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Search results for: data%20analysis
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Polarization state analysis in optical coherence tomography
PublicationW artykule zaprezentowano metody analizy stanu polaryzacji światła w systemach optycznej tomografii kohererentnej. Przedstawiono różne konfiguracje systemu PS-OCT wraz z ich parametrami oraz właściwościami. Omówiono zasadę pomiaru stanu polaryzacji ściatła przy użyciu systemu PS-OCT oraz przeprowadzono dyskusję nad przydatnością metody do badania struktury materiałów silnie rozpraszających promieniowanie.
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Analysis of a high-quality photonic crystal resonator
PublicationArtykuł przedstawia kompleksową analizę rezonatora 2D o wysokiej dobroci uzyskanego dzięki zastosowaniu fotonicznych kryształów. Struktura rezonatora została zoptymalizowana w celu osiągnięcia maksymalnej dobroci. Analiza została wykonana przy pomocy metody FDTD z zaimplementowanymi makromodelami, a wyniki poddano następnie obróbce cyfrowej w oparciu o technikę GPOF. Taka kombinacja zastosowanych metod okazała się bardzo efektywna...
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An integrated analysis of protection layers in hazardous systems
PublicationGłównym tematem niniejszej publikacji jest dyskusja nad wybranymi zagadnieniami związanymi z analizą bezpieczeństwa funkcjonalnego infrastruktury krytycznej oraz obiektów podwyższonego ryzyka. Problematyka bezpieczeństwa funkcjonalnego związana jest z międzynarodowymi normami IEC 61508 oraz IEC 61511. W artykule przedstawiono problematykę zintegrowanej oceny bezpieczeństwa funkcjonalnego wraz z uwzględnieniem analizy warstw zabezpieczeń...
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Sensitivity analysis of critical loads of I-columns
PublicationThe first order variation of critical buckling load of thin-walled columns with bisymmetric open cross-section due to some variations of the design variables such as: cross-section dimensions, or material characteristics is derived. The influence of the residual welding stresses is taken into account. In the numerical examples dealing with I-column the functions describing the effect of the variation of the dimensions of the flange...
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Analysis of reliability of redundant ship power plants
PublicationW referacie przedstawiono możliwości wykorzystania teorii procesów semimarkowskich do określania charakterystyk niezawodnościowych złożonych układów napędowych o zadanym stopniu redundancji. Na przykładzie wybranego układu zaproponowano model niezawodnościowy w formie procesu stochastycznego dyskretnego w stanach i ciągłego w czasie. W oparciu o rozkład graniczny procesu wskazano na praktyczne aspekty wykorzystania uzyskanych w...
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Impacts of salvage logging on biodiversity: A meta-analysis
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The analysis of the empathy factor in students of medical sciences
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An Analysis of the Homonemic Community of the Finnish and Russian Languages
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Spectroscopic verification of ionic matrices for MALDI analysis
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Applications of water molecules for analysis of macromolecule properties
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Analysis of blood vessel topology by cubical homology
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Combinatorial-topological framework for the analysis of global dynamics
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Substance flow analysis for mercury emission in Poland
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Analysis of TL and OSL kinetics of lithium aluminate
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Synthesis and structure analysis of ferrocene‐containing pseudopeptides
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Analysis of the exposure of Polish lakes to flood risk
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Experiments and Analysis of the Limit Stresses of a Magnetorheological Fluid
PublicationPaper presents the results of a rheological test of a commercial magnetorheological (MR) fluid (MRF-132DG). The researchincludes the problem of measuring and interpreting limit stresses under conditions close to the magnetic saturation of the fluid. Fourdifferent limit stresses were determined, two related to the yield point and two related to the flow point. Methods for determining limitstresses, especially due to excitation...
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The analysis of turbine propulsion systems in nuclear submarines
PublicationThe article systematises submarines, which are presently in service, according to their propulsion types (both conventional and nuclear), power output, and submersion depth. Contemporary types of propulsion systems installed and used in submarines are discussed. Calculations were performed for the PWR (Pressurized Water Reactor) type nuclear propulsion system and the supercritical turbine propulsion system (supercritical reactor...
