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    Wyświetlanie 1-6 z 6
    Tytuł:
    Effect of X-ray Irradiation on Articular Cartilage Mechanical Properties
    Autorzy:
    Cicek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398818.pdf
    Data publikacji:
    2016-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.G-
    Opis:
    A load bearing tissue found at the ends of articulating bones, the articular cartilage provides low friction surfaces for efficient movement. Its mechanical properties are determined by the structure and composition of type II collagen, proteoglycans and interstitial fluid. This work investigates the effects of X-ray irradiation, previously shown to affect the biological properties of the articular tissue, on mechanical properties of articular cartilage using polarized light microscope for imaging and compressive modulus test applied to articular cartilage to determine the effects of the ionizing radiation on mechanical properties. According to the test results, the relaxation time is significantly longer in control than X-ray exposed samples, while the force is much higher showing that the X-ray irradiation causes the reduction in the stiffness of articular cartilage.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 2; 200-202
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphological Variations of Chondrocytes in Bovine Articular Cartilage Using Confocal Laser Scanning Microscopy
    Autorzy:
    Çıçek, E.
    Arikanoğlu, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197654.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.G-
    Opis:
    Articular cartilage is a highly organized avascular tissue, a matrix consisting of a three-dimensional meshwork of type II collagen fibrils and proteoglycans. To understand the effects of the alteration in chondrocyte shape in response to physiological load in local mechanical properties and, thus, to contribute to experimental load studies, we studied variation of the natural load induced deformations in chondrocytes among five different regions from bovine articular cartilage samples using confocal laser scanning microscopy imaging methods. The morphological differences of the chondrocyte shape, orientation and circularity in articular cartilage were measured. The chondrocytes were observed to be smoother in more loaded regions to the center of the cartilage.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 898-901
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Objectification of Diagnostic Symptoms in Examination of Nervous System Damage by Static Interactions and Kinematic Parameters of Ankle Joint
    Autorzy:
    Nitkiewicz, Sz.
    Śmieja, M.
    Gogolewski, T.
    Majchrowski, A.
    Grabarczyk, Ł.
    Maksymowicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197514.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.G-
    87.85.Ox
    87.85.Tu
    Opis:
    Current diagnostics of patients' condition as well as assumed effects of the used medical diagnostic methods are a significant part of every medical treatment. The process of continuous gathering experience and comparing it with current knowledge leads to development of medical sciences and still growing effectiveness in practice. Numerous relations between particular human body systems and their interactions are very important for fast and precise diagnosis. In the paper, evaluation of the effects of neurosurgical procedures expressed as improvement of mechanical parameters of skeleton muscle system have been considered. The approach presented in the paper assumes description of results in terms of common physical units.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4A; A-27-A-30
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Fixation Patterns on Magnetic Characteristics of Amorphous Glass-Coated Sensoric Microwires
    Autorzy:
    Hudak, R.
    Varga, R.
    Hudak, J.
    Praslicka, D.
    Blazek, J.
    Polacek, I.
    Klein, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1202355.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.G-
    87.85.fk
    85.70.Ay
    Opis:
    Some of the frequent reasons of titanium implant failures in human body are incorrect biomechanical interactions within the tissue-implant interface and inflammatory processes arising around the implant's application area. For both processes, it is crucial to locate them and intervene in time. One of the monitoring possibilities of the mentioned processes is the application of amorphous glass-coated sensoric microwires (AGCSM). Magnetic characteristics of these microwires are influenced by both mechanical tension (magnetoelastic interaction of the magnetic moment with mechanical stress) and by temperature (different coefficient of thermal expansion of the metal core and glass coating). The key task, in order to change the magnetic characteristics of AGCSM from both clinical and scanning point of view, appears to be the fixation pattern of AGCSM in the implant's body. The presented study shows the impact of four types of AGCSM fixation patterns (at one ending, at both endings, in the middle and along the entire length) on the thermal response process tested in laboratory conditions. The obtained results will enable to establish the AGCSM fixation methodology in the implant's body in order to achieve optimal output temperature parameters form the implant and the tissue-implant interface by magnetic contactless measurements.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 417-418
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Holographic Measurement of Dental Tissue Contraction and Stress, due to Postpolymerization Reaction
    Autorzy:
    Pantelić, D.
    Blažić, L.
    Savić-Šević, S.
    Murić, B.
    Vasiljević, D.
    Panić, B.
    Belić, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047904.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.40.Kw
    87.85.G-
    87.15.rp
    87.10.Kn
    Opis:
    Polymerization contraction of dental photo-polymer composites induces internal stress, in a tooth cavity. This stress is measured indirectly by, first, holographic determination of tooth deformation, with consequent calculation of stress using finite element method. Real time holographic technique enabled observation of dental deformation in all stages of polymerization. Specially constructed blue-LED light source was used to polymerize photopolymer composite. We have found that polymerization continues even after illumination is over. Consequently, stress is increased, too.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1157-1160
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computational material analysis of structural and hemodynamic model of coronary stent by CFD/FEA in computer aided mechanical engineering approach
    Autorzy:
    Karaçal, Ö.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070469.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.G-
    81.70.Bt
    82.20.Wt
    87.10.Kn
    87.15.A-
    Opis:
    With the development of new technologies, it is very popular to use a coronary stent that is a small mesh tube-shaped medical device deployed to treat narrow or weak arteries as part of a procedure called percutaneous coronary intervention. Several aspects, such as stent design, stent wire type, mechanical and material characteristics of stent have different influences on stent intervention. It has not been reported about what impacts on stent struts by the hemodynamic behavior on stent material and very few numerical studies have considered both the mechanical and hemodynamic impact of stent implementation. Computational simulation method for realization of realistic structural and hemodynamic micro environment model in this research provided valuable results of long-term functional knowledge of stent material behavior that are time consuming and expensive to determine otherwise. Computational fluid dynamics and finite element analysis simulation models were investigated and developed to evaluate engineering properties that affect stent functional attributes. These characteristics are dependences of material properties on blood flow conditions such as structural load, shear-strain rate, radial strength, and wall shear stresses, which need to be scientifically explored. To understand the material (Fe-18Cr-14Ni-2.5Mo as stainless steel 316LVM) mechanical performance of the stent, a finite element analysis simulation model was established when exposed to pulsatile blood pressure. In this study, computational fluid dynamics model was generated to calculate the wall shear stresses and strain distribution in stented vessel carrying blood to heart. The analytical analysis of mechanical and hemodynamic conduct of a stent in this investigation may help for better designs of stent, and provide deeper comprehension to support clinical cardiovascular surgeons and guide potential therapeutic strategies.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 249-251
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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