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Tytuł:
Transport Phenomena In Single Crystals Tl1−XIn1−XGeXSe2 (x=0.1, 0.2)
Zjawiska transportu w monokryształach Tl1-XIn1-XGeXSe2 (x=0.1, 0.2)
Autorzy:
Zamurueva, O. V.
Myronchuk, G. I.
Oźga, K.
Szota, M.
El-Naggar, A. M.
Albassam, A. A.
Parasyuk, O. V.
Piskach, L. V.
Kityk, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/357004.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Tl1−xIn1−xGexSe2 single crystal
chalcogenide crystals
transport features
photoinduced birefringence
electroconductivity mechanisms
Urbach rule
monokryształy TL1-xIn1-xGax Se2
zdelokalizowane nośniki
stany zlokalizowane
funkcje komunikacyjne w monokryształach
fotoindukowanie
przewodzenie elektryczne
zasada Urbacha
Opis:
Temperature dependences of electroconductivity for single crystals Tl1−xIn1−xGexSe2 were analyzed. It was established an occurrence of thermoactivated states within the temperature range 100-300 K. The conductivity is formed by delocalized carriers within the conductivity band and the jumping conductivity over the localized states which are situated in the narrow localized states near the Fermi level. Following the performed data the activation energy was evaluated with accuracy up to 0.02 eV. The density of the localized states as well as the distribution of the energy over the mentioned states was evaluated. Additionally the average distance between the localized states is evaluated at different temperatures.
Analizowano zależności temperaturowe przewodności elektrycznej dla monokryształów Tl1−xIn1−xGexSe2. Ustalono pojawienie się stanów termo-aktywnych w zakresie temperatur 100-300 K. Przewodnictwo tworzone jest przez zdelokalizowane nośniki w paśmie przewodnictwa i skoki przewodnictwa po stanach zlokalizowanych, znajdujących się w wąskich zlokalizowanych stanach w pobliżu poziomu energii Fermiego. Wartość energii aktywacji oszacowano z dokładnością do 0,02 eV. Wyznaczono wartości gęstości stanów zlokalizowanych, jak i rozkład energii na wymienionych stanach. Dodatkowo w różnych temperaturach oszacowano średnią odległość pomiędzy stanami zlokalizowanymi.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 3A; 2025-2028
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Certain Problems Concerning Environmental Impact Assessment of Wind Turbines in Scope of Acoustic Effects
Autorzy:
Wszołek, T.
Kłaczyński, M.
Mleczko, D.
Ozga, A.
Powiązania:
https://bibliotekanauki.pl/articles/1197516.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.58.+z
43.66.Lj
87.50.Y-
Opis:
The paper deals with difficulties that are encountered by investors and decision-making authorities in the course of investment processes involving construction of wind power plants. Moreover, attention is focused on absence of standardized procedures that could be used to determine environmental impact of wind turbines, mainly in the scope of acoustic effects appearing in conditions typical for operation of such devices (strong wind), high elevation of related noise sources, and the nature of the sound emission (tonality and amplitude modulation). Lack of such procedures is a source of serious ambiguities developing in assessment of all investment stages - planning and forecasting, construction, and operation. An additional problem arises in the case of power plants located in the vicinity of Natura 2000 area, where construction projects are often obstructed on the grounds of unclear criteria concerning, among other things, the effect of acoustic phenomena on birds, bats, and other animals. It follows from the research presented in this paper that the consistent system of procedures and criteria should be worked out on the grounds of long-term monitoring studies.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-38-A-44
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prototyp stacji pogodowej dla potrzeb leśnictwa - badania pilotażowe
Prototype of the weather station for the needs of forestry - a pilot study
Autorzy:
Szymański, P.
Szymański, M.
Śmieja, M.
Brach, M.
Ożga, W.
Powiązania:
https://bibliotekanauki.pl/articles/989036.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
meteorologia
lasy
pomiary meteorologiczne
stacja pogodowa
prototypy
badania pilotazowe
arduino™
stevenson screen
sensors meteorological parameters
forest
Opis:
The aim of the study was to design a weather station dedicated for applications in the forestry. The device is thought to be used to measure temperature, pressure, humidity and sunlight and to record that data to the microSD memory card supplementing also the information on the time of measurement. The objective of the field part of the study was to gather accurate meteorological data from the interior of the forest to the geostatistical analysis, necessary for breeding purposes. Here we present the assumptions for technical equipment and describe the components of the device, including the systems of sensor and control. In the further stage of the study we performed the comparative test of the prototype with a professional weather station. The results show a very strong correlation between data form both devices, while the average error relative is at a very satisfactory level: temperature (0.15°C), relative humidity (–3.73%), pressure (–3.37 hPa) and light intensity (–0.82 klx). The project proved that it is possible to construct simple and economically grounded weather station. The total cost of presented prototype does not exceed 500 PLN (ca. 110 US$). We suggest to continue further research and development of the network of similar weather stations. It may allow to create a model of meteorological factors for bigger areas.
