Judul: Analysis of noise on black tea processing in milling, drying, and sorting room of PTPN VIII Gunung Mas Plantation, Cisarua, West Java
Abstrak: Tea plant is a green leafy plants commonly cultivated in high mountain regions. Black tea was made through fermentation, and furthermore black tea was divided into two types, they are orthodox tea and CTC tea (Crushing, Tearing, and Curling). The processing of CTC tea at PTPN VIII Gunung Mas Plantation include acceptance of raw material, disclosure of tea leaves, withering, milling and fermentation, drying, sorting and packaging. PTPN VIII Gunung Mas Plantation running the production activity by using the machines in large scale. The use of machinery on a large scale resulted in positive impact and negative impact for worker and company. One of the negative impacts suffered by workers is noise impact. Noise can be defined as undesirable sound, annoying sound, or irritating sound that in the long run will be able to disrupt the comfort when working. Noise that exceeds the threshold value will cause a reduction in auditory function, and if it goes on will cause deafness in factory workers. This can lead to decrease in concentration of work. The purpose of measuring noise in the factory is to analyze the areas that produce high noise so that the factory worker can work in the factory according to a predetermined safe time, this is to reduce the negative effects of noise. High frequency noise can be found in milling room, drying room and sorting room. The pattern of noise spread on every shift are not equal, it is because the number of machines that operating in shift 1 and shift 2 was different, so that the noise value in shift 1 was higher than shift 2. The noise value in milling room, drying room and sorting room exceeds the threshold value. Therefore, the safe time for being in that rooms were average below 8 working hours/day. To prevent damage to auditory, worker advised to use ear protection device to protect their auditory during work.
Keyword: 

Judul: Analisis dan Pengendalian Kebisingan pada Proses Pengolahan Kelapa Sawit di Pabrik Kelapa Sawit Kertajaya PTPN VIII Lebak, Banten
Abstrak: Kebisingan mesin adalah salah satu dampak negatif dari kemajuan teknologi yang dapat menyebabkan kerusakan pendengaran, gangguan sistem cardiovascular, mengurangi kinerja, dan perubahan di dalam perilaku sosial. PTPN VIII, PKS Kertajaya, Lebak, Banten merupakan industri pengolahan sawit yang memiliki tingkat kebisingan yang tinggi. Penelitian ini bertujuan mengukur dan menganalisis kebisingan di stasiun pengolahan sawit dan menentukan durasi aman maksimum berada pada area kerja berdasarkan nilai batas kebisingan. Penelitian dilakukan dengan mengukur kebisingan menggunakan sound level meter dengan metode grid di tujuh stasiun penelitian, dan melakukan wawancara kepada pekerja. Hasil pengukuran kebisingan dianalisis dengan pembuatan pola sebaran kebisingan. Tingkat kebisingan yang dihasilkan dari ketujuh stasiun memiliki nilai yang tinggi yaitu diatas 85 dB. Bagian dengan kebisingan tertinggi yaitu di stasiun boiler dengan nilai kebisingan 89.2-114.1 dB, sehingga batas waktu maksimum pada titik kritis pekerja yaitu 35.9 menit/hari. Bagian kebisingan terendah yaitu pada stasiun perebusan dengan nilai kebisingan 79.1-89.9 dB, sehingga batas waktu maksimum pada titik kritis pekerja yaitu 16.8 jam/hari. Pengendalian yang sesuai dengan kondisi PKS Kertajaya yaitu pekerja memasang ear plug (sumbat telinga) yang dapat mereduksi hingga nilai batas aman yang telah ditentukan.
Keyword: alat pelindung diri, kebisingan, PKS Kertajaya

Judul: Embriogenesis ikan buta (Astyanax fasciatus)
Abstrak: Ikan buta Astyanax fasciatus adalah spesies ikan unik dari famili Characidae yang menempati perairan dalam gua di Wilayah La Cueva Chica-San Luis Potasi-Mexico. Ikan ini memiliki mata yang tereduksi (Blind Cavefish) dan warna kulit merah muda, pucat serta mengkilap.
Keyword: