179,988 research outputs found
Covariance properties of higher genus twist correlators under R↔ 1 R durability in orbifold conformal field theory
No full textWe study R↔ 1 R duality in simple orbifold models at arbitrary orders in string perturbation theory. It is shown that duality involves certain linear relations among twist correlators at dual radii. We derive general expressions for the coefficients of these relations and show that they can be expressed in terms of functions of the orbifold cosets obeying an algebra bearing a striking resemblance to Verlinde's fusion rule algebra. Finally, we study the behavior of the coefficients under factorization, in particular their dependence on the genus. A few examples are worked out. © 1990
Pietro Torelli. Le carte degli archivi Reggiani fino al 1050. Con la collaborazione delle Sigg. Prof. Anna K. Casotti e Prof. Fernanda Tassoni. (Pubblicazione a cura della R. Deputazione di Storia Patria, Sottosezione di Reggio-Emilia, ed a spese della Banca agricola commerciale di Reggio-Emilia.) Reggio-Emilia, cooperativa Lavoranti Tipografi, 1921.
No full textLauer Philippe. Pietro Torelli. Le carte degli archivi Reggiani fino al 1050. Con la collaborazione delle Sigg. Prof. Anna K. Casotti e Prof. Fernanda Tassoni. (Pubblicazione a cura della R. Deputazione di Storia Patria, Sottosezione di Reggio-Emilia, ed a spese della Banca agricola commerciale di Reggio-Emilia.) Reggio-Emilia, cooperativa Lavoranti Tipografi, 1921.. In: Bibliothèque de l'école des chartes. 1922, tome 83. pp. 189-191
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Einfluss der Laengsausdehnung des Brennflecks auf den Kontrast von Biprisma-Interferenzen im ausseraxialen Bereich. Zur Bestimmung von Rauschspektren homogen belichteter Photoplatten
No full textLauer, R.: Einfluss der Laengsausdehnung... Ade, G.: Zur Bestimmung von Rauschspektren...SIGLECopy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
[CL2FES2MO0(S2)]2-, A NOVEL BIMETALLIC COMPLEX WITH UNUSUAL ELECTRONIC-STRUCTURE AND A SUBSTITUTED TETRACHALCOGENOMETALATE AS LIGAND
No full textMüller A, SARKAR S, Bögge H, JOSTES R, TRAUTWEIN A, LAUER U. [CL2FES2MO0(S2)]2-, A NOVEL BIMETALLIC COMPLEX WITH UNUSUAL ELECTRONIC-STRUCTURE AND A SUBSTITUTED TETRACHALCOGENOMETALATE AS LIGAND. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH. 1983;22(7):561-562
Healing of complex damage modes in model composites
No full textSelf-healing has potential to extend the usable lifetime of composite materials. Introducing self-healing systems to fiber reinforced composites has proven to be difficult due to the high temperatures and pressures of processing as well as the requirement that the delivery scheme for the healing agent must exist in the interstitial regions between fibers. Additionally, assessment of self-healing performance for composites poses a challenge as many damage modes occur during composite failure including matrix cracking and fiber-matrix debonding.
In this thesis, a tow-level model composite test is developed with a view towards simplifying characterization and improving understanding of capsule-based self-healing in fiber reinforced composites. The tow-level test is intended to allow for testing of potential healing without requiring manufacture of a complex composite panel. A modified compact tension is developed with a carbon fiber tow running orthogonally to the advancing crack plane. Initial testing of a non-healing control system reveals that the tow can survive crack propagation and that debonding of the matrix and tow occurs. Additionally, the size of the debonding damage correlates to the magnitude of energy released.
Healing studies utilized a phase-separated thermoplastic-epoxy matrix with solvent filled microcapsules. Initial reference tests with the matrix but no microcapsules showed high healing efficiency of over 100% when the solvent was injected manually. However, no mechanical healing response could be observed when microcapsules were incorporated to deliver healing agent to the crack. Attempts were made at altering the healing agent delivery scheme as well as the healing conditions to increase healing response, but no combination of conditions was shown to be suitable for self-healing to occur.Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-03-13 without embargo termsThe student, Andrew Lauer, accepted the attached license on 2017-12-15 at 10:16.The student, Andrew Lauer, submitted this Thesis for approval on 2017-12-15 at 10:25.This Thesis was approved for publication on 2017-12-15 at 13:11.DSpace SAF Submission Ingestion Package generated from Vireo submission #11994 on 2018-03-13 at 10:12:55Made available in DSpace on 2018-03-13T15:49:22Z (GMT). No. of bitstreams: 2
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Previous issue date: 2017-12-1
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