Estimation of the virtual masses of a large unconventional airship based on purely analytical method to aid in the preliminary design

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Said Chaabani ◽  
Naoufel Azouz
Keyword(s):  
Analytical Method ◽  
Degrees Of Freedom ◽  
Analytical Methodology ◽  
Content Type ◽  
Complex Functions ◽  
Added Masses ◽  
System Equations ◽  
New Generation ◽  
Practical Implications

Purpose This paper presents preliminary results of the modeling of a large autonomous quad-rotor airship, with flying wing shape. This airship is supposed to be a flexible body. This study promotes an entirely analytical methodology with some assumptions. In this study and as first assumption, the shape of the careen is supposed to be an elliptic cone. To retrieve the velocity potential shapes, this paper solved the Laplace’s equation by using the sphero-conal coordinates. This leads to the Lamé’s equations. The whole system equations governing the interaction of air–structure, including the boundary conditions, is solved in an analytical setting. Design/methodology/approach This paper opted for a modeling and determination of the added masses of a flexible airship by an analytical method illustrated by a comparison with a geometric method. This analytical method includes the study of complex functions which are the Lamé functions. Findings This paper provides an analytical way to estimate an aerodynamic phenomenon which acts on the airship and in particular on its envelope and known as the phenomenon of added masses or virtual masses, as well as the means of defining it and the calculation analytically for the case of the flexible airship. Research limitations/implications Considering that the calculation of the added masses is very difficult and the numerical methods increase the number of degrees of freedom, the analytical method established in this paper has become a solution of calculations of these virtual masses. Practical implications This paper includes an application for determining the added masses of a new generation MC500 airship. Originality/value This paper allows defining an analytical method which determines the added masses of an airship, which helps the automation engineer to develop a control strategy to stabilize this airship.

A quantitative investigation of the effects of new generation vs traditional upper secondary schools in Cambodia through the lens of STEM transfer model

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sovansophal Kao
Keyword(s):  
Secondary Schools ◽  
Attitudes Toward Science ◽  
Content Type ◽  
Math Teachers ◽  
Upper Secondary ◽  
New Form ◽  
K 12 ◽  
New Generation ◽  
Upper Secondary Schools ◽  
Practical Implications

PurposeThis study aimed to examine the effects of Cambodia's New Generation Schools (NGS), as compared to their traditional counterparts, in enhancing the seven constructs: (1) science and math achievement, (2) science and math self-efficacy, (3) science and math outcome expectations, (4) attitudes toward science, (5) interactive science and math lessons, (6) support from science and math teachers and (7) encouragement and support in science from family.Design/methodology/approachThe two observations data was collected using self-rated questionnaire from 301 11th graders from five upper secondary schools located in three provinces of Cambodia. Independent sample t-test, Analysis of Covariance (ANCOVA) and dependent sample t-test were used to analyze the repeated measures data.FindingsThe study revealed that students from the NGS exhibited statistically higher scores for most constructs, especially for attitudes toward science. However, when controlling for the differences in the first observation data, the significant effects of the three constructs have been neutralized. Moreover, though there was an increase in science activities outside school, there was a negative trajectory in the other two sub-constructs of attitudes toward science and support from science and math teachers, both in NGS and traditional schools.Practical implicationsThese findings point some practical implications for enhancing the effectiveness of the two school types and further research.Originality/valueThere is heavy investment in new form of schools across the world to enhance students' learning and academic achievement in science and math in K-12 and to promote their interest in STEM in higher education. However, there is little document on the effectiveness of this new form of school, particularly in the Cambodian context.

scholarly journals Foresight in cities: on the possibility of a “strategic urban intelligence”

foresight ◽  
2016 ◽  
Vol 18 (5) ◽  
pp. 469-490 ◽  
Author(s):  
Joe Ravetz ◽  
Ian Douglas Miles
Keyword(s):  
Complex Systems ◽  
Analytical Method ◽  
Design Methodology ◽  
Content Type ◽  
Work In Progress ◽  
Strategic Policy ◽  
The Uk ◽  
The City ◽  
Practical Implications ◽  
Practical Recommendations

