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利用氯化锌水溶液改善纸张强度的研究

造纸科学与技术 2017年第4期36卷 21-25页

作者：袁郑胡志军侯昊林倩倩殷路霞马亨通翟睿浙江科技学院浙江杭州310023

利用氯化锌水溶液在中、高纤维浓度的条件下处理漂白竹纤维化学浆成纸,以求制备高强度纸张,同时利用红外光谱仪、X-射线衍射分析仪和扫描电子显微镜表征处理前后纸张纤维微观性能的变化情况。结果表明,氯化锌质量分数65%、处理温度65℃... 详细信息

利用氯化锌水溶液在中、高纤维浓度的条件下处理漂白竹纤维化学浆成纸,以求制备高强度纸张,同时利用红外光谱仪、X-射线衍射分析仪和扫描电子显微镜表征处理前后纸张纤维微观性能的变化情况。结果表明,氯化锌质量分数65%、处理温度65℃、处理时间8min、洗涤时间10min的处理条件可满足上述要求。与原纸相比,经塑化后的纸张干抗张指数提高55%,干耐破强度指数提高132%,湿抗张强度指数提高190%,湿耐破强度指数提高456%,处理后成纸表面形态变化明显,其它微观性能无明显变化。

关键词：氯化锌水溶液漂白竹纤维胶化作用纸张强度

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少见畸形牙5例

口腔医学 1982年第4期 198-198页

作者：朱如荣张强李振汉俞伯忍中国人民解放军60医院浙江省新昌县城关镇卫生院南京医学院附属口腔门诊部口腔颌面外科江苏省丹阳县人民医院口腔科

例1:李×,男,30岁。因(?)(牙合)面大洞,死髓,(?)垂直低位阻生行拔除术,手术中见(?)稳固,经反复挺拔,最后(?)一并拔出。离体牙(附图1):(?)面广泛龋损,(?)为五尖形,远中舌尖于舌侧(牙合)面,有付沟.(?)远中根下1/2与(?)近中舌根上1/2牙根... 详细信息

例1:李×,男,30岁。因(?)(牙合)面大洞,死髓,(?)垂直低位阻生行拔除术,手术中见(?)稳固,经反复挺拔,最后(?)一并拔出。离体牙(附图1):(?)面广泛龋损,(?)为五尖形,远中舌尖于舌侧(牙合)面,有付沟.(?)远中根下1/2与(?)近中舌根上1/2牙根相互融合,(?)为3根(舌侧2根,颊侧1根),报分叉角度大,形类似上颔磨牙。(?)为4根,舌侧3根融合与一颊根分叉。例2:袁×,女,46岁。因牙周病,多数牙已缺

关键词：根分叉附图根管牙根

Effect of f–c hybridization on theγ→αphase transition of cerium studied by lanthanum doping

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Chinese Physics B 2022年第8期31卷 165-172页

作者： Yong-Huan Wang Yun Zhang Yu Liu Xiao Tan Ce Ma Yue-Chao Wang Qiang Zhang Deng-Peng Yuan Dan Jian Jian Wu Chao Lai Xi-Yang Wang Xue-Bing Luo Qiu-Yun Chen Wei Feng Qin Liu Qun-Qing Hao Yi Liu Shi-Yong Tan Xie-Gang Zhu Hai-Feng Song Xin-Chun Lai Science and Technology on Surface Physics and Chemistry Laboratory Jiangyou 621908China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China

The hybridization between the localized 4f level(f) with conduction(c) electrons in γ-Ce upon cooling has been previously revealed in single crystalline thin films experimentally and theoretically, whereas its influence on the γ → α phase transition was not explicitly verified, due to the fact that the phase transition happened in the bulk-layer, leaving the surface in the γ phase. Here in our work, we circumvent this issue by investigating the effect of alloying addition of La on Ce, by means of crystal structure, electronic transport and angle resolved photoemission spectroscopy measurements, together with a phenomenological periodic Anderson model and a modified Anderson impurity model. Our current researches indicate that the weakening of f–c hybridization is the major factor in the suppression of γ → α phase transition by La doping. The consistency of our results with the effects of other rare earth and actinide alloying additions on the γ → α phase transition of Ce is also discussed. Our work demonstrates the importance of the interaction between f and c electrons in understanding the unconventional phase transition in Ce, which is intuitive for further researches on other rare earth and actinide metals and alloys with similar phase transition behaviors.

关键词： structural phase transition molecular beam epitaxy ARPES f-electron system

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城西地产困局应从哪里突破？ C03