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Wyświetlanie 1-15 z 142
Tytuł:
Measurement techniques used for analysis of the geometric structure of machined surfaces
Autorzy:
Niemczewska-Wójcik, M.
Mathia, T.
Wójcik, A.
Powiązania:
https://bibliotekanauki.pl/articles/406956.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface metrology
measurement techniques
SGS analysis
Opis:
The quality of machined surfaces, resulting from the manufacturing process and conditioning their functionality, is determined by the surface geometric structure (SGS). There is a close relationship between surface properties, shape, qualitative imagining of the surface topography, technique and technology employed for machining purposes [1, 2]. If a given surface is to have practical applications in engineering, the correct technological process needs to be chosen. In the paper, various techniques used for measuring the surface geometric structure were described. The results of the study, which were obtained from different measuring devices like Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM) and Optical Interferometer (WLI), were presented. Optical Microscopy (OM) was shown as a helpful device to analyse some aspects of surface topography. Each measuring technique provided different, yet complementary data on the topography of the machined surfaces. Owing to this, a full characterization of the geometric surface structure of the machined surfaces was enabled, including surface properties resulting from the applied technological process. Based on the measurements made, the characteristics of chosen devices (measurement techniques) were defined with an indication of how they can be applied to the analysis of the surface geometric structure (SGS). The devices which are considered to give the best view of examined surfaces and allow a thorough analysis of their irregularities were then indicated.
Źródło:
Management and Production Engineering Review; 2014, 5, 2; 27-32
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Free-Form Surfaces’ Reconstruction Accuracy
Autorzy:
Wójcik, A.
Niemczewska-Wójcik, M.
Sładek, J.
Powiązania:
https://bibliotekanauki.pl/articles/220773.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reverse engineering
accuracy assessment
free-form surface
coordinate measuring machine
radius correction
Opis:
The paper presents the problem of assessing the accuracy of reconstructing free-form surfaces in the CMM/CAD/CAM/CNC systems. The system structure comprises a coordinate measuring machine (CMM) PMM 12106 equipped with a contact scanning probe, a 3-axis Arrow 500 Vertical Machining Center, QUINDOS software and Catia software. For the purpose of surface digitalization, a radius correction algorithm was developed. The surface reconstructing errors for the presented system were assessed and analysed with respect to offset points. The accuracy assessment exhibit error values in the reconstruction of a free-form surface in a range of ± 0.02 mm, which, as it is shown by the analysis, result from a systematic error.
Źródło:
Metrology and Measurement Systems; 2017, 24, 2; 303-312
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Product quality assessment – measurement and analysis of surface topography
Autorzy:
Niemczewska-Wójcik, M.
Sładek, J.
Tabaka, M.
Wójcik, A.
Powiązania:
https://bibliotekanauki.pl/articles/220537.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface metrology
topography
measurement devices
analysis of defects
quality
Opis:
This paper concerns the issues of measurement techniques, analysis and assessment of the machined surface geometric structure. The aim of this work was to show the application of surface analysis in diagnosing the causes of discrepancies occurring in the manufacturing process, which may result from ill-matched (poorly fitting) process parameters. An appropriate system of control and interpretation of results may allow early reaction to unfavorable trends (for example blunting of the tool) and prevention of undesirable defects. The subject of research was a waste basket used in the construction of retaining sewer systems. In this paper, the quality of the waste basket as well as its manufacturing process were analyzed and assessed. The research was carried out with the use of three measurement stands, i.e. optical microscopy (OM), scanning electron microscopy (SEM) and white light interferometer (WLI). The surface analysis proved to be important from the viewpoint of outlining the production process as well as improving the product quality. The software used for topographical analysis appeared to be significant for the success of the analysis, providing notable economic effects, namely the lack of defects.
