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: Sensitivitas Produksi Kelapa Sawit (Elaeis guineensis Jacq.) Terhadap Variabilitas Curah Hujan Akibat Pengaruh Penyimpangan Iklim
Abstrak: The aims of this study is to assess the impact of ENSO (El Nino and Southern Oscillation) and IOD (Indian Ocean Dipole) to rainfall variability in Marihat and Bekri Plantation and the reation with palm oil production. The correlation between those ENSO and IOD events with rainfall variability and palm oil production was analyzed using Canonical Correlation Analysis. This method uses two variables, which are rainfall and palm oil production as a Dependent variables and SOI (Southern Oscillation Index), Sea Surface Temperature Anomaly of Nino 3-4 region (120°W-170°W and 5°S- 5°N) and DMI (Dipole Mode Index) as an Independent variables. The result of this study indicates that SOI, SSTA and DMI not closely related to rainfall in those two plantations area. Statistical analysis revealed that ENSO and IOD significantly related to rainfall in Marihat plantation on the same month until 4th month (lag 0-4) and on the 8th - 12th month (lag 8-12). Fluctuation of palm oil production due to the impact of ENSO and IOD will start on 4th-11th month after water stress occurrence. The most impacted area in Marihat Plantation is Helvetia. In Bekri plantation, the correlation between climate deviation and rainfall is stronger. According to statistical analysis, ENSO and IOD significantly related to rainfall in Bekri plantation on the same month (lag 0) and 7th – 9th month (lag 7-9). It means that the impact of ENSO and IOD to fluctuation palm fruit production will be on the next 7th – 9th month after water stress occurrence.
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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