270,774 research outputs found
COLM ESTRIDGE Baritone MASTER'S RECITAL Thursday, April 28, 2005 8:00 p.m. Lillian H. Duncan Recital Hail
No full textPlaylist: Tre Ariette / Vincenzo Bellini (1801-1835) -- Loveliest of trees / George Butterworth (1885-1916) -- When I was one-and-twenty / George Butterworth (1885-1916) -- Look not in my eyes / George Butterworth (1885-1916) -- Think no more, lad / George Butterworth (1885-1916) -- The lads in their hundres / George Butterworth (1885-1916) -- Is my team loughing / George Butterworth (1885-1916) -- A Chloris / Reynaldo Hahn (1875-1947) -- Quand je fus pris au pavillion / Reynaldo Hahn (1875-1947) -- Infidelité / Reynaldo Hahn (1875-1947) -- Schäfers Klagelied, D.121 / Franz Schubert (1797-1828) -- An die Leier, D.737 / Franz Schubert (1797-1828) -- Der Musensohn, D.764 / Franz Schubert (1797-1828).This recital is given in partial fulfillment of the requirements for Master of Music degree
Extending the Concept of Analog Butterworth Filter for Fractional Order Systems
No full textThis is the author accepted manuscript. The final version is available from Elsevier via the DOI in this record.This paper proposes the design of Fractional Order (FO) Butterworth filter in complex w-plane (w=sq; q being any real number) considering the presence of under-damped, hyper-damped, ultra-damped poles. This is the first attempt to design such fractional Butterworth filters in complex w-plane instead of complex s-plane, as conventionally done for integer order filters. Firstly, the concept of fractional derivatives and w-plane stability of linear fractional order systems are discussed. Detailed mathematical formulation for the design of fractional Butterworth-like filter (FBWF) in w-plane is then presented. Simulation examples are given along with a practical example to design the FO Butterworth filter with given specifications in frequency domain to show the practicability of the proposed formulation
Design of Matching Layers for Increasing the Electrical Field Penetration inside Human Tissue
No full textThe interaction of electromagnetic fields with human tissues is of great interest for a wide range of applications spanning from medical treatments to sport activity tracking. In several cases the penetration of the electric field inside body is a key factor for the successful design of wearable devices. The multilayered structure of the tissue and the complex permittivity of its components pose numerous challenges to the propagation of the electric field which will be addressed in this work with the aim of providing guidelines for the design of a matching layer able to enhance the field penetration
Vocalisation sound pattern identification in young broiler chickens
No full textIn this study, we describe the monitoring of young broiler chicken vocalisation, with sound recorded and assessed at regular intervals throughout the life of the birds from day 1 to day 38, with a focus on the first week of life. We assess whether there are recognisable, and even predictable, vocalisation patterns based on frequency and sound spectrum analysis, which can be observed in birds at different ages and stages of growth within the relatively short life of the birds in commercial broiler production cycles. The experimental trials were carried out in a farm where the broiler where reared indoor, and audio recording procedures carried out over 38 days. The recordings were made using two microphones connected to a digital recorder, and the sonic data was collected in situations without disturbance of the animals beyond that created by the routine activities of the farmer. Digital files of 1 h duration were cut into short files of 10 min duration, and these sound recordings were analysed and labelled using audio analysis software. Analysis of these short sound files showed that the key vocalisation frequency and patterns changed in relation to increasing age and the weight of the broilers. Statistical analysis showed a significant correlation (P<0.001) between the frequency of vocalisation and the age of the birds. Based on the identification of specific frequencies of the sounds emitted, in relation to age and weight, it is proposed that there is potential for audio monitoring and comparison with ‘anticipated’ sound patterns to be used to evaluate the status of farmed broiler chicken
The use of vocalisation sounds to assess responses of broiler chicken to environmental variables
No full textThe vocalisation sounds of broiler chicken have been studied previously; however, in this study we describe the monitoring of broiler chicken vocalisation under normal farm conditions, with sound recorded and assessed at regular intervals throughout the life of the bird from day 1 to day 37 to assess whether recognisable, and even predictable, vocalisation patterns, based on frequency and bandwidth analysis, are evident in birds at different ages and stages of growth within commercial broiler production timescales. Two experimental trials were carried out in a ‘conventional’ indoor reared broiler farm, and the audio recording procedures lasted for 38 days. The recordings were made at regular intervals with the equipment in the same position inside the broiler house during each period of data collection. The recordings were made automatically, without the presence of human operators, using a professional hand-held solid state recorder (Marantz PMD 661 MK II) and provided sound recordings which represented situations without disturbance of the birds beyond that created by the farmer. Digital files of one hour duration were cut into short files of 10 minutes duration, and these sound recordings were analysed and labelled using analysis software: Adobe Audition CS6. Analysis of the sounds recorded, using audio software, identified that the sounds and the related frequencies changed in relation to increasing age and the weight of the broilers. Statistical analysis (Proc CORR, SAS) showed a significant correlation (P<0.001) between the frequency of vocalisation and the age and behaviour of the birds. This method, based on identification of specific frequencies of the sounds emitted compared with age and weight could potentially be used in a system to evaluate the health and welfare status of birds at farm level
Butterworth 4th order LP filter
No full textTema završnog rada bila je realizacija aktivne niskopropusne filtarske sekcije 4. reda s
aproksimacijom po Butterworthu. Preko zadane prijenosne funkcije filtra, dobio se
matematički model te analitički izrazi i grafovi za raspored nula i polova, amplitudnofrekvencijske karakteristike, fazno-frekvencijske karakteristike, grupnog kašnjenja i
vremenskih odziva. Zatim, određivali smo parametre filtra te elemente realizacije. Zadani filtar,
denorminirali smo na graničnu frekvenciju od 1 kHz te smo ponovili sve prethodne postupke.
