Morphological, compositional, and geometrical transients of V-groove quantum wires formed during metalorganic vapor-phase epitaxy

We present a theoretical model of the formation of self-limited (Al) GaAs quantum wires within V-grooves on GaAs(001) substrates during metalorganic vapor-phase epitaxy. We identify the facet-dependent rates of the kinetic processes responsible for the formation of the self-limiting profile, which is accompanied by Ga segregation along the axis perpendicular to the bottom of the original template, and analyze their interplay with the facet geometry in the transient regime. A reduced model is adopted for the evolution of the patterned profile, as determined by the angle between the different crystallographic planes as a function of the growth conditions. Our results provide a comprehensive phenomenological understanding of the self-ordering mechanism on patterned surfaces which can be harnessed for designing the quantum optical properties of low-dimensional systems. (C) 2013 AIP Publishing LLC

Role of the edge electric field in the resonant mode-particle interactions and the formation of transport barriers in toroidal plasmas

The impact of an edge radial electric field on the particle orbits and the orbital spectrum in an axisymmetric toroidal magnetic equilibrium is investigated using a guiding center canonical formalism. Poloidal and bounce/transit-averaged toroidal precession frequencies are calculated, highlighting the role of the radial electric field. The radial electric field is shown to drastically modify the resonance conditions between particles with certain kinetic characteristics and specific perturbative non-axisymmetric modes and to enable the formation of transport barriers. The locations of the resonances and the transport barriers, that determine the particle, energy and momentum transport are shown to be accurately pinpointed in the phase space, by employing the calculated orbital frequencies.Comment: 23 pages, 8 figure

The passion about amateur history on the Greek web during the current economic crisis

International audienceDuring the current economic crisis Greeks have increasingly started debating the recent past. The online discussions are not limited to political history but touch fields such as the history of gender relations, the history of Europeanization and consumption politics. This trend was expressed in social media groups, forum threads etc. This presentation examines this willingness for the production of amateur history, the characteristics and the motivation of this creativity arguing that this historical production relates to the crisis twofold: first, it is the outcome of an increasing nostalgia about a more prosperous, safer and optimist recent past. Second, explores how this ‘historical creativity’ can be explained as a consequence of the recent politicization of the public space formulating suggestions on how aspects of the recent past are used as material in the formulation of arguments justifying choices in the present. Finally, drawing on the assumption that visual material plays a key role in the formulation of communities discussing contemporary history the presentation questions the role of images in the construction of such narrations

Προβλήματα Δυναμικής Φορτισμένων Σωματιδίων σε Θερμοπυρηνικό Πλάσμα

Η μη γραμμική αλληλεπίδραση ιόντων σε μαγνητισμένο πλάσμα με την περιβάλλουσα υψίσυχνων ηλεκρομαγνητικών ρυθμών μελετάται διεξοδικά. Επιτυγχάνεται η έκφραση της Χαμιλτονιανής του γυρόκεντρου σε ισορροπία tokamak ως συνάρτηση δράσεων γωνιών. Με αυτόν τον τρόπο ανοίγει ο δρόμος για την εφαρμογή κανονικών θεωριών διαταραχών στη μελέτη της δυναμικής του γυρόκεντρου υπό την επίδραση μαγνητικών και ηλεκτρομαγνητικών διαταραχών

Cases of charged particle dynamics in thermonuclear plasmas

The nonlinear interaction between ions in magnetised plasmas and high frequency electromagnetic beat waves is studied. The Hamiltonian of the gyrocenter motion in tokamak equilibria is brought in an action angle form. This enables the application of canonical perturbation theories for the study of the gyrocenter dynamics in the presence of magnetic and electromagnetic perturbations.Η μη γραμμική αλληλεπίδραση ιόντων σε μαγνητισμένο πλάσμα με την περιβάλλουσα υψίσυχνων ηλεκρομαγνητικών ρυθμών μελετάται διεξοδικά. Επιτυγχάνεται η έκφραση της Χαμιλτονιανής του γυρόκεντρου σε ισορροπία tokamak ως συνάρτηση δράσεων γωνιών. Με αυτόν τον τρόπο ανοίγει ο δρόμος για την εφαρμογή κανονικών θεωριών διαταραχών στη μελέτη της δυναμικής του γυρόκεντρου υπό την επίδραση μαγνητικών και ηλεκτρομαγνητικών διαταραχών

