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"Recent literature in automotive research indicates that studies of the environmental impact mostly concern metal-based components. Environmental effects are mainly analyzed using “environmental performance indicators” and “life cycle assessment” techniques. Therefore, a knowledge gap in the field of studying automotive plastic components should be conducted based on analyzing material and manufacturing processes selection at the design stage. The research is focused on a plastic component previously unexplored and analyzed using tools that have not been employed for this application. A computer-aided tool was used to model the part and its associated sustainability function was used to analyze its environmental impact. The component was analyzed using different materials and manufacturing processes, then redesigned to be more ergonomic. The improved component design was manufactured using rapid prototyping and a consumer preference survey was conducted to determine which component was preferred. The research found that by changing the material to high-density polyethylene there would be approximately a 30% reduction in carbon footprint, 24% reduction in air acidification, 26% reduction in water eutrophication and 15% reduction in total energy consumption. Injection molding is found to be the most sustainable manufacturing process."

"The transition within business from a linear to a circular economy brings with it a range of practical challenges for companies. The following question is addressed: What are the product design and business model strategies for companies that want to move to a circular economy model? This paper develops a framework of strategies to guide designers and business strategists in the move from a linear to a circular economy. Building on Stahel, the terminology of slowing, closing, and narrowing resource loops is introduced. A list of product design strategies, business model strategies, and examples for key decision-makers in businesses is introduced, to facilitate the move to a circular economy. This framework also opens up a future research agenda for the circular economy."

"Finding the novelty in and developing new science and engineering applications in the world is very important and interesting. Overall, process and product engineering aims to improve and increase the effectiveness of the engineering process in order to achieve the optimum conditions. However, engineering and environmental applications still contain various limitations such as high energy demand, catalyst costs, and less reuse or regeneration of adsorbents and catalysts. These challenges have led to the exploration of cheaper precursors, the regeneration of adsorbents or catalysts, mechanisms reactions, and overall optimization of the engineering process. Moreover, multifunctional and advanced materials could be promising as materials for further applications. To the best of our knowledge, investigation and exploration of the precursors, methods, design, instruments, product, and/or manufacturing is required for the future as they facilitate and integrate with each other. The adsorption process is a simple and important method for many applications within the environment and industries to deal with the removal of heavy metals, pollutants, and odor from wastewater, and to tackle polluted air. Clean energy sources and global warming have been major issues and challenges for many years, including a reduction of co2. Much attention has been paid to the key issue of developing alternative uses for by-products (waste) in addressing the sustainability of this resource. In particular, the utilization of any by-product (waste) as a useful product should be considered as a source of economic, eco-friendly, high-efficiency, and renewable materials, and should follow at least one rule, such as the “polluter pays” principle. This is expected to pave the way for the attainment of advanced applications. All of the findings of this research are effective and may be used to enable the further development of environmental applications for the removal of a diverse range of pollutants, diminish hazardous pollutants, and facilitate the minimization method for the management of waste. On the other hand, to improve the production of renewable energy and further applications, the overall process also needs to be considered, including the temperature, time, feedstock composition, catalyst, and arrangement of the design.to address the above problems, the 2nd international tropical renewable energy conference (i-trec) 2017 was held on october 3–4, 2017 at the courtyard by marriott bali nusa dua resort, bali, indonesia. The 2nd i-trec 2017 was proudly organized by the tropical renewable energy center, faculty of engineering, universitas indonesia. The main theme of the 2nd i-trec 2017 was “towards tropical renewable energy innovation and technology integration.” The 168 presented papers came from various countries, such as australia, brunei darussalam, brazil, france, indonesia, japan, and malaysia. The 2nd i-trec 2017 covered three symposia, namely renewable energy system and regulation, biomass and biotechnology, and multifunctional and advanced materials for renewable energy applications. From a total of 168 papers from the three symposia, we selected 22 for publication in ijtech. The papers are from a range of fields, as follows: architecture (1), chemical engineering (9), civil engineering (1), electrical engineering (1), mechanical engineering (7), and metallurgical and materials engineering (3). All of the 22 selected papers from the three symposia are summarized below."

"The precision of the 3-D model and the mesh quality of the remanufactured impeller are directly related to the accuracy of the results of numerical simulation analysis. In order to acquire high accuracy results, 3-D Modeling/hexahedral mesh technologies for remanufactured centrifugal compressor impellers are investigated. A method to reconstruct the structural characteristics of the remanufactured centrifugal compressor impellers, which was based on the measurement points of the structural characteristics and NURBS curve and surface theory, was proposed on the basis of the failure characteristics. Besides, the 3-D model construction process of the remanufactured centrifugal compressor impeller was introduced in detail. Furthermore, based on the 3-D model, a hexahedral meshing method was proposed. The quality of the remanufactured impeller mesh was analyzed with Jacobian matrix. The results showed that the 3-D model and the hexahedral mesh in this study met the accuracy requirement of the FEM analysis."

