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31.
We investigate waveguiding of ultraslow light pulses in an atomic Bose-Einstein condensate. We show that under the conditions of off-resonant electromagnetically induced transparency, waveguiding with a few ultraslow modes can be realized. The number of modes that can be supported by the condensate can be controlled by means of experimentally accessible parameters. Propagation constants and the mode conditions are determined analytically using a Wentzel-Kramers-Brillouin analysis. Mode profiles are found numerically. 相似文献
32.
Electron beam lithography (EBL) is used to create surfaces with protein patterns, which are characterized by immunofluorescence and atomic force microscopies. Both negative and positive image processes are realized by electron beam irradiation of proteins absorbed on a silicon surface, where image reversal is achieved by selectively binding a second species of protein to the electron beam exposed areas on the first protein layer. Biofunctionality at the cellular level was established by culturing cortical cells on patterned lines of fibronectin adsorbed on a bovine serum albumin background for 7 days in culture. 相似文献
33.
Devrim Çakmak 《Applied mathematics and computation》2010,216(2):368-4871
In this paper, first we will give a short survey of the most basic results on Lyapunov inequality, and next we obtain this-type integral inequalities for certain higher order differential equations. Our results are sharper than some results of Yang (2003) [20]. 相似文献
34.
Sevdiye Atakul Savrık Devrim Balköse Semra Ülkü 《Journal of Thermal Analysis and Calorimetry》2011,104(2):605-612
Lubricating oil additives based on boron compounds are promising materials for lubrication due to their tribological advantages
such as antiwear efficiency, good film strength, and high temperature resistance. This article deals with the preparation
of zinc borate particles that are well dispersed and colloidally stabilized in mineral oil. This method starts with preparing
two inverse emulsions (water-in-oil) with sorbitan monostearate (Span 60) as a surfactant, light neutral oil as a continuous
phase, and the aqueous solutions of borax decahydrate (Na2B4O7·10H2O) and zinc nitrate (Zn(NO3)2·6H2O) as the dispersed phases. The produced particles were zinc borate crystals having both rod-like and spherical morphologies,
and the diameters of spherical particles were changing between 20 and 30 nm. FTIR spectra of the obtained particles showed
the characteristic peaks of trihedral borate (B(3)-O) and tetrahedral borate (B(4)-O) groups as well as the specific peaks
of the sorbitan monostearate. TG showed 30.42% and 22.08% mass loss at 600 °C for the samples prepared by inverse emulsion
and precipitation techniques, respectively. The endothermic peak at 50 °C is observed due to the melting of sorbitan monostearate
and the heat of melting is evaluated as −3.50 J/g. Tribological studies revealed that sorbitan monostearate not only outperformed
as a dispersing agent of inorganic particles, but also it proved to be an anti-wear agent. Zinc borate produced by precipitation
decreased the wear scar diameter from 1.402 to 0.639 mm and the friction coefficient from 0.099 to 0.064. The inverse emulsion
was effective in decreasing wear scar diameter and the friction coefficient by lowering them to 0.596 and 0.089 mm, respectively. 相似文献
35.
In this paper, we sketch some recent developments in the theory of Lyapunov-type inequalities and present some new results relating to a quasilinear system, special cases of which contain some well-known differential equations such as half-linear and linear equations. Our result generalize the Lyapunov-type inequality given in [18]. 相似文献
36.
We describe herein the results of manganese(III) acetate mediated α′-benzylation of various α,β-unsaturated and β-alkoxy-α,β-unsaturated ketones in moderate yields. 相似文献
37.
38.
In this work we have generalized the super KdV equation into a multicomponent super KdV equation. It is shown that the system
is bi-super Hamiltonian. The third super Hamiltonian in the multicomponent super KdV hierarchy is obtained and the corresponding
first and second members of evolution equations are given.
Presented at the 10th International Colloquium on Quantum Groups: “Quantum Groups and Integrable Systems”, Prague, 21–23 June
2001.
This work is supported by Yildiz Technical University Foundation under project No. 21-01-01-02. 相似文献
39.
We study Bose-Einstein condensation in a linear trap with a dimple potential where we model dimple potentials by Dirac δ function. Attractive and repulsive dimple potentials are taken into account. This model allows simple, explicit numerical and analytical investigations of noninteracting gases. Thus, the Schrdinger equation is used instead of the Gross-Pitaevski equation. We calculate the atomic density, the chemical potential, the critical temperature and the condensate fraction. The role of the relative depth of the dimple potential with respect to the linear trap in large condensate formation at enhanced temperatures is clearly revealed. Moreover, we also present a semi-classical method for calculating various quantities such as entropy analytically. Moreover, we compare the results of this paper with the results of a previous paper in which the harmonic trap with a dimple potential in 1D is investigated. 相似文献
40.
In this paper, oscillation criteria for the nonlinear second-order ordinary differential equation