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101.
Lithium and sodium intercalation in TiS2 have been studied by transmission electron microscopy using lattice imaging and diffraction contrast techniques. NaxTiS2 samples (0 ≤ x ≤ 0.6) from in propylene carbonate/TiS2 batteries were found to contain a complex variety of phases inhomogeneous on a fine scale. Observations showed variable staging and a 2H phase not previously reported for this system at ambient temperatures. Observations on both NaxTiS2 and chemically prepared LixTiS2 showed highly dislocated structures. A model is proposed whereby dislocations are introduced to accommodate misfit strains caused by nonuniform intercalation and, in the case of NaxTiS2, to initiate phase transformations, leading to potentially irreversible structural changes in cycled material. 相似文献
102.
The electrical resistance changes of thin gold film electrodes of preferential orientation [111] with film thickness and potential have been studied. The applicability of the Fuchs-Sondheimer (FS) relation to the decrease of resistance observed at the first negative polarization and the first few potential sweeps for different thicknesses have shown that this phenomenon is due to a surface process, interpreted as a cleaning of the electrodes. The resistance changes observed during the electrochemical adsorption and desorption of oxygen also obey the FS relation. The analysis of the resistance variation with the charge exchanged during these reactions has allowed us to show that the electrochemical adsorption of oxygen, on these gold films occurs by a two-dimensional island mechanism with formation of different structures of the surface layer. The values of the resistivity change caused by the adsorption of 1% oxygen atoms (with respect to the total number of metal atoms in the films) at low coverage have been compared with those observed in other systems (metal-gas, metal-metal). 相似文献
103.
104.
We construct the supersymmetric economical 3-3-1 model which contains inflationary scenario and avoids the monopole puzzle.
Based on the spontaneous symmetry breaking pattern (with three steps), the F-term inflation is derived. The slow-roll parameters ∈ and η are calculated. By imposing as experimental five-year WMAP data on the spectral index n, we have derived a constraint on the number of e-folding N
Q
to be in the range from 25 to 50. The scenario for large-scale structure formation implied by the model is a mixed scenario
for inflation and cosmic string, and the contribution to the CMBR temperature anisotropy depends on the ratio M
X
/M
Pl. From the COBE data, we have obtained the constraint on the M
X
to be M
X
∈ [1.22 × 1016, 0.98 × 1017] GeV. The upper value M
X
≃ 1017 GeV is a result of the analysis in which the inflationary contribution to the temperature fluctuations measured by the COBE
is 90%. The coupling α varies in the range: 10−7−10−1. This value is not so small, and it is a common characteristics of the supersymmetric unified models with the inflationary
scenario. The spectral index n is a little bit smaller than 0.98. The SUGRA corrections are slightly different from the previous consideration. When ξ ≪ 1 and α lies in the above range, the spectral index gets the value consistent with the experimental five-year WMAP data. Comparing
with string theory, one gets ξ < 10−8. Numerical analysis shows that α ≈ 10−6. To get inflation contribution to the CMBR temperature anisotropy ≈90%, the mass scale M
X
< 3.5 × 1014 GeV. 相似文献
105.
Salmon L Thuéry P Asfari Z Ephritikhine M 《Dalton transactions (Cambridge, England : 2003)》2006,(24):3006-3014
Reactions of UCl4 with 25,27-dimethoxy-5,11,17,23-tetra-tert-butylcalix[4]arene (H2Me2calix) in THF or pyridine at 80 degrees C gave [UCl2(Me2calix)L2] [L = THF (1) or pyridine (2)]. Similar treatment of U(acac)(4) (acac = MeCOCHCOMe) with H2Me2calix in THF or pyridine afforded [U(acac)2(Me2calix)] (3). The bis-calixarene compound [U(Me2calix)(H2calix)] (4) was obtained by reaction of U(OTf)4 or U(OTf)3 with H2Me2calix in pyridine at 110 degrees C. Treatment of UCl4 with H2Me2calix in pyridine at 110 degrees C gave [Mepy][UCl2(Hcalix)(py)2] (5) resulting from demethylation and acid cleavage of the methoxy groups of the calixarene ligand of 2. Adventitious traces of air were responsible for the formation of [Hpy][Mepy]4[{UCl(calix)}3(mu3-O)][UCl6] (6) during the reaction of UCl4 and H2Me2calix, and of [{U(Me2calix)(mu3-O)LiCl(THF)}2] (7) during the reaction of 2 with tBuLi. The X-ray crystal structures of 1.2THF, 2.2py, 3.0.25L (L = THF and py), 4.2py, 5, 6.3py and 7.THF have been determined. 相似文献
106.
