Y.M. Abu Ayana, S.M. El‐Sawy and S.H. Salah
Zinc‐ferrite pigment was prepared by solid‐state reaction. A mixture of α‐Fe2O3 and ZnO in a molar ratio of 1:1 was fired at 1,200°C. X‐ray diffraction measurements proved that…
Abstract
Zinc‐ferrite pigment was prepared by solid‐state reaction. A mixture of α‐Fe2O3 and ZnO in a molar ratio of 1:1 was fired at 1,200°C. X‐ray diffraction measurements proved that the reacted material crystallized into a spinal structure. Measurement of the pigment specification and properties were carried out according to standard international methods. The pigment extract and the extract of the pigment‐linseed oil mixture were examined for use in protecting steel panels against rust. The prepared pigment was incorporated in some paint formulations. Physical, chemical and mechanical properties of the formulated paint films were studied and also tested for corrosion resistance. Finds that zinc ferrite is a basic pigment and can be recommended for use in anti‐corrosive paints. High corrosion‐resistant coatings can be obtained by incorporating zinc‐ferrite pigment in organic coating systems that cannot saponify; protection increases as the pigment‐binder ratio increases. Chemically follows up and physically emphasizes the mechanism of corrosion protection by the use of a Mossbauer spectroscope.
Details
Keywords
Sana Ben Salah and Mohamed Bechir Ben Hamida
The purpose of this paper is to compare the thermal effect between square and circular geometry of light emitting diode (LED) with respect of the same surface for the intent of…
Abstract
Purpose
The purpose of this paper is to compare the thermal effect between square and circular geometry of light emitting diode (LED) with respect of the same surface for the intent of reducing the junction temperature.
Design/methodology/approach
The heat equation is presented in a dimensionless form. To solve it numerically subject to the boundary conditions, the authors realized a three-dimensional code with Comsol Multiphysics.
Findings
The model is validated with previously published works. The authors found a good agreement.
Originality/value
New design of heat sink is improved for circular LED and a reduction of 18 per cent of the junction temperature is permitted. The authors study the influence of various parameters: number and length of fins and number and width of splits. New distribution of multichip LED in circular geometry permits to put 42 chips instead of 36 chips with respect of the same surface and pitch and with reduction of the junction temperature by 16 per cent.
Details
Keywords
Recently, a new concept “digital sustainability” has emerged concerning the sustainability of businesses. Digital sustainability in the business world is related to the existence…
Abstract
Recently, a new concept “digital sustainability” has emerged concerning the sustainability of businesses. Digital sustainability in the business world is related to the existence of businesses that are compatible with rapidly developing technologies. Digital sustainability depends on the ability to businesses to adapt digitally to business environment and successfully transform their internal processes by digitizing their managerial processes. Especially during the COVID-19 pandemic, the deficiencies, glitches, gaps, and weaknesses in various internal and external organizational systems and digital mechanisms of enterprises have become more visible. This section reveals how important digital technologies are for adding social and environmental value to sustainable businesses. Besides, this section discusses how digital business models affect sustainability. For this purpose, in this section, sustainable business models and the sustainable business model components of digital technologies are discussed from a corporate perspective.
In this section, respectively, digitalization and digitalization in businesses under the light of sustainability, and digital sustainability in businesses are discussed. Then, basic concepts of digital sustainability in businesses, the relationship between digital sustainability and e-commerce, the positive impacts of digital sustainability on businesses, digital sustainability by countries and digital sustainability in various sectors are discussed accordingly. Many of the businesses with sustainable business models and strategies use digital technologies to design innovative business models and to provide a relatively unique competitive advantage among their rivals. Thus, by optimizing at every digital stage of business, companies can achieve digital sustainability. Companies could add unique value that cannot be imitated from any other businesses by only maintaining digital sustainability.
Details
Keywords
This study investigates the impact of three parameters such as: number of LED chips, pitch and LED power on the junction temperature of LEDs using a best heat sink configuration…
Abstract
Purpose
This study investigates the impact of three parameters such as: number of LED chips, pitch and LED power on the junction temperature of LEDs using a best heat sink configuration selected according to a lower temperature. This study provides valuable insights into how to design LED arrays with lower junction temperatures.
Design/methodology/approach
To determine the best configuration of a heat sink, a numerical study was conducted in Comsol Multiphysics on 10 different configurations. The configuration with the lowest junction temperature was selected for further analysis. The number of LED chips, pitch and LED power were then varied to determine the optimal configuration for this heat sink. A general equation for the average LED temperature as a function of these three factors was derived using Minitab software.
Findings
Among 10 configurations of the rectangular heat sink, we deduce that the best configuration corresponds to the first design having 1 mm of width, 0.5 mm of height and 45 mm of length. The average temperature for this design is 50.5 C. For the power of LED equal to 50 W–200 W, the average temperature of this LED drops when the number of LED chips reduces and the pitch size decreases. Indeed, the best array-LED corresponds to 64 LED chips and a pitch size of 0.5 mm. In addition, a generalization equation for average temperature is determined as a function of the number of LED chips, pitch and power of LED which are key factors for reducing the Junction temperature.
