Suchergebnisse

The work needed to mechanically drive molten metal into a porous solid preform when producing a composite material by infiltration can significantly exceed the energy change required for thermodynamically reversible infiltration. We measure, by quantitative metallographic analysis of partially infiltrated, particle- or fiber-based non-metallic preforms, the evolution with saturation of the three interfaces present during the process. Results show that irreversible energy losses in the infiltration of alumina preforms by molten copper, aluminium or aluminium-tin alloy cannot be ascribed to the creation of liquid meniscus surface area at intermediate metal saturation. This result agrees with similar observations in soil science and gives experimental confirmation of predictions from a recent simulation of capillarity-dominated metal infiltration [Acta Mater., vol. 210, 2021, 116831]. ; This work was chiefly sponsored by the Swiss National Science Foundation (FNS), Project No. 200021 149899. J.M. Molina-Jordá acknowledges funding from the Spanish "Agencia Estatal de Investigación" (AEI) and the European Union (FEDER funds) through grant MAT2016-77742-C2-2-P.

The purpose of this work is to establish of the bound oxygen effect on the phase composition of the Semi-Insulating Polycrystalline Oxygen-doped Silicon (SIPOS) films by means of three independent methods: X-ray diffraction (XRD), Ultrasoft X-ray Emission Spectroscopy (USXES) and Raman spectroscopy, also on their electrophysical properties, depending on the relative oxygen content in the gas mixture flow (γ=N2O/SiH4) of the plasma reactor during the chemical vapor deposition of submicron SIPOS layers on monocrystalline silicon wafers. The increase in the oxygen content in SIPOS layers from γ=0 to maximum at γ=0.15 leads to the reduction of Si nanocrystals size from ~75 nm to 2–5 nm, submerged in amorphous matrix. Oxygen is contained in the bound form of silicon-oxygen clusters SiOSi3 type in the amorphous silicon matrix without SiO2 formation. These nonlinear qualitative and quantitative changes in the atomic structure of the SIPOS layers under the influence of bound oxygen increase not only the resistivity of the films by two orders of magnitude but also the activation energy of conductivity in comparison with silicon at the temperatures above room temperature. © 2020 Elsevier Ltd ; Russian Foundation for Basic Research, RFBR: 19-42-363013 ; MD-42.2019.2 ; Ministry of Science and Higher Education of the Russian Federation ; The reported study was funded by RFBR and Government of Voronezh region according to the research project № 19-42-363013. ; The part of work was carried out with the support of the Ministry of Science and Higher Education of Russia Federation under the grand No. FZGU-2020-0036 .In part of diagnostics of the structures the work of P.V. Seredin was supported by the RF President's Grants Council (Grant MD-42.2019.2).

Discrimination against minority groups still occurs in Indonesia, both in the form of verbal and non-verbal violence. The last discrimination that occurred was the closure of the Ahmadiyah Mosque in Garut, West Java in 2021. According to Foucault, discrimination occurs due to the existence of a power system to regulate knowledge and hegemony in society through the normalization of knowledge which is a tool of power so that discrimination and even intolerance can be justified in society. The Wawuh boardgame is a medium for spreading tolerance and peace through 9 basic human rights, namely; the right to life, the right to receive, the right to work, the right to health, the right to education, the right to facilities, the right to protection, the right to voice, and the right to administration. This study aims to determine the extent of changes in perspective and behavior of tolerance after playing the Wawuh Boardgame. This game is played to members of the Scouts of UIN Sunan Gunung Djati Bandung Batch 39 who have not been exposed to the issue of peace and violence based on minority group discrimination. This research method uses a combined qualitative and quantitative approach because the data collection uses a questionnaire whose results will be described in written form and the researcher can describe with a clear purpose. The results and discussion of this study prove that there is an attitude of tolerance and a change in perspective by 86% as well as increasing information about minority groups against members of the Scouts of UIN Sunan Gunung Djati Bandung Batch 39. The conclusion of this study is that the Wawuh Boardgame is effective in campaigning for peace and can introduce minority groups as well as being able to prevent discrimination at all levels.

