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Wyświetlanie 1-15 z 21
Tytuł:
Zniszczenie słupów elektroenergetycznych jako jedna z przyczyn blackoutu szczecińskiego 2008
Autorzy:
Paczkowska, T.
Paczkowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/162043.pdf
Data publikacji:
2010
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
katastrofa energetyczna
słup elektroenergetyczny
awaria mechaniczna
mechanizm zniszczenia
energetic catastrophe
overhead transmission line support
mechanical failure
mode of failure
Źródło:
Przegląd Budowlany; 2010, R. 81, nr 5, 5; 23-26
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new index for damage identification in beam structures based on modal parameters
Autorzy:
Taghipour, Reza
Nashta, Mina Roodgar
Bozorgnasab, Moshen
Mirgolbabaei, Hessam
Powiązania:
https://bibliotekanauki.pl/articles/1845026.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
damage detection
beam
modal parameters
mechanical failure
cracks
finite element model
wykrywanie uszkodzeń
belka
parametry modalne
uszkodzenie mechaniczne
pęknięcia
model elementów skończonych
Opis:
The structural damages can lead to structural failure if they are not identified at early stages. Different methods for detecting and locating the damages in structures have been always appealing to designers in the field. Due to direct relation between the stiffness, natural frequency, and mode shapes in the structure, the modal parameters could be used for the purpose of detecting and locating the damages in structures. In the current study, a new damage indicator named “DLI” is proposed, using the mode shapes and their derivatives. A finite element model of a beam is used, and the numerical model is validated against experimental data. The proposed index is investigated for two beams with different support conditions and the results are compared with those of two well-known indices – MSEBI and CDF. To show the capability and accuracy of the proposed index, the damages with low severity at various locations of the structures containing the elements near the supports were investigated. The results under noisy conditions are investigated by considering 3% and 5% noise on modal data. The results show a high level of accuracy of the proposed index for identifying the location of the damaged elements in beams.
Źródło:
Archive of Mechanical Engineering; 2021, LXVIII, 4; 375-394
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Care and nurture patient with Multiple Sclerosis, mechanically ventilated at home – a case report
Autorzy:
Krupa, Sabina
Powiązania:
https://bibliotekanauki.pl/articles/454737.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
case report
mechanical ventilation at home respiratory failure
multiple sclerosis
Opis:
Mechanical ventilation at home is one of the methods of treatment of respiratory failure, but it is not yet widespread in Poland. Domestic ventilation can increase quality of life of patients who can remain at home under the care of a therapeutic team. Multiple sclerosis is one of the diseases that require mechanical ventilation. This disease, leds in many cases to respiratory failure. Here, we describe a case of the patient who has suffered from multiple sclerosis for 23 years and is now mechanically ventilated at home. The paper presents the current state of the patient, problems that affected her and her family, and what changes have occured since the time of her diagnosis with MS.
Źródło:
European Journal of Clinical and Experimental Medicine; 2017, 3; 282-286
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical and reliability aspects of failure in mechanical objects
Autorzy:
Młyńczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2069670.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
physical degradation
mechanical object
reliability
failure
Opis:
Mechanical objects are operated in real world where degradation of material components and variability of processes managed by a man are the main factors influencing its efficiency. Machine degradation is a longlasting process concerning its material structure, components and connections. Loss of machine operations ability is due to failures caused by wear and tear, fatigue, corrosion, overloading, material ageing and many other destructive processes. It is observed close relation between failure modes and reliability models so that knowledge about failures may help analysts creating reliability models and determine the best operational decisions. In the paper it is discussed relation between physical phenomenon and theoretical models as a common platform of decision processes.
