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Wyświetlanie 1-15 z 268
Tytuł:
Synthesis, properties and applications of graphene oxide: an overview
Autorzy:
Nanda, Saswati
Gaur, Atirek
Duchaniya, Rajendra Kumar
Powiązania:
https://bibliotekanauki.pl/articles/1030153.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Brodie’s method
Graphene Oxide
Hummer’s method
Modified Hummer’s method
Staudenmaier method
Opis:
This paper introduces different methods of synthesis of graphene oxide, properties, and applications of graphene oxide (GO). Unique structural, optical, mechanical, thermal, electrical, barrier properties, excellent biocompatibility Broaden the applications of GO in several fields of science and technology. GO a versatile material is a two-dimensional structure contains oxygen-based functional groups. Hydrophilic nature, Corrosion resistance property of GO makes it a hot area of research in nanocomposite coating fields.
Źródło:
World Scientific News; 2020, 143; 17-27
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regional variety in quality of life in Poland
Autorzy:
Nowak, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/18859984.pdf
Data publikacji:
2018
Wydawca:
Instytut Badań Gospodarczych
Tematy:
quality of life
welfare measures
regional variety
Hellwig’s method
Ward’s method
Opis:
Research background: Quality of life is viewed as the degree of people's satisfaction of various needs, especially including material, spiritual, safety-related needs and life aspirations. The aspects taken into consideration are economic, spatial, environmental and cultural ones. Quality of life is therefore determined by various conditions in which a human lives and the source of which is the hierarchy of needs and a value system. At the same time, quality of life can be viewed in terms of collectivity (objective aspect) and an individual's evaluation (subjective aspect). The former view shapes the existing living conditions and the latter results from the satisfaction from a specific person's life, experiences and ambitions. The multidimensionality of the quality of life categories translates into difficulties in defining and measuring it, and constitutes an interesting research object. Purpose of the article: The purpose of the article is to diagnose and evaluate the variety of the quality of life in Polish voivodeships, in objective terms by building a synthetic measure allowing for estimating inequalities in the quality of life of regional communities. It was assumed that quality of life will be characterised by indicators grouped into the following areas: material living conditions, economic activity, health, education and living environment quality. Methods: The main method used for measuring quality of life is the linear ordering based on Z. Hellwig's taxonomic measure which allows for organising voivodeships in terms of the quality of life of communities. Additionally, the cluster analysis (Ward's agglomerative grouping method) was used, which allowed for distinguishing voivodeships similar in terms of the analysed phenomenon. Findings & Value added: During the realisation of the research goal, special attention was paid to the complexity of the quality of life issue and its measurement in terms of economy and rather important varieties in voivodeships were emphasized. The conducted analysis allowed for distinguishing groups of regions with the highest, high, low and the lowest quality of life.
Źródło:
Oeconomia Copernicana; 2018, 9, 3; 381-401
2083-1277
Pojawia się w:
Oeconomia Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial differentiation in the social and economic development level in Poland
Autorzy:
Miłek, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/22446539.pdf
Data publikacji:
2018
Wydawca:
Instytut Badań Gospodarczych
Tematy:
region
regional development
regional differentiation
Hellwig’s method
Ward’s method
natural breaks classification
Opis:
Research background: Social and economic development involves a broad spectrum of social, economic and spatial phenomena. The multi-faceted nature of regional development arises directly from the fact that it is shaped by multiple factors. Current discourse emphasises the role of endogenous factors, which indicate the specific nature and the distinctive features of the given territory. Mobilising the endogenous potential ensures stable regional development dynamics. At the moment, one of the fundamental economic problems are the increasing differences in the development of specific regions. Purpose of the article: The purpose of this study is to assess the differentiation of the social and economic level development of Polish Voivodeships, applying the selected assessment methods for the years 2010 and 2015, draw up a rank list of regional units according to their development levels, and identify the groups of Voivodeships sharing similar development levels. The indicators used in this study, characterising the level of the social and economic development, have been systematised according to the following areas: demographics and labour market, regional entrepreneurship, local economy structure, innovation and research & development activities, technical infrastructure, social infrastructure, and the condition and protection of the natural environment. Methods: The level of the social and economic development of Polish Voivodeships was assessed using Zdzisław Hellwig's development pattern method, which made it possible to rank them according to the level of development of Polish Voivodeship. The methodology is supplemented by Ward's agglomerative clustering method, which made it possible to distinguish other Voivodeships according to the analysed phenomenon. The Voivodeship clustering method used Jenks' natural breaks classification method. Findings & Value added: Pursuing the research aims, the authors focused in particular on clear spatial differences. Through the analysis we were able to identify the changes in the social and economic development processes of the Polish regions. The Voivodeships were divided into groups according to their development level: the highest, high, low and the lowest.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2018, 13, 3; 487-507
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fast Second Order Original Prony’s Method for Embedded Measuring Systems
Autorzy:
Zygarlicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/221161.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Prony’s method
signal processing
harmonics
measurements
Opis:
The paper presents a method of adaptation of the original second order Prony’s method for applications in lowcost digital measurement systems with low computing performance. The presented method can be used in measuring systems where it is important to obtain in real time the values of amplitude, frequency, initial phase and damping coefficient of a single sinusoidal component of an analysed signal. The paper presents optimized, in terms of the number of mathematical operations, implementation of the method in selected embedded devices as well as the calculation times of the method for each platform.
