Theory and Technology of Semisolid Metal Molding

2008 ◽  
Vol 141-143 ◽  
pp. 9-16 ◽  
Author(s):  
Frank Czerwinski

Fundamentals of semisolid metal molding, including the particulate feedstock, methods of its generation and features that make it useful for processing, are outlined. Melting characteristics of the feedstock under sole influence of heat are considered, covering a wide range of microstructural and microchemical factors, believed to be of importance at high temperatures. The generation of the thixotropic slurry within the injection molding system and its solidification behaviour are accompanied by detailed features of the molded structures and their correlation with properties of net-shape components. In addition to conventional techniques the novel processing concepts including near-liquidus molding, semisolid extrusion molding as well as the alloy and composite generation in a semisolid state are described. An update on commercialization progress is completed by a characterization of the modern equipment used for process implementation with broad references to metal die casting and plastics injection molding.

Author(s):  
Shuangyi Li

The Franco-Chinese migrant writer François Cheng (Grand Prix de la francophonie de l’Académie française 2001) is the first French Academician of Asian origin. His French- language novel Le Dit de Tianyi (Prix Femina 1998, rather differently translated into English as The River Below) recounts the protagonist’s life trajectory across the turbulent twentieth century, from wartime China to France and back to a radically changed Communist China. The protagonist’s cross-cultural and often painful migrant experience largely mirrors that of the author, yet with the final part of the novel being completely fictional. The novel’s generic and stylistic hybridity demonstrates the author’s strenuous effort to investigate the literary possibilities of comparatively incorporating both Western and Eastern cultural heritages in the creative process. Although Le Dit is not formally categorized as a travelogue, travel motifs permeate the novel. The tripartite structure – ‘epic of departure’, ‘detouring journey’, ‘myth of return’ – is redolent of established models of travel since Odyssey. The characterization of the protagonist as a ‘wandering soul’ (âme errante) going on artistic pilgrimages as well as arduous quests for knowledge both in China and to the West, further complemented by the constant longing and attempt to be reunited with loved ones, is among the key features of travel writing largely shared by both Western and Chinese traditions. These travel motifs interact dynamically with the fundamental conception of the novel as both a Bildungsroman and Künstlerroman that linguistically translates, epistemically transforms, and spiritually transcends the individual’s experience of migrance (migration and errance). Such an interaction, then, inspires informed imagination and provokes lateral thinking about cultural representations, and entails a transcultural aesthetic that simultaneously revisits two great cultural heritages, engendering something ‘new’, or indeed, ‘old’. Drawing on theories of cultural translation (initiated notably by Homi Bhabha) and transculturality (Graham Huggan; Wolfgang Welsch), this article examines how the wide range of travel motifs function as a consistent structural and thematic frame and bring frictional qualities and effects to Cheng’s translingual novel. And I argue that these travel motifs ultimately create a liminal space where both European and Chinese literary and artistic traditions are set in motion towards a planetarian possibility of cultural ‘transcendence’ (Cheng’s own word).


1991 ◽  
Vol 232 ◽  
Author(s):  
Chong-Man Yun ◽  
Seung-Ki Lee ◽  
Min-Koo Han ◽  
Mun-Soo Yun

ABSTRACTThis paper proposes the novel processing technique on the formation of InSb thin film which may not be influenced by the vapor pressure difference between In and Sb. Three layers which are composed of In with 1000 A of thickness, Sb with 5000 A and In with 4000 A are deposited sequentially at room temperature. During post heat treatment of these layers, InSb compound phase begins to form and the outer In layer suppresses the reevaporation of more volatile material, Sb. Since multiple single layers are sequentially evaporated, the problem of the severe vapor pressure difference betweentwoevaporating materialsmaynotcontributetothestoichiometriccomposition which may be the most critical parameter to determine the quality of films. The characterization of a fabricated InSb thin film by X-ray diffraction and scanning electron microscope shows that the proposed multilayer method may be a powerful technique to form a high quality InSb compound thin film.


2020 ◽  
pp. 71-109
Author(s):  
Karim Mattar

This chapter provides a new reading of Abdelrahman Munif’s five-volume epic of Gulf petro-modernity, Cities of Salt, in the context of the world literature debate. Considering how this novel has been framed for international audiences since its translation into English, I start with John Updike’s response to Munif as “insufficiently Westernized” to have produced a novel. This response, I argue, is symptomatic of a world literature that conceives of “the literary” only according to “Western” norms and models. I then offer a corrective based on what I show to be Munif’s spectral characterization of Bedouin resistance leader Miteb al-Hathal. A “shabaḥ” (specter), this figure hovers at the interstices of modern oil state that had overwritten or incorporated his world, and, unassimilable, haunts it – indeed, the novel – with the revolutionary memory of its own abuses. Drawing on a wide range of primary and secondary sources, I trace Munif’s spectral inf(l)ection of novelistic form through a discussion of questions of indigeneity; Bedouin oral poetic tradition; and the dialectics of Gulf “petro-modernity” in relation to Bedouin history, politics, and culture. In sum, this chapter articulates the linkage between world literature, Orientalism, modernity, the novel, and spectrality at the heart of this book.


Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3519
Author(s):  
Dalius Jucius ◽  
Rimantas Gudaitis ◽  
Algirdas Lazauskas ◽  
Viktoras Grigaliūnas

Transparent polymer layers that heal minor scratches and maintain the optical properties of the devices for a long time are highly desirable in optoelectronics. This paper presents the results of the electrical characterization of thin PEDOT:PSS films on the novel, optically transparent thiol–ene substrates capable of healing scratches under room-temperature conditions. Electrical properties of the PEDOT:PSS films deposited on the conventional alumina ceramic substrates were also tested for comparative purposes. This study demonstrated that the substrate can have a significant effect on the electrical properties of PEDOT:PSS films, and the electrical resistance of the films on thiol–ene substrates is not as stable as on alumina ceramics. However, the changes in electrical resistance of the films on thiol–ene are small enough over a sufficiently wide range of operating temperatures and relative humidities and allow the application of such bilayers in various polymeric optoelectronic devices.


Polymer Chemistry: A Practical Approach in Chemistry has been designed for both chemists working in and new to the area of polymer synthesis. It contains detailed instructions for preparation of a wide-range of polymers by a wide variety of different techniques, and describes how this synthetic methodology can be applied to the development of new materials. It includes details of well-established techniques, e.g. chain-growth or step-growth processes together with more up-to-date examples using methods such as atom-transfer radical polymerization. Less well-known procedures are also included, e.g. electrochemical synthesis of conducting polymers and the preparation of liquid crystalline elastomers with highly ordered structures. Other topics covered include general polymerization methodology, controlled/"living" polymerization methods, the formation of cyclic oligomers during step-growth polymerization, the synthesis of conducting polymers based on heterocyclic compounds, dendrimers, the preparation of imprinted polymers and liquid crystalline polymers. The main bulk of the text is preceded by an introductory chapter detailing some of the techniques available to the scientist for the characterization of polymers, both in terms of their chemical composition and in terms of their properties as materials. The book is intended not only for the specialist in polymer chemistry, but also for the organic chemist with little experience who requires a practical introduction to the field.


This book explores the value for literary studies of relevance theory, an inferential approach to communication in which the expression and recognition of intentions plays a major role. Drawing on a wide range of examples from lyric poetry and the novel, nine of the ten chapters are written by literary specialists and use relevance theory both as an overall framework and as a resource for detailed analysis. The final chapter, written by the co-founder of relevance theory, reviews the issues addressed by the volume and explores their implications for cognitive theories of how communicative acts are interpreted in context. Originally designed to explain how people understand each other in everyday face-to-face exchanges, relevance theory—described in an early review by a literary scholar as ‘the makings of a radically new theory of communication, the first since Aristotle’s’—sheds light on the whole spectrum of human modes of communication, including literature in the broadest sense. Reading Beyond the Code is unique in using relevance theory as a prime resource for literary study, and is also the first to apply the model to a range of phenomena widely seen as supporting an ‘embodied’ conception of cognition and language where sensorimotor processes play a key role. This broadened perspective serves to enhance the value for literary studies of the central claim of relevance theory: that the ‘code model’ is fundamentally inadequate to account for human communication, and in particular for the modes of communication that are proper to literature.


2021 ◽  
Vol 22 (4) ◽  
pp. 2104
Author(s):  
Pedro Robles ◽  
Víctor Quesada

Eleven published articles (4 reviews, 7 research papers) are collected in the Special Issue entitled “Organelle Genetics in Plants.” This selection of papers covers a wide range of topics related to chloroplasts and plant mitochondria research: (i) organellar gene expression (OGE) and, more specifically, chloroplast RNA editing in soybean, mitochondria RNA editing, and intron splicing in soybean during nodulation, as well as the study of the roles of transcriptional and posttranscriptional regulation of OGE in plant adaptation to environmental stress; (ii) analysis of the nuclear integrants of mitochondrial DNA (NUMTs) or plastid DNA (NUPTs); (iii) sequencing and characterization of mitochondrial and chloroplast genomes; (iv) recent advances in plastid genome engineering. Here we summarize the main findings of these works, which represent the latest research on the genetics, genomics, and biotechnology of chloroplasts and mitochondria.


HLA ◽  
2021 ◽  
Author(s):  
Maria Loginova ◽  
Olga Makhova ◽  
Daria Smirnova ◽  
Igor Paramonov ◽  
Maksim Zarubin

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