According to scientific evidence in general, the disappearance of the Tatras tarns as a result of external geomorphological processes has been accepted since the long term analyses of lake sediments and peat bogs, geo...According to scientific evidence in general, the disappearance of the Tatras tarns as a result of external geomorphological processes has been accepted since the long term analyses of lake sediments and peat bogs, geomorphological mapping, geophysical measurements(– all indirect methods). It is paradoxical that the direct cartographic evidence of such changes has not existed until now. In this paper, we evaluate shore line changes of the small mountain glacial lake in the High Tatras-Litworowy Staw lake using a multitemporal analysis of a series of historical orthophotomaps and a historical map. Over the last 100 years, the tarn has lost 46.4% of open water level area. Significant visual changes were caused by vegetation growth of Carex species(sedges) on the water's surface. The accumulation of fine sediments and dead plant residues in the tarn basin create suitable conditions for this process, all together causing the tarn to become more shallow.展开更多
Samples of thickened waste activated sludge （TWAS） at two different concentrations were exposed to microwave radiation. Some of the samples were not allowed to heat up, to study the athermal effect of microwaves. Th...Samples of thickened waste activated sludge （TWAS） at two different concentrations were exposed to microwave radiation. Some of the samples were not allowed to heat up, to study the athermal effect of microwaves. The samples exposed to microwaves where their temperature was allowed to increase showed a higher degree of chemical oxygen demand （COD）, protein and carbohydrate solubilization compared to a control. The size distribution of particles was changed after exposure of TWAS to microwaves. These results were also observed in the samples exposed to microwaves but kept at a constant temperature, suggesting the occurrence of a microwave athermal effect. Thermally （samples experiencing a temperature increase） and athermally （samples that were maintained at ambient temperature） microwaved subsequent anaerobic biodegradation. samples produced more methane than the non-microwaved controls in展开更多
This work focuses on the development of local building materials in Benin for their efficient use in buildings. It aims to make mud bricks lightened with good mechanical, thermal and sound properties and enhance the w...This work focuses on the development of local building materials in Benin for their efficient use in buildings. It aims to make mud bricks lightened with good mechanical, thermal and sound properties and enhance the waste polystyrene. This article is the result of experimental work on a broad field of applied sciences： building mechanics. The study is focused on BTS （blocks of stabilized earth） chosen as reference materials to which we linked polystyrene. The percentage of polystyrene varies from 0% to 100% starting from a constant volume of each reference material. The results showed that the increase in polystyrene percentage lowers mechanical properties. These results also showed that the gradual addition of polystyrene to the laterite-cement mixture has a significant influence on the density and mechanical resistances of the final composite material.展开更多
基金produced under the scientific project VEGA 1/0207/17–Development and changes of mountain landscape of the Tatrasthe tarn,and to what extent the anthropogenic factors and climate change make them conditional
文摘According to scientific evidence in general, the disappearance of the Tatras tarns as a result of external geomorphological processes has been accepted since the long term analyses of lake sediments and peat bogs, geomorphological mapping, geophysical measurements(– all indirect methods). It is paradoxical that the direct cartographic evidence of such changes has not existed until now. In this paper, we evaluate shore line changes of the small mountain glacial lake in the High Tatras-Litworowy Staw lake using a multitemporal analysis of a series of historical orthophotomaps and a historical map. Over the last 100 years, the tarn has lost 46.4% of open water level area. Significant visual changes were caused by vegetation growth of Carex species(sedges) on the water's surface. The accumulation of fine sediments and dead plant residues in the tarn basin create suitable conditions for this process, all together causing the tarn to become more shallow.
文摘Samples of thickened waste activated sludge （TWAS） at two different concentrations were exposed to microwave radiation. Some of the samples were not allowed to heat up, to study the athermal effect of microwaves. The samples exposed to microwaves where their temperature was allowed to increase showed a higher degree of chemical oxygen demand （COD）, protein and carbohydrate solubilization compared to a control. The size distribution of particles was changed after exposure of TWAS to microwaves. These results were also observed in the samples exposed to microwaves but kept at a constant temperature, suggesting the occurrence of a microwave athermal effect. Thermally （samples experiencing a temperature increase） and athermally （samples that were maintained at ambient temperature） microwaved subsequent anaerobic biodegradation. samples produced more methane than the non-microwaved controls in
文摘This work focuses on the development of local building materials in Benin for their efficient use in buildings. It aims to make mud bricks lightened with good mechanical, thermal and sound properties and enhance the waste polystyrene. This article is the result of experimental work on a broad field of applied sciences： building mechanics. The study is focused on BTS （blocks of stabilized earth） chosen as reference materials to which we linked polystyrene. The percentage of polystyrene varies from 0% to 100% starting from a constant volume of each reference material. The results showed that the increase in polystyrene percentage lowers mechanical properties. These results also showed that the gradual addition of polystyrene to the laterite-cement mixture has a significant influence on the density and mechanical resistances of the final composite material.
