排序方式: 共有38条查询结果,搜索用时 15 毫秒
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In the development process of electrophotography, charged dielectric toner particles move in a micro-gap between the photoreceptor
and the development roller to form images by the action of electrostatic force. To improve image quality, it is important
to clarify the toner particle motion and the effects of the electric field on this motion. In the present study, Particle
Image Velocimetry (PIV) was applied to measure the toner particle motion and the results were compared to calculated results.
It was confirmed that the toner velocity increased with increasing electric field intensity, and that the measurement results
agreed with the calculated results. These results indicated the usefulness of PIV in analyzing toner particle motion in the
development process. 相似文献
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R.J. Buss P. Casavecchia T. Hirooka S.J. Sibener Y.T. Lee 《Chemical physics letters》1981,82(3):386-391
The angular and velocity distribution of OH product frorn the O(1 D) + H2 reaction at 2.7 collision energy has been obtained in a crossed molecular beam study. The product is found to be forward-backward symmetric; most of the reaction occurs through insertion of the oxygen to form ground electronic state H2O. 相似文献
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A non-integrable system has an irregular spectrum for stationary bound energy levels. It is shown that the irregular sequence of level spacings gives an unambiguous representation of chaos in quantum systems. 相似文献
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Leandro Marcondes-Alves Victor Fattori Sergio M. Borghi Yuri Lourenco-Gonzalez Allan J.C. Bussmann Elisa Y. Hirooka 《Natural product research》2019,33(6):921-924
Acetaminophen (paracetamol) is a widely used analgesic and antipyretic drug that is safe at therapeutic doses. However, acetaminophen overdose can be fatal. Currently, the only treatment available is the N-acetyl cysteine. The diterpene kaurenoic acid (ent-kaur-16-en-19-oic acid, KA) is the major constituent of Sphagneticola trilobata (L.) Pruski. KA presents anti-inflammatory, anti-nociceptive and antioxidant properties. In this study, we evaluated the efficacy of KA in a model of acetaminophen-induced hepatotoxicity. KA increased, in a dose-dependent manner, the survival rate after acetaminophen overdose. KA reduced acetaminophen-induced hepatic necrosis and ALT and AST levels. KA decreased acetaminophen-induced neutrophil and macrophage recruitment, oxidative stress and the production of IL-33, TNF-α and IL-1β, alongside with normalisation of IL-10 levels in the liver. Therefore, KA showed preclinical efficacy in acetaminophen-induced hepatotoxicity and lethality. 相似文献
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Doklady Mathematics - 相似文献
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Chirped soliton interaction in strongly dispersion-managed wavelength-division-multiplexing systems 总被引:6,自引:0,他引:6
We theoretically analyze nonlinear interactions between chirped solitons in dispersion-managed wavelength-division-multiplexing (WDM) systems. We employ the perturbation method to evaluate frequency and chirp shifts caused by collisions among different WDM channels. It is shown that a chirped soliton suffers less frequency shift and time displacement than an ideal soliton, indicating its potential applicability for WDM systems. 相似文献
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Masaaki Hirooka Hiroshi Yabuuchi Jiro Iseki Yasuto Nakai 《Journal of polymer science. Part A, Polymer chemistry》1968,6(5):1381-1396
A vinyl monomer that has the nitrile or carbonyl group conjugated to the C?C double bond, such as acrylonitrile, methyl acrylate, and methyl methacrylate, forms a complex with an alkylaluminum halide, and the complex reacts spontaneously with a hydrocarbon monomer such as styrene, propylene, or ethylene, giving a high molecular weight copolymer. The copolymers always contain the two monomer units in 1:1 ratio. Thus styrene, copolymerized with methyl acrylate or methyl methacrylate in the presence of ethylaluminum sesquichloride in homogeneous toluene solution, gives such an equimolar copolymer regardless of the initial monomer compositions. The NMR spectra of these copolymers are distinctly different from those of the equimolar copolymers obtained with azobisisobutyronitrile as initiator and have simpler and well separated patterns. The copolymers and the corresponding radical copolymers appear to be amorphous, judged by their x-ray diffraction patterns and their differential thermal analyses. Their infrared spectra resemble each other very closely. Hence, the difference in the NMR spectra may be ascribed to the matter of the sequence distribution. The infrared spectrum of ethylene–methyl acrylate copolymer shows no absorption near 720 cm.?1 due to the methylene sequence arising from ethylene–ethylene linkage. These experimental data lead to the inference that the equimolar copolymers obtained in this work may have an alternating sequence. 相似文献
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Masaaki Hirooka Hiroshi Yabuuchi Shohachi Kawasumi Kohei Nakaguchi 《Journal of polymer science. Part A, Polymer chemistry》1973,11(6):1281-1306
The monomer reactivity in the complexed copolymerization of vinyl compounds with alkylaluminum halides has been extensively surveyed. Equimolar copolymers were obtained in various combinations of monomers which are classified into two monomer groups, A and B. The group B monomers are conjugated vinyl compounds having nitrile or carbonyl groups in the conjugated position and form complexes with alkylaluminum halides. The group A monomers are donor monomers having low values, such as olefins, haloolefins, dienes, and unsaturated esters. These A monomers belong to the same group of monomers which give alternating copolymers in conventional radical copolymerization with maleic anhydride, SO2, and so on. In addition the complexed copolymerization has the same specific characteristics as the conventional alternating copolymerization, i.e., high reactivities of allyl-resonance monomers and inner olefins and no transfer of halogen atom to the copolymers in CCl4. These features suggest little or no participation of the A monomer radical. The Q-e scheme is also discussed in terms of the monomer reactivity. More than two monomers selected from groups A and B give multicomponent copolymers in which alternating sequential structures hold with respect to A and B. Anomalous mutual reactivities between two B monomers in the terpolymerization were observed and indicate that the nature of radical in the complexed copolymerization may be different from that expected by the Lewis-Mayo equation. The complexed radical mechanism previously proposed is discussed in connection with the specific behavior mentioned above. 相似文献