Le développement durable

Conference given outside the academic context (2002)

Comparaison des cahiers des charges de filières de production porcine sous « signe de qualité » en Région wallonne.

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2002), 6(4), 221-230

Agriculture et environnement: nitrates, permis d'environnement, écobilan, ...

Scientific conference (2001, March 06)

Les flux d'azote mobilisés par les agricultures belges

in Bulletin d'Information (Association Royale des Ingénieurs Issus de la Fusagx - Aigx) (2001), 4

Les flux de matières azotées mobilisés par les exploitations agricoles sont identifiés et quantifiés par divers modèles mathématiques. Ceux-ci sont conçus de manière à pouvoir être appliqués tant au ... [more ▼]

Les flux de matières azotées mobilisés par les exploitations agricoles sont identifiés et quantifiés par divers modèles mathématiques. Ceux-ci sont conçus de manière à pouvoir être appliqués tant au niveau d'une exploitation agricole qu'au niveau d'un territoire déterminé. Après avoir décrit succinctement ces modèles, leurs caractéristiques et leurs limites, le résultat de leur application aux agricultures flamande et wallonne est présenté. Il met en évidence une différence importante entre ces deux agricultures, notamment quant à leurs responsabilités environnementales. Les flux d'azote mobilisés par des exploitations agricoles existantes sont également estimés. Ils illustrent la grande diversité de comportement d'exploitations agricoles apparemment semblables. [less ▲]

Flow rate quality of new flat fan nozzles

in Transactions of the ASAE (2001), 44(4), 769-773

Manufacturers of spraying nozzles have established manufacturing tolerances to guarantee the quality of their products. They control, among other things, the new nozzles’ flow rate by comparison with the ... [more ▼]

Manufacturers of spraying nozzles have established manufacturing tolerances to guarantee the quality of their products. They control, among other things, the new nozzles’ flow rate by comparison with the nominal flow rate. When the deviation exceeds a set limit, the nozzles are rejected. A survey carried out among three manufacturers made it possible to determine the manufacturing tolerances and limits that manufacturers impose upon themselves. The flow rates of 1565 new nozzles collected on the market from these manufacturers were measured on a device developed for this study. Different statistical tests assessed the performances and characteristics of the products. The quality standards announced by the manufacturers were not checked for every nozzle. On average, 20% of the new nozzles exceeded the manufacturing tolerances. The average flow rate of the nozzle sets equalled the nominal flow rate. In practice, the probability distribution of the flow rate of new nozzles should be normal. The dispersion of the new nozzle flow rates was slightly higher than the theoretical one. The quality of the products differed from one manufacturer to another. [less ▲]

Comparison by image processing of target supports of spray droplets

in transaction of the American society of Agricultural engineers (2001), 44(2), 217-222

L'écobilan de l'exploitation agricole

Scientific conference (2000, October 16)

Evaluation environnementale de l'agriculture

Scientific conference (2000, March 03)

Characterization of the erosive power of the suspension used within the framework of accelerated wear tests of spraying nozzles.

in Mededelingen van de Faculteit Landbouwkundige en Toegepaste Biologische Wetenschappen (Rijksuniversiteit te Gent) (2000), 65(2b), 907-918

The study concerns the application techniques of agrochemical products and especially focuses on the wear of spraying nozzles. This one leads to a modification of the spraying characteristics and the ... [more ▼]

The study concerns the application techniques of agrochemical products and especially focuses on the wear of spraying nozzles. This one leads to a modification of the spraying characteristics and the homogeneity of distribution deteriorates. An accelerated wear process of nozzles is defined by the standard ISO 5682-1, which makes it possible to compare the wear resistance of the different nozzles available on the market. In order to accelerate the process, an erosive suspension is used in the test rig, but this suspension looses its characteristics during the utilisation time. This is the reason why a system measuring continuously the erosive power has been set up. This system is validated by different discontinuous measurement and the correlation observed have a coefficient of about 0,99. From the signal detected by the new device, two calculations have been carried out. A first one determining continuously the total wear quantity of the nozzles. A second one identifying continuously the erosive power of the suspension. On the one hand, we obtain a basis allowing to compare the wear resistance of nozzles and on the other hand, a parameter indicating the appropriate time to change the suspension. [less ▲]

Simulated And Measured Coefficients Of Variation For The Spray Distribution Under A Static Spray Boom

in Journal of Agricultural Engineering Research (2000), 76(4), 381-388

The spray pattern characteristics of a number of different series of flat fan nozzles were investigated in two ways. The first method was to measure the distribution by means of a classic patternator with ... [more ▼]

The spray pattern characteristics of a number of different series of flat fan nozzles were investigated in two ways. The first method was to measure the distribution by means of a classic patternator with collecting cylinders. The second method consisted of numerical simulation of the distribution, by combining the real distributions of a number of nozzles. The real distribution was measured on a classic patternator for each nozzle separately. The numerical simulation is computerized and automated. This system allows both time and labour gains, and permits multiple trials with the same series of nozzles. Numerical simulation results are compared with spray distributions obtained on the patternator. The sprayed volumes of liquid were found to be significantly different from the simulated ones (level of significance 95%). However, the coefficient of variation characterizing the homogeneity of the spread volumes can be calculated using simulated volumes. This can be done once an empirical linear relation is established between the coefficients of variation obtained from simulated volumes and the ones obtained from measured volumes. [less ▲]