Marián Arias-Meza, Aldo Alvarez-Risco, Berdy Briggitte Cuya-Velásquez, Maria de las Mercedes Anderson-Seminario and Shyla Del-Aguila-Arcentales
The increase in population in the world has brought an overpopulation in various parts of the world, with those cities where their countries are developing being most affected…
Abstract
The increase in population in the world has brought an overpopulation in various parts of the world, with those cities where their countries are developing being most affected, mainly because these usually have corrupt governments that make urban planning difficult in an optimal way. The increase in the construction of urban areas generates problems in the environment due to the increase in carbon emissions, greenhouse gases, and the extraction of natural resources. Therefore, governments must promote urban innovation based on compliance with sustainable development that allows for preserving the ecosystem and the population's quality of life. Urban innovation must incorporate technologies that allow sustainable activities to be carried out efficiently and monitor the progress of environmental regulations.
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O.D. Makinde and M. Maserumule
The purpose of this paper is to investigate the inherent irreversibility and thermal stability in the flow of a variable viscosity fluid through a cylindrical pipe with convective…
Abstract
Purpose
The purpose of this paper is to investigate the inherent irreversibility and thermal stability in the flow of a variable viscosity fluid through a cylindrical pipe with convective cooling at the surface.
Design/methodology/approach
The non‐linear momentum and energy equations governing the flow are solved analytically using a perturbation method coupled with a special type of Hermite‐Padé approximation technique implemented numerically on MAPLE.
Findings
Expressions for dimensionless velocity and temperature, thermal criticality conditions and entropy generation number are obtained. A decrease in the fluid viscosity enhances both entropy generation rate and the dominant effect of heat transfer irreversibility near the wall
Originality/value
This paper presents the application of the second law of thermodynamics and a special type of Hermite‐Padé approximation technique to variable viscosity cylindrical pipe flow with convective cooling at the wall.
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Levent Ünlüsoy and Yavuz Yaman
The purpose of this paper is to analyse the effects of morphing on the aeroelastic behaviour of unmanned aerial vehicle (UAV) wings to make an emphasis on the required aeroelastic…
Abstract
Purpose
The purpose of this paper is to analyse the effects of morphing on the aeroelastic behaviour of unmanned aerial vehicle (UAV) wings to make an emphasis on the required aeroelastic tailoring starting from the conceptual design of the morphing mechanisms.
Design/methodology/approach
In this study, flutter and divergence characteristics of a fully morphing wing design were discussed to show the dilapidating effect of morphing on the related parameters. The morphing wings were intended to achieve a high efficiency at different flight phases; thus, various morphing concepts were integrated into a UAV wing structure. Although it is considered beneficial to have the morphing capabilities to avoid the failure due to a possible wear out in flutter and divergence parameters; it is necessary to include the aeroelastic analyses at the early design phases. This study utilizes a combination of a reduced order structural model and Theodorsen unsteady aerodynamic model as primary analyses tools for flutter and divergence. The analyses were conducted by using an in-house developed pk-algorithm coupled with a commercial finite element analysis (FEA) tool. This approach yielded a fast solution capacity because of the state-space form used.
Findings
Analyses conducted showed that transition between take-off, climb, cruise and loiter phases yield a change in the flutter and divergence speeds as high as 138 and 305 per cent, respectively.
Practical implications
The research showed that an extensive aeroelastic investigation was required for morphing wing designs to achieve a failure safe design.
Originality/value
The research intends to highlight the possible deteriorating effects on structural design of morphing UAV wings by focusing on the aeroelastic characteristics. In addition to that, fundamental morphing concepts are compared in terms of the order of magnitude of their deteriorating effects.
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Kazeem Oyedele Lamidi, Lusanda Beauty Juta and Vukosi Mathonsi
This paper aims to present relevant literature review to build up the case pertaining to the impact of traditional leadership in the demarcation of municipal boundaries in South…
Abstract
Purpose
This paper aims to present relevant literature review to build up the case pertaining to the impact of traditional leadership in the demarcation of municipal boundaries in South Africa. Municipal boundary demarcation remains a major contentious issue during the process of establishing municipalities. Little or no attention has been paid to the significance of traditional leadership in resolving issues around boundary demarcation between municipalities, hence this paper.
