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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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PENERAPAN METODE VERY LOW FREQUENCY (VLF) PADA LOKASI ANOMALI GEOMAGNETIK RENDAH Kanata, Bulkis; Zubaidah, Teti; Susanto, Oki Prio
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 02 Februari 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The research with title Evaluation of measurement result of geomagnetic anomaly in lombok island, west nusa tenggara and analysis of itâ€™s relation with gravitation anomaly and prediction of local geology (Zubaidah, 2005) in area about 25 x 30 km2 result a isogam map, which known that the minimum geomagnetic anomaly equal to 558,194413 nT located in Seganteng, West Lombok (08035â€™46,2â€ LS, 116008â€™10,9â€ BT).Very Low Frequency Method is one of Geophysics methods that use magnetic com-ponent of electromagnetics field wich is caused by radio broadcaster use Frequency 15-30 kHz. VLF Method applied to know characteristic around the minimum geomagnetic anomaly in the form result of current density image which able to show conductive or itâ€™s not an measurement area.This VLF Acquisition conducted to know the zona of conductive layer as long as 2500 metres from south to north pass the minimum geomagnetic anomaly. The tilt data processing is done use Moving Average method and Linear filter with use Matlab 6.1 . The Result of data processing show the contour of current density with depth/space = 8 or maximum deep is 160 metres with conductive area is spread near the minimum geomagnetic anomaly which is estimated much water

FASIES DAN DIAGENESA FORMASI GAMPING-WUNGKAL DI DAERAH BAYAT, KLATEN JAWA TENGAH Mulyadi, Dedi; Siregar, M. Safei; -, Praptisih
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 02 Februari 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

The limestone of Wungkal Formation is the old tertiary sedimentary rocks existing between the metamorphic rock in Bayat complex, Klaten, Central Java.A thin section analysis was conducted on the limestone samples resulted in two facieses of carbonates, the foraminifera packstone and the foram-algal packstone. The diagenesis process includes microbal micritisation, cementation, dissolution and com-pacttion. Diagenesis occurred from marine environment, fresh water and burial. The for-mation of the Wungkal formation limestone took place during the mid Eocene to late Eo-cene at the basin slope of the shallow to slightly deep marine environment.

PERANCANGAN PERANGKAT LUNAK UNTUK PENGENALAN KARAKTER ASCII DARI GAMBAR BITMAP MENGGUNAKAN JARINGAN SARAF TIRUAN METODE PROPAGASI BALIK Utami, Ema; Hartati, Sri
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 02 Februari 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

ANN is a method in soft computing that imitate the structure of biological nervous, where multiple nodes communicate with each other through synapses that interconnect them. That method can be utilized for pattern recognition processes, such as ASCI Icharacter recognition.This paper is aimed to develop ASCII character recognition using ANN method. Multilayer neural network is adopted in ANN with back propagation algorithm. A mapping method is used for preprocessing to segment a character image to be processed by ANN.The experimental results show that among all of successful segmented characters of all the training data having the different size of font, the system successfully recognizes characters up to 81.74 %. For the training data with different sizes and fonts data, the system recognizes the characters with an accuracy close to 55.74%. Among the unsuccessful segmented characters of all training data having different sizes of font, the system recognizes characters with an accuracy 67.53%. For the different sizes and fonts data, the system recognizes the characters with an accuracy close to 46.65%.

TINJAUAN PENGARUH DIAMETER BUTIRAN TANAH TERHADAP NILAI KOHESI, C DAN SUDUT GESER DALAM, ïª Afriani, Lusmeilia
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 02 Februari 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Research about the influence of soil grain size to the value of cohesion c and internal shear angle j has been done by using direct shear test apparatus. The size of this instrument is a large box 500 x 500 x 300 mm. The soil sample for this research took from Criquebeuf-sur-Seine, Seine Maritime, North French. The soil grain size are 0/25 mm, 0/50 mm and 0/80 mm and it is classified as the coarse sol type. These results were then compared with that it uses sand sample from Fountainebleau, France. This research was done in the Regional Laboratorium of Street and Bridge in Rouen. Until now, research in the coarse grain soil are very rare due to the lack of instrument and facilities. The result indicates an important things where the grain size of soil will influences the cohesion value c, and the internal shear angle j. These values can be obtained from Mohr-Coulomb curve.

PENGARUH NILAI VARIANS DAN STEP SIZE TERHADAP MEAN SQUARE DEVIATION PADA LEAST MEAN SQUARE FILTER ADAPTIF Pagiling, Luther
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 02 Februari 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Variant value and step size effect of an adaptive filter are required to know how system to work, how fast the reachable system stability and how big adaptive filter can be able to eliminate the noise. At LMS adaptive, all of variants value stability systems reached and assess variant of input influence mean square deviation (MSD) con-vergence.Stability of system reached at value of step size, correlation matrix ( R ), and to the number of certain element weight vector. Normalization data convergence by MSD is compared to bigger of linear error convergence from MSD, that way the things of compared to bigger MSD simulation convergence of MSD Theory. MSD Convergence compare diametrical with input variant value and assess step size.

