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    Wyświetlanie 1-10 z 10
    Tytuł:
    Disadvantages Connected With the Development of Tourism in the Contemporary World and the Concept of Sustainable Tourism
    Dysfunkcje rozwoju turystyki we współczesnym świecie oraz koncepcja zrównoważonego rozwoju turystyki
    Autorzy:
    Podhorodecka, Katarzyna
    Dudek, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/371582.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Komitet Człowiek i Środowisko PAN
    Tematy:
    tourism disadvantages
    economic disadvantages
    natural threats
    social disadvantages
    dysfunkcje turystyki
    niekorzyści ekonomiczne
    zagrożenia przyrodnicze
    społeczne dysfunkcje
    Opis:
    This article describes the natural, social and economic disadvantages of the development of tourism around the world. A review was also carried out of the basic indices describing volume of tourist traffic including the tourism intensity index, Baretje-Defert’s index, Defert’s index, and Charvat’s index), in terms of their usage in measuring the level of threat of tourism-related disadvantages. Areas that are much more vulnerable to a magnitude of disadvantages associated with the development of tourism are indicated and an attempt is made to determine which of the disadvantages (social, economic or natural) pose the greatest threat to the tourist-receiving area. The concept of sustainable tourism and the possibility of solving the disadvantages problems was presented. In addition, an answer is sought to the question of which indices can describe and monitor the level of tourism development disadvantage in the social, economic and natural spheres.
    W niniejszym artykule dokonano charakterystyki naturalnych, społecznych oraz ekonomicznych dysfunkcji rozwoju turystyki na świecie. Wykonano także przegląd podstawowych wskaźników opisujących wielkość ruchu turystycznego (m. in. wskaźnik intensywności ruchu turystycznego, Baretje’a-Defereta, Defereta, Chavarata) pod kątem ich wykorzystania do mierzenia poziomu zagrożenia występowania dysfunkcją turystyki. Wskazano obszary, które są znacznie bardziej narażone na ogrom dysfunkcji związanej z rozwojem turystyki oraz podjęto próbę ustalenia, które z dysfunkcji (społeczne, ekonomiczne czy przyrodnicze) stanowią największe zagrożenie dla obszaru recepcji ruchu turystycznego? Ponadto szukano odpowiedzi na pytania: które wskaźniki mogą opisywać i monitorować poziom dysfunkcji rozwoju turystyki w zakresie społecznym, ekonomicznym i przyrodniczym?
    Źródło:
    Problemy Ekorozwoju; 2019, 14, 2; 45-55
    1895-6912
    Pojawia się w:
    Problemy Ekorozwoju
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The development of tourism in protected areas and the exploitation of the natural environment by local communities in Africa and Asia
    Autorzy:
    Dudek, Anna
    Kwiatkowska, Joanna M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2029412.pdf
    Data publikacji:
    2004-06-01
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    national park
    tourism
    natural environment exploitation
    local communities
    Comoé National Park
    Salonga National Park
    Amboseli National Park
    Volcanoes National Park
    Khao Yai National Park
    Mgahinga National Park
    Opis:
    From an economic point of view, protected areas do not bring in high profits, in comparison to other possible ways of land usage. National parks and nature reserves are costly in their creation, as well as in their subsequent upkeep and management. In developing countries, their operation can be the source of many political and economic problems. Usually, local communities neighboring protected areas perceive the existence of a protected zone negatively, although they are often able to avail themselves of park resources in various ways. Besides being given the opportunity to rationally make use of certain park resources, community members may be employed as park attendants, which is a practice that is widespread. A part of the profits obtained from the developing tourist industry may be allocated towards local development programs, e.g. the building of a new hospital or school. Some national parks, while lacking the adequate infrastructure necessary for tourism, grapple with a lack of funds. The lack of earning opportunities in connection with the development of tourism results in the local community's over-exploitation of park resources. This often manifests itself in an increased incidence of poaching in the protected area.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2004, 11; 263-269
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Bahadur Representation of Quantiles for a Sample from ρ*-Mixing Structure Population
    Autorzy:
    Dudek, Dagmara
    Kuczmaszewska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2201721.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    quantiles
    Bahadur representation
    asymptotic normality
    Berry-Esseen type bound
    Berry-Esseen
    ρ*-mixing random variables
    Opis:
    In this paper, we establish the strong consistency and the Bahadur representation of sample quantiles for ρ*-mixing random variables. Additionally, the asymptotic normality and the Berry-Esseen bound of sample quantiles for ρ*-mixing random variables are presented. Additionally, we provide the rate of convergence of sample quantiles to population counterparts. Moreover, numerical simulation is presented to ilustrate and verify obtained results.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 3; 316--330
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detector diode circuit noise measurement and power supply method selection for the fiber optic seismograph
    Autorzy:
    Niespodziany, Sławomir
    Kurzych, Anna T.
