Rubroboletus le-galiae (Boletales, Basidiomycota), a species new for Poland

Rubroboletus le-galiae is reported for the first time from Poland. Macro- and micromorphological characters of the species are described and illustrated based on the study of material collected at three microlocalities in Łężczok reserve (SW Poland). The delimitation of R. le-galiae from related species of the genus Rubroboletus (R. satans, R. rubrosanguineus, R. rhodoxanthus) is shortly discussed and the knowledge of its ecology and distribution is briefly summarized

ON THE USE OF A FLUX-SPLITTING SCHEME IN THE NUMERICAL FLUTTER ANALYSIS OF A LOW-PRESSURE TURBINE STAGE

The endeavour to increase the power output of steam turbines results in the design of low-pressure stages with large diameters. Such designs, featuring long and thin blades, are increasingly susceptible to unfavourable aeroelastic effects. The interaction of structure and flow may induce blade vibrations, known as flutter, which act detrimentally on the operational life of the machine. The present work employs a time-marching numerical simulation to investigate the flutter behaviour of a low-pressure transonic turbine cascade. Its blades are subject to a harmonic motion based on the results of a structural analysis and its susceptibility to flutter is evaluated via the energy method. The computations are performed with an in-house Finite Volume Method code. The flow model is based on 2D Euler equations in Arbitrary Lagrangian-Eulerian formulation with the AUSM+-up scheme for inviscid flux discretization. A higher-order spatial accuracy is achieved by using a MUSCL approach, for which both the gradient reconstruction and the slope limiting are given a careful examination-by comparing the convergence and accuracy of multiple methods. The computational model is validated by experimental data on the Fourth Standard Configuration turbine cascade

Rubroboletus le-galiae (Boletales, Basidiomycota), a species new for Poland

Rubroboletus le-galiae is reported for the first time from Poland. Macro- and micromorphological characters of the species are described and illustrated based on the study of material collected at three microlocalities in Łężczok reserve (SW Poland). The delimitation of R. le-galiae from related species of the genus Rubroboletus (R. satans, R. rubrosanguineus, R. rhodoxanthus) is shortly discussed and the knowledge of its ecology and distribution is briefly summarized

Callistosporium pinicola (Basidiomycota), a fungus species new to Poland

Basidiomata of Callistosporium pinicola were collected in years 2012–2013, on strongly decayed fallen trunks of Picea abies and Abies alba on two remote sites, localized in North-eastern and southern Poland. These localities represent the first records of this fungus in Poland. A full description and illustration of C. pinicola based on Polish specimens are provided and the distinguishing features and delimitation of the species are briefly discussed. The ecology of C. pinicola, its general distribution and threat are also presented. As all specimens of C. pinicola were collected only in recent years we suggest that this species is increasing its distribution in Poland. However, we cannot rule out the possibility that, because of its cryptic nature, C. pinicola has been much overlooked in the past

Using a Cloud Computing for a Document Management Implementation for Public Authorities

Import 04/11/2015Diplomová práce se zaměřuje na využití spisové služby za pomocí cloud computingového prostředí ve státní správě České republiky. V teoreticko-metodické části je popsána problematika cloud computingu, který je v této práci klíčový pro implementaci spisové služby. Další část je zaměřena na analýzu současného stavu informačního systému a využití cloud computingu ve státní správě se zaměřením na spisovou službu. Následně je popsán možný způsob implementace, vyhodnocení a ekonomická náročnost tohoto řešení.The diploma thesis is focused on using of document management in cloud computing environment in the state administration of the Czech Republic. In the theoretical and methodological part are described the problems of cloud computing, which in thesis is crucial for the implementation of document management. Next part is focused on analyzing the current state of information system and the use of cloud computing in government, focusing on document management. Then a possible way of implementation, evaluation and economic cost of this solution is described.155 - Katedra aplikované informatikyvelmi dobř

Analysis and Proposal for an Application of Cloud Computing for Company´s Activities Support and its Economic Demands

Import 26/06/2013Tato práce se zaměřuje na analýzu a využití cloud computingových služeb formou předplatného pro male a střední firmy, které využívají klasické licencované řešení. V teoretické části jsou popsány základní pojmy a definice nezbytné pro řešení daného tématu bakalářské práce. Praktická část je zaměřena na analýzu, návrh a vyhodnocení cloud computingového řešení pro konkrétní firmu.This bachelor thesis is focused on the analysis and using cloud computing services for small and medium companies that use traditional licensed solution The theoretical part describes the basic concepts and definitions necessary to address the topic of the bachelor‘s thesis. The practical part is focused on the analysis, design and evaluation cloud computing solutions for the particular company.155 - Katedra aplikované informatikydobř

