English

Vacuum electron devices (VEDs) can experience degraded performance, including complete failure, due to multipactor breakdown (MPB). This effect is tied to the production and acceleration of secondary electrons due to electron impact and coupling to the RF fields. In order to better understand the initiation of MPB with materials of interest, researchers at the University of New Mexico (UNM) are carrying out a study of the secondary electron yield (SEY) contribution from various materials used in high power VEDs. This work describes SEY data from electron bombardment in the low energy regime, from 10 eV to 1 keV, on Cu as a baseline material, - stainless steel, aluminum 6061 (Al) and Invar (Fe64/Ni36). SEY data for Cu as a function of incident beam angle is also presented. In addition, different surface cleaning treatment protocols employed in this study will be described.

This study stylistically analyzes a poem, "The Innocent Killings", by an anonymous poet, Jasmine. The poem has been analyzed at morphological, lexico-syntactical, and graphological levels where thematic and foregrounding elements have been used. Moreover, the unique deviation and parallelism have been taken as a suggestion to the spirit of the age. Various stylistic features in the context of brutal terrorism have been employed in the poem to convey the denser ideas and traumatic sufferings of the nation. The researchers also explored the unique structure of the poem carrying different moods and troops with proper choice of dictions in each portion. The stylistic techniques in the poem move parallel to the tone of the mood, such as; the use of progressive verbs, abstract nouns, symbol device like "Jasmine", and lack of the main verb in the last three lines of the poem shows a failure to defend the nation from terrorist attacks