共查询到20条相似文献,搜索用时 33 毫秒
1.
为了减轻机场跑道除胶工作人员的劳动强度,提高除胶工作效率,文章提出了一种基于机器视觉的胶痕自动查找和识别方法,设计了基于ARM单片机控制的图像无线采集和基于PC机控制的图像接收、图像预处理和图像识别系统。文章通过分析预处理后的数据特点,确定了基于细胞神经网络算法的胶痕识别算法,然后在MATLAB仿真环境下确定了该算法的最优模型和参数,最后在Visual C++ 6.0环境下完成了该算法的程序编译,调试并完成了对胶痕的自动识别过程。理论仿真和程序测试的结果证明了文章提出的方法在胶痕自动识别系统中的可行性,也为机场特种设备的无人化和智能化提供了参考。 相似文献
2.
S. I. Bondarevskii V. F. Masterov F. S. Nasredinov N. P. Seregin P. P. Seregin 《Physics of the Solid State》1998,40(10):1625-1626
The change in the 64Cu electron-capture constant for the compounds Cu2O, YBa2Cu3O7, YBa2Cu3O6, Nd2CuO4, Nd1.8Ce0.2CuO4, La2CuO4, La1.7Sr0.3CuO4, Tl2Ba2CaCu2O8, and Bi2Sr2CaCu2O8 has been measured. It is concluded that the copper in YBa2Cu3O7, Nd2CuO4, La2CuO4, La1.7Sr0.3CuO4, Tl2Ba2CaCu2O8, and Bi2Sr2CaCu2O8 is exclusively divalent, whereas in Cu2O, YBa2Cu3O6, and Nd1.8Ce0.2CuO4 univalent copper is present.
Fiz. Tverd. Tela (St. Petersburg) 39, 1793–1794 (October 1998) 相似文献
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A.L. Vasiliev E.A. Stepantsov Z.G. Ivanov E. Olsson K. Verbist G. Van Tendeloo 《Interface Science》1997,5(4):223-230
The structure of the artificial grain boundaries in Al2O3 bicrystals withY3Al5O12 and Y-stabilizedZrO2 (Y-ZrO2) intermediate layers was studiedwith high resolution electron microscopy, electron diffraction and energydispersive X-ray analysis. TheY3Al5O12 intermediate layer wasfound to be polycrystalline with three different orientation relationshipsbetween the 2O3 and theY3Al5O12. The structure of theY3Al5O12/2O3 interfaces is described.Also2O3 bicrystals with an Y-ZrO2/2O3/Y-ZrO2/2O3/Y-ZrO2intermediate layer, prepared at two different temperatures, werestudied.Recry stallization of the intermediate layers occurred during thesolid phase intergrowth of the 2O3 bicrystalsparts and only an Y-ZrO2 layer was found as intermediatelayer. The misorientation between the consecutive Y-ZrO2grains was less than 1.5°. Misfit dislocations and atomic height stepsdecorate the Y-ZrO2/2O3interface. 相似文献
5.
用高温熔融法合成了Ca和Ce复合填充的单相p型CamCenFexCo4-xSb12化合物,探索了两种原子复合填充对其热电性能的影 响规律.研究结果表明,填充分数相同时,Ca和Ce两种原子复合填充的p型CamCe nFexCo4-xSb12化合物的载流子浓度和电 导率介于Ca或Ce一种原子单独填充的化合物之间,且随两种原子填充分数m+n的增加而降低 ;赛贝克系数随两种原子填充总量,尤其是Ce填充分数m的增加以及温度的上升而增加;在 相同填充分数时,两种原子复合填充的p型CamCenFexC o4-xSb12化合物的晶格热导率较Ca或Ce一种原子单独填充的化合物 的晶格热导率低,当总填充分数m+n为0.3左右,且Ca和Ce的填充量大致相等时,化合物的晶 格热导率最低.p型Ca0.18Ce0.12Fe1.45Co2.55 sub>Sb12.21化合物的最大热电性能指数ZT值在750K时达到1.17.
关键词:
skutterudite化合物
双原子复合填充
合成
热电性能 相似文献
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本文中研究了C-15结构V2Hf1-xNbx,V2Zr1-xNbx和V2Hf0.5Zr0.5-xNbx系列的超导转变温度Tc与Nb合量x的关系,发现V2Zr,V2Hf加Nb后与V2Hf0.5Zr0.5加Nb后性能显著不同。测定了V2Zr,V2Hf和V2Hf0.5Zr0.5的X射线光电子能谱。结果表明,当Hf原子和Zr原子共存于AB2化合物的A位上时,发生了一种增强原子间相互作用的新的电荷转移。这个事实支持由角动量分波表象能带论方法分析电声耦合超导原理的结果对四元V2(HfZrNb)系列的超导行为提出的一种可能解释:4d-5d原子配位可能有助于提高4d导带的杂化程度,从而有利于提高超导Tc。
关键词: 相似文献
8.