Deliverable 9.6: Intermediate report after one year of measurement

The present document is the Deliverable D9.6 “Intermediate report after one year of measurement”. The document describes the work carried out within the task 9.5 entitled “Overall evaluation and impact analysis for impact enhancement”. The focus of this task is to provide intermediate results of the demonstration activities in the three Lighthouse (LH) cities and to present the data currently transferred to the IRIS Key Performance Indicators (KPI) tool. The deliverable D9.6 is based on the work done in the Work Package (WP) 9, in particular the work in task 9.4 and task 9.5 (presented previously in D9.4 and D9.5). In this deliverable, the monitoring framework and established baselines developed in D9.5 are used to collect the data needed for the calculation of the KPIs. The KPIs are in turn used to evaluate the outcome and impact of the implemented measures. The collected data is transferred to the KPI tool, which was created and presented in D9.4. The tool processes and calculates the KPIs and visualizes the results. Data can be transferred to the KPI tool automatically, through a CIP, or manually through a template. A process which is described in this deliverable. This deliverable was intended to be an intermediate report to provide an initial insight to the results for all measures in the IRIS project. However, due to the lack of data from measures, which in part is due to the Covid-19 pandemic, this report focuses more on providing information about the process of collecting data and transferring it into the KPI tool. This process is collaborative and has been carried out within the IRIS LH cites with support from the technical partners and the WP9 team. Complexity of APIs and the lack of standards have made data extraction and transfer into the KPI tool more difficult. Furthermore, not all measures in IRIS are connected to CIP which means that manual data collection was required and a systematic procedure for this collection needed to be developed and introduced to the partners. There are several different reasons for lack of data and the resulting exclusion of some measures from this deliverable. A few measures are not yet in operation, while for other data collection have not started or the data transfer to the KPI tool has not been established yet. However, the work done in task 9.5 has provided new knowledge on issues and errors that can occur in the process of transferring data and establishing KPIs. Through dialogues with the project partners, the need to clarify some KPI cards with i.e. units, formulas or use cases has been highlighted. The close cooperation with the project partners has led to continued work on the definitions of the KPIs and what KPIs to include, taking steps in the direction of clearer interpretation and more consistent use. Further adaptation of several KPI-cards was done by the WP9 team. In the process of adjusting KPIs, the effect these adjustments would have on all measures that use them were considered. The process of developing KPIs involves a balance between finding indicators that can be used more generally and indicators that are more specific and thus better capture the purpose of a specific measure. The improvements of KPIs and lessons learned in task 9.5 will be of great use in the continued work of WP9. Focus will be on transfer of data from all measures into the KPI tool. A continuous dialogue with responsible project partners to ensure this data transfer and discussions on deviation and errors in the initial results will be established.Horizon 2020Grants Agreement No 774199IRIS Integrated and Replicable Solutions for Co-Creation in Sustainable Citie

Deliverable 9.6: Intermediate report after one year of measurement

The present document is the Deliverable D9.6 “Intermediate report after one year of measurement”. The document describes the work carried out within the task 9.5 entitled “Overall evaluation and impact analysis for impact enhancement”. The focus of this task is to provide intermediate results of the demonstration activities in the three Lighthouse (LH) cities and to present the data currently transferred to the IRIS Key Performance Indicators (KPI) tool. The deliverable D9.6 is based on the work done in the Work Package (WP) 9, in particular the work in task 9.4 and task 9.5 (presented previously in D9.4 and D9.5). In this deliverable, the monitoring framework and established baselines developed in D9.5 are used to collect the data needed for the calculation of the KPIs. The KPIs are in turn used to evaluate the outcome and impact of the implemented measures. The collected data is transferred to the KPI tool, which was created and presented in D9.4. The tool processes and calculates the KPIs and visualizes the results. Data can be transferred to the KPI tool automatically, through a CIP, or manually through a template. A process which is described in this deliverable. This deliverable was intended to be an intermediate report to provide an initial insight to the results for all measures in the IRIS project. However, due to the lack of data from measures, which in part is due to the Covid-19 pandemic, this report focuses more on providing information about the process of collecting data and transferring it into the KPI tool. This process is collaborative and has been carried out within the IRIS LH cites with support from the technical partners and the WP9 team. Complexity of APIs and the lack of standards have made data extraction and transfer into the KPI tool more difficult. Furthermore, not all measures in IRIS are connected to CIP which means that manual data collection was required and a systematic procedure for this collection needed to be developed and introduced to the partners. There are several different reasons for lack of data and the resulting exclusion of some measures from this deliverable. A few measures are not yet in operation, while for other data collection have not started or the data transfer to the KPI tool has not been established yet. However, the work done in task 9.5 has provided new knowledge on issues and errors that can occur in the process of transferring data and establishing KPIs. Through dialogues with the project partners, the need to clarify some KPI cards with i.e. units, formulas or use cases has been highlighted. The close cooperation with the project partners has led to continued work on the definitions of the KPIs and what KPIs to include, taking steps in the direction of clearer interpretation and more consistent use. Further adaptation of several KPI-cards was done by the WP9 team. In the process of adjusting KPIs, the effect these adjustments would have on all measures that use them were considered. The process of developing KPIs involves a balance between finding indicators that can be used more generally and indicators that are more specific and thus better capture the purpose of a specific measure. The improvements of KPIs and lessons learned in task 9.5 will be of great use in the continued work of WP9. Focus will be on transfer of data from all measures into the KPI tool. A continuous dialogue with responsible project partners to ensure this data transfer and discussions on deviation and errors in the initial results will be established.Horizon 2020Grants Agreement No 774199IRIS Integrated and Replicable Solutions for Co-Creation in Sustainable Citie