Factors affecting gel strength design for conformance control: An integrated investigation

Dheiaa Alfarge; Ahmed M. Aljarah; Mingzhen Wei; Baojun Bai; Najeh Alali; Abdul-Hussain Al-Shibly; Usama Alameedy

doi:https://doi.org/10.1016/j.petrol.2021.108711

Details

Publication Date

Wed Sep 01 2021

Journal Name

Journal Of Petroleum Science And Engineering

Volume

204

DOI

https://doi.org/10.1016/j.petrol.2021.108711

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Factors affecting gel strength design for conformance control: An integrated investigation

Conformance control

Gel treatment

Water production in oil wells

Water flooding

Numerical simulation

Enhanced oil recovery

Dheiaa Alfarge

Ahmed M. Aljarah

Mingzhen Wei

Baojun Bai

Najeh Alali

Abdul-Hussain Al-Shibly

Usama Alameedy

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Publication Date

Tue Aug 01 2023

Journal Name

Journal Of Engineering

Comparative Analysis of H2 and H∞ Robust Control Design Approaches for Dynamic Control Systems

Robust Control

Uncertainties

H2

H∞

Anwer J.

Hayder H.

Hassan

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This paper discusses using H2 and H∞ robust control approaches for designing control systems. These approaches are applied to elementary control system designs, and their respective implementation and pros and cons are introduced. The H∞ control synthesis mainly enforces closed-loop stability, covering some physical constraints and limitations. While noise rejection and disturbance attenuation are more naturally expressed in performance optimization, which can represent the H₂ control synthesis problem. The paper also applies these two methodologies to multi-plant systems to study the stability and performance of the designed controllers. Simulation results show that the H2 controller tracks a desirable cl

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(2)

Publication Date

Mon Dec 03 2018

Journal Name

Journal Of Engineering

Variable Structure Control Design for a Magnetic Levitation System

Magnetic levitation

Variable structure control

Area of attraction

chattering attenuation.

Shibly Ahmed

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In this paper the variable structure control theory is utilized to derive a discontinuous controller to the magnetic levitation system. The magnetic levitation system model is considered uncertain, which subjected to the uncertainty in system parameters, also it is open-loop unstable and strongly nonlinear. The proposed variable structure control to magnetic levitation system is proved, and the area of attraction is determined. Additionally, the chattering, which induced due to the discontinuity in control law, is attenuated by using a non-smooth approximate. With this approximation the resulted controller is a continuous variable structure controller with a determined steady state error according to the selected control

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(1)

Publication Date

Sat Dec 01 2018

Journal Name

Al-khwarizmi Engineering Journal

Design and Implementation of an Automatic Control for Two Axis Tracking System for Applications of Concentrated Solar Thermal Power

Arduino

tracking system

solar collector.

Saad Tami

Jamal Abdul-Kareem

Laith Muhsin

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The present work presents design and implementation of an automated two-axis solar tracking system using local materials with minimum cost, light weight and reliable structure. The tracking system consists of two parts, mechanical units (fixed and moving parts) and control units (four LDR sensors and Arduino UNO microcontroller to control two DC servomotors). The tracking system was fitted and assembled together with a parabolic trough solar concentrator (PTSC) system to move it according to information come from the sensors so as to keep the PTSC always perpendicular to sun rays. The experimental tests have been done on the PTSC system to investigate its thermal performance in two cases, with tracking system (case 1) and without trackin

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(2)

Publication Date

Sat Oct 01 2016

Journal Name

Journal Of Theoretical And Applied Information Technology

Factors affecting global virtual teams’ performance in software projects

Today the trend is to perform software development work via distributed geographical area among team

individual or even as an organization. However

due to the global market and international presence of many companies

there is a need to implement a global virtual teams. The global virtual team members are gradually engaged in globalized business environments across space

time and organizational boundaries via information and communication technologies. A global virtual team relies on communication

collaboration

and information exchange are the most important criteria in global virtual teams’ operations. The purpose of this paper is to answer two research questions. The first research question is to identify the factors affecting global virtual teams’ performance. A systematic literature review was conducted to answer the first research question. The second research question is on what the rank of the factor affecting the global virtual teams’ performance according to their level of effect on global virtual teams’ performance. Online survey was conducted within 103 developers and IT managers from eight IT companies to answer the second research question. The Statistical Package for Social Science (SPSS 22) was used to analyze the collected data. In this study

we investigated factors that affect global virtual teams’ performance

factors considered include cultural differences

language problems

time-zone differences

team size

technical problems

lack of trust

lack of sufficient training

and ICT problems. Also the findings indicated that lack of sufficient training is the highest level of effect on global virtual teams’ performance. On the other hand

Ali Yahya Gheni

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(23)

Publication Date

Thu Sep 01 2016

Journal Name

Journal Of Engineering

Sliding Mode Vibration Suppression Control Design for a Smart Beam

Active vibration control

Finite Element

sliding mode control

sliding mode observer

spillover.

Mohsin N.

Shibly Ahmed

Imad Abdulhussein

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Active vibration control is the main problem in different structure. Smart material like piezoelectric make a structure smart, adaptive and self-controlling so, they are effective in active vibration control. In this paper piezoelectric elements are used as sensors and actuators in flexible structures for sensing and actuating purposes, and to control the vibration of a cantilever beam by using sliding mode control. The sliding mode controller (SMC) is designed to attenuate the vibration induced by initial tip displacement which is equal to 15 mm. It is designed based on the balance realization reduction method where three states are selected for the reduced model from the 24^th states that describe the c

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Publication Date

Thu Dec 26 2019

Journal Name

Journal Of Accounting And Financial Studies ( Jafs )

Factors affecting the support of local investment in iraq for the period(1996-2015)

نبيل ابراهيم

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This paper aims to explain the effect of the taxes policy including direct & indirect taxes on supporting the domestic Investment in Iraq. This could help the official planners for drawing the future policies that help provoking (istumlating) the domestic investment in Iraq the quantitative analysis approach was adopted using regression model. The results showed the significance of the effects of both direct & indirect taxes policies on domestic as a simple correlation coefficient ( r ) of ( 0.6 ) , ( 0.64 ) respectively.

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Publication Date

Fri Nov 03 2023

Journal Name

Iraqi Journal Of Pharmaceutical Sciences( P-issn 1683 - 3597 E-issn 2521 - 3512)

Diacerein Loaded Novasome for Transdermal Delivery: Prepartion , In-Vitro Characterization and Factors Affecting Formulation

Diacerein

Novasome

Transdermal Delivery

Vesicular System

Noor Yousif

Hanan Jalal

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Diacerein (DCN) is a semi-synthetic anthraquinone derivative of Rhein that is indicated for the management of osteoarthritis. Diacerein exhibits poor dissolution in the GIT fluids and suffers from low bioavailability upon oral administration in addition to the laxative effect of Rhein metabolites. The aim of the present study was to develop novasomal vesicles with optimized entrapment efficiency and size to serve as a carrier for transdermal delivery of diacerein. Novasomal vesicles were prepared by thin film hydration method thin film hydration. The prepared vesicles were optimized utilizing different surfactant to cholesterol molar ration, sonication type, different sonication times and varying fatty acid level. The prepared vesicles were

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Publication Date

Thu Mar 30 2017

Journal Name

Iraqi Journal Of Pharmaceutical Sciences ( P-issn 1683 - 3597 E-issn 2521 - 3512)

Factors Affecting the Formulation of Carbamazepine Extended Release Tablet

Samer

Alaa

Ahmed

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Carbamazepine is an anticonvulsant agent which acts on the central nervous system and used for the treatment of epilepsy. Carbamazepine was formulated as an oral extended release tablets using ethyl cellulose as retardant substance. Different types of tablets additives such as cellulose materials (sodium carboxymethyl cellulose and microcrystalline cellulose ), lactose, calcium phosphate and solubilizing agents ( sodium lauryl sulphate and polyethylene glycol 6000) were utilized to study their effect on the release profile of drug from ethyl cellulose matrices. It was found that sodium carboxymethyl cellulose increased the carbamazepine release and the same effect was obtained when the same amount of microcrystalline cellulose used

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Publication Date

Wed Nov 22 2017

Journal Name

Environmental Toxicology And Chemistry

Factors affecting the dissipation of pharmaceuticals in freshwater sediments

Omar S.A.

Ed

Alistair B.A.

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Abstract<sec><label></label><p>Degradation is one of the key processes governing the impact of pharmaceuticals in the aquatic environment. Most studies on the degradation of pharmaceuticals have focused on soil and sludge, with fewer exploring persistence in aquatic sediments. We investigated the dissipation of 6 pharmaceuticals from different therapeutic classes in a range of sediment types. Dissipation of each pharmaceutical was found to follow first‐order exponential decay. Half‐lives in the sediments ranged from 9.5 (atenolol) to 78.8 (amitriptyline) d. Under sterile conditions, the persistence of pharmaceuticals was considerably longer. Stepwise multiple linear regression analysis was performed to </p></sec> ... Show More

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Publication Date

Wed Jun 30 2004

Journal Name

Iraqi Journal Of Chemical And Petroleum Engineering

Factors Affecting the Operation of a Fire Tube Boiler

Cecilia K.

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