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1.
The thermodynamics structural relaxation of Fe73Cu1.5Nd3Si13.5B9 amorphous alloy from room temperature to 400°C has been investigated by measuring the structure factor with in situ X-ray diffraction. The structural information of the atomic configuration such as radial distribution function (RDF) and
neighbor atomic distance was gained by Fourier transformation. The research result shows that the amorphous structure remains
stable in the temperature range of 30 to 400°C but exhibits distinct changes in local atomic configuration with the increase
of temperature. The quantitative determination of the neighbor atomic distance suggests that the degree of short-range order
changes by the temperature altering the second nearest neighbor local atomic configuration of the amorphous when structural
relaxation occurs.
Supported by the Natural Science Foundation of Hebei Province of China (Grant No. A2007000296), the National Natural Science
Foundation of China (Grant No. 50731005), SKPBRC (Grant Nos. 2007CB616915 and 2006CB605201), and PCSIRT (Grant No. IRT0650) 相似文献
2.
First-principles study of interphase Ni3Sn in Sn--Ni alloy for anode of lithium ion battery
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This paper investigates the mechanism of Li insertion into interphase Ni3Sn in Ni-Sn alloy for the anode of lithium ion battery by means of the first-principles plane-wave pseudopotential. Compared with other phases, it is found that the Ni3Sn has larger relative expansion ratio and lower electrochemical potential, with its specific plateaus voltage around 0.3 eV when lithium atoms are filled in all octahedral interstitial sites, and the relative expansion ratio increasing dramatically when the lithiated phase transits from octahedral interstitial sites to tetrahedral interstitial sites. So this phase is a devastating phase for whole alloy electrode materials. 相似文献
3.
The probability of successful controlled teleportation of an unknown qubit using a general three-particle state is investigated.
The analytic expressions of maximal probabilities via several kinds of tripartite states are given, including a tripartite
Greenberger-Horne-Zeilinger state and a tripartite W-state.
Supported by the National Natural Science Foundation of China (Grant No. 10671054), the Key Project of Science and Technology
Research of Ministry of Education of China (Grant No. 207011), and the Natural Science Foundation of Hebei Province, China
(Grant No. 07M006) 相似文献
4.
The transmission characteristics of a metallic film with subwavelength ellipsoid nanohole arrays are investigated by using
the three-dimensional finite-difference time-domain (3D-FDTD) method. The extraordinary transmission is attributed to the
collaboration of localized waveguide resonance and surface plasmon resonance. The influences of the lattice constant and the
hole shape on the transmission are studied. By analyzing the picture of electric field and electromagnetic energy distribution,
we show the mechanisms of the two different resonances: Localized waveguide resonance mode can be confined inside the ellipsoid
holes region, while electric field and electromagnetic energy are localized separately at the two ends of ellipsoid holes
for the surface plasma resonance mode.
Supported by the National Natural Science Foundation of China (Grant No. 60708014), the Distinguished Youth Foundation of
Hunan Province (Grant No. 03JJY1008), the Science Foundation for Post-doctorate of China (Grant No. 2004035083), and the Natural
Science Foundation of Hunan Province (Grant No. 06JJ20034) 相似文献
5.
A protocol of quantum secret sharing between multiparty and multiparty with four states was presented. It was shown that this
protocol can nullify the Trojan horse attack with a multi-photon signal, the fake-signal attack with Einstein-Podolsky-Rosen
pairs, the attack with single photons, and the attack with invisible photons. In addition, the upper bounds of the average
success probabilities were given for dishonest agent eavesdropping encryption using the fake-signal attack with any two-particle
entangled states.
Supported by the National Natural Science Foundation of China (Grant No. 10671054), the Key Project of Science and Technology
Research of Education Ministry of China (Grant No. 207011) and the Natural Science Foundation of Hebei Province, China (Grant
Nos. A2005000140 and 07M006) 相似文献
6.
