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Published by Institut Sains dan Teknologi AKPRIND

ISSN : 19798415 EISSN : - DOI : -

Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Articles 583 Documents

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STUDY PEMODELAN IMPAK PADA PANEL BAHAN KOMPOSIT DENGAN METODE ELEMEN HINGGA Saputra, Hadi; Rochardjo, Heru Santoso Budi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 1 Agustus 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Generally manufacturing of composite materials is performed using trial and error method.The finite element method show the capability to optimize that process.The efficient formulation for simulating high speed impact usually uses explicit dynamic method. The purpose of this research is modelling impact loading on composite panel using finite element method as a part of preprototyping impact resistant composite material.The process of impact simulation on composite panel using explicit dynamic formulation can be done using commercial application software, that done with variation on impactor velocity (200, 400, 600, 800, 900, and 1000m/s), impactor geometry likes cone and blunt, Elasticity modully of lamina composite materials, the direction of fiber as symmetric cross plies and symmetric angle plies, and the thickness, 4, 6, 10 plies.The result showed that impact simulation on composite panel using this software can be performed well, the influence of impactor velocity shows increased the Von Misses Stress with average value 2.41% (in 200-400m/s), 1.59% (in 400-600m/s), 1.28% (in 600-800 m/s), 1.20% (in 800-1000m/s). Cone A type with the smallest area of contact have the best capability to penetrated compared with B type and blunt type. Symmetric angle plies have better impact resistant compared with symmetric cross plies.

APLIKASI GROUP TECHNOLOGY BERDASARKAN ANALISIS PART DAN MESIN UNTUK MENENTUKAN ONGKOS PERPINDAHAN MATERIAL Susetyo, Joko
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 3 No 2 Februari 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Bond Energy Algorithm (BEA) is a method that used in this group technology. This method is used for analyzing and for group is machine-part into manufacture cell. Euclidean distance is used for measuring material handling distance. BEA method becomes a model on stating the expense. The choice is done with performance measure calculation. Based or grouping result using Bond Energy Algoritm method produce five manufacture cell, they are cell 1 from machine 1 and part 14-12, cell 2 from machine 2-3-8-9 and part 4-11-13, cell 3 from machine 4 and part 10-1, and cell 4 from machine 5 and part 6-2. Cell 5 machine 7-6 and part 5-3-9-7-8. The result of material handling distance measurement is 220.97 meters with material handling cost Rp 12,245,832.57 per month. Based on the result of group technology lay out produce or yield material handling cost that can be used as new alternative on designing lay out.

ANALISIS ERGONOMI TERHADAP KONDISI INTERAKSI MANUSIA-MESIN MELALUI PENDEKATAN PARTISIPATORI PADA BENGKEL KAYU JURUSAN TEKNIK SIPIL POLITEKNIK NEGERI BALI (PNB) Sudiajeng, Lilik; Oesman, Titin Isna; Sutopo, Nyoman
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 3 No 2 Februari 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Woodworking industries is one of the funding resources of Indonesia. Mechanization was done but less awareness of occupational safety and health, so there were still high risk of occupational accidents and diseases. One of the main problems was man-machine interaction. Research was conducted at the woodworking workshop Bali State Polytechnic with 13 students as participants. It was a participatory research with one group pre and post test design. Result showed that the clearance among machines was about 1.2 â€“ 1.5 m, while the shoulder width and the distance of spreading armsâ€™ participants were 0.52 m and 1.825 m (percentile-95). The terminal blade of radial saw was 30.5 cm out of reach limit (percentile-5). In addition, the terminal ankle blade of drilling machine was 36.5 cm out of reach limit (percentile-5). Participants got complains for the right shoulder (76.92%), left shoulder (69.23%), the right and left hips (61.54%) and low back (53.85%). In similarities, 54.62% of participants got weakened activities, 44.62% got weakened motivation and 68.46% got physically fatigue. In conclusion, the man-machine interaction was not harmony and caused musculoskeletal complain and fatigue. It is needed the improvement of work condition to protect the workersâ€™ safety and health.

