bluuebunny/crossref_metadata_2025 huggingface dataset:
3D vibration modes estimation of complex-shaped structure by Phase-based motion magnification and DIC method
Authors: Kim Narae , Park Junhong
Published: December 2023

Knowing the 3D mode shapes of a structure is important in solving unwanted vibration and noise problems in mechanical systems. Accordingly, various analysis methods for estimating the vibration modes of complex-shaped structures have been proposed. However, it is difficult to attach
accelerometers to a complex-shaped structure, and to cover a large area, many accelerometers must be attached. So experimental verification of the mode shapes of an actual structure is insufficient. Therefore, the purpose of this study is to experimentally estimate the 3D vibration modes of
a complex structure using two cameras by Phase-based image magnification and DIC method. In addition, by using non-contact sensor such as a camera, it is possible to estimate the modes without affecting the mass or stiffness of the structure.
Need for international standards to evaluate airborne ultrasound emitted by high-intensity ultrasonic equipment
Authors: Takahashi Hironobu
Published: December 2023

Airborne ultrasound applications have been around for several decades and are still being actively developed. The applications developed in recent years include parametric speakers and airborne ultrasound haptic devices, which are becoming more familiar in our daily lives. One of the
characteristics of the recently developed applications is that the sound pressure of emitted airborne ultrasound is extremely large. Although airborne ultrasound cannot be perceived as auditory sensation, it is known that high-intensity airborne ultrasound is hazardous to us. To assess the
safety of airborne ultrasound and to evaluate the acoustic performance of airborne ultrasound applications, quantitative measurement is essential, however, the measurement procedures for airborne ultrasound have not been clear yet, and some matters are emerging. This paper describes the need
to standardize the measurement procedures for airborne ultrasound emitted from airborne ultrasound applications. It also presents the current matters that need to be resolved in the standardization.
Environmental controls of air-conditioned noise with the aid of the Psychoacoustics Perception Scale (PPS)
Authors: Ma Kuen Wai , Mak Cheuk Ming , Chung Fu Lai Korris , Wong Hai Ming , Kang Shengxian , Gao Lei
Published: December 2023

It is known that an air-conditioning system is an essential component of modern buildings for maintaining good indoor environmental quality. However, the adverse effect due to air-conditioned noise can offset its benefits. Although several noise indices such as Noise Criteria (NC),
Noise Rating (NR), Room Criteria (RC), and A-weighted equivalent continuous sound pressure level (LAeq) have been developed to assess the acceptability of indoor noise environments, the noise feature of the environments and its psychological impacts on the occupants are not comprehensively
evaluated. Psychoacoustics Perception Scale (PPS) is a psychometric tool to assess the psychological impacts about general judgment (Evaluation, E), sensitivity to the magnitude (Potency, P), and sensation of the temporal and spectral compositions (Activity, A) of noise on occupants. This
study aimed to evaluate the air-conditioning building environments by using the traditional noise indices, psychoacoustic metrics, and the PPS. The significant correlations were found between the objective and subjective data. The results of the study provided the useful knowledge on future
designs of the environmental controls of air-conditioned noise.
A Comprehensive Study of Broadband Absorption Performance and Scattering Coefficient Evaluation of Spiral Resonators with Soundproof Sidewalls
Authors: Jeon Jonghoon , Gu Kyunglae , Yi Gyu Young , Park Junhong
Published: December 2023

Resonators designed in spiral and helical shapes exhibit sound absorption performance in the lower frequency band. The absorption characteristics including frequency range and acoustical impedance can be controlled by adjusting the permittivity and permeability are dependent on the
length or dimensions of the resonator. As the helical structure is added, the absorption performance can deteriorate due to the change in the resonator geometry. The compliant wall trembles in response to changes in waveguide pressure, generating dissipation of sound energy. The resonator
is surrounded by a compliant wall to compensate for the absorption effect of the resonator. Acoustic properties were obtained using the equivalent impedance concept consisting of the acoustic surface impedance of the cavity, the helical structure, and the soft wall. The theoretical scattering
coefficients were compared with measurements obtained with the 4-microphone method using impedance tubes. In this study, the tunability of the length extension ratio of the helical structure was investigated by controlling geometric parameters (or boundary conditions of the outer wall of the
resonator). Keywords: scattering coefficients; compliant wall; helical structure
Dose error impacts on a collection of realistic dose-response curves based on a NASA sonic boom community noise survey
Authors: Doebler William J. , Ballard Kathryn M. , Vaughn Aaron B. , Parker Peter A.
Published: December 2023

The National Aeronautics and Space Administration (NASA) plans to conduct surveys of community response to quiet supersonic flight to collect dose-response data for international regulators. Previous models of noise dose versus annoyance response ignored uncertainty in the noise dose
experienced by survey respondents. This dose error causes attenuation bias and results in inaccurate dose-response relationships. The impacts of dose errors can be explored by introducing error into the dose estimates of a simulated community noise survey. The simulated population annoyance
response is determined by specific noise response characteristics, including the onset of annoyance intercept, rate of increasing annoyance, participant intercept variability, and response rates. This paper explores the effects of dose errors on notional populations created by perturbing the
noise response characteristics observed in participants in a recent NASA flight test, Quiet Supersonic Flights 2018 (QSF18). The QSF18-based population parameters were shifted up to ±20% to create the study populations. For the anticipated dose range of the X-59, changes to the onset
of annoyance intercept have the greatest impact on erroneous model results. Quantifying point estimate errors illustrates the impact of dose error, with errors up to 14 dB observed for a fixed high annoyance percentage.
Toward Airframe Noise Reduction for Passenger Aircraft
Authors: Yamamoto Kazuomi , Takaishi Takehisa , Murayama Mitsuhiro , Ito Yasushi
Published: December 2023

