bluuebunny/crossref_metadata_2025 huggingface dataset:
PENGARUH BEBAN TEKAN TERHADAP KEMAMPUAN EKSTRAKSI MASSA CAIR SLURRY OLEH “ALAT PEMISAH FASES-URINE SAPI” YANG DIOPERASIKAN SECARA MANUAL
Authors: Nurpatria N. , Padang Yesung Allo
Published: January 2018

Cow manure can be used as a source of energy and as a solid or liquid fertilizer. An adult cow can produce fases (solid manure) to 23 kg/day and urine (liquid manure) 9 kg/day. Three or four cow is capable to fullfill the dayly needs of cooking fuel for one rural household. Cow manure slurry can also be convert as fertilizer, that is liquid fertilizer which is derived from urine and solid fertilizer originating from the solids. Solid and liquid from cow manure is usually mixed, therefore to make the liquid and solid fertilizer, the liquid and solid masses need to be separated first. Recent separators of fases and urine are are electrical energy driven, so that those kind of device could not be used in the rural areas where the electric grid supply were not available. So that a model of a faces-urine separator of cow manure slurry is utilize which was constructed for manual pressing force. Moreover, through this research It have had created a manual fases-urine separator which only requires one operator. The separator consists of main parts including; lever press, chamber press, fases-urine separation mechanism, the mechanism of loading-unloading, and ajustment mechanism for pressing pressure. This design is capable of performing the separation in a wide range of pressing force and it only requires one operator. Results Show That the model is capable to separate liquid from the slurry as much as 13.9% at a pressing force of 14 kg the which is applied for 18 seconds.
KEAUSAN BANTALAN BOLA YANG DI IMPLANTASI ION TiN DENGAN PELUMASAN GREASE
Authors: Sinarep S.
Published: January 2018

It has been conducted on the effect of ion implantation of TiN to wear ball bearings with grease lubrication. Ball bearing is one of the supporting components contained in the machine and the parts of a rotating element as found in automotive components. During the operation, this component causes the surface wear and vibration caused by continuous movement during loading. Ion implanted TiN ball bearing at the time of 90 minutes, the energy of 100 keV and current 10 μA are ring inside the outer ring, and ball as the wear test samples. Tests carried out with 3 variations of wear load and 3100 rpm shaft rotation. Grease is used to mark the torch. Then 3.9 grams of grease in then applied to the outer ring, inner ring and the ball. The test results showed that the wear volume increased with increasing the load on ball bearing non-implantation with grease lubrication, while the ion implanted TiN almost no increase. Wear resistance increased in metal ion implanted TiN. It is characterized by decreasing in wear rate when compared with non-metal implants. And traces of scratches experienced a very significant reduction in metal ion implanted TiN.
Kajian Pengaruh Fraksi Volume Serat Akibat Perlakuan Alkali Terhadap Ketangguhan Impak Komposit Limbah Serat Aren-Polyester
Authors: Wijoyo Wijoyo , Nurhidayat Achmad , Purnomo Catur
Published: January 2018

The purpose of this study is to investigate the influence of fiber volume fraction of the impact strength of palm fiber-unsaturated polyester composite and investigate the mechanism of fracture caused by impact loads. This research material is palm fiber (Arenga pinnata), unsaturated polyester matrix yukalac BQTN-EX 157 type, hardener metyl etyl ketone peroxide (MEKPO), alkali solution (NaOH) and H2O. Testing with Charpy impact tester, impact test specimens prepared according to standard test ASTM D-5942. While the macro picture is used for the analysis of the fracture. The results showed that the most optimum impact toughness of palm fiber-polyester composite reached 0.011 J/mm2 on volume fraction (Vf) 40%. While the interaction characteristics of palm-fiber bond strength polyester showed matrix cracking behavior of failure on volume fraction (Vf) 10% to 30%, and fiber pull out the volume fraction (Vf) 40% and 50%, the same fracture behavior between the matrix and fibers in volume fraction (Vf) 40% indicates that fiber and matrix has a strong bonding interaction.
Dinamika Teknik Mesin Juli 2011
Authors: Dinamika Dinamika
Published: January 2018

Dinamika Teknik Mesin Juli 2011
PENGARUH TEBAL STYROFOAM CORE TERHADAP BERAT JENIS DAN KEKUATAN TEKAN KOMPOSIT SANDWICH MATRIKPOLYESTER DIPERKUAT SERAT SISAL DAN SERAT POHON PISANG
Authors: Sinarep S. , Catur Agus Dwi
Published: January 2018

Sandwich composite structure consisting of a core is flanked by two skin.  Therefore, the density of the composite sandwich are influenced by core composites material, the more light core the more lightweight composite produced. So also with the composite compressive strength is also very dependent on the core material. In this paper discussed the influence of core thickness on density and compressive strength of composite sandwich. Sisal fiber or  banana tree fibers that have been woven embedded in polyester composites to strengthen the skin. Composite core (Styrofoam) inserted between the two types of laminated composites to reduce weight and increase rigidity. The variation of the thickness of the core is applied in the manufacture of composites. Made of composite density was measured for specific gravity compared to wood or wood products on the market. Compressive strength of composite was characterized to determine the effect of core thickness on the compressive strength of composites.Research results show that the density of composite decreases with increasing thickness of  styrofoam core. Sandwich composite density is much smaller than the specific gravity of wood or wood products on the market.
Pengaruh Konfigurasi Tabung Kompresor Terhadap Unjuk Kerja Pompa Hidram
Authors: Fane Didin S. , Sutanto Rudy , Mara Made
Published: January 2018

