Search results

1 – 10 of over 1000
Per page
102050
Citations:
Loading...
Access Restricted. View access options
Article
Publication date: 3 May 2016

R. Usop, Z.H.Z Abidin, N.A. Mazni, A.N. Hadi, N.A. Halim, R.M. Taha, M.A. Careem, S.R. Majid and A.K. Arof

This paper aims to study the colour stability of chlorophyll and the effect of copper (II) nitrate – Cu(NO3)2 – as an additive in natural dye coating films after being exposed to…

291

Abstract

Purpose

This paper aims to study the colour stability of chlorophyll and the effect of copper (II) nitrate – Cu(NO3)2 – as an additive in natural dye coating films after being exposed to ultraviolet-A (UV-A).

Design/methodology/approach

The natural dye was extracted from the leaves of Cassia alata L. using absolute ethanol as the solvent. The extract was divided into two parts and, one of it was added with 3 wt.% Cu(NO3)2 as an additive. The polymer blend of poly(methyl methacrylate) (PMMA) and acrylic polyol was used as the coating binder. Both parts of the dye with and without additive were mixed with the blended polymer in a specific ratio. The resulted mixtures were applied as coating films on glass substrates. The colour stability of the coating films on exposure to UV-A with the time of exposure was observed with Commission internationale de l’éclairage (CIE) L*a*b* colour coordinates. The hidden power by the means of reflectivity and glossiness of the coatings was also studied. Statistical standard deviation (STD) was used to analyse the data.

Findings

The test showed that the coating films containing Cu(NO3)2 had smaller colour differences, (ΔE*) indicating higher colour stability. The analysis on hidden power also showed that the coating film with Cu(NO3)2 was 1.6 times more stable than the film without additive. All the measurements in this study were observed within 35 days of duration.

Research limitations/implications

This paper implies the potential of using natural dye extracted from Cassia alata L. leaves as a stable dye colourant for coating applications.

Practical implications

The coating film developed in this study is suitable for glass substrate applications.

Originality/value

A new method of preparing solvent-based coating film from PMMA–acrylic polyol with chlorophyll colourant is introduced in this study.

Details

Pigment & Resin Technology, vol. 45 no. 3
Type: Research Article
ISSN: 0369-9420

Keywords

Access Restricted. View access options
Article
Publication date: 12 March 2019

L. Sulaiman, Z.H.Z. Abidin, S.A.M. Yunus, N.A. Mazni, A.N. Hadi, A.K. Arof and K. Simarani

This paper aims to discuss about the benefits of Cu(NO3)2 applied in coating paint film that consists of plant extract from Cassia Alata. Cu(NO3)2 has been added to the coating…

205

Abstract

Purpose

This paper aims to discuss about the benefits of Cu(NO3)2 applied in coating paint film that consists of plant extract from Cassia Alata. Cu(NO3)2 has been added to the coating paint film as a colour stabilizer and as an antifungal property by forming a zone of inhibition towards fungal growth.

Design/methodology/approach

The coating paint film resin consists of a mixture of poly (methyl methacrylate) (PMMA) and acrylic polyol. The coating paint film’s performances were observed in terms of visible optical and physical appearance.

Findings

When exposed to the fungus Trichoderma Sp., a zone of inhibition of 208 mm2 was formed around the coating paint film and therefore it gave the coating paint films an antifungal property. The commission internationale de l’éclairage (CIE) L*a*b* colour coordinate system was used to identify the colour changes in the coating paint film and it was found that the addition of Cu(NO3)2 to the coating paint film has a better colour stability, as it has a lower standard deviation (STD) value of 6.46 than the pure dye coating paint film of 8.95. The gloss of coating paint film with the addition of Cu(NO3)2 was found to be have a more stable gloss based on its smaller STD value at both angles taken at 20° and 60°.

Research limitations/implications

The Cassia Alata plant has different amount of antifungal properties based on location its growth.

