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1. VLEED sensitivity ot bond geometry and potential parameters | |||
Sun Changqing | |||
Chemistry 07 September 2005 | |||
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Abstract:The critical examination of the spectral sensitivity to the Cu(001)-O surface provides evidence for that the VLEED are highly more sensitive to the bonding geometry than individual atomic-shift. The shapes of the fine-structure features are dominated by the elastic potential that determines thephase change of the diffracted beams. The inelastic potential influences on the absolute intensity other than the shape of the I-V curve. It is justified that the inelastic damping is predominated by the outermost layer. Therefore the VLEED is such a technique that it is able to reveal nondestructive information from the overlayer integrating the bond forming and the behaviour of surface electrons. | |||
TO cite this article:Sun Changqing. VLEED sensitivity ot bond geometry and potential parameters[OL].[ 7 September 2005] http://en.paper.edu.cn/en_releasepaper/content/2819 |
2. Cu3O2 pairing tetrahedron at Cu(001) surface: aging and relaxation | |||
Sun Changqing | |||
Chemistry 06 September 2005 | |||
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Abstract:It is shown that the Cu3O2 paring tetrahedron formed at Cu(001) surface will suffer dehybridization under annealing. | |||
TO cite this article:Sun Changqing. Cu3O2 pairing tetrahedron at Cu(001) surface: aging and relaxation[OL].[ 6 September 2005] http://en.paper.edu.cn/en_releasepaper/content/2802 |
3. Electronic process of Cu(Ag, V, Rh)-(001) surface oxidation: atomic valences and bonding kinetics | |||
Sun Changqing | |||
Chemistry 09 August 2005 | |||
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Abstract:The electronic processes of Cu(Ag, V, Rh)(001) surface oxidation are comparatively analyzed based on the recent ‘chemical bond – valence band – potential barrier’ (BBB) correlation mechanism [C. Q. Sun, Prog. Mater. Sci. 48, 521-685 (2003)], which allows reaction formulae for all the observed phases with identification of individual atomic valence and the binding kinetics at the surfaces with the same geometry. It is consistently understood that the forming kinetics of the primary oxide tetrahedron and its derivative on the valence density-of-states are intrinsically common for all these analyzed systems, though the patterns of observation in terms of morphology and crystallography vary from situation to situation. However, the lattice size and electronegativity of the host surfaces determine extrinsically the site selectivity of the oxygen, the order of bond formation and the orientation of the oxide tetrahedron. | |||
TO cite this article:Sun Changqing. Electronic process of Cu(Ag, V, Rh)-(001) surface oxidation: atomic valences and bonding kinetics[OL].[ 9 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2631 |
4. Estimating the extent of surface oxidation by measuring the porosity dependent dielectrics of oxygenated porous silicon | |||
L. K. Pan,Sun Changqing,C. M. Li | |||
Chemistry 02 August 2005 | |||
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Abstract:Surface oxidation and porosity variation play significant roles in the dielectric performance of porous silicon (PS) yet discriminating the contribution of these events is a challenge. Here we present an analytical solution that covers contributions from the components of silicon oxide surface, silicon backbone and voids using a serial-parallel capacitance structure. Agreement between modeling predictions and measurement has been realized, which turns out an effective method that enables us to estimate the extent of surface oxidation of a specimen by measuring the porosity dependent dielectric response of the chemically passivated PS, and provides guidelines that could be useful for designing dielectric porous structures with surface oxidation. | |||
TO cite this article:L. K. Pan,Sun Changqing,C. M. Li. Estimating the extent of surface oxidation by measuring the porosity dependent dielectrics of oxygenated porous silicon [OL].[ 2 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2587 |
5. Four-stage Cu3O2 bonding quantum kinetics | |||
Sun Changqing | |||
Chemistry 19 July 2005 | |||
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Abstract:Four-stage Cu3O2 bonding quantum kinetics on Cu(001) surface has been quantified with the combinaion of STM and LEED. | |||
TO cite this article:Sun Changqing. Four-stage Cu3O2 bonding quantum kinetics[OL].[19 July 2005] http://en.paper.edu.cn/en_releasepaper/content/2483 |
6. Low and wide phase transition temperature dimesogenic compounds consisting of a cholesteryl and 4-( trans- 4-n-alkylcyclohexyl) phenoxy mesogens | |||
Chunbo Zhang,Zhiqi Cong,Bingzhu Yin | |||
Chemistry 30 May 2005 | |||
