In the paper the results of research on a multifunctional graphene-based biosensor are presented.... more In the paper the results of research on a multifunctional graphene-based biosensor are presented. Project of a mobile device is described for Point-of-Care (PoC) diagnostic tests based on Electrochemical Impedance Spectroscopy (EIS) and Bioelectrical Impedance (BI) technique, using integrated impedance scanner AD5933 (Analog Devices). Design of a biosensing electrode, a control circuit based on XMEGA microprocessor, and results of preliminary experiments and simulations are also presented.
To determine parameters of the pattern electroretinogram (PERG) waveforms in the continuous wavel... more To determine parameters of the pattern electroretinogram (PERG) waveforms in the continuous wavelet transform (CWT) coefficients domain important in more precise clinical assessment of the recordings. 102 normal PERG recordings were studied in two age groups (< or = 50 years, > 50 years). Continuous wavelet transform analysis was performed using the MatLab 7.0 software. Various wavelets were used in the experiments. Mother wavelets selection was optimized with the criterion based on minimal scatter of the results for normal PERG waveforms. Comparison with traditional, time-domain based analysis showed that determining the PERG parameters in CWT domain was achieved with better accuracy. Normal values for the test showed much less scatter. It was shown on some clinical examples (glaucomatous patients) that the sensitivity of the test was improved. The CWT-based method of the PERG signal analysis is useful in clinical differentiation between normal and abnormal waveforms, particu...
This study investigates acoustic properties of the Polish retroflex and alveolo-palatal fricative... more This study investigates acoustic properties of the Polish retroflex and alveolo-palatal fricatives and affricates /ʂ/, /ʈ͡ ʂ/, /ɕ/ and /t͡ ɕ/. The sibilants were produced in (i) yes/no questions with rising intonation and (ii) answers with falling intonation. Multitaper spectra were used to compare the two places of articulation. Results show that the Centre of Gravity (COG) did not differentiate retroflexes from alveolo-palatals in the question condition. The same consonants, however, display significantly different COG values if they are produced in the statement condition. Other spectral measurements (highest spectral peak, standard deviation, kurtosis) were also significantly different with regard to the two places of articulation and intonation types. The results indicate that special attention should be given to intonational differences when acoustic properties of sibilants are investigated.
The overall goal of the paper is to contribute to a better understanding of segment-prosody inter... more The overall goal of the paper is to contribute to a better understanding of segment-prosody interaction in different speech modes. In particular, the paper shows that depending on intonation patterns, utterance-final voiceless fricatives in Polish show different properties. In polar questions with rising intonation, the frequency of the highest spectral peak is higher than in statements produced with falling intonation. Voiceless fricatives in questions display higher Centre of Gravity accompanied by higher standard deviation. Furthermore, the fricatives are produced with higher mean intensities in questions than statements. Differences in fricatives are more pronounced when the sentences are whispered. For instance, in contrast to normal speech where skewness and kurtosis do not show differences, in whispered speech both spectral moments display lower values in statements than in questions. In addition, spectral slopes (m1, m2) are steeper in questions than in statements. In summar...
This paper examines acoustic correlates of intonation in Polish whispered, semi-whispered and nor... more This paper examines acoustic correlates of intonation in Polish whispered, semi-whispered and normal speech modes. In particular, it investigates correlates of utterance-final rising intonation in polar questions and falling intonation in statements. The paper examines not only properties of vowels but also properties of the following voiceless consonant clusters. The study is based on measurements of 4608 sibilants (fricatives and affricates) produced by 16 native speakers of Polish. The results point to differences in spectral properties of both utterance-final vowels and consonants where falling intonation in statements contrasts with rising intonation in polar questions. Regarding the consonants, both fricatives and affricates are produced with higher spectral peaks, higher intensity and higher COG and STD values in questions than in statements. Skewness and kurtosis values are lower in questions than in statements. Some spectral differences of sibilants, including spectral slop...
Two Polish melodies were investigated, the vocative chant used to call someone for a routine reas... more Two Polish melodies were investigated, the vocative chant used to call someone for a routine reason, and the scolding melody conveying disapproval of the addressee or her actions. Three repetitions of 12 Polish names (1-4 syllables long, 3 names per syllable count) were elicited from 16 speakers using a Discourse Completion Task. The results, based on 11 speakers, show that the vocative chant consists of a low plateau followed by a rise-fall-rise; the scolding melody is a simple rise-fall. Systematic differences were found in the scaling and alignment of tonal targets: the vocative chant showed late alignment of the accentual pitch peak and overall lower scaling of targets. The accented vowel was also affected, being longer but having lower RMS in the vocative chant. Based on the data and comparisons with other melodies, we analyze the vocative chant as LH* !H-H% and the scolding melody as H* L%.