Źródło:
Sylwan; 2017, 161, 05; 405-412
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preferencje osób odwiedzjących wybrane kompleksy leśne w zakresie turystyki leśnej i organizacji wypoczynku
The preferences of visitors to selected forest areas for tourism and recreational purposes
Autorzy:
Skłodowski, J.
Gołos, P.
Skłodowski, M.
Ożga, W.
Powiązania:
https://bibliotekanauki.pl/articles/1290584.pdf
Data publikacji:
2013
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lasy
funkcje lasu
funkcje rekreacyjne
turystyka lesna
wypoczynek
zagospodarowanie turystyczne
opinia spoleczna
preferencje uzytkownikow
preferencje turystyczno-rekreacyjne
Opis:
Questionnaire surveys were conducted from July 1st to August 15th, 2012 in forests near Gołdap, Białowieża, Pisz, Kraoenik, Warsaw and Zakopane with 335 respondents – 146 residents (43.6%) and 189 tourists (56.4%). The respondents declared that they visit forests throughout the year for various purposes, most often with family or friends and most frequently for the recreational activity of walking. They typically spend about three hours in the forest during a single visit. Respondents perceived the most important functions of the forest as a place where plants and animals live, as well as a place for recreation. In their view, the state budget should be a source of co-financing the recreational management of the forest. Only a small number of respondents (27.5%) would be willing to allocate a portion of their income for recreational forest management. According to the respondents, the most important elements needed in the forest to improve its quality for tourism are information signs and litter bins. Respondents perceive the greatest threats to the forest from tourism to be vandalism, automobiles driving into the forest and wildlife disturbance, whereas the greatest threats to tourists were reported to be biting and stinging animals (snakes, ticks and mosquitoes) and the possibility of getting lost. Respondents indicated clean air, peace and quiet, as well as the ability to harvest wild fruits, plants and mushrooms as the greatest advantages of using the forest for recreation. A large proportion of respondents admitted that they would like to use the services of professional foresters, especially for nature walks and health related purposes, as well as to educate children and youth about nature and the forest.
Źródło:
Leśne Prace Badawcze; 2013, 74, 4
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrective factors of intestinal microflora disorders in the perinatal period
Autorzy:
Pisaniak, P.
Huflejt, M.
Gurowiec, P.J.
Ozga, D.
Powiązania:
https://bibliotekanauki.pl/articles/2088221.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
caesarean section
intenstial microflora
vaginal seeding
breastfeeding
probiotics
Opis:
Intestinal microflora is found at approximately 10⁴ bacteria per ml of intestinal fluid. Although this ecosystem is very diverse with dynamic changes taking place within it, there is a certain stability in the type and number of species, referred to as the core microbiome, found in 95% of the human population. Genetic variation of microorganisms is relatively small, and their functions are strictly defined and highly conservative. The microbiome exists symbiotically with the host, protecting it against colonization by pathogenic microorganisms, providing essential metabolites, and stimulating the immune system. Colonization begins prenatally and its development is greatly influenced by the course of pregnancy, method of delivery, food supplied to the child during the first moments of life, and post-birth environment. The appropriate intestinal microflora composition is a key determinant of health and homeostasis, and any intestinal dysbiosis can be associated later in life with the development of obesity, diabetes, allergies or cancer. Due to the increasing number of hospitalised pregnancies and deliveries, affecting the intestinal microflora of a newborn, efforts are being made to minimize this process and restore the newborn’s microbiome. The use of the Vaginal seeding procedure raises up great hopes, but also some fears concerning its safety. Some very simple and most natural factors have been recently also appreciated and promoted, such as breastfeeding or direct contact of the baby’s skin with the mother’s skin, which are allies to probiotic bacteria. The purpose of this paper is to emphasize the importance of microbial colonization of the human body and to present the latest and most effective procedures that are designed to correct the existing dysbiosis or to reduce the risk of its occurrence. The literature for the compilation of this study has been obtained from databases such as PubMed, Google Scholar, Web of Science.