Źródło:
Journal of Polish Safety and Reliability Association; 2009, 2; 317--324
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between the single, high dose of ingested baclofen and clinical symptoms
Autorzy:
Sein Anand, Jacek
Zając, Maciej
Waldman, Wojciech
Wojtyła, Andrzej
Biliński, Przemysław
Jaworska-Łuczak, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/987024.pdf
Data publikacji:
2017
Wydawca:
Instytut Medycyny Wsi
Tematy:
acute poisoning
acute respiratory failure
baclofen
mechanical ventilation
Opis:
Introduction and Objectives. Baclofen is a drug used mainly to treat muscle spasticity. Its overdose can lead to lifethreatening clinical symptoms, including acute respiratory failure requiring mechanical ventilation. The aim of this study was to assess the prevalence of selected clinical symptoms associated with baclofen poisoning comparing to an ingested dose. Materials and method. 60 cases of oral baclofen poisoning were analyzed. Gender, age distribution, and correlation between the dose of ingested baclofen were studied, as well as and following clinical parameters: degree of altered consciousness, heart rate, blood pressure, presence of acute respiratory failure, duration of mechanical ventilation, and presence of psychotic symptoms. Results. The study found statistically significant correlations between dosage of ingested baclofen and presence of acute respiratory failure, as well as duration of mechanical ventilation. No statistically significant correlations were found between the dose of ingested baclofen and presence of hypertension, bradycardia, acute psychotic symptoms, or level of consciousness disturbance. However, it was found that patients who suffered from hypertension, bradycardia, and altered mental status ingested a larger dose of baclofen. Conclusions. There is a statistically significant correlation between the dose of ingested baclofen and the presence of acute respiratory failure, and duration of mechanical ventilation. Patients who have taken a single dose of baclofen of 200 mg, or higher, should be managed in centres able to provide continuous monitoring of life functions. Those with a higher level of a single dose of baclofen ingestion (>500 mg), should be hospitalized in a Toxicology Unit or Intensive Care Unit able to provide airway support and mechanical ventilation.
Źródło:
Annals of Agricultural and Environmental Medicine; 2017, 24, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static and Dynamic Mechanical Properties of Nodular Cast Irons
Autorzy:
Vaško, A.
Belan, J.
Tillová, E.
Powiązania:
https://bibliotekanauki.pl/articles/354847.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nodular cast iron
microstructure
mechanical properties
fatigue
failure mode
Opis:
Effects of charge composition on microstructure, mechanical and fatigue properties of nodular cast irons have been studied. For experiments, five melts of nodular cast iron were used – three types of unalloyed nodular cast irons (with different ratio of steel and pig iron in a charge and different additives for regulation of the chemical composition) and two types of alloyed nodular cast irons (SiMo- and SiCu- nodular cast iron). The microstructure of the specimens was evaluated according to a norm and by automatic image analysis. The mechanical properties were investigated by the tensile test, impact bending test and Brinell hardness test. The fatigue tests were carried out at sinusoidal cyclic push-pull loading at ambient temperature. The best mechanical properties were reached in the nodular cast iron alloyed by Si and Cu, what is related to its microstructure.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 185-190
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Środowiskowe aspekty uszczelnień czołowych w przemyśle browarniczym
Environmental aspects of mechanical seal failures in the brewing industry
Autorzy:
Kasprzak, J.
Rewolińska, A.
Powiązania:
https://bibliotekanauki.pl/articles/2072541.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
uszczelnienie czołowe
uszkodzenie
oddziaływanie środowiskowe
mechanical seal
failure
environmental impact
Opis:
W pracy omówiono problem następstw użytkowania uszczelnień czołowych stosowanych w pompach wirowych w przemyśle browarniczym. Przedstawiono szerszy kontekst stosowania uszczelnień czołowych w przemyśle spożywczym, jak również dokonano analizy literatury w aspekcie eksploatacyjnych uszkodzeń uszczelnień czołowych w tej gałęzi przemysłu. Problematykę tę rozszerzono o zagadnienia oddziaływania na środowisko - opisano powszechnie stosowaną metodykę wartościowania oddziaływań środowiskowych oraz - jako przykład - przedstawiono studium przypadku, dotyczące środowiskowej analizy wybranego typu uszczelnienia czołowego.
Issues of mechanical seal failures used in impeller pumps in the brewing industry are described in the paper. A wider context of application of mechanical seals in the food industry is shown, together with the literature analysis concerning mechanical seal failures. These topic was extended to environmental impact issues - commonly applied methods of environmental evaluation of technical objects are described. A case study of environmental analysis of chosen mechanical seal is shown as an example.
Źródło:
Inżynieria i Aparatura Chemiczna; 2013, 2; 107-109
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pathophysiological mechanisms and pharmacological methods of prevention and treatment of bronchopulmonary dysplasia in preterm infants
Autorzy:
Watroba, S.J.
Bryda, J.
Powiązania:
https://bibliotekanauki.pl/articles/2099028.pdf
Data publikacji:
2019
Wydawca:
Instytut Medycyny Wsi
Tematy:
bronchopulmonary dysplasia
preterm infants
steroids
mechanical ventilation
metalloproteinases
respiratory failure
Opis:
Introduction. Bronchopulmonary dysplasia (BPD) is a respiratory disease that is characterized by long-term respiratory failure and mainly affects premature infants with low birth weight (LBW), undergoing mechanical ventilation (MV) or requiring long-term oxygen therapy. In Europe, among newborns with birth weight <1500g, the incidence of BPD is around 15%. Objective. The purpose of this review was to analyze the pathophysiological mechanisms involved in the development of BPD in premature newborns and to discuss the current possibilities of pharmacological prevention and treatment of BPD. Description of the state of knowledge. The BPD pathogenesis is multifactorial. Lung damage is the result of barotrauma and volutrauma due to high-performance MV, actions of reactive oxygen species (ROS) and infectious agents. Currently used methods of pharmacological treatment of severe forms of BPD are mainly based on systemic steroid therapy and can not be considered completely effective and free of side effects. Conclusion. Despite the widespread use of proper pharmacotherapy and dynamic development of new methods of respiratory therapy, mortality in BPD is estimated at around 10% – 20%. Infants with BPD are much more exposed to respiratory infections caused by respiratory syncytial virus (RSV), which may result in the development of bronchial hyperresponsiveness and bronchial asthma. Among children with BPD there are significantly higher cognitive and behavioral deficits compared to healthy children, and cerebral palsy is also significantly more common.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2019, 13, 4; 170-178
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of morpho-anatomical stem properties determining its mechanical strength in selected rye cultivars
Autorzy:
Wójtowicz, T.
Grabowska-Joachimiak, A.
Zieliński, A.
Powiązania:
https://bibliotekanauki.pl/articles/2082669.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
Secale cereale
biodegradable straws
mechanical
properties
failure moment (Bs)
stem anatomy
Opis:
The objective of the research was to compare important properties of the morphological and anatomical structure of stems of four open-pollinated rye cultivars in relation to their mechanical strength expressed by the failure moment, taking into account the possibility of using the stems for the manufacture of natural drinking straws. From the 2nd and the 3rd stem internodes, cross sections were obtained within which the number of large vascular bundles, the diameters of the stem and the central canal, as well as the thicknesses of the stem wall, sclerenchyma and parenchyma were determined. The differentiation in cultivar properties was mainly affected by the location of the internode within the stem. The stem diameter ranged from 5.2 mm (Dańkowskie Rubin) to 5.4 mm (Antonińskie). As compared with the 3rd internode, in the 2nd internode the values of the analysed traits ranged from 5 to 25% higher. In both internodes a significant correlation (r>0.680, p<0.01) between the stem diameter and the central canal diameter was found. In all the cultivars the failure moment depended significantly on the stem diameter for both the internodes (r > 0.638, p < 0.01). The analyses carried out show that the 2nd internode is characterized by the most favourable properties affecting the mechanical strength of rye stems.
Źródło:
International Agrophysics; 2020, 34, 1; 123-131
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consideration of the safety of bungee jumping in relation to mechanical properties of the installation based on a jump accident in Gdynia
Autorzy:
Tomaszewska, Agnieszka
Kłosowski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/38890056.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
bungee rope failure
bungee jumping safety
latex rope
mechanical test
safety factor
Opis:
This paper considers a bungee jumping accident that took place in July 2019 in Gdynia, Poland. The authors conducted an investigation to determine the cause of the bungee rope failure. It was based on mechanical tests concerning the strength of the rope as well as the calculation of the force induced in the rope during the jump. Based on the theoretical and experimental results, the rope safety factor was estimated. It appeared to be three-fold lower than it is recommended in Polish regulations concerning ropes dedicated to lifting people for industrial and public purposes. However, no law regulations strictly concerning bungee installation makes it easy for accidents to occur.
Źródło:
Engineering Transactions; 2022, 70, 4; 407-424
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konsekwencje awarii przewodów wodociągowych na wybranych przykładach
Autorzy:
Kuliczkowska, E.
