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Impact of cash flow variation on project performance: contractors’ perspective

Tarawneh Sultan, Almahmoud Anoud Fawwaz, Hajjeh Hassan

Engineering Management in Production and Services

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2023

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Vol. 15, no. 1

73--85

EN

This study aims to determine the impact of cash flow variation in Jordanian construction projects from contractors’ perspective and its relationship with project performance. An online questionnaire was developed and distributed to a selective sample. The respondents were project managers from contracting companies working in Jordan, around 340 construction companies. The sample frame was a form of non-probability sampling of 181 project managers. The collected data were analysed using the Statistical Package of the Social Sciences (SPSS) version 25. The study results showed a positive statistically significant effect at the significance level (α ≤0.05) of cash flow variation on project performance in Jordanian construction projects. In addition, respondents indicated a high level of agreement on the impact of cash flow variation on projects’ performance, with a mean of 4.01 and a standard deviation of .546. However, on the project performance dimensions’ level, Quality came first, with a mean of 4.11 and at a high level, followed by Safety, with a mean of 4.01 and at a high level, while Final Cost ranked third with a mean of 3.96 and at a high level. Finally, Project Final Duration ranked fourth with a mean of 3.95. The researchers recommended the necessity of more efforts for a better understanding of the importance of cash flow by contractors to schedule project activities correctly and efficiently to maintain a steady state of the project cash flow.

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Investigating the role of leadership styles and governance on project performance in megaprojects

Al-Subaie Abdulla Abdulaziz, Faisal Mohd Nishat, Aouni Belaid, Jabeen Fauzia

Polish Journal of Management Studies

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2021

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Vol. 23, No. 1

45--58

EN

Megaprojects are very large-scale complex ventures that involve multiple stakeholders and influence millions of lives. In the literature, leadership styles and governance have been found to have significant relationship with project performance. However, majority of the research on megaprojects are in the Western contexts. Thereby, the emerging economies in Middle East, which have seen many megaprojects in recent times, provide unique setting to test various theories. Based on the review, a theoretical model relating various leadership styles and governance with project performance is proposed. The proposed model is empirically tested using data from 157 senior managers from megaprojects in Qatar. The results of the study shows a positive relationship between transformational style of leadership and megaproject performance. It also establishes positive relationship between project governance and megaproject performance. However, no relation was found between transactional style and passive style of leadership with megaproject performance. The results of the study provides managers direction to develop mechanisms to facilitate transformational leadership development. Further, top managers need to be proactively involved in the project governance for smooth and successful implementation of organizational strategies leading to megaproject success.

PL

Megaprojekty to złożone przedsięwzięcia na bardzo dużą skalę, które obejmują wielu interesariuszy i wpływają na miliony istnień ludzkich. W literaturze stwierdzono, że style przywództwa i zarządzanie mają istotny związek z wynikami projektu. Jednak większość badań nad megaprojektami odbywa się w kontekście zachodnim. W ten sposób wschodzące gospodarki na bliskim Wschodzie, które w ostatnim czasie były świadkami wielu megaprojektów, zapewniają wyjątkowe warunki do testowania różnych teorii. Na podstawie przeglądu zaproponowano model teoretyczny łączący różne style przywództwa i zarządzania z wynikami projektu. Proponowany model jest testowany empirycznie z wykorzystaniem danych od 157 menedżerów wyższego szczebla z megaprojektów w Katarze. Wyniki badania wskazują na pozytywny związek między transformacyjnym stylem przywództwa a wynikami megaprojektu. Ustanawia również pozytywny związek między zarządzaniem projektem a wydajnością megaprojektu. Nie znaleziono jednak związku między stylem transakcyjnym a pasywnym stylem przywództwa a wydajnością megaprojektu. Wyniki badania wskazują menedżerom kierunek rozwoju mechanizmów ułatwiających rozwój przywództwa transformacyjnego. Ponadto kierownicy najwyższego szczebla muszą aktywnie uczestniczyć w zarządzaniu projektem, aby zapewnić płynne i skuteczne wdrażanie strategii organizacyjnych prowadzących do sukcesu megaprojektu.

3

Use of 3-dimensional finite elements for computation of temperature distribution in the Stator of an Induction Motor during Direct-On-Line Starting

Bhattacharya N. K., Naskar A. K., Sarkar D.

Journal of Power Technologies

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2017

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Vol. 97, nr 4

347--353

EN

Transient thermal analysis of induction machines is a subject of interest for machine designers in their effort to improve machine reliability. Since the stator is static, it is prone to overheating. Therefore, the study of transient thermal behavior in the stator is useful to identify causes of failure in induction machines. This paper presents a three-dimensional transient heat flow through the stator of an induction motor using arch shaped elements in the r-θ-z plane of the cylindrical co-ordinate system. A temperature-time method is employed to evaluate the distribution of loss in various parts of the machine. Using these loss distributions as an input for finite-element analysis, more accurate temperature distributions can be obtained. The model is applied to one squirrel cage Totally Enclosed Fan Cooled (TEFC) machine of 7.5 kW. Finally, the temperatures obtained by this three-dimensional approximation at different locations of the stator were compared for different stator currents considering the time required for each stator current during the transient in Direct-On-Line starting.

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A mathematical analysis of two dimensional steady state heat conduction in the coil of an induction heater using finite element method

Roy D., Naskar A. K., Sadhu P. K.

Journal of Power Technologies

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2017

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Vol. 97, nr 3

214--219

EN

In developing heaters typically an induction heater within specific temperature limits can be a key issue impacting the efficiency of the overall policy, as the typical loading of an induction heater is costly. Mathematical modelling is highly useful in terms of estimating the rise in temperature and in shedding light on the wider processes. The projected model might in addition reduce computing prices. The paper develops a 2-Dimensional (2-D) steady state thermal model in polar co-ordinates by means of finite element formulation and arch shaped components. A temperature time methodology is utilized to calculate the distribution of loss in various elements of the induction heater and used as input for finite element analysis. Additional precise temperature distributions are obtained. The projected model is applied to predict the temperature rise within the coil of the induction heater 3200 W totally encircled fan-cooled induction heater. The temperature distribution was determined considering convection from the outer air gap surface and circular finish surface for each entirely encircled and semi encircled structures.