Airframe noise is one of the main noise sources of the latest passenger aircraft during the approach phase. To demonstrate noise reduction technology based on unsteady Computational Fluid Dynamics (CFD) and wind tunnel tests, JAXA conducted flight tests using the JAXA Experimental Aircraft
"Hisho" in 2016 and 2017 in cooperation with industries in Japan. The noise data obtained from flyover noise source measurements successfully showed consistent characteristics with the noise reduction designs for the flaps and the main landing gear. The noise measurement data from
the flight test 2017 were used to validate the wind tunnel tests and CFD used in the design phase. Subsequently, the research activities proceeded towards the research and development targeting regional jet aircraft, aiming for practical application in passenger aircraft. This paper overviews
these research activities toward developing airframe noise reduction technology for passenger aircraft.
An investigation of the contribution of vibration duration on subjective response to horizontal building vibration
Authors: Hayashi Kentaro , Matsumoto Yasunao , Yokoshima Shigenori , Higashida Toyohiko
Published: December 2023

As an evaluation method for evaluating the habitability to building vibration, the ISO 2031 series of international standards defines the VDV for transient vibration, in which the vibration duration is considered by time integration. The evaluation method for non-stationary-like vibrations
in the guidelines for the evaluation of habitability to building vibration of the Architectural Institute of Japan (AIJ) also specifies a method to consider the effect of vibration duration on the evaluation. In this paper, laboratory experiments using an electrodynamic shaker were conducted
to investigate the relationship between the subjective response regarding occupant habitability and the horizontal vibration of buildings caused by external vibration sources such as road traffic and railways. Binomial logistic regression analysis was used to quantify the effects of acceleration
magnitude and vibration duration on the exposure-response relationship. The comparison of models with different proportions of occurrence (cutoff values) of subjective responses showed different effects of acceleration magnitude and vibration duration.
Using acoustic camera technology on inspection of noisy vehicles in Taiwan
Authors: Hsieh Yi-Hui , Chang Wei-Chong , Ding Pei-Hsiou , Tsai Meng-Yu
Published: December 2023

In recent years, noise complaints on motor vehicles had shown an increasing trend and became an environmental concern issue in Taiwan. Since 2021, innovative acoustic camera technology used to inspect high-noise vehicles exceeding "Vehicle Noise Control Standard" would be
fined. There are 111 sets of acoustic camera equipment using in 21 counties and cities in Taiwan, and local government issued 4,099 fines to violating vehicle owners. This environmental policy has been supported by people living near major road with ninety percent satisfaction. Currently,
acoustic camera technology with sound radar adopted by some cities in France to locate noisy vehicles accurately and issue fines automatically. Array sound camera technology has been used to inspect noisy vehicles in Netherlands and Germany. Taiwan is the first country in Asia to use acoustic
camera technology conducting inspections and law enforcement against noisy vehicles. The sound camera technology system is mainly composed of high-speed camera equipment, sound level meter and license plate recognition system. Fixed systems are prior to set on specific road in hot spots of
public complaint to inspect and outlaw noisy vehicles. After implementation of acoustic camera technology in these years, some challenges need to overcome. First, people doubt with accuracy and fairness of law enforcement equipment. Second, noise judgment of multi-source vehicle with law enforcement.
To improve accuracy of law enforcement and multi-sound source vehicle noise judgment, technology of combining sound photography with array microphones is developing in Taiwan. In the future, we plan to conduct research on multi-source vehicle noise judgment technology to improve inspection
efficiency and ensure a peaceful environment.
How to ensure reliable noise calculations with Cnossos-EU
Authors: Hauge Leo Heggem , Evensen Karen Brastad , Olsen Herold
Published: December 2023

The paper will discuss how to use the Cnossos-EU model in a consistent way across different users and software tools. This is based on a study related to implementation of Cnossos-EU in Norway. In the study a noise mapping task was given to two independent consultancy firms with long
experience in the field. For some areas, the results show large differences between the two, up to 10 dB and more, even when the same method and same software tool was used. Comparisons revealed that different understanding of input data, different parameter settings in the calculation, and
different company practices could explain the differences in the results. The study revealed a clear need for guidelines to ensure common assessment of noise mapping tasks. The paper will describe user guidelines to overcome this kind of problem in context of Cnossos-EU calculations. The guidelines
are aimed for the Norwegian consultant industry.
Development of higher back-pressure application of cooling fan test plenum per ISO 10302-1
Authors: Kimizuka Ikuo
Published: December 2023