Practical implications

The coating paint film developed in this study is suitable for indoor applications.

Originality/value

The plant extract from the Cassia Alata gives the coating paint film an antifungal property.

Details

Pigment & Resin Technology, vol. 50 no. 2
Type: Research Article
ISSN: 0369-9420

Keywords

Access Restricted. View access options
Article
Publication date: 9 May 2019

Z.H.Z. Abidin, N.S.A. Manah, A.N. Hadi, N.S. Saugi, F.A. Fuad, N.A. Mazni, H.C. Hassan, M.A. Careem and A.K. Arof

This paper aims to focus on a comparison study of the visible stability of natural blue dye consisting anthocyanin molecules extracted from Clitoria ternatea in coating films.

170

Abstract

Purpose

This paper aims to focus on a comparison study of the visible stability of natural blue dye consisting anthocyanin molecules extracted from Clitoria ternatea in coating films.

Design/methodology/approach

The coating films were prepared by mixing the blue dye with poly(acrylamide-co-acrylic acid) in three different weight ratios. Samples were coded as 10PBA, 15PBA and 20PBA, where PBA is the abbreviation for poly acrylamide-co-acrylic acid, blue dyes and anthocyanin. The number at the beginning of each code represents the weight percentage of poly(acrylamide-co-acrylic acid) to natural blue dye. The mixtures were applied on separate glass substrates to form coating films. Another set of samples were prepared for the comparison study with a commercial acrylic clear coat (cc) applied on the surface of the 10PBA, 15PBA and 20PBA coating films. These coating films were coded 10PBAcc, 15PBAcc and 20PBAcc. The purpose of the clear coat is to observe how it affects the colour stability of the blue coating films with respect to time. All samples were exposed to the ultraviolet (UV) source, an 18 W Philips TL-D 18w/830 UV fluorescent lamp. The UV lamp was placed 15 cm above the surface of the samples for 35 days. The colour of the coatings was measured using CIE L*a*b* colour space coordinate.

Findings

The results obtained show 10PBA and 10PBAcc have the highest colour stability after 35 days of exposure to UV light. The reflectivity of the coating films was also measured during exposure to UV lamp. Reflectivity measurements also showed that 10PBA and 10PBAcc coating films had the highest reflective stabilities.

Research limitations/implications

The potential of using natural blue dye consisting anthocyanin in coating film to obtain high colour stability.

Practical implications

The coating film developed in this work is suitable to be applied on glass substrates.

Originality/value

The application of anthocyanin dye extracted from the Clitoria ternatea L. as a colourant in coating films

Details

Pigment & Resin Technology, vol. 48 no. 4
Type: Research Article
ISSN: 0369-9420

Keywords

Access Restricted. View access options
Article
Publication date: 29 May 2024

Noor Ul Hadi and Sadia Aftab Sheikh

To paint a more comprehensive picture of organizational ambidexterity in the hotel industry, the purpose of this study is to investigate how and when to develop a dual operating…

107

Abstract

Purpose

To paint a more comprehensive picture of organizational ambidexterity in the hotel industry, the purpose of this study is to investigate how and when to develop a dual operating system following a theoretical rationale supported by the three-stage model of creativity and organization support theory.

Design/methodology/approach

Survey-based research strategy and questionnaire-based data collection techniques have been used in the current study. data was randomly collected from human resource managers of 16 four-star and five-star hotels. The 200 questionnaires were distributed, out of which 182 usable questionnaires were analyzed using “PROCESS macro”.

Findings

The findings show that the integrative moderated-mediation model fits the data well. Hence, the three-stage model of creativity and organization support theory is useful, and the numerical evidence verified its applicability in the hospitality industry. To conclude, the results of this study, when applied to the hotel industry, can do marvels by being more innovative with their services.

Originality/value

More recently, it has been found that long-term success is only achievable and can be sustained if exploitative and explorative innovations are balanced. So far, however, little is known about how to achieve organizational ambidexterity in the hospitality industry.

