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    Wyświetlanie 1-15 z 15
    Tytuł:
    The Influence of Infrasounds on the Electrocardiograph Patterns in Humans
    Autorzy:
    Kasprzak, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537469.pdf
    Data publikacji:
    2010-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.50.Y-
    Opis:
    This study investigates how infrasound exposure should influence the electrocardiograph (ECG) patterns and the functioning of the cardiovascular system. Infrasound waves are widespread and common and now perceptible in the working environment (particularly in industry) as well as in the recreation grounds (natural sources of infrasounds). the main sources of infrasounds include heavy machines, transport and materials handling installations, as well as natural phenomena, such as blowing winds, storms or flowing waters. Research work has now established that low-frequency noise affects the morphology of the electric biopotentials of human brain and influence the blood pressure, the level of electrodermal activity and visual-motional coordination in humans. the effects of infrasounds on fluctuations of the ECG patterns have received little attention so far. This study summarises the research data to determine how low-frequency noise with frequency f = 7 Hz and the acoustic pressure level SPL=120 dB (HP) should influence the ECG patterns. Experiments were performed on a group of 33 participants. Thus obtained experimental data indicate that infrasound exposure leads to major changes in the functioning of human heart.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 1; 87-90
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Infrasound on the Alpha Rhythm of EEG Signal
    Autorzy:
    Kasprzak, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490447.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.50.Y-
    Opis:
    The alpha waves were first registered and named by Berger in 1929. They are oscillations in the frequency range 8-12 Hz, originating from the occipital lobe during wakeful relaxation with closed eyes. The alpha blockage is the result of desynchronisation of the bioelectric activity of the brain induced by sensory stimulation. When the subject's eyes are closed, the alpha rhythm is generated. As soon as the eyes are open, alpha disappears. This is called alpha block and may be elicited also by any form of sensory stimulation. This replacement of the alpha rhythm is also called desynchronization because it represents a change of the synchronized activity of neural elements. This state is also called arousal or alerting response. Infrasounds are acoustic waves of frequency below 20 Hz. They are not directly perceived by humans because the natural frequency of vibrations of the part of the basilar membrane distant from the round window is about 20 Hz. The hearing organ, therefore, is well adapted to receive waves with frequency in excess of 20 Hz. The purpose of the experiment was to determine the effects of infrasound waves on variations in the alpha waves. Tests were done on a group of 32 participants. The experiment showed that infrasounds of frequency f = 7 Hz and acoustic pressure level SPL = 120 dB (HP) cause a statistically significant reduction of the alpha rhythm power.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1A; A-061-A-064
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Binaural Beats on EEG Signal
    Autorzy:
    Kasprzak, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504350.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.50.Y-
    Opis:
    Binaural beats are subjective hearing sensations, which occur when one of tone signals is applied to one ear, and the other one, with a slightly different frequency is applied to the second ear. A listener then receives a resultant sound with an amplitude which changes with a frequency equal to the difference of frequency of applied signals. The aim of this thesis was to examine the influence of binaural beats on changes in the morphology of the brain bioelectrical signal. Verification of previous studies, such as stimulation of binaural beats affects the brain and can cause changes in other frequency bands. Previous studies have been conducted on individual leads and dealt with the occurrence of follow up effect. In the research there were used binaural beats with a frequency of f=10 Hz. The left ear was exposed to a signal with a frequency of 100 Hz, and the right ear - to a signal with a frequency of 110 Hz, the acoustic pressure level SPL = 73 dB. The research was conducted on a sample group of 20 people. The analysis of average amplitudes of spectral density function of EEG strength signal proved that the exposition of binaural beats brought about a follow-up effect, which means that a component frequency in the EEG signal morphology was observed which corresponds with a frequency of the exposed binaural beats. It was also noted that during the exposition of binaural beats, there occurs a statistically significant decrease of average amplitudes of spectral density function of EEG strength signal for alpha and beta frequency ranges. However, it was observed that the amplitude of spectral density function of the strength has increased in theta frequency range.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6A; 986-990
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Infrasound Noise from Wind Turbines on EEG Signal Patterns in Humans
    Autorzy:
    Kasprzak, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197502.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.50.Y-
    43.28.Dm
    87.19.lr
    Opis:
    The purpose of this paper is to determine the effect of infrasound noise from wind turbines (up to 20 Hz) on the changes in the EEG signal patterns in humans. The experimental study was undertaken to investigate the effect of a 20 minutes long infrasound exposure on humans. The acoustic signal was recorded at a distance of 750 meters from the wind turbine and the frequency components above 20 Hz were then filtered out. Research work undertaken so far to investigate the impacts of wind turbine noise on humans would mostly rely on questionnaire tools and subjective assessment given by respondents. This study focuses on the effects of infrasound noise from wind turbines on variations of EEG signal patterns in an attempt to develop a more objective measure of the infrasound noise impacts. The experimenal study was conducted in a pressure cabin where the EEG procedure was performed. Analysis of the EEG signals reveals the changes between the EEG patterns registered during the three successive stages of the study.The results indicate some changes in EEG signal patterns registered under exposure to wind turbine noise. Moreover, the specific frequency ranges of the EEG signals are found to be altered.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4A; A-20-A-23
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Wind Turbine Infrasound Emission on Subjectively Rated Activation Level
    Autorzy:
    Kasprzak, C.