International standard, ISO 10302-1 for measuring the airborne noise of individual fans (air-moving devices) for cooling information technology and telecommunications equipment, is being revised. While the existing test specification limits the maximum back pressure applied to the fan
under noise measurement to 750 Pa, this revision attempts to cover up to 3000 Pa depending on the size of the test plenum. This paper describes the background to the specification changes and various technical studies.
Factor affecting dynamic feeling of vehicle sound related to firing-order component and its effect
Authors: Lew Dongkyu , Cha Suho , Shin Sung-hwan
Published: December 2023

As consumers' expectations for the perceptional feeling of vehicles increase, the studies on sound design to improve the dynamic feeling have been actively conducted. The purpose of this study is to propose relevant factors to improve dynamics without reducing pleasantness. To this
end, subjective tests were conducted to evaluate dynamic and comfortable feelings on the noises during the acceleration of two comparison vehicles. A factor based on the TNR (tone-to-noise ratio) of ISO7779, TNRorder was extracted that could represent the feature of tonality of non-stationary
signals. A vehicle having high TNR order related to the first firing-order exhibited a strong dynamic feeling. It was also investigated that dynamic feeling could be increased after changing the TNRorder of the first- and second firing order components of the test vehicle through subjective
test.
Transferring sound-related expertise into urban planning and design practice on a project-by-project basis
Authors: Maag Trond , Anderson Sven , Gisladottir Arnthrudur
Published: December 2023

This article explores the transfer of sound-related expertise from academic and research contexts into urban design and planning practice. This is a complex task, and even in projects with a specific focus on sound and noise, good design intentions are difficult to sustain through multiple
project stages, from strategic definition and master planning through to the building permit. Planners and developers must adhere to their interpretation of best practice, while such knowledge is rarely on hand. Similarly, noise regulations provide little assurance that unfavourable decisions
made in early planning stages can be rectified later on. Accordingly, the acoustic environment remains a fragmented topic, and achieving sound- and health-related objectives is challenging. This article outlines appropriate formats through which urban sound planners can support planners and
developers using an approach of communication, analysis, walking, and securing value and legibility. Drawing from the authors' experience, this approach can support various urban practitioners in becoming aware of how their work both consciously and unconsciously shapes the urban acoustic
environment and determines how people engage within public spaces. The article questions how to curate sound-related knowledge transfer on a contextual, project-by-project basis and illustrates what such a procedure might look like for projects that evolve over several years.
Current status and good examples of airport environmental measures focusing on community coexistence in Japan
Authors: YAMAMOTO Ryo
Published: December 2023

JCAB explains the status of community engagement in recent years, taking as an example the development of over-the-city flight routes at Haneda Airport, Japan's largest airport. In order to let as many people living in areas where the impact of noise as possible know about the necessity
of functional enhancement of Haneda Airport and measures to realize it, JCAB not only has provided information, through an appropriate combination of open house type two-way dialogue explanations and various public relations, but also actively disseminated and widely shared dialogue content.
In addition, introduce good practices for environmental measures and redevelopment projects that make use of the privatization of a state-manage airport.
Finite element analysis of sound fields in the corridors of the hospital ward: Investigation on installing patterns of sound absorbing materials
Authors: Kinjo Yuto , Tomiku Reiji , Okamoto Noriko , Otsuru Toru
Published: December 2023

In this paper, using the time-domain finite element method (TDFEM), an effective installation pattern of sound absorbing materials in corridors of the hospital ward is investigated. First, several models with different installation patterns of sound absorbing materials are analyzed
by TDFEM. Next, spatial distributions of the squared sound pressure, the sound pressure level and the speech intelligibility index are calculated in each model. As a result, the amount of decrease of the sound pressure level by installing sound absorbing materials on the ceiling and part of
the wall in case that room average (α¯) equals 0.18 is larger than those by installing sound absorbing materials on the ceiling in case that α¯ = 0.20. Finally, several models with different installation patterns of sound absorbing materials, of which is the same, are
analyzed by TDFEM, and compared among the amount of decrease of sound pressure levels in each condition.
Wind Noise Estimation Method in Low-Frequency Sound Measurement in Windy Outdoor Environment
Authors: Kamiakito Noboru , Shimura Masayuki , Osafune Toshikazu , Nomura Takashi , Hasebe Hiroshi , Iwabuki Hiroshi , Ikeya Kimikazu
Published: December 2023

It is generally known that low-frequency sound is affected by natural winds when measured on-site. In this paper, the estimation method of wind noise by wind tunnel and outdoor natural wind has been examined step by step. Firstly, wind tunnel experiments were conducted to confirm the
relationship between wind velocity time average values and turbulence intensity, and to create the estimation fornula. Secondary, the field experiment was conducted using a low-frequency sound generator as a sound source, and the different results between the wind tunnel experiment and outdoor
experiment were discovered. Then, we accumulated the field data in different roughness divisions and tried to create the wind noise estimation fornula at each point. As a result, we considered the different results according to the roughness division and obtained the results that it is possible
to estimate the wind noise by using the proposed estimation fornula.
Complex Source Distributions in Wave-based Virtual Acoustics
Authors: Bilbao Stefan
Published: December 2023

