Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Development of a customer-specific broiler welfare assessment programme
Jong, I.C. de; Hofstra, Gerben ; Hamming, Jan Jaap - \ 2017
In: Proceedings of the 7th International Conference on the Assessment of Animal Welfare at Farm and Group level. - Wageningen : Wageningen Academic Publishers - ISBN 9789086863143 - p. 176 - 176.
Droogzetten op kwartierniveau bespaart antibiotica
Wemmenhove, H. ; Kuijt, A. ; Hamming, F. - \ 2013
V-focus 10 (2013)5. - ISSN 1574-1575 - p. 46 - 47.
melkveehouderij - melkkoeien - gustperiode - antibiotica - dosering - celgetal - melkklieren - uiers - dairy farming - dairy cows - dry period - antibiotics - dosage - somatic cell count - mammary glands - udders
Naast het selectief droogzetten op koeniveau is er ook onderzoek gedaan naar selectief droogzetten op kwartierniveau. Door alleen kwartieren met een laag celgetal droog te zetten zonder antibiotica, is in deze pilot een besparing van 30 procent op droogzetpreperaten gerealiseerd zonder dat dit leidde tot het ontstaan van nieuwe mastitisgevallen tijdens de droogstand en in de eerste twee weken na afkalven. Voorwaarde is wel dat het koecelgetal op kwartierniveau kan worden gevolgd.
Did the pile driving during the construction of the Offshore Wind Farm Egmond aan Zee, the Netherlands, imapct local seabirds?
Leopold, M.F. ; Camphuysen, C.J. - \ 2007
Texel : IMARES Texel (Report / Wageningen IMARES nr. C062/07) - 26
zeevogels - ecologische verstoring - constructie - bouwtechnologie - windmolens - geluidshinder - voedingsgedrag - voedingsgewoonten - noordzee - nadelige gevolgen - sea birds - ecological disturbance - construction - construction technology - windmills - noise pollution - feeding behaviour - feeding habits - north sea - adverse effects
In this study, possible effects on sensitive seabirds are considered. Bird species most likely to be vulnerable to underwater sound are those that forage by diving after fish of shellfish. Diving birds that may occur in relatively high densities at the OWEZ location include auks, and possibly divers and seaduck. Terns, that feed by shallow dives are considered less vulnerable and mostly occur closer to the mainland coast. Several gull species may occur in the area in high densities, but they feed at the surface only, and are considered the least vulnerable. Pile driving took place from 17 April to 28 July 2007. The potentially vulnerable divers, seaduck and auks had largely left the area by the time the pile driving started. Migration commenced early in 2006 and any birds still left in the area by mid-April would have been scared away by the shipping activities long before actual pile driving started. Further mitigation of possible effects on sensitive seabirds included a ramp-up procedure that ensured that full hamming power was only administered after a period of low-energy blows that were unlikely to cause lethal effects on any birds still present. Furthermore, an underwater pinger, aimed at scaring off marine mammals, was put into operation 3-4 hours before pile driving started. Visual observations before and during three pile driving sessions failed to detect any of the seabirds deemed sensitive to pile driving noise in the vicinity of the construction work. Birds that did fly by the construction site (mainly gulls and terns) did not show a noticeable reaction to the activities. It is therefore concluded that effects of underwater noise on seabirds, though potentially detrimental, were negligible during construction of OWEZ. This was due to fortunate timing of the work and to appropriate mitigation measures.
The Variety of An Assortment : An Extension to the Attribute-Based Approach
Herpen, H.W.I. van; Pieters, F.G.M. - \ 2002
Marketing Science 21 (2002)3. - ISSN 0732-2399 - p. 331 - 341.