    Skrodzka, E.
    Wiciak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197517.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.50.Y-
    43.28.Dm
    87.19.Lr
    Opis:
    The problem of low-frequency acoustic waves emitted by wind turbine farms has become a great challenge to acousticians in Europe for more than 20 years. In Poland wind farm industry is growing rapidly and generates questions about the influence of such sounds on human organism. A short survey of previously published reports concerning subjectively perceived influence of wind turbines on people living next to wind farms is given together with the results of the Thayer's test measuring the difference in activation level before and after exposition on infrasound wave generated by a wind turbine. Statistically significant increase of the High Activation Level representing a tension type arousal has been revealed.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4A; A-45-A-48
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of the Narrow-Band Noise in the Range 4-8 Hz on the Alpha Waves in the EEG Signal
    Autorzy:
    Kasprzak, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400068.pdf
    Data publikacji:
    2013-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.50.Y-
    43.28.Dm
    87.19.lr
    Opis:
    The paper summarises the results of experiments carried out to investigate the effect of a narrow-band noise in the range 4-8 Hz and of the acoustic pressure SPL = 110 dB(HP) on the alpha waves in the EEG signal. The test group included 23 males aged 21-33. It is found out that white noise in the infrasound range 4-8Hz leads to changes of amplitudes of the spectral power density of alpha waves. The tests reveal a statistically significant reduction of the alpha wave amplitude during the infrasound exposure and an amplitude increase when the exposure is over.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 6; 980-983
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Certain Problems Concerning Environmental Impact Assessment of Wind Turbines in Scope of Acoustic Effects
    Autorzy:
    Wszołek, T.
    Kłaczyński, M.
    Mleczko, D.
    Ozga, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1197516.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.58.+z
    43.66.Lj
    87.50.Y-
    Opis:
    The paper deals with difficulties that are encountered by investors and decision-making authorities in the course of investment processes involving construction of wind power plants. Moreover, attention is focused on absence of standardized procedures that could be used to determine environmental impact of wind turbines, mainly in the scope of acoustic effects appearing in conditions typical for operation of such devices (strong wind), high elevation of related noise sources, and the nature of the sound emission (tonality and amplitude modulation). Lack of such procedures is a source of serious ambiguities developing in assessment of all investment stages - planning and forecasting, construction, and operation. An additional problem arises in the case of power plants located in the vicinity of Natura 2000 area, where construction projects are often obstructed on the grounds of unclear criteria concerning, among other things, the effect of acoustic phenomena on birds, bats, and other animals. It follows from the research presented in this paper that the consistent system of procedures and criteria should be worked out on the grounds of long-term monitoring studies.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4A; A-38-A-44
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Vibroacoustic Environment Conditions on Functional Stability of Drivers
    Autorzy:
    Damijan, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537357.pdf
    Data publikacji:
    2010-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.40.-a
    43.80.-n
    43.80.-p
    87.50.Y-
    Opis:
    Despite new technological solutions and attempts to improve the working conditions during the operation of vehicles, city bus drivers are still exposed to negative impacts of noise and vibrations. This research project was undertaken in response to the lack of holistic analyses of the environmental factors that might impact on the city bus drivers at work. No extensive major research was done to investigate the influence of the conditions at work on functional stability of bus drivers and basic physiological parameters of the human body (systolic and diastolic pressure, pulse rate, temperature in the ear channel, loading of postural muscles, blood circulation determined with the use of a thermovision camera, fatty tissue content, body mass and physical condition (squeezing and pressing exercises). the main purpose of this research program was to show the impacts that the conditions at work might have on bus drivers or to demonstrate that these impacts do no exist.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 1; 23-26
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of General Low Frequency Vibration on Posture Stability
    Autorzy:
    Damijan, Z.