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Abstract:Unsymmetrical dimesogenic compounds having cholesteryl and 4-trans- (4-n -alkylcyclohexyl) phenoxy group were synthesized by condensation of cholesterylω-bromopentanoates with appropriate 4-trans- (4-n-alkylcyclo- hexyl) phenols. Structures and thermal phase behaviour of these dimers have been confirmed by IR, 1H NMR , elemental analysis,DSC,polarity microscopy and XRD measurements. Their thermal phase behaviour is significantly different to that of other cholesterol-based liqud crystalline dimmers which having low and wide phase transition temperature. | |||
TO cite this article:Chunbo Zhang,Zhiqi Cong,Bingzhu Yin. Low and wide phase transition temperature dimesogenic compounds consisting of a cholesteryl and 4-( trans- 4-n-alkylcyclohexyl) phenoxy mesogens[OL].[30 May 2005] http://en.paper.edu.cn/en_releasepaper/content/2124 |
7. Investigation on the rate of reaction between gas (CO2) and liquor (NaOH) phases | |||
Chen Bin,LI Xiao-bin,LIU Gui-hua | |||
Chemistry 26 April 2005 | |||
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Abstract:The neutralization of sodium hydroxide by carbon dioxide occurring during the process of carbonization precipitation of sodium aluminate solution was investigated. Firstly, the effects of those main factors such as CO2 concentration、temperature、initial concentration of NaOH were investigated. Then the kinetics equation concerning this reaction was obtained after proper data treatment. The results showed that it assumes an apparent activation energy of 8.06 kJ/mol which indicated a diffusion-controlled process. Furthermore, based on the principles governing diffusion-controlled process, the dependence of neutralization rate on gas flow was deduced theoretically with a form as: rd=KDKCA(Q/VL)2/3 whose plausibility was validated by those experimental research thereafter. | |||
TO cite this article:Chen Bin,LI Xiao-bin,LIU Gui-hua. Investigation on the rate of reaction between gas (CO2) and liquor (NaOH) phases[OL].[26 April 2005] http://en.paper.edu.cn/en_releasepaper/content/1933 |
8. Synthesis and Characterization of Mesoprous Europium ( III ) Silicate Molecular Sieves | |||
Yin Wei | |||
Chemistry 25 April 2005 | |||
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Abstract:he luminescent nanosized Eu-MCM (1:10) is synthesized by means of sol-gel-assisted self-assembly under basic conditions at room temperature. That result of 29Si-MAS NMR show that the peaks are Q4, Q3, Q2 [ (SiO)4-mSi–(OH)m ( m = 0, 1, 2 ), at –111, –103, –90 ppm ], and q3, q2, q1, q0 [ (SiO)4-nSi–(O–Eu)n ( n=1, 2, 3, 4 ), at –83, –72, –55, –47 ppm ]. The result proves that Eu3+ doped Si-O framework. The HRTEM image shows that the regular uniform nanoparticles with a diameter of 15 nm possess ultralarge pore with Æ8nm, which is consistent with the result of N2 Adsorption. The patterns of selected-area electron diffraction, XRD, and pore-size distribution plot of Eu-MCM (1:10) show The results show that the sample of Eu-MCM (1:10) possesses the both of crystal and amorphous phases. The FTIR results indicate that the peaks near 970cm-1 are assigned to the deformation vibration of silanol group. The as-product is calcined at 800 oC and the mesoporous material possess enormous specif | |||
TO cite this article:Yin Wei. Synthesis and Characterization of Mesoprous Europium ( III ) Silicate Molecular Sieves[OL].[25 April 2005] http://en.paper.edu.cn/en_releasepaper/content/1917 |
9. Oscillations of partial oxidation of methane over H-ZSM-5 supported rhodium catalyst | |||
Ying Liu | |||
Chemistry 04 April 2005 | |||
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Abstract:The oscillatory behavior over the Rh/H-ZSM-5 catalyst was firstly reported at atmospheric pressure during the partial oxidation of methane. Temperature programmed techniques such as TPO and TPR were performed to look into the reaction mechanism. The results obtained from the experimental studies indicate that the synergism of the coke of some kind of stable form and the oxide which could be switching back and forth from the reduced state to the oxidized state is responsible for the oscillatory behavior seen in this system. | |||
TO cite this article:Ying Liu. Oscillations of partial oxidation of methane over H-ZSM-5 supported rhodium catalyst[OL].[ 4 April 2005] http://en.paper.edu.cn/en_releasepaper/content/1797 |
10. On rotation uncertainty in the resolution of two-way evolving data | |||
Feng Gan | |||
Chemistry 17 March 2005 | |||
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Abstract:This paper shows that two-way evolving data does not have the rotation uncertainty problem itself. The so-called rotation uncertainty problem comes from the convergence criterion of minimum squared residual. It is possible to solve the problem by introducing proper convergence criterion. | |||
TO cite this article:Feng Gan. On rotation uncertainty in the resolution of two-way evolving data[OL].[17 March 2005] http://en.paper.edu.cn/en_releasepaper/content/1714 |
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