Research, Biological sciences
Abstract

The pollen and ovular parents in Rosa canina contribute seven and 28 chromosomes respectively to the zygote. The data indicate only one pair of truly homologous genomes in R. canina and the 21 unpaired chromosomes probably remain as univalents through multiple generations and do not recombine.

Published
2005

49. Field Performance Evaluation Method for a Machine Vision Based Intra Row Hoeing Machine

Author

Hemming, J., de Jong, Hermen, Struik, Lauwrens, van Meer, Jasper, and van Henten, E.J.

Subjects
Life Science, Farm Technology, GTB Teelt & Gewasfysiologie A, Agrarische Bedrijfstechnologie, PE&RC
Abstract

Wageningen University and Research developed a machine vision based intra row hoeing machine in collaboration with Steketee, a manufacturer of agricultural machinery. Although the machine is used in agricultural practice for several years already there is still a lack of an experimental method to evaluate the field performance of such a device. Reliable, quantitative information about the performance of the machine in the field is therefore not known and the effect of variations in field conditions and machine settings on the performance were not previously researched. The relative number of crop plants damaged by the machine and the relative amount of soil around the crop plants not hoed were used as criteria to assess the field performance. The performance was measured both manually on the field and with the help of sensors by logging the actuation response of the hoeing elements. In the field trial four treatments were combined: 1) the relative number of lettuce plants, 2) the weed density on the field, 3) the driving speed during hoeing, and 4) the moment of hoeing. Each possible combination of treatments was repeated three times. It was concluded that the developed method was suitable to determine statistically significant differences in the hoeing results for the applied treatments. No difference in the machine performance was found for different numbers of missing crop plants in a plant row. The machine performance decreased in terms of the relative number of damaged crop plants in case of high weed density treatments and decreased in terms of the relative number of not hoed intra row spaces in case of high speed treatments.

Published
2018

50. Trimbot2020 : An outdoor robot for automatic gardening

Author

Nicola Strisciuglio, Tylecek, R., Blaich, M., Petkov, N., Biber, P., Hemming, J., Henten, E., Sattler, T., Pollefeys, M., Gevers, T., Brox, T., and Fisher, R. B.

Subjects
FOS: Computer and information sciences, Computer Science - Robotics, WPR GTB AgroFoodRobotics, Life Science, Farm Technology, GTB Teelt & Gewasfysiologie A, Agrarische Bedrijfstechnologie, PE&RC, Robotics (cs.RO)
Abstract

Robots are increasingly present in modern industry and also in everyday life. Their applications range from health-related situations, for assistance to elderly people or in surgical operations, to automatic and driver-less vehicles (on wheels or flying) or for driving assistance. Recently, an interest towards robotics applied in agriculture and gardening has arisen, with applications to automatic seeding and cropping or to plant disease control, etc. Autonomous lawn mowers are succesful market applications of gardening robotics. In this paper, we present a novel robot that is developed within the TrimBot2020 project, funded by the EU H2020 program. The project aims at prototyping the first outdoor robot for automatic bush trimming and rose pruning., Accepted for publication at International Sympsium on Robotics 2018

Published
2018

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