Mustafa Megahed

The mechanical properties in laser-based powder bed fusion (PBF-LB/M) manufactured parts are anisotropic in nature due to the layer-wise build-up but also change due to different solidification conditions in dependence on the process strategy and the geometry. In this work, the latter effect is examined by means of simulating the thermal history on a part scale (macro temperature) and correlating the critical temperature and holding time with the local hardness and microstructure. A macro temperature model is introduced and validated with vector-based thermal simulations and thermo couple measurements from the build-up process. Two cone-shaped geometries are investigated, namely, an upright and an inverted cone. The examinations are performed and validated with Inconel 718. An outlook to further investigations and more complex, real-life applicable geometries is given.

Literature Review or reviewing intellectual production on the subject of institutional repositories of Electronic theses and dissertations (ETDs) is an attempt to identify, define and compile completed research reports, articles of scientific periodicals, books, theses and other materials on specific aspects of the topic. During the last twenty years during which the topic of our current study began to emerge and grow, surrounding what has been written and published on the topic of our research helps to gain familiarity with it, proposes new approaches to planning the study and helps us develop a stronger understanding of theoretical implications, in order to benefit from those theses and scientific papers and make bibliographic control on them And access to and benefit from its contents, so it does not remain confined to the drawers and shelves, and enables the community to maximize its returns and activate its results. The study aims to gain familiarity and knowledge of what has been published from sources and references in this field, to help Egyptian libraries and other academic institutions in planning to build and develop an institutional repository for their university theses production in view of the urgent necessity and urgent need it represents, answering most questions and posing all the problems and challenges that Confront these institutions when initiating and thinking about starting or planning to build such a project.

Maintaining a library of essential digital elements requires preserving metadata about those resources, and metadata is extremely necessary for the successful management of any digital entity, and digital resources are more comprehensive and differ from the metadata used to manage print business collections and other physical materials. Institutions create metadata standards or metadata schemes for the purpose of organizing and managing their digital collections and resources of theses and digital presentations that are interoperable, and compatible with their needs, and the distinctive characteristics of their digital resources from electronic theses and dissertations, and in this study we present what is metadata, interoperability of all kinds The various digital theses and dissertations standard, with the metadata standard for the interoperability of theses and e-theses, standards for metadata collection, metadata tables and methods for their implementation, and we stamp with text, image and video file formats, and other formats used in electronic theses and dissertations.