Wyniki wyszukiwania - Biblioteka Nauki

1

Influence of the type of adhesive on the properties of the GFRP composite adhesive joint, determined on the basis of the static T-peel test

100%

Kubit A. , Katrňák T. , Pytlowany T.

Advances in Materials Science

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2021

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tom Vol. 21, nr 3(69)

63--74

EN

The article presents the results of experimental studies determining the influence of the type of adhesive on the static strength properties of the Glass Fiber Reinforced Polymer (GFRP) composite joint determined on the basis of the T-peel test. As part of the static tests on peeling joints, a comparison of peak load and stiffness for individual joints was made. The fracture surfaces were also analyzed, showing various failure mechanisms. It was shown that the variant of joints made with the Enguard BP72A polyester adhesive was characterized by the highest strength properties with a mean peak load of 836.73 N.

2

Random errors in analysis of population growth

100%

Kopociński B.

Roczniki Polskiego Towarzystwa Matematycznego. Seria 3: Matematyka Stosowana

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1999

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tom [Z] 41

7-19

EN

The model of bacteria population growth in terms of the logistic equation is considered assuming the plate dilution technique of viable counting in the experiment and random errors in data. For example the Fisher test states that the growth equation and the standard descriptions of the random errors are rejected. The extended analysis of errors is presented in terms of an operator which enables to separate three types of random elements: the stochastic growth, errors of dilutions and sampling. On the basis of the triple repetition of observations the variance of dilution errors is estimated.

3

Metoda FMEA : analiza rodzajów i skutków możliwych błędów

100%

Konstanciak M. , Konstanciak E. , Waszkielewicz W.

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tom Nr 30

211--218

4

Wybrane zagadnienia analizy właściwości dynamicznych akcelerometrów w oparciu o rachunek różniczkowo-całkowy niecałkowitych rzędów

100%

Luft M. , Pietruszczak D. , Szychta E. , Szychta L.

|

2015

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tom R. 22, nr 12

947--952, CD

PL

W artykule przedstawiono badania symulacyjne i laboratoryjne akcelerometru zamodelowanego klasyczną analizą matematyczną oraz wykorzystując rachunek różniczkowo-całkowy niecałkowitych rzędów. Dokonano analizy błędów modeli przetwornika. Wskazano na zalety stosowania rachunku ułamkowego do opisu dynamiki akcelerometrów. Badania symulacyjne wykonano w środowisku programistycznym MATLAB&Simulink.

EN

The paper presents simulation and laboratory stud-ies of measuring transducers (accelerometers) which were modelled in the classical differential equations as well as fractional calculus. Measurement errors are examined and a comparison to classical and fractional models in terms of dynamic properties is made. The advantages of fractional calculus in modelling dynamic elements are also indicated. Tests are executed in the MATLAB&Simulink programme.

5

Analysis of the error caused by possible displacements of the reference axis used for the assessment of geometrical deviations of cylindrical machine elements

100%

Nozdrzykowski K.

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tom R. 58, nr 12

1068-1071

EN

A comprehensive analysis of one component of total error occurring in the determination of geometrical deviations of machine elements set in V-blocks is presented. Analyzed is the error component arising due to possible displacement of the reference axis adopted for the assessment of geometrical deviations, reference axis position in particular. Changes in the position of that axis may result form displacements of measured roundness profile centres that define the reference line. The analysis also allowed to determine the relative error values of the determined deviation of axis position resulting from changes in reference axis position.

PL

W artykule przedstawiona została analiza jednej ze składowych sumarycznego błędu wyznaczania odchyłek geometrycznych części maszyn bazowanych w pryzmach. Przedstawiona analiza jest częścią szeroko pojętej teoretycznej analizy błędów opracowanej metodyki pomiarów odchyłek geometrycznych zespołu powierzchni cylindrycznych elementów maszyn, które z uwagi na swoje duże gabaryty i masy bazowane są najczęściej w pryzmach. Analizowano składową błędu spowodowaną możliwością zmiany położenia osi odniesienia przyjętej do oceny odchyłek geometrycznych, w szczególności odchyłki położenia osi. Zmiany położenia tej osi wynikać mogą z przemieszczeń środków mierzonych zarysów okrągłości, w oparciu o które wyznaczana jest oś odniesienia. W wyniku przeprowadzonej analizy wyznaczone zostały wielkość pola i granice możliwych przemieszczeń punktu usytuowanego na zmieniającej swoje położenie osi odniesienia, w zależności od zmieniającego również swoje położenie punktu usytuowanego na osi rozpatrywanej powierzchni cylindrycznej. Wymienione punkty określają odległość odpowiadającą (zgodnie z przyjętym kryterium tworzenia elementów odniesienia i sposobem wyznaczania odchyłek geometrycznych) poszukiwanej odchyłce współosiowości. W oparciu o przeprowadzoną analizę określone zostały również wartości błędu względnego wyznaczanej odchyłki położenia osi, wynikającego ze zmian położenia osi odniesienia przyjętej do oceny odchyłek geometrycznych.

