Controlling electromigration to selectively form thin metal wires and metal microspheres

2008 ◽  
Vol 23 (11) ◽  
pp. 3122-3128 ◽  
Author(s):  
Masumi Saka ◽  
Kei Kato ◽  
Hironori Tohmyoh ◽  
Yuxin Sun

Guidelines for selecting the shape formed by metal discharged from a narrow Al line were developed. By controlling electromigration in the line, either relatively large microspheres, thin wires, or relatively small microspheres could be formed. Our starting point was a passivated polycrystalline Al line with a slit and small holes at the anode end of it. In the discussion, we describe how the temperature of a part of a wire, T*, at the moment when the part is completely discharged from the hole, affects the shape of the microstructural feature formed from the metal. High, intermediate, and low values of T* were found to correspond to the formation of large microspheres, thin wires, and small microspheres, respectively. The experimental results are explained in the discussion.

2012 ◽  
pp. 66-80
Author(s):  
Michał Mrozowicki

Michel Butor, born in 1926, one of the leaders of the French New Novel movement, has written only four novels between 1954 and 1960. The most famous of them is La Modification (Second thoughts), published in 1957. The author of the paper analyzes two other Butor’s novels: L’Emploi du temps (Passing time) – 1956, and Degrés (Degrees) – 1960. The theme of absence is crucial in both of them. In the former, the novel, presented as the diary of Jacques Revel, a young Frenchman spending a year in Bleston (a fictitious English city vaguely similar to Manchester), describes the narrator’s struggle to survive in a double – spatial and temporal – labyrinth. The first of them, formed by Bleston’s streets, squares and parks, is symbolized by the City plan. During his one year sojourn in the city, using its plan, Revel learns patiently how to move in its different districts, and in its strange labyrinth – strange because devoid any centre – that at the end stops annoying him. The other, the temporal one, symbolized by the diary itself, the labyrinth of the human memory, discovered by the narrator rather lately, somewhere in the middle of the year passed in Bleston, becomes, by contrast, more and more dense and complex, which is reflected by an increasinly complex narration used to describe the past. However, at the moment Revel is leaving the city, he is still unable to recall and to describe the events of the 29th of February 1952. This gap, this absence, symbolizes his defeat as the narrator, and, in the same time, the human memory’s limits. In Degrees temporal and spatial structures are also very important. This time round, however, the problems of the narration itself, become predominant. Considered from this point of view, the novel announces Gerard Genette’s work Narrative Discourse and his theoretical discussion of two narratological categories: narrative voice and narrative mode. Having transgressed his narrative competences, Pierre Vernier, the narrator of the first and the second parts of the novel, who, taking as a starting point, a complete account of one hour at school, tries to describe the whole world and various aspects of the human civilization for the benefit of his nephew, Pierre Eller, must fail and disappear, as the narrator, from the third part, which is narrated by another narrator, less audacious and more credible.


F1000Research ◽  
2018 ◽  
Vol 7 ◽  
pp. 431
Author(s):  
Mike L. Smith ◽  
Andrzej K. Oleś ◽  
Wolfgang Huber

The Bioconductor Gateway on the F1000Research platform is a channel for peer-reviewed and citable publication of end-to-end data analysis workflows rooted in the Bioconductor ecosystem. In addition to the largely static journal publication, it is hoped that authors will also deposit their workflows as executable documents on Bioconductor, where the benefits of regular code testing and easy updating can be realized. Ideally these two endpoints would be met from a single source document. However, so far this has not been easy, due to lack of a technical solution that meets both the requirements of the F1000Research article submission format and the executable documents on Bioconductor. Submission to the platform requires a LaTeX file, which many authors traditionally have produced by writing an Rnw document for Sweave or knitr. On the other hand, to produce the HTML rendering of the document hosted by Bioconductor, the most straightforward starting point is the R Markdown format. Tools such as pandoc enable conversion between many formats, but typically a high degree of manual intervention used to be required to satisfactorily handle aspects such as floating figures, cross-references, literature references, and author affiliations. The BiocWorkflowTools package aims to solve this problem by enabling authors to work with R Markdown right up until the moment they wish to submit to the platform.


2014 ◽  
Vol 4 (7) ◽  
pp. 58-74
Author(s):  
Raquel Marta

Sublinhando as formas fundamentais da subjectividade subjacentes à intervenção do assistente social, o presente artigo explora diferentes contributos para a ética no serviço social contemporâneo. O trabalho do filósofo alemão Fichte fornece-nos o ponto de partida para a incorporação da imaginação e da liberdade no pensar ético. O acto da invenção criativa não é um acto solitário, mas antes um acto animado na e pela relação com o Outro. Nesta relação, a atenção ao contexto, ao instante, ao acontecimento e à singularidade que contribuem para o pensar e o agir ético do assistente social são ainda considerados sob diferentes perspectivas. Underlining the fundamental forms of subjectivity implicit on the of social work intervention, this article explores different contributions to contemporary social ethics. The work of the German philosopher Fichte provides a starting point from which to incorporate imagination and freedom in ethical thinking. The act of creative invention is not a solitary act, but developed in and through the relation with the Other. In this relation, attention to the context, to the moment and uniqueness of the ethical event are also considered as contributes to the social worker ethical thinking and action.