Kotwica, K.
Powiązania:
https://bibliotekanauki.pl/articles/363763.pdf
Data publikacji:
2017
Wydawca:
Nowoczesne Budownictwo Inżynieryjne
Tematy:
awaria wodociągu
uszkodzenia mechaniczne
zawalenie
wybuch
water pipe failure
mechanical damage
collapse
explosion
Opis:
Agencja Ochrony Środowiska (EPA) twierdzi, że w Stanach Zjednoczonych ma miejsce codziennie ok. 700 pęknięć magistrali wodociągowych spowodowanych starzeniem się rurociągów. EPA szacuje, że USA będą musiały zainwestować ponad 334 mld USD w infrastrukturę przesyłu wody w ciągu najbliższych 25 lat.
Źródło:
Nowoczesne Budownictwo Inżynieryjne; 2017, 3; 86-88
1734-6681
Pojawia się w:
Nowoczesne Budownictwo Inżynieryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of water potential on the failure of potato tissue
Autorzy:
Haman, J.
Konstankiewicz, K.
Zdunek, A.
Powiązania:
https://bibliotekanauki.pl/articles/25420.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
failure
production process
water potential
acoustic emission
mechanical parameter
quality
potato
tissue
plant material
Źródło:
International Agrophysics; 2000, 14, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stress evolution mechanism and thermo-mechanical reliability analysis of copper-filled TSV interposer
Autorzy:
Chen, Yuan
Su, Wei
Huang, Hong-Zhong
Lai, Ping
Lin, Xiao-ling
Chen, Si
Powiązania:
https://bibliotekanauki.pl/articles/1841909.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
through silicon vias
thermo-mechanical reliability
failure mechanism
finite element analysis
3D integrated packaging
thermal cycling experiment
Opis:
Through silicon via (TSV) has become one of the key emerging trends of three-dimensional (3D) packages, as it can realize vertically interconnect between stacked-dies. Due to large mismatch in thermal expansion coefficients (CTE) between the copper via and the silicon, significant mechanical stresses are induced at the interfaces when TSV structure is subjected to thermal stresses, which would greatly affect the reliability and electrical performance of TSV 3D device. In this paper, the relationship between the state of stresses and failure of TSV had been explored by combining finite element model simulation (FEM) and failure physical analysis. The position of the maximum stress of the TSV structure was obtained by FEM analysis. The relationship of stress and displacement change with temperature was also studied. And a thermal cycling experiment was conducted to validate the simulation results. Physical failure analysis after thermal cycling experiment was used to verify the degradation mechanism predicted by thermo-mechanical simulation.
Źródło:
Eksploatacja i Niezawodność; 2020, 22, 4; 705-714
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of turgor and cell size on the cracking of potato tissue
Autorzy:
Konstankiewicz, K.
Zdunek, A.
Powiązania:
https://bibliotekanauki.pl/articles/25276.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
cell size
failure
cracking
potato tuber
cell structure
plant tissue
potato
mechanical property
tissue
plant material
intracellular pressure
turgor
Źródło:
International Agrophysics; 2001, 15, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The micro-mechanisms of failure of nodular cast iron
Autorzy:
Vasko, A.
Chalupova, M.
Powiązania:
https://bibliotekanauki.pl/articles/112051.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
nodular cast iron
ferrite-pearlitic matrix
mechanical properties
micromechanisms of failure
żeliwa sferoidalne
macierz ferrytyczno-perlityczna
właściwości mechaniczne
niewydolność mikromechanizmów
Opis:
The contribution deals with a comparison of the micro-mechanisms of failure of nodular cast irons at static, impact and fatigue stress. Several specimens of ferrite-pearlitic nodular cast irons with different content of ferrite in a matrix were used for metallographic analysis, mechanical tests and micro-fractographic analysis. Mechanical properties were found by static tensile test, impact bending test and fatigue tests. The micro-fractographic analysis was made with use of scanning electron microscope VEGA II LMU on fracture surfaces of the specimens fractured by these mechanical and fatigue tests. Fracture surfaces of analysed specimens are characteristic of mixed mode of fracture. Micro-mechanism of failure of nodular cast irons is dependent on the method of stress.
Źródło:
Production Engineering Archives; 2014, 5, 4; 31-35
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
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