40 research outputs found
Book Review of Unni Wikan, In Honor of Fadime: Murder & Shame. Translated by Anna Paterson.
Full text linkThe writer Unni Wikan, a Norwegian by nationality is a social anthropologist who has worked at various universities a professor of social anthropology. Wikan has also worked as a consultant with international organisations such as United Nations International Children's Emergency Fund (UNICEF) and the World Food Program (WFP).
In this book, the author tried to explore Fadime’s (a Swedish girl of Turkish origin) honour killing case under the light of different socio- cultural traditions and immigration issues. Honour killing is one of an extreme act of violence against women which highlights their subordinated position within patriarchal societies. Since last few decades Anthropologists, social scientists, journalists and NGO’s in different parts of the world have started to raise this issue seriously through exploring case studies, writing books, articles and several projects
Effect of current and travel speed variation of TIG welding on microstructure and hardness of stainless steel SS 316L
No full textThe Effect of Solution Treatment Temperature and Quenching Media Variation in Heat Treatment Process Cu-Zn-Al Shape Memory Alloys on Shape Memory Effect and Microstructures
Full text linkShape memory alloys (SMAs) are metal alloys with a reversible ability to recover their shape at a certain temperature after being deformed. This ability referred to as Shape Memory Effect (SME). The application of SMAs such as Ni-Ti and Cu-Zn-Al alloys usually used on automotive, biomedical, etc. The commonly used SMA is Ni-Ti because of its superior SME properties than Cu-Zn-Al, even though the price is quite higher. The SME of Cu-Zn-Al might be improved by increasing the presence of the martensite phase in its microstructure by heat treatment. The heat treatment process given to Cu-21Zn-5Al alloy is a homogenizing, annealing, solution treatment process and quenched with brine solution and dry ice. The heat-treated alloys then undergo several examination trough hardness tests, X-Ray Diffraction, metallography, SME test, and Differential Scanning Calorimetry to determine the SME and microstructure of Cu-21Zn-5Al. From the test results, the specimen with temperature treatment solution of 850oC and quenched by brine solution had the highest SME value by 36.67%. All of the microstructure contained α, β, (martensite) and γ phases
Analisa Kecepatan Pengelasan dan Kecepatan Putar Mata Pahat terhadap Konduktivitas Listrik Sambungan Aluminium dan Tembaga Hasil Friction Stir Welding (FSW)
Full text linkThe tool pin rotational speed and welding speed affect the electrical conductivity value of the Al-Cu connection. Al-Cu connection is a butt joint resulting from the friction stir welding (FSW) process. The material used is Al 6061 and pure copper. The friction stir welding (FSW) process uses a pin tool with a pin design that integrates with the pin tool and a three-degree angle. The purpose of this study was to determine the electrical conductivity value of the Al-Cu connection with the friction stir welding (FSW) process at the butt joint connection. The variables used in this study were pin tool rotation speeds of 800, 1000, and 1250 RPM and welding speeds of 10, 12.5, and 16 mm/min. Tests conducted in this study were macro structure testing, measurement of resistance values, and microhardness testing. Besides, an analysis of heat input and welding time is needed for each variable. The results of macro and XRD structure test results show that in the aluminum and copper connection, there are intermetallic compounds in the form of AlCu and Al2Cu. The results of the analysis state that the welding results with a welding speed of 12.5 mm/min are the most optimum variables. The welding process results in conductivity values ranging from 27.173 mΩ-1mm-2 and 28.09 mΩ-1mm-2. The presence of intermetallic compounds affects the conductivity value of the connection
Analisis Pengaruh Variasi Temperatur dan Waktu Tahan Tempering Terhadap Kekerasan Material Chain Shackle yang di-Hardening sebagai Solusi Kegagalan pada Chain Shackle
No full textPengaruh Variasi Holding Temperature dan Holding Time Pada Post Weld Heat Treatment Terhadap Struktur Mikro dan Distribusi Kekerasan Hasil Pengelasan Bisclad 600 dengan Metode SMAW di PT. Holcim Indonesia
No full textEffects of short immersion time and cooling rates of copperizing process to the evolution of microstructures and copper behavior in the dead mild steel
No full textAnalisa Pengaruh Variasi Arus terhadap Kualitas Sambungan Hasil Pengelasan GTAW pada Material SA 266 Gr 2N with Clad Inconel 625 (Tube Sheet) dengan SA 213 TP 304 (Tube)
No full textKajian Dan Peningkatan Akurasi Penilaian Risiko Dengan Integrasi Best Worst Method Dalam Risk-Based Inspection Semi-Kuantitatif Pada Sistem Fuel Gas