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Extending Service Selection Algorithms with Interoperability Analysis
PublicationApplication development by integration of existing, atomic services reduces development cost and time by extensive reuse of service components. In Service Oriented Architecture, there exist alternative versions of services supplying the same functionality but differing in Quality of Service (QoS) attributes, which enables developers to select services with optimal QoS. Existing algorithms of service selection focus on the formal...
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Knowledge management in the processes of project requirements analysis
PublicationAuthors, based on one of popular software project management methods as RUP fo-cused on one of most important discipline in project management as requirements management. Authors decomposed the role of the business analyst and present methodological and realizational processes of knowledge managament in traditional and applied sources of knowledge tied with this role. An experiment was conducted in four project teams of all sizes,...
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Analysis of balancing of four stroke V6 engines
PublicationAnalysis of balance of V6 engines with a common-pin crankshaft depending on a cylinder bank angle and the crank radius to connecting rod length ratios , based on the relations derived, is presented in the paper. The bank angles providing the lowest moment of inertia forces in reciprocating motion, for selected values, were determined. The position of the plane of the main counterweights in order to maximum balance of the moment...
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Corrosion monitoring by harmonic analysis in aqueous environments
PublicationThis paper presents tests concerning the rate of corrosion in non-alloy steel (type S235JR) in an aqueous environment, with an additive of sodium chloride by means of polarization resistance measurements and harmonic analysis. The tests have been carried out for steel samples exposed to the testing environment for six weeks, in order to obtain a constant rate of corrosion in the function of time. The measurements have aimed at...
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Usage of concentrated spectrogram for analysis of acoustical signals
PublicationA novel precise method of signal analysis in the time-frequency domain is presented. A signal energy distribution is estimated by discard and displacement of energy parts of the classical spectrogram. A channelized instantaneous frequency and a local group delay are used in order to energy replacement. Additionally, newly introduced representations such as: a channelized instantaneous bandwidth and a local group duration are used...
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An Analysis of Multistrip Line Configuration on Elliptical Cylinder
PublicationA configuration of multistrip lines mounted on a multilayer dielectric coated elliptic cylinder is investigated in this paper. A full-wave analysis and a moment-method calculation are employed. The analysis is carried out considering the expansion of the field as a series of Mathieu functions. Both open and shielded lines are considered in the analysis. Propagation coefficients and characteristic impedances are calculated for the...
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The use of Markov chains in the social convergence analysis
PublicationThe main goal of this article is to analyze the social convergence process using Markov chains. In this research, term social convergence refers to the reduction of dispersion in the standard of living among countries. The use of Markov chains in the social convergence analysis allowed describing movements of observational units within the distribution and providing more details about the mechanism of the convergence process. A...
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ANALYSIS OF BRACE STIFFNESS INFLUENCE ON STABILITY OF THE TRUSS
PublicationThe paper is devoted to the numerical and experimental research of stability of a truss with side elastic supports at the top chord. The structure is a model of a real roof truss scaled by factor ¼. The linear buckling analysis and non-linear static analysis were carried out. The buckling length factor for the compressed top chord was calculated and the limit load for the imperfect truss shell model with respect to brace stiffness...
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ANALYSIS OF THE PUNCHING FAILURE MECHANISM IN WORKING PLATFORMS
PublicationPaper presents an analysis of the shear failure mechanism which occurs from the punching of a working platform layer in relation to its thickness, grain size arrangement and mechanical properties, taking into consideration the interaction with soft subgrade. The study is based on the observations of performance of natural scale structures (Streefkerk) and the results of model investigations numerically represented with the use...
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3D Buckling Analysis of a Truss with Horizontal Braces
PublicationThe present research is devoted to the study of out–of–plane buckling of a truss with horizontal braces. The truss is a model of real roof truss scaled by factor 1=4. A linear buckling and a non–linear analysis with geometric and material non–linearity were carried out. The truss buckling and limit load for different stiffnesses and number of braces are found. Numerical analysis are verified by experiment. Threshold bracing stiffness condition...
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The Use of Wavelet Analysis to Denoising of Electrocardiography Signal
PublicationThe electrocardiography examination, due to its accessibility and simplicity, has an important role in diagnostics of the heart ailments. It enables quick detection of various heart defects, undetectable by other kinds of diagnostic tools, so it is very popular. Nevertheless, the measured signal is exposed to a different disturbances. Among them, the electromagnetic interferences, drift of reference electrode and high frequency...
