Online tests yield robust thresholds with the right auditory hygiene

Most human auditory psychophysics research has been conducted with extreme 'auditory hygiene' in carefully controlled environments, with calibrated audio equipment, and potentially hours of repetitive testing with expert, well-characterized listeners. The incompatibility of web-based platforms with such experimental regimes would seem to preclude online auditory psychophysical paradigms, where success may hinge on absolute sound presentation level, reliably estimated perceptual thresholds, and sustained motivation, attention, and vigilance. Here, we introduce and validate a set of procedures that aim to address these challenges and facilitate successful online auditory psychophysics research. First, we establish a simple means of setting sound presentation levels where online participants serve as their own sound level meter. Across a set of three experiments conducted in person, we demonstrate the stability and robustness of this volume setting procedure both 'in the wild' and in controlled settings. Second, we test participants' tone-in-noise thresholds using widely adopted online experiment platforms, and demonstrate that reliable threshold estimates can be derived in approximately one minute of testing. Third, using these sound level setting and thresholding procedures to establish participant-specific stimulus conditions, we show that frequency-selective attention can be reliably demonstrated in individual participants with an online implementation of the classic, yet challenging, probe signal psychophysics paradigm. Finally, we show how threshold and attentional measures relate to well-validated assays of online participant fatigue, task confidence, and apathy acquired at multiple timepoints across the task. In all, this demonstrates the promise of asking new questions in auditory neuroscience with classic, yet challenging, online psychophysics paradigms. The code to duplicate our results is publicly available in JavaScript, through both Pavlovia (pavlovia.org) and Gorilla (gorilla.sc).

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Analysis of Vibration and Noise on Vibrating Screen at PT. Mifa Bersaudara

Jurnal Inotera ◽

10.31572/inotera.vol6.iss2.2021.id150 ◽

2021 ◽

Vol 6 (2) ◽

pp. 106-111

Author(s):

Herdi Susanto ◽

Kamarullah

Keyword(s):

Health And Safety ◽

Sound Level ◽

Sound Level Meter ◽

Measurement Point ◽

Vibration Level ◽

Vibrating Screen ◽

Average Value ◽

Level Meter ◽

The Right ◽

Maximum Limit

The purpose of this study was to analyze the level of vibration and noise on the Equipment Vibrating screen crusher FC 02 at PT. MIFA Bersaudara. Vibration is measured using a vibration meter, noise is measured by a digital sound level meter. Measurements are made on the x, y and z axes at each measurement point. The results showed that the value of the vibration level on the Vibrating screen crusher FC 02 on the x-axis with the velocity value of 28.56 mm/s, the y-axis value of 29.82 mm/s and the z-axis velocity value of 25.46 mm/s. While the Acceleration value on the x-axis is 20.7 m/s 2 the value is 30.86 m/s 2on the y and z axes of 21.42 m/s 2 . While the noise value indicates that the average value on the right side is 99.6 dBA on the right side and 101.7 dBA on the left side. Efforts were made to overcome the problem, namely by not operating the VSC FC 02 exceeding the recommended maximum limit of 60 dBA and the maximum allowed which is 70 dBA so as to prevent problems of comfort, health, and safety at work. Operators and employees are advised to stay at the location for no more than 15-30 minutes, if more than that time must use safety earmuffs.

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Symmetrizable Difference Dchemes

Computational Methods in Applied Mathematics ◽

10.2478/cmam-2005-0001 ◽

2005 ◽

Vol 5 (1) ◽

pp. 3-50 ◽

Cited By ~ 2

Author(s):

Alexei A. Gulin

Keyword(s):

Initial Data ◽

Difference Scheme ◽

Difference Schemes ◽

Time Dependent ◽

Stability Boundaries ◽

Typical Representative ◽

Variable Weight ◽

The Stability ◽

Conditions Of Stability ◽

The Right

AbstractA review of the stability theory of symmetrizable time-dependent difference schemes is represented. The notion of the operator-difference scheme is introduced and general ideas about stability in the sense of the initial data and in the sense of the right hand side are formulated. Further, the so-called symmetrizable difference schemes are considered in detail for which we manage to formulate the unimprovable necessary and su±cient conditions of stability in the sense of the initial data. The schemes with variable weight multipliers are a typical representative of symmetrizable difference schemes. For such schemes a numerical algorithm is proposed and realized for constructing stability boundaries.

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Pemanfaatan Metil Ester Sulfonat pada Pembuatan Deterjen Cair

Jurnal Riset Teknologi Industri ◽

10.26578/jrti.v7i14.1544 ◽

2016 ◽

Vol 7 (14) ◽

pp. 143-155

Author(s):

Eldha Sampepana ◽

Suroto Hadi Saputra

Keyword(s):

Fatty Acids ◽

Methyl Ester ◽

Linear Alkylbenzene Sulfonate ◽

Emulsion Stability ◽

Alcohol Sulfate ◽

Stable Emulsion ◽

Linear Alkylbenzene ◽

Alkylbenzene Sulfonate ◽

The Stability ◽

The Right

In the manufacture of detergents still using surfactants (which serves as an emulsifier) of crude oil in the form of the AS. (alcohol sulfate) and LAS (linear alkylbenzene sulfonate), where this type of surfactant cannot be degraded by microorganisms when discharged into the environment, causing environmental pollution. Methyl ester sulfonate surfactant is an anionic surfactant which has a composition of C16 - C18 fatty acids are capable of acting against nature deterjensinya, while the C12 - C14 fatty acids contribute to the foaming effect. The purpose of this study was to look for the formulation of methyl ester sulfonate (MES) the right to produce a good detergent by using materials such as methyl ester sulfonate surfactant self-made, methyl ester sulfonate and sodium lauryl market Ester Sulfate (SLS) with a concentration of 15 %, 20 % and 25 %. Detergent results of the study have high detergency ( net ) compared with the detergency of detergent commercial, have a stable emulsion stability, the stability of the foam/foam detergent power made from methyl ester sulfonate surfactant produces less foam, compared with a detergent made from SLS and surfactant SNI 06-4075-1996 standards.

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Electroacoustics. Methods to determine corrections to obtain the free-field response of a sound level meter

10.3403/30194377u ◽

2015 ◽

Keyword(s):

Free Field ◽

Sound Level ◽

Sound Level Meter ◽

Field Response ◽

Level Meter

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Measurement of Noise inside the Compartment and Vibration on both Sides of Elastomeric Powertrain Mounts of Passenger Car

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.471.59 ◽

2013 ◽

Vol 471 ◽

pp. 59-63

Author(s):

Mohd Noor Arib Rejab ◽

Roslan Abd Rahman ◽

Raja Ishak Raja Hamzah ◽

Jawaid Iqbal Inayat Hussain ◽

Nazirah Ahmad ◽

...

Keyword(s):

Fast Response ◽

Sound Level ◽

Measurement Noise ◽

The Other ◽

Vibration Level ◽

Test Conditions ◽

Exhaust Noise ◽

Run Up ◽

Level Meter ◽

High Level

This paper presents an evaluation on elastomeric mount used to isolate vibration from powertrain to chassis or structure vehicle. The assessments started with measurement of noise inside compartment, and exhaust noise. This is followed by the measurement of vibration on both sides of elastomeric mounts. The noise in the compartment and exhaust noise is measured according to BS 6086: 1981 and BS ISO 5130: 2007. The noise in the compartment and vibration is tested in three conditions. Firstly, engine is run-up with load (driving at second gear); secondly, without load; and thirdly, without load but hanging. A microphone is fixed at the ear of the mannequin. The fast response and A weighting sound level meter were used for measurement noise in the compartment and exhaust noise. The vibration is measured in terms of acceleration on both sides of each elastomeric powertrain mounts. Two accelerometer transducers are fixed on both sides of powertrain elastomeric mounts. One side was identified as a source of vibration and the other as receiver of vibrations. The results showed that the pattern of overall vibration level on source and receiver increased from 1050 RPM (idling) to 4000 RPM on all test conditions. Vibration transmitted to chassis or receiver structure was analyzed using transmissibility concept. By evaluating test condition of engine run-up without load, informed that the front and rear mounts showed a high level transmissibility contributing to structure-borne noise.

