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Wyświetlanie 1-15 z 23
Tytuł:
Anomalie platynowców w historii Ziemi
PGE anomalies in Earths history
Autorzy:
Wieczorek, Anna
Brachaniec, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1033071.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
PGE
anomaly
geology
impact
platinum-group elements
Opis:
The platinum-group elements comprise a very small percentage of elements in the earth’s crust. The primary sources of them are meteorite impacts and volcanism. The study of PGEs anomaly in sediment profiles as a possible indicator of impact began in 1980, when was suggested a link between high levels of iridium and the mass extinction event in Late Cretaceous.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2016, 7; 177-181
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of haemodynamic effects of noninvasive ventilation delivered via ResQGARD and CPAP boussignac masks
Autorzy:
Gaszyńska, Ewelina
Roguszka, Krzysztof
Stankiewicz- Rudnicki, Michał
Wieczorek, Andrzej
Gaszyński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1396097.pdf
Data publikacji:
2013-03-01
Wydawca:
Index Copernicus International
Tematy:
mechanical ventilation
haemodynamic CPAP
Impedance Threshold Device
Opis:
Noninvasive ventilation (NIV) is a technique of mechanical ventilation which does not require invasive airway management, i.e. intubation or tracheostomy. In emergency medicine Continuous Positive Airway Pressure (CPAP) is used often. A new method of NIV is Impedance Threshold Device (ITD). Breathing through an ITD is utilized to raise blood pressure in hypotensive patients. Aim of the study was to compare haemodynamic effects of NIV ITD and NIV CPAP. Material and methods. This study involved a group of 25 healthy volunteers. NIV was performed using ResQGARD ITD and CPAP Boussignac. Ventilation time was 25 minutes for each mask in each participant. Every three minutes parameters were collected: SpO2, BP and HR. There was a one hour interval in between ventilation with each mask. CPAP pressure was set at a level of 8 cm H2O and the mean inspiratory resistance of the ITD was 7cm H2O. Collected parameters were subjected to ANOVA statistical analysis. Results. Absolute comparison of BP, HR and SpO2 values did not reveal statistically significant differences between the masks. However considering blood pressure levels at entry, ventilation through an ITD significantly raised BP. Ventilation with NIV CPAP did not change significantly BP. Conclusion. Ventilation through an ITD device significantly improve haemodynamic function, whereas CPAP ventilation had no significant effect on it.
Źródło:
Polish Journal of Surgery; 2013, 85, 3; 129-132
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Microaspiration Around Taperguard Tube Cuffs and Standard Tracheal Tubes in Obese Patients Subjected to Surgery Under General Anesthesia
Autorzy:
Gaszyńska, Ewelina
Ratajczyk, Paweł
Wieczorek, Andrzej
Szewczyk, Tomasz
Gaszyński, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1395728.pdf
Data publikacji:
2014-03-01
Wydawca:
Index Copernicus International
Tematy:
endotracheal intubation
general anesthesia
tracheal tubes
cuff tightness
microaspirations
ventilator-associated pneumonia
Opis:
Tracheal secretion leakage might lead to ventilator-associated pneumonia. Standard tracheal tube cuffs are cylindrical in shape. Bronchial tree aspiration is observed in the presence of leakage past tracheal tube cuffs. The new TaperGuard tracheal tube has a cuff in the shape of a cone, preventing from the development of microtubules and microaspiration. The aim of the study was to compare standard tracheal tube cuffs with TaperGuard tubes, in terms of protection from microaspiration under general anesthesia. Material and methods. The observational study evaluated incidents of leakage during general anesthesia with intubation and mechanical ventilation in patients with significant obesity. The study group comprised 20 patients with the BMI >40 kg/m2 subjected to elective surgery under general anesthesia with intubation and mechanical ventilation, randomly divided into two subgroups: standard tracheal tube and TaperGuard tube. Results. In 4 of 10 patients with standard tracheal tubes we observed leakage around the cuff. In case of TaperGuard tubes no such leakage was observed. Conclusion. TaperGuard tubes protect against microaspirations, while standard tracheal tubes have no such properties.
