bluuebunny/crossref_metadata_2025 huggingface dataset:
Green Synthesis of Carbon Nanotubes from Coconut Shell Waste for the Adsorption of Pb(II) Ions
Authors: Hakim Yusuf Zaim , Yulizar Yoki , Nurcahyo Adi , Surya Magun
Published: January 2018

Numerous complex methods have been developed for the preparation of carbon nanotubes (CNT) such as laser vaporization, arc discharge, pyrolysis, and chemical vapour deposition (CVD). In this study, an environmentally friendly and convenient method called one-step water assisted (quenching) synthesis method was conducted from graphite flakes, which were taken from coconut shell wastes to produce carbon nanotubes. Chemical and physical structure of the carbon nanotubes were characterized by FTIR (Fourier Transform Infrared), Scanning Electron Microscope (SEM), and Transmission Electron Microscopy (TEM). Adsorption performance of heavy metals Pb(II) ions by CNTs has been evaluated using the stirring method, and the concentration of Pb(II) ions has been determined using Atomic Absorption Spectroscopy (AAS). The adsorption conditions such as pH and contact time have been obtained. The results showed that carbon nanotubes were a bit successfully formed, in which the tubes distribution are scattered irregularly. The average tube diameter was 123 nm.  During the adsorption test, it was found that the adsorption was proportional to the contact time, in which the optimum contact time was 20 minutes. The optimum pH of Pb(II) ions absorption was 5 where the potential for Pb(II) ions absorption was 120 %. The results indicate the true potential of this green chemistry based method, and it opens the chance for possibility to produce carbon nanotubes at a larger scale.
PERBANDINGAN KONDUKTIVITASTEMBAGA, BAJA DAN ALUMINIUM
Authors: Mulyanto Arif
Published: January 2018

The heat transfer is important in engineering field and aspects of the life. Many equipment was made by using principles of the heat transfer, like: the oven, iron, the car machine, the muffler, the room cooler et cetera. The principle of the work in the research, there was the heat source at the upper side and the sink (heat remover) at the bottom side so that the temperature different ( was significant) along metal that was tested. The heat source from the electric heater,the object the test togethered with his heater all was isolated. The test object consisted aluminum with 20 mm2 cross section area, the steel and copper have 10 mm2 cross section area. The results that that the conductivity of copper was biggest were followed with aluminum and finally the steel.
ANALISA KEKUATAN BENDING KOMPOSIT EPOXY DENGAN PENGUATAN SERAT NILON
Authors: Sari Nasmi Herlina , Sinarep S.
Published: January 2018

The development of composite materials in the field of engineering is increasingly being used. This is because of its properties are superior compared to conventional materials, as the ratio between strength and density are quite high, stiff, the manufacturing process is very simple and resistant to corrosion and fatigue loads. The purpose of this study was to determine the effect the addition of nylon fibers with Epoxy Matrix on the increase in bending strength of epoxy composites.  The objected of this study was the composite of nylon fiber, which is cut 12 mm nylon fiber with epoxy resin as a fastening material. Before performing an experiment testing the tensile fibers has done and known to the stress of 461.22 MPa. There are 3 variations of volume fraction In this experiment, those are volume fraction of 40%, 50%  and  60%, with 3 variation each.  Method in the manufacture of specimens with the way the mould press. Tools to test the specimen is bending test machine (servopulser). Specimens using a standard test of ASTM C 393-94. Bending test results showed that the nylon fiber composite with fiber volume fraction 40% stress of 787.16 MPa, modulus of elasticity of 1.06 GPa, volume fraction of 50% the stress of 902.01 MPa, modulus of elasticity of 1.08 GPa, and for 60% volume fraction of the stress of 950.02 MPa, modulus of elasticity of 0.99 GPa.
Pengaruh Perlakuan Shot Peening Terhadap Korosi Retak Tegang Baja Karbon Rendah Pada Lingkungan Korosif
Authors: Sujita S.
Published: January 2018

The aim of this study is to investigate the effect of shot peening on stress corrosion cracking of a low carbon steel in ocean water environment. The dimension of specimens were prepared in accordance with the ASTM G39. The hardness testing was carried out using microvickers with 0,25 kgf load in the longitudinal direction. The corrosion cracking test was immersed into artificial sea water for about 7 months. The test shows that the pitting corrosion is dominantly nucleated at the metal film interface. The biggest pitting corrosion was occurred under the static loading of 70 for the specimens unpeened. The presence of pitting corrosion promotes stress corrosion cracking. The cracking has a intergranular branched morphology which is typical for the chloride cracking of low carbon steel
ANALISIS EKSPERIMEN LAJU ALIRAN VOLUME AIR TERHADAP TEMPERATUR AIR PANAS PADA HEAT RECOVERY SISTEM AC JENIS WATER CHILLER
Authors: Rasta I Made
Published: January 2018

Refrigerant in refrigeration machines will absorb heat from a room space and released the heat to the environment. The heat balancing in the system is heat released from condenser equal with heat absorbed from room space added by the heat equivalent from compressor work. Based on this heat cycle, the writer try to conduct research on using this heat rejection from condenser to heating tap water, focusing on water flow rate increased from 0.5 liter/min to 2.5 liter/min. From experiment and analysis result obtained that the maximum heat water temperature which can be reached is 47.5°C in 0.5 liter/min, with the equipment specifications are 2 HP- split air conditioning and the tank volume is 75 liters. The additional result is heating water temperature is fallen when the water flow rate is increased.
PENGARUH PANJANG SERAT DAN FRAKSI VOLUME TERHADAP KEKUATAN IMPACT DAN BENDING MATERIAL KOMPOSIT POLYESTER- FIBER GLASS DAN POLYESTER-PANDAN WANGI
Authors: Sulistyowati Emmy Dyah , Sari Nasmi Herlina , Yudhyadi IGNK , Sinarep S. , Topan T.
Published: January 2018