C.D. Spencer P.A. Smith R.P. Stillwell 《Journal of Physics and Chemistry of Solids》1978,39(2):103-106
The Mössbauer determined cation distributions of FeV2O4, FeCr2O4, FeMn2O4, Fe3O4, FeCo2O4, CoV2O4, CoCr2O4, CoMn2O4, CoFe2O4 and Co3O4 are compared with the quantitative d-orbital stablization energies of McClure and of Dunitz and Orgel. They are also compared with the qualitative ligand field stabilization energies of Cotton. These theories do not account for observation in the cases of FeMn2O4, FeCo2O4 and CoFe2O4. 相似文献
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Anton Shatskiy Konstantin D. Litasov Igor S. Sharygin Ilya A. Egonin Aleksandr M. Mironov Yuri N. Palyanov 《高压研究》2016,36(1):23-41
In order to constrain the Na2CO3–CaCO3–MgCO3 T–X diagram at 6?GPa in addition to the binary and pseudo-binary systems we conducted experiments along the Na2CO3–Ca0.5Mg0.5CO3 join. At 900–1000°C, melting does not occur and isothermal sections are presented by one-, two- and three-phase regions containing Ca-bearing magnesite, aragonite, Na2CO3 (Na2) and Na2(Ca1–0.9Mg0-0.1)3-4(CO3)4-5 (Na2Ca3-4), Na4(Ca1–0.6Mg0–0.4)(CO3)3 (Na4Ca), Na2(Ca0-0.08Mg1–0.92)(CO3)2 (Na2Mg) phases with intermediate compositions. The minimum melting point locates between 1000°C and 1100°C. This point would resemble that of three eutectics: Mgs–Na2Ca3–Na2Mg, Na2Mg–Na2Ca3–Na4Ca or Na2Mg–Na4Ca–Na2, in the compositional interval of [45Na2CO3·55(Ca0.6Mg0.4)CO3]–[60Na2CO3·40Ca0.6Mg0.4CO3]. The liquidus projection has seven primary solidification phase regions for Mgs, Dol, Arg, Na2Ca3, Na4Ca, Na2 and Na2Mg. The results suggest that extraction of Na and Ca from silicate to carbonate components has to decrease minimum melting temperature of carbonated mantle rocks to 1000–1100°C at 6?GPa and yields Na-rich dolomitic melt with a Na# (Na2O/(Na2O?+?CaO?+?MgO))?≥?28?mol%. 相似文献
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采用高温熔融法制备了xBi2O3-50B2O3-(50-x)BaO玻璃, 测定了样品玻璃的近红外光区的发射谱、荧光寿命以及Raman光谱. 在808 nm波长光的激发下, 50Bi2O3-50B2O3二元玻璃中未观察到近红外发光; 随体系中BaO的加入, 当x为40, 45以及49时, 玻璃样品中观察到了近红外宽带发光现象; BaO含量进一步增加, 当x=10–30时, 近红外发光现象消失; 而当玻璃中Bi浓度很低时, 在0.5Bi2O3-50B2O3-50BaO及1Bi2O3-50B2O3-50BaO玻璃中发现了近红外发光现象, 且存在多个发光峰. 对铋离子近红外发光机理进行了初步的探讨. 相似文献
11.
