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951.
基于神经网络学习控制的液压转台偏载干扰的抑制 总被引:2,自引:0,他引:2
飞行仿真转台是将飞行器置于一定的实际飞行环境中,研究其传感器,控制系统及执行机构等硬件设备的动态性能和定位精度时所用的种混合仿真设备。哈尔滨工业大学研制的HIT-1型三轴飞行仿真转台中框由于存在设计上不可避免的偏载负载力矩,影响了其响应速度和动静态精度的进一步提高。本文将学习控制和神经网络方法结合起来,既避免了前者对重复性的要求,又避免了后者对快速系统实时控制的困难,将其应用于对液压转台中框偏载干扰的抑制,取得了良好的仿真结果 相似文献
952.
本文利用一个中尺度三维数值模式,对下垫面气旋发展过程中的影响了进行数值模拟,初步研究了区域性下垫面特征的变化对梅雨锋气旋和暴雨的影响,其结果表明,沙漠引起的温,湿,风的变化导致一个发展成熟的江淮气旋在午后进入沙漠试验区后,气旋的移速减慢,强度增大,在试验区边界附近暴雨增强,而试验区中心附近则降水减小。 相似文献
953.
P. J. Zhai Y. X. Xing Y. Zhang S. L. Feng Y. X. Kang X. W. TangY. G. Wang W. J. Zhao S. Yan 《Radiation measurements》1997,28(1-6):97-100
The topography and size of damage on the surface of HOPG (Highly Oriented Pyrolitic Graphite) bombarded by high fluence (1×1016 ions/cm2) of H+ ions were observed and studied. In this work, 457 STM images of each one with 9×9 nm2 area were obtained. From 163 of these pictures visible damage was found. In these 163 STM images the diameter of most damage is from 0.2 to 0.8 nm. In this study the number density of visible damage is much less than the ion fluence. The probability of damage is only about 1.8×10−4. The possible mechanism of damage formation is also analyzed and discussed. 相似文献
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Pengfei Liu Maolin Zhai Jiuqiang Li Jing Peng Jilan Wu 《Radiation Physics and Chemistry》2002,63(3-6):525-528
Sodium carboxymethyl cellulose (CMC) is a kind of degraded polymer under γ-irradiation. However, in this work, it has been found that CMC crosslinks partially to form hydrogel by radiation technique at more than 20% CMC aqueous solution. The gel fraction increases with the dose. The crosslinking reaction of CMC is promoted in the presence of N2 or N2O due to the increase of free radicals on CMC backbone, but gel fraction of CMC hydrogel is not high (<40%). Some important values related to this kind of new CMC hydrogel synthesized under different conditions, such as radiation yield of crosslinking G(x), gelation dose Rg, number average molecular weight of network Mc were calculated according to the Charlesby–Pinner equation. The results indicated that although crosslinked CMC hydrogel could be prepared by radiation method, the rate of radiation degradation of CMC was faster than that of radiation crosslinking due to the character of CMC itself. Swelling dynamics of CMC hydrogel and its swelling behavior at different conditions, such as acidic, basic, inorganic salt as well as temperature were also investigated. Strong acidity, strong basicity, small amount of inorganic salts and lower temperature can reduce swelling ratio. 相似文献
959.
A HREELS study of the adsorption of formic acid on slightly oxidized Nb(110) surface 总被引:1,自引:0,他引:1
An investigation has been made on the adsorption and decomposition of formic acid on slightly oxidized Nb(110) surface (0/Nb atom ratio = 0.2) using high resolution electron energy loss spectroscopy (HREELS),and a corresponding surface reaction mode is given.At 140 K,formic acid of low exposure on such an Nb(110) surface decomposed to formate,which bonded on Nb in monodentate configuration,simultaneously some formate decomposed to CO,which adsorbed on the surface.Formic acid multilayers formed when the exposure was high.While the temperature was increased to above 190 K,multilayer formic acid desorbed,and the surface was covered with mon-odentate-bonded formate and CO.In the temperature range of 250-300 K,chemisorbed formate changed from monodentate configuration into bridging configuration and CO molecules disappeared.The decomposition of formate at higher temperatures led to the oxidation of Nb.The formate formed in the high exposure case was so stable that it did not decompose even the temperature wa 相似文献
960.
High-speed counter-current chromatography (HSCCC) was repeatedly used for isolation and purification of rhein from Rheum officinale Baill (Dahuang) with a two-phase solvent system composed of n-hexane-ethyl acetate-methanol-water (3:7:5:5, v/v), which had been selected by analytical (HSCCC). Using two preparative units of the HSCCC centrifuge, about a 500 mg amount of the crude extract was separated, yielding 6.7 mg of rhein at a high purity of over 97%. 相似文献