Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Quantitative analysis" wg kryterium: Wszystkie pola

  Lista filtrów
Wyrównaj
Wyświetlanie 1-25 z 354
Tytuł:
Qualitative and quantitative analysis of tensegrity domes
Autorzy:
Obara, Paulina
Solovei, Maryna
Tomasik, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/2204491.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tensegrity dome
self-stress state
infinitesimal mechanism
geometrical non-linear analysis
kopuła tensegrity
stan samonaprężenia
mechanizm nieskończenie mały
analiza nieliniowości geometrycznej
Opis:
The paper concerns steel domes with regard to the special structures named tensegrity. Tensegrities are characterized by the occurrence of self-stress states. Some of them are also characterized by the presence of infinitesimal mechanisms. The aim of this paper is to prove that only tensegrity domes with mechanisms are sensitive to the change of the level of initial prestress. Two tensegrity domes are considered. In addition, a standard single-layer dome is taken into account for comparison. The analysis is carried out in two stages. Firstly, the presence of the characteristic tensegrity features is examined (qualitative analysis). Next, the behavior under static external loads is studied (quantitative analysis). In particular, the influence of the initial prestress level on displacements, effort, and stiffness of the structure is analyzed. To evaluate this behavior, a geometrically non-linear model is used. The model is implemented in an original program written in the Mathematica environment. The analysis demonstrates that for a dome with mechanisms, the adjustment of pre-stressing forces influences the static properties. It has been found that the stiffness depends not only on the geometry and properties of the material but also on the initial prestress level and external load. In the case of the non-existence of mechanisms, structures are insensitive to the initial prestress level.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 1; art. no. e144574
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Qualitative and quantitative analysis of Baltic phytoplankton pigments
Autorzy:
Ston, J.
Kosakowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/49132.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
pigment
qualitative analysis
sea water
quantitative analysis
photosynthetic carotenoid
Baltic Sea
Gdansk Gulf
phytoplankton
chlorophyll
photoprotecting carotenoid
Opis:
The paper presents the results of research into the pigment composition of seawater samples taken from various depths in the Gulf of Gdańsk in April and September 1999. Pigments were separated by RP–HPLC, and identification was confirmed by co-injection with reference standards and on-line diode array spectra. The following groups of pigments were identified: chlorophylls: a, b, c1 + c2; photosynthetic carotenoids (PSC) – peridinin, fucoxanthin, α-carotene; photoprotecting carotenoids (PPC) – diadinoxanthin, alloxanthin, zeaxanthin, lutein, neoxanthin, violaxanthin and β-carotene. Quantitative and qualitative diversity in pigment characteristics were observed in both seasons, though lutein and α-carotene were not identified in the September samples. The respective April and September concentrations of the functional groups of pigments were: total chlorophylls content 0.47–104.25 and 0.57–13.66 μg dm−3; PSC 0.07–21.23 and 0.02–1.56 μg dm−3; PPC 0.05–14.08 and 0.04–1.79 μg dm−3. Within the PSC group, peridinin and fucoxanthin were dominant in the April samples, but only fucoxanthin in the September ones. Among the PPCs, diadinoxanthin and alloxanthin were dominant in April, zeaxanthin in September. Photosynthetic and photoprotecting carotenoids display a linear correlation with chlorophyll a content in all the samples.
Źródło:
Oceanologia; 2000, 42, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Echinoids as substrates for encrustation : review and quantitative analysis
Autorzy:
Borszcz, T.
