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This study aims to analyze and compare the cabin noise levels of the Mitsubishi Destinator Ultimate variant (sunroof) and Exceed variant (non-sunroof) under various driving speed conditions. Measurements were conducted using a Sound Level Meter inside the cabin at idle, 10, 30, 50, 70, 90, and 100 km/h. Results indicate that the Ultimate (sunroof) variant consistently produces higher noise levels than the Exceed (non-sunroof) variant across all speed variations. The largest noise difference was recorded at 100 km/h at 6.50 dB, while the smallest occurred at idle at 0.05 dB. Noise levels in both variants increased significantly with increasing speed, with the sunroof variant reaching 70.00 dB and the non-sunroof variant reaching 63.50 dB at 100 km/h. This difference is attributed to gaps and seals in the sunroof panel, which allow greater noise penetration from the external environment.

Technological advances and increasing job demands have made work stress a major concern in modern industrial environments. Noise is one of the physical workplace factors that may contribute to work stress. This study aimed to analyze the relationship between noise exposure and work stress among workers in the spinning department of PT X. A quantitative cross-sectional design was employed, involving 80 workers selected through purposive sampling. Noise levels were measured using a sound level meter, while work stress data were collected through a standardized questionnaire. Data were analyzed using the Chi-Square test.Most respondents were over 35 years old (80%) and female (54%). The highest noise level was recorded in the spinning room (102.17 dBA), while the fiber preparation room had the lowest level (84.07 dBA). Most workers experienced mild work stress (86.25%), whereas 13.75% reported moderate to high stress. The Chi-Square test showed no statistically significant relationship between noise and work stress (p = 0.074). However, the Likelihood Ratio test indicated a significant positive trend (p = 0.021). These findings suggest that excessive noise exposure may increase work stress and highlight the need for effective noise control, hearing protection, and stress management programs in the workplace.

Continuous chemical control of rat pests (Rattus spp.) can sometimes lead to resistance and resurgence problems, and even some cases of inaccurate targeting ultimately killing livestock. The idea of ​​​​repelling rats in rice fields using vibrations of crickets and other natural animals transmitted via radio has been done and the results are quite optimal for rat control, but it has not been done in corn cultivation. The purpose of this study was to determine the effect of cat sound audio on the intensity of rat pest attacks (Rattus spp.) in corn (Zea mays L.) plantations. The research location was in a farmer's land owned by a farmer in Dagan Village, Solokuro District, Lamongan Regency. Observations were carried out on two corn fields, each measuring 1400 m2 with a distance of 1 meter between the two fields. Determination of sampling points using the diagonal method, each into 5 sub-observation plots. In each sub-plot, markers were placed as sampling points. Audio with cat and bird sounds was played continuously from 05.00 pm - 07.00 am. Observations were conducted at 7:00 a.m. at all sampling points at 30 and 60 days after planting. Observations were conducted for three days using audio and three days without audio. Damage symptoms were observed directly at each sampling point. Corn plants showing symptoms were then recorded and analyzed using the Damage Intensity formula. Observations showed that the use of cat sound audio was able to reduce the level of rat infestation. At 30 days after planting, the damage percentage was reduced by 8.33%. Meanwhile, at 60 days after planting, the damage percentage was reduced by 18.33%.

Penelitian ini bertujuan untuk mengkaji dampak penutupan perlintasan kereta api Alastuo terhadap peningkatan volume kendaraan dan intensitas kebisingan di kawasan Fly Over Bangetayu, Kota Semarang. Fenomena ini mencerminkan tantangan tata kelola lalu lintas urban akibat perubahan infrastruktur transportasi. Dengan menggunakan pendekatan kualitatif deskriptif, studi ini dilakukan melalui metode studi kasus di lokasi terdampak. Data dikumpulkan melalui wawancara semi-terstruktur, observasi partisipatif, dokumentasi visual, serta pengukuran intensitas kebisingan menggunakan sound level meter pada sembilan titik waktu berbeda selama tiga hari pengamatan. Partisipan meliputi warga sekitar, pengguna jalan, dan petugas lalu lintas. Hasil analisis tematik menunjukkan adanya korelasi positif antara peningkatan volume kendaraan dan intensitas kebisingan, dengan nilai puncak kebisingan mencapai 93,6 dB pada sore hari. Temuan ini menegaskan bahwa perubahan rute akibat intervensi kebijakan infrastruktur dapat menyebabkan beban akustik yang signifikan di jalur alternatif. Penelitian ini memberikan kontribusi pada pemahaman tentang relasi spasial antara kebijakan lalu lintas dan degradasi lingkungan akustik. Implikasi teoretis mengarah pada integrasi studi kebisingan dalam perencanaan transportasi berkelanjutan, sementara implikasi praktis mencakup kebutuhan akan pengaturan lalu lintas yang adaptif serta mitigasi kebisingan melalui vegetasi, jalur alternatif, dan edukasi berkendara. Penelitian lanjutan disarankan melibatkan pendekatan interdisipliner untuk mengevaluasi dampak kebisingan terhadap kesehatan masyarakat secara langsung.