PEMANFAATAN ECENG GONDOK UNTUK MEMBERSIHKAN KUALITAS AIR SUNGAI SUNGAI GADJAHWONG YOGYAKARTA Setyanto, Kris; -, Warniningsih
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 1 Agustus 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

River is one source of water is important sanga ang existence, in urban areas are often neglected maintenance stream. Many found the river full of garbage, not flowing and odorless. Gadjahwong River is one of the river in Jogjakarta through the city of Jogjakarta, there right dikiri industrial areas such as SGM milk factory, leather factory, etc. Budi Makmur. These rivers across the eastern part of the city of Jogjakarta, the secondary data and previous studies the parameters of BOD, COD, TSS and high Poop coli can be used as raw drinking water, can only be used for irrigation and agriculture. The method used in this study is first to determine the area of the river, installing nets to grow sisal plant, water hyacinth breeding. kmeudian test characteristics of river water before treatment. The next test stream water purification with water hyacinth after sam-pling continued with before, in the group after group of plants and water hyacinth plants, carried out per 2 weeks for 2 months. Based on the data for all parameters studied pollutants were water-quality parameters for turbidity, color, COD, BOD, Fe and ammonia from time to time is always changing levels. There is a tendency to decrease pollutant parameters hyacinth clumps position that more and more.

PENGUKURAN NILAI VISKOSITAS OLI MESRAN SAE 10â€“SAE50 UNTUK PENDINGIN TRANSFORMATOR DISTRIBUSI DENGAN PENAMPIL LCD -, Mujiman
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 1 Agustus 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Lubrications 0il is the main support of the working of a machine. Not only that, even this oil also determine the performance and engine durability. The better quality oil is used, the better the performance and engine durability. Function not only as a lubricating oil, but also as a cooling and cleaning machinery. As a lubricant, lubricating oil (lubricating) all moving parts inside the machine to prevent direct contact among components which made of metal. In this case, the element, thickness (viscosity) isveryimportant.As coolant, oil must also be able to reduce the heat generated by friction antarlogam on a machine that moves, such as valve (valve) or bearing (ball bearing).

PEMANFAATAN LIMBAH SERAT INDUSTRI TEPUNG SAGU AREN SEBAGAI BAHAN BAKU PEMBUATAN KERTAS (PULP) DENGAN PROSES DELIGNIFIKASI -, Purnawan
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 1 Agustus 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

There are several home industries in sago aren processes center in Daleman, Tulung, Klaten, Central Java, produce sago aren flour product (soun) an average of 200 tons/year, these home industries produce waste by product of sago fibre. The process of pulp from sago fibre is done by two steps of the process, step one is with using nitric acid (HNO3) and second process with soda coustic (NaOH). The process is conducted in three neck flask equipped with a stirrer, and cooller. The temperature is kept constant. Delignification process of sago aren fibre was carried and by two steps. Firstly 10 grams of sago fiber adds by 400 ml of HNO3 7.5%. Secondly the product of step one adds by 400 mL of NaOH 7.5%, while the condition of both steps one kept on temperature of Â±103 0C, and the stirring speed of 400 rpm, obtained relatively good condition by using NaOH concentrations of 7.5% and 1.5 hours of processing time. In these conditions the percentage of product cellulose results obtained is 33.41%, with the permanganate numbers of 1.28, the concentration of Î± cellulose 95.74%.

PERBAIKAN FAKTOR DAYA DENGAN PENAMBAHAN NILAI KAPASITOR SEBAGAI PENGHEMAT ENERGI LISTRIK PADA BEBAN LAMPU FLUORESEN Suyanto, Muhammad
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 3 No 2 Februari 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The use of electrical energy is made as efficient as possible, therefore to get the economical value, especially in the use of Fluorescent lamps, it is necessary to make an effort how to use energy that approach the installed value. The effort was dane by in cir-cuit tests using fluorescent lamps with different capacitor values and comparing them with economical lamps. Having obtained the capacitor values, the experiment were carried out to collect the actual data of the installed power. The resuls of the experiments were analyzed and showed that the increasing values of capasitors were followed by better power factors so they approached the associated installed powers.

