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"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."

"ABSTRAKKecepatan produk sampai ke pasaran menuntut kecepatan dalam pemilihan desain, dimana bentuk desain dipengaruhi oleh fitur, bentuk fitur berbeda bisa memiliki fungsi sama sehingga pilihan bentuk fitur akan ikut menentukan dalam proses permesinan dan biaya produksinyaPada penelitian ini dilakukan penetapan identitas melalui pengenalan informasi geometri dari bentuk-bentuk fitur yang diklasifikasikan oleh Jong-Yun Jung kemudian digambar dengan model solid disimpan bentuk stp atau step file selanjutnya diekstrak dengan notepad sehingga diperoleh entity Advance_Face dan Edge_Curve, yang diolah menjadi koefisien relatif produk.Indek kompleksitas fitur produk mekanik dihitung menggunakan model yang dikembangkan sebelumnya oleh El Maraghy dan diperoleh nilai kompleksitas tertinggi untuk fitur rotasional adalah bentuk Neck yaitu 6,30, fitur prismatik bentuk slot yaitu 6,05, fitur slab yaitu bentuk pocket sebesar 5,66 dan fitur revolving sebesar 4,94

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AbstractThe speed of products demands speed in the selection of design where design is influenced by the shape of the feature, having different form of a feature can have the same functions so insiders features form options determine the process of machinery and production costs.This research was conducted on identity determination through the introduction of information geometry forms features are classified by Jong-Yun Jung later drawn with CAD solid form, it saved on stp model or step file and then extracted with notepad so that retrieved entity Advance_Face and Edge_Curve, which are processed into relative complexity coefficients.Feature product complexity index was calculated using a model developed by El Maraghy and accrues the highest complexity value for rotational features is a form of neck of 6.30, prismatic features form slots which of 6.05, the form of pocket features slab of 5.66 and revolving features of 4.94."

"Systematic consideration of environmental aspects within the early stages of product development (PD) can be considered highly significant in order for the overall environmental performance of the product to be improved. Many methods and tools have been developed aiming to enable this consideration and provide the properties that need to be considered and improved. This article provides an overview of some well-known and more applicable tools and methods that have been developed and are available today. The identified tools are generally classified in two groups: Guidelines and Analytical tools. The limitations and barriers of current tools are assessed and categorized and two areas for work are proposed in order to address current limitations in the existing literature. One of the areas is followed and a scoring model is proposed as a new tool for sustainable PD."

"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."

"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."