J.A. Palmer, B. Jokiel, C.D. Nordquist, B.A. Kast, C.J. Atwood, E. Grant, F.J. Livingston, F. Medina and R.B. Wicker
This paper presents a novel mesoscale RF (mRF) relay that integrates advanced high resolution stereolithography (SL) and micro wire electro discharge machining (μEDM…
Abstract
Purpose
This paper presents a novel mesoscale RF (mRF) relay that integrates advanced high resolution stereolithography (SL) and micro wire electro discharge machining (μEDM) technologies. Methods and infrastructure for reliable batch assembly of electromechanical actuators and structural parts less than 5 mm3 in volume are described. Switches made using these techniques are expected to have greater power handling capability relative to current micro RF relay products.
Design/methodology/approach
The conjecture is that the integration of SL and similar rapid additive manufacturing with other mesofabrication technologies can yield innovative miniature products with novel capabilities. A series of mRF prototypes consisting of a contact mechanism and actuator with return spring were fabricated assembled, inspected, and characterized for electromechanical performance. Characterization results led to specific conclusions regarding capabilities of the mRF product, and the integrated manufacturing technique.
Findings
The microassembly apparatus and epoxy‐based fastening system led to durable prototypes within 4 h (excluding a 16‐24 h cure cycle). Relay stroke ranged from 560 to 1,650 μm indicating a relative assembly accuracy of 90 percent. Prototypes demonstrated insertion loss of 1.3 dB at 100 MHz and isolation of better than 30 dB through 300 MHz.
Research limitations/implications
Results indicated that fully functional and robust mesoscale relays are possible using integrated manufacturing with SL. However, prototypes exhibited high contact resistance and lacked assembly precision in the context of contact mechanism stroke. Opportunities exist to reduce contact resistance and switching time.
Practical implications
The research provides a practical new product application for integrated mesoscale rapid manufacturing.
Originality/value
This work represents one of the first examples of a mesoscale relay rapidly manufactured with a combination of μEDM and SL components.
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Audrina S.Y. Tan and Pawel D. Mankiewicz
Internationally, among mental health difficulties, psychosis appears most stigmatised. Yet, research on mental health education specific to psychosis, including stigma reduction…
Abstract
Purpose
Internationally, among mental health difficulties, psychosis appears most stigmatised. Yet, research on mental health education specific to psychosis, including stigma reduction strategies, is limited. This study aims to evaluate the efficacy of a brief empirically informed indirect contact-based intervention (CBI) on reducing stigma associated with psychosis in the context of a Southeast Asian society.
Design/methodology/approach
In total, 168 young adults were randomised into three groups, two intervention conditions and one active control. Stigmatisation levels were measured at pre-intervention, post-intervention and at a 30-day follow-up. Group differences in attitudes were analysed using a 3 × 3 two-way mixed-subjects ANOVA.
Findings
Results revealed that there were no significant differences in declared stigma between the three conditions. However, a significant effect of time on the improvement of attitudes was observed at post-intervention. This effect was not sustained at follow-up.
Social implications
Individual psychoeducational CBIs implemented in the context of collectivistic societies do not produce sustainable effects in the reduction of stigma. Although a transient desirable improvement in the attitudes occurs among individuals, this is subsequently counteracted by the influence of stigma existing on a systemic level. Therefore, public mental health education in collectivistic cultures should address societal mechanisms maintaining unhelpful perceptions of those with psychosis.
Originality/value
The study examined the effect of brief CBIs on the reduction of stigma associated with psychosis in a collectivistic society and demonstrated systemic limitations of individually delivered psychoeducational interventions.
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Jae‐Won Choi, Rolando Quintana and Ryan B. Wicker
The objective of this paper is to demonstrate a method for producing embedded horizontal micro‐channels using a commercial line‐scan stereolithography (SL) system. To demonstrate…
Abstract
Purpose
The objective of this paper is to demonstrate a method for producing embedded horizontal micro‐channels using a commercial line‐scan stereolithography (SL) system. To demonstrate that the method is repeatable, reproducible and capable of producing accurate horizontal micro‐channels, a statistical design of experiments was performed.
Design/methodology/approach
Demonstration of the technique was performed using a 3D Systems Viper si2TM SL system and DSM Somos® WaterShedTM resin with polytetrafluoroethylene (PTFE)‐coated wire having diameters of 31.6 and 57.2 μm. By embedding the wire and building around the insert, the down‐facing surfaces were supported during fabrication enabling accurate fabrication of embedded micro‐channel geometries. The fabrication method involved first building an open micro‐channel, interrupting the SL process and inserting the wire, and then capping over the wire with multiple layers. After fabrication, the part with the inserted micro‐wire was post‐cured to harden any uncured resin around the wire. The micro‐channel was produced by simply pulling the wire out of the part. Scanning electron microscope images were used to examine and measure the geometries of the fabricated micro‐channels, and characterization through a statistical analysis was accomplished to show that the process was capable of producing accurate horizontal micro‐channels.
Findings
The measured data showed that the micro‐wires were successfully removed from the channels, leaving high quality micro‐channels, where the mean measured diameters for each wire were 2.65 and 2.18 μm smaller than the measured wire diameters (31.6 and 57.2 μm). Based on the statistical results, it is suggested that the method described in this work can rapidly produce repeatable and reproducible circular, embedded, and accurate micro‐channels.
