1,032 results
Search Results
2. Explanation for papers missing from this special issue
- Author
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Atilla Ansal, Özyeğin University, and Ansal, Mustafa Atilla
- Subjects
Engineering ,Geophysics ,business.industry ,Engineering ethics ,Building and Construction ,Geotechnical Engineering and Engineering Geology ,business ,Structural geology ,Civil and Structural Engineering - Abstract
N/A
- Published
- 2018
3. Feature engineering of EEG applied to mental disorders: a systematic mapping study.
- Author
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García-Ponsoda, Sandra, García-Carrasco, Jorge, Teruel, Miguel A., Maté, Alejandro, and Trujillo, Juan
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MENTAL illness ,MACHINE learning ,ELECTROENCEPHALOGRAPHY ,ARTIFICIAL intelligence ,ENGINEERING - Abstract
Around a third of the total population of Europe suffers from mental disorders. The use of electroencephalography (EEG) together with Machine Learning (ML) algorithms to diagnose mental disorders has recently been shown to be a prominent research area, as exposed by several reviews focused on the field. Nevertheless, previous to the application of ML algorithms, EEG data should be correctly preprocessed and prepared via Feature Engineering (FE). In fact, the choice of FE techniques can make the difference between an unusable ML model and a simple, effective model. In other words, it can be said that FE is crucial, especially when using complex, non-stationary data such as EEG. To this aim, in this paper we present a Systematic Mapping Study (SMS) focused on FE from EEG data used to identify mental disorders. Our SMS covers more than 900 papers, making it one of the most comprehensive to date, to the best of our knowledge. We gathered the mental disorder addressed, all the FE techniques used, and the Artificial Intelligence (AI) algorithm applied for classification from each paper. Our main contributions are: (i) we offer a starting point for new researchers on these topics, (ii) we extract the most used FE techniques to classify mental disorders, (iii) we show several graphical distributions of all used techniques, and (iv) we provide critical conclusions for detecting mental disorders. To provide a better overview of existing techniques, the FE process is divided into three parts: (i) signal transformation, (ii) feature extraction, and (iii) feature selection. Moreover, we classify and analyze the distribution of existing papers according to the mental disorder they treat, the FE processes used, and the ML techniques applied. As a result, we provide a valuable reference for the scientific community to identify which techniques have been proven and tested and where the gaps are located in the current state of the art. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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4. A systematic literature review on quality criteria for agile requirements specifications.
- Author
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Heck, Petra and Zaidman, Andy
- Subjects
LITERATURE reviews ,ENGINEERING ,STANDARDS ,AGILE software development ,REQUIREMENTS engineering - Abstract
The quality of requirements is typically considered as an important factor for the quality of the end product. For traditional up-front requirements specifications, a number of standards have been defined on what constitutes good quality : Requirements should be complete, unambiguous, specific, time-bounded, consistent, etc. For agile requirements specifications, no new standards have been defined yet, and it is not clear yet whether traditional quality criteria still apply. To investigate what quality criteria for assessing the correctness of written agile requirements exist, we have conducted a systematic literature review. The review resulted in a list of 16 selected papers on this topic. These selected papers describe 28 different quality criteria for agile requirements specifications. We categorize and analyze these criteria and compare them with those from traditional requirements engineering. We discuss findings from the 16 papers in the form of recommendations for practitioners on quality assessment of agile requirements. At the same time, we indicate the open points in the form of a research agenda for researchers working on this topic. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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5. Miura-ori enabled stretchable circuit boards.
- Author
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Li, Yongkai, Liu, Weixuan, Deng, Yang, Hong, Wei, and Yu, Hongyu
- Subjects
INTEGRATED circuits ,ORIGAMI ,FABRICATION (Manufacturing) ,PAPER arts ,ENGINEERING - Abstract
Origami, an ancient form of papercraft, provides a way to develop functional structures for engineering applications. In this paper, we report an approach to design and manufacture a stretchable circuit board (SCB) with origami structures. The benefits of developable, flat-foldable, and rigid-foldable origami-based structures as SCBs are discussed, and a representative structure, Miura fold (or Miura-ori), is chosen to be investigated. Under the constraints induced by the mounted components' dimensions, the Miura-ori structures for specific applications can be defined. We propose three methods for better fabrication, including direct folding, stiffness modification, and kirigami enhancement, to improve a planar sheet's foldability. A wearable ECG (electrocardiogram) system based on MO-SCB (Miura-ori enabled SCB) technology is built, and the stretchable portion is made of commercial FPCBs (flexible printed circuit board), providing desired stretchability and reliability. The proposed technology routine is compatible with industrial production and may pave the application of stretchable electronics. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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6. Competing, complementary and co-existing paradigms in techno-scientific literature: A case study of Nanotechnology for engineering.
- Author
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Prabhakaran, Thara, Lathabai, Hiran H., and George, Susan
- Abstract
Nanotechnology is a research field that has potential to drive the progress of mankind for the next few decades. Its application is found in every discipline, ranging from material science to space communication. Owing to its potential for ubiquity, and capability of replacing many general purpose technologies, co-existence of several paradigms are expected in nanotechnology. Flow Vergence (FV) gradient has been recently introduced as a metric to mine the network of scientific literature for detecting the paradigm shifts. In this paper, we have performed citation network analysis of scientific publications in nanotechnology from research area 'engineering' for identification of paradigms related to the same. Flow vergence gradient revealed 18 subnetworks that deal with 25 likely pivots of paradigm shifts. Major paradigm shifts can be found in the field of targeted drug delivery. Nanonetworks, a crossover of IT, BT and nanotechnology is the another interesting paradigm shift identified. An extended subnetwork analysis has been conducted to identify the competing or complementary nature of the emerging paradigms in the subnetworks. A framework for this has also been introduced. This analysis revealed that most of the paradigms in the targeted delivery are competing paradigms. Complementary paradigms are also identified in nano electronics and targeted drug delivery. Policy implications from this identification for various target groups are also discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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7. Pilot study on the digitalization of the national qualification exam for Korean engineers.
- Author
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Bang, Mi-Hyun and Lee, Young-Min
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DIGITAL technology ,ENGINEERS ,DATABASES ,COLLEGE teachers ,ENGINEERING - Abstract
The Human Resources Development Service of Korea developed a digital exam for five representative engineering categories and conducted a pilot study comparing the findings with the paper-and-pencil exam results from the last three years. This study aimed to compare the test efficiency between digital and paper-and-pencil examinations. A digital examination was conducted with 93 participants through two rounds of test-status measurements. We collected the following data: early check-out rate, pass rate, and the average total response time per grade. The composition ratio of each question type in the digital exam was determined per the "Exam Operation Regulation" and selected from a databank spanning five years by experienced instructors. The early check-out rate of the digital exam at the Engineer level was 90% (percentage points), approximately 15%p higher than that for the paper-and-pencil exam, but the pass rate was low (9.8%p); the response time per question for the digital exam was approximately 0.2 min shorter. The results for both exams were similar in the Industrial Engineer category. The early check-out rate did not positively affect the exam pass rate, but the time taken depended on the number and characteristics of the subjects. It is necessary to improve the simplification and convenience of digital examinations, optimize test environments, and establish operation and management systems in line with the change in the Korean Technical Qualification Framework. We also suggest a gradual shift to digital examination by developing questions and tools using technologies to accurately measure individual abilities. [ABSTRACT FROM AUTHOR]
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- 2024
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8. Rigorous engineering of collective adaptive systems – 2nd special section.
- Author
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Wirsing, Martin, Jähnichen, Stefan, and De Nicola, Rocco
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BIOLOGICALLY inspired computing ,ENGINEERING ,MACHINE learning ,SOFTWARE engineering - Abstract
An adaptive system is able to adapt at runtime to dynamically changing environments and to new requirements. Adaptive systems can be single adaptive entities or collective ones that consist of several collaborating entities. Rigorous engineering requires appropriate methods and tools that help guaranteeing that an adaptive system lives up to its intended purpose. This paper introduces the special section on "Rigorous Engineering of Collective Adaptive Systems." It presents the 11 contributions of the section categorizing them into five distinct research lines: correctness by design and synthesis, computing with bio-inspired communication, new system models, machine learning, and programming and analyzing ensembles. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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9. GUEST EDITORIAL Special Issue on Recent Trends in Advanced Computing, Engineering and Technology: Transformation and Innovation.
- Author
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Tchernykh, Andrei, Ramírez, Reyes Juárez, Guarda, Teresa, and Portela, Filipe
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MOBILE learning ,ENGINEERING ,SCIENTIFIC method ,TECHNOLOGICAL innovations ,PROJECT management software ,DATABASE design - Abstract
His main interests include resource optimization technique, adaptive resource provisioning, multi-objective optimization, computational intelligence, incomplete information processing, cloud computing, and security. The evaluation showed that these apps had an acceptable score on the System Usability Scale (SUS). The paper "Influence of Belbin's Role Theory on Database Design: Experimenting with Software Engineering Students" explores the benefits of using Belbin's role theory of team and individual related tasks in the software development process, particularly for Database Design (DB) Design. The authors argued that the usability evaluation described in this work can serve as a reference for developers seeking to improve learning monitoring and personalization services in software applications. [Extracted from the article]
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- 2022
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10. The optimization and engineering at the service of the sustainable development of energy, water and environment systems.