Źródło:
Metrology and Measurement Systems; 2017, 24, 4; 721-728
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On eigenvectors associated to a multiple eigenvalue
Autorzy:
Cruz-Santiago, R.
López-Bonilla, J.
Vidal-Beltrán, S.
Powiązania:
https://bibliotekanauki.pl/articles/1177790.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Eigenvalue problem
Faddeev-Sominsky’s technique
Gower’s method
Opis:
If all roots of the characteristic polynomial of a matrix have distinct values, then the Faddeev-Sominsky’s algorithm gives the corresponding eigenvectors. Here we exhibit the method of Gower to construct the proper vectors associated to a multiple eigenvalue.
Źródło:
World Scientific News; 2018, 100; 248-253
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wielowymiarowa analiza porównawcza jako narzędzie oceny spółek deweloperskich notowanych na GPW
Multivariate comparative analysis as a toolto evaluate the development of companies listed on the Warsaw Stock Exchange
Autorzy:
Chrzanowska, Mariola
Zielińska-Sitkiewicz, Monika
Powiązania:
https://bibliotekanauki.pl/articles/425133.pdf
Data publikacji:
2013
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
Ward’s method
k-means method
Polish developer companies
Opis:
The diversity and multiplicity of information associated with investment in the stock market can cause problems with the proper understanding of the analyzed phenomena. In particular it refers to small investors who invest directly in stocks. Therefore, evaluating the financial condition of listed companies is very important, hence the need to use methods that will simplify and thus make stock market analysis easier. This paper presents an attempt to apply the selected financial ratios for the classification of 17 real estate companies listed on the Warsaw Stock Exchange into groups characterized by a similar economic condition. In the study multidimensional comparative analysis was used, i.e. Ward’s method and the method of k-means. The analysis was carried out in the period 2010-2012. In the experiment it was proved that using Ward’s method could identify companies with the weakest condition.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2013, 4(42); 60-71
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Radiation Efficiency Measurements of Real System of a Thin Circular Plate Embedded Into a Thick Square Baffle
Autorzy:
Szemela, K.
Rdzanek, W. P.
Żyłka, W.
Powiązania:
https://bibliotekanauki.pl/articles/176336.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
radiation efficiency
measurements
Hashimoto’s method
coupled plates
Opis:
Most of sound sources are complex vibroacoustic objects consist of numerous elements. Some coupled vibrating plates of different shapes and sizes can be easily found in urban environments. The main aim of this study is to determine the sound radiation of coupled plates system of practical importance. The investigated vibroacoustic system consist of a thin circular plate coupled with a thick flat baffle with a circular hole. The circular plate has been mounted to the baffle’s hole using screws and two steel rings. The measurement setup was located inside a semi-anechoic chamber to assure the free field conditions. It was necessary to take into account the whole system surface to obtain the radiation efficiency based on the Hashimoto’s method. Such an approach can be troublesome and time-consuming. Therefore, the criterion has been proposed which allows the vibration velocity measurements and calculations to be performer only for the thin plate’s area. An alternative approach has been proposed based on the classical Rayleigh integral formula. Its advantage is a simpler implementation in a computer code. The obtained results have been compared with the theoretical results obtained for the elastically supported circular plate. A good agreement has been obtained at low frequencies.
Źródło:
Archives of Acoustics; 2018, 43, 3; 413-423
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Low- and High-Frequency Side Bands of Notched Noise on Masking and Auditory Filter Shape at Very High Frequencies
Autorzy:
Kordus, M.
Kowalewski, B.
