Search results

This study aimed to characterize the concentrations of indoor pollutants (such as carbon dioxide (CO₂), ozone (O₃), nitrogen dioxide (NO₂) and sulfur dioxide (SO₂), as well as particulate matter (PM) (PM₁, PM_2.5 and PM₁₀) in Akure, Nigeria, as well as the relationship between the parameters’ concentrations.

The evaluation, which lasted four months, used a low-cost air sensor that was positioned two meters above the ground. All sensor procedures were correctly carried out.

CO₂ (430.34 ppm), NO₂ (93.31 ppb), O₃ (19.94 ppb), SO₂ (40.87 ppb), PM₁ (29.31 µg/m3), PM_2.5 (43.56 µg/m³), PM₁₀ (50.70 µg/m³), temperature (32.4°C) and relative humidity (50.53%) were the average values obtained. The Pearson correlation depicted the relationships between the pollutants and weather factors. With the exception of April, which had significant SO₂ (18%) and low PM₁₀ (49%) contributions, NO₂ and PM₁₀ were the most common pollutants in all of the months. The mean air quality index (AQI) for NO₂ indicated that the AQI was “moderate” (51–100). In contrast to SO₂, whose AQI ranged from “moderate” to “very unhealthy,” O₃'s AQI ranged from “good” (50) to “unhealthy” (151–200). Since PM₁, PM_2.5 and PM₁₀ made up the majority of PC1’s contribution, both PM_2.5 and PM₁₀ were deemed “hazardous.”

The practical implication of indoor air pollution is long-term health effects, including heart disease, lung cancer and respiratory diseases such as emphysema. Indoor air pollution can also cause long-term damage to people’s nerves, brain, kidneys, liver and other organs.

Lack of literature in terms of indoor air quality (IAQ) in Akure, Ondo State. With this work, the information obtained will assist all stakeholders in policy formulation and implementation. Again, the low-cost sensor used is new to this part of the world.

This paper presents economic and economic–statistical designs of the adaptive exponentially weighted moving average (AEWMA) control chart for monitoring the process mean. It also aims to compare the effect of estimated process parameters on the economic performance of three charts, which are Shewhart, exponentially weighted moving average and AEWMA control charts with economic–statistical design.

The optimal parameters of the control charts are obtained by applying the Lorenzen and Vance’s (1986) cost function. Comparisons between the economic–statistical and economic designs of the AEWMA control chart in terms of expected cost and statistical measures are performed. Also, comparisons are made between the economic performance of the three competing charts in terms of the average expected cost and standard deviation of expected cost.

This paper concludes that taking into account the economic factors and statistical properties in designing the AEWMA control chart leads to a slight increase in cost but in return the improvement in the statistical performance is substantial. In addition, under the estimated parameters case, the comparisons reveal that from the economic point of view the AEWMA chart is the most efficient chart when detecting shifts of different sizes.

The importance of the study stems from designing the AEWMA chart from both economic and statistical points of view because it has not been tackled before. In addition, this paper contributes to the literature by studying the effect of the estimated parameters on the performance of control charts with economic–statistical design.

This study investigates factors motivating upcycled food choices and assesses the association between these factors and hesitancy towards upcycled food consumption in a Swedish population.

An online food choice questionnaire was used. Participants (n = 682) were categorised into Inclined and Hesitant groups based on their intention to consume upcycled foods. The factors motivating upcycled food choices were identified using explanatory factor analyses. Independent t-tests assessed the differences in the mean importance score of factors between the two groups. The association between upcycled food choice factors and hesitancy towards consumption was evaluated by logistic regressions (adjusted for sociodemographic characteristics).

The most important upcycled food choice factor in both groups was ethical concerns, followed by natural content, sensory appeal, price, healthiness, familiarity and impression. The Inclined group’s mean importance score for ethical concern was higher than the Hesitant group (p_value<0.001) and, except for natural content, the mean importance scores for the other factors were higher in the Hesitant group compared to the Inclined group (p_value<0.05). Participants who perceived ethical concern as an important factor had lower odds of hesitancy (Odds ratio = 0.39; 95%CI:0.26,0.59; p_value<0.001), and those who considered sensory appeal an important factor had higher odds of hesitancy (Odds ratio = 2.42; 95%CI:1.62,3.63; p_value<0.001) towards upcycled food consumption compared to participants who did not consider these as important factors.

This is the first study investigating health and non-health-related upcycled food choice motives using a food choice questionnaire. Identifying these motives helps food developers and researchers determine factors influencing upcycled food consumption.

Motivated by recent rapid exchange rate depreciations, shrank economic growth, high inflation, and persistent trade deficits, this study examines the trade balance (TB) in the face of the recent dynamics of the stated macroeconomic factors, which are also important determinants of the TB. The symmetric test of the J-curve phenomenon for the selected Sub-Saharan African (SSA) countries is revisited in this regard. The study uses panel data from 1970 to 2020 for ten of these countries for the longitudinal panel analysis with the TB as the dependent variable and the real exchange rate, foreign and domestic national incomes, and trade openness as the set of independent variables.

Because the underlying data set involves a heterogeneous panel of relatively short N and long T, the pooled mean group (PMG) and mean group (MG) heterogeneous panel models are employed based on the Hausman test for parameter consistency in heterogeneous panels.

