Flame retardancy of carbon fibre reinforced sorbitol based bioepoxy composites with phosphorus-containing additives

Carbon fibre reinforced flame-retarded bioepoxy composites were prepared from commercially available sorbitol polyglycidyl ether (SPE) cured with cycloaliphatic amine hardener. Samples containing 1, 2, and 3% phosphorus (P) were prepared using additive type flame retardants (FRs) resorcinol bis(diphenyl phosphate) (RDP), ammonium polyphosphate (APP), and their combinations. The fire performance of the composites was investigated by limiting oxygen index (LOI), UL-94 tests, and mass loss calorimetry. The effect of FRs on the glass transition temperature, and storage modulus was evaluated by dynamic mechanical analysis (DMA), while the mechanical performance was investigated by tensile, bending, and interlaminar shear measurements, as well as by Charpy impact test. In formulations containing both FRs, the presence of RDP, acting mainly in gas phase, ensured balanced gas and solid-phase mechanism leading to best overall fire performance. APP advantageously compensated the plasticizing (storage modulus and glass transition temperature decreasing) effect of RDP in combined formulations; furthermore, it led to increased tensile strength and Charpy impact energy

The environmental history of Fenékpuszta with a special attention to the climate and precipitation of the last 2000 years

This work presents the details of a multidisciplinary palaeoecological and geoarcheological study on the sedimentary sequences, including 2 undisturbed cores of the Little Balaton situated in the western part of Lake Balaton in Central Europe. The application of Quaternary palaeoecological analysis to peat and lacustrine deposits enables to identify long-term environmental changes in aquatic and terrestrial ecosystems. The principal aims were to shed light onto how former human societies and culture shaped and altered their natural environment on the one hand. Furthermore, to reconstruct the once existing environmental conditions within the framework of the natural evolution of the vegetation, soil, fauna and the catchment basin for the times preceding written historical records via the application of sedimentological, geochemical, isotope geochemical, palynological, macrobotanical, malacological and microfaunal analytical methods and approaches

Excavation along the easternmost frontier of the LBK in NE-Hungary at Apc-Berekalja I (2008–2009)

The topographical position and size of the site, the number of detected houses, the presence of the early phase make the Apc-Berekalja I settlement one of the most significant sites of the LBK in Hungary. The ongoing processing of the excavation data provided already some very important observations. The geoarchaeological results demonstrated the presence of the in situ soil of the Neolithic period and effects of floods on the settlement. The study of the chipped and ground stone material coming from the Neolithic features revealed no conspicuous changes in the lithic industry of the settlement from the pre-Notenkopf to Želiezovce phases of the LBK. Lithic raw materials came exclusively from territories to the east of the site, which is an evidence of the isolation of the LBK groups that inhabited Apc. | Földrajzi helyzete, a lelőhely mérete, a megfigyelt házak száma és a korai fázis megléte alapján Apc-Berekalja I. az egyik legjelentősebb magyarországi VK-település. Az ásatási adatok még folyamatban lévő feldolgozása során közlésre méltó eredmények születtek. A geoarcheológiai vizsgálatok kimutatták egy neolitikus korú talaj in situ meglétét, valamint a települést sújtó áradásokat. A neolitikus korú objektumokból származó pattintott és szerszámkövek a település fennállása alatt a kőipar lényegi változatlanságáról tanúskodnak a VK korai időszakától a zselízi fázisáig. A településen élők a kőnyersanyagokat kizárólag a keletre eső területekről szerezték be, ami az itt lakó csoport izoláltságát igazolja

Environmental historical analysis of the sarmatian and gepids settlement of Rákóczifalva

We present the results of the environmental historical and geoarchaeological analysis of RákóczifalvaBagiföldek and Rákóczifalva-Rokkant-földek archeological sites in Jász-Nagykun-Szolnok County.1 They were discovered in the course of several hectares of archaeological excavations related to the Roman Age and Migration Period, especially the Sarmatian and the Gepids era. A significant number of Gepids sites and finds2 were found in both the investigated areas and the wider area of the site, in the middle reach of the Tisza valley. So the geoarchaeological and environmental historical analysis of the Sarmatian and LateSarmatian and Gepids sites in Rákóczifalva can also provide a model for the settling strategy and lifestyle of the Sarmatian and Gepids communities.3 The purpose of our work is to present how geoarchaeological and environmental historical factors impacted local settling and lifestyles in the Gepids communities and Sarmatian-Late Sarmatian communities as well4 during the Roman Age and the Migration Period. In addition, to demonstrate the relationship of the Sarmatian and Gepids communities and their environment in the Rákóczifalva site compared to other Gepids5 and Sarmatian and Late Sarmatian communities in the Great Hungarian Plain.6 Based on the number of objects containing animal bones and the amount of bones found in them, we can reconstruct considerable settling in the Celtic, Sarmatian, Gepids, Avar and Arpadian periods. The number of objects from the Linear Pottery culture (Great Hungarian Plain) and the Bodrogkeresztúr culture is high; however, the number of animal bones is low. On the basis of the bones discovered, we can count on a smaller settlement during the Tiszapolgár culture, the Hunyadihalom group, the Halomíros culture, the Gava culture and during the Scythians period. In this paper, we present the results of the Sarmatian, Late Sarmatian and the Gepid findings since the largest number of animal bones (except the Avar period) turned up from these periods. Our aim was to compare the animal husbandry, meat consumption and hunting habits of the Oriental origin Sarmatians and the Germanic Gepids communities. Bone artefacts and bone anvils have been found in the archaeological material of both ethnic groups. © 2020 Akademiai Kiado Rt.. All rights reserved

Environmental Historical Analysis of the Sarmatian and Gepids Settlement of Rákóczifalva

We present the results of the environmental historical and geoarchaeological analysis of Rákóczifalva-Bagiföldek and Rákóczifalva-Rokkant-földek archeological sites in Jász-Nagykun-Szolnok County. They were discovered in the course of several hectares of archaeological excavations related to the Roman Age and Migration Period, especially the Sarmatian and the Gepids era. A significant number of Gepids sites and finds were found in both the investigated areas and the wider area of the site, in the middle reach of the Tisza valley. So the geoarchaeological and environmental historical analysis of the Sarmatian and Late-Sarmatian and Gepids sites in Rákóczifalva can also provide a model for the settling strategy and lifestyle of the Sarmatian and Gepids communities. The purpose of our work is to present how geoarchaeological and environmental historical factors impacted local settling and lifestyles in the Gepids communities and Sarmatian-Late Sarmatian communities as well during the Roman Age and the Migration Period. In addition, to demonstrate the relationship of the Sarmatian and Gepids communities and their environment in the Rákóczifalva site compared to other Gepids and Sarmatian and Late Sarmatian communities in the Great Hungarian Plain. Based on the number of objects containing animal bones and the amount of bones found in them, we can reconstruct considerable settling in the Celtic, Sarmatian, Gepids, Avar and Arpadian periods. The number of objects from the Linear Pottery culture (Great Hungarian Plain) and the Bodrogkeresztúr culture is high; however, the number of animal bones is low. On the basis of the bones discovered, we can count on a smaller settlement during the Tiszapolgár culture, the Hunyadihalom group, the Halomíros culture, the Gava culture and during the Scythians period. In this paper, we present the results of the Sarmatian, Late Sarmatian and the Gepid findings since the largest number of animal bones (except the Avar period) turned up from these periods. Our aim was to compare the animal husbandry, meat consumption and hunting habits of the Oriental origin Sarmatians and the Germanic Gepids communities. Bone artefacts and bone anvils have been found in the archaeological material of both ethnic groups