Judul: Analyzing of acceleration and direction of mechanical vibration to physiological, motoric and psychological of human
Abstrak: Machinery has helped human work but also generate mechanical vibration. Mechanical vibration has disturbed human performance. This research analyzed effect of mechanical vibration to human in laboratory. Simulator was designed based on mechanical concept. It vibrates at frequency below 50 Hz and acceleration between 1 m/sc2 and 10 m/sc2, like vibration in sugar cane factory. Objective of this paper is analyzing effect of mechanical vibration to exhausted, energy, response time, and human discomfort at some levels of vibration accelerations. Simulator has produced vibration in six levels of acceleration. Fourteen subjects participated in this simulation. Human exhausted was measured by flicker test, working energy based on human heart rate, discomfort based on respondent questioner, and response time based on response time simulation. On this research, WBV didn’t have significant effect on human exhausted. Curve of working energy and response time have the similar shapes, increased as polynomial pattern as increased of acceleration simulation. Longer stimulus time and higher working energy happened at acceleration 1.5 m/sc2 – 4.5 m/sc2. Graph of discomfort had power curve shape, because discomfort was subjective judgment which involved human sensor. Effect of vibration on horizontal direction is higher from vertical direction on working energy, response time, and discomfort of human.
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Judul: Mechanical Vibration on the Floor of the Pilot Plant for Tuna Eye Oil Production
Abstrak: Getaran adalah gerakan berisolasi dari sistem mekanis serta kondisi-kondisi dinamisnya. Getaran mekanis adalah getaran yang ditimbulkan oleh alat mekanis, yang sebagian dari getaran ini sampai ke tubuh operator dapat menimbulkan dampak negatif terhadap kesehatan dan mengganggu kenyamanan. Ergonomi adalah ilmu atau pendekatan multidisipliner yang bertujuan mengoptimalkan sistem manusia- pekerjaannya, sehingga tercapai alat, cara dan lingkungan kerja yang sehat, aman, nyaman, dan efisien. Penelitian ini bertujuan untuk mengukur getaran mekanis pada pilot plant pengolah mata ikan tuna dan menentukan waktu aman terpapar getaran. Root Mean Square (RMS) getaran seluruh mesin produksi yang merambat pada lantai sebesar 0,1-3,82 m/s^2. Paparan getaran tertinggi pada lantai disebabkan oleh mesin screw press dengan nilai getaran sebesar 3,82 m/s^2. Titik tempat pekerja mengoperasikan mesin sebesar 3,82 m/s^2. Nilai percepatan getaran pada titik operator bekerja adalah 0,38-1,57 m/s^2. Reduksi getaran dapat dilakukan dengan menggunakan rekayasa teknis yaitu dengan pemasangan bantalan berbahan rubber dumper pada alas mesin., Vibration is the isolated motion of a mechanical system and its dynamic conditions. Mechanical vibration is vibration caused by mechanical devices, some of which reach the bodies of employees and can have a negative impact on health and disturb comfort. Ergonomics is a multidisciplinary science or approach that aims to optimize the human-work system so as to achieve tools, ways, and work environments that are healthy, safe, comfortable, and efficient. This study aims to measure mechanical vibrations in the tuna eye oil processing pilot plant and determine safe exposure times to these vibrations. The Root Mean Square (RMS) vibration of all production machines transmitted to the floor ranges from 0.1 to 3.82 m/s 2 . The highest vibration exposure on the floor is caused by the screw press machine, with a vibration value of 3.82 m/s 2 . The vibration acceleration values at the operator's workstation range from 0.38 to 1.57 m/ m/s 2 . Vibration reduction was achieved through engineering techniques by installing rubber dampers at the base of the machine.
Keyword: Ergonomi, getaran mekanis, pilot plant

Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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