Research limitations/implications
The method developed in the current work was demonstrated on simple straight channels and a statistical study was used to show that the process is capable of repeatedly and reproducibly producing accurate micro‐channels with circular cross‐section; however, future studies are required to extend these procedures to more realistic and complicated geometries that may include non‐straight channel paths and non‐circular cross‐sectional geometries. The process can be used for micro‐channel fabrication with not only circular cross‐sectional geometries as shown here but potentially with a wide range of additional cross‐sectional geometries that can be fabricated into a PTFE‐coated micro‐wire.
Originality/value
This work demonstrates a process using commercial line‐scan SL and embedding a PTFE‐coated micro‐wire that is subsequently removed for producing repeatable and reproducible horizontal embedded micro‐channels of circular cross‐sectional geometries.
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Laurie Larwood, Sergei Rodkin and Dean Judson
The need to maintain up-to-date technological skills despite an aging workforce makes it imperative that organizations increasingly focus on retraining older employees. This…
Abstract
The need to maintain up-to-date technological skills despite an aging workforce makes it imperative that organizations increasingly focus on retraining older employees. This article develops an adult career model based on the acquisition of technological skills and gradual skill obsolescence. The model suggests the importance of retraining and provides practical implications to the development of retraining programs. Suggestions for future research are also offered.
Investigates the differences in protocols between arbitral tribunals and courts, with particular emphasis on US, Greek and English law. Gives examples of each country and its way…
Abstract
Investigates the differences in protocols between arbitral tribunals and courts, with particular emphasis on US, Greek and English law. Gives examples of each country and its way of using the law in specific circumstances, and shows the variations therein. Sums up that arbitration is much the better way to gok as it avoids delays and expenses, plus the vexation/frustration of normal litigation. Concludes that the US and Greek constitutions and common law tradition in England appear to allow involved parties to choose their own judge, who can thus be an arbitrator. Discusses e‐commerce and speculates on this for the future.
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Joshua J. Turner, Olena Kopystynska, Kay Bradford, Brian J. Higginbotham and David G. Schramm
High divorce rates have coincided with higher rates of remarriage. Although remarriages are more susceptible to dissolution than first-order marriages, less research has focused…
Abstract
High divorce rates have coincided with higher rates of remarriage. Although remarriages are more susceptible to dissolution than first-order marriages, less research has focused on factors that promote vulnerabilities among remarried couples. In the current study, the authors focused on whether predictors of divorce differ by the number of times someone has been married. The authors examined some of the most common reasons for divorce, as identified by parents who completed a state-mandated divorce education course (n = 8,364), while also controlling for participant sociodemographic characteristics. Participants going through their first divorce were more likely to identify growing apart and infidelity as reasons for seeking a divorce. Conversely, those going through a subsequent divorce were more likely to list problems with alcohol/drug abuse, childrearing differences, emotional/psychological/verbal mistreatment, money problems, physical violence, and arguing. Multivariate analyses indicated that sociodemographic factors were stronger predictors of divorce number than commonly listed reasons for divorce for both male and female participants. Implications for remarital and stepfamily stability and directions for future research are discussed.
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Previous quantitative research documents that college students with disabilities do not attain higher education at rates equal to their nondisabled peers. This qualitative study…
Abstract
Purpose
Previous quantitative research documents that college students with disabilities do not attain higher education at rates equal to their nondisabled peers. This qualitative study posits that socioeconomic status (SES) is a determinant of this discrepancy, and explores how SES and disability shape the college experience of New York City (NYC) students with learning disabilities (LDs), specifically.
Methodology
Research findings from semi-structured interviews with students with LDs (n = 10) at a low-SES and a high-SES colleges are presented against the backdrop of administrative data from NYC baccalaureate-granting colleges (n = 44), disability staff surveys (n = 21), and disability staff interviews (n = 9). Examined through the lens of political economy, qualitative data demonstrate the ways colleges create environments that enable or hinder student success through difference in policy implementation.
Findings
Student themes like stress, identity, and entitlement are discussed against the theoretical and empirical exploration of the intersectionality of SES and disability. Socioeconomic differences are linked to variation in students’ college choice, accessing evaluations, requesting accommodations, and receiving supplementary supports.
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Melissa Rector LaGraff and Heidi E. Stolz
Despite the important implications for families, limited research has examined how workplace environments influence parenting behavior. Situated within the Work–Home Resources…
Abstract
Despite the important implications for families, limited research has examined how workplace environments influence parenting behavior. Situated within the Work–Home Resources Model, the purpose of this study was to investigate (a) whether workplace flexibility, a contextual resource, predicts positive parenting behavior, a home outcome, and (b) whether work–family guilt mediates this relationship. A sample of working mothers with children between the ages of 1 and 18 (N = 302) completed an online survey. Linear regression analyses indicated perceived workplace flexibility predicted overall positive parenting, positive reinforcement, and warmth behaviors in working mothers, but not proactive parenting or supportiveness. Ordinary least squares (OLS) path analyses indicated work–family guilt did not mediate these relationships, but was significantly associated with workplace flexibility, indicating workplace flexibility had a significant negative effect on work–family guilt. The results of this study provide preliminary evidence that mothers’ workplace flexibility may influence positive parenting behaviors; thus, policies that promote flexible work arrangements could promote positive family outcomes and reduce feelings of guilt related to work and family life.