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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    Bayesian wavelet de-noising with the caravan prior
    Gugushvili, Shota ; Meulen, Frank Van Der; Schauer, Moritz ; Spreij, Peter - \ 2020
    ESAIM - Probability and Statistics 23 (2020). - ISSN 1292-8100 - p. 947 - 978.
    Caravan prior - Discrete wavelet transform - Gamma markov chain - Gibbs sampler - Regression - Wavelet de-noising

    According to both domain expert knowledge and empirical evidence, wavelet coefficients of real signals tend to exhibit clustering patterns, in that they contain connected regions of coefficients of similar magnitude (large or small). A wavelet de-noising approach that takes into account such a feature of the signal may in practice outperform other, more vanilla methods, both in terms of the estimation error and visual appearance of the estimates. Motivated by this observation, we present a Bayesian approach to wavelet de-noising, where dependencies between neighbouring wavelet coefficients are a priori modelled via a Markov chain-based prior, that we term the caravan prior. Posterior computations in our method are performed via the Gibbs sampler. Using representative synthetic and real data examples, we conduct a detailed comparison of our approach with a benchmark empirical Bayes de-noising method (due to Johnstone and Silverman). We show that the caravan prior fares well and is therefore a useful addition to the wavelet de-noising toolbox.

    Duurzaamheidsprestaties 2018 in Noord-Holland : Vollegrondsgroenten
    Stokkers, R. ; Meulen, H.A.B. van der - \ 2020
    Wageningen Economic Research (Wageningen Economic Research 2020-049e) - 2 p.
    Duurzaamheidsprestaties 2018 in Noord-Holland : Melkveehouderij
    Jager, J.H. ; Meulen, H.A.B. van der - \ 2020
    Wageningen Economic Research (Wageningen Economic Research 2020-049d) - 2 p.
    Duurzaamheidsprestaties 2018 in Noord-Holland : Glastuinbouw
    Ruijs, M.N.A. ; Meulen, H.A.B. van der - \ 2020
    Wageningen Economic Research (Wageningen Economic Research 2020-049c) - 2 p.
    Duurzaamheidsprestaties 2018 in Noord-Holland : Akkerbouw
    Meer, R.W. van der; Meulen, H.A.B. van der - \ 2020
    Wageningen Economic Research (Wageningen Economic Research 2020-049b) - 2 p.
    Duurzaamheidsprestaties 2018 in Noord-Holland : Bloembollenteelt
    Stokkers, R. ; Meulen, H.A.B. van der - \ 2020
    Wageningen Economic Research (Wageningen Economic Research 2020-049a) - 2 p.
    The Care Farming Sector in The Netherlands: A Reflection on Its Developments and Promising Innovations
    Hassink, Jan ; Agricola, Herman ; Veen, Esther J. ; Pijpker, Roald ; Bruin, Simone R. De; Meulen, Harold A.B. van der; Plug, Lana B. - \ 2020
    Sustainability 12 (2020)9. - ISSN 2071-1050
    This paper describes the development of care farming in the Netherlands, one of the pioneering countries in this sector, where care farming has developed into a very diverse sector, with some farmers focussing primarily on agricultural production and others more specifically on providing care services. Care farms are increasingly open to a diversity of participants. The sector has become professionalised with the establishment of strong regional organisations and a steady growth increase in revenues, providing employment opportunities and boosting the economy of rural areas. In this paper, we highlight two promising innovations in care farming: education for school dropouts and the establishment of social farming activities in cities. These innovations face the challenge of connecting not only the agricultural and care sectors, but also the educational sector and the urban context. Initiators face a number of challenges, like trying to embed their activities in the educational sector, a mismatch in regulations and a lack of legitimacy in the case of education on care farms, as well as problems gaining access to land and a lack of recognition in the case of social farming in urban areas. However, the prospects are promising in both cases, because they match the changing demands in Dutch society and are able to integrate social, ecological and economic benefits. View Full-Text
    Is livestock grazing a key factor for changing vegetation patterns in lime rich coastal dunes in the Netherlands?
    Hagen, Harrie G.J.M. van der; Assendorp, Dan ; Calame, Wim ; Meulen, Frank van der; Sýkora, Karlè V. ; Schaminée, Joop H.J. - \ 2020
    Journal of Coastal Conservation 24 (2020)2. - ISSN 1400-0350
    Aerial photographs - Blowout - Coastal dunes - Hippophae rhamnoides - Livestock grazing - Oryctolagus cuniculus

