计量经济分析 = Econometric analysis

Why peer discussion improves student performance on in-class concept questions

Delays in construction projects: The case of Jordan

Modern Construction Management is a textbook for advanced studies in construction management. It is a substantial volume of 572 pages with general descriptions, partly detailed texts, numerous exam...

Modern Construction Management

Despite their negative impact on the construction industry, cost overruns have become an almost natural part of building and infrastructure projects. This paper examines the phenomenon as a worldwide problem, identifies its root causes, ranks them (on a local basis), and analyses them. Root-cause analysis is not merely an arbitrary expression; rather, it is a systematic, formal, well-structured methodology, used as part of the total quality-management approach. The expand–focus principles and techniques were applied in this research for assembling an initial, as wide as possible, inclusive list (pool) of 146 potential causes gathered from the international professional literature as well as from prominent local experts. Through two cycles of expand–focus, they were filtered and merged into merely 15 independent universal root causes. These were further investigated through a cross-sectional survey among 200 local construction practitioners who ranked the 15 universal root causes according to their...

Root-Cause Analysis of Construction-Cost Overruns

E-learning offers tremendous benefits to teachers and students as it enhances the teaching and learning experience. Despite the adoption of e-learning in many educational institutions worldwide, de...

Video-based e-learning for an undergraduate engineering course:

Using the linear elastic finite element method, we investigated how defects significantly influence the integrity of 3D-printed parts made from biodegradable material by experimental techniques and numerical simulations. A defective flaw was incorporated into the tensile test dog-bone sample using Computer-Aided Design and processed by slicing software. Three distinct raster angles examine two sets of samples, one featuring intact specimens and the other with the introduced defects. An open-source 3D printer was used to fabricate both sets of samples, utilizing biodegradable PLA material. In finite element analysis, we employed a highly detailed model that precisely accounted for the geometry and dimensions of the extruded 3D-printed filament, accurately replicating the actual configuration of the 3D-printed samples to an extent. Our study involved a thorough comparative analysis between the experimental results and the FEA simulations. Our findings uncovered a consistent trend for the intact and defective samples under tensile load. Specifically, in the intact case, the samples with a zero-degree raster orientation presented the highest resistance to failure and displayed minimal elongation. Remarkably, these conclusions paralleled our observations of the defective samples as well. Finite element analysis revealed that the stresses, including Principal, Max shear, and Von Mises, were remarkably higher at the 3D-printed samples’ outer surface than the inner layers, reflecting that the failure starts at the outer surface since they exceeded the theoretical values, indicating a significant discrepancy between the simulated and anticipated values.

A Comparative Investigation of the Reliability of Biodegradable Components Produced through Additive Manufacturing Technology

Fostering Students Ethical Engagement by Employing Online Interactive Platforms for Engineering Ethics Education

Analytical Study on the Use of Dampers Retrofitted in Buildings to Enhance Their Seismic Resilience

A finite element model was developed in this research to investigate the impact of defects on the mechanical properties of a 3D-printed composite sandwich panel that could occur during the layer alteration period between the dissimilar materials, affecting the interfacial strength between the layers and causing the 3D-printed panel to fail. Numerous parameters, such as interfacial position, size, material properties, and location of defects along the panel, have been examined that might affect the failure mechanism. This finite element study adopted linear elastic behavior by utilizing ANSYS simulation program. The outcomes showed that the midsection of the composite is under a lot of stress, and as we approach the edges of the composite, the tension concentration falls outward until it reaches zero. In the intact scenario, the deformation was zero at either end of the panel and highest in the composite middle. The shear stress was most significant in the center, and it decreased as we moved closer to the extremities of both sides, it gradually decreased until it was lowest there. The endpoints where we have support responses have significant maximum shear stresses, which could degrade the material overall mechanical properties. This rise in the maximum principle stress at the end support could be due to the reaction of the fixed support, which tries to counteract the applied flexural load and raise the maximum principle stress.

Mechanical Performance of Defective FDM Multi-Layer Material Panels

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