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for preparing Ti2AlNb rings, thermal mechanical simulation tests of PM Ti2AlNb alloys were conducted and two rectangular PM rings(150 mm in height, 75 mm in thickness,350 mm in external diameter) were rolled.... A sound PM Ti2AlNb rectangular ring blank(height = 150 mm, thickness = 30 mm, external diameter = 750 mm) was successfully rolled in two passes by using the improved heat preservation method......
phase) with the irregular morphology and the ultra-fine acicular laths(dual phase: γ and ε) with the slender and rectangular morphologies. As compared to the slight reduction sample, the much denser......
="ChDivSummary">An orthotropic functionally graded piezoelectric rectangular plate with arbitrarily distributed material properties was studied, which is simply supported and grounded(electrically......
that rectangular well pattern in fracture reservoirs has the best adaptability, while the worst is inverted nine-spot equilateral well pattern. With the increase of drawdown pressure, dead oil region decreases, pressure sweep efficiency and deliverability index increase; meantime, the deliverability index of rectangular well pattern has much more rational increase. Under the same drawdown pressure......
as the reaction containers. The results show that the sole predominant vapor complex is Na2ZrCl6 for the ZrCl4-NaCl system under the experimental conditions. The thermodynamic equilibrium constants and other......
. Firstly, the trapezoidal core waveguide is successfully equivalent to the rectangular one with both restricting the same optical field energy by adopting the perturbation method. Then, the equivalent rectangular core waveguide is decomposed into two slab waveguides by employing the modified effective-index method. The trapezoidal core waveguide scattering theory model is established based......
. Since the conical electrode has the very narrow sized quasi-stable region, few CNTs can be attached. The rectangular electrodes have a wide stable region, so lots of CNTs can be attached. The results indicate that the round electrode which has a proper sized quasi-stable region is more effective for aligning and attaching a single CNT than the conical or rectangular shaped electrodes. Key words......
硫氰酸盐分光光度法测定钛合金中钼的测量不确定度评定张殿凯1,李满芝1,臧慕文1,童坚1(1.北京市北京有色金属研究总院)摘 要:对硫氰酸盐分光光度法测定钛合金中钼含量的不确定度来源进行了辨别,并在此基础上对测定过程中的不确定度分量进行了合理评定.测量不确定度主要来源于试样称量,标准溶液配制,校准曲线拟合,各种玻璃量器的使用及测量重复性.依据不确定度评定的步骤,分析和计算得到了各分量标准不确定度及合成标准不确定度,最后合成标准不确定度乘以95%置信概率下的扩展因子2获得测量结果的扩展不确定度.关键词......