207,408 research outputs found

    Numerical characterization of imperfection sensitive composite structures

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    The need to take the imperfection sensitivity of thin-walled unstiffened cylinders into account during the early design phases motivated the development of the NASA SP-8007 guideline, which brings an empirically based lower-bound curve that gives the knock-down factor (KDF) as a function of the cylinder’s radius and thickness. This guideline is still used also for composites, using correction. The conservativeness of these guidelines has been proved both stochastically by Arbocz, Starnes Jr., Hilburger, et al.; and deterministically by Geier, Hühne, Degenhardt, et al. A deterministic method: single perturbation load approach; developed by Hühne, showed that after some radial load (called P1) the imperfection sensitivity decreases, i.e. the buckling load remains nearly constant even increasing the radial load. Such physical benefit is not taken into account by the NASA SP-8007 guideline. This study, in the context of DESICOS, investigates the buckling mechanism of composite benchmark cylinder, developed by Zimmermann, being extreme-case laminates with high and low imperfection sensitivity. The explanation why the buckling load is constant after P1 is given and a physical meaning for the P1 value is proposed. These findings pave the way for the development of semi-analytical approaches for calculating P1. By applying the P1 value in the analysis, one can obtain less conservative KDFs which have shown to be closer to test results, allowing cost savings for the space industry

    Chantbook for Lipparella : by Walter Zimmermann

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    Lipparella omfattande samarbete med tonsättaren Walter Zimmermann har lett till porträttkonserter på Goethe Institutet och Fylkingen i Stockholm samt en CD inspelning på det tyska skivboladet World Edition. Zimmermann, som länge hört till de mest egensinniga komponisterna i Tyskland, har komponerat två nya verk för Lipparella med texter av Inger Christensen och Gunnar Ekelöf. Båda diktarnas inspelade röster ingår också i verken. Ensemblen har även studerat in redan befintlig musik av Zimmermann, delvis i nya versioner för ensemblens besättning. Här finns bland annat soloverk för alla i ensemblen, och fyra sånger med vardera ett instrument.  CD-inspelning</p

    Efeito da heterogeneidade da variância e da distribuição de probabilidade dos dados sobre o poder e tamanho do teste F1.

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    Estudou-se o efeito da heterogeneidade de variância dos tratamentos e da distribuição de probabilidade dos dados sobre o tamanho e o poder do teste F, em dois delineamentos experimentais: blocos ao acaso (com 3,5,7,9 e 11 tratamentos) e quadrado latino (tamanhos 3 x 3 ate 7 x 7). Os dados foram gerados a partir de sete distribuições probabilísticas (normal, uniforme, logística, Laplace, Weibull, exponencial e Cauchv). Para cada caso, geraram-se 10.000 experimentos e contou0se o numero de vezes que o teste F foi significativo, tantos nos casos de hipótese nula falsa, quanto verdadeira. Com base nesta contagem, concluiu-se que a não-normalidade dos dados não influenciou o tamanho e o poder do teste F, que só foram afetados quando houve heterogeneidade de variância. Recomenda-se, então, a transformação dos dados somente em casos de heterocedasticidade, principalmente quando associada a distribuição normal, pois ai, verificou-se que o teste F foi totalmente prejudicado no aspecto de tamanho do teste

    P. Savorgnan de Brazza

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    Zimmermann Maurice. P. Savorgnan de Brazza. In: Annales de Géographie, t. 14, n°78, 1905. pp. 462-463

    Der betagte Patient in der Implantatprothetik – zahntechnische Aspekte bei der Versorgung von Patienten im dritten und vierten Alter.

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    Im Fokus des Beitrags von ZTM Patrick Zimmermann und Prof. Dr. Martin Schimmel steht die implantatprothetische Behandlung von teilbezahnten oder zahnlosen Patienten aus Sicht der Zahntechnik. Patientenindividuelle Bedürfnisse und ihre Beachtung werden ebenso besprochen wie Verfahrenstechniken, Fragen der Materialwahl und die konzeptionelle Zusammenarbeit zwischen Zahnmediziner und Zahntechniker. Letztlich ist dieser Artikel ein Plädoyer für die moderne rekonstruktive Zahnmedizin, die für jeden Patienten ein hochwertiges Konzept bereithält – wobei er für deren Vielfalt und Variabilität sensibilisiert

    Chrysidea rhodopis ZIMMERMANN 1961

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    &lt;i&gt;Chrysidea rhodopis&lt;/i&gt; ZIMMERMANN 1961 &lt;p&gt; &lt;i&gt;Chrysidea rhodopis&lt;/i&gt; n.sp.: ZIMMERMANN 1961: 307 (descr., Madagascar), 320 (cat.).&lt;/p&gt; &lt;p&gt; &lt;i&gt;Chrysidea rhodopis&lt;/i&gt; ZIMMERMANN 1961: BOHART 1988: 130 (key).&lt;/p&gt; &lt;p&gt; &lt;i&gt;Chrysidea rhodopis&lt;/i&gt; ZIMMERMANN 1961: KIMSEY &amp; BOHART 1990: 314 (cat.).&lt;/p&gt; &lt;p&gt; &lt;i&gt;Chrysidea rhodopis&lt;/i&gt; ZIMMERMANN 1961: MADL 2008: 84 (Madagascar), 90 (cat., Madagascar).&lt;/p&gt; &lt;p&gt;D i s t r i b u t i o n: Madagascar: Prov. Mahajanga: Katsepy &ndash; Prov. Antananarivo: Antananarivo, Antsirabe &ndash; Prov. Toliara: Baie de Saint Augustin, Bekily.&lt;/p&gt; &lt;p&gt;Endemic.&lt;/p&gt;Published as part of &lt;i&gt;C. O, Madl, M. &amp; Olmi, M., 2010, A Catalogue of the Bethylidae, Chrysididae, Dryinidae, Embolemidae, Sclerogibbidae and Scolebythidae (Hymenoptera: Chrysidoidea) of the Malagasy Subregion, pp. 845-918 in Linzer biologische Beiträge 42 (2)&lt;/i&gt; on page 860, DOI: &lt;a href="http://zenodo.org/record/5335096"&gt;10.5281/zenodo.5335096&lt;/a&gt

    MM P. et Fr. Sarasin à Célebes

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    Zimmermann Maurice. MM P. et Fr. Sarasin à Célebes. In: Annales de Géographie, t. 6, n°25, 1897. pp. 93-94

    Nouvelle traversée de Célebes par MMrs P. et Fr. Sarasin

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    Zimmermann Maurice. Nouvelle traversée de Célebes par MMrs P. et Fr. Sarasin. In: Annales de Géographie, t. 13, n°67, 1904. pp. 91-92

    Nouvelle traversée de Célebes par MMrs P. et Fr. Sarasin

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    Zimmermann Maurice. Nouvelle traversée de Célebes par MMrs P. et Fr. Sarasin. In: Annales de Géographie, t. 13, n°67, 1904. pp. 91-92
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