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Tytuł:
Evaluating the performance of Extreme Learning Machine technique for ore grade estimation
Autorzy:
Abuntori, Clara Akalanya
Al-Hassan, Sulemana
Mireku-Gyimah, Daniel
Ziggah, Yao Yevenyo
Powiązania:
https://bibliotekanauki.pl/articles/1839059.pdf
Data publikacji:
2021
Wydawca:
Główny Instytut Górnictwa
Tematy:
extreme learning machine
artificial intelligence
artificial neural network
grade estimation
kriging
ELM
sztuczna inteligencja
sztuczna sieć neuronowa
Opis:
Due to the complex geology of vein deposits and their erratic grade distributions, there is the tendency of overestimating or underestimating the ore grade. These estimated grade results determine the profitability of mining the ore deposit or otherwise. In this study, five Extreme Learning Machine (ELM) variants based on hard limit, sigmoid, triangular basis, sine and radial basis activation functions were applied to predict ore grade. The motive is that the activation function has been identified to play a key role in achieving optimum ELM performance. Therefore, assessing the extent of influence the activation functions will have on the final outputs from the ELM has some scientific value worth investigating. This study therefore applied ELMas ore grade estimator which is yet to be explored in the literature. The obtained results from the five ELM variants were analysed and compared with the state-of-the-art benchmark methods of Backpropagation Neural Network (BPNN) and Ordinary Kriging (OK). The statistical test results revealed that the ELM with sigmoid activation function (ELM-Sigmoid) was the best among all the other investigated methods (ELM-Hard limit, ELM-Triangular basis, ELM-Sine, ELM-Radial Basis, BPNN and OK). This is because the ELM-sigmoid produced the lowest MAE (0.0175), MSE (0.0005) and RMSE (0.0229) with highest R2 (91.93%) and R (95.88%) respectively. It was concluded that ELM-Sigmoid can be used by field practitioners as a reliable alternative ore grade estimation technique.
Źródło:
Journal of Sustainable Mining; 2021, 20, 2; 56-71
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
HARDCORE, HARD-CORE I HARDKOR
Autorzy:
ADAM, GRUDZIEŃ
Powiązania:
https://bibliotekanauki.pl/articles/487850.pdf
Data publikacji:
2015
Wydawca:
Akademia Sztuk Pięknych im. Eugeniusza Gepperta we Wrocławiu
Tematy:
HARDCORE
HARD-CORE
HARDKOR
EKSTREMUM
PORNOGRAFIA
LITERATURA
MUZYKA
EXTREME
PORNOGRAPHY
LITERATURE
MUSIC
Opis:
Internet users mainly consider ‘hardcore’ in connection with something extreme (eg. sports), which ensures maximum intensity of dangerous experience or resistance to change. ‘Hardcore’ is also name of the style in music, which in the 1980s was initiated by the second wave of punk bands. At the same time it applies to the genre of electronic music. Inhomogeneous concept of hardcore is associated with its earlier use than those that we now know. The word ‘hardcore’ was also used as the name of a base for road construction (eg. small stones, pieces of brick and grits), and/or to describe difficult/extreme physical exercise. However, before the term ended up in the language of culture, it was an economic term, meaning people who were not only unemployed, but those unemployed who have been out of work for a year or longer. The word appears in the Oxford English Dictionary (1936) in a phrase ‘hard-core unemployment’ (hard core of unemployed) which can be traced to the difficult situation of people. In general, the first time it appears in 1930 in the texts by Irish parliamentarians. Then, after 1950, it is more often used to determine former prisoners, terrorists (pro-segregation), people addicted to hard drugs, and even ... Republicans. Associations with ‘hard’ pornography or hardcore bands of music meant that deadline was not included in the art and did not function as an aesthetic category. At the same time hardcore, in all its manifestations, the term exists because of its diverse literary layer, as ‘cute’ word, and many references that make it difficult to ignore.
