bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental study on outdoor sound propagation under various meteorological conditions
Authors: Yokota Takatoshi , Makino Koichi , Iizumi Genki , Tsutsumi Takuya
Published: December 2023

From the winter of 2018 through the spring of 2021, outdoor sound propagation experiments were repeatedly conducted three times a day on weekdays at a glider airfield in Hokkaido, Japan. In each experiment, impulse responses at the points of 155 m and 300 m from sound sources were measured.
The ground surface condition of the experimental field was grass-covered in summer and snow-covered in winter. The monthly averages of sound pressure levels under upwind, downwind, and calm conditions were calculated every month. The data show that the seasonal variation depends on wind conditions,
propagation distance, and frequencies. At the point of 300 m from sound sources, the seasonal variations are small under downwind conditions, whereas the range of variations is about 10 dB at high frequencies under upwind conditions and calm conditions. The relationship between vector wind
speed and excess attenuation is discussed focusing on differences in atmospheric stability, snowfall, and snow cover conditions, respectively. We also introduce trial calculation results assuming the logarithmic-liner effective sound speed profiles and the parameters of turbulence proposed
in previous studies.
Evaluating the effects of cavitating refrigerant flow on noise radiation from electronic expansion valve: a numerical study
Authors: Lee Sangheon , Cheong Cheolung , Lee Byeonghwi , Park Sangkyoung
Published: December 2023

The electronic expansion valve (EEV) is a critical component in air conditioners, responsible for regulating refrigerant flow rate and controlling the cooling or heating performance. However, it is also a significant source of noise. When the valve opening ratio is low, the increased
flow velocity of the refrigerant can cause pressure to drop below the vapor pressure and result in a cavitation flow. This type of flow is known to produce higher levels of flow noise compared to single-phase liquid refrigerant flow. A Large Eddy Simulation is utilized to compute the internal
flow of the EEV, incorporating a homogeneous mixture model to model cavitation phenomena. The structural vibration of the EEV and its inlet/outlet pipe wall is computed using high-resolution finite element methods with excitation force from internal wall pressure fluctuations. The near and
far field noise radiation from the structure is calculated using finite and boundary element methods, respectively. The developed numerical methods are applied to two operating conditions: single-phase and two-phase. The results indicate that the noise radiation from the EEV is 6.5 dB higher
in the cavitating flow than in the single liquid flow, closely matching the measured data. The current numerical methodology is expected to be useful in designing low-noise EEV units.
Effect of Small Concaves Surface on the Acoustical Characteristics of Chicken Feather Panel
Authors: Faharuddin Ansarullah , Kamil Kusno , Asniawaty  , Basalamah Abdullah
Published: December 2023

This study aims to determine the impact of small concave surfaces on the acoustic characteristics of chicken feather panels. Based on the feather-glue ratio reference, the researchers applied a mixture of 70% feather and 30% PVAc for the production of the specimens. In the first stage,
the absorption coefficient of the specimen on a small concave surface (CS) was measured using an impedance tube type B&K 4602 with two microphones and a set of computer FFT analyzers. The measurement results were then compared with the absorption coefficient of similar test objects with
flat surfaces (FS). The acoustic characteristics of the two types of surfaces (FS and CS) in the specimen panel showed the maximum absorption coefficient (α) value of 0.52 and 0.63 for FS and CS, respectively. These results indicate that specimens with a small concave surface (CS) have
a relatively higher absorption coefficient than those with a flat surface (FS). However, further studies are needed to identify other characteristics of these acoustic panels, including their resistance to environmental influences.
Numerical analysis of underwater acoustics in the presence of complex flow
Authors: Duan Lishu , Jiang Hanbo
Published: December 2023

Sound waves are the most crucial tool of communication and detection for underwater vehicles. Wave propagation in underwater environment is usually complex, especially in the presence of small-scale turbulence. Conventional wave-based approaches may be computationally prohibitive for
performing accurate simulations in such environments. In this work, the Gaussian beam tracing (GBT) method is adopted for its advantages in terms of efficiency, robustness and accuracy. The characteristics of sound field generated by a two-dimensional line source under the influence of vortex
is investigated. The effects of factors such as source frequency and vortex intensity are discussed. The results show that the non-uniform flow field induced by vortex has significant influences on the sound propagation.
Exploring integrated seating structures in fully autonomous vehicles from an NVH perspective
Authors: Whimpey Shaun , Rolfe Bernard , Ghabraie Kazem , Fard Mohammad
Published: December 2023

An intrinsic need exists in the transport vehicle industry to reduce vehicle weight and enhance safety and comfort. This need extends to fully autonomous vehicles, which will gain commonality over time. Since fully autonomous vehicles remove the need for human driver input, a rethink
is required to optimise safety, given that the seating designs and configurations in these vehicles could be different. One avenue to potentially increase fully autonomous vehicle safety is integrating the front-row seating into the main body structure. Since an increase in stiffness results
in an increase in structural vibration modes and frequencies, it is possible to assess vehicle safety and structural performance through a vibration study. The proposed integrated seating concept has been compared with the existing seating models to assess design feasibility. Increasing safety
for fully autonomous vehicles will improve their comfort perception and crash safety. By studying the vibration characteristics of an integrated seating structure, an initial understanding can be ascertained that points the successful design of one in the right direction.
Datasets for Detection and Localization of Speech Buried in Drone Noise
Authors: Ko Jong Hwan , Chang Jiho , Rho Daniel , Kim Taesoo
Published: December 2023

