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Tytuł:
Zachowania dewiacyjne młodzieży w Warszawie w 1993 r. (badania typu self-report)
Deviant Behavior n Warsaw Youth in 1993
Autorzy:
Kossowska, Anna
Krawczyk, Jacek
Rzeplińska, Irena
Powiązania:
https://bibliotekanauki.pl/articles/699078.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Nauk Prawnych PAN
Tematy:
zachowania dewiacyjne
młodzież
Warszawa
nieprzystosowanie społeczne
przestępczość
badania typu self-report
deviant behavior
youth
Warsaw
social maladjustment
delinquency
self-report study
Opis:
1. The findings discussed in the paper have been obtained within an international research project aimed at comparing the extent of self-reported deviant behavior of youth 11 West-European countries (Finland, England, Nord Ireland the Netherland, Germany, Belgium, Switzerland, portugal, Greece, Spain and Italy), the United States and New Zealand. The questionnaire ultimately used in all countries participating in the project resulted from long negotiations and was in fact a compromise. It contained questions about both the respondents’ deviant behavior and their social situation with consideration to variables of importance from the viewpoint of the theory of social control. Deviant behavior was divided into the following six groups: l) behavior manifesting social maladjustment (as.e.g. truancy or stealing rides); 2) destruction of objects (vandalism); 3) appropriation of another person’s property; 4) aggressive behavior; 5) alcohol consumption; and 6) drug taking and selling.  Examined were young people from Warsaw, born in the years 197l‒1978; the sample consisted of 701 persons aged 14‒21 at the time of the survey. At the moment of the interview, 80.5 % of respondents either had a job or went to school.  Most respondents (65.9%) stated they were on good terms with their father. Even a greater proportion of 88.5% were on good terms with their mother. Ten percent of the sample had no contacts whatever with their father, and a much smaller proportion (2.3%) ‒ with their mother.  Apart from 42 persons, respondents stated they had real friends; over a half had one to three such friends. The rest mentioned larger groups as their friends. Forty-seven percent had a girl- or boyfriend; two-thirds would like the relationship to last. Of the examined 363 boys, 84.8% had played truant from school at least once for one day. The proportion tended to grow bigger with respondents’ age. It showed a regular upward trend from 50% among the14-year-olds to 100% among boys of 23. Of the examined 383 girls, played truant, with the proportion reaching its peak value of l00% among the 2l-year-olds, and showing an upward trend from 33.3% among the 14-year-olds to  97.4% among girls of 19. Another widespread phenomenon was stealing rides on city buses, trolley buses, or trams. Those who had stolen a ride at least once constituted 95.9% of the boys and 89.3% of the girls. Stealing rides on trains or intercity buses was much less widespread. It was admitted by 35.8% of the boys and 22% of the girls. Driving a car or motorcycle without a license or a motorbike without a bicycle permit was admitted by 52.6% of the boys and 29.9% of the girls. A further act we inquired about was painting or spraying walls, buses, bus seats and stops, etc. Such acts were admitted by 22.9% of the boys and 12.7% of the girls. Still another group of acts qualified as vandalism includes acts that result in destruction of or damage to property. The largest group of both boyg and girls tend to vandalise school furniture (22.3% of the boys and 13% of the girls), as well as trees, bushes and flowers in parks and squares (18.2 and 10.1% respectively). Asked whether they had ever carried any weapon, such as a knife, club, knuckle-duster, or gas pistol, 43.3% of the boys and 26.6% of the girls answered in the affirmative.             Relatively large were the proportions of boys (25.9%) and girls (10.7%) who had ever participated in brawls or group disturbances in a public place.             A proportion of 7.2% of the boys and 1.8% of the girls admitted having beaten a stranger. Cases of beating a family member were occasional: they were admitted by 1.4% of the boys and 0.6% of the girls. Also a small proportion of 3.3% of the boys and 1.3% of the girls admitted having wounded another person with a knife, club or another weapon. Intentional arson was admitted by 5.5% of the boys and 1.2% of the girls. Offenses against property or acts consisting in appropriation of property without the knowledge or consent of its owner were related frequent in the sample.             