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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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PENGUJIAN KINERJA MESIN DAN EMISI GAS BUANG MESIN DIESEL BERBAHAN BAKAR EMULSI PADA BERBAGAI TEKANAN INJEKSI Mangalla, Lukas Kano; Suardjaja, I Made
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v1i2.398

The aim of this research is to examine the effect of increasing injection pressure on engine performance and exhaust emission of emulsified fueled diesel engine. The diesel exhaust emission such as Nitrogen Oxide (NOx), Carbon Monoxide (CO), Unburned Hydrocarbon (HC) and Soot can be controlled through complete combustion and lower peak combustion temperature. This phenomenon occurred by utilizing fuel-water emulsion at high injection pressure to obtain a good atomization and perfect mixing of fuel-air in combustion chamber. The engine employed in this research was four stroke single cylinder diesel engine, with bore of 75 mm and stroke 80 mm. Engine was operated at vary throttle position from 20%, 40%, 60%, 80% and 100%. At each throttle position rpm, load, fuel consumption, inlet pressure, exhaust temperature, carbon monoxide, unburned hydrocarbon and opacity were measured. CO-HC emissions are measured by Mexa 321E and opacity by LDR tester. The injection pressure of fuel was varied at 145, 170 and 195 kg/cm2. The concentration of water in emulsion fuel was varied of 0%, 10%, 20% and 30%W/O. ABS (Alkyl benzene Sulfonate) was used as emulsifier of water and diesel fuel with 0,22% volume. The result of the research show that torque and power of diesel engine were relatively constant with increasing injection pressure but emission of CO, HC and opacity reduced significantly. Increasing of injection pressure from 145 to 195 kg/cm2 resulted in reducing emission of CO, HC and opacity by 73 %, 60 % and 26.4 % respect-tively at wide-open-throttle.

ANALISIS PENENTUAN KONFIGURASI JARINGAN DISTRIBUSI TERBAIK ANTARA WAREHOUSE DAN DEMAND REGION DENGAN MENGGUNAKAN MODEL BI-CRITERIA Yusuf, Muhammad; Sodikin, Imam
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Determining the best level of aggregation in a centralized supply chain is one of the most difficult problems because of the conflicting objectives and demand uncertainty. PT. Nampar Nos is one of leading drinking water company with various range market in some regions in Flores, even in some islands in East of Nusa Tenggara. Itâ€™s width service area and demand uncertainty. Causes the company has a good decision to decide where the warehouse should be located, and how much the optimal number of warehouses to satisfy the demand. This research uses bi-criteria model to determine the best distribution network between Warehouse and Demand Region. There are two steps in data process-ing that will be done. The first step is to determine the cost that relation with the old distri-bution network in Flores use Gaur and Ravindran model and the second step is to de-velop the new alternative use trial and error method and then calculate the total cost and also responsiveness. After the solver output, we get the best one configuration from 2 alternative configuration distribution network that is developed. Alternative 1 is the best configuration network amount warehouse and demand region which is yield in decreasing total cost per month about Rp 49.996.000 or 11% from level Rp 417.280.400 to Rp 367.284.400. And also decreasing product miles about 7.500 or 5% from 153.500 become 146.000.

REDUKSI DERAU DENGAN MENGGUNAKAN TAPIS ADAPTIF Kristiyana, Samuel
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

In signal processing, often contaminated by other signal that has bad influence or called by noise. Noise will lose by using adaptive filter with predict method. This filter needs two inputs that are contaminated signal with delayed input as main input which use as training input and the other contaminated signal with input as reference input, so result of error is the success process of reduction noise. This filter use LMS filter of algorithm value variable with adapted process filter. Adaptive filter with predict method tested by noise signal. This filter tested by kind of variable value and Î¼. So, we will get a point of value, total of optimal value and also the Î¼ optimal value.

BIOSTRATIGRAFI DAN BIODATUM FORAMINIFERA PLANKTONIK SUMUR-95 DI DAERAH CEPU KABUPTEN BLORA JAWA TENGAH Sanyoto, Siwi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Planktonic foraminiferals are used to identify locally, regionally and inter-regio-nally stratigraphic correlation. Due to stratigraphic correlation, using fossil is further applied in base on a number of biodatums. Based on planktonic foraminiferal analyses, within sixty-eight rock samples which were taken each 10 m for the interval, can be com-piled within three biodatums and one partially zone, i.e Globorotalia tosaensis tenuetheca biodatum, Glorotalia truncatulinuides truncatulinoides biodatum, and Globigerina calida calida biodatum; also partially zona of Globigerina calida-calida.

APLIKASI CENTRIFUGE TURNTABLE BERBASIS MIKROKONTROLER AT89C51 DENGAN PENAMPIL LCD GM2004 Hani, Slamet
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

A Centrifuge is one very important medical apparatus for separating some me-dical subtracts such as blood, urine, drugs for producing vaccines and antitoxins. Ba-sically this apparatus is centrifugal turntable equipped with a study turning mechanism and a set of tube holders to accommodate 4 up to 20 subtract sample tubes. The needed rotation controlling system was designed and constructed in steps. First, for the entire mechanical as well as electronic subsystem. Second, on the details of the electronic hardware and the connected mechanism. Third, the software needed to run the electronic hardware. Fourth, to load the controlling program into the AT89C51 microcontroller and finally the run test of the entire system. The result shows that this centrifuge regulator works sufficiently well to replace the original failing system.

