Judul: Mapping and Analysing of Landslide Hazard Zone and its Mitigation Using Geographic Information System (Case Study in North Sumedang and South Sumedang Subdistric, Sumedang Distric, West Java)
Abstrak: Landslide is the natural disaster that most frequently occurred in the study area of North Sumedang and South Sumedang subdistric. The existing of landslide hazard and risk map s are not yet adequate to be use in policy making. The aim of the research is to provide potential hazard and risk maps to mitigate landslide hazard using geographic information system technology. The result showed that most area in the North Sumedang and South Sumedang subdistrict is moderate landslide hazard covered 8.460 Ha (65,51%), high landslide hazard covered 2.798 Ha (21,67%), low landslide hazard covered 1.570 Ha (12,16%) and very low landslide hazard covered 85 Ha (0,66%). Combining landslide hazard with property value has produced map of landslide risk. Neverthe less most areas are low risk class (7.962 Ha/61,67%) and the high risk areas are only occurred in small places (568 Ha/4,4%). This phenomena showed that area with high potential class of landslide hazard is not always having a high value of risk. The risk is determined by properties value such as: infrastructure, road network and land use, while the landslide hazardous class is determined by natural factors such as: slope, soil type, geology and land use.
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Judul: Studi Geomorfologi dan Analisis Bahaya Longsor di Kabupaten Agam, Sumatera Barat
Abstrak: Sumatra is an active tectonic-volcanic island located in the collision of Indo-Australian and Eurasian plates. The movement of the plates often caused natural disasters and one of which led to landslide. Landslides are one of geomorphic processes which often times generating a disaster in Sumatra. Agam Regency is one of the administrative areas in Sumatra where the landslides have frequently been taken place. This research aims to (1) learned geomorphological condition of Agam Regency and (2) to assess landslides susceptibility and hazard. The methods of assessment used were Multi-Criteria Evaluation (MCE) and the parameters comprise slopes, lithology, precipitation, soil, and land cover/land use. Those parameters were analyzed by geographical information system (GIS) technique using score and weighting. Ground checked has been hold for validating tentative result of analysis and collecting primary data. The result showed that the geomorphology of Agam Regency characterized by the plain area in western part and hilly/mountainous area in the middle and eastern parts (the so called Bukit Barisan Mountain). Based on landslides susceptibility analysis, it indicates that 54.3 % of Agam Regency classified as safe area (1211.5 km²) and conversely 18.6 % as severely susceptible area (414.7 km²). According to landslides hazard analysis, it shows that 51.3 % of Agam Regency classified as safe area (1146.7 km²) and contrarily 13.6 % as severely hazard area (303,6km²). Geomorphologically, all severe class of landslides susceptibility and hazard areas situated in the hilly/mountainous areas possessing slopes steepness of 15 % to > 40 %.
Keyword: Agam Regency, GIS, hazard, susceptibility, landslide, geomorphology

Judul: Penambahan α-Tocopherol sebagai Antioksidan dalam Pengencer Tris Kuning Telur Spermatozoa Kucing pada Suhu 4 ⁰C
Abstrak: Stres oksidatif pada sperma terjadi selama pengolahan semen dan berdampak pada kerusakan sperma. Antioksidan α-Tocopherol merupakan salah satu antioksidan yang termasuk ke dalam kelompok antioksigen. Antioksidan ini dapat mengurangi aksi radikal bebas dan menurunkan stress oksidatif pada sperma. Penelitian ini bertujuan menguji efektivitas penambahan α-tocopherol pada pengencer tris-kuning telur terhadap kualitas semen cair yang berasal dari kauda epididimis kucing. Kauda epipidimis kucing didapatkan dengan metode kastrasi. Kauda epididimis kemudian dipisah dan dicacah untuk mendapatkan spermatozoa kucing. Semen dengan motilitas >70% diencerkan pada kelompok pengencer tris kuning telur (TKT), tris kuning telur dengan α-tocopherol 0.1% (TKT+T-0.1%), tris kuning telur dengan α-tocopherol 0.2% (TKT+T-0.2%), dan tris kuning telur dengan α-tocopherol 0.3% (TKT+T-0.3%). Semen cair disimpan selama 4 hari (H0-H4) pada suhu 4 °C, kemudian dilakukan evaluasi kualitasnya (motilitas, viabilitas, abnormalitas dan membran plasma utuh sperma) setiap 24 jam. Hasil penelitian menunjukkan kualitas semen cair tidak berbeda signifikan pada H0 (P>0.05), tetapi penambahan α-tocopherol secara umum meningkatkan kualitas semen pada H4 pascapreservasi. Berdasarkan hasil penelitian, kelompok pengencer TKT+T-0.1% adalah perlakuan terbaik.
Keyword: antioksidan, kucing, tris kuning telur, α-tocopherol, radikal bebas