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Wyświetlanie 1-15 z 57
Tytuł:
Surface irregularities as a complex signal of tool representation together with uneven displacement in respect to the workpiece
Autorzy:
Boryczko, A.
Rytlewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/221576.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface irregularities
surface profile
tool profile
surface disturbances
tool displacements
Opis:
In a dynamic machining process, distortion in surface irregularity is a very complex phenomenon. Surface irregularities form a periodic representation of the tool profile with various kinds of disturbance in a broad range of changes in the height and length of the profile. To discern these irregularity disturbances, interactions of the tool in the form of changes perpendicular and parallel relative to the workpiece were analyzed and simulated. The individual kinds of displacement of the tool relative to the workpiece introduce distortions in the changes of height and length. These changes are weakly represented in standard height and length irregularity parameters and their discernment has been found through amplitude-frequency functions.
Źródło:
Metrology and Measurement Systems; 2014, 21, 1; 133-144
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Materials education: now and in the future
Autorzy:
Goodhew, P.
Bullough, T.
Taktak, D.
Powiązania:
https://bibliotekanauki.pl/articles/200043.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
materials education
teaching
subject profile
UKCME
Opis:
The state of education in materials science in the UK is reported, based on a National Subject Profile developed by the UK Centre for Materials Education. The curriculum content and methods of teaching are reviewed, and compared with the results of the largest ever education survey of materials scientists at Euromat 2009. A wide range of national opinions are presented, but the overall state of materials education in Europe is concluded to be very healthy.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 2; 295-302
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of deviations of cylindrical surfaces with the use of wavelet transform
Autorzy:
Stępień, K.
Makieła, W.
Powiązania:
https://bibliotekanauki.pl/articles/220818.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wavelet transform
cylindricity profile
decomposition
approximation
Opis:
Wavelet transform becomes a more and more common method of processing 3D signals. It is widely used to analyze data in various branches of science and technology (medicine, seismology, engineering, etc.). In the field of mechanical engineering wavelet transform is usually used to investigate surface micro- and nanotopography. Wavelet transform is commonly regarded as a very good tool to analyze non-stationary signals. However, to analyze periodical signals, most researchers prefer to use well-known methods such as Fourier analysis. In this paper authors make an attempt to prove that wavelet transform can be a useful method to analyze 3D signals that are approximately periodical. As an example of such signal, measurement data of cylindrical workpieces are investigated. The calculations were performed in the MATLAB environment using the Wavelet Toolbox.
Źródło:
Metrology and Measurement Systems; 2013, 20, 1; 139-150
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation Of Non-Periodic And Periodic 2D Profile Features Using B-Spline Functions
Autorzy:
Janecki, D.
Cedro, L.
Zwierzchowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/221820.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
profile filtering
B-spline functions
roundness
roughness
Opis:
The form, waviness and roughness components of a measured profile are separated by means of digital filters. The aim of analysis was to develop an algorithm for one-dimensional filtering of profiles using approximation by means of B-splines. The theory of B-spline functions introduced by Schoenberg and extended by Unser et al. was used. Unlike the spline filter proposed by Krystek, which is described in ISO standards, the algorithm does not take into account the bending energy of a filtered profile in the functional whose minimization is the principle of the filter. Appropriate smoothness of a filtered profile is achieved by selecting an appropriate distance between nodes of the spline function. In this paper, we determine the Fourier transforms of the filter impulse response at different impulse positions, with respect to the nodes. We show that the filter cutoff length is equal to half of the node-to-node distance. The inclination of the filter frequency characteristic in the transition band can be adjusted by selecting an appropriate degree of the B-spline function. The paper includes examples of separation of 2D roughness, as well as separation of form and waviness of roundness profiles.
Źródło:
Metrology and Measurement Systems; 2015, 22, 2; 289-302
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SVC placement for voltage constrained loss minimization using self-adaptive Firefly algorithm
Autorzy:
Selvarasu, R.
Kalavathi, M. S.
Rajan, C. Ch. A.
Powiązania:
https://bibliotekanauki.pl/articles/140931.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Firefly algorithm
loss minimization
SVC
voltage profile
Opis:
Static Var Compensator (SVC) is a popular FACTS device for providing reactive power support in power systems and its placement representing the location and size has significant influence on network loss, while keeping the voltage magnitudes within the acceptable range. This paper presents a Firefly algorithm based optimization strategy for placement of SVC in power systems with a view of minimizing the transmission loss besides keeping the voltage magnitude within the acceptable range. The method uses a self-adaptive scheme for tuning the parameters in the Firefly algorithm. The strategy is tested on three IEEE test systems and their results are presented to demonstrate its effectiveness.
Źródło:
Archives of Electrical Engineering; 2013, 62, 4; 649-661
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modified Bohm’s theory for abstruse measurements: application to layer depth profiling using auger spectroscopy
Autorzy:
Rówiński, E.
