1,721,147 research outputs found
A comprehensive review on the machining process: unconventional as an alternative to conventional machining
Full text linkCutting/machining has been an integral part of human civilization since the beginning of the Stone Age. With time the cutting tools have evolved but the methods of cutting/machining remain the same. Thus, typical machining techniques lack several characteristics, such as material compatibility, difficulty in working with, inability to manufacture varied sizes and shapes, and so on. Thus, there have been introduced unconventional machining processes that can be used to cut various composite materials, make them easier to operate and machine complex shapes, etc. This chapter focuses on why unconventional machining processes can be an expedient alternative to conventional machining.</p
Challenges and Opportunities in Additive Manufacturing in Defence Applications
No full textIn recent years, Additive Manufacturing (AM) has gained significant attention due to its versatility and low-waste production cycle. Additive manufacturing fabricates complex, intricated structures and miniaturized shapes with high dimensional accuracy, tailored properties, multiple materials in a single part, and colour aesthetics. many solid-state and liquid-state AM techniques are available to achieve specific mechanical properties while simultaneously providing thermal and structural stability. Powder bed fusion (PBF) and direct energy deposition (DED) have the potential to make components for the defence and industrial sectors. The part production speed with AM techniques limits the application in mass production. The process involved in this technique is limited to polymers and non-metals for processing, and defects due to the liquid-solid interface need a lot of research to be done. The proposed chapter describes the role of AM in the defence sector and the challenges involved
Atomic and Near-atomic Scale Additive Manufacturing: Past, Present, and Future Outlook
No full textThe next stage of micro manufacturing is nano and atomic scale manufacturing. A state-of-the-art approach to manufacturing, atomic and near-atomic scale additive manufacturing (ACSM) seeks to manipulate materials at the atomic or near-atomic level to produce next-generation goods with previously unheard-of precision. Currently, facility for manufacturing and machining at nano and atomic scale is in developing stage, the technique used in the atomic force microscope giving a positive hope to develop a facility for machining a material or deposited a material. The historical evolution from craft-based manufacturing (millimetre precision) and precision-controllable manufacturing (micrometre to nanometre accuracy) to atomic-scale precision is built upon by this field, which is frequently referred to as Manufacturing III. An outline of ACSM is provided here, with an emphasis on current advancements, methods, uses, and difficulties, especially about additive manufacturing. The ACSM is a next stage of industrial revolution
Introduction to bio-based materials
No full textBio-based materials can be defined as goods that are primarily made of a substance or compounds obtained from biomass, which can exist naturally or be synthesized. They can also be products of processes that employ biomass. Strictly speaking, a lot of everyday materials, such as paper, wood, and leather, can be called bio-based materials; nevertheless, the phrase is usually used to describe contemporary materials that have undergone more intensive processing. Biocomposites, solvents, polymers, and bulk chemicals are among the materials derived from biomass sources. The numerous methods used to transform biomass components into fuels and products with added value fall into one of two general categories: thermochemical or biochemical. Additionally, conventional enzyme separation, fermentation, and plant breeding—the three primary biotechnological processes—are employed. Although this claim is being extensively examined, bio-based materials are thought to offer potentially greener substitutes than their petroleum-based competitors. Emerging bio-based materials that could rival traditional materials are a constant source of innovation, and the possibilities for incorporating them into both new and established goods are only now being investigated
Steric aging analysis of rejuvenated recycled asphalt binders and mixtures during one-year of storage time
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
sj-docx-2-pie-10.1177_09544089231170999 - Supplemental material for Parametric optimization and ranking analysis of basalt fiber–marble dust particulates–polyamide 66 polymer composites under dry sliding wear investigation
No full textSupplemental material, sj-docx-2-pie-10.1177_09544089231170999 for Parametric optimization and ranking analysis of basalt fiber–marble dust particulates–polyamide 66 polymer composites under dry sliding wear investigation by Ravi Prakash Sharma, Ankit Sharma, Sudhanraj Jeganmohan, Mukesh Kumar and Ashiwani Kumar in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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