Judul: Pengaruh kualitas air sungai gajah wong terhadap kesehatan satwa di kebun binatang gembira loka dan masyarakat sekitarnya
Abstrak: Kebun Binatang Gembira Loka memiliki peran yang besar bagi masyarakat Yogyakarta, yaitu sebagai sarana konservasi, pendidikan, penelitian, dan rekreasi. Dalam perkem bangannya, peranan Kebun Binatang Gembira Loka tersebut semakin besar, seiring dengan peningkatan kebutuhan masyarakat pada keberadaan Kebun Binatang tersebut. Karena peranannya semakin besar, maka pengelolaan Kebun Binatang Gembira Loka sangat menentukan kelangsungan fungsi atau peranan Kebun Binatang tersebut. Pengelolaan Kebun Binatang tersebut tidak lepas dari interaksi dengan sumberdaya dan lingkungan sekitarnya. Salah satu sumberdaya yang tidak dapat dipisahkan dengan pengelolaan Kebun Binatang Gembira Loka adalah keberadaan Sungai Gajah Wong. Air Sungai Gajah Wong dimanfaatkan sebagai sumber air minum bagi sebagian besar satwa di Kebun Binatang. Sebaliknya, limbah cair Kebun Binatang juga disalurkan ke perairan Sungai Gajah Wong. ...
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Judul: Manajemen Limbah Cair Buangan Kebun Binatang Gembira Loka dan Dampaknya terhadap Kualitas Air Sungai Gajahwong
Abstrak: Gembira Loka zoo produce liquid waste into Gajahwong river wasted and cause the possibility of lowering the water quality in Gajahwong river. The research was carried out in 3 point located in Gajahwong river and 1 point liquid waste disposal point Gembira Loka zoo in May-June of 2013. Analysis liquid waste based on the Governor of DIY number 7 of 2010, while water quality of the Gajahwong river uses water quality index (IKA) with 9 test parameters, BOD, DO, TDS, temperature, pH, nitrates, phosphates, fecal coliform and turbidity. Water quality include the categories medium, and there are a few parameters that exceeded the Agency's water quality standard class 2. Water quality degradation was allegedly derived from various sources pollutant. Contribution Gembira Loka zoo doesn't give significant effects in the water quality of river because of the experience dissolving organic in river, as well as supported by the results of the test liquid waste under the raw quality.
Keyword: water quality., water quality index, pollutant, liquid waste

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