This paper introduces datasets for detection and localization of speech buried in drone noise based on a scenario that a drone is used to search and rescue victims in disaster situations with microphones mounted in the drone. Since the distances between the blades and the microphones
are short, the signal-to-noise ratio (SNR) can be exceptionally low. To emulate these signals, drone noise and impulse responses for convolving voice signals were recorded outdoor, and the voice signals were mixed in relatively low levels. The resultant SNRs of the present datasets was below
-5 dB on average, which makes localization and detection fairly challenging. Detection and localization results with some baseline methods including a convolutional neural network (CNN) were presented. These datasets can be useful to develop and improve deep neural networks for rescue drones.
Experimental study on the widening of the sound isolation characteristics of light weight sound isolation structure using inflated membrane with air
Authors: Kaise Tomoaki , Inoue Satoshi
Published: December 2023

Light sound insulation structure by using membrane and air pressure (hereinafter refer to as MSI), which consists of meshes and pressurized membranes, exhibits varying sound insulation characteristics and can be effective for the isolation of low-frequency sound even at a lightweight.
However, MSI is ineffective for broadband noise owing to the limited valid frequency range of its sound insulation characteristics. Additionally, the stiffness of the frame of MSI, which constrains the meshes and membrane, must be enhanced as the sound insulation performance in the stiffness-law
region depends on the stiffness. To resolve these issues, we focused on the specification of the meshes and the constraint condition of MSI. In this study, first, we evaluated the sound reduction index of a MSI combined with meshes of different specification on the surface and rear of the
pressurized membrane. The results revealed that the MSI exhibited sound insulation characteristics with less reduction in sound insulation performance compared to the MSI consisting of mesh with the same specification. Second, we evaluated the sound reduction index of MSI divided by glazing
bars within the frame that reinforce the stiffness of MSI. The results revealed that the sound insulation performance in the stiffness-law region can be improved by narrowing the space between bars.
Visualization of scattered sound field by enclosing microphone array based on sparse equivalent source method
Authors: Onizawa Ryosuke , Tsunokuni Izumi , Ikeda Yusuke
Published: December 2023

Sound field visualization is useful for understanding complicated sound fields. The visualization of direct and scattered sound fields separately is useful for designing acoustic scattering objects. Numerical simulation methods, such as the boundary element method, are employed to obtain
the scattered sound field. However, obtaining accurate boundary conditions for these simulations is difficult. In this paper, we propose a method for estimating the scattered sound field by simultaneously modeling the direct and scattered sound fields using the sparse equivalent source method.
In the proposed method, we can only visualize the scattered sound field using equivalent sources. In simulation experiments, we evaluated the estimation accuracy of the proposed method.
Challenges in predicting and managing construction noise impacts in urban environments. Case studies from Sydney, Australia
Authors: Parnell Jeffrey
Published: December 2023

Approval of major infrastructure projects in Australia is contingent on a vigorous environmental assessment process demonstrating that the impacts from such proposals are acceptable and can be satisfactorily managed. As part of this process, an assessment of construction noise is undertaken
by predicting the level and duration of impact. Given the scale, complexity and programs for delivery of major infrastructure projects such as the Sydney Metro, the approach to assessment of environmental impacts is typically undertaken based on early concept designs, and assumptions which
enable potential worst-case impacts to be considered. Ongoing design development and construction methodologies continue to occur, and are finalised by the contractor responsible for delivering the package of works for the project. Layers of conservatism could therefore be built into the process
to ensure that environmental impacts are understood, and appropriate mitigation measures are considered. Moreover, common predictive noise modelling tools are believed to under-estimate the level of barrier insertion loss provided by residential buildings in urban scenarios, further exacerbating
the over-prediction of construction noise impacts. By use of case studies, the present paper examines the challenges of assessing and managing construction noise associated with a major infrastructure project in Sydney, Australia.
Measurements of wild finless porpoise (Neophocaena asiaeorientalis sunameri) on-axis burst-pulse sound
Authors: Ogawa Mayu , Kimura Satoko S.
Published: December 2023

Most small odontocetes utilize burst pulses and whistles as means of communication. However, limited research conducted on burst pulses produced by species that do not produce whistles. This study represents the first to measure on-axis burst pulses emitted by wild finless porpoises
(Neophocaena asiaeorientalis sunameri) in Japan, which are classified as a non-whistling species. Passive acoustic monitoring was conducted in the Seto Inland Sea from June to Sepetember 2021 using A-tags and a SoundTrap 300HF. We measured eight parameters of burst pulses: apparent source
level, inter-pulse interval, peak frequency, center frequency, -3dB bandwidth, pulse duration, number of pulses, and total duration. Apparent source level of the burst pulses ranged from 150 to 165 dB re 1 μPa, averaging 157 ± 3 dB re 1 μPa. -3dB bandwidth of the burst pulses
ranged from 14 to 31 kHz, averaging 22 ± 5. Burst pulses had lower sound pressure levels and wider bandwidths comparing to regular clicks, which are pulsed sounds utilized for echolocation purposes. This observed disparity can be attributed to the fundamental characteristic of burst
pulse, their high repetition rate. Notably, the burst pulses of finless porpoise did not exhibit any frequencies below 100 kHz.
Local soundmark to conquer traffic noise. Case of Kotagede, Indonesia
Authors: Mediastika Christina Eviutami , Sudarsono Anugrah Sabdono , Utami Sentagi Sesotya , Setiawan Teguh , Mansell James G. , Cliffe Laurence , Santosa Revianto B. , Yanti Ressy J.
Published: December 2023

