Judul: Judul Polimer Konduktif Komposit Polivinil Alkohol-TiO2 sebagai Perangkat Sel Surya
Abstrak: Sel surya tersensitisasi pewarna (DSSC) adalah jenis sel surya yang mengonversi energi matahari menjadi energi listrik. DSSC tersusun dari elektrode kerja, elektrode pembanding, larutan elektrolit, dan pewarna. Penelitian ini mempelajari pengaruh tambahan variasi polivinil alkohol (PVA) yang dikompositkan dengan titanium dioksida (TiO2) dengan menambahkan acid blue 80 dalam sistem DSSC. Pencirian acid blue 80 menggunakan spektrofotometer ultraviolet-tampak menunjukkan serapan pada pada panjang gelombang 581.6 dan 625.6 nm. Spektrum inframerah transformasi Fourier dari komposit PVA-TiO2 menunjukkan serapan gugus Ti-O-O pada 607.58 cm-1 dan -OH dari PVA pada 3423.65 cm-1. Komposit PVA-TiO2 dibuat dengan 3 komposisi, yaitu 2:1, 3:1 dan 4:1. Komposit PVA-TiO2 (3:1) berhasil diaplikasikan sebagai perangkat sel surya dengan efisiensi optimum 0.08 %.
Keyword: DSSC, dye acid blue 80, conductive polymer, PVA

Judul: Sel Surya Titanium Dioksida Tersensitasi Polyphenylene Vinylene dengan Elektrolit Polimer
Abstrak: Sel surya tersensitasi dye dibuat dengan konfigurasi TiO2/PPV/iodolyte, Polyphenylene Vinylene (PPV) berfungsi sebagai dye penyerap cahaya. TiO2 yang dibuat memiliki fase dominan anatase dengan ukuran 37,344nm. PPV yang dilarutkan dalam kloroform memiliki rentang penyerapan cahaya dari 330 nm hingga 600 nm dengan puncak absorbsi di sekitar 550 nm. PPV meningkatkan kemampuan penyerapan cahaya tampak pada TiO2 dengan cara menyusup ke dalam pori TiO2. Elektrolit yang digunakan berupa polimer dengan maksud memberikan ketahanan sel surya yang lebih baik terhadap lingkungan. Dua sampel dibuat dengan perbedaan konsentrasi PPV terhadap pelarut masing-masing 0,25 % (sampel A) dan 0,5 % (Sampel B). Dari kedua sampel tersebut didapatkan efisiensi sebesar 0,0514 % untuk sampel A dan 0,0209 % untuk sampel B.
Keyword: 

Judul: Studies on growth spurt and aging in higher primates
Abstrak: single measurement that best defines the health and nutritional status of children, just as it provides an indirect measurement of the quality of life of an entire population. The pattern of human growth reflects the biocultural evolution of our species. The human pattern of growth and development (ontogeny) appears to differ markedly from patterns of ontogeny in other primate species. Three studies are reported here which deal to the growth and development of human and chimpanzee (Pan troglodytes). These three studies allow us to contrast the phenomena of adolescence growth spurt and female elderly bone loss in chimpanzee and human as chimpanzee is the closest species to humans within extant nonhuman primates. In the first, a cross-sectional study of growth of the body size and somatotype of 363 Javanese girls and 299 Javanese boys aged 4 to 20 years from Magelang Regency, Indonesia was described. In the second, cross-sectional and longitudinal studies in the growth of chimpanzee second metacarpal bone linear dimensions from individuals aged 0 to 43.6 years were used for comparison. While in the third, cross-sectional and longitudinal studies in the growth of chimpanzee body size (body mass and anterior trunk length) and second metacarpal bone mineral content were derived. In measuring the second metacarpal dimensions and mineral content, a total of 568 radiographs of chimpanzee's proximodistal left hands were used. They were taken from 68 females and 49 males aged 0 to 43.62 years old. We applied an image analysis system, Scion Image Release Alpha 4.0.3.2 software for Windows to measure bone linear dimensions and bone mineral content. Humans present complex and sinuous growth curves for both body weight and height. A clear growth spurt could be demonstrated by cross-sectional analysis in our girl subjects at around aged 11.5 years and in our boy subjects at around aged 12.5 years. In longitudinal series, not in cross-sectional, several representative chimpanzees of both sexes showed a pre-adult growth spurt on the body sizes, bone dimensions and bone mineral content. They ranged at age 4.5 to 8.5 years. This underscore the fact that adolescent growth spurt in linear dimension was not a universal feature of anthropoid primate ontogeny. Bone loss is a well established characteristic of human female aging. Based on crosssectional analyses the sequential decline of bone mass in female chimpanzee may be said to be genuine. On the other hand, we found in adulthood through elderly, male chimpanzees show a longer plateau than female chimpanzee, that is, bone mineral content is maintained in male.
Keyword: Javanese children, growth spurt, chimpanzee, second metacarpal bone, bone loss, Higher Primates