At this research by using two kinds of composite that is composite of fibre of screw pine of fragrant and composite of glass fibre. And in doing research will be done by two examination type that is test the strength bending and test the strength impact. How strength from two composite type of examinee with the long variation  and fibre volume to be used.As the result test the strength of impact and bending to be composite of screw pine of fragrant with the long variation of fibre with the random fibre direction that composite highest strength impact of fibre of screw pine of fragrant got at fibre length 5 cm of equal to 2286,67 singk / m². while for the variation  of volume of highest strength impact fibre there are at fibre volume 40% with the unidirectional fibre direction equal to 2940 Kj / m². While to result of composite strength bending test of screw pine of fragrant got by biggest strength bending with the long variation of fibre with the direction of fibre random, gotten at fibre length 5 cm of equal to 146,67 KN . while for the strength of bending with the variation of fibre volume with the unidirectional fibre direction, highest strength bending got at fibre volume 40% equal to 236,67 KN. Medium to result of composite strength impact test of glass fibre at long variation of highest strength fibre got at length seart 5 cm of equal to 5553,33 Kj / m². While strength impact with the variation of biggest strength fibre volume at fibre volume 40% with the unidirectional fibre direction equal to 15908,67 Kj / m². Medium at composite strength bending test of glass fibre with the long variation of fibre  where fibre direction is random of biggest kerkutan bending at fibre length 5 cm of equal to 263,33 KN. while to result of kekutan bending  at variation  of fibre volume got by biggest strength bending at fibre volume 40% equal to 278,34 KN.
Pengaruh Persentase Arang Tempurung Kemiri Terhadap Nilai Kalor Briket Campuran Biomassa Ampas Kelapa - Arang Tempurung Kemiri
Authors: Gde Gianyar Ida Bagus , Nurchayati Nurchayati , Padang Yesung Allo
Published: January 2018

Indonesia has many sources of renewable energy. One of the source  renewable energy in Indonesia is biomass, because the price of biomass is relatively cheap and so far abundant numbers. Coconut dregs and hazelnut shell are biomass where these can’t be utilized optimally. Biomass can be made into briquettes which is a fuel with high calorific value.            The method used in this study is an experimental method. Begining the process with manufacture of briquettes which is the drying process of coconut dregs and hazelnut shell using the sun until dry, then the process of composing hazelnut shell. Raw materials crushed and sieved, after that the raw material made into briquettes by varying the percentage composition of coconut dregs and charcoal hazelnut shell as follows 80% : 20%, 60% : 40%, 40% : 60%, 20% : 80%. Then, the briquettes are tested their calorific value and moisture content.            The results show that higher heating value (HHV) and lower heating value (LHV) are the highest in the mix of AK 20% : ATK 80% is equal to 34,517 kJ/gr (8.242,819 cal/gr) and 34,172 kJ/gr (8.160,523 cal/gr). Meanwhile the briquettes moisture content range between 2,474% - 3,186% with average of 2,836%. In term of calorific value and moisture content, biomass briquettes from coconut dregs and charcoal hazelnut shell meets the quality standards set by the standards of Indonesia, Britain, Japan and USA.
Study Kekuatan Bending Dan Struktur Mikro Komposit Polyethylene Yang Diperkuat Oleh Hybrid Serat Sisal Dan Karung Goni
Authors: Widiartha I Gede , Sari Nasmi Herlina , Sujita S.
Published: January 2018

AbstractThe purpose of this study is to investigate and study the mechanical properties of polyethylene strukrur micro hybrid composites reinforced by fibers sisal and jute sacks.Preparation of composites by hand lay-up method with a ratio of fiber volume fraction of sisal and jute sacks 30%: 0%, 20%: 10%, 15%: 15%, 10%: 20%, 0%: 30%. With unidirectional sisal fiber orientation and fiber length random burlap gunny sack fibers 2 cm. Specimen testing is performed with a standard bending test ASTM D790, and microstructure.Test results obtained from the average bending strength of composites with high fiber volume ratio fraksin 30%: 0% is 74.43 Mpa. While the lowest average for bending strength found in composites with fiber volume fraction of 0%: 30%, the bending strength of 32.21 MPa. Therefore we can conclude the increasing volume fraction of sisal fiber with unidirectional fiber orientation, the higher the bending strength of its appeal and reverse the growing volume of burlap fibers with random orientation of the fibers feeding the lower the bending strength and the strength.
PEMANFAATAN BIOGAS TERMURNIKAN BERBASIS METODE KALSINASI PADA KENDARAAN BERMOTOR
Authors: S Rudy , Maha Putra IGB Dipa , Mulyanto Arif
Published: January 2018

Biogas is one of the alternative energy sources that are environmentally friendly, inexpensive, easily available, renewable, and can be used as a substitute for gasoline for motor gasoline. For the use of biogas in the motor gasoline is necessary to improve the quality of biogas that is more optimal use of biogas when used as fuel.This study aims to determine the reduction of carbon dioxide (CO2) during the purification of biogas by using absorber Ca (OH)2 to the elevated levels of CH4 in biogas and its effect when testing the performance of the motor fuel, which indicate the performance of the motor fuel is the torque, power and effective specific Fuel Consumption effective. In this study, the biogas will be purified by varying the flow rate is var I (5 liters / min), var II (10 ltr / min) and var III (15 ltr / min), and biogas purification degan best quality results will be compared with biogas before purification by way of testing the motor performance in round 1500 rpm, 2500 rpm,3500rpm and 4500 rpm.The result showed that the purification of biogas menggunan Ca (OH)2 at a rate var II (10 ltr / min) produced the best biogas CH4 content of 91.0%, better than the variations I and III variations, and the results of performance testing of the motor fuel showed improvement menghasillkan better quality. Judging from rotation 4500 rpm for prior purification 5.9399 Nm torque, power and SFCe effective 2797.7079 W 0.000164 (kg / jam.W), whereas after purification 6.5821 Nm torque, effective power 3100.1628 W and SFCe 0.000113 (kg / jam.W)
PENGARUH KECEPATAN ANGIN DAN VARIASI JUMLAH SUDU TERHADAP UNJUK KERJA TURBIN ANGIN POROS HORIZONTAL
Authors: Aryanto Firman , Mara Made , Nuarsa Made
Published: January 2018

