Wyniki wyszukiwania - BazTech

1

Postural stability in Parkinson’s disease patients

Wilczyński J., Pedrycz A., Zieliński E., Ambroży T., Mucha D.

Acta of Bioengineering and Biomechanics

|

2017

|

Vol. 19, no. 4

135--141

EN

Purpose: The aim of the study was to analyze postural stability in Parkinson's disease patients. A total of 32 subjects were tested, including 26 (81.25%) women and 6 (18.75%) men. These were patients with advanced, idiopathic Parkinson’s disease. The disease duration was over 5 years. Methods: The study was conducted in the Posturology Laboratory at the Department of Medicine and Health Sciences, Jan Kochanowski University in Kielce (Poland). The Biodex Balance System was used for evaluation of postural stability. Postural Stability Testing was performed with both feet positioned on a stable surface with the eyes open. Results: The Overall Stability Index in the whole group was 0.5°. The higher Overall Stability Index in women is indicative of slightly worse postural stability compared to men, although in both groups, it was within norms (Z = 2.0545, p = 0.0399). Anterior-Posterior Overall Stability Index (A/P) was an average of 0.35°. The Medial-Lateral Overall Stability Index (M/L) was an average of 0.27°. Both women and men were observed to have higher postural sway in the sagittal plane than the frontal plane. The vast majority of the subjects maintained in Zone A during testing (99.94%), and was slightly bent backwards to the right and in Quadrant IV (61.53%). Conclusions: Regular control of postural stability in Parkinson's disease patients is significant due to the risk of falls.

2

Positive time-varying continuous-time linear systems and electrical circuits

Kaczorek T.

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2015

|

Vol. 63, nr 4

837--842

EN

The positivity of time-varying continuous-time linear systems and electrical circuits are addressed. Necessary and sufficient conditions for the positivity of the systems and electrical circuits are established. It is shown that there exists a large class of positive electrical circuits with time-varying parameters. Examples of positive electrical circuits are presented.

3

A new method for agile aircraft stability evaluation

Pietrucha J., Sibilski K.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

|

2001

|

nr 12

39-44

EN

In the paper a study of high angle of attack dynamics of an advanced trainer aircraft is presented. This dynamics is non-linear, therefore the theory of dynamical system (TDS) approach can be useful in the analysis. The equations of motion used in this investigation assume a rigid aircraft with movable control surfaces. Aerodynamic forces and moments found in equations of motion are valid for a region of higher angles of attack including deep stall phenomena. Results obtained from the TDS are used to predict the nature of the instabilities caused by the bifurcations and the response of the aircraft after a bifurcation is studied. Based data for the MiG29 fighter aircraft are used.