Textile materials, especially yarns formed from polymers such as polyester during deformation, have viscoelastic properties, namely a combination of elastic and viscous properties. Several studies have been conducted to model viscoelastic on textile materials, especially yarns. In this study, modelling is done by fitting data through experiments which are then modelled with a theory of the modification of the Maxwell model as a reference in making predictions through the data fitting method. The results of the data fitting prediction in the form of exponential curves have a regression value that approaches the experimental curve (R 2 = 0.999 and 0.999).

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Metal coatings are starting to be widely used as a way to prevent metals from corroding. In addition to preventing corrosion, metal coatings have been developed to thicken metals, increase hardness, wear resistance, and corrosion resistance. Characterization of the materials used using SEM, and XRD. The SEM characterization results show a crystal shape similar to a pyramid. The increasing coating time will increase the crystal size with the preferred plane orientation direction is [111] with the largest crystal size in the experiment with a time of 4.5 h which is 55.44 nm using the Williamson-Hall method.

Limbah cair tahu merupakan proses dari pengolahan produksi kedelai menjadi tahu. Limbah cair bewarna kuning dan keruh yang berbau sehingga menjadikan polusi udara dan mengganggu kenyamanan lingkungan. Limbah yang dihasilkan dibuang di saluran air sehingga mengganggu kualitas struktur dan air tanah. Untuk mengurangi dampak pada lingkungan di Primkopti Swakerta Semanan, Kalideres, Jakarta Barat dilakukan pengujian kualitas air limbah tahu dengan menguji TDS, EC dan pH dengan menggunakan teknologi Elektrokoagulan. Nilai TDS sebelum pengujian 2.702 ppm dan setelah pengujian 2.070 ppm. Nilai pH limbah sebelum pengujian 5.1 dan setelah dilakukan pengujian bernilai 5.4. Nilai EC sebelum pengujian 4.965 μs/cm dan setelah pengujian bernilai 4.140 μs/cm.

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