Źródło:
Medical Science Pulse; 2019, 13, 3; 68-71
2544-1558
2544-1620
Pojawia się w:
Medical Science Pulse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Use of Granulation to Reduce Dusting and Manage of Fine Coal
Autorzy:
Ozga, M.
Borowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/125398.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
granulation
fine coal
dusting
management
solid fuels
Opis:
The development of mining and processing industries is accompanied by the formation of fine-grained waste materials that must undergo the treatment. Sometimes, grinding materials is a prerequisite for further processing. The issues of coal dust and fine coal granulation conducted to obtain homogeneous and persistent pieces for application in various branches of industry were presented. The article describes the binders and additives were applied in order to change the properties of the granules. The key factors affecting the process of fine-grained coal granulation is discussed. Granulated coal dust is most useful as an alternative fuel for combustion in industrial and household heating systems. However, carbon fuel requires a systematic control of the mechanical strength and resistance to external factors.
Źródło:
Journal of Ecological Engineering; 2018, 19, 3; 218-224
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of the attitudes and behaviours of employees in the context of safe operation of buildings on the example of the University of Agribusiness in Lomza
Autorzy:
Obolewicz, J.
Baryłka, A.
Szota, M.
Oźga, K.
Powiązania:
https://bibliotekanauki.pl/articles/2201077.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
developing nations
promoting
global industrial
economic infrastructure
international research
teaching
kraje rozwijające się
promowanie
globalny przemysł
infrastruktura gospodarcza
międzynarodowe projekty badawcze
nauczanie
Opis:
Purpose The issue of shaping the attitude of employee involvement in an organisation is a relatively new area of scientific interest. Shaping employees' attitudes, understood as a conscious influence to consolidate or change them so that they are conducive to the safe operation of building objects, should be of significant importance for any organisation. Attitude is related to behaviour, the most elementary form of human activity, which is externally observable. Design/methodology/approach Statistical analysis. Findings The issue of shaping organisational attitudes and behaviours is related to the need to consider the factors that trigger the change process. It is important to diagnose whether the engine of change is the person with a specific attitude or elements from his environment. Research limitations/implications The article presents a theoretical introduction and the results of diagnostic tests. It proposes actions shaping the attitudes and behaviour of employees regarding the safe operation of buildings, based on the example of the University of Agribusiness in Lomza. Practical implications The classical approach to the safety of buildings focuses primarily on the technical and engineering side of the building. Planners, designers, contractors, and users of buildings strive to make them the least hazardous to health and life, especially during the operation of the building. At the same time, it is important to bear in mind that safe operation is influenced by the behaviour of facility users, as they are the weakest link in management. Consequently, this is where the reserves for raising the health and safety of building users to a higher level still lie. Originality/value One of the main factors significantly influencing how an individual will behave when placed in a risky situation is how they perceive the risks involved. People's beliefs about various things can influence their behaviour more strongly than objective reality. To activate the reserves hidden in human behaviour to improve the safety level of buildings, it is necessary to fully recognise the causes and mechanisms that lead users to risky actions. Those behaviours allow the application of appropriate training and supervision methods, and more broadly of management methods, which would induce users to behave safely and to react consciously, directly or indirectly, to emerging risks during the operation of the works.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2022, 115, 2; 64--74
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Structural Stability of the Fe36 Co36 Si19 B5 Nb4 Bulk Amorphous Alloy
Stabilność struktury masywnego stopu amorficznego Fe36 Co36 Si19 B5 Nb4
Autorzy:
Nabiałek, M.
Pietrusiewicz, P.
Szota, M.
Dobrzańska-Danikiewicz, A.
Lesz, S.
Dośpiał, M.
Błoch, K
Oźga, K.
Powiązania:
https://bibliotekanauki.pl/articles/354967.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bulk amorphous alloys
surface
diffusion process
microstructure
fracture surface morphology
masywny stop amorficzny
powierzchnia
proces dyfuzji
mikrostruktura
Opis:
In this paper, the results of the investigation into the fractured surface microstructure of the amorphous samples of Fe36 Co36 Si19 B5 Nb4 in the shape of rods of diameters: 1 mm, 2 mm and 3 mm in the as-cast state are presented. The samples were prepared by injection of molten alloy into cooled copper dies. The process of diffusion in the investigated material has a different speed depending on the temperature gradient within the volume of the rod. The atomic diffusion leads to the creation of different zones within the rod fracture: the zone in contact with the copper die, the intermediate fracture zone, and the zone in the vicinity of the rod core; the three zones have been found to exhibit different amorphous structures.