Indonesia is noisy; traffic noise dominates almost all areas; noise regulations need to be updated, and noise is not a problem for Indonesians. It makes the unique sound disappear over time, leaving a uniform sound environment in Indonesia. Kotagede, the former capital of the ancient
Mataram Kingdom, currently a preserved historical site and one of the tourist destinations in Yogyakarta Province, is facing a similar problem of losing unique soundmarks along with changes in people's lifestyles. It was exacerbated because the remaining soundmark had to cope with the traffic
noise that plagued main roads and narrow alleys. This study collected quantitative and qualitative data regarding current noise and unique soundmarks in the past. It was revealed that the noise of Kotagede, which mainly functions as a residential area, generally exceeds 60 dBA, and some get
closer to 80 dBA, dominated by human and traffic noises, especially from motorbikes passing through narrow alleys. Meanwhile, local cultural figures describe that Kotagede used to be rich in various sounds that are sorely missed today. They describe the soundmark as the orchestra embellishing
their routines. Further studies are underway to follow up on these findings to revive soundmark and lower noise.
A Basic Study on a Method for Sound Source Localization Using Distributed Acoustic Measurement Equipment
Authors: Ikemi Itsuki , Harada Kazunori , Sugahara Akiko , Hiraguri Yasuhiro
Published: December 2023

The purpose of this study is to develop a system that can detect sound source localization in a plane using a cross-correlation function between acoustic signals recorded by microphones distributed in a plane. An anechoic chamber experiment showed that the system was capable of estimating
the location of stationary sound sources with plus or minus 20 mm accuracy. As well as estimating the locations of moving sources of sound, the system was also able to locate them with an error of approximately 10 mm. A Raspberry Pi equipped with an A/D converter, microphone, and GPS module
was then used to develop an acoustic measurement device. This was used to identify sound source location by using time synchronization with GPS signals in an outdoor space.
Active vibration control for window rattling caused by infrasound: Field experiment for one pair of sliding glass doors installed on the test building
Authors: Iwanaga Keiichiro , Doi Tetsuya , Omoto Akira
Published: December 2023

We developed an active vibration control system to reduce window vibration caused by infrasound since serious environmental noise problems such as window rattling have remained in Japan. In our previous study, we demonstrated the application of active noise control for the window vibration
to reduce the transmitted sound into the room by using the low-frequency sound generator as the secondary source. However, active noise control using sound waves has the problem of increasing the sound pressure level in some areas outside the control window. Therefore, we developed an active
vibration control system equipped with self-made inertial vibration exciters and laser displacement gauges to reduce the window vibration caused by infrasound without increasing the sound pressure level. An experiment was conducted to investigate the applicability of the developed active vibration
control system to reduce window vibration. The vibration of one pair of sliding glass doors installed in the test building was controlled by the developed systems mounted on windows so that vibration displacement became static. As a result, the displacement of window vibration caused by infrasound
was reduced by one-third without increasing the sound pressure level outside the test building. This vibration reduction resulted in the transmitted sound into the room by up to 11 dB within the frequency range below 16Hz.
Three-dimensional sound field reproduction using reflected sounds based on pressure-matching with equivalent sources
Authors: Obata Yuya , Suzuki Yukika , Tsunokuni Izumi , Ikeda Yusuke
Published: December 2023

Three-dimensional sound field reproduction generally requires more loudspeakers as the arrival direction of the desired sound increases. In particular, to reproduce the sound field in the vertical direction, the number of loudspeakers is significantly increased. In this study, we propose
a three-dimensional sound field reproduction method that use the sound reflections from the floor surface to reduce the number of loudspeakers in the vertical direction. First, the sound field driven by each loudspeaker is modeled by considering the primary reflection. Second, based on the
pressure matching method with the loudspeaker sound field models, the sound field is reproduced from the unplaced direction of the loudspeakers using the primary reflected sounds. Via simulation experiments, we evaluate the reproduction accuracy of the proposed method in the horizontal and
elevation planes.
Application of sound field reproduction system to acoustic welfare engineering - Real time sound field transmission system for parent and child room in a concert hall -
Authors: Miyahara Norika , Omoto Akira
Published: December 2023

