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Tytuł:
Zagadnienie ścinania w żelbetowych belkach zespolonych o przekroju teowym
Shear problem of T-sectional composite reinforced concrete beams
Autorzy:
Jabłoński, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/390359.pdf
Data publikacji:
2011
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
żelbetowe belki zespolone
ścinanie
praca podporowa
przekrój teowy
composite reinforced concrete beam
shear
support running
T-sectional cross
Opis:
Artykuł przedstawia dane literaturowe dotyczące zagadnienia ścinania w belkach żelbetowych zespolonych o przekroju teowym – ich pracy w strefach przypodporowych oraz styku. Na wstępie przedstawiono gdzie w praktyce budowlanej występują elementy zespolone o przekroju teowym. Następnie przeanalizowano sposoby ustalania parametrów geometrycznych (według zaleceń normowych [12,14]) przekrojów teowych w belkach monolitycznych oraz belkach zespolonych ze stykiem nierozwarstwionym lub zarysowanym. W celu opanowania istoty zagadnienia przestudiowano literaturę [6,7,8,9] oraz normy [12,13] w zakresie ścinania w strefach przypodporowych oraz między środnikiem a półką jednorodnych przekrojów teowych. Przechodząc do rozpoznania meritum zagadnienia skoncentrowano się na: ścinaniu w styku między prefabrykatem a betonem monolitycznym, pracy stref przypodporowych zginanych belek zespolonych oraz uzupełniono wiadomości o ścinaniu w stropach gęsto żebrowych [3,5,12,14,15,16]. Na zakończenie zrelacjonowano najistotniejsze badania w aspekcie ścinania i pracy styku belek zespolonych o przekroju teowym [3,4,10,11] oraz wyprowadzono wnioski dla badań własnych.
The article presents data available in the literature concerning shear problem of composite concrete T-beams - their running in support zone and contact surface. To begin with presented where are in the civil engineering T-sectional composite elements. Following made an analysis of method for geometric buckling (according to standards [12,14]) T-sections of monolithic and composite beams without and with cracked contact surfaces. There were also literature [6,7,8,9] and standards [12,13] studies in field of support zone and between flange and web shearing solid T-beams in order to know the matter. In the essence of problem concentrated on: horizontal shearing in contact surface between precast and cast in place components, running support zone of bending composite beams and complete rib-and-slab floors’ sharing data [3,5,12,14,15,16]. At the end reported the most important researches in shearing and running contact surface of composite T-beams [3,4,10,11] also draw a conclusions to my own work.
Źródło:
Budownictwo i Architektura; 2011, 9, 2; 5-22
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Working conditions during the COVID-19 pandemic in primary and tertiary healthcare: a comparative cross-sectional study
Autorzy:
Aulanko, Ida
Sanmark, Enni
Oksanen, Lotta
Oksanen, Sampo
Lahdentausta, Laura
Kivimäki, Anne
Paju, Susanna
Pietiäinen, Milla
Pussinen, Pirkko
Geneid, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/2188906.pdf
Data publikacji:
2023
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
COVID-19
SARS-CoV-2
pandemics
health personnel
surveys and questionnaires
cross-sectional studies
Opis:
Objectives The COVID-19 pandemic has globally affected healthcare workers’ (HCWs) health and wellbeing. Most studies on COVID-19 have focused on tertiary healthcare. The aim of this study was to increase the knowledge on the effects of the pandemic on working conditions in tertiary and primary healthcare. Material and Methods The comparative cross-sectional study consisted of an online questionnaire sent to HCWs of the City of Helsinki (primary healthcare) and Helsinki University Hospital (tertiary healthcare). Altogether 1580 HCWs with direct patient contact participated in the study: 895 from tertiary and 685 from primary healthcare. Statistical