Powiązania:
https://bibliotekanauki.pl/articles/191302.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Echinoids
encrustation
Recent
fossil record
patterns
meta-analysis
review
Opis:
The existing literature, including records of both fossil and extant echinoid encrustation, is quantitatively analysed and reviewed. This shows that echinoid encrustation (number of encrusted echinoid taphocoenoses) has increased nearly continuously and dramatically to the present day, as confirmed by linear regression values of more than 85 per cent. It also demonstrates that current levels of echinoid fouling stabilised by the Miocene, while there has been a more or less continuous record of echinoid encrustation since the Late Cretaceous. Several increases have been identified since echinoid encrustation first noted occurrence from the Late Carboniferous. This trend is explained as the probable result of corresponding increases in productivity (richness, biomass, energetics, ecospace utilisation) and resources in the marine environment, including epibionts and their hosts. This conclusion matches other indicators, including the number and thickness of shell beds, bioerosion and predation intensity or biodiversity. The trajectory might have been altered to some degree by biases (e.g. selective recording, sampling effort, outcrop area, rock volume) in the same way as palaeobiodiversity estimates. Two recognised long-term gaps in echinoid encrustation (Upper Ordovician–Lower Carboniferous and Permian–Lower Cretaceous) are explained in part as bias and as biological and taphonomic signals. These gaps are caused mostly by the rapid disarticulation of Palaeozoic-type echinoids, the methodology applied here, and a lack of interest in the encrustation of Jurassic echinoids. Conversely, three short-term gaps in the Cenozoic are interpreted exclusively as bias. If correct, the present study demonstrates quantitatively the step-wise increase of productivity through time. It also suggests potential focus on further study, including the collection of new data from the field and pre-existing collections, as best for other encrustation proxies (e.g., percent of coverage by epibionts, ratio of encrusted to nonencrusted shells, taxa richness or numerical abundance of sclerobionts) in cases of large-scale analyses.
Źródło:
Annales Societatis Geologorum Poloniae; 2012, 82, 2; 139--149
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative analysis of the household’s expenditure for food
Autorzy:
Dudek, H.
Powiązania:
https://bibliotekanauki.pl/articles/572485.pdf
Data publikacji:
2011
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
quantitative analysis
household expenditure
food expenditure
food consumption
household size
Polska
European Union
Opis:
The paper deals with the dependence of the share of households’ food expenditure on the total expenditure and the household’s size. This problem is important in applied welfare economics. According to the Engel’s law, the poorer household, the greater proportion of its total expenditure is devoted to the food consumption. In the study, the Working-Leser model was applied to Polish households microeconomic data from 2000, 2005 and 2009.
Źródło:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2011, 11(26), 3
2081-6960
Pojawia się w:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methodological aspects of qualitative-quantitative analysis of decision-making processes
Autorzy:
Gawlik, R.
Powiązania:
https://bibliotekanauki.pl/articles/406734.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
qualitative-quantitative analysis
hierarchical decision-making
neural-network models
management
manufacturing processes
Opis:
The paper aims at recognizing the possibilities and perspectives of application of qualitativequantitative research methodology in the field of economics, with a special focus on production engineering management processes. The main goal of the research is to define the methods that would extend the research apparatus of economists and managers by tools that allow the inclusion of qualitative determinants into quantitative analysis. Such approach is justified by qualitative character of many determinants of economic occurrences. At the same time quantitative approach seems to be predominant in production engineering management, although methods of transposition of qualitative decision criteria can be found in literature. Nevertheless, international economics and management could profit from a mixed methodology, incorporating both types of determinants into joint decision-making models. The research methodology consists of literature review and own analysis of applicability of mixed qualitative-quantitative methods for managerial decision-making. The expected outcome of the research is to find which methods should be applied to include qualitativequantitative analysis into multicriteria decision-making models in the fields of economics, with a special regard to production engineering management.
Źródło:
Management and Production Engineering Review; 2016, 7, 2; 3-11
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental Sciences and Polish History. Quantitative Analysis of Palynological Data
Autorzy:
Izdebski, Adam
Koloch, Grzegorz
Słoczyński, Tymon
Tycner, Marta
Powiązania:
https://bibliotekanauki.pl/articles/702035.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Historyka studia metodologiczne; 2015, 45
0073-277X
Pojawia się w:
Historyka studia metodologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sustainable lean in SMEs: a quantitative analysis into improvement actions
Autorzy:
Van Landeghem, H.
Claeys, D.
Van Landeghem, T.