The wind turbine is a device that converts wind energy into mechanical energy and then converted into electrical energy through a generator. Horizontal axis wind turbines can increase the efficiency to get the maximum power coefficient. One was using the blade numerous. Maximum efisiensi system will increase the number of watts (power) generated so as to obtain a certain number of watts by simply using the number of windmills lessThe object of this research is the performance testing horizontal axis wind turbine with wind speed variation and variation in terms of the number of blade Efisiensi system (𝜂 )  and Tip Speed Ratio (TSR). Research conducted with the wind coming from the source to the Wind Tunnel fan to direct wind. Wind speed is used there are three variations of the 3 m/s, 3.5 m/s, and 4 m/s and varying the amount of blade that is 3, 4, 5 and 6 blade.The results showed that the best 𝜂  values obtained at a maximum wind speed of 4 m / s and the number of blade 5 with a value of 3.07% 𝜂, whereas 𝜂 smallest value obtained at wind speeds of 3 m/s and the number of blade 3 that the value of 0.05% 𝜂. For TSR maximum value at a maximum speed of 4 m/s occurred in the number of blade 5 is equal to λ = 2.11, while the lowest value at wind speeds of 3 m/s resulting in blade number 3 is equal to λ = 1.49.
PENINGKATAN EFISIENSI DAN EFEKTIVITAS OPERASIONAL NELAYAN PADA PANTAI YANG CURAM DENGAN ALAT PEMINDAH PERAHU
Authors: Tanaya IGNA , Suartika Made , Okariawan IDK
Published: January 2018

Indonesia is known as an archipelago that has abundant marine resources, this should make Indonesia a wealthy and prosperous country. Unfortunately, these resources cannot be fully utilized because there is still a lack of support for technology and human resources in an effort to explore the existing marine resources. It is no wonder then many coastal communities are middle to lower living standards. Most of the fishermen have to pay people to help the process of shifting their boat, especially the fishermen on the steep coast so that it can reduce their revenue.This research aims to improve the operational productivity of fishermen on the steep coast by using an alternative concept, so that it reduces human labor as shifting assistant in the traditional shifting. Three alternative concepts has been designed to assist those shifting process, ie Tripod, Boat Train, and Boat Wheel. The designs was then selected to obtain the best concept. Concept selection was using the matrix assessment Analitycal Hierarchy Process (AHP) by assistance of data processing using Expert Choise 11 program furthermore method followed by using Pugh method to compare the boat shifting process between alternative concept and traditional shifting.Concept selection gives certain point for each concept, Tripod 0.3044 point, Boat Train 0.3998 point, and Boat Wheel 0.4385 point. It shows that boat wheel design selected as the best alternative concept. The comparison of total productivity between the best alternative concept and traditional shifting is 2.32 to 1.66. It means boat shifting process by using alternative concept design can be increase productivity counting 28%.
ANALISA SISTEM DISTRIBUSI AIR PDAM DI DESA PEMONGKONG KEC. JEROWARU KAB. LOMBOK TIMUR
Authors: Helmi M. , Sutanto Rudy , Padang Yesung Allo
Published: January 2018

Dalam proses pendistribusian air bersih ke desa Pemongkong, sering terjadi kekurangan debit di beberapa dusun, sehingga pada penelitian ini akan dicari faktor apa saja yang menyebabkan debit aliran pada beberapa dusun sangat rendah.Secara umum kebutuhan masyarakat masih dapat terpenuhi. Hal ini dapat dilihat dari kebutuhan rata-rata (debit demand) harian berdasarkan SKAB DPU sebesar 9,96 L/s, sedangkan debit yang tersedia di sumber dari bulan Januari s/d Agustus 2012 lebih dari 9,96 L/s. Kemudian terjadi penurunan debit mulai bulan Oktober s/d Desember 2012, sehingga kebutuhan masyarakat tidak dapat terpenuhi. Sedangkan pada jam puncak beberapa dusun mendapatkan debit aliran yang sangat rendah, bahkan tidak mendapatkanya sama sekali. Hal ini disebabkan karena keterbatasan debit yang disediakan oleh sumber, dimana debit maksimum yang dihasilkan oleh sumber sebesar 12,4 L/s, sedangkan kebutuhan pada jam puncak mencapai 22,09 L/s.Selanjutnya untuk analisa head loss dan head tekan sisa, pada jam puncak untuk pemakaian maksimum (bulan Pebruari 2012) terdapat dua dusun yang mengalami head tekan sisa yang cukup rendah dibandingkan dengan dusun yang lain. Kedua dusun tersebut yaitu di dusun Ujung berdasarkan perhitungan manual sebesar 20,15 m, dan berdasarkan simulasi Epanet 2.0 sebesar 21,94 m, sedangkan di dusun Permas berdasarkan perhitungan manual sebesar -2,81 m dan berdasarkan simulasi Epanet 2.0 sebesar -1,50 m. Hal ini menyebabkan potensi hambatan aliran menuju kedua dusun tersebut cukup tinggi, dan aliran cendrung akan menuju tempat di mana Head Tekan sisa yang lebih tinggi. Permasalahan ini dapat diatasi dengan memperbesar diameter pipa transmisi yang menuju kedua dusun tersebut dari 2 in menjadi 3 in. Head tekan sisa yang dihasilkan setelah menggunakan diameter pipa 3 in adalah di dusun ujung berdasarkan perhitungan manual sebesar 111,31 m, dan berdasarkan simulasi Epanet 2.0 sebesar 112,45 m, sedangkan di dusun Permas berdasarkan perhitungan manual sebesar 102,72 m dan berdasarkan simulasi Epanet 2.0 sebesar 103,01 m.
PERANCANGAN PIPA PESAT, DAN DAYA KELUARAN PEMBANGKIT LISTRIK TENAGA AIR KOKOK PUTIH DESA BILOK PETUNG KECAMATAN SEMBALUN KABUPATEN LOMBOK TIMUR
Authors: Mahendra Berlian , Mara Made , Padang Yesung Allo
Published: January 2018

