Judul: Nematoda Parasit Padi Sawah Di Desa Karyasari, Kecamatan Rengas Dengklok, Kabupaten Karawang,Jawa Barat
Abstrak: Padi merupakan bahan pangan utama masyarakat Indonesia. Kebutuhan pangan akan terus meningkat seiring dengan bertambabnya jumlah penduduk di Indonesia. Sebagian besar produksi padi berasal dari pulau Jawa. Salah satu lumbung padi nasional adalah Jawa Barat. Hampir separuh dari luas areal padi eli Jawa Barat berada di Jalur Pantura yang membentang dari Indramayu, Subang, Karawang, dan Bekasi dengan sistem irigasi dari waduk latiluhur.
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Judul: Nematoda Parasit Pada Gulma Padi Sawah Di Desa Karyasari, Kecamatan Rengas Dengklok, Kabupaten Karawang, Jawa Barat
Abstrak: Gulma didefinisikan sebagai jenis tumbuhan yang tumhuh di tempat yang tidak dikehendaki, tumbuhan yang tumbuh sendiri di antara tanaman yang diusahakan, dan tumbuhan yang belum diketahui kegunaannya serta dapat mengganggu kepentingan manusia dalam mengusahakan pertaniannya. Pada pertanaman padi sawah diketahui terdapat 33 jenis gulma terdiri dari 10 jenis golongan rerumputan. 7 teki-tekian, dan 16 jenis golongan berdaun lebar. Sepuluh jenis gulma yang dominan adalah Monochoria vaginalis, Paspalum distichum, Fimbristilis litloralis, Cyperus difformis, Scirpus junco ides, Marsilea crenata, Echinochloa crusgalli, Jussiea repens, Spenochlea zeyianica, dan Cyperus iria.
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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