542 research outputs found
The Δρομοδείχτης της Ελλάδος of 1824 and Athanasios Stageirites (Τίτλος περίληψης)
No full textσ. [281]-290Κείμενο στα ελληνικά με περίληψη στα αγγλικά με τον τίτλο: The Δρομοδείχτης της Ελλάδος of 1824 and Athanasios StageiritesThe article first examines the close relationship between the publication “Δρομοδείχτης της Ελλάδος” [1824] and the publication “Ηπειρωτικά” (1819) by Athanasios Stageirites and then suggests that Athanasios Stageirites is the likeliest author of the “Δρομοδείχτης της Ελλάδος”.Δωδώνη: Τεύχος Πρώτο: επιστημονική επετηρίδα του Τμήματος Ιστορίας και Αρχαιολογίας της Φιλοσοφικής Σχολής του Πανεπιστημίου Ιωαννίνων; Τόμ. 43-44 (2014-2015
Dataset in support of the Southampton doctoral thesis 'The boatbuilding tradition of the Aegean during the Late Neolithic – Early Bronze Age periods. Typological classification, digital reconstruction and seakeeping assessment'
No full textDataset in support of the Southampton doctoral thesis 'The boatbuilding tradition of the Aegean during the Late Neolithic – Early Bronze Age periods. Typological classification, digital reconstruction and seakeeping assessment' Appendix D - Resistance data and Appendix C - Stability data.
This dataset is focused on two appendices:
Appendix D - Resistance data. D.1 Resistance data produced by the author via MAXSURF Resistance for this thesis.
Appendix C - Stability data
C1. Stability data – STIX and ISO criteria, produced by the author via MAXSURF Stability software for his thesis
This research was funded by Southampton Marine and Maritime Institute (SMMI), Vice-Chancellor's Scholarship, Greek Archaeological Committee UK (GACUK)
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Chromite Grain Diameter (CGD) from the ore-hosting dunite of the Xerolivado-Skoumtsa chrome mine (Vourinos,Western Macedonia, Greece): implications for chrome ore exploration
No full textThe largest chrome-ore bearing dunite of the Vourinos Complex occurs within the Xerolivado-Skoumtsa Mine District. The host dunite body has a surface exposure of 3 km2 and extends at least 400m into the subsurface.
The dunite body is hosted by harzburgite tectonite interfolded with the dunite body during ductile phases of deformation.
The Xerolivado-Skoumtsa mine is one of the world’s largest ophiolite-hosted chrome deposits with a potential of 6 million tons of ore assaying at 22 wt.% Cr2O3. Even so, chrome ore bodies compose less than 1% of the volume of the dunite body. Exploration consisted chiefly of expensive drilling programs.
A well-documented suite of chrome ores from the south sector of the mine were collected during the final years of its operation (1987-1988). Samples include twenty-seven (27) samples of serpentinite altered from primary olivine that originally coexisted with the chromite. Two types of serpentinised dunite were distinguished: Type A samples are from serpentinised dunite 1m from the ore bodies, and Type B samples are silicates infolded with the ores during original high-temperature mantle deformation.
Thin-polished sections were studied via optical microscopes (transmitted and reflected light). All chromite grains (2,776 total measurements) were photographed and measured in eight directions at angular resolution of 22.5o, starting from the maximum diameter. The average and median chromite grain diameter (CGD) was calculated for each sample.
These geometric analyses indicate that CGD decreases depending on the position (Type A or Type B) of the samples: the average and the median of the CGD were smaller in the serpentinites next to the chromite ore bodies (Type A) than those within consecutive chromite ore bodies (Type B).
A decrease of the average and median CGD was found in (today’s) vertical ore dimension: samples from mine level 717m have larger average and median CGD than samples from over-lying mine level 738m and from the underlying mine level 692m. This concurs with the position of the thickest size of the ore bodies, decreasing towards the overlying levels and underlying levels.