analysis used SPSS 25 from IBM. The tests used were the χ² test, Fisher’s exact test, and binary logistic regression analysis. Results Primary HCWs were less likely to treat COVID-19 patients (OR = 0.45, 95% CI: 0.37–0.56). However, both groups reported a similar number of COVID-19 infections, primary HCWs 4.9% and tertiary HCWs 5.0%, and workrelated quarantine was significantly more prevalent (OR = 1.96, 95% CI: 1.38–2.79) among primary HCWs. In addition, work-related wellbeing was poorer among primary HCWs than tertiary HCWs in terms of feeling more stressed at work (OR = 3.20, 95% CI: 2.55–4.02), not recovering from work (OR = 0.49, 95% CI: 0.39–0.62), reported mental wellbeing below normal levels (OR: 1.59, 95% CI: 1.26–2.00), and increased working hours (OR = 1.63, 95% CI: 1.25–2.12). Conclusions The study demonstrates how the pandemic has affected the wellbeing and working conditions of not only tertiary but also less studied primary HCWs. Our findings suggest that the challenges identified during the COVID-19 pandemic in the health and wellbeing of healthcare workers are even greater in primary care than in tertiary care.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2023, 36, 1; 139-150
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Working conditions during the COVID-19 pandemic in primary and tertiary healthcare: a comparative cross-sectional study
Autorzy:
Aulanko, Ida
Sanmark, Enni
Oksanen, Lotta
Oksanen, Sampo
Lahdentausta, Laura
Kivimäki, Anne
Paju, Susanna
Pietiäinen, Milla
Pussinen, Pirkko
Geneid, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/2203020.pdf
Data publikacji:
2023-03-02
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
COVID-19
SARS-CoV-2
pandemics
health personnel
surveys and questionnaires
cross-sectional studies
Opis:
Objectives The COVID-19 pandemic has globally affected healthcare workers’ (HCWs) health and wellbeing. Most studies on COVID-19 have focused on tertiary healthcare. The aim of this study was to increase the knowledge on the effects of the pandemic on working conditions in tertiary and primary healthcare. Material and Methods The comparative cross-sectional study consisted of an online questionnaire sent to HCWs of the City of Helsinki (primary healthcare) and Helsinki University Hospital (tertiary healthcare). Altogether 1580 HCWs with direct patient contact participated in the study: 895 from tertiary and 685 from primary healthcare. Statistical analysis used SPSS 25 from IBM. The tests used were the χ² test, Fisher’s exact test, and binary logistic regression analysis. Results Primary HCWs were less likely to treat COVID-19 patients (OR = 0.45, 95% CI: 0.37–0.56). However, both groups reported a similar number of COVID-19 infections, primary HCWs 4.9% and tertiary HCWs 5.0%, and workrelated quarantine was significantly more prevalent (OR = 1.96, 95% CI: 1.38–2.79) among primary HCWs. In addition, work-related wellbeing was poorer among primary HCWs than tertiary HCWs in terms of feeling more stressed at work (OR = 3.20, 95% CI: 2.55–4.02), not recovering from work (OR = 0.49, 95% CI: 0.39–0.62), reported mental wellbeing below normal levels (OR: 1.59, 95% CI: 1.26–2.00), and increased working hours (OR = 1.63, 95% CI: 1.25–2.12). Conclusions The study demonstrates how the pandemic has affected the wellbeing and working conditions of not only tertiary but also less studied primary HCWs. The authors’ findings suggest that the challenges identified during the COVID-19 pandemic in the health and wellbeing of healthcare workers are even greater in primary care than in tertiary care. Int J Occup Med Environ Health. 2023;36(1):139–50
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2023, 36, 1; 139-150
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Work Ability of Workers in Different Age Groups in a Public Health Institution in Brazil
Autorzy:
Monteiro, M. S.
Ilmarinen, J.
Filho, H. R. C.