Lu YH Lu YW Wu CL Shao Q Chen XL Bimbong RN 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2006,65(3-4):695-701
Salicyladehyde benzoylhydrazone (SBH) has three groups suitable for forming coordination bond with transition metal. The UV-vis absorption spectra of SBH and its Co(II) complexes in various media were studied by using the deconvolution method. It is found that the structure of complex in solution is different from those in solid crystals. The nature of complexes in solution depends on acidity of the phenolic proton of SBH and on the medium. In neutral or slightly acid medium, the SBH is a non-charged bidentate ligand. And the "free" hydroxyl group on the SBH molecule makes it possible to form hydrogen bonds in solution. In basic medium, the SBH is a mono, negatively charged tridentates ligand. 相似文献
107.
Nguyen Thi Thu Huong Nguyen Chinh Cuong Ha Huy Bang Dao Thi Le Thuy 《International Journal of Theoretical Physics》2010,49(7):1457-1464
We study the pair production of scalar quark in a muon collider within the MSSM with CP violation. We show that including the CP phases can strongly affect the cross section of the process: \(\mu^{+}\mu^{-}\rightarrow \tilde{q}_{i}\bar{\tilde{q}}_{j}\). This could have an important impact on the search for squarks and the determination of the MSSM parameters at future colliders. 相似文献
108.
Simon Dagois-Bohy Sandrine Ngo Sylvain Courrech du Pont Stéphane Douady 《Ultrasonics》2010,50(2):127-132
Some desert sand dunes have the peculiar ability to emit a loud sound up to 110 dB, with a well-defined frequency: this phenomenon, known since early travelers (Darwin, Marco Polo, etc.), has been called the song of dunes. But only in late 19th century scientific observations were made, showing three important characteristics of singing dunes: first, not all dunes sing, but all the singing dunes are composed of dry and well-sorted sand; second, this sound occurs spontaneously during avalanches on a slip face; third this is not the only way to produce sound with this sand.More recent field observations have shown that during avalanches, the sound frequency does not depend on the dune size or shape, but on the grain diameter only, and scales as the square root of g/d - with g the gravity and d the diameter of the grains - explaining why all the singing dunes in the same vicinity sing at the same frequency.We have been able to reproduce these singing avalanches in laboratory on a hard plate, which made possible to study them more accurately than on the field. Signals of accelerometers at the flowing surface of the avalanche are compared to signals of microphones placed above, and it evidences a very strong vibration of the flowing layer at the same frequency as on the field, responsible for the emission of sound.Moreover, other characteristics of the booming dunes are reproduced and analyzed, such as a threshold under which no sound is produced, or beats in the sound that appears when the flow is too large. Finally, the size of the coherence zones emitting sound has been measured and discussed. 相似文献
109.
We present a reasonable concept for solutions of non-instantaneous impulsive Cauchy problems with a ψ–Hilfer fractional derivative. Also, we provide a new sufficient condition for the existence, uniqueness, and stability of solutions for the given problem. 相似文献
110.
In this article, we study the existence of infinitelymany solutions for the boundary–value problem , where Ω is a bounded domain with smooth boundary in ? N (N ≥ 2) and Δγ is a subelliptic operator of the form . Our main tools are the local linking and the symmetric mountain pass theorem in critical point theory.
相似文献
$$ - {\Delta _\gamma }u + a\left( x \right)u = f\left( {x,u} \right)in\Omega ,u = 0on\partial \Omega $$
$${\Delta _\gamma }: = \sum\limits_{j = 1}^N {{\partial _{{x_j}}}\left( {\gamma _j^2{\partial _{{x_j}}}} \right)} ,{\partial _{{x_j}}}: = \frac{\partial }{{\partial {x_j}}},\gamma = \left( {{\gamma _1},{\gamma _2}, \cdots ,\gamma N} \right)$$