6

The New Algorithm for Fast Probabilistic Hypocenter Locations

100%

Dębski W. , Klejment P.

Acta Geophysica

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2016

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tom Vol. 64, no. 6

2382--2409

EN

The spatial location of sources of seismic waves is one of the first tasks when transient waves from natural (uncontrolled) sources are analysed in many branches of physics, including seismology, oceanology, to name a few. It is well recognised that there is no single universal location algorithm which performs equally well in all situations. Source activity and its spatial variability in time, the geometry of recording network, the complexity and heterogeneity of wave velocity distribution are all factors influencing the performance of location algorithms. In this paper we propose a new location algorithm which exploits the reciprocity and time-inverse invariance property of the wave equation. Basing on these symmetries and using a modern finite-difference-type eikonal solver, we have developed a new very fast algorithm performing the full probabilistic (Bayesian) source location. We illustrate an efficiency of the algorithm performing an advanced error analysis for 1647 seismic events from the Rudna copper mine operating in southwestern Poland.

7

Problematyka szyku wyrazów w nauczaniu języka polskiego jako obcego

100%

Stasieczek-Górna M.

Kwartalnik Polonicum

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2017

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nr 24

24-30

EN

The article presents the main thesis and conclusions of the dissertation The Problem of Word Order in Teaching Polish as a Foreign Language. Glottodidactic Implications. The main aim of the dissertation was to determine the extent to which issues concerning word order should become part of the process of teaching Polish as a foreign language. The starting point is a presentation of the current state of research in the field. The analysis and synthesis of hitherto publications serve to highlight the rules regarding word order described in Polish linguistics. The dissertation contains also an attempt to examine whether issues concerning word order are sufficiently taken into account in the process of teaching Polish as a foreign language. The analysis of documents pertaining to the process of teaching Polish as a foreign language served to determine the scope of rules of word ordering which learners are expected to be familiar with at given levels. I show the results of analysis of curricula, course-books for teaching Polish as a foreign language, and grammar compendia intended for foreigners. The purpose of the analysis was to ascertain which information concerning word order are in fact provided to the learners of Polish. The empirical part of the dissertation is devoted to the analysis of mistakes in word order made by foreign speakers. It is preceded by theoretical considerations of the essence of word order errors, and search for criteria according to which a given linear order is considered invalid. The material analyzed in this chapter consists of errors excerpted from written works of learners of all levels and different nationalities. The last part of dissertation consists of implications resulting from the carried out analysis. It contains syllabi of word order issues which should become part of teaching content at given levels.

8

Styki robocze przyczyną destrukcji płaszczy chłodni kominowych

100%

Jamroży Z. , Kędzierski M.

|

1999

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tom nr 2

61-64

9

Wybrane problemy obliczania poprawki densometrycznej

84%

Krawczyk A. J. , Stefaniuk M.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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2000

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tom T. 26, z. 3

397-419

PL

W pracy przedstawiony został sposób obliczania poprawek densometrycznych, korygujących zmiany miąższości kompleksów osadowych wskutek oddziaływania kompakcji grawitacyjnej. Podstawą tego sposobu jest podział ciągłego procesu kompakcji grawitacyjnej na dwie składowe: syngenetyczną i postgenetyczną. Kompakcja syngenetyczna zachodzi w trakcie osadzania się analizowanego kompleksu, postgenetyczna natomiast odnosi się do późniejszego czasu. W rekonstrukcji zmian miąższości kompleksu w czasie geologicznym powinna być uwzględniana tylko poprawka postgenetyczna. Oszacowanie pierwotnych miąższości odbywa się iteracyjnie, drogą kolejnych przybliżeń. Jednak w obliczeniach realizowanych tym sposobem wprowadza się istotne uproszczenia modelu ośrodka geologicznego, które mogą być źródłem błędów. Przeprowadzona analiza wybranych błędów metody wskazuje, że nie są one większe od kilku (2-3) procent. Mogą one być minimalizowane przez dokładniejszy podział analizowanego profilu litologicznego.

