Abdul Hapid
Pusat Penelitian Tenaga Listrik dan Mekatronik LIPI, Komp. LIPI Bandung, Jl Sangkuriang, Gd 20, Lt 2, Bandung, Jawa Barat 40135

Published : 36 Documents
Articles

Found 36 Documents
Search

IDENTIFIKASI PERUBAHAN MINERAL SELAMA PROSES PEMANASAN PELET KOMPOSIT NIKEL DENGAN ANALISIS DIFRAKSI SINAR X ( IDENTIFICATION OF MINERAL CHANGES DURING HEATING OF NICKEL COMPOSITE USING X-RAY DIFFRACTION ANALYSIS ) Permatasari, Nur Vita; Kawigraha, Adji; Hapid, Abdul; Wibowo, Nurhadi
Majalah Ilmiah Pengkajian Industri Vol 12, No 1 (2018): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/mipi.v12i1.479

Abstract

Logam nikel didapat dari proses pengolahan bijih nikel yang salah satunya adalah saprolit. Pada penelitian ini proses reduksi pelet komposit yang merupakan masa campuran bijih nikel serta batubara kadar rendah dan bahan tambahan dilakukan dalam tungku tabung. Proses reduksi dilakukan pada temperatur 450 °C, 700 °C serta 1100 °C selama 0 jam. Proses reduksi juga dilakukan pada temperatur yang lebih tinggi yaitu 1300 °C namun dengan pemanasan terlebih dahulu pada temperatur 700 °C dan ditahan pada 1 jam dan 2 jam. Produk pelet komposit dianalisis dengan metode difraksi sinar X untuk mengetahui kandungan mineralnya. Hasil menunjukkan bahwa pemanasan pelet komposit menyebabkan terjadinya perubahan warna dari warna coklat menjadi abu-abu. Pemanasan juga menyebabkan terjadinya perubahan komposisi mineral dari masing-masing pelet. Mineral-mineral yang terdapat dalam pelet komposit dan produknya adalah antigorit, klinoklor, kuarsa, enstatit, forsterit,gutit, hematit, magnetit, nikel dan besi. Pemanasan pelet pada temperatur rendah yang lebih lama akan menghasilkan jumlah logam besi yang lebih rendah. Nickel is obtained from saprolite through nickel ore processing. In this study, reduction of composite pellet has been done in a tube furnace. The pellet comsist of nickel ore, coal and additive. The reduction process carried out at 450˚C, 700˚C and 1100˚C for 0 hour. Moreover the reduction is also carried out at 700 °C during 1 and 2 hours followed by heating at 1300˚C for 2 and 1 hours. Reduction product was analyzed by X-Ray diffraction to determine the mineral content. The results indicate that the heating causing color changes from red brown to gray. Heating changes the mineral composition of the pellet. The minerals are antigorite, clinoclore, quartz, enstatite, forsterite, goethite, hematite, magnetite, nickel and iron. Heating the pellets at low temperature longer will produce lower iron.
Pengurangan Subsidi BBM dan Polusi Udara Melalui Kebijakan Program Konversi dari BBM ke BBG Untuk Kendaraan di Propinsi Jawa Barat Susanti, Vita; Hartanto, Agus; Subekti, Ridwan Arief; Saputra, Hendri Maja; Rijanto, Estiko; Hapid, Abdul
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 1, No 2 (2010)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/j.mev.2010.v1.43-52

Abstract

The  number  of  vehicle  that  use  oil  (BBM)  is  increasing  every  year  in  Indonesia  while  national  oil  reserve become smaller, so that the oil should be imported. The impact of using oil are increasing subsidy and air pollution.  Thus, it is now becoming important to replace oil with another environmentally friendly energy, one of them is gas (BBG). Based on the number of vehicle and infrastructure in gas pipeline, part of northern West Java potentially can  be  chosen  for  the  implementation  of  conversion  program  to  gas  (BBG).  The number  of  vehicle  in  potential regions  such  as  Depok,  Cibinong,  Bogor,  Bekasi,  Cikarang,  Karawang,  Purwakarta,  Cirebon,  and  Bandung  are around 875,505 units. From these data, we simulated the potential profit to be gained each year by converting 10% for the first year and increasing it to 5% for every year. By investing 3.16 trillion for conversion, 14.9 trillion can be achieved in  the  form  of  fuel  subsidy  savings.  In  addition,  emission  reduction  converted  to  a  CDM  (clean development  mechanism)  can  become  local  revenues.  Total CDM generated during 5 years predicted is of U.S $ 772,385. From this study, it can be concluded that converting oil (BBM) to gas (BBG) is highly beneficial. 
BENEFISIASI BIJIH BESI DENGAN PROSES FROTH FLOTASI Kawigraha, Adji; Sarnety, Sri; Hapid, Abdul; Yusuf, Akil
Jurnal Sciene dan Teknologi Vol 11, No 2 (2009): JURNAL SAINS DAN TEKNOLOGI INDONESIA
Publisher : Jurnal Sciene dan Teknologi

