Judul: Pengembangan model pengelolaan sungai berbasis pada konsep ekohidrolik (studi kasus Sungai Lawo Kabupaten Soppeng Provinsi Sulawesi Selatan)
Abstrak: managing river environment. The ecological issues in this research is the vegetation grown in the river bank as flood retention, while hydraulical aspect refers to the flows of water in river bank to reduce flooding. The aims of the research were : 1) to develop a river management model based on ecohydraulic concept; to characterize the optimal width of riverbank and appropriate vegetation; 2) to develop government policies to support river management based on ecohydraulic concept, and 3) to study the implementation of the model at Lawo River of Soppeng Regency. The output of river management model can be used as the recommendation of demarcation line of the river, while the policies can be used as a basis of policies of local government. As the implementation of the models, the data were collected from the Lawo River South Sulawesi between May 2010 to December 2010. River management model is based on ecohydraulic concept, it uses six variables were rainfall intensity, channel roughness, water level (without management), land use score, flooding and the height of inundation. The policies model were developed in four steps : community participation level, study of social economic condition of community, study of effect social economic condition to the participation and study of policies of river management. The policies model can be used to determine scenarios and strategic activities which can effect the implementation of river management model. The optimal width of riverbanks at Lawo River varies between 100 m and 150 m with vegetation diameter between 10 cm and 20 cm. This implies to the flooding water level less then 2.5 m and velocity of flow can be reduced to 76%. The best scenario found in this research suggests the improvement of infrastructure in order to increase the value of land. The best government program is increasing the population of vegetation in the river bank.
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Judul: Model Bantaran Sungai Ciliwung Dengan Pendekatan Ekohidraulika Di Lokasi Kelurahan Sempur,
Abstrak: The effort to control and flood prevention can be started with managing and structuring the area of the river, as known river restoration. River restoration is an attempt to restore the functions of the river physically, ecologically, socially and economically so that it becomes a natural stream (nature-like river) and resemble the initial conditions in order to reduce the danger of flooding and damage the river. The purpose of this study are : 1) Identifyied the damage along the riverbanks of the Ciliwung River in Kelurahan Sempur, 2) Made the river restoration concept with ecohydraulics approach. The result of this research was design of riverbank restoration with eco-hydraulics approach using plants. From the research, it is found that Ciliwung River which passing Kelurahan Sempur have a significant function for flooding retention. Based on the research, there is some damage to the river in this section, for example the erosion and sedimentation in the downstream. This is because the slope of the riverbed is very small. The design of river management is by adding vegetation on the riverbanks and flood plain areas.
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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