Źródło:
DYSKURS: Pismo Naukowo-Artystyczne ASP we Wrocławiu; 2015, 20; 288-3015
1733-1528
Pojawia się w:
DYSKURS: Pismo Naukowo-Artystyczne ASP we Wrocławiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czy młodzież niemiecka jest zagrożona skrajnym nacjonalizmem? Między mitem a rzeczywistością
Are Young People in Germany Endangered by Extreme Nationalism? Between Myth and Reality
Autorzy:
Adamczyk, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1857993.pdf
Data publikacji:
1999
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
młodzież
nacjonalizm
Niemcy
obcokrajowcy
skrajny nacjonalizm
zjednoczenie Niemiec
youth
nationalism
Germany
foreigners
extreme nationalism
unification of Germany
Opis:
The united Germany is struggling against numerous unexpected problems, or ones whose future scale was underestimated. Apart from the economic crisis in the “new” lands, the mass unemployment, the increase in delinquency, the deepening mutual antipathy between the inhabitants of the two parts of Germany, the society was confronted with a sudden increase in popularity of extreme nationalist ideas, as well as with escalation of violence directed against foreigners. In the years 1992-1997 the number of this kind of offences ranged between 1460 and 2500 cases a year. The offences were most often committed by young people. A considerable part of young people in Germany shows support for extreme nationalist ideas. The demands that foreigners should leave Germany and vacate the jobs and flats they occupy are especially popular. A much smaller part of the young generation sees good sides of National Socialism or presents revisionist views on the question of the borders. Taking into consideration social-demographic features, an average young nationalist is a man training for a job, with rightist political views, not religious, in a fairly good financial situation, whose parents do not have a higher education. Where should one look for explanation of the increase in attractiveness of extreme nationalist ideas among young people? The thesis saying that the German nation has inborn fascist inclinations cannot be in any way defended. Explaining this phenomenon with the negative effects of unification of Germany, and especially with a crisis of identity, has a justification, but is not quite convincing with respect to the West German young people. As it seems, the solution should be looked for in the features of modern societies. Growing social-cultural pluralism and deep individualisation help a society of choice come into being. In this society a man is doomed to responsibility not only for his behaviour, but also for the choice of criteria of this behaviour; the choice must be made from many axiological systems that have equal rights. The role of “the judge of choice” that an individual has taken away from tradition, religion, science or personal authorities, however, for a post-modernist man often becomes a weight rather than a privilege and frustration and a crisis of the meaning of life is his everyday “companion”. Hence, those offers become attractive that in a simple and fairly comprehensive way describe the surrounding reality and set the criteria for everyday choices. One of these offers is extreme nationalism that not only presents a simple division of the world into two halves, but also forms a clear hierarchy of values. It gives clear and simple answers to those who have lost their bearings, makes life sensible to such an extent that it brings relief and gives meaning to their everyday existence. Young people constitute a group that most eagerly needs and looks for offers of meaning of life. This is why they are so open to the influence of extreme nationalism that, at least for a short time, is able to give as ense of restoring axiological order in a young man' life.
Źródło:
Roczniki Nauk Społecznych; 1999, 27, 1; 147-165
0137-4176
Pojawia się w:
Roczniki Nauk Społecznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatiotemporal analysis of some extreme rainfall indices over Iraq (1981–2017)
Autorzy:
Al-Lami, Alaa M.
Al-Timimi, Yaseen K.
Al-Shamarti, Hasanain K. A.
Powiązania:
https://bibliotekanauki.pl/articles/35533142.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
extreme precipitation
RClimDex
ETCCDI
climate change
OLS
Iraq
Opis:
Extreme rainfall is one of the environmental hazards with disastrous effects on the human environment. Water resources management is very vulnerable to any changes in rainfall intensities. A spatiotemporal analysis is essential for study the impact of climate change and variability on extreme rainfall. In this study, daily rainfall data for 36 meteorological stations in Iraq during 1981–2017 were used to investigate the spatiotemporal pattern of 10 extreme rainfall indices using RClimDex package. These indices were classified into two categories: rainfall total (PRCPTOT, SDII, R95p, R99p, RX1day, and RX5day) and rainfall days (CDD, CWD, R10, and R20). Depending on the mean annual precipitation data, the study area was divided into three climatic zones to examine the time series features of those 10 indices. Results showed a tendency to increase in precipitation toward the northwestern part of Iraq, and more than 70% of stations achieved a positive trend for most indices. The most frequent negative trend appeared in eight stations distributed in the western and southern parts of Iraq, namely (Heet, Haditha, Anah, Rutba, Qaim, Nukheb, Najaf, and Fao). A significant positive trend appeared obviously in PRCPTOT and R95p with a rate of 0.1–4.6 and 0.5–2.7 mm per year, respectively. Additionally, the least trend increasing appeared in all precipitation days indices specifically in R10 and R20. Time series analyses revealed a positive trend in all regions under study, except SDII in the southern region. The most significant rate of change was noticed in regions one and two (northern and middle parts of Iraq), particularly for PRCPTOT and R95p 3.26 and 2.45 mm per day, respectively. Only the northern and eastern regions of Iraq experienced a high probability of significant extreme rainfall.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 2; 221-235
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of the structures at shakedon and Rosens optimality criterion
Optymalizacja konstrukcji w stanie przystosowania a kryterium optymalności Rosena
Autorzy:
Alawdin, P.
