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Now showing items 1-20 of 205

Amplification of acoustic phonons in superlattice

Dompreh, K.A.; Mensah, S.Y.; Mensah, N.G.; Abukari, S.S. (University of Cape Coast, 1970)

The amplification of acoustic phonons in a superlattice in the presence of an electric field cos( ) has been investigated theoretically and numerically by computational methods. The calculation is done in the hypersound ...
Studies of alpha particle registration in lr-115 type iiStudies of alpha particle registration in lr-115 type ii a solid state nuclear track detector a solid state nuclear track detector

Cwar, M. F.; Geraldo, L. P. (University of Cape Coast, 1981)

The experimental condition for use of the cellulose nitrate film LR-115 type II as alpha pa»tide detector? It was verified that the film* efficiency it • function of the alpha particle energy and etching conditions. The ...
Opto-electronic system for displacement and vibration measurements

Francini, F.; Macchiarulo, M.; Tiribilli, B.; Buah-Bassuah, P. K. (University of Cape Coast, 1987)

A device capable of measuring small displacements ~nd vibrati~ns o~ a n:oving body is .presented. A small mirror, firmly attached to the object unde~ mv.eStlgatlOn, defiect~ a paIr ~~laser beams onto two distinct photodetectors. ...
Hypersound absorption of acoustic phonons in a degenerate carbon nanotube

Shmelev, G M; Mensah, S Y; Tsurkan, G I (University of Cape Coast, 1988)

Short-wave sound absorption propagating along the axis of a semiconductor superlattice by electrons of the lowest miniband in a non-quantised electric field is investigated theoretically. The mechanism of the attenuation ...
An experimental investigation of the break-up of a liquid drop falling in a miscible fluid

Arecchi, F. T.; Buah-Bassuah, K.; Perez-Garcia, Francini C.; Quercioli, F. (University of Cape Coast, 1989)

A liquid drop falling in a lighter miscible fluid either undergoes a cascade of fragmentations, each appearing as a dynamic instability, or it mixes by diffusion, depending on the value of a fragmentation number F. F is ...
The thermoelectric effect in a semiconductor superlattice in a non-quantized electric field

Mensah, S Y; Kangah, G K (University of Cape Coast, 1991)

The thermoelccvic effect in a semiconductor rupcrlatlicc in a non-quantized electric Beld is investigated for elections of the lowest muband in the Linear approamation of VT. nalytlcll expressionsfor the thermopower ...
Fragment formation in the break-up of a drop falling in a miscible liquid

Arecchi, F. T.; Buah-Bassuah, P. K.; Perez-Garc, C. (University of Cape Coast, 1991)

When falling in a lighter miscible solvent, a drop of liquid deforms to a torus which then breaks up into several fragments or just disappears by diffusion. By using liquids of different compositions we show the universal ...
Amplification of acoustic waves due to an external temperature gradient in super lattices

Mensah, S Y; Kangah, G K (University of Cape Coast, 1991)

Amplification of short-wave sound propagating along the axis of a semiconductor super lattice by electrons of the lowest mini band in an external temperature gradient is investigated theoretically. The mechanism of absorption ...
The negative differential effect in a semiconductor superlattice in the presence of an external electric field

Mensah, S Y (University of Cape Coast, 1992)

Bollzmann's equation is solved for an clectmn m lhe lowest miniband of a superlattice semiconductor under the influence of an fxlemal electric field E(t). The currentdensity electric field characteristic shows a negalive ...
Effect of effective mass differences on the tunneling current-voltage behaviour of a resonant diode in the presence of space charge build-up

Sigalo, F.B.; Mensah, S.Y. (University of Cape Coast, 1992)

A theoretical study of the effect of differences in effective masses for electrodes and well, on the characteristics of tunneling current against bias voltage, in the presence of charge build-up has been done. It is observed ...
Effect of high frequency field on the transport properties of superlattice

Mensah, S.Y. (University of Cape Coast, 1992)

Theoretical study of the transport properties of semiconductor superlattice (SL) in the presence of external electric field E{t) has been investigated with the help of Boltz mann's equation. The model adopted agrees fairly ...
Effect of ionization of impurity centres by electric field on the conductivity of superlattice

Mensah, S.Y.; Allot, F.K.A.; Clement, A. (University of Cape Coast, 1994)

The study of the effect of ionization of impurity centres by electric field Ea on the conductivity of superlattice (SL) has been studied theoretically. It is observed that as the field Eo increases the current rises reaches ...
Soliton excitation in superlattice

Mensah, S.Y.; Allotey, F.K.A.; Mensah, N.G.; Twum, A.K. (University of Cape Coast, 1995-10)

Excitation of soliton in superlattice has been investigated theoretically. It is noted that the soliton velocity u and the length L depend on the amplitude Eo and that an increase in the amplitude causes soliton width L ...
Fragmentation of a drop as it falls in a lighter miscible fluid

Arecchi, F. T.; Buah-Bassuah, P. K.; Francini, F.; Residori, S. (University of Cape Coast, 1996)

We report an experimental investigation of the fragmentation process of a heavy drop falling in a lighter miscible fluid. For fixed liquid composition and for different drop sizes, we observe that the fragmentation cascade ...
Light scattering investigation of amphiphile and polymer adsorption on the surface of colloidal particles with low optical contrast

Piazza, R.; Eghan, M.J.; Peyre, V.; Degiorgio, V. (University of Cape Coast, 1998)

We have exploited the peculiar optical properties of fluorinated polymer colloids, which have a very low refractive index and a partially crystalline internal structure, to obtain accurate adsorption isotherms by combining ...
Soil textural classification by a photosedimentation method

Buah-Bassuah, Paul K.; Euzzor, Stefano; Francini, Franco; Quansah, Gabriel W.; Sansoni, Paola (University of Cape Coast, 1998)

A photosedimentation technique is used to analyze the size composition of soil samples. The number and size of the particles are determined, respectively, by the Stokes formula and the Beer–Lambert law, measuring time-of-flight ...
Nonlinear acoustoelectric effect in a semiconductor superlattice

Mensah, S Y; Ahllotey, F.K.A; Mensah, N.G. (University of Cape Coast, 1999)

The acoustoelectric effect in a semiconductor superlattice (SL) has been studied for a hypersound in the region ql 1 (where q is the acoustic wave number and l is the electron mean free path). A nonlinear dependence of ...
Interaction of kink-lattice solitons with small-amplitude waves in finite-size superlattices

Mensah, S.Y.; Dikande, A.M.; Allotey, F.K.A.; Mensah, N.G. (University of Cape Coast, 1999-09)

Propagation of large-amplitude electromagnetic fields and their interactions with small-amplitude waves in finite superlattices are considered in the framework of the sine-Gordon theory. Finite-size effects result in ...
Laser-induced fluorescence spectroscopy (lifs) - a non-destructive method to detect tissue browning

Wulf, Janina S.; Herppich, Werner B.; Geyer, Martin; Zude, Manuela (University of Cape Coast, 2000)

Laser-induced fluorescence spectroscopy (LIFS) was non-destructively applied on sound and bruised apples. Furthermore, the technique was tested to measure surface browning of freshly cut banana slices, which were treated ...
Temperature dependence of the thermal conductivity of single-wall carbon nanotubes

Osman, Mohamed A; Srivastava, Deepak (University of Cape Coast, 2000)

The thermal conductivity of several single-wall carbon nanotubes has been calculated over a temperature range of 100–500 K using molecular dynamics simulations with the Tersoff–Brenner potential for C–C interactions. In ...

Now showing items 1-20 of 205

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