Powiązania:
https://bibliotekanauki.pl/articles/407201.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lean manufacturing
efficiency enhancement
productivity
continuous improvement
Opis:
Lean has established itself as the primordial approach to obtain operational excellence. Its simple and intuitive techniques focus on reducing lead time through continuous improvement, involving all levels of employees in the organization. However, the rate of successful implementations has remained low. This paper contributes to the understanding of continuous improvement in a Lean context, by analyzing a database of almost 10.000 improvement actions, from 85 companies, covering the time frame 2010–2018. It discusses categories of actions, their impact and cost, as well as key characteristics of the companies. It proposes an objective criterion to identify “success” and “failure” in Lean implementation and tries to link these to operational results. It is probably the first time an analysis of this magnitude on the subject has been performed.
Źródło:
Management and Production Engineering Review; 2018, 9, 4; 10-19
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative analysis of internet auctions advertising features: an empirical study
Autorzy:
Wojciechowski, A.
Warczynski, P.
Powiązania:
https://bibliotekanauki.pl/articles/205589.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
on-line auctions
price effectiveness
bidder behaviour
Opis:
Internet auction sites are trading platforms with huge number of visitors who may become customers. On-line auctions allow users to buy and sell products without geographical borders, as in majority of cases ordered products are delivered by surface mail. The aim of the study was to collect substantial amount of data describing on-line auctions in a variety of attributes, and customer behaviour. We provide quantitative arguments in the discussion on effectiveness of promotional features used in on-line auctions. Experimental survey showed that almost 2/3 of the total number of observed auctions were indexed in five top (out of 23) product categories. Noticeable difference in sale effectiveness was observed for particular days of week and hours of auction termination. On Saturdays and Sundays the chance to terminate an auction with transaction was 17.72% and 19.46%, respectively, while on Tuesdays – Orly 14.29%. The highest ratio of successful auction-transaction against total number of auctions ending within particular hour occurred between 19:00 and 22:00. Our approximation of job lot transactions showed that it was a common practice among bidders to buy more than one product form one seller. In the reference period about 25% of all transactions could be qualified as job-lot ones. A miniature image displayed by auction title appeared the cheapest and most price effective form of advertising an auction while promoting on action site main page was the most effective in increasing visits/displays (by 2341%), yet, the high price of this advertising feature may pay back only if customers’ visits turn into transactions.
Źródło:
Control and Cybernetics; 2012, 41, 4; 851-865
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cost-quantitative analysis of non-compliance in the internal logistics process
Autorzy:
Balon, Barbara
Roszak, Marek
Powiązania:
https://bibliotekanauki.pl/articles/1839523.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
quality
cost
internal logistics process
Pareto-Lorenz analysis
jakość
koszt
proces logistyki wewnętrznej
analiza Pareto-Lorenza
Opis:
Internal logistics is a key element of a production process as it specifies product quality, timeliness and value of orders. The purpose of the research was to determine the amount of non-compliance in the selected production process caused by internal logistics operations. The analysis covers both the quantity and type of non-compliance as well as the cost of non-compliance. One of the basic quality management tools was used in the research - Parteo-Lorenz analysis. An attempt was made to identify potential causes of non-compliance. The significant impact of non-compliance arising in internal logistics operations in production costs was pointed out.
Źródło:
Production Engineering Archives; 2020, 26, 2; 60-66
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple Quantitative Analysis of Spatio-Temporal Diagrams for Domain Wall Dynamics
Autorzy:
Kosiński, R. A.
Stępień, R.
Powiązania:
https://bibliotekanauki.pl/articles/1932111.pdf
Data publikacji:
1995-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.+b
75.10.Hk
75.60.Ch
Opis:
A quantitative analysis of spatio-temporal diagrams, which describe the dynamics of a chosen, spatially extended dynamic system (a domain wall in a thin magnetic garnet film) is presented. Two quantifiers characterizing such diagrams - a correlation function and power spectrum density function - were calculated using solutions of equations of motion. It was found that introducing these quantifiers to the analysis of spatio-temporal diagrams enables one to effectively characterize the type and the properties of motion of the considered system.