Originality/value
The study is original in its focus on three factors that have not been studied together in previous research. A numerical simulation method is used to investigate the impact of the three factors, which is more accurate and reliable than experimental methods. The study considers a wide range of values for the three factors, which allows for a more comprehensive understanding of their impact. It derives a general equation for the average temperature of the LED, which can be used to design LED arrays with desired junction temperatures.
Details
Keywords
Manuela Escobar-Sierra, Alejandra García-Cardona and Fidel León-Darder
In this regard, this paper aims to wonder how willing to co-create sustainable practices customers of irresponsible Industry 4.0 (I4.0) companies are? With this purpose, the…
Abstract
Purpose
In this regard, this paper aims to wonder how willing to co-create sustainable practices customers of irresponsible Industry 4.0 (I4.0) companies are? With this purpose, the authors began introducing I4.0 and sustainability, showing their theoretical gaps.
Design/methodology/approach
I4.0 has recently spread with its technological developments and social, economic and political ambitions, facing challenges-related, for example, to the implementation of sustainable practices and the stakeholders’ participation.
Findings
Then the authors conduct a literature review following a sequential mix-method approach that begins with a bibliometric analysis and ends with a content study to propose a conceptual model for I4.0 and sustainability. Once the authors understood the theoretical gaps in the framework of the conceptual model, the authors conducted an empirical verification between clients of a Colombian company of the I4.0 belonging to the logistic sector, specifically of the deliveries, asking them about the labor issues that the company faces with delivery people and their willingness to co-create. The authors analyzed the collected data through a structural equation modeling model, where the authors found that customers’ willingness to co-create depends on intrinsic behaviors like “responsible behavior,” followed by extrinsic behaviors such as “helping.”
Originality/value
In fact, stakeholders may support companies, but customers must learn how to assume a critical posture during their purchase decision.
Details
Keywords
F.F. Abdel‐Mohsen and H.S. Emira
To prepare of fine particle size magnesium ferrite pigments by sol‐gel method.
Abstract
Purpose
To prepare of fine particle size magnesium ferrite pigments by sol‐gel method.
Design/methodology/approach
Different magnesium ferrite pigments with stoichiometric ratios were prepared by sol‐gel and dispersion methods. The characterisation of magnesium ferrite pigments were based on X‐ray diffraction, transmission electron microscope, particle size distribution, thermal and magnetometric analyses.
Findings
The type of polymer and the starting inorganic materials (oxides or salts) have a significant effect on the properties of the magnesium ferrite pigments prepared.
Research limitations/implications
The magnesium ferrite pigments, prepared and used in the work reported here were synthesised from magnesium and iron oxides, oxalates and chlorides. Urea formaldehyde resin and acrylic polymer were used as the dispersing media. Various other materials, e.g. carboxymethyl cellulose, ethoxy methyl cellulose, polyvinylalcohol and 2‐hydroxyethyl methacrylate and polyacrylamide can also be used to achieve similar effect.
Practical implications
The sol‐gel method provided a fine particle size and different particle shapes. Therefore, the method of preparation could be used to produce fibres, films and monoliths.
Originality/value
The magnesium ferrite pigments prepared could be use in numerous paints for steel protection.
Details
Keywords
Soya milk possesses dietetic properties, which include lower contents of saturated fat, cholesterol and lactose, and can reduce the risk of cardio vascular diseases. Partial…
Abstract
Purpose
Soya milk possesses dietetic properties, which include lower contents of saturated fat, cholesterol and lactose, and can reduce the risk of cardio vascular diseases. Partial substitution of milk solids with soya solids during the preparation of yoghurt further enhances its dietetic features.
Design/methodology/approach
Attempt has been made to highlight the nutritional and therapeutic properties of soya milk and its suitability for the manufacture of soyoghurt with enhanced dietetic properties. Basic steps for the manufacture of soyoghurt, such as preparation of soya milk base, addition of stabilizers, sweetening agents, starter cultures and flavors and storage stability of the finished products are described.
Findings
Soya solids in various forms such as soya milk, soya bean paste, soya protein concentrate and soya bean flour may be adopted during the manufacture of soyoghurt, but their concentration must be kept within the limits to sustaining the acceptability of the product. Problem of objectionable bean flavour and slower metabolic activity of starter cultures in soya milk can be solved with starter manipulation and introduction of sweetening agents and flavours.
Originality/value
Possession of nutritional and therapeutic qualities by soya beans have led to their exploitation for the manufacture of soyoghurt. Consumption of soyoghurt among health conscious people and allergic sufferers in search of meat replacer and dairy alternatives should be encouraged.
