A. Guzik

article

Solar Models with Dynamic Screening and Early Mass Loss Tested by Helioseismic, Astrophysical, and Planetary Constraints

Suzannah R. Wood, Katie Mussack, Joyce A. Guzik

Solar Physics > 2018 > 293 > 7 > 1-14

The faint young Sun paradox remains an open question. Presented here is one possible solution to this apparent inconsistency, a more massive early Sun. Based on the conditions on early Earth and Mars, a luminosity constraint is set as a function of mass. We examine helioseismic constraints of these alternative mass-losing models. Additionally, we explore a dynamic electron screening correction in...

article

Assessment of the relationship between observational Wisconsin Gait Scale and Gait indexes such as Gait Deviation Index and Gait Variability Index in individuals after stroke

A. Guzik, M. Drużbicki, A. Wolan-Nieroda, P. Kiper, more

Annals of Physical and Rehabilitation Medicine > 2018 > 61 > S > e174

There are no studies evaluating compatibility of visual gait assessment scales and Gait Deviation Index (GDI), Gait Variability Index (GVI) in individuals after stroke. The study was designed to compare results of the observational Wisconsin Gait Scale (WGS) and the global gait indexes such as GDI and GVI, constituting an objective method of assessing gait. The objective was to answer the question...

article

The use of the Gait Variability Index for the evaluation of individuals after a stroke

A. Guzik, M. Drużbicki, G. Przysada, M. Szczepanik, more

Acta of Bioengineering and Biomechanics > 2018 > Vol. 20, no. 2 > 171--177

The Gait Variability Index (GVI) summarizes overall gait quality, taking into account spatiotemporal parameters from a 3-dimensional gait analysis. However, there are no studies evaluating changes in gait patterns after stroke, based on the GVI. The study was designed to assess usefulness of the GVI for evaluation of gait pathology in subjects with stroke, compared to healthy individuals. Methods:...

article

Analiza zakresu ruchów w stawach kończyny górnej podczas swingu golfowego z wykorzystaniem urządzenia kinect oraz w warunkach rzeczywistych - badania pilotażowe

A. Guzik-Kopyto, M. Reich, A. Bieniek

Aktualne Problemy Biomechaniki > 2017 > z. 12 > 21--28

Golf to dyscyplina sportu, wymagająca od gracza bardzo dużej precyzji. Celem niniejszej pracy była analiza kinematyki kończyny górnej podczas swingu golfowego w warunkach rzeczywistych oraz z wykorzystaniem urządzenia Kinect. Pilotażowe badania doświadczalne przeprowadzono na jednej osobie, która wykonywała swing golfowy 10 razy w każdym etapie badań. Po przeprowadzeniu analizy kinematycznej zaobserwowano...

article

Formation of Fe and Ni substituted LiMn2–XMXO4 nanopowders and their crystal and electronic structure and magnetic properties

E. Talik, L. Lipińska, A. Guzik, P. Zajdel, more

Materials Science Poland > 2017 > Vol. 35, No. 1 > 159--172

The Pechini sol-gel method was applied to obtain LiMn_2–xT_xO₄(T = Ni, Fe; x = 0.1 to 0.5) nanopowders. Crystal and electronic structures, chemical composition and magnetic properties of the materials were characterized by X-ray diffraction, XPS, SEM/EDX microscopy, prompt gamma-ray activation analysis (PGAA), Mössbauer spectroscopy and magnetic susceptibility, respectively. XRD measurements showed...

article

Relationships between walking velocity and distance and the symmetry of temporospatial parameters in chronic post-stroke subjects

A. Guzik, M. Drużbicki, G. Przysada, A. Kwolek, more

Acta of Bioengineering and Biomechanics > 2017 > Vol. 19, no. 3 > 147--154

Purpose: Subjects with post-stroke hemiparesis frequently present with asymmetric gait patterns. Symmetry, reflecting similarities in temporospatial, kinematic parameters, is an important measure of gait assessment. The study was designed to examine the relationships between asymmetry of temporal, spatial and kinematic gait parameters and walking velocity and distance. Methods: Temporospatial and...

article

Structural, electronic and magnetic properties of Y4Al2O9 sol-gel powders with Tb3+ and Yb3+ co-doping

E. Talik, A. Guzik, P. Zajdel, L. Lipiſska, more

Materials Research Bulletin > 2016 > 83 > C > 56-64

The modified sol-gel method was used to obtain of Y₄Al₂O₉ nanopowders co-doped with Tb, Yb cations. SEM microstructure examination proved that nanoscale grains were obtained in all samples. Complex lines of Y3d, O1s and Al2p were found in the photoelectron spectra. The XPS energy gap in the valence band was estimated as about 4.6eV. Results of SQUID magnetometry measurements confirmed nominal concentration...

chapter

Blitz model for the eruptions of eta carinae

Nathan Smith, Joyce A. Guzik, Henny J. G. L. M. Lamers, Joseph P. Cassinelli, more

Lecture Notes in Physics > Variable and Non-spherical Stellar Winds in Luminous Hot Stars > 249-250