Źródło:
Acta Physica Polonica A; 1995, 87, 3; 575-583
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative Analysis of Land Use Classification in Agricultural and Forest Areas
Autorzy:
Matuk, Olga
Powiązania:
https://bibliotekanauki.pl/articles/2174642.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
land use
land cover
cadastre
land cover registration
agricultural areas
forest areas
Opis:
The article deals with the research on the quantitative classification of land use, which directly affects the amount of land use data collected in the real estate cadastre. For the purpose of this article, the cadastral systems of seven European countries – Austria, Bulgaria, Estonia, Spain, Lithuania, Germany and Poland – have been examined, taking into account how detailed is the classification in agricultural and forest areas. The research covered the provisions of legal acts applicable in the researched seven European countries and made available in national languages by the government bodies. The article asks the following three questions: 1) whether the researched countries adopted the same approach to isolating classes of items related to agricultural and forest areas; 2) whether the researched countries feature the same number of classes of items recorded at various levels of detail; 3) what is the percentage of the distinguished item classes of land uses in the agricultural and forest areas in relation to all of the distinguished item classes at all the levels of detail. The conducted research can be used as a material supporting works consisting of the modernization of the functioning of land registration in the real estate cadastre in Poland.
Źródło:
Geomatics and Environmental Engineering; 2022, 16, 4; 59--77
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative analysis of data relating to ski tourism according to Scorpus database
Autorzy:
Góra, Tomasz
Rak, Leon
Pluto-Prądzyńska, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1933138.pdf
Data publikacji:
2021-12-27
Wydawca:
PPHU Projack Jacek Wąsik
Tematy:
ski tourism
bibliometrics
research profiling
analysis of literature
physical activity
Opis:
Background: The aim of the research was to acquire knowledge as to how the development of scientific publications looks, while also to specify the scope of research on the area of ski tourism. The research process is concentrated on the following research questions: In what way has the scientific output developed in the field of research on ski tourism? Who is the principal participant (countries, universities, authors, titles of sources) in the accumulation of research in a particular field? Method: In the process of selecting the test sample as a source of bibliometric data the Scopus database was applied. The test sample (N=1500) consisted of publications that contained such phrases in their works as “ski tourism”, “ski hotels”, “ski resorts” in their titles or key words. A general profiling of publications was conducted in order to assess the trends in scientific output and the acknowledgement of the leading co-workers in the field of research. MS Excel was applied for the purpose of supporting the process of analysis and the visualization of results. Results: The analysis indicates that research on ski tourism is one of the aspects of great tradition. This has gained increasingly great interest among academic environments, which led to the breakthrough growth in the number of publications in 2006 indexed in the Scopus database. This publication output encompasses 26 research areas. Conclusions: The principal areas yielding the largest number of publications with regard to ski tourism are to be found in social sciences and science on the environment. The main authors and co-authors in this field are as follows: representatives from the EU and the USA, while the most productive research institution is Universität Innsbruck. The author of the greatest number of publications is Prof. Daniel Scott (University of Waterloo, Canada). The EU is one of the main sponsors.
Źródło:
Physical Activity Review; 2021, 2, 9; 142-148
2300-5076
Pojawia się w:
Physical Activity Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of hydrophobicity and quantitative analysis of biofilm formation by Alicyclobacillus sp.
Autorzy:
Tyfa, Agnieszka
Kunicka-Styczyńska, Alina
Zabielska, Julia
Powiązania:
https://bibliotekanauki.pl/articles/1038914.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Alicyclobacillus sp.
acidothermophilic bacteria
biofilm
hydrophobicity
glass surface
Opis:
Alicyclobacillus sp. are acidothermophilic bacteria frequently contaminating fruit based products (juices and juice concentrates). These sporulating bacteria are able to survive at elevated temperatures and highly acidic environments which causes difficulties in their removal from industrial environments. Although numerous literature data examine Alicyclobacillus sp. presence in fruit based products and methods of their elimination, there is still a limited knowledge on ability of these bacteria to adhere to abiotic surfaces. Therefore, the objective of this study was to determine Alicyclobacillus sp. cells' hydrophobicity and capability of biofilm formation on a glass surface. The degree of cells hydrophobicity, according to Microbial Adhesion to Hydrocarbon (MATH) and Salt Aggregation Test (SAT), was investigated for eleven environmental isolates from natural Polish habitats, identified as Alicyclobacillus sp., and a Alicyclobacillus acidoterrestris DSM 3922 reference strain. The dynamics of biofilm formation within 3-day incubation on a glass surface was evaluated and quantified by a plate count method both, for cultures with and without agitation. All of the bacterial strains tested expressed ability to colonize a glass surface and four environmental isolates were classified as fast-adherent strains. The mature biofilm structures were predominantly formed after 48 hours of incubation. Dynamic culturing conditions were observed to accelerate the biofilm formation. The majority of strains expressed a moderate hydrophobicity level both, in SAT (41.7%) and MATH-PBS (75.0%), as well as MATH-PUM (91.7%) tests. However, no correlation between hydrophobicity and cell adherence to a glass slide surface was observed.
