维普中文期刊产品整合服务
356篇 您的检索式:作者名="LEUSCHNER"
    题名 作者 年代 出处 被引量
1银基触头材料电弧侵蚀特性及裂纹形成机理分析(英文)显示文摘利用数字显示时间继电器、交流接触器、断路器以及电阻性负载设计了一个简易的触头材料实验电路。用该实验电路对五种银基触头材料AgCdO(12),Ag(Sn,In)O,AgZnO(10),AgNi(10),AgC(5)根据不同的开断电流、开断次数、闭合压力和配对方式进行了电弧侵蚀实验。根据实验结果得到了一些有实际意义的电弧侵蚀特性曲线。然后根据不同的开断电流及闭合压力对裂纹形貌进行了分析研究。最后,基于数学分析给出了用于判定出现滑移裂纹和热应力裂纹的理论判据。郭凤仪 王国强 董讷 Leuschner F.W. 2004中国电机工程学报2004,24,9:20
2经导管主动脉瓣植入术研究进展显示文摘随着人口结构的老龄化,主动脉瓣狭窄等心脏瓣膜病的发病率呈上升趋势。近年来,一种新的心血管介入治疗技术——经导管主动脉瓣植入术(TAVR)被临床试验证实其疗效,已被指南推荐治疗不能耐受外科手术或手术高危的严重主动脉瓣狭窄患者。随着新一代经导管植入心脏瓣膜系统的开发和TAVR术临床实践的深入,TAVR手术并发症将得到有效的控制,其适应证不断拓宽,给心脏瓣膜病的治疗带来新的突破。刘坤 李裕舒 Emmanuel Chorianopoulos Florian Leuschner 2016临床心血管病杂志2016,32,10:9
3Response of tree-ring width to climate warming and selective logging in larch forests of the Mongolian Altai显示文摘Aims The Mongolian Altai is an old settlement area,which is populated by pastoral nomads since 2000–3000 years.Forests in this region(at ca.2300 m a.s.l.)are highly fragmented and border on steppe and alpine grasslands,which are used for mobile livestock husbandry.The climate in Central Asia is warming to levels clearly above the global average,which affects the vegetation.Furthermore,the transition from planned to market economy and the decollectivization of livestock 20 years ago has strongly changed land use practices in Mongolia,especially resulting in an increase in recent logging activities.We were interested in the question how climate warming and selective logging influence the annual stem growth and the stand structure.Methods The impact of climate and land use by the pastoral nomads on the annual stem increment of more than 1800 trees of Siberian larch(Larix sibirica)was analyzed.Different groups of trees with divergent growth trends depending on the social position and stand history were identified by non-metric multidimensional scaling and analysis of similarities.Long-term trends in the annual stem increment were analyzed by establishing separate regional growth curves for trees of different age classes.Important Findings Instrumental climate data substantiate an increase of temperature by 2.1°C since 1940 at constant precipitation.Trees benefit from the increased temperatures.Climate–response analysis revealed that radial stem increment was promoted by the temperature in early summer,but also high precipitation in spring and in the year before tree-ring formation.Forest dynamics is also strongly influenced by anthropogenic activities.In addition to the natural forest dynamics,logging resulted in divergent growth trends within given age classes and habitats(forest interior and forest edge);overall,22 groups of trees with different characteristics in the annual radial stem increment were identified.A tree-ring series-based reconstruction of logging intensity since 1935 suggests that moderate selective logging occurred throughout the study period.However,selective logging was strongly intensified after 1990 as the result of the breakdown of the Communist regime in Mongolia and the transition from centrally planned to market economy.Because tree stump densities showed that the ratio of felled to live trees was 2:1 in the interior or even 0.9:1 at the edges of the forests and most logging occurred during the past 20 years,it must be concluded that the forests of the Mongolian Altai are presently exploited far beyond the level of sustainability.A close correlation of the ratio of felled to live trees with the density of summer camps of pastoral nomads in the vicinity suggests that trees are primarily felled by the local population.Choimaa Dulamsuren Mookhor Khishigjargal Christoph Leuschner Markus Hauck 2014Journal of Plant Ecology2014,7,1:5
