Judul: Pengaruh El Niño Southern Oscillation (ENSO) dan Indian Ocean Dipole (IOD) terhadap Produktivitas Kelapa Sawit
Abstrak: The influence of El Niño Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) to the productivity of palm oil can be investigated from Sea Surface Temperature anomalies (SSTa), it used cross-correlation analysis (the temporal) and Pearson correlation (the spatial) with α=0.05. Temporal correlation analysis shows that Kebun Kertajaya has the highest correlation at determination of sex ratio phase (lag 17) with a value of 0.37, and Kebun Pino Talo at anthesis phase (lag 6) with a correlation value of -0.53. Spatial correlation analysis shows a strong negative correlation of the productivity of Kebun Kertajaya and Kebun Talo Pino with SSTa on the inflorescence initiation phase and the sex determination respectively. While at the development of flower phase both plantations a positive relationship. Either positive or negative strong correlation in both plantations that has monsoonal rainfall patterns indicate that the ENSO and IOD affect the development of flower and the productivity of palm oil. Meanwhile, the Kebun Sungai Aur that has the equatorial rainfall pattern, did not show a strong relationship between the productivity of palm oil and SSTa, both temporally and spatially. Thus the phenomenon of ENSO and IOD do not have a significant effect on the Kebun Sungai Aur.
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Judul: Analisis Dampak ENSO (El-Nino Southern Oscillation) Terhadap Tingkat Kekeringan Untuk Tanaman Pangan dan Palawija (Studi Kasus : Sulawesi Selatan)
Abstrak: Climate and weather variability is a condition of long-term climate change is marked by fluctuations and deviations from normal conditions. One reason is the ENSO (El-Nino Southern Oscillation) which affects the drought. This research was conducted with the aim to determine and analyze the level of drought in South Sulawesi due to the influence of ENSO and compare the production of food crops and crops in a normal year and ENSO. Drought index is calculated based on the Palmer method by using rainfall data, air temperature and soil humidity as inputs. Based on the drought index calculated using the Palmer method, areas with monsoon rain patterns have a range of values between -22.71 to dryness 18.23, equatorial patterns ranged from -4.03 to 5.07, and the local patterns ranged from -8.57 to 10.07. Verification test results of the drought index of crop production data show that each ENSO event is always followed by a decline in rice production, especially of rice fields. As for crops, crop production generally tended to increase in every ENSO event because most crops are plants that are resistant to drought, particularly local varieties that have adapted well to its environment. Thus, the influence of ENSO drought can affect the production of food crops and crops.
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Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf