181,137 research outputs found
Populus euramericana 'Koster'
No full textDe populierekloon 'Koster' is een nieuwe selectie die vanuit De Dorschkamp door de Rassenlijstcommissie is uitgegeven. De moeder van de kloon is een P. deltoides uit de USA, de vader een P. nigra 'Vereecken' uit Nederland. De nieuw ontstane kloon uit deze kruising is genoemd naar ir. R. Koster, die gedurende meer dan 20 jaar heeft gewerkt aan populierenveredelin
W. J. W. Koster, Naar Aanleiding van het Communisme bij Aristophanes en Plato
No full textvan Pottelbergh R. W. J. W. Koster, Naar Aanleiding van het Communisme bij Aristophanes en Plato. In: L'antiquité classique, Tome 25, fasc. 1, 1956. p. 177
W. J. W. Koster, Naar Aanleiding van het Communisme bij Aristophanes en Plato
No full textvan Pottelbergh R. W. J. W. Koster, Naar Aanleiding van het Communisme bij Aristophanes en Plato. In: L'antiquité classique, Tome 25, fasc. 1, 1956. p. 177
Integrated storage-order picking systems: Technology, performance models, and design insights
No full textIn many warehouses shuttle-based technologies have replaced the traditional AS/R system based storage technologies. The impact these systems have on downstream order picking performance is largely unknown. To study the interactions between upstream storage and downstream picking systems, we develop a novel analytical model for integrated storage and order picking systems. The resulting semi-open queuing model is solved using the matrix-geometric method. Using the queuing network model, we are able to study the effect of storage system technology on order throughput times, and the effect of the picking station input buffer size on order picking performance. Further, we analyze the effect of a constant work-in-process (CONWIP) control for orders on system performance. Our results indicate that using SBS/R instead of AS/R-based storage systems yields investment cost savings (i.e., fewer aisles in the storage area and fewer picking stations), paired with a lower total throughput time at a given order arrival rate. Numerical studies show how the total throughput time, first, benefits and then becomes stable by increasing the input buffer size at the picking stations. Retrieving item tote at the storage system in advance with respect to the picker availability is also advantageous, especially in the SBS/R system. (C) 2018 Elsevier B.V. All rights reserved
sj-R-3-eup-10.1177_14651165221101505 - Supplemental material for Support for European Union membership comes in various guises: Evidence from a Correlational Class Analysis of novel Dutch survey data
No full textSupplemental material, sj-R-3-eup-10.1177_14651165221101505 for Support for European Union membership comes in various guises: Evidence from a Correlational Class Analysis of novel Dutch survey data by Elske van den Hoogen, Stijn Daenekindt, Willem de Koster and Jeroen van der Waal in European Union Politics</p
Mangrove root biomass and the uncertainty of belowground carbon estimations
No full textMangroves sequester large amounts of carbon (C) and they are increasingly recognized for their potential role in climate change mitigation programs. However, there is uncertainty in the C content of many mangrove forests because the amount of C stored in the roots is usually estimated from allometric equations and not from direct field measurements. There are only a handful of allometric equations in mangroves that are used worldwide to estimate root biomass, however, root biomass can vary from the allometric relationship if the environmental conditions are different from those where the equation was developed. In this study, we compiled recent information on how mangrove roots are affected by environmental conditions. Then, we explored the effect of sampling methodology on root biomass estimations. Finally, we compared published values of root biomass from field measurements against our estimations from allometric equations. The goal was to calculate the uncertainty associated with the estimation of root biomass and thus, the belowground C content of mangroves. The results showed that sampling methodology has a significant effect on root biomass estimations. The highest biomass estimations are reported where both live and dead roots are measured and when the roots are sampled by digging trenches. When comparing measured values against estimations from allometric equations, on average the general allometric equation provided root biomass values that were 40 ± 12% larger than those obtained from field measurements with cores. The result suggests that either: (a) sampling with cores largely underestimates root biomass, or (b) allometric equations overestimate root biomass when used outside the region where they were developed. The uncertainty in root biomass estimates from allometric equations corresponds to 4–15% of the ecosystem C stock (trees + soil), with higher uncertainties in forests with low tree density and low interstitial salinity. We provide a statistical model that includes salinity, forest density and root biomass to correct for this systematic bias. The estimated uncertainty is important to consider when quantifying C budgets at large spatial scales and to validate methodological approaches to C stock estimations.Full Tex
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Rest-related dynamics of risk and protective factors for depression: A behavioral study
No full textResting state provides an important condition to study depressogenic cognition because neuropsychological studies have indicated that rest is associated with heightened self-related processing. We examined relationships between rest-related internal focus, cognitive reactivity (vs. mindfulness), rumination, and negative mood outside the functional magnetic resonance imaging scanner in an undergraduate sample (N = 80). We tested a theory-based effect by which, in the presence of cognitive risk (vs. protective) factors, internal focus lowers mood via ruminative self-focus. Such an effect was detected in individuals with high cognitive reactivity, whereas brooding showed only an incremental effect. However, this dynamic was not significant in individuals with low cognitive reactivity, despite the level of brooding, or high mindfulness. These results provide an important window on risk for depressogenic thought during resting state. © The Author(s) 2013
Broways (R.) et Koster (W.). — Etude d’aménagement de la hauteur du plan de travail du continu à filer. Bull. Cerp. 1961, n° 2, pp. 117-129
No full textTurbiaux Marcel. Broways (R.) et Koster (W.). — Etude d’aménagement de la hauteur du plan de travail du continu à filer. Bull. Cerp. 1961, n° 2, pp. 117-129. In: Bulletin de psychologie, tome 20 n°252, 1967. p. 116
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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