Judul: Analisis pemilihan dan penyebaran perontok kedelai mekanis pada tingkat kelompok tani di kabupaten Langkat, Sumatera Utara
Abstrak: Di Indonesia, kedelai merupakan bahan pangan yang penting sebagai surnber protein nabati sehingga sebagian besar kedelai dikonsumsi dalam bentuk makanan olahan. Indonesia masih mengimpor kedelai dan bungkil kedelai untuk memenuhi kebutuhan dalam negeri. Peningkatan dan perbaikan penanganan pasca panen kedelai merupakan salah satu usaha untuk rneningkatkan produksi kedelai dalam negeri. Dalam penanganan pasca panen kedelai di Indonesia, susut tercecer akibat perontokan manual relatip lebih besar dibandingkan dengan susut tercecer akibat kegiatan penanganan pasca panen lain.
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Judul: Analisis pemilihan dan penentuan jumlah kebutuhan perontok kedelai mekanis pada tingkat wilayah kerja penyuluhan pertanian (WKPPP di kabupaten Ngawi, Propinsi Jawa Timur)
Abstrak: Susut pada perontokan kedelai dengan cara tradisional dapat mencapai 7 % sehingga merupakan kerugian yang cukup besar bagi petani. .Perontok kedelai mekanis ternyata mampu menurunkan susut kedelai sampai 0.5 %. Akan tetapi, upaya sosialisasi teknologi perontokan mekanis banyak berhadapan dengan faktor-faktor kendala di dalam masyarakat petani baik kendala ekonomi, teknologi, sosial, dan kondisi disain alat. Kendala tersebut juga dihadapkan dengan ketersediaan beberapa alternatif perontok mekanis yang ada di pasaran. Pemilihan perontok mekanis yang tepat untuk suatu wilayah perlu dipelajari untuk selanjutnya dihitung jumlah kebutuhannya.
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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