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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On solving a bi-level stohastic dynamic programming model for analyzing fisheries policies: Fishermen behavior and optimal fish quota
Dijk, D. van; Hendrix, E.M.T. ; Haijema, R. ; Groeneveld, R.A. ; Ierland, E.C. van - \ 2014
Ecological Modelling 272 (2014). - ISSN 0304-3800 - p. 68 - 75.
bioeconomic model - game-theory - management - uncertainty - adjustment - resource - growth - sea
Stochastic dynamic programming (SDP) is a useful tool for analyzing policy questions in fisheries management. In order to understand and reproduce solution procedures such as value function iteration, an analytic elaboration of the problem and model characteristics is required. Because of the increased use of numerical techniques, our aim is to improve the understanding of mathematical properties of the solution procedure and to give more insight into their practical implementation by means of a specific case that uses value function iteration. We provide an analytic description of model characteristics and analyze the solution procedure of a bi-level SDP model to study fisheries policies. At the first level, a policy maker decides on the fish quota to be imposed, keeping in mind fish stock dynamics, capital stock dynamics, long-term resource rents and anticipating fishermen behavior. At the second level, fishermen reveal short-term behavior by reacting on this quota and on current states of fish stock and capital stock by deciding on their investments and fishing effort. An analysis of the behavior of the model is given and a method is elaborated to obtain optimum strategies based on value function iteration. Bi-level decision making enables us to present the model in an understandable manner, and serves as a basis for extension to more complex settings.
The impact of piped water on household welfare: evidence from Vietnam
Viet Cuong, N. ; Vu, T. - \ 2013
Journal of Environmental Planning and Management 56 (2013)9. - ISSN 0964-0568 - p. 1332 - 1358.
reduce diarrhea - bias - adjustment - estimators - india
Clean water is essential for human survival. However, a large proportion of people do not have access to clean water in Vietnam. Approximately only 23% of the population had access to piped water in 2006. This study measures the effect of piped water on household welfare using difference-in-differences estimators and panel data from Vietnam Household Living Standard Surveys. It found that the effect of piped water on household income and working efforts are positive, but are small and not statistically significant. Similarly, the effect of piped water on the sickness of household members is negative, but not statistically significant
Linking investment spikes and productivity growth
Geylani, P.C. ; Stefanou, S.E. - \ 2013
Empirical Economics 45 (2013)1. - ISSN 0377-7332 - p. 157 - 178.
manufacturing plants - dynamics - technology - industry - adjustment - patterns - adoption
We investigate the relationship between productivity growth and investment spikes using Census Bureau’s plant-level dataset for the U.S. food manufacturing industry. There are differences in productivity growth and investment spike patterns across different sub-industries and food manufacturing industry in general. Our study finds empirical support for the learning-by-doing hypothesis by identifying some cases where the impact of investment spikes on TFP growth presents a U-shaped investment age–productivity growth pattern. However, efficiency and the learning period associated with investment spikes differ among plants across industries. The most pronounced impact of investment age on productivity growth (5.3 % for meat products, 4% for dairy products, and 2.8 % in all food manufacturing plants) occurs during the fifth year of post-investment spike. Thus, in general, the productivity gains tend to be fully realized with a 5-year technology learning period for this industry.
Understanding trait interactions and their impacts on growth in Scots pine branches across Europe.
Sterck, F.J. ; Martinez-Vilalta, J. ; Mencuccini, M. ; Cochard, H. ; Gerrits, P. ; Zweifel, R. ; Herrero, A. ; Korhonen, J.F.J. ; Llorens, P. ; Nikinmaa, E. ; Nole, A. ; Poyatos, R. ; Ripullone, F. ; Sass-Klaassen, U. - \ 2012
Functional Ecology 26 (2012)2. - ISSN 0269-8463 - p. 541 - 549.
