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The purpose of the paper is to showcase the significant achievements of Egypt's scientists in the 20th century across various fields of study such as medicine, physics, chemistry, biology, math, geology, astronomy and engineering. The paper highlights the struggles and successes of these scientists, as well as the cultural, social and political factors that influenced their lives and work. The aim is to inspire young people to pursue careers in science and make their own contributions to society by presenting these scientists as role models for hard work and dedication. Ultimately, the paper seeks to promote the importance of science and its impact on society.

The purpose of this review is to present the scientific biographies of Egypt's most distinguished scientists, primarily in the field of Natural Sciences, in a balanced and comprehensive manner. The work is objective, honest and abstract, avoiding any bias or exaggeration. The author provides a clear and concise methodology, including a brief introduction to the scientist and their field of study, an explanation of their major contributions, the impact of their work on society, any challenges or obstacles faced during their career and their lasting legacy. The aim is to showcase the important achievements of these scientists, their impact on their respective fields and to inspire future generations to pursue scientific careers.

The group of outstanding scientists in 20th century Egypt were shaped by various factors, including familial upbringing, education, society, political and cultural atmosphere and state support for scientific research. These scientists made significant contributions to various academic disciplines, including medicine, physics, chemistry, biology, mathematics and engineering. Their impact on their communities and cultures has received international acclaim, making them role models for future generations of scientists and researchers. The history of these scientists highlights the importance of educational investments and supporting scientific research to foster innovation and social progress. The encyclopedia serves as a useful tool for students, instructors and education professionals, preserving Egypt's scientific heritage and honouring the scientists' outstanding accomplishments.

The encyclopedia preserves Egypt's scientific heritage, which has been overlooked for political or other reasons. It is a useful tool for a variety of readers, including students, instructors and education professionals, and it offers insights into universally relevant scientific success factors as well as scientific research methodologies. The encyclopedia honours the outstanding scientific accomplishments of Egyptian researchers and their contributions to the world's scientific community.

The practical implications of this paper are several. First, it highlights the importance of education, family upbringing and societal support for scientific research in fostering innovation and social progress. Second, it underscores the need for continued funding and support for scientific research to maintain and build upon the accomplishments of past generations of scientists. Third, it encourages young people to pursue scientific careers and make their own contributions to society. Fourth, it preserves the scientific heritage of Egypt and honors the contributions of its outstanding scientists. Finally, it serves as a useful tool for students, instructors and education professionals seeking to understand the factors underlying scientific success and research methodologies.

The social implications of the paper include promoting national pride and cultural identity, raising awareness of the importance of education and scientific research in driving social progress, inspiring future generations of scientists and researchers, reducing socioeconomic disparities and emphasizing the role of society, politics and culture in shaping scientific researchers' personalities and interests.

The paper's originality/value lies in its comprehensive documentation of the scientific biographies of Egypt's most prominent scientists in the 20th century, providing unique insights into the factors that contributed to their development and their impact across various academic disciplines. It preserves Egypt's scientific heritage and inspires future generations of scientists and researchers through the promotion of educational investments and scientific research. The encyclopedia serves as a useful tool for education professionals seeking to understand scientific success factors and research methodologies, emphasizing the importance of supportive and inclusive environments for scientific development.

Sustainability development goals (SDGs) cannot be achieved without a concerted effort from businesses and other organisations, being the corporate level is one of the keys to the achievement of SDGs. This study aims to explore the relationship between firms' adoption of SDG reporting in China and two main corporate-level factors, namely, board characteristics and ownership factors. Also, this study aims to determine which set of drivers – those related to board or ownership factors – exerts a greater influence on this reporting.

This research examines the impact of ownership and board-level factors on the SDG reporting of Chinese firms in the period 2016–2018, with a final sample of 455 firm-year observations operating in 11 activity sectors.

