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Publication Date
Tue Jan 18 2022
Journal Name
Heat Transfer
Volume
51
DOI
10.1002/htj.22406
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Scopus (17)
Crossref (11)
Articles
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duYIaJwBmraWrQ4dnklp
Effect of receiver geometry on the optical and thermal performance of a parabolic trough collector
channel receiver
optical efficiency
parabolic trough collector
rays distribution
receiver geometry
thermal efficiency
uniformity factor
Mustafa J. Al‐Dulaimi
Karima E. Amori
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Abstract<p>In this study, the optical and thermal performance of a Parabolic Trough Collector PTC system is investigated theoretically. A series of numerical simulations and theoretical analysis has been conducted to investigate the effect of the receiver geometry and location relative to the focal line on its optical performance. The examined receiver geometries are circular, square, triangular, elliptical and a new design of circular‐ square named as channel receiver. The thermal performance of PTC is studied for different flow rates from (0.27 to 0.6 lpm) theoretically. Results showed that the best optical design is the channel receiver with an optical efficiency of 84% while the worst is the elliptical receiver with an optical efficiency of 70%. Thermally the best design is the elliptical receiver with a thermal efficiency of 85% while the worst is the circular receiver with a thermal efficiency of 82%.</p>
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Publication Date
Sun Jun 01 2014
Journal Name
Journal Of Economics And Administrative Sciences
Different Methods for Estimating Location Parameter & Scale Parameter for Extreme Value Distribution
Extreme Value Distribution
Maximum likelihood estimator
Method of moment Estimators
Estimators based on Percentiles
Least Squares estimators
Weighted Least Squares estimators
Ridge regression estimators
Adjusted Ridge regression estimators.
جنان عباس
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      In this study, different methods were used for estimating location parameter  and scale parameter for extreme value distribution, such as maximum likelihood estimation (MLE) , method of moment  estimation (ME),and approximation  estimators based on percentiles which is called white method in estimation, as the extreme value distribution is one of exponential distributions. Least squares estimation (OLS) was used, weighted least squares estimation (WLS), ridge regression estimation (Rig), and adjusted ridge regression estimation (ARig) were used. Two parameters for expected value to the percentile  as estimation for distribution f

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Crossref
Publication Date
Mon Jun 05 2023
Journal Name
Journal Of Economics And Administrative Sciences
Fuzzy Bridge Regression Model Estimating via Simulation
Fuzzy linear regression
Fuzzy least squares method
Fuzzy Bridge regression
multicollinearity
triangular fuzzy numbers
Variance Inflation Factor.
الانحدار الخطي الضبابي
طريقة المربعات الصغرى الضبابية
انحدار الجسر الضبابي
التعدد الخطي
الأرقام الضبابية المثلثية
عامل تضخم التباين.
Rawya
Mohammed
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      The main problem when dealing with fuzzy data variables is that it cannot be formed by a model that represents the data through the method of Fuzzy Least Squares Estimator (FLSE) which gives false estimates of the invalidity of the method in the case of the existence of the problem of multicollinearity. To overcome this problem, the Fuzzy Bridge Regression Estimator (FBRE) Method was relied upon to estimate a fuzzy linear regression model by triangular fuzzy numbers. Moreover, the detection of the problem of multicollinearity in the fuzzy data can be done by using Variance Inflation Factor when the inputs variable of the model crisp, output variable, and parameters are fuzzed. The results were compared usin

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Crossref (2)
Crossref
Publication Date
Mon Jan 01 2024
Journal Name
Anais Da Academia Brasileira De Ciências
Morphological study for Accipitrid birds (Accipitridforms, Accipitridae) in Iraq; part two
A part two of Accipitridae Family members that belong to three genera: Circus
Gyps
and Neophron were documented as morphometrics
distribution ranges
and conservation status were reviewed and comprehensively discussed. A total of 29 voucher specimens belong to six species which are conserved in the “Iraq Natural History Research Center and Museum INHM” as follow: Marsh Harrier Circus aeruginosus (Linnaeus
1758)
Hen Harrier Circus cyaneus (Linnaeus
1766)
Montagus Harrier Circus pygargus (Linnaeus
1758)
Pallid Harrier Circus macrourus (Gmelin
1770)
Egyptian vulture Neophron percnopterus (Linnaeus
1758)
and Griffon vulture Gyps fulfus (Hablitz
1783). The results revealed significant criteria about near threatened NT species IUCN and Birdlife International listed as Pallid Harrier Circus macrourus
and Endangered (EN) species as Egyptian vulture Neophron percnopterus globally decreasing population trend.
HIND D.
KHALIDA I.
AFKAR M.
SUHAD Y.
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