Atkociunas, J.
Liepa, L.
Powiązania:
https://bibliotekanauki.pl/articles/396093.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
shakedown
extreme energy principles
optimal design
mathematical programming
Rosen’s optimality criterion
przystosowanie
ekstremalne zasady energetyczne
projektowanie optymalne
programowanie matematyczne
kryterium optymalności Rosena
Opis:
Paper focuses on the problems of application of extreme energy principles and nonlinear mathematical programing in the theory of structural shakedown. By means of energy principles, which describe the true stress-strain state conditions of the structure, the dual mathematical models of analysis problems are formed (static and kinematic formulations). It is shown how common mathematical model of the structures optimization at shakedown with safety serviceability constraints (according to the ultimate limit state (ULS) and serviceability limit state (SLS) requirements) on the basis of previously mentioned mathematical models is formed. The possibilities of optimization problem solution in the context of physical interpretation of optimality criterion of Rosen‘s algorithm are analyzed.
W pracy przedstawiono problemy zastosowania ekstremalnych zasad energetycznych i nieliniowego programowania matematycznego w teorii przystosowania konstrukcji. Za pomocą zasad energetycznych, które opisują rzeczywiste stany naprężenia-odkształcenia konstrukcji, tworzone są dualne modele matematyczne analizowanych problemów (sformułowania statyczne i kinematyczne). Pokazano jak na podstawie wyżej wymienionych modeli matematycznych formułowany jest ogólny model matematyczny optymalizacji konstrukcji przy uwzględnieniu ograniczeń w postaci stanów granicznych nośności/bezpieczeństwa i użytkowalności. Analizowane są możliwości rozwiązania problemu optymalizacji w kontekście fizycznej interpretacji kryterium optymalności algorytmu Rosena.
Źródło:
Civil and Environmental Engineering Reports; 2016, No. 22(3); 5-23
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metoda podziału zbioru obiektów na wielokryterialne klastry jakościowe
The method of distribution of a set of objects into multi-criteria quality clusters
Autorzy:
Ameljańczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/305965.pdf
Data publikacji:
2013
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
ranking
elementy ekstremalne
klastry rankingowe
kategorie
punkt idealny
funkcja rankingowa
ranking liniowy
relacje preferencji
extreme elements
categories
ideal point
functions
linear ranking
preference relations
clusters
Opis:
W pracy przedstawiono ogólną procedurę tworzenia rankingów jakościowych elementów ustalonego zbioru obiektów. Procedura polega na rekurencyjnym wyznaczaniu elementów ekstremalnych zbioru na podstawie przyjętej relacji preferencji. Efektem jej działania jest podział zbioru na klastry rankingowe (kategorie). Przedstawione metody podziału zbioru na klastry mogą być wykorzystywane w analizie jakościowej obiektów w wielu praktycznych zastosowaniach.
The paper presents a general procedure for creating quality rankings of objects. Ranking procedure fixed set of elements by recurrent determining the extreme elements of the set on the basis of its preference relation. The result of the procedure is to divide the set into ranking clusters (categories). The method splits the set of the clusters can be used in qualitative analysis of objects in many practical applications.
