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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
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Articles 11 Documents
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Search results for , issue " Vol 22 No 1 (2017)" : 11 Documents clear
Analisis Regresi Sifat Tanah Terhadap Rebound Tiang Pancang Amalia, Nadya; Rokhmat, Mamat; Sutisna, Sutisna; Viridi, Sparisoma; Abdullah, Mikrajuddin
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Abstract

The behavior of soil around driven pile during pile driving process directly affect the driving process. Two categories of stress are produced during the driving process, i.e. stress along the pile shaft (shear stress) and stress at the end of the pile (compression stress). Since soil is a porous medium, shear and compressive stresses during the driving process will force water to come out of the pores in the soil. Related to hammering and low permeability of the soil at rebound zones such as clay, water can not flow out of the pores and can not be dissipated instantly. As a result, a high pore water pressure will be generated along the shaft and at the end of the pile. Pile coating with titanium dioxide (TiO2) is able to make the pile to be driven deeper than pile without coating with the same count of hammer strokes for pile driving in clay soils. Uniquely, the coating does not give effect to the pile driving in non-cohesive soils. This indicates that the coating is capable in minimizing pile rebound. Regression model is used in this study to identify the characteristics of engineering soil parameters which may cause the rebound phenomenon.
Fabrikasi Transparant Conducting Film Berbahan Dasar Grafit pada Substrat Plastik dengan Proses Mekanik Rahman, Dui Yanto; Sustini, Euis; Abdullah, Mikrajuddin
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Abstract

Transparent Conducting Film (TCF) employing graphite powder as conducting material has been successfully fabricated by using extremely cheap and simple method.  This method doesn’t use heating and transfer process which is commonly used in fabrication of Transparent Conducting Film. Graphite powder was directly deposited on the surface of plastic using circle motion of tube shaped-metal which its surface was covered with thick tissue. The film thickness was varied to investigate the influence of it to the transmittance and resistance of the film. The transmittance and resistance measurement was carried out under UV-Vis electrometer and I-V El-Kahfi equipment assistance, and finally the transmittance of 60% and resistance of 24,4 kΩ was gained for one time of coating, While 9 times of coating produced 13% of transmittance and 773 Ω of resistance.
Sintesis Nanokomposit -Fe2O3/SiO2 dengan Metode Salt-Assisted Spray Pyrolysis untuk Menurunkan Viskositas Minyak Berat Anrokhi, Mohamad Samsul; Nuryadin, Bebeh Wahid; Abdullah, Mikrajuddin; Khairurrijal, Khairurrijal; Iskandar, Ferry
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Abstract

A α-Fe2O3/SiO2 nanocomposite as aquathermolisys catalyst material at heavy oil has been synthesized and optimized by using  Salt-Assisted Spray Pyrolysis method. The α-Fe2O3/SiO2 nanocomposite is obtained by thermal decomposition from the precursor.  The precursor is made of FeCl3, SiO2 and NaCl and water as a solvent. Concentration of FeCl3, SiO2, and NaCl are 1:1:5 in order. the composition of SiO2 in the composite is 0%, 25% and 50% of total mass, respectively. the droplets were transported to the furnace reactor using air as a carrier gas with a fixed flow rate at 5 liter/min and the furnace’s temperature is 800 °C in order to get the pyrolysis reaction. The resulted powder is then characterized by using XRD, SEM and Chatalytic aquathermolysis test. The result of XRD characterization shows that crystal peaks of α-Fe2O3 has been formed. SEM result shows nanocomposite morphology of α-Fe2O3/SiO2 with circle particle form with average particle diametre of α-Fe2O3, SiO2 25% and SiO2 50% of total mass are 765 nm, 850 nm, and 746 nm, respectively. Catalytic Aquathermolysis test showed catalyst α-Fe2O3/SiO2 50%  has catalytic properties better than catalytic properties of α-Fe2O3/SiO2 and α-Fe2O3/SiO2 25%.
Pengembangan Material Sorben Berbasis Zeolite dan Clay Alam se-bagai Media Desalinasi Air Laut Wibowo, Edy; Rokhmat, Mamat; Sutisna, Sutisna; Khairurrijal, Khairurrijal; Abdullah, Mikrajuddin
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Abstract

