A Comparative Study on the Compressive Strength of Bricks from Different Historical Periods

The aim of this article is to present the results of compressive strength tests for bricks from different historical periods. The studies were conducted on hand-molded and mechanically formed bricks. The bricks that were used for the studies came from historical structures from the center of the royal city of Crakow. Compressive strength was determined on rectangular prisms and on cylinders cut out from bricks in various directions—anisotropy and shape effects were then analyzed.

?The basic aim of the conducted studies was to estimate the possibility of carrying out the strength tests on relatively small samples and re-calculating these results on normalized brick strength determined according to EN772–1. Based on the tests results, a range of correlation coefficient values for cylinder samples with diameters of 30 mm and 50 mm was given. It was indicated that for the tested historical bricks characterized by significant material non-homogeneity within the element and sensitivity to damages while cutting out the samples, correlation coefficients are higher than for bricks used contemporarily.

?The results of these studies are presented alongside the findings from existing studies on the compressive strength of bricks.     

Optical dating and sedimentary record from the terrace depositional profile of the Warta River (Central Poland)

Results of OSL dating and sedimentary studies from the profile of the low alluvial terrace of the middle Warta River are presented. The samples were dated using the single-aliquot regenera-tive method. Dating was used to establish a timing of the Weichselian Late Glacial events in the river valley environment. Stable conditions on the floodplain are expressed by the deposition of organic-rich series radiocarbon dated at 12 900-12 600 cal BP and 11 600-10 770 cal BP. Samples for OSL dating were collected from the mineral material deposited during the intensification of flood events during the Weichselian decline. The results obtained for the alluvia range from 12.78 ± 0.62 ka b2k to 14.33 ± 0.74 ka b2k. Sedimentological criteria allowed to distinguish between particular flood events. Overestimation of OSL ages is probably a result of rapidity of environmental changes in that time.     

From infrastructure to digital networks: accessibility and connectivity in transport geography research at Aberdeen

ABSTRACT

This paper considers the contribution made to transport geography research at the University of Aberdeen over the last century. In section one, the earliest work in transport geography emphasised the physical connectivity provided by transport through infrastructure networks. Section 2 discusses the contribution made at Aberdeen to debates around accessibility and connectivity. This work had a strong rural dimension and evidenced a growing recognition of the importance of technology in transport. It provided the springboard for research on digital connectivity with important contributions to the wider domain of transport studies in the fields of flexible transport, rural connectivity, transport and energy and social media and big data as reported in Section 3. Section 4 brings the story of transport research at Aberdeen up to the present. It frames research under the banner of intelligent mobility (IM), which links technology and mobility to the wider societal objective of enabling the smarter, greener and more efficient movement of people and goods. Contributions are reported to the fields of shared mobility, smart rural mobility, transport security and privacy and accessibility. Finally, a return to the theme of infrastructure networks and connectivity is highlighted in work on global production networks in aviation.     

Chalcolithic settlement of Bahra 1 and its possible functions

Excavations of the Kuwaiti–Polish Archaeological Mission at the site of Bahra 1 in Kuwait uncovered the remains of a large settlement from the sixth millennium BC, associated with the Mesopotamian Ubaid culture. This connection is made clear by the presence of Ubaid Ware from the Ubaid 2/3 phase that appears alongside Red Coarse Ware typical for the Arabian Neolithic. Architecture of the settlement resembled the Ubaid one with orthogonal, multi-chambered houses. In one part of the site they form a dense block with traits that indicate some degree of spatial planning. This type of spatial arrangement is absent in Arabian Neolithic settlements and is also unknown from Ubaid settlements in Mesopotamia. One of the buildings discovered at Bahra 1 has a ground plan reminiscent of a sanctuary from Eridu XVI and was probably associated with cultic activities, as was a circular stone enclosure (Unit 6), representing local building traditions. The character of Bahra 1 architecture and the presence of cultic buildings at the site suggest that the settlements served as a local ceremonial and/or cultic centre.     

COVID-19: from temporary de-globalisation to a re-discovery of tourism?

Abstract

The processes of globalisation and time-space compression, driven mainly by the neoliberal agenda and the advancement of various space-shrinking technologies, have markedly re-shaped the world over the last 75?years in an almost unchallenged manner. Amongst the most significant outcomes of these processes have been the popularisation of international travel and the accompanying global expansion of the tourism industry. As the first major force ever to effectively stop (or even reverse) globalisation and time-space compression, the COVID-19 outbreak has also put on hold the whole travel and tourism industry. In this respect, the tourism as we knew it just a few months ago has ceased to exist. Although the price the world is paying for this is enormous, the temporary processes of de-globalisation offer the tourism industry an unprecedented opportunity for a re-boot – an unrepeatable chance to re-develop in line with the tenets of sustainability and to do away with various ‘dark sides’ of tourism’s growth such as environmental degradation, economic exploitation or overcrowding. However, the path of re-development and transformation which the global tourism production system will follow once the COVID-19 crisis has been resolved is yet to be determined.