    Uhryński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490372.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.40.-a
    07.10.-h
    46.32.+x
    87.50.Y-
    Opis:
    The work presents the research and analysis concerning general low frequency vibration and its influence on posture stability. The research was conducted in two phases: a group exposed to vibration - August 2006, a control group: November 2006 in Krynica-Zdrój. An exposed group (29 participants/took part in 19 training sessions, each lasting 20 min, of low frequency vibration, standing position) applied to each participant at fixed time of the day. The low frequency vibration amplitude was 4 mm, while the frequency was 3.5 Hz. Before and after the session the posturographic examination of posture stability was conducted. The control group (33 participants) also took part in 19 everyday 20 min sessions with no vibrations and only measurements conducted. The results were analyzed concerning statistics using Statistica. For the sake of the analysis the significance level was p = 0.05, the parametric t-test and the nonparametric Kolmogorov-Smirnov tests were used for two groups of independent variables. Having conducted the research and analysis, one can state that 20 min exposure to low frequency vibration results in significant changes in posture stability and 19 day long vibration training changes significantly the posture stability among the participants. The observed changes were of positive nature. The work introduces research on the possibility of using low-frequency vibration to improve human stability. The results presented concern biophysics in rehabilitation of posture stability and are not often met in specialist literature.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1A; A-028-A-031
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Magnetosomes After Exposure to the Effect of the Sonication and Ultracentrifugation
    Autorzy:
    Molčan, M.
    Hashim, A.
    Kováč, J.
    Rajňák, M.
    Kopčanský, P.
    Makowski, M.
    Gojzewski, H.
    Molokáč, M.
    Hvizdák, L.
    Timko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368025.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    75.60.-d
    87.50.Y-
    68.37.-d
    Opis:
    Magnetosomes are intracellular organelles of widespread aquatic microorganisms called Magnetotactic bacteria. At present they are under investigation especially in biomedical applications. This ability depends on the presence of intracellular magnetosomes which are composed of two parts: first, nanometer-sized magnetite $(Fe_{3}O_{4})$ or greigite $(Fe_{3}S_{4})$ crystals (magnetosome crystal), depending on the bacterial species; and second, the bilayer membrane surrounding the crystal (magnetosome membrane). The magnetosomes were prepared by biomineralization process of magnetotactic bacteria Magnetospirillum Magnetotacticum sp. AMB-1. The isolated magnetosome chains (sample M) were centrifugated at speed of 100000 rpm for 4 hours (sample UM) and sonicated at power of 120 W for 3 hours (sample SM), respectively. The prepared suspensions were investigated with respect to morphological, structural and magnetic properties. The results from scanning electron microscopy showed that isolated chains of magnetosomes were partially broken to smaller ones after ultracentrifugation. On the other hand the application of the sonication process caused the formation of individual magnetosomes (unordered in chain). These results were confirmed by coercivity and magnetization saturation measurements.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 198-199
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Vibroacoustic Climate on Driver's Postural Stability for Eyes Closed in Driver's Cabin
    Autorzy:
    Damijan, Z.
    Skrzyniarz, S.
    Kwaśniewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1504430.pdf
    Data publikacji:
    2011-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.40.-a
    07.10.-h
    46.32.+x
    87.50.Y-
    Opis:
    Several levels of the nervous system are responsible for stability of the vertical position in humans. Three basic inputs are involved: atrial, visual and proprioceptive as well as mechanoreceptors present in the skin. Signals from these inputs control the body posture and its orientation with respect to internal and external reference systems. External systems are formed based on the gravitation field and visual stimuli. Internal systems are generated in the central nervous system by polymodal representations, also referred to as body schema. Some of environmental factors of driver's work place could disturb postural stability. Almost all vehicles are according with actual norms and directives. We investigate how normal week of work has impact on postural stability in new city buses. We concentrate on postural stability for closed eyes. In this paper results of investigation were presented.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 6A; 1073-1076
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasonic Methods of the Cells Separation in Human Blood
    Autorzy:
    Włoch, A.