This study attempted to implement a real-time sound field reproduction system for a parent-child (PC) room in a concert hall as an example of acoustic welfare engineering. The PC room is typically located at the rear of a hall where visitors with their children can enjoy performances
without hesitation, but the sound quality is rarely discussed. This study attempts to improve this situation using a multi-channel reproduction system. Specifically, we implemented a system in which the directional impulse response of the hall measured by a microphone array is convolved in
real-time with the sound played and captured separately on stage and reproduced by a loudspeaker array installed in a PC room. The 24-channel system, in which the polar and azimuth angles are both 45 degrees apart, our standard procedure, was found to have a high degree of physical reproducibility.
Still, it needed to be more practical considering poor room conditions such as large windows. Therefore, we introduced panning using loudspeakers above and below the window frame instead of using the front loudspeakers. The impulse responses of the original and reproduced sound fields were
compared, and it was found that the reproducibility was maintained even with the introduction of the panning.
Cultivating a harmonious soundscape in urban public space: An empirical study of sound and activities
Authors: Nitidara Ni Putu Amanda , Sudarsono Anugrah Sabdono , Sarwono Joko
Published: December 2023

This study examines the relationship between sound and activities in urban public spaces in an attempt to create a pleasant acoustic environment that improves the quality of activities conducted in such areas. The study collected data from park visitors in Bandung using field measurements
and questionnaires. The findings indicate that sound sources have a more significant effect on visitors' participation in activities than the overall soundscape quality. Visitors would continue to engage in activities despite the high traffic noise levels as long as the appropriate sound sources
are present. Additionally, the study identified that the Social-Nature Connection activities require a soundscape that is lower in background noise, has some of the natural sound components, and with the addition of music to provide some dynamic vibes. On the other hand, the Restorative Retreats
activities show no relation with either sound sources or noise level, and Exploring Natural Landscapes activities are influenced positively by man-made sound, specifically recreational sound. This study provides valuable insights that may be used to improve the design of soundscapes in urban
public spaces, enabling designers to create a more balanced acoustic environment that supports various activities and enhances the quality of visitors' experiences.
Classification of the location of floor impact noise using AI model based on temporal, spectral, and spatial features in apartment building
Authors: Kim Jeonghun , Ryu Jongkwan
Published: December 2023

In Korea, conflicts are occurring due to misidentification of the floor impact noise (upper floor or other floors). In this study, the characteristics of floor impact noise that can effectively classify the location of floor impact noise were investigated using AI. Floor impact noise
was recorded on the upper 3 floors and the lower 3 floors based on the excitation floor, and temporal, spectral, and spatial features were extracted for each floor location of floor impact noise. Based on the extracted features, the location of floor impact noise was classified through CNN
and ANN. The performance of the models through each feature was compared and analyzed with the accuracy values shown through the same data. Finally, this study presented the most effective features and AI models for classifying the location of floor impact noise.
Application of 3D acoustic scene analysis using sound arrival direction at Noi Bai International Airport in Vietnam
Authors: Sakoda Keishi , Yamada Ichiro , Nguyen Thu Lan , Vu Thi Thanh
Published: December 2023

This paper discusses improvement of 3D acoustic scene analysis based on sound arrival direction for airport noise monitoring as well as illustrates a result of application using noise observations of unattended noise monitoring at four noise monitors installed near the both ends of
two closed-parallel runways at Noi Bai International Airport in Vietnam. The static analysis method visualized the noise level distribution in the focused direction by varying the analysis time. Estimation of sound source movement trajectories not only for landing paths but also for takeoff
paths was also realized. The result suggests that the proposed method is useful for identifying noise contributions of various sound sources including aircraft take-off and landing operations aircraft ground operation on the apron and taxiway.
Jet Noise Prediction Benchmark for Landing and Takeoff Noise of Supersonic Aircraft
Authors: Jaron Robert , Gräbert Matti , Habing Remco , Meulen Mark-Jan van der , Huet Maxime , LeGriffon Ingrid , Petrosino Francesco , Barbarino Mattia , Lefarth Katharina , Zaporozhets Oleksandr
Published: December 2023

This paper presents a brief overview of the EU-Project SENECA (LTO noiSe and EmissioNs of supErsoniC Aircraft) aiming to support certification authorities and the International Civil Aviation Organization's Committee on Aviation Environmental Protection (ICAO CAEP) by providing comprehensive
and reliable data regarding the achievable noise levels during takeoff and landing and the global climate impact of civil supersonic aircraft. The focus of the paper is on the jet noise prediction benchmark test conducted by the project members to increase the reliability of the calculated
noise certification levels. The objectives are to validate a correct implementation of the models and to identify the most suitable models for predicting jet noise of this specific type of supersonic aircraft engines. Overall three different semi-empirical jet noise models were used on four
different test cases from literature. Results show remarkable differences of the predicted spectra. As expected the models fit their respective experimental data sets better than other models.
Restoration Effect Through VR Soundscape and Traditional Music Contents Experience
Authors: Lee Haram , Luo Ylhong , Yoon Hyowon , Kim Seonkyeong , Lee Yunjin , Jeon Jin Yong
Published: December 2023