Powiązania:
https://bibliotekanauki.pl/articles/89793.pdf
Data publikacji:
2006
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
aging workers
work ability index
cross-sectional study
zdolność do pracy
Brazylia
starsi pracownicy
Opis:
Objectives. The aim of this study was to determine the associations between demographics, work, lifestyle, housework, and the work ability of workers. Methods. Employees between the ages of 20 and 69 (N = 651), employed at a Brazilian public institution, responded to a questionnaire on demographics, work, lifestyle characteristics, and work ability. Results. Work ability decreased significantly with age among the women. The younger group had higher scores on the work ability index than the older age groups, except for mental resources. The logistic regression analysis showed that higher age, lower education, and long work history at the institution were significantly associated with reduced work ability. Conclusions. The progressive aging, the low level of education, and the long duration work in the studied institution were related to a reduction in work ability, which increases the risk of work disability or early retirement.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2006, 12, 4; 417-427
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Work ability of aging teachers in Bulgaria
Autorzy:
Vangelova, Katya
Dimitrova, Irina
Tzenova, Bistra
Powiązania:
https://bibliotekanauki.pl/articles/2162012.pdf
Data publikacji:
2018-10-23
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
ageing
teachers
work ability index
work ability
cross-sectional study
adverse health effects
Opis:
Objectives The work ability of aging teachers is of special interest because of high risk of stress. The aim of the study was to follow the work ability of aging teachers and compare it with that of aging non-teacher professionals. Material and Methods The study included 424 teachers of age ≤ 44 years old (N = 140) and ≥ 45 years old (N = 284), with about 10% male teachers in both age groups, matched by sex and age with non-teacher professionals. Work ability was assessed by means of the Work Ability Index (WAI). Chi2 tests and regression analyses were used for studying WAI scales ratings, diagnosed by physician diseases and WAI ratings. Results Our data shows comparatively high work ability for both age groups of teachers but WAI of aging teachers was significantly lower in comparison to their younger colleagues as well as aging non-teacher professionals. About 80% of aging groups reported diseases diagnosed by physicians. Cardiovascular, musculoskeletal and respiratory diseases were the most frequently reported by aging teachers, while teachers ≤ 44 years old reported respiratory, cardiovascular, neurological and sensory diseases. With aging significantly higher rates of arterial hypertension, diabetes, injury to hearing and mental disorders were reported by teachers as compared to aging non-teacher professionals. The rates of reported repeated infections of respiratory tracts were high in both age groups of teachers, especially in the group of aging teachers. The estimated work ability impairment due to the disease showed the significant effect of aging for teachers as well as the significant difference when comparing aging teachers and non-teacher professionals. Conclusions Our data shows high work ability for both age groups of teachers but significantly lower for aging teachers accompanied with higher rates of psychosomatic diseases, including hearing impairment and respiratory diseases. Preservation of teacher health could contribute to maintenance of their work ability and retention in the labor market. Int J Occup Med Environ Health 2018;31(5):593–602
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2018, 31, 5; 593-602
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Work Ability and Musculoskeletal Disorders Among Workers From a Public Health Institution
Autorzy:
Monteiro, M. S.
Alexandre, N. M. C.
Ilmarinen, J.
Rodrigues, C. M.
Powiązania:
https://bibliotekanauki.pl/articles/89943.pdf
Data publikacji:
2009
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
work-related musculoskeletal disorders (WMDs)
work ability
work ability index
cross-sectional studies
Opis:
Objective. The study investigated the associations between diagnosed musculoskeletal disorders (MSD), work ability and demographics, work and lifestyle characteristics in a public health institution with a variety of occupations. Methods. A cross-sectional study was carried out in a public health institution in Brazil. The subjects (n = 168) aged 20–69 answered a questionnaire on demographics, work, lifestyle characteristics and the work ability index. Results. A univariate regression analysis was carried out with the presence of MSD as a dependent variable. Association was found in relation to the age group, type of work demand, tenure at the institution, body mass index, work in the nutrition and laundry sectors, being a maid in the previous job, auxiliary service and auxiliary maintenance occupations, work ability in relation to physical and mental demands, estimated work impairment due to diseases, sick leave in the past year, own prognosis of work ability in 2 years’ time and mental resources: enjoying daily activities, being active and alert, being full of hope for the future. Conclusion. The presence of MSD affected several aspects of work ability.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2009, 15, 3; 319-324
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of cognitive schemata in the development of posttraumatic stress disorder: results of cross-sectional and longitudinal studies
Autorzy:
Dudek, Bohdan
Szymczak, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/2185476.pdf
Data publikacji:
2011-03-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
cross-sectional study
longitudinal study
SOC
PTSD
firefighters
police officers
Opis:
Objective: There are two theories (by Horowitz and by Foa) which attempt at explaining the process of posttraumatic stress disorder (PTSD) development by information dissonance. The purpose of the present study was to verify these theories via cross-sectional and longitudinal studies. Materials and Methods: The study based on a cross-sectional design was performed on a representative group of Polish firefighters. The study using a longitudinal protocol was conducted among police officers. The level of PTSD was assessed using the Questionnaire for PTSD Measurement (K-PTSD). The sense of coherence (SOC) was measured with the Polish adaptation of the Orientation to Life Questionnaire by A. Antonovsky. Results: In the cross-sectional study, the correlation coefficients between K-PTSD and SOC were –0.35 (p < 0.001) in the group of firefighters and –0.47 (p < 0.001) in that of police officers. In the longitudinal study, the relationship between SOC and PTSD symptoms appeared to be curvilinear and had the U-letter shape. Therefore, we used ANOVA for statistical analysis. Unfortunately, the F(2.31) = 1.900 and p > 0.05 indicated that the tendency we observed was not statistically significant. Conclusions: We would like to propose two possible explanations for the difference in the relationships between SOC and PTSD symptoms obtained in the studies employing the cross-sectional and the longitudinal protocols.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2011, 24, 1; 29-35
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Importance of Internet And Online Social Networks in the Spanish Hotel Sector
Autorzy:
Infante-Moro, A.
