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1.
CVD Growth of Molybdenum Diselenide Surface Structures with Tailored Morphology
M. Naeem Sial, Usman Muhammad, Binjie Zheng, Yanan Yu, Andraž Mavrič, Fangzhu Qing, Matjaž Valant, Zhiming M. Wang, 2018, original scientific article

Abstract: Controllable atmospheric pressure CVD has been optimized to grow transition metal dichalcogenide MoSe2 with tunable morphology at 750 °C on a silicon substrate with a native oxide layer of 250 nm. Utilizing tetrapotassium perylene-3,4,9,10-tetracarboxylate (PTAS) as a seed promoter and varying the vertical distance between the substrate and the precursor MoO3, different morphologies of MoSe2 were achieved, including 2D triangles, hexagons, 3D pyramids and vertically aligned MoSe2 sheets. We find that the shape of MoSe2 is highly dependent upon the distance h between the substrate and the precursor. The change in the morphology is attributed to the confinement of vapor (MoO3 and Se) precursors and their concentrations due to the change in h. These results are helpful in improving our understanding about the factors which influence the morphology (shape evolution) and also the continuous growth of MoSe2 films.
Keywords: Transition metal dichalcogenides, 2D materials, Seed promotor, Chemical vapor deposition, Molybdenum diselenide
Published in RUNG: 20.08.2018; Views: 3695; Downloads: 14
.pdf Full text (2,68 MB)

2.
RE-CONCEPTUALIZATION OF THE CONSERVATION THEORY FOR THE MANAGEMENT OF ARCHAEOLOGICAL HERITAGE
Usman Ali, 2017, doctoral dissertation

Abstract: ver the last few decades, the concept of “authenticity” has commonly been used as a criterion for heritage conservation and management in various regions around the world. In 1994, ICOMOS adopted the Nara document on Authenticity as an international recommendation to draw the attention of policy and decision makers on the values of cultural heritage, stressing on interdisciplinary of approaches. Interdisciplinary research of heritage studies includes analysis and evaluation methods to redefine the theories and methodologies of heritage preservation and management in different contexts. But, when dealing with Archaeological Heritage Management, various difficulties emerge in the adoption of prescribed criteria for heritage conservation and management. The aim of this research is to examine and evaluate the compatibility and potential adaptation of these significant criteria from the Heritage International practice (I.e. UNESCO), including the spheres of law and philosophy, in the Management of Archaeological Heritage. Consequently, this dissertation is articulating according to the following concepts: 1. UNESCO already prescribed parameters and criteria of conservation and management of cultural heritage, but their full applicability on Archaeological Heritage Management should be verified; 2. The level of similarities and differences between Cultural and Archaeological Heritage in the conservation and management process should be discussed to highlight potential new research channels; 3. Is the adoption of the concept of Authenticity as a criterion, prescribed in UNESCO Operational Guideline, compatible enough to be applied to the Management of Archaeological Heritage or not? 4. Archaeological practice as a source of information provides various data and parameters. Are these attributions determining the management? This dissertation concludes that thematic divisions of heritage studies foster and formulate various models and concepts (implicitly and explicitly), which determine many substantial criteria and integrated factors for the sustainability of archaeological heritage. These criteria and factors give 7 importance to the common theoretical and methodological research in archaeological heritage conservation theory and practice.
Keywords: World Heritage Studies, Archaeological Heritage Management, Authenticity, Heritage Conservation, Archaeological Theories, Heritage International Doctrine.
Published in RUNG: 22.06.2017; Views: 5096; Downloads: 1496
.pdf Full text (2,37 MB)

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