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Failure Analysis of footbridge made of composite materials
PublicationFinite element method analysis of a pedestrian footbridge made of sandwich material is presented. The internal structure of the material is modelled as a structural shell assuming the Equivalent Single Layer approach (ESL). Two FEM commercial codes are employed. The response of the structure is studied in order to determine the load level that activates Hashin and Tsai-Wu failure criteria. Some practical aspects of designing footbridges...
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RESIDUE ANALYSIS OF ETU AND PTU BY LC/MS
PublicationDithiocarbamates (DTCs) are important organosulfur compounds, which act as inhibitors of metal dependant and sulphydryl enzymes and have a serious consequence on biological systems. They possess variety of applications in agriculture as fungicides, as well as, in the rubber industry as vulcanization accelerators and antioxidants. In this way, DTCs are the main group of fungicides used to control approximately 400 pathogens of more...
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Analysis of the process of water entry of an amphibious vehicle
PublicationThe paper presents a method of computational and experimental analysis of the process of water entry of an amphibious vehicle. The computational method is based on the Reynolds Averaged Navier-Stokes Equations (RANSE) solver and the xperiment was carried out in the towing tank at Ship Design and Research Centre S.A. with the use of a scale model. The analysis was focused on the safety of water entry, i.e. the maximum pitch and...
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STABILITY ANALYSIS OF A TRUSS WITH SLOPING ELASTIC BRACES
PublicationSteel trusses have a much greater strength and stiffness in their plane than out of their plane, and therefore should be braced against lateral deflection and twisting. Such elements like purlins apart from bearing vertical load are part of bracing that stabilize roof trusses against distortional buckling. The stability of trusses with elastic bracing was investigated in an experimental research. Braces situated at some angle measured...
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Space syntax analysis - methodology of understanding the space
PublicationNowadays space is considered as a net of connections between different areas. The questions how to delineate its character and how it is possible to objectively compare two spaces is the matter under consideration. This was the reason for creating new theories about the structure of place. "Space syntax analysis" (SSA) or simply "Space Syntax" defines a number of theories and research areas devoted to the analysis of space configuration....
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Analysis of activity of people using motion sensors
PublicationThe article presents the designed and implemented system for activity monitoring of people using passive motion sensors and methods for activity maps generation. In the paper he method is presented and results obtained for simulated data and for data from observations with the participation of people.
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Laboratory Stand for Wideband Analysis Radiocommunication Signals
PublicationA laboratory stand for wideband analysis radiocommunication signals is presented in the paper. The stand is designed for signals acquisition in wide spectrum and research a field of digital signal processing. Procedures used for simultaneous acquiring many frequency channels in selected wide band are described. The method of detection of direct sequence spread spectrum signals (DS SS) which power spectral density is lower than...
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Buckling analysis of cold formed steel column
PublicationW pracy przedstawiono analizę słupa zimnogiętego o przekroju otwartym. Przeprowadzono analizy statyczne liniowe i nieliniowe. Analizowano wpływ podłoża sprężystego oraz sztywność połączenia dwóch sąsiednich słupów.
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Laboratory stand for wideband analysis radiocommunication signals
PublicationA laboratory stand for wideband analysis radiocommunication signals is presented in the paper. The stand is designed for signals acquisition in wide spectrum and research a field of digital signal processing. Procedures used for simultaneous acquiring many frequency channels in selected wide band are described. The method of detection of direct sequence spread spectrum signals (DS SS) which power spectral density is lower than...
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Contour Analysis of Bleeding Regions in Endoscopic Images
PublicationThis paper investigates the problem of detecting bleeding regions in images acquired from endoscopic examinations of gastrointestinal tract. The purpose is to identify the characteristic features of bleeding areas' contours in order to develop an accurate method for discriminating between true bleeding regions and missed detections, which could lead to a significant reduction of the false alarm rate of existing blood-detection...