The results support the following: firstly, that board independence and size and the existence of a corporate social responsibility (CSR) committee favours firms addressing SDGs in their sustainability reporting while greater levels of foreign or institutional ownership are negatively related to a company's adoption of SDG reporting; secondly, two-stage logit regression results revealed that board-level factors exert greater explanatory power in the prediction of this reporting and have bigger weights in affecting the SDGs reporting.

This study focuses on assessing the drivers of SDGs; namely, what internal factors will facilitate companies' better implementation of SDG reporting to bridge the gap in this field, not only extending the investigation of corporate governance factors affecting SDGs but also examining the impact of corporate ownership on SDG reporting.

This study enriches and provides support for previous studies examining the drivers of SDGs in the private sector. In academia, addressing SDGs in business is still an emerging research stream that is still in an embryonic state; the reporting of SDGs in business is quite under-investigated in the sustainability literature. Moreover, literature on the drivers that promote better implementation of SDGs in business is even more scarce and incomplete. Some previous studies have ignored the impact of board size and the CSR committee. At the same time, there is no research to date on the impact of ownership on companies' SDGs reporting, which has been proved to play a large role in firms sustainability reporting.

This research paper aims to examine the influence of greater female participation on the board of directors on the environmental transparency of companies.

To achieve the purpose of this study, the authors analyzed the environmental transparency of 412 companies in the energy sector, headquartered in 19 countries, during a four-year period (2016 to 2019).

The data reveal that gender diversity has a positive effect on the environmental transparency of companies in developed countries and on the total model. Furthermore, after removing the US companies, the results remained the same, indicating that companies with more women on the board tend to have greater environmental transparency. Regarding corporate governance variables, the results show that companies that have a corporate social responsibility committee tend to have greater environmental transparency, both in emerging countries and in developed countries.

The findings indicate that if companies aim to have greater environmental transparency, they must encourage female participation on boards, giving them equal opportunities for professional growth. Organizations must deconstruct the ideology that women are fewer valuable members of their boards, which limits their contribution to organizational success. Additionally, regulators can encourage greater female participation on boards through the implementation of quota laws.

The authors’ evidence indicates that the presence of women on board is an antecedent of greater quality in the dissemination of environmental information. Thus, managers of companies in the energy sector must understand that diversity on the board affects communication with its stakeholders through environmental transparency.

The purpose of this study is to examine how well reinforced concrete structures can be shielded against concrete carbonation using anti-carbonation coatings based on synthetic polymer.

Applying free radical polymerization, an acrylate terpolymer emulsion that a surfactant had stabilized was created. A thermogravimetric analysis, minimum film-forming temperature, Fourier transform infrared spectroscopy and particle size distribution are used to characterize the prepared eco-friendly water base acrylate terpolymer emulsion. Using three different percentages of the acrylate terpolymer emulsion produced, 35%, 45% and 55%, the anti-carbonation coating was formed. Tensile strength, tensile strain, elongation, crack-bridging ability, carbon dioxide permeability, chloride ion diffusion, average pull-off adhesion strength, water vapor transmission, gloss, wet scrub resistance, QUV/weathering and storage stability are the characteristics of the anti-carbonation coating.

The formulated acrylate terpolymer emulsion enhances anti-carbonation coating performance in CO₂ permeability, Cl-diffusion, crack bridging, pull-off adhesion strength and water vapor transmission. The formed coating based on the formulated acrylate terpolymer emulsion performed better than its commercial counterpart.

To protect the steel embedded in concrete from corrosion and increase the life span of concrete, the surface of cement is treated with an anti-carbonation coating based on synthetic acrylate terpolymer emulsion.

In addition to saving lives from building collapse, it maintains the infrastructure for the long run.

The anti-carbonation coating, which is based on the synthetic acrylate terpolymer emulsion, is environmentally benign and stops the entry of carbon dioxide and chlorides, which are the main causes of steel corrosion in concrete.