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The training schedule affects the stability, not the magnitude, of the interlimb transfer of learned dynamics

Journal of Neurophysiology ◽

10.1152/jn.01072.2012 ◽

2013 ◽

Vol 110 (4) ◽

pp. 984-998 ◽

Cited By ~ 37

Author(s):

Wilsaan M. Joiner ◽

Jordan B. Brayanov ◽

Maurice A. Smith

Keyword(s):

Short Duration ◽

Dynamic Environment ◽

Internal Representation ◽

Motor Adaptation ◽

Training Period ◽

Visually Guided ◽

Brief Training ◽

Long Duration ◽

The Stability ◽

The Right

The way that a motor adaptation is trained, for example, the manner in which it is introduced or the duration of the training period, can influence its internal representation. However, recent studies examining the gradual versus abrupt introduction of a novel environment have produced conflicting results. Here we examined how these effects determine the effector specificity of motor adaptation during visually guided reaching. After adaptation to velocity-dependent dynamics in the right arm, we estimated the amount of adaptation transferred to the left arm, using error-clamp measurement trials to directly measure changes in learned dynamics. We found that a small but significant amount of generalization to the untrained arm occurs under three different training schedules: a short-duration (15 trials) abrupt presentation, a long-duration (160 trials) abrupt presentation, and a long-duration gradual presentation of the novel dynamic environment. Remarkably, we found essentially no difference between the amount of interlimb generalization when comparing these schedules, with 9–12% transfer of the trained adaptation for all three. However, the duration of training had a pronounced effect on the stability of the interlimb transfer: The transfer elicited from short-duration training decayed rapidly, whereas the transfer from both long-duration training schedules was considerably more persistent (<50% vs. >90% retention over the first 20 trials). These results indicate that the amount of interlimb transfer is similar for gradual versus abrupt training and that interlimb transfer of learned dynamics can occur after even a brief training period but longer training is required for an enduring effect.

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Testing of Sonic-Absorbent Panels’ Behavior in Open-Air Environment

Volume 12: Vibration, Acoustics and Wave Propagation ◽

10.1115/imece2012-86823 ◽

2012 ◽

Author(s):

Petru A. Pop ◽

Patricia A. Ungur ◽

Liviu Lazar ◽

Mircea Gordan ◽

Florin M. Marcu

Keyword(s):

High Frequency ◽

Noise Pollution ◽

Sound Level ◽

Sound Level Meter ◽

Data Logger ◽

Public Buildings ◽

Gypsum Plaster ◽

Level Meter ◽

And Control

One wildly used method to reduce and control the noise pollution in green city’s buildings is using sonic-absorbent panels. Their applications can be multiple, such as the insulation of buildings, acoustic barriers and fences along the highway or in front of supermarkets, hospitals and other public buildings. This paper presents a method for testing the behavior of sonic-absorbent panels in open-air environment. The work represents a carrying on of previous research about absorbent materials from gypsum family, tested in lab conditions. The experiment setup used a dynamic installation and as a sample a stand formed by six sonic-absorbent panels from special modeling alpha-gypsum plaster. This installation has been composed of two loudspeakers for emitting the sound at a well-defined frequency by the first laptop, the microphone for detecting and transmitting the signal to the second laptop for analyzing and processing the data. All operations were performed using MATLAB Programs, while a Data Logger Sound Level Meter type CENTER 332 was put on near the microphone to compare both results. The first experiment of acoustic stand has been realized by setting up the installation at a frequency from 50 Hz to 1250 Hz and altering the distance between loudspeakers and stand at 0.5m to 1m and 1.5m, respectively. The second experiment kept the same test’s conditions, while two and three layers of sonic-absorbent panels formed the stand, respectively, but at same distance from source of 0.5 m. In both tests, the results underlined the good sonic-absorbent properties of these panels, especially at medium and high frequency, which can recommend using the panels for multiple outside applications.

