Judul: Pengaruh Jarak dari Hutan dan Kondisi Lanskap Pertanian terhadap Keanekaragaman Hymenoptera
Abstrak: Landscape conditions have an enormous role in determining the level of biodiversity. Complexity of habitats has been known to be associated with the increase of spesies richness. The purpose of this research is to study the effect of distance from the forest and agricultural landscapes toward abundance and diversity of hymenoptera in vegetable crops. A survey was conducted in the month of August 2012 until October 2012 at eight different habitats in Cisarua, Megamendung, Tamansari, Caringin and Cigombong from Bogor District. The habitat observed is divided into four criteria: habitats that are located within 0 to 500 m, 500 to 1000 m, 1000 to 1500 m, and 1500 to 2600 m from the forest. Sampling was done by installing 4 to 15 Yellow Pan Trap (YPT) in each locations. Altogether there were 779 individuals belonging to 26 families and 130 species that were collected. Species richness was found in the habitats that are located 1500 to 2600 m from the forest.Based on Shannon's index, the highest diversity was found to be on landscape with the distance of 1000 to 1500 m from the forest (B01) in sub-district Tamansari. Spesies similarity was found to be quite with less than 50% between different habitats. However, species composition between different habitats does not show is any difference. Result of the study does not show that diversity of Hymenoptera is effected by distance from forest instead it is more influenced by conditions and type of agricultural landscapes.
Keyword: 

Judul: Keanekaragaman Serangga Penyerbuk pada Pertanaman  Mentimun Pengaruh Keberadaan Habitat Alami
Abstrak: Pollination is a critical first step in sexual reproduction of flowering plants. Insect pollinator plays an important role in pollination prosess of flowering plants, including cucumber. The aims of this study are to determine the influence of natural habitats toward the diversity insect pollinators and to gain informations of the relationship between insect pollinator diversity and the number of flowers. The research was set up in six locations with different distances from the natural habitat. Three locations are categorized as being in a close proximity to natural habitat (D), which is about ≤200 m and three other locations are categorized as far from natural habitats (J), with a distance of ≥1000 m.The distance between the locations are 1.5 km. Observations were conducted by two methods, sweeping net and malaise traps. Number of flowers were counted using the amount of flower activities which open and close at four points for each by 1 m x 1 m plot. Results showed that agricultural land conditions affect the abundance of insect pollinators. The highest diversity of insects were found in the morning, e.g.- at 09:00 am and 11:00 am. No correlation were found between the numbers of species of insect pollinators and the numbers of flower.
Keyword: pollination., natural habitat, insect pollinator, diversity

Judul: Transformasi fasa pada pembuatan keramik alpha-alumina dengan proses sol-gel
Abstrak: Proses sol-gel merupakan proses terbaru yang dikcmbangkan untuk membuat keramik, termasuk alumina (Al2O3). Proses ini dapat mengontrol struktur mikro dan sifat keramik dengan jalan mengontrol parameter proses pcmbuatan, suhu pemanasan yang dibcrikan rclatif rendah, kcmurnian produk yang dihasilkan relatif tinggi, plastisitas gel dapat mcmbcrikan produk dalam bcntuk scrbuk, serat, lapisan tipis dan bentuk padat Hal yang menarik untuk diamati pada proses pembuatan kcramik alumina dengan proses sol-gel adalah te1jadinya transformasi fasa. Menurut bebcrapa pcnclili, fasa-fasa yang tc1jadi adalah alumina hidrat (dapat berupa diaspore atau boehmile), gamma-, delta-, theta-dan alpha-alumina. Masing-masing fasa tcrsebul mempw1yai sifat fisis yang berbcda. Satu mol serbuk aluminum /rifer/ butoxidc [(C21-15Cl-l(CI-13)O),Al] dicampur dengan 100 11101 air (H20). Campuran tersebut diaduk dengan magnetic stirer sampai homogcn. Setelah homogcn, pada suhu 90°C campuran tcrsebut dipeptisasi dengan katalis asam, 0,2 mol 1-JCI. Proses polimerisasi ini membentuk gel. Gel yang diperoleh dikeringkan pada suhu 90°C, kcmudian dibagi-bagi untuk dipanaskan pada beberapa suhu, yaitu 300°C, 400°C, 500°C, 600°C, 700°C, 800°C, 900°C, l000°C, 1100°C, 1200°C dan 1300°C, selama satu jam dalam ruang pemanas (furnace). Setelah itu, sampel segera dikeluarkan dari ruang pemanas dan didinginkan di udara. Evolusi termal diamati dengan analisis termal dari suhu kamar sampai suhu 1300°C, yaitu dijferential thermal analysis (DTA) dan lhermogravimetric analysis (TGA). Fasa-fasa yang te1jadi pada sctiap sampel ditentukan dcngan X-ray d/fji-actomelly (XRD). Idcntifikasi fasa dilakukan dengan menggunakan meta de Hanawalt secara manual dan analisis kuantitatif clilakukan pada pola difraksi sampel 1000°C, puncak 012 (fasa alpha) dan 004 (fasa theta) dengan menggunakan metode pcrbandingan langsung. Morfologi pennukaan sampel diamati dengan mikroskop optik (MO) dan scanning electron microscope (SEM). Sedangkan kerapatan sampel diukur dengan piknometcr. Dari basil penelitian diperoleh bahwa fasa-fasa yang terbentuk adalah fasa boehmite (antara suhu 90°C-300°C), fasa gamma-(antara suhu 400°C-800°C), fasa delta-(sekitar suhu 900°C), fasa theta­(sekitar suhu l000°C) dan fasa alpha-alumina (antara l 100°C-1300°C). Masing-masing fasa tersebut mempunyai sistem kristal, morfologi permukaan clan kerapatan yang bcrbcda. Pad a suhu 1000°C, secara kuantitatif, terbentuk fasa theta sebesar 50,18% dan alpha 49,82%. Transformasi tennal dari gamma-kc delta-, de/la-ke theta-tidak tcrdeteksi, baik dcngan DTA maupun TOA. Morfologi pcrmukaan gel alumina yang telah dipanaskan pada suhu 1300°C mcnunjukkan fonnasi kristalin. Kcrapatan fasa alpha­alumina adalah (400 ± 3) IO kg m-3•
Keyword: