University Ecclesiastical Academy of Thessaloniki

A first beam dynamics and RF design of an Alvarez-type drift tube linac (DTL) has been defined in the framework of the EU project, HITRIplus. It is meant primarily as a carbon (12C4+) and helium (4He2+) ion injector of a compact synchrotron for patient treatment. As a second implementation, helium particle acceleration with a higher duty cycle (10%) enables radioisotope production. The 352.2 MHz structure efficiently accelerates ion species with A/q=3 and 2, in the energy range from 1 to 5 MeV/u and for a beam current up to ∼0.5 mA. The design extends to a full length of ∼6.4 meters. Permanent magnet quadrupoles are utilized all along the DTL for focusing both ion beams. This paper presents a first-phase analysis towards a realistic DTL design capable of providing full beam transmission and minimum overall emittance increase for both A/q values.

Analogia 17 (2023)

Abstract Non‐indigenous species (NIS) are spreading and reshaping Mediterranean Sea biological communities and fishery resources. The present study used fisheries data and structured interviews to assess the impacts of NIS on recreational and commercial fishers in Cyprus. NIS that have been present in Cyprus for more than two decades were mostly perceived by local fishers as native, NIS with high market value were considered to be beneficial, and venomous or poisonous NIS were considered to be deleterious. Pufferfishes (Tetraodontidae) were identified by fishers as causing significant economic damage, which undermines the sustainability of the commercial fishing sector. The most popular and highly priced NIS were rabbitfishes (Siganus spp.). In terms of commercial landings, six non‐indigenous taxa contributed over a quarter of the total landing value and more than half during the summer season. The results of the present study emphasised the multifaceted interactions of NIS with the fishing sector, and how policy objectives may not align with social and commercial fishery interests.

In the present work, a thorough research and study was carried out to determine the conditions prevailing in the breeding and operation of the breeding units of fur animals in Greece that are bred, exclusively in the Region of Western Macedonia. Specifically, all the parameters that affect the efficiency of the breeding units were analyzed, the appropriate answers to the problems and weaknesses of the fur farming industry were evaluated and given. The work mainly concerns the practices and the situation prevailing in the industry, from a technical point of view and production process and the development perspectives through proposed strategies, which are based on findings, literature, theoretical analyses, statistical analyses and primary sources from direct personal contacts. The general conclusion that emerges from the whole effort is a dynamic development of the fur-breeding industry, since everything points in this direction and this development will contribute greatly to the improvement of the living standard of the inhabitants of the area.

Some people with cancer are already benefiting from drugs that target genetic features regardless of the tissue involved. But these early successes could be the exceptions. Some people with cancer are already benefiting from drugs that target genetic features regardless of the tissue involved. But these early successes could be the exceptions.

ABSTRACTThis study conducted a comparison between biocide treatments based on nanoparticles of silver, copper, ZnO, TiO2 and silver/ TiO2 nanocomposites to analyse their capability to inhibit microalgal fouling on stone buildings. Biofouling is one of the main alterations on stone façades, causes degradation of their constituent materials and interferes with their aesthetic values. The proposed treatments were tested on a limestone from the historic quarry of Estepa (Spain), widely used as construction material in the South of Spain. The applicability of the treatments was evaluated by colorimetry. The biocidal effectiveness of the nanoparticles was studied on stone surfaces by multispectral imaging, digital image analysis and optical coherence tomography. This is a low-cost and efficient protocol to validate biocidal treatments for limestone monuments, and our results demonstrate the potential of silver and ZnO nanoparticles as a protective treatment for stone façades. The results have implications for practitioners working on historic buildings.

The aim of this study is the characterization of a portable icon of Virgin Mary “Eleousa”, from the village of Kleidi, Northern Greece. The icon is dated in the second half of 19th century, and its stylistic features typify it as a representative example of post-Byzantine folk ecclesiastical art of Northern Greece. Micro-samples of the painting and ground layers were analyzed by means of microscopic and spectroscopic methods (optical microscopy, μ-FTIR, μ-Raman and SEM-EDS). The combination of the applied characterization methods permitted the detailed examination of the stratigraphy and the materials of the icon. The identified pigments are minium, hematite (red ochre), Prussian blue and carbon black. Egg tempera was the applied technique and the gilding was made with golden leaves applied using the water gilding technique (bole). This study belongs to a project which aims to the documentation of the materials and techniques of late post-Byzantine Northern and Central Greek artistic guilds.

The wetting properties of the surfaces of polymer films changed dramatically from the usual inherent hydrophobicity (or slight hydrophilicity) to superhydrophobicity (contact angle, CA > 150°) by embedding oxide nanoparticles into the polymer matrices. The desired hierarchical roughness at the micrometer and nanometer scale was induced in poly(methyl methacrylate), polystyrene, and four poly(alkyl siloxane) films enriched with silica, tin oxide, alumina, and zinc oxide nanoparticles, ranging from 7 to 70 nm in mean diameter. Particles were added in the polymer solutions which were afterward sprayed on various substrates, such as glass, silicon, concrete, aluminum, silk, paper, wood, marble (white), sandstone, and mortar. It is stressed that superhydrophobicity was accompanied by water repellency, as evidenced by the low contact angle hysteresis (CAH < 10°). Consequently, it is demonstrated that the simple suggested method for transforming the wetting properties of polymer films to achieve extreme nonwetting is flexible as it can be effectively applied using different materials, including polymers and nanoparticles of low cost. Moreover, the method can be easily used for the surface treatment of large and various substrates. The effects of the (1) concentration and size of the nanoparticles, (2) chemical nature of the polymer matrix, and (3) treated substrate on the wetting properties of the films were investigated and interpreted using scanning electron microscopy (SEM). Finally, it is shown that depending on the color of the underlying substrate, the superhydrophobic water-repellent polymer-nanoparticle films may have a negligible effect on the aesthetic appearance of the treated substrate.