Of the 702 young persons, 55.1% had committed at least one of the listed fourteen categories of acts. This proportion is rather big the fact considered that average young people were examined. Of the 14 categories of acts against property consisting in its appropriation, the youth most often admitted shoplifting, purchasing stolen property, breaking and entering, and thefts at school. Questions relating to drugs concerned two points: the taking of drugs and their selling by respondents. The drugs inquired about were divided into two categories, each of them asked about separately: marihuana and hashish (the first category); and home-made poppy straw brew, heroin, cocaine and LSD (the second category). A proportion of 16.5% admitted having ever taken marihuana or hashish. Boys admitted this behawior more often than girls (with proportions of boys and girls balanced in the sample): every fifth boy and every eighth girl had experiences with this category of drugs. A much smaller proportion of 2% admitted having ever taken the second category of drugs. Answers stating that the respondent had ever taken marihuana or hashish were evenly distributed in the sample and tended to become more frequent with age. The declared use of the second category of drugs was very rare and evenly distributed in age groups from 16 to 21. Ten persons,  among them 9 boys, admitted having sold marihuana or hashish. Most were aged 16‒18, that is still went to school. They stated that the police had never learned about their doings. Four persons admitted having sold the second category of drugs. They had sold amphetamine, cocaine, or psychedelic drugs in their neighborhood. None had been caught at the act. Asked, “Have you ever drunk beer, wine, vodka or another alcoholic beverage?”, nearly the entire sample (95.9% of the boys and 94.7% of the girls) answered in the affirmative. Asked about the age of their first contact with alcohol, 3.7% mentioned the age of under ten; 19.8% ‒10‒14; 48.3% ‒ 14‒16; and 17.l% ‒ 17‒21. The proportion of respondents who had happened to get drunk at least once was 56.3%. Asked about drinking during the year preceding the survey, 93.6% said they had drunk in that period; 50.3% admitted having drunk on up to 10 occasions, 18.1%  ‒  on ll‒24 occasions, 10.6% ‒ on 25‒50 occasions, and 20.9% ‒ on over 50 occasions. The last time before the survey, the respondents drank: beer (43.8%), vodka (35.6%), wine (27.6%), and long drinks (10%). A majority of 86.5% drank in the company of others; under 10% had one companion, two-thirds of the rest drank in a group of 2‒10 persons, and the remaining ‒ in a larger company. In the international survey, national samples were examined in four countries (Switzerland, England and Wales, Portugal, and the Netherlands). In Spain, the survey concerned a large national urban sample. Examined in further two countries (Germany and North Ireland) were random samples from specific cities (Mannheim and Belfast respectively). Four other countries decided to examine a random sample of school youth from a specific city (Helsinki; three ltalian cities: Genova, Messina and Siena; Liege). The United States and New Zealand were left out from comparisons. Thus in principle the findings to be compared were not necessarily comparable. Yet it seems advisable to discuss the general trends shown in national surveys. What, therefore, are the similarities and dissimilarities between Poland and Western Europe? As regards the incidence of delinquency, considerable similarities can be noticed between findings of all national surveys but the English one. In surveys of city samples (those of school youth included), significant similarity can be noticed in the extent of delinquent acts “ever committed” by the young of Warsaw, Helsinki, and Athens. As regards the extent of acts committed “during last year”, the findings obtained in Warsaw are highly similar to those for Helsinki. In Athens, instead, the greatest extent of juvenile delinquency of all examined cities was found. A comparison of acts committed “during last year” indicates a similar intensity of offenses against property among the youth of Warsaw, Belfast, and Liege; as compared to Warsaw, a much greater extent of there offences is found in Helsinki and of Swiss youth, and a decidedly smaller one - in the English and Italian sample. Submitting offenses against property to a closer analysis, one notices that the Polish youth relatively more often commit acts consisting in “breaking and entering” as compared c.g. to young people in England, the Netherlands, or Finland: this type of act was committed at least once by 20.7% of the Polish sample, by 14.9% of the youth of Helsinki, by 3.4% of the English youth, and by 6.9% of the young Dutch. The extent of acts related to drugs (taking and trafficking), among Warsaw youth is similar to that among the young of Portugal and Helsinki, somewhat lower than among the Dutch and Spanish youth, much lower than among the English, Swiss, and Belfast young people, but higher than among the youth of Mannheim, Liege, Athens and the three Italian cities.
