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41.
P Bourges MH Lemée-Cailleau P Launois C Ecolivet H Cailleau F Moussa A Mierzejewski 《Canadian Metallurgical Quarterly》1996,54(21):15002-15015
42.
New numerical quasi-static model for the computer aided design (CAD) and analysis of suspended microstrip lines is reported. This model is applicable up to εr = 20 and over the range 0.001 ≤ u ≤ 1000, where u = w/h 1 is the structure’s variable (w is the width of the strip and h 1 is the air gap’s thickness). The practical cases are limited to a thickness h 1 of the same order of h 2 which is the dielectric’s thickness. This yields to choose 0.5 ≤ m ≤ 1.5. The parameter m is dependent on the structure’s variable u. This model is conceived to corroborate the results of the variational approach in any point of its ranges of validity, with a raised error with 1.2%. Although the variational approach allows accurate values of the effective permittivity, but the computing time is relatively high which quickly becomes prohibitory if the Finished Coupled Elementary Lines method is used. The present model is an improvement over the previous variational method as it not only takes lower computing time but it also valid up to high values of εr and over the range 0.001 ≤ u ≤ 1000. This work is important by the fact that it seeks to visualise the formal model of the effective permittivity, generally masked in a direct variational treatment. 相似文献
43.
MIDI has intrinsic limitations that have held back the development of flexible microtunable systems. The author evaluates previous solutions and address the problem of pervasive microtuning in MIDI networks within the context of the general weaknesses and underusage of MIDI technology. Then the author describes the prototyped and patent-pending solution called U-Tune, which involves implementing pervasive microtuning over a MIDI network. 相似文献
44.
S.O. Moussa M.A.M. Ibrahim S.S. Abd El Rehim 《Journal of Applied Electrochemistry》2006,36(3):333-338
Induced electrodeposition of Ni–W alloys was carried out onto steel substrates from acidic citrate baths (pH 4.5) under different
conditions of concentration of electrolyte, current density and temperature. Bright and highly adherent Ni–W deposits were
successfully obtained with a relatively high cathodic current efficiency CCE (80–85%). The CCE increases greatly with increasing
pH and Ni2+ ion content in the bath. The W% in the alloy deposits is in the range of 4–20 wt% depending on the operating condition. The
W content in the deposit was found to increase with an increase in Ni2+ ion content, pH and temperature. The surface morphology was examined by scanning electron microscopy while the structure
of the alloy was examined by X-ray diffraction analysis. 相似文献
45.
Damage evolution and infrared thermography in woven composite laminates under fatigue loading 总被引:2,自引:0,他引:2
An analytical model based on cumulative damage has been used for predicting the damage evolution in composite materials. The model is verified with experimental data from a carbon/epoxy composite fatigued under tension–tension load. Fatigue tests of specimens have been monitored with an infra-red thermography system. By analysing the temperature of the external surface during the application of cyclic loading, it is possible to evaluate the damage evolution. The model agrees well with the experimental data, and it can be used to predict the evolution of damage in composites. 相似文献
46.
R. M. Ibberson S. M. Moussa M. J. Rosseinsky A. N. Fitch D. Iddles T. Price 《Journal of the American Ceramic Society》2006,89(6):1827-1833
In situ methods are ideally suited to study the development of property-critical structural features during material processing. As an example of their potential in the area of complex oxide electroceramics, here, we apply X-ray synchrotron and neutron powder diffraction to investigate the ordering processes responsible for optimizing the microwave dielectric properties of the commercial electroceramic barium zinc tantalate (BZT) doped with strontium gallate. The collection of synchrotron diffraction data with high resolution and high intensity during processing has allowed the development of cation site order and growth of ordered domains to be followed during the multi-stage thermal treatment processing used by industry. Complementary neutron diffraction data reveal changes in the cation–oxygen bonding associated with development of the cation-ordered trigonal perovskite structure. The effects of material loss with processing at temperatures of up to 1525°C are discussed following experiments using open and closed systems. The complex nature of the ordering is confirmed by the coexistence of two BZT phases and the formation of a further zinc-deficient phase. The implications of these observations and relation to the industrial processing procedures are discussed. 相似文献
47.
Fathi Moussa Pascale Chretie Pierre Dubois Laurence Chuniaud Michelle Dessante Fran ois Trivin Pierre-Yves Sizaret Viatcheslav Agafonov Ren C olin Henri Szwarc Virginie Greugny Claude Fabre Andr Rassat 《Fullerenes, Nanotubes and Carbon Nanostructures》1995,3(3):333-342
In order to check its possible acute toxicity, C60 was incorporated into living human phagocytes. It was observed that C60 has no influence on the survival of human leukocytes. 相似文献
48.
G. E. M. Moussa N. F. Eweiss 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1969,19(11):313-317
The results of oxidation of some mono-aryl aliphatic olefins by chromic acid in aqueous sulphuric acid and by chromic oxide in acetic anhydride are compared and discussed. 相似文献
49.
50.
The pedagogical product presented below is a practical work intended to the electrical engineering students, fourth year, of the National Institut of Applied Sciences of Rennes. This work is a part of filter realisation programme either in microstrip technology or lumped element. The aim of this practical work is restricted to calculate by optimizing all the basic parameters of the filter realization. Thus, an optimization and simulation work is performed on computer, by using a Touchstone software product of the Electronic Engineering Software society, to obtain parameter values close to the wished ones. This practical work is performed by groups of two students during three hours. 相似文献