An exhaust pipe is a tubular device used to channel combustion gases from a vehicle’s engine into the environment. In addition to this primary function, the exhaust also serves to reduce the noise level produced by engine combustion. The component of the exhaust system that significantly affects torque, brake mean effective pressure (BMEP), and noise level is the silencer. This study aims to compare the torque, BMEP, and noise levels produced by variations in the length and construction dimensions of elliptical filter designs in the silencer. The silencers used in this research have lengths of 280 mm, 300 mm, and 260 mm, with short ellipse filter diameters of 25 mm and long ellipse filter diameters of 30 mm, 40 mm, and 50 mm. The research employs an experimental quantitative method, and the data were analyzed using one-way Analysis of Variance (ANOVA). The experiment was conducted in a Mechanical Engineering workshop using a Yamaha R15 V3 155cc injection motorcycle (2021), a Super Dyno 50L dyno test, and a sound level meter, from February to April 2024. The engine speeds tested were 1500, 2500, 3500, 4500, 5500, and 6500 rpm. The results show that the variation of ellipse dimensions 25 mm × 50 mm × 260 mm produced a maximum torque of 12.77 N·m at 4500 rpm, a maximum BMEP of 1021 kPa at 4500 rpm, and a noise level of 80.3 dB. The variation 25 mm × 40 mm × 300 mm produced a maximum torque of 12.88 N·m, a BMEP of 1042 kPa, and a noise level of 75.60 dB, while the variation 25 mm × 30 mm × 280 mm produced a maximum torque of 12.67 N·m, a BMEP of 1013 kPa, and a noise level of 75.63 dB.

Noise is a physical hazard in the work environment that caan reduce hearing loss, especially in the rubber processing industry. The research aims to describe the noise level and control efforts in the production area of PT. Karet XYZ Palembang City in 2025. This study uses a descriptive design with a cross-sectional approach.  Data were collected through direct noise level measurements using sound level meters at wet and dry production areas by taking 8 measurements and questionnaires on 75 selected purposive sampling workers.  Data analysis was carried out univariately. It shows that most of the measurement points have a noise level above the threshold value of 85 dBA in accordance with the Regulation of the Minister of Health of the Republic of Indonesia Number 70 of 2016. The highest values were recorded in the Hummer Mill engine (89,76 dBA) and the Cooling Tunnel (89,70 dBA). All respondents were exposed to noise for ≥8 hours/day. Noise control has been carried out with administrative techniques and the use of personal protective equipment (PPE) but has not been fully effective from the complaints of 7 workers regarding suboptimal protection. The noise level at PT. Karet XYZ and duration of exposure exceeding threshold values that increase the risk to workers health. It is necessary to increase the effectiveness of noise control with a technical, administrative approach and monitoring the optimal use of personal protective equipment (PPE).

The purpose of this study was to analyze the relationship between noise levels and work stress among employees at Karunia Kasih Hospital. This study used a cross-sectional design with a population consisting of all employees in the Front Office, Polyclinic Nurses, and Specialist Doctors. The study sample consisted of 80 respondents selected using total sampling technique. Noise levels were measured using a Sound Level Meter, while work-related stress was assessed using a questionnaire. Data analysis was conducted using the chi-square test with a significance level of α = 0.05. The measurement results indicated that 80% of the work areas had noise levels exceeding the NAB 65 dBA threshold. The Outpatient Corridor area had the highest noise level (83 dBA). A total of 65% of workers experienced moderate to severe work-related stress. There was a significant relationship between noise levels and work-related stress (p-value = 0.001). Age (p-value = 0.024) and length of service (p-value = 0.037) also showed a significant relationship with work-related stress. There is a significant relationship between noise levels and work-related stress among workers at Karunia Kasih Hospital. Efforts to control noise levels and comprehensive stress management programs are needed to protect worker health.