Źródło:
Archiwum Kryminologii; 1995, XXI; 81-103
0066-6890
2719-4280
Pojawia się w:
Archiwum Kryminologii
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Viability theory: an applied mathematics tool for achieving dynamic systems sustainability
Autorzy:
Krawczyk, Jacek B.
Pharo, Alastair S.
Powiązania:
https://bibliotekanauki.pl/articles/748128.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
viability theory, differential inclusions, sustainability
Opis:
 Sustainability is considered an issue of paramount importance; yet scientists andpoliticians still seek to understand what it means, practically and conceptually, tobe sustainable. This paper's aim is to introduce viability theory, a relativelyyoung branch of continuous mathematics which provides a conceptual frameworkthat is very well suited to sustainability problems.  In particular, viability theory can be used toanswer important questions about the sustainability of systems, including thosestudied in macroeconomics, and can be used to determine sustainable policies fortheir management.  The principal analytical tool of viability theory is theviability kernel which is the set of all state-space points such that it is possible for evolutions starting from each of those points to remain within the system's predetermined constraints indefinitely. Although, in some circumstances,  kernel determinationcan be performed analytically,  most practical results in viability theory rely on graphical approximations of viability kernels,which for nonlinear and high-dimensional problems can only be approached numerically.This paper provides an outline of the coreconcepts of viability theory and an overview of the numerical approachesavailable for computing approximate viability kernels.  \vikaasa{}, aspecialised software application developed by the authors and designed tocompute such approximate viability kernels is presented along-side examples ofviability theory in action in the spheres of bio-economics and macroeconomics.
Źródło:
Mathematica Applicanda; 2013, 41, 1
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the movement of broadcast on the concentration table
Autorzy:
Feliks, Jacek
Krawczyk, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2064429.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
concentration table
coefficient of friction
enrichment
tabela koncentracji
współczynnik tarcia
wzbogacanie
Opis:
The article attempts to analyze the work of the concentration table, on which the distribution of the material under investigation takes place. The efficiency of separation or otherwise enrichment depends on the drive that puts the concentration table plate into an asymmetrical reciprocating movement. The most frequently used solutions are concentration tables, on which the distribution of enriched material takes place in an aqueous medium commonly called wet enrichment. The AGH University of Science and Technology conducted simulation tests of material enrichment on a concentration table using the differences in friction coefficient commonly referred to as dry enrichment, i.e. without an additional medium. The article presents the effects of simulations that have been carried out for reference materials characterized by different friction coefficients and densities. The summary presents the analysis of obtained effects of computer simulations of material movement with different coefficients of friction. The simulations were carried out for variables: the frequency of vibrations of the concentration table and the angle of inclination of the table of the concentration table. It has been shown that it is possible to enrich the material by changing the above-mentioned operating parameters of the device.
Źródło:
New Trends in Production Engineering; 2019, 2, 1; 304--311
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of enlarging material to the concentration table
Autorzy:
Feliks, Jacek
Krawczyk, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2064376.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
concentration table
coefficient of friction
enrichment
tabela koncentracji
współczynnik tarcia
wzbogacanie
Opis:
Concentration tables are one of the oldest oscillatory enrichments with over 100 years of tradition. On this type of distribution tables are made according to material mass in many recurring cycles induced by appropriate drives. So-called wet tables are the devices most often used for coal enrichment in Polish mines because this process generates very high costs, high water consumption and pollution of the environment, as well as the need for, among others, water and mud management is increasingly being replaced mainly in areas poor in water by the modern model of the air concentration table - FGX produced in China. The process of enrichment on this type of table itself runs in a manner comparable to the method of wet enrichment with the difference that the FGX is distributed on a perforated plate, in this case we deal with air pollution. Department of Machinery Engineering and Transport's attempts to use the differences in coefficients of friction in over-resonance screens have shown that it is possible effective separation of grains with different coefficients of friction. The article presents a theoretical analysis and presents the results of performed dry enrichment trials using different coefficients of friction. The summary presents the advantages of using the enrichment method using the differences in friction coefficients and test results.
