Judul: Model regresi logistik biner untuk menganalisis tingkat intensitas pembelian majalah Tempo
Abstrak: Secara umum masalah yang sering dihadapi oleh para peneliti adalah bagaimana mengkaji hubungan dua jenis peubah yaitu peubah respon dan peubah penjelas. Salah satu cara untuk menganalisis masalah tersebut adalah analisis regresi logistik. Sebelum dibentuk model regresi logistik dilakukan tahapan eksplorasi data yaitu penggabungan kategori dengan menggunakan metode chimerge dan kemudian dibentuk dua model regresi logistik biner yaitu model 1 (model regresi logistik dari peubah-peubah penjelas dengan kategori awal) dan model 2 (model regresi logistik dari peubah-peubah penjelas dengan kategori baru). Pada penelitian ini, penerapan kedua metode tersebut dilakukan pada kasus penganalisisan tingkat intensitas pembelian Majalah Tempo.
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Judul: Model Regresi Logistik Untuk Analisis Data Biner
Abstrak: Metode regresi merupakan salah satu metode yang sering digunakan di dalam analisis data pengamatan, Dengan tujuan untuk melihat paJa hubungan antara suatu peubah respolls dengan satu at3u lebih peubah penjelas. Data yang digunakan pada model regresi dapat berupa data kontinu atau data diskret. Bila peubah respolls berskala kontinu dan menyebar normal maka disebut dengan model regresi normal atau klasik. Sedangkan bila peubah respons berskala biner model regresinya disebut model regresi logistik.
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Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell