Browsing by Issue Date, starting with "2014"

Now showing 1 - 20 of 501

Access status: Open Access ,
Acceptance testing of web applications with Test Description Language
(Wydawnictwa AGH, 2014) Olek, Łukasz; Alchimowicz, Bartosz; Nawrocki, Jerzy Ryszard
Acceptance tests are usually created by a client after a part of a system is implemented. However, some methodologies propose the elaboration of test cases before implementing a system. This approach increases the probability of system implementation that fulfills requirements, but may be problematic for customers and testers. To allow acceptance testing in such conditions, we propose to define test cases by recording them on an interactive mockup (a low detailed user-interface prototype). The paper focuses on Test Description Language, a notation used to store test cases.
Access status: Open Access ,
Dynomenid crabs (Decapoda, Brachyura) from Upper Cenomanian-Lower Turonian nearshore, shallow-water strata in the Bohemian Cretaceous Basin, Czech Republic
(Wydawnictwa AGH, 2014) Kočová Veselská, Martina; Kočí, Tomáš
Conditions of preservation of small crabs at nearshore deposits in the Bohemian Cretaceous Basin (BCB) were poor and fossil record is mostly restricted to fragmentary pereiopods, i.e. isolated propodi or dactyli, whereas crab carapaces in the area are rather rare. Excluding three specimens of dynomenid Graptocarcinus texanus Roemer, 1887 and one necrocarcinid carapace fragment, no other carapaces are known from the nearshore deposits of the BCB. These partially crushed carapaces lacking chelipeds or other appendages come from the lower Turonian calcareous siltstones at Kamajka.
Access status: Open Access ,
Experimental testing of methanol sorption on selected coal samples from Upper Silesian Basin
(Wydawnictwa AGH, 2014) Baran, Paweł; Jodłowski, Grzegorz Stefan; Krzyżanowski, Andrzej M.; Zarębska, Katarzyna
This paper summarises the results of methanol sorption on three selected coal samples from Polish collieries. These coals differ in terms of their degree of metamorphism (coal rank), petrography and elemental composition. It was found out that during the sorption of methanol, the sorption capacity is closely related to the structure of the coal surface and the amount of sorbed polar substance tends to decrease with the higher degree of metamorphism. Experimental data were plotted as isotherms. Empirical measurements were supported by thermodynamic analysis of aliphatic hydrocarbons sorption. The procedure is based on the Multisorption Model (MSM) designed for describing small molecules sorption in different types of carbonaceous materials (hard coals, lignites, active carbons).
Access status: Open Access ,
Turing machine approach to runtime software adaptation
(Wydawnictwa AGH, 2014) Rudy, Jarosław
In this paper, the problem of applying changes to software at runtime is considered. The computability theory is used in order to develop a more general and programming-language-independent model of computation with support for runtime changes. Various types of runtime changes were defined in terms of computable functions and Turing machines. The properties of such functions and machines were used to prove that arbitrary runtime changes on Turing machines are impossible in general cases. A method of Turing machine decomposition into subtasks was presented and runtime changes were defined through transformations of the subtask graph. Requirements for the possible changes were considered with regard to the possibility of subtask execution during such changes. Finally, a runtime change model of computation was defined by extension of the Universal Turing Machine.
Access status: Open Access ,
Diagenetic impact on reservoir quality in deeply buried tight Rotliegend Sandstones - case study of Polish Permian Basin
(Wydawnictwa AGH, 2014) Nosal, Justyna
During burial, sediments and rocks undergo physical and chemical changes due to temperature and pressure growth. All these processes are known as diagenesis (Boggs 2009). These changes play an important role in postedpositional modification of reservoir parameters, such as porosity, permeability and filtration.
Access status: Open Access ,
Selected implications of negative externalities - on the example of the Polish energy sector
(2014) Kudełko, Mariusz; Wejer, Małgorzata
The aim of this paper is to present selected issues of the effective allocation of resources and its function in optimal decision-making processes. The authors focus on the economic consequences of market failure in the case of external effects - both positive and negative. It has been characterized from the theoretical perspective by illustrating the economic implications of this situation for producers (producers surplus), consumers (consumer surplus), and the environment (external costs and benefits). This paper shines a light on effective levels of production, the subsidies to producers (in the case of positive externalities), or correcting tax (in the case of negative externalities). Moreover, the decision rules that are used in the cost-benefit analysis (a method supporting the decision-making process undertaken by both private entities and public authorities) are given. There are specific examples of its application in order to achieve allocative efficiency. An exception of its use is to achieve cost efficiency, which does not ensure that a project, program, or policy is socially optimal and desirable. The second part of this paper includes theoretical implications of market failure. The results of the authors' mathematical model that is used to optimize long-term energy sector development are presented. The importance of the presented results is that they reflect development of the Polish energy sector, both from the private and public viewpoint, taking into account the adverse effects caused by the emission of gaseous pollutants. Consumer and producer surpluses were the bases to estimate costs and benefits of change in the social welfare. It has been proven that the use of private welfare criterion is incorrect. The internalization of external costs (which means including them in decision-making criterion, significantly - i.e., 24%) increases the level of social welfare achieved on the scale of the whole Polish energy sector.
Access status: Open Access ,
Mineralogia i struktura wybranych surowców jako czynnik ich jakości
(2014) Pawlikowski, Maciej ; Wróbel, Marta
Paper present results of mineralogical examination of various genetic types of flints and obsidian were performed using polarizing light microscopy, SEM and EDX methods were performed during last 30 years. Various method were used for determining possible relations between internal structures of these raw materials and relations to the best directions for processing. Analyses showed that the best directions for preparation of flint implements are parallel to directions of optical orientation of micro crystalline quartz present in flint. This orientation was the result of the recrystallization process of silica from opal to chalcedony and quartz. The type of processes known as ageing of silica active and observed in flint nodules have persisted for a million years. The growth of microcrystals in primary opal of flints goes a specially well perpendicularly to the direction of stress, i.e., perpendicular to the thickening of rock layers (mostly limestones). Performed investigation confirmed the primary flint nodules formed in situ from sponga organisms show regular nodule shapes. Secondary flints formed due to migration of dissolved silica in deposited sediment had mostly irregular shape. Secondary crystals of quartz present in these flints do not show space orientation and because of this the secondary flints are bad for knapping.
Access status: Open Access ,
Designing folding wall box pallets
(2014) Wolny, Stanisław; Ładecki, Bogusław; Matachowski, Filip
Designing of modern box pallets with folding walls, which are used for example to transport tires, requires fulfilment of a number of performance requirements. Such pallets, adapted to be moved by forklifts, are stored or transported without loading with walls folded, and during operation they are put together in the piles of a few pieces and braced by the transport belts. Difficult operating conditions are related to necessity to provide resistance of construction of a pallet or their pile on: bending, piling, stability, hitting in case of a free-fall, lifting by forklift, as well as the resistance to horizontal strokes by both edges and legs. In order to meet the above mentioned requirements, it is necessary to implement the relevant tensile FEM analyses, which are then reviewed by the relevant experimental testing. The paper discuss the requirements specified by standards for designing of the above mentioned pallets and presents FEM results in the process of pallets' designing.
Access status: Open Access ,
The vision of students regarding tomorrow's world in European engineering education
(2014) Duşe, Dan Maniu; Duşe, Carmen; Nemeş, Cătălin
Starting from Michael Rendell and his team's »Managing tomorrow's people«, this paper sets out to build a possible future of leadership in the European engineering education by taking the students' view on tomorrow's world into consideration. We can ask ourselves if European technical universities, and engineering education in particular. could exist in a Blue, Green and Orange World. How would they look like and how efficient would »corporate« universities be, assuming that the Blue World would prevail in the next 10 years. What should their development strategies be and what labor markets would absorb their graduates? What if universities would be in the Green or Orange World? What leaders should they have then? Starting from these questions we try to construct possible scenarios for a European reality.
Access status: Open Access ,
Study of the stress strain of rock massif in the crooked wellbore
(2014) Černova, Miroslava Êvgenìïvna; Kunĉak, Âroslav Vasi'ovič
We investigated the stressed-deformed state of rock mass in a deviated borehole. There were received the analytical dependencies for the determination of circular and radial stress that allows for a science-based approach to the design of a borehole profile during the drilling process in the uneven horizon of rock mass of such reservoirs as Dnipro-Donetsk Depression and Black Sea Shelf and the construction of hydroacoustic directional energy devices with controlled parameters.
Access status: Open Access ,
Damage localization and monitoring of load changes in truss structures
(2014) Mendrok, Krzysztof
In recent years one can observe an increasing interest of the researchers, both from academia and industry, in the development of systems for the monitoring of health structures. The main fields of application for these systems are rotating machinery, aircrafts and other means of group transport and civil engineering structures. Many of the latter, contain truss elements in its structure. That is why detection and possible localization of the fault in such a structures is crucial for the safety of its operation. In this paper the application of modal filtration to damage detection and localization in the truss structures is presented. The results of numerical simulation an laboratory experiment are shown.