Inconsequent of decreasing fossil energy, It is necessary to developing an alternative energy source. One of the alternative energy that can be developing in Indonesia especially at Bilok Petung village, district of Sembalun, East Lombok Regency is water power station.This design is to review power station plan in Koko Putih that will have finished. Inputs in this design are flow rate and head which are available in Koko Putih. From this design, it is obtained that the inside penstock diameter  987 mm and the thickness  penstock in head 286.72 m is 15.15 mm, penstock material is carbon steel with specification ASTM A252 Grade 2. Head effective of Koko Putih water power plan is 249.603 m. Output power of turbine is 3.9 MW and output power of generator is 3,6 MW.
PENGARUH IGNITION TIMING DENGAN BAHAN BAKAR LPG TERHADAP UNJUK KERJA MESIN BENSIN EMPAT LANGKAH SATU SILINDER
Authors: Mara Made , Wirawan Made , Ma’bud Towilan
Published: January 2018

Shortage of petroleum in Indonesia is a problem that triggers people to look for alternative fuels derived fuel. One of them is the use of LPG fuel as motorcycle fuel. And to improve the performance and efficiency of the use of LPG fuel in vehicles is one of them by varying the ignition timing.The aim of this study to explore the effect of ignition timing on the torque, power and specific fuel consumption effective (SFCE) with LPG fuel using converter kit on petrol engine four stroke single cylinder Honda Astrea Prima 100 cc. In this study, the ignition timing is varied at 15˚, 17˚, 19˚ and 21˚ before TDC and to set engine rotation at 1500 rpm, 2500 rpm, 3500 rpm and 4500 rpm.The results of the experiments conducted in this study show a better performance of the engine when the ignition timing advanced earlier. Highest torque at 17˚ before TDC is 0,507 kgf.m at 4500 rpm, the highest effective power at 17˚ before TDC is 3,183 PS at 4500 rpm, and the lowest SFCE at 17˚ before TDC is 0,084 kg / jam.PS at 4500 rpm.
ANALISA VARIASI TINGGI KELUARAN TABUNG KOMPRESOR TERHADAP UNJUK KERJA POMPA HIDRAM
Authors: Ahmadi Suparman , Sutanto Rudy , Mulyanto Arif
Published: January 2018

Water is one factor that is very important and necessary in the life of living creatures. Therefore, water should be available whenever and wherever in sufficient number, time, and it’s quality. The distribution of water in the plateau required an environmentally friendly tool and lower of operational cost. Hydraulic Ram (Hydram) pump is a pump which does not require external energy as the main driving force. This research would observe the effect of discharge input‘s variation and high variation of the compressor tube output (Air Chamber) toward the efficiency resulting.The specifications of Hydram pump which is used in this research is a 3-inch compressor tube (Air Chamber) with 60 cm of height. On the compressor tube there are five high variations output with 10 cm range in each pump’s body. The high levels of water used is 6 meter from the pump and the high water lift (output) used is 9,2 meter. Whereas, the parameter measured in this research are discharge input, discharge output, and the efficiency.The research result shows that the variation in output which produces high output discharge is greatest at 10 cm high output is 102,24 mℓ/s for input variations discharge 12421,63 mℓ/s, while the output of the lowest discharge generated by high output 50 cm which is 42,08 mℓ/s for input variations discharge 1730,10 mℓ/s. Whereas the highest efficiency that is 5,084 % higher output obtained from 10 cm to 1730,10 mℓ/s discharge input and the lowest efficiency is 1,023 % derived from 50 cm high output with input discharge 12421,63 mℓ/s.
PENGEMBANGAN PRODUK KURSI SUDUT PADA UKM PENGRAJIN BAMBU DENGAN METODE QUALITY FUNCTION DEPLOYMENT (QFD) (Study Kasus :UD.Tiga Putri di Gunung Sari, NUSA TENGGARA BARAT)
Authors: Suartika I Made , Triadi A.A. ALit , Aprentari Rayes Fira Dwika
Published: January 2018

The more demands of the consumers for quality product have made the industry develop product which can satisfy the customers. This study aimed at finding out the design process and the product development which observed the customer’s needs and wants, and developed the initial design to obtain the design which met customer’s wants and needs.This study employed QFD method to identify the Voice of Customers (VoC). VoC was obtained through questionnaire, distibuted to 90 customers from 3 UKMs, i.e. UD Tiga Puteri, and two competitor UKMs, UKM Debu and UKM Mia Bamboo Collection. The questionnare distribution was undertaken to find the lavel of the customer’s interest, so that the UKM needed to develop a new product which met the customers’ satisfaction.From the three studied design, the old design (A) and the two new designs (B and C), the new desigm of chair (C) was the most appealing to the customers, with the average grade of 4.26, and the least appealing was the chair with the design (A) with the average score of 3.54. As for the bamboo chair product development according to the priority for improvement were, respectively, finishing process with priority contribution of 5.7, the strength value with the priority contribution of 2.5, durability with priority contribution of 1.9, and the aspect with the lowest priority value was colour with the score of 0.9.
PENGARUH VARIASI JUMLAH BLADE TURBIN ANGIN TERHADAP OUTPUT DAYA LISTRIK
Authors: Wiratama I Kade , Mara Made , Mulyanto Arif , Harianhady Muliadi
Published: January 2018