Following the “Great Eruption” of 1843, η Carinae underwent a second major eruption around 1890. We suggest a preliminary working model developed during this meeting (in one night, hence the term “Blitz”) that attempts to explain the temporal development of the 19th century eruptions of η Car, as well as the formation of the Homunculus nebula (note that we are not offering an explanation for the cause...

article

Evaluation of incidence frequency and analysis of risk factors for the occurrence of back pain in a randomly-chosen group in the Podkarpackie Region of south-eastern Poland

M. Druzbicki, G. Przysada, A. Guzik, A. Kwolek, more

Annals of Agricultural and Environmental Medicine > 2016 > 23 > 2

chapter

Pulsation hydrodynamics of luminous blue variables and pulsation-driven winds

Joyce A. Guzik, Arthur N. Cox, Kate M. Despain, Michael S. Soukup

Lecture Notes in Physics > Variable and Non-spherical Stellar Winds in Luminous Hot Stars > 337-344

Many physical factors, including radial and nonradial pulsation, rotation, radiation pressure, convection, magnetic fields, or dynamical instabilities may play important roles in the hydrodynamics of Luminous Blue Variables. We review the current status of hydrodynamic modeling of LBV envelopes, and describe results of our models using the one-dimensional nonlinear hydrodynamics code of Ostlie and...

article

Ocena symetrii ruchów wykonywanych kończyną górną podczas czynności picia z kubka przez osoby zdrowe

A. Guzik-Kopyto, A. Bieniek, M. Lipiarz

Aktualne Problemy Biomechaniki > 2016 > z. 11 > 27--32

W pracy przedstawiono wyniki badań doświadczalnych dotyczących kinematyki kończyn górnych podczas czynności picia z kubka. Celem pracy było określenie różnic w kinematyce wykonywanych ruchów pomiędzy kończyną prawą i lewą na podstawie wskaźnika symetrii w stawach kończyny górnej: ramiennym, łokciowym i nadgarstkowym. W badaniach wzięło udział 18 zdrowych mężczyzn. Badania wielkości kinematycznych...

article

Evaluation of the impact of exercise of gait on a treadmill on balance of people who suffered from cerebral stroke

M. Drużbicki, G. Przysada, A. Guzik, A. Kwolek, more

Acta of Bioengineering and Biomechanics > 2016 > Vol. 18, no. 4 > 41--48

Purpose: The aim of the study is to define the impact of exercise on a treadmill on static balance and stability of posture in a group of patients after cerebral stroke rehabilitated in a late period, with an application of a treadmill with the function of visual biofeedback. Methods: The examination was carried out in a group of 46 people in a late period after ischemic cerebral stroke. The patients...

article

Ocena zdolności siłowych dłoni pacjentów z zaburzeniami neurologicznymi

M. Zarwańska, A. Guzik-Kopyto

Aktualne Problemy Biomechaniki > 2015 > z. 9 > 135--138

Udar mózgu jest jedną z najpoważniejszych chorób stanowiących trzecią z najczęstszych przyczyn zgonów. W oparciu o badania siły ścisku dłoni z wykorzystaniem dynamometru elektronicznego firmy Vernier, podjęto próbę oceny zdolności siłowych dłoni pacjentów po przebytym udarze, a także przedstawiono znaczenie wdrażania nowoczesnych technologii, pomocnych przy analizach postępów rehabilitacji. To właśnie...

article

Electronic and crystal structure, EPR and magnetic investigations of YF3:1%RE (RE=Pr, Ho, Er and Tm) and LaF3:1%Pr nanocrystals

E. Talik, P. Zajdel, A. Guzik, D. Skrzypek, more

Journal of Alloys and Compounds > 2014 > 616 > C > 556-568

A new chemical synthesis route by a thermal decomposition of nitrates and acetates, preceded by solution displacement reaction, was successfully applied to obtain the YF₃:1%RE (RE=Pr, Ho, Er and Tm) and LaF₃:1%Pr nanocrystals. The samples were characterized by the following methods: X-ray diffraction, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), magnetic susceptibility...

article

Investigations of YF3: 1% Er nanocrystals

A. Skuta, E. Talik, L. Lipińska, M. Michalska, more

Journal of Crystal Growth > 2014 > 401 > C > 480-483

New chemical synthesis was successfully applied to obtain YF₃: 1% Er nanocrystals. This method is a thermal decomposition of nitrates and acetates, preceded by solution displacement reaction. The sample was characterized by the following methods: X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and magnetic susceptibility thermal dependence measurements. The obtained...

article

X-Ray diffraction, electronic structure and magnetic characterization of nano and single crystals SrLaAlO4: Mn optical materials

E. Talik, A. Pajączkowska, A. Guzik, P. Zajdel, more

Materials Science & Engineering B > 2014 > 182 > Complete > 74-80

The XRD, XPS, SEM and magnetic characterization of the nano and single crystals SrLaAlO ₄ doped with Mn were done. The sol–gel method was used to obtain the nanopowder and SEM imaging confirmed the sub-micron size of grains. The single crystals were grown by the Czochralski method. All compounds exhibit excess of strontium and deficiency of aluminium. The unit cell volumes increase with the...