The grain size of chromite in these dunites is due to a combination processes of original Cr-spinel crystallization and grain break-up and deformation concurrent to original dunite thinning around the ore layers. With the lack of preserved olivine morphology, these structures are the only “fingerprints” of the type of deformation undergone on grain scale. These results could provide a “petrographic tool” useful for the exploration of schlieren-type chrome ores: host dunite (serpentinite) samples present lower average and median CGD when they are found closer to the ore bodies. Future research on this subject should focus on the verification of the results in other similar ore-hosting dunites and mineralogical and/or metallogenetic interpretation of the numeric results
Mineral Surface Science and Nanogeoscience: The Case of Mineral Nanoparticles, Nanominerals and Natural Nanoporous Oxide Materials
No full textInvestigation of Trace and Critical Elements (Including Actinides) in Flotation Sulphide Concentrates of Kassandra Mines (Chalkidiki, Greece)
No full textPyrite/arsenopyrite (Py-AsPy), galena (PbS), and sphalerite (ZnS) concentrates from the flotation plants of Olympias and Stratoni (Kassandra mines, Chalkidiki, N. Greece) were investigated for their major, trace, minor, and critical element contents, including actinides associated to natural radioactivity. It is revealed that in addition to the Pb, Zn, Ag, and Au being exploited by Hellas Gold S.A., there are also significant concentrations of Sb and Ga (Sb: >0.2 wt.% in PbS concentrate; Ga:25 ppm in ZnS concentrate), but no considerable contents of Bi, Co, V, or REE. Concerning other elements, As was found in elevated concentrations (>1 wt.% in Py-(As)Py-AsPy Olympias concentrate and almost 1 wt.% in Stratoni PbS and ZnS concentrates) together with Cd (specifically in ZnS concentrate). However, actinides occurred in very low concentrations (U < 2 ppm and Th < 0.5 ppm in all examined concentrates), limiting the possibility of natural radioactivity in the Hellas Gold S.A. products. The concentrations of the natural radionuclides (238U, 232Th, and 40K) are much lower than those of commercial granitic rocks, and thus the associated radioactive dose is insignificant
SYNTHESIS AND STUDY OF COMPLEX COMPOUNDS SUPPORTED ON NATURAL ZEOLITES
No full textTRANSITION METAL COMPLEX COMPOUNDS SUPPORTED ON NATURAL ZEOLITE CRYSTALS (OF THE HEU - TYPE/HEULANDITE) WERE SYNTHESIZED AND CHARACTERIZED. THE STUDY INCLUDED CU - AND CO - COMPLEXES WITH DIETHYLDITHIOCARBAMATE LIGANDS AS WELL AS NI - COMPLEXES WITH PYRIDINE. THE SYNTHESIS WAS ACHIEVED BY MEANS OF GRADUAL CHEMICAL MODIFICATIONS OF THE INITIAL (RAW) ZEOLITE CRYSTALS. IN THE CASE OF CU AND CO, SURFACE COMPLEXES "ANCHORED" ONTO THE ZEOLITE WERE IDENTIFIED. IN THECASE OF NI, BOTH INTRAZEOLITE AND SURFACE COMPLEXES WERE DEFECTED USING IN -SITU SPECTROSCOPIC TECHNIQUES. THE RESULTS OF THIS STUDY COULD LEAD TO THE DEVELOPMENT OF NEW MATERIALS AND CONTRIBUTE TO THE SOLUTION OF PROBLEMS RELATED TO THE GEOCHEMISTRY OF THE MICROPOROUS ALUMINOSILICATE MINERALS.