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CRITICAL REVIEW OF EMULSION STABILITY AND CHARACTERIZATION TECHNIQUES IN OIL PROCESSING

Journal of Energy Resources Technology ◽

10.1115/1.4051571 ◽

2021 ◽

pp. 1-36

Author(s):

Vahideh Angardi ◽

Ali Ettehadi ◽

Özgün Yücel

Keyword(s):

Separation Efficiency ◽

Petroleum Industry ◽

Cost Effective ◽

Downstream Processing ◽

Physical Factors ◽

Comprehensive Review ◽

Factors Affecting ◽

Mathematical Explanations ◽

The Stability ◽

The Right

Abstract Effective separation of water and oil dispersions is considered a critical step in the determination of technical and economic success in the petroleum industry over the years. Moreover, a deeper understanding of the emulsification process and different affected parameters is essential for cost-effective oil production, transportation, and downstream processing. Numerous studies conducted on the concept of dispersion characterization indicate the importance of this concept, which deserves attention by the scientific community. Therefore, a comprehensive review study with critical analysis on significant concepts will help readers follow them easily. This study is a comprehensive review of the concept of dispersion characterization and conducted studies recently published. The main purposes of this review are to 1) Highlight flaws, 2) Outline gaps and weaknesses, 3) Address conflicts, 4) Prevent duplication of effort, 5) List factors affecting dispersion. It was found that the separation efficiency and stability of dispersions are affected by different chemical and physical factors. Factors affecting the stability of the emulsions have been studied in detail and will help to look for the right action to ensure stable emulsions. In addition, methods of ensuring stability, especially coalescence are highlighted, and coalescence mathematical explanations of phenomena are presented.

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Pemetaan Dan Perhitungan Pemaparan Tingkat Kebisingan Pada Industri Pengolahan Kayu Di Kecamatan Siak, Provinsi Riau

Al-Ard Jurnal Teknik Lingkungan ◽

10.29080/alard.v6i2.1185 ◽

2021 ◽

Vol 6 (2) ◽

pp. 68-76

Author(s):

Aryo Sasmita ◽

Muhammad Reza ◽

Rodesia Mustika Rozi

Keyword(s):

Sound Level ◽

Sound Level Meter ◽

Noise Mapping ◽

Level Meter

Dalam kegiatan operasionalnya CV. X yang bergerak pada pengolahan kayu, berpotensi menimbulkan kebisingan yang berasal dari mesin-mesin yang digunakan dalam proses produksi pallet. Kebisingan di perusahaan ini dapat berpengaruh terhadap kesehatan dan kenyamanan pekerja. Penelitian ini bertujuan untuk mengetahui intensitas kebisingan yang dihasilkan oleh mesin produksi, lama waktu pemaparan, pemetaan kebisingan dan upaya pengendalian kebisingan. Metode pengukuran kebisingan mengacu pada metode noise mapping dan alat yang digunakan adalah Sound Level Meter. Data yang diperoleh kemudian diolah menjadi peta kontur dengan variasi warna biru, hijau, kuning, ungu dan merah. Hasil penelitian menunjukkan tingkat kebisingan tertinggi sebesar 99,4 dB dan tingkat kebisingan terendah sebesar 67,3 dB. Berdasarkan hasil perhitungan menggunakan persamaan NIOSH dari 128 titik pengukuran metode noise mapping terdapat 38 titik dengan tingkat kebisingan >85 dB yang menunjukkan waktu pemaparan di atas standar yang sudah direkomendasikan NIOSH. Tingkat kebisingan tertinggi sebesar 99,4 dB dengan lama pemaparan selama 0,3 jam dan tingkat kebisingan terendah sebesar 67,3 dB dengan lama pemaparan selama 475 jam. Upaya pengendalian yang dapat dilakukan untuk mengurangi kebisingan seperti pengendalian dari sumber, jalur transmisi, dan penerima.

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