Wszystkie pola: statistical evaluation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Statistical evaluation of propriety of measurements of ship’s movement parameters
Autorzy:: Charchalis, A.
Polanowski, S.
Powiązania:: https://bibliotekanauki.pl/articles/244984.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: diagnostics
vessel’s propulsion systems
ship propulsion characteristics for ships with fixed propeller modelling
determination of power characteristics
Opis:: The paper presents some problems of carrying out measurements of energetic characteristics and vessel’s performance in the conditions of sea examinations. As the object of propulsion characteristic determination was selected the ship with fixed pitch propeller. In order to formulate models of power characteristics, in first, known physical aspect were taken and subsequently statistic theory was implemented. Models of propulsion performance were built basing on two theoretical methods of determination of required shaft power and torque at a hub, as the function of propeller’s revolutionary speed and sailing condition represented by dimensionless coefficients. Model number one, based on Silukov method presents function with variable power index, of shaft power in domain of revolutionary speed. The second one presents model of torque variations, based on Silovic – Fancev method. For verification of models were taken presented in available bibliography, results of researches of ship’s propulsion systems [6]. We also discuss the manner of reducing the results of measurements to the standard conditions. We present the way of preparing propulsion characteristics and the analysis of examination uncertainty for the measurement of torque. Statistical analysis of deviation of results, using three models, proposed in the paper. As a result of analysis, one point from primary data set was rejected due to its unreliability, what was resulting with higher adequacy of characteristics.
Źródło:: Journal of KONES; 2016, 23, 1; 83-89
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Statistical evaluation of impact factors to the energy consumption of machine tools
Autorzy:: Wittstock, V.
Kolouch, M.
Paetzold, J.
Powiązania:: https://bibliotekanauki.pl/articles/100171.pdf
Data publikacji:: 2013
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: energy efficiency
machine tool
statistical analyses
Opis:: In this paper, a method for the evaluation of the energy consumption of machine tools is presented. For this purpose, the energy consumption of various machine tools has been investigated experimentally. In order to increase the evaluation basis, measured values of energy consumption were also taken from literature. The evaluation contains an analysis of various factors concerning the productivity and the size of the investigated machine tools. This analysis is capable of detecting the impact factors to increase the energy-efficiency of production systems. It can further reduce the effort required for data acquisition when various machine tools are compared.
Źródło:: Journal of Machine Engineering; 2013, 13, 2; 79-91
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Ryzyko w projektach informatycznych – statystyczne narzędzia oceny
THE RISK IN IT PROJECTS – STATISTICAL EVALUATION TOOLS
Autorzy:: Winiarski, Jacek
Powiązania:: https://bibliotekanauki.pl/articles/418990.pdf
Data publikacji:: 2012
Wydawca:: Uniwersytet Gdański. Wydział Ekonomiczny
Tematy:: risk IT projects
statistical risk measures
Opis:: The purpose of this article is to present the possibility of using statistical tools to assess the magnitude of the threat of projects. The text presents the author's interpretation of the phenomenon of the risk inherent in the process of implementing IT projects and assesses the usefulness of selected statistical tools that can be used in the analysis of the risks that could cause derogation to the planned size of the resources of the project.
Źródło:: Współczesna Gospodarka; 2012, 3, 4; 35-42
2082-677X
Pojawia się w:: Współczesna Gospodarka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Ocena statystyczna rynku usług gastronomicznych w Polsce
Statistical evaluation of catering services market in Poland
Autorzy:: Urban, Stanisław
Kowalska, Anna
Powiązania:: https://bibliotekanauki.pl/articles/452877.pdf
Data publikacji:: 2012
Wydawca:: Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:: analiza skupień
gastronomia
taksonomia
cluster analysis
gastronomy
taxonomy
Opis:: Celem artykułu jest ocena rozwoju usług gastronomicznych w Polsce. Zaprezentowano w nim zróżnicowanie poziomu rozwoju w poszczególnych regionach i województwach. Wykorzystano do tego analizę skupień, taksonomię, liniową funkcję trendu i dynamikę zmian.
The aim of this paper is to assess the development of catering services in Poland. There was presented the different levels of development in different regions and provinces using a cluster analysis, a taxonomy, a linear trend function and dynamics of change.