PENGENALAN POLA SINYAL SEISMIK GUNUNG MERAPI DENGAN ALIHRAGAMGELOMBANG-SINGKAT Saragih, Riko Arlando
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 02 Februari 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

In most communication systems, speech was transmitted in narrowband frequency, mainly at frequency 300 Hz to 3400 Hz. Therefore, the frequencies outside this narrow bandwidth were lost. The lost frequencies can cause bias articulation in some speech.Bandwidth expansion is one technique to overcome this problem. Many bandwidth expansion techniques have been developed to increase the speech signal bandwidth on communication channels through envelope aliasing, nonlinear processing, and linear mo-del of human speech processing. Artificial Bandwidth Expansion (ABE) is one of the bandwidth expansion techniques to increase speech signal sampling frequency (upsampling) from 8 kHz to 16 kHz. The process annexes extra spectral components which are the images of the low frequency spectral components (narrowband) in the higher frequency segment. This method works frame by frame and each frame is 30 ms long and 5 ms overlapping with the adjacent frames. In this research, every frame was classified using Hidden Markov Model (HMM) and stated as sibilants or fricative consonants or stop consonants and treated separately (attenuated or amplified) according to the classification results.Comparison tests were done in this research based on the audio perceptions of so-me responders. Based on the results, it was acknowledged that the quality of the speech signal was significantly improved although some distortions were somewhat object-ttionable.

PENGENALAN POLA SINYAL SEISMIK GUNUNG MERAPI DENGAN ALIHRAGAM GELOMBANG-SINGKAT Novianta, Muhammad Andang
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 02 Februari 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Seismogram data from the monitoring representative the raw file in contain vario-us each information about circumstance perceived. The wavelet transform is methode can by us for indicating data and operator function in the different frequency element. Pattern recognition process seismic signal using wavelet transform have the higher level efficacy opportunity. By the wavelet enable time-frequency location. Thresholding method to limit and eliminate some part on the signal which are not important. By determining value of data parameter, the parts of limited the can be considered by a mixed noise.

MENGGALI POTENSI ALIRAN AIR SUNGAI SEBAGAI SUMBER TENAGA PEMBANGKIT LISTRIK MIKROHIDRO; STUDI KASUS : SUNGAI KALI MANGGIS DI WILAYAH MAGELANG Nisworo, Sapto; Setyowati, Endang
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 02 Februari 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

People are becoming more dependent on electric energy in their daily life. Waterfall is one potential primary source of energy. Kali Manggis river has to potential for a PLTM (Pembangkit Listrik Tenaga Mikrohidro) system used waterfall method. The research was to explore this potential quantitatively.This research used positivistic method with a hypothesis that Kali Manggis river is good potential of energy. Discharge of water and the height of waterfall were measured and the analysis of data will give quantity energy.The findings show that Kali Manggis river was a lot of power for electric energy. The electrical energy force in the Kali Manggis river was 1.503,8222179 kwh.

VOLKANISME DAN KEPUNAHAN MANUSIA PURBA DI KOMPLEK GUNUNG PATIAYAM, DESA JEKULO, KECAMATAN KUDUS, JAWA TENGAH Mulyaningsih, S.; Bronto, S.; Kusnaedi, A.; Simon, I.; Prasetyanto, I. W.
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 02 Februari 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Geomorphologically, Mount Patiayam is a dome. The dome is characterized by varrying in strike-dips, the dipping layers of the southern part is to south, the eastern part is to east, the northern part is to north and the western part is to west. The summit of the dome is composed of igneous rock of pyroxenic basalt, while fluvial deposits and shale are composing of flanks up to foot of the dome. Based on the composing rocks, there were volcanism processes within Mount Patiayam. The interpretation was also supported by Landsat image that showed depression-shapes in caldera rings-like.Furthermore, Pleistocene sediments contain vertebrate and hominid (Homo erectus) fossils that are exposed at Patiayam region. Those fossils occur within cross bedding structure of pumiceous breccia, fine up to very coarse tuffs, and clay tuffs.

PEMBUATAN DAN KARAKTERISASI BIODIESEL DARI MINYAK BUNGA MATAHARI DAN METANOL DENGAN KATALIS NaOH -, Sukamta; Endriyani, Sunarti; Anita, Fitri
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 12 No 02 Februari 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Biodiesel is fuel made of seed oil and has potential to be used as substitute of crude oil. In this experimental work, it was used sun flower seed oil as a raw material of biodiesel.The aims of the research were to study a transesterification reaction of trigli-seryde of a sun flower seed oil and methanol and to attain the optimum conditions of the process to produce good quality of biodiesel. This research were done by mixing sun flower seed oil, methanol and catalyst with oil and methanol volume ratios were 1: 6 and 1:9 respectively. The ester produced were then characterised. The experiments resultant showed that the best quality of biodiesel were attained when the volume ratio between oil and methanol was 1:6 at temperature of reaction of 50oC and time of reaction of 90 minute. The characteristic of the oil produced were specific gravity 60/60 Â°F = 0,8846 ; viscosity kinematic = 4,562 cSt; pour point = 25,7Â°F ; flash point = 115 Â°F, and conversion of 32,42%. This characteristic in the range of the standard of biodiesel based on the letter of Ketua Badan Standarisasi Nasional No.04 â€“ 7182 â€“ 2006 about biodiesel.

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