A. J. Koolen

Suitability of pre-compression stress as the real critical stress of unsaturated agricultural soils (2007)

Mosaddeghi, M.R., Koolen, A.J., Hajabbasi, M.A., Hemmat, A., Keller, T.

Comparisons of different procedures of pre-compaction stress determination on weakly structured soils (2007)

Mosaddeghi, M.R., Koolen, A.J., Hemmat, A., Hajabbasi, M.A., Lerink, P.

Technische richtlijnen ter preventie van schadelijke bodemverdichting (2005)

Tijink, F.G.J., Vermeulen, G.D., Koolen, A.J.

Simulation of oxygen regime of tree substrates (2005)

Balakina, J.N., Makarova, O.V., Bondarenko, V., Koudstaal, L.J., Ros, E.J., Koolen, A.J., ...

The oxygen regime of urban tree-growing sites may be sub-optimal for tree growth and the related ornamental value of trees. Problems may especially occur in situations where the substrate is covered...

Simulation of oxygen regime of tree substrates (2005)

Balakina, J.N., Makarova, O.V., Bondarenko, V., Koudstaal, L.J., Koolen, A.J.

The oxygen regime of urban tree-growing sites may be sub-optimal for tree growth and the related ornamental value of trees. Problems may especially occur in situations where the substrate is covered...

Soil precompression stress: II a comparison of different compaction tests and stress-displacement behaviour of the soil during wheeling (2004)

Keller, T., Arvidsson, J., Dawidowski, J.B., Koolen, A.J.

Precompression stress is often used as a criterion for soil susceptibility to compaction. The objective of this study was to compare precompression stresses derived from different compression test...

Pre-compression stress concept and physical qualities of soils from Central Iran (2003)

Mosaddeghi, M.R., Koolen, A.J.

Effects of internal and external forces on pre-compaction stress and air-premeability of fice soils from Central Iran (2003)

Mosaddeghi, M.R., Koolen, A.J.

FEM analysis of subsoil reaction on heavy wheel loads with emphasis on soil preconsolidation stress and cohesion (2003)

Poodt, M.P., Koolen, A.J., Linden, J.P.

Heavy sugarbeet harvesters may compact subsoil. But it is very difficult to study this by field experiments that resemble agricultural practice. Therefore, an analysis was made by a finite element...

Soil dynamics of the origination of soil tare during sugar beet lifting. (2002)

Vermeulen, G.D., Koolen, A.J.

High soil tare of sugar beet on wet clay soil after uprooting with share lifters is usually attributed to the fact that the soil becomes sticky due to mechanical impact during uprooting. Results of...

Sprinkling decisions derived from turf and weather information (2002)

Koolen, A.J.

Simulation of a soil loosening process by means of the modified distinct element method (2002)

Momuzu, M., Oida, A., Yamazaki, M., Koolen, A.J.

We apply the Distinct Element Method (DEM) to analyze the dynamic behavior of soil. However, the conventional DEM model for calculation of contact forces between elements has some problems; for...

Soil dynamics of the origination of soil tare during sugar beet lifting (2002)

Vermeulen, G.D., Koolen, A.J.

High soil tare of sugar beet on wet clay soil after uprooting with share lifters is usually attributed to the fact that the soil becomes sticky due to mechanical impact during uprooting. Results of...

Oxygen supply and consumption in soilless culture: evaluation of an oxygen simulation model for cucumber (2001)

Baas, R., Wever, G., Koolen, A.J., Tariku, E., Stol, K.J.

A soil oxygen simulation model (OXSI) was tested and evaluated for evaluating growing media with respect to aeration. In the model, local oxygen concentrations are calculated from coefficients of...

Dynamics and characteristics of pore space changes during the crumbling on drying of structured agricultural soils (2001)

Aluko, O.B., Koolen, A.J.

Test speed and other factors affecting the measurements of tree root properties used in soil reinforcement models (2001)

Cofie, P., Koolen, A.J.

Measured values of the mechanical properties of tree roots are found to be affected by a number of factors. Shear properties of tree roots are found to be partly influenced by size of the testing...

Organic matter in turfgrass rootzones (2001)

Wolleswinkel, A.P., Koolen, A.J., Bos, O.F.

Loading of tree roots by vehicles (2001)

Koolen, A.J., Cofie, P.

The essential mechanics of capillary crumbling of structured agricultural soils (2000)

Aluko, O.B., Koolen, A.J.

Measurement of stress-strain relationship of beech roots and calculation of the reinforcement effect of tree roots in soil-wheel systems (2000)

Cofie, P., Koolen, A.J., Perdok, U.D.

Pedotechnical activities : Scientific aspects and relevance in practice (2000)

Koolen, A.J.

Applicability of waste materials (a.o. compost, mine stone, gypsum) to vegetated civil surfaces (2000)

Koolen, A.J.

On the use of agricultural soil data required in soil deformation models (2000)

Koolen, A.J.

Zuurstofhuishouding van aangemaakte bomengrond onder verharding (2000)

Koolen, A.J., Sterken, T.M., Ros, E.J.

