Judul: Modification of spraying system for weed control utilize with knapsack electric sprayer
Abstrak: In agriculture, spraying aims to protect crops from disrupting organisms to increase farmers’ profits. Spraying using a spraying tool has an advantage in that it spreads granules evenly to plants; furthermore, the size of the granules can be adjusted according to the need. This research aimed to modify the spraying system on the sprayer output to reduce the shift in spraying points on sprayed granules as a result of the wind blow from the environment. This electric sprayer consists of several components which are not found in a power sprayer or manual sprayer such as a 12-V battery or a 5.8 bar-pressure water pump. The result of the pressure comparison on the outlet showed a significant difference, namely in a 3-bar manual sprayer and a 4-bar electric sprayer. The pressure difference resulted in the difference in discharge, the length and width of the spraying.
Keyword: sprayer, pressure, manual, electric, discharge

Judul: Evaluation of Electric Knapsack Sprayer Performance
Abstrak: Sprayer gendong elektrik menggunakan baterai untuk menggerakkan pompa dalam menghasilkan tekanan cairan sehingga akan mempengaruhi kinerja pompa sprayer gendong elektrik. Penelitian ini bertujuan mengevaluasi kinerja penyemprotan dari sepuluh merek sprayer gendong elektrik. Parameter uji kinerja sprayer gendong elektrik terdiri atas ketahanan tegangan baterai, tekanan penyemprotan, debit penyemprotan, analisis getaran dan kebisingan serta evaluasi menggunakan metode pembobotan berdasarkan kriteria evaluasi. Hasil penelitian menunjukkan bahwa tegangan awal baterai sebesar 12,02 volt hingga 12,12 volt, tekanan penyemprotan sebesar 225 kPa hingga 331 kPa dan debit penyemprotan sebesar 1,40 liter/menit hingga 1,80 liter/menit. Besar getaran sepuluh sprayer gendong elektrik rata-rata lebih besar dari 7,00 m/s2, yaitu sebesar 6,43 m/s2 hingga 18,07 m/s2. Skor terbobot tertinggi adalah sprayer elektrik merek D dengan total skor terbobot sebesar 100,00 dan sprayer I urutan kedua dengan total skor terbobot sebesar 98,40. Hasil evaluasi menunjukkan bahwa sepuluh sprayer gendong elektrik dapat bekerja secara optimal (nilai skor terbobot lebih dari 90,00). Dampak getaran dapat dikurangi dengan cara memasang alas punggung pada sprayer., Electric knapsack sprayers use batteries to drive the pump to produce liquid pressure, which will affect the performance of the electric handheld sprayer pump. This study aims to evaluate the spraying performance of ten brands of electric handheld sprayers. The test parameters of electric handheld sprayer performance consist of battery voltage resistance, spraying pressure, spraying discharge, vibration and noise analysis and evaluation using a weighting method based on evaluation criteria. The results showed that the initial battery voltage was 12,02 volts to 12,12 volts, spraying pressure was 225 kPa to 331 kPa and spraying discharge was 1,40 liters/minute to 1,80 liters/minute. The average vibration magnitude of the ten electric sprayers is greater than 7,00 m/s2, which is 6,43 m/s2 to 18,07 m/s2. The highest weighted score was the D brand electric sprayer with a total weighted score of 100,00 and the I sprayer came second with a total weighted score of 98,40. The evaluation results show that the ten electric sprayers can work optimally (weighted score values of more than 90,00). The impact of vibration can be reduced by installing a back mat on the sprayer.
Keyword: Sprayer gendong elektrik, tekanan penyemprotan, tegangan baterai, debit penyemprotan

Judul: Studi Kasus: Leiomioma pada Seekor Singa (Panthera leo)
Abstrak: This report described an abdominal leiomyoma in a female old lion (Panthera leo) from the Ragunan Zoo, Jakarta. The aim of this study was to identify the type of tumor from an old aged female lion with anamnese suffered from chronic gangrene on the right-rear leg. The lion was euthanized and then accompanied with necropsy. Gross findings were recorded and then histopathological examination of some organ samples done. Macroscopic observations showed several lesions. A tumor was found in abdominal cavity, has 14.5 x 9.8 x 6.5 cm in sized. The tissue sample from the tumor mass was further examined using histopathological examination. Based on the morphology, the tumor consisted of spindle-shaped cells with a cigar-shaped nuclei with blunt ends. Mitotic figure was <3, indicated that the tumor was benign. Masson's Trichrome staining showed that among the tumor cells are found collagen bundles (blue). Desmin immunohistochemical staining showed a positive result, that mean the tumor cells derived from smooth muscle cells. Other immunohistochemical stainings e.g. Vimentin, Glial Fibrillary Acidic Protein (GFAP), and Proliferating Cell Nuclear Antigen (PCNA) were negative. According to morphological and immunohistochemical characters, the tumor was diagnosed as leiomyoma.
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