In the typical scenario in time-domain wave-based acoustics, the solution to the acoustic wave equation is approximated over a three-dimensional volumetric grid using a time stepping method. In the setting of very large simulations, the grid is normally assumed to be regular (e.g. Cartesian)
so that massive parallelism may be exploited. One difficulty has been in representing source distributions that do not conform neatly to a regular grid. Using a Fourier-based optimisation procedure in the wave vector domain, it is possible to represent arbitrary source distributions in a flexible
way over a pre-defined collection of grid points. Such a methodology is independent of the particular choice of simulation method and depends only on the regularity of the grid. In this paper, approximations to various simple distributions, including the line source and piston, are examined,
with regard to accuracy, rotation of the distribution relative to the grid, and the size of the point cloud used to represent the source. Numerical results are presented.
A numerical study of the duct geometry effects on the aerodynamics and aeroacoustics of ducted propellers
Authors: Cantos Sinforiano , Wu Han , Ma Zhida , Zhou Peng , Zhang Xin , Zhong Siyang
Published: December 2023

Ducted propellers show large applicability in urban air mobility applications due to their operational safety, increased aerodynamic performance and noise reduction potential. In this work, we study the effect of the duct's lip design on the aerodynamics and aeroacoustics of ducted
propellers in hover with numerical simulations, which are validated with experiments. Steady numerical simulations were conducted first to efficiently evaluate the impact of the lip design on the aerodynamic performance. The results show how the design of the lip affects the uniformity of
the incoming flow to the propeller and the pressure distribution on the duct. Based on these results, an improved lip geometry is proposed, whose noise generation is investigated with delayed detached eddy simulations and the noise radiation to the far field is computed using the integral
solution of the Ffowcs-Williams and Hawkings equation. The experimental results show reasonable agreement regarding thrust generation and far-field noise. The spectrum and directivity of the aerodynamic noise are compared, and the primary noise sources are identified in the leading edge and
tip of the propeller.
Eigenvalue analysis and impact response analysis for T-shaped structures with new acoustic black hole including residual thickness supported by nonlinear concentrated springs
Authors: Yamaguchi Takao , Tanaka Tomohiro , Fujinuma Ryoichi , Maruyama Shinichi , Kamio Chihiro
Published: December 2023

This paper describes numerical analysis using FEM with Model Strain Energy Method for structures having a T-shaped cross section supported by nonlinear concentrated springs under impact load. An edge of the rib plate in the T-shaped structure has an Acoustic Black Hole with residual
thickness. A viscoelastic damping layer is covered on the black hole. Finite element for the nonlinear springs with hysteresis are expressed and are connected to the T-shaped structures modeled by linear solid finite elements in consideration of complex modulus of elasticity. We calculated
modal loss factors and transient responses using eigenmodes including coupled motions between the nonlinear springs and the T-shaped structures. From the dominant modes and the impact responses, we clarified effects of the black hole with residual thickness on the nonlinear damped responses.
By adding the black hole to the structures, modal loss factors increase. Higher modal loss factors are obtained due to set the residual thickness. As the amplitude of the impact force, the responses become complicated due to the nonlinearity, and include more super harmonic and subharmonic
components. These nonlinear components are reduced by adding the black hole. The less nonlinear components are given due to set the residual thickness.
A measurement system for the assessment of the effectiveness of sound-insulating multilayers against structure-borne excitation: design, prototyping and validation
Authors: Bertolini Claudio , Ruggeri Giulio , Galante Mariano
Published: December 2023

This paper proposes a measurement system to assess the effectiveness of sound-insulating multilayers against structure-borne excitation, meant to complement the well-known and established systems used in the automotive field for airborne excitation. The system consists of a shaker,
a frame connected to it and a plate clamped along its edges to the frame. When the frame is put into vibration by the shaker, the plate radiates noise into a small anechoic cabin where microphones are positioned. This layout intends to mimic the noise radiation from an automotive body panel.
The development of such a system, in spite of its simplicity, presents non-trivial aspects, such as the design of a frame sufficiently rigid not to have modes in the frequency range of interest and the definition of a metric to evaluate the effectiveness of an acoustic multilayer in a robust
way based only on SPL measurements. The paper describes how these challenges were overcome, using topological optimization to design a frame made with magnesium suitable for tests up to about 1kHz and FE simulations to define a robust assessment metric by placing the receiving microphones
at a fixed distance from the plate and at positions corresponding to integration Gauss points. Besides the design, the paper describes also how the system was prototyped and eventually validated.
Numerical analysis of the effect of trench on indoor vibration adjacent to railway ground line
Authors: Wu Yubin , Wu Yanan , Song Ruixiang , He Lei , Wu Qiong
Published: December 2023

By establishing a 3D finite element numerical simulation analysis model of railway-soil-trench-building, the accuracy of the simulation analysis model is verified using on-site measured data of surface vibration attenuation law. Install vibration isolation trenches with different depths
at different locations between the building and the railway, and analyze and compare the impact of indoor vibration in different situations. The results indicate that; The surface vibration caused by railways attenuates rapidly around 30m~76m from the line, and then shows a slight amplification
trend around 120m. The surface vibration near the railway is mainly concentrated in the range of 15-90Hz; The vibration reduction effect of trench on different indoor rooms in buildings varies greatly. By optimizing the parameters of trench, the average indoor vibration reduction effect can
be close to 5dB, and the vibration reduction effect of trench at different positions varies greatly. The increase in trench from 6m to 12m increases the indoor vibration isolation effect.
Application analysis of restoring force surface method, detection of non-symmetrical pretension of cylindrical test-specimens
Authors: Vehovszky Balázs , Bohus Dávid , Gazdagh Zoltán , Eichinger Benjamin
Published: December 2023