Noise generated by Diesel Power Plants (PLTD) is a significant environmental problem, especially in urban areas and settlements adjacent to power plant facilities. This study analyzes the noise level around the Fakfak Cotton Plant and its impact on the local community. This study uses a combination of methods, including noise level measurements using a Sound Level Meter (SLM), field observations, interviews with the community, and a SWOT analysis to evaluate the strengths, weaknesses, opportunities, and threats in noise mitigation. The measurement results show that the noise level generated exceeds the threshold of 55 dBA set by the Decree of the Minister of Environment Number 48 of 1996 for residential areas. This condition has a negative impact on the comfort, health, and social interaction of the community around the PLTD location, causing sleep disturbances, stress, and decreased quality of life. The SWOT analysis shows that although the PLTD has advantages in terms of sustainable operations and professional workers, the main weaknesses lie in the lack of soundproofing and the absence of regular noise evaluations. However, there is a great opportunity in the application of noise mitigation technologies, such as the installation of soundproofing, the use of acoustic walls, and planting vegetation as a sound barrier. In addition, collaboration with local governments and increasing environmental awareness can help manage noise impacts more effectively. The main threats identified include potential social conflicts with surrounding communities, negative health impacts, and changes in environmental policies that can affect PLTD operations. With the right mitigation strategies, such as the application of soundproofing technologies, improved communication with the community, and better integration of environmental policies, the environment around PLTDs can become more comfortable and conducive for the community. This study emphasizes the importance of regulatory and technology-based approaches in managing noise in urban environments, as well as the need for sustainable mitigation measures to maintain the well-being of communities around PLTDs..

In an era of increasingly advanced technology, seabed mapping is very important in various fields, such as ship navigation, underwater infrastructure development, and marine environmental research. The use of a seabed sounding system at PT PAL has improved the quality of seabed mapping. The purpose of this study is to analyze the seabed at the PT PAL Surabaya pier in order to find out through seabed mapping using a bathymetric survey system and to find out the level of shallowing at each pier and which area is safe for ships to dock. This study uses a quantitative descriptive method. Pier sounding data using an echosounder tool at the PT. PAL Surabaya pier. The sounding data obtained starting from 2023 contains information about the depth of the pier, and will later be used to calculate Tool Correction, Fluctuation Correction, LWS (Low Water Spring) Correction, and Real Depth (actual depth). The results of the study show that based on the results of a bathymetric survey at PT. PAL in September 2023, the depth data at the West Peninsula pier is at a shallowest depth of 4 meters and the deepest is 6 meters. While the shallowest depth at the West Bandar pier is 3 meters and the deepest is 6 meters. At the North Peninsula pier the deepest depth is 8 meters marked with a solid green color. From these results it can be seen what ships can enter each particular pier area, namely ships that have a minimum draft of 2.65 m.

The sport of fencing is centered on skill tactics like cutting, stabbing, or using hand agility to parry an opponent's sword. In fencing, athletes must have strong reflexes and focus in order to both attack and evade attacks from opponents. An LED lamp, a buzzer, and an ultrasonic sensor were used in the tool's design. When the athlete runs toward the sensor—which is identified by a buzzer that sounds and an LED that illuminates—the gadget functions as follows: the athlete waves his hand at the sensor. The distance between the instruments is positioned according to the athlete's needs and skill level. The website that has been developed will show the ultrasonic sensor's detecting findings. The website's architecture allows for multiple tool function configurations, including training mode, tool delay, tool duration, tool detection distance, and indicators of the number of connected sensors. When the tool's durability was tested against distance, it was found to be able to establish a connection between the client and server up to 20 meters away with an average connected time of 27.39. The tool's delay test yields an average of 14.57 seconds. an average of 0.078 when the tool's point inaccuracy is tested.