In the paper the results of research on a multifunctional graphene-based biosensor are presented.... more In the paper the results of research on a multifunctional graphene-based biosensor are presented. Project of a mobile device is described for Point-of-Care (PoC) diagnostic tests based on Electrochemical Impedance Spectroscopy (EIS) and Bioelectrical Impedance (BI) technique, using integrated impedance scanner AD5933 (Analog Devices). Design of a biosensing electrode, a control circuit based on XMEGA microprocessor, and results of preliminary experiments and simulations are also presented.
In the paper the results of research on electronic measurement and control systems designed for
... more In the paper the results of research on electronic measurement and control systems designed for
a multifunctional graphene-based biosensor are presented. Design of different types of biosensing electrodes and work on electronic circuits based on two microcontroller platforms are discussed. Comparison of measurement results using both systems in electrochemical biosensing techniques (EIS - Electrochemical Impedance Spectroscopy) is also presented.
In the paper the results of research on a multifunctional graphene-based biosensor are presented.... more In the paper the results of research on a multifunctional graphene-based biosensor are presented.
Project of a mobile device is described for Point-of-Care (PoC) diagnostic tests based on Electrochemical Impedance Spectroscopy (EIS) and Bioelectrical Impedance (BI) technique, using integrated impedance scanner AD5933 (Analog Devices). Design of a biosensing electrode, a control circuit based on XMEGA microprocessor, and results of preliminary experiments and simulations are also presented.
In the paper the results of research on a multifunctional graphene-based biosensor are presented.... more In the paper the results of research on a multifunctional graphene-based biosensor are presented. Project of a mobile device is described for Point-of-Care (PoC) diagnostic tests based on Electrochemical Impedance Spectroscopy (EIS) and Bioelectrical Impedance (BI) technique, using integrated impedance scanner AD5933 (Analog Devices). Design of a biosensing electrode, a control circuit based on XMEGA microprocessor, and results of preliminary experiments and simulations are also presented.
To determine parameters of the pattern electroretinogram (PERG) waveforms in the continuous wavel... more To determine parameters of the pattern electroretinogram (PERG) waveforms in the continuous wavelet transform (CWT) coefficients domain important in more precise clinical assessment of the recordings. 102 normal PERG recordings were studied in two age groups (< or = 50 years, > 50 years). Continuous wavelet transform analysis was performed using the MatLab 7.0 software. Various wavelets were used in the experiments. Mother wavelets selection was optimized with the criterion based on minimal scatter of the results for normal PERG waveforms. Comparison with traditional, time-domain based analysis showed that determining the PERG parameters in CWT domain was achieved with better accuracy. Normal values for the test showed much less scatter. It was shown on some clinical examples (glaucomatous patients) that the sensitivity of the test was improved. The CWT-based method of the PERG signal analysis is useful in clinical differentiation between normal and abnormal waveforms, particu...
This study investigates acoustic properties of the Polish retroflex and alveolo-palatal fricative... more This study investigates acoustic properties of the Polish retroflex and alveolo-palatal fricatives and affricates /ʂ/, /ʈ͡ ʂ/, /ɕ/ and /t͡ ɕ/. The sibilants were produced in (i) yes/no questions with rising intonation and (ii) answers with falling intonation. Multitaper spectra were used to compare the two places of articulation. Results show that the Centre of Gravity (COG) did not differentiate retroflexes from alveolo-palatals in the question condition. The same consonants, however, display significantly different COG values if they are produced in the statement condition. Other spectral measurements (highest spectral peak, standard deviation, kurtosis) were also significantly different with regard to the two places of articulation and intonation types. The results indicate that special attention should be given to intonational differences when acoustic properties of sibilants are investigated.
The overall goal of the paper is to contribute to a better understanding of segment-prosody inter... more The overall goal of the paper is to contribute to a better understanding of segment-prosody interaction in different speech modes. In particular, the paper shows that depending on intonation patterns, utterance-final voiceless fricatives in Polish show different properties. In polar questions with rising intonation, the frequency of the highest spectral peak is higher than in statements produced with falling intonation. Voiceless fricatives in questions display higher Centre of Gravity accompanied by higher standard deviation. Furthermore, the fricatives are produced with higher mean intensities in questions than statements. Differences in fricatives are more pronounced when the sentences are whispered. For instance, in contrast to normal speech where skewness and kurtosis do not show differences, in whispered speech both spectral moments display lower values in statements than in questions. In addition, spectral slopes (m1, m2) are steeper in questions than in statements. In summar...
