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Publication Date

Thu Dec 31 2015

Journal Name

Iraqi Journal Of Chemical And Petroleum Engineering

Volume

16

Issue Number

4

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Esterification of Free Fatty Acid with High Chain Alcohol for Biodiesel Production Using Semi-Batch Reactive Distillation

Biodiesel

Reactive distillation

Esterification

Homogeneous catalyst

Wadood T.

Marwa F.

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The esterification of oleic acid with 2-ethylhexanol in presence of sulfuric acid as homogeneous catalyst was investigated in this work to produce 2-ethylhexyl oleate (biodiesel) by using semi batch reactive distillation. The effect of reaction temperature (100 to 130°C), 2-ethylhexanol:oleic acid molar ratio (1:1 to 1:3) and catalysts concentration (0.2 to 1wt%) were studied. Higher conversion of 97% was achieved with operating conditions of reaction temperature of 130°C, molar ratio of free fatty acid to alcohol of 1:2 and catalyst concentration of 1wt%. A simulation was adopted from basic principles of the reactive distillation using MATLAB to describe the process. Good agreement was achieved.

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Publication Date

Wed Jun 01 2011

Journal Name

Journal Of Al-nahrain University Science

A Lexical and Syntax Checker Tool for the Hyper Text Markup Language

Maysa

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Publication Date

Mon May 04 2020

Journal Name

Offshore Technology Conference

Hydrate Equilibrium Model for Gas Mixtures Containing Methane, Nitrogen and Carbon Dioxide

gas hydrate

cavity

equilibrium condition

flow assurance

modeling & simulation

hydrate equilibrium condition

upstream oil & gas

cage occupancy

hydrate

gas mixture

Dhifaf Jaafar

Omar

Stefan

Maxim

Callum

Ahmed

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AbstractGas hydrate formation is considered one of the major problems facing the oil and gas industry as it poses a significant threat to the production, transportation and processing of natural gas. These solid structures can nucleate and agglomerate gradually so that a large cluster of hydrate is formed, which can clog flow lines, chokes, valves, and other production facilities. Thus, an accurate predictive model is necessary for designing natural gas production systems at safe operating conditions and mitigating the issues induced by the formation of hydrates. In this context, a thermodynamic model for gas hydrate equilibrium conditions and cage occupancies of N2 + CH4 and N2 + CO4 gas mix ... Show More

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(6)

Publication Date

Sat May 01 2021

Journal Name

Journal Of Physics: Conference Series

Three Weighted Residuals Methods for Solving the Nonlinear Thin Film Flow Problem

Areej Salah

Majeed A

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AbstractIn this paper, the methods of weighted residuals: Collocation Method (CM), Least Squares Method (LSM) and Galerkin Method (GM) are used to solve the thin film flow (TFF) equation. The weighted residual methods were implemented to get an approximate solution to the TFF equation. The accuracy of the obtained results is checked by calculating the maximum error remainder functions (MER). Moreover, the outcomes were examined in comparison with the 4th-order Runge-Kutta method (RK4) and good agreements have been achieved. All the evaluations have been successfully implemented by using the computer system Mathematica®10.

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(1)

Publication Date

Thu Nov 17 2022

Journal Name

Journal Of Information And Optimization Sciences

Hybrid deep learning model for Arabic text classification based on mutual information

Farah A.

Nada A. Z.

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(1)

Publication Date

Mon Oct 30 2023

Journal Name

Traitement Du Signal

A Comprehensive Review on Machine Learning Approaches for Enhancing Human Speech Recognition

Maha

Husam

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Publication Date

Sun Apr 30 2023

Journal Name

Iraqi Journal Of Science

Joint Source-Channel Coding for Wireless Image Transmission based OFDM-IDMA Systems

OFDM-IDMA

Joint source-channel coding

Wireless image transmission

Salah.

Maha.

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The source and channel coding for wireless data transmission can reduce
distortion, complexity and delay in multimedia services. In this paper, a joint sourcechannel
coding is proposed for orthogonal frequency division multiplexing -
interleave division multiple access (OFDM-IDMA) systems to transmit the
compressed images over noisy channels. OFDM-IDMA combines advantages of
both OFDM and IDMA, where OFDM removes inter symbol interference (ISI)
problems and IDMA removes multiple access interference (MAI). Convolutional
coding is used as a channel coding, while the hybrid compression method is used as
a source coding scheme. The hybrid compression scheme is based on wavelet
transform, bit plane slicing, polynomi

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Publication Date

Mon Apr 02 2018

Journal Name

Al-nahrain Journal For Engineering Sciences (njes)

Output Feedback Adaptive Sliding Mode Control Design for a Plate Heat Exchanger

Plate Heat Exchanger

Adaptive sliding mode control

Sliding mode differentiator

Shibly Ahmed AL-Samarraie

Luma F. Ali

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The heat exchanger is a device used to transfer heat energy between two fluids, hot and cold. In this work, an output feedback adaptive sliding mode controller is designed to control the temperature of the outlet cold water for plate heat exchanger. The measurement of the outlet cold temperature is the only information required. Hence, a sliding mode differentiator was designed to estimate the time derivative of outlet hot water temperature, which it is needed for constructing a sliding variable. The discontinuous gain value of the sliding mode controller is adapted according to a certain adaptation law. Two constraints which imposed on the volumetric flow rate of outlet cold (control input) were considered within the rules of the proposed

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Publication Date

Mon Feb 28 2022

Journal Name

Journal Of Educational And Psychological Researches

Perceptual for enrolled and not enrolled the puplis in kindergartens (comparative study)

Perceptual

pupils

enrolled and not enrolled

kindergartens (comparative study)

Saba abd almonen almahfod

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Enrollment in kindergarten child accomplishes many positive aspects, that’s what Im sure a lot of modern educational trends in child education preschool in the importance of exposing children to a variety of sensory stimuli that contribute to impart a range of sound concepts.

Current research aims to know:

1.the level of sensory perception in the first primary grade students a sample search.

2.differences in perception of elementary first-graders with variable gender male, female)) 3.differences in perception of the first primary grade students attending and not attending kindergarten in accordance with variable attendance (attending, not attending).

school students (first grade) from attendi

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Publication Date

Sun Oct 01 2017

Journal Name

Journal Of The Faculty Of Medicine Baghdad

Pre-operative serum TSH level estimation for predicting malignant nodular thyroid disease

Prof Dr Basim

Kotaiba

Tharwat I Sulaiman

Hussein Ali

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Publication Date

Thu Dec 01 2016

Journal Name

Journal Of Economics And Administrative Sciences

Use the le'vy Model on stock returns for some Iraqi banks estimate

: Brownian motion

subordinate

Brownian subordinate

Normal Inverse Gaussian model (NIG)

الحركة البراونية

الأحداثي الجزئي

الأحداثي الجزئي ذو الحركة البراونية

أنموذج معكوس كاوس الطبيعي .

مناف يوسف

مريم جمعة

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In this article we study a single stochastic process model for the evaluate the assets pricing and stock.,On of the models le'vy . depending on the so –called Brownian subordinate as it has been depending on the so-called Normal Inverse Gaussian (NIG). this article aims as the estimate that the parameters of his model using my way (MME,MLE) and then employ those estimate of the parameters is the study of stock returns and evaluate asset pricing for both the united Bank and Bank of North which their data were taken from the Iraq stock Exchange.

which showed the results to a preference MLE on MME based on the standard of comparison the average square e

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