    Dudek, Michal
    Powiązania:
    https://bibliotekanauki.pl/articles/1818211.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    fiber optic sensor
    fibre optic rotational seismograph
    closed loop
    detector diode
    avalanche photodiode
    noise
    spectral density
    Opis:
    This paper investigates the noise levels present at various points in the FOSREM type fiber optic seismograph. The main aim of this research was to discover magnitudes of noise, introduced by various components of the analog and optical circuits of the device. First, the noise present in the electronic circuit without any optics connected is measured. Further experiments show noise levels including the detector diode not illuminated and illuminated. Additional tests were carried out to prove the necessity of analog circuitry shielding. All measurements were repeated using three powering scenarios which investigated the influence of power supply selection on noise. The results show that the electronic components provide a sufficient margin for the use of an even more precise detector diode. The total noise density of the whole device is lower than 4⋅10⁻⁷ rad/(s√Hz). The use of a dedicated Insulating Power Converter as a power supply shows possible advantages, but further experiments should be conducted to provide explicit thermic confirmation of these gains.
    Źródło:
    Opto-Electronics Review; 2021, 29, 2; 71--79
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A test performance of optical fibre sensors for real-time investigations of rotational seismic events: a case study in laboratory and field conditions
    Autorzy:
    Jaroszewicz, Leszek R.
    Dudek, Michał
    Kurzych, Anna T.
    Teisseyre, Krzysztof P
    Powiązania:
    https://bibliotekanauki.pl/articles/2063893.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    sagnac effect
    field tests
    rotational seismology
    fibre optic seismograph
    rotation rate
    signal analysis
    Opis:
    Preliminary results of laboratory and field tests of fibre optic rotational seismographs designed for rotational seismology are presented. In order to meet new directions of the research in this field, there is clearly a great need for suitable and extremely sensitive wideband sensors. The presented rotational seismographs based on the fibre optic gyroscopes show significant advantages over other sensor technologies when used in the seismological applications. Although the presented results are prepared for systems designed to record strong events expected by the so-called “engineering seismology”, the described system modification shows that it is possible to construct a device suitable for weak events monitoring expected by basic seismological research. The presented sensors are characterized, first and foremost, by a wide measuring range. They detect signals with amplitudes ranging from several dozen nrad/s up to even few rad/s and frequencies from 0.01 Hz to 100 Hz. The performed Allan variance analysis indicates the sensors main parameters: angle random walk in the range of 3 ∙ 10−8–2 ∙ 10−7 rad/s and bias instability in the range of 2 ∙ 10−9–2 ∙ 10−8 rad/s depending on the device. The results concerning the registration of rotational seismic events by the systems located in Książ Castle, Poland, as well as in the coalmine “Ignacy” in Rybnik, Poland were also presented and analysed.
    Źródło:
    Opto-Electronics Review; 2021, 29, 4; 213--219
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards uniformity of rotational events recording : initial data from common test engaging more than 40 sensors including a wide number of fiber-optic rotational seismometers
    Autorzy:
    Kurzych, Anna
    Jaroszewicz, Leszek R.
    Dudek, Michał
    Sakowicz, Bartosz
    Kowalski, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1818206.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    seismometer
    optical fiber interferometer
    recording
    rotational seismology
    Opis:
    Rotational seismology is one of the fastest developing fields of science nowadays with strongly recognized significance. Capability of monitoring rotational ground motions represents a crucial aspect of improving civil safety and efficiency of seismological data gathering. The correct sensing network selection is very important for reliable data acquisition. This paper presents initial data obtained during the international research study which has involved more than 40 various rotational sensors collected in one place. The key novelty of this experiment was the possibility to compare data gathered by completely different rotational sensors during artificially generated ground vibrations. Authors collected data by four interferometric optical fiber sensors, Fiber-Optic System for Rotational Events & Phenomena Monitoring (FOSREM), which are mobile rotational seismographs with a wide measuring range from 10⁻⁷ rad/s up to even few rad/s, sensitive only to the rotational component of the ground movement. Presented experimental results show that FOSREMs are competitive in rotational events recording compared with the state-of-the-art rotational sensors but their operation still should be improved.