Źródło:: Metody Ilościowe w Badaniach Ekonomicznych; 2012, 13, 3; 232-242
2082-792X
Pojawia się w:: Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Statystyczna ocena danych w badaniach nieniszczących materiałów kompozytowych metodami termografii w podczerwieni
Statistical evaluation of data in nondestructive testing of composite materials by IR thermography methods
Autorzy:: Świderski, W.
Vavilov, V.
Powiązania:: https://bibliotekanauki.pl/articles/235868.pdf
Data publikacji:: 2009
Wydawca:: Wojskowy Instytut Techniczny Uzbrojenia
Tematy:: termografia w podczerwieni
ocena statystyczna
infrared thermography
statistical evaluation
Opis:: W artykule przedstawiono statystyczne kryteria zwiększające efektywność wykrywania defektów w badaniach nieniszczących materiałów kompozytowych z zastosowaniem metod termografii w podczerwieni, tworzenia map defektów i rozpoznawania obrazów. Przeanalizowano również wpływ szumów i zakłóceń na wyniki tych badań. Przedstawiono szereg przykładowych wyników badań eksperymentalnych ilustrujących analizowane zagadnienia.
Statistical criteria improving effectiveness of detection of defects in nondestructive testing of composite materials by IR thermography methods and creating defect maps and recognition of pictures are presented in the paper. The influence of noises and disturbances on results of these testing was analyzed. Some exemplary results of experimental tests are also presented to illustrate presented problems.
Źródło:: Problemy Techniki Uzbrojenia; 2009, R. 38, z. 112; 59-73
1230-3801
Pojawia się w:: Problemy Techniki Uzbrojenia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Bioecological and statistical risk assessment of toxic metals in sediments of a worldwide important wetland : Gala Lake National Park (Turkey)
Autorzy:: Tokatli, C.
Powiązania:: https://bibliotekanauki.pl/articles/205162.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Gala Lake
sediment quality
statistical evaluation
bioecological indices
GIS
Opis:: Gala Lake National Park that has an international importance is one of the most important wetland ecosystems for Turkey. As same as many aquatic habitats, Gala Lake is under a significant anthropogenic pressure originated from agricultural activities conducted around the lake and from industrial discharges by means of Ergene River. The aim of this study was to evaluate the sediment quality of Gala Lake and Irrigation Canal by investigating some toxic element accumulations (As, B, Ni, Cr, Pb, Cd, Zn and Cu) from a statistical perspective. Pearson Correlation Index (PCI) and Factor Analysis (FA) were applied to detected data in order to determine the associated contaminants and effective factors on the system. Potential Ecological Risk Index (RI) and Biological Risk Index based sediment quality guidelines (mERM-Q) applied to detected data in order to assess the ecological and biological risks of heavy metals in the ecosystem. Also Geographic Information System (GIS) technology was used to make visual explanations by presenting distribution maps of investigated elements. According to the results of PCI, significant positive correlations were recorded among the investigated toxic elements at 0.01 significance level. According to the results of FA, two factors, which were named as “Agricultural Factor” and “Industrial Factor”, explained 86.6% of the total variance. According to the results of Potential Ecological Risk Index, cadmium was found to be the highest risk factor and according to results of Biological Risk Index, nickel and chromium were found to be the highest risk factors for Gala Lake and Irrigation Canal. As a result of the present study, it was also determined that heavy metal contents in sediments of Gala Lake National Park reached to critical levels and the system is intensively under effect of agricultural and industrial originated pollution.
Źródło:: Archives of Environmental Protection; 2017, 43, 1; 34-47
2083-4772
2083-4810
Pojawia się w:: Archives of Environmental Protection
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Statistical evaluation of the geochemical data for prospecting polymetallic mineralization in the Suoi Thau–Sang Than region, Northeast Vietnam
Autorzy:: Hung, Khuong The
Sang, Pham Nhu
Phuong, Nguyen
Linh, Vu Thai
Sang, Bui Viet
Powiązania:: https://bibliotekanauki.pl/articles/1841771.pdf
Data publikacji:: 2020
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: polymetallic mineralization
statistical evaluation
Suoi Thau-Sang Than region
Vietnam
Opis:: In Northeast Vietnam, Suoi Thau-Sang Than is considered as a high potential area of polymetallic deposits. 1,720 geochemical samples were used to investigate polymetallic mineralization; thereby polymetallic ore occurrences in this study region were discovered and the statistical and multivariate analysis helps to define geochemical anomalies in some northeastern regions, namely Suoi Thau, Sang Than, and Ban Kep. The statistical method and cluster analysis of geochemical data indicate that the Cu, Pb, and Zn elements are good indicators, and most of them comply with the lognormal or gamma distribution. Based on the third-order threshold, the geochemical anomalies of the content of the Cu, Pb, and Zn elements reflect the concentration of copper forming ore bodies in the mineralized zone, and clearly show the concentration in three distinct zones. The trend surface analysis which was employed to determine spatial variations and relationships among these good indicator elements and anomalous areas revealed relative changes in the content of the indicator elements, and they can be considered as regular. Moreover, the goodness of fit obtained trend functions of Pb and Zn, and Cu elements is a third-degree trend surface model. These results indicate that the models can be useful in studying geochemical anomalies and analyzing the tendency of the concentration of indicator elements in the Suoi Thau-Sang Than region. Additionally, it is suggested that the statistical analysis shows a remarkable potential to use the bottom river sediments in the region to investigate polymetallic mineralization. Moreover, geochemical data can help to evaluate geochemical anomalies of the pathfinder elements and potential mineral mapping of the Suoi Thau-Sang Than region in Northeast Vietnam.