Purpose This paper aims to review the challenges of urban foresight via an analytical method: apply this to the city demonstrations on the UK Foresight Future of Cities: and explore the implications for ways forward. Design/methodology/approach The methodology is based on the principles of co-evolutionary complex systems, a newly developed toolkit of “synergistic mapping and design”, and its application in a “synergy foresight” method. Findings The UK Foresight Future of Cities is work in progress, but some early lessons are emerging – the need for transparency in foresight method – and the wider context of strategic policy intelligence. Practical implications The paper has practical recommendations, and a set of propositions, (under active discussion in 2015), which are based on the analysis. Originality/value The paper aims to demonstrate an application of “synergy foresight” with wide benefits for cities and the communities within them.

Causality in qualitative market and social research

2019 ◽  
Vol 22 (3) ◽  
pp. 405-413
Author(s):  
Clive Roland Boddy
Keyword(s):  
Qualitative Research ◽  
Design Methodology ◽  
Social Research ◽  
Pragmatic Approach ◽  
Social Phenomena ◽  
Content Type ◽  
The Past ◽  
The Moment ◽  
Practical Implications

Purpose Academic qualitative researchers have been criticized for rejecting the idea that their research can establish causality while market and social researchers, with their realist and pragmatic approach to research, take for granted that it can. This paper aims to explore the ability of qualitative research to determine cause and effect in terms of market and social phenomena. Design/methodology/approach The literature on causality in qualitative research is reviewed and discussed. The discussion is further informed by the author’s own experience of undertaking commercial and academic market and social qualitative research over the past 33 years. Findings In qualitative market and social research, the determination of causality is often needed but rarely discussed. This paper explores this occurrence and brings to the fore, via discussion and the use of example, the ways in which causality can be determined by qualitative research. Practical implications A determination of what events bring about predictable changes in social and market environments can be established via qualitative research particularly at a probabilistic level of causality. This implies that policymakers should give a greater emphasis to qualitative findings than then sometimes do at the moment. Originality/value Causality in market and social research is rarely discussed by practitioners but is nevertheless a premise of much of the qualitative research that is undertaken. This paper is therefore distinctive in that it examines whether this premise is justifiable.

Generation Z entering the workforce: the need for sustainable strategies in maximizing their talent

2018 ◽  
Vol 26 (4) ◽  
pp. 34-38 ◽  
Author(s):  
Bharat Chillakuri ◽  
Rajendra Mahanandia
Keyword(s):  
Design Methodology ◽  
Journal Articles ◽  
Content Type ◽  
Entry Level ◽  
Cohort Group ◽  
Generation Z ◽  
Efficiency And Effectiveness ◽  
New Generation ◽  
Practical Implications ◽  
Research Analysis

PurposeThe purpose of this paper is to understand the characteristics of the cohort Generation Z and identify strategies for maximizing their talent. The study emphasizes that it is critical for the organization to revisit their strategies so as to accommodate this cohort group. With Generation Z entering the workforce, the nature of entry-level jobs is changing; hence, HR needs to redesign their strategies to attract and engage Generation Z.Design/methodology/approachThe research design adopted for the study is exploratory in nature. The research analysis is based on the information/data collected from the journal articles, newspapers and various conferences and majorly from in-person discussions with the Generation Z cohort group.FindingsGeneration Z believes in multitasking and likes to learn everything on their own, underscoring their individuality. They believe in doing more in less time, and thus, efficiency and effectiveness are attributed to be part of their DNA.Research limitations/implicationsIt has to be accepted that very little is known about Generation Z as they have just started to enter the workforce. The next two years will have this cohort joining organizations in entry-level jobs. Organizations have to carefully watch and redesign their strategies to effectively engage this group, as they have no choice except to accept the new generation.Practical implicationsThe literature on Generation Z is scanty, as much of the scholarly research is done in isolation. However, prior studies indicate that Generation Z is tech-savvy and wants everything connected. Organizations will be forced to accept technology as the preferred medium of communication when Generation Z enters the organization.Originality/valueThe study presents an alternative for managing the Generation Z, thereby maximizing their talent in the workplace.