    Czyż, H.
    Jasiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402588.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.35.+d
    47.35.Rs
    62.60.+v
    83.80.Hj
    87.50.Y-
    Opis:
    This work deals with the problem of ultrasound in the context of biomedical and clinical applications. Ultrasonic waves can be used for the separation of cells in human blood. Under the influence of ultrasonic waves cells included in the liquid experience a certain characteristic displacement was referred to as drift. Presented work suggests that only radiation pressure should be taken into account as a mechanism of drifting in this situation. It has been demonstrated that the growth of cells concentration around the points of stable equilibrium is exponential. The time constant of this growth was estimated and the formulae which determine the time needed to obtain the assumed concentration increase have been derived. The theoretical studies of acoustic agglomeration of particles in the liquid have become a new focus in the ultrasonic research.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2; 234-236
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quietness in the Soundscape of the Białowieża National Park
    Autorzy:
    Wiciak, J.
    Mleczko, D.
    Ozga, A.
    Wszołek, G.
    Wierzbicki, J.
    Piechowicz, J.
    Małecki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402187.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.66.-x
    43.66.+y
    87.18.Tt
    87.19.lc
    43.50.Rq
    Opis:
    The quietness, defined as the near or complete absence of sound, in the context of the natural environment protection, may be considered a state in which no undesired of foreign sounds occur, and, by analogy to noise, analyzed in two aspects: that pertaining to measurements and the subjective one. The article discusses the lowest levels of sounds recorded at night in the soundscape of the Białowieża Forest. Due to low levels of the examined sounds and the technical problems that occurred while the sounds were being measured and registered, the acoustic examination of the measurement set-up in an anechoic chamber has also been presented. The research is aimed at defining precisely the concept of quietness prevailing in the nature in the subjective aspect by determining both the range of levels and the characteristics of preferred sounds.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1A; A-79-A-84
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Resonance Imaging at Low Magnetic Field Using Hyperpolarized $\text{}^{3}$He Gas
    Autorzy:
    Suchanek, M.
    Cieślar, K.
    Pałasz, T.
    Suchanek, K.
    Dohnalik, T.
    Olejniczak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042109.pdf
    Data publikacji:
    2005-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.80.Bx
    67.65.+z
    75.50.-y
    87.61.-c
    Opis:
    A low magnetic field magnetic resonance imaging system for small animal lung imaging using hyperpolarized $\text{}^{3}$He gas is presented. The hyperpolarized $\text{}^{3}$He gas at 1 mbar pressure and 30% polarization is obtained by the metastability exchange optical pumping technique. The magnetic resonance imaging unit is based on a permanent magnet of open geometry, built from a new generation Nd-B-Fe magnetic material. It produces the magnetic field of 88 mT with homogeneity better than 50 ppm in the 10 cm diameter sphere, after application of passive shimming. The magnetic field gradients of 30 mT/m are generated by a set of biplanar, actively shielded gradient coils. The first $\text{}^{1}$H images of various biological objects, as well as $\text{}^{3}$He images of the rat lung in vivo obtained in the described system are shown. In terms of sensitivity and resolution, the technique is superior to conventional $\text{}^{1}$H magnetic resonance imaging, and offers great possibilities in early diagnosis of lung diseases.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 3; 491-506
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Structure and Heat Generation in the Co-Precipitated Magnetite Nanoparticles
    Autorzy:
    Pawlik, P.
    Pruba, M.
    Pawlik, K.
    Kotynia, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030238.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    78.67.Bf
    78.70.Ck
    76.80.+y
    87.50.S-
    Opis:
    In the present studies the phase structure and magnetic ordering of magnetite nanoparticles were investigated. The powder samples were obtained by co-precipitation from Fe(III) and Fe(II) salts. SiO₂ coating was performed using the modified Stöber process. X-ray diffraction studies revealed presence of the only one Fe₃O₄ crystalline phase both for the non-coated and SiO₂-coated samples. The Mössbauer studies have shown differences in shapes of measured spectral lines for Fe₃O₄ particles subjected to the Stöber process and non-coated particles. The heating efficiency was measured for glycerol dispersed nanoparticles. The analysis have shown changes in specific loss power depending on the concentration of the nanoparticles and amplitude of alternating magnetic field.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1217-1221
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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