A type of EOR, secondary production includes water flooding and gas injection. Normally, gas is injected into the gas cap and water is injected into the production zone to sweep oil from the reservoir. A pressure-maintenance program can begin during the primary recovery stage, but it is a form of enhanced recovery. The main purpose of this report is to investigate the effect of the reservoir rock compressibility on oil recovery factor during gas injection. The problem statement of this study is firstly, as the reservoir oil and gas production under primary conditions, causes the reservoir pressure to decline. Secondly, A gas injection is required to re-energize or “re-pressurize" the reservoir. The main objective of this project is to investigate the effect of the reservoir fluid densities on oil recovery factor during gas injection. By using ECLIPES Software, we model the data and find out the best prediction of gas injection that is suitable for the available field data. It is proven that the optimum oil production is by injection a high amount of injection rate. The highest increase in percentage of the total gas production is when an injection of 54 MMSCF is 0.58 %. The higher the compressibility value of the rock, will give the higher the rate of oil and gas production. The relationship between oil rate, gas rate, pressure, and oil recovery factor are directing the compressibility of rocks is a direct relationship.

Daily incidents significantly impact the workflow of ambulance and healthcare personnel, whose critical role involves providing immediate medical treatment and facilitating transportation to hospitals. This study presents the design of a medical expert system aimed at enhancing first-aid response in ambulances and educating users on fundamental first-aid principles. The proposed system integrates a comprehensive knowledge base that catalogs disease symptoms and corresponding treatments, functioning similarly to a medical professional's guidance. While the system relies on pre-programmed symptoms, it allows for the continuous addition of new symptoms and diseases, ensuring adaptability in emergencies. This expert system is particularly beneficial for novice healthcare providers, equipping them with reliable diagnostic support and improving patient outcomes during medical emergencies.

This paper investigates the resonance phenomenon and modal characteristics of a screw air compressor base frame in the cement manufacturing industry. Numerical analysis and data comparison techniques were used to identify and analyze the resonance issue in a specific compressor at Souq Al-Khamis Cement Factory. The research begins by studying the natural frequencies and mode shapes of the compressor base frame through Finite Element Method (FEM) using the ANSYS Workbench. Practical measurements are conducted using the PHYPHOX App Vibration Analyzer to obtain vibration data from the compressor. The findings of this study contribute to understanding the resonance phenomenon in screw air compressors and provide valuable insights for improving the design and maintenance of compressor base frames in the cement manufacturing industry. By identifying the relationship between excitation frequencies and natural frequencies, measures can be taken to mitigate resonance-related vibration problems and ensure the reliable operation of cement production equipment.

Blades are the very important components of wind turbines in order to convert wind energy to mechanical or electrical energy. Therefore, the aerodynamic forces acting on the horizontal wind turbine blades have an important role in their performance. The objective of this paper is to investigate the aerodynamic characteristics and power generation properties for a NREL PHASE VI wind turbine blade. For this purpose, an analysis procedure based on the Blade Element Method (BEM) is demonstrated for a horizontal-axis wind turbine model (HAWT), and the methodology approach is discussed in detail throughout this paper. In this study, a Math Lab code has been developed for analyzing a model of Horizontal-Axis Wind Turbine (HAWT) in order to display aerodynamic behaviour on the blade. The NACA S809 airfoil was selected for the analysis of the wind turbine blade, where the tip and root losses proposed by Prandtl are also executed. The calculated results are validated using Q-Blade commercial software at rated wind speed of 10 m/s and show that the BEM is a good method of aerodynamic investigation of a HAWT blade

Abstract::

The growing urgency for sustainable construction practices has necessitated a reevaluation of traditional design approaches in favor of more environmentally responsible methodologies. This paper presents a comparative analysis between optimal and adequate structural design within the context of sustainable construction. Focusing on two case studies—a cutting-edge, sustainably designed commercial building (the Bullitt Center) and a conventional mid-rise residential building in Chicago—the research explores how different design philosophies impact material efficiency, environmental footprint, economic performance, and occupant satisfaction.Through detailed life cycle assessments (LCA) and life cycle energy analyses (LCEA), the study quantifies the advantages of optimal design, which integrates advanced materials, renewable energy systems, and water conservation technologies. The findings demonstrate that while optimal design requires a higher initial investment, it significantly reduces long-term operational costs and environmental impact, achieving a net-zero energy status and greatly improving occupant well-being. In contrast, the conventional building, which adheres to standard design practices, exhibits higher embodied energy, greater environmental degradation, and lower occupant satisfaction.The paper concludes that optimal structural design is not only more sustainable but also economically viable over the building's life span. It emphasizes the importance of integrating sustainability from the earliest stages of design to achieve meaningful environmental and economic benefits. The study calls for the adoption of policy incentives and advanced modeling tools to facilitate the widespread implementation of optimal design principles in the construction industry.

