W.D. MURPHY, W.F. HALL, C.D. MALDONADO and S.A. LOUIE
The control of lateral redistribution of dopants, which is critical in VLSI geometries, can be greatly facilitated by fast and accurate simulation of the key steps in the…
Abstract
The control of lateral redistribution of dopants, which is critical in VLSI geometries, can be greatly facilitated by fast and accurate simulation of the key steps in the fabrication process. To provide the basic tools for such simulation, a computer code has been developed that models nonlinear dopant redistribution within a silicon substrate whose surface may be simultaneously undergoing nonuniform oxidation. This code, MEMBRE (for Multidimensional Efficient Moving Boundary Redistribution) solves typical dopant drive‐in problems in seconds on the Cyber 176, IBM 3033, or CRAY‐1, by the use of efficient numerical techniques. Multistep fabrication schedules involving field oxide growth and high‐dose implantation and redistribution can be modeled in a few minutes execution time.
Dinesh Kumar, Veena Verma, Keya Dharamvir and H S Bhatti
– The purpose of this paper is to study elastic properties of III-V nitride nanotubes (NNTs) using second generation (REBO) potential.
Abstract
Purpose
The purpose of this paper is to study elastic properties of III-V nitride nanotubes (NNTs) using second generation (REBO) potential.
Design/methodology/approach
In the present research paper elastic properties of BN, AlN and GaN nanotubes have been investigated, using the second generation REBO potential by Brenner and co-workers, which is a bond order potential earlier used for carbon nanostructures successfully. In the present calculation, the same form of potential is used with adjusted parameters for h-BN, h-AlN and h-GaN. In all these cases the authors have considered graphite like network and strongly polar nature of these atoms so electrostatic forces are expected to play an important role in determining elastic properties of these nanotubes. The authors generate the coordinates of nanotubes of different chirality’s and size. Each and every structure thus generated is allowed to relax till the authors obtain minima of energy. The authors then apply the requisite compressions, elongations and twists to the structures and compute the elastic moduli. Young’s Modulus, Shear Modulus and Poisson’s ratio for single-walled armchair and zigzag tubes of different chirality’s and size have been calculated. The computational results show the variation of Young’s Modulus, Poisson’s ratio and Shear Modulus for these NNTs with nanotube diameter. The results have been compared with available data, experimental as well as theoretical.
Findings
The authors have calculated bond length, cohesive energy/bond, Strain energy, Young’s Modulus, Shear Modulus and Poisson’s ratio.
Originality/value
To the best of the knowledge this work is the first attempt to study elastic properties of III-V NNTs using second generation REBO potential
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Jorge Arteaga-Fonseca, Yi (Elaine) Zhang and Per Bylund
In this paper, the authors suggest that Central Americans can use entrepreneurship to solve economic uncertainty in their home country and that entrepreneurship can contribute to…
Abstract
Purpose
In this paper, the authors suggest that Central Americans can use entrepreneurship to solve economic uncertainty in their home country and that entrepreneurship can contribute to reducing the number of undocumented migrants to the USA.
Design/methodology/approach
The authors first illustrate the context of Central American illegal migration to the USA from a transitional entrepreneurship perspective, the authors address the economic drivers of illegal migration from Central America, which results in marginalization in the USA. Second, the authors build a theoretical model that suggests that Central Americans can improve their entrepreneurial abilities through the entrepreneurial cognitive adjustment mechanism.
Findings
Central Americans at risk of illegally migrating to the USA have high entrepreneurial aptitudes. Entrepreneurship can help them avoid the economic uncertainty that drives Central Americans to illegally migrate to the USA and become part of a marginalized community of undocumented immigrants. This conceptual paper introduces an entrepreneurial cognitive adjustment mechanism as a tool for Central Americans to reshape their personalities and increase their entrepreneurial abilities in their home countries. In particular, entrepreneurial intentions reshape the personality characteristics of individuals (in terms of high agreeableness and openness to experiences, as well as low neuroticism) through the entrepreneurial cognitive adjustment mechanism, which consists of reflective action in sensemaking, cognitive frameworks in pattern recognition and coping in positive affect.
Originality/value
This paper studies Central Americans at risk of illegal migration using the lens of transitional entrepreneurship, which advances the understanding of the antecedents to marginalized immigrant communities in the USA and suggests a possible solution for this phenomenon. Besides, the authors build a cognitive mechanism to facilitate the transitional process starting from entrepreneurial intention to reshaping individuals' personality, which further opens individuals' minds to entrepreneurial opportunities. Since entrepreneurial intention applies the same way to all entrepreneurs, the authors' aim of constructing the entrepreneurial intention unfolding process will go beyond transitional entrepreneurship and contribute to intention-action knowledge generation (Donaldson et al., 2021). Moreover, the conceptual study contributes to public policy such that international and local agencies can better utilize resources and implement long-term solutions to the drivers of illegal migration from Central America to the USA.
