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Article
Publication date: 11 April 2008

John Lau, Jerry Gleason, Valeska Schroeder, Gregory Henshall, Walter Dauksher and Bob Sullivan

The High Density Packaging Users Group Consortium has conducted a study of process development and solder‐joint reliability of high‐density packages on printed circuit…

Abstract

Purpose

The High Density Packaging Users Group Consortium has conducted a study of process development and solder‐joint reliability of high‐density packages on printed circuit boards (PCB) using a low‐melting temperature lead‐free solder. The purpose of this paper is to investigate the reliability tests (e.g. temperature cycling and shock and vibration) and failure analysis (FA) of high‐density packages on PCB with the low‐melting temperature lead‐free solder (Sn‐57 wt%Bi‐1 wt%Ag).

Design/methodology/approach

The design for reliability, materials, and assembly process aspects of the project have been discussed in “Design, materials, and assembly process of high‐density packages with a low‐temperature lead‐free solder (SnBiAg)” also published in this journal issue. In this study, reliability tests (e.g. temperature cycling and shock and vibration) and FA of high‐density packages on PCB with the low‐melting temperature lead‐free solder (Sn‐57 wt%Bi‐1 wt%Ag) are investigated.

Findings

Lead‐free solder‐joint reliability of high‐density packages, such as the PBGA388, PBGA256, PBGA208, PBGA196, PBGA172, PQFP80, and TSSOP56 were determined by temperature cycling, shock, and vibration tests. Temperature cycling test data for over 8,100 cycles between 0 and 100°C in a 44 min. cycle were statistically analyzed. Shock and vibration test data based on the HP Standard Class Bi‐II Products SPEC have also been reported.

Originality/value

Currently there is a lack of experimental and simulation data and field experience in respect of one of the critical issues for industry – that of solder joint reliability in lead‐free soldering. The paper contains some important research results and recommendations.

Details

Soldering & Surface Mount Technology, vol. 20 no. 2
Type: Research Article
ISSN: 0954-0911

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Article
Publication date: 11 April 2008

John Lau, Jerry Gleason, Valeska Schroeder, Gregory Henshall, Walter Dauksher and Bob Sullivan

The purpose of this paper is to discuss the design, materials, and assembly process aspects of a study, conducted by The High Density Packaging Users Group Consortium…

Abstract

Purpose

The purpose of this paper is to discuss the design, materials, and assembly process aspects of a study, conducted by The High Density Packaging Users Group Consortium, into process development and solder joint reliability of high‐density packages on printed circuit boards using a low‐melting temperature lead‐free solder (Sn‐57 wt%Bi‐1 wt%Ag).

Design/methodology/approach

The components studied include several SMT package types and various lead configurations. The assembly process addresses the low‐temperature lead‐free assembly process, inspection and analysis of these boards and packages.

Findings

It was found that, the assembly process of the SnBiAg lead‐free test boards is very robust and the assembly yield is almost 100 percent.

Originality/value

The paper is of value by presenting a description of the rationale and material set used for an experiment to test SMT assembly and reliability characteristics using the 57Bi‐42Sn‐1Ag alloy, which has a melting point of 139°C.

Details

Soldering & Surface Mount Technology, vol. 20 no. 2
Type: Research Article
ISSN: 0954-0911

Keywords

Content available

Abstract

Details

Soldering & Surface Mount Technology, vol. 22 no. 3
Type: Research Article
ISSN: 0954-0911

Content available
Article
Publication date: 28 June 2011

Abstract

Details

Soldering & Surface Mount Technology, vol. 23 no. 3
Type: Research Article
ISSN: 0954-0911

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Article
Publication date: 1 January 1959

Under this heading published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Council, Reports and Technical Memoranda of the United States…

Abstract

Under this heading published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Council, Reports and Technical Memoranda of the United States National Advisory Committee for Aeronautics and publications of other similar Research Bodies as issued.

Details

Aircraft Engineering and Aerospace Technology, vol. 31 no. 1
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 21 June 2019

Lucy Garrod, Jane Fossey, Catherine Henshall, Sandra Williamson, Alice Coates and Helen Green

The purpose of this paper is to report on a service evaluation of a competency-based dementia training programme for clinicians to establish its value in improving their…

Abstract

Purpose

The purpose of this paper is to report on a service evaluation of a competency-based dementia training programme for clinicians to establish its value in improving their knowledge and confidence of dementia care and to explore any resulting changes to practice.

Design/methodology/approach

Mixed method quantitative and qualitative data, using rating scales and focus group discussions (FGDs), were collected. Wilcoxon signed-rank test was used to analyse changes in the responses to the rating scales of knowledge and confidence and thematic analysis of FGDs was undertaken to identify staff perceptions of the impact of training on their practice.

Findings

In total, 162 qualified and clinical support staff undertook the training. A significant change in knowledge and confidence scores was found on all three scales. In general, feedback on the course was positive. Seven themes, demonstrating the relevance of the training to practice, emerged from the FGDs – experiential training awareness of diagnosis, approach, understanding, communication, risk, changed practice and going forward.

Practical implications

Providing competency-based dementia training for large numbers of staff can have a positive effect on the care delivered to patients with dementia.

Originality/value

Healthcare organisations have a responsibility to ensure their staff have the training to provide quality care for patients living with dementia. This paper suggests this can be achieved through a collaborative, multi-disciplinary approach involving co-production and best practice guidance.

Details

The Journal of Mental Health Training, Education and Practice, vol. 14 no. 4
Type: Research Article
ISSN: 1755-6228

Keywords

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Article
Publication date: 1 October 1961

Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Council, Technical Reports and Translations of the United…

Abstract

Under this heading are published regularly abstracts of all Reports and Memoranda of the Aeronautical Research Council, Technical Reports and Translations of the United States National Aeronautics and Space Administration and publications of other similar Research Bodies as issued.