4Androgen receptor expression in clinically localized prostate cancer: immunohistochemistry study and literature review显示文摘瞄准:评估雄激素受体(AR ) 在临床上局部性的前列腺癌症(PCa ) 的表示。方法:标本从没有 neoadjuvant,为临床上局部性的职业人员静电干扰腺癌经历了激进的前列腺切除术的 232 个病人被学习在我们在 2001 年 11 月和 2005 年 6 月之间的机构的神经质的治疗或化疗。Immunohistochemical 学习用反人的 AR 单音的同种细胞的抗体 AR441 被执行。在在一样的节以内的不同组织学的区域的热点的吝啬的 AR 密度被比较,有象格利森那样的参数获得的 clinicopathological 的恶意的上皮的 AR 密度的关联,肿瘤,节点和转移(TNM ) 上演并且预告的处理前列腺特定的抗原(PSA ) 价值被估计。结果:AR 免疫反应是几乎只原子的并且在肿瘤房间,非肿瘤的腺的上皮的房间和 peritumoral 的一个比例被观察并且内部腺的 stromal 房间。AR 积极的上皮的房间的吝啬的百分比在正常前列腺纸巾比那在癌症纸巾是显著地更高的(吝啬的± SD, 90.0% ± 9.3%vs .85.3% ± 9.7% , P < 0.001 ) 。组织学的分数产出类似的结果。AR 免疫的百分比反应专业版静电干扰癌症原子核和组织学的分数没在这个通过手术对待的队与象格利森分数,肿瘤,节点和转移舞台和预告的处理 PSA 价值那样的存在参数被相关。结论:现在的学习的结果建议可以为决定 AR 表示有有限临床的使用(如果在热点评估了) 在有局部性的 PCa 的人。Yi-Qing Qiu Ivo Leuschner Peter Martin Braun 2008Asian Journal of Andrology2008,10,6:4
5Oral budesonide and ursodeoxycholic acid for treatment of primary biliary cirrhosis:results of a prospective double-blind trial显示文摘Leuschner M Maier KP Schlichting J 1999Gastroenterology1999,117,:1
6The influence of sulindac on patients with primary biliary cirrhosis that responds incompletely to ursodeoxycholic acid:a pilot study显示文摘Leuschner M Holtmeier J Ackermann H 2002Eur J Gastroenterol Hepatol2002,14,12:1
7Molecular imaging of coronary atheros- clerosis and myocardial infarction: considerations for the bench and pers!~ectives for the clinic显示文摘Leuschner F Nahrendorf M 2011Circ Res2011,108,5:1
8Inflammatory myofibroblastic tumor显示文摘Leuschner I 0,,2:1
9Histamine and tyramine degradation by food fermenting microorganisms显示文摘Leuschner R G Heidel M Hammes W P 0,,1:1
10Variability in radial sap flux density patterns and sapwood area among seven co-occurring temperate broad-leaved tree species显示文摘Gebauer T Horna V Leuschner C 2008Tree Physiology2008,28,12:1
11The effect of bile salts and calcivm on isolated rat liver mitochondria 显示文摘 Zimmer G Leuschner M 1999Biochim Biophys Acta1999,1453,3:1
12Axial water flux dynamics in small diameter roots of a fast growing tropical tree显示文摘SENOCK R S LEUSCHNER C 1999Plant and Soil1999,208,:1
13Replication of a scenic preference func-tion显示文摘Buhyoff G J Leuschner W A 1980Forest Science11980,26,2:1
14Mesenchymal chondrosareoma of soft tissues and bone in children, adolescertts, and young adults: experiences of the CWS and Coss study groups 显示文摘Dantonello TM Int-Veen C Leuschner I 2008Cancer2008,112,11:1
15Patterns of fine root mass and distribution along a disturbance gradient in a tropical montane forest,central Sulawesi(Indonesia)显示文摘Leuschner C Wiens M Harteveld M 2006Plant and Soil2006,283,:1
16Subfossil European bog oaks : Population dynamics and long - term growth depres- sions as indicators of changes in the Holocene hydro- regime and climate显示文摘Leuschner H H Saas - Klassen U Jansma E 2002The Holocene2002,,12:1
17Influence of salinity on root hydraulic properties of three olive varieties显示文摘Rewald B Leuschner C Wiesman Z 2011Plant Bio- systems2011,145,1:1
18Primary biliary cirrhosis-presentation and diagnosis 显示文摘Leuschner U 2003Clin Liver Dis2003,7,4:1
19Depositional frequency of German subfossil oaks Climatically and non - climatically in- duced fluctuations in the Holocene 显示文摘Spurk M Leuschner H H Baillie M G L 2002The Holocene2002,,12:1
20Below-and above-ground biomass and net primary production in a paleotropical natural forest (Sulawesi,Indonesia) as compared to neotropical forests显示文摘Hertel D Moser G Culmsee H Erasmi S Horna V Schuldt B Leuschner C 0,,:1
返回顶部 每页显示:
共18页 首页 上一页 第1页 下一页 末页 /18 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