Hospitality businesses are changing digitally to meet customer demands, provide value and stay competitive. Prior hospitality studies examined customers’ technology acceptance rather than digital technology readiness and acceptance. In addition, no studies have explored how restaurant customers’ digital transformation influences hedonic and utilitarian values and customer well-being. Therefore, this study aims to examine how fast-food restaurant customers’ digital transformation (i.e. technical readiness and acceptance) influences their perceived value and well-being.

This study provides a conceptual framework with six constructs. The data for this study were collected from fast-food restaurant customers in Egypt using a self-administered questionnaire.

According to the findings, customers’ technical readiness for digital transformation in fast-food restaurants substantially impacts their technology acceptance. In addition, customers’ perceived hedonic and utilitarian values are greatly influenced by their acceptance of fast-food restaurant digital technologies, and these perceived values significantly impact customer well-being.

This study presents several suggestions to improve customers’ readiness for digital transformation in fast-food restaurants and the impact on their technology acceptance and perceived value and well-being. Also, this study’s results could impact fast-food restaurants’ decisions to adopt new digital technologies (e.g. service robots) for their customers.

The study adds to the existing literature review by attempting to present a comprehensive picture of fast-food restaurant customers’ digital transformation (i.e. technical readiness and acceptance) and its impact on customers’ perceived values. A potential antecedent of fast-food restaurant customers’ well-being was also investigated: perceived hedonic and utilitarian values.

酒店业正在数字化转型, 以满足顾客需求、提供价值并保持竞争力。之前的酒店业研究主要关注顾客对技术的接受程度, 而不是数字技术准备和接受程度。此外, 没有研究探讨餐厅顾客的数字化转型如何影响享乐和功利价值以及顾客的幸福感。因此, 本研究旨在探讨快餐餐厅顾客的数字化转型（技术准备和接受程度）如何影响他们的感知价值和幸福感。

本研究提供了一个概念框架, 包括六个构面。本研究的数据通过自行填写问卷的方式从埃及的快餐餐厅顾客中收集。

根据研究结果, 快餐餐厅顾客的数字化转型技术准备程度显著影响其对数字技术的接受程度。此外, 快餐餐厅顾客对数字技术的接受程度极大地影响他们对享乐和功利价值的感知, 并且这些感知价值对顾客的幸福感产生显著影响。

本研究试图呈现出一个全面的快餐餐厅顾客的数字化转型（技术准备和接受程度）对顾客感知价值的影响机制。同时, 本研究还调查了快餐餐厅顾客幸福感的潜在前因：感知的享乐和功利价值。

本研究提出了一些建议, 以提高快餐餐厅顾客对数字化转型的准备程度, 并对他们的技术接受程度、感知价值和幸福感产生影响。此外, 本研究的结果会影响快餐餐厅采用新的数字技术（例如服务机器人）来为顾客提供服务的决策。

In this study, the authors examine the push and pull effects of extreme weather events on migration among governorates in Egypt.

To estimate the effect of extreme weather events on internal migration, the authors use migration gravity models and data from the 1996 and 2006 Population and Housing Censuses. The authors measure weather extremes by the number of months in the past 36 months with temperatures or precipitation of a governorate below the 5th percentile and above the 95th percentile of the distribution of monthly temperatures or precipitation of the corresponding governorate during the period 1900–2006.

This study’s results suggest that high temperatures in the origin area act as a push factor. High-temperature extremes have a positive effect on out-migration. A 1% increase in the number of months with high-temperature extremes in the original governorate results in a 0.1% increase in the number of out-migrants.

The study suggests that people may respond to weather extremes through migration. However, climate migrants in Egypt may encounter several significant risks that authorities must address.

This study is one of the first attempts to measure the push and pull effect of weather extremes on migration in Egypt.

This study aims to extend the pot life without altering the qualities and performance of the coating, which is important to increase when manufacturing polyurethane coatings.