Access status: Open Access ,
Layering of façades - a few comments on the colour of Krakow's façades in earlier and contemporary times
(Wydawnictwa AGH, 2014) Komorowski, Waldemar
Witnesses to a bygone age, <i>façades are evidence of past life. Interpretation of traces, and particularly colours, aids to recognize old tastes and moods</i>. This paper reviews ornamentation methods used for the outerwalls of buildings in Krakow from the city foundation (1257) until the 1950s. The first part of the paper presents evidence to corroborate a theory that, in spite of a common misconception, medieval façades were not left in their raw condition but plastered. Obviously, plaster did not recall its modern clear and even equivalent, but was greyish and bumpy. Usually this plaster received a multicolour painted finish. Surprisingly for our contemporaries, stone details such as window and door stone work were also painted, the practice being common until the end of the 18$^{th}$ century. Ornamentation methods varied throughout the ages, though rich colouring was popular and characteristic for Gothic, Renessaince, Baroque and Classicism. Dimmed colours as seen in the second half of the 19$^{th}$ century were only occasional in fact. The older the building, the more plaster and painted layers it would receive. Learning about this layering takes us through the history of the building.
Access status: Open Access ,
Potential effect of pH on the leaching of heavy metals from sediments of the Carpathian dam reservoirs
(Wydawnictwa AGH, 2014) Szarek-Gwiazda, Ewa
Eutrophication processes occurring in the Carpathian dam reservoirs (southern Poland) have resulted in a drastic increase of incidences of decrease of pH and oxygen content in near-bottom water, which may affect metal remobilization from the sediment. The study is aimed to determine the buffer capacity and effects of decreasing pH on the remobilization of heavy metals (Cd, Pb, Cu, Zn, Mn and Fe) from sediments of the Dobczycki Reservoir (DR), the Czorsztyński Reservoir (CR), and the Rożnowski Reservoir (RR), the right side tributary of the Vistula River. Buffering capacity and the leaching of heavy metals from sediments accompanied with an increase in acidity were analyzed in 0.00-0.24 M $HNO_{3}$ solutions. Studied sediments had a high buffer capacity. Buffer capacity of sediments at studied sites of the DR and CR was different due to differences in the composition of sediments. The reservoir sediments had a variable ability to release heavy metals with increasing acidity. At pH ~5 and pH ~3, a considerable leaching of Mn (up to 60% and 85% of the total amount, respectively), Cd (up to 35% and 56% respectively), Pb (up to 25% and 39%), the lower leaching of Cu (up to 18% and 30%) and Zn (up to 14% and 20%), and the lowest leaching of Fe (below 5%) were found. The decrease of pH of the water-sediment system caused by eutrophication processes may affect the mobilization of certain heavy metals (mainly Mn, Cd and Pb) from sediment into the water column of the studied Carpathian reservoirs.
Access status: Open Access ,
Competitive sorption of selected anions on modified halloysite
(Wydawnictwa AGH, 2014) Prokop, Anna; Matusik, Jakub
Halloysite is a polytype of kaolinite exhibiting a 1:1 layered structure with the chemical composition of $Al_{4}Si_{4}O_{10}(OH)_{8}$. Synthesis of new materials based on kaolinites has received wide attention recently (e.g. Dedzo et al. 2012).
Access status: Open Access ,
Proces odrodzenia praw amerykańskich ludów rdzennych na przykładzie »prawa do ziemi« kanadyjskich Inuitów
(Wydawnictwa AGH, 2014) Bonusiak, Grzegorz
The Inuit lives in the areas attending along the Arctic Circle, from the Aleutians and Alaska, the northern part of Canada, to belonging to Denmark Greenland. The census of 2006 showed there is about 50 thousand of Inuit in Canada. In the second half of the twentieth century they joined the efforts to change the situation of indigenous peoples residing in the territory of Canada. Initially marginalized and neglected by the white majority, they were able to resist the dominant culture and maintain their own individuality, and even to earn the right to decide of their own fate. They have successfully used the processes occurring in the international arena and domestic politics in Canada, combining their efforts with those of the American Indians. As with other aboriginal people around the world, for the Inuit an extremely important issue was the possession and use of land and its resources. The crowning of their efforts was the creation from the areas inhabited by them a separate territory of Nunavut. This paper presents the process of revival of the Canadian Inuit and the current scope of their autonomy. It draws attention to the conditions and processes linking them with the American Indians and the Métis, and to the issues and consequences of differences in the fate and status of the Inuit. The problem of »land rights« and different from European understanding of it was particularly brought into prominence.