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Iron ore is one of important raw material for metal production. Indonesian iron ore has been separated from its impurities by froth flotation using pine oil and oleic acid as frothers. The result is compared by the same process using pH. The results show that Fe recovery will decrease with increasing pH and Fe recovery can beoptimised by using between 500 to 1250 g/t of oleic acid and 25 to 175 g/t of pine oil as reagent.
PENGARUH KONSENTRASI DAN LAMA PERENDAMAN BAHAN PENGAWET DAUN TEMBELEKAN (Lantana camara L.) PADA KAYU BAYUR (Pterospermum sp.) TERHADAP SERANGAN RAYAP TANAH (Coptotermes sp.) Salmayanti, Salmayanti; Ariyanti, Ariyanti; Hapid, Abdul
Warta Rimba Vol 1, No 1 (2013)
Publisher : Warta Rimba

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

There are about ± 4.000 wood species in Indonesia. In small amount of that woods were categorized as durable wood (Class I and II) while mostly (80-85%) were categorized non-durable wood (Class III to V). This study was aimed to determine the effects of Lantana camara L. leaves extracts as preservation material of Pterospermum sp wood on the Coptotermes sp. attacks. The experiment was conducted in the laboratory of Forestry science, Forestry Faculty, Tadulako University, from May to June 2013. The study was using completely randomized design with pattern. The treatment of study was applying two factors. First, concentration of L.camara L. extracts with three levels, namely ;9,09 g (K1), 13,04 g (K2), and 16,66 g (K3). Second, Dipping time with three levels, namely: 1 day (L1), 3 days (L3), and 5 days (L5). Data was analyzed by using analysis (Anova).The results showed that water contents and density of Pterospermum sp. woods was 8,37% and 0,321 g/cm³, respectively. Hence, the highest weight loss was achieved by K1L1 combination treatment (9,99%) while the lowest was achieved by K3L5 combination treatment (8,93%). Generally, concentration of L.camara L. and dipping time extracts did not affect significantly the weight loss of Pterospermum sp woods. Keywords: Concentration, Dipping, Lantana camara L., Pterospermum sp., Coptotermes sp.
PENGARUH KONSENTRASI DAN LAMA PERENDAMAN KAYU SENGON (Paraserianthes falcataria L. Nielsen) DALAM EKSTRAK DAUN SIRSAK (Annona muricata L.) TERHADAP SERANGAN RAYAP TANAH (Coptotermes sp.) Ardiansa, Budi; Ariyanti, Ariyanti; Hapid, Abdul
Warta Rimba Vol 2, No 1 (2014)
Publisher : Warta Rimba

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Wood has many contribution for life. It can be useful for bueldings, huose ware, and for other using. The use of wood are followed by huma needs for manufactured wood in creasingly, while long life wood tend to be more scarce and higher in price. This research aims to know the influence of the concentration and the immersion time for sengon wood treated in extracted soursop leaf to defence from subterranean termite. This research was conducted in both forestry Laboratorium, Departement and faculty of forestry, University of Tadulako and in rural of Baiya, Distict of Tawaely. Starting from Desember 2013 till Februari 2014. This research used a complete randomized factorial design. The first factor was the concentration of extracted soursop leaf (A) was 4.76% (A1), 13.04% (A2) and 16.66% (A3). The second factor was the immersion time for sengon wood treated in extracted soursop leaf (B) was 5 days (B1), 10 days (B2), and 15 days (B3). The results show that the highest of losing weight is in the control (A0B1) with 3.3%, and the lowest of losing weight is in the concentration of 150g with 10 days immersion (A1B2) with 1.21%. The concentration of extracted soursop leaf and the immertion time of sengon wood did not significantly influence to the lose of weight in tested sample. Keywords: Concentration, Dipping, Paraserianthes falcataria L. Nielsen, Annona muricata L, Coptotermes sp.
RETENSI BAHAN PENGAWET EKSTRAK DAUN TEMBELEKAN (Lantana camara L) PADA BEBERAPA JENIS KAYU DAN EFEKTIFITASNYA TERHADAP SERANGAN RAYAP TANAH (Coptotermes sp.) Riska, Riska; Erniwati, Erniwati; Hapid, Abdul
Warta Rimba Vol 2, No 2 (2014)
Publisher : Warta Rimba

