A.A. El Warraky, A.M. El‐Aziz and Kh.A. Soliman
The paper aims to study the dissolution of Al, Al‐3.84%Cu, Al‐5.22%Cu and Al‐11%Cu alloys in different concentrations of NaCl (10‐5‐10‐1 M).
Abstract
Purpose
The paper aims to study the dissolution of Al, Al‐3.84%Cu, Al‐5.22%Cu and Al‐11%Cu alloys in different concentrations of NaCl (10‐5‐10‐1 M).
Design/methodology/approach
The approach is to use open circuit potential (OCP) and potentiostatic polarization measurements.
Findings
Results obtained showed that, as the Cu content was increased in the Al‐Cu alloys, a steady state potential was rapidly reached. Addition of different concentrations of CuCl2 to 0.5 M NaCl demonstrated that by increasing the concentration of CuCl2 up to 2 ppm a greater increase in the OCP towards more anodic value occurred from the moment of immersion. Further increases in the concentration of CuCl2, up to 600 ppm, exhibited the same behavior.
Originality/value
The results of the study reveal that cathodic current was controlled by the oxygen in solution, while the anodic current increased with increased Cu content in the alloy.
A.A. El Warraky, A.M. El‐Aziz and Kh.A. Soliman
The paper aims to examine the enrichment of Cu, and the type of attack occurring during the dissolution of Al‐3.84%Cu alloy in 0.5 M NaCl.
Abstract
Purpose
The paper aims to examine the enrichment of Cu, and the type of attack occurring during the dissolution of Al‐3.84%Cu alloy in 0.5 M NaCl.
Design/methodology/approach
The approach is to use scanning electron microscopy (SEM) and energy dispersive X‐ray spectroscopy (EDX) and solution analyses using atomic absorption spectrophotometry.
Findings
Examination of the surface after five days of immersion showed that Cu clusters had concentrated around the edges of the specimens and two types of localized corrosion were evident, pitting corrosion and the intergranular attack, which were concentrated mainly around the Cu clusters and in the regions where a higher concentration of Cu was evident. After 80 days of immersion, the higher concentration of Cu was distributed over nearly the entire surface and its concentration differed from one site to another.
Originality/value
The analysis results of the study confirmed the mechanism of simultaneous dissolution.
Parikshit Joshi, Anshu Singh, Garima Joshi and Preeti Singh
In the knowledge management (KM) literature, there are umpteen discussions on knowledge sharing; however, the scholarly community still faces a dearth of literature on knowledge…
Abstract
Purpose
In the knowledge management (KM) literature, there are umpteen discussions on knowledge sharing; however, the scholarly community still faces a dearth of literature on knowledge hiding behavior (KHB) and its determinants. The current study aims to examine the direct effect of dark triad (DT) personality dimensions (machiavellianism, narcissism and psychopathy) on KHB dimensions (rationalized hiding, evasive hiding and playing dumb). Drawing on social control theory, this study also explores the moderating effect of workplace spirituality (WS) on the direct relationship between DT and KHB.
Design/methodology/approach
Using purposive sampling, 281 matched-pair datasets from faculty members working with higher education institutions (HEI) in India have been obtained. The direct relationship has been tested through regression analysis and moderation analysis has been performed using the PROCESS macro for SPSS.
Findings
The study has successfully mapped DT dimensions with KHB dimensions, and it is observed that machiavellians mostly use evasive hiding, narcissists believe in rationalized hiding and paying dumb is mostly used by psychopaths. Workplace spirituality (WS) weakens the direct relationship between DT and KHB.
Practical implications
HEIs are advised to foster a climate conducive to WS by getting faculty to realize that their job is something larger than themselves through developing a sense of community among faculty members.
Originality/value
This empirical study extends the KM literature and expands the scope of bridging the gaps on KHB. It is one of the few studies to examine the impact of DT on KHB with WS as a moderator in HEIs.
Details
Keywords
Tanyatip Kharuhayothin, Weerapong Kitiwong and Warunya Chaitarin
This study leverages an integrated framework that uses the theory of planned behavior (TPB), risk perception and sustainable behavior to investigate the COVID-19 risk perception…
Abstract
Purpose
This study leverages an integrated framework that uses the theory of planned behavior (TPB), risk perception and sustainable behavior to investigate the COVID-19 risk perception of a potentially powerful consumer group – generation Z – on decisions to participate in the domestic tourism stimulus campaign and their willingness to practice socially responsible behaviors.
Design/methodology/approach
Self-administered questionnaires were used to collect data. The study adopts partial least squares-structural equation modelling (PLS-SEM) to examine the data with the final sample of 422 generation Z in Thailand.
Findings
The COVID-19 perceived risk positively affects attitudes, perceived behavioral control and the intention to join domestic tourism campaign, affecting the desire to engage in sustainable behaviors when traveling. Attitude and perceived behavioral control mediated risk perception and the decision to join the campaign. Unlike other studies, generation Z is conscious of the situation but is not risk-averse to travel.
