A review: metamaterial sensors for material characterization

Sensor Review ◽  
2019 ◽  
Vol 39 (3) ◽  
pp. 417-432 ◽  
Author(s):  
A. Vivek ◽  
K. Shambavi ◽  
Zachariah C. Alex

Purpose This paper aims to focus on research work related to metamaterial-based sensors for material characterization that have been developed for past ten years. A decade of research on metamaterial for sensing application has led to the advancement of compact and improved sensors. Design/methodology/approach In this study, relevant research papers on metamaterial sensors for material characterization published in reputed journals during the period 2007-2018 were reviewed, particularly focusing on shape, size and nature of materials characterized. Each sensor with its design and performance parameters have been summarized and discussed here. Findings As metamaterial structures are excited by electromagnetic wave interaction, sensing application throughout electromagnetic spectrum is possible. Recent advancement in fabrication techniques and improvement in metamaterial structures have led to the development of compact, label free and reversible sensors with high sensitivity. Originality/value The paper provides useful information on the development of metamaterial sensors for material characterization.

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 5038 ◽  
Author(s):  
Hongjun Gu ◽  
He Gong ◽  
Chunxue Wang ◽  
Xiaoqiang Sun ◽  
Xibin Wang ◽  
...  

In this paper, we present and analyze a compact inner-wall grating slot microring resonator (IG-SMRR) with the footprint of less than 13 μm × 13 μm on the silicon-on-insulator (SOI) platform for label-free sensing, which comprises a slot microring resonator (SMRR) and inner-wall grating (IG). Its detection range is significantly enhanced without the limitation of the free spectral region (FSR) owing to the combination of SMRR and IG. The IG-SMRR has an ultra-large quasi-FSR of 84.5 nm as the detection range, and enlarged factor is up to over 3 compared with the conventional SMRR. The concentration sensitivities of sodium chloride solutions and D-glucose solutions are 996.91 pm/% and 968.05 pm/%, respectively, and the corresponding refractive index (RI) sensitivities are 559.5 nm/RIU (refractive index unit) and 558.3 nm/RIU, respectively. The investigation on the combination of SMRR and IG is a valuable exploration of label-free sensing application for ultra-large detection range and ultra-high sensitivity in future.


2019 ◽  
Vol 31 (3) ◽  
pp. 207-230 ◽  
Author(s):  
Farhan Ahmad ◽  
Muhaimin Karim

PurposeKnowledge sharing contributes to the success of an organization in various ways. This paper aims to summarize the findings from past research on knowledge-sharing outcomes in organizations and to suggest promising directions for future research.Design/methodology/approachThere was a conduction of a systematic literature review that consisted of three main phases: defining a review protocol, conducting the review and reporting the review. The thematic analysis was conducted on 61 studies, based on which a framework for understanding the impacts of knowledge sharing was developed.FindingsPrevious research has investigated knowledge-sharing outcomes at three levels: the individual, team and organization; specific impacts are summarized for each level. The most commonly studied factors affected by knowledge sharing are creativity, learning and performance. Knowledge sharing is also found to have some beyond-convention work-related impacts, such as those on team climate and employees’ life satisfaction. Research on the outcomes of knowledge sharing is dominated by quantitative studies, as we found only one qualitative study in this review. Based on the discussion of the results, promising avenues for further research were identified and a research agenda was proposed. More research on differential, psychological and negative impacts, as well as interactional and methodological aspects of knowledge-sharing, is suggested.Originality/valueTo date, no systematic review has been conducted on the impacts of knowledge-sharing. This paper makes an important contribution to knowledge-sharing research, as it consolidates previous research and identifies a number of useful research topics that can be explored to advance the field, as well as to establish the evidence-based importance of knowledge sharing.


2020 ◽  
Vol 44 (5) ◽  
pp. 490-498
Author(s):  
Abdul Khader Karakka Kal ◽  
Zubair Perwad ◽  
Tajudheen K Karatt ◽  
Jahfar Nalakath ◽  
Michael Subhahar

Abstract Recently, an increased tendency to use various metals has been observed in the sports competition fields. Many of these metals and their organic complexes reportedly have good pharmacologic, therapeutic and performance-enhancement uses; they are banned or recommended as controlled medications in competitive sports. The objective of this research was to determine the concentration of pharmacologically relevant metals in urine samples collected from racehorses at various sport events, develop a method and assess the concentrations of above metals using inductively coupled plasma mass spectrometry (ICP-MS). Seven alkali–alkaline earth metals (lithium, sodium, potassium, magnesium, calcium, strontium and barium) and six heavy metals (chromium, cobalt, copper, zinc, arsenic and selenium) were studied in detail. To compare and confirm the concentrations of these metals, the screening was carried out on the basis of region and sex of the animal. ICP-MS provides extremely high sensitivity that enables the determination of the metals at very low concentration from complex biological matrices. From the research, it is clear that irrespective of sex and region the concentration of metal is very high in some samples, might be accidental or intentional doping to improve sporting performances. This research work is of significant importance in setting threshold values for screening metals in race day samples in order to avoid potential harmful effects on athletes and the depth of malpractices, it can bring to sports.