Design/methodology/approach
This paper adopted case study design. Data were collected from secondary sources and the contents were analyzed for this research purpose.
Findings
This paper put boundary in municipal context as a result of spatial reconfiguration process. It also discussed the impactful roles of traditional leadership as an institution involved in municipal (re)demarcation processes.
Research limitations/implications
This paper focusses on the contemporary roles that traditional leadership is at vantage position to play in the process of municipal boundary demarcation. Therefore, the paper concludes that traditional leadership could resolve issue of ethnicity as a causal factor mitigating the redemarcation of municipal boundaries.
Originality/value
It contributes to existing knowledge by providing information on the roles of traditional leadership that could complement the resolution of the ethnic complexities arising from municipal (re)demarcation processes.
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Marinko Skare, Beata Gavurova and Martin Rigelsky
The purpose of the research was to evaluate the relationship between income and the recycled materials used in order to rate the business related to circular repair services under…
Abstract
Purpose
The purpose of the research was to evaluate the relationship between income and the recycled materials used in order to rate the business related to circular repair services under the burden of economic development in the countries of the European Union.
Design/methodology/approach
The analytical processes explore data from 2010 to 2020. The countries were divided into clusters according to economic maturity (Human Development Index (HDI), real Gross domestic product (GDP) per capita). Subsequently, the relationships were evaluated through the income indicators (for the 13 population groups), and the circular materials use rate indicator. The three indicators decomposed into five specific metrics were employed. The commonly applied characteristics of the descriptive analysis, Pearson's correlation coefficient and the panel regression analysis were engaged in the investigation.
Findings
The results demonstrated the vast disparities between income and circular materials use. In the more economically developed countries, their levels were twice higher as the less-developed countries. However, there is a meaningful positive relationship between them. The greatest attention was paid to the panel regression analysis applied to the relationship between income and circular economy (CE) use. The results showed that in a majority of the cases (different income categories), there is a significant positive relationship. When comparing the outcomes of the regression models between the groups of the countries according to their economic development, a closer relationship was clearly demonstrated in the countries with a lower level of development (Bulgaria, Romania, Croatia, Hungary).
Research limitations/implications
Besides the specific strengths, the study also shows some limitations identified mainly on the data side. The latest data on the consumption of circular materials come from 2020, so they do not cover the period related to the pandemic crisis. It is believed that there may have been some changes in income during the pandemic, and they may have harmed CE. Furthermore, there is to note that some limitations occur in the analytical process. The incompleteness of the data can also be included here as certain data is not available; hence, it was estimated directly by the Eurostat statistical authority.
Practical implications
At the same time, the following are currently considered among the primary barriers: financial restrictions, insufficient infrastructure, weak government support and obstacles on the global market. Consumers, industry leaders and the government are the most influential stakeholder groups in overcoming barriers. Higher demand for repair services will also initiate further development of business activities in this area at various regional levels. Progress in the repair services economy will continue to require extensive efforts in the future. Systematic coordination of activities at multiple levels of government together with manufacturers, designers, educational institutions, community institutions and individuals will be essential.
Social implications
Socioeconomic characteristics such as sex, age and education represent crucial predictors of consumer behavior. Therefore, the authors would like to focus future research on analyzing these characteristics and examine all the conceptual frameworks of consumer behavior and its positioning in detail within CE and the strategies related to the repair service. Discussing this issue through follow-up research will allow for solving complex transformational and political tasks related to the repair service strategies within CE. It will also inspire the discussion frameworks and multidisciplinary solutions to this issue affecting the fields of human geography, sociological, ethnographic and political sciences.
Originality/value
In less-developed countries, wage change can have a more substantial impact on the development of the CE. Also, a closer relationship between business in the field of repair services with income and the use of circular materials was manifested in the same way.