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Wyświetlanie 1-12 z 12
Tytuł:
Image processing techniques for roi identification in rheumatoid arthritis patients from thermal images
Autorzy:
Wasilewska, A.
Pauk, J.
Ihnatouski, M.
Powiązania:
https://bibliotekanauki.pl/articles/386454.pdf
Data publikacji:
2018
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
dynamic thermography
image processing
segmentation
inflammation
Opis:
Rheumatoid arthritis (RA) is a systemic autoimmune disease that manifests itself by joint inflammation, swelling, pain, tenderness and may involve extra-articular organs in severe cases. Joint inflammatory lesions are associated with higher temperature due to increased vascularity in the area of inflamed tissues. This papers aimed to identify heat patterns from ROIs to interpret the presence of inflammation in rheumatoid arthritis patients. The thermovisual image sequences were collected from 65 patients with Rheumatoid Arthritis (RA). Infrared images were generated by a thermal scanning camera (FLIR E60bx Systems Inc., USA). Separate recordings of left and right foot temperature changes were performed for 3 minute periods. The temperature measurement was performed at the moment right after cold water immersion (post-cooling temperature) and at the moment after thermal recovery (post-recovery temperature). The recording of 3-minute foot thermal recovery was used for analysis. Automatically identified ROI corresponds to the area of the soft tissues covering cuboid and navicular bone.
Źródło:
Acta Mechanica et Automatica; 2018, 12, 1; 49-53
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Safety conditions in dynamic IT examinations of rheumatoid arthritis lesions
Warunki BHP w badaniach zmian w reumatoidalnym zapaleniu stawów za pomocą termografii dynamicznej
Autorzy:
Wasilewska, A.
Pauk, J.
Powiązania:
https://bibliotekanauki.pl/articles/270674.pdf
Data publikacji:
2017
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
termografia w podczerwieni
chłodzenie
woda z lodem
infrared thermography
cooling
ice water
Opis:
Purpose of the article: Human skin temperature distribution is a source of clinically relevant information about tissue pathological process and can be observed with the use of non-contact ad non-invasive measuring technique named infrared thermography (IT). The aim of the study is to establish dynamic IT measurement safety conditions in RA examination in order to prepare the refined study protocol which provides for extracting the most reliable diagnostic thermal data. Experimental part: Thirty participants (20% of males) with diagnosed RA were included in this study. The protocol consisted in registration of thermal recovery processes after immersing left and right foot separately in ice water of less than 0 Celsius degrees. Cooling procedure included immersing left and right foot separately in ice water for 5 seconds. Separate recordings of left and right foot temperature changes were performed for 3 minute periods. The following joint temperatures were measured: ankle joint and 5 metatarsophalangeal joints. Conclusions: Difference between the moment right after immersion and the moment after 3-minute recovery appeared to be the lowest in two different patients’ ankle joints. These results suggest that the slowest rewarming rate occurs in the area of ankle joint.
Cel artykułu: Rozkład temperatury skóry ludzkiej stanowi źródło istotnej klinicznie informacji o patologicznym procesie toczącym się w tkance i można go obserwować za pomocą bezkontaktowej oraz nieinwazyjnej techniki pomiarowej zwanej termografią w podczerwieni (IT). Celem artykułu jest ustanowienie warunków bezpieczeństwa pomiaru za pomocą termografii dynamicznej w badaniach reumatoidalnego zapalenia stawów w celu przygotowania udoskonalonego protokołu badawczego, który zapewnia wydobycie najbardziej istotnych diagnostycznych danych termicznych. Część eksperymentalna: Trzydziestu uczestników (20% mężczyzn) ze zdiagnozowanym RZS zostało włączonych do badania. Protokół uwzględniał rejestrację termicznego powrotu do stanu wyjściowego po zanurzeniu oddzielnie lewej i prawej stopy w wodzie z lodem o temperaturze mniejszej niż 0°C. Procedura chłodzenia polegała na oddzielnym zanurzeniu lewej i prawej stopy w wodzie z lodem na 5 sekund. Wykonano oddzielne 3-minutowe nagrania zmian temperatur lewej i prawej stopy. Zmierzono temperatury następujących stawów: stawu skokowo-goleniowego oraz stawów śródstopnopaliczkowych. Wnioski: Różnica pomiędzy momentem bezpośrednio po zanurzeniu a momentem po 3-minutowej rejestracji okazała się być najniższa w stawach skokowo-goleniowych u dwóch pacjentów. Te wyniki sugerują, że najwolniejsze tempo ponownego nagrzewania występuje w obszarze stawu skokowego.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2017, 22, 3; 205-214
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial perturbations in the solidification process due to mold delaminations
Zaburzenia przestrzenne procesów krzepnięcia wywołane delaminacjami na ściance formy
Autorzy:
Pauk, V.J.
Woźniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/281242.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
solidification
mold delamination
Opis:
The solidification process involving small periodical perturbations due to the system of mold delaminations is considered. Imperfections at the mold wall are modelled by non-ideal thermal contact conditions. It leads to the small perturbation in the solid-liquid interface and in the temperature distribution in the solid phase. With the help of approximate technique, known as the heat-balance integral method, the problem is reduced to the sequence of ordinary differential equations in amplitudes of the Fourier series of the solidification front. The shape of solid-liquid interfaces is shown.
W pracy rozpatruje się zagadnienie dwuwymiarowego niestacjonarnego przepływu ciepła w półprzestrzeni ze zmianami fazowymi. Uwzględniono zaburzenia przestrzenne wywołane delaminacjami pomiędzy falą stałą a ścianką formy. Imperfekcje mają rozkład periodyczny i powodują małe periodyczne zaburzenia zarówno w polu temperatury jak i w ruchomej powierzchni rozgraniczającej fazy stałą i ciekłą. W oparciu o przybliżoną metodę znaną jako metodę całek bilansu ciepła, zagadnienie nie sprowadza się do ciągu równań różniczkowych zwyczajnych dla makro-grubości krzepnącej warstwy oraz amplitud zaburzeń frontu krzepnięcia. Rozwiązania analityczne otrzymano pominąwszy kwadraty pewnych małych wielkości. Na wykresach przedstawiono zmiany zaburzeń w czasie dla różnych wartości wyjściowych parametrow.
Źródło:
Journal of Theoretical and Applied Mechanics; 1998, 2; 321-330
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new classification of hemiplegia gait patterns based on bicluster analysis of joint moments
Autorzy:
Pauk, J
Minta-Bielecka, K.
Powiązania:
https://bibliotekanauki.pl/articles/306712.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
klasyfikacja
porażenie połowiczne
skala Barthel
pacjent
classification
bicluster
hemiplegia
joint moments
Barthel Index
Opis:
Purpose: Hemiplegia is a paralysis on one side of the body resulting from disease or injury to the motor centers of the brain that may lead to difficulty in walking and problems in balance. A new methodology for hemiplegia gait patterns classification based on bicluster analysis, which aims to identify a group of patients with similar gait patterns, and verify if spatial-temporal gait parameters are correlated with the Barthel Index, has been proposed. Methods: Eighteen hemiplegia patients were recruited. Measurements included spatial-temporal gait parameters and joint moments. Gait data were measured using a motion tracking system and two force platforms. Bicluster analysis was used to classify the subjects' gait patterns. The relation between Barthel Index and spatial-temporal gait parameters was determined based on the Spearman correlation. Results: A high correlation between spatial-temporal gait parameters and Barthel Index (r > .5, p < .05) was observed. Well-separated biclusters presenting similarity among the lower limb joints during the gait cycles were obtained from the data. Conclusions: Bicluster analysis can be useful for identifying patients with similar gait patterns. The relation between the gait patterns and the underlying impairments would allow clinicians to target rehabilitation strategies at the patient’s individual needs.
