Electron transport through catechol-functionalized molecular rods

The charge transport properties of a catechol-type dithiol-terminated oligo-phenylene-ethynylene was investigated by cyclic voltammetry (CV) and by the scanning tunnelling microscopy break junction technique (STM-BJ). Single molecule charge transport experiments demonstrated the existence of high and low conductance regions. The junction conductance is rather weakly dependent on the redox state of the bridging molecule. However, a distinct dependence of junction formation probability and of relative stretching distances of the catechol- and quinone-type molecular junctions is observed. Substitution of the central catechol ring with alkoxy-moieties and the combination with a topological analysis of possible π-electron pathways through the respective molecular skeletons lead to a working hypothesis, which could rationalize the experimentally observed conductance characteristics of the redox-active nanojunctions.

The effect of surgical titanium rods on proton therapy delivered for cervical bone tumors: experimental validation using an anthropomorphic phantom.

To investigate the effect of metal implants in proton radiotherapy, dose distributions of different, clinically relevant treatment plans have been measured in an anthropomorphic phantom and compared to treatment planning predictions. The anthropomorphic phantom, which is sliced into four segments in the cranio-caudal direction, is composed of tissue equivalent materials and contains a titanium implant in a vertebral body in the cervical region. GafChromic® films were laid between the different segments to measure the 2D delivered dose. Three different four-field plans have then been applied: a Single-Field-Uniform-Dose (SFUD) plan, both with and without artifact correction implemented, and an Intensity-Modulated-Proton-Therapy (IMPT) plan with the artifacts corrected. For corrections, the artifacts were manually outlined and the Hounsfield Units manually set to an average value for soft tissue. Results show a surprisingly good agreement between prescribed and delivered dose distributions when artifacts have been corrected, with > 97% and 98% of points fulfilling the gamma criterion of 3%/3 mm for both SFUD and the IMPT plans, respectively. In contrast, without artifact corrections, up to 18% of measured points fail the gamma criterion of 3%/3 mm for the SFUD plan. These measurements indicate that correcting manually for the reconstruction artifacts resulting from metal implants substantially improves the accuracy of the calculated dose distribution.

Joan. Andr. Danzii Medaḳdeḳ sive Compendium grammaticae Hebraeae

opera et studio Joan. Henrici Zopfii

Joan Manén, Brustbild

Signatur des Originals: S 36/F05334

Joan Manén, Kniestück

Signatur des Originals: S 36/F05335

Grace Pedley, Rollenbild, Hüftbild, in: Joan of Arc

Signatur des Originals: S 36/F09498

Experiencia, lenguaje e identidad : Algunas notas sobre el concepto de experiencia en la obra de Joan W. Scott

Este artículo se propone analizar la noción de experiencia presente en la obra de la historiadora feminista norteamericana Joan W. Scott. Se realiza un recorrido por las conceptualizaciones de dicha noción utilizadas en la Historia Social de los años sesenta, setenta y ochenta con las cuales Scott ha tenido importantes diálogos y discusiones. Por último, se presentan algunas críticas y limitaciones que, tanto desde la historia con perspectiva de género como desde la teoría feminista, se han señalado sobre el concepto de experiencia desarrollada por Scott

Experiencia, lenguaje e identidad : Algunas notas sobre el concepto de experiencia en la obra de Joan W. Scott

Este artículo se propone analizar la noción de experiencia presente en la obra de la historiadora feminista norteamericana Joan W. Scott. Se realiza un recorrido por las conceptualizaciones de dicha noción utilizadas en la Historia Social de los años sesenta, setenta y ochenta con las cuales Scott ha tenido importantes diálogos y discusiones. Por último, se presentan algunas críticas y limitaciones que, tanto desde la historia con perspectiva de género como desde la teoría feminista, se han señalado sobre el concepto de experiencia desarrollada por Scott