Oxygen regime of manufactured tree soil under pavements (2000)

Koolen, A.J., Sterken, T.M., Ros, E.J.

Meer werkbare dagen met grotere machines, zonder bodemschade (2000)

Perdok, U.D., Koolen, A.J.

Subsoil reaction on heavy wheel loads as affected by soil preconsolidation stress and cohesion. FEM results (2000)

Poodt, M.P., Koolen, A.J.

Research and development in urban forestry in The Netherlands (1999)

Couenberg, E.A.M., Konijnendijk, C.C., Koolen, A.J., Kopinga, J.

Applicability of waste materials (a.o. compost, mine stone, gypsum) to vegetated civil surfaces (1999)

Koolen, A.J.

Efficiënte Standplaatsen voor Straatbomen (1999)

Koolen, A.J.

On the use of agricultural soil data required in soil deformation models (1999)

Koolen, A.J.

Simulation of soil loosening process by pendulum type blade by means of modified distinct element method (1999)

Momozu, M., Oida, A., Yamazaki, M., Koolen, A.J.

Classification of vehicles with respect to their mobility on building sites (1999)

Vermaas, L.J., Koolen, A.J.

The Netherlands (1999)

Couenberg, E.A.M., Konijnendijk, C.C., Koolen, A.J., Kopinga, J.

Efficiente Standplaatsen voor straatbomen (1999)

Koolen, A.J.

Simulation of the effect of a vehicle pass on the oxygen regime of soil. (1998)

Stol, K.J., Koolen, A.J.

Transformation of three agricultural soil models into a model for the PLAXIS finite element code. (1998)

Koolen, A.J.

Axial stress-strain relationships of fine roots of Beech and Larch in loading to failure and in cyclic loading. (1998)

Makarova, O.V., Cofie, P., Koolen, A.J.

Introduction to symposium 19: construction and use of artificial soils. (1998)

Koolen, A.J., Rossignol, J.P.

Laboratory evaluation of physical-mechanical properties of manufactured tree soils. (1998)

Koolen, A.J.

The compactive action: initial conditions, modeling, and immediate effects. (1998)

Koolen, A.J.

Evaluatie van een bomenzand in het Spui te Den Haag. (1998)

Koolen, A.J.

Groeivoorspellingen voor Koningslindes in Het Spui te Den Haag. (1998)

Koolen, A.J.

Nieuwe rekenmethode voor beter advies. (1997)

Koolen, A.J.

Metingen en berekeningen van spanningen in de bodem onder enkele banden. Onderzoek in opdracht van Terra Care, Ommen. (1997)

Koolen, A.J.

Evaluatie van een halfrups. Een deskundig onderzoek voor de Arrondisementsrechtbank Assen. Zaak 3440, vonnis 11/2/97. (1997)

Koolen, A.J.

Onderzoek n.a.v. de zetting na herprofilering van de Kapelstraat te Kerkrade in opdracht van de Nationale Bomenbank bv. te Sliedrecht. (1997)

Koolen, A.J., Couenberg, E.A.M.

Beproeving van enkele typen bomenzand. Onderzoek in opdracht van de Nationale Bomenbank bv. te Sliedrecht. (1997)

Koolen, A.J., Couenberg, E.A.M.

Proprietés du sol de trois terrains mesurés sous des regimes d'irrigation controlés. (1997)

Koolen, A.J., Versteeg, F.

Simulation of the effect of a vehicle pass on the oxygen regime of soil. (1997)

Stol, K.J., Koolen, A.J.

Transformation of three agricultural soil models into a model for the PLAXIS finite element method. (1997)

Koolen, A.J.

Fracture behavior of a cohesive soil under crushing stress loading. (1996)

Ashenavi, T.A., Koolen, A.J.

Simulation of turf hydrology with SWIM. (1996)

Koolen., A.J., Wolleswinkel, A.P., Versteeg, F.

Towards inclusion of soil reinforcement by plant roots in soil-vehicle mechanics. (1996)

Koolen, A.J.

Mechanics of soil compaction. (1994)

Koolen, A.J.

Strength of substrates in urban horticulture in Amsterdam. (1994)

Koolen, A.J.

Soil-machine relations. (1994)

Koolen, A.J.

Permanent root media. (1994)

Koolen, A.J.

Computerized determination of the preconsolidation stress in compaction testing of field core samples. (1994)

Dawidowski, J.B., Koolen, A.J.

Stress transmission in forest soils and the reinforcing effect of roots. (1994)

Heij, W., Koolen, A.J.

Stress transsmission in forest soils and the reinforcing effect of roots. (1994)

Heij, W., Koolen, A.J.

Comparison of stresses, compactions and increase of penetration resistances caused by a low ground pressure tyre and a normal tyre. (1994)

Arts, W.B.M., Koolen, A.J., Stuiver, H.J.

Overzicht van de onderzoeken die door de Landbouwuniversiteit, i.s.m. de gemeente Amsterdam, op het gebied van bomengrond zijn verricht. (1993)

Koolen, A.J.

Pedotechnique and applications: mechanics of wet soil flow, mapping virgin clay soils, predicting processes in arable and dikes topsoils. (1993)

Koolen, A.J.