Pietruszka, M.
Powiązania:
https://bibliotekanauki.pl/articles/354547.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
carbon desorption
depth profile
layers
NiTi
oxygen adsorption
Opis:
Modified Bohm’s formalism was applied to solve the problem of abstruse layer depth profiles measured by the Auger electron spectroscopy technique in real physical systems. The desorbed carbon/passive layer on an NiTi substrate and the adsorbed oxygen/surface of an NiTi alloy were studied. It was shown that the abstruse layer profiles can be converted to real layer structures using the modified Bohm’s theory, where the quantum potential is due to the Auger electron effect. It is also pointed out that the stationary probability density predicts the multilayer structures of the abstruse depth profiles that are caused by the carbon desorption and oxygen adsorption processes. The criterion for a kind of break or "cut" between the physical and unphysical multilayer systems was found. We conclude with the statement that the physics can also be characterised by the abstruse measurement and modified Bohm’s formalism.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 175-180
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical and Laboratory Tests of Aluminum Profile Connection Using the "Popular Lock"
Autorzy:
Golewski, P.
Sadowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/356834.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bolt-channel
numerical simulation
popular lock
aluminium profile
Opis:
Aluminum profiles play an important role in civil engineering (facades, walls with windows) as well as in mechanical engineering (production lines, constructions of 3D printers and plotters). To ensure quick assembly, disassembly or changed the dimensions of constructions it is not possible to use such methods as welding, adhesive or riveting joints. The solution may be to use the so-called "popular lock”. It is a mechanism, the closure of which is caused by tightening of the conical screw, joining the "T" profile in the node. In order to properly design using the presented type of connection, it is necessary to know its strength and stiffness both in simple and complex loads states, also including imperfections. In the literature there is no information about the operation of the construction node with the so-called "popular lock”. The paper presents the results of experimental tests for connections subjected to uniaxial tensile test, paying special attention to the defects that may appear during the assembly. In the next step, a 3D solid connection model was created. Numerical simulations were performed in the Abaqus / Explicite program for both uniaxial tensile test and bending tests in two planes. Limit values of loads above which there is a plastic deformation of the material were determined. Determination of stiffness and strength of a single node allowed to make a simplified connector model. Using the numerical model, the analysis was performed taking into account the influence of imperfections on the work of the entire connection.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 339-346
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A review of digital filtering in evaluation of surface roughness
Autorzy:
He, Baofeng
Zheng, Haibo
Ding, Siyuan
Yang, Ruizhao
Shi, Zhaoyao
Powiązania:
https://bibliotekanauki.pl/articles/1849137.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface roughness
profile filtering
areal filtering
surface engineering
Opis:
Surface roughness is an important indicator in the evaluation of machining and product quality, as well as a direct factor affecting the performance of components. A rapidly developing filtering technology has become the main means of extracting surface roughness. The International Organization for Standardization (ISO) is constantly updating and improving the standard system for filtering technology in order to meet the requirements of technological development. Based on the filters already accepted by the international standard ISO 16610, this study briefly introduces the filtering principle of each filter, reviews the development of each filter in the application of surface roughness, and compares the advantages and limitations of their individual performances. The application range of each filter is summarized and, finally, the future direction of the digital filtering used in surface roughness is extrapolated.
Źródło:
Metrology and Measurement Systems; 2021, 28, 2; 217-253
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Open-Path FTIR Spectral Radiation Intensity Of Hot Combustion Gases – Measurement And Interpretation
Autorzy:
Cięszczyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/221668.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spectral remote sensing
temperature profile
hot gas
FTIR
Opis:
Spectral remote sensing is a very popular method in atmospheric monitoring. The paper presents an approach that involves mid-infrared spectral measurements of combustion processes. The dominant feature in this spectral range is CO2 radiation, which is used to determine the maximum temperature of nonluminous flames. Efforts are also made to determine the temperature profile of hot CO2, but they are limited to the laboratory conditions. The paper presents an analysis of the radiation spectrum of a non-uniform-temperature gas environment using a radiative transfer equation. Particularly important are the presented experimental measurements of various stages of the combustion process. They allow for a qualitative description of the physical phenomena involved in the process and therefore permit diagnostics. The next step is determination of a non-uniform-temperature profile based on the spectral radiation intensity with the 8 m optical path length.
Źródło:
Metrology and Measurement Systems; 2015, 22, 2; 193-204
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the correlation between virulence factors and genotypic profiles of Candida albicans isolated from turkeys
Autorzy:
Sokół, I.
Gaweł, A.
Bobrek, K.