Infante-Moro, J-C.
Martínez-López, F-J.
García-Ordaz, M.
Powiązania:
https://bibliotekanauki.pl/articles/118135.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
hotels
online social networks
internet
e-commerce
cross-sectional study
Opis:
This paper is a cross-sectional study on the use of Internet and Online Social Networks in the Spanish hotel sector compared to Spanish companies in other sectors. The conclusions from this extensive survey are that the use of online social networks is more important and is more developed in the hotel sector than in Spanish companies in general. However, although it gives considerable importance to online social networks, the hotel sector needs to revise its rules of usage. The use of new tools such as e-commerce to sell the hotel stays must increase, and marketing efforts should be geared more towards online social networks because the hotel sector is currently losing ground in a market that generates more and more potential clients and sales by the day.
Źródło:
Applied Computer Science; 2016, 12, 1; 75-86
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Styl życia studentów Śląskiego Uniwersytetu Medycznego w Katowicach w latach 2005 i 2020
Lifestyle of students of Medical University of Silesia, Katowice, Poland, in years 2005 and 2020
Autorzy:
Klocek, Tomasz S.
Witek, Przemysław
Wawrzonkowski, Patryk
Binek, Aleksandra
Woźniak, Nadia
Krzych, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/2130430.pdf
Data publikacji:
2022-10-18
Wydawca:
Śląski Uniwersytet Medyczny w Katowicach
Tematy:
styl życia
kwestionariusz
studenci medycyny
badanie przekrojowe
lifestyle
questionnaire
medical students
cross-sectional study
Opis:
WSTĘP: Styl życia jest szerokim pojęciem i ma duży wpływ na zdrowie. Zmienia się na przestrzeni czasu pod wpływem doniesień naukowych, trendów społecznych i indywidualnych uwarunkowań. Celem pracy było międzypokoleniowe porównanie stylu życia studentów Śląskiego Uniwersytetu Medycznego w Katowicach (SUM). MATERIAŁ I METODY: Badanie przekrojowe przeprowadzono z wykorzystaniem autorskiego kwestionariusza. W badaniu uczestniczyły dwie grupy liczące po 221 osób, studenci kierunków medycznych w latach 2003–2005 i w roku 2020. Do oceny stylu życia użyto rekomendacji Światowej Organizacji Zdrowia, a zmienne zaklasyfikowano jako ,,zdrowy nawyk” lub ,,niezdrowy nawyk”. WYNIKI: Studenci w roku 2020 wykazywali ,,zdrowsze” zachowania w porównaniu ze studentami z lat 2003–2005, jeśli chodzi o regularność spożywania posiłków (p = 0,02), rzadsze spożycie posiłków z dużą zawartością soli kuchennej (p = 0,03), częstsze spożycie warzyw i owoców (p < 0,01) oraz dłuższy sen (p < 0,01); zwiększyły się natomiast używanie kofeiny (p = 0,02), częstość spożywania napojów alkoholowych (p = 0,04) oraz liczba osób odczuwających stres (p < 0,01), który dla większości był destabilizujący (p < 0,01). WNIOSKI: Styl życia studentów kierunków medycznych na przestrzeni 15 lat poprawił się w zakresie nawyków żywieniowych. Zmiany niekorzystne dotyczą spożycia alkoholu i odczuwania stresu.