AbstractA hydraulic ram pump is a cyclic water pump powered by hydropower. It functions as a hydraulic transformer that takes in water at one pressure and flow rate, and outputs water at a higher hydraulic head and lower flow rate. Hydraulic ram pump uses the water hammer effect to develop pressure that allows a portion of the input water that powers the pump to be lifted to a point higher than where the water originally started. The hydraulic ram pump is used in remote areas, where there is both a source of low-head hydropower and a need for pumping water to a destination higher in elevation than the source.In this research using tube compressor with 3-inch tube diameter and height 25 centimeters. Level of water used is at position 5 meters with 8 meters height of calculate the output discharge. The observed parameters are input pressure, output pressure, the tube compressors pressure; valves waste pressure, water discharge input, output water flow and pump efficiency.The result showed that hydram pump ILK position, with parallel compressor tube configuration have better performance than the configuration of compressor tube series. Which the maximum head 22 meters is achieved. And discharge result at the height calculated (8 meters) of 0.0453 liters / sec and 3.278% efficiency.
Analisa Pengaruh Variasi Sudut Sambungan Belokan Terhadap Head Losses Aliran Pipa
Authors: Zainudin Zainudin , Adi Sayoga I Made , Nuarsa Made
Published: January 2018

On the water distribution, the connection of pipe bends is typically obtained either in industry or in housing. On the water distribution, it is often gained the lost of energy or head losses. The amount of head losses occurring in the connection of branch pipe is influenced by several factors, such as: diameter, flow, viscosity, and the angle at the bend pipe connections.This study aimed to determine the effect of variation of the connection point of the bend pipe to the head losses and pressure drop. To do it, the researcher uses an experimental method as a tool by varying the bend angle is 30o, 45o, 60o, and 90o. The result shows that head losses and the small pressure drop occur in the bend angle 30o is 73, 23 mm and 907.606 N/m2. While the head losses and pressure drop is the greatest at an angle of 90o, is 74, 80 mm and 1278,899 N/m2.
Analisis Variasi Jarak Sumbu Poros Terhadap Tegangan Kontak Dan Tegangan Bending Pada Helical Gear Pair Berdasarkan Metode Elemen Hingga
Authors: Ali Rohman Sopyan , Okariawan IDK , Zainuri Achmad
Published: January 2018

This researchs object is determining  the effect of modifying center distance to bending stress and contact stress on the helical gear pair based on the finite element method. And to know the safety factor on each center distance variation within helical gear pair.Gear being analyzed is one of the gears on Honda motor cycles branded Beat. To know the specification of gear, the helical gear geometry measurements were taken. Based on the results of measurements was carried out models of helical gear pair by AUTO CAD software. Then,  bending stress and contact stress analysis with finite element method on  ANSYS 12.1. Optimal center distance of gear pairs is determined by safety factors on the quasi statatis condition.From the research results can be concluded that the change of center distance can affect the bending stress and contact stress on gears and affect of security design. A safe center distance variation is 52.65 mm, 52,75 mm, 52,85mm and 52.95 mm.
PENGARUH TAHAPAN PROSES PELUBANGAN DAN ARAH SERAT TERHADAP KEKUATAN TARIK MATERIAL KOMPOSIT POLYESTER-PANDAN WANGI
Authors: Sunardi Heri , Zainuri Achmad , Catur Agus Dwi
Published: January 2018

Almost all components, both metallic and non-metallic, experience the process of splicing (joining) with other components. Metal components can be welded, bolted and riveted. However, a special non metal materials such as composites, joining can not be done by welding. One type of connection is suitable for composite materials and keeling bolt connection.             The purpose of this study was to investigate the influence of the stage of making a hole with drilling machine and a variation of the fiber direction tensile strength of fiber-reinforced composite material with at pandan wangi polyester matrix. On stage perforation process conducted by three stages with the first stage (diameter 2, then continued with a diameter of 4 and 6 mm), stage II (diameter of 4 and then continued with a diameter of 6 mm), and stage III (diameter 6 mm). And for a variety of fiber direction using random fiber direction, the direction, and woven with 30% fiber volume fraction.              The results of this study showed an increase in tensile strength composite material fiber reinforced polyester-pandan wangi with unidirectional fiber orientation, which contained the highest tensile strength of the composite stage I in the amount of 27.20 MPa and a tensile strength composite lowest was at stage III amounting 13:00 MPa. In a composite material with random fiber orientation tensile strength decreased by 19.93% with the highest tensile strength found in stage I in the amount of 17.90 MPa and the lowest tensile strength found in stage III at 8:00 MPa. And the orientation of the woven fiber tensile strength decreased by 51.09% with the highest tensile strength is found in the first stage of 17:30 MPa and the lowest tensile strength found in stage III at 6.80 MPa.
PEMERATAAN ENERGI GELOMBANG LAUT DENGAN SISTEM BERPISTON AKSI GANDA
Authors: Adi Sayoga I Made , Nuarsa I Made
Published: January 2018