    In 1990, livestock grazing was introduced in Meijendel, a 1800 ha lime-rich coastal dune area, at a density of 0.06–0.07 LLU.ha-1.year−1 (1:12–18 ha) to counteract encroachment of tall grasses and shrubland on dune grassland and increase the bare sand area. Monitoring was based on four digital orthophotos (1975–1990–2001-2009) with a high spatial resolution (pixel size 25 × 25 cm). The changes were tested using Generalized Estimating Equations. Habitat changes occurred, but contradicting our hypothesis, there was no significant impact from the grazing on bare sand, grassland or shrubland within 11 and 19 years post livestock introduction. (1) After several decennia of decreasing bare sand, there was a significant increase between 2001 and 2009, irrespective of livestock presence. (2) The changes in grasslands and shrublands are independent of the livestock, but dependent on distance to the coast. (3) Bare sand and shrub cover determine the space left for the dune grasslands. It appears other factors than livestock grazing must have induced the changes. Changes in climate conditions and nitrogen load might have stimulated bare sand. An interaction with the end of Marram planting in 1990 cannot be concluded from available data. The disease-led reduction of rabbit grazing from the mid-1950s led to an expansion of the dominant shrub Hippophae rhamnoides. However, Hippophae shrubland typically regresses to grasslands on its collapse after 25–40 years. Tree species like Crataegus, Betula and Quercus will gradually dominate the landscape for far longer. Active removal of these indigenous species is necessary to prevent future loss of dune grasslands.

    Measurement of Dynamical Resilience Indicators Improves the Prediction of Recovery Following Hospitalization in Older Adults
    Gijzel, Sanne M.W. ; Rector, Jerrald ; Meulen, Fokke B. van; Loeff, Rolinka Schim van der; Leemput, Ingrid A. van de; Scheffer, Marten ; Olde Rikkert, Marcel G.M. ; Melis, René J.F. - \ 2020
    Journal of the American Medical Directors Association 21 (2020)4. - ISSN 1525-8610 - p. 525 - 530.e4.
    Adaptive capacity - personalized medicine - resistance - time series analysis - wearable sensor

    Objectives: Acute illnesses and subsequent hospital admissions present large health stressors to older adults, after which their recovery is variable. The concept of physical resilience offers opportunities to develop dynamical tools to predict an individual's recovery potential. This study aimed to investigate if dynamical resilience indicators based on repeated physical and mental measurements in acutely hospitalized geriatric patients have added value over single baseline measurements in predicting favorable recovery. Design: Intensive longitudinal study. Setting and Participants: 121 patients (aged 84.3 ± 6.2 years, 60% female) admitted to the geriatric ward for acute illness. Measurements: In addition to preadmission characteristics (frailty, multimorbidity), in-hospital heart rate and physical activity were continuously monitored with a wearable sensor. Momentary well-being (life satisfaction, anxiety, discomfort) was measured by experience sampling 4 times per day. The added value of dynamical indicators of resilience was investigated for predicting recovery at hospital discharge and 3 months later. Results: 31% of participants satisfied the criteria of good recovery at hospital discharge and 50% after 3 months. A combination of a frailty index, multimorbidity, Clinical Frailty Scale, and or gait speed predicted good recovery reasonably well on the short term [area under the receiver operating characteristic curve (AUC) = 0.79], but only moderately after 3 months (AUC = 0.70). On addition of dynamical resilience indicators, the AUC for predicting good 3-month recovery increased to 0.79 (P = .03). Variability in life satisfaction and anxiety during the hospital stay were independent predictors of good 3-month recovery [odds ratio (OR) = 0.24, P = .01, and OR = 0.54, P = .04, respectively]. Conclusions and Implications: These results highlight that measurements capturing the dynamic functioning of multiple physiological systems have added value in assessing physical resilience in clinical practice, especially those monitoring mental responses. Improved monitoring and prediction of physical resilience could help target intensive treatment options and subsequent geriatric rehabilitation to patients who will most likely benefit from them.

    Food economic report 2019 of the Netherlands : Summary
    Meulen, H.A.B. van der; Berkhout, P. - \ 2020
    Wageningen : Wageningen Economic Research (Booklet Wageningen Economic Research ) - 19
    This booklet provides an English summary of the Voedsel-Economisch Bericht 2019 and Duurzaamheid en inkomens in de land- en tuinbouw ( It presents a survey of the economic state of Dutch agribusiness. Attention is paid to the development of the agricultural complex, the food industry, the retail chain and the consumption of food. The booklet then proceeds to describe the production structure in the primary agricultural sector, profitability and income formation as well as the environmental performance of the agricultural sector.
    Financiering voor duurzame landbouwbedrijven : Geld aantrekken op de sociale en ecologische waarden die jij als boer creëert
    Drion, Susan ; Boxtel, Maria van; Vijn, Marcel ; Meulen, Harold van der - \ 2020
    Wageningen : Wageningen University & Research - 23
    Het aantal duurzame landbouwbedrijven groeit. Het realiseren van een duurzame bedrijfsvoering vraagt vaakom investeringen. Bijvoorbeeld investeringen in extra grond of in duurzame bedrijfsgebouwen. Investeringendie jij als agrarisch ondernemer inzet om de sociale, ecologische en economische waarden te realiseren. Naastvoedsel produceren duurzame landbouwbedrijven namelijk ook ecologische waarden, zoals biodiversiteit eneen gezonde bodem. En sociale waarden, zoals het in stand houden van een mooi landschap, recreatie of zorg.Plus je produceert economische waarden voor jou als boer en de mensen om je heen, zoals werkgelegenheid.Welke mogelijkheden heb je om jouw duurzame plannen te financieren?
    Decompounding discrete distributions: A nonparametric Bayesian approach
    Gugushvili, Shota ; Mariucci, Ester ; Meulen, Frank van der - \ 2020
    Scandinavian journal of statistics 47 (2020)2. - ISSN 0303-6898 - p. 464 - 492.
    compound Poisson process - data augmentation - diophantine equation - Gibbs sampler - Metropolis-Hastings algorithm - Nonparametric Bayesian estimation