2016 ◽  
Vol 38 (4) ◽  
pp. 466-486 ◽  
Author(s):  
Jhony Choon Yeong Ng ◽  
Iris Yu Ting Shao ◽  
Yiping Liu

Purpose – Many fresh graduates have unrealistic career expectations. When reality sets in after graduation, they may be disappointed. Due to factors such as the limited availability of feasible alternative career options, employees who have to stay in jobs they dislike may feel trapped. To alleviate the resulting stresses, they may engage in avoidance coping strategies, such as non-work-related social media use, to discharge their mental strains. The purpose of this paper is to discuss how the perception of being trapped can result in the adoption of avoidance coping strategies, and how these strategies can influence individual performance and social media use. Design/methodology/approach – Based on the literature on avoidance coping strategy, goal orientation theory, and performance theory, the authors proposed a theoretical model on how the avoidance coping strategy of an individual can influence their performance and workplace behavior. Findings – The authors propose that when a fresh graduate feels “trapped” in a job, the stresses experienced may cause them to hide behind their defense mechanisms. An avoidance coping strategy may then be adopted, and this will influence the individual’s workplace behavior (in terms of non-work-related use of social media) and performance. Practical implications – If an avoidance coping strategy is an antecedent to non-work-related use of social media, then controlling the use of social media in the workplace may only cause these employees to switch to other forms of self-distraction (for instance, spending more time chatting with colleagues). Under some circumstances, the use of such control mechanisms may even give cyberloafers stronger urges to use social media for non-work-related purposes. If this is the case, managers should reconsider their current approach in handling the related behavior. Social implications – If the cause of non-work-related use of social media in the workplace is an avoidance coping strategy, then the engagement of such workplace behaviors should not be considered “intentionally harmful actions”. One important criterion for workplace behavior to qualify as a type of counterproductive behavior is that such behavior must be conducted to be intentionally harmful. Given this, the resulting actions of an avoidance coping strategy should not be considered a form of counterproductive behavior, and the authors should reconsider the conceptualization of cyberloafing provided in the organizational literature. Originality/value – The authors believe that this research represents one of the first attempts to bridge the gap between clinical and managerial literature. It attempts to explain non-work-related use of social media in the workplace from the perspective of trapped perception and avoidance coping strategy, and it argues that not all forms of non-work-related use of social media in the workplace are instances of cyberloafing.


2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Chamila Kumudunee Wijekuruppu ◽  
Alan Coetzer ◽  
Pattanee Susomrith

PurposeThe strength-based approach is promulgated as a management practice that improves individual productivity and performance. This study's purpose is to explore the prospective applicability of the strengths-based approach to managing and developing employees in small businesses. The study focuses on four domains of practice: selection, training, performance evaluation and task assignment.Design/methodology/approachThe study employed semi-structured, face-to-face interviews to obtain data. The units of analysis were managers and employees of small businesses. Eleven managers and 19 employees were interviewed. Data analysis involved thematic analysis with the NVivo 12 software program.FindingsFirst, the small businesses used a strengths-based approach for employee selection during employees' temporary status of employment and in employee task assignment. However, managers did not employ a strengths-based approach to employee selection during selection interviews, training or performance evaluations. Second, the managers perceived strengths identification as a difficult task. Based on personal observations, they perceived employees' positive character traits, job-related skills and work-related efficiency as employee strengths.Practical implicationsThis study informs managers about a potential alternative to the traditional weakness-based management practice. The findings and conceptual arguments suggest that a strengths-based approach can provide a cost-effective alternative to the resource-intensive approaches commonly employed to enhance employee productivity and performance.Originality/valueThe study provides the first empirical evidence on the prospective applicability of the strengths-based approach to small businesses and explores conceptually the suitability of the said approach to this context.


2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Richard Osadume ◽  
Anthony Ojovwo Okene

PurposeThe objective of this study is to ascertain whether financial sector sustainability had any correlation with financial sector performance in Nigeria and recommend appropriate policy directions.Design/methodology/approachThe study selected four major Nigerian banks namely Zenith Bank Guaranty Bank United Bank for Africa and First Bank of Nigeria as its sample and covered 2010 to 2019. Secondary panel data were obtained from the published financial Statements of the banks and subjected to analytical techniques of panel unit root tests descriptive statistics panel least square and Co-integration statistical techniques at the 5% level of significance.FindingsThe findings revealed that the exogenous variables (SUST) have significant Impact on the endogenous variable (ROA, ROE) in the short-run but insignificant in the long run.Research limitations/implicationsThe period covered was limited to 10 years and has an African development focus with emphasis on West Africa, Nigeria. However, the implication could be general to most or all economic and financial landscape. It shows that there is a correlation between financial sector sustainability and return on assets and returns on equity.Practical implicationsMonetary authorities should develop applicable annual performance sustainability framework for all banks; and set performance targets, that will be measured and monitored by appropriate regulatory unit periodically.Social implicationsThe financial sector survival is directly related to its contribution towards the survival and development of its host community and operating environment.Originality/valueThis approach is novel in the sense that its approach is practical and measurable, which most research work have not focused on.