Źródło:
Biuletyn Instytutu Systemów Informatycznych; 2013, 12; 1-7
1508-4183
Pojawia się w:
Biuletyn Instytutu Systemów Informatycznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rankingi w warunkach niepewności
Rankings in conditions of uncertainty
Autorzy:
Ameljańczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/208395.pdf
Data publikacji:
2014
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
relacja preferencji
elementy ekstremalne
klastry rankingowe
model niepewności Hurwicza
ranking w warunkach niepewności
preference relation
extreme elements
ranking clusters
Hurwicz model of uncertainty
ranking under uncertainty
Opis:
Praca dotyczy procedur rankingowych zbioru obiektów, których jakość (użyteczność) zmienia się w zależności od występowania warunków, których rozkład prawdopodobieństwa na ogół nie jest znany. Procedura polega na rekurencyjnym wyznaczaniu elementów ekstremalnych zbioru na podstawie przyjętej relacji preferencji jakościowych w warunkach niepewności. Efektem jej działania jest podział zbioru na jakościowe klastry rankingowe, a w konsekwencji ranking elementów analizowanego zbioru w warunkach niepewności. W pracy rozważono model preferencji Hurwicza i jego przypadki szczególne, omówiono własności uzyskiwanych rankingów oraz metody ich wyznaczania.
The work concerns the procedures for ranking a set of objects whose value (utility) varies depending on the occurrence of the conditions for the probability distribution is not generally known. The procedure involves determining the recursive extreme elements of a set on the basis of its qualitative preference relations under uncertainty. The result of the operation is to divide a set of the qualitative ranking clusters and consequently the ranking of elements analyzed under conditions of uncertainty. The study considered Hurwicz model preferences and special cases are discussed ownership rankings obtained and the methods of their determination.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2014, 63, 4; 29-42
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An assessment of machine learning and data balancing techniques for evaluating downgrade truck crash severity prediction in Wyoming
Autorzy:
Ampadu, Vincent-Michael Kwesi
Haq, Muhammad Tahmidul
Ksaibati, Khaled
Powiązania:
https://bibliotekanauki.pl/articles/2176018.pdf
Data publikacji:
2022
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
crash severity
performance
extreme gradient boosting tree
adaptive boosting tree
random forest
gradient boost decision tree
adaptive synthetic algorithm
Opis:
This study involved the investigation of various machine learning methods, including four classification tree-based ML models, namely the Adaptive Boosting tree, Random Forest, Gradient Boost Decision Tree, Extreme Gradient Boosting tree, and three non-tree-based ML models, namely Support Vector Machines, Multi-layer Perceptron and k-Nearest Neighbors for predicting the level of severity of large truck crashes on Wyoming road networks. The accuracy of these seven methods was then compared. The Final ROC AUC score for the optimized random forest model is 95.296 %. The next highest performing model was the k-NN with 92.780 %, M.L.P. with 87.817 %, XGBoost with 86.542 %, Gradboost with 74.824 %, SVM with 72.648 % and AdaBoost with 67.232 %. Based on the analysis, the top 10 predictors of severity were obtained from the feature importance plot. These may be classified into whether safety equipment was used, whether airbags were deployed, the gender of the driver and whether alcohol was involved.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2022, 7, 2; 6--24
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Developing a Decision Support System for Supply Chain Component
Autorzy:
Andry, Johanes Fernandes
Nurprihatin, Filscha
Liliana, Lydia
Powiązania:
https://bibliotekanauki.pl/articles/24200510.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
decision support system
extreme programming
furniture manufacture industry
supply chain
Opis:
Increased competition has led businesses to compete with each other in streamlining supply chain processes, especially in the manufacturing sector. Supply Chain Management (SCM) determines the success of industrial business processes because it regulates product flow regarding integration, performance, and information. However, several problems have emerged in the supply chain process, such as a lack of coordination in the production queue, difficulties in forecasting trending products, and suboptimal production capacity. To address these issues, the role of information technology is crucial for implementing a Decision Support System (DSS). This study aims to develop a DSS to improve the supply chain processes. The research method used is Extreme Programming (XP) with a qualitative approach through a questionnaire. The research process involves collecting data, defining boundaries and problems, and designing, coding, and testing the system. As a final step, evaluation is carried out by distributing surveys to obtain valid satisfaction results. This research produces a DSS that has applicability in marketing, accounting, and production processes. The application of DSS in the furniture manufacturing industry can help manage the movement of resources, optimize strategic networks, and assist decision-making in the supply chain process.
