Gotowe bibliografie tematyczne / Types of Noise

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Gotowa bibliografia na temat „Types of Noise”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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Artykuły w czasopismach na temat "Types of Noise"

Zayed, M. Ramadan. "Optimum Image Filters for Various Types of Noise." TELKOMNIKA Telecommunication, Computing, Electronics and Control 16, no. 5 (2018): 2458–64. https://doi.org/10.12928/TELKOMNIKA.v16i5.10508.

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In this paper, the quality performance of several filters in restoration of images corrupted with various types of noise has been examined extensively. In particular, Wiener filter, Gaussian filter, median filter and averaging (mean) filter have been used to reduce Gaussian noise, speckle noise, salt and pepper noise and Poisson noise. Many images have been tested, two of which are shown in this paper. Several percentages of noise corrupting the images have been examined in the simulations. The size of the sliding window is the same in the four filters used, namely 5x5 for all the indicated no

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Farshi, Taymaz Rahkar. "Image Noise Reduction Method Based on Compatibility with Adjacent Pixels." International Journal of Image and Graphics 17, no. 03 (2017): 1750014. http://dx.doi.org/10.1142/s0219467817500140.

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This paper proposes an efficient noise reduction method for gray and color images that are contaminated by salt-and-pepper noise. In the proposed method, the pixels that are more compatible with adjacent pixels are replaced with target (noisy) pixels. The algorithm is applied on noisy Lena and Mansion images that are contaminated by salt-and-pepper noise with 0.1 and 0.2 noise intensities. Although this method is developed for reducing noise from the images that are contaminated by salt-and-pepper noise, it can also reduce the noise from the images that are contaminated by other types of noise

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Ayrbabamyan, S. A., and E. A. Bugarev. "Types of noise barriers." Izvestiya MGTU MAMI 7, no. 1-4 (2013): 134–38. http://dx.doi.org/10.17816/2074-0530-67851.

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Liu, Ying, Deying Gu, Huiling Zhao, and Rong Yu. "Influence of Different Noise Types on Hearing Function in Patients Treated for Mild Otitis Media." Noise and Health 26, no. 121 (2024): 231–34. http://dx.doi.org/10.4103/nah.nah_6_24.

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Background: Otitis media (OM) refers to a common clinical ear disease. Noise seriously damages human hearing function. This study aimed to investigate the effects of various noise types on the hearing function of patients who have recovered from mild OM. Materials and Methods: A total of 160 patients with mild OM treated at our hospital from May 2020 to May 2023 were retrospectively selected for this study. Based on clinical data, the patients were divided into the non-noise group (n = 80) and the noise (n = 80) group. The hearing thresholds of the two groups were compared across various noise

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Hecht, Markus, Thilo Hanisch, Anastasia Ullrich, et al. "Effects of Locomotive Noise Reduction to Freight Train Noise in Switzerland and Europe." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 8 (2023): 586–92. http://dx.doi.org/10.3397/in_2023_0097.

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As freight trains are very frequently operated at night there is still big concern about freight train noise in Europe. Freight wagons in Switzerland and Germany are now all equipped with composite brake blocks instead of cast iron brake blocks which results in significant noise reductions. Using data from the Swiss noise monitoring stations the contribution of different locomotives to the overall train noise was evaluated. For locomotive types without cast iron brake blocks the year of construction is not related to the noise behavior. Newer types are not in general less noisy than old ones.

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C, Shraddha, Chayadevi M L, Anusuya M A, and Vani H Y. "Enhancing Noise Reduction with Bionic Wavelet and Adaptive Filtering." Inteligencia Artificial 27, no. 74 (2024): 214–26. http://dx.doi.org/10.4114/intartif.vol27iss74pp214-226.

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Speech signals often contain different forms of background and environmental noise. For the development of an efficient speech recognition system, it is essential to preprocess noisy speech signals to reduce the impact of these disturbances. Notably, prior research has paid limited attention to pink and babble noises. This gap in knowledge inspired us to develop and implement hybrid algorithms tailored to handle these specific noise types. We introduce a hybrid method that combines the Bionic Wavelet transform with Adaptive Filtering to enhance signal strength. The performance of this method i

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Nageswara Rao, S., K. Jaya Sankar, and C. D. Naidu. "An Improved Bi-Level Thresholding Based Uncertainty Evaluation for Speech Enhancement in Non-Stationary Noises." International Journal of Engineering & Technology 7, no. 2.24 (2018): 436. http://dx.doi.org/10.14419/ijet.v7i2.24.12130.

