Qatar University Institutional Repository: Recent submissions
Now showing items 1-20 of 22301
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The fictitious force method for efficient calculation of vibration from a tunnel embedded in a multi-layered half-space
( Elsevier , 2014 , Article)This paper presents an extension of the Pipe-in-Pipe (PiP) model for calculating vibrations from underground railways that allows for the incorporation of a multi-layered half-space geometry. The model is based on the ... -
A mixed space-time and wavenumber domain model for predicting ground vibration from railway tracks
( National Technical University of Athens , 2015 , Conference Paper)In this paper, a mixed model for studying ground vibration generated from surface railway tracks is presented. A ballasted track with nonlinear resilient components is modelled in the time domain using the Finite Element ... -
Modelling the dynamic pile-soil-pile interaction in a multi-layered half-space
( DC/ConfOrg , 2015 , Conference Paper)Within the context of railway ground-borne vibration, the dynamic pile-soil-pile interaction remains an area that has not been sufficiently investigated. Whilst a number of researchers have scrutinised the vibration response ... -
The PiP model and progress in ground vibration from railways
( Australian Acoustical Society , 2017 , Conference Paper)Vibration in the ground causes problems. At large amplitude vibration causes damage, the most obvious example being earthquake damage. But the ground motion in a damaging earthquake is typically low-frequency (below 1Hz) ... -
Accounting for the influence of the free surface on the vibration response of underground railway tunnels: A new iterative method
( KU Leuven - Departement Werktuigkunde , 2020 , Conference Paper)This paper presents a new method for calculating the ground-borne vibration from shallow underground railways. The method is based on an iterative wave-scattering approach, which decouples the problem into two sub-systems: ... -
Numerical study on the damping characteristics of a shock absorber valve utilizing different velocities through CFD analysis
( National Technical University of Athens , 2021 , Conference Paper)Shock absorbers or hydraulic dampers are power dissipating devices. The fluid flow inside the damper is governed by predefined passages. The damping effect is accomplished by the resistance of oil to flow through the ... -
Microbially induced calcite precipitation in calcareous soils by endogenous Bacillus cereus, at high pH and harsh weather
( Elsevier , 2020 , Article)Microbially induced calcite precipitation (MICP) improves the physical properties of soils by increasing the solid content, decreasing the pore sizes and improving the rigidity of the particle-to-particle contact ending ... -
Plastic waste in a circular economy
( Elsevier , 2020 , Book Chapter)Plastic is a commodity that supports our modern lifestyles. Its remarkable range of properties (e.g., durability, lightweight, good barrier properties) combined with the ease of processing make plastic a sustainable ... -
Investigating the effect of polymer-modified graphene oxide coating on RO membrane fouling
( Elsevier , 2022 , Article)The development of novel reverse osmosis (RO) membranes resistant to multiple types of fouling is a need to secure clean water production and meet rising water demands. In this paper, the RO membrane surface-functionalized ... -
Bayesian network and response surface methodology for prediction and improvement of bacterial metabolite production
( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)The optimization of antifungal activity production by Bacillus amyloliquefaciens was carried out using Response Surface Methodology (RSM) in two steps. The first step involved the screening of cultural parameters affecting ... -
The use of principle component analysis and MALDI-TOF MS for the differentiation of mineral forming: Virgibacillus and Bacillus species isolated from sabkhas
( Royal Society of Chemistry , 2020 , Article)Occurrence of mineral forming and other bacteria in mats is well demonstrated. However, their high diversity shown by ribotyping has not been explained, although it could explain the diversity of formed minerals. Common ... -
Optimization of bioinsecticides overproduction by Bacillus thuringiensis subsp. kurstaki using linear regression
( Polish Society of Microbiologists , 2013 , Article)A multiple linear regression analyses were performed to screen for the significant factors simultaneously influencing production of delta-endotoxin, proteolytic activities and spore formation by a Bacillus thuringiensis ... -
Evidencing the role of carbonic anhydrase in the formation of carbonate minerals by bacterial strains isolated from extreme environments in Qatar
( Elsevier , 2022 , Article)Calcium carbonate, one of the most abundant minerals in the geological records is considered as primary source of the carbon reservoir. The role of microorganisms in the biotic precipitation of calcium carbonate has been ... -
Date pits based nanomaterials for thermal insulation applications - Towards energy efficient buildings in Qatar
( Public Library of Science , 2021 , Article)Air-conditioning systems make the most significant part of energy consumption in the residential sector. There is no denying that it is essential to produce a comfortable indoor thermal environment for residents in a ... -
Characterization and assessment of process water from oil and gas production: A case study of process wastewater in Qatar
( Elsevier , 2022 , Article)This study characterized and assessed three different process water (PWWs) (S-1, S-2, and S-3) from oil and gas production in Qatar. The wastewater generated in various processing stages contains many harmful components ... -
Delineating the global plastic marine litter challenge: clarifying the misconceptions
( Springer , 2020 , Article)Plastics, owing to their various beneficial properties (durability, flexibility and lightweight nature), are widely regarded as the workhorse material of our modern society. Being ubiquitously and increasingly present over ... -
Application of statistical experimental design for optimisation of bioinsecticides production by sporeless Bacillus thuringiensis strain on cheap medium
(2013 , Article)In order to overproduce bioinsecticides production by a sporeless Bacillus thuringiensis strain, an optimal composition of a cheap medium was defined using a response surface methodology. In a first step, a Plackett-Burman ... -
Shear and Tensile Strength Measurements of CaCO 3 Cemented Bonds between Glass Beads Treated by Microbially Induced Carbonate Precipitation
( American Society of Civil Engineers (ASCE) , 2023 , Article)The particle-scale shear and tensile strength measurements of microbial-induced calcite precipitation (MICP) treatment have been investigated in this paper. Glass beads were used to represent sand particles. Three ... -
Valorization of palm tree (Phoenix dactylifera L.) leaves from harsh weather climate by silage using endogenous lactic acid bacteria, and application of MALDI-TOF MS for study of populations dynamics
( Elsevier , 2023 , Article)Preservation of green palm leaves by silage preserves them as green feed in addition to the added value of probiotics and prebiotics. In this work, the characterization of fresh palm tree leaves was performed. The isolation ... -
Reuse of Sludge as Organic Soil Amendment: Insights into the Current Situation and Potential Challenges
( MDPI , 2023 , Article Review)Sludge generation as an organic by-product of wastewater treatment has seen a consistent increase worldwide due to population growth and industrial activities. This poses a chronic challenge regarding management options ...