Author(s):  
Kenneth Prewitt

This chapter demonstrates how assumptions of racial superiority and inferiority tightly bound together statistical races, social science, and public policy. The starting point of this is constitutional language. The U.S. Constitution required a census of the white, the black, and the red races. Without this statistical compromise there would not have been a United States as it is today. In the early censuses slaves were counted as three-fifths of a person, a ratio demanded by slaveholder interests as the price of joining the Union. A deep policy disagreement at the moment of founding the nation was resolved in the creation of a statistical race. Later in American history the reverse frequently occurred. Specific policies—affirmative action, for example—took the shape they did because the statistical races were already at hand.


2012 ◽  
Vol 3 (1) ◽  
pp. 12-25 ◽  
Author(s):  
Tina Askanius

This article examines video activism in a context where ubiquitous camera technologies and online video sharing platforms are radically changing the media landscape in which demonstrations and political activism operates. The author discusses a number of YouTube videos documenting and narrating the recurring, anti-capitalist demonstrations in Europe in the past decade. With the death of Ian Tomlinson in London during the 2009 G20 protests as an empirical starting point, the author raises questions of how video documentation of this event links up with previous protest events by juxtaposing representations of ‘the moment of death’ (Zelizer, 2004, 2010) of protesters in the past. This article suggests that these videos work as (1) an archive of action and activist memory, (2) a site of commemoration in a online shrine for grieving, and (3) a space to provide and negotiate visual evidence of police violence and state repression. The author offers a re-articulation of the longstanding debate on visual evidence, action, and testimony in video activism. The results are suggestive of how vernacular commemorative genres of mourning and paying tribute to victims of police violence are fused with the online practices of bearing witness and producing visual evidence in new creative modes of using video for change.


Author(s):  
Sharon E. Snyder ◽  
Varun Kulkarni ◽  
Paul E. Sojka

While there is no single analytical model that accurately predicts all stages and modes of secondary atomization, many groups have developed models that predict deformation and oscillation of a single, isolated drop. The TAB (Taylor Analogy Breakup) model was chosen for this investigation, mainly due to its widespread use by Liu and Reitz [1], Hwang et al. [2], Tanner [3], and Lee and Reitz [4], among others. Since the TAB model is also the foundation for many other analytical models, it will also be used here as a starting point for the development of a viscoelastic non-Newtonian model to predict droplet deformed radii, droplet deformation time, and velocity at deformation time for viscoelastic xanthan gum - DI water solutions. Three additional improvements are made to this viscoelastic TAB model: the first is a change to a TAB coefficient; the second to the equation for the drag coefficient, and the third modification is to the breakup criterion. This model uses Carreau rheology and Zimm relaxation time. Non-dimensional drop diameter and initiation times are plotted against We; model results are compared to experimental results for a range of xanthan gum solution concentrations. Results show fair agreement between experimental results and model results for non-dimensional drop diameter, with the best match at low XG concentration and low-to-medium We (10–30). It was also noted that increased viscoelasticity seems to increase this drop diameter. Good agreement between experimental data and model results has been seen for initiation time, with increased viscoelasticity increasing this parameter as well.


2017 ◽  
Vol 51 (22) ◽  
pp. 1583-1591 ◽  
Author(s):  
Nick van der Horst ◽  
FJG Backx ◽  
Edwin A Goedhart ◽  
Bionka MA Huisstede

There are three major questions about return to play (RTP) after hamstring injuries: How should RTP be defined? Which medical criteria should support the RTP decision? And who should make the RTP decision? The study aimed to provide a clear RTP definition and medical criteria for RTP and to clarify RTP consultation and responsibilities after hamstring injury. The study used the Delphi procedure. The results of a systematic review were used as a starting point for the Delphi procedure. Fifty-eight experts in the field of hamstring injury management selected by 28 FIFA Medical Centres of Excellence worldwide participated. Each Delphi round consisted of a questionnaire, an analysis and an anonymised feedback report. After four Delphi rounds, with more than 83% response for each round, consensus was achieved that RTP should be defined as ‘the moment a player has received criteria-based medical clearance and is mentally ready for full availability for match selection and/or full training’. The experts reached consensus on the following criteria to support the RTP decision: medical staff clearance, absence of pain on palpation, absence of pain during strength and flexibility testing, absence of pain during/after functional testing, similar hamstring flexibility, performance on field testing, and psychological readiness. It was also agreed that RTP decisions should be based on shared decision-making, primarily via consultation with the athlete, sports physician, physiotherapist, fitness trainer and team coach. The consensus regarding aspects of RTP should provide clarity and facilitate the assessment of when RTP is appropriate after hamstring injury, so as to avoid or reduce the risk of injury recurrence because of a premature RTP.


Author(s):  
Anja Winkler ◽  
Uwe Marschner ◽  
Eric Starke ◽  
Niels Modler ◽  
Wolf-Joachim Fischer ◽  
...  

This paper describes new active composite structures based on thermoplastic matrices which contain material homogeneous embedded piezoceramic modules. Starting point is the development of novel thermoplastic compatible piezoceramic modules, so called TPMs. By the utilization of the same matrix material for the composite structure and for the TPM carrier films, these modules afford an opportunity to become directly embedded into the component during its manufacturing process. In this context, the manufacturing technology of the TPMs and of the active composite structure is presented. Furthermore, selected test samples are investigated concerning their modal behavior. Based on the determined characteristics a linear two-port model is used for the reproduction of the experimental results.


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