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<![CDATA[SPEKTRUM BUNYI ALAT MUSIK KENTONG BERDASARKAN VARIASI JUMLAH LUBANG ]]>
<![CDATA[Sarah, Siti]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v7i2.202
<![CDATA[The goal of this research are knowing sound spectrum by kentong; and knowing correlation between the amount of kentong’s hole and sound frequency. The sound is recorded in quite situation with computer which instaled by sound software. Then, the recording sound is analysed the frequency pattern in prominent and harmonic frequency. As a result, the frequency pattern of kentong with one hole formed in prominent frequency. The frequency pattern of kentong with two holes formed in prominent, first harmonic, and second harmonic frequency. The frequency pattern of kentong with three holes formed as same as kentong with two holes. The frequency pattern of kentong with four holes formed until the fiveth harmonic frequency. There is corelation between sound frequency and the amount of kentong with formula y = -86,125x2 + 515,34x + 57,375 dan determinant value = 0,9779.]]>
<![CDATA[PEMBANGKIT LISTRIK ENERGI MATAHARI SEBAGAI PENGGERAK POMPA AIR DENGAN MENGGUNAKAN SOLAR CELL ]]>
<![CDATA[-, Subandi]]>;
<![CDATA[Hani, Slamet]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v7i2.203
<![CDATA[This paper discusses the application of solar cells as an electric power source and the electricity generated is used to a drive water pump. The working principle of solar power plants is the conversion of energy contained in to electricity. When these photons strike the surface of the solar cell electrons will be excited and generate electric voltage. Electricity generated from the solar cell is direct current (DC) to charge a battery, which in turn is converted into alternating current (AC) using an inverter. The testing stage carried out in the field is to find the to main parameters whichare the voltage and amperage. Battery is charged by the solar cell to accumulate the solar energy into electrical energy. The produced solar cell voltage ranges from 14.8 to 17.5 volts DC. The Solar cells used are of panel type polycrystalline (poly-crystalline) with a power of 50 wp. Current and voltage of the solar cell source varies depending on the incident sunlight power the cell voltage is ± 17V, but charging the battery the average voltage is 13,5V which is secured by the solar charger controller. Voltage and current will begin to rise in the morning at 07.00 am, then reach the maximum level during the day at 10:00 a.m to 13:00 p.m, and begin to fall in the afternoon.]]>
<![CDATA[PENGARUH PENGELASAN FCAW TANPA DAN DENGAN PENAMBAHAN PANAS TERHADAP PERUBAHAN SIFAT MEKANIK DAN STRUKTUR MIKRO SAMBUNGAN LAS ]]>
<![CDATA[Subeki, Nur]]>;
<![CDATA[-, Jamasri]]>;
<![CDATA[Ilman, M.N.]]>;
<![CDATA[Iswanto, P.T.]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v7i2.204
<![CDATA[The Welding processes are delivery used joining steel, especially used in civil construction, piping and ship manufacturing. Many of the benefits that can be obtained from welded joint is the joining can be cheap, rapid manufacturing, varied shape and lighter construction. One of the welding techniques that is widely used for joining the steel construction is Flux Core Arc Welding (FCAW). The problem that found in welding joints is the tensile strength in welding area is low and uneven hardness in the weld joint. The aim of this research was to determine the mechanical properties of FCAW Welding process and find out micro structures formed by the addition of heat around the welding.In this research, FCAW welding has been divided into two groups; the ones group is manufacturing without addition of heating, and the second group is manufacturing by heating 200 °C. Every group of manufactures would be test by chemical compositions, macro photos, micro photos, tensile strength and hardness number. The results of this research shows that the addition of heat at 200 °C could be increase the yield strength and ultimate strength. The heating also could be very small impact on the change in the hardness of weld area, but it could be reduce the hardness in HAZ area significantly. Micro structure formed then the weld area has been dominated by acicular ferrite micro structure, grain boundary ferrite dominate in coarse HAZ, the pearlite and ferrite with grain aggrandizement take place in smooth HAZ and base metals.]]>
<![CDATA[UNJUK KERJA ALAT PENGERING GULA SEMUT DUA BELAS SUSUN MENGGUNAKAN BAHAN BAKAR LPG ]]>
<![CDATA[Johanes, Susanto]]>;
<![CDATA[G., Sukartono,]]>;
<![CDATA[S., Soeadgihardo]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v7i2.205