Źródło:
Metrology and Measurement Systems; 2014, 21, 2; 271-280
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Innowacje w przemianach organizacyjno-przestrzennych sadownictwa rejonu grójeckiego
Autorzy:
Traczyk, Anna
Wójcik, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2026714.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Studia komitetu przestrzennego zagospodarowania kraju PAN; 2016, 173; 41-50
0079-3507
Pojawia się w:
Studia komitetu przestrzennego zagospodarowania kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Press studies in Toruńskie Studia Bibliologiczne, Vol. 1–8 (2008–2015)
Autorzy:
Wójcik, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/421625.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
review
recenzje
Opis:
Review of book: Press studies in Toruńskie Studia Bibliologiczne, Vol. 1–8 (2008–2015)
Źródło:
Rocznik Historii Prasy Polskiej; 2016, 19, 4
1509-1074
Pojawia się w:
Rocznik Historii Prasy Polskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Psychologically based, anti-prejudice educational intervention – project
Autorzy:
Popiołek, Katarzyna
Wójcik, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/951978.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stereotypes
prejudice
categorization
identity
ingroup
outgroup
Opis:
The presented study explores the possibility of creating and implementing educational program which would reduce intergroup bias in realistic high school setting. The project was based on the assumption that there is the need of easily applicable, anti-prejudice intervention, which would be appropriate to introduce into foreign language course books, would be universal in terms of changing negative attitudes and would meet all methodological requirements of language lessons. Crossed categorization and the common ingroup identity model were used as theoretical basis for 30 English lesson scenarios on B2 level (upper-intermediate). It was shown that after the intervention there was a signifi cant change in the students’ attitude toward the outgroup and the outgroup members. The implications of these fi ndings are discussed.
Źródło:
Polish Psychological Bulletin; 2012, 43, 4; 223-232
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport induced inflammatory responses in horses
Autorzy:
Wessely-Szponder, J.
Belkot, Z.
Bobowiec, R.
Kosior-Korzecka, U.
Wojcik, M.
Powiązania:
https://bibliotekanauki.pl/articles/30538.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Deleterious response to road transport is an important problem in equine practice. It determines different physiological, immunological and metabolic changes which lead to increased susceptibility to several disorders such as pneumonia, diarrhea, colics, laminitis, injuries and rhabdomyolisis. The aim of our study was to look for possible relationships between transportation of female young and older horses over a long and short distance and an inflammatory state reflected by an increase of acute phase protein concentration, oxidative stress and muscle injury. The study was conducted on 24 cold-blooded female horses divided into four groups. Six fillies aged 6-18 months and six mares aged 10-12 years were transported over the distance of about 550 km, six fillies aged 6-18 months and six mares aged 10-12 years were transported over the distance of about 50 km. Plasma and serum were obtained from blood samples taken before transportation (T0), immediately after transportation (T1) and at an abattoir during slaughter (T2). In these samples fibrinogen, MDA, AST and CK were assessed. Fibrinogen increased in all studied groups especially in fillies after long distance transportation, where it reached 205±7.07 mg/dl before transportation, 625±35.35 mg/dl after transportation, and 790±14.14 mg/dl during slaughter. MDA concentrations rose after transportation and reached the maximal level during slaughter. CK activity was more elevated after short transportation in younger horses, whereas initial activity of AST was higher in older horses. We estimated that intensified responses from acute phase, oxidative stress and muscle injury parameters indicated an inflammatory state.
Źródło:
Polish Journal of Veterinary Sciences; 2015, 18, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measuring internal spelling variation of an Early Modern English text
Autorzy:
Wójcik, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2054312.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spelling variation
early print
cosine distance
compositor
Opis:
The history of English spelling is an eventful one, from Old English with an almost one‑to‑one sound‑to‑spelling relationship, to Modern English, notorious for its sound‑to‑spelling unpredictability. In between lies a vast period characterised by immense spelling variability, reflecting the cumulative effect of dialectal variation and lack of uniformity, additionally compounded by the mode of text transmission in the manuscript culture, whose characteristics were adopted in a wholesale fashion into the culture of early print. In effect, early printed books present a rich kaleidoscope of spelling variants, which – not infrequently – co‑occur on the same page or even in the same line of a printed text. This paper addresses the issue of this variability with a view to measuring in mathematical terms the degree of internal spelling variation within a text and showing that much of the spelling variation is associated with compositors as agents in the printing process. The analysis of internal spelling variation is based on George Joye’s 1534 English translation of the Psalms printed in Antwerp and aims at identifying parts of the text which are similar or different in terms of spellings by applying cosine similarity measurements performed on individual quires of the publication.
Źródło:
Linguistica Silesiana; 2021, 42; 107-123
0208-4228
Pojawia się w:
Linguistica Silesiana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relief and Quaternaryof the southern Sörkapp Land, Spitsbergen
Autorzy:
Wójcik, Antoni
Ziaja, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/2052730.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
Quaternary
landscape
marine terraces
glaciers
Źródło:
Polish Polar Research; 1993, 14, 3; 293-308
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ground temperature of main ecotopes of Kaffiöyra, Spitsbergen, summer 1978
Autorzy:
Wójcik, Gabriel
Marciniak, Kazimierz
Powiązania:
https://bibliotekanauki.pl/articles/2053278.pdf
Data publikacji:
1987
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
climatology
thermal conditions
Źródło:
Polish Polar Research; 1987, 8, 1
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 142

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