In recent years, interest in category management has surged, and as a consequence, large retailers now systematically review their product assortments. Variety is a key property of assortments. Assortment variety can determine consumers' store choice and is only gaining in importance with today's increasing numbers of product offerings. To support retailers in managing their assortments, insight is needed into the influence of assortment composition on consumers' variety perceptions, and appropriate measures of assortment variety are required. This paper aims to extend the assortment variety model recently proposed by Hoch et al. (1999) in Marketing Science. It conceptualizes assortment variety from an attribute-based perspective and compares this with the product-based approach of Hoch, Bradlow, and Wansink (HBW). The attribute-based approach offers an alternative viewpoint for assortment variety. Attribute- and product-based approaches reflect basic conceptualizations of assortment variety that assume substantially different perception processes: a consumer comparing products one-by-one versus a consumer examining attributes across products in the assortment. While the product-based approach focuses on the dissimilarity between product pairs in an assortment, the attribute-based approach that we propose focuses on the marginal and joint distributions of the attributes. We conjecture and aim to show that an attribute-based approach suffices to predict consumers' perceptions of assortment variety. In operationalizing the attribute-based approach, two measures of assortment variety are described and compared to product-based measures. These two measures relate to the dispersion of attribute levels, e.g., if all products have the same color or different colors, and the dissociation between attributes, e.g., if product color and size are unrelated. The ability of product-based and attributed-based measures to predict consumers' perceptions of assortment variety is assessed. The product-based measures (Hamming) tap the dissimilarity of products in an assortment across attributes. The attribute-based measures tap the dispersion of attribute levels across products (Entropy) and the dissociation between product attributes (1-Lambda) in an assortment. In two studies, we examine the correlations between these measures in a well-behaved environment (study 1) and the predictive validity of the measures for perceived variety in a consumer experiment (study 2). Study 1, using synthetic data, shows that the attribute-based measures tap specific aspects of assortment variety and that the attribute-based measures are less sensitive to the size of assortments than product-based measures are. Whereas HBW focus on assortments of equal size, study 1 indicates that an extension to assortments of unequal size results in summed Hamming measures that correlate highly with assortment size. The latter is important when assortments of different size are compared. Next, we examine how well the measures capture consumers' perception of variety. Study 2, a consumer experiment, shows that the attribute-based measures account best for consumers' perceptions of variety. Attribute-based measures significantly add to the prediction of consumers' perceptions of variety, over and above the product-based measures, while the reverse is not the case. Interestingly, this study also indicates that assortment size may not be a good proxy for perceived assortment variety. The findings illustrate the value of an attribute-based conceptualization of assortment variety, since these measures (1) correlate only moderately with assortment size and (2) suffice to predict consumers' perceptions of assortment variety. In the final section we briefly discuss how attribute-based and product-based measures can be used in assortment management, and when product-and attribute-based approaches may predict consumers' variety perceptions. We discuss how an attribute-based approach can identify which attribute levels and attribute combinations influence consumers' perceptions of variety most, while a product-based approach can identify influential products. Both approaches have applications in specific situations. For instance, an attribute-based approach can identify influential attributes in an ordered, simultaneous presentation of products, while a product-based approach can assess the impact of sequential presentations of products better. In addition, we indicate how the random-intercept model estimated in study 2 can be further extended to capture the influence of, e.g., consumer characteristics.
Primary rice marketing in North-West Sierra Leone : market and non-market transactions
Tilburg, A. van; Hamming, I. - \ 1999
In: Agricultural Marketing in Tropical Africa / van der Laan, H.L., Dijkstra, T., van Tilburg, A., - p. 131 - 152.
Bodemkaart van Nederland, schaal 1 : 50 000; toelichting bij het herziene kaartblad 32 Oost-Amersfoort