La evolución de la radio en los últimos años ha derivado en una creciente presencia y utilización de las redes sociales como canal de comunicación con sus audiencias y la aparición de nuevas narrativas. Esta investigación explora el tratamiento que las cuatro principales cadenas radiofónicas españolas -SER, COPE, Onda Cero y Radio Nacional de España- realizaron en Instagram durante la investidura de Pedro Sánchez como presidente del Gobierno de España. Del análisis de contenido cuantitativo y cualitativo realizado se deriva que la implantación de la radio en Instagram es, todavía, incipiente en algunos casos, pero que, sin embargo, cadenas como SER y COPE ya aplican nuevas narrativas en la red social. La radio emplea Instagram para informar y también como espacio para los géneros opinativos, y lo hace con un impacto notable en las comunidades de seguidores. ; Radio's evolution in recent years is characterised by the growing presence and use of social networks as communication channels with their audiences and the emergence of new narratives. This research explores the coverage carried out by the four main Spanish radio stations - Cadena SER, COPE, Onda Cero and Radio Nacional de España - through their Instagram accounts during the inauguration of Pedro Sánchez as President of the Government of Spain. The results obtained from an analysis of quantitative and qualitative content reveal that, in some cases, the introduction of radio on Instagram is still in its infancy. However, stations such as SER and COPE have already implemented new narratives in this social network. The radio uses Instagram to inform and also as a platform for opinion genres having a significant impact on the communities of followers. ; Este trabajo ha sido realizado en el marco del Grupo de Investigación en Comunicación e Información Digital (GICID) de la Universidad de Zaragoza, reconocido como grupo de referencia por el Gobierno de Aragón con el código S29_20R (Núm. 62 del Boletín Oficial de Aragón, de fecha 26/03/2020), dentro del área de Ciencias Sociales y financiado por el Fondo Social Europeo de Desarrollo Regional, FEDER "Construyendo Europa desde Aragón".

Insufficiency of water resources in the Middle East Region represents vital factors that influence the stability of the region and its progress. Expectations indicate that the condition will be dimmer and more complicated, especially in Iraqi territory. Iraq, which is situated in the Middle East, it covers an area of 433,970 square kilometers and populated by about 32 million inhabitants. Iraq greatly relies in its water resources on the Tigris and Euphrates Rivers as a surface water resources, and several productive groundwater aquifers in which from the hydrogeological point of view divided into several major aquifer units including Foothill, Al-Jazira, Aquifer System, Mandali-Badra-Teeb, Mesopotamian and Desert Aquifer system. Recently, Iraq is suffering from water shortage problems. This is due to external and internal factors affecting the water quality of water resources; they are controlled and uncontrolled factors. The uncontrolled factors are climate change and its consequences, such as reduction of precipitation and temperature increasing. The controlled factors have a significantly negative influence on water resources, but their effects involve more specific regions. The controlled factors are mainly represented by building dams and irrigation projects within the upper parts of the Tigris and Euphrates catchments, Al-Tharthar Scheme, waste water, solid wastes and wastes from wars, which has a significant effect on surface water in Iraq because about 80% of the water supply to Euphrates and Tigris Rivers come from Turkey. In addition, the pressures resulting from the high demand for water resources, and the continued decline in their quantity rates have led to major changes in the hydrological condition in Iraq during the past 30 years. The decrease in surface water levels and precipitation during these three decades reflects the drop in the levels of water reservoirs, lakes, and rivers to the unexpected levels. The level of main country's water source, Tigris, and Euphrates Rivers has fallen to less than a third of its natural levels. As storage capacity depreciates, the government estimates that its water reserves have been reduced precariously. According to the survey from the Ministry of Water Resources, millions of Iraqi people have faced a severe shortage of drinking water. Since of the importance of water for human life and the need to monitor temporal and spatial changes in quality and quantity, there is a need to develop a general Iraqi Water Quality Index (Iraq WQI) to monitor surface water and groundwater and classify it into five categories, very good, good, acceptable, bad and very bad, in terms of suitability for domestics, irrigation and agriculture depending on the Iraqi and WHO standards for drinking water. In addition, strict establishment for the regular quantitative monitoring surface water and groundwater setting and processes. Prospects are more negative for all riparian countries. This implies that solving these problems requires actual and serious international, regional, and national cooperation to set a prudent plan for water resources management of the two basins. Iraq being the most affected country should seriously set a prudent, scientific, and strategic plan for the management and conservation of its water resources. ; Validerad;2020;Nivå 1;2020-11-18 (johcin)