Practical implications
The study offers recommendations (and domestic tourism campaign's features) for government agencies and tourism partitioners, especially developing tourism destinations, to effectively launch domestic tourism campaigns to target generation Z during and after post-pandemic crises.
Originality/value
This study contributes to our limited understanding of generation Z's travel behaviors. It contributes to the extended use of TPB, risk perception and socially responsible conduct of such a specific generation. It is one of the first studies integrating the COVID-19 risk perception of generation Z and their intention to utilize the stimulus campaign.
Details
Keywords
F. Aziz, K. Sulaiman, Wissam Khayer Al-Rawi, Z. Ahmad, M.H. Sayyad, Kh. S. Karimov, L.L. Wei and M. Tahir
The purpose of this paper is to investigate the effect of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) on improvement of physical and electrical properties of vanadyl…
Abstract
Purpose
The purpose of this paper is to investigate the effect of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) on improvement of physical and electrical properties of vanadyl phthalocyanine derivative. The correlation between the physical characteristics of the active layers, comprising vanadyl 2,9,16, 23-tetraphenoxy-29H,31H-phthalocyanine (VOPcPhO) and PCBM, and the electrical properties of metal/organic/metal devices have been studied. The use of soluble vanadyl phthalocyanine derivative makes it very attractive for a variety of applications due to its tunable properties and high solubility.
Design/methodology/approach
The sandwich type structures Al/VOPcPhO/Al and Al/VOPcPhO:PCBM/Al were fabricated by spin casting the active organic layers between the top and bottom (aluminum) electrodes. The stand-alone (VOPcPhO) and composite (VOPcPhO:PCBM) thin films were characterized by X-ray diffraction, atomic force microscopy, UV/Vis and Raman spectroscopy. The electronic properties of the metal/organic/metal devices were studied using current-voltage (I-V) characteristics in dark at room temperature.
Findings
The values of barrier height for Al/VOPcPhO/Al and Al/VOPcPhO:PCBM/Al devices were obtained from the forward bias I-V curves and were found to be 0.7 eV and 0.62 eV, respectively. The present study indicates that the device employing VOPcPhO:PCBM composite film as the active layer, with better structural and morphological characteristics, results in reduced barrier height at the metal-organic film interface as compared to the one fabricated with the stand-alone film.
Research limitations/implications
It is shown that doping VOPcPhO with PCBM improves the crystallinity, morphology and junction properties.
Practical implications
The spin coating technique provides a simple, less expensive and effective approach for preparing thin films. The soluble VOPcPhO is conveniently dissolved in a number of organic solvents.
Originality/value
The physical properties of the VOPcPhO:PCBM composite thin film and the electrical properties of the composite thin-film-based metal/organic/metal devices have not been reported in the literature, as far as our knowledge is concerned.
Details
Keywords
Awad I. Ahmed, S.N. Basahel and R.M. Khalil Chemistry
The inhibitive effect of some morpholine and thiosemicarbazide derivatives on the dissolution of aluminium in 2M HCI has been investigated by using thermometric, weight loss and…
Abstract
The inhibitive effect of some morpholine and thiosemicarbazide derivatives on the dissolution of aluminium in 2M HCI has been investigated by using thermometric, weight loss and hydrogen evolution techniques. The effect of the inhibitors on the protection efficiency and the corrosion rate were determined at various inhibitor concentrations and temperatures. It was observed that the percentage inhibition of aluminium increases with the increase of inhibitor concentration and decreases with rise of reaction temperature. Retardation of dissolution is due to weak adsorption of the additives on the metal surface. The order of inhibition efficiency of the inhibitors used depends on the number of adsorption sites in the molecule, their charge density and molecular size.
Nasser S. Kh. Al-Enzy, Reza Monem and Shamsun Nahar
This paper aims to examine the association between the adoption experience of the International Financial Reporting Standards (IFRS) and the quality of reported earnings in the…
Abstract
Purpose
This paper aims to examine the association between the adoption experience of the International Financial Reporting Standards (IFRS) and the quality of reported earnings in the Gulf Cooperation Council (GCC) region – a region that exhibits several features of emerging economies.
Design/methodology/approach
The authors analyse a hand-collected dataset of 222 firms across 4 countries in the GCC region over the period 2012–2017 and measure “IFRS experience” as the number of years since a country has mandatorily adopted the IFRS. In measuring earnings quality, the authors focus on two properties of reported earnings: persistence and accruals quality and employ multivariate regression models based on two-way cluster-robust standard errors and fixed-effects.
Findings
This study’s findings suggest that earnings persistence is decreasing, and discretionary accruals are increasing in IFRS experience in the GCC region over the period 2012–2017. The authors conclude that reported earnings quality has declined following IFRS adoption in this sample.
Research limitations/implications
The authors contribute to the IFRS literature in the GCC region, which is in its infancy.
Practical implications
This study’s findings have important policy implications for countries that are about to adopt or are in the early implementation stage of IFRS and suggest that strong enforcement of accounting standards along with improvement in the institutional environments might be needed for improving financial reporting quality.