Details

Business Process Management Journal, vol. 30 no. 4
Type: Research Article
ISSN: 1463-7154

Keywords

Access Restricted. View access options
Article
Publication date: 6 July 2015

S.V. Lee, R. Usop, A.N. Hadi, N.A. Mazni, S.R. Majid, A.K. Arof, N.A. Halim and Z.H.Z. Abidin

The purpose of this paper is to observe the thermal and colour stabilities of coating films consisting of natural dye anthocyanin colourant with acid and nitrate salt as…

138

Abstract

Purpose

The purpose of this paper is to observe the thermal and colour stabilities of coating films consisting of natural dye anthocyanin colourant with acid and nitrate salt as additives.

Design/methodology/approach

The natural dye was extracted from Hibiscus sabdariffa L. (Roselle) by using distilled water as solvent. The extracted dye was mixed with 1 weight per cent hydrochloric acid and 5 weight per cent calcium nitrate to conduct the comparison study. The dye samples were than mixed with poly (vinyl alcohol) (PVA). The mixtures were applied on glass panels to form coating films. The coating films were left to dry for 24 hours. The thermal stability of coating films was investigated by using thermogravimetric analysis (TGA). The amorphousness coating films molecular structures were observed by using x-ray diffraction (XRD). CIE L*a*b* colour coordinate space technique was used to investigate the coating films colour stability against ultraviolet (UV).

Findings

The results show that addition of hydrochloric acid (HCl acid) enhanced thermal stability of PVA-anthocyanin coating and shifted the degradation temperature to higher temperature at 300°C. HCl acid also improved UV stability of the coating system significantly with the reduced ΔE from 26.67 to 16.89. Addition of calcium nitrate (Ca(NO3)2) salt promotes good interaction with PVA-anthocyanin system that caused structural changes, improved thermal stability and increased Tg from 61.5 to 83.1°C.

Research limitations/implications

The potential of using natural dye extracted from plant as renewable material.

Practical implications

The coating films developed in this works are suitable for glass substrate application.

Originality/value

Development of water-based coating from PVA binder with anthocyanin colourant is introduced in this study.

Details

Pigment & Resin Technology, vol. 44 no. 4
Type: Research Article
ISSN: 0369-9420

Keywords

Access Restricted. View access options
Article
Publication date: 27 February 2024

Wagdi Rashad Ali Bin-Hady and Jamal Kaid Mohammed Ali

This study probed the impact of using learning technologies (LT) on developing Yemeni English as a foreign language (EFL) students' autonomy and creativity toward English language…

161

Abstract

Purpose

This study probed the impact of using learning technologies (LT) on developing Yemeni English as a foreign language (EFL) students' autonomy and creativity toward English language learning. Also, the research gauged if LT impacts learners' autonomy and creativity across gender and university-type variables.

Design/methodology/approach

The study utilized a valid and reliable questionnaire, comprising 20 close-ended items, which was administered to 109 Yemeni EFL undergraduate students.

Findings

The researchers found that LT positively impacts learners' creativity and autonomy, with mean scores of 4.09 and 3.86, respectively. Furthermore, the results showed a medium correlation between creativity and autonomy with a correlation coefficient of r = 0.63 at a probability of Sig = 0.00. Likewise, the results revealed that LT impacted female learners' creativity more significantly than their male counterparts (Sig = 0.047). Nevertheless, no significant differences were found pertaining to the impact of LT on students' autonomy across public and private universities (Sig = 0.213).

Social implications

EFL teachers are advised to encourage their students' autonomy and creativity throughout their lifelong learning journey in order to adapt to the ever-changing demands of the world.

Originality/value

This study investigates the impact of learning technology on Yemeni EFL students' autonomy and creativity.