This PhD thesis seeks to contribute towards closing a research gap in the knowledge about the African Union Mission in Somalia (AMISOM) as an African Union (AU) and United Nations (UN) authorised peace enforcement operation. In so doing, the study covers the period 2007-2017 and attempts to fulfil three broad objectives. Firstly, it examines the implementation of AMISOM mandate amidst foreign interventions and their underlying implications for the strategic AU-UN partnership. Secondly, the thesis attempts to examine any significant changes towards the implementation of the mandate by assessing the evolution of AMISOM's decade-long presence in Somalia. The analysis focuses on whether AMISOM has morphed into an exercise in self-interest or still pursuing the shared strategic objectives for which it was established. Thirdly, the study confronts the theoretical idea imposed by Western ideologies to export liberal democracy through peacekeeping operations, especially as it relates to regional peace operations. In a sense, it contrasts between liberalism and realism vis-à-vis peacekeeping operations in order to account for the case of AMISOM given the involvement of frontline states whose realist strategy in Somalia has presented a major dilemma. Given the latitude, the study adopts an interdisciplinary and mixed methodology approach in its analysis of foreign interventions and the pursuit of illicit commercial interests in a conflict economy milieu marked by attempts to counter al-Shabaab in Somalia. As a qualitative research, the study relies on primary and secondary data sources including relevant articles and journals, although aspects of quantitative method have also been used where appropriate. ; Esta tese de doutoramento visa contribuir para o preenchimento de uma lacuna de pesquisa no conhecimento sobre a Missão da União Africana na Somália (AMISOM), como uma operação de imposição da paz autorizada pela União Africana (UA) e endossada pelas Nações Unidas (ONU). O âmbito do estudo abrange o período 2007- 2017 e ambiciona cumprir três objetivos principais. Em primeiro lugar, examina a implementação do mandato da AMISOM no meio de intervenções estrangeiras e as suas implicações subjacentes para a parceria estratégica UA-ONU. Em segundo lugar, a tese tenta examinar quaisquer mudanças significativas em relação à implementação do mandato, avaliando a evolução da AMISOM após uma década de presença na Somália. A análise concentra-se em determinar se a AMISOM se transformou num exercício em interesse próprio ou se ainda persegue os objetivos estratégicos comuns para os quais foi estabelecida. Em terceiro lugar, o estudo confronta a ideia teórica imposta pelas ideologias ocidentais para exportar a democracia liberal por meio de operações de manutenção da paz, especialmente no que se refere as operações de paz regionais. Em certo sentido, contrasta entre liberalismo e realismo face às operações de manutenção da paz com vista a contextualizar o caso da AMISOM, dado o envolvimento dos Estados da linha da frente, cuja estratégia realista na Somália apresentou um grande dilema. Dada a latitude, o estudo adopta uma abordagem metodológica interdisciplinar e mista, na análise de intervenções estrangeiras e a prossecução de interesses comerciais ilícitos, num ambiente de economia de guerra marcado por tentativas de conter o "al-Shabaab" na Somália. Tratando-se de uma pesquisa qualitativa, o estudo baseia-se principalmente em fontes primárias e secundárias, incluindo artigos e periódicos relevantes, embora alguns aspectos do método quantitativo tenham sido também aplicados.