INTRODUCTION: Lifestyle is a broad concept with a large impact on health. It changes over time under the influence of scientific reports, social trends and individual conditions. The aim of this study was to make an intergenerational comparison of the lifestyle of students of the Medical University of Silesia, Katowice, Poland. MATERIAL AND METHODS: A cross-sectional study was conducted using the author’s own questionnaire. Two groups of 221 subjects each, medical students in 2003–2005 and 2020, participated in the study. Recommendations of the World Health Organization were used to assess lifestyle and the variables were classified as “healthy” or “unhealthy”. RESULTS: The students in 2020 exhibited “healthier” behaviors compared to the students in 2003–2005 in terms of the regularity of meals (p = 0.02), less frequent consumption of meals with a high salt content (p = 0.03), more frequent consumption of fruits and vegetables (p < 0.01) and longer sleep periods (p < 0.01). In contrast, caffeine use (p = 0.02), the frequency of alcoholic beverage consumption (p = 0.04) and the number of people experiencing stress (p < 0.01), which was destabilizing for most (p < 0.01), increased. CONCLUSIONS: The lifestyle of medical students improved over 15 years in terms of eating habits. Unfavorable changes are related to alcohol consumption and perceived stress.
Źródło:
Annales Academiae Medicae Silesiensis; 2022, 76; 112-117
1734-025X
Pojawia się w:
Annales Academiae Medicae Silesiensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sposoby określania miąższości kłód brzozy brodawkowatej (Betula pendula Roth)
Methods for determining the volume of silver birch (Betula pendula Roth) logs
Autorzy:
Bruchwald, A.
Dmyterko, E.
Witkowska, J.
Jodłowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/986659.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
brzoza brodawkowata
Betula pendula
klody odziomkowe
klody srodkowe
miazszosc klod
metody obliczen
log volume
two−sectional equations
middle cross section equations
empirical equations
Opis:
The purpose of the research was to develop and evaluate the accuracy of various methods for determining the volume of the butt−end (from 0 to 6 m) and middle (from 6 to 12 m) logs of silver birch. The material was collected on 84 samples plots established throughout Poland. On each plot, 2 to 10 trees (722 in total) were felled and measured using a cross−section method. The average age of the measured trees ranged from 22 to 97 years, the average diameter at the breast height from 7.0 to 39.6 cm, and the average height from 8.1 to 31.2 m. We tested 4 methods for log volume determination. Two can be used for individual logs and two for stacks. In method 1 one measures the log length and diameter under bark at a distance of 1 meter from the butt−end and at half the length of the remaining part of the log. The log volume is defined by a two−sectional formula based on the middle cross−section (eq. 1). The average error for that method is close to zero, regardless the log length (tab.). In method 2, two−sectional formula of the middle cross−section was used with the diameter in the middle of each section calculated from the developed regression models based on the log length and diameter under bark at the top end. For both logs the error of volume calculation is small, especially for the middle one (tab.). Method 3 defines the log volume using the middle cross−section formula, which requires log length and diameter at half of the length. For the butt−end log, the volume has a systematic negative error, exceeding –5%. For the middle log, the formula is characterized by high accuracy. Method 4 is also based on the middle cross−section formula, but the diameter up to half the length is calculated from empirical formulas based on the log length and diameter under bark at the top end (eq. 5c and 6c). The accuracy of this method is close to the accuracy of method 3 (tab.). To determine the log volume in inaccessible places, method 2 can be recommended. The corresponding diameter is calculated from the regression equations. This method can also be used when the measurement places are accessible, which unifies the birch log measurement methods. However, determination of birch logs volume based on the commonly used middle cross−section formula should not be applied as for the butt−end log this method produces too large negative error, additionally increased by the rounding down the diameter measurement.