SISTEM KUNCI ELEKTRONIS DENGAN PEREKAM WAKTU AKSES BERBASIS MIKROKONTROLER AT89C51 -, Subandi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The technology development nowadays, especially electronic technology has been reaching great strides. Every technology in almost any sector needs electronic device. As a door lock, now, can used electronic technology as its controller system. To make electronic key system has few steps. First, make planning to design electronic and mechanic system of the door lock. Second, design the hardware and drill PCB followed by assembly the electronic component. Third, design software by using algorithm from system. Fourth, flash the assembler program into the IC AT89C51 and set it to hardware, next test the completed system. Microcontroller system on that application connected to another interface like as ADC, DAC, LCD etc. The finishing from the system is checked. The result, this system can be applied to door lock system with time recording access. It uses Real Time Clock (RTC), Line Port Terminal (LPT), IC AT89C51 and hand phone Siemens M35i as the interface system.

ANALISIS DISTRIBUSI KERUSAKAN AKIBAT GEMPABUMI 27 MEI 2006 MELALUI PENDEKATAN KEGUNUNGAPIAN DI DAERAH WONOLELO DAN SEKITARNYA, KABUPATEN BANTUL, DAERAH ISTIMEWA YOGYAKARTA Mulyaningsih, Sri; Husadani, Y T; Devi, L R; Irawan, S N
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Northern Wonolelo area till Berbah was the areas with the most damaged generated by an earthquake of 27 May 2006. On the other hand, volcanic rocks within circular features characterize the areas. Palaeovolcanism had intensively deformed their lithology, generated normal faults and shear joints, in radial pattern with the axis of the vent. The earthquake force reactivated the existing faults and shears. Area with past central eruptions easier to deformed than the others. Volcanic-stratigraphy analyses found three periods of explosively volcanisms intersecting with composite volcanisms, created three escarpments separating each others. There fore, there were three zones of the most damaged areas according to the distributions of central eruptions; i.e Wonolelo and it vicinities, Sudimoro (Segoroyoso) and its vicinities, and Watuadeg-Senthong and its vicinities. Further subsurface research is necessary to verify the central of old volcano that caused the damages.

ANALISIS PERAWATAN ROBOT SPOT UNTUK MENGETAHUI KEANDALAN MESIN PRODUKSI DAN KETERSEDIAAN SPARE PART PADA DEPARTEMENT MAINTENANCE PT. ASTRA DAIHATSU MOTOR JAKARTA -, Suhartono
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 2 Februari 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Robot Spot is one of an important machine in production activities of vehicle as-sembly, for example PT. Astra Daihatsu Motor, Jakarta. During production activity, relying on machine is the most significant thing that should be preserved, such as Robot Spot under Body four and Robot Spot Main Body seven. That is suggested; in order con-tinually maintenance could be performed effectively. Relying on of production machines and the willingness spare parts must be accounted to calculate their values of reliability factors, maintainability factors, availability factors and the spare part stocks. Those are approached by goodness of fit test analyses, to predict time and the damaged dis-tributions, life times and the costs of maintenance within the machines. Based on those analyses, both robot spot under body four and robot spot main body seven are having medium reliability with good condition, low rate of damage, and still accurate to be opera-ted. However, it is still necessary to overhaul those machines, so that new machines are not required.

PERAMALAN KAPASITAS BATERAI PADA KENDARAAN LISTRIK DENGAN METODA COULOMETRI Kaloko, Bambang Sri
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

This article proposes a new coulometric approach to calculate the state of charge of a lead acid battery in electric vehicles. The main existing state of charge algorithms have two major defects: a state of charge definition not adapted to electric vehicle ap-plications and the nonoptimal use of static performance of the accumulator to estimate its state under dynamic stresses. In order to improve these two weaknesses, we propose a new coulometric algorithm linked to the performance of the electric vehicle and where the ampere hours virtually discharged are obtained by applying statistical equivalence coefficients to the real current profile. The evaluation of this new algorithm on real dis-charges reveals a significant improvement with less than 5% errors in all cases studied.

PENINGKATAN EFEKTIVITAS PENYAJIAN SEARCH RESULT DARI SISTEM TEMU KEMBALI INFORMASI MENGGUNAKAN CLUSTERING DOKUMEN Hamzah, Amir
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The fast expansion of text information volume has caused the difficulty of infor-mation retrieval process, mainly on the model of word-based matching. The synonymy factor of word has caused non relevant document to be retrieved, whereas the polisemy factor has caused relevant document not to be retrieved. The application of document clustering to the search results before presented to the user can increase the effect-tiveness of retrieval. This study elaborates the application of document clustering to im-prove the effectiveness of retrieval by clustering to the search result before presented to the user. Three clustering algorithms from partitional approach i.e. K-Means, Bisecting K-Mean and Buckshot, and hierarchical agglomerative approach with two cluster similarity function i.e. UPGMA and Complete Link were chosen. The performance parameter was measured using F-measure, a metric derived from Precision and Recall of retrieval. The document collections to be tested are 1000 news document and 350 academic abstract documents. The results show that the presentation of search results by using clustering has improved the number of relevant document in the up-level ranks. The improvement was statistically significant compare to the page-rank method. The improvement of F-measure as a performance metric is about 14,34% for news documents and 28,18% for abstract documents.

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