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91.
一类分数阶微分方程正解的存在性 总被引:1,自引:0,他引:1
研究了非线性项可变号的分数阶微分方程两点边值问题其中f:[0,1]×[0,∞)→(→∞,∞)是连续的,λ>0,q(t)>02通过构造适当算子,继而运用锥上的不动点定理,得到了该问题至少一个正解的存在性. 相似文献
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T. V. Mikhailichenko L. A. Kalinina Yu. N. Ushakova G. I. Shirokova T. V. Tokareva 《Russian Journal of Electrochemistry》2011,47(5):556-562
The possibility of synthesizing complex sulfide phases in the BaSm2S4-Tm2S3 system has been studied. Tm2S3 solid solutions were obtained with BaSm2S4 (CaFe2O4 structural type). The samples were identified by X-ray diffraction analysis and electron microscopy. The range of the solid
solutions was determined. The total conductance was studied, and the conductance activation energy was calculated for samples
with different dopant contents. The electrolytic properties of basic ternary sulfide and complex sulfide phases in the BaSm2S4-x mol % Tm2S3 system were investigated. A possible mechanism of defect formation was proposed. 相似文献
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Yihe Zhang Fengzhu Lv Tao Wu Li Yu Rui Zhang Bo Shen Xianghai Meng Zhengfang Ye Paul K. Chu 《Journal of Sol-Gel Science and Technology》2011,59(2):387-391
Four different sols, pure TiO2, F doped TiO2, Fe doped TiO2, and F–Fe co-doped TiO2 sols, were prepared by peroxidation at low temperature. The crystal structure, morphology, light adsorption, and photocatalytic
properties of the pure and doped TiO2 were examined by X-ray diffraction, transmission electron microscopy, and ultraviolet–visible spectrophotometry. The relationship
between the average size, crystal type, range of visible light absorption, and photocatalytic activity and content and type
of doped ions were investigated. The results showed that the average size of the F–Fe co-doped TiO2 composed of both the anatase and rutile phases was the same as that of pure TiO2. Furthermore, the visible light photocatalytic activity of the F–Fe co-doped TiO2 was significantly improved over pure TiO2, F-doped TiO2, and Fe-doped TiO2 due to the large red shift in the light adsorption edge. 相似文献
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