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The purpose of this paper is to investigate how different measures of working conditions affect the health at work of female and male workers of 15 European countries. Particular…
Abstract
Purpose
The purpose of this paper is to investigate how different measures of working conditions affect the health at work of female and male workers of 15 European countries. Particular attention is paid to the gender dimension of this relationship.
Design/methodology/approach
Using the European Working Conditions Survey from 2005 the author describes differences in health at work by gender accounting for both psychosocial and physical hazards at work. A Probit OLS estimator is used to obtain the relevant estimates and endogeneity problems have been properly addressed.
Findings
Results show that controlling for a broad selection of personal and work attributes, working conditions are associated with more work related health problems – both physical and mental. Importantly, some evidence is found in support of a different pattern by gender. With respect to mental health at work, males suffer more from high work demands/low job autonomy compared to females. Task segregation may play a role in explaining these differences. A less clear pattern across gender is found with respect to physical health problems at work. When the endogeneity of working conditions is taken into account, results are confirmed and show that the effect of working conditions on health at work is under‐estimated when endogeneity is not accounted for.
Originality/value
The paper's findings contribute to shed more light on the controversial analysis between working conditions and health according to gender.
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Srinu Budumuru and Satya Anuradha Mosa
Fiber-reinforced polymers (FRP) contain critical electrical conductivity for high-intensity radiated fields such as lightning strike susceptibility, electromagnetic energy from…
Abstract
Purpose
Fiber-reinforced polymers (FRP) contain critical electrical conductivity for high-intensity radiated fields such as lightning strike susceptibility, electromagnetic energy from radar, airborne radio frequency transmitter. To provide high-intensity radiated field protection (HIRFP) for the electric and electronic aircraft system and defied the EMI effect on it, metal matrix composite was conquered. To provide the dynamic ever-increasing requirement of industries, it is necessary that Al6061 metal matrix composite assisted with AL2O3 and fly ash is used to construct the aircraft to provide HIRFP. The thickness of the material can be maintained as low as possible to use it as a coating material for the aircraft surface. X-band for oblique incidence is used to measure electromagnetic and mechanical safeguarding properties of composites.
Design/methodology/approach
Day by day, the applications of aerospace are becoming digital and automated. Proper shielding techniques are required to operate digital electronic devices without electromagnetic interference. It leads to a rapid rise in temperature, thermal ablation, delamination, and adverse effects on the electric and electronic aircraft system. Fly ash, a metal matrix material composite AL6061 with different percentages of reinforcement of Al2O3, was contemplated and experimented with for mechanical properties like tensile strength, density and hardness.
Findings
The obtained results compared with adjusted values and an improvement of 0.19, 0.18, 0.14 g/cm3 for density of MMC-1, MMC-2, MMC-3.31, 11 MPa for tensile strength of MMC-1, MMC-2. 24, 27, 23 BHN for hardness of MMC-1, MMC-2, MMC-3. With regard to the shielding effectiveness the results compared with adjusted values and obtained 11.36, 14.56, 19.47 dB better value than it. According to the above results, fabricated MMC’s provide superior results for a defined application like HIRFP(Surface material of aircraft).
Practical implications
It can be used to protect electronic devices under a high-intensity radiated field, mainly in aircraft design to protect from lightning effect.
Originality/value
For a better approximation of the signal toward the practical case, the oblique incidence was considered with a different combination of Al2O3 and fly ash, reinforced to pure AL6061 to get better shielding and mechanical properties.
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Marissa Katerina Mackiewicz, Patricia Slattum and Leland Waters
This paper aims to describe the development, implementation and evolution of a multi-media educational tool to improve health profession students’ knowledge and awareness of…
Abstract
Purpose
This paper aims to describe the development, implementation and evolution of a multi-media educational tool to improve health profession students’ knowledge and awareness of stigma and ageism on the treatment of older adults with substance use disorder (SUD). In addition, this paper outlines the relationship between mental health and SUD and the impact of health provider stigmatization of older adults with behavioral health needs and the relationship between SUD and mental illness.
Design/methodology/approach
A literature review was conducted and initial project outlines was developed. Ten interviews were completed with content experts. The draft video was reviewed and minor revisions were incorporated. The facilitator guide accompanying the video was developed. A draft of the facilitator guide was shared with several interprofessional university faculty and the older adults with SUD. The video was presented to groups of health professions students, and following each video viewing, discussion content was used to provide additional edits.
Findings
The educational resources created for this project are appropriate for health professions curriculums related to older adults. Interprofessional health professions students are developing a basic foundation of knowledge on SUD through their standard coursework. More compassionate vocabulary is slowly being incorporated into health provider. Knowledge related to treatments and resources to treat SUD is lacking. In addition, health professions students need more education focused on assessment and interventions for individuals suspected of problematic substance use.
Originality/value
This paper fulfills an identified need to facilitate discussion and education around SUD for health professions students.