Źródło:
Acta Biochimica Polonica; 2015, 62, 4; 785-790
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative analysis of reaction gases or exhaust using an online process mass spectrometer
Autorzy:
Wei, Fu-Qiang
Huang, Ze-Jian
Jian, You
Dai, Xin-Hua
Fang, Xiang
Jin, Shang-Zhong
Powiązania:
https://bibliotekanauki.pl/articles/27311738.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
online quantitative analysis
mass spectrometers
mathematical models
monitoring
Opis:
Online quantitative analysis of reaction gases or exhaust in industrial production is of great significance to improve the production capacity and process. A novel method is developed for the online quantitative analysis of reaction gases or exhaust using quantitative mathematical models combined with the linear regression algorithm of machine learning. After accurately estimating the component gases and their contents in the reaction gases or exhaust, a ratio matrix is constructed to separate the relevant overlapping peaks. The ratio and calibration standard gases are detected, filtered, normalized, and linearly regressed with an online process mass spectrometer to correct the ratio matrices and obtain the relative sensitivity matrices. A quantitative mathematical model can be established to obtain the content of each component of the reaction gases or exhaust in real time. The maximum quantification error and relative standard deviation of the method are within 0.3% and 1%, after online quantification of the representative yeast fermenter tail gas.
Źródło:
Metrology and Measurement Systems; 2023, 30, 2; 337--351
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of AIS data for qualitative and quantitative analysis of ship traffic flows
Autorzy:
Naus, Krzysztof
Wąż, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/316633.pdf
Data publikacji:
2019
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
automatic identification system
qualitative and quantitative analysis
processing AIS data
Opis:
The article presents the idea of method of processing AIS data into information useful for qualitative and quantitative analysis of ship traffic flows. In the introduction the manner of exchanging and storing data in AIS was generally characterised. An original programme for creating maps of ship traffic intensity and tabular ship profiles was described in the main part. The last part presents analysis of ship traffic flows in the Gdańsk Bay in the year 2017, conducted with the use of the original software.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2019, 20, 12; 237-240
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semi-quantitative analysis study of the impact of microwave treatment on fly ash
Autorzy:
Ma, Xian Yun
Nie, Yi Miao
Guo, Jia Le
Chen, Yang
Chang, Zhen Jia
Wang, Ling
Liu, Shu Xian
Wang, Long
Powiązania:
https://bibliotekanauki.pl/articles/27323647.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microwave
fly ash
semi-quantitative analysis
adsorption
XRD refinement
infrared fitting
NMR
Opis:
Pre-processing provides an effective way for fly ash's high value-added utilization. However, the shortcomings of pre-processing methods such as grinding and flotation are apparent with many disadvantages that make it more challenging to use efficiently. Microwave heating helps the SiO2-Al.2O3 bond break, not only can make the structural change of the material can also promote the chemical reaction process. In the article, XRD, SEM, FT-IR, ammonia nitrogen adsorption, and other methods were used to analyze the changes in the properties of fly ash before and after microwave pre-treatment, the change in adsorption performance of fly ash before and after microwave treatment was analyzed. The study found that under microwave conditions of 600 W and 15 min, the adsorption rate of ammonia nitrogen by fly ash reached a maximum of 29.67%. The intensity of mullite and amorphous diffraction peaks decreased after 20 min at 600 W. The Si-O-(Si, Al) and Si-O-(Si) bonds showed significant changes at 15 min and 20 min under 600 W conditions. Based on the results, the microwave conditions were selected at 600 W for different periods, and semi-quantitative analysis was carried out by XRD-Rietveld, infrared peak fitting, and nuclear magnetic resonance. The XRD-Rietveld analysis showed that the amorphous phase content reached 46.18% at 15 min. In the infrared peak fitting, the fitting area at 1300-900 cm-1 and 600-400 cm-1 peaks at 56.92% at 25 min and 17.5% at 15 min, respectively. The silicon-oxygen network's degree of connection and polymerization was reduced after 15 min of microwave treatment for the nuclear magnetic resonance analysis. By combining specific surface area measurements, it was discovered that the maximum specific surface area attained a value of 3.122 m2/g at 15 min.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 174897
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative analysis of stability of 9%Cr steel microstructure after long-term ageing
Autorzy:
Golański, G.
