Judul: The Effect of Canopy on Growth of Dryobalanops lanceolata Burck. in The Age at KHDTK Haurbentes, Jasinga
Abstrak: Jenis-jenis Dipterocarpaceae menjadi andalan dalam produk-produk hasil hutan berupa kayu pertukangan. Upaya melestarikan jenis-jenis Dipterocarpaceae, maka Badan Penelitian dan Pengembangan telah membangun Hutan Tanaman koleksi Dipterocarpaceae seluas 60 ha di Kawasan Hutan Dengan Tujuan Khusus (KHDTK) Haurbentes, Kabupaten Bogor, Provinsi Jawa Barat. Penelitian ini bertujuan untuk mengetahui persentase tutupan tajuk yang optimal dan karakteristik lingkungan yang tepat untuk pertumbuhan D. lanceolata. Data primer didapat dengan melakukan pengukuran dan pengamatan terhadap pertumbuhan D. lanceolata berupa diameter setinggi dada, tinggi pohon, tingkat tutupan tajuk dan kondisi lingkungan (temperatur dan kelembaban). Data sekunder berupa data pertumbuhan awal saat D. lanceolata baru ditanam dan kondisi umum lokasi penelitian. Pertumbuhan diameter dan tinggi D. lanceolata dipengaruhi oleh tutupan tajuk namun memiliki korelasi yang rendah. D. lanceolata dapat tumbuh pada rentang persentase tutupan tajuk sebesar 40% - 65% dan akan tumbuh dengan optimal apabila persentase tutupan tajuk dibawah 65%., Dipterocarp species are the mainstay of forest products in the form of carpentry wood. In an effort to preserve the Dipterocarpaceae species, the Research and Development Agency had established a 60 ha collection of Dipterocarp Forest Plantation in forest area with special purpose (KHDTK) Haurbentes, Bogor Regency, West Java Province. This study aims to determine the percentage of optimal canopy cover and appropriate environmental characteristics for the growth of D. lanceolata. Furthermore, primary data were obtained by measuring and observing the growth of D. lanceolata in the form of diameter at breast height, tree height, canopy cover level and environmental conditions (temperature and humidity). Meanwhile, secondary data, which was in the form of initial growth data when D. lanceolata, was newly planted and the general condition of the study site. The growth of diameter and height of D. lanceolata was influenced by canopy cover but had a low correlation. In addition, D. lanceolata can grow in the canopy cover percentage range of 40% - 65% and it will grow optimally if the percentage of canopy cover is below 65%.
Keyword: canopy, diameter, Dryobalanops lanceolata, height, growth

Judul: Pertumbuhan Anakan Kapur Tanduk (Dryobalanops lanceolata Burck.) pada Berbagai Tingkat Penutupan Kanopi di KHDTK Haurbentes, Jasinga
Abstrak: Deforestasi hutan telah berdampak pada produktivitas hutan terutama pada kelompok jenis komersial, seperti jenis Dipterocarpaceae sehingga perlu dilakukan upaya rehabilitasi untuk keberlanjutan produksi. Jenis Dryobalanops lanceolata Burck. merupakan salah satu jenis dari famili Dipterocarpaceae yang pertumbuhannya termasuk cepat yang dapat dijadikan pilihan jenis untuk rehabilitasi. Penelitian ini bertujuan menganalisis persentase penutupan kanopi yang baik untuk pertumbuhan anakan D.lanceolata. Penelitian ini menggunakan hubungan regresi antara diameter dan tinggi tanaman dengan persentase penutupan kanopinya. Persamaan dengan fungsi rasio merupakan model yang dapat menjelaskan hubungan paling baik antara pertumbuhan anakan D.lanceolata dengan penutupan kanopinya. Adanya penutupan kanopi sebesar 31% - 37 % mampu memberikan pertumbuhan tinggi antara 70.6-75.5 cm untuk anakan D.lanceolata dan penutupan kanopi sebesar 29% - 31% mampu memberikan pertumbuhan diameter antara 11.6-11.7 mm.
Keyword: deforestasi, Dryobalanops lanceoalata, penutupan kanopi, pertumbuhan, rehabilitasi

Judul: The Isolation of Silver (Ag) from Fixer Sludge with Electrolysis methode
Abstrak: with the variations concentration, electrode of carbon, and voltages. The aim of research are looking for the easiest and eficient electrolysis. Among of 272.79 ppm of silver (impurities) could be produced from electrolysis fixer which used 300 times maintain the film. For 400, 500, and 600 times electrolysis were produced recently 49.42, 137.04, and 55.22 ppm. Futhermore, it was increased to 220.00 ppm from 700 times. These were possible because of density the solutions. From the electrode of carbon, 68.2222 g Ag (impurities) could be processed from size 14 cm x 3 cm x 3 cm. The next results 41.2050 g and 43.7559 g from the sizes 16 cm x 3 cm x 3 cm and 18 cm x 3 cm x 3 cm. The reasoned of this part any faster reaction on the most litle electrode. By the way, from voltages variation, the processed showed that 47.4575 g of Ag (impurities) could be produced from 11 volt. It’s caused the bigest voltages are also the bigest kinetics power on the reactions. Sampel and product were analized by AAS. Consentration has potential to be indicator, because of the used 700 times was given trend high Ag (impurities) became increase optimally at 11 volt, and much sediment that is 47.4575 g. The best rendemen is 13.33%. The other finding is that the strength of the time and the voltages strongly enfluence the electrolysis shown by the bigger result on F(calculation) than that of the F(table).
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