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	1. Lorentz, Edwards transformations and the principle of permutation invariance
	Shen Jianqi
	Physics 29 August 2005
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	Abstract:The Lorentz transformation is derived without the postulate of the universal limiting speed, and the general Edwards transformation is obtained by using the principle of permutation invariance (covariance). It is shown that the existences of the one-way universal limiting speed (in the Lorentz transformation) and the constancy of the two-way average speed of light (in the Edwards transformation) are the necessary consequences of the principle of permutation invariance that is consistent with the postulate of relativity. The connection between the Edward transformation and the general coordinate transformation is discussed, and based on this, we find that the physical meaning of the Edward parameter, which indicates the anisotropy of the speed of light, is a gravitomagnetic potential of the spacetime.
	TO cite this article:Shen Jianqi. Lorentz, Edwards transformations and the principle of permutation invariance[OL].[29 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2739


	2. Blue shift in CdS and CdSe nanosemiconductors: Quantum confinement or quantum uncertainty?
	Sun Changqing,S. LI, B. K. TAY ,T. P. CHEN
	Physics 12 August 2005
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	Abstract:Blue shift of semconductor nanosolids is shown arise from surface bond contraction rather than "quantum confinement" that disobeies the principle of "quantum uncertainty".
	TO cite this article:Sun Changqing,S. LI, B. K. TAY , et al. Blue shift in CdS and CdSe nanosemiconductors: Quantum confinement or quantum uncertainty?[OL].[12 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2653

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	3. Mass, charge and energy densification of nanostructures: Principle and applications
	Sun Changqing
	Physics 11 August 2005
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	Abstract:As consequences of the CN imperfection caused surface bond contraction, desification of charge, mass, and densification and localization of charges happens to the surface skin of a nanosolid, which dictate the tunability of nanostructures in almost all aspects.
	TO cite this article:Sun Changqing. Mass, charge and energy densification of nanostructures: Principle and applications[OL].[11 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2647


	4. Temperature-Independent Fiber Bragg Grating Micro-displacement Sensor
	Guo Tuan ,Zhao Qida ,Liu Lihui ,Huang Guiling ,Xue Lifang,Yan Yu ,Gao Shiyu
	Physics 11 August 2005
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	Abstract:Temperature-Independent micro-displacement measurement using a single fiber Bragg grating based on broadened reflection spectrum is proposed and experimentally demonstrated. The structure of specially designed bending cantilever beam (BCB) is proposed. The BCB induces axial strain gradient along the sensing FBG, resulting in a Bragg bandwidth modulation. The broadening of FBG spectrum bandwidth and the reflected optical power are corresponded to micro-displacement changes, insensitive to spatially uniform temperature variations. For a displacement variation of 20mm and a temperature change from 20℃ to 100℃, the micro-displacement measurement deviation error of 0.48mm without any temperature compensation. Through optical power detecting by a pin-photodiode (PD), the micro-displacement sensor avoids complex demodulation process and potentially costs low.
	TO cite this article:Guo Tuan ,Zhao Qida ,Liu Lihui , et al. Temperature-Independent Fiber Bragg Grating Micro-displacement Sensor[OL].[11 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2644


	5. Evidence for surface bond contraction
	Sun Changqing,S. Li,B. K. Tay
	Physics 09 August 2005
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	Abstract:Experimental evidence is given on the surface bond contraction induced by coordination imperfection of atoms in the surface skin.
	TO cite this article:Sun Changqing,S. Li,B. K. Tay . Evidence for surface bond contraction[OL].[ 9 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2629


	6. Size effect on the melting point and E-4f level shift of gold nanosolid
	Sun Changqing, H. L. Bai,S. Li,B. K. Tay,E. Y. Jiang
	Physics 05 August 2005
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	Abstract:onsistent insight into the size-enhanced E4f-level shift and the size-suppressed melting point of Au nanosolids has been obtained based on the bond order-length-strength (BOLS) correlation mechanism [Sun, et al, Acta Materialia 51, 4631 (2003)]. Consistency between theory predictions and observations reveals that the atomic-coordination number (CN) imperfection induced bond contraction and the associated bond-energy increase dictate these changes. The increase of binding energy density per unit volume in the relaxed surface region perturbs the Hamiltonian that determines the core level shift; the decrease of atomic cohesive energy (a product of atomic CN and the single bond energy) determines the thermal energy required for melting. Extending the knowledge to the lower end of the size limit suggests that the metallic bond in the gold monatomic-chain contracts by ~30% associated with ~43% magnitude rise of the bond energy. The crystal binding intensity contributing from all the atoms i
	TO cite this article:Sun Changqing, H. L. Bai,S. Li, et al. Size effect on the melting point and E-4f level shift of gold nanosolid[OL].[ 5 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2607