ΣΥΜΠΛΟΚΕΣ ΕΝΩΣΕΙΣ ΜΕΤΑΒΑΤΙΚΩΝ ΣΤΟΙΧΕΙΩΝ ΚΑΘΗΛΩΜΕΝΕΣ ΣΕ ΚΡΥΣΤΑΛΛΟΥΣ ΦΥΣΙΚΟΥ ΖΕΟΛΙΘΟΥ (ΤΥΠΟΥ - HEU/ΧΙΟΥΛΑΝΔΙΤΗ) ΣΥΝΤΕΘΗΚΑΝ ΚΑΙ ΧΑΡΑΚΤΗΡΙΣΘΗΚΑΝ. Η ΜΕΛΕΤΗ ΠΕΡΙΕΛΑΒΕ ΣΥΜΠΛΟΚΑ CU ΚΑΙ CO ΜΕ ΔΙΑΙΘΥΛΟΔΙΘΕΙΟΚΑΡΒΑΜΙΔΙΚΑ LIGANDS ΚΑΘΩΣ ΚΑΙ ΣΥΜΠΛΟΚΑ NI ΜΕ ΠΥΡΙΔΙΝΗ. Η ΣΥΝΘΕΣΗ ΕΠΙΤΕΥΧΘΗΚΕ ΜΕΣΩ ΣΤΑΔΙΑΚΩΝ ΧΗΜΙΚΩΝ ΤΡΟΠΟΠΟΙΗΣΕΩΝ ΤΩΝ ΑΡΧΙΚΩΝ (ΑΥΤΟΥΣΙΩΝ) ΖΕΟΛΙΘΙΚΩΝ ΚΡΥΣΤΑΛΛΩΝ. ΣΤΗΝ ΠΕΡΙΠΤΩΣΗ ΤΟΥ CU ΚΑΙ ΤΟΥ CO ΕΞΑΚΡΙΒΩΘΗΚΑΝ ΣΥΜΠΛΟΚΑ "ΑΓΚΥΡΩΜΕΝΑ" ΣΤΗΝ ΕΠΙΦΑΝΕΙΑ ΤΟΥ ΖΕΟΛΙΘΟΥ. ΣΤΗΝ ΠΕΡΙΠΤΩΣΗΤΩΝ NI, ΕΝΤΟΠΙΣΘΗΚΑΝ ΤΟΣΟ ΕΝΔΟΖΕΟΛΙΘΙΚΑ ΟΣΟ ΚΑΙ ΣΥΜΠΛΟΚΑ ΕΠΙΦΑΝΕΙΑΣ ΧΡΗΣΙΜΟΠΟΙΩΝΤΑΣ IN - SITU ΦΑΣΜΑΤΟΣΚΟΠΙΚΕΣ ΤΕΧΝΙΚΕΣ. ΤΑ ΑΠΟΤΕΛΕΣΜΑΤΑ ΤΗΣ ΕΡΕΥΝΑΣ ΑΥΤΗΣ ΘΑ ΜΠΟΡΟΥΣΑΝ ΝΑ ΣΥΜΒΑΛΛΟΥΝ ΣΤΗΝ ΑΝΤΙΠΤΥΞΗ ΝΕΩΝ ΥΛΙΚΩΝ ΚΑΙ ΝΑ ΣΥΝΕΙΣΦΕΡΟΥΝ ΣΤΗΝΕΠΙΛΥΣΗ ΠΡΟΒΛΗΜΑΤΩΝ ΠΟΥ ΣΧΕΤΙΖΟΝΤΑΙ ΜΕ ΤΗΝ ΓΕΩΧΗΜΕΙΑ ΤΩΝ ΜΙΚΡΟΠΟΡΩΔΩΝ ΑΡΓΙΛΟΠΥΡΙΤΙΚΩΝ ΟΡΥΚΤΩΝ
Mineral Surface Science and Nanogeoscience
No full textIn the last decades technological developments have revitalized a new area of research in Mineralogy with respect of the structure and reactivity of mineral surfaces. Mineral Surface Science is closely associated to the fields of Molecular Geochemistry and Biogeochemistry, concerning the investigation of geochemical processes at the molecular level. The expansion of both scientific subjects is based on the combined utilization of advanced microscopic and -surface- spectroscopic techniques, such as AFM, STM, TEM, SIMS, LIBS, and XPS. Nowadays, it is possible to study, by means of in situ AFM, crystal growth and dissolution processes occurring at mineral-fluid interfaces, in real time, also on a molecular scale (nanoscale). Moreover, accelerator-/Synchrotron-based techniques, including PIXE, NRRA, RBS, SR-(µ)XRF, SR-(µ)XRD and (µ)XANES/EXAFS, present new opportunities for Nanogeoscience and, in general, to Earth and Environmental Sciences. Mineral Surface Science and molecular Geochemistry have contributed to the establishment of Nanogeoscience with regard to the study of nanoparticles in nature and the investigation of geological processes in the nanoscale (1 nm–100 nm). As an example, a part of the research currently elaborated concerns the surface chemical behavior of calcite. This common carbonate mineral plays a major role in the global CO2 cycle, participates in key biomineralization processes, and shows high reactivity in fluids controlling the geoavailability and bioavailability of certain contaminants. On the other hand, nanoporous minerals, such as zeolites, clays, and Fe-Mn-oxides/oxyhydroxides, are important natural materials when studying the Earth and developing relevant Environmental Technology. Additionally, Mineral Surface Science and Nanogeoscience are crucial in ore systems research. This Special Issue focuses on recent advances in Mineral Surface Science and Nanogeoscience, including, but not limited to, topics such as crystal growth; mineral dissolution; nanominerals; mineral nanoparticles; nanoporous minerals; nanoscale ore mineralogy; environmental mineralogy; environmental nanoparticles; atmospheric particles; biominerals; medical mineralogy; nanofossils; and nanoscopic methods
