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KAJIAN MEKANIS PENGGUNAAN PENGHANTAR TERMAL ACCR PADA SUTET 500KV Suprihadi Prasetyono
MAKARA Journal of Technology Vol 11, No 1 (2007): April
Publisher : Directorate of Research and Community Engagement, Universitas Indonesia

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Abstract

Mechanical Study on using of ACCR Thermal Conductor at 500 kV SUTET. At the height of electricity demandincreasing recently, circumstance of environment more limited and also expense of high investment, making thermalconductor (conductor thermal resistance) considered to be one of alternative in the electricity transmission bottlenecks.These days it has been developed thermal conductor ACCR (Aluminium Conductor Composite Reinforced) which canoperate with temperature up to 240oC, so that making the current carrying capacity being higher than conventionalconductor. This research aimed to study load current leading to mechanical characteristic ACCR conductor includedtension, length of elongation and sag of conductor. Its expected to be good for develop in construction structure oftransmission line which is appropriate to ACCR conductor characteristic. Based on this research it can be concludedthat application of ACCR conductor improves transmission line capacities by 100 % on existing ROW and tower.Keywords: Mechanical performance, Transmission line, ACSR and ACCR.
MIX CULTURE INOCULANT PRODUCTION OF PHOSPHATE SOLUBILYZING AND INDOLE ACETIC ACID (IAA) PRODUCER RHIZOBACTERIA WITH AMBARAWA PEAT SOIL RAWAPENING AS CARRIER Raharjo, Budi; Suprihadi, Agung
JURNAL SAINS DAN MATEMATIKA Volume 18 Issue 2 Year 2010
Publisher : JURNAL SAINS DAN MATEMATIKA

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ABSTRACT---Plant production development  is the main goals  that do for increase the farming quality to fulfill the man needed  in  food. One of the ways is intensive farming, by using organic or inorganic  fertilizer. Phosphate is the essential  for plants. IAA is the necessary plant regulator for the root. Both phosphate  and IAA need in  plant  growing  and production.  Biological  fertilizer  is  fertilizer  with  microbial  as the main material. Bacillus sp.DUCC-BR-K1.7, Bacillus sp. DUCC-BR-KI3, Bacillus sp.DUCC-BR-KI.2b  and Pseudomonas fluorescens, Azotobacter chroococcum, Azotobqcter vinelandii, Azospirillum sp. and Azotobacter brazilensis are bacteria that can solubilization  the phosphate  and IAA  synthesize.  Those bacteria can be used as  inoculants or biological  fertilizer  that put on carrier. One way to support  the aim is giving  the altemative carrier with  suitable composition. The carrier should be support bacterial life  during the storage.  The aim ofthis  research  is find  ths right  consortia so can be used to optimized  viabilities  of  culture Bacillus  sp. DUCC-BR-KIJ,  Bacillus sp. DUCC-BR-K1.3, Bacillus sp. DUCC-BR-KI.2b, P. flourescens, A. chroococcum, A. vinelandii, Azospirillum  sp., and  A. brazilensis in mix  culture  on peat soil  as carrier. This research done in Microbiology Laboratory of Biology Department Diponegoro University. Subculture and activated culture in Nutrient  Broth medium, make the growth curve to the biomass production, make the inoculums, prepare the peat soil, biomass production and mixed biomass with  the carrier, enumeration bacterial culture viability  test in carrier during the storage  by TPC method.  The  results  show  that  all  consortia  culture  bacteria viabiliry Bacillus  sp. DUCC-BR-KI.3  with Azospirillum (A) and Bacillus  sp. DUCC-BR-K1.7, with P.  flourescens (B)  still viable and increasing number of population during seven weeks storage with  l0 t-n CFU/g at To and up to  l0 r3-ro CFU/g at  the end storage. The  consortium  C  between Bacillus  sp.  DUCC-BR-KI.2  b  and A-  brssilensis  increasing  the  number  of population  and  still viable during eight weeks  storage  (1013  - 1014  CFU/g).Key words: biofertilizer, peat soil, viability,  mix cultare, consortiumPermalink : http://ejournal.undip.ac.id/index.php/sm/article/view/3138
The Paradox of Question and Answer Episode of Thesis Examination Suprihadi Suprihadi
TEFLIN Journal: A publication on the teaching and learning of English Vol 15, No 2 (2004)
Publisher : TEFLIN

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The main concern of this research is the exploration of tendencies made by the participants of a thesis examination in enacting their roles through their speech function choices. Interpretation of the data is based on the principle of critical discourse analysis within the systemic functional linguistic. The results show us the paradox of a Question – and – Answer episode of a thesis examination. It lies in the fact that it must operate in an academic atmosphere, be brief and frightening, and the examiners initiate the interaction by demanding information from the student, and yet it is a joint production of conversation in which, while enacting their supportive roles, the examiners contribute to sustaining the interaction, making it half-way between casual and pragmatic conversation. Based on the findings: some suggestions addressed to examiners are made.
TEST-TAKING STRATEGICNESS IN OPEN BOOK TESTS Suprihadi Suprihadi; Thomas Baharuddin Assyarofi
TEFLIN Journal: A publication on the teaching and learning of English Vol 22, No 2 (2011)
Publisher : TEFLIN