EN

The way of computation of density corrections for changes of thickness caused by the influence of gravitational compaction is presented in the paper. The continuous process of gravitational compaction is divided into two phases: syngenetic and postgenetic, as a base of the method. The syngenetic compaction takes place during sedimentation of analysed geological complex, while postgenetic compaction is related to later geological time, after sedimentation of the roof of the complex. The postgenetic correction should be only used for reconstruction of thickness changes during geological time. The primary thickness evaluation is made in iterative way by successive approximations. The substantial simplifications related to the model of geological medium are made using the above method; they can produce some errors. The error analysis made in the paper shows that error of thickness evaluation is not greater than a few (2-3) percent. Then, it can be minimized by accurate dividing of lithological profile.

10

Badanie współczynnika przewodzenia ciepła materiałów do izolacji cieplnej

84%

Miros A.

Materiały Budowlane

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2013

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tom nr 3

91--93

11

System do wspomagania analizy błędów popełnianych przez użytkowników symulatorów maszyn

84%

Kalwasiński D.

Przegląd Mechaniczny

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2017

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tom nr 9

56--58

PL

W artykule przedstawiono system do wspomagania analizy błędów zaistniałych podczas procesu symulacji. System ten opracowany zostanie z wykorzystaniem relacyjnych baz danych i technik obiektowych. W artykule omówiono sposób jego funkcjonowania oraz elementy składowe. Posłuży on do wspomagania pracy instruktorów szkoleniowych w zakresie analizy błędów popełnianych przez uczestników szkolenia prowadzonego z użyciem symulatorów maszyn. W artykule przedstawiono również wstępną procedurę przeprowadzenia badania.

EN

The article presents a conception of a system for support of analysis of failings ensuing in process of simulation. The system will be developed with use of relational databases and object-oriented techniques. In the article anatomy of the system and its components is discussed. The realized system will be used to assist training instructors in the field of analysis of failings made by the users of the machines’ simulators.

12

Numerical stability of the Richardson second order method

84%

Smoktunowicz A. , Wróbel I.

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2005

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tom Vol. 38, nr 1

255--263

EN

In this paper we study numerical properties of the Richardson second order method (RS) for solving a linear system Ax = b, where A € Rnxn is infinitysymmetric and positive definite. We consider the standard model of floating point arithmetic (cf. [6], [7], [11]). We prove that the RS-algorithm is numerically stable. This means that the algorithm computes approximations xk to the exact solution x* = A-1b such that the error limfk||xk - x*ll2 ls of order eMcond(A), where eM is the machine precision and cond(A) = ||A || 2 ||A-1|| denotes the condition number of the matrix A.

13

Podstawowe zasady i nowe możliwości wykorzystywania wyników badań presjometrycznych

84%

Tarnawski M.

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tom Vol. 65, nr 10/2

725--736

EN

This article is an attempt to briefly summarize the achievements of the pressuremeter research methodology and its development paths in over sixty years of its existence. The current rules for the tests execution and interpretation of their results as well as their application in the foundation design and in geological-engineering evaluation of the sites are discussed and subjected to critical analysis. Attention has been drawn to the unique ability to identify and estimate errors that may occur during testing, and the last chapter outlines the prospects for the development of this research technique. The author has also presented his accomplishments, such as the introduction of the concept of maximum and minimum settlement, a new way for determining the creep pressure, and a simplified way of defining the so-called standard settlement. In conclusion, the author has drawn attention to the numerous advantages of the pressuremeter method. These include, in particular, a direct assessment of the two most important characteristics of the soil: strength (bearing capacity) and compressibility, reduction of scale effect and the ability to test the soil at any depth.

14

Analiza błędów w badaniach wojskowych

84%

Spustek H.

