Judul: Teknik dan biaya budidaya jabon (Anthocephalus cadamba Miq.) oleh petani kayu rakyat
Abstrak: Jabon (A. cadamba) has been cultivated in Bogor social forest since 2008. Research about technic and cost of jabon cultivation in the social forest is needed because difference by location and probably has impact to difference in output, such as in the wood volume. Identification technic and cost of jabon cultivation has been done toward 11 farmers of Bogor social forest by purposive sampling. Assumption in this research are similarity in site and not occurring economy fluctuation. The result showed that, pattern cropping that generally applied is agroforestry. The components of jabon cultivation technic that more complete applied by the respondent A1, C2, C3, and B4 rather than others respondent in the every age class. More complete cultivation components in the practice allegedly produce higher volume. The highest cost of jabon cultivation expended by respondent B1, B2, C3, and B4 in the every age class. The total cost of jabon cultivation didn’t influences jabon volume
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Judul: Panjang dan Kedalaman Akar Lateral Jabon di Desa Cibening, Kecamatan Pamijahan, Kabupaten Bogor, Jawa Barat.
Abstrak: Jabon (Anthocephalus cadamba (Roxb.) Miq.) is one of the current tree species that have been cultivated in plantation forest and social forest. Jabon belongs to fast growing species with straight and cylindrical shape, made jabon as the most wanted raw material for wood industry. However, the expansion of jabon is not in line yet with land utilization by agroforestry system. Land utilization by using appropriate agroforestry system could increase economic income at the same time provide soil and water conservation underneath the tree stand. Good cultivation system arrangement was influenced by rooting system. This is related to the absorption of nutrient elements between staple crops and agriculture crop. In addition root system affects the growth of crown that would influence the availability of sunlight to agricultural crops. This research aims to find out jabon’s rooting systems in a mixed and monoculture pattern. The benefits of this research is to give a reference agricultural crops in accordance with condition of the rooting. The results showed that the rooting in the mix and monoculture pattern has a long and deep roots that are almost the same. Setting the right planting distance between staple crops and agricultural crops are necessary to avoid competition of nutrients, water and light
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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