PROJECT RISKS DURING THE COVID-19 PANDEMIC AND THEIR EFFECTS ON DELAYS AND COST OVERRUNS
The COVID-19 pandemic has significantly impacted project implementation costs and caused delays across numerous industries. Various analysis found in the literature show that the predominant cause of project delays and higher costs have been people, material, and equipment movement restrictions, supply chain disruptions, and social distancing polic...
By Ilija Stojanović, Marko Selaković, Marija Gačić, Milica Kaplarević, Nenad Filipović
OPTIMIZATION OF FLUID DYNAMICS BY SHEAR THINNING IN STIRRED TANKS USING ANCHOR STIRRERS WITH CONVERGENT HOLLOWS
Agitator shapes are of paramount importance in mixing processes, prompting researchers to explore new configurations to improve these operations. Our study focuses on the three-dimensional fluid dynamics in a flat-bottomed cylindrical tank equipped with different anchor shapes, ranging from the standard configuration to modified variants. Using bot...
By Abderrahim Sidi Mohammed Nekrouf, Sarra Youcefi, Mohamed Bouzit
LOAD-CARRYING CAPACITY OF PIVOTED CURVED SLIDER BEARINGS SUBJECT TO SURFACE ROUGHNESS PATTERN AND NON-NEWTONIAN FLUID FLOW BEHAVIOR
The present paper analyzes the Rabinowitsch fluid (RF) behavior on a pivoted curved slider with surface roughness (SR) with the aid of the perturbation technique. In order to account for the random roughness of the bearing surfaces, a stochastic random variable with a nonzero mean, variance, and skewness was taken into consideration. The averaged R...
By Amit Kumar Rahul, Manoj Kumar Singh, Om Namah Sivaya, Saurabh Chandra Maury, Ravi Tiwari, Rohahn Biswas
DYNAMIC MODEL FOR MEASLES INFECTION WITH SEIRV+D MODEL
This paper explores the dynamics and stability of measles infection within a specified population, utilizing the SEIRV+D model. The study commences by establishing the equilibrium points and determining the reproduction number. The stability of this equilibria is contingent on the calculated reproduction number. The research draws upon real data ob...
By Maja Kukusheva Paneva, Natasha Stojkovik, Vladimir Milićević
ENHANCEMENT OF THERMAL AND ENTROPY PERFORMANCE OF CPU HEATSINK USING HYBRID NANOFLUID UNDER NATURAL MAGNETOHYDRODYNAMIC CONVECTION
The need for effective CPU cooling has become increasingly important with the growing demand for computing performance. In this paper, we numerically investigate the problem of active CPU cooling using hybrid nanofluids. The studied heatsink consists of a parallelepiped-shaped block filled with a hybrid nanofluid, crossed by four tubes through whic...
By Melouka Benyamina, Abderrahim Mokhefi
LIE DERIVATIVE DISCRETIZATION SCHEME FOR SOLVING VARIABLE MASS SYSTEMS
Lie derivative plays a key role in mathematics and physics. In particular, the Lie derivative discretization scheme has been implemented for a relatively large time step in order to quickly solve the numerical solution of the system. In this paper, an algorithm of the Lie derivative discretization scheme is applied to variable mass systems. Four di...
By Xinyue Jia, Chang Liu, Wenan Jiang
SIMULATION OF FLUID-STRUCTURE INTERACTION IN AN ARTERY ALTERED BY SEGMENTAL MEDIOLYSIS
Segmental arterial mediolysis (SAM) is an asymptomatic, non-atherosclerotic and non-inflammatory disease of unknown etiology. It affects medium-sized arteries and is characterized by vacuolization and lysis at the level of the media which can lead to dissection, steno-occlusion, or an aneurysm. In this article, a simulation of fluid-structure inter...
By Mouloud Mohellebi, Mohamed Ferrouk, Hocine Tebbiche
EFFECTS OF GAS RADIATION AND ACCELERATED FLOW ON SOLAR HEATER PERFORMANCE
In this paper, the performance enhancement of solar gas heaters is evaluated by taking the advantage of both radiating gas effect and using converged ducts with the accelerated flow. The analyzed solar gas heater includes the glass cover, air gap, absorber, gas channel, bottom plate, and insulation. The inclined position of the bottom plate relativ...
By Seyed Abdolreza Gandjalikha Nassab
INVERSE IDENTIFICATION METHOD OF PLASTICITY PARAMETERS OF ANISOTROPIC MATERIAL
Nowadays, the finite element method has been widely applied in product calculation and design. One of the critical parameters in finite element modeling are the parameters in the material behavior model. In this study, an inverse procedure determines the values of parameters in the behavior model of anisotropic materials. First, optimization algori...
By Dao Lien Tien, Viet Dung Luong
In this paper, a new design of solar air-water heater for the purpose of performance improvement is introduced for the first time. This thermal system will be a good alternative for both space heating and providing domestic hot water for use in buildings. In the proposed solar collector, the absorbed incoming solar irradiation is transferred into b...
By Seyyed Abdolreza Gandjalikhan Nassab