No full textIntegritas aset merupakan aspek krusial dalam industri minyak dan gas untuk menjaga operasi yang aman dan efisien. Salah satu metode efektif dalam pengelolaan risiko adalah Risk-Based Inspection (RBI) yang memprioritaskan inspeksi pada peralatan berisiko tinggi. Namun, pendekatan konvensional berbasis standar API 581 masih mengandalkan judgement subjektif tanpa dukungan framework yang konsisten. Oleh karena itu, penelitian ini mengintegrasikan metode Best-Worst Method (BWM) sebagai pendekatan framework untuk meningkatkan objektivitas dan akurasi penilaian risiko. Studi dilakukan pada sistem fuel gas yang terdiri dari empat peralatan utama. Sistem ini dipilih karena peran vitalnya dalam banyak proses serta terhubung langsung dengan peralatan strategis seperti Gas Turbine Compressor (GTC). Mekanisme kerusakan dominan yang teridentifikasi adalah thinning akibat korosi 〖CO〗_2 serta corrosion under insulation (CUI) akibat akumulasi kelembaban di balik insulasi. BWM digunakan untuk menghasilkan bobot terhadap enam kriteria Probability of Failure (PoF) dan dua kriteria Consequence of Failure (CoF). Hasilnya menunjukkan bahwa inspection factor dan damage factor merupakan faktor dominan dalam PoF. Sedangkan dalam aspek CoF, dampak finansial dinilai lebih dominan dibandingkan dengan penyebaran area kerusakan. Evaluasi PoF dilakukan menggunakan tiga pendekatan yaitu kualitatif, kuantitatif, dan semi-kuantitatif berbasis BWM. Hasil menunjukkan bahwa ketiga peralatan yaitu HP Scrubber dan HP Separator A dan B. memiliki skor PoF sebesar 2 pada pendekatan kualitatif dan kuantitatif, sedangkan LP Separator bernilai 2 untuk kualitatif dan 1 untuk kuantitatif. Selanjutnya, nilai PoF semi-kuantitatif sebesar 2,267 untuk HP Scrubber, 2,231 dan 2,245 untuk HP Separator A dan B, serta 2,152 untuk LP Scrubber. Dalam aspek CoF, pendekatan semi-kuantitatif menunjukkan skor konsekuensi finansial sebesar 2,7166 untuk peralatan tekanan tinggi dan 1,8583 untuk LP Scrubber. Evaluasi risiko menunjukkan bahwa seluruh peralatan berada dalam kategori low hingga low-medium. Jadwal inspeksi internal disusun menggunakan pendekatan load leveling pada tahun 2029 untuk meningkatkan efisiensi shutdown dan konsistensi anggaran. Selain itu, metode inspeksi untuk thinning dan CUI ditingkatkan ke level fairly effective guna memastikan deteksi kerusakan yang lebih optimal. Integrasi BWM dalam RBI terbukti meningkatkan kualitas pengambilan keputusan teknis serta mendukung perencanaan inspeksi berbasis risiko secara lebih adaptif dan proporsional terhadap kondisi aktual sistem.
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Asset integrity is a crucial aspect in the oil and gas industry to ensure safe and efficient operations. One effective method in risk management is Risk-Based Inspection (RBI), which prioritizes inspections on equipment with the highest risk levels. However, conventional approaches based on API 581 standards often rely on subjective judgment without a consistent supporting framework. Therefore, this study integrates the Best-Worst Method (BWM) as a decision-making framework to enhance the objectivity and accuracy of risk assessments. The study was conducted on a fuel gas system consisting of four main equipment units. This system was selected due to its vital role in supporting turbines and other processing operations, as well as its direct connection to strategic equipment such as the Gas Turbine Compressor (GTC). The dominant failure mechanisms identified include thinning due to CO₂ corrosion and corrosion under insulation (CUI) caused by moisture accumulation beneath the insulation layer. BWM was used to assign weights to six Probability of Failure (PoF) criteria and two Consequence of Failure (CoF) criteria. The results indicate that inspection factor and damage factor are the most influential in PoF assessment, while financial consequence is considered more dominant in the CoF aspect compared to affected area. PoF evaluation was performed using three approaches: qualitative, quantitative, and semi-quantitative based on BWM. The results show that the HP Scrubber and HP Separators A and B scored 2 in both qualitative and quantitative assessments, while the LP Scrubber scored 2 and 1 respectively. In the semi-quantitative approach, PoF values were 2.267 for HP Scrubber, 2.231 and 2.245 for HP Separators A and B, and 2.152 for LP Scrubber. For CoF, the semi-quantitative results show a financial consequence score of 2.7166 for high-pressure equipment and 1.8583 for the LP Fuel Gas Scrubber. Risk evaluation indicates that all equipment falls within the low to low-medium risk categories. Internal inspection schedules were developed using a load leveling approach in 2029 to improve shutdown efficiency and budget consistency. In addition, inspection methods for thinning and CUI were upgraded to the fairly effective level to ensure more optimal damage detection. The integration of BWM into RBI proves to improve the quality of technical decision-making and supports a more adaptive and proportional risk-based inspection planning aligned with the actual conditions of the system