Fusheng Liu Weiqin Ao Laicai Pan Qibao Wang Jialing Yan Junqin Li 《Phase Transitions》2013,86(6):585-597
The isothermal section of the Lu–Fe–Ga ternary system at 773?K was investigated and constructed based on X-ray powder diffraction analysis. Thirteen binary compounds, Lu2Fe17, Lu6Fe23, LuFe2, LuGa3, LuGa2, Lu3Ga5, LuGa, Lu3Ga2, Lu5Ga3, Fe3Ga, Fe6Ga5, Fe3Ga4, FeGa3, nine ternary solid solutions, T1-LuFe2–1.43Ga0–0.57, T2-LuFe1.34–0.92Ga0.68–1.08, T3-LuFe0.52–0.26Ga1.48–1.74, T5-LuFe2.04–1.72Ga0.96–1.28, T6-Lu6Fe23–21.4Ga0–1.6, T7-Lu2Fe17–14.5Ga0–3.5, T8-Lu2Fe12.9–8.1Ga4.1–8.9, T9-LuFe6.8–5.5Ga5.2–6.5, T10-LuFe5.2–4.5Ga6.8–7.5, and two ternary compounds, T4-LuFe2.35Ga0.65 and T11-Lu2FeGa8 have been confirmed. The structures of the five new ternary compounds or solid solution T2, T3, T4, T5 and T8 are determined by Rietveld refinement method. 相似文献
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K. Bormanis M. N. Palatnikov N. V. Sidorov V. V. Efremov I. N. Efremov V. A. Sandler 《Physics of the Solid State》2012,54(5):960-961
Dielectric properties of perovskite ferroelectric solid solutions Li0.07Na0.93Ta0.1Nb0.9O3 and Li0.07Na0.93Ta0.111Nb0.889O3 are studied over the 290?C700 K range of temperature within the frequency range of 25?C106 Hz. A decrease of the Curie temperature (??75 K) compared with Li0.07Na0.93Ta0.1Nb0.9O3 synthesized from mechanical mixture of pentoxides Ta2O5 and Nb2O5 is observed in Li0.07Na0.93Ta0.111Nb0.889O3 synthesized from co-precipitated pentoxide Ta2y Nb2(1 ? y)O5. 相似文献
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The effect of Fe on the phase and magnetocaloric property of LaFe11.6*xSi1.4B0.1 alloys with x = 1.0–1.4 have been studied. The results show that the excess of Fe will make the α-Fe phases increase, but the easy corrosion LaFeSi phase reduces in LaFe11.6*xSi1.4B0.1 alloys. All LaFe11.6*xSi1.4B0.1 alloys keep the first-order magnetic phase transition. The saturation magnetizations of LaFe11.6*xSi1.4B0.1 alloys with x > 1 are much higher than LaFe11.6Si1.4B0.1 alloy under 2T magnetic field. This results in the maximum isothermal magnetic entropy changes, and the relative cooling power of LaFe11.6*xSi1.4B0.1 alloys is bigger than for LaFe11.6Si1.4B0.1 alloys. 相似文献
14.
Mössbauer spectroscopy studies of151 Eu in EuBa2Cu3O7, EuBa2Cu3O6, EuBa2Cu3O6S, EuBaKCu3O7, EuBa2Cu2.5Fe0.5O7, Eu0.5Pr0.5Ba2Cu3O7, Eu1.25Ba1.75Cu3O7 and EuCaBaCu3O7 at several temperatures have been performed. The major conclusions are; All substitutions affect the Eu quadrupole interaction (10–20%). Substitution of 0 by S increases the Eu quadrupole interaction by 15% and increases η from 0.3 to 0.8 which proves that S substitutes oxygen in the immediate neighbourhood of the rare earth ions. In EuCaBaCu3O7 the quadrupole interaction is larger by 80% than in EuBa2Cu3O7, proving that in this structure Eu occupies predominantly the Ba sites. 相似文献
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In this article, the isomerisation mechanisms of HN(NO2)2 to O2NNN(O)OH without and with catalyst X (X = H2O, (H2O)2, (H2O)3, HCOOH, H2SO4, CH3CH2COOH and HN(NO2)2) have been investigated theoretically at the CBS-QB3 level of theory. Our results show that the catalyst X (X = H2O, (H2O)2, (H2O)3, HCOOH, H2SO4 and CH3CH2COOH) shows different positive catalytic effects on reducing the apparent activation energy of the isomerisation reaction processes. Such different catalytic effects are mainly related to the number of hydrogen bonds and the size of the ring structure in X (X = H2O, (H2O)2 and (H2O)3)-assisted transition states, as well as different values of pKa for H2SO4, HCOOH and CH3CH2COOH. Very interesting is also the fact that H2SO4-assisted reaction is the most favourable for the hydrogen transfer from HN(NO2)2 to O2NNN(O)OH, due to the smallest pKa (?3.0) value of H2SO4 than H2O, HCOOH, H2SO4 and CH3CH2COOH, and also because of the largest ∠X???H???Y (the angle between the hydrogen bond donor and acceptor) involved in H2SO4-assisted transition state. Compared to the self-catalysis of the isomerisation mechanisms of HN(NO2)2 to O2NNN(O)OH, the apparent activation energy of H2SO4-assisted channel also reduces by 9.6 kcal?mol?1, indicating that H2SO4 can affect the isomerisation of HN(NO2)2 to O2NNN(O)OH, most obvious among all the catalysts H2O, (H2O)2, (H2O)3, HCOOH, H2SO4, CH3CH2COOH and HN(NO2)2. 相似文献
