Judul: Rancangan Teknik Bangunan Irigasi Pedesaan di Desa Petir dan Desa Neglasari Kabupaten Bogor
Abstrak: The availability of water in rural irrigation schemes is a main factor have to be considered in managing irrigation water. This study was conducted in Neglasari village and Petir village. In Neglasari village, the problem was irrigation water shortage during dry season because water from the river did not flow into intake channel, whereas the problems in Petir village were unstable channel and the dam height was not sufficient. The purpose of this study was to prepare engineering design of dam in Neglasari village, and diversion box and dam in Petir Village. The engineering design of dam in the Neglasari village has been prepared with the construction of gabions, reinforced with concrete columns and the total construction cost of 17,363,000 rupiahs. The engineering design of diversion box in Petir village has been prepared with masonry construction and the total construction cost of 4,730,000 rupiahs. The engineering design of dam in Petir village has also been prepared with the construction of gabions and the total contruction cost of 7,000,000 rupiahs. The participation of farmers is the important factor for the success of rural irrigation schemes management
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Judul: Rancangan Bangunan Hidrolika pada Jaringan Irigasi Pedesaan di Desa Pekiringan Alit, Kecamatan Kajen-Pekalongan
Abstrak: The objective of the research is to design the hydraulics structures on rural irrigation scheme, which include: analysis of irrigation water sufficiency, design of rural irrigation scheme layout, design of pump station, design of open channel, and design of diversion box. The study was conducted in the village of Pekiringan Alit, District Kajen, Pekalongan, Central Java, with two scenarios, i.e. the first scenario with cropping pattern of sugarcane and the second scenario with cropping pattern of corn-beans-melon-tomatoes. Based on analysis, the irrigation water requirements unit of scenario 1 is 0.53 l/dt/ha while for scenario 2 is 0.42 l/dt/ha. The irrigation water requirements can be fulfilled from Sragi River with minimum flow of 537 l/sec. Layout of irrigation scheme consists of 4 irrigated blocks with a total area of 27.15 hectares. Pump station was designed with a capacity of 17.99 l/sec and total dynamic head (TDH) of 14.11 meters. The irrigation water delivery system was designed with three options, i.e. trapezoidal earth channel with a bottom width of 0.3 meters and top width of 0.9 meter, rectangular lining channel with a bottom width and top width of 0.3 meters, and piping channel with a diameter of 4 inches, 3 inches, and 2 inches. The diversion box was designed with dimensions of 0.8 meters height, 0.5 meters width, 0.6 meters length.
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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