- Author
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Trafczynski, Marian, Urbaniec, Krzysztof, Alabrudzinski, Slawomir, Mikulčić, Hrvoje, and Duić, Neven
- Abstract
This editorial article discusses recent findings in the optimization and engineering for sustainable development. The current Special Issue (SI) of the Optimization and Engineering journal stems from the 2022 Sustainable Development of Energy, Water and Environment Systems Conferences. These events included the 5th South East European, 3rd Latin American, and 17th SDEWES Conferences. Being selected from conference presentations, the papers in SI represent the main topics in optimization approaches that integrate various life-supporting systems discussed during these three events. After careful selection, the current SI accepted ten excellent papers summarized here. These contributions use differentiated modeling approaches and supporting tools, such as P-graph and network-flow modeling, computational fluid dynamics, pinch analysis (PA), and the Geographic Information System. The range of optimization methods includes mixed-integer linear and mixed-integer nonlinear programming (MILP and MINLP), dynamic programming, stochastic optimization, and PA and P-graph extensions. [ABSTRACT FROM AUTHOR]
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- 2024
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11. Conversing with AI chatbots: examining what OpenAI ChatGPT-4, Microsoft Bing Chatbot, and google bard know, think they know, do not know, and would like to know about engineering.
- Author
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Naser, M. Z., AlOgla, Saleh, Anand, N., Zhou, Huanting, and Zhang, Gang
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GEMINI (Chatbot) ,CHATGPT ,ARTIFICIAL intelligence ,PROFESSIONAL associations ,ENGINEERING ,CHATBOTS - Abstract
Copyright of Umm Al-Qura University Journal of Engineering & Architecture (Springer Nature) is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2024
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12. Experimental Aesthetics and Conceptual Engineering.
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Torregrossa, Clotilde
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EXPERIMENTAL philosophy ,ANALYTIC philosophy ,CONSTRUCTION projects ,ENGINEERS ,ENGINEERING ,AESTHETICS - Abstract
Experimental Philosophy (X-Phi) is now a fully-fledged methodological project with applications in almost all areas of analytic philosophy, including, as of recently, aesthetics. Another methodological project which has been attracting attention in the last few years is conceptual engineering (CE). Its areas of implementation are now diverse, but as was the case initially with experimental philosophy, aesthetics has unfortunately been left out (or perhaps aestheticians have failed to pay attention to CE) until now. In this paper, I argue that if conceptual engineers are interested in expanding their project to the field of aesthetics, which would greatly benefit the field, then they should rely on the existing experimental work of aestheticians. Experimental philosophers have only recently started to join forces with conceptual engineers in various fields, as well as to explore the methodological implications of such an alliance. This paper goes a step further by not only arguing that CE has potential in aesthetics, but that the way to realize this potential is to piggyback, so to speak, on the work of experimental aestheticians. In other words, instead of building a CE project in aesthetics from the ground up, this paper describes the support that CE can and should derive from current experimental aesthetics, thereby making the former's development more efficiently realizable. Furthermore, I argue that doing so would also be beneficial to experimental aesthetics. Currently, the integration of X-Phi to the wider field of aesthetics is losing ground because certain objections—notably, the objection that X-Phi cannot be of relevance to normative questions—have not been properly refuted. By pairing up with a normative programme like CE, though, experimental aestheticians should finally be able to put these objections to rest. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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13. Prompting Change: Exploring Prompt Engineering in Large Language Model AI and Its Potential to Transform Education.
- Author
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Cain, William
- Subjects
LANGUAGE models ,ARTIFICIAL intelligence ,ITERATIVE learning control ,ENGINEERING ,ARTIFICIAL languages ,ACTIVE learning - Abstract
This paper explores the transformative potential of Large Language Models Artificial Intelligence (LLM AI) in educational contexts, particularly focusing on the innovative practice of prompt engineering. Prompt engineering, characterized by three essential components of content knowledge, critical thinking, and iterative design, emerges as a key mechanism to access the transformative capabilities of LLM AI in the learning process. This paper charts the evolving trajectory of LLM AI as a tool poised to reshape educational practices and assumptions. In particular, this paper breaks down the potential of prompt engineering practices to enhance learning by fostering personalized, engaging, and equitable educational experiences. The paper underscores how the natural language capabilities of LLM AI tools can help students and educators transition from passive recipients to active co-creators of their learning experiences. Critical thinking skills, particularly information literacy, media literacy, and digital citizenship, are identified as crucial for using LLM AI tools effectively and responsibly. Looking forward, the paper advocates for continued research to validate the benefits of prompt engineering practices across diverse learning contexts while simultaneously promoting potential defects, biases, and ethical concerns related to LLM AI use in education. It calls upon practitioners to explore and train educational stakeholders in best practices around prompt engineering for LLM AI, fostering progress towards a more engaging and equitable educational future. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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14. Design of blockchain-based applications using model-driven engineering and low-code/no-code platforms: a structured literature review.
- Author
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Curty, Simon, Härer, Felix, and Fill, Hans-Georg
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LITERATURE reviews ,ENGINEERING ,APPLICATION software ,MODEL-driven software architecture ,INDUSTRIAL engineering ,SOFTWARE architecture ,BLOCKCHAINS - Abstract
The creation of blockchain-based software applications requires today considerable technical knowledge, particularly in software design and programming. This is regarded as a major barrier in adopting this technology in business and making it accessible to a wider audience. As a solution, low-code and no-code approaches have been proposed that require only little or no programming knowledge for creating full-fledged software applications. In this paper we extend a review of academic approaches from the discipline of model-driven engineering as well as industrial low-code and no-code development platforms for blockchains. This includes a content-based, computational analysis of relevant academic papers and the derivation of major topics. In addition, the topics were manually evaluated and refined. Based on these analyses we discuss the spectrum of approaches in this field and derive opportunities for further research. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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15. Designing scheme of compositionally tuned high-strength and high-conductive copper alloy: a systematic phase transformation study.
- Author
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Shukla, Nidhi, Sinha, Shyam Kanta, Munir, Bushra, Srishilan, C., Srivastava, Chandan, and Sarkar, Suman
- Subjects
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ELECTRIC conductivity , *ELECTRON microscopy , *ALLOYS , *MICROSTRUCTURE , *ENGINEERING - Abstract
Copper alloys are at the forefront of alloy innovation, as they possess outstanding strength and unparalleled electrical conductivity. This papers sequentially reviews current strategic approaches that have successfully balanced the attainment of both strength and conductivity in copper alloys in the Cu–Fe–Si system. These approaches involve fine-tuning the composition and utilizing hierarchical multi-scale microstructural templates. This work provides a comprehensive assessment of the important developmental stages of high-strength conductive copper alloys in the Cu–Fe–Si system. This study emphasizes the relationship between composition, microstructure, and mechanical and electrical properties by implementing a cost-effective rapid casting method with alloying procedures and conducting extensive electron microscopy for microstructural characterization. The full research yields valuable insights that may be used to optimize copper alloys for a wide range of applications that demand both strength and conductivity. Furthermore, the present study additionally enhances our understanding of the phase transformation events in the alloy system by including novel microstructural observations. The current paper also presents novel findings about sustainable performance and real-time engineering applications, specifically in connection to creep qualities and their link with microstructure. This paper explores the complex relationship between the composition of alloys and the process of refining their structure. The knowledge acquired provides a foundation for creating customized alloys that are well-positioned to suit the changing requirements of various industries, including aerospace and electronics. [ABSTRACT FROM AUTHOR]
- Published
- 2025
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16. A scoping review on U.S. undergraduate students with disabilities in STEM courses and STEM majors.
- Author
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Borrego, Maura, Chasen, Ariel, Chapman Tripp, Hannah, Landgren, Emily, and Koolman, Elisa
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STUDENTS with disabilities ,PEOPLE with disabilities ,UNIVERSAL design ,EDUCATION research ,ENGINEERING mathematics - Abstract
Background: The purpose of this scoping review is to describe how the literature has discussed and studied disability in undergraduate-level STEM courses in the United States. A Critical Disability Studies lens informed our inclusion criteria. Results: We considered extensive lists of disability types and diagnoses and concluded that "disability" as a search term best captured educational experiences rather than medical approaches. After screening nearly 9000 abstracts, we identified a final set of 409 dissertations, articles, conference papers, commentaries, briefs and news items. Sources appeared in discipline-based education research (DBER), STEM disciplinary and education journals as well as DBER conferences. Under 10% of sources included 2-year college settings. The largest groups of sources focused on disability writ large (39%, vs. specific categories) and across STEM (38%, vs. specific disciplines). Students were the main research participants (80%). Instructors were the main target of recommendations (84%). In terms of solutions, the largest group (n = 111) advocated for Universal Design, followed by accommodations (n = 94), and technology developed or tested with persons with disabilities (n = 90). Sources which the authors framed as empirical studies less frequently disclosed positionality as a person with a disability (16%) than non-empirical sources (21%). Quantitative (n = 125), qualitative (n = 99), and mixed methods (n = 64) approaches were well-represented. The most common data collection methods were surveys, assessments or task completions (n = 161 sources), followed by interviews (n = 109), observations (n = 44), document analyses (n = 18), and institutional student records (n = 14). Conclusions: More research is needed that centers the experiences of students with disabilities, focuses on specific disability types, employs critical quantitative and qualitative methodologies, and otherwise avoids implicit deficit views of disabled students. Citations to the qualifying sources are available in a public Zotero library. [ABSTRACT FROM AUTHOR]
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- 2025
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17. An injection molding method for optical lenses with high-quality consistency by regulating the closing behavior of non-return valve.