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This work is devoted to the study of and Rb2UO2F4.H2O and Cs2UO2F4. H2O IR-spectra with the aim of obtaining a set of vibration frequencies characterising M2U02F4.H2O complexe elucidating the role and nature of water bonds in the structures of the above-mentioned compounds; and receiving preliminary information on the structure of M2UO2F4.H2O. The investigated compounds were synthesized in accord with our previous paper1. M2UO2D2O and M2UO2F4.HDO were obtained by recrystallizing M2UO2F4.H2O from D2O and HDO respectively 相似文献
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Jiangang Li Xiangming He Maosong Fan Rusong Zhao Changyin Jiang Chunrong Wan 《Ionics》2006,12(1):77-80
Spherical LiNi1/3Co1/3Mn1/3O2 was successfully prepared by controlled crystallization. The preparation started with the spherical coprecipitate of Ni1/3Co1/3Mn1/3CO3 from NiSO4, CoSO4, MnSO4, NH4HCO3, and NH3·H2O, followed by pyrolysis of Ni1/3Co1/3Mn1/3CO3 at 600°C for 3 h. The X-ray diffraction analysis showed that the homogeneous cubic (Ni1/3Co1/3Mn1/3)3O4 was obtained after the pyrolysis. Spherical LiNi1/3Co1/3Mn1/3O2 was obtained by sintering of the mixture of as-obtained (Ni1/3Co1/3Mn1/3)3O4 and LiOH·H2O at 900°C for 6 h in air. As-prepared spherical LiNi1/3Co1/3Mn1/3O2 presented initial discharge capacity of 162.9 mA h g−1 and capacity retention of 98% at 50th cycle. 相似文献
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Yu. E. Kalinin M. A. Kashirin V. A. Makagonov S. Yu. Pankov A. V. Sitnikov 《Physics of the Solid State》2017,59(1):21-27
This work considers the effect of vacuum annealing on the thermoelectric properties of Sb0.9Bi1.1Te2.9Se0.1 thin film and Sb0.9Bi1.1Te2.9Se0.1–C composites with various carbon contents produced by ion-beam deposition in an argon atmosphere. The electrical resistivity and the thermopower of Sb0.9Bi1.1Te2.9Se0.1–C nanocomposites are found to be dependent on not only the carbon concentration but also the type and the concentration of intrinsic point defects of the Sb0.9Bi1.1Te2.9Se0.1 solid solution, which determine the type of conductivity of Sb0.9Bi1.1Te2.9Se0.1 granules. The power factors are estimated for films of Sb0.9Bi1.1Te2.9Se0.1 solid solution and films of Sb0.9Bi1.1Te2.9Se0.1–C composites and found to have values comparable with the values for nanostructured materials on the basis of (Bi,Sb)2(Te,Se)3 solid solutions. 相似文献
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Photocatalytic activity of Nb2O5/SrNb2O6 heterojunction on the degradation of methyl orange 总被引:1,自引:0,他引:1
Jingcheng Xing Zhichao Shan Jianjiang Bian Wendeng Wang 《Journal of Physics and Chemistry of Solids》2008,69(1):23-28
The pure SrNb2O6 powders were prepared at 1400 °C by a conventional solid-state method and characterized by X-ray powder diffraction and UV-vis diffuse reflection spectrum. The powders of Nb2O5 and SrNb2O6 were ball-milled together and annealed to form the Nb2O5/SrNb2O6 composite. Photocatalytic activities of the composites were investigated on the degradation of methyl orange. The results show that the proportion of Nb2O5 to SrNb2O6 and the annealing temperature greatly influence the photocatalytic activities of the composites. The best photocatalytic activity occurs when the weight proportion of Nb2O5 to SrNb2O6 is 30% and the annealing temperature is 600 °C. The tremendously enhanced photocatalytic activity of the Nb2O5/SrNb2O6 composite compared to Nb2O5 or SrNb2O6 is ascribed to the heterojunction effect taking place at the interface between particles of Nb2O5 and SrNb2O6. The powders also show a higher photocatalytic activity than commercial anatase TiO2. 相似文献
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本文用差热分析和X射线衍射等方法研究了BaO-Na2O-B2O3三元系的两个截面:BaB2O4-Na2B2O4和BaB2O4-Na2O赝二元系的相平衡关系。BaB2O4-Na2B2O4属共晶体系,其共晶温度为826±3℃。在BaB2O4-Na2O体系中发现一个新化合物BaB2O4·Na2O,该化合物在846±3℃同成分熔化。BaB2O4·Na2O对BaB2O4和Na2O均为共晶体系,其共晶温度分别为755±3℃和573±3℃。并根据所得的结果,分别以15mol%Na2O和13mol%Na2B2O4为助熔剂,用提拉法培养出2×4×6mm3和2×4×8mm3的低温相BaB2O4单晶体。
关键词: 相似文献