Judul: Herpetofauna Trade Via E-commerce in Indonesia
Abstrak: Pemasaran satwa liar dalam skala komersial saat ini berkembang melalui platform perdagangan elektronik, namun penelitian terkait perdagangan satwa liar di Indonesia khususnya herpetofauna melalui media internet masih terbatas. Penelitian ini bertujuan untuk menelaah perdagangan herpetofauna pada platform e-commerce yang populer di Indonesia yaitu Tokopedia, Shopee, Lazada dan Bukalapak dengan metode pengambilan data melalui aplikasi web scraping. Hasil penelitian didapatkan sebanyak 117 jenis herpetofauna dari 38 famili, yang terdiri dari 106 jenis reptilia dan 11 jenis amfibia. Kategori produk yang paling banyak ditawarkan adalah satwa hidup sebagai hewan peliharaan. Sebanyak 6 jenis termasuk dalam satwa dilindungi menurut Permen LHK No. 106 tahun 2018 yaitu Crocodylus porosus (buaya muara), Morelia viridis (sanca hijau), Python bivittatus (sanca bodo), Orlitia borneensis (kura-kura byuku), Varanus nebulosus (biawak abu-abu) dan Varanus panoptes (biawak argus). Perdagangan herpetofauna terbanyak terdapat di Jawa Barat kemudian Jakarta. Total nilai ekonomi yang dihasilkan selama tahun 2017 sampai 2022 sebesar Rp3.355.750.470., Sales of wildlife use on a commercial scale has now developed into various online platform, however research related to wildlife trade in Indonesia, especially herpetofauna through the internet is still limited. This study aims to examine the herpetofauna trade on a popular e-commerce platform in Indonesia, namely: Tokopedia, Shopee, Lazada and Bukalapak using web scraping application data retrieval method. The results recorded 117 species of herpetofauna from 38 families, comprising of 106 species of reptiles and 11 species of amphibians. The most offered product category is live animals as pets. Six species are included under the protected animals list according to the Ministry of Environment and Forestry No. 106 from 2018, namely Crocodylus porosus (saltwater crocodile), Morelia viridis (green tree python), Python bivittatus (burmese python), Orlitia borneensis (Malaysian giant turtle), Varanus nebulosus (clouded monitor) and Varanus panoptes (argus monitor). The most herpetofauna trade is in West Java, then Jakarta. The total economic value during the period of 2017 to 2022 is IDR 3,355,750,470.
Keyword: amphibian, economic value, reptile, trade

Judul: Perdagangan reptilia sebagai binatang peliharaan di DKI Jakarta
Abstrak: DKI Jakarta in the world of wildlife trade is often referred as yellow dots, a city vulnerable to illegal trade. Wildlife trade in DKI Jakarta consists not only on ornamental fish, mammals and birds, but even reptiles. This study aims to describe trade locations, identify species of trade and analyze preferences of pet reptiles. The study was conducted in five traditional markets and 35 pet shops in DKI Jakarta, using interviews and investigative methods. I also carried out survey on cyber-market trade and interviews to pet reptile owners. The study was carried out from August 20th to November 20th, 2010. A total of 52 species (26 species of turtles, 23 snakes and three lizards) were traded on traditional markets, and 46 species (21 species of turtles, 19 species of snakes and six species of lizards) at the pet store. In traditional markets the common species sold are local species, but not on pet stores where most are imported species. In total, survey found five species of protected reptiles according to PP No. 7 of 1999, four species of Appendix I CITES’s reptiles and six species listed as critically endangered by IUCN Red List. Three forums in internet carried out cyber markets of pet reptiles. The most favorite pet reptiles were snakes, especially the ball python (Python regius).
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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