- Author
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Ma, Yitao, Li, Jing, Jiao, Xiaolong, Jin, Biao, Ye, Liyong, Yang, Weimin, and Xie, Pengcheng
- Subjects
- *
CHECK valves , *STATISTICAL reliability , *SCREWS , *ENGINEERING , *SPEED - Abstract
Injection molding is one of the most important polymer processing methods, and the traditional injection molding process cannot meet the high repeatability requirements necessary for the production of optical lenses. The impact of melt flow behavior and non-return valve closing behavior on injection molding repeatability is studied in this paper. A strategy of adjusting the closure behavior of the non-return valve is proposed, which can improve the repeatability of injection molding without the need for specific modifications to the injection molding machine. In this paper, variables such as the reversal action, reversal speed, forward movement action, and forward speed of the screw were investigated. It was found that the reversal action and forward movement action had the most significant impact on the closure stability of the NRV. Through the implementation of this process, injection molding repeatability can reach 0.019%. Highlights: The closing behavior of the NRV during the injection molding is investigated. A method for regulating the closing behavior of NRV is proposed. Injection molding repeatability can reach 0.019% under the regulating method. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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18. Memristors based on two-dimensional h-BN materials: synthesis, mechanism, optimization and application.
- Author
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Zhang, Shaojie, Tao, Ye, Qin, Shiwei, Li, Dong, Cao, Kunkun, Lv, Lin, Ma, Guokun, Rao, Yiheng, Wan, Houzhao, and Hao, Wang
- Subjects
MEMRISTORS ,THERMAL conductivity ,LOGIC devices ,ENGINEERING - Abstract
Memristors offer vast application opportunities in storage, logic devices, and computation due to their nonvolatility, low power consumption, and fast operational speeds. Two-dimensional materials, characterized by their novel mechanisms, ultra-thin channels, high mechanical flexibility, and superior electrical properties, demonstrate immense potential in the domain of high-density, fast, and energy-efficient memristors. Hexagonal boron nitride (h-BN), as a new two-dimensional material, has the characteristics of high thermal conductivity, flexibility, and low power consumption, and has a significant application prospect in the field of memristor. In this paper, the recent research progress of the h-BN memristor is reviewed from the aspects of device fabrication, resistance mechanism, and application prospect. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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19. Soviet Metallurgy in the Eyes of American Metallurgists: Second Half of the 1950s. Metallurgical Education—Comparative Analysis.
- Author
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Zaparii, V. V., Zaparii, Vas. V., and Sheshukov, O. Yu.
- Abstract
The paper reveals a small chapter of the history of the development of metallurgical science and technology in the Soviet Union. The point at issue is the development of scientific contacts between the American and Soviet metallurgical scientists in the second half of the 1950s. The successes of the USSR in the space race had demonstrated to the Western countries the real scientific and economic power of the country and thus shown both the unconstructiveness of the policy of isolation and the benefits of economic cooperation. The high level of development of metallurgical science and technology in the USSR had thus surprised the American specialists. The Ural Polytechnic Institute was one of those universities visited by the American guests. This paper is devoted to this chapter of history and continues the material published earlier. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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20. Engineering complexity beyond the surface: discerning the viewpoints, the drivers, and the challenges.
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Garza Morales, Gisela A., Nizamis, Kostas, and Bonnema, G. Maarten
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EVIDENCE gaps ,SYSTEMS engineering ,LITERATURE reviews ,ENGINEERING ,ENGINEERING design - Abstract
Complexity is often regarded as a "problem" to solve. Instead of attempting to solve complexity, we follow systems engineering practices and switch back to the problem domain, where a major obstacle is the impossibility to universally define complexity. As a workaround, we explored complexity characterization and its existing shortcomings, including: lack of standardization, inconsistent semantics, system-centricity, insufficiently transparent reasoning, and lack of validation. To address these shortcomings, we proposed a compilatory framework to characterize complexity using the Five Ws information-gathering method. The answer to the WHO question proposed four complexity viewpoints; the answer to the WHY question proposed a two-dimensional structure for complexity drivers; and the answer to the WHAT question derived generalized complexity challenges. As a preliminary step to show the potential of the framework to characterize complexity, we used and validated it as a tool to structure general literature related to complexity. In general, our findings suggest that papers with complexity solutions do not frame their research within the complexity problem domain, hindering the contribution evaluation. Through the viewpoints, we identified general research gaps of six solution directions. From the drivers, we noted three observations in the discourse of complexity origins: (1) a system-driven tendency, (2) a preference for concreteness vs. abstraction, and (3) an unclear distinction between origins and effects. Through the challenges' findings we explored two hypotheses: (1) a system-centric preference; and (2) a solution-oriented vision, both of which were supported by the results (most challenges relate to the system viewpoint and challenges are defined based on solution directions). [ABSTRACT FROM AUTHOR]
- Published
- 2023
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21. Investigating large language models capabilities for automatic code repair in Python.
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Omari, Safwan, Basnet, Kshitiz, and Wardat, Mohammad
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LANGUAGE models ,CHATGPT ,ALGORITHMS ,ENGINEERING ,DOCUMENTATION - Abstract
Developers often encounter challenges with their introductory programming tasks as part of the development process. Unfortunately, rectifying these mistakes manually can be time-consuming and demanding. Automated program repair (APR) techniques offer a potential solution by synthesizing fixes for such errors. Previous research has investigated the utilization of both symbolic and neural techniques within the APR domain. However, these approaches typically demand significant engineering efforts or extensive datasets and training. In this paper, we explore the potential of using a large language model trained on code, specifically, we assess ChatGPT's capability to detect and repair bugs in simple Python programs. The experimental evaluation encompasses two benchmarks: QuixBugs and Textbook. Each benchmark consists of simple Python functions that implement well-known algorithms and each function contains a single bug. To gauge repair performance in various settings, several benchmark variations were introduced including addition of plain English documentation and code obfuscation. Based on thorough experiments, we found that ChatGPT was able to correctly detect and fix about 50% of the methods, when code is documented. Repair performance drops to 25% when code is obfuscated, and 15% when documentation is removed and code is obfuscated. Furthermore, when compared to existing APR systems, ChatGPT considerably outperformed them. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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22. Progress in the utilization of water hyacinth as effective biomass material.
- Author
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Nandiyanto, Asep Bayu Dani, Ragadhita, Risti, Hofifah, Siti Nur, Al Husaeni, Dwi Fitria, Al Husaeni, Dwi Novia, Fiandini, Meli, Luckiardi, Senny, Soegoto, Eddy Soeryanto, Darmawan, Arif, and Aziz, Muhammad
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WATER use ,BIOMASS energy ,AQUATIC plants ,PLANT products ,PLANT engineering ,WATER hyacinth - Abstract
Water hyacinth (Eichhornia crassipes) is considered a prospective free-floating aquatic plant potentially used to address current issues on food, energy, and the environment. It can grow quickly and easily in various tropical and subtropical environments as long as it has access to adequate light and water to support photosynthetic growth. Ecosystems are threatened by their invasive growth and remarkable capacity for adaptation. However, managing this plant can result in valuable products. This paper demonstrates particle technologies that might be used to utilize water hyacinths, including brake pads, fertilizer, bioenergy, animal feed, phytoremediation agents, bioplastics, and adsorbents. This study is accompanied by a discussion based on the conducted experiments and currently available literature, providing readers with a clearer understanding. Water hyacinth's capacity to absorb macro- and micro-nutrients, nitrogen, and phosphorus makes it a good plant for phytoremediation. The prospect of producing cellulose makes it prospective as a biomass energy source and livestock feeding. Further, it can be transformed into high-cellulose content particles for applications in bioplastics, brake pads, and adsorbents. The current reports regarding education of water hyacinth to student also were added. Finally, issues and suggestions for future development related to the use of water hyacinths are discussed. This study is expected to provide comprehensive knowledge on how to turn invasive water hyacinth plants into valuable products. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
23. TRAA: a two-risk archive algorithm for expensive many-objective optimization.
- Author
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Lin, Ji and Liu, Quanliang
- Subjects
BENCHMARK problems (Computer science) ,ALGORITHMS ,KRIGING ,ARCHIVES ,ENGINEERING - Abstract
Many engineering problems are essentially expensive multi-/many-objective optimization problems, and surrogate-assisted evolutionary algorithms have gained widespread attention in dealing with them. As the objective dimension increases, the error of predicting solutions based on surrogate models accumulates. Existing algorithms do not have strong selection pressure in the candidate solution obtaining and adaptive sampling stages. These make the effectiveness and area of application of the algorithms unsatisfactory. Therefore, this paper proposes a two-risk archive algorithm, which contains a strategy for mining high-risk and low-risk archives and a four-state adaptive sampling criterion. In the candidate solution mining stage, two types of Kriging models are trained, then conservative optimization models and non-conservative optimization models are constructed for model searching, followed by archive selection to obtain more reliable two-risk archives. In the adaptive sampling stage, in order to improve the performance of the algorithms, the proposed criterion considers environmental assessment, demand assessment, and sampling, where the sampling approach involves the improvement of the comprehensive performance in reliable environments, convergence and diversity in controversial environments, and surrogate model uncertainty. Experimental results on numerous benchmark problems show that the proposed algorithm is far superior to seven state-of-the-art algorithms in terms of comprehensive performance. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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24. ACGND: towards lower complexity and fast solution for dynamic tensor inversion.