In classical linear dynamics, the modal analysis or transfer function measurement gives a very good bases to understand dynamics of structures, however, in other cases nonlinear testing methods - like Restoring Force Surface (RFS) method - can be used to detect nonlinear characteristics.
RFS works with a pushplate-structure-pushplate measurement setup, where inappropriate preparation of the setup, e.g. uneven pretension, may cause highly erroneous results. A detailed analysis is described in this paper for RFS measurement of cylindrical samples, where evaluation was made in
the first compression resonance. Beside presenting the measurement principles, the non-uniform pretension as well as other influencing effects are detailed, and an optimized way of execution is proposed for this measurement method.
Integration of smart city planning in noise assessment and its benefits
Authors: Kwok May Han Grace , Ho Ka Hou Karl , Lam Hang Yi , Man Yi Hang Cathy , Wong Kin Man Raymond
Published: December 2023

Smart cities are increasingly incorporating various technologies and data sources as a key aspect of their sustainability initiatives. Environmental impact assessment is currently the major method to ensure the sustainability of new developments. In particular, environmental noise has
been shown to have negative impacts on both human health and wildlife. Therefore, noise monitoring and reduction are the important aspects of smart city planning. This paper discusses the various ways in which smart cities can integrate noise monitoring and assessment into their sustainability
initiatives, including the use of sensors, data analytics, and citizen engagement. By leveraging these tools, smart cities can create a more comprehensive understanding of noise pollution levels and patterns, allowing them to make informed decisions and improve the overall quality of life
for their residents. Additionally, by engaging and easing the industry in the process of monitoring and assessment, smart cities can help create healthier, more livable, and more sustainable communities for all. A case study of Web-based Traffic Noise Assessment Tool (Web-NAT) commissioned
by Environmental Protection Department (EPD) of HKSAR providing a cloud-based platform that streamlines the noise modeling and impact assessment is also investigated.
The effects of ultrasound exposure with regard to the existing TVLs - a literature review
Authors: Radosz Jan
Published: December 2023

Noise is defined as any unwanted sound, and the health effects of noise have been well documented. Exposure to high levels of sound pressure can lead to hearing loss, tinnitus, and other health problems. Recently, there has been increasing concern about the potential health effects
of exposure to ultrasound. Many countries have included ultrasonic noise on the list of factors hazardous to health in the working environment. Even though the frequency range above 20 kHz has been studied, there is not enough information regarding how it affects the human body. In addition,
there are not any international standards for assessing ultrasonic noise at the work stations. While recent studies have helped advance the knowledge base in this area, they are still missing a considerable amount of data. This includes research into possible health consequences and improved
dosimetry.
Auditory impression of amplitude-modulated vehicle horn sounds and their detectability in noisy environment
Authors: Takada Masayuki , Goto Kanji
Published: December 2023

Vehicle horn sounds, due to their high sound pressure levels, induce negative psychological reactions in listeners, especially pedestrians. In order to reduce such negative effects, a horn sound with a lower sound pressure level is desired. At the same time, a horn sound should be easily
perceived by drivers, considering its use on busy roads. The amplitude-modulated horn sound may help to solve these problems. Therefore, we synthesized amplitude-modulated horn sounds, and conducted psychoacoustical experiments to investigate the relationship between the acoustic characteristics
and the perceived quality of these sounds. The results showed that stimuli with shallower modulation depths were less unpleasant than those with deeper modulation depths, and stimuli with modulation frequencies below 40 Hz suppressed auditory unpleasantness more than those with higher modulation
frequencies. To confirm their effectiveness for detection in noisy conditions, stimuli with different signal-to-noise ratios were created by combining the amplitude-modulated horn sound and road traffic noise. The amplitude-modulated horn sound in road traffic noise was detected even in conditions
where the signal-to-noise ratio was 3 dB lower than when the horn sound was not amplitude-modulated. The results indicate that amplitude-modulated horn sounds have the potential to improve the sound environment around roads.
Relationship between noise and cavitation at various cavitation numbers in fan type inducer blades of a centrifugal pump
Authors: Utsumi Haruto , Nakayama Sota , Ejiri Shinichiro , Miyabe Masahiro
Published: December 2023

Cavitation is one of the biggest problems in the industrial centrifugal pumps because it causes serious vibration and noise. So, it is demanded for the pump manufacturers to solve such problems due to cavitation before delivering products to the site. Hence, the experiments were conducted
to establish a practical technique for predicting the occurrence, form, and erosion risk of cavitation by sound measurements outside of pipes. A centrifugal pump with a fan type inducer was operated to measure noise at various cavitation numbers and flow rate. The visualization test of the
inducer was also conducted to identify the cavitation form. In addition, the paint erosion test was also conducted to estimate the risk of cavitation erosion occurring for the inducer. The relationship among noise, cavitation form, and erosion risk was investigated in detail.
Stability Analysis of Graphite Circumferential Seal Considering Perturbation
Authors: YE Jinxin , MENG Jinlong , HU Lanqing , XU Junbo , LU Chen , YAN Yutao
Published: December 2023