This paper examines acoustic correlates of intonation in Polish whispered, semi-whispered and nor... more This paper examines acoustic correlates of intonation in Polish whispered, semi-whispered and normal speech modes. In particular, it investigates correlates of utterance-final rising intonation in polar questions and falling intonation in statements. The paper examines not only properties of vowels but also properties of the following voiceless consonant clusters. The study is based on measurements of 4608 sibilants (fricatives and affricates) produced by 16 native speakers of Polish. The results point to differences in spectral properties of both utterance-final vowels and consonants where falling intonation in statements contrasts with rising intonation in polar questions. Regarding the consonants, both fricatives and affricates are produced with higher spectral peaks, higher intensity and higher COG and STD values in questions than in statements. Skewness and kurtosis values are lower in questions than in statements. Some spectral differences of sibilants, including spectral slop...
Two Polish melodies were investigated, the vocative chant used to call someone for a routine reas... more Two Polish melodies were investigated, the vocative chant used to call someone for a routine reason, and the scolding melody conveying disapproval of the addressee or her actions. Three repetitions of 12 Polish names (1-4 syllables long, 3 names per syllable count) were elicited from 16 speakers using a Discourse Completion Task. The results, based on 11 speakers, show that the vocative chant consists of a low plateau followed by a rise-fall-rise; the scolding melody is a simple rise-fall. Systematic differences were found in the scaling and alignment of tonal targets: the vocative chant showed late alignment of the accentual pitch peak and overall lower scaling of targets. The accented vowel was also affected, being longer but having lower RMS in the vocative chant. Based on the data and comparisons with other melodies, we analyze the vocative chant as LH* !H-H% and the scolding melody as H* L%.
In the paper the results of research on a multifunctional graphene-based biosensor are presented.... more In the paper the results of research on a multifunctional graphene-based biosensor are presented. Project of a mobile device is described for Point-of-Care (PoC) diagnostic tests based on Electrochemical Impedance Spectroscopy (EIS) and Bioelectrical Impedance (BI) technique, using integrated impedance scanner AD5933 (Analog Devices). Design of a biosensing electrode, a control circuit based on XMEGA microprocessor, and results of preliminary experiments and simulations are also presented.
In the paper the results of research on electronic measurement and control systems designed for
... more In the paper the results of research on electronic measurement and control systems designed for
a multifunctional graphene-based biosensor are presented. Design of different types of biosensing electrodes and work on electronic circuits based on two microcontroller platforms are discussed. Comparison of measurement results using both systems in electrochemical biosensing techniques (EIS - Electrochemical Impedance Spectroscopy) is also presented.
In the paper the results of research on a multifunctional graphene-based biosensor are presented.... more In the paper the results of research on a multifunctional graphene-based biosensor are presented.
Project of a mobile device is described for Point-of-Care (PoC) diagnostic tests based on Electrochemical Impedance Spectroscopy (EIS) and Bioelectrical Impedance (BI) technique, using integrated impedance scanner AD5933 (Analog Devices). Design of a biosensing electrode, a control circuit based on XMEGA microprocessor, and results of preliminary experiments and simulations are also presented.
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a multifunctional graphene-based biosensor are presented. Design of different types of biosensing electrodes and work on electronic circuits based on two microcontroller platforms are discussed. Comparison of measurement results using both systems in electrochemical biosensing techniques (EIS - Electrochemical Impedance Spectroscopy) is also presented.
Project of a mobile device is described for Point-of-Care (PoC) diagnostic tests based on Electrochemical Impedance Spectroscopy (EIS) and Bioelectrical Impedance (BI) technique, using integrated impedance scanner AD5933 (Analog Devices). Design of a biosensing electrode, a control circuit based on XMEGA microprocessor, and results of preliminary experiments and simulations are also presented.
a multifunctional graphene-based biosensor are presented. Design of different types of biosensing electrodes and work on electronic circuits based on two microcontroller platforms are discussed. Comparison of measurement results using both systems in electrochemical biosensing techniques (EIS - Electrochemical Impedance Spectroscopy) is also presented.
Project of a mobile device is described for Point-of-Care (PoC) diagnostic tests based on Electrochemical Impedance Spectroscopy (EIS) and Bioelectrical Impedance (BI) technique, using integrated impedance scanner AD5933 (Analog Devices). Design of a biosensing electrode, a control circuit based on XMEGA microprocessor, and results of preliminary experiments and simulations are also presented.