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PENGARUH SUHU TEMPER TERHADAP STRUKTUR MIKRO, KEKERASAN, DAN KETAHANAN AUS BAJA KARBON HQ 709 Surahman, Surahman
Jurnal Nosel Vol 3, No 1 (2014): July
Publisher : Jurnal Nosel

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Abstract

The use of carbon steel HQ 709 as gears, crank shaft, shaft, and engine components in addition to requiring hardness properties also require wear resistance and toughness properties. To get the properties of carbon steel with a combination of hardness, plasticity, ductility, strength, wear resistance, and stable crystalline structure necessary tempering process. Tempering is an attempt to reduce the residual stress of materials with a decrease hardness material. The purpose of the study were : to investigate how the effect of tempering temperature variations to changes in the carbon steel microstructure HQ 709, to investigate the effect of tempering temperature variation to changes in carbon steel hardness HQ 709, to investigate the effect of tempering temperature variation to changes in wear resistance of carbon steel HQ 709, to investigate the interaction between changes in the microstructure, hardness and wear resistance due to the tempering temperature variations. Research using experimental methods and techniques of data analysis using descriptive analysis is to directly observe and then experimental results and determine the results of the study concluded. Based on the results of the study concluded that: there is the effect of tempered temperature variations on the microstructure of steel HQ 709, there is the effect of tempered temperature variation of the hardness levels steel HQ 709. Based on the results of hardness testing, heat treatment specimens obtained average level of the highest hardness at 870 ° C quenched specimens with holding time is 30 minutes for 560.97 VHN and the lowest average hardness of the specimen tempering 650 ° C with a holding time of 30 min 287.4 VHN, there is the effect of tempered temperature variations on the wear resistance of steel HQ 709. Based on the results of testing the wear resistance, heat treatment specimens obtained an average rate of wear of the highest numbers of specimens tempered at 650 ° C with a holding time 30 min at 0.873 × 10-7 mm2/Kg and the average wear rate lowest in quenching the specimen 870 ° C with a holding time of 30 minutes 0.3 × 10-7 mm2/Kg, there is an interaction between changes in the microstructure, hardness, and wear resistance of steel 709 HQ. Such changes have a certain pattern of interaction or relationship.
Teori Komunikasi dalam Perspektif Mazhab Frankfurt Surahman, Surahman
Mediator Vol 6, No 1 (2005): Kontroversi Dakwah dan Politik
Publisher : FIkom Unisba

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Frankfurt School of Thought, which rooted in Marxism and Critical paradigm, provided many ways to interpret the meaning of communication. This school of thought is primarily based on the main tenets of Critical Theory, i.e. totality, consciousness, anomie, and critic. Some questions arise concerning the ontology, epistemology, and axiology dimensions of Frankfurt School of Thought. Ontology discussion concerning the nature of communication involved an intensive outlook of Giddens’s Structuration Theory. Epistemology involved a discussion with Gramscian concepts of hegemony. Meanwhile, the problem of axiology is best addressed in Habermas fashion of agent-structur-dialectics.
TERORISME SEBUAH ANATOMI KEKERASAN DENGAN EGO SUPERIOR SEKALIGUS KETAKUTAN Surahman, Surahman
Academica Vol 3, No 1 (2011)
Publisher : Academica

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jika dialog mengalami dehumanisasi, kemungkinan akan terjadinya tindakan dan sikap anarkis semakn terbuka, dimana peluang gerakan teror (terorisme) terbuka lebar. gerakan teror memiliki peluang lahir dari kelompok manapun, baik dari kaum fundamental atau liberalis. Sehingga yang dibutuhkan adalah konstruksi peradaban yang berpihak pada ide universalisme dimana Athena dam Oikos,meminjam istilah aristoteles bukan dua ruang berbeda, tetapi ia menyatu dalam institusi yang saling mengisi sehingga Athena, bukan sekedar lembaga negara, ia lebih merujuk pada pemaknaan sebagai kelembagaan sosial yang melindungi hak-hak warga (oikos), Sehingga makna kekuasaan sebagaimana kata Weber sebagai “setiap peluang untuk memaksakan kehendak sendiri dalam sebuah hubungan sosial juga kalau kehendak itu ditentang”. Kita tolak sebab menyebabkan kita terjebak pada semangat otoritarian kekuasaan. Kita perlu membangun model integrasi yang memungkinkan orang berproses meruntuhkan ego kemanusiaannya, Integrasi yang dimaksud adalah : integrasi sosial dan integrasi sistem.Kata Kunci: Terorisme, Kekerasan dan Ego Superior
Meningkatkan Hasil Belajar Siswa Dalam Pembelajaran IPA Pokok Bahasan Makhluk Hidup Dan Proses Kehidupan Melalui Media Gambar Kontekstual Pada Siswa Kelas II SD Alkhairaat Towera Surahman, Surahman; Paudi, Ritman Ishak; Tureni, Dewi
Jurnal Kreatif Tadulako Online Vol 3, No 4 (2015): Jurnal Kreatif Tadulako Online
Publisher : Jurnal Kreatif Tadulako Online