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Presents, at some length, the story of the writer’s father, sharing the history and experiences of a generation who prospered in the Chinese laundry industry. Chronicles the…
Abstract
Presents, at some length, the story of the writer’s father, sharing the history and experiences of a generation who prospered in the Chinese laundry industry. Chronicles the introduction of the wholesale shirt laundry, presenting new innovations and ideas and branching out into new regulated businesses in other fields, showing how emerging problems were tackled and overcome. Cites that most of the information is from memory, observation, letters and manuals. Considers the development and changes in the industry from 1930 to 1970, looking also at the accompanying changes in standards of living.
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Luminita Hurbean, Louie H.M. Wong, Carol XJ Ou, Robert M. Davison and Octavian Dospinescu
The authors investigate the relationship between instant messenger (IM) use and work performance, mediated by interruptions and two key indicators of the stress associated with…
Abstract
Purpose
The authors investigate the relationship between instant messenger (IM) use and work performance, mediated by interruptions and two key indicators of the stress associated with technology use: overload and complexity.
Design/methodology/approach
The authors validate this research model using partial least squares structural equation modelling (PLS-SEM) with data collected through a survey of 416 working professionals.
Findings
The data reveal that while IM use contributes minimally to work interruptions and to a greater extent to technological complexity, these two constructs fully mediate the direct influence of IM use at work on technology overload, and meanwhile significantly and directly contribute to work performance.
Research limitations/implications
This research provides theoretical insights into the deployment of IM and its actual impacts in the workplace. To improve the generalisation of the findings, the authors call for more IM-related research in other countries, with more native theories and various methodologies in this domain.
Practical implications
The level of stress generated through IM use is moderate, considering IM is not a significant contributor to work interruptions. Thus, despite the potential negative effects of IM communication, the positive effects of using IM at work prevail. As a result, the technology can be promoted as long as employees, their managers and the organisation as a whole are well prepared. Employees can transfer skills and behaviour from the personal setting to their work environment and thus may find an intrinsic motivation to make better use of the IM technology at work.
Originality/value
The authors argue that this research model is novel for its perspective on evaluating the actual impacts of IM use at work instead of the reasons of using it. The authors conceptualise the process to explain how IM contributes to interruptions and other technostress indicators in the working context, and the impact on performance. Contrary to some prior research, the authors find that overall IM applications do not have a negative impact on work performance, and instead may enhance it.
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Service work is often differentiated from manufacturing by the interactive labor workers perform as they come into direct contact with customers. Service organizations are…
Abstract
Service work is often differentiated from manufacturing by the interactive labor workers perform as they come into direct contact with customers. Service organizations are particularly interested in regulating these interactions because they are a key opportunity for developing quality customer service, customer retention, and ultimately generation of sales revenue. An important stream of sociological literature focuses on managerial attempts to exert control over interactions through various techniques including routinization, standardization, and surveillance. Scripting is a common method of directing workers’ behavior, yet studies show that workers are extremely reluctant to administer scripts, judging them to be inappropriate to particular interactions or because they undermine their own sense of self. This paper examines a panoptic method of regulating service workers, embodied in undercover corporate agents who patrol employee’s adherence to scripts. How do workers required to recite scripts for customers respond to undercover control? What does it reveal about the nature of interactive labor? In-depth interviews with interactive workers in a range of retail contexts reveal that they mobilize their own interactional competence to challenge the effects of the panoptic, as they utilize strategies to identify and adapt to these “mystery shoppers,” all the while maintaining their cover. The paper shows the limits on control of interactive workers, as they maintain their own socialized sense of civility and preserve a limited realm of autonomy in their work.
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Judy Louie, Kamran Ahmed and Xu-Dong Ji
This paper aims to examine the voluntary disclosure practices of family and non-family listed firms and whether family firms have improved their disclosure practices following the…
Abstract
Purpose
This paper aims to examine the voluntary disclosure practices of family and non-family listed firms and whether family firms have improved their disclosure practices following the introduction of the Principles of Good Corporate Governance and Best Practice Recommendations in 2003 in Australia.
Design/methodology/approach
Voluntary disclosures are measured by constructing an index specifically for this study. Such indexes consist of corporate governance disclosure, strategic disclosure and future disclosures. They are then regressed on firm-specific variables while controlling for family and non-family firms. A total of 60 family firms and 60 non-family firms in Australia are randomly chosen from 2001 to 2006 for examining their disclosure practices.
Findings
The research findings show that family firms disclose information voluntarily to signal to the market regarding their growth potentials and abide by government regulations to improve their reputation. Despite the fact that compliance with the Principles of Good Corporate Governance and Best Practice Recommendations was not compulsory, this paper finds that the recommendation encouraged family and non-family firms to disclose more corporate governance information.
Practical implications
The findings from this research will help investors and regulators make more strategic decisions on investments and regulations respectively in family firms.
Originality/value
There has been limited empirical evidence on the disclosure practices and their determinants of family firms in Australia. The study will thus significantly contribute to the current knowledge in this regard.