Loo, H. van het - \ 1997
Wageningen : SC-DLO - ISBN 9789032702663 - 10 p.
soil surveys - maps - netherlands - veluwe - gelderland - gelderse vallei - eemland
Maize marketing in Ghana: transaction costs, margins and price integration.
Hamming, I. ; Fosu, K.Y. ; Heerink, N. ; Nyanteng, V.K. ; Tilburg, A. van - \ 1996
S.n. - 67
economische ontwikkeling - maïs - marketing - kosten - handel - markten - ghana - economic development - maize - costs - trade - markets
Bodemkaart van Nederland 1:50.000 : toelichting bij de kaartbladen 42 West en 42 Oost Zierikzee, 47/48 West Cadzand - Middelburg
Pleijter, G. ; Wallenburg, C. van; Steur, G.G.L. ; Heijink, W. ; Bakker, H. de; Boersma, O.H. ; Hamming, C. - \ 1994
Wageningen : DLO-Staring Centrum - 166
bodemkarteringen - kaarten - nederland - zeeland - soil surveys - maps - netherlands
Bodemkaart van Nederland schaal 1 : 50000 : toelichting bij de herziene kaartbladen 59 Peer en 60 West en Oost - Sittard
Damoiseaux, J.H. ; Rosing, H. ; Steur, G.G.L. ; Heijink, W. ; Bakker, H. de; Boersma, O.H. ; Hamming, C. - \ 1993
Wageningen : DLO-Staring Centrum - 11
bodemkarteringen - kaarten - nederland - limburg - soil surveys - maps - netherlands
Bodemkaart van Nederland 1 : 50.000 : toelichting bij kaartblad 24 - 25 West, Zandvoort - Amsterdam
Vos, G.A. ; Steur, G.G.L. ; Heijink, W. ; Bakker, H. de; Boersma, O.H. ; Hamming, C. - \ 1992
Wageningen : DLO-Staring Centrum - 158
bodemkarteringen - kaarten - nederland - noord-holland - soil surveys - maps - netherlands
Bodemkaart van Nederland 1:50.000 : toelichting bij kaartblad 28 oost - 29, Almelo - Denekamp
Ebbers, G. ; Loo, H. van het; Steur, G.G.L. ; Heijink, W. ; Bakker, H. de; Boersma, O.H. ; Hamming, C. - \ 1992
Wageningen : SC-DLO - 152
bodemkarteringen - kaarten - nederland - overijssel - twente - soil surveys - maps - netherlands
Bodemkaart van Nederland schaal 1 : 50.000 : toelichting bij kaartblad 12 West Assen
Kuijer, P.C. ; Steur, G.G.L. ; Heijink, W. ; Bakker, H. de; Boersma, O.H. ; Hamming, C. - \ 1991
Wageningen : SC-DLO - 142
bodemkarteringen - kaarten - nederland - drenthe - soil surveys - maps - netherlands
Bodemkaart van Nederland, schaal 1:50000 : algemene begrippen en indelingen
Steur, G.G.L. ; Heijink, W. ; Bakker, H. de; Boersma, O.H. ; Hamming, C. - \ 1991
Wageningen : Staring Centrum - 65
kaarten - nederland - bodemkarteringen - maps - netherlands - soil surveys
Bodemkaart van Nederland 1:50.000 : toelichting bij kaartblad 61 - 62 west en oost, Maastricht - Heerlen
Vleeshouwer, J.J. ; Damoiseaux, J.H. ; Steur, G.G.L. ; Heijink, W. ; Bakker, H. de; Boersma, O.H. ; Hamming, C. - \ 1990
Wageningen : Staring Centrum - 177
bodemkarteringen - kaarten - nederland - zuid-limburg - soil surveys - maps - netherlands
Bodemkaart van Nederland 1:50.000 : toelichting bij kaartblad 44 Oost Oosterhout
Harbers, P. ; Steur, G.L. ; Heijink, W. ; Bakker, H. de; Boersma, O.H. ; Hamming, C. - \ 1990
Wageningen : Staring Centrum - 164
bodemkarteringen - kaarten - nederland - noord-brabant - soil surveys - maps - netherlands
Bodemkaart van Nederland 1:50.000 : toelichting bij de kaartbladen 20 west Lelystad (gedeeltelijk), 20 oost Lelystad en 21 west Zwolle
Eilander, D.A. ; Heijink, W. ; Jong, F.H. de; Koning, J. ; Steur, G.G.L. ; Bakker, H. de; Boersma, O.H. ; Hamming, C. - \ 1990
Wageningen : Staring Centrum - 165
bodemkarteringen - kaarten - nederland - flevoland - overijssel - veluwe - gelderland - soil surveys - maps - netherlands
Bodemkaart van Nederland schaal 1:50.000 : toelichting bij de kaartbladen 22 west Coevorden en 22 oost Coevorden
Booij, A.H. ; Hamming, C. ; Stuurman, F. ; Steur, G.G.L. ; Heijink, W. ; Bakker, H. de; Boersma, O.H. - \ 1989
Wageningen : Staring Centrum - 171
bodemkarteringen - kaarten - nederland - overijssel - drenthe - soil surveys - maps - netherlands
Onderzoek naar de geschiktheid van diepverwerkte veenkoloniale gronden voor de produktie van fabrieksaardappelen
Hamming, C. ; Soesbergen, G.A. van - \ 1988
Wageningen : STIBOKA (Stichting voor Bodemkartering nr. 80102) - 74
bodemgeschiktheid - veengronden - fabrieksaardappelen - soil suitability - peat soils - starch potatoes
Bodemkaart van Nederland schaal 1: 50.000 : toelichting bij kaartblad 44 West Oosterhout
Damoiseaux, J.H. ; Vos, G.A. ; Steur, G.G.L. ; Heijink, W. ; Bakker, H. de; Boersma, O.H. ; Hamming, C. - \ 1987
Wageningen : STIBOKA - 157
bodemkarteringen - kaarten - nederland - noord-brabant - soil surveys - maps - netherlands
Bodemkaart van Nederland schaal 1 : 50.000 : toelichting bij de kaartbladen 48 Oost Middelburg en 49 West Bergen op Zoom
Bazen, M.A. ; Steur, G.G.L. ; Heijink, W. ; Bakker, H. de; Boersma, O.H. ; Hamming, C. - \ 1987
Wageningen : STIBOKA - 166
bodemkarteringen - kaarten - nederland - zeeland - zeeuwse eilanden - soil surveys - maps - netherlands
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