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91.
Aligned eutectic composites of unstabilized ZrO2-Ta and Y2O3-stabilized ZrO2-Ta were grown by direct internal zone melting. Samples with unstabilized ZrO2 were almost completely crack-free even though the matrix had transformed from the tetragonal to the monoclinic lattice. Stabilized ZrO2-Ta composites were heavily cracked and exhibited less homogeneous fiber growth. The Ta fiber diameter in unstabilized eutectics decreased from 0.45 to 0.20 μm, as growth rates increased from 4.4 to 27 cm/h. The fracture of the composites always took place in a controlled manner. The reason is plastic deformation of the fibers and subsidiary crack formation within the twinned ZrO2 matrix. The Ta fiber ductility is caused by solute Zr which reduces the oxygen solubility of Ta considerably. 相似文献
92.
The effects of produced ethanol and specific growth rate on the lipid content and composition of Saccharomyces cerevisiae CBS 2806 were studied using anaerobic chemostat cultures. The cells adapted to increased concentrations of produced ethanol by increasing the proportion of ergosterol at the expense of lanosterol, by increasing the proportion of phosphatidylinositol at the expense of phosphatidylcholine, and by increasing the amount of C18:0 fatty acids in total phospholipids at the expense of C16:0 fatty acids. The produced ethanol had no effect on the phospholipid content nor on the proportion of unsaturated fatty acids in the phospholipids. The specific growth rate had no effect on the phospholipid content, the sterol composition, the phospholipid composition, the fatty acid composition of total phospholipids, or on the proportion of unsaturated fatty acids in the phospholipids of S. cerevisiae. It was not possible to separate the effects of produced ethanol and growth rate on the ergosterol content of the chemostat-grown S. cerevisiae cells. 相似文献
93.
Nils Claussen 《Materialwissenschaft und Werkstofftechnik》1982,13(4):138-147
Transformation-Toughened Ceramics A summary is given on the toughening of ceramics by utilizing the tetragonal-to-monoclinic phase transformation of ZrO2 particles dispersed in the ceramic matrix. Various parameters controlling this martensitic transformation (especially Ms) are discussed together with in situ-TEM observations. The possible toughening mechanisms that allow for additional energy dissipation at crack tips are stress-induced transformation and nucleation of microcracks. Further strengthening is achieved by introducing steady-state surface compressive stresses. The type and magnitude of toughening is controlled by the microstructural design parameters such as volume fraction, chemical composition, size and size distribution of ZrO2 particles which again determine the Ms temperature. The homogeneous dispersion of ZrO2 is the most important step in the technology of transformation-toughened ceramics. Experimental examples for the toughening effect are given for the ceramic matrices Al2O3, ZnO, spinel, mullite and Si3N4. 相似文献
94.
Nils Claussen Bernhard Mussler Michael V. Swain 《Journal of the American Ceramic Society》1982,65(1):14-C-
A simple model incorporating thermal elastic anisotropy stresses is used to calculate the microcrack zone size around cracks in Al2 O3 . It is found that the ratio of microcrack zone size to grain size is almost constant for notched beam tests, but increases with grain size for double cantilever beam data. It is suggested that notched-beam ratios of fracture toughness are related to crack initiation, whereas double cantilever beam values are related to propagation and reflect R-curve behavior of the material. 相似文献
95.
Nils A. Trnqvist 《国际能源研究杂志》1978,2(3):281-294
The problem of how to extract energy from ocean waves is discussed by analysing theoretically the hydrodynamic properties of a few ideal devices, involving vertical energy absorbing plates. the aim is to find a mechanism with high ideal efficiency, but still simple enough, such that its realization in practice can be economically feasible. The most promising device involves one or more vertical elastic plates situated in the water perpendicular to the incoming waves. About a quarter of a wavelength after the (first) plate there is a stiff vertical construction extending sufficiently deep in the water such that it is rather immobile. It serves as a reflector of the waves. the elastic plate is set in oscillation by the wave motion and this motion is used to extract the energy by applying a braking force. the optimal force field is discussed in some detail, and it is shown that not much of the optimal efficiency is lost by letting the force field simply be proportional to the velocity. the device is also shown to be sensitive to a fairly broad spectrum of wavelengths, and this spectrum can be broadened by adding more swinging plates. In this way efficiencies of 80-100 per cent are attained in theory over a wavelength spectrum extending over an order of magnitude. 相似文献
96.
97.
The purpose of this paper is to summarize results for linear multivariable systems that are analogous to those single input single output systems which are “type l”, i.e. that contain l integrators. Both frequency domain and time-domain properties are given. Appropriate conditions that guarantee zero steady state error in tracking vector polynomial inputs are presented. 相似文献
98.
Benter N Bertram RP Soergel E Buse K Apitz D Jacobsen LB Johansen PM 《Applied optics》2005,44(29):6235-6239
We present a large-area electro-optic Fabry-Perot modulator utilizing a photoaddressable bis-azo polymer placed between two dielectric mirrors with an open aperture of 2 cm. A modulation efficiency of 1% at an effective modulation voltage of 20 V for a wavelength of 1.55 microm is demonstrated. By comparing distance tuning of the cavity with wavelength tuning, an effective electro-optic coefficient of -7 pm/V is measured. 相似文献
99.
100.