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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    Bollenrevolutie 4.0 - detectie van afwijkende bollen
    Ruizendaal, J.L. ; Vilsteren, Sjoerd van - \ 2020
    Wageningen : Wageningen Plant Research, Business unit Glastuinbouw
    In de PPS Bollenrevolutie 4.0 wordt er ook onderzoek gedaan naar het inzetten van geavanceerde technieken voor de bepaling van de kwaliteit van bloembollen tijdens het verwerkingsproces. Bekijk hier de aanpak.
    Onderzoek naar detectie van latente Fusarium in bollen
    Ruizendaal, J.L. - \ 2019
    Onder Glas 2019 / 16 (2019)12. - p. 37 - 37.
    Minimale verdamping bij de broei van tulpen : Fase III: kiepgevoeligheid, cultivars en ventilatieregime
    Wildschut, Jeroen ; Dam, Martin van - \ 2019
    Bleiswijk : Stichting Wageningen Research, Wageningen Plant Research, Business unit Glastuinbouw- Bollen (Rapport WPR 899) - 30
    Energy use for hydroponic tulip forcing in multiple layer systems is determined by transpiration. Reduced transpiration when Relative Humidity (RH) is high (RH> 95%) results in topple. Previous research of Wageningen University & Research (WUR) showed transpiration (RH < 80%) to be important especially during the second third part of forcing: the topple sensitive phase. However, during this phase a daily exposure to a RV > 95% of 5 – 10 hours appeared to be tolerated. This is confirmed by the present WUR research: up to 6 hours without ventilation does not increase the incidence of topple. While more days with good ventilation during the topple sensitive phase reduces the amount of topple. However, cultivars differ remarkably in sensitivity to limited transpiration. Some are hardly sensitive, some are sensitive for a short time only (6 days), some for a much longer period (10 days). Maintaining a RV < 80% only during the topple sensitive phase will reduce energy use strongly. For application of these findings, more research is necessary. This research was funded by Min. LNV.
    Rethinking resource allocation in science
    Bollen, Johan ; Carpenter, Stephen R. ; Lubchenco, Jane ; Scheffer, Marten - \ 2019
    Ecology and Society 24 (2019)3. - ISSN 1708-3087
    Computational science - Peer review - Science funding - Science policy - Self-organization

    Many funding agencies rely on grant proposal peer review to allocate scientific funding, i.e., researchers compete for funding by submitting proposals that are reviewed and ranked by committees of their peers. Only a fraction of applicants are awarded the requested funds. This system has a long and venerable tradition, but it is increasingly struggling to handle the larger number of applications, suffers from high levels of administrative overhead, may be unreliable in separating successful from unsuccessful projects, and may suffer from bias against innovative ideas, young researchers, and female scientists. We have proposed redesigning funding systems according to a few simple principles, namely, focusing on funding people instead of projects and involving as many scientists in funding decisions as possible. This underpins a proposal for a novel funding system in which every scientist periodically receives an equal, unconditional amount of funding but must anonymously donate a given fraction of everything he or she receives to other scientists of his or her choice. Over time, this simple process will lead to a funding distribution that reflects the entire scientific community, fosters young scientists, and reduces overhead. However, in spite of its simplicity, we must address certain challenges in its implementation such as deciding who participates in the funding system, how to control for conflicts of interest and bias, and how to manage its application. Funding agencies will play a pivotal role in the development and management of this system.

    Verwerken van bollen kan beter en schoner
    Wildschut, J. - \ 2019
    Vitale lelieteelt: minder chemie in teelt van bollen
    Slootweg, G. - \ 2019
    Onder Glas 16 (2019)2. - p. 37 - 37.
    Evergreen – Rhizobacteriën in bollenteelt. Inleiding + discussie over de tussentijdse resultaten van het project Evergreen – bollen.
    Dam, M.F.N. van - \ 2019
    The minute-scale dynamics of online emotions reveal the effects of affect labeling
    Fan, Rui ; Varol, Onur ; Varamesh, Ali ; Barron, Alexander ; Leemput, I.A. van de; Scheffer, M. ; Bollen, J.L.T. - \ 2019
    Nature Human Behaviour 3 (2019). - ISSN 2397-3374 - p. 92 - 100.
    Putting one’s feelings into words (also called affect labeling) can attenuate positive and negative emotions. Here, we track the evolution of specific emotions for 74,487 Twitter users by analysing the emotional content of their tweets before and after they explicitly report experiencing a positive or negative emotion. Our results describe the evolution of emotions and their expression at the temporal resolution of one minute. The expression of positive emotions is preceded by a short, steep increase in positive valence and followed by short decay to normal levels. Negative emotions, however, build up more slowly and are followed by a sharp reversal to previous levels, consistent with previous studies demonstrating the attenuating effects of affect labeling. We estimate that positive and negative emotions last approximately 1.25 and 1.5 h, respectively, from onset to evanescence. A separate analysis for male and female individuals suggests the potential for gender-specific differences in emotional dynamics.
    Author Correction: Human Sexual Cycles are Driven by Culture and Match Collective Moods
    Wood, Ian B. ; Varela, Pedro L. ; Bollen, Johan ; Rocha, Luis M. ; Gonçalves-Sá, Joana - \ 2018
    Scientific Reports 8 (2018)1. - ISSN 2045-2322 - 1 p.