Combating corruption in Nigeria and the constitutional issues arising

2016 ◽  
Vol 23 (4) ◽  
pp. 700-724 ◽  
Author(s):  
Akume T. Albert
Keyword(s):  
Analytical Method ◽  
Design Methodology ◽  
Original Work ◽  
Social Implications ◽  
Plea Bargain ◽  
Content Type ◽  
Documentary Sources ◽  
The Law ◽  
The Government ◽  
Practical Implications

Purpose The purpose of this paper therefore is to identify and examine major issue-areas in law, prominent among which are the Plea-Bargain and S308 Immunity Clause, and how they impact the process of effectively combating corruption in Nigeria. Design/methodology/approach The paper uses documentary sources and analytical method to examine the issues involved. Findings The identified issue-areas are inhibitors rather than facilitators. Research limitations/implications The implication is that the government needs to change the existing laws to strengthen the fight against corruption. Practical implications This is to ensure that the war against corruption is strengthened and effective. Social implications To ensure that offenders face the full weight of the law for their action. Originality/value This paper is the author's original work and all references are appropriately acknowledged.

scholarly journals The denial of limits and interior aspects of descent

foresight ◽  
2014 ◽  
Vol 16 (6) ◽  
pp. 527-549 ◽  
Author(s):  
Richard A. Slaughter
Keyword(s):  
Real World ◽  
Social Implications ◽  
It Infrastructure ◽  
Content Type ◽  
Limits To Growth ◽  
The Social ◽  
Economic Indices ◽  
New Generation ◽  
Start Ups ◽  
Practical Implications

Purpose – The purposes of this paper are as follows. Part one examines the role of denialism in the context of proposals advanced through the much-abused Limits to Growth (LtG) project. Part two uses three sets of criteria (domains of reality, worldviews and values) to characterise some of the interior human and social aspects of the “denial machine.” It uses these criteria to address some vital, but currently under-appreciated “interior” aspects of descent. (N.B. A succinct “primer” or overview of the concept and underpinning rationale for notions of “descent pathways” is provided in the introduction to this special issue.) Design/methodology/approach – The paper draws on a number of authoritative sources that track the dimensions of global change and, specifically, the ways that humanity is tracking towards Dystopian overshoot-and-collapse futures. The significance of the LtG project is assessed in this context. Part two employs the criteria noted above to identify and open out the centrality of the human and cultural interiors. Findings – Responses to the LtG project are shown to have deprived humanity of the clarity and will to respond effectively to the emerging global emergency. The rise of climate change denialism has followed suit and made effective responses increasingly difficult. A new focus, however, on some of the dynamics of reality domains, worldviews and values, clarifies both the nature of the problem and prefigures a range of solutions, some of which are briefly outlined. Research limitations/implications – This is primarily a conceptual paper that suggests a range of practical responses. For example, re-purposing parts of the current information technology (IT) infrastructure away from financial and economic indices to those tracking the health of the planet. Also translating the case put forward here for a new generation of Institutions of Foresight (IoFs) into real-world start-ups and examples. Further research is needed into the uses and limitations both of positive and negative views of futures. It is suggested that the latter have more value than is commonly realised. Practical implications – In addition to those stated above, the practical implications include new uses for IT infrastructure based on worldcentric – rather than financial and economic worldviews; designing and implementing a new generation of IoFs; and finding new ways to inform the public of impending Dystopian outcomes without exacerbating avoidance and depression. Social implications – The social implications are profound. Currently, humanity has allowed itself to “tune out” and ignore many of the well-founded “signals” (from the global system) and warnings (from those who have observed and tracked real-world changes). As a result, it has outgrown the capacity of the planet to support the current population, let alone the 10 billion currently projected by the United Nations (UN). Something must give. Applied foresight can provide essential lead time to act before human actions are overwhelmed by forces beyond its control. Originality/value – The paper draws together material from hitherto disparate sources to assess the LtG project. It also deploys key concepts from an integral perspective that shed new light on human and cultural forces that determine how people respond to the prospect of Dystopian futures. In so doing, it provides insight into why we are where we are and also into some of the means by which humanity can respond. Specifically, it suggests a shift from collapse narratives to those of descent.

