1,721,353 research outputs found
Martin, T G (Thomas Gregory), NX40074
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/401798Surname: MARTIN. Given Name(s) or Initials: T G (THOMAS GREGORY). Military Service Number or Last Known Location: NX40074. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 40371.221444
Item: [2016.0049.34091] "Martin, T G (Thomas Gregory), NX40074
In-situ surface wear processes of gold coated carbon nanotube MEMS electrical contacts
No full textThis thesis describes the development, and use, of an apparatus to investigate lifetime switching wear of micro electromechanical system (MEMS) switch contacts. The investigation is focused on a composite contact material that is composed of vertically aligned multiwalled carbon nanotubes (MWCNT) with a conductive gold film coating to form an Au/MWCNT composite. A testing system, termed the In-Situ Contact Evolution (ICE) apparatus, is developed to provide the first system capable of in-situ, nanometre scale measurement of the MEMS contact surface, during sustained high-speed, low force MEMS contact cycling required for lifetime MEMS switch contact testing. The apparatus includes instrumentation that detects the formation of the transient molten metal bridge (MMB) phenomenon known to cause contact wear when hot switching. The apparatus is tested during an investigation of thin-film Au contacts under both cold and hot switching conditions. Microscopic wear from individual switching cycles is detected and a new wear mechanism is observed where a microscale delamination of the Au film interrupts the formation of a MMB. The Au/MWCNT MEMS contact material is investigated switching below the arcing voltage (~12 V). The upper limit for switching is found and the failure mechanism characterised. Above circuit currents of 302 mA the Au surface film is thermally ruptured and as the contacts open the exposed carbon nanotubes become involved in circuit conduction. The circuit current causes thermal decomposition of the nanotubes observed as a series of discrete steps in contact resistance linked to the consecutive thermal failure of the outer walls of the conducting nanotube. The influence of circuit parameters (current and voltage) and contact texture on the energy of the MMB is characterised. In an important observation the energy of the MMB is found to have a linear relationship to circuit current, rather than the i2 relationship previously reported. The delamination event (DE) is also detected switching the Au/MWCNT contact. The DE and MMB are found to be mechanically distinct, with the DE characterised by ~20% increased separation force. Circuit conditions are shown to influence the MMB energy and number of DE. The lowest voltage and current show the highest occurrence of the DE and the lowest surface wear. Lifetime testing is carried out at low force (150 µN) under hot and cold switching conditions. Under cold switching conditions the contact is switched to 4 x109 (4 billion) cycles while the microscale wear caused by DEs is detected and quantified. Under hot switching conditions of 200 mW DC power the contact fails after 140 x106 cycles switching, by an excessive increase in contact resistance. The composites Au upper surface is found to have transferred to the opposing contact by a mixture of MMB and DEs. The results are used to develop an enhanced model for the prediction of Au/MWCNT contact lifetime which considers the influence of contact force, DE wear and the switching current. The model shows good correlation with both the results of this work and previous investigation
An Exploration of the Relationships Among Financial Pressure, Ethical Climate, and Unethical Pro-organizational Behavior in the Business Setting in the United States
No full text2025Unethical behavior in the workplace can have serious consequences for organizations and employees alike. This dissertation in practice seeks to better elucidate the relationship between an employee’s perception of being under pressure to meet financial performance expectations at work and unethical pro-organizational behavior, and the role an organization’s ethical climate may play in mediating any such relationship. Using a web-based quantitative survey, this study of 135 first-line managers and employees without managerial responsibilities at mid-size and large companies in the United States found no significant direct relationship between an employee’s perception of financial pressure and unethical pro-organizational behavior. However, it did reveal a positive correlation between financial pressure and an instrumental (egoistic) ethical climate type. Further, it adds to the findings of existing research by showing a positive relationship between instrumental climate types and unethical behavior and a negative relationship between rules, caring, and laws climate types and unethical behavior. Several actions leaders can take to foster a positive ethical climate in their organizations are proposed
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Variations on the Author
Get PDF“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
Get PDFWe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Introduction: So many challenges so many choices (in science education)
No full textIn this chapter we outline our thoughts regarding the rationale for this collection of works, how that thinking changed over time, and how a reader might reflect on the content of the chapters. There is an historical element to our reasoning and we have recast how we might consider issues in science education that were previously cast as dilemmas. Our aim is to assist readers of this book to see some of the issues facing science education as challenges that will likely persist and to suggest that a problem-coping approach might be best suited to how such issues are approached
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