    Suppose that a compound Poisson process is observed discretely in time and assume that its jump distribution is supported on the set of natural numbers. In this paper we propose a nonparametric Bayesian approach to estimate the intensity of the underlying Poisson process and the distribution of the jumps. We provide a Markov chain Monte Carlo scheme for obtaining samples from the posterior. We apply our method on both simulated and real data examples, and compare its performance with the frequentist plug-in estimator proposed by Buchmann and Grübel. On a theoretical side, we study the posterior from the frequentist point of view and prove that as the sample size n→∞, it contracts around the “true,” data-generating parameters at rate 1/√n, up to a n factor.

    Determination of the irreversible loss rate of amino acids in broilers
    Meulen, J. van der; Wikselaar, P. van; Jansman, A.J.M. - \ 2019
    Wageningen : Wageningen Livestock Research (Wageningen Livestock Research report 1169) - 16
    Labelling requirements in the EU and US for restructured and mechanically tenderized beef – a comparative legal analysis
    Meijer, N.P. ; Weesepoel, Y.J.A. ; Jonge, R. de; Meulen, B.M.J. van der; Raamsdonk, L.W.D. van; Ruth, S.M. van - \ 2019
    European Food and Feed Law Review 14 (2019). - ISSN 1862-2720 - p. 231 - 242.
    Eiwitreductie moet mogelijk zijn
    Dijkstra, Jan - \ 2019
    Vermogensaandeel gebouwen niet groot
    Silvis, H.J. ; Meulen, H.A.B. van der - \ 2019
    De Landeigenaar 65 (2019)2. - ISSN 0166-5839 - p. 22 - 23.
    Actuele ontwikkeling resultaten en inkomens in land-en tuinbouw 2019
    Hietbrink, Olaf ; Pierik, C. ; Meulen, Harold van der - \ 2019
    The geological significance of novel anthropogenic materials : Deposits of industrial waste and by-products
    Dijkstra, Joris J. ; Comans, Rob N.J. ; Schokker, Jeroen ; Meulen, Michiel J. van der - \ 2019
    Anthropocene 28 (2019). - ISSN 2213-3054
    Anthropogenic material - Geological mapping - Urban geochemistry - Urban geology - Waste - Weathering

    Industrial wastes and by-products are increasingly (re-)used as filling material in constructions. To enhance awareness among the geological community of the growing and widespread occurrence of deposits that contain these “novel anthropogenic materials”, this paper reviews three volumetrically important materials: (1) ash remaining from the incineration of household waste (Municipal Solid Waste Incineration bottom ash), (2) slag from steel production, and (3) the stony aggregate fraction of construction and demolition waste. We review their origin, main geochemical weathering reactions, and influence on the natural geogenic environment. These materials have properties that set them apart from the geogenic materials that they replace and overlie. They are formed under high-temperature conditions, are thermodynamically unstable, and may exhibit physical and chemical changes on relatively short timescales, an aspect relatively new for mapping geologists. Because knowledge of deposits in the shallow urban subsurface is increasingly important for urban planning, more articulation and detail in the classification of novel anthropogenic materials is necessary.

    Beleidsevaluatie Garantstelling Landbouw : Eindrapport
    Meurs, Elvira ; Witmond, Bart ; Wilbers, Gert-Jan ; Meulen, H.A.B. van der; Asseldonk, M.A.P.M. van; Wonderen, Dominique van; Pamuk, H. - \ 2019
    ECORYS - 77 p.
    Investeringsniveau duurzame productiemiddelen : Duurzaamheidsindicator (DP01) in de Rijksbegroting 2020
    Meulen, Harold van der; Wisman, Arjan ; Jager, Jakob ; Jukema, Gerben ; Meer, Ruud van der - \ 2019
    Wageningen : Wageningen Economic Research (Wageningen Economic Research nota 2019-116) - 31
    Op verzoek van de Tweede Kamer worden de prestaties van het ministerie van Landbouw, Natuur en Voedselkwaliteit (LNV) jaarlijks gemeten op basis van indicatoren voor landbouw, tuinbouw en visserij die in de Rijksbegroting 2020 tot uitdrukking moeten komen. De indicatoren zijn opgedeeld in vier domeinen, te weten: ‘duurzaam produceren’, ‘kennis en innovatie’, ‘voedsel en dier’ en ‘natuur, landschap en platteland’. In deze nota worden de resultaten van de duurzaamheidsindicator DP01 gepresenteerd inzake het investeringsniveau van duurzame productiesystemen in de landbouw en visserij. Het betreft hierbij het definitief vaststellen van de indicator DP01 voor 2017 en het maken van een inschatting voor 2019.
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