Details

Library Hi Tech, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0737-8831

Keywords

Access Restricted. View access options
Article
Publication date: 2 March 2015

S.V. Lee, A.N. Hadi, Z.H.Z. Zainal Abidin, N.A. Mazni, N.A. Halim, R. Usop, H.C. Hassan, S.R. Majid and A.K. Arof

The purpose of this paper is to observe the colour and thermal stability of natural red dye consisting of anthocyanin with addition of different aqueous acids and applied as…

330

Abstract

Purpose

The purpose of this paper is to observe the colour and thermal stability of natural red dye consisting of anthocyanin with addition of different aqueous acids and applied as coating films.

Design/methodology/approach

The natural red dye was extracted from Hibiscus sabdariffa L. (roselle) flowers and mixed with 1 per cent hydrochloric acid, 5 per cent acetic acid, 5 per cent citric acid and 5 per cent oxalic acid. All the dye samples were exposed to heat and UV-B to observe the colour stability by calculating the half-life and rate of reaction. In coating film application, each of the dye samples was mixed with 25 wt% of poly(vinyl alcohol) (PVA) and applied on to a glass substrate. The coating samples’ colour stability was observed by using CIE L*a*b* colour space coordinates. The coating films’ weight loss stability against temperature was observed by using thermogravimetric analysis.

Findings

Addition of hydrochloric acid enhances the thermal and UV stability of the anthocyanin natural dye. This can be observed from the calculation of the half-life of the dye. The half-life values for the thermal and UV stability studies were 1,155 hours and 210 hours, respectively. In coating films, the sample with addition of acetic acid showed the highest colour stability with colour difference (ΔE*) value 8.95.

Research limitations/implications

The coating films developed in this work are not suitable to be applied on metal substrates due to the presence of water, which can contribute to the corrosion formation.

Practical implications

The coating films developed in this work are suitable for washable coating application. In other words, they are non-permanent coatings applied on a glass substrate.

Originality/value

Development of water-based coatings from PVA binder with anthocyanin colourant is introduced in this study.

Details

Pigment & Resin Technology, vol. 44 no. 2
Type: Research Article
ISSN: 0369-9420

Keywords

Access Restricted. View access options
Article
Publication date: 12 March 2018

Eman Refaat and Ali Hadi

The purpose of this paper is to construct, for the first time, composite index for Egypt that measures the economic and social rights fulfillment (ESRF) based on socioeconomic…

350

Abstract

Purpose

The purpose of this paper is to construct, for the first time, composite index for Egypt that measures the economic and social rights fulfillment (ESRF) based on socioeconomic surveys at the household/individual levels.

Design/methodology/approach

The paper highlights some of the statistical debatable issues about composite indices and focuses mainly on six of them. Those issues are indicators selection, handling missing data, identification of and dealing with outliers, scale of measurement, computing the margin of error, weights assigned for indicators and domains and aggregation method. Handling these problematic issues gave rise to a rigorous index.

Findings

The quality of economic and social rights fulfillment index (ESRFI) is judged by its bootstrap standard error. Based on these margin of errors, confidence intervals can be computed and rigorous comparisons across all disaggregation levels of the ESRFI can be made. The results shows that the overall index is accurate and representative in measuring the ESRF in Egypt. Comparisons between rural and urban regions indices show that the rural areas are always worse than the urban areas in all levels of dimensions, especially for the Right to Education and Adequate Housing.

Research limitations/implications

The ESRFI is not very current because it is based on the 2010 Egyptian Household Conditions Observatory Survey (EHCOS), which is the latest published version of the survey with complete variables for the index data. When the next EHCOS becomes available, an updated ESRFI can be easily and quickly constructed.

Practical implications

The ESRFI could strengthen policy formulation that takes into account ESRF, especially by highlighting the situation in different regions and disaggregation levels.

Social implications

The proposed ESRFI would strengthen policy formulation that takes into account ESRF, especially by highlighting the situation in different regions and different disaggregation levels.

