摘要:

AbstractThe concept of high‐speed control of a mechanical process via electrical modulation of the flow of some kind of hydraulic cum semiconductor liquid is introduced. This is done in order to stimulate activity towards the provision of improved power transmission media for use in the formulation of intelligent tools and systems. A quantum leap in machine performance is the aim; flexibility of operation and motion‐switching speeds 10 times higher than presently available are in demand. Some information is given on the background and application aims of the concept. Brief state‐of‐the‐art information is presented on the front‐runner of enabling solutions to this industrial equivalent of recent innovations in information technology—the electrorheo

ISSN:1057-9257    

DOI:10.1002/amo.860010402

出版商:John Wiley&Sons Ltd.    

年代:1992

数据来源: WILEY

摘要:

AbstractWe have shown that poly(para‐phenylene) (PPP) can be obtained either n‐type or p‐type by ion implantation at low energy (E≦ 50 keV); PPP is primarily an insulator pellet obtained from compacted powder synthetised by the Kovacic method. To compare with the chemical doping effect, we have studied the conductivity and thermopower of PPP samples after two successive ion implantations with Cs+and I+.The experimental results show that we clearly obtain reversible doping only in the case of an initially I+‐doped sample: the thermopower sign is changed after a Cs+implantation with a fluence equal to 3 × 1014ions cm−2. In the other case (Cs+initial implantation) we observe the change in thermopower sign at higher fluence (2 × 1016I+ions cm−2). This last effect can be attributed to a metal transition induced by the accumulation of defects in the material because of too high implantation parameters (

ISSN:1057-9257    

DOI:10.1002/amo.860010403

出版商:John Wiley&Sons Ltd.    

年代:1992

数据来源: WILEY

摘要:

AbstractDecay of the delayed luminescence of 1,1‐bis(di‐4‐tolylaminophenyl)cyclohexane, both doped into a polycarbonate binder and matrix‐isolated in an MTHF glass, has been studied upon excitation with the 308 nm line of an excimer laser. Time‐resolved emission spectra have also been recorded. In the early time regime, 30 ns

ISSN:1057-9257    

DOI:10.1002/amo.860010404

出版商:John Wiley&Sons Ltd.    

年代:1992

数据来源: WILEY

摘要:

AbstractMBE‐grown gallium arsenide epitaxial layers on silicon, with thicknesses between 0.1 and 8.1 μm, have been studied using a simple rotating polariser multiple‐angle‐of‐incidence ellipsometer. From these data, information on the roughness of the surfaces of the layers and the anisotropy of the refractive index of the layers has been obtained. The results are compared with data obtained on the same samples using scanning electron microscopy and conventional spectroscopic elli

ISSN:1057-9257    

DOI:10.1002/amo.860010405

出版商:John Wiley&Sons Ltd.    

年代:1992

数据来源: WILEY

摘要:

AbstractA wide range of applications which involve organic crystalline materials require the metallisation of low‐molecular‐weight compounds. Conventional lithographic techniques used in silicon fabrication technology use high‐temperature processing methods which are unsuitable for organic materials. Gold/titanium bilayer and shadow‐masking techniques were found to provide suitable solutions to the problem of metallisation of these materials and allowed fabrication of a surface acoustic wave (SAW) device with (–)‐2‐α‐methylbenzylamino‐5‐nitropyridine

ISSN:1057-9257    

DOI:10.1002/amo.860010406

出版商:John Wiley&Sons Ltd.    

年代:1992

数据来源: WILEY

摘要:

AbstractIn the present work the gas dynamics in the growth zone of SiC crystals is investigated. It is shown that the propagation of SiC vapour from the growth cavity walls towards the lids is effected by diffusion. On this basis the calculation of the concentration distribution of SiC vapour (n), the equilibrium vapour concentration (ns) and the supersaturation (α = [(n – ns)/ns] × 100%) in the crystal growth zone at different radial and axial gradients is carried out by solving the Laplace equation in cylindrical co‐ordinates for a stationary case corresponding to the conditions of crystal growth. The results obtained are compared with the available experimental data, which gives the possibility of explaining some of the observed peculiarities during SiC crystal growth from the vapour phase by the sublimation m

ISSN:1057-9257    

DOI:10.1002/amo.860010407

出版商:John Wiley&Sons Ltd.    

年代:1992

数据来源: WILEY

ISSN:1057-9257    

DOI:10.1002/amo.860010408

出版商:John Wiley&Sons Ltd.    

年代:1992

数据来源: WILEY

ISSN:1057-9257    

DOI:10.1002/amo.860010401

出版商:John Wiley&Sons Ltd.    

年代:1992

数据来源: WILEY