Investigations of surface plasmon resonances by energy-filtering transmission electron microscopy methods

This thesis concentrates on different plasmonic phenomena which are observed with a transmission electron microscope (TEM) in combination with electron energy loss spectroscopy (EELS) and energy-filtering transmission electron microscopy (EFTEM) techniques offering high energy and spatial resolution. Plasmonic coupling behaviour of nanoholes and nanoparticles having rectangular, circular, triangular etc. shapes were investigated using different techniques. The electromagnetic nature of the observed situations was unveiled with different simulation techniques based on discrete dipole approximation (DDA), finite element method (FEM), and three-dimensional finite-difference time-domain methods (3D-FDTD)

Grinding and Abrading Activities in the Earlier Neolithic of Northern Greece

Despite their widespread presence and potential to shed light on various aspects of prehistoric life, for a long time Neolithic macrolithics attracted little scholarly attention. The situation, however, is rapidly changing as more and more assemblages are being studied and published systematically. The study of the grinding and abrading tools from the earlier Neolithic site of Pontokomi-Souloukia in northern Greece is part of this recent trend, as it integrates macroscopic examination, use wear, microbotanical and macrobotanical analysis, an experimental program, ethnographic data, as well as contextual analysis. In this article, we present the results of our study and make comparisons with other assemblages, placing the Pontokomi-Souloukia material in its wider Aegean Neolithic context

Uncovering hidden genetic variation in photosynthesis of field‐grown maize under ozone pollution

Ozone is the most damaging air pollutant to crops, currently reducing Midwest US maize production by up to 10%, yet there has been very little effort to adapt germ‐ plasm for ozone tolerance. Ozone enters plants through stomata, reacts to form reactive oxygen species in the apoplast and ultimately decreases photosynthetic C gain. In this study, 10 diverse inbred parents were crossed in a half‐diallel design to create 45 F1 hybrids, which were tested for ozone response in the field using free air concentration enrichment (FACE). Ozone stress increased the heritability of pho‐ tosynthetic traits and altered genetic correlations among traits. Hybrids from par‐ ents Hp301 and NC338 showed greater sensitivity to ozone stress, and disrupted relationships among photosynthetic traits. The physiological responses underlying sensitivity to ozone differed in hybrids from the two parents, suggesting multiple mechanisms of response to oxidative stress. FACE technology was essential to this evaluation because genetic variation in photosynthesis under elevated ozone was not predictable based on performance at ambient ozone. These findings suggest that selection under elevated ozone is needed to identify deleterious alleles in the world's largest commodity crop

Onset of magnetism in B2 transition metals aluminides

Ab initio calculation results for the electronic structure of disordered bcc Fe(x)Al(1-x) (0.4<x<0.75), Co(x)Al(1-x) and Ni(x)Al(1-x) (x=0.4; 0.5; 0.6) alloys near the 1:1 stoichiometry, as well as of the ordered B2 (FeAl, CoAl, NiAl) phases with point defects are presented. The calculations were performed using the coherent potential approximation within the Korringa-Kohn-Rostoker method (KKR-CPA) for the disordered case and the tight-binding linear muffin-tin orbital (TB-LMTO) method for the intermetallic compounds. We studied in particular the onset of magnetism in Fe-Al and Co-Al systems as a function of the defect structure. We found the appearance of large local magnetic moments associated with the transition metal (TM) antisite defect in FeAl and CoAl compounds, in agreement with the experimental findings. Moreover, we found that any vacancies on both sublattices enhance the magnetic moments via reducing the charge transfer to a TM atom. Disordered Fe-Al alloys are ferromagnetically ordered for the whole range of composition studied, whereas Co-Al becomes magnetic only for Co concentration >0.5.Comment: 11 pages with 9 embedded postscript figures, to be published in Phys.Rev.

(Dis)Claiming Identity: Christina García’s The Agüero Sisters and Julia Alvarez\u27 How the García Girls Lost Their Accents

Christine Garcia\u27s The Aguero Sisters and Julia Alvarez\u27s How the Garcia Girls Lost Their Accents are novels that revolve around the conflicts and tensions among the members of the two immigrant families, the Aguero sisters from Cuba and the Garcia sisters from the Dominican Republic, arising mainly from their need to come to terms with their ambiguous identities. This article focuses on the ways in which the Aguero and Garcia sisters through their hybrid identities overcome boundaries and exclusive categories so as to challenge homogenizing, hegemonic systems, and open vistas into new, non-essentialist modes of identity that still can be represented in their specific configurations

Creating transformative spaces through storytelling : #MeWeSyria- A case study

Oppression of voice has continued for displaced Syrians, beyond the ‘kingdom ofsilence’ under the Assad dictatorship, in the form of dominant media narratives, oftennegative, which fail to represent their lived realities. This case study explored the waysin which storytelling, within the program #MeWeSyria, creates a space for Syrianvoices in southeast Turkey and how this space could be transformative. The researchfocused on the process of storytelling, as a process of voice (Couldry, 2010) rather thanthe stories themselves as media products. Eleven semi-structured interviews wereconducted with members of the #MeWeSyria community, from three different levels:participants, facilitators and staff. Analysis considered the characteristics of the#MeWeSyria space, in relation to providing a space for the process of voice to flourish,in light of Wheeler et al.’s (2018) ‘transformative storywork’, and demonstrated theways in which this space could be transformative on personal, interpersonal and broadercommunity-societal levels. This research suggests that #MeWeSyria creates a space forSyrian voices by operating as a Syrian-led, participatory, community space whichcreates the conditions for the process of voice to flourish. In this space, personal andcollective consciousness and a sense of agency is developed, which are revealed as thestarting point for engagement in action for further change, on interpersonal, communityand societal levels. #MeWeSyria is shown to defend, at its core, voice as value(Couldry, 2010), the right of each person to tell their own story and the principle thatevery voice matters

Creating transformative spaces through storytelling : #MeWeSyria- A case study

Oppression of voice has continued for displaced Syrians, beyond the ‘kingdom ofsilence’ under the Assad dictatorship, in the form of dominant media narratives, oftennegative, which fail to represent their lived realities. This case study explored the waysin which storytelling, within the program #MeWeSyria, creates a space for Syrianvoices in southeast Turkey and how this space could be transformative. The researchfocused on the process of storytelling, as a process of voice (Couldry, 2010) rather thanthe stories themselves as media products. Eleven semi-structured interviews wereconducted with members of the #MeWeSyria community, from three different levels:participants, facilitators and staff. Analysis considered the characteristics of the#MeWeSyria space, in relation to providing a space for the process of voice to flourish,in light of Wheeler et al.’s (2018) ‘transformative storywork’, and demonstrated theways in which this space could be transformative on personal, interpersonal and broadercommunity-societal levels. This research suggests that #MeWeSyria creates a space forSyrian voices by operating as a Syrian-led, participatory, community space whichcreates the conditions for the process of voice to flourish. In this space, personal andcollective consciousness and a sense of agency is developed, which are revealed as thestarting point for engagement in action for further change, on interpersonal, communityand societal levels. #MeWeSyria is shown to defend, at its core, voice as value(Couldry, 2010), the right of each person to tell their own story and the principle thatevery voice matters