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Synthesis and characterization of nanoparticle of TiO2 co-doped with Sc3+ and V5+ ions
Dong Ri Zhang,김영환,강영수 한국물리학회 2006 Current Applied Physics Vol.6 No.4
Nanoparticle of TiO2 co-doped with Sc3+ and V5+ ions was synthesized by the solgel method and calcinated at 500.C. Particlesize of TiO2 + 2.0 at.% (Sc + V) calculated from XRD spectrum is 16.2 nm. The size and shape of nanoparticles synthesized werealso obtained by transmission electron microscopy (TEM) and mean diameter of particle was determined as 17.4 ± 5.4 nm, whichis in agreement with that of calculated from XRD spectrum. Image from high-resolution transmission electron microscopy(HRTEM) study on the sample exhibited well-dened lattice fringe. Elemental analysis was conducted by energy-dispersive X-ray microanalysis (EDX) and conrmed the presence of Sc3+ and V5+ ions in the TiO2 matrix.
Synthesis of Sc and V-doped TiO2 nanoparticles and photodegradation of rhodamine-B
Dong Ri Zhang,Hai Lan Liu,Shun Yu Han,Wen Xiang Piao 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
Anatase TiO2 nanoparticles doped with Sc and V were synthesized and their photocatalytic activities were evaluated through the photodegradation of rhodamine-B under UV irradiation. TiO2 shows the highest photocatalytic activity and Sc doped TiO2 and V doped TiO2 show lower photocatalytic activity than TiO2. In contrast, Sc and V codoped TiO2 shows no any photocatalytic activity. The reasons for the decrease in photocatalytic activity is due to the presence of surficial Sc2O3 islands covering the reactive sites for Sc doped TiO2 and the increased e-/h+ pair recombination resulted from the high level substitutional V(IV) ions for V doped TiO2, respectively.
Research on Control Optimization for Bonnet Polishing System
Pan Ri,Wang Zhen-Zhong,Wang Chun-Jin,Xie Yin-Hui,Zhang Dong-Xu,Guo Yin-Biao 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
Aspheric optical lenses are conventionally polished with continuous precession by 5-axis bonnet polishing system. In this work, in order to achieve that aspheric lenses be processed by four-axis simultaneous NC (numerical control) machining system, one kind of control algorithm was proposed by controlling the error of precession angle. Firstly, on the basis of the analysis of the structure of bonnet tool and processing technology of aspheric optics, ranges of important parameters in machining process such as the angle between spin axis of bonnet tool and negative vertical direction and the precession angle were fixed, to make the minimum errors of precession angle as small as possible; Secondly, the control algorithm was introduced, aimed to reduce the existing errors of precession angle in polishing process by making micro migration of machining points. Then, simulation experiments of polishing non-axisymmetric aspheric lenses were carried out to validate the suggested control algorithm, the results revealed that the maximum error of precession angle was decreased to about 0.01°, which is available in real processing.
Studies on SBR and EVA Surfaces Treated with New Adhesion Activators
Hong, Yong Pyo,Zhang, Dong Ri,Oh, Sun Wha,Ahn, Byung Hyun,Kang, Young Soo 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.5
New types of adhesion activators, Lichlor-6 (consisting of lithium chlorohexylisocyanurate and lithium dichloroisocyanurate), Lichlor-7 (consisting of lithium chloroheptylisocyanurate and lithium dichloroisocyanurate), and Nachlor-6 (consisting of sodium chlorohexylisocyanurate and sodium dichloroisocyanurate), which can be dissolved in water instead of harmful organic solvents, were synthesized to allow surface treatment to improve the adhesion between polymer surfaces. The surfaces of styrene-butadiene rubber (SBR) and ethylene vinyl acetate (EVA) were treated with 2 wt% solutions of Lichlor-6, Lichlor-7, and Nachlor-6, respectively. Waterborne polyurethane (PU) adhesive was used to joint the treated surfaces of SBR and EVA. The water contact angles of the SBR and EVA surfaces decreased noticeably because of the increased surface roughness caused by treatment with the 2 wt% adhesion activators; the decreases in the contact angles of the SBR surfaces are larger than those of the EVA surfaces because of the more-polar group (silica) present in the SBR than that in the EVA. Easier breaks of joints occurred in the layer between the EVA and PU adhesive as a result of the higher contact angles on the EVA surfaces than those on the SBR surfaces. The tested tear resistance values of joints increased in the order Lichlor-6, Lichlor-7, and Nachlor-6. This order is in good agreement with the order of the relative intensities of the polar group bands in the ATR-IR spectra of EVA.
Lee, Don-Keun,Zhang, Dong-Ri,Kang, Youn-Soo Korean Magnetic Resonance Society 2002 Journal of the Korean Magnetic Resonance Society Vol.6 No.2
The photoproduced cation radical of N-methylphenothiazine $(PC_1)$ doped into phenyltriehtoxysilane (PhiTEOS), vinyltriethoxysilane (VTEOS) and methyltriethoxysilane (METOS) was studied with electron spin resonance (ESR) and electron nuclear double resonance (ENDOR). The photoinduced charge separation efficiency was determined by integration of ESR spectra which correspond to the amount of photoproduced cation radical in the matrices. This was correlatively studied with the polarity and pore size of the gel matrices. The relative polarity of the matrices was determined by measuring ${\lambda}_{max}$ values of $PC_1$ in the different matrices. The relative pore size among the matrices was determined by measuring relative proton matrix ENDOR line widths of the photoproduced cation of $PC_1$. The decay kinetic constants of the cation radical of $PC_1$ in the different matrices with relatively studied with fitting the biexponential decay curves after exposure at the ambient condition. This is correlatively interpreted with the polarity and pore size of the matrices.
Virtual Queue Based QoS Layered Vertical Mapping in Wireless Networks
( Shu-guang Fang ),( Ri-zhao Tang ),( Yu-ning Dong ),( Hui Zhang ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.6
Wireless communication is one of most active areas in modern communication researches, QoS (Quality of Service) assurance is very important for wireless communication systems design, especially for applications such as streaming video etc., which requires strict QoS assurance. The modern wireless networks multi-layer protocol stack structure results in QoS metrics layered and acting in cascade and QoS metrics vertical mapping between protocol layers. Based on virtual buffer between protocol layers and queuing technology, a unified layered QoS mapping framework is proposed in this paper, in which we first propose virtual queue concept, give a novelty united neighboring protocol layers QoS metric mapping framework, and analysis method based on dicerete-time Markov chain, and numerical results show that our proposed framework represents a significant improvement over previous model.
Xiao-Qiang, Shao,Jing-Ji, Wen,Xing-Ri, Jin,Ai-Dong, Zhu,Shou, Zhang,Kyu-Hwang, Yeon Science Press 2007 Chinese physics letters Vol.24 No.10
<P>A scheme for implementing a Fredkin gate with an atom sent through a microwave cavity is proposed. The scheme is based on the resonant atom-cavity interaction so that the gating time is sharply short, which is important in view of decoherence.</P>