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991.
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993.
Nanoimprint lithography is an economical and convenient method for manufacturing nanostructures, which has developed very quickly and has been widely used in the nanoindustry. However, during the process of nanoimprinting, mechanical instabilities of soft nanostructures could lead to buckling. In order to study the mechanism of this problem, we analyze the buckling of one vertical elastic column under its own weight. Based on the comparison between two critical heights of different substrates (rigid and elastic), we conclude that the approximation of considering the substrate as rigid is acceptable. Furthermore the interaction between columns with the deformation of a substrate could lead to collective buckling. Our theoretical
calculations show that whether the columns are elastic or rigid makes little difference for the buckling modes. 相似文献
calculations show that whether the columns are elastic or rigid makes little difference for the buckling modes. 相似文献
994.
Structural,Magnetic and Magnetocaloric Properties of La-deficient La0.77-xSrxCa0.2MnO2 Perovskites 下载免费PDF全文
La-deficient La0.77-x Ca0.2SrxMnO3 (0 〈 x 〈 0.1) polycrystalline samples are synthesized using the sol-gel technique. The crystal structures of all the samples are single orthorhombic phase with Pbnm space group. Rietveld analysis of x-ray diffraction patterns shows that the Mn-O-Mn bond angle θUn-O-Mn increases whereas the Mn-O bond length dMn--o decreases monotonically with increasing Sr^2+ content, which results in a rich overlap between Mn 3d and O2p orbitals and leads to a systematic increase of the Curie temperature in this compound. It is found that the magnetic entropy change has a maximum at x = 0.06 in La^3+-deficient La0.77-xCa0.2SrxMnO3. This may result from competition between the super-exchange interactions (Mn 4+-O2--Mn4+) and double-exchange interactions (Mn^3+-O^2- -Mn^4+) originating from the appearance of superfluous Mn^4+ ions by substitution of Sr^2+ for La^3+ in this series. Large magnetic entropy changes of 2.32 and 1.83Jkg^-1K^-1 in the x = 0.06 and x = 0.1 samples at their Tcs of 271 K and 303K upon a low magnetic field (10kOe) make these materials promising candidates at near room temperature. 相似文献
995.
996.
Analytic Solution for Magnetohydrodynamic Stagnation Point Flow towards a Stretching Sheet 下载免费PDF全文
A steady two-dimensional magnetohydrodynamic stagnation point flow towards a stretching sheet with variable surface temperature is investigated. The analytic solution is obtained by homotopy analysis method. The convergence region is computed and the feature of the solution is discussed. 相似文献
997.
998.
应用题与解析几何结合是高考的热点之一,其解题思路是通过建立坐标系,应用有关概念与性质解决问题.我们可以将求解解析几何应用问题的基本步骤概括为: 相似文献
999.
对船载特种设备基准点的空间位置进行测量,得到该基准点的运动轨迹并进行测量误差分析,是某项工程数据处理的重要内容.提出了利用三台船载GPS接收机测量船载特种设备基准点的原理和误差分析方法,介绍了该方法的误差源构成,依据测量原理模型,推导出定位精度的估算公式,并叙述了仿真计算与测量实施. 相似文献
1000.