Judul: Pemanfaatan SWA (super water absorbent) Pati Singkong untuk Meningkatkan Ketersediaan Air pada Tanaman Jagung (zea mays) di Tanah Bertekstur Liat
Abstrak: Water shortage for plant growth is one of the most problem in dry-land system agriculture. An attempt that can overcome this problem is application of water absorbent that can absorb amount water and increasing water supply for plant growth. SWA (Super Water Absorbent) cassava starch can be a choice for this purpose. This study was aimed to assess the effect of SWA cassava starch and its comparison to the other water absorbent, for corn plant growth in clay-textured soil (podsolik). The experiment applied Randomized Completely Design, and the treatment is irrigation ratio: each three days, each seven days and each fourteen days. The results showed that the use of SWA cassava-starch on each-fourteen-days-irrigation-ratio was significantly different on corn plant growth. Although this treatment gave a good result, but generally this treatment did not give a better result than each-three-days-irrigation ratio.
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Judul: Pengaruh SWA (Super Water Absorbent) Pati Singkong Terhadap Sifat Retensi Air Tanah
Abstrak: The development of dry-land agriculture often face some constraints, especially when it is related to water needs which is depending on rainwater. Global climate change, that occurs lately has made rainfall patterns become more erratic and less predictable. Therefore, new technology that could help maintaining soil water content is needed to ensure that water availability for plant growth is still sufficient. SWA (Super Water Absorbent) cassava starch is one of a technology that can be used for this purpose. This study was aimed to assess the effect of SWA cassava starch and its comparison to the other water absorbent, for maintaining soil water retention on two different soil textures (clay and sandy clay). The results showed that addition of SWA cassava starch was not significantly different from the other soil water absorbent for maintaining soil water retention. SWA cassava starch performance at clay textured soil was better than sandy clay-textured soil.
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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