With the rapid development of aviation engine technology, the performance requirements for sealing systems under harsh operating conditions are also increasing. This article focuses on the graphite circumferential sealing system of an aircraft engine, and analyzes the structure and
stress of the graphite circumferential sealing system under the influence of sealing runway vortex, sealing gas, and structural and operating parameters. The graphite circumferential sealing system is simplified as a radial vibration model of spring damping mass, and the dynamic equation of
the graphite circumferential sealing system under coupled disturbance is established. Based on the theory of motion stability, the state space equation and equilibrium point of the sealing system under decoupled disturbances were solved, and the displacement response, axis trajectory, and
other dynamic behaviors of the sealing ring and sealing runway were obtained through numerical simulation. The operation state and stability law of the graphite circumferential sealing system under disturbances were analyzed. The research results provide guidance for the optimization design
of graphite circumferential sealing systems. Keywords: graphite circumferential seal, perturbation, dynamic characteristics, seal
A importância do poder de polícia na fiscalização de trânsito e a atividade de inteligência como ferramenta no combate à direção sob a influência de álcool
Authors: Bail Omar , Lazarotto Adriano Cristiano
Published: December 2023

Este estudo aborda a importância do poder de polícia na fiscalização de trânsito, destacando seu papel crucial na promoção do interesse público em benefício da coletividade e a utilização da inteligência policial para o planejamento e tomada de decisão. Desde os primórdios da convivência humana em sociedade, a necessidade de regular ações coletivas em prol do bem da comunidade tornou-se evidente. Leis foram elaboradas para estabelecer direitos dos cidadãos, sendo compatíveis com o bem-estar social e não impedindo a consecução dos objetivos públicos. O poder de polícia é uma prerrogativa da Administração Pública, empregada tanto na prevenção (polícia administrativa) quanto na repressão (polícia judiciária), baseada no princípio da Supremacia do Interesse Público. O poder de polícia, no contexto do trânsito, é exercido pelas Polícias Militares, que atuam na preservação da ordem pública, tanto em âmbitos administrativos quanto judiciais. O consumo de bebidas alcoólicas e a condução de veículos automotores representam uma combinação perigosa que aumenta substancialmente o risco de acidentes de trânsito, afetando a segurança pública e apresentando-se como uma relevante questão de saúde pública. O Brasil implementou leis para desencorajar esse comportamento, cuja aplicação é garantida por meio de uma fiscalização efetiva. A inteligência policial desempenha um papel crucial no combate aos crimes de trânsito, permitindo a identificação de padrões e tendências, bem como a identificação de áreas críticas para atuação. A integração e o compartilhamento de informações entre as agências de segurança pública são essenciais para a eficácia da inteligência policial. O artigo também destaca a importância da busca de informações em fontes públicas, como endereços de estabelecimentos que vendem bebidas alcoólicas e locais de estacionamento de veículos, tanto digitalmente quanto por meio de observações no campo. Um planejamento eficaz e operações coordenadas de fiscalização são essenciais para a execução direcionada e precisa no cumprimento das leis de trânsito.
Efeitos adversos da imunoterapia com IL-2 em pacientes com Câncer
Authors: De Figueiredo Neto Carlos Lula , Medeiros Artur Victor Cavalcante , Ferreira Yuri Taveiros , Inocêncio Neto Aloísio José , Reis Hugo José Porfírio
Published: December 2023

A Interleucina 2 (IL-2) é uma substância com efeitos imunoestimulantes e imunossupressores usada no tratamento do câncer. No entanto, o seu uso pode causar diversos efeitos colaterais, como febre, calafrios, fadiga, náusea, vômito, astenia, edema, dor torácica, prurido e elevação dos níveis de creatinina sérica. Doses mais altas de IL-2 podem resultar na síndrome de vazamento capilar.
Evaluation of the impact of hemotransfusion on hospitalization length and complications in patients with non-variceal upper gastrointestinal bleeding
Authors: Lora Joao Felipe Bernardi , Tafarel Jean Rodrigo , Roth Maria Julia de Moraes Campos , Bernardelli Rafaella Stradiotto
Published: December 2023

Background: Upper gastrointestinal bleeding (UGB) is a common emergency associated with high morbidity and mortality. It can be caused by various factors, including peptic ulcers and vascular lesions. The decision to perform blood transfusion in stable UGB patients is still controversial, with more restrictive strategies showing better outcomes. Methods: A retrospective cohort study reviewed 1433 medical records of non-variceal UGB patients in a Brazilian tertiary care setting. Patients were divided into groups based on whether they received blood transfusion or not. Patient characteristics, laboratory values, procedures, and outcomes were analyzed. Logistic and linear regression models were used to assess the association of blood transfusion with complications and hospital stay. Results: Blood transfusion was associated with increased hospitalization length (p<0.001), higher rebleeding rates (p<0.001), and greater clinical severity. However, no association with worse renal outcomes was observed (p=0.203). Adjusting for clinical severity (Glasgow-Blatchford score) reduced the significance of the association with hospitalization length. Conclusion: Blood transfusion in stable UGB patients may serve as a marker of severity, associated with longer hospital stay and increased rebleeding rates. It does not appear to have a direct causal relationship with worse renal outcomes. The study suggests that clinical severity may play a pivotal role in outcomes, as indicated by the association with Glasgow-Blatchford score.
Dietary restriction inhibits bone formation in alveolar bone modeling and remodelling
Authors: Garat Juan Abel , Romano Silvia , Odstrcil Ana Aybar
Published: December 2023