<![CDATA[Modified dryer is used as an alternative methodfor drying the production of coconut sugars (gula semut / gula merah) or coconutcrystal sugars for farmers or micro entrepreneurs, especially when production is increased or in the rainyseason. This study aims to determine the performance of drier gula semut own design, with LPG fuel. Construction drier consists of a framework to support stainless steel pans as the container of sugars, measuring 78 cm x 74 cm x 4 cm, which is composed of twelve level, with a gap distance of 5 cm. The pans arranged vertically, so that the bottom of the pan gets hot either by radiation, conduction, and convection by the flow of hot air that is exhaled by the blower, while the pans that is above it also will get heat by conduction and convection by hot air which flows through it. The tests of dryers are conducted in two methods: with load and without load. The weather conditions are dry bulb temperature of 30°C and 27°C wet bulb. In the no-loaded testing, to achieve a working temperature of the drying chamber at 60 °C, it takes approximately 40 minutes. While testing with load is drying 8 kg / pan and 10 kg / pan sugars. On this burden, to reduce the water content of about 6% to between 2-3%, required 5.5-7 hoursdrying time, and required the consumption of fuel (LPG) between 1.15 to 1.35 kg. The rate of the average water content decreasedis 0.66% per hour, and the total efficiency of the dryer (ηT) is 23%.]]>
<![CDATA[KAJIAN KERENTANAN MASYARAKAT DALAM PENGELOLAAN DARATAN WILAYAH PESISIR KOTA KUPANG TERHADAP ANCAMAN GELOMBANG TINGGI ]]>
<![CDATA[Wibowo, Tri U.]]>;
<![CDATA[Kotta, Herry Z.]]>;
<![CDATA[Effendi, Jauhari]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v7i2.206
<![CDATA[Kupang City is the capital of East Nusa Tenggara Province located in Kupang Bay, based on historical data has encountered several of the earthquake that caused high tide. This study aims to obtain vulnerability of coastal society in land management of Kupang City coastal through those natural disasters, this study covers 15 villages located along the coast of Kupang City. Determination of the vulnerability using spatial analysis with GIS software Quantum Valmiera 2.2 and ArcGIS 9.3 , descriptive statistics, scoring systems and weighting limitation vulnerable areas under 10.5 meters above sea level, which is an overlay be physical vulnerability map. Physical vulnerability variable such as structured area, and the density of buildings.Non-physical vulnerability variable such economic area parameters, livelihoods, and population density. Environmental vulnerability variable parameters such as elevation, distance from the shoreline and coastal protection forest .There are three levels of vulnerability; high, medium, and low. From the resulting overlay of each variable and parameters obtained the vulnerability of coastal areas in Kupang City was dominated by the 9 villages with medium vulnerability, 1 village with high vulnerability, and there are no villages in the low vulnerability. 5 villages are safe from high tides.]]>
<![CDATA[SISTEM DETEKTOR ARAH SINYAL RF MENGGUNAKAN ANTENA DOPPLER ]]>
<![CDATA[Kristiyana, Samuel]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v7i2.207
<![CDATA[Two-Way Communication technology uses electromagnetic waves growing very rapidly. Various areas of public life, military and emergency purposes using the radio frequency spectrum, which would be very helpful. This communication system weakness, can not be used to emit a frequency along the same Waku. When this happens as a result of communication will be closed (jammed) for crowded frequency sometimes even no intent to disrupt a lot happening in the field of communication such as radio amateur frequencies. Directional Finder conventional radio has served for many years used to look for the direct nuisance frequency transmitter that has now been inefficient in terms of time and operations. Doppler system applications with Adaptive systems can be used as the basis for the work of Radio Stand Finder to detect the direction of the position of the RF transmitter without direct mobility. Roanoke Doppler antenna designed with a system of switching and amplifier signal reception by the arrangement of square-4 half-wavelength antenna that can determine the direction of the RF signal. Adaptive system can help lock the receiver system information is based on strong towards the greatest signal intensity.]]>
<![CDATA[METODE ALTERNATIP PEMBELAJARAN MATEMATIKA GEOMETRI RUANG PADA TINGKAT SEKOLAH DASAR MELALUI PONSEL BERBASIS ANDROID ]]>
<![CDATA[-, Uminingsih]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v7i2.208
<![CDATA[Learning methods have an important role to the success of student understanding of the learning material presented. In learning methods it is required media in the form of learning applications that can be used to deliver learning materials. Learning applications can use smart mobile phones (HP) to ease and interest the learning process so that the learning objectives ca be achieved. With the launch of Android HP technology where day today, increasingly relatively cheap price so that many people can reach them, including for their children . One of the features that android open source and open-platform does not depend on the manufacturing / certain vendors so it can be used in a wide variety of vendors. Therefore, in this study Android HP was utilized to provide a learning material in space geometry of mathematics that teach how to calculate the volume and area by applying the certain equations for various shapes . The trick is to embed an application program that has been made into HP. With the success of making the media application it is expected to help elementary school students to be more pleasure and easier to memorize mathematic formulas of the learning materials. By using this media through HP, students can learn anywhere, anytime and in any atmosphere.]]>
