Judul: Water use for potato plant (Solanum tuberosum, L) using aeroponics system
Abstrak: Aeroponics is one solution to overcome the limitations of agricultural area. Aeroponics sytem has many advantages, one of them is the water usage efficiency. This study was conducted to calculate the water losses on potato plant using two lighting period treatments; 12 hours and 24 hours. The water losses from the 12 hours lighting period is about 0.12 mm/day, while the 24 hours loss 0.14 mm/day. The room temperature during the observation ranged from 19.00 C to 22.90 C. The measured temperature within 24 hours was 20.00 C–26.50 C. The low humidity affect the plant growth caused death of the plant. Air humidity that is measured within 24 hours was approximately 50%.
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Judul: Pendugaan kehilangan air melalui perhitungan neraca air serta analisis pertumbuhan tanaman kentang (Solanum tuberosum L.)
Abstrak: The growth and the production of a plant are determined by favourable environment. Soil is water reservoir and planting area for which the capability to keep the water in the soil will determine the total water that can be used for the plant. Water availability in the soil is used by the plant to fullfil plant’s water requirement such actual evapotranspiration and runoff which can be calculated by using the water balance. The objective of this research is to calculate the potato water loss during the measurement through the water balance and to analyse the effect on potato growth. The result of this research shows that the potato water loss (actual evapotranspiration and runoff) during measurement on 37 days until 73 days after planting is 148-191 mm or 4.6 mm/days, whereas the run off is 28-59 mm or 19-30 % from total water loss potato. The relations between soil water content and the growth rate in each treatment has a different disposed. When the storage of soil water content is high, the growth rate is uncertainly high, and vice versa. The growth rate is of the potato in this research not only influenced by soil water content, but also influenced by other factors that are not observed in this research.
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Judul: Transisi Fasa Materi Hadronik ke Materi Kuark pada Inti Bintang Neutron.
Abstrak: Bintang neutron terdiri dari beberapa lapisan yang disusun oleh materi nuklir yang berbeda dengan kerapatan yang semakin tinggi ketika mendekati pusat bintang. Inti luar bintang neutron disusun oleh materi hadronik (nukleon, lepton, dan hyperon), sedangkan inti dalam bintang neutron disusun oleh kuark-kuark bebas (up, down, strange) yang saling berinteraksi. Tujuan penelitian ini adalah mempelajari bagaimana transisi dari inti luar ke inti dalam bintang neutron dengan menggunakan pendekatan RMF (Relativistic Mean Field) untuk materi hadronik dan CIDDM (Confined Isospin Density Dependent Mass) untuk materi kuark. Tekanan transisi diperoleh ketika potensial kimia barion materi hadronik dan materi kuark bernilai sama. Nilai tekanan transisi dengan parameter SU6-TM1 sekitar 87 MeV/fm3 dan diperoleh massa maksimum bintang neutron yaitu 1.92M dengan jari-jari sekitar 8.62 km. Nilai tekanan transisi dengan parameter SU6-G2 sekitar 53 MeV/fm3 dan massa maksimum bintang neutron yaitu 1.88M dengan jari-jari sekitar 8.16 km. Jenis transisi fasa adalah orde satu ditandai dengan diskontinuitas dalam kerapatan energi (adanya mixed phase). Parameter-parameter pada model nuklir yang digunakan menyebabkan perbedaan kekakuan persamaan keadaan (EOS) dari materi hadronik dan materi kuark sehingga nilai tekanan transisi dari fasa hadronik ke fasa kuark juga berbeda.
Keyword: bintang neutron, persamaan keadaan, transisi fasa