Dynamic and Static Analysis and in situ Investigation of Vibro-Fundex Piles

Based on dynamic and static formulas and loading tests analysis of bearing capacity of type Vibro-Fundex driven piles is presented. The piles were embedded into noncohesive soils of various origin and degree of compaction. Using this analysis and performed investigations, the lengths of piles designed on the basis of static formulae have been corrected for safety transferring of loads into subsoil

Investigations of Settlement of Piled Raft Foundation

On the Tychy Brewery site a set of 6 tanks of the diameter varying from 5.4 m to 17 m was designed. The tanks are elements of Sewage Treatment Plant. Due to unfavourable soil conditions (plastic clay) the tanks were founded on 15 m long CFA piles with the diameter of 400 and 600 mm. In order to save construction costs piled raft foundation system was proposed. Based on the analysis and respective calculations it was assumed that raft foundations, founded of gravel fill under each tank, would bear up to 20 % to 30% of total load. The assumption allowed shortening of all piles about 3 m minimum. The loading test of 3 piles showed that approximately 80 % of total load is transferred by piles into the subsoil. In order to confirm the assumptions assumed and to measure real settlement of tanks, loading tests of all tanks were carried out by means of its gradual water filling. The comparison of the results of tank settlement measurements and respective calculations showed good agreement between calculated and measured values. The latter did not exceed permissible settlements assumed for this type of constructions and installations. In the paper soil conditions, calculations, solution of tanks foundation, field tests and results obtained are described

Traceability of raw materials in silos in an anode plant

Carbon anodes, regularly consumed in primary aluminum production, are made of calcined petroleum coke, coal tar pitch, and recycled materials. The properties of calcined coke depend on the source of crude oil and the calcination conditions. Similarly, pitch properties depend on the coal tar source and the manufacturing process. Different calcined coke and pitch mixtures are commonly used in anode manufacturing to meet various regulations and/or due to economics and availability. This makes it hard to maintain the anode quality. Calcined coke and pitch are placed in silos and used when required for production. It is hard for the industries to track the source of raw materials used in their daily recipes. This article presents an approach to trace back the details of the use of particulate raw materials with a custom-made software, which takes into account the type (mass flow or funnel flow) of silos. Such tracking can help identify the causes of problems and maintain/improve anode quality

Rolling Friction in Loose Media and its Role in Mechanics Problems

Rolling friction between particles is to be set in problems of granular material mechanics alongside with sliding friction. A classical problem of material passive lateral pressure on the retaining wall is submitted as a case in point. 3D method of discrete elements was employed for numerical analysis. Material is a universe of spherical particles with specified size distribution. Viscose-elastic properties of the material and surface friction are included, when choosing contact forces. Particles' resistance to rolling relative to other particles and to the boundary is set into the model. Kinetic patterns of medium deformations are given. It has been proved that rolling friction can significantly affect magnitude and nature of passive lateral pressure on the retaining wall

Data for: Acid-base balance disorders during kidney preservation in cold ischemia

citations associated with articl

Data for: Acid-base balance disorders during kidney preservation in cold ischemia

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Impact of the structure of the heating system on energy consumption and exploitation expenses for a building

W artykule przedstawiono analizę wpływu systemu ogrzewania na zużycie energii i koszty eksploatacyjne 3-kondygnacyjnego budynku zamieszkania zbiorowego (dom studencki) o powierzchni 2117,16 m2. Budynek miał niskie zapotrzebowanie na ciepło użytkowe do ogrzewania i wentylacji na poziomie 36,85 kWh/(m2rok). Uwzględniono 5 wariantów technologicznych systemu centralnego ogrzewania (CO) i przygotowania ciepłej wody użytkowej (CWU). Wyniki wykazały, że ogrzewanie budynku pompą ciepła może 2-6 razy zmniejszyć zapotrzebowanie budynku na energię końcową. Po uwzględnieniu cen nośników energii i kosztów amortyzacji urządzeń grzewczych rozwiązaniem najbardziej optymalnym z ekonomicznego punktu widzenia jest kocioł węglowy. Rozwiązaniem o najmniejszym zapotrzebowaniu na energię pierwotną jest kocioł na pellety drewniane.The article presents the analysis of the impact of the heating system on energy consumption and exploitation-related expenses for a 3-storey mass accommodation building (student dormitory), with an area of 2117.16 sq. m. The building had low heat requirements, shaped at the level of 36,85 kWh/sq. m/year. 5 technological variants of the central heating and water heating systems have been considered. The results have shown that heating the building with a heat pump may lead to reduction of the amount of the final energy that would be required to maintain the temperatures in the building. After the prices of energy carriers, along with the depreciation costs of the heating devices have been taken into account, it turned out that a coal powered boiler is the best solution, at least economically. The solution, in case of which the primary power requirements are the smallest is a boiler heated with the use of wooden pellets