Judul: Model Regresi Binomial Negatif Terboboti Geografis untuk Data Kematian Bayi (Studi Kasus 38 Kabupaten/Kota di Jawa Timur)
Abstrak: Negative binomial regression model is used to overcome the overdispersion in Poisson regression model. This model can be used to model the relationship of the infant mortality and the factors incidence. Geographical conditions, socio cultural and economic differ one of location another location causes the factors that influence infant mortality is different locally. Geographically Weighted Negative Binomial Regression (GWNBR) is one of methods for modeling that count data have spatial heterogeneity and overdispersion. The basic idea of this model considers of geography or location as the weight in parameter estimation. The parameter estimator is obtained from Iteratively Newton Raphson method. This research will determine the factors that influence infant mortality. GWNBR model with a weighting adaptive bi-square kernel function classifies regency/city in East Java into 16 groups based on the factors that significantly influence the number of infant mortality. This model is better used to analyze the number of infant mortality in East Java in 2008 due to a smallest deviance value.
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Judul: Study of Overdispersion Poisson Regression with Negative Binomial Regression then That Application on Amount of Infant Deaths in Indonesian at 2012.
Abstrak: Model regresi Poisson adalah model standar yang digunakan untuk memodelkan respons data cacahan. Pada penelitian ini model regresi Poisson digunakan untuk membangun model antara jumlah kematian bayi di Indonesia sebagai peubah respons (Y) dan beberapa faktor yang mempengaruhi jumlah kematian bayi sebagai peubah bebas (X). Salah satu asumsi yang harus dipenuhi dalam model regresi ini adalah asumsi equidispersi. Namun dalam penerapannya seringkali asumsi equidispersi tidak terpenuhi. Apabila nilai harapan peubah respons tersebut tidak sama dengan nilai ragam dari peubah respons tersebut, maka kejadian ini disebut Overdispersi. Overdispersi menyebabkan keterandalan dari hasil analisis regresi Poisson menjadi bias. Alternatifnya Regresi Binomial Negatif digunakan untuk mengatasi data yang mengandung overdispersi. Pada penelitian ini dilakukan simulasi dengan membangkitkan peubah respons (Y) dan 2 peubah penjelas (X1 dan X2). Hasil simulasi pada penelitian ini menunjukkan bahwa model regresi Binomial Negatif lebih baik digunakan daripada model regresi Poisson pada data yang mengalami fenomena overdispersi, terlihat dari nilai AIC yang lebih kecil. Pada model aplikasi data rill terindikasi adanya overdispersi, oleh karena itu fenomena overdispersi pada data kematian bayi ditangani dengan model regresi Binomial Negatif. Hasil analisis menunjukkan bahwa faktor-faktor yang mempengaruhi jumlah kematian bayi antara lain: persentase kemiskinan, rasio jumlah bidan terhadap seratus penduduk dan rata-rata umur ibu pada saat pertama kali melahirkan.
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, AIC, Negative Binomial Regression, Overdispersion, Poisson regression, Angka kematian bayi, Model regresi binomial negatif, Metode simulasi, Kajian simulasi

Judul: Application of phycocyanin from microalgae Spirulina platensis as light harvesting in anatase TiO2 nanoparticle solar cell.
Abstrak: The dye sensitized solar cell (DSSC) has been assemblied used hybrid titanium oxide (TiO2) film/phycocyanin. The TiO2 film was synthesized by sol gel method with titanium chlorida (TiCl4) as precursor by hydrolysis used sulfuric acid (H2SO4). Furthermore, it calcinated for 2,5 hours in variation of annealing temperature (400oC, 600oC, 800oC, dan 1000oC). In XRD patterns exhibited which annealing temperature at 400oC to 800oC were anatase phase all. When annealed at temperature 1000oC, it caused phase transformation from anatase to rutile. The crystals size according to XRD patterns were 13,75 nm, 20,79 nm, 25,25 nm, 48,88 nm and particle size from SEM images were 43,06 nm, 44,91 nm dan 64,99 nm, 80,40 nm, respectively. The crystals and particle size increased with annealing temperature. The film thickness influenced material absorption. The optical measurement of TiO2 film and TiO2/phycocyanin hybrid film used UV-Vis spectrophotometer. Additional phycocyanin caused peak width of absorbed region from ultraviolet to visible region. The band gap energy of TiO2 can be calculated using the cut off wavelength obtained from the absorbance spectrum of a nanoparticles TiO2 films. Based on intersection between linear and energy (hv) axis. In this study just limited for anatase phase. It was caused anatase band gap is wider than rutile phase. That’s meaningful for solar cell application such as dye sensitized solar cell (DSSC). The absorption coefficient average at difference annealing temperature such as at 400oC, 600oC, 800oC were 8,1600x102, 1,7535x103 and 4,0154x102, where α < 104 include to direct transition. Band gap energy 400oC, 600oC, 800oC were 3,79 eV, 3,59 eV, and 3,35 eV, respectively. Based on this result, exhibition that band gap energy of TiO2 semiconductor film decreased with increasing annealing temperature. Spirulina platensis was cultivated in technical modification (Hastuti) with aeration under light intensity about 3000 lux. The cell density (stationer phase) for eighth day which OD value was more than 0,5. It means, the culture can be harvested. In 80 liters Spirulina platensis culture have been produced biomass dry about 10,46 gram and extracted phycocyanin in dry powders was 5,50 gram. The phycocyanin absorption spectrum at the wavelength of 619,36 nm (visible region) which had relaxation energy was 2,945 eV. The emission peak at the wavelength of 708,55 nm with relaxation energy about 2,793 eV. The Stokes shift based on difference energy absorption and emission calculated about 0,152 eV. Both of this showed phycocyanin can absorbed and radiated the sun light which received. This choice characteristic pigment was a good one related to sensitizer in solar cell application. Integration between light harvesting protein and TiO2 semiconductor surface had important role in improving of output as solar cell materials. The presence of carboxylate group (-COOH) made pigment be more efficient was due to anchored to the surface of TiO2 ampoter. The phycocyanin pigment had carboxylate group which reacted with TiO2 surface formed ester. The carboxylate group increased of dye electronics couple from excited state (p anti bonding orbital) to semiconductor acceptor state (TiO2 conduction band). The samples which made based on annealing temperature variation formed be solar cell respectively. Furthermore, cells be assembled for
Keyword: anatase, dye sensitized solar cell, efficiency, gap energy, phycocyanin