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1 – 10 of 21Naveenkumar R., Shanmugam S. and Veerappan AR
The purpose of this paper is to understand the effect of basin water depth towards the cumulative distillate yield of the traditional and developed single basin double slope solar…
Abstract
Purpose
The purpose of this paper is to understand the effect of basin water depth towards the cumulative distillate yield of the traditional and developed single basin double slope solar still (DSSS).
Design/methodology/approach
Modified single basin DSSS integrated with solar operated vacuum fan and external water cooled condenser was fabricated using aluminium material. During sunny season, experimental investigations have been performed in both conventional and modified DSSS at a basin water depth of 3, 6, 9 and 12 cm. Production rate and cumulative distillate yield obtained in traditional and developed DSSS at different water depths were compared and best water depth to attain the maximum productivity and cumulative distillate yield was found out.
Findings
Results indicated that both traditional and modified double SS produced maximum yield at the minimum water depth of 3 cm. Cumulative distillate yield of the developed SS was 16.39%, 18.86%, 15.22% and 17.07% higher than traditional at water depths of 3, 6, 9 and 12 cm, respectively. Cumulative distillate yield of the developed SS at 3 cm water depth was 73.17% higher than that of the traditional SS at 12 cm depth.
Originality/value
Performance evaluation of DSSS at various water depths by integrating the combined solar operated Vacuum fan and external Condenser.
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Zhe Du, Changjie Chen and Xinhou Wang
Stab-resistant body armor (SRBA) is used to protect the body from sharp knives. However, most SRBA materials currently have the disadvantages of large weight and thickness. This…
Abstract
Purpose
Stab-resistant body armor (SRBA) is used to protect the body from sharp knives. However, most SRBA materials currently have the disadvantages of large weight and thickness. This paper aims to prepare lightweight and high-performance SRBA by 3D printing truss structure and resin-filling method.
Design/methodology/approach
The stab resistance truss structure was prepared by the fused deposition modeling method, and the composite structure was formed after filling with resin for dynamic and quasi-static stab tests. The optimized structural plate can meet the standard GA68-2019. Digital image correlation technology was used to analyze the local strain changes during puncture. The puncture failure mode was summarized by the final failure morphologies. The explicit dynamics module in ANSYS Workbench was used to analyze the design of the overlapped structure stab resistance process in this paper.
Findings
The stab resistance performance of the 3D-printed structural plate is affected by the internal filling pattern. The stab resistance performance of 3D-printed structural parts was significantly improved after resin filling. The 50%-diamond-PLA-epoxy, with a thickness of only 5 mm was able to meet the stab resistance standard. Resins are used to increase the strength and hardness of the material but also to increase crack propagation and reduce the toughness of the material. The overlapping semicircular structure was inspired by the exoskeleton structure of the demon iron beetle, which improved the stab resistance between gaps. The truss structure can effectively disperse stress for toughening. The filled resin was reinforced by absorbing impact energy.
Originality/value
The 3D-printed resin-filled truss structure can be used to prepare high-performance stab resistance structural plates, which balance the toughness and strength of the overall structure and ultimately reduce the thickness and weight of the SRBA.
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CHINA: ‘Two Sessions’ are unlikely to ease concerns
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DOI: 10.1108/OXAN-ES285667
ISSN: 2633-304X
Keywords
Geographic
Topical
John C. Pruit, Carol Rambo and Amanda G. Pruit
This performance autoethnography may or may not be interpreted as a continuation of a conversation regarding the experiences of those with devalued statuses in academic settings…
Abstract
This performance autoethnography may or may not be interpreted as a continuation of a conversation regarding the experiences of those with devalued statuses in academic settings. The authors rely on “strange accounting” to consider their experiences in the academy from various standpoints: before and after promotion, before and after leaving academia. While reflecting on our past experiences, we introduce the concept of “everyday precariousness” as a way of explaining the normalization of instability, insecurity, and negative affect that is part of everyday life for those with devalued statuses in academic settings and beyond. Everyday precariousness is an embodied experience for those in vulnerable positions. Normalized exposure to risks, such as discrimination, harassment, bullying, or structural instability, produces an undercurrent of threat that permeates academic culture. Our stories of everyday precariousness span race, ethnicity, class, academic roles, and gender boundaries (among many others). Analyzing these experiences furthers previous work on the uses of strange accounting as well as the dynamics of status silencing. In the final analysis, unresisted and unabated, everyday precariousness and status silencing can lead to institutional failure and resonance disasters.
