Judul: Analisis bronkitis kronis dengan menggunakan model logit
Abstrak: Persamaan regresi adalah persamaan matematika yang memungkinakan untuk menduga nilai suatu peubah takbebas dari satu atau lebih pebah bebas. Model regresi banyak diterapkan dalam masalah pendugaan di berbagai bidang. Model regresi logit dalam kasus Dichotomous adalah model regresi logit dan data-data yang ada, peluang suatu kejadian dapat diduga.
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Judul: Analisis diagnosa regresi : suatu kajian metode dalam analisis regresi berganda
Abstrak: Penerapan analisis regresi biasanya digunakan untuk melihat bentuk hubungan antara peubah bebas dengan peubah respons pada suatu matriks data. Analisis regresi akan menjadi alat yang andal untuk menarik suatu kesimpulan jika asunsi-asumsi yang diperlukan dalam analisis data terpenuhi. Penelitian ini bertujuan untuk melihat penerapan Analisis Diagnosa Regresi pada model regresi linier berganda. Penggunaan analisis diagnosa regresi dipusatkan kepada pemeriksaan validitas model, pengujian pencilan dan peneriksaan pengamatan yang berpengaruh. Data yang digunakan untuk penelitian ini merupakan data pengamatan erosi didaerah Gunung Kidul yang didapatkan dari Pusat Penelitian Tanah. Diagram pencar (scatter diagram) nilai Y dugaan terhadap nilai sisaan baku menunjukkan bahwa matriks data asal memiliki ragan yang tidak konsisten. Upaya penstabilan pons. ragan dilakukan dengan mentransformasi peubah res-Transformasi yang digunakan adalah Akar Dua. ...
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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