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This paper proposes a new speech enhancement framework to improve the quality of speeches recorded under adverse acoustic environments based on the speech presence uncertainty. Since the uncertainty evaluation gives a more and clear discrimination about the speech and noise, this paper proposes a new uncertainty evaluation mechanism as a preprocessing mechanism to the noise suppression methods. This mechanism relates with energies of a noisy speech signal and classifies the speech segments and noise segments more perfectly. In addition to the quality enhancement, this approach also reduces the

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Zhang, Lu, Mingjiang Wang, Qiquan Zhang, and Ming Liu. "Environmental Attention-Guided Branchy Neural Network for Speech Enhancement." Applied Sciences 10, no. 3 (2020): 1167. http://dx.doi.org/10.3390/app10031167.

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The performance of speech enhancement algorithms can be further improved by considering the application scenarios of speech products. In this paper, we propose an attention-based branchy neural network framework by incorporating the prior environmental information for noise reduction. In the whole denoising framework, first, an environment classification network is trained to distinguish the noise type of each noisy speech frame. Guided by this classification network, the denoising network gradually learns respective noise reduction abilities in different branches. Unlike most deep neural netw

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Rhebergen, Koenraad S., and Wouter A. Dreschler. "The extended speech reception threshold model: Predicting speech intelligibility in different types of non-stationary noise in hearing-impaired listeners." Journal of the Acoustical Society of America 157, no. 2 (2025): 1500–1511. https://doi.org/10.1121/10.0035833.

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The speech reception threshold (SRT) model of Plomp [J. Acoust. Soc. Am. 63(2), 533–549 (1978)] can be used to describe SRT (dB signal-to-noise ratio) for 50% of sentences correct in stationary noise in normal-hearing (NH) and hearing-impaired (HI) listeners. The extended speech reception threshold model (ESRT) [Rhebergen et al., J. Acoust. Soc. Am. 117, 2181–2192 (2010)] was introduced to describe the SRT in non-stationary noises. With the ESRT model, they showed that the SRT in non-stationary noises is, contra to the SRT in stationary noise, dependent on the non-stationary noise type and noi

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Brochier, Tim J., Amanda Fullerton, Adam Hersbach, Harish Krishnamoorthi, and Zachary Smith. "Deep neural network-based speech enhancement for cochlear implants." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A28. http://dx.doi.org/10.1121/10.0022678.

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Noisy conditions make understanding speech with a cochlear implant (CI) difficult. Speech enhancement (SE) algorithms based on signal statistics can be beneficial in stationary noise, but rarely provide benefit in modulated multi-talker babble. Current approaches using deep neural networks (DNNs) rely on a data driven approach for training and promise improvements in a wide variety of noisy conditions. In this study a DNN-based SE algorithm was evaluated in CI listeners. The network was trained on a large database of publicly available recordings. A double-blinded acute evaluation was conducte

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Rozprawy doktorskie na temat "Types of Noise"

Scott, Sarah Jane. "Comparing Speech Movements in Different Types of Noise." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4226.

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This study examined the impact of several noise conditions on speech articulator movements during a sentence repetition task. Sixty participants in three age groups ranging from 20 to 70 repeated a sentence under five noise conditions. Lower lip movements during production of a target sentence were used to compute the spatiotemporal index (STI). It was hypothesized that STI would be lower (indicating greater stability) in the silent baseline condition. There were changes in speech production under several of the noise conditions. The duration for the 1-talker condition was significantly shorte

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Kvist, Eric, and Rhodin Sandro Lockvall. "A comparative study between MLP and CNN for noise reduction on images : The impact of different input dataset sizes and the impact of different types of noise on performance." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-259654.

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Images damaged by noise present a problem that can be addressed by performing noise-reduction using neural networks. This thesis analyses the performance of two different neural networks, a Mulilayer Perceptron (MLP) and a Convolutional Neural Network (CNN), when performing noise reduction on images. Specifically focusing on the impact of the size of dataset used to train the two different kinds of neural networks has on the performance, as well as how well these two networks perform when reducing different types of noise. This in an attempt to determine whether the use of the more modern type

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Weber, Nicole [Verfasser], Dagmar [Akademischer Betreuer] Haase, Tobia [Akademischer Betreuer] Lakes, and Ulrich [Akademischer Betreuer] Franck. "Using landscape metrics to assess traffic noise, air pollution and temperature conditions : traffic noise, airborne particles and surface temperatures of urban structure types in Leipzig / Nicole Weber. Gutachter: Dagmar Haase ; Tobia Lakes ; Ulrich Franck." Berlin : Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://d-nb.info/1070906220/34.

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Varadarajan, Vaishnevi S. "Analysis and compensation of the Lombard effect under different types and levels of noise with application to in-set/out-of-set speaker recognition." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1442912.

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De, Vito Christie. "Comparison of personal attenuation ratings attained by agricultural and industrial workers for four hearing protection types using the 3M E-A-RFIT dual validation system." Thesis, University of Iowa, 2017. https://ir.uiowa.edu/etd/5457.

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Despite the enactment of hearing protection laws and recommended standards over the last four decades, the prevalence of hearing loss among workers has remained unchanged. Limiting the amount of time spend in high noise areas, as well as wearing hearing protection devices, can reduce the effects of noise on hearing loss. Though research has examined the consistency of use of hearing protection devices (HPD) among workers, the importance of fit, and a real-world comparison to the marketed attenuation needed further examination. The goal of this project is to evaluate the effectiveness of HPDs u

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Fonseca, Eduardo. "Training sound event classifiers using different types of supervision." Doctoral thesis, Universitat Pompeu Fabra, 2021. http://hdl.handle.net/10803/673067.

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The automatic recognition of sound events has gained attention in the past few years, motivated by emerging applications in fields such as healthcare, smart homes, or urban planning. When the work for this thesis started, research on sound event classification was mainly focused on supervised learning using small datasets, often carefully annotated with vocabularies limited to specific domains (e.g., urban or domestic). However, such small datasets do not support training classifiers able to recognize hundreds of sound events occurring in our everyday environment, such as kettle whistles

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Unver, Ozge. "A Modelling Study For The Health Risk Posed By Nuclear Power Plant In Bulgaria At Different Parts Of Turkey." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/729053/index.pdf.

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In this study, following a severe accident at Kozloduy nuclear plant in Bulgaria how Turkey would be affected was investigated. The severe accident refers to core meltdown accident with catastrophic failure of containment. The model used is HySPLIT model developed in America. The worst day was predicted considering deposition of radionuclides. For initial runs, accidental release of I-131 and Cs-137 radionuclides was modeled for each day of year 2000 to find the worst day, seen to result from release beginning on April 7th 2000. After modeling release of all radionuclides for the worst day, ra

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Danisman, Batuhan. "Analysis Of Conventional Low Voltage Power Line Communication Methods For Automatic Meter Reading And The Classification And Experimental Verification Of Noise Types For Low Voltage Power Line Communication Network." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610469/index.pdf.

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In this thesis, the conventional low voltage power line communication methods is investigated in the axis of automated meter reading applications and the classification and experimental verification of common noise types for low voltage power line communication network. The investigated system provides the real time transmission of electricity consumption data recorded by electricity meters, initially to a local computer via a low voltage line through a low speed PLC (Power Line Carrier) environment and subsequently to a corporate network through a high speed data transmission medium. The auto

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Gormez, Baran. "Investigation Of Non-methane Volatile Organic Carbon Emissions From Interior Materials Used In The Intercity Buses." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/4/12605512/index.pdf.

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The objectives of this study are to determine the non-methane volatile organic carbon emissions from the parts used in the interiors of buses at different temperatures and to analyze the components of these emissions. The total non-methane volatile organic carbon (NMVOC) concentrations in various sections of a bus were measured in order to determine the indoor air pollution in the bus. Different samples of the materials used in the interior parts of the buses were provided by the manufacturing company and they were tested in the METU Air Pollution Laboratory in order to see what hydrocarbon co

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McKean, Vanessa. "The role of expectations and visions of the future in the development of target-based environmental policies : the case of the UK Air Quality Strategy." Thesis, University of Sussex, 2015. http://sro.sussex.ac.uk/id/eprint/58039/.