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

High-grade durable wood could not be longer to meet the various needs, this caused by limited and the more expensive price, so it must use low grade durable wood. The use of low grade durable wood should be followed by the wood preservation process. This study aims to determine the preservative retention of leaves tembelekan (Lantana camara L) on bayur (Pterospermum sp), benuang (Octomeles sumatrana Miq) and durian (Durio zibethinzs) and its effectiveness against subterranean termites (Coptotermes sp), attack. It was conducted at the Laboratory of Agrotechnology, Faculty of Agriculture, University Tadulako in March to june 2014. Testing Subterranean termites (Coptotermes sp) test was carried out at the Maku Village, District of Dolo, Sigi Regency, Central Sulawesi, using a completely randomized design (CRD), with treatment of different wood species and 3 days soaking duration at a concentration of 1% preservative with 6 replications. The results show the moisture content of bayur, benuang and durian woods are 13,10%, 10,81% and 11,35% respectively. The wood densiy of bayur 0,480g/cm3, benuang 0,277 g/cm3 and durian 0,402g/cm3 and the highest retention values is found at wood of durian 59,09 g/cm3 and the highest retention values is at bayur 41,67 g/cm3. In addition, the highest weeight loss (leas effectiveness) of 15,02% on the wood of bayur (control) and the lowest (highest Effectiveness) on wood of benuang 0,72%. Key words: Leaf extract of tembelekan, Lantana camara L, Octomeles sumatrana Miq, Pterospermum sp, durio sibethinzs
EFEKTIVITAS BAHAN PENGAWET ALAMI DARI TANAMAN TEMBELEKAN (Lantana camara L) PADA BEBERAPA JENIS KAYU TERHADAP SERANGAN RAYAP TANAH (Coptotermes sp.) Safitri, Risky; Erniwati, Erniwati; Hapid, Abdul
Warta Rimba Vol 2, No 2 (2014)
Publisher : Warta Rimba

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Many favorable properties of wood are available in almost all parts of the world, easily obtained in different shapes and sizes, relatively easy to process, as well as very decorative appearance. However, wood also has a weakness that could be damaged by a variety of factors either biological, physical, mechanical or chemical. In reality, the main factors causing damage to the wood are fungi, bacteria, insects and marine animals (marine borer). The organisms might damage the wood because they make as a shelter or as feed. Therefore, there should be conducted wood preservation to overcome the unfavorable properties of the woods. Wood preservation aims to extend the use of low-class durability of timber species such as Bayur (Pterospermum sp), Durian (Durio zibethinus) and Benuang (Octomeles sumatrana Miq). This study aimed at determining the effectiveness of a natural preservative tembelekan (Lantana camara L). The research was conducted at the Forestry Sciences Laboratory, Department of Forestry, Forestry Faculty, Tadulako University and Talise Mantikulore Sub-district, started from May to July 2013. The study was designed with the method of completely randomized design (CRD) with three wood species treatment, namely bayur, durian and benuang. Each was preserved with a natural preservatives of tembelekan extract with a concentraation of 13,04%. There were 10 samples of each type of wood, consisting of 5 test samples preserved and 5 controls (without preserrvatives). There were 30 test samples. The parameters observed were preservative effectiveness of the sample weight after feeding on soil termites. The study shows that highest natural preservative effectiveness on benuang wood was preserved with the sample weight loss of 2,25% and the lowest on bayur wood was preserved with the sample weight loss of 3,47% when they were compared with the control sample (without preservative). Using tembelekan extract might increase wood resistance to soil termite attacks. Keywords: Captotermes sp, Durio zibethinus, Lantana camara L, Octomeles sumatrana Miq, tembelekan.
Evaluation of Potential Usage of Incremental-Type Rotary Encoder Application for Angle Sensing in Steering System Kaleg, Sunarto; Muharam, Aam; Kurnia, M. Redho; Hapid, Abdul
Journal of Mechatronics, Electrical Power, and Vehicular Technology Vol 5, No 2 (2014)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/j.mev.2014.v5.83-90