Semakin menipisnya cadangan minyak dunia menyebabkan harga bahan bakar minyak (BBM) terus melambung. Kondisi ini menyebabkan masalah yang serius yang perlu diatasi. Potensi energi yang diperbaharui seperti : energi angin, matahari dan gelombang laut  perlu segera dilirik walaupun mungkin sudah terlambat. energi potensial dan kinetik yang terkandung pada gelombang laut dapat  dikonversikan untuk pemanfaatan tenaga listrik maupun pompa air bersih dan irigasi. Tujuan penelitian adalah untuk memanfaatkan potensi energi gelombang untuk dikonversi menjadi tenaga listrik.  Adapun manfaat penelitian ini adalah akan diperoleh metode dan sumber energi alternative yang ramah lingkungan serta tidak membutuhkan bahan bakar minyak. Energi alternatif ini ditunggu pemanfaatannya oleh masyarakat.    Kegiatan penelitian diawali dengan studi literatur untuk mengkaji penelitian yang terdahulu, mencari perumusan dengan teori yang ada. Hasil studi literatur dilanjutkan membuat disain atau rancangan alat dengan perhitungan–perhitungan. Perhitungan mengacu pada prinsip pemanfaatan energi gelombang laut semaksimal mungkin. Dari perhitungan tersebut sangat menentukan langkah selanjutnya seperti pembuatan bentuk, pemilihan bahan, menentukan alat ukur dan model pengukuran.             Konversi energi dari gelombang ke piston yang paling efektif terjadi pada saat pelampung (piston) diberikan beban W setengah dari Fa Total (W=Fa/2 total) dibandingkan pada saat tak berbobot (W=0) maupun pada saat piston diisi penuh (W=Fa total).            Dari hasil pengujian ternyata prototype pemerataan gelombang laut dengan sistem aksi ganda mampu menghasilkan energi listrik. Pada saat gelombang naik, energi gelombang menekan tuas melalui pelampung yang selanjutnya memutar roda gigi yang telah terhubung dengan generator listrik. Sedangkan pada saat gelombang turun roda gigi juga berputar akibat berat pelampung yang telah diiisi pemberat air.
REDAMAN SUARA PADA KOMPOSIT SANDWICH POLYESTER BERPENGUAT SERAT SISAL DENGAN CORE STYROFOAM
Authors: Sinarep S. , Catur Agus Dwi , Hafidzul M.
Published: January 2018

Penggunaan serat alam pada kulit komposit sandwich dalam  sekat bangunan perlu diteliti kemampuannya untuk menyerap energi suara pada beberapa frekuensi suara target.            Bahan penelitian ini adalah serat sisal anyam, resin polyester, styrofoam. Komposit dibuat dengan metode hand lay-up. Komposit  sandwich polyester tersusun dari dua skin dengan core ditengahnya. Fraksi volume serat komposit sandwich polyester sebagai skin adalah 30 %.  Core yang digunakan ada 2 macam variasi ketebalan yaitu 30 mm dan 40 mm. Spesimen dan prosedur pengujian koefisien redaman suara mengacu pada standar ASTM E1050.Hasil rata-rata redaman suara yang besar terdapat pada spesimen komposit sandwich dengan ketebalan core 30 mm dengan hasil yang fluktuatif pada kenaikan tingkat frekuensi pegujian.  Pada frekuensi rendah 250 Hz dengan nilai redaman 0,809 yang dilapisi kain beludru, frekuensi sedang 750 Hz dengan nilai redaman 0,819 yang dilapisi karpet, dan pada frekuensi tinggi 1500 Hz dengan nilai 0,725 yang dilapisi kain beludru.
CONTROL OF THE TWO DoF INVERTED PENDULUM
Authors: Fajar M.
Published: January 2018

This paper describes how to simulate and control the two DoF inverted pendulum system, a dynamics of multibody system. The control strategy used is based on the conventional feedback method for the stabilisation of the two DoF inverted pendulum system. Simulation study has been done shows that conventional method i.e. pole placement control strategy is capable to control multi input and multi output of the two DoF inverted pendulum system successfully. The result shows that pole placement control strategy gives satisfactory response that is presented in time domain.
ANALISA UNJUK KERJA MOTOR BAKAR BERBAHAN BAKAR BIOGAS TERMURNIKAN BERBASIS ABSORBER Fe2O3
Authors: Sutanto Rudy , Alit Ida Bagus , Nurchayati N.
Published: January 2018

Long-term aim of this research is to obtain a biogas what the renewable natural gas quality and can be used to fuel an electric generator to support the availability of electricity in the region of small islands. Specific targets to be achieved is to determine whether the binding of H2S in biogas can raise engine peformance of the machine, information technology and the active materials so comprehensive to absorb hydrogen sulfide gas as materials of the textbook writing and articles for national journals. This research will be conducted a biogas testing in the engine performance, seen from the engine rotation (1500, 2500, 3500 and 4500 rpm) of the electric power generated and subtlety spin machine (braking force, fuel consumption) in both the before purified biogas and biogas has been purified. Results of the research that has been conducted in both the before purified biogas and biogas has been purified on peformance engine that does not change significantly for the better performance of the engine torque, effective power and fuel consumption (biogas) to treat a wide variety. Effect of reduction of H2S contained in the biogas no significant effect on engine performance but are more inclined towards corrosive metal material. Keywords: biogas, performance, torque, effective power
APLIKASI BREAK EVEN POINT PADA SISTEM OPERASIONAL KAPAL MOTOR PENYEBERANGAN RODITHA PT. ASDP INDONESIA FERRY (PERSERO) CABANG LEMBAR
Authors: Wijana Made , Triadi A.A. ALit , Febriandi Firza
Published: January 2018

This study is intended to analyze the feasibility operation KMP Roditha which owned by PT. ASDP Indonesia Ferry (Limited). Location of research in the trajectory Sheet - Padang Bai, was used the Break Even Point. Collecting a range of cost of KMP Rodita, therefore was known the operating costs, maintenance costs and income from the sale of tickets while one year. Stepsare used in this research is the analysis of quantitative data, where i would collect the data required in relation to the matter to be investigated, so that research results can be more reliable and credible. The results of this study indicate that KMP Roditha income in 2010 was Rp. 12,007,178,916, of a total of 504 trips. Break Even Point in 2010 occurred in the 5th month on 213 trips, so that KMP Roditha feasible to operate.
PERANCANGAN ALAT PEMINDAH PERAHU ”MODEL DEREK” UNTUK NELAYAN TRADISIONAL PESISIR PANTAI CURAM
Authors: Yudhyadi IGNK , Suartika I Made , Zainuri Achmad , Fajar M.
Published: January 2018