- Author
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Ye, Aiping, Xiao, Xiuchun, Xiao, Hua, Jiang, Chengze, and Lin, Cong
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MATRIX inversion ,ARTIFICIAL intelligence ,COMPUTATIONAL complexity ,ENGINEERING ,MOTIVATION (Psychology) - Abstract
Dynamic Tensor Inversion (DTI) is an emerging issue in recent research, prevalent in artificial intelligence development frameworks such as TensorFlow and PyTorch. Traditional numerical methods suffer significant lagging error when addressing this issue. To address this, Zeroing-type Neural Dynamics (ZND) and Gradient-type Neural Dynamics (GND) are employed to tackle the DTI. However, these two methods exhibit inherent limitations in the resolution process, i.e. high computational complexity and low solution accuracy, respectively. Motivated by this technology gap, this paper proposes an Adaptive Coefficient Gradient Neural Dynamics (ACGND) for dynamically solving the DTI with an efficient and precise manner. Through a series of simulation experiments and validations in engineering applications, the ACGND demonstrates advantages in resolving DTI. The ACGND enhances computational efficiency by circumventing matrix inversion, thereby reducing computational complexity. Moreover, its incorporation of adaptive coefficients and activation functions enables real-time adjustments of the computational solution, facilitating rapid convergence to theoretical solutions and adaptation to non-statinary scenarios. Code is available at https://github.com/Maia2333/ACGND-Code-Implementation. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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25. Multiscale dilated convolution and swin-transformer for small sample gearbox fault diagnosis.
- Author
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Zhang, Yazhou, Zhao, Xiaoqiang, Liang, Haopeng, and Chen, Peng
- Subjects
PROBLEM solving ,NOISE ,SAMPLING methods ,ENGINEERING ,GEARBOXES - Abstract
Mechanical equipment usually operates in noisy and variable load environments, which presents serious challenges for existing intelligent diagnostic models. In addition, there are few labelled fault samples in real engineering scenarios, which makes it difficult to perform accurate fault identification for mechanical equipment. Thus, to solve the problem of diagnostic model performance degradation under small sample, noisy and variable load environments, this paper proposes a Multiscale Dilated Convolution and Swin-Transformer (MSDC-Swin-T) method for small sample gearbox fault diagnosis. First, we design the Coordinate Reconstruction Attention Mechanism (CRAM), which enhances the capture of impulse information by coordinate reconstruction. In addition, a multiscale convolutional token embedding module is constructed to extract local features at different scales, and its ability for capturing important features is adaptively enhanced by CRAM. Then, Swin-Transformer is utilized for modeling global dependencies, thus mining more subtle fault features. Finally, the effectiveness and stability of the MSDC-Swin-T is proved on two gearbox datasets. The experiments show that MSDC-Swin-T has superior diagnostic performance under small sample with noise and variable load environments. The diagnostic accuracy is better than the state-of-the-art methods. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
26. Complete Set of Bounds for the Technical Moduli in 3D Anisotropic Elasticity.
- Author
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Vannucci, Paolo
- Subjects
LINEAR algebra ,PROBLEM solving ,ELASTICITY ,ENGINEERING - Abstract
The paper addresses the problem of finding the necessary and sufficient conditions to be satisfied by the engineering moduli of an anisotropic material for the elastic energy to be positive for each state of strain or stress. The problem is solved first in the most general case of a triclinic material and then each possible case of elastic syngony is treated as a special case. The method of analysis is based upon a rather forgotten theorem of linear algebra and, in the most general case, the calculations, too much involved, are carried out using a formal computation code. New, specific bounds, concerning some of the technical constants, are also found. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
27. Guest editorial to the theme section on AI-enhanced model-driven engineering.
- Author
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Burgueño, Lola, Cabot, Jordi, Wimmer, Manuel, and Zschaler, Steffen
- Subjects
SYSTEMS engineering ,ENGINEERING systems ,ARTIFICIAL intelligence ,SOFTWARE engineers ,ENGINEERING ,SOFTWARE engineering - Abstract
This theme section brings together the latest research at the intersection of artificial intelligence (AI) and model-driven engineering (MDE). Over the past years, we have witnessed a substantial rise of AI successfully applied to different domains, including software development and MDE. Dedicated events at the intersection of AI and MDE have been created, too, such as the MDE Intelligence workshop series co-located with the MODELS conference. This theme section covers research contributions integrating AI components into MDE approaches—increasing the current benefits of MDE processes and tools and pushing the limits of "classic" MDE with the goal to provide software and systems engineers with the right techniques to develop the next generation of highly complex model-based systems—and applications of MDE to the development of AI components. In total, nine submissions were accepted in the theme section after a thorough peer-reviewing process. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
28. In vitro antioxidant capacity of Opuntia spp. fruits measured by the LOX-FL method and its high sensitivity towards betalains
- Author
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Mario Soccio, Andrea Gómez-Maqueo, M. Pilar Cano, Consejo Superior de Investigaciones Científicas (España), CSIC - Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Consejo Nacional de Ciencia y Tecnología (México), and Conferencia de Rectores de las Universidades Españolas
- Subjects
Opuntia ficus-indica ,Antioxidant ,medicine.medical_treatment ,Lipoxygenase ,Betalains ,engineering.material ,Antioxidants ,chemistry.chemical_compound ,Betalain ,medicine ,Food science ,Opuntia stricta var. Dillenii ,Betanin ,Original Paper ,Plant Extracts ,Pulp (paper) ,Plant physiology ,Opuntia ,food and beverages ,Ascorbic acid ,In vitro ,Phenolic compounds ,Antioxidant capacity ,chemistry ,Chemistry (miscellaneous) ,Fruit ,engineering ,Indicaxanthin ,LOX-FL assay ,Food Science - Abstract
Current in vitro methodologies neglect or subestimate the contribution of betalains to antioxidant capacity in foods because they do not reflect their in vivo biological mechanisms. In this study, we assessed the sensibility of the lipoxygenase-fluorescein (LOX-FL) method towards betalains, phenolic compounds and ascorbic acid from Opuntia spp. fruits; and (ii) the antioxidant capacity of peel and pulp extracts from Opuntia ficus-indica L. Mill (var. Fresa, Colorada and Blanco) and Opuntia stricta var. Dillenii; by comparing the LOX-FL method to traditional antioxidant methods (ORAC and TEAC). The spectrophotometric monitoring of the LOX-FL reaction avoided interference caused by betalain pigments. Indicaxanthin and betanin showed high antiperoxidative and radical scavenging mechanisms in the LOX-FL assay. O. stricta var. Dillenii tissues the highest antioxidant capacity which correlated with betanin content. ORAC and TEAC antioxidant methods were less sensible towards betalain antioxidant activity. To our knowledge, this is the first time the LOX-FL antioxidant method has been used on betalains and betalain-rich foods., Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature., We thank the funding from Spanish Ministry of Science and Innovation (Spain), projects INIA RTA2015-00044-C02-02 and PID2020-118300RB-C21. We thank Gloria Lobo (ICIA) for the recollection and provision of prickly pear fruits (RTA2015-00044-C02-01). Andrea Gómez-Maqueo thanks CONACyT (Mexico) for her doctoral scholarship 692751.
- Published
- 2021
29. Quality in model-driven engineering: a tertiary study.
- Author
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Goulão, Miguel, Amaral, Vasco, and Mernik, Marjan
- Subjects
ENGINEERING ,COMPUTER software quality control ,LEARNING ,TECHNOLOGY ,LITERATURE - Abstract
Model-driven engineering (MDE) is believed to have a significant impact in software quality. However, researchers and practitioners may have a hard time locating consolidated evidence on this impact, as the available information is scattered in several different publications. Our goal is to aggregate consolidated findings on quality in MDE, facilitating the work of researchers and practitioners in learning about the coverage and main findings of existing work as well as identifying relatively unexplored niches of research that need further attention. We performed a tertiary study on quality in MDE, in order to gain a better understanding of its most prominent findings and existing challenges, as reported in the literature. We identified 22 systematic literature reviews and mapping studies and the most relevant quality attributes addressed by each of those studies, in the context of MDE. Maintainability is clearly the most often studied and reported quality attribute impacted by MDE. Eighty out of 83 research questions in the selected secondary studies have a structure that is more often associated with mapping existing research than with answering more concrete research questions (e.g., comparing two alternative MDE approaches with respect to their impact on a specific quality attribute). We briefly outline the main contributions of each of the selected literature reviews. In the collected studies, we observed a broad coverage of software product quality, although frequently accompanied by notes on how much more empirical research is needed to further validate existing claims. Relatively, little attention seems to be devoted to the impact of MDE on the quality in use of products developed using MDE. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
30. Just worlding design principles: childrens' multispecies and radical care priorities in science and engineering education.