Some area in Indonesia such as southern part of Sumatra to Nusa Tenggara have big enough wind speed to produce electrical energy by using wind turbine. However, the potential resources are not yet fully developed, and only 1.4 GW electrical energy has been generating in the Indonesia region. Most of the wind energy generating equipment is designed to the European wind speed which is   10 - 30 knot. So, it is very important to modify the such equipment to be able to implement in Indonesia area which is have a lower wind speed.The purpose of this research is to know the influence of number of blades and wind speed to electricity generated by horizontal axis wind turbine with blade taper inversed linear.The result showed that the highest electrical output power was 2,02 watt produced by 5 blades and 3,5 m/s wind speed. The lowest electrical output power was 2,347 watt achieved by using 3 blades and 2,5 m/s wind speed.
PENGARUH VARIASI JUMLAH BLADE TERHADAP AERODINAMIK PERFORMAN PADA RANCANGAN KINCIR ANGIN 300 Watt
Authors: Adi Sayoga I Made , Wiratama I Kade , Mara Made , Catur Agus Dwi
Published: January 2018

In some areas in Indonesia, such as: the southern part of Sumatra until Nusa Tenggara, wind velocity is large enough to be used as a wind power plant with a range of 5-15 knots of wind speed equivalent 2.5-7.5 m / s. However, wind energy has not yet been developed, there are only a wind power plant with a total capacity of 1.4 GW in Indonesia.  Mostly, instruments wind power is basically intended for European plains wind speed range of 10-30 knots. So that the necessary adjustments for the Indonesian state that smaller wind speed in order to optimize the system work.The purpose of this study was to determine the influence of the number of blades and wind speed on electric power generated by a horizontal axis wind turbine. The type of blade used is arched plate and fitted with a pitch angle of 30o. Key issues to be examined in this study is how the influence of the number of blades (3, 4, and 5 blade) and wind speed (3m / s, 4m / s and 5 m / s) to the performance of horizontal axis wind turbines.These results indicate that the number of blade 5 gives rpm, torque, power and highest Cp compared to the number of blade 3 and 4. Similarly, the wind speed of 5m / s provide better performance on any number of blade. The highest power obtained on the number of blades 5 and wind speed of 5 m / s with an average of 23.775 Watt. The highest Cp values obtained on the number of blades 5 and wind speed of 5 m / s which is an average of 0.4.
PENGARUH JUMLAH BLADE DAN VARIASI PANJANG CHORD TERHADAP PERFORMANSI TURBIN ANGIN SUMBU HORIZONTAL (TASH)
Authors: Wiratama I Kade , Mara Made , Furqan Prina L. Edsona
Published: January 2018

The willingness of electrical energy is one energy system has a very important role in the economic development of a country's survival. As one energy source (wind) can be converted into electrical energy with the use of a horizontal axis wind turbine. Wind Energy Conversion Systems (WECS) that we know are two wind turbines in general, ie the horizontal axis wind turbine and vertical axis wind turbine is one type of renewable energy use wind as an energy generator. The purpose of this study was to determine the effect of the number of blade and the radius chord of rotation (n), Torque (T), Turbine Power (P), Power Coefficient (CP) and Tip Speed Ratio (λ) generated by the horizontal axis wind turbine with form linear taper. The results show that by at the maximum radius of the chord R3 the number blade 4 is at rotation = 302.700 rpm, Pturbine = 7.765 watt, Torque = 0.245 Nm, λ = 3.168 and Cp = 0.403 or 40.3%.
PENGARUH PENAMBAHAN LIMBAH PLASTIK BEKAS TERHADAP KARAKTERISTIK KEKUATAN TARIK DAN KEKUATAN BENDING MATERIAL POLIMER KOMERSIL
Authors: Sujita S. , Hadi S. Gunawan
Published: January 2018

Polyester, epoxy and polyurethane composites are widely used for the matrix. The use of composite materials in the manufacturing industry as well as many studies of composites by utilizing plastic powder and the lack of studies directly comparing the tensile strength and bending properties of composite plastic powder to the treatment of the same fiber. The purpose of this study was to determine the tensile and bending strength of the composite material of polyester, epoxy, and polyurethane with reinforcing plastic powder by varying the volume fraction. In this study, the material used is plastic powder, with a size of 8 mm and the preparation of chopped random fibers, with a fiber volume fraction (0% / 100%, 5% / 95%, 10% / 90%, 20% / 80%, 30 % / 70%, 40% / 60, 50% / 50%, 60% / 40%, and 70% / 30%), using polyester resin, epoxy, and polyurethane as matriknya. Comparison of epoxy resin and polyurethane that is one to one, while for polyester using the catalyst of 2%. Tensile testing with ASTM D 3039, and bending test were conducted with ASTM D 790. The results of tensile testing tensile strength values obtained by variation of the highest volume fraction of 0% is owned by a composite plastic powder with 100% polyester resin with a value of 35.22 MPa, followed by a variation of the volume fraction of the composite with 0% plastic powder with 100% epoxy resin with the strength values pull of 6.40 MPa. While bending test results obtained the highest bending strength values held by the variation of volume fraction of the composite 0% plastic powder with 100% polyester resin with a value of 66.985 MPa, then successively followed by the composite with the highest volume fraction variation possessed by 30% of composite powders plastic with 70% epoxy resin with a value of 42.078 MPa bending strength, for a volume fraction of 50% variation of plastic powder with 50% polyurethane resin to obtain the highest value of bending strength of 6.963 MPa.
ANALISIS SIFAT PENYERAPAN AIR DAN INDEKS NYALA API PADA PAPAN KOMPOSIT YANG DI PERKUAT SERAT DAUN PANDAN DURI DAN LIMBAH SERBUK GERGAJI KAYU SENGON DENGAN RESIN POLYESTER
Authors: Bachtiar Saiful , Sulistyowati Emmy Dyah , Catur Agus Dwi
Published: January 2018

