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排序方式: 共有526条查询结果,搜索用时 15 毫秒
41.
Clive Maier 《Materials & Design》1985,6(5):239-243
The problems associated with injection moulding are listed. The uses of the Moldflow program to assist in the practical solution of these are described. 相似文献
42.
43.
Clive W. Ford 《Journal of the science of food and agriculture》1984,35(8):881-886
A method is described for the simultaneous determination by reversed-phase h.p.l.c. of proline, glycinebetaine, trigonelline and stachydrine. The mobile phase was water containing 0.02M dibutylamine phosphate at pH 3.0. The compounds were separated in a Dextropak Radial-PAK Cartridge and were detected by a differential refractometer. Total time of elution was 8 min. The method was applied to the analysis of leaves of two tropical grasses and a tropical legume which had been subjected to water stress. 相似文献
44.
Cheng Liu Peng Liu Keisuke Kobayashi Clive A. Randall 《Journal of Electroceramics》2014,32(4):301-306
A NaF-Nb2O5 flux doped (Na,K)NbO3 (NKN) based lead-free ceramic was successfully co-fired with nickel inner electrodes in reduced atmospheres. No chemical reactions and/or inter-diffusion were detected at the interface between the nickel (Ni) electrodes and the NKN-based piezoelectrics. Dielectric, resistivity, and electromechanical performance were measured with processing under different firing conditions and flux additions to obtain high densities. Ceramics are obtained with submicron grain structures with the NaF-Nb2O5 sintering aids (2 and 4 wt%) fluxes, and high densities when firing at low pO2 (10?10 atms) atmospheres at sintering temperatures ~1150 °C for 2 hours. High resistivities and low losses can be obtained through a second annealing condition at 850 °C and 10?7 atms at 8 hours. High d 33 values (over 350 pm/V) determined under unipolar converse electromechanical measurements were obtained in the simple prototyped co-fired structures to show feasibility towards base metal electrodes in multilayer actuators. 相似文献
45.
ABSTRACT Drying studies were carried out on single droplets suspended from a rotating nozzle in a horizontal wind tunnel. Droplets were of solution of a third type of skin-forming material, namely the natural products skim milk or fructose. Droplet weight and temperature were measured during the drying process. Dried crusts were recovered and examined by Scanning Electron Microscopy. With this type of material a skin first forms at any drying condition on the surface of the droplet at a cerlain stage of drying. A crust subsequently forms beneath the skin. The final dried panicle retains the structure and properties of the original powder, unless the material is dried at very high temperatures. e.g. >300 °C. which result in burning. An increase in air temperature resulted in the formation of a smoother skin offering a higher resistance to vapour diffusion. At temperatures over 100 °C droplets exhibited puffing or ballooning phenomena; i.e. they inflated and deflated many times before forming the final dried particles. 相似文献
46.
Clive J. Oliphant Christopher J. Arendse Sara N. Prins Gerald F. Malgas Dirk Knoesen 《Journal of Materials Science》2012,47(5):2405-2410
We report on the application of electron backscatter diffraction to investigate the structural changes of a tantalum filament
operated at typical hot-wire chemical vapour deposition conditions for the synthesis of hydrogenated nanocrystalline silicon.
Various tantalum-silicides, identified by electron backscatter diffraction, form preferentially along the length of the filament.
The filament has a recrystallized Ta inner core and a TaSi2 layer encapsulated with a Si layer at the cooler ends. The αTa5Si3, metastable Ta5Si3 and Ta2Si phases formed in addition to recrystallized Ta and TaSi2 at the centre regions. Cracks and porosity were prevalent throughout the length of the filament. The microstructural evolution
of the aged tantalum filament can be ascribed to the thermal gradient along the filament length, recrystallization of Ta and
the variation of silicon content within the filament. 相似文献
47.
Clive R. Cartlidge Leisl Dukhedin-Lalla Parviz Rahimi John M. Shaw 《Petroleum Science and Technology》2013,31(1-2):163-178
ABSTRACT The phase behaviour of heavy oil mixtures was studied using an X-ray imaging system. Batch phase experiments were performed at temperatures and pressures up to 725 K and 7 MPa. Complex phase behaviour such as liquid-liquid-vapour and solid-liquid-liquid-vapour were observed and preliminary experimental phase diagrams were constructed. This observed complex phase behaviour is consistent with thermodynamic theory and such phase behaviour can be modelled using the Peng-Robinson equation of state and the tangent plane criterion. These latter points are illustrated through the phase diagram for a model reservoir fluid (ethane + propane + n-butane + phenanthrene) which exhibits solid-liquid-liquid-vapour phase behaviour. Example predicted and experimental phase diagrams are presented for this model system. 相似文献
48.
49.
Anton V. Polotai Tae-Hee Jeong Gai-Ying Yang Elizabeth C. Dickey Clive A. Randall Pascal Pinceloup Abhijit S. Gurav 《Journal of Electroceramics》2009,23(1):6-12
Multilayer ceramic capacitors based on BaTiO3 dielectric compositions and Ni inner electrodes have complex interfacial reactions that impact the continuity of the inner
electrode microstructure. Previously we demonstrated that through the addition of Cr to Ni, a significant improvement in the
continuity of ultra-thin Ni electrodes in Ni–BaTiO3 multilayer capacitors could be achieved. Here, the effect of the Cr addition to the nickel electrode pastes is studied with
regard to the electrical properties. Low-field electrical measurements demonstrate no major differences between Cr doped Ni
and undoped Ni. However, high-field measurements show a significant decrease to the total capacitor resistance. Under a critical
electrical bias the conductivity significantly increases due to a Fowler–Nordheim tunneling conduction though the interfacial
Schottky barrier at the dielectric–electrode interface; the onset voltage of this conduction is much lower than with the undoped
nickel. Based on these results, we evaluate criteria for the selection of an appropriate refractory metal in order to improve
the Ni electrode continuity. 相似文献
50.
Dylan M. Jones Clive R. Frankish Kevin Hapeshi 《Behaviour & Information Technology》1992,11(2):109-122
There is a growing interest in the commercial possibilities offered by automatic speech recognition (ASR) technology. Unfortunately the prospective user has little independent guidance with respect to the potential success of any proposed implementation. There do exist a few general human factors guidelines on the use of ASR, but most of the corpus of knowledge that forms part of the lore within the ASR community is based on the unpublished experiences of system.developers and users themselves. The present paper attempts to redress this balance; it is a summary of the experiences of users and system designers at 30 research and commercial sites in the UK and USA where ASR has been extensively used or tested. The application represented were classified as vehicle, office, industrial, and aids for disabled people. A number of important human factors issues were identified, and the relative success of the various applications are discussed. 相似文献