- Author
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Sanchez, Anastasia
- Subjects
ENGINEERING education ,SCIENCE education ,ONTOLOGICAL security ,ENGINEERING design ,EARLY childhood education - Abstract
Due to the influence of the Next Generation Science Standards (NGSS), the National Research Council's (NRC) Framework for K-12 Science Education, and a socio-workforce push to increase diverse representation in STEM fields, engineering education has become more prevalent in K-12 classrooms over the past decade. Although this shift is seemingly optimistic, critical consideration must be given to the ways engineering education tends to be reductive and positivistic, mimicking engineering practices decontextualized from high-stakes socio-political and socio-ecological realities through the adherence of a closed, systematic design process. Teaching and learning that is situated within the confines of normative engineering learning fail to nurture and cultivate students' intellectual health and ontological security, and further promotes destructive settler ecologics. This study took up efforts to disrupt and desettle engineering education, which opened space for children to critically speculate about real-world engineering entanglements deeply connected to their futurities. The aims of this paper are to (1) establish the need for anticolonial engineering, and engineering education, (2) promote approaches for doing so (3) and elevate the just worlding engineering design principles put forward by radically caring children committed to socio-ecological and multispecies justice. The learning shared in this paper suggests not only why science and engineering fields and education should be reformed, but also provides guidance for evolving the designing of shared worlds, for kincentric flourishing. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
31. Oligosaccharides production by enzymatic hydrolysis of banana pseudostem pulp
- Author
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Paul Christakopoulos, Sara Díaz, Leonidas Matsakas, Eleni Krikigianni, Zaida Ortega, Florbela Carvalheiro, Antonio N. Benítez, Ulrika Rova, María del Cristo González Marrero, Maria C. Fernandes, and Luís C. Duarte
- Subjects
chemistry.chemical_classification ,biology ,Renewable Energy, Sustainability and the Environment ,Pulp (paper) ,Oligosaccharides ,Bioethanol ,Cellulase ,Agricultural Wastes ,engineering.material ,Biorefinery ,Polysaccharide ,chemistry.chemical_compound ,Hydrolysis ,chemistry ,Enzymatic hydrolysis ,engineering ,biology.protein ,Lignin ,Food science ,Biomass ,Pectinase ,Cellulose - Abstract
Banana production generates significant amounts of agricultural wastes, being fiber extraction one of the most relevant alternatives for their valorization. This process produces banana’s pseudostem pulp (BPP) as a byproduct, which shows an interesting composition for the biorefinery’s biochemical platform, with high polysaccharides (68%) and low lignin contents. This work deals with the enzymatic hydrolysis (EH) of raw and hydrothermally pre-treated BPP, focusing on the production of oligosaccharides (OS). Raw BPP hydrolysis with cellulase at different dosages rendered only 3.2% OS yields (OSY). Pectinase addition has not affected EH performance. On the other hand, EH of hydrothermally pre-treated BPP at 150 °C and 170 °C (P150 and P170) allowed to increase OSY up to 28% (P150, 1 FPU of cellulase/g dry biomass, 12 h), being 72% of the solubilized sugars in the form of cello-oligosaccharides. This last condition was subjected to a multi-stage EH strategy without improvements in OSY. An endo-glucanase was also tested, but obtained OSY were lower than cellulase results. Finally, obtained OS demonstrated to stimulate the growth of two Lactobacilli strains. The results show that BPP pre-treated under mild operational conditions is a good candidate for cello-oligosaccharides production by EH using 1 FPU/g DB of cellulase with a simple strategy. Graphical abstract
- Published
- 2021
32. Methane production and nitrogen mineralization in paddy soil treated with sludge from anaerobic digestion enhanced by hyperthermophilic pretreatment
- Author
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Fumiko Oritate, Masato Nakamura, Taira Hidaka, and Masaru Yamaoka
- Subjects
Environmental Engineering ,Chemistry ,chemistry.chemical_element ,04 agricultural and veterinary sciences ,010501 environmental sciences ,engineering.material ,Pulp and paper industry ,01 natural sciences ,Nitrogen ,Methane ,Anaerobic digestion ,chemistry.chemical_compound ,Digestion (alchemy) ,040103 agronomy & agriculture ,engineering ,0401 agriculture, forestry, and fisheries ,Fertilizer ,Agronomy and Crop Science ,Incubation ,Nitrogen cycle ,Sludge ,0105 earth and related environmental sciences ,Water Science and Technology - Abstract
Hyperthermophilic pretreatment (80 °C, 24 h) is a technology that promotes methane yield in the anaerobic digestion of sewage sludge. However, little information is available on the characteristics of sludge anaerobically digested with hyperthermophilic pretreatment as a fertilizer and on the environmental impact of using the sludge as a fertilizer. In this study, we conducted incubation experiments to examine the characteristics of methane production and nitrogen mineralization in paddy soil treated with sludge from anaerobic digestion that was enhanced by hyperthermophilic pretreatment. Sludge samples digested under 15, 25, 30 and 35 °C with and without hyperthermophilic pretreatment were used. Sixty-mL vials were used in the experiment. Each vial was filled with 5 g of air-dried paddy soil, 10 mL of degassed water and digested sludge. It was then covered with a butyl rubber stopper, its headspace air was replaced by N2, and it was incubated at 30 °C. Methane concentrations in the headspace of the vials were measured after 7, 14, 28, 46, 57, 70 and 84 days. NH4-N concentrations in the soil were also measured after 0, 14, 28 and 84 days. The results indicated that relatively more methane tended to be produced in soil treated with sludge from anaerobic digestion that was enhanced by hyperthermophilic pretreatment than in non-pretreated sludge. On the other hand, a small amount of NH4-N was released from sludge digested with hyperthermophilic pretreatment at all digestion temperatures because organic nitrogen had been decomposed under hyperthermophilic pretreatment. Therefore, the appropriate application rate of sludge digested with hyperthermophilic pretreatment can be determined based on NH4-N in digested sludge without consideration of nitrogen mineralized after application when the sludge is used as a fertilizer.
- Published
- 2019
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- View/download PDF
33. Introductory remarks on the special issue of Optimization and Engineering dedicated to SDEWES 2021 conference.
- Author
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Trafczynski, Marian, Urbaniec, Krzysztof, Mikulčič, Hrvoje, and Duić, Neven
- Abstract
The background of this Special Issue (SI) of the Optimization and Engineering (OPTE) journal is the 2021 Sustainable Development of Energy, Water and Environment Systems (SDEWES) Conference. This broad field was discussed by the participants of the 16th SDEWES Conference held in Dubrovnik, Croatia. This SI aims to bring together articles that discuss recent advances in optimization methods and algorithms that integrate various life-supporting systems. A decision-making problem often appears as a parameter estimation problem; it can be formulated as an optimization model and solved using different optimization algorithms and techniques. All papers included in this OPTE journal SI consider aspects of numerical analysis, mathematical modelling, and computational methods involved in investigating, planning and implementing sustainable development. In this context, the guest editors have confidence that the selected papers and addressed issues will substantially contribute to the increase of the knowledge body published in the OPTE journal, and the SI will be a powerful platform for researchers to discuss, share, and disseminate new ideas. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
34. Technical and environmental improvement of the bleaching sequence of dissolving pulp for fibre production
- Author
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Alberto Coz, Pablo Garcia, Carlos Arce, Tamara Llano, and Universidad de Cantabria
- Subjects
Fock’s reactivity ,Polymers and Plastics ,Intrinsic viscosity ,Pulp (paper) ,Pentosan ,TCF bleaching ,02 engineering and technology ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Kappa number ,Pulp and paper industry ,01 natural sciences ,Peroxide ,0104 chemical sciences ,Viscose ,chemistry.chemical_compound ,chemistry ,engineering ,Lignin ,Environmental improvement ,0210 nano-technology ,Dissolving pulp - Abstract
Reactivity of dissolving pulp is one of the main parameters to determine its availability to be transformed into viscose. It is related to the use of carbon disulphide (CS2). An industrial sequential totally chlorine free bleaching process is used as case study. It is carried out in two stages: (1) Alkaline extraction (EOP) and (2) peroxide bleaching (PO). In order to assess how to decrease the use of carbon disulphide, several experiments were performed at laboratory scale for the two stages mentioned before by modifying the operating conditions: NaOH and H2O2 dosages, time and temperature. Reactivity using a modified Fock’s method and pentosan content was analysed along with quality pulp parameters: α-cellulose, viscosity and lignin content (kappa number). Results showed that reactivity increases through the bleaching process and varies with the chemical dosage in both stages. Pulp obtained at the best conditions had the following characteristics: reactivity, 95.3%; α-cellulose 91.17%; intrinsic viscosity, 448 mL/g; kappa number, 1.81 and pentosan content 2.86%, and as a result, CS2 usage was reduced by 11.88%. At the best conditions obtained in this work, NaOH dosage in PO stage was reduced to zero and temperature was slightly lower, when compared with industrial operating conditions.
