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: Beberapa aspek biologi reproduksi pada buaya
Abstrak: Tulisan ini bertujuan untuk mengetahui hubungan biolo- gi reproduksi buaya seperti organ reproduksi, saa, dewasa kelamin, tingkah laku kelamin, masa bersarang dan penetasan telur dalam hubungannya dengan pelestarian satwa ini. Buaya termasuk amniota yang bersifat carnivora. Ter- dapat sisik epidermal sepanjang tubuhnya. Mempunyai lam- aung pengunyan yang mirip gizzard Letapi tidak mempunyai vesica urinaria. Kaki depan terdiri dari 5 jari, kaki be- lakang terdiri dari 4 jari dan ada cakar sejati. Organ reproduksi buaya jantan terdiri dari testes, epi- didymis, ductus deferens dan penis. Organ reproduksi buaya betina terdiri dari ovarium, oviduct, uterus dan klitoris. Penis dan klitoris berada di ruang kloaka yang paling luar. Oviduct dan uterus mempunyai kelenjar penghasil albumin dan kerabang untuk melapisi sel telur sebelum telur dikeluarkan. Mempunyai dua macam gonadotropin, yaitu FSH dan LH. Dewasa kelamin dicapai pada umur ± 2,5 tahun dimana panjang tubuh maksimum belum tercapai. Buaya mengeluarkan suara yang khas dan bau yang merangsang pasangannya sepan- jang musim kawin. Telur buaya berkerabang keras, berwarna putih atau putih kekuningan dengan bercak-bercak coklat kemerahan. Ukur- annya bervariasi dengan panjang 6,1 - 9,9 cm, lebar 4,2 - 5,7 cm, volume 90 -105 ml dan beratnya 66 - 140 gram. Ada dua macam bentuk sarang yaitu berbentuk gundukan dengan ceruk berbentuk V di atasnya (Crocodylus porosus dan C. novaeguineae) dan berbentuk lubang (C. siamensis dan C. palustris). Masa bersarang untuk sarang berbentuk gundukan adalah pada waktu musim kering dan yang berbentuk lu- bang pada awal musim hujan. Masa pengeraman pada spesies C. porosus 40 - 90 hari, C. novaeguineae 77 - 83 hari, C. palustris C.. siamensis 40. - 60 hari dan tidak ada catatan pada spesies Pada C. porosus dan C. palustris ada kebiasaan induk dalam menjaga sarangnya selama pengeraman, anak bersuara di dalam telur sehingga merupakan panggilan kepada induknya untuk membantu membuka sarang untuk merangsang penetasan te- lur dan membebaskan anaknya dari dalam sarang. Dua spesies lainnya tidak mempunyai sifat semacam ini….
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