It was conducted to verify the psychophysiological restoration effect caused by the experience of the so-called Gugak soundscape, which is a combination of Korean natural VR soundscape contents and Korean traditional music, Gugak. Visual stimulation was provided through the VR CAVE
environment, and auditory stimulation was provided through 4-channel microphone recording and closed type headphones for immersive and practical experience. The subjects experienced the content in a comfortable capsule-shaped chair, and experienced the content three times a week for 6 weeks,
each time for 15 minutes. Psychological and physiological responses were measured before and after the experience in the 1st and 6th weeks and 4 weeks after all experiences. Through this, subjective evaluation scores such as mental health status and satisfaction, physiological response such
as HRV and EEG data were collected. The correlation among physical characteristics of the soundscape environment, subjective evaluation and physiological response was investigated, and through the parameters related to restoration, statistical verification of the effect of the experience was
conducted. The psychophysiological restoration effect and the persistence of the effect were investigated according to the long-term experience for 6 weeks.
2.5 dimensional sound field reproduction based on mode matching and equivalent sources considering primary reflections
Authors: Suzuki Yukika , Tsunokuni Izumi , Ikeda Yusuke
Published: December 2023

Many sound field reproduction methods using many loudspeakers (secondary sources) have been studied to reproduce a physically-accurate sound field. In our previous research, we proposed a pressure matching method using the modeled transfer functions of the secondary sources based on
the sparse equivalent source method (ESM). By modeling the sound field emitted from the loudspeaker, the number of measurement points required for pressure matching can be significantly reduced. Moreover, another well-known method of sound field reproduction is Mode Matching (MM). In the MM
method, the driving functions are derived such that the weight coefficients of the spherical harmonics are matched between the desired and reproduced sound fields. In this study, we proposed an implementation of the MM method based on the ESM considering the sound reflections and loudspeakers'
directivity. We estimate the spherical harmonic coefficients of the loudspeakers and sound reflections based on the superposition of equivalent sources. In the simulation experiments, we evaluate the reproduction accuracy achieved with the first-order sound reflections.
Static recording apparatus for soundscape analysis in Macau
Authors: Estadieu Gerald , Cheung Yin Yan , Pestana Pedro Duarte , Barbosa Alvaro
Published: December 2023

The concept of Soundscape was initially proposed to study the relationship between humans and their sonic environment. It has gathered momentum from academia to environmentalists and policymakers throughout the years. The study and characterisation of Soundscapes can be complex as it
tries to take a holistic and qualitative approach rather than simply quantifying sound pressure levels. This paper introduces a comprehensive Soundscape study process in an ongoing research project in Macao (China), a small territory (32.9 km2) and one of the most densely populated areas in
the world. The paper seeks to show a first version of a technical solution to systematically capture the local soundscape, analyse it, classify it, and ultimately deliver a dataset library and the intangible qualities of the environmental sound. This implementation, including technical documentation,
code, and sound library with strong labelling, is presented under an open-source license to encourage future collaborative research. Finally, the paper offers suggestions on further developing the apparatus to reach a systematic and near real-time soundscape analysis with the development of
a machine learning system.
Predicting Take-Off Noise, Sonic Boom, and Landing Noise of Supersonic Transport Aircraft Concepts
Authors: Kirz Jochen , Bartels Susanne , Bertsch Lothar , Can Ahmet Günay , Dietl Tobias , Ewert Roland , Gräbert Matti , Jaron Robert , Liebhardt Bernd , Nöding Michel , Plohr Martin , Schnell Samuel
Published: December 2023

In 2023, the German Aerospace Center (DLR) has launched the STORMIE (Supersonic Transport Open Research Models and Impact on Environment) project. Focus of the project is the prediction and minimization of environmental and human impacts of civil supersonic transport. Data generated
in the project will be used to inform national and European authorities in order to discuss certification standards for supersonic aircraft within the International Civil Aviation Organization's Committee on Aviation Environmental Protection (CAEP). In order to assess the environmental impacts,
representative civil supersonic business-jet and airliner concepts will be designed. This paper will present an overview of past and ongoing activities conducted at DLR to assess and minimize landing and take-off noise as well as the sonic boom of supersonic aircraft. Numerical methods at
different levels of fidelity are applied and will be complemented by listening tests of auralized simulation data in a later project stage. First noise-related activities within the STORMIE project are summarized.
Study on the relationship between the basic physical characteristics of ISO road surfaces and tyre noise
Authors: WADA Masayuki , OKADA Haruki , NAKAGAWA Ryouichi , MATSUOKA Hisayoshi , KIDERA Takafumi
Published: December 2023

As vehicle electrification progresses, the contribution and importance of tyre noise to Pass-by noise is increasing. In general, tyre noise level varies depending on the road surface and it is known that even on road surfaces that satisfy ISO10844 (Specification of test tracks for measuring
sound emitted by road vehicles and their tyres), coasting tyre rolling sound fluctuates by a few decibels. For that reason, the measurement uncertainty of tyre noise due to the difference in road surfaces has become unignorable. For further reduction of road traffic noise, it is necessary
to understand the relationship between basic physical characteristics related to road surfaces and tyre noise that contribute to measurement uncertainty. In this study, we constructed several road surfaces with different construction methods within the range of ISO10844 and investigated the
relationship between them. In this report, we show the results of our efforts, including knowledge that is not standardized by ISO10844.
Numerical and experimental investigation of a high-static-low-dynamic stiffness vibration isolator with tunable stiffness and damping
Authors: Shahraeeni Mehran , Sorokin Vladislav , Mace Brian , Ilanko Sinniah
Published: December 2023

