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1 – 10 of 25Chong Leong Gan, Francis Classe and Uda Hashim
The purpose of this paper is to provide a systematic method to perform long‐term reliability assessment of gold (Au) and copper (Cu) ball bonds in fineline ball grid array…
Abstract
Purpose
The purpose of this paper is to provide a systematic method to perform long‐term reliability assessment of gold (Au) and copper (Cu) ball bonds in fineline ball grid array package. Also with the aim to study the apparent activation energies (Eaa) and its associated wearout mechanisms of both Au and Cu wire in semiconductor device packaging. This paper discusses the influence of wire type on the long‐term reliability and mechanical performance after several component reliability stress tests.
Design/methodology/approach
A fineline ball grid array (FBGA) package with Cu and Au wire bonds was assembled with green molding compound and substrate. Samples are subjected for long‐term high temperature storage bake test at elevated temperatures of 150°C, 175°C and 200°C. Long‐term reliability plots (lognormal plots) are established and Eaa of both ball bonds are determined from Arrhenius plots. Detailed failure analysis has been conducted on failed sample and HTSL failure mechanisms have been proposed.
Findings
Reliability results show Au ball bond in FBGA package is observed with higher hour‐to‐failure compared to Cu ball bonds. The Eaa value of high temperature storage life (HTSL) reliability for Au ball bond is lower than Cu ball bond. Typical HTSL failure mechanism of Au ball bond is induced by micro‐voiding and AuAl intermetallic compound (IMC) micro‐cracks while CuAl IMC micro‐cracking (induced by Cl− corrosion attack and micro‐cracking) caused wearout opens in Cu ball bond. These test results affirm the test‐to‐failure data collected is a useful method for lifetime prediction and Eaa calculation.
Practical implications
The paper reveals higher reliability performance of Cu ball bond in FBGA flash memory package which can be deployed in flash memory FBGA packaging with optimised package bill of materials.
Originality/value
The test‐to‐failure methodology is a useful technique for wearout reliability prediction and Eaa calculation.
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Chong Leong Gan, Francis Classe, Bak Lee Chan and Uda Hashim
The purpose of this paper is to provide a systematic review on technical findings and discuss the feasibility and future of gold (Au) wirebonding in microelectronics packaging. It…
Abstract
Purpose
The purpose of this paper is to provide a systematic review on technical findings and discuss the feasibility and future of gold (Au) wirebonding in microelectronics packaging. It also aims to study and compare the cost, quality and wear-out reliability performance of Au wirebonding with respect to other wire alloys such as copper (Cu) and silver (Ag) wirebonding. This paper discusses the influence of wire type on the long-term reliability tests.
Design/methodology/approach
Literature reviews are conducted based on cost and wire selections of Au, Cu or Ag wirebonding. Detailed wear-out failure findings and wire selection with cost considerations are presented in this review paper. The future and the status of Au wirebonding in microelectronics packaging are discussed in this paper.
Findings
This paper briefly reviews selected aspects of the Au ball and other alternative bonding options, focusing on reliability performance, and discusses the future of Au wirebonding in the near future in semiconductor packaging.
Practical implications
The paper reveals the technical considerations when choosing the wire types for future microelectronics packaging.
Originality/value
The in-depth technical review and strategies of the selection of wire types (Au, Cu or the latest Ag alloy) in microelectronics packaging are discussed in this paper based on previous literature studies.
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Francis Bangou and Stephanie Arnott
This chapter is the actualization of an experimentation of two second language (L2) teacher educators (the authors) with(in) Deleuze and Guattari’s (1987) ontology and the…
Abstract
This chapter is the actualization of an experimentation of two second language (L2) teacher educators (the authors) with(in) Deleuze and Guattari’s (1987) ontology and the associated concepts of agencement, desire, rhizomes, becoming, and affect to contribute to the everchanging knowledge base associated with the work and experiences of teacher educators at a time when such contributions are urgently needed. More precisely, this chapter sought to illustrate what could happen when, as teacher educators and researchers, we become “intimate” with the various elements of a research–teaching–learning–writing agencement. To do so, the chapter presents research based on material collected as part of a study on a mentoring experience between the authors. The second author was preparing to teach an online graduate course in L2 education to in-service teachers for the first time, while the first author had more experience with online teaching. Through the rhizoanalysis of three vignettes, the authors engaged with(in) their experiences by considering how various elements of the research–teaching–learning–writing agencement – particularly the most intensively affective ones – impacted and were impacted by other elements. With(in) this process, desire emerged as a praxis and a force capable of generating new knowledge in part by encouraging teachers and teacher educators (1) to experiment with learning, teaching, and conducting research with(in) the productive energy of desire, and (2) to disrupt affective powers as well as the role played by the body in such a process.
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I. The Gendarmerie: Historical Background The Gendarmerie is the senior unit of the French Armed Forces. It is, however, difficult to give a precise date to its creation. What can…
Abstract
I. The Gendarmerie: Historical Background The Gendarmerie is the senior unit of the French Armed Forces. It is, however, difficult to give a precise date to its creation. What can be asserted is that as early as the Eleventh Century special units existed under the sénéchal (seneschal), an official of the King's household who was entrusted with the administration of military justice and the command of the army. The seneschal's assistants were armed men known as sergents d'armes (sergeants at arms). In time, the office of the seneschal was replaced by that of the connétable (constable) who was originally the head groom of the King's stables, but who became the principal officer of the early French kings before rising to become commander‐in‐chief of the army in 1218. The connétable's second in command was the maréchal (marshal). Eventually, the number of marshals grew and they were empowered to administer justice among the soldiery and the camp followers in wartime, a task which fully absorbed them throughout the Hundred Years War (1337–1453). The corps of marshals was then known as the maréchaussée (marshalcy) and its members as sergeants and provosts. One of the provosts, Le Gallois de Fougières, was killed at Agincourt in 1415; his ashes were transferred to the national memorial to the Gendarmerie, which was erected at Versailles in 1946.