We have developed a sorbent based natural materials for seawater desalination application. We used clays, soil, rock and zeolite as raw materials. We conducted a thermal activation process to improve the sorption ability of the materials. The sorption ability of materials were tested to reduce the salinity of seawater and it is expressed by the reduction efficiency. The highest reduction efficiency (4%) was obtained from the activation of the soil at temperature of 600 ° C and the zeolite at a temperature of 200 ° C. It can be seen that the reduction efficiency was linearly increased with the increase of the doses of sorbent. We observed that the sorption ability of zeolite can be enhanced through thermal activation at a relatively low temperature so that it was potentially used as a low-cost sorbent material for seawater desalination.
Pengaruh Penambahan SiO2 dan PTFE Terhadap Respon Termolumi-nesensi TLD CaSO4:Dy Nuraeni, Nunung; Kartikasari, Dewi; Iskandar, Ferry; Haryanto, Freddy; Waris, Abdul; Hiswara, Eri
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Abstract

Thermoluminescence response of TLD CaSO4: Dy with a variation of the addition of SiO2 and PTFE materials has been observed. TLD CaSO4:Dy derived through co-precipitation method and then added by SiO2 and PTFE. Thermoluminescence intensity for CaSO4:Dy added by SiO2 obtained 9.41, 5.32; and 13.93 nC for the temperature at 400 °C, 600 °C and 700 °C. As for CaSO4:Dy with the addition of PTFE obtained 33.10;  336.89; and 1191.11 nC for the temperature at 400 oC temperature, 600 °C and 700 °C. Thermoluminscence intensity for CaSO4:Dy without the addition of SiO2 and PTFE at a temperature of 700 °C is 75.15 nC. There’s a significant increasing in the thermoluminescence intensity on CaSO4:Dy added by PTFE.
Aktivitas Fotokatalitik TiO2 yang Dilapiskan pada Polipropilena Berbentuk Lembaran dan Butiran Sutisna, Sutisna; Rokhmat, Mamat; Wibowo, Edy; Rahmayanti, Handika Dany; Khairurrijal, Khairurrijal; Abdullah, Mikrajuddin
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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The sheet and granule of polypropylene (PP) have been used as the support material for TiO2 catalyst. The TiO2 powder was coated to the polymer surface using a combination of electrostatic and heating methods (for the PP sheet) and thermal milling method (for PP granule). The photocatalytic testing of catalysts conducted on a 300 ml solution of Methylene Blue (MB) with initial concentration of 25 ppm. Under solar ilumination, the catalyst sheets have a higher photocatalytic activity than the catalyst granules.
Sintesis dan Karakteristik Membran Komposit Akrilonitril Butadiena Stirena (ABS)-Kitosan Tersulfonasi untuk Direct Metanol Fuel Cell (DMFC) Hidayati, Nur; Mujiburohman, Muhammad; Abdillah, Hamid; Harmoko, Tri; Arimurti, Rizki Dyah
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Abstract