<![CDATA[THE EFFECT OF PH VARIATIONS ON MAGNETIC PROPERTIES OF MAGNETITE SYNTHESIZED FROM IRON SAND ]]>
<![CDATA[Wildan, Muhammad Waziz]]>;
<![CDATA[Rusianto, Toto]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v7i2.209
<![CDATA[Magnetite has been successfully synthesized from iron sand using co-precipitation method with variations of pH levels. The iron sand was obtained from South Coast of Yogyakarta. The iron sand was separated using a permanent magnetic bar to obtain the magnetic mineral, which is used as raw material. The raw material was ball milled to reduce the particle size down to ≤ 74 mm. It was then dissolved and stirred in HCl 37% at 80 oC for 3 hours. The reaction yielded a solution consisting of FeCl2 and FeCl3, which is called as a master solution. Ammonium hydroxide (NH4OH) 20% was added to the master solution to obtain Fe-oxide precipitation. The precipitation process depended on the pH of the solution, so the pH of the solution was arranged using variations of NH4OH contents. The volume ratios of the master solution and NH4OH were A (2:1), B (1:1), C (1:2) and D (1:3), they were designated as samples A, B, C and D, respectively. Those various compositions yielded solutions with various pH levels, i.e. 5, 8, 10 and 11, respectively. The black powder precipitation was immediately formed during the reaction. The powders were analyzed using XRD. The magnetic properties were measured using vibrating sample magnetometer (VSM). TEM was used to observe the particle size. From the XRD, it was found that magnetite compound was found on the solution with pH level ≥ 8. Magnetic properties test show that Ms (saturation magnetization) is 43 emu/gr found on the solution with pH level of 8. TEM images show that the smallest particle size found on the solution B with pH level of 8. Magnetic Nanoparticles (MNPs) with superparamagnetic properties can be synthesized from iron sand.]]>
<![CDATA[Studi Eksperimen Unjuk-Kerja Modulasi DBPSK pada Platform Software-Defined Radio (SDR) ]]>
<![CDATA[Marpanaji, Eko]]>;
<![CDATA[Trilaksono, Bambang Riyanto]]>;
<![CDATA[Langi, Armein ZR]]>;
<![CDATA[Kurniawan, Adit]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v1i1.373
<![CDATA[This paper addresses Differential Binary Phase Shift Keying (DBPSK) modulation implemented on SDR platform for the development of digital data communications based on SDR. DBPSK modulation performance perceived at Packet Error Rate (PER) is evaluated in terms of Eb/No or S/N ratio, carrier frequency, bit rate, gain, roll-off factor of root Nyquist filter or root raised cosine filter, and of size of payload from delivered data. Based on this results, the smallest PER could be obtained by setting Eb/No value which is greater than 13 dB, carrier frequency of at least 0,3 MHz, optimum bit rate of 256 kbps, optimum range payload size of 2000 up to 4000 bytes, and roll-off factor of Nyquist or root-raised cosine filter of 0.1<alfa<0.9.]]>
<![CDATA[MODULUS ELASTISITAS DAN MODULUS PECAH PAPAN PARTIKEL SEKAM PADI ]]>
<![CDATA[Arbintarso, Ellyawan Setyo]]>;
<![CDATA[Wibowo, Hary]]>
<![CDATA[ JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008 ]]>
Publisher : <![CDATA[Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta ]]>
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DOI: 10.34151/technoscientia.v1i1.374
<![CDATA[Rice husk particle board was expected to replace the established one, because it has advantages such as more heat and fire resistance that can be used in household appliances, building material, heat absorber, and cold storage. As an alternative building material, rice husk particle board should pass the testing processes that suitable to industrial standard include physical and mechanical properties. Particle board was made of resin and rice husk at 1:2 and 1:3 composition mixture and compacted ratio at 2:1, 3:1, 4:1 and 5:1 respectively used moulding that have a measurement 20 x 10 cm2. The testing included internal bonding, modulus of elasticity (MOE), modulus of rupture (MOR) and density of particle board. The results have shown that composition mixture 1:2 has more strength than 1:3. The highest compacted ratio needed more compacted pressure, i.e. on compacted ratio 5:1 has needed pressure 10.795 kg/cm2. Internal bonding of composition mixture of 1:2 has higher than 1:3. The highest value of MOE and MOR have received in 1:2 composition mixture with 5:1 compacted pressure are 5,088.75 kg/cm2 and 63.75 kg/cm2 respectively. The MOE on composition mixture of 1:2 has higher than 1:3. A particle board density ranges from 0.355 g/cm3 on 1:2 composition mixtures with 2:1 compacted pressure to 8.73 g/cm3 with 5:1 compacted pressure. The best of rice husk particle board used 1:2 composition mixture and compacted pressure of 5:1 which result in highest of MOE and MOR values.]]>