The steep coastal topography makes the traditional fisherman facing a difficulty for moving boat from/to the sea towards the mainland. With the slope of 2 - 3 meters, it required at least 4 people do the job. This situation is very disturbing and reducing the productivity of the fishermen itself. Therefore, it needs a special equipment or appropriate technology to overcomes the drawback situation. So that, it will improve the efficiency and effectiveness of fishing operations. The method used in this study is an applied research method which the tool is designed based on real phenomena. Moreover, the outcome is the design of boat transfer device that will be used as an additional supplement to the teaching material of design and product development, industrial management, as well as a scientific publications. The design expected can improve the steep coastal fishermen productivity and welfare.
ANALISIS PERILAKU ALIRAN TERHADAP KINERJA RODA AIR ARUS BAWAH UNTUK PEMBANGKIT LISTRIK SKALA PIKOHIDRO
Authors: Jamlay Kristianus , Sule Luther , Hasan Duma
Published: January 2018

Energy of water is one of the renewable energy that can be converted into electrical energy without pollution. Rotation, torque, and power generated by the water wheel can be used directly both for irrigation pumping and for running a rice mill even move the alternator and electrical generators. The purpose of this study was to find the best water wheel performance indicated by torque, rotation, and power as well as the relative speed of the water at the side of the blade. The results obtained in the preliminary test were the average water velocity of 2.50 m/s, the average rotation shaft of 79.78 rpm, the average torque on the shaft of 58.98 Nm, the average power of 510,67 W. The second results were also obtained as given the results and discussion section. It was found that the best water wheel performance based on the analysis was shown in the second test results.
STUDI KELAYAKAN PENGGUNAAN MESIN DIESEL DENGAN METODE BREAK EVEN POINT (BEP) DAN ANALISIS SENSITIVITAS PADA PLTD (Studi Kasus : PT PLN Persero Sektor Pembangkitan Lombok PLTD Ampenan)
Authors: Wijana Made , Triadi A.A. Alit , Anwar Lalu Syahrul
Published: January 2018

This study intended to analyze the feasibility of the use of the Power Plant (PLTD) of Ampenan using the break even point (BEP) and sensitivity analysis. That there are several alternatives that can be taken are: first, if the use of the selling price to the public's ability to     Rp. 800 per kWh and a subsidy of Rp. 29.758.612.278 per month, then power plant will have a turnover in the  month to 12 to earn a revenue of Rp. 159.148.857.478. Secondly, if the use of the selling price to Rp. 900 per kWh and a subsidy of Rp. 28.100.809.978 per month, then power plant  will have a turnover in the month to 12  to earn a revenue of Rp. 179.042.464.663. Thirdly, if the use of the selling price to Rp. 1000 per kWh and a subsidy of Rp. 26.443.007.678 per month, then power plant will have a turnover in the month to 12 to earn a revenue of        Rp. 199.936.071.847. Then the results of research using sensitivity analysis to changes in the initial investment is known that the increase in initial investment 600,83% below power plant  is still feasible to operate.. But the power plant  would not be feasible to operate when the increase 600,83% above the initial investment.Furthermore the sensitivity analysis to changes in income are known to decrease in revenue of less than 85,73% of power plant is still worth operating.  But if the decline in revenue was down more than 85,73% power plant operation is not feasible.
KARAKTERISTIK SIFAT MEKANIK KOMPOSIT SERAT BAMBU RESIN POLYESTER TAK JENUH DENGAN FILLER PARTIKEL SEKAM
Authors: Budiman Agus , Sugiman Sugiman
Published: January 2018

This paper presents the effect of volume fraction of rice husks on the mechanical properties of bamboo fiber/unsaturated polyester composites. The composite specimens were made from bamboo fiber with fixed volume fraction of 40% and rice husk particle as filler with volume fractions varied 0%, 10%, 20% and 30%. Matrix used was unsaturated polyester resin. Bamboo fibers and rice husk were surface treated using alkali solution 4% (by weight) for 2 hours. The manufacturing process of composite was using hand layup method. The specimens were tested in tension, bending and in impact loading. The results show that the addition of rice husk particles up to volume fraction of 20% does not result in a decrease of tensile strength, but after a volume fraction of 20%, the tensile strength tends to decrease. In bending test, the rice husk volume fraction up to 20% increase the bending strength, but after that then it tends to decrease. However the bending modulus seems unaffected by the volume fraction of rice husk. Similar to the bending modulus, the impact strength is not significantly affected by the volume fraction of rice husk.
Studi visualisasi aerodinamika model sudut kemiringan badan pelari
Authors: Rubiono G.
Published: January 2018

A runner deals with several forces during running in air medium. Aerodynamics is a branch of science which studies the object behavior in air flow. This research is aimed to visualized angle body inclination of a model runner as aerodynamics study. The research is done in wind tunnel. The model use is a puppet with 30 cm height. Visualization is done by smoke method and recorded with a camera. The data is analyzed to get the curve angle of fluid flow. The analysis is done by Microsoft Visio Professional 2002 SR-1. The result shows that model runner body inclination has effect due to aerodynamics aspect. The increase of inclination angle tends to increase the curve angle of fluid flow.
Unjuk kerja kulkas termoelektrik dengan rangkaian seri dan paralel pada beban air 1500 ml
Authors: Ananta Hendra , Padang Yesung Allo , Mirmanto M.
Published: January 2018

