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    Wyświetlanie 1-7 z 7
    Tytuł:
    Advances in DGA-based diagnosis of power transformers - selected techniques
    Postępy w diagnostyce transformatorów w oparciu o wyniki analizy chromatograficznej rozpuszczonych w oleju gazów - przegląd zastosowań nowych metod
    Autorzy:
    Szczepaniak, P. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/257515.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
    Tematy:
    diagnostyka
    transformator
    analiza chromatograficzna
    gaz
    obliczenie inteligentne
    standard IEC
    intelligent data analysis
    clustering
    classification
    diagnosis of power transformers
    Opis:
    To a large extent, the chromatographic data obtained by measurements on power transformers reflect the state of a power transformer and allow the assessment of possible faults. The distribution of real learning data is not even approximately uniform and makes the partitioning of decision space difficult. The purpose of this paper is to present the results of the application of an EC-based classifier and a number of novel methods.
    Jak wiadomo, wyniki analizy chromatograficznej gazów rozpuszczonych w oleju transformatorowym (Dissofoed Gas Analysis - DGA) mogą być użyte do diagnostyki transformatorów. Zwykle rozmieszczenie tych danych (ściśle ilorazów koncentracji wybranych gazów) w przestrzeni jest bardzo nierównomierne, a ponadto jednoznaczny podział tej przestrzeni na obszary decyzyjne o rozsądnej wielkości i liczbie jest bardzo trudny. Celem pracy jest dokonanie przeglądu zastosowań nowych metod, wśród nich tych mających korzenie w obliczeniach inteligentnych i odniesienie się do wyników uzyskiwanych za pomocą standardu EC (International Electrotechnical Commission).
    Źródło:
    Problemy Eksploatacji; 2011, 2; 189-199
    1232-9312
    Pojawia się w:
    Problemy Eksploatacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cryptology Laboratory - its quality system and technical competence according to the ISO/IEC 17025 standard
    Autorzy:
    Wicik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/308332.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    cryptology laboratory
    certification
    accreditation
    quality system
    ISO/IEC 17025 standard
    Opis:
    A laboratory is an organization which operates a quality system, has technical competence, generates valid results and its quality system and technical competence are conformed and recognized. A cryptology laboratory operates in information technology security area, where cryptographic methods of information protection play main role. Appropriate confidence, correctness and effectiveness of security services is needed and may be achieved trough development, evaluation, accreditation and certification processes performed by competent and commonly recognized organizations like: laboratories, certification and accreditation bodies. We describe in the paper the accreditation and certification structure and the IT security framework and also the role of the cryptology laboratory in this structure and framework.
    Źródło:
    Journal of Telecommunications and Information Technology; 2004, 4; 58-63
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fractional-order models: The case study of the supercapacitor capacitance measurement
    Autorzy:
    Lewandowski, M.
    Orzyłowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200370.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fractional calculus
    supercapacitor model
    capacitance measurement
    IEC standard
    rachunek różniczkowy
    model superkondensatora
    pomiar pojemności
    norma IEC
    Opis:
    At the beginning of the paper, the fractional calculus is briefly presented. Then, the models of dielectric relaxation in supercapacitors are described. On the basis of the Cole-Cole model, a fractional-order model of supercapacitor impedance is formulated. The frequency characteristics of selected supercapacitors and their voltage response to a current step are assumed as a basis for the analysis of their dynamics. An example of the fractional dynamic model application was used for the critical assessment of the IEC standard recommendation on the conditions of supercapacitor capacitance measurements. The presented study shows some imperfections of the IEC standard recommendations, which probably result from the use of an inaccurate dynamics model. At the end of the paper, the authors propose a solution to this problem by changing the measurement conditions and introducing a concept of dynamic capacitance. The conclusions of the paper indicate that the models of fractional-order dynamics may be useful not only for the control purposes but also in other domains.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 4; 449-457
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mini-DCS system programming in IEC 61131-3 structured text
    Autorzy:
    Rzońca, D.
    Sadolewski, J.
    Stec, A.
    Świder, Z.
    Trybus, B.
    Trybus, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/384239.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    mini-DCS system
    control program execution
    ST language
    compiler
    IEC 61131-3 standard
    virtual processor
    Opis:
    A prototype environment called CPDev for programming small distributedsmall-distributed control-and-measurement systems in Structured Text language of IEC 61131-3 standard is presented . The environment is open what means that the code generated by the compiler can be executed on different hardware platforms. However, such universal code must be processed by an interpreter, another words by a virtual machine,an interpreter, another words by- a virtual machine, must process such universal code similarly as programs written in Java. The CPDev environment consists of the compiler, simulator and configurer of hardware resources (i.e. communications). They are developed in C# at MS.NET Framework 2.0 platform. CPDev is open allowing the user to create function blocks and libraries. External interface procedures (drivers) can be written by hardware designers and linked with the universal code. Free selection of data types required by different applications is provided. Virtual machine written in ANSI C is dedicated for a particular processor. So far the machines for AVR, MCS-51 and PC have been developed. Programming a mini-DCS system from LUMEL Zielona Góra has been the first application of CPDev.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2008, 2, 3; 48-54
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compiler and virtual machine of a multiplatform control environment
    Autorzy:
    Sadolewski, Jan
    Trybus, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/2173658.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    control environment
    IEC 61131-3 standard
    intermediate language
    compiler
    runtime virtual machine
    kontrola środowiska
    norma IEC 61131-3
    język średniozaawansowany
    kompilator
    wirtualna maszyna uruchomieniowa
    Opis:
    Design and operation of a compiler and virtual machine, being the essential components of a multiplatform control programming environment, are presented. The compiler translates source programs written in Structured Text language of the IEC 61131-3 standard into executable code in a dedicated intermediate language. The virtual machine, i.e. a specially designed processor implemented in software, is a runtime part of the environment executing the code in real time. Due to memory-to-memory operation principle the machine is able to process various data types defined in the standard. The focus is given on overloading and extensibility of the functions, as well as on uniform invocations of Program Organization Units. By selection of addressing mode, the environment can be deployed on multiple hardware platforms, beginning from 8-bit microcontrollers up to 32/64-bit industrial PCs. Industrial applications are indicated.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 2; art. no. e140554
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accredited Calibration Laboratory for Sound Measurements
    Autorzy:
    Podgórski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/114156.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    ISO / IEC 17025 standard
    accreditation of calibration laboratory
    calibration of sound level meter
    acoustic calibrator
    band-pass filters
    personal sound exposure meter
    Opis:
    The article presents basic concepts related to accredited calibration laboratories in accordance with ISO/IEC 17025. It describes in detail one of the only few existing in Poland calibration laboratories which deals with instruments for sound measurements. This laboratory is an interesting case as it is the only one in Poland, located in a company developing new instruments, producing, selling them and conducting their service in all over the world. Thanks to this location, the laboratory is able to provide their services not only in Poland but also abroad, which could affect revenues. In the paper laboratory equipment is presented and the innovative ways to increase measurement throughput is discussed. The calibration and measurement capability developed on the basis of uncertainty budgets is given. The activities carried out during the calibration are presented as well as the contents of the first page of the certificate. In the conclusions the strengths of the laboratory are listed.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 8; 250-253
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Certification of Testing Laboratories - The Basis of Reliability Among Research Vendors in Aviation
    Autorzy:
    Wichniarz, Marzena
    Powiązania:
    https://bibliotekanauki.pl/articles/2105192.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    certification
    accreditation
    NADCAP
    ISO/IEC 17025
    standardization
    material test
    standard
    management system
    quality
    laboratory
    validation
    reliability
    Opis:
    Material characterization and assessment is a crucial stage in most of aviation and aeronautical research and a basis for further design and testing of more complex aircraft elements and structures. Material test’s reliability can only be guaranteed by conducting them at independent and reliable laboratories, operating based on a management system assessed by a third-party such as the accreditation according to the ISO / IEC 17025 or NADCAP or having the qualification of the second-party based on specific customer requirements. This paper introduces basic requirements for material testing laboratories according to accreditation systems and describes its responsibilities as qualified and reliable testing suppliers.
    Źródło:
    Fatigue of Aircraft Structures; 2021, 13; 99--105
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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