Źródło:
Sylwan; 2018, 162, 06; 443-451
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatio‑Temporal Analysis of the Impact of Credit Rating Agency Announcements on the Government Bond Yield in the World in the Period of 2008–2017
Przestrzenno‑czasowa analiza wpływu ogłoszeń agencji ratingowych na rentowność obligacji skarbowych na świecie w latach 2008–2017
Autorzy:
Szulc, Elżbieta
Wleklińska, Dagna
Powiązania:
https://bibliotekanauki.pl/articles/655017.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
obligacje skarbowe
rating obligacji
rentowność obligacji
modele przestrzenne dla połączonych danych przekrojowo‑czasowych
dynamiczne przestrzenne modele panelowe
government bonds
bond rating
bond yield
dynamic spatial models for pooled time series and cross‑sectional data
dynamic spatial panel data models
Opis:
Artykuł dotyczy wpływu ogłoszeń publikowanych przez agencje ratingowe na rentowność obligacji skarbowych wybranych krajów świata. Oceny przyznawane dłużnym papierom wartościowym ze względu na standing finansowy emitenta stanowią ważną determinantę ich rentowności. Wśród czynników wpływających na stopę zwrotu danego instrumentu dłużnego, oprócz czynników idiosynkratycznych, czyli związanych z gospodarką emitenta, oraz globalnych, wymienia się także oceny ratingowe krajów powiązanych. Badania empiryczne przeprowadzone w tym zakresie dowodzą ponadto, że relacja ta ma charakter asymetryczny. Pozwala to przypuszczać, że korzystne informacje dotyczące poprawy ratingów obligacji skarbowych nie znajdują odzwierciedlenia w spadku ich rentowności. Celem artykułu jest analiza interakcji między rentownością dziesięcioletnich obligacji skarbowych emitowanych przez wybrane gospodarki. Przedmiotem szczególnego zainteresowania jest ocena wpływu pozytywnych i negatywnych zmian ratingów, dokonywanych przez międzynarodowe agencje, na rentowność obligacji emitowanych przez inne gospodarki niż kraj, do którego odnosi się ocena. Zakres analizy dotyczy dziesięcioletnich obligacji skarbowych emitowanych przez czterdzieści krajów w latach 2008-2017. W pracy wykorzystano przestrzenne modele dla połączonych danych przekrojowych i szeregów czasowych, w tym dynamiczne przestrzenne modele panelowe.
The paper concerns the impact of announcements published by rating agencies on the government bond yield in selected countries of the world. Ratings assigned to debt securities on account of the issuer’s financial standing are an important determinant of their yield. Factors that affect the rate of return of a given traded debt, in addition to idiosyncratic factors, i.e. those related to the issuer’s economy, and global factors, also include the ratings of connected countries. Moreover, empirical studies carried out in this area prove that the relationship is asymmetrical. This allows us to suppose that favourable information concerning the improvement of government bond ratings is not reflected in the decrease in their yield. The aim of the paper is the analysis of interactions between the yields of 10‑year government bonds issued by selected economies. A subject that is of particular interest is the evaluation of the impact of positive and negative changes in credit rating assessments made by international agencies on the yield of bonds issued by other economies than the country concerned in the assessment. The spatial scope of the analysis concerns 10‑year government bonds issued by 40 countries in the period of 2008-2017. In the study, dynamic spatial models for pooled time series and cross‑sectional data and dynamic spatial panel data models were used.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2019, 3, 342; 133-150
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial, functional and comparative analysis of a Late Palaeolithic Swiderian culture settlement at Kraków-Bieżanów site 15
Przestrzenna, funkcjonalna i porównawcza analiza obozowiska kultury świderskiej z Krakowa Bieżanowa stanowisko 15
Autorzy:
Pyżewicz, Katarzyna
Serwatka, Kamil
Stefański, Damian
Powiązania:
https://bibliotekanauki.pl/articles/584876.pdf
Data publikacji:
2017
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
Paleolit schyłkowy
kultura świderska
analiza geometryczno-mrfometryczna kształtu