Źródło:: Geology, Geophysics and Environment; 2020, 46, 4; 285-299
2299-8004
2353-0790
Pojawia się w:: Geology, Geophysics and Environment
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Statistical Evaluation of Variation of the River Bug Water Chemical Contamination
Statystyczna ocena zmienności zanieczyszczenia chemicznego wód rzeki Bug
Autorzy:: Rymuza, Katarzyna
Radzka, Elżbieta
Powiązania:: https://bibliotekanauki.pl/articles/1811782.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: Bug river
chemical contaminants
principal component analysis
cluster analysis
analysis of variance
rzeka Bug
zanieczyszczenia chemiczne
analiza składowych głównych
analiza skupień
analiza wariancji
Opis:: The work presents analysis of chemical condition of the water of the River Bug stretch extending from Kiryłowo to Krzyszew. The analysis was preformed based on data of monitoring of surface water quality available on the website of Voivodeship Inspectorate of Environmental Protection in Lublin (WIOŚ) spanning the years 2015-2017. Eight measurement points and the following months were considered: February, April, June, August, October and December. Analysis of variance and Kruskal-Wallis test were used to analyse the effect of localities and months on selected chemical indicators. The concentrations of nearly all the parameters (excluding BOD) were found to be influenced by the localities. Phosphorus content, sulphates and chlorides increased along the course of the river. Also, the analysis revealed that the concentration of ammonium ions, dissolved oxygen, sulphates and chlorides increased in winter. Multidimensional analysis demonstrated that differences in chemical conditions between the localities were predominantly due to nitrogen compound content, total phosphorus content and chlorides. Cluster analysis showed that in nearly all the months (excluding August) the tested stretch of the River Bug could be divided into two parts with different chemical composition parameters. The first part, characterised by higher average values of ammonium nitrogen content, dissolved oxygen content and total phosphorus content, included the following measurement points: Krzyszew, Kukuryki, Włodawa and Kuzawka. The second part was formed by the following localities: Kryłów, Zosin and Horodło, all with higher average BOD values, sulphates and chlorides.
W pracy przedstawiano analizę chemicznego stanu wód rzeki Bug na odcinku od Kryłowa do Krzyszewa. Analizy tej dokonano na podstawie danych pochodzących z monitoringu jakości wód powierzchniowych zamieszczonych na stronie Wojewódzkiego Inspektoratu Ochrony Środowiska w Lublinie (WIOŚ) z lat 2015-2017. Pod uwagę wzięto dane z lutego, kwietnia, czerwca, sierpnia, października i grudnia z 8 punktów pomiarowych. Przy pomocy analizy wariancji oraz testu Kruskala-Wallisa przeanalizowano wpływ miejscowości oraz miesięcy na zawartość wybranych wskaźników chemicznych. Stwierdzono, że zawartość prawie wszystkich parametrów (poza BZT5) różnicowana była przez miejscowości. Wraz z biegiem rzeki zmniejszała się zawartość fosforu, siarczanów i chlorków. Analiza wykazała ponadto, że zimą rosło stężenie jonów amonowych, zawartość tlenu rozpuszczonego, siarczanów i chlorków. Wielowymiarowa analiza natomiast dowiodła, że różnice stanu chemicznego pomiędzy miejscowościami związane były głównie z zawartością związków azotu, fosforu ogólnego oraz chlorków. Na podstawie analizy skupień prawie we wszystkich miesiącach (poza sierpniem) odcinek rzeki Bug pod względem stanu chemicznego można podzielić na dwie części. Pierwszą grupę stanowi odcinek rzeki z punktami pomiarowymi w Krzyszewie, Kukurykach, Włodawie i Kuzawce o większych średnich zawartościach azotu amonowego, tlenu rozpuszczalnego i fosforu ogólnego. Drugą grupę utworzyły miejscowości: Kryłów, Zosin i Horodło o wyższych średnich stężeniach BTZ5, siarczanów i chlorków.