Jasak, J.
Zieliński, A.
Kolan, C.
Urzynicok, M.
Wieczorek, P.
Powiązania:
https://bibliotekanauki.pl/articles/353244.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high-chromium martensitic steels
microstructure
carbide precipitation
Opis:
The paper presents the results of research on the microstructure of martensitic X10CrMoVNb9-1 (P91) and X13CrMoCo- VNbNB9-2-1 (PB2) steel subject to long-term ageing at the temperature of 620°C and holding times up to 30 000 hours. The microstructural tests of the examined steel types were performed using a scanning microscope Joel JSM - 6610LV and a transmission electron microscope TITAN 80 - 300. The stability of the microstructure of the investigated steels was analyzed using a quantitative analysis of an image, including measurements of the following: the density of dislocations inside martensite/subgrain laths, the width of martensite laths, and the mean diameter of precipitates. It has been concluded that during long-term ageing, the microaddition of boron in PB2 steel significantly influenced the slowing of the process of degradation of the martensitic steel microstructure, as a result of slowing the process of coagulation of M23C6 carbides and Laves phase. It had a favorable effect on the stabilization of lath microstructure as a result of retardation of the processes of recovery and polygonization of the matrix.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 263-271
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative analysis of glucofrangulins and phenolic compounds in Croatian Rhamnus and Frangula species
Autorzy:
Males, Z.
Kremer, D.
Randic, Z.G.
Randic, M.
Pilepic, K.H.
Bojic, M.
Powiązania:
https://bibliotekanauki.pl/articles/19697.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2010, 52, 2
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical Activity of Senior Citizens: Quantitative Analysis of Literature Derived from Scopus Base
Autorzy:
Ortenburger, Dorota
Tsos, Anatolii
Powiązania:
https://bibliotekanauki.pl/articles/1338813.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
physical activity
bibliometric data
research profiling
senior citizens
elderly adults
Opis:
Introduction: The aim of this paper is to evaluate the development of scientific output, while also to define the scope of the subject matter of research in the sphere of the physical activity of senior citizens. The research process concentrates on the following research questions: In what way has the research output developed in the field of research on the physical activity of senior citizens? Who is the principal participant (countries, universities, authors, source titles in terms of accumulating the research subject matter in a particular field? What are the prominent subject areas that attract the greatest attention among the academic environment? Research material: Scopus data was availed in the process of selecting a research sample as the source of bibliometric data. The research data (N = 415) consisted of publications which included such phrases in their contents as: “Physically Active Elderly, Physically Active Seniors, Physically Active Older Adults” in their titles or key words. The process of analysis and visualization of the findings was supported by the use of MS Excel software. Results: The research illustrated that the physical activity of the elderly is a field of science that has a long tradition. In 2011, it gained increasingly high levels of interest among the academic environment, which in turn bore fruit in terms of the breakthrough growth in the number of publications in 2014 that are indexed in Scopus data. This scientific output encompasses 20 research areas. Conclusions: The principal areas of the greatest number of publications relate to the activity of the elderly are to be found in the areas of medical science and health science. The main authors and co-authors in this field of research are as follows: the representatives of the USA, whereas the most productive research institute is The University of British Columbia. The author of the largest number of publications is Rodríguez-Artalejo from Spain. The main sponsors of research activities in the sphere of the physical activity of the elderly are the National Institutes of Health.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2021, 33, 1; 97-103
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of Emission of Commercial Binders Used in ALPHASET Technology - Estimated Quantitative Analysis
Autorzy:
Roczniak, A.