Powiązania:
https://bibliotekanauki.pl/articles/177387.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
auditory filters
notched noise
Patterson’s method
masking
Opis:
This paper is concerned with the determination of the auditory filter shape using the notched noise method with noise bands symmetrically located above and below a probe frequency of 10 kHz. Unlike in the classical experiments conducted with the use of Patterson method the levels as well as power spectrum densities of the lower and upper component bands of the notched noise masker were not the same and were set such as to produce the same amount of masking at the 10-kHz frequency. The experiment consisted of three conditions in which the following values were determined: (I) the detection threshold for a 10-kHz probe tone in the presence of a noise masker presented below the tone’s frequency; (II) the level of a noise masker presented above the 10-kHz probe tone frequency, at which the masker just masked the probe tone, (III) the detection threshold for a probe tone in the presence of a notched-noise masker. The data show a considerable amount of variability across the subjects, however, the resulting frequency characteristics of the auditory filters are consistent with those presented in the literature so that the Equivalent Rectangular Bandwidth is less than 11% of their centre frequency.
Źródło:
Archives of Acoustics; 2015, 40, 3; 329-336
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effects of Implementing 5S as the Foundation for Work Improvement on the Workplace
Autorzy:
Bartnicka, C.
Powiązania:
https://bibliotekanauki.pl/articles/2064934.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
5S method
work optimization
improvement of processes
Opis:
The article presents the main aspects which require attention when optimizing and improving the manufacturing process, i.e.: the human resources aspect, the technical aspect and the organizational aspect. Concepts such as the Total Quality Management, Six Sigma or Lean Manufacturing claim that work improvement should be a continuous process. The foundation for implementing the improvement of processes, regardless of the concept, are well-organized and orderly workplaces as well as standardization, which can be achieved thanks to the Japanese 5S method.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 451--455
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bariery i ograniczenia przy wdrożeniu metody 6S: studium przypadku
Barriers and limitations at the implementation of the 6S method: a case study
Autorzy:
Konieczka, Kinga
Konieczna, Monika
Powiązania:
https://bibliotekanauki.pl/articles/202750.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
metoda 6S
jakość
zarządzanie
6S method
quality
management
Opis:
W artykule opisano praktyczne aspekty jakości. Metoda ta jest częścią dobrego zarządzania i ma zastosowanie na stanowiskach pracy w wielu firmach produkcyjnych. Jej nazwa pochodzi od pierwszych liter pięciu japońskich słów, które można przetłumaczyć jako selekcja, systematyka, sprzątanie, schludność i samodyscyplina oraz dodanej szóstej składowej – bezpieczeństwo – safety. Celem artykułu jest zaprezentowanie, na podstawie wyników badań, ograniczeń i barier występujących w trakcie wdrażania koncepcji 6S, aby doskonalić procesy i poprawić bezpieczeństwo na stanowiskach pracy.
The article contains practical elements of the implementation of the 6S method in a production enterprise as an element of quality improvement. This method is one of the elements of good management and is applicable at workplaces in many production companies. Its name comes from the first letters of five Japanese words, which can be translated as selection, systematics, cleaning, neatness and self-discipline, and added sixth component – safety. The aim of the article is to present, on the basis of research results, limitations and barriers occurring during the implementation of the 6S concept, to improve processes and safety at workplaces.
Źródło:
Zeszyty Naukowe Politechniki Poznańskiej. Organizacja i Zarządzanie; 2019, 79; 119-131
0239-9415
Pojawia się w:
Zeszyty Naukowe Politechniki Poznańskiej. Organizacja i Zarządzanie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solving Hexagonal Intuitionistic Fuzzy Fractional Transportation Problem Using Ranking and Russell’s Method
Autorzy:
Anju, A.
Powiązania:
https://bibliotekanauki.pl/articles/1062797.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Fractional Transportation Problem
Intuitionistic Fuzzy
Ranking Method
Russell’s Method
Opis:
This paper presents a solution for fractional transportation problem in an intuitionistic fuzzy environment in which cost are represented by hexagonal intuitionistic fuzzy numbers. Fuzzy fractional transportation is a special kind of optimization problem which is associated with our day to day activities. An optimal solution is found out to show the effectiveness of this method. In this, the problem is solved using ranking and Russell’s method for hexagonal intuitionistic fuzzy numbers. An illustrative example is provided to demonstrate the feasibility of this method.
