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Lutetium oxide nanopowders codoped with Tm 3+ and Yb 3+ were synthesized by the reverse-strike co-precipitation method. Effects of precipitant solution pH on the structural, morphological and upconversion luminescent properties of Lu 2 O 3 :2%Yb, 0.2%Tm nanopowders had been investigated. The results show that pH value of the precipitant (NH 4 HCO 3 )...
With the continuous improvement of the functions of mobile phones, the human voice as the most natural way of communication has been drawn wide attention because of its convenience and accessibility. However, there exist some problems in the application of voice interactions. This paper analyses the current voice interaction, and induces three kinds of problems: accurate quantification, multiple choices,...
In digital geometry, triangular mesh models have been widely used recently to represent an object. To process triangular mesh models orthogonal function systems over triangular domain have become more and more important. The W-system of degree k is a new hybrid orthogonal function system consisting of piecewise polynomials of degree k. Univariate W-system has been constructed in direct way, whereas...
Objective to develop a signal processing system based on FPGA used in digital ophthalmology ultrasongraphy to process echo signals. Methods main signal processing technique used in the system includes interpolation, dynamic filter, TGC, envelop demodulation and logarithmic amplifier. In FPGA, a schematic file acts as the top module, and hardware describe language VHDL act as bottom modules. Results...
The density, degree of crystallinity, melting temperature, thickness, frequency and type of unsaturated groups accessible and inaccessible to bromine in chloroform, and the frequency of methyl groups have been determined for five polyethylene (PE) films. Attempts to correlate the diffusion coefficients in the PE or the PE/methanol partition constants for N,N-dimethylaniline (DMA) and one of the microscopic...
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