Powiązania:
https://bibliotekanauki.pl/articles/2087778.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Candida albicans
turkeys
genotypic profile
RAPD
proteinase
haemolysin
phospholipase
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 1; 29-33
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cognitive Grammar tools in teaching English tenses - the case of present perfect
Autorzy:
Drożdż, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/577066.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
profile
base
Cognitive Grammar
Present Perfect
foreign language teaching
Opis:
The article discusses an application, within the sphere of foreign language pedagogy, of one of the psychological mechanisms omnipresent in language – construal (Langacker 2008: 4-5, Tomasello 2003: 13). In the first part, the article takes up two major issues: a more detailed characterization of the construal aspects in question: profile and base, as well as the problems often encountered in pedagogical grammar while referring to the uses of one of the English tenses – Present Perfect: the number of uses, the manner of defining them, and the level of schematicity at which the description should take place. The second part of the article is devoted to an analysis of the uses of Present Perfect by means of the presented Cognitive Grammar tools. In the conclusions this analysis is reviewed from the perspective of the above-mentioned problems and some pedagogical implications flowing from the model proposed by the author are discussed.
Źródło:
Linguistica Silesiana; 2011, 32; 213-228
0208-4228
Pojawia się w:
Linguistica Silesiana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Narodziny kierunku i początki kształcenia w zakresie gospodarki przestrzennej w Uniwersytecie im. Adama Mickiewicza w Poznaniu
The Birth and Beginning of Spatial Management Education in Adam Mickiewicz University in Poznań
Autorzy:
Parysek, J.
Powiązania:
https://bibliotekanauki.pl/articles/2031721.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
birth and beginning of education
education
educational profile
spatial management
Opis:
The content of the presented paper consists a short reconstruction of the genesis and beginning of educational process in spatial management at the A. Mickiewicz University in Poznań. It is kind of personal reflection on this initial period, made by a person taking part in this project from the beginning until now. Both reconstruction and reflection have, of course, subjective character and have been made from the perspective of 25 years of asctivity. Particular attention is devoted to the origins of education, the struggle for recognition of spatial management, as a direction of study, the supplementation of the education profile and “values added” carried out activity.
Źródło:
Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN; 2017, 266; 11-28
0079-3493
Pojawia się w:
Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison between profile and areal surface roughness parameters
Autorzy:
He, Baofeng
Ding, Siyuan
Shi, Zhaoyao
Powiązania:
https://bibliotekanauki.pl/articles/1849053.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
profile surface roughness
areal surface roughness
filtration techniques
evaluation parameters
Opis:
Surface roughness has an important influence on the service performance and life of parts. Areal surface roughness has the advantage of accurately and comprehensively characterizing surface microtopography. Understanding the relationship and distinction between profile and areal surface roughness is conducive to deepening the study of areal surface roughness and improving its application. In this paper, the concepts, development, and applications of surface roughness in the profile and the areal are summarized from the aspect of evaluation parameters. The relationships and differences between surface roughness in the profile and the areal are analyzed for each aspect, and future development trends are identified.
Źródło:
Metrology and Measurement Systems; 2021, 28, 3; 413-438
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison between profile and areal surface roughness parameters
Autorzy:
He, Baofeng
Ding, Siyuan
Shi, Zhaoyao
Powiązania:
https://bibliotekanauki.pl/articles/1849106.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
profile surface roughness
areal surface roughness
filtration techniques
evaluation parameters
Opis:
Surface roughness has an important influence on the service performance and life of parts. Areal surface roughness has the advantage of accurately and comprehensively characterizing surface microtopography. Understanding the relationship and distinction between profile and areal surface roughness is conducive to deepening the study of areal surface roughness and improving its application. In this paper, the concepts, development, and applications of surface roughness in the profile and the areal are summarized from the aspect of evaluation parameters. The relationships and differences between surface roughness in the profile and the areal are analyzed for each aspect, and future development trends are identified.
Źródło:
Metrology and Measurement Systems; 2021, 28, 3; 413-438
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometric Parameters of Cutting Tools that Can be Used for Forming Sided Surfaces with Variable Profile
Autorzy:
Razumov, M.
Grechukhin, A.
Maslennikov, A.
Powiązania:
https://bibliotekanauki.pl/articles/353373.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
edge surface
polyhedral surfaces
variable profile
payment verification
planetary gear
Opis:
This article describes machining technology of polyhedral surfaces with varying profile, which is provided by planetary motion of multiblade block tools. The features of the technology and urgency of the problem is indicated. The purpose of the study is to determine the minimum value of the clearance angle of the tool. Also, the study is carried out about changing the value of the front and rear corners during the formation of polygonal surface using a planetary gear. The scheme of calculating the impact of various factors on the value of the minimum clearance angle of the tool and kinematic front and rear corners of the instrument is provided. The mathematical formula for calculating the minimum clearance angle of the tool is given. Also, given the formula for determining the front and rear corners of the tool during driving. This study can be used in the calculation of the design operations forming multifaceted external surfaces with a variable profile by using the planetary gear.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 33-40
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 57

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