Cytotaxonomic Position of <i>Crotalaria Brownei</i> Bert. ex DC

Cis Schut Bert Bredeweg

Constructing a qualitative model of some device usually proceeds as a cycle of model formulation and model debugging . The latter is driven by discrepancies between the behaviour predicted by the model and the actual device behaviour. This paper describes how the elimination of one type of discrepancy, incorrectly predicted derivatives, can be supported . It provides an analysis of the knowledg...

My friend Bert.

It had been a busy morning in the hospital with surgeries, rounds, and outpatient department visits. I enjoyed the few minutes of solitude as I drove to the nursing home to see my friend Bert. He sat, slouched over, in a geriatric chair and ever so slowly sat up when I spoke to him. His expressionless face could no longer welcome me, yet his trembling hands reached out to grasp mine. I sat clos...

Bioactive furanoeremophilanes from Senecio otites Kunze ex DC.

The furanoeremophilanes 6 beta-angeloyloxy-1,10-dehydrofuranoeremophilan-9-one (1), 6 beta-hydroxy-1,10-dehydrofuranoeremophilan-9-one (2) and 6 beta-propionyloxy-1,10-dehydrofuranoeremophilan-9-one (3) were isolated from Senecio otites, their structures elucidated by spectral analyses, and their insecticidal and phytotoxic properties evaluated. Compounds 1-3 proved to be effective aphid antife...

Robust Position Control of a DC Motor by Sliding Mode

The position of the DC motor is controlled by using a continuous sliding mode control (SMC), which is highly robust to the Coulomb friction torque and to high unknown payload variations, which involve changes in the rotational inertia of the motor shaft. The main contribution of the work is the experimentation of a SMC control which does not requires the knowledge of the payload variation range...

Henk Ten Have & Bert Gordijn