Nonlinear vibration isolators that take advantage of negative stiffness elements can simultaneously meet the requirements of acceptable static deflection and frequency band of isolation and are thus superior to their linear counterparts. Incorporating electromagnetic elements into the
vibration isolator is a common approach to provide the required negative stiffness. Electromagnetic mechanisms are low-cost, tuneable, and operate without friction. Also, they can extract or dampen the energy of the host system through electromechanical coupling. Therefore, electromechanical
elements are ideal choices for designing multi-purpose vibration control mechanisms. In this study, three coils surrounded by arrays of permanent magnets are considered. When the system vibrates, their magnetic fields interact with that of a moving magnet attached to a rod supporting an isolated
mass. The electromagnetic properties of the proposed system are simulated using the finite element method (FEM) and experimental measurements are used to validate the numerical simulations. Different scenarios for a system consisting of three coaxial coils are considered and compared, including
powering the coils, open circuit coils, short circuit coils and coils shunted with an external circuit. Features of each case are discussed and general guidelines for designing a multipurpose vibration controller are given.
Numerical Prediction of Aerodynamic Noise for a Propeller-wing Configuration and an Investigation of Pitch Effect
Authors: Huang Guangyuan , Sharma Sidharath , Ambrose Stephen , Jefferson-Loveday Richard
Published: December 2023

Driven by the sustainable and eco-friendly vision of aviation, Distributed Electric Propulsion (DEP) technology has received much attention for its high aerodynamic efficiency. Simultaneously, lower noise emissions from DEP configurations are desired and therefore it is important to
investigate the aerodynamic noise features, which include but are not limited to the noise generation mechanism and the effect of propeller-propeller/wing interactions. This paper focuses on a numerical approach, which is suitable for industrial practice, for predicting the aerodynamic noise
of propeller-wing configurations. A generic DEP configuration is employed, consisting of a Mejzlik 2-blade propeller installed on the leading edge of a NACA0018 airfoil. A hybrid method of computational aeroacoustics has been performed in the present simulations, where aeroacoustics in the
near field is solved by coarse-grid compressible large-eddy simulations and then the acoustic far field is calculated by the Ffowcs-Williams Hawkings analogy. The influence of grid resolution is studied based on Pope's criterion M and satisfactory results are achieved at a moderate mesh count
as compared to the experimental measurements. Further simulations are conducted to investigate the effect of propeller pitch on the aerodynamic performance, noise generation and propeller-wing interactions.
Proposta de planilha para o cálculo de compensação ambiental facultativa como ferramenta de Educação Ambiental
Authors: Silva Cleyton Martins da , Iespa Ana Paula de Carvalho
Published: December 2023

Nos últimos anos observa-se os aumentos na utilização dos recursos naturais e dos impactos ambientais de origem antrópica. Nesse sentido, compreende-se a Educação Ambiental como essencial para o reconhecimento das responsabilidades e busca por soluções para as questões ambientais, tais como a necessidade de medidas de compensação ambiental. Desta forma, neste trabalho foi desenvolvida uma ferramenta para a Educação Ambiental, com o uso de planilhas eletrônicas para estimar as emissões de carbono e conversão em valor monetário, sugerindo o investimento deste em ações de compensação ambiental, permitindo ainda uma maior discussão das questões ambientais e o desenvolvimento de sentimento de responsabilidade individual e pertencimento ao meio ambiente.
Sustentabilidade como praxe pedagógica para Educação Profissional e Tecnológica (EPT)
Authors: Ineia Adriano , Ellesohn Ricardo Machado , Turchetti Rogério Corrêa
Published: December 2023

O presente trabalho trata de uma revisão sistemática sobre sustentabilidade como praxe pedagógica na Educação Profissional e Tecnológica. A proposta tem como foco apresentar resultados que permitam quantificar o presente assunto no âmbito pedagógico da EPT. Portanto, utilizaram-se duas bases de dados: Biblioteca Digital Brasileira de Teses e Dissertações (BDTD) e o Google Acadêmico, utilizando como descritores Sustentabilidade e Educação Profissional e Tecnológica. A partir da análise do material levantado é possível constatar que é fundamental compreender as potencialidades da temática sustentabilidade como praxe pedagógica, ainda mais se tratando na Educação Profissional e Tecnológica. Os autores tratam essa junção da sustentabilidade à EPT como prática assertiva, sendo capaz de desenvolver competências voltadas ao desenvolvimento sustentável e a formação de sujeitos que atuem de forma sustentável, resiliente e equitativa.
Gestão de resíduos sólidos: uma análise dos relatórios de gestão do IFCE e IFPI e suas práticas de sustentabilidade e Educação Ambiental no período de 2012 a 2022
Authors: Oliveira Egberto Batista de , Carvalho Denis Barros de
Published: December 2023

