Judul: Analisis faktor sosial ekonomi terhadap nilai mutu rata mahasiswa TPB IPB tahun 1993-1995
Abstrak: Informasi mengenai mahasiswa TPB berupa lembaran isian, berisikan faktor-faktor sosial ekonomi mahasiswa TPB selama di SLTA. Kelulusan mahasiswa TPB diduga berkaitan erat dengan faktor sosial ekonomi disebabkan mahasiswa TPB masih membawa sifat dan karakter sewaktu di SLTA. Metode Regresi Logistik Berganda digunakan untuk mencirikan kelompok status kelulusan mahasiswa TPB, dari status Keluar hingga status Cum Laude, berdasarkan faktor sosial ekonominya. Mahasiswa yang diteliti adalah Angkatan 1993-1994, 1994/1995, dan gabungan keduanya. Dari hasil analisis diperoleh peubah faktor sosial ekonomi yang mempengaruhi status kelulusan. Dan dari faktor sosial ekonomi tersebut didapatkan peubah faktor sosial ekonomi yang mencirikan masing-masing status kelulusan. Untuk ketiga angkatan, peubah yang menjadi penciri bagi kelulusan rendah adalah lokasi SLTA di luar pulau Jawa, di kota kecil seperti desa dan kecamatan, dan minat olahraga. Sedangkan yang mencirikan status kelulusan tinggi adalah lokasi SLTA di pulau Jawa dan di kota besar seperti kotamadya. Status SLTA swasta cenderung meningkatkan status kelulusan.
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Judul: Evaluasi Faktor Sosial dan Ekonomi terhadap IPK<2.10 di TPB IPB
Abstrak: IPB admit students through the SNMPTN Undangan, written test (SNMPTN Ujian Tertulis and Ujian Talenta Masuk IPB), Beasiswa Utusan Daerah, and Prestasi Internasional-Nasional. The majority of admissions is from SNMPTN Invitation, which is about 67%. Selection method on the SNMPTN Undangan based on school quality that is reflected in PERAK SLTA-IPB, academic potential applicants, and principle of student diversity IPB as a miniature of Indonesia. Academic potential applicants are represented by the value of science and math, and students in the school rankings. The distribution of grade point average (GPA) TPB is negative skew. Total of 9.1% of students in TPB IPB academic year 2011/2012 have GPA<2.10 with unequal percentages in each selection and 16% of them is drop out. PTN is essentially trying to get students with the best academic potential as much available capacity, certainly it is not a random process. Relationship between GPA and social and economic factors with quantile regression shows that SNMPTN Undangan, female student, study program BPIF category 1, and area from Central Java - Yogyakarta - East Java provides a low failure rate in the TPB. Electric power and income of parents has not effect on the low GPA. In addition, the UN does not affect the value of a low GPA then the UN has not been able to reflect the value of school quality and academic potential high school graduates to succeed in the TPB.
Keyword: Quantile Regression, PERAK SLTA-IPB, GPA

Judul: Sintesis Nanokristal Magnetit Menggunakan Urea sebagai Penjerap Cr(VI)
Abstrak: The study was to synthesize and characterize magnetite nanocrystal. Magnetite powder was synthesized using hydrothermal method from FeSO4 as precursor and sodium hydroxide and urea as the base sources. Characterization of the obtained powder was carried out using X-ray diffraction, scanning electron microscope, and energy dispersive X-ray analyzer. The crystallite size of magnetite by X-ray diffraction was obtained from 18,23 to 67,34 nm. The scanning electron microscope observations showed that magnetite particles underwent agglomeration. Magnetite powder was used as Cr(VI) adsorbent. The results showed that adsorption capacity for urea-based magnetite at pH 1-5 in 2 hours were 1.92; 1.91; 1.59; 1.20; and 1.21 mg/g, respectively. Adsorption capacity for sodium hydroxide-based magnetite (pH 1-5, 2 hours) were 1.74; 1.83; 0.64; 0.69; and 0.77 mg/g. The results indicated that urea-based magnetite is able to increase adsorption capacity.
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