    A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.

    Heetstook als alternatief voor warmwaterbehandeling narcis
    Bisschops, B. ; Vreeburg, P.J.M. - \ 2018
    Greenity (2018)17. - ISSN 2589-4099 - p. 50 - 51.
    Een warmwaterbehandeling (wwb) werkt goed om stengelaaltjes in narcis te bestrijden. Nadeel van een wwb: het proceswater raakt besmet met Fusariumsporen. Gezonde bollen raken daardoor ook besmet. Heetstook van narcis kan een alternatief zijn.
    Evergreen – bollen Plantengroei bevorderende rhizobacteriën
    Dam, M.F.N. van; Breeuwsma, S.J. ; Huisman, Huei Ming ; Greve, Gerdit ; Wal, A. van der - \ 2018
    - 1 p.
    Residuenonderzoek in bloembollen
    Kuik, A.J. van; Kreuk, F. - \ 2018
    Randwijk : Wageningen University & Research, Open Teelten - 69 p.
    Human Sexual Cycles are Driven by Culture and Match Collective Moods
    Wood, Ian B. ; Varela, Pedro L. ; Bollen, Johan ; Rocha, Luis M. ; Gonçalves-Sá, Joana - \ 2017
    Scientific Reports 7 (2017)1. - ISSN 2045-2322
    Human reproduction does not happen uniformly throughout the year and what drives human sexual cycles is a long-standing question. The literature is mixed with respect to whether biological or cultural factors best explain these cycles. The biological hypothesis proposes that human reproductive cycles are an adaptation to the seasonal (hemisphere-dependent) cycles, while the cultural hypothesis proposes that conception dates vary mostly due to cultural factors, such as holidays. However, for many countries, common records used to investigate these hypotheses are incomplete or unavailable, biasing existing analysis towards Northern Hemisphere Christian countries. Here we show that interest in sex peaks sharply online during major cultural and religious celebrations, regardless of hemisphere location. This online interest, when shifted by nine months, corresponds to documented human births, even after adjusting for numerous factors such as language and amount of free time due to holidays. We further show that mood, measured independently on Twitter, contains distinct collective emotions associated with those cultural celebrations. Our results provide converging evidence that the cyclic sexual and reproductive behavior of human populations is mostly driven by culture and that this interest in sex is associated with specific emotions, characteristic of major cultural and religious celebrations.
    PSTVd in Dahlia lijkt geen probleem
    Leeuwen, P.J. van - \ 2017
    Lisse : Wageningen University & Research - 1 p.
    Hygiëneprotocol PSTVd Dahlia : Herziene versie 2017
    Leeuwen, P.J. van - \ 2017
    Lisse : Wageningen University & Research - 2 p.
    Toetsontwikkeling en systeemaanpak PSTVd in Dahlia
    Leeuwen, P.J. van; Trompert, J.P.T. ; Verbeek, M. ; Lemmers, M.E.C. ; Meekes, E.T.M. - \ 2017
    Lisse : Wageningen University & Research - 26 p.
    Detecteren zieke bollen (HNV)
    Mulder, Bram - \ 2017
    Video over detecteren zieke bollen
    Werken met BOLLEN kan slimmer
    Gude, H. - \ 2017

    PPS Het Nieuwe Verwerken gestart

    The happiness paradox : your friends are happier than you
    Bollen, Johan ; Gonçalves, Bruno ; Leemput, Ingrid van de; Ruan, Guangchen - \ 2017
    EPJ Data Science 6 (2017). - ISSN 2193-1127 - 10 p.
    data science - friendship paradox - natural language processing - sentiment analysis - social media - social network - subjective well-being

    Most individuals in social networks experience a so-called Friendship Paradox: they are less popular than their friends on average. This effect may explain recent findings that widespread social network media use leads to reduced happiness. However the relation between popularity and happiness is poorly understood. A Friendship paradox does not necessarily imply a Happiness paradox where most individuals are less happy than their friends. Here we report the first direct observation of a significant Happiness Paradox in a large-scale online social network of 39,110 Twitter users. Our results reveal that popular individuals are indeed happier and that a majority of individuals experience a significant Happiness paradox. The magnitude of the latter effect is shaped by complex interactions between individual popularity, happiness, and the fact that users strongly cluster by similar level of happiness. Our results indicate that the topology of online social networks, combined with how happiness is distributed in some populations, may be associated with significant psycho-social effects.

    PIAMV risico's bij hergebruik grond
    Slootweg, G. - \ 2017
    Lisse : Wageningen Plant Research , onderdeel van Wageningen University & Research, Business Unit Bloembollen, Boomkwekerij en Fruit - 21 p.
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