W pracy przedstawiono wyniki badań mikrostruktury na powierzchni przełomów próbek Fe36 Co36 Si19 B5 Nb4 amorficznych w postaci prętów o średnicy 1 mm. 2 mm i 3 mm. w stanie po zestaleniu. Pręty wytworzono metodą wtłaczania ciekłego stopu do miedzianej, chłodzonej cieczą formy. Proces dyfuzji atomów w badanym materiale charakteryzuje się inną dynamiką w zależności od gradientu temperatury w objętości pręta. Wyróżnia się trzy wyraźnie widoczne strefy: od kontaktu z miedzianą formą, strefę przejściową oraz strefę opisującą rdzeń pręta. Każdą z wyróżnionych stref charakteryzują różne konfiguracje atomów w zakresie stanu amorficznego. Na podstawie badań stwierdzono, że w masywnych materiałach amorficznych występuje fluktuacja składu oraz gęstości w zależności od szybkości chłodzenia.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 1; 259-262
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoinduced Optical Properties Of Tl1-xIn1-xSixSe2 Single Crystals
Indukowane światłem właściwości optyczne monokryształów Tl1-xIn1-xSixSe2
Autorzy:
Myronchuk, G. L.
Zamurueva, O. V.
Oźga, K.
Szota, M.
El-Naggar, N. S.
Alzayed, N. S.
Piskach, L. V.
Parasyuk, O. V.
Albassam, A. A.
Fedorchuk, A. O.
Kityk, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/352746.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Tl1-xIn1-xSixSe2 single crystal
chalcogenide crystals
optical properties
photoinduced absorption
dark electroconductivity
electroconductivity mechanisms
monokryształy Tl1-xIn1-xSixSe2
kryształy soli tlenowców
właściwości optyczne
absorpcja fotoindukowana
ciemna przewodność elektryczna
mechanizmy przewodności elektrycznej
Opis:
The influence of temperature on electroconductivity and photoinduced changes of the absorption at 0.15 eV under influence of the second harmonic generation of CO2 laser for the two type of single crystals were investigated. The single crystals Tl1−xIn1−xSixSe2 (x=0.1 and 0.2) have been grown by the two-zone Bridgaman-Stockbarger method. The temperature studies of electroconductivity were done in cryostat with thermoregulation in the temperature 77 - 300 K, with stabilization ±0.1 K. Photoinduced treatment of the investigated single crystals were performed using the 180 ns pulses second harmonic generation of the CO2 laser operating at 5.3 μm. Experimental studies have shown that for the Tl1−xIn1−xSixSe2 single crystals with decreasing temperature from 300 up to 240 K and from 315 up to 270 K the conductivity is realized by thermally excited impurities with activation energies equal to about 0.24 eV and 0.22 eV for x= 0.1 and 0.2, respectively. Photoinduced absorption achieves its maximum at a power density below 100 mJ/cm2. Has been shown that the samples with x=0.2 demonstrated higher changes of the photoinduced absorption with respect to the x=0.1. With further decreasing temperature is observed monotonic decrease in the activation energy of conductivity. The origin of these effects is caused by the excitations of both the electronic as well as phonon subsystem. At some power densities the anharmonic excitations become dominant and as a consequence the photoinduced absorption dependence is saturated what were observed. Additionally, we were evaluated at given temperature the average jump length of R for localized states near Fermi level.