- Published
- 2020
35. CHEKG: a collaborative and hybrid methodology for engineering modular and fair domain-specific knowledge graphs.
- Author
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Angelis, Sotiris, Moraitou, Efthymia, Caridakis, George, and Kotis, Konstantinos
- Subjects
KNOWLEDGE graphs ,MODULAR design ,DRONE aircraft ,ENGINEERS ,KNOWLEDGE workers ,ENGINEERING - Abstract
Ontologies constitute the semantic model of Knowledge Graphs (KGs). This structural association indicates the potential existence of methodological analogies in the development of ontologies and KGs. The deployment of fully and well-defined methodologies for KG development based on existing ontology engineering methodologies (OEMs) has been suggested and efficiently applied. However, most of the modern/recent OEMs may not include tasks that (i) empower knowledge workers and domain experts to closely collaborate with ontology engineers and KG specialists for the development and maintenance of KGs, (ii) satisfy special requirements of KG development, such as (a) ensuring modularity and agility of KGs, (b) assessing and mitigating bias at schema and data levels. Toward this aim, the paper presents a methodology for the Collaborative and Hybrid Engineering of Knowledge Graphs (CHEKG), which constitutes a hybrid (schema-centric/top-down and data-driven/bottom-up), collaborative, agile, and iterative approach for developing modular and fair domain-specific KGs. CHEKG contributes to all phases of the KG engineering lifecycle: from the specification of a KG to its exploitation, evaluation, and refinement. The CHEKG methodology is based on the main phases of the extended Human-Centered Collaborative Ontology Engineering Methodology (ext-HCOME), while it adjusts and expands the individual processes and tasks of each phase according to the specialized requirements of KG development. Apart from the presentation of the methodology per se, the paper presents recent work regarding the deployment and evaluation of the CHEKG methodology for the engineering of semantic trajectories as KGs generated from unmanned aerial vehicles (UAVs) data during real cultural heritage documentation scenarios. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
36. Bio-based materials for nonwovens
- Author
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T. Maloney, Paulo Ferreira, and A. S. Santos
- Subjects
Renewable materials ,Bio-based ,Materials science ,Current generation ,Polymers and Plastics ,Polymer science ,Pulp (paper) ,Regenerated cellulose ,Bio based ,engineering.material ,Nonwoven Binders ,Fibers ,Petrochemical ,engineering ,Binders ,Fiber - Abstract
The nonwoven industry is one of the most innovative and important branches of the global fiber products industry. However, the use of petrochemical-based materials in many nonwoven products leads to severe environmental issues such as generation of microplastics. Synthetic material use in nonwovens is currently around 66%. This review covers potential technologies for the use of bio-based materials in nonwoven products. The current generation of nonwoven products relies heavily on the use of synthetic binders and fibers. These materials allow for products with high functional properties, such as permanence, strength, bulk, and haptic properties. The next generation of nonwoven products will have a higher fraction of natural and renewable materials as both binders and fiber elements. There are a wide range of materials under investigation in various nonwoven product categories. Especially, lignocellulosic materials are of interest. This includes traditional pulp fibers, regenerated cellulose fibers, lignin binders and nanomaterials derived from wood. The development of water stable, strong interfiber bonding concepts is one of the main problems to be solved for advancing bio-based nonwoven products.
- Published
- 2021
37. High hydrostatic pressure-assisted extraction of carotenoids from papaya (Carica papaya L. cv. Maradol) tissues using soybean and sunflower oil as potential green solvents
- Author
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Jorge Welti-Chanes, Andrea Gómez-Maqueo, M. Pilar Cano, Sara Lara-Abia, Ministerio de Ciencia e Innovación (España), Instituto Tecnológico y de Estudios Superiores de Monterrey, Consejo Nacional de Ciencia y Tecnología (México), CSIC - Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), and European Commission
- Subjects
0106 biological sciences ,chemistry.chemical_classification ,food.ingredient ,biology ,Sunflower oil ,Pulp (paper) ,Extraction (chemistry) ,Hydrostatic pressure ,food and beverages ,04 agricultural and veterinary sciences ,engineering.material ,biology.organism_classification ,040401 food science ,01 natural sciences ,Sunflower ,Industrial and Manufacturing Engineering ,Soybean oil ,0404 agricultural biotechnology ,food ,chemistry ,010608 biotechnology ,engineering ,Food science ,Carica ,Carotenoid - Abstract
Carotenoids are health promoting compounds which bioavailability depends on their release from the intracellular compartments. The aim of this study was to evaluate the effect of the application of different levels of pressure, time and temperature in High Hydrostatic Pressure-Assisted Extraction (HHPAE) processes, and the use of soybean and sunflower oils on the extraction yield of carotenoids present in papaya pulp and peel. . Papaya (pulp and peel) as source of carotenoids and soybean and sunflower oils as eco-friendly solvents were used. The effects of temperature, pressure and time (20–40 °C, 300–500 MPa and 2–8 min) on the carotenoid extraction yield were studied applying a central composite experimental design. Carotenoids and esters in papaya were analysed by high performance liquid chromatography (HPLC-DAD-MS/MS) and by spectrophotometric methods. The main carotenoids found in carotenoid-rich oils were (all-E)-lycopene, (13Z)-lycopene isomer, β-carotene, (all-E)-β-cryptoxanthin and xanthophyll esters as (all-E)-β-cryptoxanthin caprate, (all-E)-β-cryptoxanthin laurate and (all-E)-β-cryptoxanthin myristate. The optimal extraction condition was obtained at 400 MPa, 40.5 °C for 5 min, with the highest (all-E)-lycopene extraction yield (99.1%) from papaya pulp using soybean oil. The highest (all-E)-β-carotene (14.0%) and (all-E)-β-cryptoxanthin (19.3%) extraction yields were obtained from peel extracts at 500 MPa, 35 °C for 2 min using soybean oil and 400 MPa, 27.5 °C for 5 min using sunflower oil, respectively. The results showed that carotenoid extraction yields in papaya pulp and peel extracts were higher applying mild pressures (300–400 MPa). Low xanthophyll and xanthophyll esters extraction efficiency (0.8–3.1%) was observed due to the low polarity of the vegetable oils., This research was funded by the Spanish Ministry of Science and Innovation (Spain), through project number RTA2015-00044-C02-02 and the Tecnológico de Monterrey, Mexico (FunFoodEmertec). Author Sara Lara-Abia received financial support from Tecnológico de Monterrey (México) (Research Chair Funds CAT-200) and CONACYT-SEP (Research Project 101700 and Doctoral Scholarship no. 895077).
- Published
- 2021
38. From unavoidable food waste to advanced biomaterials: microfibrilated lignocellulose production by microwave-assisted hydrothermal treatment of cassava peel and almond hull
- Author
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Allyn P. Sulaeman, Thomas I.J. Dugmore, Yang Gao, Javier Remón, Avtar S. Matharu, Ministry of Finance (Indonesia), Ministerio de Economía y Competitividad (España), Ministerio de Ciencia e Innovación (España), Engineering and Physical Sciences Research Council (UK), Sulaeman, Allyn P. [0000-0001-8977-2485], Gao, Yang [0000-0001-8233-7747], Dugmore, Tom [0000-0003-3741-0276], Remón, Javier [0000-0003-3315-5933], Matharu, Avtar S. [0000-0002-9488-565X], Sulaeman, Allyn P., Gao, Yang, Dugmore, Tom, Remón, Javier, and Matharu, Avtar S.
- Subjects
Heptane ,Nanocomposite ,Polymers and Plastics ,Almond hulls ,Pulp (paper) ,02 engineering and technology ,engineering.material ,Raw material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Microfibrillated lignocellulose ,0104 chemical sciences ,Crystallinity ,chemistry.chemical_compound ,Adsorption ,Microwave hydrothermal ,chemistry ,Chemical engineering ,Cassava peel ,engineering ,Zeta potential ,Thermal stability ,0210 nano-technology - Abstract
4 figures.-- Supplementary information available., Lignocellulose based nanomaterials are emerging green biosolids commonly obtained from wood pulp. Alternative feedstocks, such as as unavoidable food waste, are interesting resources for nano/microfibers. This research reports the production and characterization of microfibrillated lignocellulose (MFLC) from cassava peel (CP) and almond hull (AH) via acid-free microwave-assisted hydrothermal treatment (MHT) at different temperatures (120–220 °C). During processing, the structural changes were tracked by ATR-IR, TGA, XRD, 13C CPMAS NMR, zeta potential, HPLC, elemental analysis (CHN; carbon, hydrogen and nitrogen), TEM and SEM analyses. The microwave processing temperature and nature of feedstock exerted a significant influence on the yields and properties of the MFLCs produced. The MFLC yields from CP and AH shifted by 15–49% and 31–73%, respectively. Increasing the MHT temperature substantially affected the crystallinity index (13–66% for CP and 36–62% for AH) and thermal stability (300–374 °C for CP and 300–364 °C for AH) of the MFLCs produced. This suggested that the MFLC from CP is more fragile and brittle than that produced from AH. These phenomena influenced the gelation capabilities of the fibers. AH MFLC pretreated with ethanol at low temperature gave better film-forming capabilities, while untreated and heptane pretreated materials formed stable hydrogels at solid concentration (2% w/v). At high processing temperatures, the microfibrils were separated into elementary fibers, regardless of pretreatment or feedstock type. Given these data, this work demonstrates that the acid-free MHT processing of CP and AH is a facile method for producing MFLC with potential applications, including adsorption, packaging and the production of nanocomposites and personal care rheology modifiers., PS would like to thank Lembaga Pengelola Dana Pendidikan (LPDP) scholarship, Ministry of Finance, Indonesia, for financial support for PhD study under the guidance of ASM. JR would like to express his gratitude to the Spanish Ministry of Science, Innovation and Universities for the Juan de la Cierva fellowships (FJCI-2016-30847 and IJC2018-037110-I) awarded. ASM acknowledges the EPSRC (Whole systems understanding of unavoidable food supply chain wastes for re-nutrition EP/P008771/1) for funding TD for Postdoctoral study.