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Perception about testing and preparation to take a test is usually actualized in what the students do before, during, and after testing. This research involves 50 students and 17 lecturers as respondents, and uses structured questionnaire as its instrument. The results of the analysis show that: 1) the test-taking strategy used by the students of Education Department, the University of Muria Kudus (EED UMK) in open book tests is fair, 2) in α .01 and df 15, there is a significant dependency relationship between students grade and test-taking strategy use in open book tests although there is no exact relationship nature between these two variables.
Pengaruh Kecepatan Angin pada Karakteristik Performansi Konduktor SUTET Prasetyono, Suprihadi
e-Jurnal Arus Elektro Indonesia Vol 1, No 1 (2015)
Publisher : e-Jurnal Arus Elektro Indonesia

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AbstractWind speed changes at SUTET conductor besides having coolingeffects it also improves the transmission line capacities and will giveinfluence to conductor performances. This research aimed to knowthe influence of the wind speed to performance conductorcharacteristics such as temperature, tension, length, sag andcurrent carrying capacity of conductor. As simulation model, anextra high voltage transmission line 500kV Paiton – Kediri span no10 is used. Temperature of Conductor is calculated based on hotbalanceequation, whereas Catenary method and Rulling spanmethod used to determine sag conductor and length. The result ofcalculation shows, that the wind speed can be used to coolconductor with the range from 1 - 3 degree of celcius each for everyincrease of wind speed for 0,5 m / s. While conductor mechanicalcharacteristics such as tension, length, and sag does not having anysignificant changes.Keyword : Mechanical performance, Transmission line, Conductor.
Perancangan Simulasi Unjuk Kerja Motor Induksi Tiga Fase Dengan Sumber Satu Fase Menggunakan Boost Buck Converter Regulator Dan InverterTiga Fase Pulse Width Modulation (PWM) Menggunakan Software Matlab Islamy, Alexander Aqui; Hardianto, Triwahju; Prasetyono, Suprihadi
BERKALA SAINSTEK Vol 2, No 1 (2014)
Publisher : My Home

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Motor induksi merupakan motor yang paling banyak digunakan dalam dunia industri karena mempunyai beberapa kelebihan yaitu perawatan yang sederhana, memiliki struktur yang kokoh, harga yang relatif terjangkau dan mudah didapat dipasaran. Pengoprasian motor induksi tiga fase dengan sumber satu fase menjadi pilihan yang sangat baik untuk keaadaan dimana sumber tiga fase tidak tersedia. Tegangan nominal pada sumber satu fase adalah 220 volt, jika menggunakan motor induksi tiga fase dengan tegangan nominal 380 volt maka dibutuhkan boost buck konverter untuk menaikkan tegangan dari sumber satu fase dan control PI untuk mengontrol tegangan dalam merespon perubahan beban pada motor induksi. Proses konversi tiga fase menggunanakan inverter pulse width modulation. Simulasi unjuk kerja pada motor induksi dalam penelitian ini menggunakan matlab R2010b dengan spesifikasi motor 5 HP, 380 volt 50 Hz 1500 rpm. Hasil simulasi diperoleh nilai faktor daya saat terhubung dengan sumber satu fase saat tanpa beban 0,0925 dan saat beban nominal 0,8259. Hasil dari efisiensi rata – rata sebesar 89,64% pada saat motor terhubung dengan sumber satu fase lebih besar dari saat motor terhubung dengan sumber tiga fase yaitu 89,22%. Kata kunci : motor induksi, boost buck konverter, PI controller, inverter pulse width modulation.
Mechanical Study on using of ACCR Thermal Conductor at 500 kV SUTET Prasetyono, Suprihadi
Makara Journal of Technology Vol 11, No 1 (2007)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (220.308 KB) | DOI: 10.7454/mst.v11i1.126

Abstract

At the height of electricity demand increasing recently, circumstance of environment more limited and also expense of high investment, making thermal conductor (conductor thermal resistance) considered to be one of alternative in the electricity transmission bottlenecks. These days it has been developed thermal conductor ACCR (Aluminium Conductor Composite Reinforced) which can operate with temperature up to 240oC, so that making the current carrying capacity being higher than conventional conductor. This research aimed to study load current leading to mechanical characteristic ACCR conductor included tension, length of elongation and sag of conductor. Its expected to be good for develop in construction structure of transmission line which is appropriate to ACCR conductor characteristic. Based on this research it can be concluded that application of ACCR conductor improves transmission line capacities by 100 % on existing ROW and tower.
PEMANFAATAN POTENSI SUMBER AIR PANAS DI BLAWAN BONDOWOSO SEBAGAI PEMBANGKIT LISTRIK ALTERNATIF BERBASIS TEC Khalily, Jamaluddin; Prasetyono, Suprihadi; Kaloko, Bambang Sri
Jurnal Arus Elektro Indonesia Vol 2, No 1 (2016)
Publisher : Jurnal Arus Elektro Indonesia

