排序方式: 共有38条查询结果,搜索用时 15 毫秒
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Xu Yongjian Yu Ling Liang Lizhen Hu Chundong Xie Yahong Xie Yuanlai Jiang Caichao Liu Sheng Wei Jianglong Liu Zhimin Sheng Peng Tao Ling 《Journal of Thermal Analysis and Calorimetry》2020,139(1):527-533
Journal of Thermal Analysis and Calorimetry - According to EAST’s experimental plan, the long-pulse and high-power operation of neutral beam injector is the requirement for EAST. In this... 相似文献
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Jianbo Tan Yuhao Bai Xuechao Zhang Chundong Huang Dongdong Liu Li Zhang 《Macromolecular rapid communications》2016,37(17):1434-1440
Photoinitiated reversible addition‐fragmentation chain transfer (RAFT) dispersion polymerization of 2‐hydroxypropyl methacrylate is conducted in water at low temperature using thermoresponsive copolymers of 2‐(2‐methoxyethoxy) ethyl methacrylate and oligo(ethylene glycol) methacrylate (Mn = 475 g mol−1) as the macro‐RAFT agent. Kinetic studies confirm that quantitative monomer conversion is achieved within 15 min of visible‐light irradiation (405 nm, 0.5 mW cm−2), and good control is maintained during the polymerization. The polymerization can be temporally controlled by a simple “ON/OFF” switch of the light source. Finally, thermoresponsive diblock copolymer nano‐objects with a diverse set of complex morphologies (spheres, worms, and vesicles) are prepared using this particular formulation.
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采用慢正电子湮没光谱研究低能质子辐照下ZnO白漆的光学退化。研究结果表明,随质子辐照注量的增加, 多普勒展宽谱的S参数逐渐减小,W参数逐渐增大。质子辐照下S-W参数拟合曲线的斜率发生改变。S参数的减小可以归结为锌空位含量的减少以及准正电子素的形成。准正电子素{单电离氧空位(捕获一个电子)+正电子}的形成,能够降低正电子湮没的速率,导致S参数减小。S参数的减小证实了质子辐照导致ZnO白漆中单电离氧空位数量的增加。S-W参数拟合曲线斜率的变化可以归结于质子辐照下双电离氧空位向单电离氧空位的转变。 相似文献
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Yurina V. Yu. Neshchimenko V. V. Chundong Li 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2020,14(2):253-259
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques - A comparative analysis of the diffuse reflectance spectra in the range from 200 to 2500 nm is carried out on... 相似文献
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M. M. Mikhailov V. V. Neshchimenko N. V. Dedov Chundong Li Shiyu He 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2011,5(6):1152-1161
The effect of the modification of ZnO powders by ZrO2 and Al2O3 nanoparticles with a concentration of 1–30 wt % is investigated by diffuse reflectance spectra within the wavelength range
0.2 to 2.5 μm before and after 100 keV proton and electron irradiation. It has been established that the introduction of nanoparticles
enhances the optical stability of the pigments under proton irradiation, but reduces it under electron irradiation. Samples
modified by 5 wt % of ZrO2 nanoparticles have the highest stability of optical properties after proton exposure. The degradation of optical properties
under electron irradiation is not high for this concentration of nanoparticles. A decrease in the absorption of pigments modified
with nanoparticles after proton exposure is determined by a decrease in the intensity of bands located in the UV and visible
regions. After electron exposure the absorption bands have a high intensity in the whole spectrum range. 相似文献
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M. M. Mikhailov V. V. Neshchimenko Chundong Li Bang-Jiao Ye 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2012,6(1):6-11
The modifying effect of Al2O3, Al2O3 · CeO2, ZrO2, ZrO2 · Y2O3 nanopowders on the photoluminescence spectra of ZnO powder in the 360–660 nm range is investigated. It is found that the
introduction of nanoparticles causes a decrease in the ultraviolet band intensity and an increase in the visual spectral band
intensity. The change in the intensity of elementary components of the visible range band during modification seems to be
explained by the emergence of oxygen and zinc vacancies (V
O+ and V
Zn−) and interstitial oxygen ions (O
i
−). 相似文献
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M. M. Mikhailov V. V. Neshchimenko Lee Chundong T. A. Utebekov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2017,11(4):827-831
A comparative analysis of the structure, phase composition, morphology, and diffuse reflection spectra in the region of 0.2–2.5 μm is carried out. Their changes arising from the bombardment of microand nanopowders of yttrium oxide with 100-keV protons and 100-keV electrons is examined. It is found that the reflectance of the nanopowders in the near-IR (infrared) region is less than that of the micropowders and, upon electron bombardment, their radiation resistance is slightly larger as compared to the micropowders. 相似文献
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在基于等效源法近场声全息技术的基础上,对稳定重建过程不适定性的正则化技术进行深入研究.为改善正则化效果,综合考虑Tikhonov正则化和截断奇异值法,提出一种新的分部优化正则化技术.该技术兼取了两种方法的优点,比Tikhonov正则化稳定,避免了过滤波等正则化失效的情况;比截断奇异值法精度高,包含了更多的细节信息.通过对简支板的数值仿真,分别和Tikhonov正则化和截断奇异值法进行了比较,说明了本文所提方法稳定性较好和精度较高的优点.最后通过实验研究进一步证明了本文方法的有效性和正确性. 相似文献