XiDong Hui XiongJun Liu Rui Gao HuaiYu Hou HuaZhi Fang ZiKui Liu GuoLiang Chen 《中国科学G辑(英文版)》2008,51(4):400-413
The atomic structures of Zr-Ni and Zr-Ti-Al-Cu-Ni metallic glasses were investigated by using classical molecular dynamic
(MD), reverse Monte Carlo (RMC), ab initio MD (AIMD) simulations and high resolution transmission electron microscopy (HRTEM) techniques. We focused on the short-range
order (SRO) and medium-range order (MRO) in the glassy structure. It is shown that there are icosahedral, FCC-and BCC-type
SROs in the Zr-based metallic glasses. A structural model, characterized by imperfect ordered packing (IOP), was proposed
based on the MD simulation and confirmed by the HRTEM observation. Furthermore, the evolution from IOP to nanocrystal during
the crystallization of metallic glasses was also explored. It is found that the growth from IOP to nanocrystal proceeds through
three distinct stages: the formation of quasi-ordered structure with one-dimensional (1D) periodicity, then 2D periodicity,
and finally the formation of 3D nanocrystals. It is also noted that these three growth steps are crosslinked.
Supported by the National Natural Science Foundation of China (Grant Nos. 50431030 and 50471097), the National Basic Research
Program of China (Grant No. 2007CB613901), and the Programme of Introducing Talents of Discipline to Universities (Grant No.
B07003) 相似文献
7.
The steady-state optical bistability (OB) and optical multistability (OM) behavior in the quasi-Λ-type atomic system driven
by a probe field and a coherent coupling field inside a unidirectional ring cavity are shown, and the effects of coupling-field
detuning and coupling-field intensity on the OB and OM behavior are investigated. The transition from OB to OM or vice versa is found by varying the detuning of the coherent coupling field or by adjusting the intensity of the coupling field. The
influence of the atomic cooperation parameter on the OM behavior is also discussed.
Supported by the Natural Science Foundation of Jiangxi of China (Grant No. 2007GZW0819), the National Basic Research Program
of China (Grant No. 2005CB724508), and the Foundation of Talent of Jinggang of Jiangxi Province (Grant No. 2008DQ00400) 相似文献
8.
ShaoPeng Yang ShanShan Fan ChunLei Li GuoZhi Fan Tao Meng XiaoWei Li GuangSheng Fu Xicheng Ai XiaoHui Zhao JianPing Ye LingXuan Wang 《中国科学G辑(英文版)》2008,51(3):243-250
The fluorescence spectra of three different dyes adsorbed on the tabular and cubic AgBr microcrystals are obtained by the
picosecond time-resolved streak camera technique. The dependence of the ultrafast electron transferring from dye-aggregates
to the conduction band of AgBr and the efficiency of spectral sensitization on different kinds of dyes with different concentrations
is analyzed. Further more, the microcosmic mechanism of the sensitization process is discussed. It is found that the fluorescence
decay curves are fitted very well by the double exponential function, consisting of a slow component and a fast one with large
amplitude. We consider this fast one mainly attributable to the electron transfer from dye J-aggregates to the conduction
band of AgBr.
Supported by the National Natural Science Foundation of China (Grant No. 60478033), the Doctoral Foundation of Hebei Province
of China (Grant No. B2003119), and the Science and Technology Project of Hebei Province of China (Grant No. 05215102) 相似文献
9.
Self-organization effect in poly(3-hexylthiophene): methanofullerenes solar cells 总被引:1,自引:0,他引:1
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This paper studies the self-organization of the polymer in solar cells based on poly(3-hexylthiophene): [6, 6]-phenyl C61-butyric acid methyl ester by controlling the growth rate of active layer. These blend films are characterized by UV-vis absorption spectroscopy, charge-transport dark J - V curve, x-ray diffraction pattern curve, and atomic force microscopy. The results indicate that slowing down the drying process of the wet films leads to an enhanced selforganization, which causes an increased hole transport. Increased incident light absorption, higher carrier mobility, and balanced carrier transport in the active layer explain the enhancement in the device performance, the power conversion efficiency of 3.43% and fill factor up to 64.6% are achieved under Air Mass 1.5, 100 mW/cm^2. 相似文献
10.
The kinetic viscosities of superheated liquids on the Gd-based bulk glass-forming alloys are measured by an oscillating viscometer
in a high vacuum atmosphere. According to the viscosity data, the parameters of superheated liquid fragility, M, are calculated. Based on the values of M in Gd-and Pr-based (cited from the literature) glass-forming alloys, we find that there is a linear correlation between M and the absolute value of mixing enthalpy, |ΔH
mix|, in an alloy system with the same base element, and the larger M, the smaller |ΔH
mix|. The alloy with larger M exhibits the larger height of energy barriers separating the minima on the potential energy landscape.
Supported by the National Basic Research Program of China (973 Program) (Grant No. 2007CB613901), the National Natural Science
Foundation of China (Grant No. 50231040), the Natural Science Foundation of Shandong Province of China (Grant No. Z2004F02),
and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20050422024) 相似文献
11.