The findings largely support the domestic income growth– TB worsening and the foreign income growth– TB improvement hypotheses. Trade openness is found to mostly augment the TB performance of the countries. The results also validated the J-curve effect for only 3/10 and 2/10 countries in the PMG and MG models, respectively. The divergence for most of the countries is attributed to possible import compression and institutional structure of SSA countries.

Given the favorable effects of trade openness on the TB performance of SSA countries, it is recommended that SSA countries place much emphasis on import-substitution industrialization and value addition to their natural resources as well as investment-driven growth policies to improve the competitiveness of their exports and reverse the chronic deficits in their TBs.

This paper is unique for invoking heterogeneous panel models to analyze the TB in light of recent dynamics of its determinants, as well as providing an update on the symmetric test of the J-curve phenomenon for the selected SSA countries.

The purpose of this study is to examine the impact of using proportional representation system on the fragmentation of the party system in the Algerian political system within the period from 1997 to 2017, in which Algeria has experienced five legislative elections regularly every five years by testing a hypothesis about adopting the proportional representation system on the basis of the closed list during the foregoing legislative elections has obviously influenced the exacerbation of the Algerian party system’s fragmentation, compared to other factors.

The essence of the theoretical framework of this study is to address the effect of the electoral system as an independent variable on the party system as a dependent variable. The starting point for that framework is to reassess the “Duverger’s law,” which appeared since the early 1950s and has influenced the foregoing relationship, and then to review the literature on a new phase that tried to provide a more accurate mechanism for determining the number of parties and their relative weight, whether in terms of electoral votes or parliamentary seats. This means that researchers began to use a measure called the effective number of parties (ENP) for Laakso and Taagepera since 1979. The study elaborates the general concepts of the electoral system and the party system. It used Laakso, Taagepera index of the “ENP” to measure the phenomenon of fragmentation party during the five legislative elections from 1997 to 2017 in Algeria.

The results of the study reveal that the proportional representation electoral system – beside other factors – had clear impacts on the fragmentation of the Algerian party system by all standards, whether on the level of the apparent rise in the number of the parties represented in the Algerian parliament from 10 parties in 1997 election to 36 parties in 2017 election or according to the index of Laakso and Taagepera (ENP). The average number of effective number of electoral parties in the five elections was around 7.66, and the average number of effective number of parliamentary parties in the five elections was around 4.39, which puts Algeria in an advanced degree of the fragmentation of the party system.

This study about the phenomenon of the fragmentation of the party system, which is one of the new subjects in the field of comparative politics – globally and in the Arab world. Hence, the value of this study aims to shed light on this mysterious area of science, the fragmentation of the party system in the Algerian political system during the period from 1997 to 2017.

This paper aims to analyze the Egyptian revolution as an anti-systemic movement. It illustrates how Egypt’s position in the world-economy has affected its political economy orientation and led to the marginalization of critical masses, who launched the revolution.

The paper follows Wallerstein’s world-system analysis focusing on the anti-systemic movement concept. The paper analyzes the Egyptian case based on Annales school’s longue durée concept, which is a perspective to study developments of social relations historically.

The Egyptian revolution was not only against the autocratic regime but also against the power structure resulting from the neoliberal economic policies, introduced as a response to the capitalism crisis. It represented the voice of the forgotten. The revolution was one of the anti-systemic movements resisting the manifestations of the capitalist world-economy.

This paper aims at proving that the Egyptian revolution was an anti-systemic movement; which will continue to spread as a rejection to the world-system and to aspire a more democratic and egalitarian world. The current COVID-19 pandemic is exacerbating the crisis of the world-system.

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.

The retention and success of engineering undergraduates are increasing concern for higher-education institutions. The study of success determinants are initial steps in any remedial initiative targeted to enhance student success and prevent any immature withdrawals. This study provides a comprehensive approach toward the prediction of student academic performance through the lens of the knowledge, attitudes and behavioral skills (KAB) model. The purpose of this paper is to aim to improve the modeling accuracy of students’ performance by introducing two methodologies based on variable selection and dimensionality reduction.

The performance of the proposed methodologies was evaluated using a real data set of ten critical-to-success factors on both attitude and skill-related behaviors of 320 first-year students. The study used two models. In the first model, exploratory factor analysis is used. The second model uses regression model selection. Ridge regression is used as a second step in each model. The efficiency of each model is discussed in the Results section of this paper.

The two methods were powerful in providing small mean-squared errors and hence, in improving the prediction of student performance. The results show that the quality of both methods is sensitive to the size of the reduced model and to the magnitude of the penalization parameter.

First, the survey could have been conducted in two parts; students needed more time than expected to complete it. Second, if the study is to be carried out for second-year students, grades of general engineering courses can be included in the model for better estimation of students’ grade point averages. Third, the study only applies to first-year and second-year students because factors covered are those that are essential for students’ survival through the first few years of study.

The study proposes that vulnerable students could be identified as early as possible in the academic year. These students could be encouraged to engage more in their learning process. Carrying out such measurement at the beginning of the college year can provide professional and college administration with valuable insight on students perception of their own skills and attitudes toward engineering.

This study employs the KAB model as a comprehensive approach to the study of success predictors. The implementation of two new methodologies to improve the prediction accuracy of student success.