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Increasingly, policy-makers rely on forecasts to set targets for environmental and health protection. I examine the UK Air Quality Strategies (AQS) for particulate matter (1997-2007). Here policy-makers select and articulate visions for technological and policy developments in order to set targets and policies to achieve them. Despite growing evidence for adverse health effects of particulates, challenging targets in 1997 were followed by two revisions of Objectives without introducing measures for reducing pollution. In 2007 more challenging targets were resumed. This thesis is a study of the

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Książki na temat "Types of Noise"

Authority, Massachusetts Turnpike. Draft policy for a pilot type II noise barrier program for the Massachusetts Turnpike Authority. Massachusetts Turnpike Authority, 1990.

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Daywitt, William C. Horn design equations for the NBS horn-type noise standards. U.S. Dept. of Commerce, National Bureau of Standards, 1987.

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Holt, Jack. Dangling noose. Linford, 2008.

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E, Turkel, and Lewis Research Center, eds. High-accuracy compact MacCormack-type schemes for computational aeroacoustics. National Aeronautics and Space Administration, Lewis Research Center, 1998.

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E, Turkel, and Lewis Research Center, eds. High-accuracy compact MacCormack-type schemes for computational aeroacoustics. National Aeronautics and Space Administration, Lewis Research Center, 1998.

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E, Turkel, and Lewis Research Center, eds. High-accuracy compact MacCormack-type schemes for computational aeroacoustics. National Aeronautics and Space Administration, Lewis Research Center, 1998.

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Press, Harsimus, Oregon College of Art and Craft, and Papeterie St-Armand, eds. Noise: Type speaks : specimens of type from the collection of Oregon College of Art and Craft. Harsimus Press, 2011.

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Verner, Gerald. Noose for a lady. Linford, 2013.

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Bounds, Sydney J. Shadow of the noose. Linford, 2008.

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Fox, Mem. Night noises. Harcourt Brace Jovanovich, 1989.

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Części książek na temat "Types of Noise"

Nguyen-Schäfer, Hung. "Induced Noise Types." In Aero and Vibroacoustics of Automotive Turbochargers. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-35070-2_2.

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Pawelczyk, Marek, and Stanislaw Wrona. "Considered types of casings." In Noise-Controlling Casings. CRC Press, 2022. http://dx.doi.org/10.1201/9781003273806-2.

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Roy, Sisir, and Sarangam Majumdar. "Various Types of Noise and Their Sources." In Noise and Randomness in Living System. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9583-4_3.

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Erbe, Christine, Micheal L. Dent, William L. Gannon, et al. "The Effects of Noise on Animals." In Exploring Animal Behavior Through Sound: Volume 1. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97540-1_13.

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AbstractThis chapter describes the effects of noise on animals in terrestrial and aquatic habitats. Potential adverse effects cover a range of behavioral changes and physiological responses, including—in extreme cases—physical injury and death. The types and severity of effects are related to a number of noise features, including the received noise level and duration of exposure, but also depend upon contextual factors such as proximity, familiarity, and the behavioral state in which animals were exposed. The effects of anthropogenic noise on individual animals can escalate to the population l

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Erbe, Christine, Ann Bowles, Dorian Houser, et al. "Behavioral Responses to Underwater Noise." In Marine Mammal Acoustics in a Noisy Ocean. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-77022-7_10.

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Abstract This chapter presents an overview of physical and acoustic behavioral responses of marine mammals to underwater sounds. A literature review was undertaken, and data on received levels at the animal when certain types of responses were observed were compiled in an online supplementary spreadsheet. Based on this, an overview of responses was written, organized first by species and then by sound type. In-air and underwater sound sources were considered. The most studied sound types were mid-frequency sonar and acoustic deterrent devices and then impact pile driving and vessels. The most

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Roy, Sisir, and Sarangam Majumdar. "Various Types of Noise and Their Sources in Living Organisms." In Noise and Randomness in Living System. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9583-4_7.

