The use of low cost and ecofriendly adsorbent has been investigated as an alternative to the current expensive method of removing dyes from wastewater. Cow dung cakes were collected from the nearby village which was burnt in a muffle furnace at 500℃ to obtain the required ash. This paper deals with the removal of Reactive Blue 221, Acidoll Yellow 2GNL and Olive BGL which are mainly used in textile industry, from aqueous solution by cow dung ash without any pretreatment. The adsorption was achieved under different pH, adsorbate concentration and the applicability of Langmuir and Freundlich isotherms were examined.

As it is known, during the Second World War Greece has fought on the side of theallies and the end of the war found the country on the winners’side. However, thestruggle for authority right after 1945 was merciless and extremely difficult, as well asdangerous for the course of the country to the future. The political powers were dividedbetween the legal authorities that were represented by the king and formed the exiledgovernment on the one hand and the part of the resistance teams and the rebels of the leftthat had a soviet friendly direction on the other. Thus, the start of a civil war was just a matter of time. It finally started in 1947 andlasted for more than two years. The consequences were disastrous for the country’seconomy and decisive for the future course of Greece. The national army prevailed withthe help of, mostly, the English. Royal parliamentary democracy was established with aclear political turn to the west, as a completion and adaptation of the Agreement of theGreat Powers at Yalta. Art had a ‘similar’route. Dipolar, contradictory: conservative choices on the oneside, and a will for pioneering inspiration and perspective on the other side. The‘dominate’trend was first evident in sculpture and mainly in the public monuments. Theirconstruction aimed mostly at the public propaganda and at the promotion of the sovereignideology. On the one side we have the public sculptures composed of faces of contemporaryheroes or leading figures of the civic war and the national resistance. On the other side wehave monumental statues mainly that appeal to a ‘public’outside of the country’s bordersand mostly of the north borders, where there are countries with a communistic regime, likeBulgaria, Serbia and Albania. Their subject is derived from the heroic events of the BalkanWars (1912-1913) and ancient historical figures like Alexander the Great as the Greek armyleader, his father, Philippos II and Aristotle, who was of a north-Greek origin. The political message is twofold: on the one side the ‘inner enemy’the communiststhat were defeated and the promotion of the new liberal social system and on the otherside the north neighbours, which not only represent the East Block, but they also conspire the history and the culture of the Greeks. This is the way how the ‘Cold War’was resultedin a full and totalitarian expression in art.

Electronic packaging involves interconnecting, powering, protecting, and cooling of semiconductor circuits fur the use in a variety of microelectronic applications. For microelectronic circuits, the main type of failure is thermal fatigue, owing to the different thermal expansion coefficients of semiconductor chips and packaging materials. Therefore, the search for matched coefficients of thermal expansion (CTE) of packaging materials in combination with a high thermal conductivity is the main task for developments of heat sink materials electronics, and good mechanical properties are also required. The aim of this work is to develop copper matrix composites reinforced with carbon nanofibers. The advantages of carbon nanofibers, especially the good thermal conductivity, are utlized to obtain a composite material having a thermal conductivity higher than 400 W/mK. The main challenge is to obtain a homogeneous dispersion of carbon nanofibers in copper. In this paper, a technology for obtaining a homogeneous mixture of copper and nanofibers will be presented and the microstructure and properties of consolidated samples will be discussed. In order to improve the bonding strength between copper and nanofibers, different alloying elements were added. The microstructure and the properties will be presented and the influence of interface modification will be discussed.

The type, volume fraction, size, shape and arrangement of embedded particles influence the mechanical properties of the particle reinforced metal matrix composites. This presents the investigation of the SiC particle and porosity distributions in various aluminum matrix composites produced by cold- and hot-pressing. The microstructures were characterized by optical microscopy and stereological parameters. SiC and porosity volume fractions, and the anisotropy distribution function were measured to establish the influence of the consolidation method.