Wyniki wyszukiwania - Biblioteka Nauki

1

Uncorrelated center of pressure sway of human body

100%

Bosek M. , Grzegorzewski B.

Biocybernetics and Biomedical Engineering

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2006

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tom Vol. 26, no. 4

33-38

EN

Analysis of the human center of pressure (COP) trajectory allows quantification of the state of the postural controI system. In our consideration, as a model of COP sway, Langevin equation has been accepted. Using an analysis based on this equation, the friction coefficient and diffusion matrix have been obtained. The diffusion matrix is analysed using its trace, the angle, of rotation of the coordinate system making this matrix diagonal and the ratio nu of greater eigenvalue of this matrix to its trace. In the rotated coordinate system, with respect to the system defined by anteriorposterior and mediolateral directions, COP displacements, for time intervals shorter than 1 s, are uncorrelated. Eigenvalues of the diffusion matrix are diffusion coefficients in this coordinate system. For different populations, dependences between angle [...] and ratio nu have been found. The values of the diffusion coefficients in both directions of the rotated coordinate system were found to be closer one another, with the greater range of the variability of the angle of this rotation.

2

Wymiary wymienia i ich zwiazek z dzienna wydajnoscia mleka w pierwszej laktacji koz rasy bialej uszlachetnionej

100%

Bosek M. , Pawlina E.

Acta Scientiarum Polonorum. Zootechnica

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2003

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tom 02

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nr 1

3-11

3

Wzrost kozlat rasy bialej uszlachetnionej

80%

Pawlina E. , Maziakowska E. , Bosek M.

Zeszyty Naukowe Wydziału Zootechniki. Szkoła Główna Gospodarstwa Wiejskiego w Warszawie

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1997

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tom 01

148-153

4

Langevin equation as a model of COP sway

80%

Bosek M. , Grzegorzewski B. , Kowalczyk A.

Biocybernetics and Biomedical Engineering

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2005

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tom Vol. 25, no. 2

53-59

EN

Static posturography is a method of analysis of the human postural control system, in which the center of pressure (COP) sway at quiet standing is investigated. In this study, the Langevin equation is used as a model of the COP sway. The solution of this equation is the probability density function P(r,t/r(t0),t0). For experimental data, it is possible to represent this function in the form of a histogram. In the wave vector space, the probability density function is represented by the characteristic function, containing full information about the distribution of the variable r - r(t0). For young, elderly and parkinsonian populations, for the excluded as well as for the included visual input, for short wave vector k, the experimental functions are shown to be wen approximated by the Gaussian theoretical functions. However, in these cases, for greater wave vectors, non-Gaussian properties of this variable are observed.

5

The fractal dimension of red blood cell aggregates in dextran 70 solutions

80%

Bosek M. , Szołna-Chodór A. , Antonova N. , Grzegorzewski B.

Optica Applicata

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2018

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tom Vol. 48, nr 3

477--488

EN

Fractal dimension of three dimensional red blood cell aggregates were determined by measurement of their size and sedimentation velocity. The sedimentation of the aggregates was investigated with red blood cells suspended in dextran 70 solutions at concentrations from 2 to 5 g/dL, at hematocrit 5% and 10%. The aggregate velocity and size were measured using an image analysis technique. The velocity vs. radius dependence of the aggregates exhibited a scaling behavior. This behavior showed the fractal structure of the aggregates. It is shown that the fractal dimension of the three dimensional red blood cell aggregates depends on the dextran concentration in the suspension. This parameter exhibited a minimum at dextran concentration between 3 and 4 g/dL. Thus the fractal dimensions increased as the aggregation extent decreased. The obtained results show that the sedimentation experiment together with image analysis is a promising technique to determine the fractal dimension of the three dimensional red blood cell aggregates.

6

Badania zmian wymiarow wymienia koz i zaleznosci miedzy nimi w trakcie laktacji

80%

Bosek M. , Kruszynski W. , Pawlina E.

Zeszyty Naukowe. Przegląd Hodowlany

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2003

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tom 68

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nr 3

215-222

7

Optical properties of deposit of red blood cells suspended in dextran solutions

80%

Strzelecka J. , Bosek M. , Grzegorzewski B.

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tom Vol. 40, nr 1

177--185

EN

The optical properties of the deposit of red blood cells (RBCs) formed during sedimentation have been investigated. The human blood was obtained from healthy donors. RBCs were suspended in isotonic saline containing Dextran 70 of concentrations 2, 4 and 6 g/dl. Hematocrit of the samples was adjusted to 40%. The intensity of the light scattered by the samples of the RBC suspensions as a function of time and altitude from the bottom of a sample was measured. The region occupied by forming and sedimenting aggregates and the region occupied by deposit of the cells can be found in the sample and the temporal dependence of position of the interface separating both regions, called the deposit formation curve, can be determined. This curve exhibits the growth phase and the packing phase. We have obtained the mean intensity of light scattered by the deposit as a function of time. This intensity exhibits a monotonous decay with time over the growth as well as the packing phase, what shows that packing of the deposit occurs in the same way in both phases. The dependence from time of the mean hematocrit of the deposit was determined. We have introduced an empirical expression describing this dependence. Finally, using this dependence, we have obtained the mean intensity of light scattered by the deposit as a function of hematocrit. We have shown that this intensity follows an exponential decay. The values of an optical parameter of the deposit were found from this dependence.

