维普中文期刊产品整合服务
37篇 您的检索式:作者名="Hellmut"
    题名 作者 年代 出处 被引量
1Y_2O_3掺杂对SiO_2-Al_2O_3-MgO系玻璃结构与机械性能的影响显示文摘采用传统熔体冷却法制备Y2O3掺杂质量分数为0~1.8%的SiO2-Al2O3-MgO系玻璃,探讨了Y2O3含量对玻璃弯曲强度、压缩强度、压缩模量和结构稳定性的影响规律。结果表明:当Y203掺杂量小于1.2%时,玻璃的光学带隙随着Y2O3含量的增加而减小、玻璃结构更加稳定,其弯曲强度、压缩强度以及压缩模量均随着Y2O3含量的增加而上升;当Y2O3含量超过1.2%后,该玻璃体系的结构稳定性和机械性能均随着Y2O3含量的增加而出现下降;当Y2O3的含量为1.2%时,玻璃的光学带隙最小,为3.11eV,机械性能达到最优,其弯曲强、压缩度强度和压缩模量分别107.48MPa、221.24MPa和117.87GPa。适量Y203的掺杂,减少了玻璃网络结构中非桥氧数量,使孤立的岛状网络单元重新聚合,增强了Si—O—Si反对称伸缩振动,增加了玻璃结构的稳定性,从而显著提高了玻璃的机械性能;但过量的Y2O3迫使玻璃结构中的桥氧键断裂,生成非桥氧,显著降低了玻璃的结构稳定性和机械性能。高任 王焕平 朱钦恭 李兵朋 HELLMUT Eckert ZHANG Xianghua 徐时清 2016硅酸盐学报2016,44,10:3
2TiO_2掺杂对SiO_2-Al_2O_3-MgO系玻璃结构和力学性能的影响显示文摘采用传统熔体冷却法制备TiO_2掺杂量为0~1.8wt%的TiO_2/SiO_2-Al_2O_3-MgO系玻璃,探讨了不同TiO_2质量分数对玻璃体积密度、弯曲强度、压缩强度、压缩模量和结构稳定性的影响规律。结果发现:当TiO_2含量小于1.5wt%时,TiO_2/SiO_2-Al_2O_3-MgO系玻璃的光学带隙随着TiO_2含量的增加而减小、玻璃结构更加稳定,其体积密度、弯曲强度、压缩强度以及压缩模量均随着TiO_2含量的增加而上升;当TiO_2含量超过1.5wt%后,该玻璃体系的结构稳定性和力学性能均随着TiO_2含量增加而下降;当TiO_2的质量分数为1.5wt%时,玻璃的光学带隙达到最小值为3.75eV,各项力学性能达到最优,其弯曲强度为110.36 MPa、压缩强度为240.18 MPa、压缩模量为115.03GPa。适量TiO_2的掺杂,减少了玻璃网络结构中非桥氧的数量,使孤立的岛状网络单元重新聚合,从而显著提高了玻璃的结构稳定性和力学性能;但过量的TiO_2迫使TiO_2/SiO_2-Al_2O_3-MgO系玻璃结构中的桥氧键断裂生成非桥氧,由此显著降低了其结构稳定性和力学性能。高任 王焕平 朱钦恭 肖珍 HELLMUT Eckert ZHANG Xianghua 徐时清 2017复合材料学报2017,34,3:3
3Thermal and luminescent properties of 2 μm emission in thulium-sensitized holmium-doped silicate-germanate glass显示文摘In this paper, we present the luminescent properties of Tm^(3+)∕Ho^(3+)co-doped new glass. A series of silicategermanate glass was prepared by the conventional melt-quenching method. In the Tm^(3+)∕Ho^(3+)co-doped silicategermanate glass, a strong emission of 2 μm originating from the Ho^(3+):~5I_7→~5I_8transition can be observed under conventional 808 nm pumping. The characteristic temperatures, structure, and absorption spectra have been measured. The radiative properties of Ho^(3+)in the prepared glass were calculated. The emission cross section of Ho^(3+)ions transition can reach 4.78 × 10^(-21)cm^2 around 2 μm, and the FWHM is as high as 153 nm. The energy transfer efficiency between Ho^(3+)and Tm^(3+)has a large value(52%), which indicates the Tm^(3+)∕Ho^(3+)co-doped silicategermanate glass is a suitable candidate for the 2 μm laser. Moreover, the energy transfer mechanism between Tm^(3+)and Ho^(3+)ions was investigated.Rong Chen Ying Tian Bingpeng Li Xufeng Jing Junjie Zhang Shiqing Xu Hellmut Eckert Xianghua Zhang 2016Photonics Research2016,4,6:2
4市民社会在德国--讨论分支以及政治社会现实显示文摘本文第一部分简要介绍了各种使'市民社会'这一主题和设想进入德国学术和政治讨论并发挥作用的讨论分支。不同讨论分支的共同之处在于,'市民社会'在社会和政治对比中、并且部分地在与国家的对立中被理解为'官方的'政治、行政管理和统治体系。在这方面,'市民社会'具有显著的社会-参与和政治-解放特征。本文第二部分介绍了德国'市民社会'和所谓'第三部门'的社会-政治实践。在引用实证调研成果的基础上,特别确定了三组市民社会活动:其一是健康卫生和社会服务,其二是文化休闲,其三是环境、消费者保护和市民参与。本文的最后批评性地指出,市民社会活动有被国家'工具化'、遭其利用而被转嫁公共事务和开支的危险。赫尔穆特·沃尔曼(Hellmut Wollmann) 俞宙明(译) 伍慧萍(校) 2008德国研究2008,23,3:2
5Agiogenic tumor therapy : Will it work? 显示文摘Hellmut G A 1998Tips-June1998,19,:1
