Judul: Rancang bangun dynamometer tipe rem cakeram
Abstrak: In making dynamometer to become simple, inexpensive, easily without losing the aspect of technology by using vehicle components which are easily found in the market and also has affordable price, we can possibly using the disc brake. The method which is used in this research is the method that commonly based on the functional design approach and the structural design approach. In structural design approach, it was carried out by making the braking systems and a framework dynamometer system that is equipped with a cradle for the engine to be tested. In functional design approach, that’s transmission of power using chain and sprocket. It can be able to reduce the dynamometer rotation. The braking system is used to give the load on the machine that will be measured for the torsion and maximum power.
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Judul: Rancangan dan uji teknis dinamometer tiga titik gandeng
Abstrak: Pengukuran gaya-gaya yang bekerja pada peralatan pengolah tanah merupakan dasar dalam penilaian atas suatu jenis peralatan dan kondisi operasi peralatan itu. Hasil- hasil pengukuran ini dapat dipakai dalam pemilihan jenis peralatan dan kondisi operasi yang terbaik. Tujuan penelitian ini adalah untuk merancang suatu dinamometer yang dapat mengukur gaya horisontal (draft) dan gaya vertikal peralatan tipe "mounted". Bentuk dan tipe konstruksi dinamometer ini didasarkan pada rancangan. Scholtz (1966). Dalam rancangan ini, gaya dideteksi sensor strain gage yang ditempelkan pada dua batang transduser yang berbentuk huruf L dan satu batang transduser yang berbentuk balok persegi empat. Bahan ketiga batang transduser memakai baja ST41. Tegangan-tegangan kerja diasumsikan 20.50 kg/mm² untuk tegangan tarik dan tekan dan 10.25 kg/mm² untuk tegangan geser. Gaya-gaya yang akan diukur menimbulkan tegangan langsung atau tegangan lentur atau kombinasi keduanya pada batang transduser. Tegangan-tegangan ini akan menimbulkan regangan pada batang tansduser dan strain...
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Judul: Durability of Specific Immunoglobulin (Ig) Y Againts Influenza and Covid-19 in Sunscreen
Abstrak: The benefit of specific immunoglobulin Y (Ig Y) as an active ingredient in personal care products such as sunscreen has not been properly studied. Our study aims to evaluate the reliability of specific IgY against influenza and the COVID-19 virus in a sample sunscreen product. Specific IgY influenza and COVID-19 viruses were inserted in the sample sunscreen at two concentrations of 0.1% and 0.25%. Three treatments were observed: control (C) sunscreen without IgY, treatment 1 (T1) sunscreen with 0.1% IgY, and treatment 2 (T2) sunscreen with 0.25% IgY. Organoleptic observations were carried out to monitor changes in aroma, color, and texture, and sunscreen sampling was done every week for 6 weeks. The durability of IgY was evaluated using an enzyme-linked immunosorbent assay (ELISA) and a neutralization assay. Organoleptic observation from weeks 1 to 6 showed consistency in its aroma, color, and texture. Enzyme-linked immunosorbent assay and neutralization assay (NA) results of the T1 and T2 groups showed negative results except for sample T1 at week 5, which showed a positive result in the Influenza A ELISA. Based on the results, it seems that IgY concentrations of 0.1% or 0.25% were not optimal. However, this negative result might be due to low concentration of the IgY and the presence of beeswax, which inhibits IgY and causes it to dissolve in distilled water, thus preventing it from being detected in the assay.
Keyword: Immunoglobulin Y, Sunscreen, Influenza, COVID-19, Biological Activity