Judul: Groundwater management model for irrigation using single and multiple pump operations: a case for data sub-watershed, district of Wajo, South Sulawesi province
Abstrak: One of the causes of decreasing rice production is due to the increase in land conversion rate either at the land high productivity particularly in having limitation land like rain-fed paddy fields. The paddy fields in the District of Wajo, one of the rice production centers in the eastern part of Indonesia, are mostly rain-fed. To increase the productivity of the rain-fed paddy fields, the utilization of groundwater as the source of irrigation water is one of the methods applied by farmers.
Keyword: rain-fed paddy fields, multiple pumps, lithologic map, infiltration with flownet, South Sulawesi

Judul: Kajian Penggunaan Pompa Irigasi untuk Pertanian di Desa Babakan Raden, Kecamatan Cariu, Kabupaten Bogor.
Abstrak: One of the main problems that occur in irrigation supply is the increasing water scarcity at certain times. Actually the water is still available in the basin, it's just necessary some efforts to supply the irrigation needs. Actually the water can be raised by using water pump. If agriculture only depends on surface water and rainfall, it will not be able to increase the productivity of land because the crop water requirement is not fulfilled in some periods. The purpose of this study are determining the irrigation water pricing and finding out profitable irrigated farming. Irrigation water requirement is calculated with CROPWAT 8.0 software by using climate and rainfall conditions as input parameters, and engineering economy is used to calculate irrigation water pricing. The result shows that existence of the pump for lifting up the water to agricultural land could help farmers in increasing cropping intensity and farmers income because the farmers could plant three times a year with cropping pattern rice-rice-secondary crops or rice-rice-vegetables. The most profitable cropping pattern is rice-rice-vegetable because vegetables income is the highest among secondary crops. For sustainable farming, irrigation water cost have to based on irrigation water pricing.
Keyword: 

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