A Política Nacional de Resíduos Sólidos (PNRS), instituída pela Lei n.º 12.305/2010 no Brasil, tem como objetivo estabelecer diretrizes e metas para a gestão adequada dos resíduos sólidos. Este estudo busca analisar os PDI’s e Relatórios de Gestão do IFCE e IFPI dentro de uma perspectiva temporal de 2012 a 2022 procurando identificar as ações de sustentabilidade realizadas por estes dois Institutos e de acordo com a Lei n.º 12.305/2010 e Decreto n.º 5.940/2006. Constatou-se que os Institutos não possuem uma Política Ambiental implementada embora venham realizando algumas ações isoladas relacionadas à sustentabilidade, Educação Ambiental e à gestão de resíduos, conforme evidenciado em seus relatórios de gestão.
Síndrome de Tourette no Brasil: uma revisão de escopo
Authors: Santos Maria Luisa Simões , Gregorutti Carolina Cangemi , Lins Sarah Raquel Almeida
Published: December 2023

Introdução. A Síndrome de Tourette é um transtorno de tique com considerável prevalência na população mundial, mas que tem sido pouco divulgado e discutido na literatura. Objetivo. Compreender e analisar a realidade brasileira sobre as publicações relacionadas à Síndrome de Tourette. Método. Trata-se de uma revisão de escopo que utilizou o descritor “Síndrome de Tourette” nos Periódicos da CAPES, e que coletou informações referentes as características dos estudos e cujos dados foram organizados em planilhas e analisados descritivamente. Resultados. A maioria dos estudos são revisões de literatura, publicados há mais de 10 anos e que abordam sobre os aspectos biomédicos da Síndrome de Tourette. A maioria dos estudos foi publicada por profissionais da medicina, o que sugere uma importante lacuna no conhecimento sobre a atuação de outros profissionais da saúde, da educação e da assistência social em relação à pessoa com Síndrome de Tourette. Discute-se sobre a contextualização dos artigos e as lacunas identificadas que incluem a demanda pela abordagem dos impactos no cotidiano e a realização de estudos que envolvam ações práticas. Conclusão. Compreende-se a necessidade de investimento em novos estudos sobre a temática, para melhor conhecimento sobre o tema, sobre as práticas de manejo e para ampliação das discussões sobre a realidade da pessoa com Síndrome de Tourette.
The potential of biological control on invasive weed species
Authors: Kabashi Besarta , Massimi Mohunnad , Radócz László
Published: December 2023

Sorghum halepense is one of the invasive species in Europe. This study was made to identify the morphology of fungi on invasive weed species samples on the roots of Sorghum halepense. The samples were collected in the region of Debrecen. The experiment was conducted under laboratory conditions to determine the microscopic form of fungi. The samples were put on PDA and for identification of fungi is based on the morphological characteristics of the features and colonies of conidia that were developed in Petri dishes.
The examination of the culture revealed that the fungus from the root of Sorghum halepense was Aspergillus niger. Pathogenicity and the relationship between the fungus and Sorghum halepense are still uncertain so in the future pathogenicity tests and re-isolations from plants are very important steps.
Disease incidence of shot-hole disease of plum in two training systems
Authors: Molnár Csengőné Bianka
Published: December 2023

Of the foliar diseases of European plum, Wilsonomyces carpopilus is the most commonly occurring fungal pathogen. The aim of this two-year study was to investigate the susceptibility of ‘Čačanska lepotica’ plum variety to shot-hole disease (Wilsonomyces carpophilus) in two different training system with 4 x 1.5 m and 6 x 3 m tree spacings. The obtained results showed that the cultivar is susceptible to this disease and by the end of the vegetational period disease incident was above 50% in both years in both tree spacings. In 2018 disease incidence was higher in both spacing than in 2019, reaching almost 90% at the 4 x 1.5 m tree spacing plot. There were few significant differences between high and low density tree spacings. The results highlighted the importance of inoculum accumulation late in the season.
Investigation of the impacts of the by-product of sewage treatment on some characteristics of maize in the early growth stage
Authors: Kaczur Dávid , Moloi Makoena Joyce , Takácsné Mária Hájos , Tóth Brigitta
Published: December 2023

The use of sewage sludge on arable land has been widespread for many years. This by-product, treated as waste, can provide valuable nutrients to the soil, but the applied amount of sewage sludge to arable land is limited. The possibility of application of sewage sludge is essentially determined by the composition of the sludge. The goal of the experiment was to demonstrate that the physiological, morphological, and biochemical parameters of maize (Zea mays L. cv. Armagnac) linearly change with increasing concentrations of sewage sludge (25%, 50%, and 75% as m/m%). The experiment was set up in a glasshouse. The following parameters were investigated: plant height, relative chlorophyll content, photosynthetic pigments (chlorophyll-a, chlorophyll-b, carotenoids), and leaf proline and malondialdehyde (MDA) content, and PS II quantum efficiency in the 3-leaf stages of the plants. Sewage sludge applied in lower doses had a beneficial effect on the initial growth of maize. The relative chlorophyll content was significantly higher in all treatments compared to the control. There was no significant difference in the maximum quantum efficiency of PS II reaction centers among the treatments. In this experiment, different concentrations of sewage sludge treatments had different impacts on the MDA and proline content of maize leaves. The proline content was significantly higher in all treatments, while the MDA content did not change significantly compared to the control.
Review on the fatty acid profile and free fatty acid of common carp (Cyprinus carpio)
Authors: Maghfira Lativa Lisya , Stündl László , Fehér Milán , Asmediana Anis
Published: December 2023