Fabiana Gondim Mariutti and Cleuza Gertrudes Gimenes Cesca
What are the academic experiences of senior professors in the field of public relations (PR) at the Brazilian universities? This chapter proposes the advance of knowledge on the…
Abstract
What are the academic experiences of senior professors in the field of public relations (PR) at the Brazilian universities? This chapter proposes the advance of knowledge on the theoretical framework of contemporary liberal feminism by refining the previous theoretical and methodological publications. This theoretical lens prevails in earlier works, with empirical studies grounded in industry and corporate environments – mainly done by researchers from the United Kingdom, North America and Scandinavia, while PR feminist postmodernism appears in European literature – all scarce in Brazil and Global South (Latin America and African nations). Moreover, studies applying female or male PR scholars in university settings are rare in national and international literature. Hence, we gathered data and analysed narratives from seven senior female PR professors from Brazil, using an interpretative qualitative approach. Thus, this chapter about the female PR academic experiences and everyday practices highlights the starting point for an onto-epistemological discussion to understand the liberal feminist educational-based context in a Latin American country. Henceforth, two conceptual-practical dimensions – feminist PR competence and feminist PR performance – along with three methodological recommendations are presented for enhancing the contemporary liberal feminism theme as a robust research domain in PR and Strategic Communication agenda.
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This special “Anbar Abstracts” issue of Journal of Management in Medicine is split into 6 sections covering abstracts under the following headings: General Management; Personnel…
Abstract
This special “Anbar Abstracts” issue of Journal of Management in Medicine is split into 6 sections covering abstracts under the following headings: General Management; Personnel and Training; Quality in Health Care; Health Care Marketing; Financial Management; and Information Technology.
Elmir de Almeida, Marilena Nakano, Maria Elena Villar e Villar and Vanderlei Mariano
The paper presents final results of a comparative research on young Brazilian collegians in the 18–24-year-old age bracket. The objective was to understand the interactions and…
Abstract
Purpose
The paper presents final results of a comparative research on young Brazilian collegians in the 18–24-year-old age bracket. The objective was to understand the interactions and ways in which they transit within the physical and digital Web spaces and, within their transits, set up “circulatory territories,” deepen and enrich their secondary socialization setups and sociability, as well as their processes of individuation within the historic condition in which youth lives.
Methodology/approach
The study is supported by conceptual contributions offered by the sociology of youth, circulatory territory, socialization, sociability, and individuation. Research was carried out with students of two different universities: a public/state one and a public/municipal/foundational one situated in different urban centers of the southeastern region of the country. Procedures were qualitative and quantitative – closed questions forms, interviews, registries in field notebooks, etc.
Findings
The results of the investigation demonstrate: (a) that the representatives of the two student collectives studied circulate in physical and digital territories, setting up circulatory territories; (b) there are also different youth lifestyles, either due to social positions and the fact that they possess social capital, or because of differences and inequalities referring to gender, race/ethnicity (whites and non-whites), living situations.
Originality/value
In this manner, the study indicates the importance of questioning the homogenized image of connected youth since some collegians’ lives are limited due to their condition as young workers, while others live their youth condition as a social moratorium, being able to produce other manners of being and of living in the world.
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Considers the position of women in the computing industry and theimpact of new technology on women employed in information handlingoccupations. Examines the role of traditional…
Abstract
Considers the position of women in the computing industry and the impact of new technology on women employed in information handling occupations. Examines the role of traditional attitudes to women, education and training, this is of particular importance as the computer industry faces a skill crisis in the 1990s. Trends would seem to suggest that although women have the potential to take up new opportunities in computing, they fail to see computing as an attractive option and are technically ill‐equipped to do so.
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Jaideep Motwani, Ashok Kumar, James Jiang and Mohamed Youssef
The current competitive business environment has forced business leaders to consider business process reengineering (BPR) in their search for dramatic improvement in…
Abstract
The current competitive business environment has forced business leaders to consider business process reengineering (BPR) in their search for dramatic improvement in organizational effectiveness. This paper provides an extensive review of the existing literature by classifying the articles into four research streams, presents a comprehensive practical reengineering plan for achieving a true organization transformation, and suggests future research directions for BPR under each of these streams.
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THE catalogue, as a library appliance of importance, has had more attention devoted to it than, perhaps, any other method or factor of librarianship. Its construction, materials…
Abstract
THE catalogue, as a library appliance of importance, has had more attention devoted to it than, perhaps, any other method or factor of librarianship. Its construction, materials, rules for compilation and other aspects have all been considered at great length, and in every conceivable manner, so that little remains for exposition save some points in the policy of the catalogue, and its effects on progress and methods. In the early days of the municipal library movement, when methods were somewhat crude, and hedged round with restrictions of many kinds, the catalogue, even in the primitive form it then assumed, was the only key to the book‐wealth of a library, and as such its value was duly recognized. As time went on, and the vogue of the printed catalogue was consolidated, its importance as an appliance became more and more established, and when the first Newcastle catalogue appeared and received such an unusual amount of journalistic notice, the idea of the printed catalogue as the indispensable library tool was enormously enhanced from that time till quite recently. One undoubted result of this devotion to the catalogue has been to stereotype methods to a great extent, leading in the end to stagnation, and there are places even now where every department of the library is made to revolve round the catalogue. Whether it is altogether wise to subordinate everything in library work to the cult of the catalogue has been questioned by several librarians during the past few years, and it is because there is so much to be said against this policy that the following reflections are submitted.