The use of composite materials as an alternative to metallic materials in the field of engineering more widespread, not only as an interior daneksterior in the automotive field but also extended to other areas such as property and architecture is to reduce the incidence of fire one only to find a replacement for wood as a raw material of houses and buildings with other alternative materials are more fire resistant, the material need not be limited in mechanical strength, but also on the physical properties. Therefore, the aim of this study was to analyze the absorption properties of water and fire index in the fiber-reinforced composite board pandanus leaves thorns and wood sawdust filler sengon with polyester resin as matriknya.Analysis of the absorption properties of the water carried by the ASTM D 5529 with a variation of the length of time of immersion (10, 20, and 30 days) and the fiber volume fraction (0%, 10%, 20% and 30%). Testing index of the flame using ASTM E1321 with long burning time of 10 minutes. To test the effect of soaking time and a fiber volume fraction of the weight gain, volume, and density on the board fiber composite pandanus thorns with 10% filler wood sawdust sengon diguanakn Two Ways Analysis Of Variance, and the effect of fiber volume fraction to index Flash Fire is used One Ways Analysis Of Variance.The results showed that the water absorption is affected by fiber volume fraction and longer soaking time. The largest percentage of water absorption occurs in the volume fraction of 30% with long soaking time of 30 days is 24.41%. Similarly, the highest percentage swelling occurs in composite board with a volume fraction of 30% with a 30-day long soaking time is 11:22% .Then the flame to the percentage of the index without fiber composite board has a greater percentage is 167.03%. By contrast the percentage of board composite index gained shortest of composite board with a fiber volume fraction of 30% ie 70.25% composite board with a fiber volume fraction of 30% also have a flame index is lower than the comparison is with wood composites sengon.
ANALISA PEMURNIAN MINYAK PELUMAS BEKAS DENGAN METODE ACID AND CLAY
Authors: Mara Made , Kurniawan Arif
Published: January 2018

Dalam penelitian ini dilakukan pengujian karakteristik viskositas kinematik, specific gravity, warna, kadar air dan volume hasil dari minyak pelumas hasil daur ulang untuk mengetahui variasi campuran optimal antara asam sulfat dengan tanah liat sebagai adsorben pada tahap clay treatment dan kemudian dibandingkan dengan lube base oil standar. Dari pengujian, menunjukkan bahwa campuran asam sulfat dan tanah liat terbukti efektif dalam memurnikan kembali minyak pelumas yang telah terkontaminasi (minyak pelumas bekas). Pada pengujian nilai viskositas kinematik yang mendekati dengan viskositas kinematik lube base oil diperoleh pada variasi campuran A10T400 dengan nilai 13.43 cSt, untuk Specific gravity yang mendekati dengan nilai lube base oil pada variasi campuran A10T300 dengan nilai 0.88983, untuk warna  didapatkan nilai L 4.1 pada variasi A15T500, kadar air terendah pada 0.000633 g/l pada variasi A5T500 dan volume hasil terbanyak didapatkan pada variasi campuran A10T300 yaitu 584.33 ml.
PENGARUH KOMPOSISI BRIKET BIOMASSA KULIT KACANG TANAH DAN ARANG TONGKOL JAGUNG TERHADAP KARAKTERISTIK BRIKET
Authors: Purnawarman Purnawarman , Nurchayati Nurchayati , Padang Yesung Allo
Published: January 2018

Energy crisis in the world especially from fossil fuels which caused by the depletion of non-renewable petroleum reserves. It is therefore necessary to find sources of alternative fuels that are renewable. Biomass is a solid waste that can be used as a fuels source. Peanuts shell and cobs are biomass from agricultural waste which is quite abundant so it is potential to be used as a source of alternative fuels.In this study, peanuts shell biomass combined with charcoal cobs to be made into briquettes by varying the percentage composition of peanuts shell biomass and charcoal cobs as follows 75 : 25, 50 : 50, and 25 : 75. Briquettes that have been printed and then tested its characteristic include heating value, moisture content and ash content.The results show that as the increasing percentage of the charcoal cobs  have a significant influence on the characteristic of the briquettes. Briquettes with mix KKT 25 : ATJ 75 has an higher heating value (HHV) and lower heating value (LHV) the highest is equal to 28.718 kJ/kg and 28.279 kJ/kg, and the lowest percentage of moisture content is equal to 5.854%, but the highest result percentage of ash content is equal to 9.326%. Based on the test of these characteristic, biomass briquettes peanuts shell - charcoal cobs meet quality standards that have been established and eligible to became a source of alternative fuels.
PENGARUH ABSORSI GAS CO2 DAN H2S DALAM BIOGAS MENGGUNAKAN PASTA BATU APUNG TERHADAP PENINGKATAN UNJUK KERJA MOTOR BAKAR
Authors: Sutanto Rudy , Alit Ida Bagus , Rezeki Gilang
Published: January 2018

Human dependence on fossil fuels cause the reserves of energy resources is increasingly reduced. To overcome these problems is urgently needed alternative fuels which are cheap and readily available, one alternative fuel is biogas. However, the use of biogas not yet maximized because of low heating value of the biogas produced from the process without purification. Premium fueled vehicle proved to be turned on using biogas. Tests conducted on the variation of the engine rotation of 1500, 2500, 3500, and 4500 rpm and variations of biogas that has been purified using the paste pumice stone with a variation of the flow rate of purification of  2 liters / minute, 6 liter / minute, and 10 liters / minute. In this test should be able to get the best performance in terms of fineness engine rotation (force braking and fuel consumption). From the test results with the variation of rotation and flow rate variations purification of biogas obtained performance of the motor fuel of the best on rotation 4500 rpm with a flow rate of fuel biogas purification of 2 liters / minute produces a torque value of 6.98 Nm and an effective power of 3288.09 Watt while the value SFCE by 0.33 Liter / Jam.Watt. This proves that, biogas purification using paste pumice stone is able to improve quality of biogas.
POTENSI PASIR LOKAL TANJUNG BINTANG PADA ALUMINIUM SAND CASTING TERHADAP POROSITAS PRODUK HASIL COR ALUMINIUM
Authors: Hendronursito Yusup , Prayanda Yogi
Published: January 2018