Numeryczna symulacja aeroelastycznego oddziaływania na profil skrzydła z drugim stopniem swobody

Zvyšování výkonu parních turbín vede k návrhu nízkotlakých stupňů o velkém průměru, vyznačujících se dlouhými a tenkými lopatkami. Interakce pevných těles s prouděním může způsobit vibrace, které mají za následek sníženou životnost stroje kvůli únavě materiálu. Tato práce představuje matematický model interakce pevného tělesa s tekutinou, navržený za účelem zkoumání vibrací způsobených prouděním. Model je zde aplikován na zjednodušený testovací případ osamoceného profilu leteckého křídla. Model proudění je založen na Eulerových rovnicích v Arbitrary Lagrange-Euler formulaci, diskretizovaných metodou konečných objemů. Jeho validace je provedena prostřednictvím srovnání s experimentálními daty a s numerickými výsledky jiných autorů.Die Erhöhung der Leistung von Dampfturbinen führt zum Entwurf von Niedrigdruckgraden mit einem großen Durchschnitt. Diese Grade zeichnen sich durch lange und dünne Schaufeln aus. Die Interaktion der Festkörper mit der Strömung kann Vibrationen erzeugen, welche eine kürzere Lebensdauer der Maschine auf Grund von Materialermüdung zur Folge haben. Diese Arbeit stellt ein mathematisches Modell der Interaktion des festen Körpers mit Flüssigkeit vor, welches zum Zweck der Erforschung von durch Strömung verursachten Vibrationen entworfen worden ist. Das Strömungsmodell basiert auf den Eulergleichungen in der Arbitrary Lagrange-Euler-Formulierung, welche durch die Methode der endlichen Inhalte diskretisiert werden. Die Validierung des Strömungsmodells wird mittels Vergleich mit den experimentellen Daten und mit den numerischen Ergebnissen anderer Autoren durchgeführt.The pursuit of increased steam turbine power output leads to a design of low pressure stages with large diameters, featuring long and thin blades. The interaction of the structure with flow may induce vibrations, leading to a reduced operational life of the machine due to material fatigue. This work introduces a mathematical model of fluid-structure interaction, intended for the investigation of flow-induced turbine blade vibrations. At present, it is applied to a simplified test case of an isolated airfoil. The flow model is based on 2D Euler equations in Arbitrary Lagrangian-Eulerian formulation, discretized by the Finite Volume Method with a second-order accurate AUSM+-up scheme. The structure is modelled as a solid body with one rotational and one translational degree of freedom. The solution is realized iteratively by a time-marching method with a two-way fluid-structure coupling. In each iteration the airfoil surface pressure is integrated to determine the forces and the torsional moment driving its motion. The position of the airfoil in the next time step is obtained and the flow is resolved on a newly recreated mesh. The results of the present model are validated by comparison with experimental data and with numerical results of other models.Zwiększanie mocy turbin parowych skutkuje projektowaniem stopni niskociśnieniowych o dużej średnicy, charakteryzujących się długimi i cienkimi łopatkami. Interakcja ciał stałych ze strumieniem powietrza (wiatrem) może wywołać drgania, które wpływają na skrócenie okresu wytrzymałości maszyny z powodu zmęczenia materiału. Niniejsze opracowanie przedstawia matematyczny model interakcji ciała stałego z płynem, opracowany w celu badania drgań spowodowanych przepływem powietrza. Model można zastosować do uproszczonego testowania samodzielnego profilu skrzydła samolotu. Model przepływu powietrza bazuje na równaniach Eulera w procedurze Arbritrary Lagrange-Euler (ALE), zdyskretyzowanych metodą objętości skończonych. Jego walidację przeprowadzono w drodze porównania z danymi doświadczalnymi i numerycznymi wynikami innych autorów

Advanced testing in rolling contact fatigue for wheel material investigation

Presented paper deals with advanced testing in rolling contact fatigue for wheel material investigation for one type of material, which is used for production process of rail wheel rims. These days, there is no EU standard, which would specify rolling contact fatigue test conditions and requirements to the testing equipment. The aim of this paper is present how to measure geometry of the sample through the rolling contact fatigue test. Monitored variables are width of the contact path in the transversal direction, plastic deformation in the transversal direction and radial direction. Chosen interesting results obtained on own experimental equipment are presented