David Geiger, Fredrik Mattsson, Dongkai Shangguan, MT Ong, Patrick Wong, Mei Wang, Todd Castello and Sammy Yi
0201 assembly plays a very important role in the continuing miniaturization of electronics products. After a systematic study using Sn‐Pb solder paste on pad design, machine…
Abstract
0201 assembly plays a very important role in the continuing miniaturization of electronics products. After a systematic study using Sn‐Pb solder paste on pad design, machine evaluation, component qualification, and process optimisation, this study focused on the PCB assembly process for 0201 packages using Sn‐Ag‐Cu solder paste. The post‐reflow solder defects for a range of different spacings were examined for the different solder pastes.
Details
Keywords
Jennifer Nguyen, David Geiger, Dan Rooney and Dongkai Shangguan
The purpose of this paper is to consider PTH solder joint reliability, particularly on the PTH solder joints with partial hole‐fill and without pin protrusion. Also, the impact of…
Abstract
Purpose
The purpose of this paper is to consider PTH solder joint reliability, particularly on the PTH solder joints with partial hole‐fill and without pin protrusion. Also, the impact of voiding on the solder joint reliability is discussed.
Design/methodology/approach
Thermal cycling tests for samples of different hole‐fill percentages and voiding were conducted, and cross‐sections of the PTH solder joints were performed to evaluate the solder microstructure, intermetallic formation, via hole‐fill, and the condition of the PTH metallization and PCB dielectric prior to thermal cycling and at different times during thermal cycling.
Findings
Different failure mechanisms were observed for solder joints with and without pin protrusion. PTH components with pin protrusion had better through hole‐fill and less voids than PTH components without pin protrusion.
Originality/value
The paper discusses in detail the effect of hole‐fill percentage and voiding on PTH solder joint reliability.
Details
Keywords
Minna Arra, David Geiger, Dongkai Shangguan and Jonas Sjöberg
The surface mount technology (SMT) assembly process for 0.4 mm pitch chip scale package (CSP) components was studied in this work. For the screen printing process, the printing…
Abstract
The surface mount technology (SMT) assembly process for 0.4 mm pitch chip scale package (CSP) components was studied in this work. For the screen printing process, the printing performance of different solder pastes, aperture shapes and sizes was investigated. Square apertures and a fine particle size in the solder paste provided a better paste release. Besides optimising the printing process capability and minimizing the printing defects such as bridging and missing paste, the total volume of solder consisting of the paste and the solder ball has to be considered in order to maximize the final process yield. For the pick & place process, the accuracy required for the placement equipment was determined by studying the self‐alignment of the lead‐free CSPs (with Sn/4.0Ag/0.5Cu balls) during the reflow process using lead‐free Sn/3.9Ag/0.6Cu paste. The components were intentionally misplaced up to ∼50percent off‐pad. After reflow, x‐ray inspection showed that the components had aligned to the pad. By considering the stack‐up of the printed circuit board pad location and size tolerances, the solder paste printing tolerances and the placement tolerances, the required alignment accuracy for the pick & place equipment was established to meet the total process capability requirement.
Details
Keywords
David Geiger and Dongkai Shangguan
Provide information on the effects of flux residues from surface mount assembly on radio frequency (RF) performance.
Abstract
Purpose
Provide information on the effects of flux residues from surface mount assembly on radio frequency (RF) performance.
Design/methodology/approach
A series of test vehicles designed to evaluate the RF performance on various test patterns and some simple circuits. Empirical testing is used in determining the data.
Findings
Provides a methodology for checking the performance of flux residues as well as information on the performance of a few different flux residue types.
Research limitations/implications
This is not an all encompassing project and the results may not extrapolate out to higher frequency ranges.
Practical implications
A good source of reference that can be used to understand the impacts of the assembly process on RF performance.
Originality/value
This paper shows the effect of assembly materials (flux residues) on a real circuit and not just test patterns. It can give a basic understanding to process engineers of the potential impact of the assembly process on a RF circuit.
