Judul: Budidaya Tanaman Akar Wangi (Vetiveria zizanioides (L.) Nash) dalam Wadah: Pengaruh Komposisi Media Tanam dan Jumlah Bibit.
Abstrak: The objectives of this experiment were to determine the effect of media composition and the number of seedlings planted on the growth of hydroponically grown vetiver (Vetiveria zizanioides). Vetiver ‘Verina 2’ variety was grown in polybags in a greenhouse of the Cikabayan Bawah Experimental Farm (240 m above sea level) started from November 2012 to July 2013. This experiment was arranged in a randomized complete block design with two factors and five replications. The first factor was media composition (v/v), consisted of three levels i.e. 100% charchoal husk, charcoal husk : styrofoam (2:1), and charcoal husk : styrofoam (1:1). The second factor was the number of seedlings in one polybag consisted of one seedling and two seedlings. The results showed that there were no interaction effects of media composition and number of seedlings planted to plant growth and root growth of vetiver. Plants grown in charcoal husk : styrofoam (1:1) medium had significantly higher number of plants per cluster, higher number of leaves, higher chlorophyll and carotenoid contents, higher number of roots, and longer primary roots than those in other media compositions. Planting two seedlings per polybag resulted in higher number of plant per cluster, higher number of leaves, higher shoot fresh and dry weight, and higher number of roots than one seedlings per polybag. These results showed that planting two seedlings in polybag containing charcoal husk : styrofoam (1:1) resulted in the best vegetative growth and root growth of vetiver.
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Judul: Pengaturan Intensitas Larutan Hara terhadap Pertumbuhan Tanaman Akar Wangi (Vetiveria zizanioides L.) yang Dibudidayakan Secara Aeroponik
Abstrak: The experiment was conducted to study the growth respons of vetiver (Vetiveria zizanioides L) in aeroponic cultivation. Aeroponic application implemented in greenhouse of University Farm IPB Dramaga, Bogor in February- May 2013. Experiment was using Randomized Complete Block Design, 4 treatments 3 replications. The treatments were 1 minute nutrients application (On) 4 minutes pause (Off) 1 seed per planting hole, 1 minutes On 4 minutes Off 2 seeds per planting hole, 2 minute On 8 minutes Off 1 seed per planting hole, 2 minutes On 8 minutes Off 2 seeds per planting hole. The result showed that the treatment of 2 minutes On 8 minutes Off 1 seed per planting hole and the treatment of 2 minutes On 8 minutes Off 2 seeds per planting hole affect on vetiver root length. The treatment of 1 minute On 4 minutes Off 2 seeds per planting hole had a highest number of roots result. All treatments did not affect to plant height, chlorophyll content, and vetiver leafes greenness. Over all, aeroponic system resulted root growth better than fields.
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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