Zeszyty Naukowe AON

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2000

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tom nr 2(39)

92-98

EN

The article focuses on the problem to define the value of errors in operational-tactical calculations made with the use of mathematical formulae. Weak points of calculations under analysis have been pointed out. A mathematical apparatus has been used for the description. The aim of the article is to show how dangerous it might be to apply mathematical dependencies indiscriminately. The first part of the article contains the analysis of arithmetic operations errors. The dependencies presented in this part have been subsequently used for the analysis of selected examples. Several types of mathematical dependencies included in instruction concerning basic operational-tactical calculations have been analysed. Conclusions in the final part of the article included hints to be taken into account while creating this type of instruction.

15

Geodezyjne metody oceny przemieszczeń dźwigarów

84%

Gałda M. , Najdecki H. , Pianowski L.

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2000

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tom z. 32[180], cz.1

109-116

EN

The paper presents, elaborated by the authors, new method of measurement using DISTO tool. Geodetic measurements of displacements of objects, and among them of girders and of foundations are realized with method of geometrical levelling for determinations of vertical composition. The work introduces the analysis of select methods of measurements together with utilization obtained of conclusions in practice. The paper presents choice of methods of measurements and initial analysis of errors. Problem of choice of method of measurements has fundamental meaning for correct determinations of composition displacements of points of objects estaminated with recommendation passed expertises. Taking under attention limited accesbility to points of object resulting from local conditiones, one should for every chance to effect of theoretical analysis of possibities of use of different methods of measurements and of tools. Choice of methods of measurements comes out of realization of tests of use of different measuring - technics on building site in period of previous realizations of all assignments. Points are divided on groups favouring these, for of which one should mark compositions of horizontal displacements, vertical composition and their location on foundations or on girders. Initial estimation of conditions of work permited on choice of manners of determination of compositions displacements for every group of control points. Control points should be seated at surface of maximum foreseened displacements. Measuring positions - can be situated at will, under conditions, that are found oneself in vicinity vertical surfaces containing these two control points. Error of measurement of length of section can be estaminated from deviations from average values from series of observation on position and similarly as in case of vertical displacements from function d=f(Delta). Determination composition horizontal comes down to calculation of difference of length of section. Submiting that we allow difference, delta d<0.1 mm and ds<05 m, value of angle has to to be well known with error dBeta < 60cc. Enlargement discenter, ds = 2.00 m, will cause significant enlargement of requirements of exactitude of measurement of angle (+ -15cc). Obtainment required exactitudes of measurement is not stateing, in this example, no problem. Section junctive points are approximately parallel to axis of beams of girders. Measurement lengths these of sections are executed at use of electronic total - station SET6E. Proposed methods of marking of displacements on the base of changes of length of sections this can be use in practice under condition that assurance of simultaneously of inspection of constancy of points of system of reference. Obtained results are completely sufficient for builder's expertise. Results effects of analysis have meaning practical and economic, and they can be of service to optimization of technology of geodetic measurements. Utilization popular and easily accessible tool, which is DISTO, to marking of vertical compositions of displacements and of electronic total - station to marking composition horizontal considerably simplifies course of measurements, shortens time of execution. Use of DISTO to determination of vertical displacements is well-founded when height of points over hall's floor (h>5 m).

16

Poprawne zaprojektowanie i wykonanie izolacji wodochronnych - wiedza a rzeczywistość

84%

Kaliszuk-Wietecka A.

Materiały Budowlane

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2017

|

tom nr 3

2--3

PL

Od kilku lat głównym problemem technicznym napotykanym podczas opracowywania licznych ekspertyz i opinii są nieszczelne izolacje wodochronne w garażach, na tarasach i balkonach. Jest to wynikiem nieprzestrzegania podstawowych, wydawałoby się ogólnie znanych zasad projektowania i wykonywania izolacji. W połączeniu z brakiem wiedzy inwestorów, nieznajomością coraz nowszych materiałów i rozwiązań technicznych oraz nierzetelnością wykonawców prowadzi to do opłakanych skutków.

EN

For several years, the main technical problem encountered in the development of numerous expert opinions are leaky waterproof insulation on the terraces and balconies and in the garages. This is the result of not abided, seemed to be generally, well known principles of design and construction of such insulation. In connection with lack of knowledge of the investors, not enough knowledge of ever new materials or technical solutions, and dishonesty of executor, it leads to deplorable consequences.