article

Magnetic properties of manganese doped PrAlO₃ monocrystalline fibres

A. Guzik, E. Talik, A. Pajączkowska, S. Turczyński, more

Materials Science-Poland > 2014 > 32 > 4 > 633-640

Monocrystalline fibres of undoped PrAlO₃ and PrAlO₃:0.1 Mn, have been grown by the pulling-down method under nitrogen atmosphere. The as-grown crystal doped with Mn had a visible brown core surrounded by a green ring, whereas this effect was weaker for the undoped PrAlO₃. A coloration of the brown core was caused by a presence of Pr⁴⁺ ions. The presence of the Pr⁴⁺ ions was confirmed by XPS and magnetic...

article

Wyznaczanie obciążeń w układzie szkieletowo-mięśniowym kończyny górnej na podstawie badań kinematyki z wykorzystaniem inercyjnego systemu pomiarowego

A. Guzik-Kopyto, R. Michnik, P. Wodarski, M. Gzik, more

Modelowanie Inżynierskie > 2014 > T. 22, nr 53 > 62--69

Większość spotykanych w literaturze modeli szkieletowo-mięśniowych kończyny górnej pozwala z dobrym przybliżeniem wyznaczyć wartości sił mięśniowych i reakcji w stawach. Wśród modeli można wyodrębnić te, których ruch inicjowany jest z wykorzystaniem danych obliczanych na podstawie funkcji matematycznych oraz z wykorzystaniem danych pochodzących z systemów do analizy ruchu. W ramach pracy zaproponowano...

article

Rola estrogenów i czynników środowiskowych w raku prostaty

A. Guzik, E. Sawicka, A. Dlugosz

Bromatologia i Chemia Toksykologiczna > 2014 > 47 > 1

Rekord w opracowaniu

article

Analiza kinematyki kończyny górnej podczas rzutu lotką dart

M. Bereska, B. Baryń, M. Piecko, M. Śmiech, more

Aktualne Problemy Biomechaniki > 2014 > z. 8 > 13--16

Technika rzutu odgrywa niebagatelną rolę w większości dyscyplin sportowych, związanych z rzutem przedmiotu do celu. W artykule przedstawiono metodykę badań kinematyki kończyny górnej, podczas rzutu lotką dart. Pomiary zostały przeprowadzone za pomocą elektrogoniometrów Noraxon. Wyniki pomiarów wykorzystano do wyznaczenia zakresów ruchu w stawach kończyny górnej oraz oceny kinematyki rzutu na celność.

INFONA - science communication portal

Search results for: A. Guzik

Solar Models with Dynamic Screening and Early Mass Loss Tested by Helioseismic, Astrophysical, and Planetary Constraints

Assessment of the relationship between observational Wisconsin Gait Scale and Gait indexes such as Gait Deviation Index and Gait Variability Index in individuals after stroke

The use of the Gait Variability Index for the evaluation of individuals after a stroke

Analiza zakresu ruchów w stawach kończyny górnej podczas swingu golfowego z wykorzystaniem urządzenia kinect oraz w warunkach rzeczywistych - badania pilotażowe

Formation of Fe and Ni substituted LiMn2–XMXO4 nanopowders and their crystal and electronic structure and magnetic properties

Relationships between walking velocity and distance and the symmetry of temporospatial parameters in chronic post-stroke subjects

Structural, electronic and magnetic properties of Y4Al2O9 sol-gel powders with Tb3+ and Yb3+ co-doping

Blitz model for the eruptions of eta carinae

Evaluation of incidence frequency and analysis of risk factors for the occurrence of back pain in a randomly-chosen group in the Podkarpackie Region of south-eastern Poland

Pulsation hydrodynamics of luminous blue variables and pulsation-driven winds

Ocena symetrii ruchów wykonywanych kończyną górną podczas czynności picia z kubka przez osoby zdrowe

Evaluation of the impact of exercise of gait on a treadmill on balance of people who suffered from cerebral stroke

Ocena zdolności siłowych dłoni pacjentów z zaburzeniami neurologicznymi

Electronic and crystal structure, EPR and magnetic investigations of YF3:1%RE (RE=Pr, Ho, Er and Tm) and LaF3:1%Pr nanocrystals

Investigations of YF3: 1% Er nanocrystals

X-Ray diffraction, electronic structure and magnetic characterization of nano and single crystals SrLaAlO4: Mn optical materials

Magnetic properties of manganese doped PrAlO₃ monocrystalline fibres

Wyznaczanie obciążeń w układzie szkieletowo-mięśniowym kończyny górnej na podstawie badań kinematyki z wykorzystaniem inercyjnego systemu pomiarowego

Rola estrogenów i czynników środowiskowych w raku prostaty

Analiza kinematyki kończyny górnej podczas rzutu lotką dart

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