This study analyzes noise levels caused by traffic activities and generator sets (genset) in the Semarang University environment. Measurements were conducted using descriptive analytical methods by comparing measurement results against noise quality standards according to KepmenLH No.48 of 1996. Data collection was carried out in November 2023 at three location points (in front of Building V, Sports Center, and USM gate) during morning (08.00-08.30), afternoon (12.30-13.00), and evening (17.30-18.00) on weekdays and weekends. Measurement results showed traffic noise levels on weekdays reached 88.3 dB in front of the Sports Center, 85.3 dB at Building V, and 82.1 dB at the USM gate. On weekends, the highest noise level reached 82 dB. Generator noise measurements in stationary conditions reached 108.4 dB and increased to 112.4 dB during loading. The highest vehicle volume occurred during weekday evenings, reaching 3,176 vehicles/hour. Research results indicate that noise levels in the campus environment are above the permitted threshold of 55 dB for educational areas. The study recommends the construction of noise barriers and evaluation of generator placement to reduce noise impact on campus activities.

Noise in educational environments can affect the effectiveness of teaching and learning processes. This study aims to analyze the impact of traffic noise on teaching and learning activities in Building V of Semarang University, located along the Soekarno-Hatta arterial road. The research method uses a qualitative descriptive approach by measuring noise levels using a Sound Level Meter on six floors of the building. Measurements were taken during active lecture hours with time intervals of 3 x 30 minutes. The results showed that noise levels on floors 1 to 3 were above the educational environment quality standard of 55 dB according to KepMenLH No. 48 of 1996. Meanwhile, on the 6th floor, the noise level averaged around 55 dB. Excessive noise makes it difficult for students to hear lecturers' explanations, reduces their ability to capture information, and decreases learning material retention. To address these issues, sound insulation installation, spatial planning improvements by designing room layouts farther from noise sources, vegetation planting, and lecture rescheduling to avoid peak traffic times are necessary.

Kebisingan adalah suara yang bersumber dari alat-alat produksi dan atau alat-alat kerja yang tidak dikehendaki karena dapat menimbulkan gangguan pendengaran.  Penelitian ini bertujuan untuk mengetahui intensitas kebisingan di SDN 05 Marunda.  Pengukuran intensitas kebisingan dilakukan menggunakan alat ukur Sound Level Meter dengan metoda pengukuran intensitas kebisingan di tempat kerja mengacu pada SNI 7231:2009.  Hasil yang diperoleh akan dibandingkan dengan nilai ambang batas kebisingan pada Peraturan Menteri Ketenagakerjaan Republik Indonesia Nomor 5 tahun 2018 tentang Keselamatan dan Kesehatan kerja Lingkungan Kerja.  Metode Penelitian yang digunakan adalah analisis deskriptif dengan teknik pengumpulan data secara systematic purposive sampling.  Data pengukuran intensitas kebisingan dilakukan selama 8 jam kerja dengan 3 kali waktu pengukuran di setiap titik yaitu pada pagi hari, siang hari dan sore hari.  Adapun titik pengukuran di tempat kerja yang berpotensi terpapar kebisingan dari sumbernya yaitu Koridor Lantai 1, Ruang Kelas Lantai 1, halaman belakang, Ruang Kelas Lantai 3, Koridor Lantai 3 dan Ruang Guru Lantai 3.  Hasil pengukuran dari seluruh titik diperoleh nilai tertinggi didapatkan dari Ruang Kelas Lantai 1 dengan nilai intensitas kebisingan 80,55 dBA, sedangkan nilai terendah diperoleh dari halaman belakang dengan nilai intensitas kebisingan 61,86 dBA.  Secara keseluruhan titik pengukuran tidak didapatkan hasil melebihi dari nilai ambang batas yang diatur pada Peraturan Menteri Ketenagakerjaan Republik Indonesia Nomor 5 tahun 2018 untuk 8 jam kerja.  Hal ini dikarenakan salah satu sumber kebisingan yang selama ini sering dikeluhkan oleh karyawan di SDN 05 Marunda yaitu kegiatan pekerjaan di Kapal seperti revitalisasi kapal beroperasi aktif diluar 8 jam kerja.