Originality/value

The paper emphasizes the importance of recognizing and handling of the six problematic issues that arise when constructing composite indices. The paper presents the first ESRFI for Egypt and demonstrates the rigor of its construction.

Details

International Journal of Sociology and Social Policy, vol. 38 no. 1/2
Type: Research Article
ISSN: 0144-333X

Keywords

Access Restricted. View access options
Article
Publication date: 12 November 2024

Amr Ali Mohamed Abdelgawwad El-Sehrawy, Subasini Uthirapathy, Abhinav Kumar, Ola Kamal A. Alkadir, Madan Lal, Parjinder Kaur and Ahmed Hussein Zwamel

Recent trials have found that propolis supplementation can beneficially reduce blood pressure (BP) in adults, but there is no definitive consensus on this topic. The purpose of…

11

Abstract

Purpose

Recent trials have found that propolis supplementation can beneficially reduce blood pressure (BP) in adults, but there is no definitive consensus on this topic. The purpose of this study is to provide an overview and update the current documents regarding the effects of propolis supplementation on BP by presenting a systematic review and meta-analysis.

Design/methodology/approach

The systematic search was conducted, considering all studies published up to July 2024, in the following databases: PubMed, Scopus, Cochrane Library and ISI Web of Science. Data were pooled by using the random-effects model, and weighted mean difference (WMD) was considered as the summary effect size.

Findings

In this systematic review and meta-analysis, eight clinical trials were included. The obtained results show that propolis supplementation caused a significant decrease in systolic BP (WMD = −3.93 mmHg, 95% CI = −7.05 to −0.82, p = 0.01 and I2 = 45.2%). However, the meta-analysis results showed that propolis supplementation did not significantly change the levels of diastolic BP (WMD = −1.64 mmHg, 95% CI = −4.60 to 1.32, p = 0.27 and I2 = 74.0%).

Originality/value

The findings of this study suggest that propolis supplementation may be used as a dietary supplement to improve systolic BP, but further studies are needed to confirm these results.

Details

Nutrition & Food Science , vol. 55 no. 2
Type: Research Article
ISSN: 0034-6659

Keywords

Access Restricted. View access options
Book part
Publication date: 25 April 2022

Adetunji Kamoli, Razali Adul Hamid and Syamsul Hendra Bin Mahmud

Under-reporting of an occupational accident is commonly found at both organisational and individual levels. It interferes with the reality of health and safety in organisations

Abstract

Under-reporting of an occupational accident is commonly found at both organisational and individual levels. It interferes with the reality of health and safety in organisations and countries. It also hinders the ability to identify trends, recognise priorities, improve strategies, and allocation of resources for accident prevention. This study examined the reasons for the under-reporting of occupational accidents at the organisation level in the Nigerian construction industry. A review of the literature was conducted on the under-reporting of occupational accidents. Thereafter, a field survey with questionnaires was distributed to solicit information from the Nigerian construction professionals in the Federal Capital Territory, Abuja, Nigeria. 300 questionnaires were distributed, and 235 responses were received and analysed with Microsoft Excel and SPSS software by applied relative importance index and ranked. The study found that among the top-ranked reasons for under-reporting of occupational accidents by the organisation is to maintain a reputation. It is therefore important to increase awareness on the reporting of occupational accidents and its importance in accident prevention programmes by the regulatory bodies. Also, more collaborative efforts, standards, and policies should be put in place by the governments for ensuring reporting and record-keeping of accidents in the Nigerian construction industry. Records of dangerous incidents are the key indicator for the organisation for the improvement in the prevention of hazards. The study, therefore, concludes that there should be proper recording and surveillance of occupational accidents, hazards, and their related background causes in reaction to quick and complex variations in work-life.

Details

Sustainability Management Strategies and Impact in Developing Countries
Type: Book
ISBN: 978-1-80262-450-2

Keywords

1 – 10 of over 1000
Per page
102050