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991.
Kiang S.-Z. Baker R.L. Sullivan G.J. Chiu C.-Y. 《IEEE transactions on image processing》1992,1(2):162-169
A pruning algorithm of P.A. Chou et al. (1989) for designing optimal tree structures identifies only those codebooks which lie on the convex hull of the original codebook's operational distortion rate function. The authors introduce a modified version of the original algorithm, which identifies a large number of codebooks having minimum average distortion, under the constraint that, in each step, only modes having no descendents are removed from the tree. All codebooks generated by the original algorithm are also generated by this algorithm. The new algorithm generates a much larger number of codebooks in the middle- and low-rate regions. The additional codebooks permit operation near the codebook's operational distortion rate function without time sharing by choosing from the increased number of available bit rates. Despite the statistical mismatch which occurs when coding data outside the training sequence, these pruned codebooks retain their performance advantage over full search vector quantizers (VQs) for a large range of rates. 相似文献
992.
993.
P. G. Vlasenko 《Chemical and Petroleum Engineering》1992,28(10):580-581
Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 10, p. 2, October, 1992. 相似文献
994.
Yu. Medvedevskikh A. Bratus G. Hafiychuk A. Zaichenko A. Kytsya A. Turovski G. Zaikov 《应用聚合物科学杂志》2002,86(14):3556-3569
The kinetics of glycidyl methacrylate block polymerization to high conversion was experimentally investigated with variations of the photoinitiator concentration, temperature, and power of UV illumination. The kinetic curves of this polymerization process contain three characterized sections of coordinates of “conversion–time,” namely: The first one is practically linear to a conversion of ≈0.5, the second represents, by itself, the autoacceleration process, and the third presents the autodecelation process. An additional peculiarity of such a polymerization process is poor reproduction of the kinetic measurements. This reproduction does not correspond to instrumental error. Derivation of a kinetic model for block linear polymerization was done. This model is, quantitatively, in good agreement with all the data of the experimental material. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 3556–3569, 2002 相似文献
995.
Migun N. P. Prokhorenko P. P. Chizh S. G. 《Russian Journal of Nondestructive Testing》2002,38(9):704-708
A new mechanism of aw development has been discovered and experimentally tested. The mechanism is based on the film ow of the penetrant inside the aw channel. 相似文献
996.
Agnesi A. Dell'Acqua S. Piccinini E. Reali G. Piccinno G. 《Quantum Electronics, IEEE Journal of》1998,34(8):1480-1484
Powerful CW diode-pumped Nd:YAG and Nd:YVO4 lasers Q-switched by Cr:YAG saturable absorbers demonstrate efficient (30%-60%) harmonic and parametric conversion, generating hundreds of milliwatts from ultraviolet to mid-infrared 相似文献
997.
V. B. Mikhailov A. N. Chernenko A. G. Kas’yanov A. B. Shutikhin L. I. Bryukhanov 《Metallurgist》1997,41(9-11):314-316
The Zlatoust Metallurgical Plant has developed a technology that employs semi-dry pressing to make two-layer (composite) heat-insulating inserts for ingot-mold hot tops. The working layer is made of a mixture of materials based on quartz sand, while the insulating layer is based on foamed vermiculate. The binders are sodium silicate solution and commercial lignosulfonate with a density of 1.12–1.20 g/cm3. 相似文献
998.
V. I. Timoshenko Yu. V. Knyshenko Yu. G. Lyashenko 《Journal of Engineering Physics and Thermophysics》1997,70(3):394-398
The effect of turbulizing asperities positioned on one of the walls of a plane channel on the intensity of exchange processes
near a smooth wall with injection of different working media is studied experimentally.
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 70, No. 3, pp. 404–408, 1997. 相似文献
999.
LM Mendoza P Paz A Zuberi G Christianson D Roopenian N Shastri 《Canadian Metallurgical Quarterly》1997,7(4):461-472
The products of minor histocompatibility (H) loci are serious barriers to tissue transplantation even among major histocompatibility complex (MHC) identical individuals, frequently causing chronic graft rejection and graft versus host disease. Over 50 minor H loci map to mouse autosomal chromosomes but none are known at the molecular level. By expression cloning, we identified the H13 locus, a classical minor H locus first detected 30 years ago by the trait of graft rejection. The H13a allele is located on chromosome 2 and encodes a novel protein that yields the rare naturally processed nonapeptide SSVVGVWYL (SVL9) for presentation by the Db MHC class I molecule. The SVL9 peptide binds Db MHC despite the absence of the consensus binding motif, and a conservative methyl group substitution (Valine 4 <--> Isoleucine) explains why reciprocal T cell responses are elicited in H13a and H13b congenic strains. 相似文献
1000.
H Riemer R Hainz C Stain G Dekan M Feldner-Busztin P Schenk C Müller K Sertl OC Burghuber 《Canadian Metallurgical Quarterly》1997,52(11):1014-1015
The case is described of a 58 year old man with systemic Whipple's disease with pericardial and pleural effusions and severe pulmonary hypertension. After three months of antibiotic treatment there was a complete resolution, not only of the symptoms known to be associated with Whipple's disease (diarrhoea, arthralgia, pericardial and pleural effusions), but also of pulmonary hypertension. 相似文献