Peak power reduction algorithms in asymmetric digital subscriber line modems
No full textThesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.Includes bibliographical references (leaves 94-96).This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.This thesis investigates peak-to-average ratio (PAR) reduction techniques for multicarrier modulation systems, such as discrete multitone (DMT) modems and orthogonal frequency-division multiplexed (OFDM) terrestrial broadcast transmitters. Through simulation and test implementation on a state-of-the-art programmable ADSL development platform, this thesis pursues a suitable solution for minimizing PAR given the resources of a programmable platform. This solution is integrated as a prototype implementation into a fully-functional ADSL modem and optimized for maximum PAR reduction performance within modem complexity constraints.by Athanasios Dimitri Dousis.M.Eng
Dissolution, sorption/(re)precipitation, formation of solid solutions and crystal growth phenomena on mineral surfaces
No full textHomophobic Statements, a Bishop, and the Limits of Freedom of Expression. An In-Depth Commentary on ECtHR 31.08.2023, Amvrosios-Athanasios Lenis v. Greece, no. 47833/20
No full textDichiarazioni omofobe, un vescovo e i limiti della libertà di espressione. Un commento approfondito su CEDU 31.08.2023, Amvrosios-Athanasios Lenis v. Greece, no. 47833/20.
ABSTRACT: The decision of the ECtHR of 31.08.2023, Amvrosios-Athanasios Lenis v. Greece (no. 47833/20), is a further step toward an increasingly dense jurisprudence on “hate speech” and the limits of freedom of expression. The public proclamation of religious doctrines that are in conflict with the values of the contracting States enshrined in the ECHR is protected to a certain extent by the fundamental right of freedom of religion and belief. However, the qualification of a statement as religious does not justify “hate speech.” The AUTHOR shows the tension between freedom of religion, freedom of expression, and protection against discrimination, and analyzes the decision against the backdrop of Article 17 of the ECHR (prohibition of abuse of rights).
SOMMARIO: 1. Preliminary Remarks - 2. The Concept of Hate Speech - 3. The Facts of the Case - 4. The Procedure and Reasoning of the Court - 4.1 The ECtHR’s Preliminary Considerations on Fundamental Rights - 4.2 Legal assessment - 4.3 Some Remarks on (the Non-Invoked) Article 9 of the ECHR - 5. Concluding Remarks
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