xylem cavitation resistance - stress-induced cavitation - hydraulic efficiency - functional traits - tree structure - pit membranes - trade-offs - drought - adjustment - hypothesis
1. Plants exhibit a wide variety in traits at different organizational levels. Intraspecific and interspecific studies have potential to demonstrate functional relationships and trade-offs amongst traits, with potential consequences for growth. However, the distinction between the correlative and functional nature of trait covariation presents a challenge because traits interact in complex ways. 2. We present an intraspecific study on Scots pine branches and use functional multi-trait concepts to organize and understand trait interactions and their impacts on growth. Branch-level traits were assessed for 97 branches from 12 Scots pine sites across Europe. 3. To test alternative hypotheses on cause-effect relationships between anatomical traits, hydraulic traits and branch growth, we measured for each branch: the tracheid hydraulic diameter, double cell wall thickness, cell lumen span area, wood density, cavitation vulnerability, wood-specific hydraulic conductivity, the leaf area to sapwood area ratio and branch growth. We used mixed linear effect models and path models to show how anatomical traits determine hydraulic traits and, in turn, how those traits influence growth. 4. Tracheid hydraulic diameter was the best predictor of cavitation vulnerability (R-2 = 0 09 explained by path model) and specific conductivity (R-2 = 0 19) amongst anatomical traits. Leaf area to sapwood area ratio had the strongest direct effect on branch growth (R-2 = 0 19) and was positively associated with the tracheid hydraulic diameter (R-2 = 0 22). A number of bivariate correlations between traits could be explained by these functional relationships amongst traits. 5. The plasticity in tracheid hydraulic diameter (10.0-15.1 mu m) and leaf area to sapwood area ratio (600-6051 cm(2) cm(-2)) and the maintenance of a minimum leaf water potential (between) 2 and) -2.5 MPa) appear to drive the anatomical and hydraulic traits of Scots pine across Europe. These properties are major drivers of the functional trait network underlying the growth variation amongst pine branches and thus possibly contribute to the ecological success of pines at a local and continental scale.
Adapting to climate change: examples from the Netherlands
Ritzema, H.P. - \ 2011
In: Proceeding 25th ICID European Regional Conference, Deltas in Europe, Integrated water management for multiple land use in flat coastal areas. - - p. A1 - 4-1-10.
klimaatverandering - hoogwaterbeheersing - kustgebieden - aanpassing - adaptatie - landgebruik - mitigatie - scenario-analyse - climatic change - flood control - coastal areas - adjustment - adaptation - land use - mitigation - scenario analysis
Higher water levels and more space for water will fundamentally change the way our coastal lowlands are being managed. Appropriate conservation, adaptation and mitigation actions need to take place in the context of sustainable development. In the Netherlands, adaptation measures focus on the water management system as well as the spatial planning. The selection of adaptation measures, mainly depends the type of land use. For the three major types of land types, i.e. the low-lying peatlands in the western part of the country, the higher sandy soil areas in the east and southeast and the marine clay areas in the reclaimed polder areas, adaptation measures, for both agriculture and nature, adaption strategies are discussed.
Trainen voor nog betere rooikwaliteit : Praktijktraining bij PPO-Lelystad
PPO Akkerbouw, Groene Ruimte en Vollegrondsgroente, - \ 2011
sugarbeet - beet harvesters - drivers - grubbing - adjustment - yield losses - arable farming
Kansen op de mestmarkt door mestscheiding en voeraanpassingen
Hoop, D.W. de; Lakner, D. ; Cooten, W.C. van; Hoop, J.G. de; Bikker, A.M. ; Prins, H. ; Gebrezgabher, S.A. ; Meuwissen, M.P.M. - \ 2011
Den Haag : LEI, onderdeel van Wageningen UR (Rapport / LEI : Onderzoeksveld Sector en ondernemerschap ) - ISBN 9789086154760 - 54
dierlijke meststoffen - mestverwerking - scheiding - innovaties - markten - voedering - normen - aanpassing - animal manures - manure treatment - separation - innovations - markets - feeding - standards - adjustment
Deze studie is gericht op de kansen voor verlichting van de toekomstige mestmarkt door mestscheiding en voeraanpassingen. Dit wordt geplaatst in de context van de toekomstige aanscherping van de normen voor het gebruik van mest. Een plan van aanpak geeft aanbevelingen om deze kansen te benutten.
