7 research outputs found

    Annales Universitatis Scientiarum Budapestinensis de Rolando Eötvös Nominatae. Sectio Geologica XI

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    Kondrat´ev, K.: Â Meteorologičeskie issledovaniâ na pilotiruemyh kosmičeskih korablâh Márton P.: The problem of magnetic stability in the light of thermomagnetic research Meskó A.: Gravity interpretation and information theory III. The method of second derivates Šalat, P. S.: Prâmoj metod interpretacii mnogoslojnyh grafikov kažuŝegosâ soprotivleniâ ϱk (r), polučennyh nad gorizontal'no-sloistoj stukturoj s vêz Szemerédy P.: Role of the homogeneous magnetisation of rock samples in rock-generator measurement Balkay B. - Stegena L.: Some geophysical and geological aspects of crustal structure evolution in the Hungarian Basin Árkai P.: Correlation of quantitative petrographic characteristics of pyroxene andesites in the volcanic complex of the southwestern Cserhát Hills Vadász, E.: Notice historique sur les vestiges végétaux des tufs basaltiques des alentours de Gleihenberg Géczy B.: Deformed Jurassic Ammonoids from Úrkút (Bakony Mountains, Transdanubia) Kenawy, A. I.: Planctonic Foraminifera from the Oligocene and Lower Miocene of Hungar

    CONDITIONED DEVOICING OF MEDIAE IN PHRYGIAN

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    CONDITIONED DEVOICING OF MEDIAE IN PHRYGIA

    Environmental analysis of modern speleothems from Sterkfontein Caves and its implications for reconstructing palaeoenvironments

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    A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science. Johannesburg, 2017During the Plio-Pleistocene, the Earth experienced a period of gradual cooling, leading to a decrease in atmospheric temperature and increased seasonality. This resulted in the aridification of large parts of Africa, and this is believed to have encouraged human evolution and innovation. Palaeoenvironmental analyses using sediment deposits as palaeoclimate proxies in the Cradle of Humankind have been used to understand the timing and intensity of this aridification by determining how changes in environmental conditions and seasonal cycles affected the South African landscape. These changes are recorded within the carbon and oxygen isotopic signatures of speleothems, which have precipitated within the Sterkfontein Caves system. The aim of this study is to understand the degree to which modern speleothems represent the modern climate and environment, and thereby deduce the reliability of speleothem deposits in the Sterkfontein Caves system as palaeoclimate proxies. Samples of modern speleothems were collected from different chambers of the Sterkfontein Caves, along with the collection of modern drip water samples bi-weekly over a period of 14 months. Oxygen and carbon stable light isotope analyses of these modern speleothem and drip water samples were used to obtain modern temperature, precipitation and vegetation data. These data were then compared to modern climatic and environmental records for atmospheric temperatures and precipitation from weather stations around the Sterkfontein Caves area. The δ13C trends produced from the modern speleothem samples reflected the current vegetation distribution in terms of C4 and C3 vegetation very well, while the temperatures calculated from the δ18O values of the modern speleothem and drip water samples displayed variations related to kinetic fractionation effects, rendering these data less useful in reflecting the current atmospheric temperatures. The δ18O values of the drip water samples, along with the measured drip rate reflected current precipitation seasonality, taking into account groundwater residence time and recharge rate. The conditions within the cave conducive to formation of the speleothems was well reflected by the pH and electro-conductivity values produced from the drip water samples. These values also provided further insight into the exterior climatic conditions. Overall, the carbon and oxygen stable light isotope data revealed patterns present in the modern speleothem and drip water samples, which could be further related to changes in local climate during the precipitation of these modern speleothems from drip water sources. This, to a certain degree, provides evidence of the reliability of speleothems in the Sterkfontein Caves system as suitable palaeoclimate proxies with regards to vegetation and precipitation interpretations, over a longer term scale and at higher sampling resolution.MT 201

    Liquid footprints : water, urbanism, and sustainability in Roman Ostia

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    The present study explores the role of water in the ancient Roman city of Ostia.In antiquity, Ostia was situated at the intersection of the Tiber River and the Mediterranean Sea, and acted as one of the harbour cities of Rome for several centuries.This study investigates how water was acquired, used, and drained away in Ostia, and how these systems changed over time. To achieve a high level of resolution, three city blocks (insulae), were selected as case studies: III, i; IV, ii; and V, ii.to contextualize these hydraulic systems, the present study developed a new methodology, the Roman Water Footprint. The method was inspired by 21st century ways of understanding how and why water is used in modern cities. These modern insights have indicated that sustainable water usage is based not only on advanced hydraulic technology, but also includes environmental factors, and a strong cultural factor.The results of the study indicate that Roman water usage was much more diverse and flexible than has been previously appreciated.By placing Roman water systems into dialogue with the methodologies of modern sustainable water research, this study forms an initial bridge between modern and ancient approaches to water and urbanism.Classical & Mediterranean Archaeolog
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