Judul: Landslide Vulnerability Analysis in Cisolok Subdistrict and Evaluation of Rainfall Threshold Value in Sukabumi District.
Abstrak: Bencana longsor sangat sering terjadi dan menjadi ancaman serius di wilayah Kecamatan Cisolok, Kabupaten Sukabumi. Fenomena yang berbentuk gerakan massa tanah atau batuan penyusun lereng yang bergerak kebawah atau menuruni lereng ini disebabkan oleh berbagai faktor seperti geomorfologi, struktur batuan, hidrologi, dan tata guna lahan. Penelitian ini bertujuan untuk memetakan daerah rawan longsor di Kecamatan Cisolok serta mengetahui nilai ambang batas curah hujan penyebab longsor di Kabupaten Sukabumi. Metode weighted overlay digunakan untuk membuat peta kerawanan longsor. Penentuan nilai ambang batas curah hujan menggunakan metode sorting dan di lakukan validasi menggunakan metode analisis Gerombol tak ber-hierarki K-means. Hasil penelitian menunjukkan bahwa sekitar 64% atau 109 km2 dari total luas wilayah Kecamatan Cisolok memiliki tingkat kerentanan tinggi, sementara sekitar 5,8km2 wilayah ini memiliki tingkat kerentanan yang sangat tinggi, terutama di Desa Sirnaresmi. Hasil analisis diperoleh nilai ambang batas curah hujan tertinggi yakni sebesar 41 mm/hari. Penelitian ini berkontribusi penting dalam upaya mitigasi dan pengurangan risiko bencana longsor di Kabupaten Sukabumi.
Keyword: Landslide, rainfall, vulnerability, mitigation, mapping

Judul: Landslide Susceptibility Mapping  Using the Frequency Ratio Method: Case Study in Cigombong Sub District,  Bogor District.
Abstrak: Pemetaan tingkat kerawanan longsor merupakan langkah penting dalam upaya mitigasi bencana alam dan perlindungan masyarakat. Peta tingkat kerawanan longsor dengan menggunakan metode tertentu telah tersedia, namun peta tersebut tidak selalu sesuai bagi wilayah tertentu. Penelitian ini bertujuan memetakan tingkat kerawanan longsor di Kecamatan Cigombong dan menganalisis tingkat akurasi metode yang digunakan, yaitu metode rasio frekuensi. Parameter yang digunakan adalah kemiringan lereng, ketinggian tempat, curah hujan, geologi, jenis tanah, kelengkungan bumi, arah lereng, dan tutupan lahan. Akurasi peta kerawanan longsor dianalisis menggunakan analisis Receiver Operating Characteristic (ROC). Hasil analisis menunjukkan parameter kemiringan lereng merupakan faktor paling berpengaruh terhadap longsor di Kecamatan Cigombong dengan bobot sebesar 41,2. Zonasi kerawanan longsor kelas tinggi dan sangat tinggi mencakup 35% luas wilayah di Kecamatan Cigombong. Uji validasi metode rasio frekuensi menghasilkan akurasi sebesar 82,4 % pada tingkat keberhasilan dan akurasi sebesar 80% pada tingkat prediksi AUC yang termasuk dalam kategori baik
Keyword: AUC, Rasio Frekuensi, Bogor, Longsor, Pemetaan Kerawanan

Judul: Responses on Performance and Minerals Digestibility by Novel Consensus Bacterial 6-Phytase  Variant (PHY-G) Supplementation in Broiler Diet
Abstrak: Plant feedstuffs normally contain phytic acid which poorly hydrolized by monogastric especially broiler. Further, 80% of phosphorus (P) in plant feedstuff is complexed with phytic acid. In that case, high amount of inorganic P sources is needed to fulfill P requirement. Since it has capability to bind with some nutrients such as bi- or trivalent minerals and amino acids then phytase is widely utilized in poultry feed to improve the nutrient digestibility. Today, the use of 500-1000 FTU phytases in poultry feed is widely applied by feed industry and its capability releasing phytate-bound phosphorus is very well documented. Novel consensus bacterial 6-phytase variant (PHY-G) is newest 6-phytase derived from bacterial phytase gene Buttiauxella sp. expressed in Trichoderma reesei with enhanced functionality for better phytic acids degradation. The present research was conducted to evaluate the efficacy of PHY-G in different doses (1000, 1500 and 2000 FTU/kg) on high phytic acids content diets which at least contained 0.30% Phytate-P. A total 3,675 male broilers Indian River/IR (105 pens, 35 birds/pen) were provided mixed grain diets in seven treatments with fifteen replications, they were divided into two phases of rearing which were starter (1 – 21 d) and finisher (22 – 35 d). Treatments were positive control (PC) using standard diet following IR’s nutrient requirement, negative control 1 (NC1) with nutrient reduction at 0.21 percent unit calcium (Ca), 0.21 percent units available phosphorus (AvP), 0.34 percent unit crude protein (CP) and 66 kcal/kg AME, NC2 with nutrient reduction at 0.23 percent unit Ca & AvP, 0.45 percent unit CP and 75 kcal/kg AME, followed by NC3 with nutrient reduction at 0.24 percent unit Ca & AvP, 0.52 percent unit CP and 79 kcal/kg AME. PHY-G supplementation with dose 1000, 1500 and 2000 FTU/kg on top of NC1, NC2 and NC3 respectively. PHY-G supplementation at any level significantly improved body weight gain/BWG and corrected FCR/McFCR (P<0.05) on starter (1,083 – 1,093 g/bird) and overall phase (2,482 – 2,532 g/bird) compared to any NCs (1,063-1,084 g/bird on starter and 2,387 – 2,398 g/bird on finisher). No significant different were observed on mortality of all treatments but PHY-G supplementation significantly improved (P<0.05) broiler index/BI (444 - 463) versus NCs (427 - 430) and able to maintain it equivalent to PC (455). Toe ash was significantly improved (P<0.05) by all doses of PHY-G (13.28 – 13.56%) compared to NC (12.3 – 12.7%). Apparent ileal digestibility (AID) of Ca was not affected by PHY-G but 1000, 1500 and 2000 FTU/kg PHY-G supplementation significantly improvemed on AID of P (P<0.05) which were 64.97%, 75.60% and 78.29% compared to NCs (42.64%, 48.88% and 46.17% for NC1, NC2 and NC3 respectively). This These data indicated that PHYG supplementation effectively improved broiler growth performance, bone mineralization and P digestibility at any level of dose on high content of phytic acid in the diets.
Keyword: broiler, growth performance, phytase, phytic acid, toe ash