Green sand is one of the most important components in the process of metal casting. The sand in Indonesia region is varied level of subtlety, size of sand, and shape of sand. Green sand used in the process of metal casting is possible can affect the quality of casting product. This aims to determine the potential of Tanjung Bintang sand as green sand and the quality of the product in terms of porosity defects. The research was conducted by varying sand river from Tanjung Bintang and sand from Maringgai. Composition made varying  is 100%,75%, 50%, and 25% Tanjung Bintang sand compared Maringgai sand with bentonit and water is 10% and 5% constantly .The Examine of the green sand by SNI 15-0312-1989 among other water content, clay content, Grain Finnest Number (GFN), Shape of grain. The result said aluminium casting product with  50% Tanjung Bintang sand has the lowest value of porosity, 5.08% and the higher value with 75% composition of Tanjung Bintang sand, 6.98%.
Pengaruh jumlah haluan pipa paralel pada kolektor surya plat datar absorber batu kerikil terhadap laju perpindahan panas
Authors: Wirawan M. , Kurniawan R. , Mirmanto Mirmanto
Published: January 2018

Recently the use of energy increases. It leads to the energy crisis. Therefore, it is important to promote alternative energy (renewable energy). One of renewable energies, which is potential in Indonesia, is solar enrgy. Solar energy can be harvested using a solar collector. This device can collect or absorb solar radiation and convert it to thermal energy. In this study, two identical collectors are used. One collector consists of 7 pipes and the other comprises 9 pipes. The overall dimension of the collector is 100 cm x 80 cm x 10 cm and the absorber of the collector is made of gravels with a mesh size of 9.5 -12.5 mm. The collectors are placed with a slope of 15o facing to North. The volumetric rates of water used in the experiments are 300 cc / min, 350 cc / min and 400 cc / min. The results show that the collector with 9 pipes is better than that with 7 pipes.
Sampul Dinamika Teknik Mesin Desember 2016
Authors: Dinamika Dinamika
Published: January 2018

Sampul Dinamika Teknik Mesin Desember 2016
Analisis pemakaian bahan bakar biogas termurnikan pada unjuk kerja motor bakar
Authors: Sutanto Rudy , Wardani Kusuma , Mulyanto Arif , Nurchayati Nurchayati , Pandiatmi Pandri , Zainuri Achmad , Sinarep Sinarep
Published: January 2018

The long term purpose of this research is to obtain the high quality renewable biogas that can be used as fuel for internal combustion engines to drive an electricity generator as energy diversification efforts in the area of small sustainable islands. The specific target expected to be achieved is a method/technique for absorbing impurities contained in biogas, especially CO2 component. The study was conducted to reduce the level of CO2 in biogas using NaOH solution. The mass flow rates of biogas employed were 2, 4, 6, 8 and 10 l/min. The biogas was then tested using an engine to see the effect CO2 on the engine performance at several rotations, i.e. 1500, 2500, 3500, and 4500 rpm. The results show that the torque increases by 21.3% for biogas B2 compared to the unpurified biogas. For biogas B4, the torque increases by 19.1%. While for biogas B6, B8, and B10, the torques increase by 14.9%, 12.8%, and 8.5% respectively. For biogas B2, the SFCE decreases by 33.4%, for biogas B4, the SFCE declines of about 22.7%, while for biogas B6, the SFCE declines by 17.9%. The SFCSs also decline by 13.9% and 8.5% for biogas B8 and B10.
Analisis pengaruh variasi elektroda las e6013 dan e7018 terhadap kekuatan tarik dan kekerasan pada bahan baja ss 400
Authors: Shomad M. Abdus , Shahar Mushfi M.
Published: January 2018

Development of technology in the field of construction is increasingly advanced today, will not be separated from technology or welding techniques because it has a very important role in engineering and metal repairs.This study aims to determine the effect of electrode to tensile strength and hardness of SMAW welding on SS 400 steel. The material is given welding treatment with electrode variation E6013 and E7018 diameter of 3.2 mm by using SMAW DC reverse polarity ie the electrode holder is connected to positive pole and the parent metal is connected With a negative pole. The type of camp used is V. The highest tensile strength occurred in the specimens of raw materials that amounted to 432.49 MPa which increased by 10.41 MPa from group E7018. The highest yield strength occurred in the raw materials specimens of 308.53 MPa which had an increase of 9.31 MPa from the E7018 electrode variation group. The highest hardness level occurs in the weld metal part of E7018 electrode variation group that is equal to 189.6 kg /mm2.
Heat loss from hot water flowing in a copper pipe insulated using air enclosed with a PVC pipe
Authors: Albayani A. , Mirmanto M. , Syahrul S.
Published: January 2018

This paper presents investigations of heat loss from hot water flowing in an insulated copper pipe. Investigations were performed to know the heat loss from a copper pipe insulated using air enclosed with a PVC pipe. The fluid temperature used was kept at approximately 75°C in the entrance and its mass flow rate was around 12 g/s. The nominal copper pipe diameter was 6.35 mm; while the diameters of the PVC pipe were ranging from 12.7 mm to 5.08 mm. The length of the test section was approximately 3000 mm. The results show that the biggest heat loss is found using the bare copper pipe. When the copper pipe is insulated using air enclosed with a PVC pipe, the heat loss decreases with the increased PVC pipe diameters. The trend of the heat loss agrees with the critical insulation diameter theory.
Analisis emisi gas buang dan daya sepeda motor pada volume silinder diperkecil
Authors: Mara I Made , Adi Sayoga I Made , Yudhyadi IGNK , Nuarsa I Made
Published: January 2018

