Judul: Steering automation on 4 wheels tractor using LabVIEW and RTK-DGPS (case study: 4 wheels mini tractors)
Abstrak: Automation has an important embedded function provided in almost all devices and recently becomes a revolutionary function to agricultural machinery. This research deals with the development of 4 wheels tractor’s steering automation prototype. Identification of principal parameters on tractor steering has been done, i.e. torque inflection, left and right maximum inflection angle of front wheel and steering rotation angle to front wheel inflection ratio. Proximity sensor to sense straight-line trajectory and potentiometer to sense inflection angle of front wheel were used, which are objected as feedback for steering control position. All hardware data acquisition were done through Ni-DAQ hardware interface. Data were processed with labVIEW to instruct the motor driver related to change of direction and speed of steering wheel. The result of the experiments showed that steering control based on proximity sensor gave unsatisfied performance. Maximum deviation on the asphalt straight-line trajectory reached the largest deviation of 6.8 cm outer and 6.1 cm inner. Turn right test at the trajectories, resulted the largest deviation at 4.5 cm outer and 7.0 cm inner, whereas turn left test resulted the largest deviation of 6.2 cm outer and 7.2 cm inner. Steering automation performance of RTK-DGPS testing results Steering automation performance of RTK-DGPS testing results on the asphalt path the deviation occurs, the right path of 223 cm, while the left path as far as 89 cm. The results of the land right deviation of 171 cm, while the left side as far as 415 cm while testing using plow implement. deviations occur for the right and left by 75 cm by 11 cm. While in the second test occurred deviation of 123 cm on the right, while on the left by 56 cm.
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Judul: Rancang Bangun Sistem Kendali Otomatis Traktor Roda Empat
Abstrak: Automation of four-wheel-drive tractor is an alternative of solution to the lack of manpower operator in the future. With the automated control system, the tractors can be operated without interruption as long as the fuel still available, workload and fatigue experienced by operators can be reduced, can also improve the accuracy of productivity, and reduce the possibility of overlapping while processing of land. In this current research, control of tractor is limited to the operation of acceleration pedal, clutch system, and steering systems. The main components of the control system consists of a DC-motor as a driving power transmission system that connects actuators, and sensors that monitor the position of the movement of the actuator position. These components were designed to work according to the steps of manually operation. Data research showed the system to function properly. Speed of the clutch lever operation until it reaches the point of maximum point is one second, and the release rate to the point of minimum pressure is two seconds. Average rotary speed of steering wheel to deflect to the right is the 7.40°/s, and for a left turn is 13.16°/s. Acceleration lever presses speed is 17.91 cm/s and the speed of release is 20.99 cm/s.
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Judul: Karakteristik Protein Mioglobin dan Parvalbumin pada Ikan Tongkol Komo (Euthynnus affinis).
Abstrak: Ikan tongkol mengandung dua jenis daging, yaitu daging merah dan daging putih. Dua jenis daging memiliki kandungan mioglobin dan parvalbumin yang berbeda. Penelitian bertujuan menentukan karakteristik protein mioglobin dan parvalbumin pada daging putih dan daging merah ikan tongkol komo (Euthynnus affinis). Kandungan mioglobin dianalisis secara kuantitatif menggunakan spektrofotometri, sedangkan parvalbumin diidentifikasi menggunakan Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis (SDS-PAGE). Kandungan mioglobin daging merah lebih tinggi dibanding daging putih. Daging merah bagian tengah memiliki kandungan mioglobin tertinggi. Analisis spektrofotometri mengindikasikan bahwa jenis mioglobin yang dominan adalah metmioglobin. Proses pemanasan dapat merusak protein mioglobin. Kandungan parvalbumin ditemukan pada daging putih dan hanya terdeteksi pada bagian depan. Proses pemanasan tidak dapat merusak protein parvalbumin.
Keyword: daging merah, daging putih, metmioglobin