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1.
M. P. THOMAS N. L. PETERSON E. HUTCHINSON 《Journal of the American Ceramic Society》1985,68(2):99-104
The tracer diffusion coefficients of 22 Na and 86 Rb and electrical conductivity were measured in a series of 0.56(Na, Rb)2 S.0.44SiS2 glasses as a function of the Rb/Na ratio and temperature. The data were used to calculate the Haven ratio as a function of the Rb/Na ratio. The Haven ratio at 149.6°C increases from ∼0.3 in single-alkali glasses to ∼0.80 for intermediate compositions. The results are consistent with a single jump mechanism involving jumps of alkali ions between unoccupied sites. The observed correlation effects arise through interactions between alkali ions and charge-compensating centers in the glass network. The charge-compensating centers are thought to correspond to non-bridging oxygen ions in some oxide glasses and to nonbridging sulfur ions in sodium-rubidium silicon sulfide glasses. 相似文献
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ABSTRACT This work presents a rotor resistance estimation algorithm. The estimation process is based on a recursive least squares method. It is applied to a speed sensorless induction motor drive scheme in order to implement slip adaptation. A discrete approach is considered in which an induction motor model written in form of difference equations is used by the estimation algorithm. All the associated mathematical developments are shown. Simulation results are used to verify the performance of the proposed rotor resistance estimator. 相似文献
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From the results of monitoring commercial test packs, synthetic test packs, and related laboratory experiments, the effects of dithiocarbamate fungicide residues on the shelf-life of canned acid fruits in plain tin containers have been clearly demonstrated. It has been shown that the sulfur compounds resulting from the decomposition of the fungicides are the “active” species and, depending on the quantity of fungicide initially present, can control corrosive failure through pitting corrosion mechanisms. Steel chemistry has also been shown to be an important factor in these interactions as evidenced by the superior performance of aluminum deoxidized continuous cast containers when compared to containers produced from type L ingot steel. 相似文献
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CAROL A. WESSMAN JOHN D. ABER DAVID L. PETERSON 《International journal of remote sensing》2013,34(8):1293-1316
Abstract High spectral resolution Airborne Imaging Spectrometer (AIS) data were acquired over 20 well-studied Wisconsin forest sites to evaluate the potential of remote sensing for estimating forest canopy chemistry. Intensive nutrient cycling research in these forests demonstrates that canopy lignin content is strongly related to measured annual nitrogen mineralization at the undisturbed sites and may serve as an accurate index for nitrogen cycling rates. Ground measurements were made of foliar biomass and canopy nitrogen and lignin content, the latter within two weeks of the AIS overflight. The spectral data were transformed using derivative techniques modified from laboratory spectroscopy. Stepwise regression assisted in determining combinations of wavelengths most highly correlated with canopy chemistry and biomass. Strong correlations between AIS data and total canopy lignin content in deciduous forests and canopy lignin concentration (total lignin/biomass) in both deciduous and coniferous stands indicate that imaging spectrometry can be used to estimate canopy lignin content and, from that, the spatial distribution of annual nitrogen mineralization rates. 相似文献
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Lithium niobate is a very important material for integrated optical devices. The results of a Fourier transform NMR study of nonstoichiometric ceramic samples of this material are reported here. A random distribution in nuclear quadrupole coupling constant, with an approximately Lorentzian probability density function, accounts for changes observed in the NMR spectra. 相似文献
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THE ALKYLBENZENES IN ROAST BEEF 总被引:1,自引:0,他引:1
10.
CARSTEN PETERSON 《连接科学》1991,3(1):3-33
Various applications of the mean field theory (MFT) technique for obtaining solutions close to optimal minima in feedback networks are reviewed. Using this method in the context of the Boltzmann machine gives rise to a fast deterministic learning algorithm with a performance comparable with that of the backpropagation algorithm (BP) in feature recognition applications. Since MFT learning is bidirectional its use can be extended from purely functional mappings to a content addressable memory. The storage capacity of such a network grows like O (10–20)nH with the number of hidden units. The MFT learning algorithm is local and thus it has an advantage over BP with respect to VLSI implementations. It is also demonstrated how MFT and BP are related in situations where the number of input units is much larger than the number of output units. In the context of-finding good solutions to difficult optimization problems the MFT technique again turns out to be extremely powerful. The quality of the solutions for large travelling salesman and graph partition problems are in parity with those obtained by optimally tuned simulated annealing methods. The algorithm employed here is based on multistate K-valued (K > 2) neurons rather than binary (K = 2) neurons. This method is also advantageous for more nested decision problems like scheduling. The MFT equations are isomorfic to resistance-capacitance equations and hence naturally map onto custom-made hardware. With the diversity of successful application areas the MFT approach thus constitutes a convenient platform for hardware development. 相似文献