Źródło:
Polish Journal of Surgery; 2014, 86, 3; 107-110
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of calcinated halloysite on structure and properties of rigid poly(vinyl chloride) composites
Autorzy:
Wieczorek, Martina
Tomaszewska, Jolanta
Bajda, Tomasz
Długosz, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2202880.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
polymer composites
mechanical properties
thermal properties
halloysite
poly(vinyl chloride)
kompozyty polimerowe
właściwości mechaniczne
właściwości termiczne
haloizyt
chlorek winylu
Opis:
Halloysite is a filler which may be used to produce composites with thermoplastic polymer matrix. This work summarized the results of investigations of processing, structural, mechanical, and thermal properties of the composites with poly(vinyl chloride) (PVC) matrix and raw halloysite (HA) as well as its calcined product (KHA). The effectiveness of calcination was confirmed with X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and nitrogen adsorption method. The PVC composites with HA as well as KHA were processed in the molten state in the Brabender mixer chamber. The reduction of gelation time and simultaneous increase in maximum torque with filler content were found based on the results of plastographometric analysis. SEM images of PVC/halloysite composites showed a homogeneous distribution of the filler in the polymer matrix. The introduction of halloysite leads to a slight increase in Young’s modulus and tensile strength compared to neat PVC, where the increase of both parameters is greater when KHA is used. The incorporation of 1% KHA led to an increase in impact strength, an effect which may be attributed to toughening of the polymer. A slight improvement of the Vicat softening temperature of 2.7 degrees C for PVC/HA and heat deflection temperature of 2.4 C for PVC/KHA was also ascertained for PVC modified with 10 wt% of filler.
Źródło:
Chemical and Process Engineering; 2022, 43, 3; 383--404
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excavations in the northern and eastern parts of the Byzantine town at Marea
Autorzy:
Derda, Tomasz
Gwiazda, Mariusz
Barański, Tomasz
Pawlikowska-Gwiazda, Aleksandra
Wieczorek, Dawid F.
Powiązania:
https://bibliotekanauki.pl/articles/1632544.pdf
Data publikacji:
2020-12-19
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
Egypt
Roman | Byzantine | early Islamic
architecture
amphorae
terracotta figurine
Opis:
The ‘Marea’ project of the University of Warsaw expanded the program to survey and excavation in the northern and eastern parts of the city in order to establish the character and chronology of the structures there. The eastern waterfront was uncovered, along with the adjacent latrines, streets and buildings which are presumed to be residential. The structures which were examined were very regularly formed and involved large-scale earthworks. They were built no earlier than the mid-6th century AD, and, although their purpose sometimes changed, they remained in use until about the mid-8th century AD. Accumulations of Roman, Byzantine and early Islamic date were discovered, including the oldest remains this season, that is, a row of locally-manufactured amphorae serving an unexplained purpose.
Źródło:
Polish Archaeology in the Mediterranean; 2020, 29(2); 551-575
1234-5415
Pojawia się w:
Polish Archaeology in the Mediterranean
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of Partial Discharges in Cable Insulation and Cable Head Using Acoustic Method
Autorzy:
Ranachowski, Zbigniew
Wieczorek, Krzysztof
Ranachowski, Przemysław
Dębowski, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2141672.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
partial discharges
medium voltage insulation
acoustic emission
Opis:
The article presents the application of Acoustic Emission (AE) method for detection and registration of partial discharges (PD) generated in medium voltage (MV) cable isolation and MV cable head. The insulation of the high voltage cable is made of a flexible material whose properties are characterised by a high coefficient of attenuation of the acoustic signals. For this reason, the AE method has not been used so far to detect PD in energetic cables. The subjects of the research were the MV cable and the standard T-type cable head. The cable contained defects which were the source of partial discharges. In case of cable head the PD were provoked by thin grounded electrode which was introduced into connector opening. The results of AE measurements are presented in the form of spectrograms. Acoustic Emission was evoked when the applied voltage level reached the value of 7.5 kV for the cable and 4 kV for the cable head. The authors used the acoustic instrumentation of their own design intended for future field use. Obtaining successful results of partial discharges measurements using the acoustic method in the cable insulation makes an original contribution of the presented work.