Źródło:
Acta of Bioengineering and Biomechanics; 2016, 18, 4; 33-40
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differences in pediatric vertical ground reaction force between planovalgus and neutrally aligned feet
Autorzy:
Pauk, J
Szymul, J.
Powiązania:
https://bibliotekanauki.pl/articles/306708.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
force platforms
planovalgus
neutrally aligned feet
ground reaction forces
stopa
chód dziecka
biomechanika
Opis:
Ground reaction forces (GRF) reflect the force history of human body contact with the ground. The purpose of this study was to explore human gait abnormalities due to planovalgus by comparing vertical GRF data between individuals with planovalgus and those with neutrally aligned feet. Second we estimated associations between various measurements and vertical GRF parameters in a pediatric population. Boys and girls between the ages of 4 and 18 years (72 planovalgus feet and 74 neutrally aligned feet) took part in this study. Ground reaction forces were recorded by two Kistler platforms and normalized to body weight. Comparison of vertical GRF between planovalgus and neutrally aligned feet suggests that the first and the second peaks of vertical force (Fz1, Fz2) are most affected by planovalgus. The results also indicate that neutrally aligned feet display a different ground reaction force pattern than planovalgus, and that differences between boys and girls may be observed. The shape of the vertical GRF curve can help in clinical interpretation of abnormal gait.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 2; 95-101
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production and evaluation of doubled haploid wheat lines
Autorzy:
Pauk, J
Kertesz, Z
Powiązania:
https://bibliotekanauki.pl/articles/2046625.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wheat line
production
doubled haploid
cross combination
haploid plant
anther response
Triticum aestivum
anther culture
F3 wheat line
F1 population
F4 wheat line
F2 population
combining ability
Opis:
F₁, F₂ populations as well as F₃ and F₄ wheat lines coming from more than 300 cross combinations have been used for androgenic wheat studies and more than 5000 haploid plants were produced. Promising doubled haploid lines were tested together with lines produced in the conventional way in yield trials. The two best doubled haploid lines overyielded the standard. On the basis of results related to the general combining ability it is advisible to cross parents with a good combining ability for characters such as high percentage of responding anthers and embryo/callus induction with parents indicating a good combining ability for green plant production. In this way ideal lines can be obtained for doubled haploid production.
Źródło:
Journal of Applied Genetics; 1997, 38, 4; 425-435
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of the spatial-temporal gait parameters and pressure characteristic in spastic diplegia children
Autorzy:
Pauk, J.
Ihnatouski, M.
Daunoraviciene, K.
Laskhousky, U.
Griskevicius, J.
Powiązania:
https://bibliotekanauki.pl/articles/306432.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
porażenie obustronne
stopa
chód
orteza
rozkład ciśnień
spastic diplegia
spatial-temporal parameters
gait
pressure distribution
ankle-foot orthosis
Opis:
Purpose: Spastic diplegia is the most common form of cerebral palsy. It presents with symmetric involvement of the lower limbs and upper limbs. Children with spastic diplegia frequently experience problems with motor control, spasticity, and balance which lead to gait abnormalities. The aim of this study is twofold. Firstly, to determine the differences in spatial-temporal gait parameters and magnitude of plantar pressure distribution between children with spastic diplegia (CP) and typical children. Secondly, to compare and evaluate main changes of plantar pressure and spatial-temporal gait parameters instead of data between spastic diplegia children with prescribed ankle – solid foot orthosis (AFOs) and without using AFOs. Methods: The evaluation was carried out on 20 spastic diplegia children and 10 agematched children as a control group aged 6–15 years. Twenty children with spastic diplegia CP were divided into two groups: ten subjects with prescribed AFOs and ten subjects without use of assistive device. Patients used the AFOs orthosis for one year. Measurements included in-shoe plantar pressure distribution and spatial-temporal gait parameters. Results: Spatial-temporal gait parameters showed meaningful difference between study groups in velocity, stride length, step length and cadence ( p < 0.05). However no significant differences between patients with and without AFOs were found ( p > 0.05). Significant differences between typical and spastic diplegia children with AFOs were observed in the magnitude of plantar pressure under the toes, the metatarsal heads, the medial arch, and the heel ( p < 0.05). For typical subjects, the highest pressure amplitudes were found under the heel and the metatarsal heads, while the lowest pressure distribution was under the medial arch. In CP patients the lateral arch was strongly unloaded. The peak pressure under heel was shifted inside. Conclusions: Collected data and calculated scores present a state of the gait in test groups, showed the difference and could be valuable for physicians in decision making by choosing qualitative therapy. Furthermore, it allows predicting probability of further possible changes in gait of spastic diplegia patients with AFOs and without it. In conclusion, our current results showed that the use of AFOs, prescribed on a clinical basis by doctors improves gait patterns and gait stability in children with spastic cerebral palsy.