17

A study of the SU-22 structure for strength analysis, aerodynamics investigations, flight mechanics and free vibrations

84%

Olejnik A. , Kachel S. , Leszczyński P. , Jarzębiński L.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

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2001

|

tom nr 12

25-34

EN

In the paper a comprehensive method for the reconstruction of the existing aviation structures in a virtual reality is presented. The elaborated techniques can be applied to assessment of the ageing fleet of fixed as well as rotary wing aircraft used by the Polish Air Force. The Russian-made Su-22, the prime attack aircraft of the PAF was selected as a sample for strength evaluations. Generally speaking, it was a very difficult and complex task, because the PAF doesn't have a complete technical documentation and maintenance depot or overhaul technology of the considered aircraft.

18

Uncertainty analysis of the kinetic model of natural gas combustion in IC Engine

84%

Mansha M. , Naqvi J. H.

|

tom Vol. 14, nr 1

1-4

EN

The purpose of this analysis is to determine the uncertainties originating due to the kinetic parameters of the rate of a reaction proposed kinetic model. A kinetic model consisting of 208 reaction steps and 73 species was adopted for analysis. In the required uncertainty analysis, the accuracy of approximate models, generated by the Chemkin 4.1.1 for pollutant species, is determined. The reactions which contribute the uncertainty in the output concentrations of the pollutnats species formed in the combustion chamber were identifi ed. The percentage contribution to the uncertainty in the output concentrations of pollutants were also determined.

19

Analiza wybranych metod pomiaru uchybu rakiety względem celu w punkcie spotkania

84%

Golański P. , Pionka W.

Prace Naukowe Instytutu Technicznego Wojsk Lotniczych. Technika Lotnicza

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2006

|

tom nr 20

31-41

PL

Niniejszy artykuł dotyczy problematyki oceny rakietowych strzelań poligonowych. Jednym z elementów podlegających ocenie jest minimalna odległość rakiety od celu zwana uchybem naprowadzania w punkcie spotkania. W artykule zaproponowano dwie metody pomiaru uchybu: metodę radiolokacyjno-optyczną oraz metodę z celem aktywnym. W pierwszej metodzie zakłada się wykorzystanie stacji naprowadzania rakiet SURN. Druga metoda wymaga budowy urządzenia radiolokacyjnego do pomiaru odległości, które powinno być zainstalowane na pokładzie imitatora celu. W artykule przedstawiono teoretyczne rozważania obydwu metod, skupiając szczególną uwagę na analizie błędów pomiarowych.

EN

The paper deals with some issues of field evaluation of missile launches. The minimum missile-to-target distance, i.e. the so-called guidance error at the point of impact, is one of parameters subjected to evaluation. Two methods have be en suggested to measure this error: the radar-and-optical method and one that employs an active target. The first method assumes the missile guidance station SURN to be used, whereas the second one needs radar distance-measuring de vice to be built in a target drone. Theoretical considerations on both the methods are the core of the paper. Particular attention has been paid to analyses of measuring errors.

20

Metrological analysis of different techniques for measuring interface tension between two fluids based on spinning drop method

84%

Kisil I. , Barna O. , Kuchirka Y.

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

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2016

|

tom nr 3

40--42

EN

The spinning drop method foundations of measuring interface tension between two immiscible liquids are considered. Different techniques of the spinning drop method and their metrology evaluation are compared. The dimensionless parameters of spinning drop are calculated using the fourth-order Runge–Kutta procedure and they are approximated by the seventh-order polynomial dependence. The relative errors of the different techniques and the approximate dependence are obtained.

PL

W artykule rozpatrywane podstawy metody wirującej kropli do pomiaru napięcia powierzchniowego na granicy faz między dwoma nie mieszającymi się cieczami. Porównano różne techniki realizacji tej metody i oceniono ich właściwości metrologiczne. Wykorzystując metodę numeryczną Rungego-Kutty 4 rzędu obliczono bezwymiarowe parametry wirującej kropli i aproksymowano za pomocą wielomianu 7 stopnia. Obliczono błąd względny różnych technik oraz proponowanej przybliżonej zależności.