Access status: Open Access ,
Influence of low frequency vibrations on drillstring dynamics
(2014) Černova, Miroslava Êvgenìïvna
During the drilling process, between the drilling bit that ruins the rock in the bottom-hole and the energy source located on the ground surface is the drillstring that has certain length and small cross cuts that define the dynamics of the drilling bit work. Along with the development of science, for optimization of drilling processes were developed and continue to be elaborated mathematical models that use empirical dependencies based mainly on laboratory data which are very far away from the real conditions of well construction and fail to take into account all the peculiarities of this process. Thus, the management of the drillstring dynamics related to an increase in the effectiveness of deep directional and horizontal wells drilling process through the minimization of torsional and longitudinal low frequency vibrations of drilling instrument is a matter of topical interest nowadays.
Access status: Open Access ,
Finite element analysis of adhesive bonds using the cohesive zone modeling method
(2014) Korta, Jakub; Młyniec, Andrzej; Zdziebko, Paweł; Uhl, Tadeusz
This paper covers the subject of FE modeling of adhesive joints, which is gaining more and more attention in contemporary industry, especially in the aerospace and automotive sectors. This technique of creating structural connections possesses many advantages over mechanical or welding methods and it seems that it will be exploited extensively in the future mechanical design. The ability of joining dissimilar materials decreased minimum member cross-section size and corrosion inertness can be considered as its most important features. However, in the era of virtual prototyping, it is necessary to conduct reliable computer-assisted analyses of these types of joints. It is because most of the contemporary structures are developed as numerical models first, and only the final pro duct is prototyped physically, to validate the simulation results. The aim of this paper is to demonstrate how to elaborate reliable and accurate adhesive joint models, using a cohesive zone modeling (CZM) method in conjunction with shell-based models. The major profitable consequence of using this modeling technique is that it results in a relatively small number of spatial degrees of freedom, therefore allows for short computational times.
Access status: Open Access ,
The analysis of technology of drilling with roller bits on the Carpathian foreland area in the years 1995-2011
(2014) Rzyczniak, Mirosław; Rajchel, Grzegorz
In the article, there has been described results of the statistical analysis lead towards two groups of roller bits, with bit teeth, with diameters 0,216 m and 0,4445 m produced by Drilling Equipment and Device Company »GLINIK«. Using these bits, there had been conducted a process of drilling holes on the Carpathian foreland area in the years 1995-2011. According to the analysis of a dispersion of measure points it was assigned linear regression equations and lead significance tests for values of the correlation factors and linear regression factors, drilling technology parameters dependency (weight on bit, rotational speed, product of normalized weight on bit and rotational speed, drilling mud capacity flow rate) and bit performances (rebore, drilling time, average rate of penetration), since the year in which analyzed bits were used. The results of the researches has been showed in the form of charts of dispersion of measure points with lines and regression equations and lines of confidence intervals. The results of significance tests for correlation factors and linear regression factors has been inserted in tables. The purpose of lead analyses were acquiring information about changes of drilling technology parameters in a long period of time and about their influence on bit performances' values.
Access status: Open Access ,
Thematic map as a basis for the world´s geoinformation system in chronological approach
(2014) Mika, Monika
Geoinformation can be defined according to [9] as a discipline dealing with the collecting, obtaining, gathering, processing, transmission, analysis and interpretation of data about the Earth. These data are collected for centuries on maps. Regardless of forms of cartographic elaborations changing with the development of technics, the basic function of each map (and especially of thematic maps) was, is and will be the transfer of data about the world in the graphic form. The first maps were prototypes of modern geoinformation systems. In the literature one can find many definitions of these systems. According to [6] it is a computer information system for entering, storing, processing and the presentation of spatial data, which primary function is to support the decision. The purpose of this publication is the cross-sectional analysis of the methods and forms of presentation of maps (with particular emphasis on thematic maps) in Poland and in the world over the centuries. From woodcuts or clay tablets to today created and widely used interactive map. The basic thesis of the publication is to see the map as a basis for geoinformation system at every stage of development.
Access status: Open Access ,
Complex Event Processing approach to automated monitoring of a particle accelerator and its control system
(Wydawnictwa AGH, 2014) Grzegorczyk, Karol; Baggiolini, Vito; Zieliński, Krzysztof
This article presents the design and implementation of a software component for automated monitoring and diagnostic information analysis of a particle accelerator and its control system. The information that is analyzed can be seen as streams of events. A Complex Event Processing (CEP) approach to event processing was selected. The main advantage of this approach is the ability to continuously query data coming from several streams. The presented software component is based on Esper, the most popular open-source implementation of CEP. As a test bed, the control system of the accelerator complex located at CERN, the European Organization for Nuclear Research, was chosen. The complex includes the Large Hadron Collider, the world’s most powerful accelerator. The main contribution to knowledge is by showing that the CEP approach can successfully address many of the challenges associated with automated monitoring of the accelerator and its control system that were previously unsolved. Test results, performance analysis, and a proposal for further works are also presented.