analiza traseologiczna
analiza przekroju poprzecznego
Late Palaeolithic
Swiderian culture
Swiderian point
use-wear analysis
tip cross-sectional area analysis
tip angle analysis
geometric-morphometric outline shape analysis
Opis:
Niniejszy artykuł jest studium poświęconym organizacji przestrzennej osadnictwa kultury świderskiej na stanowisku w Krakowie-Bieżanowie 15. W trakcie szerokopłaszczyznowych badań ratowniczych (2004-2008), pozyskano tam liczne materiały krzemienne wiązane z tą kulturą. Pochodzą one zarówno z obiektów, jak np. niewielkiej krzemienicy (KB-15/1 – obiekt 1), czy skupiska materiału (obiekt 2 i 3), jak również ze znacznej części przebadanej partii stanowiska, gdzie zostały podjęte jako znaleziska pojedyncze. Analiza planigraficzna podstawowych grup narzędziowych, tj. liściaków (ostrzy) świderskich, drapaczy i rylców, pokazała, że ich rozrzut wokół obiektów archeologicznych nie jest przypadkowy i wskazuje on na zróżnicowanie w zakresie funkcjonalnej organizacji przestrzeni przez ludność kultury świderskiej na stanowisku. Niniejsze badanie miało odpowiedzieć na pytanie dotyczące właściwości tego zróżnicowania. W tym celu przebadano mikroskopowo część dostępnego materiału. Chociaż stan zachowania zabytków mocno ograniczył możliwość przeprowadzenie analizy traseologicznej, to poczyniono szereg cennych obserwacji. Szczególnie interesujące wnioski dotyczyły liściaków i drapaczy. Dodatkowo, liściaki świderskie, jako miarodajna kategoria zabytków związanych z kulturą świderską, zostały przeanalizowane przez zastosowanie metod morfometrycznych (analiza przekroju poprzecznego ostrza, analiza kąta ostrza, morfometria geometryczna kształtu liściaków), a płynące z nich wnioski uzupełniły badania traseologiczne. Uzyskane wyniki pozwoliły na wskazanie wyróżniających się obszarów (strefy liściaków, drapaczy i rylców) oraz ich interpretację funkcjonalną.
This article is a study devoted to the spatial organization of a settlement of the Swiderian culture at Kraków-Bieżanów site 15. In the course of wide-scale rescue excavations (1999-2008), numerous lithic materials associated with this culture were discovered. They come from archaeological features such as the small kshemenitsa (KB-15/1 – feature 1) or spots of material clustering (features 2 and 3), they were collected as single finds. The spatialanalysis of the basic tool groups, i.e. Swiderian points, endscrapers and burins, showed that their distribution around archaeological objects wasnot accidental and points to diversity in functional space organization at the site. The aim of this investigation was to find the reason for the nature of this differentiation. For this purpose, a part of the available material has been studied by means of use-wear analysis. Although the state of preservation of lithics greatly reduced the possibility of carrying out functional analysis, a number of valuable observations were made. Particularly interesting were results concerning Swiderian points and endscrapers. In addition, Swiderian points, as the most intriguing category of typological tool related to the Swiderian culture, were analyzed by morphometric methods (tip cross-sectional area analysis, tip angle analysis, geometrics morphometrics) which were subjected to corroborated use-wear studies. The results obtained indicated the distictive areas (points, endscrapers and burins zones) and shed light on their functional interpretation.
Źródło:
Acta Archaeologica Lodziensia; 2017, 63; 7-27
0065-0986
2451-0300
Pojawia się w:
Acta Archaeologica Lodziensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sleep duration and metabolic syndrome
Autorzy:
Kawada, Tomoyuki
Powiązania:
https://bibliotekanauki.pl/articles/2168365.pdf
Data publikacji:
2016-11-18
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
short sleep duration
long sleep duration
metabolic syndrome
cross-sectional study
sex difference
causality
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2016, 29, 6; 877-878
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality of life in parents of children and adolescents after systemic sting reactions
Autorzy:
Cichocka-Jarosz, E.
Brzyski, P.
Tarczoń, I.
Jedynak-Wąsowicz, U.
Tomasik, T.
Lis, G.
