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排序方式: 共有53条查询结果,搜索用时 15 毫秒
1.
Vjacheslav V. Zuev 《Journal of Polymer Research》2008,15(5):351-356
Functionalized polyanilines containing biphenyl, terphenyl, carbazole, anthracene, and 4-n-hexylphenyl moieties were synthesized though the reaction of polyaniline in emeraldine base form with sodium salt of corresponding
vinylketoaromatics with quantitative yields. Polymers were characterized with Fourier transform infrared spectroscopy, proton
nuclear magnetic resonance spectroscopy, and thermogravimetry. The emission characteristics of these polymers in N-methyl-2-pyrrolidone solution were examined. The functionalized polyanilines exhibited an intense green emission. 相似文献
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3.
User-perceived quality of service in wireless data networks 总被引:1,自引:0,他引:1
Anthony J. Saliba Michael A. Beresford Milosh Ivanovich Paul Fitzpatrick 《Personal and Ubiquitous Computing》2005,9(6):413-422
For so long, the term quality of service (QoS) has been a pursuit area for network engineers trying to dimension wireless
networks to run in the most efficient way possible. Of late, there has been a trend reversal, looking at the user perceptions
of the network performance to decide where dimensioning can have the greatest impact. This paper demonstrates the importance
of defining the concept of user-perceived QoS and linking this to specific wireless data network parameters for some anticipated
valuable applications. It has been shown that a quantitative rating can be obtained for a variety of important factors in
the assessment of service quality, and mapped to specific values of multiple network parameters. We found QoS to be application-specific,
where various applications require different levels of network performance to satisfy users. The role of physical location
was also examined, investigating the influence of being indoors versus outdoors on the user perception of QoS. 相似文献
4.
Rationally based model for evaluating the optimal refrigerant mass charge in refrigerating machines 总被引:6,自引:0,他引:6
Naer Vjacheslav Andrey Rozhentsev Chi-Chuan Wang 《Energy Conversion and Management》2001,42(18):2083-2095
A rationally based algorithm was proposed to evaluate the optimal mass charge into refrigerating machines. The calculated results indicate that the system performance is strongly related to the refrigerant mass charge. In the early stage of the refrigerant charge process, a sharp rise of COP is observed. The COP reaches an optimal value for a specified refrigerant charge and shows a slight drop for a further increase of refrigerant charge. Calculated results reveal similar trends to those of experimental data. The analysis of the study can well interpret the cycle transformation subject to refrigerant mass charge. 相似文献
5.
Vladimir Ivanovich Lysenko Sergey Bardakhanov Alexey Korchagin Nikolay Kuksanov Alexander Lavrukhin Rustam Salimov Sergey Fadeev Vladislav Cherepkov Mikhail Veis Andrey Nomoev 《Bulletin of Materials Science》2011,34(4):677-681
Electron-beam evaporation of various natural and industrial materials in the atmosphere of different gases at atmospheric
pressure can be used for the synthesis of nanosize powders. These powders are characterized by high purity and may exhibit
unusual properties. In particular, nanopowders of silicon dioxide and oxide (SiO2, SiO), magnesia (MgO), alumina (Al2O3), titania (TiO2), gadolinium oxide (Gd2O3), various metals (tantalum, molybdenum, nickel, aluminium, copper, silver), semiconductor (Si), nitrides (AlN, TiN), and
some other substances had been produced. The process of nanopowder synthesis is highly effective; in particular, the yield
of oxides can exceed ten kilograms per hour. 相似文献
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8.
M Bonomini S Forster V Manfrini F De Risio M Steiner MI Vidovich H Klinkmann P Ivanovich A Albertazzi 《Canadian Metallurgical Quarterly》1996,72(2):197-204
The effects of the adsorption of the fluorescent potential-sensitive dyes RH-421, RH-237 and RH-160 on the bilayer lipid membrane were studied. It was shown that a dipole potential drop, positive in the hydrophobic part of the membrane, arose due to the dye adsorption. The dye adsorption led to a considerable increase of the rate constant of hydrophobic anion translocation through the membrane, but did not affect their partition coefficient between membrane and water. It implies that the region of the membrane where the potential drops is located deeper than the adsorption plane of hydrophobic ions. The values of boundary potential differences were estimated by two independent methods with unilateral and bilateral application of the dyes to lipid bilayer membranes. The results suggest that RH dye molecules penetrate through the lipid bilayers. The values of zeta-potential in liposomes did not change on dye adsorption. Hence, dye molecules are adsorbed in a form that does not change the surface charge. We estimated the effects of electric field of dye dipole layer on an individual dipole located in the same layer and on ion transport through a membrane protein Na+/K+-ATPase. It turned out that the local electric field of each dye dipole decayed so rapidly that a neighbouring dye molecule did not feel it. It also appeared that RH dyes could have but a minor effect on the electrogenic transport performed by the sodium pump in the examined range of dye concentrations. 相似文献
9.
Son JY Bobrinev VI Kim KT 《Journal of the Optical Society of America. A, Optics, image science, and vision》2005,22(9):1739-1745
The depth resolution and the recordable object depth range, obtainable with parallel, toed-in and sliding aperture camera configurations for multiview image acquisition in the three-dimensional imaging systems, are found by assuming that the camera lens resolution is diffraction limited and the resolution of the recorded image is limited by a pixel pitch of the imaging sensor. The depth resolution for the holographic image is calculated and compared with that of the multiview images for the same parameter values. The influence of the viewer's eye resolution limit on the depth resolution of the multiview images and hologram is also found. 相似文献
10.
Vladimir I. Shashkin Yuri A. Drjagin Vjacheslav R. Zakamov Sergei V. Krivov Lev M. Kukin Arcady V. Murel Yuri I. Chechenin 《Journal of Infrared, Millimeter and Terahertz Waves》2007,28(11):945-952
The principles of construction of millimeter wave detectors based on low-barrier Schottky diodes and planar antennas are discussed. The modified planar slot antenna with low beam spillover at the resonant frequency of 94 GHz has been developed. Experiments have been carried out to investigate detecting characteristics of the diodes with differential contact resistances \( R_{j} = 1 \div 1000\;{\text{k}}\Omega \) at zero bias. Experimental data are well correspond to calculations in a simple model of detector. At \( R_{j} = 20 \div 100\;{\text{k}}\,\OmegaΩ \) the maximum of rf-to-dc voltage sensitivity - more than 10000 V/W - is obtained. At lower values of \( R_{j} = 2 \div 6\;{\text{k}}\,\Omega Ω \) a better noise equivalent power (NEP), around 10?12 W Hz?1/2, is predicted. 相似文献