Judul: Analisis Gaya Pada Pintu Klep Air PastifasetModel Frame Lurus (PA-FG1)
Abstrak: The rate of food needs is directly proportional to the population growth; must be balanced with the development of agricultural technology innovations that can make use of all existing land conditions. The technology can be used in these circumstances is the application of tidal irrigation. The study aimed to analyze the force that occurs on hydromechanical sluice. Based on the results of the calculation, the maximum value of the placement reaction of HA is 1633.33 N, of HB is 3266.67 N, the value of style vertical slats sluice is 900 N and 3500 N. On the condition when the sluice opened, the greater the angle, the greater openings HA force. This is due to the resultant force of downstream greater than upstream. For sluice with head difference of 0.08 m, aperture angles 45o and 60o have differences with another sluice condition occurs where the force is inversely proportional to discharge. This can happen because the horizontal force component switches to the vertical component. The weight of the door is a major component of the vertical force the door itself. Budget plans are used to construct sluice is Rp177.888.400, -.
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Judul: Design Of Variable Rate Fertilizer Applicator Frame
Abstrak: Frame for variable rate fertilizer applicator has been developed in order to mount the unit with the transplanter. The purpose of this study is to design and analyze its performance in paddy fields. The design of the frame unit was carried out with Computer Aided Design Software based on data obtained through the formulation and refinement of the idea of design and analysis of strength of material. The main function of the frame is to support hopper unit which has 120 kg weight. Variable rate fertilizer applicator unit consisted of four fertilizer hoppers, each equipped with a variable metering device which powered by a DC electric motor. Once designed, then prototype was built and its performance was tested in the experimental paddy field of the Mechanical and Biosystem Engineering Department, Faculty of Agricultural Technology, Bogor Agricultural University. The results of functional test and field performance test showed the designed prototype was function properly and was able to support the load generated by four filled hoppers full of fertilizer (120 kg). Average sinkage on an empty hopper was 21.60 cm, while the average sinkage on filled hopper was 24.74 cm. The average slip for empty hopper was 16.3% while the average slip for filled hopper was 20.2%.
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Judul: Mitochondrial DNA Gene Organization and Phylogenetic Relationship of Naja siamensis
Abstrak: Naja siamensis is one of Asiatic cobra in the Family of Elapidae, known as a cryptic snake. It has many morphological variations that lead to misidentification. Misidentification can cause the wrong concept in developing antivenom types due to high snakebite cases occur in Thailand. Thus, an accurate species identification using a molecular approach is crucially required. Mitochondrial DNA has been used widely in snake molecular studies. These studies were aimed to determine the arrangement of the N. siamensis partial mitochondrial genes using reptile-oriented primers and to reveal the phylogenetic relationship among other species of Asian cobra. DNA extraction was carried out based on the standard DNA salting-out protocol and was conducted by bioinformatics analysis using BLASTn and MEGA 6 software. Gene annotation was performed against N. kaouthia complete genome. A total of 3121 bp of N. siamensis mtDNA genes were sequenced consisting of partial of six regions: 16S rRNA, ND1, tRNA-Ile, CRII region, tRNA-Leu, tRNA-Gln, and COI genes. The mtDNA gene organization of N. siamensis was predicted to has a similar pattern with the common Elapidae mtDNA gene organization. This study showed that there is a monophyletic form in Naja genus and N. kaouthia is the closest species with N. siamensis based on partial 16S rRNA and ND1 gene.
Keyword: 16S rRNA, Elapidae, ND1, phylogenetic relationship