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Keller, Reto B. "Filtering." In Design for Electromagnetic Compatibility--In a Nutshell. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14186-7_15.

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AbstractIn EMC, filtering helps to minimize emissions of a product and increase the product’s immunity against electromagnetic interference. This chapter presents the concepts of determining the right filter type and ensuring the proper components are chosen regarding power dissipation, noise current type, and high-frequency behavior.Filters can be classified according to their attenuation in the frequency-domain: Low-pass filters High-pass filters Band-pass filters Band-stop filters or according to active components involved or not: Passive filters Active filters or according to the noise cur

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Martin, Bruce, David G. Zeddies, Briand Gaudet, and Joel Richard. "Evaluation of Three Sensor Types for Particle Motion Measurement." In The Effects of Noise on Aquatic Life II. Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-2981-8_82.

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Erbe, Christine, Alec J. Duncan, Alexander Gavrilov, et al. "Sources of Underwater Noise." In Marine Mammal Acoustics in a Noisy Ocean. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-77022-7_2.

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Abstract The marine soundscape, whether in coastal areas or the deepest ocean, in the tropics or at the poles, contains a myriad of sounds. Sounds may be grouped by their origin into geophony (e.g., wind, precipitation, waves, earthquakes, volcanoes, and ice), biophony (e.g., invertebrates, fishes, and marine mammals), and anthropophony (e.g., port construction, mineral and hydrocarbon exploration and production, renewable energy installation, and shipping). This chapter gives a brief overview of the geophony and biophony, and then focuses on the anthropophony. The sounds of boats and ships of

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Gorban, Igor I. "Statistical Stability of Different Types of Noise and Process." In The Statistical Stability Phenomenon. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43585-5_8.

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Streszczenia konferencji na temat "Types of Noise"

Legat, A., and A. Kranjc. "Electrochemical Noise in Various Types of Electrolyte Flow." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04465.

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Abstract In the present study the characteristics of measured electrochemical noise (EN) influenced by different modes of electrolyte movement were studied. The measurements were performed in a still solution, as well as in movement of electrolyte: stirring, and laminar flow with different velocity. Electrolytes with different corrosivity were used. In order to relate measured EN to the development of corrosion processes, digitized images of the electrodes were recorded continuously during these measurements. After the tests were finished, the corroded electrode surfaces were examined also by

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Leban, M., A. Legat, and V. Doleček. "Detection and Differentiation of SCC Processes." In CORROSION 2002. NACE International, 2002. https://doi.org/10.5006/c2002-02438.

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Abstract Electrochemical voltage and current noise were measured during Slow-Rate-Load-Tensile (SRLT) tests on specimens made from two qualities of austenitic stainless steel of type 304: non-sensitized and sensitized. A highly aggressive medium (a diluted aqueous solution of sodium thiocyanate), and a non-aggressive medium (de-ionised water) were used as electrolytes. During the experiments, characteristic simultaneous electrochemical and mechanical transients were observed after the yield point had been reached. Two different types of electrochemical transients were observed: (1) sharp trans

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Ryabchitsky, M. M., D. Ch Tsoi, A. I. Sattarova, K. Yu Ryumshin, and L. M. Kazadaev. "Analysis of Multiple Access Systems Noise Immunity with Various Types of Modulation in Hydrooptical Channel." In 2024 Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO). IEEE, 2024. http://dx.doi.org/10.1109/synchroinfo61835.2024.10617509.

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He, Zhucheng, Pablo Vergara, Masanori Sakaguchi, and Taro Tezuka. "Real-time detection of motifs from semi-synthetic calcium imaging data with various noise types." In 2024 46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2024. https://doi.org/10.1109/embc53108.2024.10782461.

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Elboth, T., D. Hermansen, and Ø. Andreassen. "Some Unusual Types of Noise." In 71st EAGE Conference and Exhibition incorporating SPE EUROPEC 2009. European Association of Geoscientists & Engineers, 2009. http://dx.doi.org/10.3997/2214-4609.201400425.

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Wahl, Thomas J., and J. Stuart Bolton. "The Use of the Wigner Distribution to Identify Wave-Types in Multi-Element Structures." In Noise & Vibration Conference & Exposition. SAE International, 1993. http://dx.doi.org/10.4271/931286.