Źródło:
World Scientific News; 2019, 133; 234-247
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of parameters of Tömquist’s functions with Newton-Raphson’s method
Szacowanie parametrów funkcji Törnquista metoda Newtona-Raphsona
Autorzy:
Mantaj, Andrzej
Wagner, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/907038.pdf
Data publikacji:
2008
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Tömquist’s functions
Newton-Raphson’s method
estimation of parameters
Opis:
In the work there has been discussed Newton-Raphson’s iterative method of estimation of parameters of Tömquist’s functions of general class and there are derived formulas of their partial derivatives of Ist and 2nd rank. It enabled presentation of uniform form of the vector of parameters of successive iterative approximations allowing their implementation in Excel calculation sheet.
Dla wyznaczania parametrów funkcji Törnquista proponowanych jest wiele metod, wśród nich metody linearyzacji. Są one jednak mało efektywne, aczkolwiek stanowią dobre przybliżenia początkowe parametrów do zastosowania metody Newtona-Raphsona. W tych sytuacjach rozwiązania optymalne najczęściej uzyskuje się już po kilku krokach iteracyjnych. Rozważania przeprowadzone w pracy dotyczyły jednej ogólnej postaci dla wszystkich trzech typów funkcji Törnquista. Umożliwiło to podanie jednolitych wzorów na pochodne cząstkowe względem parametrów funkcji kryterialnej, a jednocześnie pozwoliło na sformułowanie ogólnej postaci wektora przybliżeń w metodzie Newtona- Raphsona.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2008, 216
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Segmentacja facebookowiczów - ujęcie ilościowe
Segmentation of Facebook users – quantification
Autorzy:
Czerska, Iwona
Powiązania:
https://bibliotekanauki.pl/articles/419807.pdf
Data publikacji:
2015
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
segmentation
Facebook users
Ward’s method
k-means method
segments profiling
Opis:
The purpose of this study is the statistical analysis of results of the online survey in order to make market segmentation of Facebook users. Non-random sampling methods were used: convenience sampling and snowball sampling method. Because the sample was not representative, it did not give rise to statistical inferences about the population of Facebook users. The survey results were only part of the initial diagnosis, a description of the existing state of affairs. On the basis of selected market segmentation criteria and using the generalized k-means clustering algorithm and the Ward agglomeration method three clusters were formed: “Informed over-cautious persons” (56,31% of the sample), “Committed risktakers” (20,39% of the sample) and “Persistent assertive people” (23,30% of the sample). Segments were profiled on the basis of psychographic and behavioral criteria. The statistical significance of the relationship between clusters of Internet users and individual variables was confirmed by the chi-square test.
Źródło:
Nauki o Zarządzaniu; 2015, 3 (24); 33-40
2080-6000
Pojawia się w:
Nauki o Zarządzaniu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The spatial distribution of probable maximum precipitation (PMP) over the Kielce Upland in one day and multi-day intervals
Autorzy:
Suligowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/108508.pdf
Data publikacji:
2013
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
Probable Maximum Precipitation
PMP
Kielce Upland
Hershfield’s method
Opis:
This paper presents an attempt to estimate the value of Probable Maximum Precipitation (PMP) over the Kielce Upland for one-day and multi-day intervals. Statistical methods were employed in the calculations. Precipitation data were obtained from 23 gauging stations. A regional frequency factor km (from Hershfield’s formula) was calculated for each station based on a series of maximum annual precipitation totals from 1961 to 2006. The calculated PMP values range from 120.7 mm to 228.4 mm (within the 1-day precipitation group), from 140.7 mm to 266.3 mm (2-day group), from 158.9 mm to 294.1 mm (3-day group), and from 175.2 mm to 294.8 mm (4-day group). These values became reference values used to show the spatial distribution of PMP throughout the Kielce Upland region.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2013, 1, 1; 39-44
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detonation parameters of mixtures containing ammonium nitrate and aluminium
Autorzy:
Zygmunt, B.
Powiązania:
https://bibliotekanauki.pl/articles/358910.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
ammonium nitrate based mixtures
detonation parameters
Dremin’s method
Opis:
Ammonium nitrate (AN) is the most popular ingredient of commercial explosives. Pure AN is not treated as an explosive compound but a slight organic or inorganic addition makes the mixture capable of explosion. In the paper the experimental tests were focused on aluminium (Al) as the most effective sensitizer. Mixture of AN or water solution AN with aluminium (ammonals and hydro-ammonals) were studied. Using electromagnetic method of measuring of the mass velocity behind the detonation wave front (Dremin’s method), detonation parameters as well the shape of detonation waves in explosive mixtures were determined. The essential factor influencing the detonation parameters of the studied explosives is their physical structure.
Źródło:
Central European Journal of Energetic Materials; 2009, 6, 1; 57-66
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 268

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