Originality/value
The authors provide the first cross-country evidence on the relation between IFRS adoption in the GCC region and earnings quality. Moreover, unlike most prior studies, the authors employ a continuous measure that is superior to a binary measure in capturing the effect of IFRS adoption.
Details
Keywords
Lin Wang, Huaxia Gao and Yang Zhao
Contextual cues have become a hot research topic in the field of mobile consumer behavior, owing to the continuous rise of digital marketing. However, the complex online shopping…
Abstract
Purpose
Contextual cues have become a hot research topic in the field of mobile consumer behavior, owing to the continuous rise of digital marketing. However, the complex online shopping scene makes it challenging to directly identify the association between the characteristics of contextual cues and consumer behavior. Presently, few studies have only systematically extracted and refined the types and characteristics of contextual cues. The purpose of this study is to explore the types and mechanisms of contextual cues in online shopping scenarios.
Design/methodology/approach
This study uses the word2vec algorithm, grounded theory and co-occurrence cluster method, along with online shopping word-of-mouth (WOM) text and consumer behavior theory, in order to explore different types of contextual cues and its efficiency from 5,619 comment corpus.
Findings
This study puts forward the following conclusions. (1) From the perspective of online shopping, contextual cues comprise aesthetic perception cues, value perception cues, trust-dependent cues, time perception cues, memory attention cues, spatial perception cues, attribute cues and relationship cues. (2) Based on the online shopping scenarios, contextual cues and their interaction effects exert an effect on consumer satisfaction, recommendation, purchase and return behavior.
Originality/value
The study conclusions are helpful to further reveal the deep association between contextual cues and consumer behavior in the process of online shopping, thus providing practical and theoretical enlightenment for enterprises to not only effectively reshape the scene but also promote the consumers' active purchase behavior.
Details
Keywords
M. Abdallah, A.Y. El‐Etre, M.G. Soliman and E.M. Mabrouk
To study the effects of the sodium salts of molybdate, tungstate and monovanadate as well as some derivatives of Neville‐Winter acid azo dyes on the corrosion of carbon steel in…
Abstract
Purpose
To study the effects of the sodium salts of molybdate, tungstate and monovanadate as well as some derivatives of Neville‐Winter acid azo dyes on the corrosion of carbon steel in 3.5 percent NaCl solution.
Design/methodology/approach
Open circuit potential measurement and potentiostatic polarization techniques have been used.
Findings
It was found that all the compounds had inhibition effects on carbon steel dissolution. Inhibition efficiency (IE) increased with increase in inhibitor concentration. The process of inhibition was attributed to the formation of an adsorbed film on the metal surface, which protects the metal against the corrosive medium. The adsorption of these compounds on the steel/chloride interface was found to follow Freundlich adsorption isotherm behaviour.
Originality/value
Proves the effectiveness of the sodium salts of molybdate, tungstate and monovanadate as well as some derivatives of Neville‐Winter acid azo dyes on the corrosion of carbon steel in 3.5 percent NaCl solution.
Details
Keywords
Yassine OUBAHOU, Khalid EL OUAFA and Mustapha BENGRICH
This study aims to assess the impact of the introduction of International Financial Reporting Standards (IFRS) on the informational relevance of accounting figures for Moroccan…
Abstract
Purpose
This study aims to assess the impact of the introduction of International Financial Reporting Standards (IFRS) on the informational relevance of accounting figures for Moroccan companies listed on the Casablanca Stock Exchange. Specifically, it seeks to determine whether IFRS adoption improves the ability of accounting data to reflect share price movements.
Design/methodology/approach
The empirical analysis covers a sample of 27 Moroccan listed companies over a six-year period (2015–2020), with a total of 162 observations. The study tests various hypotheses through association studies to evaluate the effectiveness of accounting figures in reflecting share prices in the pre-IFRS and post-IFRS periods. The analysis utilizes Ohlson's (1995) price model, which is widely used in the literature for such assessments.
Findings
The results show that both earnings and shareholders’ equity are more effective in explaining share price variations in the post-IFRS period than in the pre-IFRS period. In particular, equity demonstrates greater explanatory power than earnings. The combined explanatory power of equity and earnings is significantly stronger in the post-IFRS period, suggesting that the adoption of IFRS has played a key role in enhancing the quality of financial information disclosed in the Moroccan market.
Practical implications
Theoretical implications – this study highlights that the adoption of IFRS reduces information asymmetry, thereby mitigating conflicts of interest and agency costs. By aligning accounting practices with international standards, IFRS enhance transparency and governance, fostering a more reliable business environment. Practical implications – the study indicates that IFRS adoption improves the transparency, reliability and comparability of financial information, enhancing investor confidence and making the Moroccan financial market more attractive. It provides useful guidance for regulators, businesses and countries considering IFRS implementation, demonstrating the importance of these standards in boosting market transparency and attracting global investments.
Originality/value
This study explores the impact of IFRS adoption on the relevance of financial information in Morocco, a topic that has been underexplored in emerging economies. It fills a gap in the literature by providing insights into IFRS adoption in a specific context, thus contributing to the ongoing debate on their effectiveness in developing economies.