Źródło:
Management and Production Engineering Review; 2023, 14, 2; 124--133
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Information Geometry of Frechet Distributions
Autorzy:
Arwini, Khadiga Ali
Powiązania:
https://bibliotekanauki.pl/articles/1030590.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Frechet distribution
extreme value distributions
information geometry
statistical manifold
Opis:
Using the Fisher information matrix (FIM) as a Riemannian metric, the family of Frechet distributions determines a two dimensional Riemannian manifold. In this paper we illustrates the information geometry of the Frechet space, and derive the α-geometry as; α-connections, α-curvature tensor, α-Ricci curvature with its eigenvalues and eigenvectors, α-sectional curvature, α-mean curvature, and α-scalar curvature, where we show that Frechet space has a constant α-scalar curvature. The special case where α = 0 corresponds to the geometry induced by the Levi-Civita connection. In addition, we consider three special cases of Frechet distributions as submanifolds with dimension one, and discuss their geometrical structures, then we prove that one of these submanifolds is an isometric isomorph of the exponential manifold, which is important in stochastic process since exponential distributions represent intervals between events for Poisson processes. After that, we introduce log-Frechet distributions, and show that this family of distributions determines a Riemannian 2-manifold which is isometric with the origin manifold. Finally, an explicit expressions for some distances in Frechet space are obtained as, Kullback-Leibler distance, and J-divergence.
Źródło:
World Scientific News; 2020, 144; 296-312
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three boundary value problems for second order differential inclusions in Banach spaces
Autorzy:
Azzam, D.
Castaing, C.
Thibault, L.
Powiązania:
https://bibliotekanauki.pl/articles/205529.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
całka Pettisa
druga pochodna
miara Younga
punkt ekstremum
relaksacja
warunek brzegowy
wielofunkcja
boundary
extreme point
multifunction
Pettis integral
relaxation
second derivative
Young measure
Opis:
The paper studies, in the context of Banach spaces, the problem of three boundary conditions for both second order differential inclusions and second order ordinary differential equations. The results are obtained in several new settings of Sobolev-type spaces involving Bochner and Pettis integrals. Some classes of second order multivalued evolution equations associated with m-accretive operators are also considered. Applications to some control problems are provided with the help of narrow convergence for Young measures.
Źródło:
Control and Cybernetics; 2002, 31, 3; 659-693
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatio-Temporal Model of Extreme Rainfall Data in the Province of South Sulawesi for a Flood Early Warning System
Autorzy:
Bakri, Bambang
Adam, Khaeryna
Rahim, Amran
Powiązania:
https://bibliotekanauki.pl/articles/1838013.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
spatio-temporal model
extreme rainfall
province of South Sulawesi
El Nino South Oscillation
Indian Ocean Dipole Mode
Madden-Julian Oscillation
Opis:
In this study, we model extreme rainfall to study the high rainfall events in the province of South Sulawesi, Indonesia. We investigated the effect of the El Nino South Oscillation (ENSO), Indian Ocean Dipole Mode (IOD), and Madden-Julian Oscillation (MJO) on extreme rainfall events. We also assume that events in a location are affected by events in other nearby locations. Using rainfall data from the province of South Sulawesi, the results showed that extreme rainfall events are related to IOD and MJO.
Źródło:
Geomatics and Environmental Engineering; 2021, 15, 2; 5-15
1898-1135
Pojawia się w:
Geomatics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic structure of Picea abies populations growing on extreme sites as revealed by isoenzyme markers: a case study from Slovenia and Bosnia and Herzegovina
Autorzy:
Ballian, D
Bogunic, F.
Bozic, G.
Powiązania:
https://bibliotekanauki.pl/articles/41007.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
international conference
Europe
forest ecosystem
plant breeding
tree
Norway spruce
Picea abies
plant population
genetic structure
extreme site
isoenzyme marker
genetic variation
gene polymorphism
forest tree
Slovenia
Bosnia and Herzegovina
forest community
Sphagno-Piceetum community
Opis:
Three populations of Norway spruce from ecologically extreme environments in Slovenia and Bosnia and Herzegovina were examined for genetic polymorphism. The spruces there grow in specific forest communities (Sphagno-Piceetum) which represent the remnants of the post-glacial vegetation. The aim of the study was to search for similarities in the genetic variation among populations adapted to such conditions. In total, 10 isoenzyme systems involving 16 gene loci were analysed. The results showed differences in genetic differentiation at loci Got-B, Skdh-A and 6-Pgdh-C between the two Slovenian populations and the Bosnian population, but also indicated an interestingly close relationship between the Slovenian population Pohorje and the Bosnian population Nišići.