8

Zmiany wymiarow wymion roznych typow u koz rasy bialej uszlachetnionej w trakcie laktacji

80%

Bosek M. , Pawlina E. , Kruszynski W.

Annales Universitatis Mariae Curie-Skłodowska. Sectio EE: Zootechnica

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2003

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tom 21

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nr 1

141-150

9

Analiza nasienia buhajow ras czarno-bialej i czerwono-bialej oraz mieszancow z rasa holsztynsko-fryzyjska

80%

Kruszynski W. , Pawlina E. , Bosek M.

Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Zootechnika

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1997

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tom 43

197-205

PL

Celem pracy było porównanie cech ilościowych nasienia i budowy morfologicznej plemników buhajów najliczniejszych ras w Polsce. Badaniami objęto buhaje ras czarno-białej (cb) i czerwono-białej (czb) oraz mieszańce tych ras z rasą holsztyńsko-fryzyjską (hf). Analizowano cechy ilościowe (liczbę ejakulatów, objętość ejakulatów, liczbę porcji nasienia, koncentrację plemników, ruch postępowy) oraz budowę morfologiczną plemników (wady główne i podrzędne). Uzyskane wyniki wskazują na istotne różnice w cechach ilościowych nasienia tylko pomiędzy niektórymi grupami mieszańców analizowanych ras z rasą hf. Natomiast wyraźnie i istotnie zróżnicowana była budowa morfologiczna plemników zarówno pomiędzy rasami, jak i grupami mieszańców w obrębie ras. Im wyższy udział genów rasy hf, tym obraz morfologiczny nasienia był lepszy.

EN

Black-White and Red-White bulls and their crossbreds with HF were studied. The following features were examined: total quantity of semen, number of ejaculates, mean volume of ejaculate, sperm concentration, progressive motion of sperm and semen morphology (primary and secondary defects). The results of analysis of sperm features don’t differ between breed and groups of crossbreds, but there are significant differences in sperm morphology between breeds and between genetic groups. The higher is HF blood share in genotype the better is semen quality.

10

Fluctuations in settling velocity of red blood cell aggregates

80%

Kempczyński A. , Bosek M. , Grzegorzewski B.

Optica Applicata

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2014

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tom Vol. 44, nr 3

365--373

EN

Sedimentation of red blood cell aggregates was experimentally investigated by optical imaging. Suspensions of red blood cell at low hematocrit were obtained from blood of healthy donors. The velocity of three-dimensional red blood cell aggregates was measured using particle image velocimetry. The magnitude and spatial correlation functions of the velocity fluctuations of the settling aggregates were determined. It is shown that the fluctuations in the settling velocity exhibit characteristic correlations in the form of swirls. The formation of 3-D red blood cell aggregates leads to a large initial swirl. The growth of the aggregates and their sedimentation diminishes the swirls size.

11

Zmiany masy i wymiarow ciala koz rasy bialej uszlachetnionej w zaleznosci od ich wieku

80%

Pawlina E. , Okulewicz T. , Bosek M.

Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Zootechnika

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1999

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tom 45

195-202

PL

Przedstawione wyniki pochodzą z analizy pomiarów 239 kóz rasy białej uszlachetnionej (150 jednorocznych i 89 dwuletnich) hodowanych w 9 koziarniach w południowo-zachodniej Polsce. Badano zmiany masy ciała, wysokości w kłębie, szerokości, głębokości i obwodu klatki piersiowej, obwodu nadpęcia w pierwszych dwóch latach życia oraz zależności między badanymi pomiarami. Stwierdzono, że największym zmianom uległy: masa ciała, długość tułowia, głębokość i szerokość klatki piersiowej. Zanotowano wysokie wartości wskaźników korelacji fenotypowych pomiędzy masą ciała a obwodem klatki piersiowej (r = 0,75 - 0,87), masą ciała a wysokością w kłębie (r = 0,73 - 0,74), masą ciała a długością tułowia (r = 0,72 - 0,75) oraz obwodem i głębokością klatki piersiowej (r = 0,70 – 0,79).

EN

Data of 239 Polish White Improved goats (150 ones at the age of one year and 89 two years old) bred in 9 flocks in south-west part of Poland were studied for changes in body weight, wither hight, body lenght, chest width, chest depth, chest circumference, fore cannon circumference and for phenotypic correlations between analysed traits. It was stated, that body weight, body lenght, chest width and chest depth have changed considerable. High correlation coefficients were found between body weight and chest circumference (r = 0, 75 - 0, 87), body weight and wither height (r = 0, 73 - 0, 74), body weight and body length (r = 0, 72 - 0, 75) and between chest circumference and chest depth (r = 0, 70 - 0, 79).