排序方式: 共有52条查询结果,搜索用时 0 毫秒
1.
The molecular weight distribution of copolymers of p-benzoquinone and styrene was studied by g.p.c.. It was shown that the products synthesized have low molecular weights and narrow MWD. p-Benzoquinone was found to be a copolymer macromolecule regulator. 相似文献
2.
3.
Three-dimensional face recognition in the presence of facial expressions: an annotated deformable model approach 总被引:1,自引:0,他引:1
Kakadiaris IA Passalis G Toderici G Murtuza MN Lu Y Karampatziakis N Theoharis T 《IEEE transactions on pattern analysis and machine intelligence》2007,29(4):640-649
In this paper, we present the computational tools and a hardware prototype for 3D face recognition. Full automation is provided through the use of advanced multistage alignment algorithms, resilience to facial expressions by employing a deformable model framework, and invariance to 3D capture devices through suitable preprocessing steps. In addition, scalability in both time and space is achieved by converting 3D facial scans into compact metadata. We present our results on the largest known, and now publicly available, face recognition grand challenge 3D facial database consisting of several thousand scans. To the best of our knowledge, this is the highest performance reported on the FRGC v2 database for the 3D modality 相似文献
4.
Approximate calculation of the characteristics of multirate systems with inelastic and elastic calls
Models of multirate systems in which inelastic and elastic calls (ie-calls and e-calls, respectively) are jointly serviced are investigated. It is assumed that through the entire service period the iecalls simultaneously occupy b ≥ 1 channels of the system, moreover, all the channels begin and complete servicing of the same ie-call simultaneously. The elastic calls simultaneously occupy m channels, m ≤ m ≤ \(\bar m\), where m and \(\bar m\) are specified quantities, with the service rate being proportional to the number of channels busy servicing e-calls. Models with continuous and discrete band for servicing e-calls are investigated in detail. Effective numerical algorithms for calculating the characteristics of the models are developed and results of computational experiments are presented. 相似文献
5.
6.
Allakhverdiev K Ismailov N Salaeva Z Mikailov F Gulubayov A Mamedov T Babaev S 《Applied optics》2002,41(1):148-153
We report the results of investigating a low-voltage, polarization-insensitive, reflective-type modulator based on an epsilon-GaSe crystal and operated at the 1.960-eV line of a He-Ne laser. We demonstrate that the modulation in an Al-epsilon-GaSe-Cu device results mainly from the Franz-Keldysh effect. Relatively high speed and low operating voltage could make these modulators with Schottky-barrier contacts attractive devices in the red range of the spectrum. 相似文献
7.
Effect of tube size on performance of a fixed-film tubular bioreactor for conversion of hydrogen sulfide to elemental sulfur 总被引:8,自引:0,他引:8
A fixed-film continuous-flow photobioreactor was used for the removal of hydrogen sulfide from synthetic industrial wastewater and conversion of it to elemental sulfur using sixteen 150 mm length Tygon tubes as the active part of the reactor. Three different tube sizes (internal diameters (ID) 6.4, 3.2, and 1.6mm) were used to investigate the effect of tube size on reactor performance. The reactor with 1.6mm tube attained a higher sulfide loading (1451 mg/Lh) than previously reported in the literature. High bacterial concentration, light to volume ratio and intimate contact between attached bacteria and influent sulfide resulted in excellent performance of the 1.6mm tube reactor. 相似文献
8.
Using a statistical concept, a mathematical model is developed to describe the coke concentration in a fine-particle catalyst in a reactor–regenerator circulation system in terms of the coke concentration distribution of particles. The efficiencies of the proposed model and a perfect-mixing quasi-homogeneous model are compared. 相似文献
9.
Kejun Zeng Roger Stierman Don Abbott Masood Murtuza 《JOM Journal of the Minerals, Metals and Materials Society》2006,58(6):75-79
This paper reports on a study of the reaction of solder with the electrolessnickel with immersion gold (ENIG) plating system,
and the resulting interfacial structures. Aforcused-ion beam (FIB) was used to polish the cross sections to reveal details
of the microstructure of the ENIG-plated pad with and without soldering. High-speed pull testing of solder joints was performed
to expose the pad surface. Results of scanning-electron microscopy/energy-dispersive x-ray analysis of the cross sections
and fractured pad surfaces support the suggestion that black pad is the result of galvanic hyper-corosion of the plated electroless
nickel by the gold plating bath. Criteria are proposed for diagnosing black pad of ENIG plating. 相似文献
10.
Pyridoxal enzymes of transamination (aspartate aminotransferase, KF 2.6.1.1. and alanine aminotransferase, KF 2.6.1.2) have been studied for their activity in different departments of the rabbit brain under the effect of ionizing radiation and introduction of pyridoxal phosphate. It has been established that the effect of ionizing radiations does not evoke the change in aspartate aminotransferase and alanine aminotransferase activity in different structure-functional departments of the rabbit brain, the decrease of aminotransferases activity in the acute period of the radiation sickness being natural. Introduction of pyridoxal phosphate irradiated animals promotes relative normalization of activity of the enzymes under study. 相似文献