    Źródło:
    Opto-Electronics Review; 2021, 29, 1; 39--44
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Glutathione level and glutathione reductase activity in serum of coronary heart disease patients
    Autorzy:
    Zuzak, Ewa
    Horecka, Anna
    Kiełczykowska, Małgorzata
    Dudek, Aneta
    Musik, Irena
    Kurzepa, Joanna
    Kurzepa, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/972495.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    glutathione reductase
    glutathione
    coronary heart disease
    oxidative stress
    Opis:
    Introduction. Oxidative stress induced by the generation of excess reactive oxygen species is one of the cause of atherosclerosis finally leading to coronary heart disease (CHD). Glutathione reductase (GR), a flavoprotein antioxidant enzyme, regenerates glutathione (GSH) from its oxidized form, which is essential for scavenging of hydrogen peroxide by glutathione peroxidase. The aim of this study was to analyze the activity of GR and GSH level in serum of patients with various stages of CHD. Materials and method. Sixty consecutive patients with diagnosis of stable angina (SA, n=20), unstable angina (UA, n=20) and non-fatal myocardial infarction (MI, n=20) together with 20 healthy control subjects were enrolled. Venous blood samples were collected just before the coronary catheterization procedure (in study patients). GR activities and GSH concentration was determined using commercially available colorimetric kits. Results. The highest GR activity and GSH serum level was noticed in UA patients. However, statistical evaluation showed that only glutathione reductase activity was significantly higher in serum obtained from myocardial infarction patients, compared to stable angina pectoris patients (19.52 ± 13.88 vs 11.63 ± 5.45 nmol/min/ml for MI and SA, respectively; p<0.048). There were no significant differences in GSH between the CHD patients and controls. Conclusion. The elevated activity of glutathione reductase in serum of patients with unstable angina pectoris and myocardial infarction suggests the role of antioxidant system acute coronary syndromes.
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2017, 11, 2; 103-105
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vapour permeation study of water and ethanol through crosslinked chitosan and alginate membranes
    Autorzy:
    Turczyn, Roman
    Gnus, Małgorzata
    Dudek, Gabriela
    Tórz, Artur
    Łącka, Dorota
    Strzelewicz, Anna
    Łapkowski, Mieczysław
    Powiązania:
    https://bibliotekanauki.pl/articles/1034919.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    alginate
    chitosan
    crosslinking agents
    vapour permeation
    Opis:
    A vapour permeation of water and ethanol through homogenous chitosan and alginate membranes was investigated. The influence of the polymer matrix and crosslinking agents, and measurement protocol on the transport properties were discussed. The conducted experiments showed the greater separation factor, better stability and resistant to solvents for chemically crosslinked membranes. On the other hand, stronger association of the matrix, than the physical, caused decrease of vapour fluxes.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 281-288
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The correlation between selected anthropometric indices and BIA - based body fat measures in nursing home women aged 80+ years
    Autorzy:
    Zarzeczny, Ryszard
    Nawrat - Szołtysik, Agnieszka
    Polak, Anna
    Maliszewski, Jakub
    Kiełtyka, Adam
    Matyja, Beata
    Dudek, Magdalena
    Zborowska, Joanna
    Wajdman, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1031977.pdf
    Data publikacji:
    2016
    Wydawca:
    PPHU Projack Jacek Wąsik
    Tematy:
    Aging
    Anthropometric Indices
    BMI
    Bioelectrical Impedance Analysis
    Body Composition
    Fat Mass
    Older Women
    Opis:
    The aims of the study were to assess whether commonly used anthropometric indices are associated with body fat measures obtained by Bioel ectrical Impedance Analysis (BIA) method, and to determine the best anthropometric predictor of BIA - based body fat percentage (%Fat) and visceral fat rating (VFR) in elderly women. The sample consisted of 24 women aged 80 years and older, the residents of long - term care facilities in Upper Silesia (Poland). All women were subjected to standard anthropometric measurements including the following variables: body weight, body height, waist circumference, hip circumference and neck circumference. On the basis o f these measures Body Mass Index (BMI) as well as waist - to - hip ratio (WHR) were calculated. The subjects’ %Fat and VFR were determined by body composition analyzer TANITA BC 420MA (Japan). Pearson’s correlation coefficients were used to quantify the relati onships between variables. Stepwise multiple regression analysis with backward elimination was performed to identify possible predictors. The basic characteristics of the investigated subjects were as follows (mean±SD): age - 85.5±3.7 years; body weight - 60.4±11.6 kg; body height - 150.6±7.6 cm; BMI - 26.6±4.6 kg/m 2 ; %Fat - 31.3±9.6%; VFR - 10.7±2.5. Both of BIA - based measures significantly, positively correlated with body weight, BMI and circumferences of waist, hip and neck (r values from 0.477 to 0.835) . The multiple regression analysis for %Fat revealed that the body weight was the only variable statistically significant (r 2 =0.414; p<0.001; SEE =7.503%), and for VFR the significant β coefficients were obtained for BMI and neck circumference ( 0.625±0.133 and 0.341±0.133, respectively) ( r 2 =0.754; p<0.001; SEE =1.313). Among popular anthropometric indices of body composition in the oldest old group o f women, body weight seems to be the best predictor of body fat percentage, and VFR could be predicted by BMI along with a neck circumference.
