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Synthesis and Nonlinear Optical Property of a Polyphosphazene with High Glass Transition Temperature
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作者 ZhenLI JinGuiQIN +1 位作者 zhouyang ChengYE 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第4期489-491,共3页
A new polyphosphazene containing binaphtholyl and indole azo chromophores as side chains with high glass transition temperature ( Tg ) was synthesized by a post-functional method. The polymer was well characterized. I... A new polyphosphazene containing binaphtholyl and indole azo chromophores as side chains with high glass transition temperature ( Tg ) was synthesized by a post-functional method. The polymer was well characterized. Its Tg was tested to be 168℃, and the poled film of P2 reveals a resonant d33 value of 20 pm/V by second harmonic generation ( SHG ) measurements. 展开更多
关键词 POLYPHOSPHAZENE SYNTHESIS SHG.
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Immunology of Kaschin-Beck Disease:Studies on lymphocyte subsets, humoral immunity and their relationship with selenium
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作者 WANGZhi-lun ZHAIJun-min +4 位作者 GUORu-ning CHENJing-hong CHENYan zhouyang JeanVanderpas 《中国地方病防治》 2003年第6期335-338,共4页
Objective To study the humoral immunity status and distribution pattern of lymphocyte subgroups of peripheral blood mononuclear cell (PBMC) in patients with Kaschin-Beck Disease (KBD), and their relationship with eryt... Objective To study the humoral immunity status and distribution pattern of lymphocyte subgroups of peripheral blood mononuclear cell (PBMC) in patients with Kaschin-Beck Disease (KBD), and their relationship with erythrocyte selenium.Methods 23 X-ray diagnosed patients, 22 age- and sex- matched healthy children in KBD affected area (KAA), And 25 in KBD non-affected area (KNAA) were randomly selected. Immunohistochemistry with monoclonal antibodies anti-CD4, anti-CD8, anti-CD20 was conducted to analyze the lymphocyte subsets. Serum IgM, IgA, IgG, Complement C3 and C4 were assayed using rate nephelometry (Array 360 System, USA). The contents of erythrocyte selenium was determined by 2,3-diaminonaphthalene fluorescence assay. Results CD4+ and CD8+ cells percentage in PBMCs and serum IgA were significantly lower in KAA than those in KNAA(P<0.05). CD20+ percentage in KAA displayed a decreasing trend compared to KNAA, although not statistically significantly. No statistical differences were found in CD4/CD8 ratio, serum IgG, IgM, C3 and C4 levels. Erythrocyte selenium level in KAA still showed a pronounced decrease compared to that in KNAA. Correlation analysis showed that erythrocyte selenium contents had a strong association with the CD4 cell percentage (r=0.625,P<0.05), and also a close relationship with serum IgA (r=0.462,P<0.05). In addition, we detected a moderate correlation between the serum IgA and CD4+ percentage (r=0.130, P>0.05).Conclusion Taken together, our results suggested that children in KAA had a comparably low cellular immunity level manifested by the marked depression of CD4 and CD8 cells percentage, and their humoral immunity status was also in a state of moderate immune suppression. Of this immune disorder in KBD patients, selenium deficiency probably played a critical role via affecting the distribution pattern of peripheral blood lymphocyte. Selenium-deficiency and immune impairment maybe both have something to do with the cause-effect chain of KBD. 展开更多
关键词 人类免疫系统 免疫学研究 相关因素 克山病
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高强度弹簧钢60Si2CrVAT拉伸试样异常断裂原因分析 被引量:1
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作者 杨娥 陈君 +3 位作者 张军 周杨 杨智 李波 《物理测试》 CAS 2018年第4期34-37,共4页
某公司生产的高强度弹簧钢60Si2Cr VAT圆棒材,出厂之前检测力学性能时发现部分试样抗拉强度及屈服强度满足标准要求,但断面收缩率及断后伸长率指标均明显低于标准要求。利用体视显微镜及扫描电子显微镜(SEM)对力学性能异常试样断裂原... 某公司生产的高强度弹簧钢60Si2Cr VAT圆棒材,出厂之前检测力学性能时发现部分试样抗拉强度及屈服强度满足标准要求,但断面收缩率及断后伸长率指标均明显低于标准要求。利用体视显微镜及扫描电子显微镜(SEM)对力学性能异常试样断裂原因进行了分析。结果表明,性能不合格试样属于异常断裂,试样制备过程中表面产生加工硬化、甚至出现微裂纹是引起拉伸试样异常断裂的主要原因。改善样坯热处理后的加工方式可消除此类异常断裂现象。 展开更多
关键词 高强度弹簧钢 异常断裂 加工硬化
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Nonlinear Optical Properties of Porphyrin Derivatives with Electron-donating or Electron-withdrawing Substituents
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作者 Pengxia Liang Yongsheng Mi +5 位作者 Jinshuai Duan zhouyang Dong Wang Hui Cao Wanli He Huai Yang 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2016年第4期381-386,共6页
To investigate photoelectric properties of meso-extended porphyrin derivatives with electron-donating or elec- tron-withdrawing substituents, a series of functionalized porphyrin materials have been designed and synth... To investigate photoelectric properties of meso-extended porphyrin derivatives with electron-donating or elec- tron-withdrawing substituents, a series of functionalized porphyrin materials have been designed and synthesized by Suzuki coupling reaction. The meso-extended structures were fully characterized by IH NMR, IR spectroscopy and mass spectrometry. The photophysical properties of porphyrin derivatives were carefully examined by UV-Visible and fluorescence spectra, and the solvatochromic effect was observed and discussed. In particular, Z-scan technique was employed to characterize the third-order nonlinear optical (NLO) properties of the products such as nonlinear absorption and refraction, the third-order nonlinear refractive indexes (x(3)-value) of these porphyrin derivatives achieved 3.9 × 10-12 esu. In addition, the compounds could be self-assembled into highly organized morphologies through phase-exchange method. All the results indicated that the discotic materials have the potential for optoelec- tronic applications. 展开更多
关键词 nonlinear optical porphyrin derivatives SELF-ASSEMBLY photophysical properties
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