6Phase'transitions in clusters显示文摘Martin S Hellmut H 2002C R Physuqye2002,3,:1
7显示文摘Hellmut Ahne Rainer Leuschner Roland Rubner 1993Poly mers for Advanced Technologies1993,4,:1
8Functional integral approach to the magnetic impurity problem: The superiority of the two-variable method显示文摘Daniel J. Amit Hellmut Keiter 1973Journal of Low Temperature Physics (-)1973,,5:1
9Delayed-choice Experiments in Quantum Interference显示文摘HELLMUT T WALTHER H 1987Phys Rev A1987,35,:1
10Diabetes mellitus in care facilities-what could be improved?显示文摘Ortrud Hamann Hellmut Küster 2013Diabetes Aktuell2013,11,5:1
11Blutgerinnungsstudien mit der Thrombelastographie, einem neuen Untersuchungsverfahren显示文摘Hellmut Hartert 0,,:1
12Standard graft-versus-host disease prophylaxis with or without anti-T-cell globulin in haematopoietic cell transplantation from matched unrelated donors: a randomised, open-label, multicentre phase 3 trial显示文摘Jürgen Finke Wolfgang A Bethge Claudia Schmoor Hellmut D Ottinger Matthias Stelljes Axel R Zander Liisa Volin Tapani Ruutu Dominik A Heim Rainer Schwerdtfeger Karin Kolbe Jiri Mayer Johan A Maertens Werner Linkesch Ernst Holler Vladimir Koza Martin Bornh? 2009Lancet Oncology2009,,9:1
13A giogenic tumor therapy:Will it work? 显示文摘Hellmut GA 1998Tip s21998,19,:1
14Molecular-dynamics simulation of thin-film by energetic cluster impact显示文摘HELLMUT HABERLAND 1995Physical Review B1995,51,11:1
15Switching of postmenopausal women with endocrine-responsive early breast cancer to anastrozole after 2 years’ adjuvant tamoxifen: combined results of ABCSG trial 8 and ARNO 95 trial显示文摘Raimund Jakesz Walter Jonat Michael Gnant Martina Mittlboeck Richard Greil Christoph Tausch Joern Hilfrich Werner Kwasny Christian Menzel Hellmut Samonigg Michael Seifert Guenther Gademann Manfred Kaufmann 2005The Lancet2005,,9484:1
16Comparing two logics of interlocal cooper ation:the cases of france and germany显示文摘HELLMUT W 0,,02:1
17Characterization techniques 显示文摘Hellmut Eckert Manfred Rühle 2001Current Opinion in SolidState and Materials Science2001,5,23:1
18Manganese-enhanced magnetic resonance imaging of mouse brain after systemic administration of MnCl2:dose-dependent and temporal evolution of 71 contrast显示文摘Jung HL Afonso CS Hellmut M 2005Magn Reson Med2005,53,:1
19Transcriptional profiling of human glioblastoma vessels indicates a key role of VEGF‐A and TGFβ2 in vascular abnormalization显示文摘Lothar C Dieterich Sofie Mellberg Elise Langenkamp Lei Zhang Agata Zieba Henriikka Salom?ki Martin Teichert Hua Huang Per‐Henrik Edqvist Theo Kraus Hellmut G Augustin Tommie Olofsson Erik Larsson Ola S?derberg Grietje Molema Fredrik Pontén Patrik Georgii‐ 2012J. Pathol2012,,3:1
20Angiopoietins: a link between angiogenesis and inflammation显示文摘Ulrike Fiedler Hellmut G. Augustin 2006Trends in Immunology2006,,12:1
返回顶部 每页显示:
共2页 首页 上一页 第1页 下一页 末页 /2 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费