- Published
- 2021
39. Fictional Film in Engineering Ethics Education: With Miyazaki’s The Wind Rises as Exemplar.
- Author
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Hitt, Sarah Jayne and Lennerfors, Thomas Taro
- Abstract
This paper aims to call attention to the potential of using film in engineering ethics education, which has not been thoroughly discussed as a pedagogical method in this field. A review of current approaches to teaching engineering ethics reveals that there are both learning outcomes that need more attention as well as additional pedagogical methods that could be adopted. Scholarship on teaching with film indicates that film can produce ethical experiences that go beyond those produced by both conventional methods of teaching engineering ethics and more arts-based methods such as fiction, as well as connect ethics learning outcomes and issues to the lifeworld of a person. The paper further illustrates the potential of using Miyazaki Hayao’s film The Wind Rises for highlighting a range of ethical issues pertaining to engineering. It also discusses the important role educators play in how film can be used effectively in the classroom. Synthesizing a range of sources from film theory to the use of film in business and medical education, the paper makes the case for using film in engineering ethics education and calls for more research on the use of this method. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
40. Varieties of Metalinguistic Negotiation.
- Author
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Plunkett, David and Sundell, Timothy
- Subjects
NEGOTIATION ,ENGINEERING - Abstract
In both co-authored and solo-authored work over the past decade, we have developed the idea of "metalinguistic negotiation". On our view, metalinguistic negotiation is a type of dispute in which speakers appear to use (rather than explicitly mention) a term in conflicting ways to put forward views about how that very term should be used. In this paper, we explore four possible dimensions of variation among metalinguistic negotiations, and the interactions among those dimensions. These types of variation matter for understanding the nature, and the potential range, of the phenomenon of metalinguistic negotiation. As an illustration of the latter, we argue in our concluding section that understanding the full range of forms that metalinguistic negotiations can take has implications for debates about the "implementation" of conceptual engineering proposals. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
41. A Multi-layered Illustration of Exemplary Business Ethics Practices with Voices of the Engineers in the Health Products Industry.
- Author
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Kim, Dayoung and Hess, Justin L.
- Subjects
BUSINESS ethics ,ENGINEERS ,HEALTH products ,ORGANIZATIONAL aims & objectives ,VALUES (Ethics) ,ORGANIZATIONAL ethics ,ENGINEERING ethics - Abstract
Promoting ethical practice within an organization has been a continuous challenge in the business ethics community. To enrich organizational practices for promoting business ethics across an organization, this paper aims to introduce the voices of practitioners working in organizations that offer exemplary practices. Based on semi-structured interviews with 21 engineers working in the health products industry, we identified 12 pervasive ethical values that we grouped to four categories: fiduciary, economic, engineering, and process values. As ethics has been embraced as a core element of the ethical practice of our study participants regardless of their rankings and roles in their organizations, we investigated organizational strategies for promoting ethical practice. We identified four categories of organizational strategies: symbols, memberships, practices, and systems. Each strategy affected the 12 ethical values in different ways. Lastly, we identified three characteristics of the industry contexts that appeared to influence ethical values: customer impact, economic norms, and highly regulated industry. We discuss how the findings from this paper can potentially promote new discussions and practices in the business ethics community. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
42. Understanding the Influence of User Participation and Involvement on System Success - a Systematic Mapping Study.
- Author
-
Abelein, Ulrike and Paech, Barbara
- Subjects
COMPUTER software development ,COMPUTER software ,COMPUTER systems ,SOFTWARE engineering ,ENGINEERING - Abstract
User participation and involvement in software development are considered to be essential for a successful software system. Three research areas, human aspects of software engineering, requirements engineering, and information systems, study these topics from various perspectives. We think it is important to analyze user participation and involvement in software engineering comprehensively to encourage further research in this area. We investigate the evidence on effects of user participation and involvement on system success and we explore which methods are available in literature. A systematic mapping study was conducted. The systematic search yielded 3,698 hits, from which we identified 289 unique papers. These papers were reviewed by the first author based on inclusion and exclusion criteria. The second author validated the selection of papers by reviewing the reasons for exclusion and inclusion and the corresponding papers on a sample base. 58 of the 289 papers were selected (22 statistical survey and meta-study papers and 36 methods papers). Based on the empirical evidence of the surveys and meta-studies, we developed a meta-analysis of structural equation models. This overview demonstrates that most papers showed positive correlations between aspects of development processes (including user participation) and human aspects (including user involvement) and system success. The analysis of the proposed solutions from the method papers revealed a wide variety of user participation and involvement practices for most activities within software development. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
43. Foreword: special issue on innovation, communication and engineering.
- Author
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Bhushan, Bharat
- Subjects
ENGINEERING ,ARCHITECTURAL engineering ,MECHANICAL engineers ,GREEN technology ,MECHANICAL engineering ,COMPUTER science - Abstract
The papers covered a wide range of fundamental studies, industrial practices, and engineering innovations by applying knowledge on microsystems. Authors of selected papers from the conference were invited to submit full length papers for possible inclusion in this special issue of Microsystem Technologies (MST). This special issue on Innovation, Communication and Engineering consists of selected papers presented at the International Conference on "Innovation, Communication and Engineering", in 2018.The conference covered broad topics, including information science, innovation design, industrial design, applied mathematics, computer science, cultural and creative research, electrical and electronic engineering, mechanical engineering, automation engineering, green technology and architectural engineering, material science, and other related fields. [Extracted from the article]
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- 2022
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44. A Cultural-historical Critique of How Engineering Knowledge is Constructed Through Research in Play-based Settings: What Counts as Evidence and What is Invisible?
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Fleer, Marilyn
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KNOWLEDGE gap theory ,ENGINEERING education ,PRESCHOOL children ,ENGINEERING - Abstract
It is reported that engineering for play-based settings is a new body of knowledge under debate and contradictory. Many studies show how play-based settings are full of engineering possibilities for young children, whilst others have identified missed engineering teaching possibilities. In order to better understand the research, this paper answers the questions, 'How is engineering knowledge being constructed through research into play-based settings?', and 'What do the results show for practice and future engineering research for preschool settings?' To answer these questions, a critique of those studies which focused on engineering education in play-based settings was undertaken. By examining existing studies in relation to the study designs and the results, this paper reports on how categories of engineering knowledge were established and how knowledge was constructed for engineering education for play-based settings. Using cultural-historical theory, the results show that studies of play-based setting have primarily been guided by practices from only some engineering professions, knowledge construction is based on both pre-defined and emergent categories, and research has tended to focus mostly on constructing (e.g. blocks). Gendered engineering knowledge was also identified, suggesting only partial understandings of engineering education evident. The critique not only identified knowledge construction that positively contributes to scholarship but also found gaps in what was being studied, thereby contributing to research by cautioning against full acceptance of the existing analytical concepts in the literature and suggesting that the building of a broader set of analytical categories for future research is needed. [ABSTRACT FROM AUTHOR]
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- 2022
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45. Recent advances in strategies of nanocellulose surface and/or interface engineering for potential biomedical applications as well as its ongoing challenges: a review.
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Jiao, Haixin, Sun, Jianzhong, Shi, Yifei, Lu, Xuechu, Ali, Sameh Samir, Fu, Yinyi, Zhang, Hongxing, Li, Yan, Wang, Qianqian, Zhou, Mengbo, and Liu, Jun
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BIOMATERIALS ,SURFACE chemistry ,SURFACE properties ,BIOMASS ,CELL adhesion ,BIOCOMPATIBILITY ,ENGINEERING - Abstract
Nanocellulose, as a native renewable material extracted from cellulosic biomass, has gained increased attention in biomedical applications due to its unique physical features, biocompatibility, low toxicity, and modifiable surface chemistry. However, as a candidate for biomedical uses, native nanocellulose still has some limitations, including mechanical properties that are incomparable to those of natural tissues, a lack of biodegradability in vivo, and insufficient cell adhesion support, all of which prevent the widespread use of nanocellulose in the biomedical field. Recently, surface or interface engineering has been advocated as a promising strategy for tailoring the bioactivities and physiochemical properties of native nanocellulose for specific biomedical applications. This review paper focuses on recent advances in nanocellulose surface and/or interface engineering strategies for potential biomedical applications. The features of native nanocellulose that are similar to those of biomaterials have been emphasized. It also proposed a roadmap for the development of nanocellulose-based biomaterials, along with bottlenecks and prospects. This review paper emphasizes a new concept for nanocellulose-based biomaterials development strategies based on nanocellulose surface and interface properties for potential biomedical applications. [ABSTRACT FROM AUTHOR]
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- 2023
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46. Engineering Vehicles Detection for Warehouse Surveillance System Based on Modified YOLOv4-Tiny.