Along with the increase of human mobility, the portable refrigerator becomes very important because it can be used to store goods or drinks to be durable or cooler. Therefore, a refrigerator using thermoelectric is an option. Thermoelectric fridge besides easy to carry anywhere is also easy maintenance, durable, more compact, lightweight, no heavy rotating components, no use of freon and small power. Refrigerator research with thermoelectric has been done with series and parallel electric circuits to know the effect of the circuit difference to the performance of refrigerators. This study uses a mini fridge with an overall dimension of 40.8 cm x 32.6 cm x53.8 cm and with 2 thermoelectric modules TEC1-12706 model. The electrical power used for each circuit is about 12 W. The data retrieval in the test uses DAQ MX 9714 NI data logger which is connected to the PC using LabView program. The results show that the test research with a water load of 1500 ml results in the temperature of the refrigerator room of about 22.54oC for the series and 23.10oC for the parallel. While the value of COP obtained with the series circuit is 0.45 and with the parallel circuit is 0.4. There is no effect of the form of the circuit on the performance of the refrigerator.
Analisis tegangan pada batang utama mekanisme bukaan payung raksasa
Authors: Santoso G. , Permana M.S.
Published: January 2018

Spacious areas as venues for events such as weddings, gatherings, musical performances, bazaars even as parking lots, need to be protected from climate change. Therefore, it is necessary to develop the design of a giant umbrella axle mechanism measuring 12 x 12 meters with a height of 8 meters. This paper describes and stresses the stress analysis on the main bar of the giant umbrella opening mechanism. The result of modeling on the stem is presented in the form of stress contour, factor of safety (FOS), and displacement. The largest working voltage is 2 MPa in the connection area, but this voltage is still low when compared with ASTM A36 rod material structure or equivalent to SS-41 which has a yield strength of 100 MPa. The low voltage von misses are relevant to FOS values that generally reach 100 or more. The largest displacement value is in the center of the stem, which is 0.3 mm. Thus, the modeling results are able to withstand a load of 1 ton.
Analisis tekanan udara, sudut slip dan ukuran lebar ban tipe radial terhadap rolling resistance dengan metode taguchi
Authors: Habibi Ilham , Dwilaksana Dedi , Fachri Boi Arief
Published: January 2018

Rolling resistance is one of the main factors affecting the fuel efficiency of a vehicle. Rolling resistance is resistance to the wheels that will and has been rolled due to the force of friction between the wheels with the road surface of the wheel, due to the deformation process on the tire structure, contact area and road surface. Radial tires are tires where the reinforcing fibers on the carcass are arranged radially, have a greater ability to withstand lateral forces and generally have high ratio aspect ratio, widht smaller than the bias tires. The taguchi method is a new methodology in engineering aimed at improving product and process quality, minimizing cost and time. The purpose of this research is to know the air pressure influence, slip angle and tire width to rolling resistance. The research was conducted experimentally by using taguchi method. The result showed that the highest rolling resistance force accurred at a combination of air pressure of 175 kPa, 9o wheel slip angle and 90 mm widht of tire size of 36.914 N. While the smallest rolling resistance was obtained with a combination of parameters at the air pressure level of 325 kPa, slip angle 1o and the size of the 70 mm tire widht of 11.511 N at 350 rpm and normal load 580 N. From the result it can be concluded that the change in the level of the three air pressure parameters, the slip angle and size of tire width can affect the rolling resistance value.
STUDI KOMPARASI HASIL BELAJAR KIMIA PADA MATERI KOLOID MENGGUNAKAN MODEL PEMBELAJARAN BERBASIS PROYEK DAN MODEL PEMBELAJARAN BERBASIS MASALAH SISWA KELAS XI IPA MAN 2 MATARAM TAHUN AJARAN 2013/2014
Authors: Hesti Safitri Eka , Siahaan Jeckson , Wahidah Al Idrus Syarifa
Published: January 2018

Abstrak: Penelitian ini merupakan penelitian quasi experimental (eksperimen semu) menggunakan Post-test Only Nonequivalent Control Group Design yang bertujuan untuk mengetahui ada atau tidaknya perbedaan hasil belajar kimia siswa menggunakan model pembelajaran berbasis proyek dan model pembelajaran berbasis masalah di kelas XI IPA MAN 2 Mataram Tahun Ajaran 2013/2014.Sampel penelitian diambil dengan teknik Purposive Sampling dan terpilih dua kelas sebagai kelas eksperimen, yaitu kelas XI IPA U1 (kelas ekperimen 1) dan kelas XI IPA U2 (kelas ekperimen 2).Data hasil belajar kognitif diperoleh melalui tes tertulis (post test) yang dianalisis menggunakan uji beda (uji t). Hasil penelitian menunjukkan bahwa pada kelas eksperimen I diperoleh nilai rata-rata 67 dengan ketuntasan klasikal 7,69%sedangkan pada kelas eksperimen II diperoleh nilai rata-rata 70 dengan ketuntasan klasikal 28,57%. Hasil uji-t dua pihak pada taraf signifikan 5% diperoleh thitung = -0,4709dan ttabel = 2,060, sehingga thitungberada pada daerah penerimaan adalah Ho diantara -2,060 dan +2,060 yang berarti Ho pada penelitian ini diterima. Hal ini menunjukkan bahwa tidak terdapat perbedaan yang signifikan hasil belajar kimia antara siswa yang diterapkan model pembelajaran berbasis proyek dan model pembelajaran berbasis masalah siswa kelas XI IPA MAN 2 Mataram Tahun Ajaran 2013/2014.Kata kunci: Koloid, Model pembelajaran berbasis proyek,Model pembelajaran berbasis masalahÃÂ Abstract: The aims of this quasi experimental researchÃÂ  is ÃÂ to compare the chemistry study result by using the project based learning model and problem based learning model at class XI science of MAN 2 Mataram in academic year 2013/2014. Sample of this research were class XI science U1 as experiment I class and class XI science U2 as experiment II class which taken by using purposive sampling technique.Data cognitive of the result study obtained through a written test (post-test) were analyzed using a different test (t test). The results showed that the experimental class I obtained an average value of 67 with classical completeness of 7.69% while the experimental class II obtained an average value of 70 with classical completeness 28.57%. T-test results of the unequal sample at the significant level of 5% was obtainedÃÂ  tcalculation =-0,4709 andttable= 2,060, with the result that tcalculationin the range from to -2,060 and +2,060which means that the Ho in this research is approved. In conclusion, there is no significant difference in result study between students who are taught chemistry using project-based learning model and the problem based learning model students of class XI IPA 2 Mataram MAN inÃÂ  Academic Year 2013/2014.Key words: Colloid, project based learning model, the problem based learning model.
PENERAPAN FREUNDLICH MODEL PADA ADSORPSI-REDUKTIF ISOTHERM AUCL4ÃÂ¯ DENGAN ASAM
Authors: Ismillayli Nurul , Santosa Sri Juari , Siswanta Dwi
Published: January 2018