Źródło:
Archives of Acoustics; 2022, 47, 2; 259-265
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Możliwy wpływ materii pozaziemskiej na bioróżnorodność ordowickich szkarłupni – dane wstępne
The possible influence of extraterrestrial matter on Ordovician echinoderm biodiversity – preliminary data
Autorzy:
Brachaniec, Tomasz
Salamon, Mariusz A.
Karwowski, Łukasz
Wieczorek, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1033043.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
Ordovician
Polska
crinoids
echinodermata
fossil meteorite
Opis:
The Ordovician was a period with large meteorite showers, what was confirmed by fossil chondrite finds in Swedish limestones. In Bukówka section near Kielce deposits of the same age are exposed. During field works was noticed that echinoderms do not occur in three samples. It was proved that echinoderms were very sensitive to environmental changes and their disappearance was associated with a meteorite falls.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2016, 7; 13-16
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Test Rig for Measuring the Friction Torque of Gearboxes in Extreme Thermal Conditions
Nowe stanowisko badawcze do pomiaru oporów ruchu przekładni zębatych w ekstremalnych warunkach termicznych
Autorzy:
Tuszyński, Waldemar
Szczerek, Marian
Wulczyński, Jan
Gospodarczyk, Andrzej
Michalczewski, Remigiusz
Samborski, Tomasz
Gibała, Michał
Wieczorek, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2055627.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
toothed gear
gearbox
friction torque
test rig
extreme thermal conditions
przekładnia zębata
moment rozruchu
moment oporów ruchu
stanowisko badawcze
Opis:
A new test rig for tribological tests was developed and manufactured. It consists of a mobile device for measurement of the start-up friction torque of transmissions, in particular planetary gearboxes, and the friction torque in dynamically steady conditions, as well as a climatic chamber to stabilize the temperature of the tested gearbox in its extreme range: from -50 to +50°C. In the series of devices for tribological tests, developed and manufactured at the Institute, the new test rig is marked with the symbol T-34. The verification results correspond with the churning losses related to the viscosity characteristics of the lubricating oils. As the temperature increases, both the start-up friction torque and the friction torque under dynamically steady conditions decrease.
Przedstawiono nowe stanowisko do badań tribologicznych. Składa się ono z mobilnego urządzenia do badania momentu rozruchowego przekładni zębatych, w szczególności planetarnych, oraz momentu tarcia w warunkach dynamicznie ustalonych, a także z komory klimatycznej do stabilizowania temperatury badanej przekładni w skrajnym jej zakresie: od -50 do +50°C. W typoszeregu urządzeń do badań tribologicznych, opracowanych i wytwarzanych w Instytucie, nowe stanowisko posiada symbol T-34. W ramach weryfikacji działania nowego stanowiska uzyskano wyniki badań momentu tarcia przekładni planetarnych, odpowiadające charakterystyce lepkościowej oleju smarowego. W miarę wzrostu temperatury zarówno moment rozruchowy, jak i moment tarcia w warunkach dynamicznie ustalonych spadają.
Źródło:
Tribologia; 2021, 296, 2; 57--64
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parasomnias and obstructive sleep apnea syndrome: in search for a parasomnia evaluating tool appropriate for OSAS screening
Autorzy:
Wieczorek, Tomasz
Lorenc, Maciej
Martynowicz, Helena
Piotrowski, Patryk
Mazur, Grzegorz
Rymaszewska, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/551574.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
parasomnias
sleep apnea syndromes
sleep apnea
obstructive.
Źródło:
Family Medicine & Primary Care Review; 2018, 2; 176-181
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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