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Permasalahan pokok pada penelitian ini adalah kurangnya minat dan motivasi siswa untuk  belajar IPA. Akibatnya, siswa tidak senang belajar sehingga hasil belajar siswa rendah. Untuk mengatasi permasalahan di atas maka peneliti menerapkan metode pembelajaran menggunakan media gambar kotekstual. Metode ini berpengaruh positif sehingga dapat meningkatkan hasil belajar siswa. Penelitian ini dilaksanakaan dikelas II SD Alkhairaat Towera tahun pelajaran 2013/2014 dengan subyek penelitian seluruh siswa kelas II. Tujuan utama penelitian ini adalah untuk mengetahui penerapan media gambar kontekstual terhadap peningkatan hasil belajar siswa kelas II Sekolah Dasar Alkhairaat Towera pada mata pelajaran IPA pokok bahasan Makhluk Hidup dan proses Kehidupan. Sehingga rumusan masalah dalam penelitian ini adalah apakah penerapan media gambar kontekstual dapat meningkatkan hasil belajar siswa kelas II Sekolah Dasar Alkhairaat Towera pada mata pelajaran IPA pokok bahasan Makhluk Hidup dan Proses Kehidupan?. Pada pelaksanaan tindakan siklus satu pertemuan pertema dan kedua diperoleh aktivitas guru 60% dan 63,3% dan ativitas siswa 62,5% dan 70% ini menunjukkan bahwa altivitas guru dan siswa dalam pelaksanaan tindakan siklus satu berada pada kategori kurang, persentase ketuntasan belajar klasikal siklus satu sebesar 46,6%, berdasarkan nilai ini dapat dikatan bahwa siswa belum tuntas secara klasikal dan penelitian belum dikatakan berhasil sehingga perlu dilanjutkan pada pelaksanaan siklus dua. Pada pelaksanaan siklus dua aktivitas guru dan siswa mengalami peningkatan dimana aktivitas guru pada ppertemuan pertama dan kedua pada siklus dua 80% dan 88,3%, sedangkan antkvitas siswa 80% dan 90% yang menunjukkan aktivitas guru dan siswa berada pada kategori baik. Dengan membaiknya aktivitas guru dan aktivitas siswa, membuat hasil belajar siswa menjadi meningkat, terlihat dari persentase ketuntasan belajar klasikal pada siklus dua yaitu 80%, ini menunjukkan bahwa penelitian tindakan kelas yang dilakukan pada siklus dua telah berhasil, sehingga dapat dikatakan penerapan media gambar kontekstual, dapat meningkatkan hasil siswa pada pelajaran IPA siswa kelas II Sekolah Dasar Alkhairaat Towera. Kata Kunci: Hasil Belajar,Makhluk Hidup, Proses Kehidupan, Gambar Kontekstual
TEORI KOMUNIKASI DALAM PERSPEKTIF MAZHAB FRANKFURT Surahman, Surahman
MediaTor (Jurnal Komunikasi) Vol 6, No 1 (2005): Kontroversi Dakwah dan Politik
Publisher : Pusat Penerbitan Universitas (P2U) LPPM Unisba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29313/mediator.v6i1.1182

Abstract

Frankfurt School of Thought, which rooted in Marxism and Critical paradigm, provided many ways to interpret the meaning of communication. This school of thought is primarily based on the main tenets of Critical Theory, i.e. totality, consciousness, anomie, and critic. Some questions arise concerning the ontology, epistemology, and axiology dimensions of Frankfurt School of Thought. Ontology discussion concerning the nature of communication involved an intensive outlook of Giddens?s Structuration Theory. Epistemology involved a discussion with Gramscian concepts of hegemony. Meanwhile, the problem of axiology is best addressed in Habermas fashion of agent-structur-dialectics.
ANALISIS KEKUATAN DINAR DAN DIRHAM SEBAGAI MATA UANG ANTI KRISIS SURAHMAN, SURAHMAN
JEBI (Jurnal Ekonomi dan Bisnis Islam) Vol 1, No 2 (2016): Juli - Desember 2016
Publisher : Universitas Islam Negeri Imam Bonjol Padang

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The theme of the article is based on economic principles Islam. The purpose of this research is to analyze the strength of the dinar and dirham as an anti-crisis currency. Research is the study of literature. In Islamic Economics which became the currency as a medium of exchange is the dinar and dirham. Money is a medium of exchange for the unit of measure of goods and labor. Since the implementation of a paper currency that is not no standardization of the value of gold and silver, led to the financial crisis. Dinar and Dirham has the power of being able to buy a wide range of commodities, thus making resistant to inflation. Dinar and dirham can be used by all countries in the world to be a medium of exchange, be it trade within the country and abroad.
THE GROWTH OF JABON (ANTHOCEPHALUS CADAMBA ROXB. MIQ.) IN LESS OPTIMUM ENVIRONMENT AND ITS RESPONS TO FERTILIZER APPLICATION Mansur, Irdika; Surahman, Surahman
Jurnal Silvikultur Tropika Vol. 2 No. 2 (2011): Jurnal Silvikultur Tropika
Publisher : Departemen Silvikultur, Fakultas Kehutanan, Institut Pertanian Bogor (IPB)

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Abstract

Jabon (Anthocephalus cadamba Roxb. Miq.) is one kind of industrial tree that grows fast (fast growing species), as a producers of wood to meet the demands of Indonesian timber which continues to increase. In the 70's 100% wood industry in Indonesia only rely on natural forests as a source of supply. The rate of degradation natural forests continues to increase causing sharply reduced timber supply. Jabon is one kind of superior wood that can be developed through Industrial Plantation Forest and the Community Forest. However, the silviculture information in its development is still limited, especially the profit of advanced fertilization and selection area. The aim of this study was to determine the growth of jabon in less optimum environment (poor drainage and under shade conditions), to determine the influence of fertilizer application on the growth of jabon and to get the optimum dose of fertilizer application.
IMPLEMENTASI PEMERINTAH KOTA DEPOK DALAM UPAYA MENINGKATKAN EKONOMI MASYARAKAT MENURUT PASAL 33 DALAM UUD’45 Novita, Evi; Surahman, Surahman; Damayanthi, Dessy
Al-Kharaj : Jurnal Ekonomi, Keuangan dan Bisnis Syariah Vol 2 No 3 (2020): Al-Kharaj: Jurnal Ekonomi, Keuangan & Bisnis Islam
Publisher : Research and Strategic Studies Center (Pusat Riset dan Kajian Strategis) Fakultas Syariah IAI Nasional Laa Roiba

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Abstract

ABSTRACT The study aims to find out how the city government implementation developent of depok in an effort to boost the public economy according to article 33 of 1945 of Islamic studies. The writer wants to know some factors that are an impediment and success in the Depok city?s efforts to boost the economy is good. The method of research is using a qualitative method, as for this research instrument is an interview, observation, documentation, a printed purpose associated with the title of the thesis that then gained a validity of the data. From the data gathered on the results of the study above. Thus the write concluded that the separate town of Depok from the town of Bogor was in the economic structure, development, transportation, education, natural resources and human resources and technology can flourish well. Keyword: development, research, economic structure
Populasi Bakteri Antagonistik terhadap Fusarium sp. dari Rizosfer Lada Sehat dan Sakit Kuning Suwandi, Suwandi; Mazid, Abdul; Surahman, Surahman
Jurnal Perlindungan Tanaman Indonesia Vol 7, No 1 (2001)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9574.309 KB) | DOI: 10.22146/jpti.10022

Abstract

Populations of antagonistic bacteria colonizing rhizosphere of diseased and healthy black pepper plants were compared to explore the biocontrol function of these populations on yellow disease of black pepper. As many as 180 isolates (equivalent to population of 1.8 x 1010 cfu/g fresh weight of root) were randomly selected and tested for their antagonistic activities against Fusarium sp., a pathogen of yellow disease. To characterize the populations, the isolates were tested for their fluorescent and Gram reaction. There was an evidence of significant association between antagonistic activities and the disease incidence. We found the significant larger proportion of antagonistic bacteria from the rhizosphere of healthy black pepper, whereas no significant difference between proportion of antagonistic and non-antagonistic population from yellow disease-affected rhizosphere. Populations of antagonistic bacteria were dominated by the population of non-fluorescent Gram-negative. Most of the fluorescent populations were antagonistic to Fusarium sp.Key words: biocontrol, rhizobacteria, yellow disease
PELAYANAN PEMERINTAH KOTA DEPOK DALAM MENERBITKAN IZIN MENDIRIKAN BANGUNAN (IMB) TAHUN 2012-2014 Surahman, Surahman
KENEGARAAN Vol 1, No 2 (216): Volume 1 Nomor 2 Tahun 2016
Publisher : Sekolah Pascasarjana UNAS

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Service function in the governance of an area is an absolute must to empower the community, it is becoming an important key in managing good governance (goodgovernance) with the basic principles of effective, efficient, transparent and accountable, would be the basis for taking a policy community development, local governments shouldbe able to involve the public directly from the planning, management and supervision, the public wrapped facilitate the attainment of the objectives of decentralization itself. Theresearch proves that government services Depok in issuing IMB residence on Investment Board and Licensing Services (BPMP2T) not running optimally, the indicator communityspirit to make the IMB is still very low, there are still many obstacles in the process of implementation and the persistence of rogue officers take the opportunity to receive a reward of making pictures of the building / process IPR misunderstanding in this case because the community and the communitys own desire to be completed more quickly. Hospitality, care and concern public service workers is becoming very important to note.Attendant care and concern that can be proved with a firm stand indiscriminately or notselective to the rules that apply in this case is the maintenance of IMB in BPMP2T Depok. In addition, the chain of bureaucracy that must be passed by the community in the management of IMB extremely consume energy and time. With these conditions, then according to the authors of these factors also contribute less orderly IMB services at the field level. Keywords: IMB