Carp or ponty in Hungarian, is considered commercial freshwater fish, which is an adaptable species in both wild and cultured conditions. Carp has high nutritional value content, favorable taste, it is rich in protein, and low in saturated fat. The nutritional content in fish is composed of many chemical constituents and influenced by many factors. One of the components that its content may be different due to internal and external factors is fatty acids, which may vary depending on endogenous and exogenous factors. The endogenous or internal factors include the genetic, size, sexual maturity, and life cycle phase. While microclimate, water quality, quality of food or diet habit, and the amount of available food or starvation are considered as exogenous or environmental factors. Freshwater fish has the ability to convert essential fatty acid into long chain polyunsaturated fatty acid like AA, EPA, and DHA. Most results showed that palmitic acid and oleic acid were the dominant SFA and MUFA in carp both for wild and farmed carp in all seasons. The PUFA for wild carp was mainly dominated by DHA, while on farmed carp by LA. It confirmed that high LA content in farmed carp was related to the diet habit. The amount of lipid and FA were changed in line with the season. Even the statistical analysis showed no significant difference, but some studies showed a contrasting result. Moreover, most obtained results acknowledged that FA tends to decrease during the spawning period. The amount and composition of FA were affected by the total lipid content. The lipid must be broken down into simpler compounds such as FA or FFA for the metabolism of fish. The result of metabolism then transported into the utilising tissue and used as energy.
The analysis of ostrich chick vitality
Authors: Brassó Dóra Lili , Knop Renáta , Várszegi Zsófia , Komlósi István
Published: December 2023

Examinations on ostrich chick vitality can help to improve the effectiveness of Hungarian ostrich husbandry and hatching technology. The investigations were carried out on an ostrich breeder farm in Eastern Hungary. For the analyses, the Tona et al. (2003) scoring system was applied presenting eight main criteria (activity, feather, condition, eyesight, the condition of navel and leg, the amount of the remaining shell membrane and egg content, and the size and tenderness of the abdomen). Most chicks (98.08%) were vigilant and had clean and dry feathers. There was no difference between the average hatching weights between May and August but a decreasing tendency was shown during the laying season. The vitality total score was above 90 in each evaluated month and was not affected by the hatching month. Our results revealed that the vitality of chicks was not affected by either the hatching month (P=0.51) or the weight category (P=0.11). Neither the hatching weight of chicks and leg condition were correlated (P=0.79). Results showed that the Tona scoring system with small modifications can be well applied to ostrich chicks. Practical on-farm usage of the system can be suggested as an aid in day-old chick evaluation. After individual marking of chicks, the investigation of growth and culling rate could be carried out for more precise conclusions, involving more farms and laying seasons.
Karakterisasi Sabun Padat Berbahan Dasar Minyak Jelantah Dengan Penambahan Serbuk Daun Sirih Hijau (Piper Betle L)
Authors: Nugraheni Ika Kusuma , Rahman Sauqi , Ningsih Yuliana
Published: December 2023

Minyak jelantah adalah minyak limbah yang berasal dari tumbuh-tumbuhan yang digunakan sebagai minyak goreng. Minyak jelantah dapat dimanfaatkan kembali dengan proses pemurnian dan dimanfaatkan dalam pembuatan sabun dengan proses saponifikasi menggunakan basa (KOH atau NaOH). Berdasarkan hal tersebut dilakukan penanganan limbah minyak jelantah dengan pemanfaatan sebagai bahan baku pembuatan sabun padat. Tujuan dari penelitian ini adalah melakukan karakterisasi mutu sabun padat minyak jelantah dengan penambahan serbuk daun sirih hijau dan menganalisis kemampuan antibakterinya. Metode penelitian dilakukan melalui analisis ekperimental dengan variasi penambahan serbuk sirih dalam pembuatan sabun padat. Minyak jelantah sebagai bahan dasar dimurnikan dengan penambahan NaOH 30% serta penambahan bleaching earth. Sedangkan serbuk daun sirih diproses dengan penghalusan dan disaring dengan ukuran 500 mesh. Proses pembuatan sabun padat dengan penambahan asam stearat, propilen glikol, gliserin, etanol serta Tetra Etil Amina (TEA). Karakterisasi sabun padat dilakukan dengan pengujian yang meliputi parameterer kadar air, jumlah asam lemak, alkali bebas, asam lemak bebas, minyak mineral, stabilitas busa, uji keasaman (pH), dan uji anti bakteri. Berdasarkan hasil karakterisisasi yang dilakukan, nilai asam lemak bebas,  minyak mineral, stabilitas busa pada seluruh variasi sampel telah memenuhi SNI Sabun padat (SNI 06-3532-1994). Batas nilai alkali bebas tidak terpenuhi pada sampel dengan variasi serbuk daun sirih tertinggi, sedangkan nilai derajat keasaman (pH) menjadi meningkat hingga melebihi ambang batas dengan adanya penambahan serbuk sirih. Uji antibakteri menunjukkan semakin besar penambahan serbuk sirih, maka semakin baik dalam kemampuan antibakterinya.