An acrylic polyol from a mixture of different monomers of hydroxypropyl methacrylate, methacrylic acid, 2-ethylhexyl acrylate, methyl methacrylate and n-butyl methacrylate was prepared with different ratios of 2,4-pentanedione as a pot life extender. The reaction takes place in presence of di-tert-butyl peroxide as initiator with samples (T1–T7). The physical properties of prepared acrylic polyol were characterized. Then, coating polyurethane varnish was prepared from the prepared acrylic polyol with an aliphatic polyisocyanate in a 1:1 equivalent ratio of OH:NCO at room temperature, in presence of paint thinner (diluents/solvent) and dibutyltin dilaurate as a catalyst to give samples (T1C–T7C). This coating was evaluated via Fourier-transform infrared spectroscopy, drying time, hardness and gloss, distinctness of image and reflected image quality.

The coating has a prolonged pot life while still maintaining the other qualities, thanks to the greater 2,4-pentanedione content.

It is desired to have a paint which has a satisfactory pot life, short curing time and reduces many drawbacks such as inefficient working and deterioration of the paint before application.

Data protection requirements heavily increased due to the rising awareness of data security, legal requirements and technological developments. Today, NoSQL databases are increasingly used in security-critical domains. Current survey works on databases and data security only consider authorization and access control in a very general way and do not regard most of today’s sophisticated requirements. Accordingly, the purpose of this paper is to discuss authorization and access control for relational and NoSQL database models in detail with respect to requirements and current state of the art.

This paper follows a systematic literature review approach to study authorization and access control for different database models. Starting with a research on survey works on authorization and access control in databases, the study continues with the identification and definition of advanced authorization and access control requirements, which are generally applicable to any database model. This paper then discusses and compares current database models based on these requirements.

As no survey works consider requirements for authorization and access control in different database models so far, the authors define their requirements. Furthermore, the authors discuss the current state of the art for the relational, key-value, column-oriented, document-based and graph database models in comparison to the defined requirements.

This paper focuses on authorization and access control for various database models, not concrete products. This paper identifies today’s sophisticated – yet general – requirements from the literature and compares them with research results and access control features of current products for the relational and NoSQL database models.

Scholars and professionals are interested in studying customer value in fast-food restaurants. Previous research on the customer value of fast-food restaurants mainly measured the dimensions and relationships of the customer value. However, the research has not examined a method for identifying sources of customer value in fast-food restaurants. Therefore, this study used customer orientation to find customer needs and generate customer value in fast-food restaurants.

This study presents a conceptual framework with six constructs. A questionnaire was used to gather empirical data from fast-food restaurant customers in Greater Cairo, Egypt. The suggested framework was evaluated using confirmatory factor analysis, reliability and validity analysis, standardized path coefficients and regression-based moderation analysis.

This study found that proactive customer orientation has a substantial direct and positive impact on customer perceived value. Customer perceived value is also positively influenced by responsive and proactive customer orientations, with customer desired value change intensity acting as a moderator. Customer perceived value substantially impacts customer satisfaction, and the latter substantially affects behavioural intention.

This study offers several suggestions for managers of fast-food restaurants on how to employ customer orientation to find current, latent and future customer desires to provide customer value.

This is the first research in the hospitality industry to demonstrate how responsive and proactive customer orientation may be used to recognize customer needs and provide the desired customer value.

This study aims to conceptualize and investigate the relationships between halal entrepreneurial success, innovation capability and sustainable innovation in the halal industry.

Both integrative and generative approaches are combined to move forward from the literature to a theoretical contribution. The paper presents a model that relates halal entrepreneurial success to innovation capability and sustainable innovation. A purposive sample of 340 Malaysian halal entrepreneurs is used to test the conceptualized model. The partial least square technique was then used to assess the structural model.

The results disclosed that halal entrepreneurial success is positively related to both innovation capability and sustainable innovation. Also, the innovation capability mediates the relationship between halal entrepreneurial success and sustainable innovation.

This research conceptualized and examined a novel model that assesses the relationships between halal entrepreneurial success, innovation capability and sustainable innovation in the halal industry.