Judul: Evapotranspiration Modelling for Oil Palm Plantation Using Soil and Water Assesment Tool (SWAT) (Case Study: PTPN VI Batanghari)
Abstrak: Ekspansi perkebunan kelapa sawit di Indonesia meningkat pesat, salah satunya di Kabupaten Batanghari Provinsi Jambi-Indonesia, PT Perkebunanan Nusantara VI Batanghari. Wilayah di sekitar pertanaman kelapa sawit mengalami permasalahan air terutama pada musim kemarau. Hal tersebut dikarenakan perubahan fungsi lahan dari ekosistem alamiah menjadi pertanaman kelapa sawit. Di samping itu, ketersediaan sumberdaya air dimanfaatkan oleh masyarakat baik untuk kebutuhan rumah tangga maupun ekonomi. Oleh karena itu penting untuk mengetahui perpindahan air dari suatu tempat ke tempat lainnya untuk memudahkan pengelolaan air. Penelitian ini bertujuan menganalisis fluks uap air meliputi evapotranspirasi, serta mendapatkan nilai aliran, dan penyimpanan air di pertanaman kelapa sawiit. Penelitian fluks uap air ini menggunakan SWAT (Soil and Water Assesment Tool) dalam permodelannya serta divalidasi dengan teknik EC (Eddy Covariance). Hasil dari permodelan tersebut berupa grafik debit aliran, dan evapotranspirasi (ET)., The expansion of oil palm plantations in Indonesia is increasing rapidly, included in Batanghari Regency, Jambi Province Indonesia. PT Perkebunan Nusantara VI Batanghari as the study area is entirely oil palm plantation. Areas around oil palm plantations experience water problems, especially during the dry season. It is due to landuse changes from natural ecosystems to oil palm plantations. In addition, the availability of water resources is utilized by the community for both household and economic needs. Evapotranspiration plays an important role in determining plant water requirements, climate patterns, and water management. This study aims to analyze water vapor fluxes including evapotranspiration, as well as to obtain discharge flow and water storage in oil palm plantations. The software used to assist the modeling is SWAT (Soil and Water Assessment Tool) in the modeling and validated by the EC (Eddy Covariance) technique. The results of the modeling are in the form of discharge graphs, and evapotranspiration (ET).
Keyword: Water Flux, Water Balance, SWAT, Model Simulation

Judul: Comparison of Evapotranspiration Dynamics between Oil Palm Plantation and Secondary Forest in Jambi Province
Abstrak: Kelapa sawit merupakan salah satu komoditas perkebunan utama Indonesia dan berperan penting dalam perekonomian nasional. Karena memiliki nilai ekonomi yang sangat tinggi, perkebunan kelapa sawit telah berkembang pesat di seluruh Indonesia. Namun, konversi lahan alam menjadi perkebunan kelapa sawit telah menimbulkan sentimen negatif dari dunia internasional terhadap Indonesia, kelapa sawit dianggap boros air dan menjadi penyebab kekeringan. Penelitian ini bertujuan untuk menganalisis dinamika dan laju evapotranspirasi pada perkebunan kelapa sawit dengan menggunakan beberapa metode sebagai pembanding. Metode yang digunakan dalam penelitian ini antara lain metode Aerodinamik dan metode Penman-Monteith untuk estimasi, serta metode Eddy Covariance sebagai referensi. Laju evapotranspirasi yang diperoleh kemudian dibandingkan dengan kawasan hutan untuk melihat perbedaan laju evapotranspirasi antara ekosistem buatan, PTPN VI Jambi, dan ekosistem alami, Hutan Harapan Jambi. Dinamika diurnal laju evapotranspirasi di perkebunan kelapa sawit dan hutan menunjukkan pola yang sama, yaitu meningkat pada siang hari dan menurun pada malam hari. Laju evapotranspirasi di Hutan Harapan memiliki nilai lebih tinggi, yaitu 6,1 mm/hari dibandingkan dengan perkebunan kelapa sawit yang hanya 4,42 mm/hari. Hasil ini dapat membantah sentimen negatif terhadap kelapa sawit, terutama terkait penggunaan air., Palm oil is one of Indonesia's primary plantation commodities and plays a crucial role in the national economy. It has a very high economic value, so palm oil plantations have expanded widely across Indonesia. However, converting natural land into palm oil plantations has led to negative international sentiment towards Indonesia, palm oil is seen as “water greedy” and a cause of drought. This study aims to analyze the dynamics and rate of evapotranspiration in palm oil plantations using several methods for comparison. The methods used in this research include the Aerodynamic method and the Penman-Monteith method for estimation, and the Eddy Covariance method as a reference. The evapotranspiration rates obtained are then compared with forest areas to observe the differences in evapotranspiration rates between the man-made ecosystem, PTPN VI Batanghari, Jambi, and the natural ecosystem, Hutan Harapan, Jambi. The diurnal dynamics of evapotranspiration rates in both the palm oil plantations and the forest show similar patterns, increasing during the day and decreasing at night. The evapotranspiration rate in Hutan Harapan is higher at 6.1 mm/day compared to the palm oil plantation at 4.42 mm/day. These results counter the negative sentiment towards palm oil, particularly regarding its water usage.
Keyword: penman-monteith, forest, evapotranspiration, oil palm, aerodynamics

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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