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The EU has committed billions of euros to help Turkey deal with the impact of those refugees, but EU auditors said on April 24 that they could not determine the impact of that…
Details
DOI: 10.1108/OXAN-DB286743
ISSN: 2633-304X
Keywords
Geographic
Topical
Under pressure on cost-of-living issues, Canberra is reviewing competition laws to see what effect market dominance may be having in a handful of major sectors, including banking…
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DOI: 10.1108/OXAN-DB286078
ISSN: 2633-304X
Keywords
Geographic
Topical
It took policymakers decades to tackle the consequences of the market crash, partly due to conservative caution; this experience has encouraged other states to be more…
Ting Li, Junmiao Wu, Junhai Wang, Yunwu Yu, Xinran Li, Xiaoyi Wei and Lixiu Zhang
The purpose of this article is to prepare graphene/polyimide composite materials for use as bearing cage materials, improving the friction and wear performance of bearing cages.
Abstract
Purpose
The purpose of this article is to prepare graphene/polyimide composite materials for use as bearing cage materials, improving the friction and wear performance of bearing cages.
Design/methodology/approach
The oil absorption and discharge tests were conducted to evaluate the oil content properties of the materials, while the mechanical properties were analyzed through cross-sectional morphology examination. Investigation into the tribological behavior and wear mechanisms encompassed characterization and analysis of wear trace morphology in PPI-based materials. Consequently, the influence of varied graphene nanoplatelets (GN) concentrations on the oil content, mechanical and tribological properties of PPI-based materials was elucidated.
Findings
The composites exhibit excellent oil-containing properties due to the increased porosity of PPI-GN composites. The robust formation of covalent bonds between GN and PPI amplifies the adhesive potency of the PPI-GN composites, thereby inducing a substantial enhancement in impact strength. Notably, the PPI-GN composites showed enhanced lubrication properties compared to PPI, which was particularly evident at a GN content of 0.5 Wt.%, as evidenced by the minimization of the average coefficient of friction and the width of the abrasion marks.
Practical implications
This paper includes implications for elucidating the wear mechanism of the polyimide composites under frictional wear conditions and then to guide the optimization of oil content and tribological properties of polyimide bearing cage materials.
Originality/value
In this paper, homogeneously dispersed PPI-GN composites were effectively synthesized by introducing GN into a polyimide matrix through in situ polymerization, and the lubrication mechanism of the PPI composites was compared with that of the PPI-GN composites to illustrate the composites’ superiority.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-12-2023-0415
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Jill Flint-Taylor and Alexander Davda
The study’s aim was to design and test a leadership development approach using blended learning, to equip leaders for strengthening their own resilience and that of their teams.
Abstract
Purpose
The study’s aim was to design and test a leadership development approach using blended learning, to equip leaders for strengthening their own resilience and that of their teams.
Design/methodology/approach
A contextualised leadership development intervention was produced and evaluated following the principles of design-based research. Participants were from three organisations that work internationally to address the impact of economic disadvantage. Initial research used the behavioural event interview technique. Online assessment incorporated measures of situational judgement, emotion recognition and attributional style. Validity measures were multi-rater feedback (criterion), and NEO-PI 3 (construct). Individual feedback and a simulation-based peer workshop were followed by a four-to-six month period of experience-driven development and a final peer workshop for consolidating and evaluating learning outcomes.
Findings
The online assessment was a valid measure of leaders’ personal resilience resources and their resilience-building capability. Overall, the intervention improved participants’ understanding of, and engagement with, the processes of strengthening individual and collective (team) resilience.
Research limitations/implications
The target sample size for the study was relatively small, to ensure it would be practical to replicate the approach when designing similar interventions for a senior leadership population in other contexts. Significant results provided robust evidence for the validity of the assessment approach. Findings for the workshops and experience-driven development phase were more tentative, but the value of the design iterations was clearly demonstrated.
Practical implications
The leadership development approach is suitable for application in other organisations, if similar principles are followed to produce and evaluate materials relevant to each broad sector context. Roll-out is cost-effective, with relatively few hours of blended or virtual delivery supporting experience-driven learning.
Social implications
The impact leaders have on the wellbeing of those who report to them is well established, but less has been done to develop and formally evaluate practical, cost-effective interventions to improve this impact. The approach validated in this study can be applied more widely to benefit employee wellbeing as well as performance.
Originality/value
The study developed and evaluated a new approach to preparing leaders for the challenge of building team resilience, an aspect of leadership capability that has been given relatively little attention to date.
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