Judul: Transmisi radiasi surya dan koefisien pemadaman tajuk tanaman kentang (solanum tuberosum L.) di Galudra, Cipanas-Jawa Barat
Abstrak: Potatoes are one of the important vegetable crops in Indonesia. In general, potato can grow in the tropics and subtropics. In an effort to develop this plant in Indonesia is necessary to study the environmental conditions suitable for the growth and development, in relation to climate variables. One of the important climatic variables is the solar radiation. The study was conducted in the Village of Galudra, Cipanas, West Java with the aim to find the proportion of radiation transmitted by the potato crop and canopy extinction coefficient. Transmission of radiation is the radiation energy that passes on the ground under the canopy while the canopy extinction coefficient is the rate of reduction of radiation by the plant canopy. Transmission of radiation is a function of LAI, where LAI higher LAI will result in reduced transmitted radiation. The canopy extinction coefficient and radiation interception (Qint) increased with LAI. This is because the ability of canopy to cover the soil surface decreases by which so much radiation escapes into the ground under the canopy.
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Judul: Transmisi Radiasi Surya dan Koefisien Pemadaman Tajuk Tanaman Kentang (Solanum tuberosum L.) di Galudra Cipanas – Jawa Barat
Abstrak: Potatoes are one of the important vegetable crops in Indonesia. In general, potato can grow in the tropics and subtropics. In an effort to develop this plant in Indonesia is necessary to study the environmental conditions suitable for the growth and development, in relation to climate variables. One of the important climatic variables is the solar radiation. The study was conducted in the Village of Galudra, Cipanas, West Java with the aim to find the proportion of radiation transmitted by the potato crop and canopy extinction coefficient. Transmission of radiation is the radiation energy that passes on the ground under the canopy while the canopy extinction coefficient is the rate of reduction of radiation by the plant canopy. Transmission of radiation is a function of LAI, where LAI higher LAI will result in reduced transmitted radiation. The canopy extinction coefficient and radiation interception (Qint) increased with LAI. This is because the ability of canopy to cover the soil surface decreases by which so much radiation escapes into the ground under the canopy.
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Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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