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	1. Synthesis and photoluminescence properties of CTAB-encapsulated semiconductor quantum dots
	DAI Dejian,GUO Xiaoxiao,FAN Jiyang
	Physics 07 December 2012
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	Abstract:The multilayered cetyltrimethylammonium bromide (CTAB) vesicle centered on one or a couple of colloidal SiC quantum dots (QDs) was synthesized. The Coulomb attraction force between the negatively charged surface of the QD and the positively charged ionized CTAB molecules drives formation of the novel multilayered vesicles via self-assembly. The CTAB vesicles show near-UV photoluminescence which is enhanced with respect to the individual CTAB molecules. This novel synthesis method can be generalized to synthesize a large group of diverse QD/vesicle core/shell structures.
	TO cite this article:DAI Dejian,GUO Xiaoxiao,FAN Jiyang. Synthesis and photoluminescence properties of CTAB-encapsulated semiconductor quantum dots[OL].[ 7 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4501647


	2. Temperature Induced Spin Relaxation in Organic Semiconductors
	YIN Sun
	Physics 30 November 2012
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	Abstract:Spin relaxation due to energy level fluctuation in organic semiconductors is investigated by solving the Liouville equation of a two-level system with diagonal Hamiltonian elements being described by stochastic processes. When the polaron pair situates on one molecule, or an exciton, no spin relaxation is possible. In the opposite case when the coupled polaron pair distributes in two neighboring molecules, the relaxation occurs between spin singlet and one of the spin triplet states but not between spin triplet states.
	TO cite this article:YIN Sun. Temperature Induced Spin Relaxation in Organic Semiconductors[OL].[30 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4499446

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	3. The Study of the contribution of the LHT model to Zbb coupling
	YANG Bingfang,HAN Jinzhong,WANG Xuelei
	Physics 24 November 2012
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	Abstract:In the framework of the Littlest Higgs Model with T-parity (LHT), we study the contributions of the new particles to Zbb couplings at one-loop level. Based on these results, we further study the branching ratio R_{b} and the unpolarized forward-backward asymmetry A_{FB}^{b}. We find that the correction of the new particles to Zbb couplings is mainly on the left-handed coupling and has small part of the parameter space to alleviate the deviation between theoretical predictions and experimental values. The precision measurement value of R_{b} can give severe constraints on the relevant parameters. The constraints from the precision measurement value of A_{FB}^{b} are very weak.
	TO cite this article:YANG Bingfang,HAN Jinzhong,WANG Xuelei. The Study of the contribution of the LHT model to Zbb coupling[OL].[24 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4496196


	4. Contribution of the LHT model to the Zcc Coupling
	WANG Yabin,HAN Jinzhong,YANG Bingfang,WANG Xuelei
	Physics 24 November 2012
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	Abstract:In the littlest Higgs model with T-parity(LHT), some new particles, such as the T-odd mirror quarks and goldstone bosons, can generate the contribution to some observables. We calculate their contribution to the Zcc coupling. Some observables are related to the Zcc coupling, for example, the effective vector and axial-vector Zcc coupling constants (g_{Vc},g_{Ac}) and the c-quark forward-backward asymmetry(A_{FB}^{c}). We give our predictions about g_{Vc},g_{Ac} in the LHT model and show the allowed regions of the mirror quark masses based on the experimental data of g_{Vc}-g_{Ac}.Then, we also give an explanation on A^{c}_{FB}.
	TO cite this article:WANG Yabin,HAN Jinzhong,YANG Bingfang, et al. Contribution of the LHT model to the Zcc Coupling[OL].[24 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4496202


	5. Enhanced dielectric and magnetic properties in Ru and La co-doped BiFeO3 ceramics
	LIU Weifang,GONG Yufei
	Physics 18 November 2012
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	Abstract:Multiferroic ceramics Bi0.9La0.1Fe1-xRuxO3 (x = 0%, 1% and 3%) were prepared using a solid-state reaction process. The structural transformation from rhombohedral to pseudocubic was confirmed in the Ru-doped samples via x-ray diffraction investigation, and the improved dielectric properties are ascribed to the morphotropic phase boundary and decreased oxygen defects existing in the Ru-substituted samples. The enhancement of magnetization is interpreted by the increased Fe3+ ions and the formation of a local 'ferrimagnetic' structure in the Ru-doped samples.
	TO cite this article:LIU Weifang,GONG Yufei. Enhanced dielectric and magnetic properties in Ru and La co-doped BiFeO3 ceramics[OL].[18 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4494763