Profit-sharing investment accounts in islamic banks or mutualization, accounting perspective

2016 ◽  
Vol 14 (1) ◽  
pp. 30-48 ◽  
Author(s):  
Wasim K. AlShattarat ◽  
Muhannad A. Atmeh
Keyword(s):  
Financial Reporting ◽  
Mutual Fund ◽  
Design Methodology ◽  
Profit Sharing ◽  
Islamic Banks ◽  
Content Type ◽  
Implementation Challenges ◽  
Total Profit ◽  
Practical Implications

Purpose Islamic banks use Mudarabah contract to replace the interest-bearing deposits with profit-sharing investment accounts. The purpose of this paper is to explore the challenges and problems associated with the employment of Mudarabah contract by Islamic banks. Design/methodology/approach The study critically analyzes the Mudarabah contract used by Islamic banks. It reviews the evolution of the contract from its traditional type to more complicated types such as compound, unrestricted, commingled and continuous Mudarabah. The paper investigates the problems that have emerged from implementing such types in current business settings. Findings The paper proves that implementing the Mudarabah contract by banks imposes several problems among which are the following: difficulty in the determination of total profit resulting from Mudarabah and in allocating this profit to the multiple parties involved in Mudarabah; usage of reserves to cater against future losses may undermine the concept of Mudarabah profit-loss sharing and lead to earnings management; corporate governance is also a major problem in Mudarabah contract, as the depositors are exposed to risks but have no governance rights; and Mudarabah may also lessen the fair presentation of financial reporting. Research limitations/implications The paper examines the evolving Mudarabah contract and its implementation challenges, based on available literature (no empirical analysis was conducted). Practical implications The implications are significant for the future development of Islamic contracts and Islamic accounting treatments. Originality/value Many studies explored the Mudarabah contract from a Shariah or law perspective. However, this paper investigates the Mudarabah contract with a focus on the implication on accounting and financial reporting because of the lack of studies in this area. Furthermore, it demonstrates the persistent flaws in the Mudarabah contract, and it proposes a new model for mobilizing funds, i.e. mutual fund.

Evaluation of residual clearance after pre-joining and pre-joining scheme optimization in aircraft panel assembly

2016 ◽  
Vol 36 (4) ◽  
pp. 376-387 ◽  
Author(s):  
Di Yang ◽  
Weiwei Qu ◽  
Yinglin Ke
Keyword(s):  
Pareto Optimality ◽  
Design Methodology ◽  
Elastic Behavior ◽  
Assembly Model ◽  
Content Type ◽  
Scheme Optimization ◽  
Constrained Variation ◽  
Practical Implications ◽  
Excessive Number

Purpose For the automatic drilling and riveting in panel assembly, gaps between the skin and strangers are inevitable and undesirable. At present, the determination of pre-joining schemes relies on workers’ experience, introducing excessive number and inappropriate locations of pre-joining. This paper aims to present a new method for the evaluation of residual clearances after pre-joining and the pre-joining scheme optimization, providing operation guidance for the workers in panel assembly workshop. Design/methodology/approach In this paper, an equivalent gap assembly model for pre-joining is proposed on the basis of the mechanism of variation. This model retains the essential elastic behavior of the key features during the pre-joining operation and calculates the residual clearances in the view of the potential energy. Subsequently, this method is embedded into a Pareto optimality-based genetic algorithm, and the optimal pre-joining schemes are achieved with the consideration of the total residual clearances and the permissive tolerances. Findings The equivalent gap assembly model has the capability to predict an acceptable degree of accuracy of the residual clearances and achieve the optimized pre-joining schemes with less number of pre-joining at the same level of residual clearances. Practical implications The optimized pre-joining schemes are given in the form of Pareto optimality set, and workers can select suitable results according to their inclination to the quality and efficiency. Originality/value The paper is the first to propose the equivalent gap assembly model for the pre-joining operation, which provides for the simplification of the calculation of residual clearances based on the constrained variation principles.

