Judul: Species Diversity and Conservation Strategy of Butterfly in Taman Hutan Kampus IPB Dramaga Bogor
Abstrak: Taman Hutan Kampus diketahui memiliki beberapa tipe habitat dan diduga memiliki potensi keanekaragaman kupu-kupu serta tumbuhan pakan dan tumbuhan inang yang berbeda. Penelitian ini bertujuan untuk menganalisis keanekaragaman dan komposisi jenis kupu-kupu, menginventarisasi tumbuhan inang dan tumbuhan pakan kupu-kupu, serta menyusun strategi konservasinya di empat tipe habitat Taman Hutan Kampus. Metode yang digunakan yaitu pollard transect dan trap. Data yang diambil pada penelitian ini adalah jumlah jenis dan jumlah individu kupu-kupu, jumlah jenis tumbuhan pakan dan tumbuhan inang kupu-kupu, serta karakteristik habitat. Hasil menunjukkan terdapat 66 jenis kupukupu dengan total sebanyak 975 individu, teridentifikasi sebanyak 89 jenis tumbuhan inang dan 62 jenis tumbuhan pakan kupu-kupu. Nilai kekayaan, keanekaragaman, dan kemerataan jenis kupu-kupu tertinggi terdapat di tipe habitat lahan tertutup. Nilai kesamaan komunitas tertinggi diperoleh di tipe habitat lahan terbuka dan kebun sawit. Upaya kegiatan konservasi seperti pengamatan secara berkala, penanaman tumbuhan inang dan pakan, serta pembuatan feeding site dan penangkaran perlu dilakukan untuk menjamin kelestarian keanekaragaman jenis kupu-kupunya.
Keyword: butterfly, conservation, diversity, food plant

Judul: The Change in Composition of Butterfly Diversity on IPB Dramaga Campus in Bogor
Abstrak: Kampus Institut Pertanian Bogor Dramaga memiliki keanekaragaman hayati yang tinggi, salah satunya adalah keanekaragaman kupu-kupu. Keanekaragaman kupu-kupu dapat mengalami perubahan seiring berjalannya waktu yang disebabkan oleh perubahan iklim dan lingkungan. Penelitian ini bertujuan untuk mengetahui keanekaragaman, kemerataan, dan kesamaan jenis kupu-kupu di Kampus IPB Dramaga, serta mengetahui perubahan keanekaragaman jenis kupu-kupu di kawasan Kampus IPB Dramaga setelah mengalami perubahan tersebut. Pengambilan data dilakukan dengan metode Pollard transect dan mendapatkan 116 individu kupu-kupu yang terdiri dari 28 jenis. Kupu-kupu yang ditemukan terdiri dari 4 famili, yaitu Pieridae, Nymphalidae, Papilionidae, dan Lycaenidae. Keanekaragaman jenis kupu-kupu tertinggi berada pada lokasi Danau SDGs dengan nilai 2,12. Nilai kemerataan jenis kupu-kupu tertinggi yaitu pada lokasi Taman Konservasi dengan nilai 0,97. Tingkat kesamaan jenis tertinggi terjadi antara lokasi Danau SDGs dan Jalan Ulin dengan nilai 0,38. Secara umum, keanekaragaman kupu-kupu di Kampus IPB Dramaga mengalami penurunan dalam kurun waktu 10 tahun., IPB University has high biodiversity, one of which is butterfly diversity. Butterfly diversity can change over time due to climate and environmental changes. This study aims to determine the diversity, evenness, and similarity of butterfly species in the Dramaga Campus of IPB, and to determine changes in the diversity of butterfly species in the area of the Dramaga Campus of IPB after experiencing these changes. Data was collected using the Pollard transect method and obtained 116 butterfly individuals consisting of 28 species. The butterflies found consisted of 4 families, namely Pieridae, Nymphalidae, Papilionidae, and Lycaenidae. The highest diversity of butterfly species is in the Lake SDGs location with a value of 2,12. The highest evenness value of butterfly species is at the Conservation Park location with a value of 0,97. The highest level of similarity occurs between Lake SDGs and Jalan Ulin with a value of 0,38. In general, the diversity of butterflies on the Dramaga Campus of IPB has decreased over the past 10 years.
Keyword: butterflies, IPB Dramaga, species diversity, species evenness, species similarity

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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