Details
Keywords
Rosa Caiazza, David Audretsch, Tiziana Volpe and Julie Debra Singer
Existing work documents the role that institutional setting plays in the process of spin-off creation. However, despite decades of studies, scholars have not clearly explained why…
Abstract
Purpose
Existing work documents the role that institutional setting plays in the process of spin-off creation. However, despite decades of studies, scholars have not clearly explained why some regions are more involved in spin-off activity than others. Drawing from institutional theory, the purpose of this paper is to compare different institutional settings identifying factors affecting the general environment capability to support spin-off activity of a specific region.
Design/methodology/approach
The authors utilize a cross-national analysis of American, Asian, and European areas identifying factors affecting their different rate of spin-off activity. This study contributes to the policy debate concerning entrepreneurship and how best to spur spin-off activities.
Findings
In this paper, the authors identify the general and specific factors that explain the cross-national diversity in spin-off creation. The authors then perform an analysis of the impact of these factors in various regions of the USA, Asia, and Europe, providing evidence for the necessity of specific combinations of these factors.
Originality/value
The paper offers a new perspective on the causes of spin-offs through a cross-national analysis of many areas around the world.
Details
Keywords
Frank Fernandez and David P. Baker
During the 20th century, the United States rapidly developed its research capacity by fostering a broad base of institutions of higher education led by a small core of highly…
Abstract
Purpose
During the 20th century, the United States rapidly developed its research capacity by fostering a broad base of institutions of higher education led by a small core of highly productive research universities. By the latter half of the century, scientists in a greatly expanded number of universities across the United States published the largest annual number of scholarly publications in STEM+ fields from one nation. This expansion was not a product of some science and higher education centralized plan, rather it flowed from the rise of mass tertiary education in this nation. Despite this unprecedented productivity, some scholars suggested that universities would cease to lead American scientific research. This chapter investigates the ways that the United States’ system of higher education underpinned American science into the 21st century.
Design
The authors present a historical and sociological case study of the development of the United States’ system of higher education and its associated research capacity. The historical and sociological context informs our analysis of data from the SPHERE team dataset, which was compiled from the Thomson Reuters’ Science Citation Index Expanded (SCIE) database.
Findings
We argue that American research capacity is a function of the United States’ broad base of thousands of public and broadly accessible institutions of higher education plus its smaller, elite sector of “super” research universities; and that the former serve to culturally support the later. Unlike previous research, we find that American higher education is not decreasing its contributions to the nation’s production of STEM+ scholarship.
Originality/Value
The chapter provides empirical analyses, which support previous sociological theory about mass higher education and super research universities.
Details
Keywords
Ingmar Geiger and David Naacke
Research on customer-perceived relationship value (CPRV) in business-to-business (B2B) markets has flourished over the past two decades. This paper aims to meta-analytically take…
Abstract
Purpose
Research on customer-perceived relationship value (CPRV) in business-to-business (B2B) markets has flourished over the past two decades. This paper aims to meta-analytically take stock of this research stream. It creates a comprehensive overview of the theoretical bases of CPRV research and establishes CPRV in its nomological network. The latter includes relationship benefits and sacrifices, offer quality, trust, switching costs, satisfaction, commitment, loyalty and salience of alternatives. Meaningful boundary conditions of the links to and from CPRV emerge from this research.
Design/methodology/approach
To locate suitable primary studies for inclusion in this meta-analysis, a comprehensive literature search was performed. Selection criteria ensured that only suitable B2B samples were included. Meta-analytical random and mixed-effects models were performed on a sample of k = 83 independent data sets from 94 primary publications, with a total n = 22,305.
Findings
All constructs are strongly related to CPRV in the expected direction, except for switching costs and salience of alternatives with a moderate relationship and relationship sacrifices with a non-significant mean association. Firm type (manufacturing, non-manufacturing), key informant role (purchaser, non-purchaser), supplier offering type (goods, services) and measurement approach (reflective, formative) function as boundary conditions in the moderation analysis.
Originality/value
This study is one of the very rare meta-analyses that draws exclusively from B2B marketing primary studies. It summarizes and solidifies the current theoretical and empirical knowledge on CPRV in business markets. The novel inclusion of boundary conditions offers additional insight over primary studies and makes for interesting new research directions.
Details
Keywords
Alexandra L. Ferrentino, Meghan L. Maliga, Richard A. Bernardi and Susan M. Bosco
This research provides accounting-ethics authors and administrators with a benchmark for accounting-ethics research. While Bernardi and Bean (2010) considered publications in…
Abstract
This research provides accounting-ethics authors and administrators with a benchmark for accounting-ethics research. While Bernardi and Bean (2010) considered publications in business-ethics and accounting’s top-40 journals this study considers research in eight accounting-ethics and public-interest journals, as well as, 34 business-ethics journals. We analyzed the contents of our 42 journals for the 25-year period between 1991 through 2015. This research documents the continued growth (Bernardi & Bean, 2007) of accounting-ethics research in both accounting-ethics and business-ethics journals. We provide data on the top-10 ethics authors in each doctoral year group, the top-50 ethics authors over the most recent 10, 20, and 25 years, and a distribution among ethics scholars for these periods. For the 25-year timeframe, our data indicate that only 665 (274) of the 5,125 accounting PhDs/DBAs (13.0% and 5.4% respectively) in Canada and the United States had authored or co-authored one (more than one) ethics article.
Details
Keywords
Mingang K. Geiger and Lily Morse
In this chapter, we seek to bring greater attention to language-based stigma at work and how it affects employees speaking English as their second language. We integrate research…
Abstract
In this chapter, we seek to bring greater attention to language-based stigma at work and how it affects employees speaking English as their second language. We integrate research findings across multiple disciplines, including management, psychology, linguistics, education, and business ethics, identifying three major themes and knowledge gaps in this research domain. Based on the multidisciplinary knowledge integration, we suggest six promising future directions for organizational and business ethics scholars to pursue. We call for more empirical research focusing on how language-based stigma may harm nonnative English speakers (NNESs) with and without actual mistreatment or discrimination at work and how organizations may intervene to support NNESs. We hope our chapter will spark conducive conversations about mitigating language-based stigma in the workplace.
Details
Keywords
Matthew Strickett, David C. Hay and David Lau
The purpose of this study is to examine the relationship between going-concern (GC) opinions issued by the Big 4 audit firms and adverse credit ratings from the two largest credit…
Abstract
Purpose
The purpose of this study is to examine the relationship between going-concern (GC) opinions issued by the Big 4 audit firms and adverse credit ratings from the two largest credit rating agencies (CRAs) – Standard & Poor’s (S&P) and Moody’s. This question is relevant because there have been suggestions that auditors and CRAs should become more similar to each other, and because the two largest CRAs have different ownership structures that could affect their ratings.
Design/methodology/approach
Univariate and multivariate analyses are performed using a sample of firms that filed for bankruptcy between January 1, 2002 and December 31, 2013 that also had an audit opinion signed during the 12 months prior to bankruptcy, along with a credit rating issued by either or both S&P and Moody’s. Both influence each other. The likelihood of an auditor issuing a GC opinion is related to the credit rating issued by both S&P and Moody’s in the month prior to the audit report signing. The results also show differences between the CRAs. S&P reacted in the month after an auditor issued a GC opinion by downgrading its ratings 68% of the time. However, Moody’s did not react as strongly as S&P, downgrading its ratings only 24% of the time.
Findings
Both audit reports and credit ratings influence each other. The likelihood of an auditor issuing a GC opinion is related to the credit rating issued by both S&P and Moody’s in the month prior to the audit report signing. The results also show differences between the CRAs. S&P reacted in the month after an auditor issued a GC opinion by downgrading its ratings 68% of the time. However, Moody’s did not react as strongly as S&P, downgrading its ratings only 24% of the time.
Originality/value
Auditors are more likely to issue GC opinions when there is a downgrade to the credit rating, and CRAs are more likely to downgrade their ratings when there is a GC opinion. The study highlights that CRAs with different ownership structures provide different credit rating outcomes.