Źródło:
Acta of Bioengineering and Biomechanics; 2016, 18, 2; 121-129
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contact of a rigid flat punch with a wedge supported by the winkler foudation
Autorzy:
Marzęda, J.
Pauk, V.
Woźniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/279884.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
contact problem
elastic wedge
rigid punch
Winkler foundation
Opis:
The contribution deals with the new class of contact problems related with an elastic wedge. It is supposed that the wedge rests on the Winkler foundation. The wedge is in the plane frictionless contact with a rigid flat plate (punch). The problem is solved using the Mellin integral transforms method and is reducet to an integral equation for unknown contact pressure, which was solved numerically. The results concerning the contact pressure distribution and the punch displacement and slope are presented for different values of mechanical and geomatrical parameters.
Współpraca sztywnego płaskiego stempla z klinem opartym na podłożu Winklera. Praca dotyczy nowej klasy zagadnień kontaktowych dla sprężystego klina spoczywającego na podłożu Winklera. Klin ten znajduje się w płskim kontakcie ze sztywną płytą (stemplem). Używając transformacji całkowych Mellina, zagadnienie sprowadzono do równania całkowego względem funkcji nacisków kontaktowych, które rozwiązywano numerycznie. Przedstawiono wyniki dla ciśnienia kontaktowego, osiadania i przechylenia stempla w zależności od różnych mechanicznych i geometrycznych parametrów zagadnienia.
Źródło:
Journal of Theoretical and Applied Mechanics; 2001, 39, 3; 563-575
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors influencing the efficiency of wheat anther culture
Autorzy:
Lantos, C.
Pauk, J.
Powiązania:
https://bibliotekanauki.pl/articles/2117772.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
androgenesis
anther culture
doubled haploid
Triticum aestivum L.
wheat
Opis:
Using in vitro androgenesis serves as a unique opportunity to produce doubled haploid (DH) plants in many species. More benefits of this biological phenomenon have kept these methods in the focus of fundamental research and crop breeding for decades. In common wheat (Triticum aestivum L.), in vitro anther culture is one of the most frequently applied DH plant production methods. The efficiency of in vitro wheat anther culture is influenced by many factors, such as the genotype, growing conditions, collection time, pre-treatments, and compositions of media and culture conditions. According to some critical review, the genotype dependency, low efficiency and albinism are mentioned as limitations of application of the anther culture method. However, some research groups have made significant efforts to diminish the effects of these bottlenecks. Due to the improvements, a well-established in vitro anther culture method can be an efficient tool in modern wheat breeding programs.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2020, 62, 2; 7-16
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High frequency of doubled haploid plant production in spelt wheat
Autorzy:
Lantos, C.
Jenes, B.
Bona, L.
Cserhati, M.
Pauk, J.