Abstract

Blades are the very important components of wind turbines in order to convert wind energy to mechanical or

electrical energy. Therefore, the aerodynamic forces acting on the horizontal wind turbine blades have an important role in

their performance. The objective of this paper is to investigate the aerodynamic characteristics and power generation

properties for a NREL PHASE VI wind turbine blade. For this purpose, an analysis procedure based on the Blade Element

Method (BEM) is demonstrated for a horizontal-axis wind turbine model (HAWT), and the methodology approach is discussed

in detail throughout this paper. In this study, a Math Lab code has been developed for analyzing a model of Horizontal-Axis

Wind Turbine (HAWT) in order to display aerodynamic behaviour on the blade. The NACA S809 airfoil was selected for the

analysis of the wind turbine blade, where the tip and root losses proposed by Prandtl are also executed. The calculated results

are validated using Q-Blade commercial software at rated wind speed of 10 m/s and show that the BEM is a good method of

aerodynamic investigation of a HAWT blade

Abstract

This investigation examines the performance of tension and compression connections in steel beam-column assemblies and concrete slabs, with a particular focus on end-plate joints employing four bolts. By utilising advanced finite element modelling (FEM) and simulation techniques, the study aims to elucidate the behaviour of these joints under both service and extraordinary load conditions. While these connections exhibit favourable flexibility and resilience during typical use, they present challenges in transmitting exceptional loads without incurring joint failure and potential structural collapse, particularly when subjected to unexpected loading scenarios. The research employs a meticulous analytical approach utilising ABAQUS/CAD software. This analysis incorporates a comprehensive evaluation of various parameters, including inherent structural imperfections, material properties, the interplay between steel and concrete, and the influence of non-linear material behaviour. The findings indicate that while these joints perform adequately under standard loading conditions, they may exhibit susceptibility to failure under extreme stresses. This underscores the critical need for the development of adaptable and robust steel beam-column connections to ensure paramount structural safety and stability. Furthermore, the study emphasises the significance of continuous advancements in modelling and simulation techniques, enabling the effective resolution of intricate structural challenges. This investigation offers valuable insights that can be harnessed to develop more efficient and secure composite steel-concrete structures. Furthermore, the study emphasises the significance of continuous advancements in modelling and simulation techniques, which can be employed to mitigate potential structural hazards and enhance building practices, ultimately leading to safer and more resilient structures. © 2024 by authors, all rights reserved.

Author keywords

ABAQUS/CADComposite JointsDurabilityEnd Plate ConnectionsExceptional LoadsFlexibilitySimulation

• ISSN: 23321091
• Source Type: Journal
• Original language: English
• DOI: 10.13189/cea.2024.120437
• Document Type: Article
• Publisher: Horizon Research Publishing

  Saleh, B.; Department of Civil Engineering, School of Science Engineering, Libyan Academy, State of Libya

© Copyright 2024 Elsevier B.V., All rights reserved.

The Libyan healthcare system faces significant challenges in medication management, with high rates of medication errors posing serious risks to patient safety. Digital transformation, particularly through the adoption of electronic medical prescriptions, offers a promising solution to enhance prescription accuracy, improve patient outcomes, and streamline healthcare processes. This technical paper examines the implementation of digital medical prescriptions in Libya, focusing on the role of health informatics, the validation of prescriptions, and the potential barriers to success. The paper also highlights efforts in Arab and African countries similar to Libya, showcasing best practices and lessons learned.

Keywords: Digital prescriptions, Libya healthcare system, Medication errors, Patient safety, Digital transformation, Prescription practices, Prescription accuracy, Handwritten prescriptions, Prescription software, electronic health record systems (EHRS).

The increasing use of inverter-based generation (IBG) in power grids raises concern about system  strength. This is partly due to the inherent interactions among multiple IBGs in close proximity to  one another. This paper proposes an approach to identifying the existential boundary of interaction  in a network using the relative electrical distance (RED) concept. The mathematical formulation of  the RED concept to address the interaction problem among the IBGs involved utilising the power  system network’s admittance matrix to capture its structural characteristics. An interaction matrix  derived from the RED values of all IBG pairs was then developed to identify the interacting IBG  groups. The proposed approach was demonstrated using the IEEE 39-bus system and a practical 72-bus  Nigerian power grid. Results showed that RED values effectively group interacting IBGs, with values  closer to 0 signifying higher interaction levels, values closer to 1 indicating lower interaction,  and a value of 1 denoting no interaction. Time-domain simulations confirmed the accuracy of the  approach, demon- strating that the effect of control interaction propagates proportionally to  neighbouring IBGs based on RED values. However, fault currents can influence the impact of control  interactions. This approach, which requires less computational effort, provides a quick  identification tool for potential areas of concern based on the degree of interaction, enhancing  the reliability of power grids with high IBG penetration.

Abstract

This project investigated the stresses developed in a thick-walled cylinder for rocket motor case

under internal pressure. Stress analysis used the finite element method with ANSYS software for

rocket motor case selection. This study focus on structural elastic analysis of thick-walled pressure

vessels since it is a common design practice to aim at maintaining the induced stresses within the

elastic region. However, pressure vessels operate under complex environments such as high

pressure which may lead to gross plastic deformation and subsequent failure. In process, the

pressure vessel is pressurized beyond the yield point. As a result, the conventional elastic analysis

will not be applicable at internal pressures above the yield point. Therefore, it is important to

examine the structural integrity of a thick-walled pressure vessel in both elastic and plastic state

of the material.

In this study, FE static structural analysis of a presumably untracked thick-walled solid rocket

motor case has been presented, where stress distribution within the motor case wall and the

resulting material deformation were investigated using ANSYS 19.2. Motor case has been designed

with uniform model of the same internal and external diameter, and motor case with diameter

change at both sides is modeled to investigate the effect of the diameter change or shape

discontinuity on the resulting of stresses and deformation using ANSYS program by applying

internal pressure varying from 50 Bars to 350 Bar. Von Mises yield criteria were used by ANSYS

program and calculated Von Mises stresses were compared; the results are close for elastic

analysis. The results show that the Von Mises stresses was high for discontinues shape of motor

case compared by the uniform motor case (constant thickness).