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: Pemanfaatan Water Absorbent untuk Meningkatkan Retensi Air Tanah dan Pertumbuhan Tanaman Jagung (Zea mays L.)
Abstrak: Water availability is one of principal problem in the system of dry-land farming, especially for food crops. Every plants needs constant water supply to grow, but this is not obtained in dry land farming that rely mainly on rain as a water resource. The lack of water availability in dry season caused decreasing of plant’s growth and productivity. In order to increase water availability, this research is using super water absorbent (SWA) from cassava’s starch to hold water and release it slowly. The purposes of this research are analyzing the impact of cassava’s starch SWA to the volume of water that is retained by soil and growth of corn (zea mays L). The result showed that application of water absorbent tend to increase the ammont of water retained by soil, eventhough the effect was not significant. Application of water absorbent result in significanly better corn growth as compared to control (no water absorbent). Nevertheless the application of water absorbent fail to maintain crop growth at optimum level. The treatment that retained most water is cassava starch SWA with 0.2 g/kg the dosages of spread mix in soil make every 14 days watering. While, application of cassava’s starch with 0.1 g/kg the dosages of concentrate in soil make every 14 days watering has a significant with the high and leaves’s wide, but not with the number it.
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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