Holtzer, M.
Kmita, A.
Powiązania:
https://bibliotekanauki.pl/articles/383333.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
environment protection
foundry engineering
ALPHASET technology
Py-GC/MS
BTEX emission
ochrona środowiska
inżynieria odlewnicza
technologia ALPHASET
emisja BTEX
Opis:
The results of investigations of three commercial binders applied in the Alphaset technology marked as: Sample E , Sample T and Sample S are presented in the hereby paper. These samples were subjected to the pyrolysis process at a temperature of 900°C (inert atmosphere, He 99.9999). The gas chromatograph coupled with the mass spectrometer and pyrolizer (Py-GC/MS) were used in the study. The identification of gases emitted during the thermal decomposition was performed on the basis of the mass spectral library. The obtained results indicate a certain diversification of emitted gases. Among the pyrolysis products the following harmful substances were identified: furfuryl alcohol, formaldehyde, phenol and also substances from the BTEX (benzene, toluene and ethylobezneze and xylenes) PAHs (Polycyclic Aromatic Hydrocarbons) and VOC groups (Volatile Organic Compounds). Therefore, from the environment protection point of view performing systematic investigations concerning the harmfulness of binders applied in the moulding and core sands technology, is essential.
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 109-114
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative analysis of ductile iron microstructure – A comparison of selected methods for assessment
Autorzy:
Mrzygłód, B.
Matusiewicz, P.
Tchórz, A.
Olejarczyk-Wożeńska, I.
Powiązania:
https://bibliotekanauki.pl/articles/379852.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ductile iron
stereology
Scheil-Schwartz-Saltykov method
microtomograph
żeliwo sferoidalne
stereologia
metoda Scheila-Schwartza-Sałtykowa
mikrotomograf
Opis:
Stereological description of dispersed microstructure is not an easy task and remains the subject of continuous research. In its practical aspect, a correct stereological description of this type of structure is essential for the analysis of processes of coagulation and spheroidisation, or for studies of relationships between structure and properties. One of the most frequently used methods for an estimation of the density Nv and size distribution of particles is the Scheil - Schwartz – Saltykov method. In this article, the authors present selected methods for quantitative assessment of ductile iron microstructure, i.e. the Scheil - Schwartz – Saltykov method, which allows a quantitative description of three-dimensional sets of solids using measurements and counts performed on two-dimensional cross-sections of these sets (microsections) and quantitative description of three-dimensional sets of solids by X-ray computed microtomography, which is an interesting alternative for structural studies compared to traditional methods of microstructure imaging since, as a result, the analysis provides a three-dimensional imaging of microstructures examined.
Źródło:
Archives of Foundry Engineering; 2013, 13, 3; 59-63
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability and economic freedom in the countries of Central and Eastern Europe: Quantitative analysis
Autorzy:
Karateev, Artem
Powiązania:
https://bibliotekanauki.pl/articles/1041595.pdf
Data publikacji:
2019-12-30
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
stability
political stability
economic freedom
data analysis
Opis:
Exploring the stability of states and political systems is of interest to scientists and politicians all around the world. One of the most important questions in this field is the question of the relationship between stability and freedom. This paper considers the relationship between economic freedom and stability with regards to the example of countries of Central and Eastern Europe. The study uses quantitative analysis and the operationalisation of economic freedom through the Index of Economic Freedom (IEF); furthermore, stability is studied through the Fragile States Index (FSI), and the Political Stability and Absence of Violence/Terrorism Index (PSI). The analysis reveals a strong correlation between economic freedom and stability. According to linear regression models obtained by the author, economic freedom has a strong impact on stability. Models show that most of the components of IEF increase stability, whilst some components decrease it. This means that the same factors affect economic freedom and stability in different ways. In particular, taxes have a very positive effect on stability. At the same it is obvious that taxes reduce economic freedom. This fact allows us to resolve the existing contradictions among politicians and scientists, who differently assess the impact of economic freedom on stability. It may be stated that whilst economic freedom has in general a strong positive effect on stability, it can also have a negative effect.