	7. Size dependence of acoustic, dielectric and photoelectronic behaviour of nanosolid silicon
	Sun Changqing
	Physics 26 July 2005
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	Abstract:Structural miniaturization provides us with a new freedom that is indeed fascinating. The new freedom of size not only allows us to tune the physical and chemical properties of a specimen by simply adjusting the shape and size but also enables us to gain information that is beyond the scope of conventional approaches. Here we show that a recent bond order-length-strength (BOLS) correlation could reconcile the size effect on nanosolid silicon with elucidation of information such as the single energy level of an isolated Si atom, the frequency of Si-Si dimer vibration, the upper limit of photoabsorption/emission, and dielectric suppression.
	TO cite this article:Sun Changqing. Size dependence of acoustic, dielectric and photoelectronic behaviour of nanosolid silicon[OL].[26 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2532


	8. Spectroscopic analysis of LiKGdF5:Er3+,Sm3+ single crystal
	DONG Ning
	Physics 25 July 2005
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	Abstract:Low temperature photoluminescence spectra were measured under the selective excitation to the energy levels of Gd3+, Er3+ and Sm3+ respectively. Corresponding transitions were assigned with the help of fluorescence decay measurements. By assuming that the rare earth ion is in C2v symmetry instead of the actual C2, crystal field calculations were carried out based on the deduced experimental energy level data of Er3+ and Sm3+. The theoretical result is in good agreement with the experimental data. The tendency of crystal field parameters was also discussed.
	TO cite this article:DONG Ning. Spectroscopic analysis of LiKGdF5:Er3+,Sm3+ single crystal[OL].[25 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2517


	9. Thermally tuning of the photonic band gap of SiO2 colloid crystal infilled with ferroelectric BaTiO3
	Sun Changqing,
	Physics 18 July 2005
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	Abstract: SiO2 colloid crystal infilled with BaTiO3 was synthesized by a process of self-assembly in combination of sol-gel technique. It is found that infilling the fully crystallized BaTiO3 into the colloid assembly can enhance the photonic band gap significantly. In the vicinity of the ferroelectric phase transition point of BaTiO3 (100-150oC), the photonic band gap of the assembly exhibits a strong temperature dependence. At the Curie point, the band gap has a 20 nm redshift and the optical transmittance reaches its minimum. Such a temperature-tuning effect in photonic band gap should be of high interest in device application.
	TO cite this article:Sun Changqing,. Thermally tuning of the photonic band gap of SiO2 colloid crystal infilled with ferroelectric BaTiO3[OL].[18 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2475


	10. Effects of surface passivation and interfacial reaction on the size-dependent 2p-level shift of supported copper nanosolids
	Sun Changqing
	Physics 15 July 2005
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	Abstract:Effects of surface passivation and particle-substrate interfacial reaction on the size dependent 2p3/2-level shift of nanosolid Cu have been numerically analyzed, leading to information about the reactivity of Cu nanosolid with different substrates, such as graphite, polymer and alumina. It has been found that Ar+ bombardment promotes the Cu-polymer reaction and N+ passivation strengthens the surface bond due to nitride formation. Cu atom interacts with alumina slightly stronger at room temperature than at 80 K. Matching predictions to the measured size-dependent Cu-2p level shift reveals that the intra-atomic trapping energy of a core electron at the Cu 2p3/2-level is -931.0 eV and the bulk crystal bonding intensity to the 2p3/2 electron is -1.70 eV, which is beyond the scope of conventional approaches.
	TO cite this article:Sun Changqing. Effects of surface passivation and interfacial reaction on the size-dependent 2p-level shift of supported copper nanosolids[OL].[15 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2458

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