Direct Methanol Fuel Cell (DMFC) is a type of fuel cell that converts methanol directly into electrical energy. The commercialization constraints of fuel cells in Indonesia is due to the high cost of manufacturing, including the expensive electrolyte membrane which is one of the important components of fuel cells. Utilization of cheap and abundant local materials such as acrylonitrile butadiene styrene (ABS) and chitosan can reduce the fuel cell manufacturing cost burden. The membrane currently used for DMFC is the Nafion® membrane. The superiority of Nafion® membrane has high ionic conductivity and membrane stability, while Nafion® membrane deficiency is a very expensive price and has a high enough methanol permeability that can lead to a decrease in overall cell voltage performance. This study studied the characteristics of ABS-sulfonated Chitosan membrane membrane with ratio (20:80) and (40:60) prepared on 6-hour, 12 hour, 18 hour, 24 hour sulphonation time variation. The experimental results show a sulfonation time of 24 hours, in the ratio of ABS: Chitosan (20:80 wt) provides membrane characteristics such as water uptake 48.50%, swelling degree 25%, ion exchange chamber 2.030 meq / g, and methanol permeability 2,9336x10 -6 cm2 / s.
Pengaruh Oksidasi Setelah Deposisi Terhadap Sifat Film Tipis ZnO:Ga Faizal, Reza; Marwoto, Putut; Sulhadi, Sulhadi; Sugianto, Sugianto
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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The effect of after-deposition oxidation to the thin film properties Ga doped ZnO has been studied.  Film deposited using dc magnetron sputtering method at temperature 300oC for one hour and then it was performed variations of oxidation using oxygen gas (99,9%) with pressure of 0 mTorr and 50 mTorr at a temperature of 300 ° C for 20 minutes. According to the image scanning of electron microscopy, it shows that the film grain size became larger in oxygen pressure of 50 mTor as compared to the pressure of 0 mTor. UV-Vis spectrophotometer analysis showed the film transmittance in visible light increases with the increasing of oxygen pressure reached ~83%. Band-gap energy that has been produced by film on the oxygen pressure of 0 mTorr and 50 mTorr are respectively 3.32 eV and 3.4 eV.
Pengaruh Temperatur Solution Treatment dan Aging terhadap Struktur Mikro dan Kekerasan Copperized-AISI 1006 Sutarsis, Sutarsis; Vicky, Widia Anggia; Purwaningsih, Hariyati
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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As one of the alloying elements used in low carbon steel, copper can increase the strength of steel without lowering its ductility significantly. Copper increases the strength of steel by precipitation hardening. In this research, copper and AISI 1006 steel were alloyed by immersing the pre-heated steel into molten copper. After the imersion process, the precipitation hardening was performed with variations in temperature of solution treatment and aging. From the results of this study, it was found that the solution treatment temperature did not affect the phase of copperized-AISI 1006, but the aging process affected the formation of secondary phase. The increase of solution treatment temperature is proportional to the increase of copperized-AISI 1006 average grain diameter. In contrast, the use of aging temperature of 450oC obtained the smallest average grain diameter than others, in the amount of 49,23 μm and 50,26 μm for sample that previously being  solution treatment at 800 and 900oC. Besides, the increase of the solution treatment temperature is inversely  proportional to the hardness number of copperized-AISI 1006. However, the aging temperature of 450oC obtained the highest hardness number than other aging temperature, in the amount of 119,47 VHN and 115,75 VHN for sample that previously being solution treatment at 800 and 900oC.
Penentuan Kondisi Operasi Elektroplating Krom yang Ramah Lingkungan Perdana, Sanjaya Putra; Priambodo, Anton; Munarsyah, Tryas; Pustaka, Bagas Winagandi; Widayanto, Tri
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Abstract

Electroplating is a method of surface coating by using an electrolytic process. The technique was aimed to improve its corrosion resistance and to obtain an aesthetic and decorative appearance. In the experiments, metalic chrome was used to be electrodeposited on to copper substrates. A thin layer of electrodeposited chrome was expected to be on the surface of working electrode. The working electrode was copper plate (3 mm thickness) with a length of 2 cm and a width of 1 cm. Polarization experiments were carried out at various electrolyte concentrations of 5 g/l, 10 g/l and 15g/l. Electrolytes were prepared using chromium chloride because it is more environmentally friendly. Polarization experiments were carried out by applying potentials range between 0.1V ando 3.5V at intervals of 0.1 V. The electrical current responses were recorded so that polarization curves were obtained. Electrochemical parameters such as potential and current for electroplating were determined based on the polarization curves. The electrical currents used for electroplating experiments were 80% of  limiting current and the limiting current for  each concentration. The results of electroplating experiments were then analyzed using digital microscopy. The results obtained at a concentration of 5 g/l and 10 g/l show more uniform and smoother surfaces. Deposited chrome obtained at the concentration of 15 g/l was non uniform thickness. It can be concluded that a relatively good deposited chrome was obtained at the electrolyte concentration of 5 g/l at a current of 18.2 mA which shows more uniform and dense plated chrome.

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