W pracy badano wpływ temperatury na przewodnictwo elektryczne oraz indukowane światłem zmiany absorpcji optycznej przy 0.15 eV, pod działaniem drugiej harmonicznej lasera CO2 dla dwóch typów monokryształów. Monokryształy Tl1−xIn1−xSixSe2 (x=0.1 i 0.2) otrzymano w pionowym dwustrefowym piecu metodą Bridgamana-Stockbargera. Badania temperaturowe przewodności elektrycznej przeprowadzono w kriostacie z termoregulacją, w temperaturze 77-300 K, przy stabilizacji ±0,1 K. Fotoindukowaną obróbkę laserową monokryształów wykonano przy użyciu 180 ns impulsów drugiej harmonicznej lasera CO2 o długości fali 5,3 μm. Eksperymentalnie wykazano, że z obniżaniem temperatury od 300 do 240 K i od 315 do 270 K przewodnictwo elektryczne monokryształów Tl1−xIn1−xSixSe2 jest wywołane przez wzbudzenia termicznie domieszek z energią aktywacji równą około 0,24 eV i 0,22 eV dla ő = 0,1 i 0,2, odpowiednio. Indukowana optycznie absorpcja osiąga maksimum przy gęstości mocy poniżej 100 mJ/cm2. Stwierdzono, że próbka z x = 0,2 wykazuje większe zmiany absorpcji indukowanej światłem w porównaniu do próbki z x = 0.1. Z dalszym spadkiem temperatury obserwowano monotoniczny spadek energii aktywacji przewodnictwa. Pochodzenie tych efektów jest spowodowane przez wzbudzanie zarówno podsystemu elektronowego jak i fonononowego. Przy niektórych gęstościach mocy wzbudzenia anharmoniczne zaczynają dominować, co w konsekwencji prowadzi do nasycenia indukowanej światłem zależności absorpcji optycznej. Dodatkowo w pracy wyznaczono dla danej temperatury średnią długość skoku R dla stanów zlokalizowanych w pobliżu poziomu Fermiego.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2A; 1051-1055
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Relationship between the Monomer Chain Length and the Electro-Optical Properties of Polymer Dispersed Liquid Crystals
Autorzy:
Liu, J.
Ozga, K.
Liu, X.
Zhen, Z.
Plucinski, K. J.
Szota, M.
Kityk, I. V.
Powiązania:
https://bibliotekanauki.pl/articles/958219.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
liquid crystal
electro-optical property
polymer dispersed
mesh size
response time
Opis:
Five polymers dispersed liquid crystalline (LC) films were fabricated using photo-polymerizable monomers with different lengths of carbon chains. These LC films have shown different electro-optical (EO) properties. Through their SEM pictures, the relationship between the linear electro-optical effect and the mesh size of the polymer network was explored. With the increase of number of photo-polymerizable monomers, the mesh size of the polymer network would become larger. So the liquid crystal molecules would be easily oriented in the electric field and therefore, the threshold voltage and saturation voltage would decrease. The open state response times were also reduced and the off state response times would be extended. The DFT simulations have shown principal role of the ground state dipole moments in the observed electro-optical efficiency.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 457-460
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmienność wzrostu promieniowego czterech proweniencji świerka pospolitego w warunkach środkowej Polski
Variation of radial growth of four Norway spruce provenances in central Poland
Autorzy:
Klisz, M.
Jastrzębowski, S.
Chojnacka-Ożga, L.
Kowalczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1312093.pdf
Data publikacji:
2015
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
drzewa lesne
dendroklimatologia
doswiadczenia proweniencyjne
swierk pospolity
Picea abies
proweniencje
przyrost drzew
przyrosty radialne
lata wskaznikowe
chronologie rezydualne
chronologie rzeczywiste
czynniki klimatyczne
dendrochronology
climate
pointer years
spruceless area
Opis:
The purpose of this study was to determine the growth variability of four provenances of Picea abies on experimental plots in the Wyszków Forest District, central Poland. The experiment was established as a system of random blocks with four repetitions per block. We selected 48 trees from each provenance and the increment cores were colected from sample trees. Standard measurements of the width of annual increments were performed using the WinDendro software. Raw data was then indexed and subject to dendroclimatic analyses based on the average monthly temperatures and precipitation of the period from 1969 to 2012. Furthermore, the COFECHA software was used to check the consistency of the data and to determine the pointer years. High data consistency as well as growth variability of particular provenances in response to climatic conditions were observed. The results obtained here will allow for an improved selection of populations best suited for growing in the climate of central Poland.
Źródło:
Leśne Prace Badawcze; 2015, 76, 1; 59-65
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected risk factors for ischemic heart disease and the success of treatment in patients with STEMI myocardial infarction treated with percutaneous coronary intervention
Autorzy:
Jędrzejczyk-Cwanek, M.
Gurowiec, P.J.
Ozga, D.