	6. Notable Influence of Orthorhombic-Tetragonal Phase Transition on Microwave Dielectric Dispersion in BaTiO3 Ceramic
	ZHANG Jialiang,HAO Wentao,ZHENG Peng,TAN Yongqiang,JI Pengfei,WANG Chunlei
	Physics 16 November 2012
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	Abstract:Temperature-stable, frequency-independent and low-loss dielectric properties are usually essential for a high-permittivity ferroelectric material to be practically applied in microwave devices. BaTiO3 ceramics are a type of important ferroelectric material in the viewpoints of both fundamental studies and technological applications. However, investigations of the microwave dielectric dispersion below room temperature have been rarely carried out so far. In this study, the temperature evolution of dielectric dispersion was examined for a coarse-grained BaTiO3 ceramic in the frequency range from 40 Hz to 1 GHz and over the temperature interval between -50 and 180 C, which thus includes the orthorhombic-tetragonal polymorphic phase transition and covers the large part of common usage temperature region. An important physical phenomenon that the phase transition has a notable influence on the microwave dielectric dispersion has been clearly disclosed. The dielectric permittivity ε' shows a maximum whereas the characteristic frequency fr exhibits a minimum in the vicinity of orthorhombic-tetragonal phase transition temperature. In addition, large difference in fr is observed between the heating process and the cooling process in the tetragonal phase. It is considered that the experimentally found phenomenon can be explained by the previously suggested mechanism of the emission of elastic shear waves from ferroelastic domain walls.
	TO cite this article:ZHANG Jialiang,HAO Wentao,ZHENG Peng, et al. Notable Influence of Orthorhombic-Tetragonal Phase Transition on Microwave Dielectric Dispersion in BaTiO3 Ceramic[OL].[16 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4496187


	7. Bimetallic nanostructures with magnetic and noble metals and their physicochemical applications
	DUAN Sibin,WANG Rongming
	Physics 08 November 2012
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	Abstract:Bimetallic nanomaterials consisting of magnetic metals and noble metals have attracted much interest for their promising potentials in the fields such as magnetic sensors, catalysts, optical detection and biomedical applications. Bimetallic nanomaterials synthesized by wet-chemical methods with different architectures including nanoparticles, nanowires or nanotubes and their assemblies are summarized in this review. The particular properties of bimetallic nanomaterials, especially their magnetic, catalytic and optical properties, are presented. The advance in electron microscopy makes it possible to understand the nanostructural materials at much higher level than before, which helps to disclose the relationship between the microstructures and properties qualitatively and quantitatively.
	TO cite this article:DUAN Sibin,WANG Rongming. Bimetallic nanostructures with magnetic and noble metals and their physicochemical applications[J].


	8. Design and Simulation of a Trap-based Pulsed Slow Positron Beam
	He Chunqing,Wang Juncheng,Zhu Jun,Wang Shaojie
	Physics 30 October 2012
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	Abstract:A simple pulsed slow positron beam based on a Penning-trap has been designed and is being constructed in Wuhan University. The cooled positrons from the trap with very low energy dispersion are dumped and chopped to pulses of a few tens of ns in width. Positron pulses are bunched by adjusting the potential of drift tube using an arbitrary wave generator, then accelerated to the target. Influences of the pulse width, the energy dispersion of positrons etc. on the time resolution of bunched positron pulse are simulated. The result shows that lower energy dispersion of positrons leads to much narrower positron pulses, indicating that a trap-based slow positron beam has a great advantage in developing a pulsed slow positron beam.
	TO cite this article:He Chunqing,Wang Juncheng,Zhu Jun, et al. Design and Simulation of a Trap-based Pulsed Slow Positron Beam[OL].[30 October 2012] http://en.paper.edu.cn/en_releasepaper/content/4493655


	9. FORC diagrams of Magnetic perpendicular recording media
	Yin Jinhua,Chen Jingsheng,Wu Lianjun
	Physics 07 October 2012
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	Abstract:First Order Reversal Curve (FORC) diagrams have been investigated in perpendicular media. Our samples include Co/Pd multilayer and FePt films with different α (M-H loop slope parameter, α = 4α (dM/dH) at H=Hc). α can be used to characterize the exchange coupling between the grains in perpendicular media. It is found that the FORC diagrams of perpendicular media with strong exchange coupling are quite different from that of perpendicular media with weak exchange coupling. Because the FORC diagrams can separate the distributions of magnetic phases with different magnetic properties, we expect the FORC diagram is a possible method for us to investigate separately the magnetic properties of different magnetic phases in one sample. We compared our FORC diagram results with XPS and magnetization decay measurement.
	TO cite this article:Yin Jinhua,Chen Jingsheng,Wu Lianjun. FORC diagrams of Magnetic perpendicular recording media[OL].[ 7 October 2012] http://en.paper.edu.cn/en_releasepaper/content/4491156


	10. Upconversion luminescence properties of Yb3+ and Tm3+ codoped amorphous ?uoride ZBLAN thin ?lm prepared by pulsed laser deposition
	He Chunfeng,qinguanshi,zhaodan,chuaixiaohong,wanglili,qinweiping
	Physics 23 July 2012
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	Abstract:This paper reports on the spectroscopic properties and energy transfer analysis of Yb3+ and Tm3+ co-doped 55.98ZrF4-28BaF2-2.5LaF3-4AlF3-7NaF-2.5YbF3-0.02TmF3 amorphous ?uoride ?lm prepared by pulsed laser deposition. This glass thin ?lm has the potential application for integrated optical waveguide ampli?er and laser. Ultraviolet and visible up-conversion emissions were observed under infrared excitation at 980 nm. In comparison with that of the target, the upconversion emissions are enhanced greatly. The possible mechanism of the emissions was given.
	TO cite this article:He Chunfeng,qinguanshi,zhaodan, et al. Upconversion luminescence properties of Yb3+ and Tm3+ codoped amorphous ?uoride ZBLAN thin ?lm prepared by pulsed laser deposition[OL].[23 July 2012] http://en.paper.edu.cn/en_releasepaper/content/4485487

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