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SMYRNOVA, Y., J. KANG, L. YU, K. HOROSHENKO, R. PHEASANT, and G. WATTS. "PERCEPTION OF AURAL ATTRIBUTES IN DIFFERENT TYPES OF URBAN ENVIRONMENT." In Noise in the Built Environment 2010. Institute of Acoustics, 2023. http://dx.doi.org/10.25144/17246.

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Kornienko, Vladimir V., and Ilkka Tittonen. "Noise Types in Correlation-Based Target Detection." In 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2023. http://dx.doi.org/10.1109/cleo/europe-eqec57999.2023.10231526.

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M, Jeba Jenitha, Kani Jesintha D, and Mahalakshmi P. "Noise Adaptive Fuzzy Switching Median Filters for Removing Gaussian Noise." In The International Conference on scientific innovations in Science, Technology, and Management. International Journal of Advanced Trends in Engineering and Management, 2023. http://dx.doi.org/10.59544/ozsc7243/ngcesi23p113.

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Recently, in all image processing systems, image restoration plays a major role and it forms the major part of image processing systems. Medical images such as brain Magnetic Resonance Imaging (MRI), ultrasound images of liver and kidney, retinal images and images of uterus images are often affected by various types of noises such as Gaussian noise and salt and pepper noise. All image restoration techniques attempts to remove various types of noises. This paper deals with various filters namely Mean Filter, Averaging Filter, Median Filter, Adaptive Median Filter, Adaptive Weighted Median Filte

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Egwabor, Richard, Robert Langlois, Patrick Kehoe, et al. "The Effect of Speed and Road Type on Sound Pressure Level During Neonatal Patient Transport." In Noise and Vibration Conference & Exhibition. SAE International, 2023. http://dx.doi.org/10.4271/2023-01-1079.

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<div class="section abstract"><div class="htmlview paragraph">Neonatal Infants (neonates) requiring a higher level of care often require transportation via road ambulance to neonatal intensive care units. The trip in the ambulance exposes these infants to potentially harmful noise and vibration. The aim of this study was to categorize the sound level in and around the Neonatal Patient Transport System (NPTS) during transport in ambulances at different speeds and different road types. Data collection was performed in Ottawa, Canada. The road types categorized in the study include ar

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Raporty organizacyjne na temat "Types of Noise"

Choudhury, Sarah, Ross Underhill, and Thomas Krause. PR-652-203801-R04 Magnetometer Noise and Resolution. Pipeline Research Council International, Inc. (PRCI), 2021. http://dx.doi.org/10.55274/r0012196.

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Magnetometers are sensors that measure the magnitude and direction of a magnetic field. There are many types of magnetometers available, but they all rely on electromagnetic principles to measure fields. The most common types are Hall effect, anisotropic magneto-resistive (AMR) and fluxgate sensors. The goal of this study is to investigate several magnetometers to evaluate their capability to detect small changes in an ambient field. These small changes are on the order of 10 milligauss (1 �T) and are caused by the inverse-magnetostrictive effect, or Villari effect, from ferromagnetic pipes. T

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Crocker, Malcolm, P. Raju, and S. Yang. NPR199201 Standard Sound Power Level Specification and Measurement Procedure. Pipeline Research Council International, Inc. (PRCI), 1992. http://dx.doi.org/10.55274/r0011640.

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These guidelines describe a method for in-situ determination of the sound power level of the noise sources in indoor or outdoor environments for gas compressor station equipment using sound intensity measurements. The guidelines contain information on instrumentation, installation and operation of the source, procedures for the selection of a measurement surface, procedures for the sampling of sound intensity on the measurement surface, procedures for the calculation of sound power level, and techniques that can be used to qualify the measurement environment. Typical results obtained for diffe

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Cormier, Renee, Margaret Brown, Diana Humple, William Merkle, David Press, and Kristen Dybala. Vulnerability assessment and conservation recommendations for the northern spotted owl in Marin County, California. National Park Service, 2024. http://dx.doi.org/10.36967/2303475.