The influence of roots on stress transmission in forest soils. (1993)

Heij, W., Koolen, A.J.

The influence of roots on stress transmission in forest soils. (1993)

Heij, W., Koolen, A.J.

Prediction of aspects of soil-wheel systems. (1992)

Koolen, A.J., Lerink, P., Kurstjens, D.A.G., Arts, W.B.M.

A simple formula is given which predicts maximum stress-depth relationships under wheels from vertical wheel load and the tyre inflation pressure. Predictions were compared with stress measurements...

Talud tussen percelen Landgraaf P-40 en Landgraaf P-42. (1992)

Koolen, A.J., Spaan, W.P.

Fysische eigenschappen van zand- en broadleaf mengsels met en zonder bovenbelasting. (1992)

Koolen, A.J., Peelen, B.W.

Talud tussen de percelen Landgraaf P-40 en Landgraaf P-42, E-498. (1991)

Koolen, A.J., Spaan, W.

Stadsbomen en bodemverdichting. (1991)

Ros, E., Koolen, A.J.

Controlled distortion of soil samples with reference to soil physical effects. (1990)

Dawidowski, J.B., Lerink, P., Koolen, A.J.

Strategies to avoid or to reduce detrimental impacts: working techniques for avoiding damage. (1990)

Koolen, A.J.

Voertuigbodemdruk en bodemverdichtingsweerstand. (1990)

Koolen, A.J.

Adjusted soil handling techniques in sustained agriculture. (1990)

Koolen, A.J.

Future research needs in soil compaction. (1990)

Schafer, R.L., Johnson, C.E., Koolen, A.J., Gupta, S.C., Horn, R.

Banden tussen voertuig en grond. (1990)

Tijink, F.G.J., Koolen, A.J., Arts, W.B.M.

Nato advanced research workshop on mechanics and related processes in structured agricultural soils. (1989)

Koolen, A.J.

Interface between implements, tillage and soil structure. (1989)

Kuipers, H., Koolen, A.J.

Agricultural engineering under the aspect of properties of soil. (1989)

Koolen, A.J.

Pedotechnique-inventory of predictive methods and unlocking of relevant input data. (1988)

Koolen, A.J.

Pedotechnique - soil classification, soil mechanics and soil handling. (1988)

Koolen, A.J.

Pedotechnique - a modern approach to present-day problems in soil handling and field traffic. (1988)

Koolen, A.J.

Summation of shear deformation in stream tubes in soil under a moving tyre. (1988)

Tijink, F.G.J., Lerink, P., Koolen, A.J.

9th ISTVS Conference in Barcelona. (1988)

Koolen, A.J., Perdok, U.D.

Changes of soil water suction, conductivity, and dry strength during deformation of wet undisturbed samples. (1987)

Dawidowski, J.B., Koolen, A.J.

Werkbaarheidsgrenzen en hun bodemfysische achtergrond. (1987)

Koolen, A.J., Boekel, P., Perdok, U.D.

Deformation and compaction of elemental soil volumes and effects on mechanical soil properties. (1987)

Koolen, A.J.

Measuring traffic-induced stresses at the interface of soil layers of contrasting stiffness. (1987)

Koolen, A.J.

Agricultural soil mechanics. (1986)

Koolen, A.J., Kuipers, H.

Behaviour of elemental soil volumes in compaction and effects on properties of significance in soil use. (1986)

Koolen, A.J.

Book review: Vehicle traction mechanics, by R.N. Young, E.A. Fattah and N. Skiadas (eds.). (1986)

Koolen, A.J.

Prediction of tire rolling resistance and soil compaction, using cone, shear vane, and a falling weight (1985)

Tijink, F.G.J., Koolen, A.J.

Processen die in de grond optreden bij diepe grondbewerkingen (1985)

Koolen, A.J.

Relationships between soil mechanical properties (1984)

Koolen, A.J., Vaandrager, P.

Vijfentwintig jaar gronddynamica in de landbouw, van verkennig naar toepassingen (1984)

Koolen, A.J.

Considerations concerning the surface of contact between soil and vehicle running gear (1983)

Koolen, A.J.

Agricultural Soil Mechanics (1983)

Koolen, A.J., Kuipers, H.

Agricultural Soils Mechanics (1983)

KOOLEN, A. J.

Precompaction stress determination on precompacted soil (1982)

Koolen, A.J.

Remote sensing of surface roughness and top soil moisture of bare tilled soil with an X-band radar (1979)

Koolen, A.J., Koenigs, F.F.R., Bouten, W.

Temperatuurbeelden van onbegroeide grond (1979)

Koolen, A.J.

The influence of a soil compaction process on subsequent method (1978)

Koolen, A.J.

Soil loosening processes in tillage. An analysis, systematics and predictability (1977)

Koolen, A.J.

De invloed van de mechanisatie op de bodemstructuur, belicht vanuit de gronddynamica (1976)

Koolen, A.J.

Mechanical properties of precompacted soil as affected by the moisture content at precompaction (1976)

Koolen, A.J.

Wrijvingseigenschappen van de grond (1976)

Koolen, A.J.