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Numerical analysis of scale effects in open propellers
PublicationArtykuł przedstawia numeryczne badania efektu skali powodującego różnice w charakterystykach hydrodynamicznych śrub okrętowych wyznaczonych dla skali rzeczywistej i dla skali modelowej. Zaprezentowano wyniki obliczeń dla trzech przykładowych śrub, pokazując poprawki na efekt skali wyznaczone według czterech różnych metod.
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Concentration in ICTs sector - cross country analysis
PublicationIn the chapter below, the author present inequalities in sector of new information and communication technologies. Having in mind inequalities we can also discuss concentration issues, and the concentration itself is a problem to which the author refers on first place. The paper is organized as following: first basic measures of concentration are defined, after we can read a discussion referring to concentration in ICTs sector...
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An automated aystem for analysis of mouse movement activity
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Mesoscopic impedance analysis of solid materials surface
PublicationSeveral techniques have been developed in order to characterize electrical properties of surfaces in micrometer/nanometer scale. Obtaining of the spatial distribution of sample resistance, capacitance or potential requires separate measurements performed in different scanning modes. On the other hand, analysis of the frequency response of investigated system enables determination of several physical quantities in single measurement...
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Pesticide analysis of bee and bee product samples
PublicationBee products possess therapeutic properties and are the source of many essential trace elements,which is why they are regarded as valuable food products. Honey bees may bring to thehive numerous contaminants deposited on the plants they visit, including pesticide withoutxenobiotics. The large-scale application of pesticides in agriculture and horticulture can lead tomass mortality among bees, and the chemicals find their way into...
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User authentication based on keystroke dynamics analysis
PublicationW pracy przedstawiono kilka metod, które można wykorzystać do uwierzytelniania użytkowników na podstawie rytmu pisania na klawiaturze. Dwie z opisanych metod wykorzystują miarę odległości zdefiniowaną do porównywania wpisywanych tekstów, natomiast trzecia analizuje parametry rozkładów cech wydobytych z wpisywanych tekstów. Algorytmy te zostały przetestowane na dwóch zbiorach danych. Ponadto oceniona została efektywność metody powstałej...
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Experimental and theoretical analysis of dryout in annular flow
PublicationW pracy opisano badania eksperymentalne kryzysu wrzenia typu dryout, przeprowadzone w pionowych rurkach o średnicy wewnętrznej 1.15 i 2.3 mm z wykorzystaniem dwóch czynników roboczych, tj. SES36 i R123. W oparciu o wyniki tych badań zaproponowano ogólną korelację na krytyczny strumień ciepła w minikanałach.
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Static and dynamic analysis of thin-walled frames
PublicationW pracy przedstawiono model ramy zbudowanej z elementów cienkościennych o przekrojach otwartych stosowany w analizie statycznej i dynamicznej za pomocą metody elemntów skończonych. Model składa się z elementów opisanych teorią prętów cienkościennych o przekrojach nieodkształcalnych oraz superelementów węzłowych. Proponowany model pozwala na ujęcie w analizie efektów bimomentowych oraz deformacji konstrukcji w miejscach lokalizacji...
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Analysis of IPv6 handovers in IEEE 802.16 environment
PublicationThe second generation of WiMAX solutions, based on IEEE 802.16-2005 standard, offers limited mobility support. Unfortunately, after quickly changing the point of attachment on the WiMAX data link layer (DLL), very slow and inefficient IPv6 reconfiguration takes place. Delays introduced by automatic configuration (DHCPv6 and IPv6 protocols) and Mobile IPv6 can easily diminish or even render useless all benefits gained using the...
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Analysis of circular cavity with tunable combline resonator
PublicationArtykuł prezentuje analizę rozpraszania fali elektromagnetycznej na obiekcie cylindrycznym umieszczonym we wnęce rezonansowej. Metodą analizy jest metoda dopasowania rodzajów.
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Current measurement and analysis for induction motor diagnostics
PublicationPrzedstawiono sposób diagnozowania łożysk tocznych w silnikach indukcyjnych z wykorzystaniem pomiarów i analizy prądu zasilającego silnik. Zaprezentowano metodę pomiarową i opracowania danych diagnostycznych. Uzyskano zgodność częstotliwości składowych widma prądu otrzymanych z badań teoretycznych i eksperymentalnych.Podano wyniki badań łożysk o róznych uszkodzeniach i prawdopodobieństwa poprawnych diagnoz.