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Performance Evaluation of Small Scale Air-Conditioning System Using R22 and Alternative Refrigerants
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A mathematical model has been formulated to predict the influence of high outdoor air temperature on the performance of small scale air - conditioning system using R22 and alternative refrigerants R290, R407C, R410A. All refrigerants were investigated in the cooling mode operation. The mathematical model results have been validated with experimental data extracted from split type air conditioner of 2 TR capacity. This entailed the construction of an experimental test rig which consists of four main parts. They are, the refrigeration system, psychrometric test facility, measuring instrumentation, and auxiliary systems. The conditioned air was maintained at 25 0C dry bulb and 19 0C wet bulb for all tests. The outdoor ambient air temperature was varied from 35 0C to 55 0C in 5 0C increments. The study showed that R290 is the better replacement for R22 when the air conditioning system works under high ambient temperature. It has better performance as a drop in refrigerant. R407C has the closest performance to R22, followed by R410A.

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Publication Date
Mon Feb 04 2019
Journal Name
Journal Of The College Of Education For Women
Yacoub Ben Keles, the First of the Fatimid Ministers ( 368-380 A.H. / 978-990 A.D. )
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Minister Yacoub Ben Keles distinguished himself with leadership and administrative talents, as well as his abilities in the field of jurisprudence, which made him the top political, administrative and cultural scene of the Fatimid state and left its mark on it by influencing its fateful decisions.
He was the son of Kels of the Jews of Baghdad, where he learned writing and arithmetic, and moved with his father to Syria and then carried him to Egypt.
Egypt embraced the son of Kels, living in a transitional period from the Achaishid era to the Fatimid period. Both these two covenants reconciled this man to his career until he became minister in the Fatimids in 368 A.H. / 978 A.D.
His character was overshadowed by most of the state'

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Publication Date
Sun Dec 01 2024
Journal Name
Frontiers Of Nursing
A qualitative study to explain the criteria of nursing managers in selecting effective nursing diagnosis
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Abstract<sec> <title>Objective

This study aimed to explain the criteria of managers at different levels of nursing in selecting effective nursing diagnosis.

Methods

In conventional content analysis, 10 nursing managers at different levels including head nurse, supervisor, and nursing manager were interviewed. Data was collected with semi-structured interviews and a narrative approach. Data analysis was performed using the Zhang–Wildemuth method simultaneously with sampling.

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Publication Date
Thu May 25 2017
Journal Name
Genome Announcements
Complete Genome Sequence of Lytic Bacteriophage VPUSM 8 against O1 El Tor Inaba Vibrio cholerae
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ABSTRACT<p> The complete genome sequence of bacteriophage VPUSM 8 against O1 El Tor Inaba <named-content content-type="genus-species">Vibrio cholerae</named-content> is reported here. The isolated VPUSM 8 has potential use in future phage therapy or as a biocontrol agent for the prevention and treatment of cholera. </p>
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Publication Date
Fri Jul 01 2016
Journal Name
Journal Of Economics And Administrative Sciences
Determine the best model to predict the consumption of electric energy in the southern region
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Abstract:          

                Interest in the topic of prediction has increased in recent years and appeared modern methods such as Artificial Neural Networks models, if these methods are able to learn and adapt self with any model, and does not require assumptions on the nature of the time series. On the other hand, the methods currently used to predict the classic method such as Box-Jenkins may be difficult to diagnose chain and modeling because they assume strict conditions.

  

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Publication Date
Sun Mar 01 2009
Journal Name
Laser And Particle Beams
Surface morphology modifications of human teeth induced by a picosecond Nd:YAG laser operating at 532nm
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Publication Date
Thu Jun 01 2023
Journal Name
Australian Dental Journal
Debonding of LDSVs utilising Er,Cr:YSGG laser irradiation with fractional technique: an in vitro study
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Publication Date
Sat Jan 01 2022
Journal Name
Journal Of Al-farahidi's Arts
The Impact of Social Media on Customer Behavior - Survey Research for Tourism Companies in Baghdad
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The current research aims to diagnose the type and level of influence of social media, whose dimensions are represented by (attitudes towards social media marketing, knowledge and use of social media, influence on the Internet and social media, following up on social media) on customer behavior in its dimensions (attracting attention, raising Interest, desire creation, customer response), and the research sought to answer questions related to the research problem by testing the main hypotheses to explore correlations and influence between the two variables, and to achieve research hypothesis tests, the field study was used, as the research sample reached (135) individuals from the director and the assistant director And marketing personnel

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Publication Date
Sun Sep 30 2018
Journal Name
Scientific Journal Of Silesian University Of Technology. Series Transport
Measuring the relative importance of applying engineering solutions to urban traffic intersections: a planning perspective
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Publication Date
Tue Mar 01 2022
Journal Name
Iraqi Journal Of Applied Physics
Fluorescence Characteristics of Coated- Cell Dye Solutions Containing Highly Pure Nanoparticles as Random Gain Media
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In this work, enhancement to the fluorescence characteristics of laser dye solutions hosting highly-pure titanium dioxide nanoparticles as random gain media. This was achieved by coating two opposite sides of the cells containing these media with nanostructured thin films of highly-pure titanium dioxide. Two laser dyes; Rhodamine B and Coumarin 102, were used to prepare solutions in hexanol and methanol, respectively, as hosts for the nanoparticles. The nanoparticles and thin films were prepared by dc reactive magnetron sputtering technique. The enhancement was observed by the narrowing of fluorescence linewidth as well as by increasing the fluorescence intensity. These parameters were compared to those of the dye only and the dye solution

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Publication Date
Fri Jun 01 2018
Journal Name
Journal Of The College Of Languages (jcl)
A Critical Stylistic Analysis of the Ideological Positioning in Some Selected Poems by John Donne
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This paper deals with the ideological positioning of the English poet John Donne in a selected poems of his i.e Holy Sonnet X, as regards the theme of death found therein. The researchers adopt an emerging branch of stylistics, called Critical Stylistics, as proposed by Jeffries (2010) in order to uncover the ideologies of the author regarding the topic concerned and how linguistic choices are used to slant ideas. The model is comprised of ten tools of analysis which, upon being applied to the selected data, have shown how the poet exploits language resources in order to pass his ideology and influence his readers. In this paper, the workings of only one tool are presented as applied to a certain portion of the data.

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