New (3+1)-dimensional integrable fourth-order nonlinear equation: lumps and multiple soliton solutions

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Abdul-Majid Wazwaz
Keyword(s):  
Fourth Order ◽  
Soliton Solutions ◽  
Integrable Equation ◽  
Lump Solutions ◽  
Content Type ◽  
Multiple Soliton Solutions ◽  
Order Nonlinear Equation ◽  
New Equation ◽  
Practical Implications

Purpose This paper aims to introduce a new (3 + 1)-dimensional fourth-order integrable equation characterized by second-order derivative in time t. The new equation models both right- and left-going waves in a like manner to the Boussinesq equation. Design/methodology/approach This formally uses the simplified Hirota’s method and lump schemes for determining multiple soliton solutions and lump solutions, which are rationally localized in all directions in space. Findings This paper confirms the complete integrability of the newly developed (3 + 1)-dimensional model in the Painevé sense. Research limitations/implications This paper addresses the integrability features of this model via using the Painlevé analysis. Practical implications This paper presents a variety of lump solutions via using a variety of numerical values of the included parameters. Social implications This work formally furnishes useful algorithms for extending integrable equations and for the determination of lump solutions. Originality/value To the best of the author’s knowledge, this paper introduces an original work with newly developed integrable equation and shows useful findings of solitons and lump solutions.

scholarly journals How to scope configuration projects and manage the knowledge they require

2018 ◽  
Vol 22 (5) ◽  
pp. 982-1014 ◽  
Author(s):  
Sara Shafiee ◽  
Katrin Kristjansdottir ◽  
Lars Hvam ◽  
Cipriano Forza
Keyword(s):  
Participant Observation ◽  
Content Type ◽  
Domain Experts ◽  
Multiple Data ◽  
The Individual ◽  
Knowledge Validation ◽  
Structured Approach ◽  
Standard Framework ◽  
Practical Implications

Purpose This paper aims to explore the use of the knowledge management (KM) perspective for configuration projects. Configuration projects implement configurators as information technology systems that help companies manage the specification process of customised products. An effective method of retrieving and formalising knowledge for configurators is essential, because it can reduce the risk of unsuccessful implementation and the time and effort required for development. Unfortunately, no standard KM frameworks are available specifically for configuration projects. This study identifies the knowledge necessary for different phases of a configuration project (which knowledge, for what purpose and from what sources), examines how it is transformed during a configuration project (what KM activities and tools are used) and establishes how the knowledge can be documented for future maintenance and updates. Design/methodology/approach This paper proposes a four-step framework for making the KM process more efficient in configuration projects. The framework is based on the literature, developed in collaboration with industrial partners and tested on four configuration projects in two engineering companies. The framework is a structured KM approach designed to save time for both domain experts and the configuration team. The authors have used a qualitative exploratory design based on multiple data sources: documentation, workshops and participant observation. Findings The proposed framework comprises four steps: determination of the system’s scope, to establish the project’s goal based on stakeholders’ requirements and prioritise the required products and processes; knowledge acquisition, to classify the knowledge according to the desired output and identify different knowledge sources; modelling and knowledge validation; and documentation and maintenance, to ensure that the KM system can be maintained and updated in the future. Research limitations/implications Because the framework is tested on a limited number of cases, its generalisability may be limited. However, focusing on a few case applications allows us to assess the effectiveness of the framework in detail and in depth to identify the practical challenges of applying it. The results of the tests support the framework’s validity. Although the framework is designed mainly for engineering companies, other industries could benefit from using it as well. Practical implications The individual steps of the framework create a structured approach for the KM process. Thus, the approach can save both time and resources for companies, without the need for additional investment. Originality/value A standard framework is lacking in the literature on KM for configuration projects. This study fills that gap by developing a KM framework for configuration projects, based on KM frameworks developed for IT projects, and KM tools.

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