Źródło:: Rocznik Ochrona Środowiska; 2019, Tom 21, cz. 1; 672-690
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: A statistical study of climate change in Ukraine under martial law
Autorzy:: Kobylynska, Тetiana
Legan, Iryna
Motuzka, Olena
Powiązania:: https://bibliotekanauki.pl/articles/10096948.pdf
Data publikacji:: 2023-02-24
Wydawca:: Główny Urząd Statystyczny
Tematy:: climate change statistics
environmental and economic accounting
natural environment
statistical evaluation
ecological processes
Opis:: The article concentrates on the development of theoretical and methodological foundations of statistical research in the field of national environmental and economic accounting, which forms the basis for the development of indicators of climate change under martial law and shapes the adaptation to these changes. Given Russia's military aggression against Ukraine, the national statistical system is faced with an urgent task of ensuring the continuity of the production of complete and high quality statistical information. The issue of forming a methodology for the production of statistical information in the field of ecology, i.e. climate change statistics, remains unresolved. Outlining ways to address this issue is an important condition for the improvement of modern state statistics of Ukraine and the development of statistical theory and practice, as this largely determines the quality of the information-related support for environmental management at all levels. The statistical estimation of the dynamics and structure of greenhouse gas emissions on the basis of the economic activity of enterprises was performed. It was pointed out that among the various related branch methods of obtaining information, the system of environmental and economic accounting is the most relevant and source of high quality data. One of the aspects of solving the complex problem of forming methodological bases for collecting statistical environmental information is the creation of a national system of indicators of climate change and preparing statistical informational products using administrative data sources. The paper studies issues of producing ecological information relating to Ukraine according to statistical data. Moreover, the main problems which arise during the construction of national environmental accounts were characterised. Finally, the paper identified the key factors which influence to the largest extent the quality of statistical data and calculations, and which are necessary for the transformation and development of the statistical estimation of climate change under Russian military aggression.
Źródło:: Statistics in Transition new series; 2023, 24, 1; 63-87
1234-7655
Pojawia się w:: Statistics in Transition new series
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Statistical evaluation of the effect of secondary municipal wastewater and solid waste leachate on ground water quality at Lawspet in Puducherry, India
Autorzy:: Nathan, N. S.
Saravanane, R.
Sundararajan, T.
Powiązania:: https://bibliotekanauki.pl/articles/207184.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: cluster analysis
discriminant analysis
municipal waste water
multivariate analysis
municipal solid waste
wastewater disposal
water quality
analiza skupień
analiza dyskryminacyjna
analiza wieloczynnikowa
komunalne odpady stałe
utylizacja ścieków
jakość wody
Opis:: At Lawspet area in Puducherry, India, a unique situation of co-disposal of solid waste dumping and secondary wastewater disposal on land, prevails simultaneously within the same campus. So an attempt is made to assess the combined effect of this co-disposal on the environmental quality and pollution effects on groundwater quality with a view to correctly monitor the situation. Multivariate statistical analysis like hierarchical cluster analysis (HCA) and discriminant analysis (DA) were employed. HCA was performed on borewells, physiochemical parameters and seasons. Borewell clustering identified four clusters illustrating varying degree of groundwater contamination. In parameter clustering, two major clusters were formed indicating hardness and anthropogenic components. Temporal clustering identified three major clusters indicating pre-monsoon, monsoon and post-monsoon. Discriminant analysis revealed nine significant parameters which discriminate four clusters qualitatively affording 86% correct assignation to discriminate among the clusters. Also three major components viz. anthropogenic, hardness and geogenic responsible for groundwater quality in the study area were identified. Conclusively the investigation revealed that the direction of the contaminant transport is towards the southeast direction of the study area, where all the borewells (100%) are affected.
Źródło:: Environment Protection Engineering; 2018, 44, 1; 85-102
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki

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