Objective: Methods: Balb/C mice weaned at the age of 21 days were assigned to one of the following groups: control group fed a regular hard diet ad libitum (food consumption was measured daily), and dietary restricted group (DR) received 75% of the amount of food consumed by the respective control mice the previous day.  Body weight of all animals was recorded throughout. Mice were euthanized in groups of ten at 25 and 60 days of experience. Mandibles were dissected, descalcified in EDTA and embedded in paraffin. Buccolingual sections of the mesial root of the first lower molar were stained with hematoxylin-eosin and submitted to histomorphometric studies.  Results: At 25 days, DR mice shows bone formation values lower than control animals for modeling and remodeling sides, coupled to an increase with bone at rest values in the modeling side. At 60 days, DR mice shows bone formation values lower than control animals in the modeling side linked with a similar increase in values corresponding to bone resorption and bone at rest. In the remodeling side, no differences in bone formation were observed between control and DR mice. However, high bone resorption and a decrease in bone at rest areas were observed. Conclusions: Dietery restriction impaires bone formation in physiologic alveolar bone modeling and remodeling.
Importância do tratamento e documentação de imagens de tomografia computadorizada
Authors: Saraiva Raimundo de Sousa , Parente Filho Lívio William Sales
Published: December 2023

É muito importante se fazer um exame tecnicamente bem feito, saber posicionar o paciente, usar os parâmetros de controle, protocolos, meios de contraste, ter conhecimentos de anatomia, patologias, tudo isso que todos os profissionais devem conhecer. Mas é importante à fase final, ou seja, o desfecho do exame, então deve-se atentar ao tratamento da imagem, para depois documentar, que e a geração do filme. Cada exame de Tomografia Computadorizada é orientado de acordo com as indicações clínicas e com o pedido do médico solicitante. Por isso, a documentação de conter as imagens que melhor descreva a doença em investigação. Dentre as varias formas de registro do exame de Tomografia Computadorizada destaca-se a impressão a laser da imagem em filme, impressão em papel (A3) ou gravações digitais (CD, DVD, etc.). Mas a que prevalece são os filmes. Este trabalho tem como objetivo geral, realizar uma revisão de literatura sobre a importância do tratamento e documentação de imagens de tomografia computadorizada, enfatizado sua implementação, não como uma obrigatoriedade, mas como um auxílio aos profissionais das técnicas radiológicas na finalização dos exames de tomografia computadorizada, o que posteriormente auxiliará também os profissionais médicos em suas tomadas de decisões.
Avaliação dos impactos da obesidade infantil na saúde do adulto: uma revisão sistemática
Authors: De Resende Gabriella Costa , Castilhos Estela Macias , Ravazi Gabriela Franzin , Magalhães Paula de Carvalho , Menegassi Thaís Veiga , Rodrigues Mariana Rocio , De Resende Isabella Costa
Published: December 2023

A obesidade é considera um problema de saúde pública global. Esse distúrbio nutricional é prevalente na infância, possui etiologia multifatorial e ocasiona diversos impactos negativos para a comunidade. As consequências ocasionadas pelo excesso de peso nas primeiras fases da vida podem evoluir até a idade adulta.  O objetivo desse estudo é avaliar os impactos da obesidade infantil na saúde do adulto. Foi realizada uma pesquisa nas bases de dados virtuais Scielo e Pubmed, utilizando palavras-chave e delimitando critérios de inclusão e de exclusão. Encontrou-se 62 artigos, porém apenas 41 satisfizeram os critérios estabelecidos e foram utilizados no estudo de revisão. Dentre as complicações da obesidade infantil encontradas, é importante citar as doenças cardiovasculares, hipertensão, dislipidemias, disfunções renais, tumores malignos, alterações musculoesqueléticas. Assim, foi estabelecida uma relação entre a obesidade infantil e complicações na saúde do adulto.
Tratamentos conservadores da polpa e sua aplicabilidade: revisão de literatura
Authors: Rangel Lorena Souza , Santos Ana Paula Feitosa , Reis Cind Lauren Araujo , Andressa Cristina dos Santos  , Ribeiro Yuri Jivago Silva , Ribeiro Michael Ranyeri Garcia , Carvalho Roberta Furtado , Gritti Giovanna Cunha
Published: December 2023