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Indonesia menyimpan potensi energi terbarukan yakni geotermal berupa sumber air panas. Salah satu daerah yang berpotensi dalam pemanfaatan air panas untuk dijadikan pembangkit listrik berada di Blawan Bondowoso. Dalam penelitian ini, TEC dialih fungsikan sebagai pembangkit listrik tenaga panas / TEG (thermoelectric generator) yang menggunakan efek Seebeck. Digunakan 9 buah TEC berdimensi 4x4cm yang dirangkai secara seri, dengan bahan berupa Bi2Te3 (Bismuth telluride) sebagai alat bantu pengambilan data. Sumber air panas di Blawan memiliki temperatur pada kisaran 45-49,5 °C. Pengambilan data potensi dilakukan selama 3 hari yakni 21-23 Agustus 2015. Pukul 9:00–15:00 WIB, dengan pencatatan keluaran data potensi setiap selang 30 menit. Tercatat VTEG tertinggi dimiliki hari ke-2 sebesar 4,506 V pada pukul 9:00 WIB dan VTEG terendah dimiliki hari ke-1 sebesar 2,001 V pada pukul 13:30 WIB. Variasi besar arus tercatat pada angka 0,04 A dan 0,03 A, namun rata-rata stabil pada 0,03A. Daya tertinggi yang dicapai pada ketiga hari sebesar 0,48 Watt, dan daya terendah dicapai pada hari pertama sebesar 0,07962 Watt.
Karakterisasi Biodegradasi Senyawa Poliaromatik Dibenzothiophene Oleh Bakteri Laut Novosphingobium mathurense LBF-1-0061 Tanjung, Puspasari Noerwan; Yetti, Elvi; Thontowi, Ahmad; Suprihadi, Agung; Purwantisari, Susiana; Yopi, Yopi
JURNAL BIOLOGI INDONESIA Vol 12, No 2 (2016): JURNAL BIOLOGI INDONESIA
Publisher : Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1056.931 KB) | DOI: 10.14203/jbi.v12i2.2894

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ABSTRACTDibenzothiophene is one of polycyclic aromatic hydrocarbon (PAH) compound containing sulfur element. This compound has toxicity, mutagenic and quiet persistent in environment. From sreening test, it was known that isolate LBF-1-0061 was potential to degrade dibenzothiophene. The objectives of this study are to study dibenzotiophene degrading capability by marine bacteria isolate LBF-1-0061 using screening test; analysis of dibenzothiophene residue by GC/MS and identifiy the isolate by molecular identification. The result of this research shown that LBF-1-0061 isolate could grow up to 100 ppm of dibenzotiophene. This isolate also presented degrading capability approximately 37.5% of dibenzotiophene in 14 days incubation. Based on partial 16S rRNA gene analysis, LBF-1-0061 was identified 99% as Novosphingobium mathurense strain SM117.Keywords: sea bacteria, biodegradation, dibenzotiofen, hydrocarbon aromatic polisiclic
Isolasi dan Karakterisasi Bakteri Endofit Pelarut Fosfat dan Penghasil Hidrogen Cyanide (HCN) dari Tanaman Bawang Merah (Allium cepa L). Wandita, Ryan Hilda; Pujiyanto, Sri; Suprihadi, Agung; Hastuti, Ratih Dewi
Bioma : Berkala Ilmiah Biologi Vol. 20, No. 1, Tahun 2018
Publisher : Departemen Biologi, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (137.607 KB) | DOI: 10.14710/bioma.20.1.9-16

Abstract

Onions (Allium cepa L.) is one of the leading horticultural commodities in Indonesia and is often used as seasoning and traditional medicine. Onion has a high economic value and fluctuating prices so that domestic onion production needs to be improved, one of them with a presence of endophytic bacteria that act as plant growth promoting agent or Plant Growth Promoting Bacteria (PGPB). Endophytic bacteria isolated from the root, leaves, and bulbs. In this research has been tested endophytic bacteria of onion plants from Garut regency which has PGPB factors such as able to dissolve phosphate, and produce HCN. The results obtained 251 isolates of endophytic bacteria. Based on the characterization results, the superior isolates capable of dissolving phosphate with an average diameter of 0.45 cm is isolate II.B.1D.3, and 11 isolates capable of producing high HCN. These isolates can be used as PGPB agents so that they can be useful in increasing plant growth and onion production and biocontrol in suppressing pathogens. Keywords: PGPB, endophyte, onion, phosphate, HCN