Abstrak: Telah dilakukan adsorpsi reduktif isotherm AuCl4ÃÂ¯ dengan menggunakan asam humat hasil isolasi tanah gambut Rawa Pening, Ambarawa. Isolasi dilakukan melalui perendaman alam 0,1 M NaOH dan dilanjutkan dengan pemurnian menggunakan 0,1 M HCl/0,3 M HF. Asam humat hasil isolasi dikarakterisasi menggunakan spektroskopi inframerah, ditentukan kadar abunya dan diaplikasikan untuk adsorpsi reduksi isotherm larutan AuCl4ÃÂ¯. Hasil karakterisasi menunjukkan bahwa asam humat hasil isolasi memiliki gugus Ã¢â¬âCOOH, -OH fenolik, hidrokarbon alifatik dan aromatis dengan kadar abu sebesar 1,13%. Data adsorpsi AuCl4ÃÂ¯ ÃÂ dengan menggunakan asam humat lebih menunjukkan kecocokan dengan persamaan Freundlich di banding Langmuir, dengan harga R=0,92, n=1,7184 dan log KF= 4,1707. Reduksi Au(III) menjadi Au(0) oleh asam humat dikonfirmasi dengan munculnya puncak tajam baru dengan nilai 2ÃÂ¸ =38, 44, 64 dan 77ÃÂ° yang merupakan puncak karakteristik dari partikel emas.ÃÂ Kata kunci: adsorpsi reduktif isotherm, AuCl4ÃÂ¯, asam humat, Freundlich.ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ Abstract: Isotherm adsorption reductive of AuCl4ÃÂ¯ by using isolated humic acid of Rawa Pening peat soil, Ambarawa had been conducted. Isolation was done by soaking peat soil in 0.1 M NaOH and following by purification in 0.1M HCl/0.3 HF. The isolated humic acid was characterized using infrared spectroscopy, determined its ash contain and aplicated for isotherm adsorption reductive of AuCl4ÃÂ¯. FTIR spectra indicated that isolated humic acid consist of COOH group, phenolic Ã¢â¬âOH, aliphatic hydrocarbon and aromatic ring, its ash content was 1.13%. Asorption data of AuCl4ÃÂ¯ÃÂ  showed more suitable for Freundlich model than Langmuir model, with R=0,92, n=1,7184 and log KF= 4,1707. Reduction of Au(III) to Au(0) was confirmed by appearance of sharp peak at 2ÃÂ¸ = 38, 44, 64 dan 77ÃÂ° as characteristic peak of gold particles.Keywords: Isotherm adsorption reductive, AuCl4ÃÂ¯ , humic acid, Freundlich.
PENGARUH MODEL PEMBELAJARAN KOOPERATIF NHT DAN STAD TERHADAP HASIL BELAJAR SIKAP SISWA SMA NEGERI 2 GERUNG
Authors: Aryana I. G. M. R. , Al Idrus Agil , Harjono Ahmad
Published: January 2018

ABSTRAK: Penelitian ini bertujuan untuk mengetahui perbedaan hasil belajar sikap siswa antara kelompok siswa yang mendapatkan perlakuan model pembelajaran kooperatif NHT dan model pembelajaran kooperatif STAD pada pembelajaran biologi sistem pencernaan. Penelitian ini dilaksanakan di SMA Negeri 2 Gerung pada siswa kelas XI jurusan Ilmu Pengetahuan Alam semester genap tahun pelajaran 2014/2015. Penelitian ini merupakan penelitian kuasi eksperimen dengan menggunakan rancangan Type Between Group Design dengan Posttest Only Design. Populasi penelitian berjumlah 44 siswa terdiri atas dua kelas, dimana keseluruhan populasi dijadikan sebagai sampel penelitian. Melalui teknik simple random sampling ditentukan dua kelas eksperimen. Data yang diperoleh dianalisis dengan menggunakan analisis statistik deskriptif yaitu dengan menghitung rata-rata dari jawaban yang diberikan kemudian dinyatakan dalam bentuk angka persentase dari setiap pernyataan. Angka persentase yang menggambarkan sikap pada indikator: rasa ingintahu, tanggungjawab, dan disiplin diuji hipotesisnya menggunakan analisis uji-t dengan bantuan program SPSS versi 20 for Windows. Hasil penelitian menunjukkan bahwa tidak ada perbedaan hasil belajar sikap yang signifikan antara kelompok siswa yang menggunakan model pembelajaran kooperatif NHT dan model pembelajaran kooperatif STAD dimana diperoleh nilai thitung Ã¢â°Â¤ ttabel (p>0.05) pada setiap indikator sikap.ÃÂ Kata kunci: ÃÂ ÃÂ ÃÂ ÃÂ  ModelÃÂ pembelajaran kooperatif NHT, STAD, hasil belajar sikap siswa.ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ  ABSTRACT: This study aims to determine differences of studentÃ¢â¬â¢s attitude learning outcomes between groups of students who receive NHT cooperative learning model and STAD cooperative learning model treatment for biology digestive system learning. This research was conducted at SMAN 2 Gerung in class of XI. This study is a quasi-experimental research using Type Between Group Design with Posttest Only Design. The number of population was 44 students consit of two classes, and all member of population used to sample study. By using simple random sampling obtained two classes of experiments. Data were analyzed using descriptive statistical and than with count the average of data, obtained scaling data and than hypothesis was tested using t-test analysis with SPSS version 20 for Windows. The results showed there was no significant difference about attitude learning outcome between the group the of students using NHT cooperative learning model and group of students using STAD cooperative learning model in all indicators of attitude that gained tcount Ã¢â°Â¤ ttable (p> 0.05).ÃÂ Key words: ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ ÃÂ  NHT cooperative learning model, STAD, model, studentÃ¢â¬â¢s attitude, learning outcome.
PENGEMBANGAN MEDIA PEMBELAJARAN AUDIO VISUAL PROGRAM MICROSOFT POWER POINT PADA POKOK BAHASAN ORGANISASI KEHIDUPAN KELAS VIIA SMP NEGERI 19 MATARAM TAHUN PELAJARAN 2012/2013
Authors: Armyani Ida Ayu Putu , Martedi Didik
Published: January 2018