This research aims to determine the effect of variations diameter pistons on exhaust emissions and fuel consumption. This research used a gasoline engine single-cylinder four-stroke  with variations in cylinder volume 100 cc, 90 cc, 60 cc and engine rotation  1500 rpm, 2500 rpm, 3500 rpm, 4500 rpm, 6000 rpm. Data was collected in transmission N, 1, 2, 3, and 4 each of the three repetitions for each round engine rotation, using a gas analyzer 2400 ultra 4/5 IM Hanatech brand for exhaust emission of CO and HC. Based on data analysis, it can be concluded that with decreasing diameter of piston up to 60 cc can reduce exhaust emissions, especially CO, HC and fuel consumption. The highest HC exhaust emissions was in 100 cc cylinder volume that is equal to 514.33 ppm while the lowest HC emissions obtained in 60 cc cylinder volume at 49.67 ppm. The highest CO emission was obtained on 100 cc cylinder  by 4.64% volume, while the lowest CO emission was obtained on 60 cc cylinder by 0.31% volume. The highest CO2 emissions obtained in 60 cc cylinder amounted to 17.60% volume, while the lowest CO2 emission obtained at 100 cc cylinder  amounted to 8.37%  volume, and the highest fuel consumption obtained in 100 cc cylinder  at 0.65 kg/h, and the lowest fuel consumption obtained in 60 cc cylinder  by 0.06 kg/h.
ANALISIS PENCEMARAN AIR MENGGUNAKAN METODE SEDERHANA PADA SUNGAI JANGKUK, KEKALIK DAN SEKARBELA KOTA MATARAM
Authors: Al Idrus Syarifa Wahidah
Published: January 2018

Abstrak:ÃÂ  Telah dilakukan penelitian tentang analisis pencemaran air menggunakan metode sederhana pada sungai jangkuk, kekalik dan sekarbela, provinsi NTB. Tujuan dari penelitian ini untuk mengetahui pencemaran yang terjadi pada ketiga sungai tersebut dilihat dari uji fisik, uji kimia dan uji biologis ÃÂ secara sederhana. Penelitian ini menggunakan alat dan bahan yang banyak dijumpai sehingga masyarakat dapat menganalisis sendiri untuk membuktikan kondisi air yang digunakan. Dari hasil pengamatan yang dilakukan secara fisik, ketiga sungai tersebut mengalami pencemaran dari segi bau, warna dan suhu. Berdasarkan pengujian secara biologi terdapatÃÂ  aktivitas biologis dan kimiawi mikroorganisme. Hasil pengujian secara kimia, maka dapat diketahui pH sampel air tersebut sebesar 5 (bersifat asam), kemudian pengujian kimia ini juga dilakukan dengan teh, terdapat gumpalan hitam pada ketiga sampel air, perubahan warna menjadi gelap dan lapisan minyak pada permukaan air yang menunjukkan kualitas air tidak dapat dijadikan bahan baku air minum. Penyebab pencemaran air pada ketiga sungai tersebut adalah limbah rumah tangga, limbah pertanian dan limbah industri. Kondisi ini dapat diatasi dengan melestarikan hutan di hulu sungai, dan tidak membuang limbah ke sungai baik cair ataupun padat.ÃÂ Kata kunci: analisi, pencemaran air, metode sederhana, sungai jangkuk, kekalik dan sekarbelaÃÂ ÃÂ Abstract: Research on watersÃ¢â¬â¢ pollution analysis have been conducted by simple analytical method at Jangkuk, Kekalik and Sekarbela rivers, West Nusa Tenggara Province. The aim of this research is to find out the watersÃ¢â¬â¢ pollution at those three rivers by looking at its physical, chemical, and biological test with a simple method. This research used daily tools and materials which easy to find so that ordinary people could analyze and prove the condition of the water in which they used every day. From the result of physical test, it showed that three of those rivers were polluted in term of smell, color, and temperature aspects. Based on biological test, it showed that there are activities of biological and chemical microorganisms on the water. From its chemical test, it showed that the pH of the sample water is 5 (positively acid). The chemical test found black spot at those three samples of water if filtered by tea. The waterÃ¢â¬â¢s color changed brown and found some oilly compound at the surface. This condition showed that the waterÃ¢â¬â¢s qualities are bad and not suitable to be consumed. The causes of the water pollution are mostly from home, agricultural, and industrial trashes. This problem could be solved by replanting the river side and not throwing the trashes materials (liquid or solid materials) into the rivers.ÃÂ Keywords: Analysis, Water Pollution, simple method, Jangkuk River, Kekaik River, Sekarbela River.
ANALISIS KECENDERUNGAN PENELITIAN TESIS MAHASISWA PADA PROGRAM STUDI MAGISTER PENDIDIKAN IPA UNIVERSITAS MATARAM
Authors: Zulkifli Lalu , Jekti Dwi Soelistya Dyah , Ramdani Agus
Published: January 2018

This study aims to determine the distribution and trends of student thesis research on science education master study program University of Mataram, in terms of the type of research, the focus of study and research subjects. Data obtained through documentation techniques. Data were analyzed by descriptive qualitative tehniques and continued with FGD. The results showed that 73% of the student's thesis research themes included in the education and 27% belong to the natural science (Biology, Physics, and Chemistry). Education research was dominated by learning methods (50%), media applications and media development (17%), respectively, followed by the development of learning tools (13%) and the competence of teachers (3%). Thesis research subjects was dominated at the level of high school (70%), followed by junior high (25%), S1 (2.5%), and teachers (2.5%). Analysis based on the year thesis from 2009 to 2014 provided information that there were increasing trends on topics related to the development of media and the development of learning tools. Focus Group Discussion recommended that the topics for thesis research in the future which need to be improved are the topic of media development, development of learning tools and topics related aspects of critical thinking.Keywords: thesis research, trends, subjects, education