Judul: Characterization of Thermal Water Current Meter Sensor ( Laboratory test in Pipe Flow)
Abstrak: Dpl Thermal type water flow meter is a device to measure water flow rate using thermal sensor. There’s two sensor inside this device which one of the sensor is wrapped by heated wire. Flow rate measurement is using difference value between the temperature of sensor that wrapped by heated wire with the temperature of flowing water. The principal of this device is heat transfer between the sensor and the water, so the flow rate is measurable. If the flow rate increasing then the temperature difference between sensor and water is decreasing, vice versa. Based on simulation, low flow rate make the device getting more sensitive and the sensitivity is decreasing as the flow rate is increasing. On low flow rate, the temperature difference between the heated sensor with water flow is very small, so to get more visible result, this device is using differential amplifier. This way, the slightest temperature difference between the heated sensor and water flow is visible even for higher flow rate. Flow rate measurement done to a calibration system made. Flow rate is determined with measuring rate debit then divided by pipe sectional area and value of flow rate can be obtained. Calibration system is using a 2.3cm diameter pipe and the distance between two sensors is 15cm. The heat that is given to heated wire is 2.8 Watt which can increase the temperature of the sensor by 5Co if the flow rate is 0.05 m/s. The equation that obtained by calculation is x = 5.512 e-93y where x is the water flow rate and y is the temperature difference between heated sensor with the water. There is difference between model simulation with the calculation result in this research. It is caused by assumption that applied during the time of calculation.
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Judul: Rancang Bangun dan Uji Kinerja Water Temperature Data Logger
Abstrak: Water temperature data logger is an instrument to record the water temperature automatically and to show a comprehensive monitoring of temperature condition of the medium or environment. This research aims to design and construct water temperature data logger and to perform field test. There were five stages conducted: the casing design, electronic system design, software design, test labs, and field test. Casing was designed using cylindric aluminum material with a diameter of 3.2 cm and a length of 16.5 cm. The electronic systems are built from the microcontroller ATmega328P as main controller, DS18B20 as temperature sensor, mini DC motor as vibration indicator, DS3231 as time marker sensor, and micro SD card as data storage. The result of performance test of water temperature data logger showed that casing was waterproof and did not need an addition of ballast. The battery life time is 10 days 8 hours for 30 minutes sampling intervals. The range error value of sensor calibration is between (-0.37) – 0.41°C and RMSE value 0.23 °C. The result of measurement in Bogor Agricultural University lake on October 10th – 20th 2013 ranged from 27.69 - 31.63 °C with the lowest daily temperature at 5.30 – 8.30 WIB and the highest at 12.00 - 16.00 WIB. T-test comparison of data between the water temperature data logger and a thermometer in MSP Department FPIK IPB pond for two days showed that the data were not significantly different
Keyword: temperature, performance test, instrument, design, data logger

Judul: Dayasaing Ubi Jalar di Kabupaten Kuningan Jawa Barat
Abstrak: Ubi jalar sebagai pangan alternatif pengganti beras, merupakan sumber karbohidrat yang baik, mengandung lebih dari 25 persen karbohidrat atau lebih dari 70 persen jika sudah dibuat tepung. Ubi jalar juga dikenal sebagai sumber karbohidrat yang mengandung betakaroten, vitamin E, Kalsium, zat besi, dan serat. Tak heran jika kini ubi jalar menjadi primadona di berbagai negara Amerika, Korea SeIatan, Filipina, Taiwan dan Jepang. Perkembangan produksi ubi jalar Indonesia dari tahun 2001 sampai 2006 berfluktuasi, dengan laju pertumbuhan rata-rata produksi sehesar 1,33 persen pertahun, dengan produksi tertinggi dicapai pada tahun 2004 sebesar 1.991.478 ton. Perkembangan luas panen ubi jalar di Indonesia tahun 2001 sampai 2006 cenderung menurun dengan Iaju pertumbuhan rata-rata luas panen sebesar -0,42 persen pertahun. Berbeda dengan perkembangan luas panen, nilai ekspor ubi jalar dari tahun 2001 sampai 2006 selalu meningkat. Peningkatan nilai ekspor ubi jalar ini merupakan suatu peluang bagi peningkatan produksi dan produktivitas ubi jalar Indonesia. Di Indonesia, sentra produksi ubi jalar adaIah Propinsi Jawa Barat, Jawa Tengah, Jawa Timur, Irian Jaya, dan Sumatra Utara. Salah satu sentra produksi ubi jalar Jawa Barat adalah Kabupaten Kuningan. Menurut data yang diperoleh dari Departemen Pertanian, produksi ubi jalar terbesar di Jawa Barat adaIah Kabupaten Kuningan Di Kabupaten Kuningan, terdapat dua poIa pemasaran ubi jalar dengan varietas yang berbeda dan negara tujuan ekspor yang berbeda juga. PoIa pertama yaitu dari petani Iangsung ke PT Galih Estetika, perusahaan pengekspor ubi jalar olahan yang berada di Kabupaten Kuningan dengan tujuan ekspor negara Jepang melalui program kemitraan.. PoIa yang kedua yaitu dari petani melalui tengkuIak laIu ke perusahaan pengekspor ubi jalar olaban di Lembang dan Semarang dengan tujuan ekspor Korea.
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