PENGATURAN SISTEM SHIFT KERJA UNTUK MENINGKATKAN PERFORMANCE SERTA MENGURANGI KELUHAN KARYAWAN Fajarwati, Ferisia Dwi; Hidayat, Rachmad; Agustina, Fitri
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 1 Agustus 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Reduce fatigue and saturation levels of employees in a company's performance will affect the results and how they work in completing a job. Shift work system settings are useful for the company because with the shift work system will be able to improve performance and reduce employee complaints. Analyses were performed by the method of Analytical Hierarchy Process (AHP). Weighting the results indicate that the type of complaints for the morning shift caused by physical factors of 62 299%, with sub-criteria of 58 277% fatigue. On the night shift, the most influential type of complaint is the physical factor of 50 616%, with sub-criteria of fatigue by 59.1%. Setting a new work shift in the recommended improvements that include changes in rotation length. Arrangements made â€‹â€‹by rotating shifts some employees who are divided into groups or group. Setting a new work shift system increases job performance of employees and reduce the level of employee complaints. Turnover shift work increases the sense of responsibility and work together as a team work. Shift work rotation to reduce employee complaints of fatigue in nature because the conditions of a monotonous work environment.

KARAKTERISTIK MINERALOGI ENDAPAN NIKEL LATERIT DI DAERAH TAMBANG TENGAH (BUKIT TLA2) PT. ANTAM Tbk. UBP NIKEL POMALAA SULTRA -, Musnajam
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 3 No 2 Februari 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

This research is aimed to understand the mineralogy of nickel laterite deposit and geochemistry of ultramafic rock, the samples were taken from 14 drilling holes The data is analyzed to conduct weathering geochemical profile to identify lateritization, laterite profile development, characteristics and elements enrichment process in weathering zones. Lithology of the study area is composed by dunite and lherzolite, That dominated by livine, pyroxene and serpentine, also opaque minerals such as chromite and magneti-te with small percentage. Based on X-Ray Diffraction analysis known that the clay mine-rals are chlorite, clinochlore, kaolinite, and dyckite. Based on geochemical analyzes, the mineralogy characteristics of study area showing the different behavior for each element, due to the weathering rate and the dept of cores. The different behavior each element during weathering process determined by different element chemical mobility, forming minerals resistance, weathering intensity and jointing process.

ANALISIS FAKTOR GESEKAN PADA PIPA LURUS DENGAN VARIASI DEBIT ALIRAN Subagyo, Rachmat
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 3 No 2 Februari 2011
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Distribution of laminar or turbulent flow is strongly influenced by the Reynolds number, Viscosity, pressure gradient and surface roughness. High coefficient of friction affect directly to a substantial reduction in pressure and eventually to the energy needed to push the fluid. Because of the role of the coefficient of friction is very important in the flow, so study has been conducted on the straight pipe, and friction factor with the variation of flow rate, by measuring pressure at two particular points to determine the loss. From the experimental results it can be concluded that the friction factor will be smaller in value with increasing Reynolds number and with the increase of Re, the friction factor value will be more stable. In the first experiment the highest friction factor occurs at Re = 4,30 x 104 with a value of f = 2,195 x 10-2 for the second experiment at Re = 1,41 x 104 with a value of f = 2,462 x 10-2 and the third experiment at Re = 2,39 x 104 with a value of f = 2,461 x 10-2. And for the lowest value occurred at Re = 1,91 x 105 with a value of f = 1,513 x 10-2, Re = 1,86 x 105 with a value of f = 1,521 x 10-2 and Re = 1,75 x 105 with a value of f = 1,544 x 10-2. At Re numbers began to 1,50 x 104 - 2 x 104 value of the friction factor tends to be stable (unchanged). The difference calculation from the experimental to the theoretical friction factor is 1,37% and to the moody diagram is = 1,14%.

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