Powiązania:
https://bibliotekanauki.pl/articles/2083218.pdf
Data publikacji:
2019
Wydawca:
Instytut Medycyny Wsi
Tematy:
quality of life
parents
insect sting
Hymenoptera venom allergy
cross-sectional study
Opis:
Introduction and objectives. The study aimed at evaluating the impact of Hymenoptera venom allergy (HVA) in children and adolescents, on their parents’ QoL, taking into account their socio-demographic characteristics. Materials and method. The study sample consisted of 101 parents of children and adolescents aged 9–17 years, with a history of systemic reaction after insect sting who were referred for consultations in the tertiary level allergology department. The mean age of the parents was 39 years (SD=8.1; range 25–65 years); the majority were mothers (68%) and rural inhabitants (62%). QoL in parents of HVA children and adolescents was measured with the Parents of Children with Hymenoptera Venom Allergy Quality of Life Scale, a questionnaire covering 5 dimensions: anxiety, caution, limitations and discomfort, support provided to the child and feeling of safety, each measured on the scale ranging from 1 to 5. Independent predictors of QoL were estimated using the Generalized Linear Model. Results. Parents of urban children and adolescents treated with venom immunotherapy (VIT) up to 3 years (B=-1.37, 95CI= (-2.22;-0.53); p=0.001) and of rural children treated for more than 3 years (B=-0.94, 95CI=(-1.55;-0.33); p=0.003) reported lower anxiety than parents studied at diagnosis. In urban parents, individuals studied at VIT beginning reported a lower feeling of safety (B=-0.63, 95CI=(-1.11;-0.15); p=0.010); those studied up to 3 years of treatment reported a higher feeling of safety (B=0.64, 95CI=(0.11;1.16); p=0.018) than those studied at diagnosis. Contrariwise, in rural parents, those studied at the beginning of immunotherapy reported a higher feeling of safety than those studied at diagnosis (B=0.51, 95CI=(0.13;0.88); p=0.008). Conclusions. The longest VIT duration in children and adolescents with HVA is related to the decreased anxiety of their parents. Parent’s feeling of safety depends on the stage of treatment and place of residence.
Źródło:
Annals of Agricultural and Environmental Medicine; 2019, 26, 2; 315-321
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przyczynek do oceny stanu zarysowania belek z betonu zbrojonego prętami BFRP
On assessment of cracking of concrete beams reinforced with BFRP bars
Autorzy:
Urbański, M.
Łapko, A.
Powiązania:
https://bibliotekanauki.pl/articles/390578.pdf
Data publikacji:
2014
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
BFRP
sztywność na zginanie
beton
pręt BFRP
zarysowanie
cross-sectional stiffness
concrete
basalt bars
cracking behavior
Opis:
W pracy przedstawiono analizę porównawczą doświadczalnych i obliczonych teoretycznie szerokości rys w jednoprzęsłowych belkach swobodnie podpartych zbrojonych prętami bazaltowymi BFRP (Basalt Fibre Reinforced Polymers). Belki typu BFRP wykonano z betonu C30/37 ze zbrojeniem dolnym na zginanie prętami bazaltowymi o średnicy 8 mm, dodatkowo wykonano belki referencyjne ze zbrojeniem stalowym tej samej średnicy. Badano ugięcia i zarysowania oraz nośność belek zbrojonych prętami BFRP, o cechach wytrzymałościowych określonych w testach na rozciąganie. Wykazano, że znacznie zredukowana sztywność elementów zbrojonych prętami bazaltowymi BFRP wywołuje kilkakrotnie większe szerokości rys w porównaniu z belkami zbrojonymi prętami stalowymi o tym samym przekroju poprzecznym.
This paper presents a comparative analysis of experimental and theoretical crack widths of simply supported beams reinforced with BFRP rebar (Basalt Fiber Reinforced Polymers). The tested BFRC model beams have been made of concrete class C30/37 and of bottom flexural basalt bars 8 mm in diameter. The reference RC beams with traditional flexural steel reinforcement have been additionally made of the same diameter. Beam deflections, concrete crack widths and strength capacity of beams reinforced with BFRP bars as well as with traditional steel bars have been registered. It has been shown that crack widths of beams reinforced with BFRP bars have been much (three to four times) higher than in the beams reinforced traditionally
Źródło:
Budownictwo i Architektura; 2014, 13, 3; 201-208
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 44

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