Źródło:
Eastern Review; 2019, 8; 149-159
1427-9657
2451-2567
Pojawia się w:
Eastern Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining the optimal solution treatment temperature of aluminum cast alloys by using quantitative analysis
Autorzy:
Kucharikova, L.
Tillova, E.
Powiązania:
https://bibliotekanauki.pl/articles/109049.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
aluminum cast alloys
quantitative analysis
microstructural features
eutectic Si
Fe-rich phases
Cu-rich phases
stopy aluminium
odlewnicze stopy aluminium
cechy mikrostrukturalne
analiza ilościowa
Opis:
Heat treatment of aluminum casts is necessary for achieving the desired properties of casts. Heat treatment caused changes in microstructure and substructure of materials and therefore it is necessary to control which changes are sufficient and which are insufficient. Morphology (shape, size and distribution) of microstructural features influence the properties of cast rapidly. Contribution describes influence of the heat treatment marking T4 - solution treatment in dependence on temperature (505, 515 a 525 °C) and holding time (2, 4, 8, 16 a 32 hour) on structure (α–phase, eutectic silicon, intermetallic phases) and mechanical properties (ultimate tensile strength - UTS and Brinell hardness - HBW) of A226 cast alloy. This cast alloy is made out of secondary aluminum. Secondary aluminum alloys are made of aluminum scrap. About 70 % of such material are used in the manufacture of casts. Therefore the strictly microstructure control of experimental material before and after heat treatment is necessary for declaration of cast properties. Nowadays manufacturers use the methods of quantitative analysis for quick control of microstructural features. This work present some of them.
Źródło:
Archiwum Wiedzy Inżynierskiej; 2017, 2, 2; 27-30
2544-2449
Pojawia się w:
Archiwum Wiedzy Inżynierskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New method for quantitative analysis of GD2 ganglioside in plasma of neuroblastoma patients
Autorzy:
Czaplicki, Dominik
Horwacik, Irena
Kowalczyk, Aleksandra
Wieczorek, Aleksandra
Bolek-Marzec, Katarzyna
Balwierz, Walentyna
Kozik, Andrzej
Rokita, Hanna
Powiązania:
https://bibliotekanauki.pl/articles/1040532.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
gangliosides
HPLC
human blood plasma
quantitative analysis
neuroblastoma
Opis:
Neuroblastoma, the most common extracranial solid tumour of childhood, is a malignancy of unknown origin and non-specific symptoms. One of the markers of the disease is GD2 ganglioside (disialoganglioside), which is abundantly expressed on the surface of neuroblastoma cells. Gangliosides are known to be shed by tumour cells and this phenomenon can be significant in cancer progression as they inhibit a number of immune responses both in vitro and in vivo. In search for novel markers useful in monitoring and prognosis of neuroblastoma, we developed and validated a new quantitative method of GD2 ganglioside analysis in human blood plasma. We evaluated the level of gangliosides in blood serum of 34 neuroblastoma patients using high-performance liquid chromatography. The technique was used to detect fluorescently labelled oligosaccharides derived from serum glycosphingolipids by enzymatic digestion with ceramide glycanase. The developed method allowed determination of GD2 concentrations at the picomole level and required only 40 µl of plasma, which should be particularly useful when the quantity of clinical material is limiting. Moreover, this method can be applied to study concentration of other gangliosides, as shown for GD3 ganglioside. Analysis of plasma samples from the 34 neuroblastoma patients did not reveal any correlations between the concentration of GD2 ganglioside and clinical parameters, including the results of therapy; it showed, however, that the concentration of GD2 ganglioside in the plasma of neuroblastoma patients decreased substantially in the course of treatment.
Źródło:
Acta Biochimica Polonica; 2009, 56, 3; 423-431
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 354

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies