36 research outputs found
Investigation of tokamak solid divertor target options
Exam paper (Special) for second semester 2016 : B.Ed. (Senior and FET Phase
Water erosion and supply of material for fluvial transport under episodic surface flow conditions in the semi-arid zone on Boa Vista (Cabo Verde)
This paper presents the effects of the natural conditions of the semi-arid zone on the tem-poral and spatial variability of production and supply of material for fluvial transport under conditions of episodic surface flow. Based on measurements of water runoff, concentration of suspension and dissolved material in the course of a one-hour rainfall, it has been determined that the catchments under study have a considerable resistance to the effects of water erosion. Some protection is supplied by the ablation pavement, which reduces rainsplash and slopewash and prevents flow concentration. Consid-erably more erosion has been noted on unpaved roads concentrating water flow even on plateaux and gently inclined slopes. Obviously the potential for leaching rock material in short-duration flow is limited. Large proportions of the dissolved material carried away from the catchments are salts of marine and aeolian provenance. The high intensity of erosional processes in the early phase of runoff is evidence of the role of physical weathering between rainfalls, which supplies the material for fluvial transport
The Effective Thermal Conductivity of a Bed of 1.2-mm-diam Lithium Zirconate Spheres in Helium
electronic reprint Structural Science Editor: Structure of N 6 -furfurylaminopurine (kinetin) dihydrogenphosphate Structural Science Structure of N 6 -furfurylaminopurine (kinetin) dihy- drogenphosphate
Record of fluvial and biogenic sedimentation processes in sediments of the Lower Vistula Valley floor
W artykule przedstawiono przegl膮d osad贸w powodziowych i biogenicznych zdeponowanych w dnie Doliny Dolnej Wis艂y od okolic G贸rska, w 艣rodkowej cz臋艣ci Kotliny Toru艅skiej, po okolice Grudzi膮dza. Om贸wiono piaszczyste osady powodziowe, osady basen贸w popowodziowych i mineralne osady jeziorzysk dolinnych. Dokonano analizy podstawowych w艂asno艣ci utwor贸w biogenicznych i ich interpretacji genetycznej. Om贸wiono te偶 wyniki bada艅 nad rekonstrukcj膮 uk艂adu koryta Wis艂y w ci膮gu ostatnich 200 lat w Kotlinie Grudzi膮dzkiej i Basenie Unis艂awskim oraz problem powolnego zamulania starorzeczy powsta艂ych przed regulacj膮 i po regulacji hydrotechnicznej w ko艅cu XIX w. Wyja艣niono kwesti臋 gradientu zawarto艣ci w臋glanowej materii rozpuszczonej w dnie doliny i jego wp艂yw na sedymentacj臋 osad贸w. Zwr贸cono uwag臋 na podobie艅stwa i r贸偶nice w transporcie materii rozpuszczonej i zawieszonej mi臋dzy korytem Wis艂y i starorzeczami na przyk艂adzie starorzecza Starej Wis艂y i koryta Wis艂y w Bratwinie.The paper is a review of flood and biogenic sediments which have been deposited on the Lower Vistula Valley floor from the vicinity of G贸rsk to Grudzi膮dz town. Sandy flood sediments, flood basin sediments and mineral infillings of former back swamps are described. Biogenic sediments are also discussed and genetically interpreted. The results of the Vistula channel reconstruction in Grudzi膮dz Basin and Unis艂aw Basin in the last 200 years are also presented. The reconstruction is strongly linked with the problem of relatively slow siltation of oxbows after the hydrotechnical regulation at the end of XIX-th century. The question of the carbonates gradient in floodplain sediments is also explained. The differences and similarities of the dissolved and suspended matter transport between the main channel and fluvial lake is shown on the example of the oxbow lake and Vistula river channel in Bratwin