Za provjeru točnosti realizacije, koristili smo program LTspice uspoređujući dobivene grafove.The theme of this thesis is realization of the active low pass filter of the 4th order. Filter is
given with approximation by Butterworth. Mathematical model and graphs for zero/pole
assignments, amplitude-frequency characteristic, phase-frequency characteristic, time
response and group delay were given from 4th order filtering function of Butterworth. Using
filtering function of Butterworth, we calculated filter parameters and elements of the
realization. However, as we wanted a 1kHz bandwith filter, we denorm the filter and repeat all
procedures we mentioned above. To check our accuracy of the calculation, we used LTspice
program. Graphs obtained in MATLAB we compared with graphs obtained in LTspice
ANALISIS PERBANDINGAN PERFORMANSI FILTER BUTTERWORTH DAN CHEBYSHEV TYPE-I PADA PENGIRIMAN KANAL AWGN TERHADAP KUALITAS AUDIO
No full textPerkembangan teknologi audio menuntut kualitas suara yang semakin baik di tengah lingkungan yang penuh gangguan noise. Keberadaan noise pada sinyal audio dapat menyebabkan ketidaknyamanandan mengganggu persepsi serta kenyamanan pendengar dalam aktivitas sehari-hari. Salah satu solusi untuk meningkatkan kualitas audio adalah dengan menerapkan filter digital, khususnya low-pass filter, guna mereduksi noise pada sinyal audio. Penelitian ini membandingkan performansi dua jenis filter, yaitu Butterworth dan Chebyshev Type-I, pada pengiriman kanal AWGN terhadap kualitas audio. Pengujian dilakukan dengan menambahkan noise pada sinyal audio, lalu memfilter menggunakan kedua jenis filter pada frekuensi cutoff 4 kHz dan 10 kHz. Evaluasi performa dilakukan menggunakan parameter Mean Squared Error dan persepsi kualitas sinyal dengan parameter Subjective Difference Grade. Hasil penelitian menunjukkan bahwa filter Butterworth secara konsisten menghasilkan nilai MSE yang lebih kecil yang lebih baik dibandingkan Chebyshev Type-I pada berbagai kondisi SNR dan frekuensi cutoff. Dengan demikian, filter Butterworth terbukti lebih unggul dalam mereduksi noise dan mempertahankan kualitas sinyal audio pada skenario pengiriman kanal AWGN.
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The advancement of audio technology demands increasingly better sound quality in noisy environments. The presence of noise in an audio signal can cause discomfort and interfere with the listener's perception and comfort in daily activities. One solution to improve audio quality is the application of digital filters, specifically low-pass filters, to reduce noise in the audio signal. This research compares the performance of two types of filters, Butterworth and Chebyshev Type-I, on audio quality when transmitted through an AWGN (Additive White Gaussian Noise) channel. The testing was conducted by adding noise to an audio signal, which was then filtered using both filter types at cutoff frequencies of 4 kHz and 10 kHz.Performance evaluation was carried out using the Mean Squared Error parameter and perceived signal quality with the Subjective Difference Grade parameter. The results showed that the Butterworth filter consistently produced a lower (better) MSE value compared to the Chebyshev Type-I filter under various SNR (Signal-to-Noise Ratio) conditions and cutoff frequencies. Therefore, the Butterworth filter proved to be superior in reducing noise and maintaining audio signal quality in the AWGN channel transmission scenario
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Projeto de filtros transicionais baseados em aproximações polinomiais clássicas /
No full textDissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico.Este trabalho propõe uma metodologia de projeto de filtros transicionais passa-baixas que usam seis aproximações clássicas bem conhecidas de filtros polinomiais (Chebyshev, Legendre, Butterworth, Bessel, Gauss e Multiplicidade-n). O projeto leva em conta um gabarito, proporcionando um melhor compromisso entre a magnitude, fase e/ou resposta temporal. Com esta aproximação é possível projetar filtros que têm um desempenho melhor que aqueles projetados com funções polinomiais clássicas ou, mesmo, outros filtros transicionais propostos na literatura. São apresentados exemplos que demonstram os resultados e a eficiência do método proposto
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