A terapia pulpar de natureza conservadora é um tipo de abordagem terapêutica cujo objetivo é preservar a integridade do conjunto pulpar lesionado, facilitando o reparo do tecido pulpar. O presente artigo tem como finalidade abordar, através de uma revisão de literatura, os tratamentos conservadores da polpa dental disponíveis na busca da preservação da vitalidade pulpar, considerando suas indicações, materiais e técnicas utilizadas para este fim. A pesquisa bibliográfica foi desenvolvida nas bases de dados SCIELO, PUBMED e LILACS, onde buscou-se por artigos publicados no perído de 2015 a 2023, através das palavras-chave: Tratamento conservador, Endodontia, Hidróxido de Cálcio, Pulpotomia. A busca dos dados resultou em  artigos para compor  os resultados do referente estudo. A preservação da vitalidade pulpar é de fundamental importância, pois a polpa mantém sua atividade funcional, dentre as técnicas utilizadas a pulpotomia tem se destacado com um bom prognóstico. O sucesso das abordagens conservadoras está estreitamente ligado à avaliação clínica das condições biológicas da polpa, à habilidade do profissional e aos materiais utilizados.
Experimentação farmacológica in vitro: explorando novas fronteiras no desenvolvimento de fármacos
Authors: Silva Beatriz de Castro , Lunardi Rafael André , Costa Amanda Letícia Santos , Da Costa Luísa Taynara Silvério , Baltazar Pedro Castro , Dos Santos Lucinéia
Published: December 2023

Os testes in vitro atualmente em ascensão se apresentam como uma importante ferramenta para o desenvolvimento de pesquisas farmacológicas que visam o desenvolvimento de novos medicamentos. Isto porque, a utilização de animais em pesquisas farmacológicas tem sido questionada desde longa data. Inclusive, há um compromisso da comunidade científica mundial em seguir o princípio dos 3Rs. O primeiro “R” refere-se a Reduction (redução), o segundo “R” a Replacement (substituição) e o terceiro “R” a Refinement (refinamento). Assim, de acordo com o princípio dos 3Rs é necessário refletir sobre a necessidade de se reduzir o número de animais nos procedimentos experimentais e sempre que possível substituir o seu uso por métodos in vitro. Considerando que os anti-inflamatórios se apresentam como uma das classes mais comercializadas de medicamentos no mundo, e tendo como propósito contribuir para a redução do número de animais nas análises experimentais, este estudo teve como objetivo realizar uma revisão bibliográfica a respeito das metodologias realizadas in vitro que foram empregadas em ensaios de avaliação da atividade anti-inflamatória, e que já tiveram seu uso validado por meio da literatura.
Biomarcadores tumorais de Câncer Colorretal: breve revisão bibliográfica
Authors: Rosa Nathália Ritter , Dos Reis Julia Ferreira , De Oliveira Luiz Fernando Ferreira , Do Nascimento Gabriela Oliveira , Santos Joyce Nascimento
Published: December 2023

O câncer colorretal é o terceiro tipo de câncer mais incidente no Brasil e no mundo, e é uma das causas de morte em pessoas com menos de 70 anos. A incidência de casos em pacientes com idade menor que 50 anos aumentou, e com isso, a necessidade de fazer o rastreamento ainda mais precoce dessa doença, a fim de obter melhor prognóstico. As alterações genéticas, histológicas e morfológicas somadas tornam possível a detecção de pólipos pré-cancerosos, corroborando diagnóstico e tratamento precoces. O presente estudo é uma revisão de literatura qualitativa com finalidade de identificar biomarcadores promissores do câncer colorretal. Os tumores malignos se diferenciam dos tumores benignos pela presença de fator cancerígeno nesses. O tipo mais comum de câncer colorretal é o adenocarcinoma, desenvolvido a partir de células epiteliais. O sarcoma é outro tipo de câncer colorretal que se desenvolve a partir de tecido conjuntivo. Os biomarcadores MMP9, EFGR e PLAU são os mais específicos para o câncer colorretal. Os indicadores biológicos são importantes na educação, conscientização populacional, diagnóstico, tratamento e prevenção da doença. Uma abordagem individualizada, com base em biomarcadores, pode reduzir morbimortalidade e avançar no sentido de melhores prognósticos aos pacientes acometidos por essa doença.
Características epidemiológicas das vítimas de Escorpionismo na Bahia
Authors: Magalhães Bárbara Bernardes , De Oliveira Filha Elisamar Ramos , Moreira Eger Claudio Campos , De Oliveira Gessíca Ferreira , Andrade Gustavo Bittencourt Coutinho , De Souza Jordana Brandão , Couto Lis Ribeiro , Coutinho Tarcísio Nascimento , Costa Davi Tanajura , Viana Irineu dos Santos
Published: December 2023

Objetivo: Investigar o perfil epidemiológico dos casos de escorpionismo na Bahia. Métodos: Esta pesquisa consistiu em uma revisão integrativa da literatura utilizando as bases de dados MEDLINE e LILACS, através do Portal Biblioteca Virtual em Saúde (BVS) e PubMed. O período da análise compreendeu os anos 2013 a 2023. Foram escolhidos 10 estudos, distribuídos da seguinte forma: 40% pesquisas retrospectivas, 30%  estudos observacionais descritivos, 10% clínico-epidemiológico, 10% estudos transversais e 10% estudos ecológicos. Discussão: Há uma associação direta e proporcional entre a incidência de casos de escorpionismo no Brasil e territórios com fragilidades sanitárias. Considerações finais: A maioria dos estudos analisados concorda que, o sexo feminino é o mais acometido por acidentes escorpiônicos. A faixa etária de acometimentos variou entre os estudos, entretanto, predominou vítimas com idade entre 20 a 59 anos. Os maiores registros ocorreram em ambiente domiciliar, em populações autodeclaradas pardas.