97,481 research outputs found
Bond Anchorage of Pretensioned Frp Tendon At Force Release
No full textThe anchorage of fiber-reinforced plastic (FRP) tendons in pretensioned prestressed concrete (PC) members may cause the formation of cracks as a result of tendon wedge effect and mechanical interlocking during prestress force transfer. This paper presents experimental results obtained with a braided epoxy-impregnated aramid FRP tendon having a 16-mm nominal diameter and initial prestress force of 125.6 kN. Minimum concrete cover was 52 mm. End-zone reinforcement and tendon partial blanketing were used to determine their effect on concrete stress field intensity and on cracking due to prestress force transfer. It was found that steel stirrups do not prevent cracking, but they limit its propagation. A carbon FRP coil of small pitch inhibits crack formation, but the concrete tensile strain remains high. Partial blanketing is the most effective solution, causing only a limited increase in transfer length (approximately 20%). An analytical solution to the experiment was obtained by using the finite clement method, assuming a partly cracked elastic concrete ring model. This proved to be an effective tool for predicting the occurrence of cracks when using tendons of different size and/or initial prestress force
Joshua Davis: Author of Spare Parts
No full textCitation: K-State First (2016). Joshua Davis: Author of Spare Parts [Flier]. Manhattan, Kansas: K-State First.Flyer advertising Joshua Davis's author talk at Kansas State University
Molecular dynamics of C-60 in superconducting Na2CsC60
No full textWe have measured the low-energy inelastic neutron scattering spectra of
superconducting Na2CsC60 in the temperature range 100-350 K.
Well-defined librational peaks are observed at 2.7(1) meV; their
position and width are temperature independent. They survive well above
the order-disorder transition at 299 K. A quasielastic feature with a
width 1.03(6) meV at an average scattering vector of 1.09 Angstrom(-1)
is observed at 350 K, arising from diffusive motion of the C-60(3-)
ions. Evidence is found for influence of the Na+ ions on the rotational motion of the C-60(3-) ions
Electron spin resonance study of the polymeric phase of Na2RbC60
No full textThe structural and electronic properties of the polymeric phase of Na2RbC60 which comprises of C-C bridged
C-60(3-) chains have been studied between 410 and 4 K with the electron spin resonance (ESR) technique. On cooling,
the polymeric phase starts growing below similar to 250 K. Its fraction reaches a maximum at similar to 190 K, where
around 55% of the monomeric cubic phase have transformed to the polymer. The temperature dependence of the ESR
susceptibility suggests that the Na2RbC60 polymer is conducting down to 3 K. The ESR results exclude the possibility of
the existence of a ground-state instability and the formation of either a spin-density-wave (SDW) or a charge-densitywave
(CDW) sta
Steven Johnson Author Talk Poster
No full textK-State Book NetworkA poster advertising an author talk by Steven Johnson at Kansas State University on September 3, 2014. Steven Johnson's book "The Ghost Map" was the 2014-2015 common book
Stacking-fault structure explains unusual elasticity of nanocrystalline diamonds
No full textTanei H., Tanigaki K., Kusakabe K., et al. "Stacking-fault structure explains unusual elasticity of nanocrystalline diamonds", Applied Physics Letters, 94(4), 041914 (2009) https://doi.org/10.1063/1.3077124.This letter reveals that unusual elasticity of nanocrystalline diamond is consistently explained by stacking fault inside the diamond grains instead of the graphitic plate inclusion, which was only possible mechanism. Ab initio calculation shows that stacking fault introduced in the diamond structure behaves as graphitic s p2 bonds, and the elastic constants calculated from the strain-energy relationship agree with the acoustic measurements. © 2009 American Institute of Physics
Selective overexpression of Comt in prefrontal cortex rescues schizophrenia-like phenotypes in a mouse model of 22q11 deletion syndrome
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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
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