Źródło:
Dendrobiology; 2009, 61 Supplement
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extreme temperature days in Kolobrzeg in the years 1976-2005 and their relation to atmospheric circulation types
Dni charakterystyczne pod względem termicznym w Kołobrzegu w latach 1976-2005 i ich związek z typami cyrkulacji atmosferycznej
Autorzy:
Baranowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/85161.pdf
Data publikacji:
2011
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
extreme temperature
day
Kolobrzeg town
atmospheric circulation
circulation type
thermal condition
air temperature
monthly temperature
Opis:
In this work a general characteristics of thermal conditions in Kołobrzeg in the years 1976-2005 is presented. The most important part of the paper is the analysis of extreme temperature days (very frosty, frosty, warm and hot) in relation to the types of atmospheric circulation (according to the classification proposed by Osuchowska-Klein 1978). Daily mean and extreme air temperature data for the weather station in Kołobrzeg were the basis of the paper. The obtained results provide strong evidence that the occurrence of days with extreme air temperatures depends mostly on the atmospheric circulation pattern. Particularly high and low air temperatures in Kołobrzeg, in most cases, are not determined by the character (cyclonic or anticyclonic) of atmospheric circulation, but mainly by the direction of air advection. More detailed analysis has revealed that in the winter months (Dec-Feb) the highest frequency of days with sub-zero maximum temperatures is usually associated with the incursion of continental polar air during anticyclonic circulation types. Conversely, maritime air flow from the Atlantic Ocean most often induced by zonal circulation (especially during cyclonic types over Poland) regularly brings warming in winter. In the warm halfyear (Apr-Sep) strong and persistent advection of the air from the southern or eastern sector (in anticyclonic types: E1, E, D2C and cyclonic ones: F and B) is the most important factor determining the occurrence of warm and hot days in Kołobrzeg. The days with tmax ≥ 25oC appear most rarely during the types accompanied by the winds from the western or northern sector.
Pierwszą część pracy stanowi ogólna charakterystyka warunków termicznych w Kołobrzegu w 30-leciu 1976-2005. Głównym celem opracowania jest jednak określenie częstotliwości występowania w Kołobrzegu charakterystycznych pod względem termicznym dni (bardzo mroźnych, mroźnych, ciepłych i gorących) oraz wyróżnienie typów cyrkulacji atmosferycznej (według klasyfikacji B. Osuchowskiej-Klein 1978) sprzyjających ich występowaniu. Ze względu na brak katalogu typów cyrkulacji z ostatnich 10 lat badanego okresu, analizę dni charakterystycznych pod względem termicznym w poszczególnych typach cyrkulacji atmosferycznej ograniczono do 20-lecia 1976-1995. W wyniku przeprowadzonych analiz ustalono, że występowanie najniższych temperatur zimą najczęściej związane jest z napływem powietrza z sektora północno-wschodniego zarówno w cyklonalnych (E0), jak i antycyklonalnych (E, E1) typach cyrkulacji, natomiast napływ wilgotnych mas powietrza z zachodu (cyrkulacja strefowa) w cyklonalnych typach przynosi zimą zdecydowane ocieplenie. W ciepłym półroczu (IV-IX) adwekcja powietrza z sektora południowego lub wschodniego (w cyklonalnych typach cyrkulacji: F i B oraz antycyklonalnych: E1, E, D2C) sprzyja większej częstotliwości występowania dni ciepłych i gorących. Najrzadziej dni z tmax ≥ 25°C towarzyszą typom cyrkulacji sprowadzającym do Polski masy powietrza z sektora północnego i południowo-zachodniego. W półroczu chłodnym występuje większe zróżnicowanie termiczne między poszczególnymi typami cyrkulacji atmosferycznej.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2011, 15
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 266

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