Pieter Musters

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Papers by Pieter Musters

Spatio-temporal kriging of soil water content

... Pebesma, EJ (1996), Gstat-a Program for Geostatistical Modelling, Prediction and Simulation. ... more

Towards the understanding of forest root profiles

New J Chem, 1997

Temporal and Spatial Patterns of Root Water Uptake in an Austrian Pine Stand on Sandy Soil

The identification of an effective rooting depth from sap flow dynamics with a neural network model

Potentials and limitations of modeling vertical distributions of root water uptake of an Austrian pine forest on a sandy soil

Optimising soy sauce quality by linking flavour composition with consumer preference

Developments in Food Science, 2006

The molecular basis of preference was investigated for Chinese soy sauce by combining identificat... more The molecular basis of preference was investigated for Chinese soy sauce by combining identification of key flavour compounds with sensory and consumer studies. Based on the results, routes were explored to avoid off-flavour generation during fermentation and to optimise the composition of the final blend.

Assessing rooting depths of an austrian pine stand by inverse modeling soil water content maps

Water Resources Research, 1999

Rooting depths in a forested stand (0.11 ha) were estimated indirectly by inverse modeling maps o... more Rooting depths in a forested stand (0.11 ha) were estimated indirectly by inverse modeling maps of soil water contents from time domain reflectometry (TDR) measurements at 150 points. These maps were described with a calibrated one-dimensional soil water flow model, with specific values for the rooting depth, van Genuchten&amp;#x27;s [1980] alpha parameter, and throughfall fraction at each point. At about

Minority Game of price promotions in fast moving consumer goods markets

Physica A: Statistical Mechanics and its Applications, 2005

A variation of the Minority Game has been applied to study the timing of promotional actions at r... more A variation of the Minority Game has been applied to study the timing of promotional actions at retailers in the fast moving consumer goods market. The underlying hypotheses for this work are that price promotions are more effective when fewer than average competitors do a promotion, and that a promotion strategy can be based on past sales data. The first assumption has been checked by analysing 1467 promotional actions for three products on the Dutch market (ketchup, mayonnaise and curry sauce) over a 120-week period, both on an aggregated level and on retailer chain level.

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A method for identifying optimum strategies of measuring soil water contents for calibrating a root water uptake model

Journal of Hydrology, 2000

Measurements of soil water contents, such as with Time Domain Reflectometry (TDR) are essential t... more Measurements of soil water contents, such as with Time Domain Reflectometry (TDR) are essential to calibrate models that estimate the vertical distribution of root water uptake by simulating the unsaturated flow of soil water. This study presents a method to determine how the number of TDR probes used, their orientation and depth of installation affect uncertainties in calibrating a Root Water Uptake Model (SWIF); thus the suggested method identifies optimal placement of TDR sensors for the calibration of a root water uptake model.

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Social interaction and low involvement products

Journal of Business Research, 2007

Psychological and economic market models generally mainly concentrate on single individuals rathe... more Psychological and economic market models generally mainly concentrate on single individuals rather than taking their social interactions into account. This study targets social interaction in one specific domain: everyday food products. The aim is to find out whether these products are all low in involvement (as assumed before) and if social influence is a factor that contributes to the purchase decision. This study has found considerable differences in involvement among different food products. The authors also discovered differences in the susceptibility to informative social influence as well as in the size of different networks. Both findings have consequences for modeling: Firstly, when modeling the interactions among consumers one has to take the product into account. Secondly, if one can find different degrees of involvement, chances are that involvement is not the only variable that influences consumer-consumer interaction. The results suggest a need for further research on the visibility of products.

