Eksperimen pembangkitan plasma lucutan pijar korona telah dilakukan dengan menggunakan konfigurasi elektroda titik dan bidang. Kondisi plasma lucutan pijar korona terbentuk secara optimal pada jarak antar elektroda (d) setinggi 2,1 cm dan 2,4 cm dan arus saturasi (Is) terukur sebesar 0,75 mA dan 1,0 mA. Kondisi tersebut digunakan sebagai dua karakteristik lucutan yang digunakan dalam tahap perlakuan sampel kain sutra alam (Bombyx mori). Pengujian sifat mekanis pada sampel kain sutra alam dengan perlakuan plasma menunjukkan nilai ketahanan jebol yang menurun dibandingkan nilai ketahanan jebol pada sampel kain sutra alam tanpa perlakuan. Pengujian kekuatan serap zat cair (akuades) pada sampel kain sutra alam dengan perlakuan plasma menunjukkan nilai rerata waktu serap (τ) yang lebih singkat dibandingkan nilai τ pada sampel kain sutra tanpa perlakuan. Pada kedua tahap tersebut, pengoptimalan maksimum dari nilai ketahanan jebol dan daya serap zat cair (akuades) dicapai pada jarak antar elektroda (d) setinggi 2,1 cm, arus saturasi (Is) sebesar 0,75 mA dan waktu perlakuan selama 30 menit. Pengujian sifat mikroskopik membuktikan bahwa dengan adanya perubahan struktur permukaan pada sampel cukup berpengaruh terhadap nilai ketahanan jebol dan rerata waktu penyerapan zat cair (akuades) yang dimiliki. Hasil pengujian pada tahap ini juga menyatakan bahwa tidak ada penambahan jenis baru dari gugus fungsi terkandung pada sampel kain sutra alam yang diberi perlakuan plasma. Kata kunci: plasma lucutan pijar korona positif, kain sutra alam, nilai ketahanan jebol, daya serap zat cair, sifat mikroskopik ABSTRACT Experiments on the generation of corona glow discharge plasma have been carried out using the multiple points to plane electrode configuration. The condition of the corona glow discharge plasma was formed optimally at 2.1 cm and 2.4 cm distances between electrodes (d) and with the saturation current (Is) of 0.75 mA and 1.0 mA. These conditions were used as two treatment discharge characteristics on samples of natural silk fabric (Bombyx mori). Mechanical property test on the treated sample of natural silk fabric showed that the fiber breakdown resistance value was decreased than the fiber breakdown resistance value in the untreated sample of natural silk fabric. Liquid absorbency strength test on the treated sample of natural silk fabric showed that the absorption time average value (τ) took less time than the τ value in the untreated sample of natural silk fabric. At both stages, the maximum optimization of the breakdown resistance value and liquid absorbency strength was achieved at 2.1 cm distance between electrodes (d) with the saturation current (Is) of 0.75 mA and the treatment time of 30 minutes. Microscopic properties test proved that the change in surface structure on the treated sample had sufficient influence on the breakdown resistance value and the liquid absorption time average value (τ). The test results at this stage also stated that there was no addition of new types of functional groups contained in the tr...
<p class="AbstractText">Performance characterization of 450 nm visible light photoacoustic imaging has been carried out through phantom imaging of methylene blue (MB), methyl orange (MO), and methyl red (MR) dye solutions. The phantom was made of a nylon tube with a diameter of 5.0 mm (outside) and 4.6 mm (inside) having a height of 2.0 mm along with a 6×6 cm black galvanized aluminum plate as the background medium. The nylon tube was filled with each type of solution with varying molecular concentrations of 10, 25, 50 and 100 ppm. Twelve (12) phantom objects were imaged in an area of 10×10 cm. The visible absorption peak known from UV-Visible spectroscopy for each type of solution is at 664 nm (methylene blue), 465 nm (methyl orange), and 522 nm (methyl red). It was also known that the amplitude of PA emissions would increase proportionally to the concentration of dye molecules. Overall, methyl orange solutions had the highest photoacoustic emission amplitude distribution. The analysis showed that the ratio of inner diameter (ID) and wall thickness (WT) between the MB and MO phantom images to the original object were 1:0.83 and 1:0.74 (ID) and 1:3 and 1:1.5 (WT), respectively. On the other hand, the ratio of the outer diameter (OD) of the MR phantom image to the original object is 1:1.28. </p>
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