Powiązania:
https://bibliotekanauki.pl/articles/19813.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
This is the first study to report an efficient anther culture (AC) method for spelt wheat, which has an increasing importance not only in applied research but also in organic farming and changing nutritional standards. In this study, an efficient AC protocol has been described for ‘GK Fehér’ spelt wheat. The number of AC-derived embryolike structures (ELS) was 62.2/100 anthers, from which we were able to regenerate 30.6 green plantlets per 100 anthers. The percentage of green plantlets production was 89.0% among the regenerated plantlets, while the phenomenon of albinism was restricted (3.8/100 anthers). Altogether, from AC of ‘GK Fehér’ 306 green plantlets were produced in vitro and 241 plants were acclimatized to the greenhouse conditions. Based on ploidy level analyses, 83 spontaneous doubled haploid (DH) plants were produced (8.3 DH plants/100 anthers), so the percentage of spontaneous rediploidization was 34.4%. The spontaneous DH plants produced fertile spikes, while a few seeds were harvested from seven partially fertile plants.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2016, 58, 2
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of mutual aerobic and lower limb muscular activity during cycling
Autorzy:
Griskevicius, J.
Daunoraviciene, K.
Pauk, J.
Troskovas, V.
Powiązania:
https://bibliotekanauki.pl/articles/951811.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
IEMG
aerobik
aktywność fizyczna
mięśnie
iEMG
aerobic capability
physical activity
veloergometry
muscular effort
lower limbs
muscular fatigue
Opis:
The evaluation of physical activity is a complex task that requires performing an analysis of muscular activity and aerobic/anaerobic threshold and it is often difficult to observe and propose a single method. The purpose of the article is to evaluate a relation between aerobic capacity and activity of lower limb muscles via changes of muscle’s EMG signal during physical, sub-maximal veloergometric loading. The activity parameters of 5 lower limb muscles such as semitendinosus, rectus femoris, biceps femoris, gastrocnemius medialis, and tibialis anterior were measured and analyzed during the veloergometric exercise tests and the heart rate and the aerobic capacity were estimated from registered data. The obtained aerobic parameters allow setting an individual and overall voluntary physical capacity. The regression oxygen function presented allows analyzing and predicting the ability of subjects to generate energy while maintaining muscle activity during the exercise. The correlation between the consumption of oxygen and constant physical loading time is determined. It was found that comparing VO2max capabilities the physical effort in the male group was 16% higher than in women. Oxygen consumption and maximum muscle effort dependency on the load time was established. It was observed that the maximal muscular effort appeared before VO2max reached maximal limit in both groups. The maximal oxygen consumption is achieved in the middle or sometimes at the beginning (depending on load) of exercise while maximal muscular effort was found in several phases of cycling: at the beginning and at the end of loading time.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 3; 109-118
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of cyclist’s spine dynamical model
Autorzy:
Griskevicius, J.
Linkel, A.
Pauk, J
Powiązania:
https://bibliotekanauki.pl/articles/306676.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
accelerometer
bicycling
biomechanical model
dynamics
spine
akcelerometr
rower
model biomechaniczny
dynamika
kręgosłup
Opis:
The purpose of the paper is to present a dynamic model of bicyclist’s lumbar spine for the evaluation of linear and angular variation of intervertebral distance in sagittal plane. Ten degrees of freedom biomechanical model of the spine was solved numerically. Larger loads acting on a cyclist spine occur mostly while sitting in a sport position in comparison with recreation or middle sitting. The load on lumbar spine region is influenced by cycle’s tire pressure, road bumps and wheeling speed. The biggest linear and angular displacements were found between L4–L5 vertebras. The biggest load protractile spine muscle experiences in the sport sitting position. Maximum vertebrae rotation and linear variation values in wheeling regime with 1.5 Bar tyres pressure and at a speed of 10 km/h are 0.46° and 0.46 mm. Maximum vertebrae rotation and linear variation values for a 23 year old, 1.74 m high and 73 kg of mass (bicycle mass ~ 7 kg) man in wheeling regime with 3.5 Bar tyres pressure and at a speed of 30 km/h are 3.9° and 1.23 mm. The biggest variation of rotation in sagittal plane between two nearest lumbar spines is about 1°. Because of this displacement the frontal part of last mentioned disc is compressed with 530 N more and dorsal disc part as much less.
Źródło:
Acta of Bioengineering and Biomechanics; 2014, 16, 1; 37-44
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-12 z 12

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