Judul: Pengaruh Tinggi Penggenangan Air terhadap Pertumbuhan dan Produksi Padi Sawah (Oryza sativa L.)
Abstrak: The experiment was conducted at farmer’s rice field in Jabong (the district of Subang), from November 2012 to February 2013. The objective of this research was to study effects of high water lodging on growth and yield of lowland rice. The experiment was arranged in completely randomized block design single factor with three replications. The treatments was high water lodging, consist of : (a) high water lodging 0 cm; (b) high water lodging 2.5 cm above soil surface; (c) high water lodging -2.5 cm above soil surface. Results showed that high water lodging 0, 2.5, -2.5 cm did not decrease the plant height, number of tiller per hill, as well as grain yield and overall yield components. Therefore, high water lodging -2.5 cm could be executed at the lowland rice cultivation.
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Judul: Pertumbuhan dan Produksi Galur-Galur Padi Sawah pada Tinggi Genangan yang Berbeda
Abstrak: Rice (Oryza sativa L.) is one of the most important cultivated plants, as it is a staple food for the majority of the world population and the Indonesian Society. In line with the times, rice not gets enough water for maximum growth, so it is necessary tolerant rice at a minimum water level. The purpose of this study was to determine the effect of water level on the growth and production of rice and to get rice strains that matched the minimum water level. This study uses a split plot design with three replications. The first factor is the main plots consisting of a pool of high water level 2.5 cm and 0 cm from the soil surface. The second factor is 8 strains rice resistant to the minimum water level. F test results indicate that the water level did not affect the growth and production of eight starins rice tested. Strains tested showed similar vegetative growth, but the visible difference in the production of each strain. At 0 cm water level several strains that produce the maximum is strains 1, 3, 4, and 6.
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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