Abstrak: Penelitian ini bertujuan untuk meningkatan aktivitas belajar SMP Negeri 19 Mataram dengan menggunakan media audio visual program power point. Program ini dapat memudahkan guru dalam menyampaikan konsep IPA, terutama konsep abstrak menjadi konsep yang konkrit sehingga bisa dinalar siswa, misalnya: organisasi kehidupan. Subyek pada penelitian ini berjumlah 47 siswa kelas VIIA SMP Negeri 19 Mataram. Pengambilan data mengunakan metode observasi, lembar tanggapan dan metode tes.penelitian dilakukan dengan dua siklus. Setiap siklus dilaksanakan dalam dua kali pertemuan. Tahapan tiap siklus meliputi perencanaan, pelaksanaan tindakan, observasi dan refleksi. Hasil penelitian pada siklus I, aktifitas siswa pada Proses Belajar Mengajar (PBM) hanya mencapai 51,06%, ketuntasan hasil belajar mencapai 68,77% sedangkan pada siklus II aktifitas siswa pada PBM sudah mengalami peningkatan yaitu mencapai 84,04%, ketuntasan hasil belajar mencapai 84,26%.Kata Kunci: media, aktivitas belajar, powerpoint.ÃÂ Abstract: This study aims to improve learning activities of SMP 19 Mataram students by using audio-visual powerpoint media. The media can facilitate teachers to convey the concept of science, especially the abstract concept into a concrete concept that can be rationalized by students, for example: organization of life. Subjects in this study were 47 students of grade VII of SMPN 19 Mataram. Retrieving data using the method of observation, response sheets and methods tes. This study was conducted in two cycles. Each cycle consisted of two sessions. Each cycle includes the stages of planning, action, observation and reflection. The results showed that at the first cycle, the student activity in learning process was only 51.06 %, learning outcomes mastery was 68.77 %, while in the second cycle, the students activity wash 84.04 %, learning outcomes mastery was 84.26 %.Key words: media, lerning activity, powerpoint
RESPON SISWA TERHADAP PENGEMBANGAN MEDIA MODEL KEMAGNETAN BUMI
Authors: Fikri Muh. Husnul , Doyan Aris , Harjono Ahmad
Published: January 2018

This study aims to develop instructional media materials science magnetism at the junior level Models Earth Magnetism (MKB)media. The study was conducted by using the approach of Research and Development by Borg & Gall modified by Sukmadinata into 3 stages: a preliminary study, test models and test the product. Modeling exercise carried out in two stages. Limited test phase conducted at SMK Islam Nurul Hikmah Langko West Lombok and wider scale trials as well as the testing phase at SMPN 3 Lingsar. Of wider scale pilot phase characteristics obtained MKB media. At the end of the pilot phase conducted a broader scale questionnaire to get students' response in the development of MKB media at 20 students. Students responded positively to the development of MKB media. Keywords : Media Model of Earth Magnetism , Student Response.
SIFAT PENYERAPAN BUNYI PADA KOMPOSIT SERAT BATANG PISANG (SBP) – POLYESTER
Authors: Khotimah Khusnul , - Susilawati , Soeprianto Harry
Published: January 2018

This research conducted to find the physical properties of the absorption of sound from banana stem fiber (Serat Batang Pisang/SBP) with polyesters’ matrix. The sound absorbent material made with a variety of different volume fraction composition. The comparison between the SBP and the volume fraction of the polyester is made of 30%: 70%, 40%: 60% and 50%: 50%. The method of research was done in three stages: making banana stem fiber, manufacturing composite and testing of composite SBP. Composite testing includes physical properties (sound absorption). Preparation of the samples started by taking a banana stem, decomposition banana stem fiber, alkali treatment with NaOH 4%, then mixing the SBP with the matrix  polyester. Manufactured the composites by press the materials on the molding for 12 hours, then tested to find physical properties. Sound absorption test performed using a signal generator and a sound level meter with the principle of the impedance tube method through acoustic box approach as a reference. The results of the study showed that SBP with polyester composite capable to absorb the sound with sound absorption coefficient α = 0.84 at 50% fiber volume fraction. Thus SBP composites can absorb sound for low and medium frequency, based on the standard ISO 11654:1997 (E) where the minimum of sound absorption coefficient of acoustic materials is α = 0.15. Keywords: Composite, banana stem fiber, sound absorber materials, polyester.
PENGEMBANGAN PERANGKAT MODEL PEMBELAJARAN KUANTUM BERBASIS MASALAH DENGAN PENDEKATAN SAINTIFIK
Authors: Jayanti Mei Indra , Jufri A. Wahab , Ramdani Agus
Published: January 2018

