IPTEK Journal of Proceedings Series
Not a member yet
757 research outputs found
Sort by
Vessel Collision Avoidance System (VCAS) Based on AIS Data
Get PDFIn Indonesia, Maritime transportation delivers more than 71% of 96% to international trade in the world. It is a huge contribution to Indonesian economy. But, it is in contrary in the matter of safety. Based on National Transportation Safety Committee, there are 31 marine accidents, and around 25% of them is ship collisions which caused by human error. Accordingly, the research proposes a design of Vessel Collision Avoidance System (VCAS) based on AIS data as the input of vessel identification trajectory by using Fast Patrol Boat. As the result, this paper simulates Fast Patrol Boat maneuvering to prevent collision with another vessel
Interfacial Properties and Foamability of Amphiphilic Molecules
Get PDFSurface-active molecules are widely used in industry. Triton X-100, sodium lauryl ether sulfate, sodium dodecyl sulfate and bovine serum albumin are commonly used in daily products. They can form foams because of adsorption phenomena at the surface. Each molecule has its own characteristic and foaming ability. This research deals with relation between interfacial properties and foamability by using three different methods: the Wilhelmy plate method to verify the CMC value, the maximum bubble pressure to determine dynamic surface tension, and the Bikerman method to assess the foamability. Interfacial properties and foamability will be studied and the difference observed between surfactant and protein will be discussed
Evaluation of The Suitability of Urban Parks Based on The Characteristic of The Elderly’s Needs in Surabaya
Get PDFThe number of elderly people in Surabaya City is growing fast, with the largest population in Development Unit (UP) Tunjungan. It resulted to the needs of elderly facilities, such as parks. The elderly have certain characteristics, so the designing of elderly park need a specific approach. Therefore, the research’s objective is to evaluate urban parks in UP Tunjungan that suitable for characteristic of the elderly’s need. The research’s methods is qualitative descriptive. The evaluation of eight parks in UP Tunjungan based on general criteria of elderly park through character appraisal analysis. The result is to find out the most suitable park to be designed as Elderly Park that meets 7 out of 10 sub criteria of an elderly park
Organic Geochemistry Studies Aliphatic Fraction Bontang Coal, East Kalimantan
Get PDFThe free radical scavenging activity of Mangiferaindica L. Leaves had been performed. The methanol extract showed the highest 2,2’-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) free radical scavenging activity among other extracts. Bioassay guided fractionation was performed and yielded three isolated compounds. Their structures were identified as mangiferin (1), friedelin (2) and lupeol (3). Mangiferin exhibited free radical scavenging activity, with an IC50 value of 12.12 µg/mL in vitro
Determination Analysis of Dish Collector Focal Shape in Vertical and Horizontal Direction of Concentrating Solar Power System
No full textA CSP (Concentrating Solar Power) system must have a receiver to receive solar ray reflection from parabolic dish collector. Based on the receiver installation to the collector, there are two type installation such as parallel to collector (horizontal direction) and perpendicular to collector (vertical direction). In this research not only we compared the receiver orientation but also we varied geometry concentration ratio. The experiment results show that the focal shape diameter elongates 2 mm and surface temperature increases 5-10°C for vertical orientation with greater concentration ratio. However, there is no significant effect to receiver with horizontal orientation. Thermal efficiency was affected by radiation and convection heat loss but for geometry concentration ratio above 100, radiation and convection heat loss gived small impact
Design of Temperature Measurement System on The Drying Process of Madura Tobacco Leaves
Get PDFThe quality of dried chopped leaves of tobacco is an important factor. The present work developed an oven for drying process to measure and evalute on drying shrinkage characteristic of choped leaves Madura tobacco. The oven has three racks for analyzing and monitoring the rate of drying shrinkage of Madura tobacco. Every rack has a different amount of chopped leaves as follows: 120 g on top rack, 100 g for middle rack and 80 g for bottom rack. Rate of drying shrinkage was analyzed for 20 minutes. The results showed that every rack has different rate of drying shrinkage for drying time. The rate of drying shrinkage was achieved at 26-35% for all racks with temperature distribution in oven at 25 – 30 C
Self Tuning Sliding Mode Control for Quadrotor Waypoint Tracking
Get PDFIn this paper, self-tuning sliding mode control is proposed to control quadrotor with mass parameter uncertainty on waypoint trajectory tracking. Parameter uncertainty is one of the factor that cause instability of quadrotor. Self-tuning sliding mode control is used to maintain the stability of quadrotor in this parametric uncertainties condition. The simulation results show that the quadrotor can track the waypoint trajectory in the presence of parameter uncertainty
Solving Course Timetable Problem by using Integer Linear Programming (Case Study IE Department of ITS)
Get PDFMaking IE department of ITS course timetable by determine the hard and soft constraints then develop an integer programming (ILP) model method to solve this NP-complete problem of Timetabling for solving Hard constraints Assignment problem and to solve the Soft constraints use Penalty Algorithm. Use LINGO software for solving suggested mathematical model to get the final results. Then do numerical analyzes for that results. Finally it achieves the goal for solving the Course Timetable. And get feasible solution of timetable as well as it gets the best required objective what it can get from the case study which is 356 events and it reduces the time of getting one timetable to be just one hour after it was at least 2 weeks
Esterification of Waste Cooking Oil Using Heterogeneous Catalyst: An Experiment for The Catalytic Chemistry Laboratory
Get PDFThe basic concept of the use of catalysts can be studied in the course of chemical catalysts. The use of heterogeneous catalysts offers many advantages, such as: the catalyst can be easily separated from the reaction mixture without the use of solvent. Chemical catalyst can be studied through experiments of esterification reaction of waste cooking oil with methanol using heterogeneous catalyst in the process of making biodiesel. Esterification results showed that the highest conversion (83%) was obtained by metakaolin catalyst at a reaction temperature of 160 °C for 2 hours at oil to methanol ratio of 1:30
Enhancement Concentration of Bioethanol Through Packed Sieve Tray Distillation
Get PDFBioethanol is one of alternative renewable energy that can be produced by distillation process. Distillation itself is a method of separation and purification that most widely used in the chemical industry. Nowadays, distillation equipment that is commonly used in the industry is sieve tray tower due to its affordable in cost and simplicity in design. Its performance can be improved by the addition of packing on the tray can improve efficiency. This study aims to evaluate the performance of the developed steel wool packing in sieve tray distillation with regards to the bioethanol purity. Our results showed that the addition of the developed packing in each tray significantly increased the concentration of ethanol up to 99.5