Judul: Rancang bangun dan uji teknis unit pemisah pada mesin sortasi mangga berbasis pengolahan citra
Abstrak: Mangga merupakan salah satu buah-buahan yang telah banyak dikenal di Indonesia, dari jenis yang bermutu rendah sampai bermutu tinggi. Buah ini mempunyai peluang untuk ekspor, karena mempunyai cita rasa yang khas dan lezat serta mengandung nilai gizi yang cukup tinggi. Mangga kualitas ekspor harus memperhatikan keseragaman mutu dan kualitas dari buah mangga tersebut. Sejalan dengan perkembangan ilmu dan teknologi, keterbatasan sistem sortasi manual dikembangkan dengan suatu metode atau alat sortasi mangga. Alat sortasi mangga ini dikembangkan dengan sistem otomatisasi, yaitu dengan menggunakan bantuan komputer.
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Judul: Desain Sistem Mekanik Unit Pengumpan dan Penampung pada Mesin Sortasi Mangga Berbasis Pengolahan Citra
Abstrak: Indonesia termasuk dalarn sepuluh besar negara penghasil mangga di dunia dengan produksi 2.67 % dari total produksi dunia pada tahun 1998 (22 448 752 Mt). Namun pada tahun yang sarna, share ekspor dunia untuk mangga produksi Indonesia hanya sebesar 0.0041 % (FAO statistics). Masalah yang sering muneul pada komoditas ekspor produk hortikultura di Indonesia adalah kualitas produk pada saat sampai di negara tujuan. Misalnya ketidaksesuaian mutu buah dengan kualifikasi yang dinginkan negara pengimpor serta ketidakseragaman mutu dari buah tersebut. Salah satu tahapan kegiatan pasea panen untuk komoditas buah-buahan yang dapat mengatasi masalah terse but adalah proses sortasi dan pemutuan. Mesin sortasi mangga berdasarkan pengolahan eitra menggunakan mikrokomputer telah dikembangkan dan diuji oleh Prathama (2002) dan telah berhasil menyortir buah mangga secara seragarn, konsisten, dan otomatis berdasarkan hasil pengolahan citra yang telah dikembangkan oleh Gunayanti (2001).
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Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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