"Penelitian ini bertujuan untuk memberikan perencanaan peningkatan fleksibilitas produksi pada produk dengan unmatching ratio tertinggi pada sebuah perusahaan di Indonesia. Penelitian ini berfokus pada permasalahan ketidakmampuan menyerap fluktuasi order yang dilakukan oleh dealer atau end customer di salah satu perusahaan otomotif ternama di Indonesia. Jika hal itu tidak dapat diatasi, maka akan berpotensi terjadinya cancelation order. Untuk itu, diperlukan perbaikan untuk dapat meningkatkan fleksibilitas produksi perusahaan. Metode yang digunakan dalam penelitian ini adalah DMAIC (Define, Measure, Analyze, Improve & Control) untuk mendapatkan solusi yang tepat. Perbaikan yang dilakukan akan memberikan dampak terhadap opportunity cost dan unmatching ratio. Pada penelitian ini, dibuat skema penyerapan fluktuasi order secara mingguan berupa WOC (Weekly Order Change) dengan melakukan pengadaan safety stock terhadap unique part dengan melakukan perhitungan menggunakan Q-model. Hasil yang didapatkan dari penelitian ini adalah profit sebagai opportunity cost Rp431.635.851 serta penurunan unmatching ratio dari 4,9% pada keadaan sebelum menjadi 1,2% pada keadaan setelah perbaikan

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This study aims to increasing production flexibility on highest unmatching ratio products in a Indonesia company. This study focuses on the problem of an inability to absorb orders fluctuations by dealer or end customer at one of Indonesia's leading automotive companies. If it is not solved, it will potentially causes cancelation order. Therefore, the necessary improvements in order to increase the production flexibility of the company. Method used in this research is DMAIC (Define, Measure, Analyze, Improve & Control) in way to get the right solution. Improvements will have an impact on opportunity cost and unmatching ratio. In this study, absorption scheme fluctuations order on a weekly basis in the form of WOC (Weekly Change Order) with adding a safety stock of unique part by using Q-model calculations. The results obtained from this study is the profit as the opportunity cost IDR431,635,851 and unmatching ratio decrease from 4.9% in before condition become 1.2% in after condition.

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"Central gathering station 10 (CGS-10) menampung seluruh fluida dari beberapa sumur minyak. Incoming fluida di area CGS-10 saat ini sebesar 212.000 BOPD. Pada tahun 2030 akan dilakukan peningkatan produksi sebesar 312.000 BOPD. Beberapa skenario yang dilakukan menghasilkan kesimpulan performa heat exchanger sudah tidak normal karena temperature outlet maksimum fluida pada berbagai kondisi tidak mencapai 175°F. Setelah dilakukan penilaian kecukupan kapasitas pada fasilitas yang ada, perlu adanya penambahan heat exchanger. Pada praktik keinsinyuran ini, analisis mechanical design dilakukan berdasarkan datasheet proces dan penjadwalan proyek berdasarkan analisis material take off (MTO) pada pekerjaan konstruksi civil & piping, dibantu dengan software Microsoft Project yang mempermudah dalam pembuatan engineering, procurement & construction (EPC Schedule). Dari Praktik keinsinyuran ini didapatkan material Tubes SA 213 TP316L ; Tubesheet, Baffles/Tube Support & Floating Head Cover SA 240-316L ; Tie Rods & Spacers SS 316L ; Bolt & Nut SA-193-B7 & SA-194- 2H ; Shell & Shell Cover SA 516 Gr.70 ; Shell Flange SA 105 ; Channel/Bonnet, Channel Cover & Channel Flange SA 105 + SA 240-316L Clad. Jalur kritis pada aktivitas bidding process, project management & administration, engineering, procurement, heat exchanger installation, dan pre-commisioning & commissioning dengan total keseluruhan durasi proyek yaitu 543 Hari.

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Central gathering station 10 (CGS-10) accommodates all fluids from several oil wells. Incoming fluid in the CGS-10 area is currently 212,000 BOPD. In 2030, production will increase by 312,000 BOPD. Several scenarios carried out resulted in the conclusion that the heat exchanger performance was not normal because the maximum outlet temperature of the fluid under various conditions did not reach 175°F. After assessing the capacity adequacy of existing facilities, it is necessary to add a heat exchanger. In this engineering practice, mechanical design analysis is carried out based on process data sheets and project scheduling based on material take off (MTO) analysis in civil & piping construction work, assisted by Microsoft Project software which makes it easier to create engineering, procurement & construction (EPC Schedules). From this engineering practice, the material Tubes SA 213 TP316L was obtained; Tubesheet, Baffles/Tube Support & Floating Head Cover SA 240-316L ; Tie Rods & Spacers SS 316L ; Bolt & Nut SA-193-B7 & SA-194-2H ; Shell & Shell Cover SA 516 Gr.70 ; Shell Flange SA 105; Channel/Bonnet, Channel Cover & Channel Flange SA 105 + SA 240-316L Clad. The critical path includes bidding process, project management & administration, engineering, procurement, heat exchanger installation, and pre-commissioning & commissioning activities with a total project duration of 543 days."

"Salah satu aktivitas yang memegang peranan penting dalam menjamin kualitas packaging material yang akan dipakai pada proses produksi adalah aktivitas inspeksi. Dalam proses inspeksi selalu muncul situasi yang dinamis. Penelitian ini dilakukan untuk melakukan perancangan simulasi inspection plan aktivitas packaging material. Pemodelan simulasi dilakukan menggunakan software Plant Simulation. Model simulasi yang dibuat yaitu model simulasi dengan kondisi yang berjalan saat ini serta model dengan penentuan sampel menggunakan metode MIL STD 1916. Hasil penelitian ini adalah model dengan penentuan sampel yang berjalan saat ini, 1096 sampel bisa diselesaikan dengan 5 orang inspektor yang bekerja 1 shift. Sedangkan dengan penentuan sampel MIL STD 1916, 2120 sampel bisa diselesaikan dengan 6 orang inspektor yang bekerja 3 shift setiap hari.

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One of the main activity that has important impact to make sure packaging materials quality that would be used in production process is inspection activity. In the inspection process always appear dynamic situation. This study was conducted to simulate the design of packaging material inspection plan activity. Simulation modeling performed using the Plant Simulation software. The simulation model that created is a simulation model using current conditions and model with sample size using MIL STD 1916 method. Results of this study was to define model using the sample size current condition, 1096 samples could be completed by 5 inspectors who work one shift. While using the sample size MIL STD 1916 method, 2120 samples could be completed by 6 inspectors who work 3 shifts per day."