Abstract

The main target of a steering system is that the driver can change vehicle trajectory in accordance with the desired direction.  Power steering has become a standard feature in automobile.  It provides assisting power when the driver turns the steering wheel. The well-known power steering types include; Hydraulic Power Steering (HPS), Electro - Hydraulic Power Steering (EHPS), and Electric Power Steering (EPS). EHPS or EPS uses an Electronic Control Unit (ECU) which is specific for each vehicle. The ECU should be able to regulate power of electric motor to provide corresponding assisting power for the steering wheel. Therefore ECU requires input signals, one of which is vehicle wheel angle that can be indicated from the vehicle steering wheel angle. Incremental type of Rotary Encoder (RE) is used in steering angle sensor on a minibus. RE specification used was 60 pulses per rotation and the minibus steering transmission specification is 3.5 round of right wheel off angle to the left wheel off angle. So we get the RE angular resolution 6ºper pulse and 105 number of pulses to half of the steering transmission ratio. Repeatability then tested against to a steering angle counter module. Testing is done with a test cycle consisting of 3 repetitions: condition center of the steering wheel, the steering wheel is turned to full right, then to the full left, then back to the right up to the steering wheel center. The results obtained 2 pulses deviation, or equivalent to 12º of steering angle.
Pengurangan Subsidi BBM dan Polusi Udara Melalui Kebijakan Program Konversi dari BBM ke BBG Untuk Kendaraan di Propinsi Jawa Barat Susanti, Vita; Hartanto, Agus; Subekti, Ridwan Arief; Saputra, Hendri Maja; Rijanto, Estiko; Hapid, Abdul
Journal of Mechatronics, Electrical Power, and Vehicular Technology Vol 1, No 2 (2010)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/j.mev.2010.v1.43-52

Abstract

The  number  of  vehicle  that  use  oil  (BBM)  is  increasing  every  year  in  Indonesia  while  national  oil  reserve become smaller, so that the oil should be imported. The impact of using oil are increasing subsidy and air pollution.  Thus, it is now becoming important to replace oil with another environmentally friendly energy, one of them is gas (BBG). Based on the number of vehicle and infrastructure in gas pipeline, part of northern West Java potentially can  be  chosen  for  the  implementation  of  conversion  program  to  gas  (BBG).  The number  of  vehicle  in  potential regions  such  as  Depok,  Cibinong,  Bogor,  Bekasi,  Cikarang,  Karawang,  Purwakarta,  Cirebon,  and  Bandung  are around 875,505 units. From these data, we simulated the potential profit to be gained each year by converting 10% for the first year and increasing it to 5% for every year. By investing 3.16 trillion for conversion, 14.9 trillion can be achieved in  the  form  of  fuel  subsidy  savings.  In  addition,  emission  reduction  converted  to  a  CDM  (clean development  mechanism)  can  become  local  revenues.  Total CDM generated during 5 years predicted is of U.S $ 772,385. From this study, it can be concluded that converting oil (BBM) to gas (BBG) is highly beneficial. 
PENGARUH KONSENTRASI DAN LAMA PERENDAMAN BAHAN PENGAWET DAUN TEMBELEKAN (Lantana camara L.) PADA KAYU BAYUR (Pterospermum sp.) TERHADAP SERANGAN RAYAP TANAH (Coptotermes sp.) Salmayanti, Salmayanti; Ariyanti, Ariyanti; Hapid, Abdul
Jurnal Warta Rimba Vol 1, No 1 (2013)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

There are about ± 4.000 wood species in Indonesia. In small amount of that woods were categorized as durable wood (Class I and II) while mostly (80-85%) were categorized non-durable wood (Class III to V). This study was aimed to determine the effects of Lantana camara L. leaves extracts as preservation material of Pterospermum sp wood on the Coptotermes sp. attacks. The experiment was conducted in the laboratory of Forestry science, Forestry Faculty, Tadulako University, from May to June 2013. The study was using completely randomized design with pattern. The treatment of study was applying two factors. First, concentration of L.camara L. extracts with three levels, namely ;9,09 g (K1), 13,04 g (K2), and 16,66 g (K3). Second, Dipping time with three levels, namely: 1 day (L1), 3 days (L3), and 5 days (L5). Data was analyzed by using analysis (Anova).The results showed that water contents and density of Pterospermum sp. woods was 8,37% and 0,321 g/cm³, respectively. Hence, the highest weight loss was achieved by K1L1 combination treatment (9,99%) while the lowest was achieved by K3L5 combination treatment (8,93%). Generally, concentration of L.camara L. and dipping time extracts did not affect significantly the weight loss of Pterospermum sp woods. Keywords: Concentration, Dipping, Lantana camara L., Pterospermum sp., Coptotermes sp.