Parental control and the dopamine D2 receptor gene (DRD2) interaction on emotional eating in adolescence
Strien, T. van; Snoek, H.M. ; Zwaluw, C.S. van der; Engels, R.C. - \ 2010
Appetite 54 (2010)2. - ISSN 0195-6663 - p. 255 - 261.
psychological control - adjustment - behavior - overweight - depression - stress - reward - food - polymorphism - sensitivity
The present study addresses the emergence of emotional eating in adolescence in relation to maternal or paternal psychological control. A reduction of food intake is considered the biological natural response to distress, therefore we tested whether the a-typical stress response of emotional eating develops in interaction with genetic vulnerability. Carrying the A1 allele of the dopamine D2 receptor (DRD2) gene Taq1A polymorphism (rs1800497) is associated with reduced dopamine D2 receptor availability in the brain. We hypothesized that carrying this allele would confer risk for the development of emotional eating, particularly so in adolescents with adverse rearing experiences. Participants were 279 Dutch adolescents (average age of 13.4) that participated in a prospective study with a four-year follow-up. We found a moderator effect of DRD2 genotype on the relation between both maternal and paternal psychological control and increases in emotional eating in both sexes. Adolescents showed only an increase in emotional eating in relation to high psychological control if they carried at least one DRD2 A1 allele. This study is the first to show that the relationship between adverse rearing experiences and emotional eating might be dependent on genetic make-up.
Measuring excess capital capacity in agricultural production
Zhengfei, G. ; Kumbhakar, S.C. ; Myers, R.J. ; Oude Lansink, A.G.J.M. - \ 2009
American Journal of Agricultural Economics 91 (2009)3. - ISSN 0002-9092 - p. 765 - 776.
stochastic frontier model - panel-data - technical efficiency - labor-use - estimators - investment - adjustment - specification - heterogeneity - uncertainty
We introduce the concept "excess capital capacity" and employ a stochastic input requirement frontier to measure excess capital capacity in agricultural production. We also propose a two-step estimation method that allows endogenous regressors in stochastic frontier models. The first step uses generalized method of moments to get consistent estimates of the frontier parameters in the presence of endogenous regressors. The second step uses maximum likelihood to measure excess capital capacity and evaluate the factors that influence it. The empirical application to Dutch cash crop farms found varying degrees of excess capital capacity. The policy implications of excess capital capacity are discussed
Employee identification before and after an internal merger: a longitudinal analysis
Bartels, J. ; Pruyn, A.T.H. ; Jong, M.D.T. de - \ 2009
Journal of Occupational and Organizational Psychology 82 (2009)1. - ISSN 0963-1798 - p. 113 - 128.
perceived external prestige - social identity perspective - organizational identification - turnover intentions - job-satisfaction - citizenship behaviors - affective commitment - distinct aspects - adjustment - impact
Earlier studies have shown that perceived external prestige (PEP) and communication climate influence employees' overall organizational identification. This paper presents the results of a longitudinal study into the determinants of organizational identification at two organizational levels during an internal merger. Data were collected in a university where four divisions merged into two new divisions. Respondents filled out a questionnaire on organizational identification, PEP and communication climate 4 months before the merger (T1) and 2 years after the merger (T2). Results indicate that pre-merger identification primarily influences post-merger identification at the same organizational level. Furthermore, the determinants of employees' overall organizational identification differ from the determinants of employees' division identification. Internal communication climate is particularly important for employees' identification with their division. PEP affects employees' identification with the overall organization. Management implications are discussed for monitoring employee identification both in times of (internal) mergers and in general
Some Consequences of the 1994–1995 Coffee Boom for Growth and Poverty Reduction in Uganda
Chant, L.J. ; McDonald, S. ; Verschoor, A. - \ 2008
Journal of Agricultural Economics 59 (2008)1. - ISSN 0021-857X - p. 93 - 113.
world commodity prices - dutch disease - adjustment
This paper reports a computable general equilibrium analysis that explores the consequences of the 1994–1995 increase in the international price of coffee for Uganda’s economy. Evidence is found for a small effect on both medium-term growth and poverty reduction. Aid dependence is among the reasons why this effect is not found to be larger. Major beneficiary groups are not primarily the farmers to which the windfall initially accrued, but urban wage earners and the urban self-employed.
