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Due to the increase of the human world population, modern-day research is looking for new methods of protein exploitation. Therefore the authors conducted a joint research project with the goal to automate the breeding ofTenebrio molitor as a novel protein source. An important task is to monitor the size of larvae in order to control the rearing process. In this work, a suitable algorithm is presented to measure the size distribution of the population. It is a combination of classical image processing functions and a neural net to enhance the dataset for a more reliable result. The output can be used to determine the most efficient time for harvesting. First, a grayscale picture of the insects in one box is taken and binarised by a threshold algorithm. The connected objects in this image are separated by an irregular watershed algorithm that delivers separate segments of larvae. Not all single segments can be used for measuring the size distribution; therefore, an artificial neural network is used for a classification. In the end, the algorithm separates the segments given by the watershed and categorises them into four categories: good segments, medium segments, bad segments, and artefacts. The good segments have a recall rate of 91.4%. In the end, the identified segments can be used to establish a method for determining the size distribution and, thus, to document the growth of the larvae.
Abstract
Separation of Tenebrio molitor larvae from unwanted residues, like frass, feed or exuviae is a key process step for an industrial scale plant. One method to separate larvae from residues is using a zigzag air classifier. For designing and for an efficient operation of a zigzag air classifier, the terminal velocity is a key parameter to separate larvae from different residues with a high separation sensitivity. In this work, the terminal velocities of different larvae sizes are evaluated analytically, numerically and experimentally. For this, the sizes of 3 week to 12 week old larvae were used to calculate and simulate the terminal velocity. To validate the results, an experiment was carried out and compared with the analytical and numerical data. For this, a model for T. molitor larvae was designed to calculate the surface and volume of a larva to produce equivalent spheres with the same physical properties as a real larva. The results are showing similar curves with terminal velocities from 5 m/s for young larvae (3 weeks old) to 12 m/s for older larvae (12 weeks old). The deviations between each method are 1 m/s for smaller larvae and 1.5 m/s for bigger larvae. In further experiments and simulations, approaches with calculation methods for non-spherical particles are necessary to achieve results closer to reality due to the cylindrical shape of T. molitor larvae.
- M.A. van Bakel, H. Esen-Baur, Untersuchungen über den vogelmann-kult auf der Osterinsel, 1983, Franz Steiner Verlag GmbH, 399 pp. - Leen Boer, Bronislaw Malinowski, Malinowski in Mexico. The economics of a Mexican market system, edited and with an introduction by Susan Drucker-Brown, London: Routledge and Kegan Paul, 1982 (International Library of Anthropology)., Julio de la Fuente (eds.) - A.P. Borsboom, Betty Meehan, Shell bed to shell midden, Australian Institute of Aboriginal Studies, Canberra, 1982. - H.J.M. Claessen, Peter Geschiere, Village communities and the state. Changing relations among the Maka of Southeastern Cameroon since the colonial conquest. Monographs of the African Studies Centre, Leiden. London: Routledge and Kegan Paul Ltd. 1982. 512 pp. Appendices, index, bibliography, etc. - H.J.M. Claessen, Jukka Siikala, Cult and conflict in tropical Polynesia; A study of traditional religion, Christianity and Nativistic movements, Helsinki: Academia Scientiarum Fennica, 1982, 308 pp. Maps, figs., bibliography. - H.J.M. Claessen, Alain Testart, Les Chasseurs-Cueilleurs ou l’Origine des Inégalités, Mémoires de la Sociéte d’Ethnographie 26, Paris 1982. 254 pp., maps, bibliography and figures. - Walter Dostal, Frederik Barth, Sohar - Culture and society in an Omani town. Baltimore - London: The Johns Hopkins University Press, 1983, 264 pp., ill. - Benno Galjart, G.J. Kruyer, Bevrijdingswetenschap. Een partijdige visie op de Derde Wereld [Emancipatory Science. A partisan view of the Third World], Meppel: Boom, 1983. - Sjaak van der Geest, Christine Okali, Cocoa and kinship in Ghana: The matrilineal Akan of Ghana. London: Kegan Paul International (in association with the International African Institute), 1983. 