Temat: signal loss - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Investigating the filling state of OSL detector traps with the optical sampling method
Autorzy:: Mandowska, Ewa
Smyka, Robert
Mandowski, Arkadiusz
Powiązania:: https://bibliotekanauki.pl/articles/2106412.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: optically stimulated luminescence
OSL
ionizing radiation detectors
radiative recombination
signal loss
Opis:: Optically stimulated luminescence (OSL) and thermoluminescence (TL) methods are commonly used in dosimetry of ionizing radiation and dating of archaeological and geological objects. A typical disadvantage of OSL detectors is signal loss over a longer time scale. In this article, we present a method of studying this phenomenon as well as monitoring the state of the detector by means of optical sampling. The method was used to determine the OSL signal loss (fading) characteristics of selected potassium feldspars.
Źródło:: Metrology and Measurement Systems; 2022, 29, 2; 361--371
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Sensor Hop-based Energy Efficient Networking Approach for Routing in Underwater Acoustic Communication
Autorzy:: Kohli, S.
Bhattacharya, P. P.
Powiązania:: https://bibliotekanauki.pl/articles/309397.pdf
Data publikacji:: 2017
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: attenuation
clustering
multi-hop routing
signal-to-noise ratio
transmission loss
Opis:: Underwater Wireless Sensor Networks are deployed to explore the world under the water, measure different parameters and communicate the data to the surface, in the widespread applications. The main operating technology of these networks is the acoustic communication. The communication among the sensors and finally to the surface station requires a routing protocol. The sensors being battery limited and unfeasible to be replaced under the water requires an energy efficient routing protocol. Clustering imparted in routing is an energy saving technique in sensor networks. The routing may involve single or multi hop communication in the sensor networks. The paper gives a comparative study of the benchmark protocol multi-hop LEACH with the proposed Sensor Hop-based Energy Efficient Networking Approach (SHEENA) for the shallow as well as deep water in three dimensional Underwater Wireless Sensor Networks. The network energy model for the Underwater Wireless Sensor Networks is based among the different acoustic channel characteristics. The proposed approach is found to give better response.
Źródło:: Journal of Telecommunications and Information Technology; 2017, 1; 44-49
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Tinnitus Therapy Based on High-Frequency Linearization Principles - Preliminary Results
Autorzy:: Poremski, T.
Kostek, B.
Powiązania:: https://bibliotekanauki.pl/articles/177726.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: tinnitus
sensorineural hearing loss
tinnitus masking
Tinnitus Retraining Therapy (TRT)
signal quantization
dithering technique
high-frequency linearization
ultrasound dither noise
Opis:: The aim of this work is to present problems related to tinnitus symptoms, its pathogenesis, hypothe- ses on tinnitus causes, and therapy treatment to reduce or mask the phantom noise. In addition, the hypothesis on the existence of parasitic quantization that accompanies hearing loss has been recalled. Moreover, the paper describes a study carried out by the Authors with the application of high-frequency dither having specially formed spectral characteristics. Discussion on preliminary results obtained and conclusions are also contained.
Źródło:: Archives of Acoustics; 2012, 37, 2; 161-170
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Signal Recognition and Hearing Protectors With Normal and Impaired Hearing
Autorzy:: Lazarus, H.
Powiązania:: https://bibliotekanauki.pl/articles/89728.pdf
Data publikacji:: 2005
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: hearing protector
muff
plug
hearing loss
hearing performance
masked threshold
signal identification
wkładki przeciwhałasowe
nauszniki przeciwhałasowe
hałas
ochrona przed hałasem
Opis:: Recognition of acoustic signals when perception is subject to interference from noise has already been extensively studied. In this study the influence of hearing protectors (HP) (plugs, muffs) and hearing loss on signal recognition is examined. Different spectrums and levels of the noise are also included. The test results are shown as the masked threshold for the signals heard and identified. In the case of normally hearing subjects a frequency-independent HP (plug) improves hearing performance, while frequency-dependent HP (muffs) tends to worsen it, especially with low-frequency noise. Hearing losses even worsen hearing performance when plugs are worn. Design suggestions are made to optimise signal recognition. Minimum signal-to-noise ratio and the use of HP are discussed.
Źródło:: International Journal of Occupational Safety and Ergonomics; 2005, 11, 3; 233-250
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Frequency and time constrained digital filter design
Autorzy:: Henzel, N.
Powiązania:: https://bibliotekanauki.pl/articles/333518.pdf
Data publikacji:: 2006
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: projektowanie filtrów cyfrowych
redukcja szumów sygnału biomedycznego
ε-nieczuła funkcja straty
digital filter design
biomedical signal noise reduction
ε-insensitive loss function
Opis:: This paper describes a new method for linear phase finite impulse response (FIR) filters design. This new approach, based on the ε-insensitive loss function, allows the design process to take into account not only constraints specified in the frequency domain, but also constraints on the output, time domain, signal. The performances of the proposed approach are shortly illustrated by a high-pass filter for ECG baseline wander reduction.
Źródło:: Journal of Medical Informatics & Technologies; 2006, 10; 103-112
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Applications and Comparison of Continuous Wavelet Transforms on Analysis of A-wave Impulse Noise
Autorzy:: Qin, J.
Sun, P.
Powiązania:: https://bibliotekanauki.pl/articles/177117.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: continuous wavelet transform (CWT)
impulse noise signal processing
time-frequency domain
temporal and spectral resolutions
noise-induced hearing loss
A-wave impulse noise
Opis:: Noise induced hearing loss (NIHL) is a serious occupational related health problem worldwide. The A-wave impulse noise could cause severe hearing loss, and characteristics of such kind of impulse noise in the joint time-frequency (T-F) domain are critical for evaluation of auditory hazard level. This study focuses on the analysis of A-wave impulse noise in the T-F domain using continual wavelet transforms. Three different wavelets, referring to Morlet, Mexican hat, and Meyer wavelets, were investigated and compared based on theoretical analysis and applications to experimental generated A-wave impulse noise signals. The underlying theory of continuous wavelet transform was given and the temporal and spectral resolutions were theoretically analyzed. The main results showed that the Mexican hat wavelet demonstrated significant advantages over the Morlet and Meyer wavelets for the characterization and analysis of the A-wave impulse noise. The results of this study provide useful information for applying wavelet transform on signal processing of the A-wave impulse noise.
Źródło:: Archives of Acoustics; 2015, 40, 4; 503-512
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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