Details
Keywords
Yi‐Long Jaw, Ru‐Yu Wang and Carol Ying‐Yu Hsu
Although the concept of branding has been considered extensively in products and services, branding in Chinese is a relatively emerging phenomenon. This paper aims to present the…
Abstract
Purpose
Although the concept of branding has been considered extensively in products and services, branding in Chinese is a relatively emerging phenomenon. This paper aims to present the enlivenment of branding in Chinese within the cross‐strait markets of Taiwan and Mainland China, which underlies various ideologies.
Design/methodology/approach
This study primarily reviews literatures of brand and brand name translation, defines the essentiality of brand naming, and outlines the branding strategies for entering cross‐strait markets. Furthermore, this study validates the using of substantially interpreted brands that support the authors' four developed propositions.
Findings
This study compares substantially interpreted brands in cross‐strait markets with a reference to commonly used translation methods. The results illustrate interesting ideologies among cross‐strait markets and can help managers achieve global brand recognition.
Research limitations/implications
Since China and Taiwan share the same Chinese culture, the qualitative method proposed by the present authors is more applicable to practitioners who are eager to pursue branding in cross‐strait markets. Thus, the relevant techniques may not be applicable to people less familiar with Chinese culture.
Practical implications
The qualitative case study provides an advisable method for branding in Chinese. The results of this study can provide greater understanding of the various ideologies in cross‐strait markets, as well as help managers achieve global brand recognition.
Originality/value
The various ideologies from branding is complex, especially for those involved with linguistic essentials. Previous research has mainly focused on managerial‐based branding and customer‐based branding. This paper extends the interest into enlivening inspirations.
Details
Keywords
Vijay Ganji, Tahra ElObeid, Zumin Shi, Hiba Bawadi, Abdelhamid Kerkadi, Noor Moussa, Hoda Ali and Alshaimaa Sobeih
Prevalence of vitamin D insufficiency among young Qatari women is ∼85%. The purpose of the study was to develop a food frequency questionnaire (FFQ) and to assess the degree of…
Abstract
Purpose
Prevalence of vitamin D insufficiency among young Qatari women is ∼85%. The purpose of the study was to develop a food frequency questionnaire (FFQ) and to assess the degree of agreement between food vitamin D intakes derived from FFQ and 24-h food recall (24HFR) in young Qatari women.
Design/methodology/approach
A vitamin D-centric, 40-item FFQ was developed based on foods consumed in Qatar. In total, 36 Qatari women provided food intakes using FFQ and 24HFR. Vitamin D contents of foods reported in FFQ and 24HFR were computed. Spearman rank correlation was used to evaluate the relation between vitamin D intakes of FFQ and 24HFR. Bland–Altman (BA) plot and quartile comparisons were performed to determine the degree of agreement between food intakes of FFQ and 24HFR.
Findings
Median intakes of vitamin D from FFQ were significantly higher compared to the vitamin D content from 24HFR (213 IU vs 126 IU; p < 0.008). Vitamin D intakes were lower with 24HFR when compared with the intakes of FFQ. There was no significant relationship between food vitamin D intake from FFQ and 24HFR (Spearman rho = 0.16; p < 0.35). In cross classification, ∼64% were assigned to the same or adjacent quartiles. As per BA plot, more than 95% food intakes were within the limits of agreement (LOA) (BA index, 2.8%).
Originality/value
There was a moderate agreement between vitamin D intakes and FFQ and 24HFR. 24HFR should be used with caution in assessing the habitual food vitamin D intake because of limited sources of the vitamer in Qatari cuisine. The FFQ is suitable for estimating the food vitamin D intake in young Qatari women.
Details
Keywords
Muhammad Farrukh, Fanchen Meng and Ali Raza
A leader's job is not to put greatness into people, but rather to recognize that it already exists and to create an environment where that greatness can emerge and grow (Smith…
Abstract
Purpose
A leader's job is not to put greatness into people, but rather to recognize that it already exists and to create an environment where that greatness can emerge and grow (Smith, 2014). Based on Brad Smith's quote, the purpose of this study is to investigate the role of the leader's expectations, leader-member exchange (LMX) and organizational climate for innovation in fostering the intrapreneurial behavior (IB) of employees.
Design/methodology/approach
Data were collected from employees and their supervisors working across industries such as pharmaceutical, chemical, engineering and manufacturing. Collected data were then analyzed using the structural equation modeling technique.
Findings
The authors’ results show that LMX and leaders' expectations are positively linked to employees' IB. Moreover, this association is mediated by organizational climate.
Practical implications
This study's findings contribute to the literature on intrapreneurship and may also help practitioners formulate interventions to foster IB in organizations that will ultimately lead to higher performance.
Originality/value
This study attempted to investigate the effect of LMX and the Pygmalion effect on IB through employees' perception of organizational climate for innovation. The literature in this field is scarce and theoretical development is weak because traditional collaborative or participative leadership approaches are more relevant to an outcome than innovation.