Judul: Etnobotani tumbuhan obat oleh masyarakat sekitar kaki Gunung Salak di Kampung Sinarwangi, Desa Tapos I, Bogor
Abstrak: Tumbuhan yang beranekaragam merupakan sumber utama dalam pemenuhan kebutuhan masyarakat. Pengetahuan mengenai pemanfaatan tumbuhan dikhawatirkan akan hilang seiring dengan perkembangan zaman karena tidak terdokumentasi dengan baik. Penelitian ini bertujuan mempelajari pengetahuan pemanfaatan tumbuhan obat oleh masyarakat di kaki Gunung Salak, Kampung Sinarwangi, Desa Tapos I, Bogor. Metode yang digunakan adalah wawancara kepada satu tokoh kunci dan 20 anggota masyarakat kampung Sinarwangi (responden). Wawancara kepada responden menggunakan metode Pebble Distribution Method (PDM). Hasil penelitian menunjukkan terdapat 46 jenis tumbuhan dari 28 famili yang dimanfaatkan sebagai bahan obat. Tumbuhan-tumbuhan tersebut digunakan untuk mengobati 11 macam penyakit, yaitu hipertensi, hipotensi, kencing batu, luka, menghentikan kebiasaan mengompol, menurunkan kolesterol dalam darah, pegal, perut kembung, sakit gigi, sakit perut, dan setelah melahirkan. Obat tradisional dikemas dalam berbagai bentuk sediaan, seperti segar, larutan, serbuk, tumbukan, dan pepes. Hasil analisis nilai kepentingan lokal menggunakan LUVI diketahui bahwa Staurogyne elongata memiliki nilai tertinggi sebesar 3.51% dan Nilai Kepentingan Budaya (ICS) tertinggi dimiliki oleh Staurogyne elongata, Centella asiatica, Physalis angulata, Coleus atropurpureus, dan Alpinia malaccensis dengan nilai masing-masing sebesar 24.
Keyword: ethnobotany, medicinal plants, Mount Salak

Judul: Etnobotani Masyarakat Sekitar Kawasan Cagar Alam Gunung Simpang (Studi Kasus di Desa Balegede, Kecamatan Naringgul, Kabupaten Cianjur, Jawa Barat).
Abstrak: The relationship between human and their environment, especially related to the use of plants known as ethnobotany. Plants utilization by local communities that based on local culture produced typical knowledge known as traditional knowledge. A change in lifestyle of a society can threaten the existence of traditional knowledge held by the community. This study aimed to determine the type of plants utilization and traditional knowledge in the form of plants used by communities in the surrounding area of Gunung Simpang Nature Reserve. This research was conducted at Miduana Hamlet, Balegede Village, Naringgul Subdistrict, Cianjur Regency, West Java in January, February, and May 2010. Tools and materials used in this study include questionnaires, digital camera, transparent plastic size 40x60 cm, newspapers, hanging labels, plant identification books, alcohol 70%, the data area of Gunung Simpang Nature Reserve, and demography of Balegede Village, while the object was Miduana Hamlet’s community and surrounding vegetation. Data collected include primary and secondary data. Primary data included the data of plants used by the respondents. This data was collected through semi-structured interviews on 30 respondents, direct observation, and making herbarium. Respondents selected using snowball sampling technique. The secondary data included the condition of Gunung Simpang Nature Reserve and demography of Balegede Village. Data analysis was performed by classifying the use of plants to 13 groups of usage, calculating the percentage of habitus and the percentage of parts used, and analyzes preference ranking and use value. The communities of Miduana Hamlet used 191 plant species from 69 families that classified into 13 group of usage. They used 62 species for food, 74 species for medicinal purpose, 43 species for ornament purpose, 19 species for indigenous utility, 14 species for building materials, 12 species for cattle feeding, 12 species for aromatic purpose, 9 species for firewood, 14 species for ropes, wickerwork, and crafts, 4 species for dyes, 4 species to exceed pest, 4 species for beverage, and other uses as many as 7 species. Although traditional knowledge of plants used in Miduana Hamlet already decrease, there were some people who still keep the values of traditional knowledge that was visible from the activities of plants used, conservation efforts to utilized plant, and still doing some traditions related to respect for the rice (Oryza sativa).
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Judul: Bifurkasi Hopf pada Model Siklus Bisnis Kaldor Kalecki tanpa dan dengan Waktu Tunda
Abstrak: Business cycle model is one of dynamical system models in economic. One of the business cycles model is Kaldor-Kalecki model. Kaldor-Kalecki business cycle model that is written in delayed defferential equations, is a business cycle model that involves gross product and capital stock of a company. In this paper Kaldor-Kalecki business cycle model is analyzed using both nondelay and delay in time of capital stock. By Taylor expansion for the time delayed model, an analysis of stability around the fixed points has been done. Furthermore, by using Hopf bifurcation theorem, it can be shown that there exists periodic orbits and limit cycle. In the nondelayed model, changing the parameter of goods market could lead to the occurrence of Hopf bifurcation and the existence of limit cycle. Similarly, for the delayed model, it has been shown that changing the time delay parameter may result in the occurrence of Hopf bifurcation and limit cycle.
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