Źródło:
New Trends in Production Engineering; 2019, 2, 1; 59--68
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Segmentation of bone structures with the use of deep learning techniques
Autorzy:
Krawczyk, Zuzanna
Starzyński, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2173574.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
deep learning
semantic segmentation
U-net
FCN
ResNet
computed tomography
technika deep learning
głęboka nauka
segmentacja semantyczna
tomografia komputerowa
Opis:
The paper is focused on automatic segmentation task of bone structures out of CT data series of pelvic region. The authors trained and compared four different models of deep neural networks (FCN, PSPNet, U-net and Segnet) to perform the segmentation task of three following classes: background, patient outline and bones. The mean and class-wise Intersection over Union (IoU), Dice coefficient and pixel accuracy measures were evaluated for each network outcome. In the initial phase all of the networks were trained for 10 epochs. The most exact segmentation results were obtained with the use of U-net model, with mean IoU value equal to 93.2%. The results where further outperformed with the U-net model modification with ResNet50 model used as the encoder, trained by 30 epochs, which obtained following result: mIoU measure – 96.92%, “bone” class IoU – 92.87%, mDice coefficient – 98.41%, mDice coefficient for “bone” – 96.31%, mAccuracy – 99.85% and Accuracy for “bone” class – 99.92%.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e136751
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Segmentation of bone structures with the use of deep learning techniques
Autorzy:
Krawczyk, Zuzanna
Starzyński, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2128158.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
deep learning
semantic segmentation
U-net
FCN
ResNet
computed tomography
technika deep learning
głęboka nauka
segmentacja semantyczna
tomografia komputerowa
Opis:
The paper is focused on automatic segmentation task of bone structures out of CT data series of pelvic region. The authors trained and compared four different models of deep neural networks (FCN, PSPNet, U-net and Segnet) to perform the segmentation task of three following classes: background, patient outline and bones. The mean and class-wise Intersection over Union (IoU), Dice coefficient and pixel accuracy measures were evaluated for each network outcome. In the initial phase all of the networks were trained for 10 epochs. The most exact segmentation results were obtained with the use of U-net model, with mean IoU value equal to 93.2%. The results where further outperformed with the U-net model modification with ResNet50 model used as the encoder, trained by 30 epochs, which obtained following result: mIoU measure – 96.92%, “bone” class IoU – 92.87%, mDice coefficient – 98.41%, mDice coefficient for “bone” – 96.31%, mAccuracy – 99.85% and Accuracy for “bone” class – 99.92%.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e136751, 1--8
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water parameters and species composition of macrophytes in reclamation lakes in the area of a former sulphur borehole mine (SE Poland)
Autorzy:
Krawczyk, Rafał
Lis, Łukasz
Urbaniak, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/763851.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
post-mining lakes, sulphur mining, reclamation, aquatic vegetation, spontaneous succession, Jeziórko, SE Poland
Opis:
Macrophytes and selected physical-chemical water properties were studied in 17 post-mining lakes of Jeziórko Sulphur Mine – one of the largest borehole sulphur mines in the world. Artificial lakes were constructed in subsidence depressions during the reclamation process of mining fields. They were characterized by high mineralization – conductivity ranged from 723 to 2295 μS/cm. The reaction was near neutral, or more frequently, slightly alkaline. Concentrations of phosphorus and organic matter were low. In the group of hydrophytes, Ceratophyllum demersum, Myriophyllum spicatum, Najas marina, Utricularia vulgaris, Eleocharis acicularis, Potamogeton pectinatus, Potamogeton natans and Potamogeton pusillus were frequently dominant. In several lakes, large macroscopic algae dominated – charophytes forming large, dense Chara meadows. In marsh communities, Phragmites australis was the most expansive. Reclamation process had a positive effect on diversity, some of the species found in the study area are regionally rare, including one species which is threatened in Poland (Najas minor). No alien species were recorded.