    Źródło:
    Physical Activity Review; 2016, 4; 89-99
    2300-5076
    Pojawia się w:
    Physical Activity Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    1000 Liver Transplantations at the Department of General, Transplant and Liver Surgery, Medical University of Warsaw - Analysis of Indications and Results
    Autorzy:
    Krawczyk, Marek
    Grąt, Michał
    Barski, Krzysztof
    Ligocka, Joanna
    Antczak, Arkadiusz
    Kornasiewicz, Oskar
    Skalski, Michał
    Patkowski, Waldemar
    Nyckowski, Paweł
    Zieniewicz, Krzysztof
    Grzelak, Ireneusz
    Pawlak, Jacek
    Alsharabi, Abdulsalam
    Wróblewski, Tadeusz
    Paluszkiewicz, Rafał
    Najnigier, Bogusław
    Dudek, Krzysztof
    Remiszewski, Piotr
    Smoter, Piotr
    Grodzicki, Mariusz
    Korba, Michał
    Kotulski, Marcin
    Cieślak, Bartosz
    Kalinowski, Piotr
    Gierej, Piotr
    Frączek, Mariusz
    Rdzanek, Łukasz
    Stankiewicz, Rafał
    Kobryń, Konrad
    Nazarewski, Łukasz
    Leonowicz, Dorota
    Urban-Lechowicz, Magdalena
    Skwarek, Anna
    Giercuszkiewicz, Dorota
    Paczkowska, Agata
    Piwowarska, Jolanta
    Gelo, Remigiusz
    Andruszkiewicz, Paweł
    Brudkowska, Anna
    Andrzejewska, Renata
    Niewiński, Grzegorz
    Kilińska, Beata
    Zarzycka, Aleksandra
    Nowak, Robert
    Kosiński, Cezary
    Korta, Teresa
    Ołdakowska-Jedynak, Urszula
    Sańko-Resmer, Joanna
    Foroncewicz, Bartosz
    Ziółkowski, Jacek
    Mucha, Krzysztof
    Senatorski, Grzegorz
    Pączek, Leszek
    Habior, Andrzej
    Lechowicz, Robert
    Polański, Sławomir
    Leowska, Elżbieta
    Pacho, Ryszard
    Andrzejewska, Małgorzata
    Rowiński, Olgierd
    Kozieł, Sławomir
    Żurakowski, Jerzy
    Ziarkiewicz-Wróblewska, Bogna
    Górnicka, Barbara
    Hevelke, Piotr
    Michałowicz, Bogdan
    Karwowski, Andrzej
    Szczerbań, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1396689.pdf
    Data publikacji:
    2012-06-01
    Wydawca:
    Index Copernicus International
    Tematy:
    liver transplantation
    indications
    results
    mortality
    Opis:
    The aim of the study was to analyze indications and results of the first one thousand liver transplantations at Chair and Clinic of General, Transplantation and Liver Surgery, Medical University of Warsaw.Material and methods. Data from 1000 transplantations (944 patients) performed at Chair and Clinic of General, Transplantation and Liver Surgery between 1994 and 2011 were analyzed retrospectively. These included 943 first transplantations and 55 retransplantations and 2 re-retransplantations. Frequency of particular indications for first transplantation and retransplantations was established. Perioperative mortality was defined as death within 30 days after the transplantation. Kaplan-Meier survival analysis was used to estimate 5-year patient and graft survival.Results. The most common indications for first transplantation included: liver failure caused by hepatitis C infection (27.8%) and hepatitis B infection (18%) and alcoholic liver disease (17.7%). Early (< 6 months) and late (> 6 months) retransplantations were dominated by hepatic artery thrombosis (54.3%) and recurrence of the underlying disease (45%). Perioperative mortality rate was 8.9% for first transplantations and 34.5% for retransplantations. Five-year patient and graft survival rate was 74.3% and 71%, respectively, after first transplantations and 54.7% and 52.9%, respectively, after retransplantations.Conclusions. Development of liver transplantation program provided more than 1000 transplantations and excellent long-term results. Liver failure caused by hepatitis C and B infections remains the most common cause of liver transplantation and structure of other indications is consistent with European data.
    Źródło:
    Polish Journal of Surgery; 2012, 84, 6; 304-312
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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