Judul: Tipologi ekosistem mangrove dan hubungannya dengan keberadaan kepiting (Brachyura) di KPH Mantingan desa Banggi kabupaten Rembang, Jawa Tengah
Abstrak: Ekosistem mangrove di KPH (Kesatuan Pemangkuan Hutan) Mantingan Banggi merupakan ekosistem mangrove yang ditanam secara swadaya oleh masyarakat. Ekosistemmangrove ini mempunyai banyak manfaat yang bisa dimanfaatkan oleh masyarakat setempat, namun pada kenyataanya belum termanfaatkan secara maksimal.
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Judul: Composition of tree species and standing structure of mangrove forest in the pasar banggi village rembang central java province
Abstrak: Ekosistem mangrove Desa Pasar Banggi merupakan salah satu yang cukup baik di Pantura Jawa Tengah. Jenis pohon yang dapat ditemui di hutan mangrove ini yaitu Rhizophora mucronata, Rhizophora apiculata, Sonneratia alba, danAvicennia marina. Pada tingkat semai didominasi oleh Rhizophora mucronata dengan nilai INP 175.99 begitu pula dengan tingkat pancang dan pohon juga didominasi oleh jenis Rhizophora mucronata dengan nilai INP masing-masing 208.2 dan 183.19. Indeks keragaman (H’) pada hutan mangrove ini tergolong rendah, tingkat semai memiliki indeks keragaman dengan nilai hanya 0.95 tidak jauh berbeda dengan tingkat pancang dan pohon yang masing-masing 0.84 dan 0.75. Tingkat kerawanan degradasi dari parameter kerapatan vegetasi masuk ke dalam tingkat rendah, sedangkan dari parameter indeks keragaman tergolong tingkat tinggi yang menunjukan rawan degradasi. Struktur tegakan secara umum berbentuk huruf “J” terbalik kecuali jenis Sonneratia alba, hal ini kemungkinan disebabkan kegagalan regenerasi oleh jenis Sonneratia alba., Mangrove ecosystem at the Pasar Banggi village is one of the mangrove ecosystem which is quite good in the northern coastal of Central Java. The tree spesies that can be found in this mangrove forest is Rhizophora mucronata, Rhizophora apiculata, Sonneratia alba and Avicennia marina. For seedlings dominated by the Rhizophora mucronata with score of Important Value Indeks 175.99 similarly with saplings and trees are also dominated by Rhizophora mucronata types with Important Value Indeks 208.2 and 183.19. Index of biodiversity in mangrove forests is relatively low, seedlings have a diversity index with a value of only 0.94 is not much different from the saplings and trees which are also only 0.84 and 0.75. The vulnerability of the degradation for density parameters into the low class while the parameters of the biodiversity index into high classified which showed cartilage degradation. Stand structure in general shape of reverse "J" exception types Sonneratia alba, this condition maybe caused by unsuccsed regeneration for Sonneratia alba.
Keyword: ekosistem mangrove, komposisi jenis, struktur tegakan

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