Źródło:
Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia; 2016, 71, 1
2083-3563
0066-2232
Pojawia się w:
Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nowe możliwości zastosowania kompozytowych wstawek hamulcowych fr 510 typu ll w wagonach towarowych
New possibilities of application of composite brake shoes fr510 type ll in freight wagons
Autorzy:
Bułhak, Jacek
Wasilewski, Piotr
Krawczyk, Natasza
Powiązania:
https://bibliotekanauki.pl/articles/34112010.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
Tematy:
kompozytowa wstawka hamulcowa
wagon towarowy
hałas
redukcja
interoperacyjność kolei
przepisy
Unia Europejska
composite brake shoe
boxcar
noise
reduction
rail interoperability
regulations
European Union
Opis:
Artykuł dotyka kwestii redukcji hałasu toczenia emitowanego przez wagon towarowy poprzez zastosowanie kompozytowej wstawki hamulcowej. Przedstawiono możliwości zastosowania kompozytowej wstawki hamulcowej typu LL, nie posiadającej homologacji UIC, w wagonach towarowych poruszających się w transeuropejskim systemie kolei. Publikacja zawiera analizę obecnie obowiązujących w Unii Europejskiej przepisów, regulujących interoperacyjność kolei w zakresie układu hamulcowego oraz przedstawia sposób postępowania umożliwiający zastąpienie wstawek żeliwnych kompozytowymi w istniejącym taborze. W artykule zaprezentowano ponadto wyniki prób stanowiskowych i eksploatacyjnych kompozytowej wstawki hamulcowej FR510 przeprowadzone w Polsce i w Maroku oraz porównanie właściwości tego materiału z wynikami wstawek typu LL, które uzyskały homologację UIC w projekcie EuropeTrain.
The article presents the possibility to apply type LL composite brake shoes, which are not UIC-approved, in freight wagons being in service in trans-European rail system. The publication contains an analysis of the existing European Union law governing the interoperability of the rail system in the scope of the brake system and shows a feasible procedure that allows cast-iron brake shoes to be replaced with composite brake shoes in the existing rolling stock. The article presents the results of bench and field tests of the FR510 composite brake shoe conducted in Poland and Morocco and a comparison of the properties of this material to the results of LL-blocks that were approved in UIC project EuropeTrain.
Źródło:
Rail Vehicles/Pojazdy Szynowe; 2016, Nr 2; 49-59
0138-0370
2719-9630
Pojawia się w:
Rail Vehicles/Pojazdy Szynowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the impact of forging and trimming tools wear on the dimension-shape precision of forgings obtained in the process of manufacturing components for the automotive industry
Analiza wpływu zużycia narzędzi do kucia i okrawania na dokładność wymiarowo-kształtową odkuwek uzyskiwanych w procesie wytwarzania elementów dla przemysłu motoryzacyjnego
Autorzy:
Hawryluk, Marek
Kondracki, Piotr
Krawczyk, Jakub
Rychlik, Marcin
Ziemba, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1365240.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
trimming process
numerical simulation
geometric quality of forgings
wear of tools
process okrawania
symulacje numeryczne
jakość geometryczna odkuwek
zużycie narzędzi
Opis:
The study presents the results of an analysis of the manufacturing process of a yoke-type forging for automotive industry with the use of numerical modelling and 3D scanning techniques, taking into account the gradual wear of both forging tools and trimming to determine the mutual impact of their operation on the dimensional accuracy of the forgings. The performed analysis included the 4 variants which are that have the most common place in the industrial process that is, for a combination of new and partly worn out die inserts (used during hot forging) and new and partly used cutting tools used for cold trimming. The first stage involved modelling of a hot die forging process. Next, the obtained results were implemented into second modelling stage, which involved a simulation of a cold trimming process of a flash, with the use of the normalized Cockcroft-Latham fracture criterion, with the consideration of eliminating the removed elements, for which the cracking value has been exceeded. The obtained results was verified by means of a case study under industrial conditions for the least favourable operating conditions of both types of tools and their impact on the dimension-shape precision of the forgings. These results allowed for a more complete analysis of the trimming process for a variety of operating conditions and the confirmation of the correctness of carried out numerical modelling, and thus the possibility of its use in combination with scanning technique to computer-aided manufacturing processes. The proposed solution allows the selection of optimum conditions for implementation of the processes of forging and trimming because of their use to provide the required net shape forgings.