Adapting UASB technology for sewage treatment in Palestine and Jordan
Mahmoud, N.A. ; Zeeman, G. ; Lier, J.B. van - \ 2008
Water Science and Technology 57 (2008)3. - ISSN 0273-1223 - p. 361 - 366.
afvalwaterbehandeling - anaërobe behandeling - rioolwater - tropisch klimaat - aanpassing - jordanië - zuiveringsinstallaties - palestina - waste water treatment - anaerobic treatment - sewage - tropical climate - adjustment - jordan - purification plants - palestine - domestic sewage - low-temperature - waste-water - reactor
High rate anaerobic technologies offer cost-effective solutions for "sewage" treatment in the temperate climate of Palestine and Jordan. However, local sewage characteristics demand amendments to the conventional UASB reactor design. A solution is found in a parallel operating digester unit that stabilises incoming solids and enriches the UASB sludge bed with methanogenic activity. The digester operational conditions were assessed by operating eight CSTRs fed with primary sludge. The results showed a high degree of sludge stabilization in the parallel digesters at SRTs10 and 15 days at process temperatures of 35 and 25°C, respectively. The technical feasibility of the UASB-digester combination was demonstrated by continuous flow pilot-scale experiments. A pilot UASB reactor was operated for 81 days at 6 hours HRT and 15°C and was fed with raw domestic sewage. This period was subsequently followed by an 83 day operation period incorporating a parallel digester unit, which was operated at 35°C. The UASB-digester combination achieved removal efficiencies of total, suspended, colloidal and dissolved CODs of respectively 66, 87, 44 and 30%. Preliminary model calculations indicated that a total reactor volume of the UASB-digester system corresponding to 8.6 hours HRT might suffice for sewage treatment in Palestine
Melkveehouders over hun strategie in de komende jaren : notitie in kader van project "Melken in de Nieuwe Realiteit"
Haan, M.H.A. de; Zijlstra, J. - \ 2008
[Wageningen] : Animal Sciences Group - 16
melkveehouderij - melkveebedrijven - bedrijfsontwikkeling in de landbouw - tendensen - technologie - aanpassing - melkprijzen - agrarische bedrijfsvoering - agrarische bedrijfsplanning - vragenlijsten - toekomst - dairy farming - dairy farms - farm development - trends - technology - adjustment - milk prices - farm management - farm planning - questionnaires - future
Binnen het onderzoek “Melken in de Nieuwe Realiteit” wordt de toekomst van de Nederlandse melkveehouderij verkend met als doel om zicht te krijgen op belangrijke beslissingen die melkveehouders in de komende vijf jaar zullen nemen. Dat gebeurt via meerdere wegen. In deze notitie worden de resultaten besproken van een onderzoek naar beelden die Nederlandse melkveehouders hebben van de ontwikkeling van de melkveehouderij in de komende vijf jaar. Deze beelden worden hier ontleend aan de resultaten van een enquête die gehouden is onder in totaal 73 melkveehouders met een sterke belangstelling voor de toekomst van de sector en de strategie voor het eigen bedrijf in het bijzonder
Europese toeslagen en premies: aanpassing heeft flinke gevolgen
Bont, C.J.A.M. de; Helming, J.F.M. - \ 2007
Agri-monitor 2007 (2007)april. - ISSN 1383-6455 - 2
landbouwbeleid - financieel landbouwbeleid - subsidies - ondersteunende maatregelen - premies - gemeenschappelijk landbouwbeleid - inkomsten uit het landbouwbedrijf - aanpassing - agricultural policy - agricultural financial policy - support measures - grants - cap - farm income - adjustment
De vereenvoudiging van het toeslagenbeleid naar een uniforme hectaretoeslag kan voor het merendeel van de agrarische bedrijven gunstig uitpakken. Voor een kleiner deel is de vereenvoudiging van nadeel. Verder zal door een uniformering van het toeslagenbeleid vooral het aantal zetmeelaardappelbedrijven verminderen.
Klimaatverandering en versnippering een slechte combinatie
Bugter, R.J.F. ; Vos, C.C. ; Noorden, B. ; Steenwijk, H. van - \ 2007
Vakblad Natuur Bos Landschap 4 (2007)8. - ISSN 1572-7610 - p. 24 - 27.
klimaatverandering - aanpassing - migratie - ecologische hoofdstructuur - limburg - habitatfragmentatie - climatic change - adjustment - migration - ecological network - habitat fragmentation
Een van de effecten van klimaatverandering is dat de geschikte klimaatcondities voor soorten verschuiven. De verspreidingsgebieden van koudeminnende soorten verschuiven naar het noorden en bergopwaarts. In het Europese BRANCH project is op Noordeuropese schaal onderzocht waar de ecologische netwerken klimaatbestendig zijn en waar zich zwakke plekken bevinden. Een van deze studies betreft robuste verindingen in Limburg
Meer bewegingsvrijheid voor dieren
Luesink, H.H. - \ 2005
Agri-monitor 2005 (2005)juni. - ISSN 1383-6455 - 2
mest - beleid - melkveebedrijven - landgebruik - graslanden - voedingsrantsoenen - aanpassing - bemesting - manures - policy - dairy farms - land use - grasslands - feed rations - adjustment - fertilizer application
Nederlandse landbouwhuisdieren kunnen steeds vaker genieten van meer bewegingsvrijheid in de stal. Zo is het merendeel van het melk- en jongvee gehuisvest in een ligboxenstal en is het aandeel scharrelstallen in de pluimveehouderij de afgelopen jaren flink gestegen. Dit laatste houdt vooral verband met het batterijverbod dat in 2013 van kracht gaat.
Veel tijd, nooit weg, een onderzoek naar aangepaste vakanties
Welt, G. ; Renes, R.J. - \ 2005
Wageningen : Wageningen UR, Wetenschapswinkel (Rapport / Wetenschapswinkel Wageningen UR 216) - ISBN 9067549304 - 66
vakanties - vrije tijd - aanpassing - toeristenindustrie - ouderen - gehandicapten - nederland - sociale zorg - holidays - leisure - adjustment - tourist industry - elderly - people with disabilities - netherlands - social care
Onderzoek in opdracht van Stichting Mens en Samenleving, die zich richt op het aanbieden van vakanties voor ouderen, gehandicapten en chronisch zoeken. SMS wil deze activiteit verbeteren en uitbreiden. Dit onderzoek analyseert: de doelgroep, de aanbieders van aangepaste vakantie, de zorg die erbij nodig is, de groen ruimte in dit verband
Schietfuiken op het IJsselmeer en Markermeer: een verkenning van technische aanpassingen om bijvangsten te reduceren op basis van experimenten en gegevens van vissers
Bult, T.P. ; Deerenberg, C.M. - \ 2005
IJmuiden : RIVO (Rapport / Nederlands Instituut voor Visserij Onderzoek (RIVO) C068/05) - 26
visserijbeleid - vistuig - experimenteel veldonderzoek - aanpassing - aanpassingsvermogen - beleidsonderzoek - vismethoden - bijvangst - fishery policy - fishing gear - field experimentation - adjustment - adaptability - policy research - fishing methods - bycatch
Het Ministerie van LNV is van plan om per 1 januari 2008 het gebruik van schietfuiken in het Markermeer en IJsselmeer te verbieden, tenzij de vissers aan kunnen tonen dat de bijvangsten van deze visserij sterk kunnen worden verminderd. De achtergrond van deze voorgestelde maatregel is het beeld dat de bijvangsten van schietfuiken (te) groot zijn en niet of nauwelijks verminderd kunnen worden. Vissers bestrijden dit beeld en hebben ook ideeën om bijvangsten te reduceren. Echter, gegevens over de effectiviteit van deze ideeën ontbraken. Het Productschap Vis en de PO-IJsselmeer hebben daarom het RIVO gevraagd deze vissers te begeleiden met onderzoek. Dit project heeft uiteindelijk laten zien dat vissers goed in staat zijn zelf oplossingen te verzinnen. Door gezamenlijk de evaluatie van deze ideeën uit te voeren, is in korte tijd veel bereikt.
Adjustment and differences in farm performance - a farm management perspective from the Netherlands
Poppe, Krijn - \ 2004
farm management - performance - adjustment - predicted difference
Bedreigde en kwetsbare mossen in Nederland: correcties op het basisrapport (Buxbaumiella 54)
Siebel, H.N. ; Bijlsma, R.J. - \ 2004
Buxbaumiella 68 (2004). - ISSN 0166-5405 - p. 56 - 64.
mossen - bedreigde soorten - inventarisaties - aanpassing - mosses - endangered species - inventories - adjustment
Eind 2001 is in opdracht van het EC-LNV het Basisrapport met voorstel voor de Rode Lijst (Siebel et al. 2000) uitgewerkt tot een Toelichting op de Rode Lijst (Siebel, Bijlsma & Bal, te publiceren). Hierbij bleek het nodig het basisrapport op enkele punten aan te passen. Deze aanpassingen worden hier toegelicht. Een bijgewerkte Rode Lijst (RL) is toegevoegd als bijlage.
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