Powiązania:
https://bibliotekanauki.pl/articles/2087710.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
myocardial infarction
risk factors
ischemic heart disease
Opis:
Background: Coronary heart disease is one of the most common causes of hospitalization and premature deaths in Europe. ST-segment elevation myocardial infarction (STEMI) has been a clinical problem for many years, particularly in the aspect of choosing the optimal treatment method. The success of treatment is determined by many factors, including risk factors for ischemic heart disease, time between onset of symptoms and initiation of treatment, number and degree of coronary stenosis, and many more. Aim of the study: The aim of the study was to identify risk factors for ischemic heart disease affecting the success of STEMI patients treated with percutaneous coronary intervention (PCI). Material and methods: A retrospective analysis was carried out on data from medical records of patients treated in the Department of Acute Coronary Syndromes of St. Hedvig Provincial Hospital No. 2 in Rzeszow between 2009 and 2014. The research tool used in this paper was the author’s questionnaire. A total of 508 patients with STEMI myocardial infarction treated in the Department of Acute Coronary Syndromes (ACS) between 2009 and 2013 were included in the analysis. The inclusion criteria were the complete and clear files of patient treatment in the ACS department between 2009 and 2013 due to acute coronary syndrome treated invasively by the PCI method. Results: Majority of the study group, 334 subjects, (65.7%) had hypertension. The most common risk factors for ischemic heart disease were found to be dyslipidemia in 176 subjects (34.6%) and smoking in 163 subjects (32.1%). This paper presents the results of the analysis of the success of treatment in relation to risk factors for ischemic heart disease. There was a statistically significant relationship between hypertension and successful treatment (p=0.0425). More cases in which treatment was unsuccessful were observed in the group of patients who had no previous treatment for lipid disorders (20.2% vs. 4.0%) (p = 0.0000). Significantly more cases of treatment failure were found among people who denied smoking (17.4% vs. 8.6%; p = 0.0087). Conclusions: Among the analyzed behavioral and somatic risk factors for failure in patients subjected to treatment were untreated hypertension, hyperlipidemia and a negative history of cigarette smoking.
Źródło:
Medical Science Pulse; 2020, 14, 3; 49-54
2544-1558
2544-1620
Pojawia się w:
Medical Science Pulse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining the Distribution of Stochastic Impulses Acting on a High Frequency System through an Analysis of Its Vibrations
Autorzy:
Jabłoński, M.
Ozga, A.
Korbiel, T.
Pawlik, P.
Powiązania:
https://bibliotekanauki.pl/articles/1504209.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
45.10.-b
45.30.+s
Opis:
The motion of an oscillator with damping excited by impulses has the form $ξ_t = \frac{1}{\sqrt{a^2 - b^2}} \sum_{0
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 977-980
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determining the Distribution of Values of Stochastic Impulses Acting on a Discrete System in Relation to Their Intensity
Autorzy:
Jabłoński, M.
Ozga, A.
Powiązania:
https://bibliotekanauki.pl/articles/1490330.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
45.10.-b
45.30.+s
Opis:
In our previous works we introduced and applied a mathematical model that allowed us to calculate the approximate distribution of the values of stochastic impulses $η_{i}$ forcing vibrations of an oscillator with damping from the trajectory of its movement. The mathematical model describes correctly the functioning of a physical RLC system if the coefficient of damping is large and the intensity λ of impulses is small. It is so because the inflow of energy is small and behaviour of RLC is stable. In this paper we are going to present some experiments which characterize the behaviour of an oscillator RLC in relation to the intensity parameter λ, precisely to λ E(η). The parameter λ is a constant in the exponential distribution of random variables $τ_{i}$, where $τ_{i} = t_{i} - t_{i - 1}$, i = 1, 2, ... are intervals between successive impulses.
Źródło:
Acta Physica Polonica A; 2012, 121, 1A; A-174-A-178
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of Stochastic Impulses Acting on an Oscillator as a Function of Its Motion
Autorzy:
Jabłoński, M.
Ozga, A.
Powiązania:
https://bibliotekanauki.pl/articles/1537460.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
45.10.-b
45.30.+s
Opis:
In previous papers formulas have been derived describing distribution of a random variable whose values are positions of an oscillator at the moment t, which, in the interval [0, t], underwent the influence of stochastic impulses with a given distribution. In this paper we present reasoning leading to an opposite inference thanks to which, knowing the course of the oscillator, we can find the approximation of distribution of stochastic impulses acting on it. It turns out that in the case of an oscillator with damping the stochastic process $ξ_{t}$ of its deviations at the moment t is a stationary and ergodic process for large t. Thanks to this, time average of almost every trajectory of the process, which is the n-th power of $ξ_{t}$ is very close to the mean value of $ξ_{t}^{n}$ in space for sufficiently large t. Thus, having a course of a real oscillator and theoretical formulae for the characteristic function $ξ_{t}$ we are able to calculate the approximate distribution of stochastic impulses forcing the oscillator.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 74-77
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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