W pracy przedstawiono wyniki analizy procesu wytwarzania odkuwki typu rozwidlonego dla przemysłu motoryzacyjnego z wykorzystaniem modelowania numerycznego oraz technik skanowania 3D przy uwzględnieniu sukcesywnego zużywania się zarówno narzędzi do kucia, jak i do okrawania w celu określenia wzajemnego wpływu ich eksploatacji na dokładność wymiarową odkuwek. Przeprowadzona analiza obejmowała 4 warianty najczęściej występujące w procesie przemysłowym, czyli dla kombinacji nowych i częściowo wyeksploatowanych wkładek matrycowych (stosowanych podczas kucia na gorąco) oraz nowych i częściowo zużytych narzędzi okrojczych wykorzystywanych do okrawania na zimno. W pierwszym etapie zamodelowano proces kucia matrycowego na gorąco. Następnie uzyskane wyniki zaimplementowano do drugiego etapu modelowania, w którym zasymulowano proces okrawania na zimno wypływki przy zastosowaniu znormalizowanego kryterium pękania Cockcrofta-Lathama z uwzględnieniem eliminacji elementów, dla których została przekroczona wartość pękania. Uzyskane wyniki zostały zweryfikowane za pomocą studium przypadku w warunkach przemysłowych dla najmniej korzystnych warunków eksploatacji obu rodzajów narzędzi oraz ich wpływu na dokładność wymiarowo-kształtową odkuwki. Uzyskane wyniki pozwoliły na pełniejszą analizę procesu okrawania dla różnych warunków eksploatacyjnych oraz potwierdzenie poprawności przeprowadzonego modelowania numerycznego, a tym samym możliwości jego wykorzystania do komputerowego wspomagania procesów wytwarzania. Zaproponowane rozwiązanie pozwala na wybór optymalnych warunków realizacji procesów kucia i okrawania ze względu na ich eksploatację w celu zapewnienia wymaganej dokładności wymiarowo-kształtowej odkuwek.
Źródło:
Eksploatacja i Niezawodność; 2019, 21, 3; 476-484
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stratygraficzne i przestrzenne aspekty zróżnicowania składu chemicznego późnoplejstoceńskich sekwencji lessowo-glebowych w Polsce – przykłady profili w Tyszowcach i Białym Kościele
The stratigraphic and spatial aspects of the differentiation of the chemical composition of the Late Pleistocene loess-palaeosol sequences in Poland – a case study of the Tyszowce and Biały Kościół profiles
Autorzy:
Skurzyński, Jacek
Jary, Zdzisław
Raczyk, Jerzy
Moska, Piotr
Krawczyk, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/578343.pdf
Data publikacji:
2017
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
less,
gleba kopalna
geochemia
wskaźniki wietrzeniowe
metoda chemostratygraficzna
loess
palaeosol
geochemistry
weathering indices
chemostratigraphic method
Opis:
Artykuł prezentuje porównanie składu geochemicznego i stopnia zwietrzenia chemicznego dwóch późnoplejstoceńskich sekwencji lessowo-glebowych, zlokalizowanych w SE i SW Polsce. Analiza chemiczna w zakresie pierwiastków głównych (Si, Al, Fe, Mn, Mg, Ca, Na, K, Ti, P) oraz wyliczonych na ich podstawie wskaźników (CIA, Ti/Al, K/Al, Mg/Ca, K/Ca, Na/K oraz Si/Al) wykazała, że obie sekwencje są zróżnicowane zarówno w ujęciu stratygraficznym, jak i przestrzennym. Zmienność stratygraficzna związana jest ze zmianami paleoklimatu warunkującymi natężenie zarówno procesów lito-, jak i pedogenezy. Zmienność przestrzenna może wynikać m.in. z odmiennych warunków klimatycznych w trakcie tworzenia się sekwencji lessowo-glebowych, recyklingu lessów lub nawet odmiennego źródła materiału. Istotna może być też dysproporcja miąższości sekwencji, skutkująca zróżnicowanym wpływem infiltracji wód opadowych.
