Desain Self-Propelled Oil Barge (SPOB) untuk Distribusi Crude Oil di Kabupaten Sorong, Papua Barat

Papua Barat merupakan provinsi penghasil minyak bumi yang ada di Indonesia bagian timur, salah satu daerah yang memiliki potensi tersebut adalah di Kabupaten Sorong. Dengan dikenal sebagai julukan kota minyak, kabupaten yang memiliki ibukota dengan nama Sorong tersebut memiliki 350 sumur minyak dan mampu memproduksi sekitar 3.321.698.000 barrel per tahun [1]. Dari hasil tersebut menjadikan produksi minyak bumi sebagai penyumbang devisa daerah terbesar setelah sektor perikanan dan industri kayu. Jalur distribusi minyak bumi daerah kabupaten Sorong terdapat di sepanjang selat yang memisahkan antara Pulau Papua dan Pulau Salawati. Berdasarkan dampak turunnya harga minyak dunia dan dilakukan langkah penghematan pengeluaran biaya Perusahaan, maka dibutuhkan suatu inovasi alat transportasi pengangkutan minyak bumi dari yang selama ini hanya menggunakan tongkang yang ditarik oleh kapal tunda. Self-Propelled Oil Barge (SPOB) diharapkan menjadi inovasi solusi yang cukup baik dalam hal sarana transportasi minyak bumi di daerah Kabupaten Sorong. Dengan mencari rata-rata payload dari hasil perhitungan optimasi penentuan rute distribusi dengan metode Traveling Salesman Problem, yang selanjutnya akan dijadikan nilai owner requirement. Lalu dengan menggunakan metode optimation design approach, Self-Propelled Oil Barge dihitung dan dirancangan dengan beberapa batasan untuk mencari nilai pembangunan kapal yang paling minimum. Dari proses optimasi didapatkan ukuran utama barge adalah L = 70.31 m, B = 12 m, H = 5.50 m, T = 4.40 m

Demarcation point between juvenile and mature wood in Sengon (Falcatarua moluccana) and Jason (Anthocephalus cadamba)

Declining natural forests in Indonesia has forced communities to search for alternative sources of wood. In order to meet the demand, wood is taken from fast-growing species grown in community forests. The species have short cutting cycle and contain a large proportion of juvenile woods. This article discusses the characteristics and demarcation point of juvenility in sengon (Falcataria moluccana) and jabon (Anthocephalus cadamba) at two different ages (5 and 6 years old) based on density, fibre length, rnicrofibril angle and modulus of rupture. Segmented modelling approach was used to estimate juvenile and mature transition and the SAS non-linear procedure was applied to identify the juvenile to mature transition ring. To determine juvenile and mature transition ring for sengon and jabon, three trees of each species and age were sampled from a community forest. in Sukabumi, Bogor, Indonesia. Discs of 2 cm thick were collected to determine density, modulus of rupture (MOR), fibre length and microfibril angle. Density was measured along the radial from pith to bark by X-ray densitometry. Fibre length and microfibril angle were measured on isolated segmented rings of 1-cm width from pith to bark. Results showed that fibre length and microfibril angle were better anatomical indicators of demarcation point between juvenile and mature wood than density and MOR. The segmented regression models for radial patterns of variation in fibre length and rnicrofibril angle revealed that juvenility in sengon and jabon extended up to 6 years old. (Résumé d'auteur

Signet-Ring Cell Carcinoma of the Ampulla of Vater

Signet-ring cell carcinoma (SRCC) of the ampulla of Vater is a very rare case and only 28 cases have beed reported in the English literature. Herein, we report a 59-year-old woman with SRCC of the ampulla of Vater. She developed symptoms of obstructive jaundice at early stage of disease and underwent pylorus-preserving Whipple procedure as definitive treatment. Histopathology examination showed numerous tumor cells with intracytoplasmic mucin and eccentric nuclei. Her tumor has already invaded the serosa of duodenum, but no infiltration to the stomach, pancreas, and lymphovascular structure. Her surgical margins and regional lymph nodes were free of tumor. She was diagnosed with T2N0M0 SRCC of the ampulla of Vater. No adjuvant treatment was given and she has been doing well for five months after surgery

Electrodeposition of nanocrystalline Ni-Mo alloys from alkaline glycinate solutions

The induced electrodeposition of nanocrystalline Ni-Mo alloys was investigated using two different molar ratios of Ni:Mo in sodium glycinate solution at pH 9.3. The chemical nature of the Ni2+ and MoO4 2- in alkaline glycinate solution was studied using UV-Vis absorption spectroscopy. The composition of the coating layer was determined using EDX. The crystallinity of electrodeposits was examined using XRD, whereas, the morphology and topography were investigated using SEM and AFM, respectively. The corrosion resistance of Ni-Mo alloys compared to pure Ni was studied in 3.5 % NaCl solution using potentiodynamic polarization and electrochemical impedance techniques. Ni-Mo alloy electrodeposited from the solution containing [MoO4 2-]/[Ni2+] molar ratio of 0.2 show higher corrosion resistance compared to plating solutions of molar ratio 0.1 and pure Ni.NPRP Grant 4-306-2-111 from the Qatar National Research Fund (a Member of The Qatar Foundation).Scopu

Influence of Bath Composition at Acidic pH on Electrodeposition of Nickel-Layered Silicate Nanocomposites for Corrosion Protection

Nickel-layered silicates were electrochemically deposited from acidic bath solutions. Citrate was used as a ligand to stabilize nickel (II) ions in the plating solution. The silicate, montmorillonite, was exfoliated by stirring in aqueous solution over 24 hours. The plating solutions were analyzed for zeta-potential, particle size, viscosity, and conductivity to investigate the effects of the composition at various pHs. The solution particles at pH 2.5 (−22.2 mV) and pH 3.0 (−21.9 mV) were more stable than at pH 1.6 (−10.1 mV) as shown by zeta-potential analysis of the nickel-citrate-montmorillonite plating solution. Ecorr for the films ranged from −0.32 to −0.39 V with varying pH from 1.6 to 3.0. The films were immersed in 3.5% NaCl and the open circuit potential monitored for one month. The coatings deposited at pH 3.0 were stable 13 days longer in the salt solution than the other coatings. X-ray diffraction showed a change in the (111)/(200) ratio for the coatings at the various pHs. The scanning electron microscopy and hardness results also support that the electrodeposition of nickel-montmorillonite at pH 3.0 (234 GPa) had improved hardness and morphology compared to pH 2.5 (174 GPa) and pH 1.6 (147 GPa)

Natural weathering on coated tropical woods

Abstract Teak and pine are common wood species in Indonesia. The purpose of this research is to evaluate the performance of the coating layer in these wood species after six months natural weathering. The durability on natural weathering is evaluated due to microbial disfigurement (fungi or algae), checking and cracking, whereas microbial disfigurement (fungi or algae) is evaluated using ASTM D 3274-95, checking with ASTM D660-93, and cracking with ASTM D 661-93. Wood samples of 30 (l) × 15 (w) × 2 (t) cm are sanded before painted, then preservatives, water repellents, and its combinations are applied on the surface of the samples. The results showed that the coating layer of the combination of paint and preservatives and the combination of paint and water repellents could provide better protection of the surface on long rotation teak, short rotation teak, and pine boards against microbial disfigurement, checking and cracking compared to the other coating layers after 24 weeks of natural weathering. The coating layers on long rotation teak and short rotation teak gave better protection against microbial disfigurement, checking and cracking than pine wood. The coating layer on the radial section gave better protection compared to the tangential section. However, the durability of the coating layer on the radial and tangential section is not significantly different.</jats:p

Enhancement of Corrosion Resistance of Stainless Steel by Electrodeposition of Metal Alloy Film Incorporation with Layered Ceramic Particles

Abstract not Available.</jats:p

The Efficacy of Pine Wood Pellets reinforced with Active Hexaflumuron Against the Subterranian Termite Coptotermes curvignathus Holmgren

Abstract Bait formulation using hexaflumuron is the most used baiting techniques because it is relatively friendly to the environment. One of the potential wood species for bait formulation for termites is pine wood. The resin in pine wood can reduce termites preference. Therefore, the resin contained in pine wood needs to be reduced so that the level of termites preference for pine wood can be increased. This study aims to determine the efficacy of the bait formulation in the form of pellets from pine wood (Pinus merkusii Jungh er de Vries) which was pre-treated with presto (0.4 bar, 100 °C) for one, two, three, four, and five hours with active hexaflumuron (0.25%) against subterranean termites Coptotermes curvignathus. Pine wood chips were treated with presto for one hour, two hours, three hours, four hours, and five hours. The treated pine wood chips then made into sawdust by 40-60 mesh. Pine sawdust then added with hexaflumuron (0.25%) and formed into pellets without adding any adhesive material and then fed to the subterranean termites C. curvignathus (JIS K 1571: 2010). Solid pine wood used as a control sample. The result showed that palatability of formulation pellet bait with active hexaflumuron (14.33%) was higher than solid pine wood (6.58%). The formulation of pellet bait with 0.25% active hexaflumuron with presto pre-treatment was able to eliminate C. curvignathus termites.</jats:p