179 pp., tables, index. - Serge Genest, Claude Tardits, Contribution de la recherche ethnologique à l’histoire des civilisations du Cameroun / The contribution of enthnological research to the history of Cameroun cultures. Paris, CNRS, 1981, two tomes, 597 pp. - Silvia W. de Groot, Sally Price, Co-wives and calabashes, Ann Arbor, The University of Michigan Press, 1984, 224 p., ill. - N.O. Kielstra, Gene R. Garthwaite, Khans and Shahs. A documentary analysis of the Bakhtiary in Iran, Cambridge University Press, Cambridge, 1983. 213 pp. - G.L. Koster, Jeff Opland, Xhosa oral poetry. Aspects of a black South African tradition, Cambridge Studies in oral and literate culture 7, Cambridge University Press, Cambridge , London, New York, New Rochelle, Melbourne, Sydney, 1983, XII + 303 pp. - Adam Kuper, Hans Medick, Interest and emotion: Essays on the study of family and kinship, Cambridge University Press, 1984., David Warren Sabean (eds.) - C.A. van Peursen, Peter Kloos, Antropologie als wetenschap. Coutinho, Muidenberg 1984 (204 p.). - Jerome Rousseau, Jeannine Koubi, Rambu solo’: “la fumée descend”. Le culte des morts chez les Toradja du Sud. Paris: Editions du CNRS, 1982. 530 pages, 3 maps, 73 pictures. - H.C.G. Schoenaker, Miklós Szalay, Ethnologie und Geschichte: zur Grundlegung einer ethnologischen geschichtsschreibung; mit beispielen aus der Geschichte der Khoi-San in Südafrika. Dietrich Reimer Verlag, Berlin 1983, 292 S. - F.J.M. Selier, Ghaus Ansari, Town-talk, the dynamics of urban anthropology, 170 pp., Leiden: E.J. Brill, 1983., Peter J.M. Nas (eds.) - A.A. Trouwborst, Serge Tcherkézoff, Le Roi Nyamwezi, la droite et la gauche. Revision comparative des classifications dualistes. Cambridge: Cambridge University Press, Paris:Éditions de la Maison des sciences de l’homme, 1983, 154 pp. - Pieter van der Velde, H. Boekraad, Te Elfder Ure 32: Verwantschap en produktiewijze, Jaargang 26 nummer 3 (maart 1983)., G. van den Brink, R. Raatgever (eds.) - E.Ch.L. van der Vliet, Sally Humphreys, The family, women and death. Comparative studies. London, Boston etc.: Routledge & Kegan Paul, 1983 (International Library of Anthropology). xiv + 210 pp. - W.F. Wertheim, T. Svensson, Indonesia and Malaysia. Scandinavian Studies in Contemporary Society. Scandinavian Institute of Asian Studies: Studies on Asian Topics no. 5. London and Malmö: Curzon Press, 1983, 282 pp., P. Sørensen (eds.) - H.O. Willems, Detlef Franke, Altägyptische verwandtschaftsbezeichnungen im Mittleren Reich, Hamburg, Verlag Born GmbH, 1983.
Unter dem Motto »Nein zur Nachrüstung« kamen im Herbst 1983 mehr als eine Million Menschen zusammen, um gegen den NATO-Doppelbeschluss und die Stationierung von Cruise Missiles und Pershing II-Raketen in der Bundesrepublik zu demonstrieren. Das Thema beherrschte wie kein anderes die politische und gesellschaftliche Debatte dieser Zeit. Welche Dynamiken entwickelte der Konflikt? Wie waren die Positionen beider Lager? Wer waren die Protagonisten des politischen Establishments einerseits und der Friedensbewegung andererseits? Abschließend steht die Frage, welche Folgen die Kon-troverse um die Nachrüstung für die bundesdeutsche Gesellschaft und für das Ende des Kalten Kriegs hatte. Ein Buch für
zeithistorisch Interessierte und alle, die damals dabei waren!
Unter dem Motto »Nein zur Nachrüstung« kamen im Herbst 1983 mehr als eine Million Menschen zusammen, um gegen den NATO-Doppelbeschluss und die Stationierung von Cruise Missiles und Pershing II-Raketen in der Bundesrepublik zu demonstrieren. Das Thema beherrschte wie kein anderes die politische und gesellschaftliche Debatte dieser Zeit. Welche Dynamiken entwickelte der Konflikt? Wie waren die Positionen beider Lager? Wer waren die Protagonisten des politischen Establishments einerseits und der Friedensbewegung andererseits? Abschließend steht die Frage, welche Folgen die Kon-troverse um die Nachrüstung für die bundesdeutsche Gesellschaft und für das Ende des Kalten Kriegs hatte. Ein Buch für
zeithistorisch Interessierte und alle, die damals dabei waren!