The inconsistency of the energy equation used in the literature is pointed out and a new consistent energy equation is given.
With this new energy equation, calculations are made for the limit-cycle behaviors of thermally unstable accretion disks around
black holes. From the comparison of our numerical results with those obtained using the inconsistent energy equation, it is
found that the inconsistent energy equation undervalues the temperature and overvalues the effective optical depth when the
accreted gas becomes effectively optically thin. Thus, it is dangerous if the inconsistent energy equation is used in the
studies of very hot and optically thin accretion flows such as advection-dominated accretion flows (ADAFs), and our new energy
equation is likely to be a better alternative.
Supported by the National Basic Research Program of China (Grant No. 2009CB824800), the National Natural Science Foundation
of China (Grant Nos. 10673009 and 10833002), and the Natural Science Foundation of Fujian Province of China (Grant No. V0750001) 相似文献
12.
Fabrication of metal oxide nanostructures based on Atomic Force Microscopy lithography 总被引:1,自引:0,他引:1
XiaoYang Zhu Gang Cheng ShuJie Wang ShuXi Dai ShaoMing Wan XingTang Zhang ZuLiang Du 《中国科学G辑(英文版)》2008,51(10):1448-1454
Atomic Force Microscopy (AFM) mechanical lithography is a simple but significant method for nanofabrication. In this work,
we used this method to construct nanostructures on Pt/Cu bilayer metal electrodes under ambient conditions in air. The influence
of various scratch parameters, such as the applied force, scan velocity and circle times, on the lithography patterns was
investigated. The Pt-Cu-Cu
x
O-Cu-Pt nanostructure was constructed by choosing suitable scratch parameters and oxidation at room temperature. The properties
of the scratched regions were also investigated by friction force microscopy and conductive AFM (C-AFM). The I–V curves show symmetric and linear properties, and Ohmic contacts were formed. These results indicate that AFM mechanical lithography
is a powerful tool for fabricating novel metal-semiconductor nanoelectronic devices.
Supported by the National Natural Science Foundation of China (Grant No. 90306010), the Program for New Century Excellent
Talents in University of China (Grant No. NCET-04-0653), the National Basic Research Program of China (Grant No. 2007CB616911),
and the Science and Technology Department of Henan Province (Grant No. 072300420100) 相似文献
13.
The reflection in the Savart polariscope is different from the isotropic medium. The double reflection of rays in the Savart
polariscope is analyzed and discussed on the basis of the Snell law. The double reflection formulae of the extraordinary ray
and the ordinary ray are given. These results may provide a theoretical and practical guide for studying, developing and engineering
polarization interference imaging spectrometers.
Supported by the National Natural Science Foundation of China (Grant Nos. 40375010 and 60278019), the Science and Technology
Plan Foundation of Shaanxi Province (Grant No. 2005K04-G18), and the Special Research Project of Shaanxi Provincial Educational
Department (Grant No. 07JK261) 相似文献
14.
The characteristics of pairwise entanglement and local polarization (LP) are discussed by studying the ground state (states)
of the Heisenberg XX model. The results show that: the ground state (states) is (are) composed of the micro states with the minimal polarization
(0 for even qubit and 1/2 for odd qubit); LP and the probability of the micro state have an intimate relation, i.e. the stronger
the LP, the smaller the probability, and the same LP corresponds to the same probability; the pairwise entanglement of the
ground state is the biggest in all eigenvectors. It is found that the pairwise entanglement is decreased by the state degeneracy
and the system size. The concurrence approaches a fixed value of about 0.3412 (for odd-qubit chain) or 0.3491 (for even-qubit
chain) if the qubit number is large enough.
Supported by the National Natural Science Foundation of China (Grant Nos. 10547008, 90403034, 90403019, 90406017 and 60525417),
the National Key Basic Research Special Foundation of China (Grant Nos. 2005CB724508 and 2006CB921400), the Foundation of
Xi’an Institute of Post and Telecommunications (Grant No. 105-0414), and the Natural Science Foundation of Shanxi Province
(Grant No. 2004A15) 相似文献
15.
Through phase transformation kinetic analysis and experimental observation, the δ/γ transformation occurring in the non-equilibrium peritectic Fe-4.33at.%Ni alloys was systematically investigated. According to JMA solid-state transformation kinetic theory, the Time-Temperature-Transformation (TTT) curves of the δ/γ transformation in peritectic Fe-Ni alloy were calculated. On this basis, the physical correlation between the δ/γ transformation and the initial undercooling of melt (△T) was elucidated. The results indicate that the change of △T can alter not only the overall δ/γ transformation pathways but also the transformation fraction with respect to each transformation mechanism. 相似文献
16.
