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This paper investigates the surface treatment effect of ground tire rubber (GTR) on the water absorption and tensile properties of aged GTR/epoxy composites. The GTR was treated using 10 wt-% NaOH solution and 1 wt-% stearic acid (SA) in acetone. The results showed that the GTR addition increased the water absorption and decreased the tensile strength and elastic modulus of epoxy composites. In dry condition, compared to the untreated GTR, the tensile strength of the treated GTR decreased by about 4.8% and 2.9% for the NaOH-and SAtreated GTR, respectively. Nevertheless, the addition of treated GTR increased the elastic modulus of epoxy composites by about 8.4% and 6.0% for the NaOH-and SA-treated GTR, respectively. For the aged epoxy, the tensile strength and elastic modulus decreased further due to the matrix plasticisation and degradation of the interface GTR/epoxy strength. It was found that the SA-treated GTR has better performance than the NaOH-treated GTR.

Hemodialysis is an artificial kidney replacement therapy that aims to control blood pressure and balance important minerals, such as potassium, sodium, and calcium, in the blood. The osmotic and ultrafiltration processes in the hemodialyzer were affected by the blood viscosity flowed through the permeable membrane of microchannels. In this simulation study the dialyzer was modelled as a microchannel formed by two parallel permeable membrane with pore size of 3 µm and 10 µm of membrane thickness. The distance of the two parallel membrane was 20 µm. The biofluid with viscosity of 4,0 × 10 -3 pa.s; 4,5 × 10 -3 pa.s; and 5,0 × 10 -3 pa.s was then flowed through the microchannel at the flow rate of 10 ml/s. Below the membrane there was counter flow dialisate at flow rate of 20 mm/s. The result showed that the higher the viscosity, the lower the biofluid velocity flowed through the membrane pore. For the above variations, the fluid flow in the pore were found of 0.00013748 m/s; 0.00010341 m/s and 0.00009766 m/s, each. The corresponding pressure on the membrane surface were 4995.964 Pa; 4994.142 Pa; and 4995.890 Pa, each. While the pressure in the pore were a bit higher of 5098.484 Pa; 5084.181 Pa; and 5057.133 Pa, each.

No abstract

Bangko Bangko adalah salah satu kampung nelayan yang terletak di Teluk Bangko Bangko, Desa Batuputih, Kecamatan Sekotong, Lombok Barat, Nusa Tenggara Barat. Di kampung nelayan Bangko-Bangko hanya ditempati 60 keluarga, dengan mata pencaharian sebagai nelayan dan memindang ikan. Karena posisi diteluk perairannya cukup, sehingga banyak ikan yang bias ditangkap, terutama ikan tongkol. Sekitar 200 an perahu nelayan  sandar di Teluk Bangko Bangko, dengan hasil tangkapan berupa ikan tongkol. Melimpahnya hasil tangkapan ikan tongkol mengakibatkan harganya murah, 5 Ribu per Kg ikan segar  dan 7,5 Ribu untuk ikan pindang  per kemasan bambu yang berisi 10 ekor ikan. Tujuan kegiatan pengabdian yang telah dilakukan pada bulan Agustus 2018 untuk meningkatkan harga jual ikan tongkol. Metode kegiatan untuk meningkatkan harga jual ikan tongkol dengan mengolahnya menjadi ikan asap, dengan menggunakan alat pengasapan ikan yang ramah lingkungan.  Hasilnya  ikan asap yang dihasilkan aromanya lebih gurih, bau khas asap, sehingga harganya naik  perkemasan berkisar antar 12.5 Rb sampai 15 Rb. Ikan asap relatif lebih awet tahan lama dibanding ikan segar maupun ikan pindang, sehingga distribusi penjualaannya sampai di Kota Mataram. Luaran kegiatan yang lain  berupa transfer ketrampilan teknik pembuatan dan langkah penerapan pengasapan ikan yang ramah lingkungan, serta buku manual teknik pengasapan ikan. Penerapan alat pengasapan ikan yang ramah lingkungan pada, program pengabdian masyarakat ini dapat meningkatkan kesejahteraan kampung nelayan Bangko Bangko dan sekitarnya.