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Number of results: 7
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Keywords stroke human health
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Abstract

Prof. Anna Członkowska from the 2nd Department of Neurology at the Institute of Psychiatry and Neurology, a corresponding member of the Polish Academy of Sciences, discusses the definition of a stroke, new ways to help post-stroke patients recover, and reasons why time is of the essence.

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Authors and Affiliations

Anna Członkowska
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Abstract

A role of radial corona current in a lightning discharge is discussed in the paper. It is shown that the corona current concept previously introduced by Cooray for lightning return stroke models of distributed-current-source (DCS) type, and later, by Maslowski and Rakov for lumped-current-source (LCS) type models enables to show duality between these two types of models. Further, it is demonstrated that the corona current is useful during consideration of dynamics of the lightning-channel corona sheath. As an example of application of presented approach a relaxation model of charge motion in the corona sheath is analysed together with plots which show the rate of expansion and shrinkage of the lightning corona sheath on both microsecond and millisecond time scales.
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Authors and Affiliations

Grzegorz Masłowski
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Abstract

This year the new international guidelines of WIST (The World Federation for Interventional Stroke Treatment) on the physician’s training in the interventional acute stroke treatment were published. WIST multispecialty guidelines outline competency and quality standards for physicians and centers to perform safe and effective endovascular stroke treatment with mechanical thrombectomy. The role of quality control and quality assurance is highlighted. WIST establishes an individualized approach to acquiring clinical knowledge and procedural skills to meet the competency requirements for certification of interventionalists of various disciplines and stroke centers in endovascular treatment. WIST guidelines encourage acquisition of skills using innovative training methods such as structured supervised high-fidelity simulation and procedural performance on human perfused cadaveric models. In Poland in 2018 a pilot program on mechanical thrombectomy was established, however endovascular acute stroke treatment is still underused due to limited patients access to stroke centers and too small number of operators.
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Authors and Affiliations

Piotr Musiałek
1
Rafał Niżankowski
2
Adam Witkowski
3

  1. Klinika Chorób Serca i Naczyń Uniwersytetu Jagiellońskiego,KSS im. Jana Pawła II, Kraków
  2. SanoScience i małopolski konsultant wojewódzki w dziedzinieangiologii, Kraków
  3. Klinika Kardiologii i AngiologiiInterwencyjnej, Narodowy Instytut Kardiologii w Warszawie
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Abstract

An alternative FEM algorithm of fi nding piston ring pressure distribution to a contact simulation is introduced. The method is basing on an analytical determining of required nodal displacement boundary conditions. Its several confi gurations are tested using APDL and compared to a no-separation contact simulation of a simple 2D fi nite element model of a two-stroke piston ring made of Titanium alloy. Each of the methods tested in the paper brings displacement result and Huber-Misses equivalent stresses close to each other. However, only one of those brings resulting contact pressure close to a no-separation contact simulation. Nonetheless, the obtained confi guration occurred to be less computationally effi cient than no- separation contact simulation performed in an ANSYS software.
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Authors and Affiliations

Marcin Kaliszewski
Paweł Mazuro
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Abstract

This study developed an ankle rehabilitation device for post-stroke patients. First, the research models and dynamic equations of the device are addressed. Second, the Sliding Mode Controller for the ankle rehabilitation device is designed, and the device's response is simulated on the software MATLAB. Third, the ankle rehabilitation device is successfully manufactured from aluminum and uses linear actuators to emulate dorsiflexion and plantarflexion exercises for humans. The advantages of the device are a simple design, low cost, and mounts onto rehabilitative equipment. The device can operate fast through experiments, has a foot drive mechanism overshoot of 0°, and a maximum angle error of 1°. Moreover, the rehabilitation robot can operate consistently and is comfortable for stroke patients to use. Finally, we will fully develop the device and proceed to clinical implementation.
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Bibliography

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Authors and Affiliations

Minh Duc Dao
1
ORCID: ORCID
Xuan Tuy Tran
2
Dang Phuoc Pham
1
Quoc Anh Ngo
1
Thi Thuy Tram Le
3

  1. Faculty Technology and Engineering, The Pham Van Dong University, Quang Ngai, Vietnam
  2. Faculty Technology of Mechanical Engineering, The University of Danang – University of Science and Technology, Danang, Vietnam
  3. The Faculty Electronic-Electrical, The Quang Nam College, Quang Nam, Vietnam
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Abstract

Given the significance of teacher characteristics in student motivation for class attendance, the present paper aimed to investigate the roles of teacher success, credibility, and stroke in students’ Willingness to Attend Classes (WTAC). To this aim, a total number of 276 undergraduate students majoring in Teaching English as a Foreign Language (TEFL) and English Language and Literature completed four scales: Characteristics of Successful EFL Teachers Questionnaire (Moafian & Pishghadam, 2008), Teacher Credibility Scale (McCroskey & Teven, 1999), Student Stroke Scale (Pishghadam & Khajavi, 2014), and WTAC Scale (Rajabnejad, Pishghadam, & Saboori, 2017). For data analysis, Pearson multiple correlation coefficients and path analysis were employed. The results of correlational analyses revealed a significantly positive correlation, first, between teacher success and students’ WTAC, secondly, between teacher credibility and students’ WTAC, and thirdly, between teacher stroke and students’ WTAC. Furthermore, the results of path analysis indicated that students’ WTAC was significantly predicted by teacher success, credibility, and stroke. At the end, the results were discussed in light of previous findings, and potential conclusions were made in the EFL context accordingly.

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Authors and Affiliations

Reza Pishghadam
Ali Derakhshan
Kiyana Zhaleh
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Abstract

In this paper, an experimental method was utilized to investigate acoustic emission (AE) characteristics and to identify emission sources of the nonlinear AE signal on the cylinder body of a large low-speed two-stroke marine diesel engine in real-working conditions on the sea in misfiring and normal firing modes. Measurements focused on the AE signal acquired in a transverse direction in low-frequency (20–80 kHz), medium-frequency (100–400 kHz) and high-frequency (400–900 kHz) ranges. The collected signals were analyzed on the crank angle and crank angle-frequency domains. The results showed that all potential sources of the nonlinear AE signal could be mapped in the low-frequency range. However, only the AE signal caused by the combustion process at around the top dead center could be well-observed in the medium-to-high-frequency range. The findings also revealed that in normal firing conditions, the AE energy radiated by friction in the down-stroke period was smaller than in the up-stroke process due to gas-sealing forces. Moreover, the AE energy in the misfiring condition was higher than in the normal firing state. These outcomes considerably contributed understandings to characteristics of friction and wear around the mid-stroke area of the cylinder on a two-stroke marine diesel engine.
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Authors and Affiliations

Xuan Thin Dong
1
Manh Hung Nguyen
1

  1. Vietnam Maritime University Hai Phong, Vietnam

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