The coherent-entangled state |α, x; λ> with real parameters λ is proposed in the two-mode Fock space, which exhibits the properties of both the coherent and entangled states. The completeness relation of |α, x; λ> is proved by virtue of the technique of integral within an ordered product of operators. The corresponding squeezing operator is derived, with its own squeezing properties. Furthermore, generalized P-representation in the coherent-entangled state is constructed. Finally, it is revealed that superp... 相似文献
17.
A new concept and its methodology for studying human meridians are presented based on rigorous and scientific observation
on the objective existence of human meridians in view of biomedical optics. According to this methodology, the infrared radiant
characteristics of acupuncture meridians over human body and the optical transport properties of light propagating along the
meridian are reported. This study, thus, confirms the existence of acupuncture meridians, sheds new light on an approach to
investigation of human meridians and offers a new perspective in understanding the potential meridian functions such as energy
and information transfer and physiological regulation.
Supported by the National Key Basic Research Program of China (Grant No. 2006CB504505), the National Natural Science Foundation
of China (Grant Nos. 60578056 and 30572309), the Science Research Foundation of Ministry of Health & United Fujian Provincial
Health and Education Project for Tackling the Key Research of China (Grant No. WKJ2005-2-004), the Young Scientists and Technicians
Innovation Project of Fujian Province (Grant No. 2007F3026), and the Fund from Fujian Normal University (Grant No. 2008100218) 相似文献
18.
Structures and electronic properties of SimN8-m(0 〈 m 〈 8) clusters: a density functional theory study
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The geometries, electronic structures and related properties of SimN8-m(0 〈 m 〈 8) clusters are studied using density functional theory (DFT) with hybrid functional B3LYP. The calculated results reveal several trends. For any stoichiometric clusters, the lowest energy isomers with an alteration of N and Si atoms are favourable in energy if the numbers of Si and N atoms are large enough to form ... Si N-Si-N... alternative chains. The bond lengths of single Si-N bonds are very close to the corresponding values of the bulk and other SiN clusters. The geometries for N-rich and Si4N4 clusters are planar structures, but three-dimensional structures are favourable in energy for Si-rich clusters. With the increase of m, the isotropic polarizability and average polarizability increase, the total binding energies generally decrease, the HOMO-LUMO gap and vertical ionization potential oscillate with increasing number of valence electrons, and their values with even valence electrons are larger than those with odd valence electrons. The atomic charges, IR and Raman properties are also reported. 相似文献
19.
The relationships between the morphological characteristics and the vulnerability of atherosclerotic plaque were analyzed
theoretically and several suggestions were proposed to evaluate the plaque vulnerability. Validated by animal experiments
and clinical studies, the theoretical results were confirmed.
Supported by the National Natural Science Foundation of China (Grant Nos. 10302016 and 60402023), the National Basic Research
Program of China (973 Program)(Grant No. 2006CB503803), and the National Hi-Tech Research and Development Program of China
(863 Program) (Grant No. 2007AA02Z448) 相似文献
20.
Using the first principle methods based on the plane-wave pseudo-potential theory, band structure, density of states and optical
properties of CrSi2 were studied. The calculation of band structure shows that CrSi2 is an indirect semiconductor whose band gap is 0.353 eV. Density of states is mainly composed of 3d electron of Cr and 3p
electron of Si. Dielectric function, refractive index, reflectivity, and absorption coefficient of CrSi2 are also calculated. The calculation results of optical properties are in agreement with the experiments.
Supported by the National Natural Science Foundation of China (Grant No. 60566001), the Specialized Research Fund for the
Doctoral Program of Higher Education of China (Grant No. 20050657003), the Scientific Research Foundation for the Returned
Overseas Chinese Scholars, Ministry of Education of China (Grant No. (2005)383), the Program for Excellent Young Talents of
Guizhou Province (No. 20050528), the Specialized Nomarch Research Fund for the Excellent Science and Technology and Education
Talent’s Projects of Guizhou Province, the Scientific and Technological Projects for the Returned Overseas Chinese Scholars,
Guizhou Province (Grant No. (2004)03), and the Top Talent’s Scientific Research Project of Organization Department of Guizhou
Province. 相似文献