2018 ◽  
Vol 12 (1) ◽  
pp. 62-76 ◽  
Author(s):  
Jacob Donkor ◽  
George Nana Agyekum Donkor ◽  
Collins Kankam Kwarteng

Purpose This paper aims to examine the interacting effect of market dynamism and strategic planning on the performance of small- and medium-scale enterprises (SMEs) in Ghana. Design/methodology/approach This study has used quantitative approach in dealing with the interacting effect of market dynamic on strategic planning and SMEs’ performance in Ghana. Purposive sampling is used to select 200 small- and medium-sized manufacturing and service firms in Ghana. The hierarchical multiple regression analysis is performed to test the hypotheses. Findings This study finds that a consistent application of strategic planning methodologies contributes to the advancement of SME performance in Ghana. In addition, it was ascertained that market dynamism has a significant positive relationship with firm performance, although its effect is not significant. Finally, the study reveals that market dynamism only influences SME performance when there is strategic planning. Research limitations/implications The findings are limited to the SMEs in Ghana. The study of market dynamism, strategic planning and performance is a very complex activity; therefore, to gather rich data on such research work may be best accomplished if the researchers adopt mixed method data gathering techniques. This will enrich the understanding on market dynamism, strategic planning and SMEs’ performance relationship. Practical implications The findings of this research work offer guidance to owners or managers considering how to develop market dynamics and strategic planning to enhance firm performance. Originality/value This study reports on an obvious gap in the prevailing literature that few empirical research works have explored on the possible impacts of market dynamism and strategic planning on performance of SMEs in a third world country.


2019 ◽  
Vol 48 (1) ◽  
pp. 204-219 ◽  
Author(s):  
Denise Salin ◽  
Renee Cowan ◽  
Oluwakemi Adewumi ◽  
Eleni Apospori ◽  
Jaime Bochantin ◽  
...  

Purpose The purpose of this paper is to analyze cross-national and cross-cultural similarities and differences in perceptions and conceptualizations of workplace bullying among human resource professionals (HRPs). Particular emphasis was given to what kind of behaviors are considered as bullying in different countries and what criteria interviewees use to decide whether a particular behavior is bullying or not. Design/methodology/approach HRPs in 13 different countries/regions (n=199), spanning all continents and all GLOBE cultural clusters (House et al., 2004), were interviewed and a qualitative content analysis was carried out. Findings Whereas interviewees across the different countries largely saw personal harassment and physical intimidation as bullying, work-related negative acts and social exclusion were construed very differently in the different countries. Repetition, negative effects on the target, intention to harm, and lack of a business case were decision criteria typically used by interviewees across the globe – other criteria varied by country. Practical implications The results help HRPs working in multinational organizations understand different perceptions of negative acts. Originality/value The findings point to the importance of cultural factors, such as power distance and performance orientation, and other contextual factors, such as economy and legislation for understanding varying conceptualizations of bullying.


Author(s):  
Hongjun Gu ◽  
He Gong ◽  
Chunxue Wang ◽  
Xiaoqiang Sun ◽  
Xinbin Wang ◽  
...  

In this paper, we present and analyze a compact inner-wall grating slot microring resonator (IG-SMRR) with the footprint of less than 13 μm × 13 μm on the SOI platform for label-free sensing, which comprises a slot microring resonator (SMRR) and inner-wall grating (IG). Its detection range is significantly enhanced without the limitation of the free spectral region (FSR) owing to the combination of SMRR and IG. Structural parameters of IG and SMRR are investigated and optimized for favorable transmission properties. The simulation results shows that the IG-SMRR has an ultra-large quasi-FSR of 84.6 nm, and the concentration sensitivities of sodium chloride solutions and D-glucose solutions are up to 960.61 pm/% and 933.06 pm/%, respectively. The investigation on the combination of SMRR and IG is a valuable exploration of label-free sensing application for ultra-large detection range and ultra-high sensitivity in future.


2020 ◽  
Vol 12 (4) ◽  
pp. 427-445
Author(s):  
Lemeng Chao ◽  
Huanhuan Shi ◽  
Kaixuan Nie ◽  
Bo Dong ◽  
Jiafeng Ding ◽  
...  

With the progress of micro-nano technology, the integration of microfluidic technology with a field effect transistor (FET) sensor has made portable biosensing devices of miniaturized structure available. As compared to traditional biosensors that requires large equipment and anti-interfering detection, FET biosensors integrated in microfluidic chips are fully-closed devices with the advantages of high sensitivity and accurate target capturing. Meanwhile FET biosensors integrated in microfluidic chips can be prepared by a simple, batch-produced manufacturing process to achieve label-free electrical detection. Herein, the progress of the FET biosensors integrated in microfluidic chips is reviewed in terms of sensing principle, configuration, and performance. Especially, the applications of these integrated biosensors in the areas of cell detection, gene detection, biomacromolecule detection, ion detection and pH detection are highlighted. This review provides a certain guiding role in the design and development of FET-based biosensors.


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