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Sensory and Chemical Changes in Tomato Sauces during Storage

Journal of Agricultural and Food Chemistry, 2002

The present work aimed to identify the key odorants of tomato sauces responsible for the flavor c... more The present work aimed to identify the key odorants of tomato sauces responsible for the flavor change during storage. Products made from paste or canned tomatoes were stored at 25 and 40°C. Sensory properties and quantification of the key odorants were measured and correlated. Significant sensory changes appeared after 1 and 3 months at 25°C in the respective dice and paste sauces (p < 0.01). The dice sauce was characterized by a steep loss of the sensory quality during the early storage and then by identical changes within the same time span at 25 and 40°C. In the paste sauce the sensory deterioration was slower than for the dice sauce and occurred more extensively at 40°C than at 25°C. Correlation between sensory and instrumental data revealed that the source of sensory changes should be (E,E)-deca-2,4-dienal in the dice sauce. The sensory change in the paste sauce could be due to acetaldehyde, methylpropanal, 3-methylbutanal, oct-1-en-3-one, 3-methylbutanoic acid, deca-2,4-dienal, 2-methoxyphenol, and -damascenone. 12, 14, and 16 weeks at 40°C. For each time/temperature combination some glass jars were taken out and frozen for later aroma and sensory analyses.

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Potentials and limitations of modelling vertical distributions of root water uptake of an Austrian pine forest on a sandy soil

Hydrological Processes, 2000

Root water uptake patterns are often studied with simulation models of the unsaturated soil water... more Root water uptake patterns are often studied with simulation models of the unsaturated soil water¯ow, as they are dicult to measure directly. Calibration of these models is not straightforward and causes uncertainties in simulated uptake distributions. In this paper we study how uncertainties in the calibration of the SWIF model aect uncertainty intervals in simulated uptake patterns of an Austrian pine stand (Pinus nigra var. nigra) on a sandy soil. After calibrating and validating SWIF with a large data set of more than 125 000 measured soil water contents over a three year period, uncertainty ranges in simulated soil water dynamics and root water uptake distributions were estimated with a Monte Carlo analysis.

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Text analysis of open-ended survey responses: a complementary method to preference mapping

Food Quality and Preference, 2003

The present study illustrates the use of computer-aided text analysis to evaluate the content of ... more The present study illustrates the use of computer-aided text analysis to evaluate the content of open-ended survey responses. During an in-hall test, different varieties of mayonnaise were evaluated by 165 respondents on a 10-point liking scale, with the option to freely comment on these assessments. An expert panel assessed the main sensory characteristics of the mayonnaises. Usually, preference mapping is applied to find out which sensory attributes drive consumer preferences for products. As an alternative, we will use the consumer statements to investigate this relationship. By counting words and looking at word combinations, we will use correspondence analysis to construct a visualization that is comparable to a preference map. Results from the analyses of the verbal responses are compared with the results from preference mapping. The agreement between the correspondence map and the preference map is striking, with the additional advantage being that the correspondence map is stated in terms of consumer language. The textual map is also in line with consumer understanding about creaminess. It appears that respondents find it easier to comment on their dislikes than on their likes. Some advantages and disadvantages of analyzing open-ended survey responses are also addressed. #

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Temporal dynamics of spatial patterns of water uptake

Transpiration dynamics of an Austrian Pine stand and its forest floor: Identifying controlling conditions using artificial neural networks

Advances in Water Resources, 2002

In this study, artificial neural network analyses (ANN) were used to identify the forcing environ... more In this study, artificial neural network analyses (ANN) were used to identify the forcing environmental variables that are most significant in governing the transpiration rates of an Austrian Pine stand and its forest floor. Latent heat flux densities (Lh) of the Austrian Pine stand and its forest floor were separately measured using the eddy covariance technique. To assess the sensitivity of the ANNs to input information on the soil water status, the site calibrated soil hydrological model SWIF was used to compute average volumetric soil water contents of different depth intervals. Results show that forest floor transpiration dynamics can be adequately modelled using the global radiation reaching the forest floor and the topsoil water content (0-50 cm). The response functions of the total forest and forest floor showed a clear difference in sensitivity of latent heat fluxes to global radiation, air temperature and soil water content. Most significantly, results demonstrate that the presented ANN analysis is suited for assessing effective rooting depths from measured transpiration rates and soil water contents. Ó

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Optimising soy sauce quality by linking flavour composition with consumer preference

Developments in Food Science, 2006

Pieter Musters

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