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Xiang, Xuezhi, Meng, Fanda, Lv, Ning, and Yin, Hang
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WAREHOUSES ,CONVOLUTIONAL neural networks ,ENGINEERING ,OBJECT recognition (Computer vision) - Abstract
The engineering vehicle detection is a key issue for the raw material warehouse scenes. Through the engineering vehicle detection, the working conditions of engineering vehicles in the raw material warehouse can be intelligently managed to prevent large-scale smoke pollution and the danger of smoke and dust. In this paper, we propose an intelligent method based on the framework of YOLOv4-Tiny for locating and identifying the engineering vehicles. In our detection task, the monitoring scenes are complex with a lot of interference. And the scope of monitoring is large. In order to solve these challenging problems, we introduce the Split-attention module to the network, which can adaptively extract important information of the image and improve the receptive field of detection. In addition, we introduce the Dynamic ReLU function to the network, which allow the network to adaptively learn more suitable ReLU parameters based on the input. We also collect a large number of images obtained from the front-end cameras and create a self-built dataset of engineering vehicles. In this paper, we test our method on the COCO dataset and the self-built engineering vehicle dataset. Experimental results show that our method proposed in this paper can detect engineering vehicles with higher accuracy and faster speed, which can be used for engineering vehicle detection in the scenes of raw material storage warehouses. [ABSTRACT FROM AUTHOR]
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- 2023
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47. Ammonia volatilization from Vietnamese acid sulfate paddy soil following application of digested slurry from biogas digester
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Fumiko Oritate, Yoshito Yuyama, Masaru Yamaoka, Nguyen Phuoc Dan, Masato Nakamura, and Dang Vu Bich Hanh
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inorganic chemicals ,Environmental Engineering ,Acid sulfate soil ,Environmental pollution ,04 agricultural and veterinary sciences ,010501 environmental sciences ,engineering.material ,Ammonia volatilization from urea ,Pulp and paper industry ,complex mixtures ,01 natural sciences ,Anaerobic digestion ,Agronomy ,parasitic diseases ,Soil water ,040103 agronomy & agriculture ,engineering ,Slurry ,0401 agriculture, forestry, and fisheries ,Environmental science ,Sewage treatment ,Fertilizer ,Agronomy and Crop Science ,0105 earth and related environmental sciences ,Water Science and Technology - Abstract
In some areas of Vietnam, digested slurry from biogas digesters is discharged into canals without wastewater treatment. In order to reduce environmental pollution, utilization of digested slurry as a fertilizer in paddy fields is one promising measure. NH3 in the digested slurry is easily volatilized after application. Therefore, NH3 volatilization is a key factor for fertilizer design. In this study, we conducted laboratory experiments to examine the characteristics and mechanism of NH3 volatilization from Vietnamese paddy soil (acid sulfate soil) following application of digested slurry with the overall goal of evaluating digested slurry as a fertilizer. Incubation experiments under flooded conditions were conducted with Vietnamese acid sulfate soil and Japanese soil. Six fertilizer treatments were carried out, namely Vietnamese soil with no fertilizer, Vietnamese soil with urea, Vietnamese soil with digested slurry, Vietnamese soil with half the amount of digested slurry, Japanese soil with no fertilizer, and Japanese soil with digested slurry. pH, NHx–N, and SO4 2− in the floodwater and NH3 volatilization fluxes were measured for 1 week after application of digested slurry or urea. The results indicated that the amount of NH3 volatilization in Vietnamese soil is small compared to Japanese soil because the pH of floodwater from Vietnamese soil remains low (3.7–7.6) due to oxidation of pyrite, and this low pH inhibits NH3 volatilization. Therefore, we conclude that NHX–N in digested slurry can be efficiently utilized as a fertilizer in Vietnamese paddy fields with acid sulfate soils. Moreover, the results also indicate that relatively more NH3 is volatilized even in Vietnamese soil by the slowdown in pyrite oxidation and the buffering capacity of digested slurry when much digested slurry is applied. Therefore, NH3 volatilization can be reduced using methods such as a split application to maintain low floodwater pH.
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- 2017
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48. Harvesting Energy Using Compost as a Source of Carbon and Electrogenic Bacteria
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Chandrasekhar Kuppam, Fabio Flagiello, Edvige Gambino, and Rosa Anna Nastro
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Microbial fuel cell ,biology ,Compost ,Open-circuit voltage ,Microbial fuel cells ,chemistry.chemical_element ,engineering.material ,Raw material ,biology.organism_classification ,Pulp and paper industry ,Cathode ,law.invention ,chemistry ,law ,engineering ,Waste-to-energy systems ,Compost, Microbial fuel cells, Voltage reversal, Waste management, Waste-to-energy systems ,Voltage reversal ,Soil fertility ,Carbon ,Waste management ,Bacteria - Abstract
Compost is widely used to improve soil fertility for its chemical–physical properties, with particular regard to the abundance of humic substances. Compared to the untreated organic solid waste, the use of compost in microbial fuel cells (MFCs) could offer different advantages like the strong reduction of fermentative processes. The use of compost in MFCs in combination with soil or mixed with other substrates had been reported by some researchers to improve the performance of MFCs fed with agro-industrial residues and plant MFCs. In this chapter, we report the results of an experiment carried out using a compost of vegetable residues as feedstock in a single chamber, air cathode MFCs. We investigated the behavior of two MFCs serially connected, the possibility to use compost as a long-term source of energy in MFCs, the influence of cathode surface/cell volume ratio on MFCs performance in terms of power and current density. Our results showed for MFCs serially connected a maximum PD and CD of 234 mW/m2 and 1.6 A/m2, respectively, with a maximum OCV of 557 mV. Unexpectedly, the compost-based MFCs kept significant electric outputs (854 mV, 467 mW/m2 kg, and 114 mA/m2 kg) after being reactivated 2 years later its set-up, thus demonstrating its potential as long-term operation energy system.
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- 2020
49. Enhancing packaging board properties using micro- and nanofibers prepared from recycled board
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Terhi Suopajärvi, Henrikki Liimatainen, and Ossi Laitinen
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business.product_category ,Materials science ,Polymers and Plastics ,Fine friction grinding ,Pulp (paper) ,Deep eutectic solvents ,engineering.material ,Grinding ,Deep eutectic solvent ,Reinforcement ,chemistry.chemical_compound ,chemistry ,Boxboard ,Cellulose nanofibers ,Nanofiber ,Pulverizer ,Microfiber ,Microfibers ,engineering ,Composite material ,Cellulose ,business ,Choline chloride ,Nanocellulose - Abstract
In this study, cellulose microfibers and cellulose nanofibers (CNF) prepared from recycled boxboard pulp using a mechanical fine friction grinder were used as reinforcements in a board sheet. Micro- and nanofibers manufactured by mechanical grinding have typically broad particle size distribution, and they can contain both micro- and nano-sized fibrils. Deep eutectic solvent of choline chloride and urea was used as a non-hydrolytic pretreatment medium for the CNF, and reference CNF were used without any chemical pretreatment. The CNF were ground using three grinding levels (grinding time) and their dosage in the board varied from 2 to 6 wt%. The results indicate that the board properties could be tailored to obtain a balance between the processability and quality of the products by adjusting the amount of CNF that was added (2–6 wt%). A preliminary cost assessment indicated that the most economical way to enhance the board strength properties was to add around 4% of CNF with a moderate grinding level (i.e., grinding energy of 3–4 kWh/kg). Overall, the strength properties of the manufactured board sheets improved by several dozen percentages when CNF was used as the reinforcement.
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- 2020
50. Use of green solvents as pre-treatment of dissolving pulp to decrease CS2 consumption from viscose production
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Alberto Coz, Carlos Arce, Tamara Llano, Sara González, and Universidad de Cantabria
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Polymers and Plastics ,Chemistry ,Pulp (paper) ,Deep eutectic solvents ,Reactivity ,02 engineering and technology ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Lactic acid ,Solvent ,chemistry.chemical_compound ,Crystallinity ,engineering ,Lignin ,Viscose ,0210 nano-technology ,Dissolving pulp ,Nuclear chemistry ,Choline chloride - Abstract
Choline chloride-based deep eutectic solvents are widely used in biomass processing. In this work, four different green solvent mixtures were used as pre-treatment of acid sulphite dissolving pulp with the hypothesis of increasing the possibilities to produce viscose fibres and decreasing the use of the harmful and toxic carbon disulphide in the process. The experiments were performed at two different pulp to solvent mass ratios. Pulp quality parameters were also measured to determine the suitability of the pre-treatment: α-cellulose, viscosity, lignin and pentosan content. In addition, X-ray diffraction analysis of pulps at the best solid to liquid ratio was performed to obtain the influence of the crystallinity index. Best results were obtained with the use of lactic acid, with reactivity values close to 94%, giving a reduction of CS2 usage of 15.83%. Furthermore, a linear relationship between the crystallinity index calculated by the XRD and reactivity with a regression factor of 0.87 was found.
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- 2020
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