Details

Aircraft Engineering and Aerospace Technology, vol. 33 no. 10
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 September 2002

Jeremy Rose

Soft Systems Methodology (SSM) has long been involved in information systems development through the medium of action research. Its social constructivist paradigm and…

Abstract

Soft Systems Methodology (SSM) has long been involved in information systems development through the medium of action research. Its social constructivist paradigm and managerial focus distinguish it from most software engineering development approaches. Checkland’s underlying view of systems development, however, is heavily influenced by traditional waterfall models – something of a contradiction. This paper uses recent developments in SSM to develop a more appropriate systems development concept: the interaction‐transformation‐interaction (ITI) model. The model views systems development primarily as a social and managerial task, rather than a technical one. It was successfully used (in conjunction with developed forms of SSM which incorporate analysis based on structuration theory) to structure the development of an intranet in a university department. The experience led to a further series of reflections on the model.

Details

Information Technology & People, vol. 15 no. 3
Type: Research Article
ISSN: 0959-3845

Keywords

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Book part
Publication date: 14 July 2006

David Ray Griffin

I argue that the official story about the collapses of the Twin Towers and building 7 of the World Trade Center, according to which the collapses were caused by fire …

Abstract

I argue that the official story about the collapses of the Twin Towers and building 7 of the World Trade Center, according to which the collapses were caused by fire – combined, in the case of the Twin Towers, with the effects of the airplane impacts – cannot be true, for two major reasons. One reason is that fire has never, except allegedly three times on 9/11, caused the total collapse of steel-frame high-rise buildings. All (other) such collapses have been produced by the use of explosives in the procedure known as “controlled demolition.” The other major problem is that the collapses of all three buildings had at least 11 features that would be expected if, and only if, explosives had been used.

I also show the importance of the recently released of 9/11 Oral Histories recorded by the New York Fire Department. With regard to the Twin Towers, many of the firefighters and medical workers said they observed multiple explosions and other phenomena indicative of controlled demolition. With regard to building 7, many testimonies point to widespread foreknowledge that the building was going to collapse, and some of the testimonies contradict the official story that this anticipation of the building's collapse was based on objective indications. These testimonies further strengthen the already virtually conclusive case that all three buildings were brought down by explosives.

I conclude by calling on the New York Times, which got the 9/11 Oral Histories released, now to complete the task of revealing the truth about 9/11.

Details

The Hidden History of 9-11-2001
Type: Book
ISBN: 978-1-84950-408-9

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Article
Publication date: 19 June 2019

Anneli Douglas

Research abounds highlighting the differences between males and females when they travel. Even in business travel, these differences have been acknowledged, with suppliers…

Abstract

Purpose

Research abounds highlighting the differences between males and females when they travel. Even in business travel, these differences have been acknowledged, with suppliers and marketers spending significant money to develop and market products to accommodate them. The purpose of this study is to ascertain whether differences exist in terms of mobile application usage between male and female business travellers.

Design/methodology/approach

A mixed method approach is followed. An internet-based survey is distributed and in-depth interviews conducted with South African business travellers. The Mann–Whitney U-test is used to test the differences between males and females and their mobile application usage. Content analysis is used to analyse the interviews.

Findings

The results show that mobile applications are perceived as more important by females than males in all the phases of the travel cycle, although most of these differences in perceived importance were not significant.

Research limitations/implications

Owing to the online data-collection method and the self-selective process, the findings cannot be generalised to the global population of business travellers who use mobile applications.

Practical implications

The results should caution corporate organisations, travel management companies and their application developers not to spend unnecessary technological and financial resources on developing applications to accommodate differences between males and females, which might not exist. Companies should rather spend money on developing applications that will enhance and add convenience to the business traveller’s experience.

Originality/value

The main contribution of this study lies in investigating the applications market, particularly in the context of business travel. Applications focussed on specific sectors of the tourism industry, such as business travel applications, serve business travellers differently from generic travel applications. This research examines business travel-specific applications and expands the scale and scope of the enquiry, concentrating on the travellers’ view.

研究目的

本论文主要研究男人和女人在旅游中的行为区别。特别是在商务旅游中, 男女差别确实存在, 这也验证了供应商和营销商在开发营销产品中的针对性和区别性。本论文旨在验证是否男女商务旅游者对使用移动APP存在区别。

研究设计/方法/途径

本论文采用混合采样方法。采样方式通过网络问卷和深度访谈, 采样群体为南非商务游客。本论文采取Mann–Whitney U检验来测试男女在移动APP使用上的区别。本论文还采取文本分析法来分析访问数据。

研究结果

研究结果表明女性游客在各个旅游阶段都比男性游客对移动APP更看重, 而这些区别在统计计算上并没有获得显著效果。

研究理论限制/意义

由于线上采样和自助问卷的采样限制, 研究结果不能推广到全球商务旅客对于使用移动APP的态度。

研究实践意义

研究结果可以警示企业机构、旅游管理公司、以及APP开发商不要花费不必要的科技和财力资源来迎合男女受众的需求。因为这个区别可能不存在。公司应该花费财力在开发APP上, 使得商旅客人的使用体验更加便捷。

研究原创性/价值

本论文最重要的贡献就是研究了商旅APP市场。商旅APP区分于普通旅游APP。我们的研究检验了商旅客人APP以及扩展其度量和研究视野到旅游者的角度。

关键词

移动设备, 性别, 商务旅行, 商务旅行周期, 商务旅客, 移动商务旅行应用

Details

Journal of Hospitality and Tourism Technology, vol. 10 no. 3
Type: Research Article
ISSN: 1757-9880

Keywords

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