PV
P.J.T. Verheijen
144 records found
1
...
Authored
Attrition tests have been performed on an aluminate-based synthetic sorbent intended for regenerative sulphur capture from flue gas in a fluidised bed coal combustor. A comparison with lime(stone) has also been made. Single-particle crushing strength tests have been used to inves
...
The Particle Technology Group at Delft University of Technology is developing an instrument for on-line, real-time measurement of size and chemical composition of individual aerosol particles. Particles are sampled from an aerosol by using aerosol beam techniques. Collimated by t
...
The development of an on-line aerosol analysis instrument, making use of laser pyrolysis and T.O.F. mass spectroscopy, requires a particle beam generator to introduce the particles in the ionization chamber. The results of previous investigators and theoretical models have been u
...
A numerical computer simulation has been developed for the electrostatic spray paint process. The theoretical model describes the path of a cloud of charged drops. It takes into account the drop size, temperature, density, viscosity of paint and air, charge of the drops, potentia
...
In vivo distribution of hydrocortisone over whole blood
A novel method for the extraction of erythrocytes
Ten mg hydrocortisone (HC) was administered intravenously to a healthy volunteer after a dexamethasone suppresion test and HC concentrations were determined from 1-270 min in plasma, plasma water and on erythrocytes. HC was extracted from erythrocyte concentrates with high effici
...
Application of the Fast Fourier Transform (FFT) to the inversion of Laplace transforms is a recent development in the solution of the equations describing the behavior of chemical reactors. Chen and Hsu (1987) used the Fast Fourier Transform for the prediction of breakthrough cur
...
Differential cross sections for proton elastic scattering from 42,44,48Ca have been measured at seven energies in the laboratory energy range from 21.0 to 48.4 MeV, and for Ca40 at six energies between 25.0 and 45.0 MeV. Measurements were made at 2.5°intervals from 10°to 90°(labo
...
Four major fracture zones cutting the Atlantic sea floor off the west coast of Africa-St Paul's, Romanche, Chain and Charcot- have been delineated offshore using bathymetrie, seismic, gravity and magnetic data, respectively 1. But the extrapolation of these fractures onto the Afr
...
A polarized He3 target, which uses conventional optical pumping with He4 discharge lamps, has been used for the measurement of He3 analyzing powers Ay(θ) at energies of 25.0, 30.0, 32.5, and 35.0 MeV. The statistical uncertainties in the data are on the order of 0.03; the systema
...
Differential cross sections for He3(p,p)He3 elastic scattering have been measured at 11 energies in the laboratory energy range 19.5 to 47.5 MeV. The most forward c.m. angle for the angular distributions varies from 10.1°to 13.4°, and the most backward angle varies from 163.2°to
...
A polarized 3He target, which uses conventional optical pumping with 4He discharge lamps, is described. Emphasis is given to the experience gained with its use during nuclear scattering experiments using proton beams from the University of Manitoba cyclotron. An analysis of possi
...
The evolution of a plume trace which constitutes the granitic intrusives in the Hoggar, Air, Zinder and the Jos plateau regions has been analyzed using geochronological and topographic data. The trace location is consistent with the idea of the African plate rotating around a pol
...
Abstract: Echocardiograms, systolic time interval measurements and electrocardiograms were obtained before treatment of 15 Nigerian patients with severe hypertension (WHO stage 2) but without overt heart failure. These were compared with the measurements in 12 normo‐tensive cont
...
We present an analysis of errors contributing to the inaccuracy of aneroid altimeter observations under tropical conditions. Instrumental errors were investigated experimentally, while errors due to meteorological factors were analyzed using an autocorrelation analysis of actual
...
Geophysics at graduate level
A third-world experience
The circumstances in third-world countries are such that in the teaching of physics special emphasis has to be placed on practicality, flexibility, and broadness. This article describes the incorporation of these considerations into an Applied Geophysics MSc programme in Nigeria.
...
A geophysical investigation has been made of a small pipe, suspected to be kimberlite, in northern Nigeria, which is associated with pipes in Mali and the Central African Empire. Detailed interpretation of the gravity and magnetic data determined the structure to a depth of 0.5 k
...
The result of some temperature gradient measurements in available boreholes, located in the centre of the Nigerian Ririwai complex gave a heat flow of 0.92 ± 0.04 hfu. This result agrees with that of the worldwide averages for Precambrian shield areas but compared with the mean f
...
Measurements were made with a Lacoste-Romberg gravimeter G 88, along the Jos-Zaria-Sokoto and Zaria-Kano roads in order to establish a calibration line along which the constants of other gravimeters in Nigeria could be checked. Starting from the IGSN 7228J base station in Kano, t
...