The article presents the comparison of the geochemical composition and the degree of chemical weathering between two Late Pleistocene loess-palaeosol sequences of SE and SW Poland. The results of major element (Si, Al, Fe, Mn, Mg, Ca, Na, K, Ti, P) and geochemical index (CIA, Ti/Al, K/Al, Mg/Ca, K/Ca, Na/K oraz Si/Al) analyses indicate stratigraphical and spatial differentiation between sequences. The stratigraphic differentiation is connected with palaeoclimatic conditions which control the intensity of pedogenesis. The spatial variability may be attributed to different climatic conditions during the deposition of loess, the loess recycling process, or even to different source areas. The disproportion between the thicknesses of the loess covers can also be important. It can affect the rainwater infiltration effect.
Źródło:
Acta Geographica Lodziensia; 2017, 106; 87-103
0065-1249
Pojawia się w:
Acta Geographica Lodziensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Color vision assessment following cataract surgery using anomaloscope
Autorzy:
Zabel, Jacek
Michalak, Krzysztof Piotr
Olszewski, Jan
Koszałkowski, Maciej
Przekoracka-Krawczyk, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2046657.pdf
Data publikacji:
2021-12-27
Wydawca:
Medical Education
Tematy:
cataract
color vision deficits
anomaloscope
Moreland test
Ray leigh test
Opis:
Aim: To evaluate the impact of cataract on color vision detection using an anomaloscope. Methods: 12 patients aged 64–82 years with history of cataract surgery in one eye and mature cataracts in the other eye were examined for color vision using the Rayleigh and the Moreland anomaloscope tests. Results: Different patterns of blue and green color vision deterioration have been observed in the eye with cataract as compared to the IOL eye. A decrease in M1 to approximately 1 (the minimum of the Moreland test scale) was observed in 5 out of 12 participants, whereas an increase in M2 to 99 (the maximum of the Moreland test scale) was observed in 6 out of 12 subjects. R1 found in the Rayleigh test was significantly lower in the cataract eyes as compared to the IOL eyes (38.9 ± 2.3 vs. 43.4 ± 1.6; p < 0.001). Conclusions: It has been shown that cataract causes a decrease in color sensitivity, especially affecting green and blue colors. Following IOL implantation, the previously deteriorated vision of green and blue was clearly improved. The most valuable parameters of the anomaloscope test, which enable to determine cataract severity, were M1, M2 and R1.
Źródło:
OphthaTherapy; 2021, 8, 4; 265-273
2353-7175
2543-9987
Pojawia się w:
OphthaTherapy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza numeryczna przepływu ziaren materiału sypkiego i gazu w energetyce – studium wybranych przypadków
Autorzy:
Zarzycki, Robert
Grajcar, Magdalena
Damasiewicz, Mariusz
Wiński, Mateusz
Smigielski, Jacek
Hepner, Wojciech
Kobyłecki, Rafał
Krawczyk, Piotr
Powiązania:
https://bibliotekanauki.pl/chapters/25418025.pdf
Data publikacji:
2023-12-07
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
modelowanie przepływów
fluidyzacja
kocioł fluidalny
kotły energetyczne
Opis:
W pracy przedstawiono problematykę modelowania przepływów materiału sypkiego i gazu na przykładzie kotła fluidalnego na parametry nadkrytyczne. Zaprezentowano podstawowe wiadomości o problematyce modelowania urządzeń energetycznych, w tym kotłów fluidalnych. Na podstawie wybranych przypadków dokonano analizy przepływu spalin i materiału cyrkulującego w leju komory paleniskowej, przepływu w komorze paleniskowej i cyklonach kotła. Na podstawie uzyskanych wyników można ocenić charakter przepływu materiału sypkiego i gazu w poszczególnych elementach kotła oraz zaproponować niezbędne modernizacje lub poprawę jego geometrii w celu ograniczenia występujących problemów.
Źródło:
Czysta energia i środowisko; 53-71
9788371939044
Dostawca treści:
Biblioteka Nauki
Artykuł

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