Judul: Jaringan Komunikasi Dan Kohesivitas : Kajian Iklim Kelompok  Dan Aplikasi Pengendalian Organisme Pengganggu Tanaman  (OPT) Ramah Lingkungan Di Desa Purwasari Bogor, Jawa Barat
Abstrak: Kelompok seringkali memegang kunci penting dalam rangka fasilitasi anggota kelompok untuk berperilaku tettentu seperti aktivitas pengendalian organisme pengganggu tanaman dalam budidaya padi sawah. Penelitian ini berusaha untuk mengidentifikasi jaringan komuuikasi dau kohesivitas, mengidentifikasi iklim kelompok yang terbentuk, menjelaskan aplikasi pengendalian Organisme Pengganggu Tanaman (OPT) ramah lingkungan pada budidaya sawah oleh kelompok, meiiganalisis hubungan antara jasingan komunikasi dan kohesivitas dengan iklim kelompok, serta menganalisis hubungan antara iklim kelompok dengan aplikasi pengendalian Organisme Pengganggu Tanaman (OPT) ramah lingkungan pada budidaya sawah yang dilakukan oleh anggota Kelompok Tani Mekar Sari.
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Judul: Gaya Komunikasi Pemimpin dan Keefektifan Kelompok Tani dalam Melaksanakan Program Konservasi Tanah dan Air Kasus Di DAS Ciliwung Hulu, Kecamatan Cisarua, Bogor
Abstrak: Generally, soil and water conservation program in Indonesia generally and in Upper Ciliwung Watershed especially, put a farmers group as executor in the fields. Considering this situation, the key success factor for soil and water conservation measures is how far effectiveness of farmers group in executing these activities. The objective of this research are: (1) to identify farmers group effectiveness in executing soil and water conservation activities; (2) to analyze a relationship between communications style of farmers group leader and farmer group’s effectiveness in executing soil and water conservation measure; (3) to analyze a relationship between communication style of farmers group leader and a maturity and characteristics of farmers group members. This research was designed as descriptive co relational. Primer data was collected through interviewed to four farmers group members in four villages in Cisarua Sub District in Bogor Regency with 161 respondents. The collected data were analyzed by Correlation Spearman Test. The main results of this research show: (1) the farmer groups in Upper Ciliwung have a good effectiveness; (2) communication style of the farmers groups leader are tend to linier; and (3) farmer groups members are paternalistic performance. Convergence communication style conducive for achieving farmer groups’ effectiveness. Convergence communication style of farmer group’s leader tend to be applied in the maturity of farmer groups members. This communication style able to promote farmer groups participation in conservation activities. The farmer group leaders tend to apply convergence communication style when: (1) member of farmer groups have a good income; (2) member of farmer groups use convergence communication; and (3) member of farmer groups have several jobs, which need certain skill.
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Judul: Separation of Neodymium from U3Si2/Al Fuel Plate for Burn-Up Determination
Abstrak: Neodymium is a common fission product produced in nuclear fission reactions. Neodymium in this study was chosen as a burn-up indicator for U3Si2/Al fuel element plates because the neodymium isotope is a stable fission product with a fairly high yield. Some procedures were carried out to separate neodymium, starting with the separation of cesium isotopes (137Cs, 134Cs) through the precipitation method, then separation of uranium isotopes (235U, 238U) and plutonium isotopes (239Pu, 238Pu) with Dowex 1x8 ion exchange resin, and separation of neodymium (Nd), samarium (Sm), as well as cerium (Ce) with Dowex 1x4 ion exchange resin. The Cs recovery reached 99.95%. The U and Pu isotopes resulting from the separation are subjected to an electrodeposition process and the weight of each isotope can be measured with an alpha spectrometer. The separation results of Nd from Sm and Ce have been proven using an XRF spectrometer. The neodymium isotopes separation was corrected using the standard addition method, and an average total Nd content of 2.4 ppm was obtained in the PEB U3Si2/Al bottom solution. It is hoped that this separation method can be applied in determining burn-up of nuclear fuel.
Keyword: neodymium, burn-up indicator, U3Si2/Al fuel plate