In the Law of the Republic of Indonesia Number 20 of  2003 on the national education system of article 1, paragraph 1 that education will be successful in learning activities where students are able to achieve the expected competencies of science and give a positive value to themselves. Critical thinking ability and reasoning ability is part of the high school biology course goals that can be developed through a student-centered learning, such as quantum learning, problem-based learning, and scientific approach. This study aimed to develop the quantum problem-based learning model packages and the quantum without problem-based learning (PKBM and PKTBM) with 4 and 6 stage of scientific  approach  toward critical thinking ability and  reasoning ability in tenth grades. Process of development teaching and learning packages refers to the model Dick & Carey. Teaching and learning packages developed to biology course for the tenth grade of senior high school in ecological material. Data were  collected by using instruments feasibility characteristics of teaching and learning packages. Data were analyzed using descriptive statistics. The results showed that the syllabus and the learning lesson plan (LLP)  got a worthy category; worksheets, tests of critical thinking ability and tests of reasoning ability got a very worthy category to used in tenth grades of senior high school.Keywords: PKBM, PKTBM, scientific approach, critical thinking ability, reasoning ability
SINTESIS BARIUM M-HEXAFERRITTE (BaFe12-xNixO19) DOPING LOGAM NIKEL DENGAN METODE KOPRESIPITASI
Authors: - Munib , - Susilawati , Savalas Lalu Rudyat Telly
Published: January 2018

Synthesis of Barium M-Hexaferrite (BaFe12-xNixO19) nickel metal doping have been done with co-precipitation method and its effect on temperature changes and substitution dopants. Basic materials used in the synthesis of BaCO3, FeCl3.6H2O, HCl, NH4OH and nickel metal. The process of synthesis of barium M-heksaferit conducted at the Faculty of Mathematics and Natural Sciences Analytical Laboratories Unram. This study used a variation of calcination temperature of 80, 400, 600 and 800°C for 4 hours with a variety of dopants 0; 0.4; 0.7 and 0.9. Synthesis results show that changes in the concentration of the dopant variables and calcination temperature indicate a tendency to change color to brown-black powder.Abstract: Barium Mhexaferrite, dopant, nickel, co-precipitation.
PENGEMBANGAN PERANGKAT PEMBELAJARAN BIOLOGI BERBASIS INKUIRI TERBIMBING (PPBIT) DALAM MENINGKATKAN KEMAMPUAN BERARGUMEN SISWA
Authors: Seprianingsih Dewi , Jufri A Wahab , - Jamaluddin
Published: January 2018

This study was aimed to develop inquiry-based learning tools (PPBIT) and analyzed its effectiveness in developing the ability to argue of students at SMAN 2 Taliwang-West Sumbawa. PPBIT was carried out by applying 4D procedure. Then, pretest posttest control group design also completely concerned in determining the effectiveness of PPBIT. There were 66 students as the sample which was scattered from two classes and was selected by using purposive sampling technique. The results showed that PPBIT was appropriately to be used for students argumentation skills’ activities by an average of feasibility syllabus 78.71%, RPP 83.5, LKITS 75%, and Instruments KB 80.25%, and effective in improving the ability to argue the class X SMAN 2 Taliwang, particularly on the subject of environmental pollution and recycling of waste by the average score of the students' ability from 48.22 up to 85.08.Keywords: PPBIT, Argument
PENGARUH MODEL PEMBELAJARAN LEARNING CYCLE 7E TERHADAP HASIL BELAJAR KIMIA DITINJAU DARI KEMAMPUAN BERPIKIR KRITIS SISWA
Authors: - Patmah , Purwoko Agus Abhi , - Muntari
Published: January 2018

This study aimed to: (1) determine the effect of Learning Cycle 7E model and conventional model towards student’s learning outcomes of Chemistry, (2) determine the effect of the critical thinking skills towards student’s learning outcomes of Chemistry, and (3 ) determine the interaction between the learning model (learning Cycle 7E-Conventional) with the critical thinking skills (High - Low) towards student’s learning outcomes of Chemistry. This research is a Quasi Experiment with the 2 x 2 factorial design and variables in this research consists of independent variables, moderator variables and the dependent variable. Learning Cycle Model 7E and conventional learning models used as independent variables, critical thinking skills students used as the moderator variable, and the learning outcomes used as the dependent variable. Analysis of the research’s results using by Two Way ANACOVA at the level 5% of significance. According to the results of analysis, it was concluded that the critical thinking skills significantly influence on chemistry student learning outcomes, where the average of high group of critical thinking skills, significantly higher than lower group.Keywords: Learning cycle 7E model, critical thinking skills, chemistry learning outcomes
Transcranial Direct Current Stimulation: a potential novel treatment for alcohol addiction and abuse
Authors: Bhandal Amandeep , Sultana Tania , Janjua Khurram
Published: January 2018

Alcohol use disorder (AUD) is a major global health concern. Many treatment modalities have been used in past to help decrease the use of alcohol. Recently, a growing interest has been seen in neuromodulation as a novel treatment means to reduce alcohol addiction behavior. Studies on the effect of Transcranial Direct Current Stimulation (tDCS), especially over dorsolateral prefrontal cortex (DLPFC) have been conducted that have shown to reduce craving and relapse behavior in AUD. Adverse effects associated with tDCS are found to be minor and are temporary in nature. However, the results are preliminary as only few studies are done. More research on AUD done using tDCS will help improve our knowledge and understanding on the various factors involved in AUD besides helping to prevent the cycle of craving, relapse and abstinent.Bangladesh Journal of Medical Science Vol.17(1) 2018 p.7-15