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Vulnerability assessments are a common approach to identifying conservation priorities for species and informing resource management decisions by evaluating species? exposure (spatial extent and frequency/intensity) and sensitivity (whether and how a species will respond) to a threat. We assessed the vulnerability of the Northern Spotted Owl (NSO; Strix occidentalis caurina) in Marin County to eight distinct threats: 1) competition with Barred Owls (S. varia); 2) climate change; 3) wildfire; 4) sudden oak death (SOD); 5) other habitat loss/disturbance, specifically from urban development or fu

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White, Kelsey, and Amanda Rapoza. Great Smoky Mountains National Park: Acoustic monitoring report for Cades Cove and Cherokee Orchard roadways, 2023. National Park Service, 2025. https://doi.org/10.36967/2312692.

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The Natural Sounds and Night Skies Division (NSNSD) received a request to collect baseline acoustical data on Great Smoky Mountains National Park (GRSM) roadways. Two acoustic monitoring stations were deployed during the summer (June/July) and winter (November/December) of 2023. The goal of the study was to conduct an acoustic inventory at these locations and to understand the degree to which vehicle noise in general, and specifically utility terrain vehicle (UTV) noise, may affect wildlife and visitor experience. In recent years, there has been an increase in the use of Utility Terrain Vehicl

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Jay. L51710 Active Noise Silencing. Pipeline Research Council International, Inc. (PRCI), 1994. http://dx.doi.org/10.55274/r0010333.

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Many natural gas compressor stations which were previously located away from residential areas are now being encroached upon by surrounding building developments. Furthermore, an increased awareness of community noise issues has proved to be the impetus for investigating and developing more effective noise control methods and treatments for natural gas compressor facilities. This project investigates the feasibility of applying Active Noise Cancellation (ANC) to the exhaust of a large, internal-combustion reciprocating type engine. Large reciprocating internal combustion engines pose significa

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Daywitt, William C. Horn design equations for the NBS horn-type noise standards. National Bureau of Standards, 1987. http://dx.doi.org/10.6028/nbs.ir.87-3073.

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Quinn, Meghan. Geotechnical effects on fiber optic distributed acoustic sensing performance. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41325.

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Distributed Acoustic Sensing (DAS) is a fiber optic sensing system that is used for vibration monitoring. At a minimum, DAS is composed of a fiber optic cable and an optic analyzer called an interrogator. The oil and gas industry has used DAS for over a decade to monitor infrastructure such as pipelines for leaks, and in recent years changes in DAS performance over time have been observed for DAS arrays that are buried in the ground. This dissertation investigates the effect that soil type, soil temperature, soil moisture, time in-situ, and vehicle loading have on DAS performance for fiber opt

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Gallagher, Hilary L., and Richard L. McKinley. Noise Attenuation Performance of the Joint Service Aircrew Mask (JSAM) Type 1 (MPU-5) Rotor Wing (RW) with Flight Helmets. Defense Technical Information Center, 2011. http://dx.doi.org/10.21236/ada550649.

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Kalen, Nicholas. Bats of Colonial National Historical Park following white-nose syndrome. National Park Service, 2023. http://dx.doi.org/10.36967/2299226.

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I conducted bat surveys at Colonial National Historical Park to assess the status of bat communities following potential impacts of white-nose syndrome (WNS) since its arrival in Virginia in 2009. This disease, caused by the fungus Pseudogymnoascus destructans, has severely reduced populations of several bat species in the eastern United States, threatening some with regional extirpation. In the East, most-affected species include the little brown bat (Myotis lucifugus), the federally-endangered northern long-eared bat (Myotis septentrionalis) and Indiana bat (Myotis sodalis) (USFWS 2007, USFW

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Kalen, Nicholas. Bats of Petersburg National Battlefield following white-nose syndrome. National Park Service, 2023. http://dx.doi.org/10.36967/2299217.

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I conducted bat surveys at Petersburg National Battlefield Park (PETE) to assess the status of bat communities following potential impacts of the disease white-nose syndrome. This disease, caused by the fungus Pseudogymnoascus destructans, has severely reduced populations of several bat species in the eastern United States, threatening some with regional extirpation. Most affected species include the little brown bat (Myotis lucifugus), the federally-endangered northern long-eared bat (Myotis septentrionalis) and Indiana bat (Myotis sodalis) (USFWS 2007, USFWS 2022a), as well as the tricolored

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