Parabola Dish and Cassegrain Concentrators to Improve Solar Cell Conversion Efficiency

Ali.H AL-Hamdani; Batool.D. Blawa; S.K AL-Ani

doi:10.21123/bsj.2011.8.2.571-576

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Publication Date

Sun Jun 12 2011

Journal Name

Baghdad Science Journal

Volume

8

Issue Number

2

DOI

10.21123/bsj.2011.8.2.571-576

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Parabola Dish and Cassegrain Concentrators to Improve Solar Cell Conversion Efficiency

Solar energy

Luminescent

Fresnel and Hybrid concentrators.

Ali.H AL-Hamdani

Batool.D. Blawa

S.K AL-Ani

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New designs of solar using ray tracing program, have been presented for improved the performance and the out put power of the silicon solar cell, as well as reducing the cost of system working by solar energy. Two dimensional solar concentrator (Fresnel lenses) and three dimensional concentrators (parabola dish and cassegrain) were used as concentrator for photovoltaic applications (CPV). The results show that the performance efficiency and out power for crystalline silicon solar cells are improved.

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Publication Date

Sat Dec 01 2012

Journal Name

Journal Of Engineering

Different Resolution Merging Methods For Environmental Areas Extraction

Environmental Areas

Resolution merge

High Pass Filter method

PCA

Visual inspection and statistical comparison.

Husham Abd Munaf

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The usage of remote sensing techniques in managing and monitoring the environmental areas is increasing due to the improvement of the sensors used in the observation satellites around the earth. Resolution merge process is used to combine high resolution one band image with another one that have low resolution multi bands image to produce one image that is high in both spatial and spectral resolution. In this work different merging methods were tested to evaluate their enhancement capabilities to extract different environmental areas; Principle component analysis (PCA), Brovey, modified (Intensity, Hue ,Saturation) method and High Pass Filter methods were tested and subjected to visual and statistical comparison for evaluation. Both visu

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(1)

Publication Date

Sun Mar 06 2016

Journal Name

Baghdad Science Journal

The Nuclear Structure for Exotic Neutron-Rich of 42, 43, 45,47K Nuclei

"Exotic nucleus

proton

neutron and matter density

magnetic dipole moments

elastic magnetic form factors"

Ban S.

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In this paper the proton, neutron and matter density distributions and the corresponding root mean square (rms) radii of the ground states and the elastic magnetic electron scattering form factors and the magnetic dipole moments have been calculated for exotic nucleus of potassium isotopes K (A= 42, 43, 45, 47) based on the shell model using effective W0 interaction. The single-particle wave functions of harmonic-oscillator (HO) potential are used with the oscillator parameters b. According to this interaction, the valence nucleons are asummed to move in the d3f7 model space. The elastic magnetic electron scattering of the exotic nuclei 42K (J?T= 2- 2), 43K(J?T=3/2+ 5/2), 45K (J?T= 3/2+ 7/2) and 47K (J?T= 1/2+ 9/2) investigated t

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(1)

Publication Date

Thu Jan 02 2020

Journal Name

Journal Of The College Of Languages (jcl)

The Problem of Translating Antonyms in The Holy Qur’an into German’’, in an analytical manner: Das Übersetzungsproblem der Antonyme im Heiligen Koran ins Deutsche Analytische Studie

opposition

translation

meaning

interpretation

and difference of opinions

Anatomie

Übersetzung

Bedeutung

Interpretation und Meinungenunterschied

Hilal Abdul Hamza

Abdulnassir Neamah

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The present study is entitled “Problems of Translating Holy Qur’an Antonyms into German: An Analytical Study”. It discusses some of the problems of translating Holy Qur’an verses that contain words so opposite in meaning to another word. The main concern of the study stresses some of the errors in translating the oppositeness of certain words of Holy Qur’an from Arabic into other languages like German, a problem that can be traced back to the fact that such words may have two opposites in meaning, one is considered and the other is completely neglected.

The errors in translating al Qur’an Antonyms can be summarized for several reasons: literal translation, ignorance of the different view

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Publication Date

Thu Feb 02 2012

Journal Name

Education College Journal/al-mustansiriyah University

On Significance Testimator in Pareto Distribution Via Shrinkage Technique

Pareto Distribution

Shrinkage Estimation

Preliminary Test Region

Bias

Mean Squared Error and Relative Efficiency.

Maha

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In this paper, preliminary test Shrinkage estimator have been considered for estimating the shape parameter α of pareto distribution when the scale parameter equal to the smallest loss and when a prior estimate α0 of α is available as initial value from the past experiences or from quaintance cases. The proposed estimator is shown to have a smaller mean squared error in a region around α0 when comparison with usual and existing estimators.

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Publication Date

Tue May 01 2018

Journal Name

Journal Of Engineering

Prediction of the Effect of Using Stone Column in Clayey Soil on the Behavior of Circular Footing by ANN Model

stone column

circular footing

ground improvement

artificial neural network

bending moment

and shear forces.

Omar Khaleel Ismael

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Shallow foundations are usually used for structures with light to moderate loads where the soil underneath can carry them. In some cases, soil strength and/or other properties are not adequate and require improvement using one of the ground improvement techniques. Stone column is one of the common improvement techniques in which a column of stone is installed vertically in clayey soils. Stone columns are usually used to increase soil strength and to accelerate soil consolidation by acting as vertical drains. Many researches have been done to estimate the behavior of the improved soil. However, none of them considered the effect of stone column geometry on the behavior of the circular footing. In this research, finite ele

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(3)

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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Publication Date

Sun Jan 01 2012

Journal Name

Journal Of Computing

Fibrewise Near Topological Spaces

Fibrewise topological spaces

Fibrewise near topological spaces

Fibrewise near closed and near open topological spaces.

A. A.

S. S.

Y. Y.

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In this paper we define and study new concepts of fibrewise topological spaces over B namely, fibrewise near topological spaces over B. Also, we introduce the concepts of fibrewise near closed and near open topological spaces over B; Furthermore we state and prove several Propositions concerning with these concepts.

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Publication Date

Thu Sep 30 2004

Journal Name

Iraqi Journal Of Chemical And Petroleum Engineering

Corrosion Inhibition of Steel Reinforcement in Concrete

corrosion of steel

Pomegranate husk and tannate

% inhibition

Chemical inhibitors

IR-drop term

concrete resistance

Aprael S.

Baha'a G.

Noora R.

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Publication Date

Wed Oct 15 2014

Journal Name

International Journal Of Advanced Research

A survey/ Development of Passive Optical Access Networks Technologies

Passive Optical Network

Time Division Multiple Access

Wavelength Division Multiplexing and Orthogonal Frequency Division Multiplexing.

Nahlah Abdulrahman

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The bandwidth requirements of telecommunication network users increased rapidly during the last decades. Optical access technologies must provide the bandwidth demand for each user. The passive optical access networks (PONs) support a maximum data rate of 100 Gbps by using the Orthogonal Frequency Division Multiplexing (OFDM) technique in the optical access network. In this paper, the optical broadband access networks with many techniques from Time Division Multiplexing Passive Optical Networks (TDM PON) to Orthogonal Frequency Division Multiplex Passive Optical Networks (OFDM PON) are presented. The architectures, advantages, disadvantages, and main parameters of these optical access networks are discussed and reported which have many ad

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Publication Date

Sun Dec 02 2012

Journal Name

Baghdad Science Journal

Stability of Back Propagation Training Algorithm for Neural Networks

" BP training algorithm

Ann

Gradient Descent Training Algorithm

Gradient Descent with Momentum and Lyapunov Stability ."

Luma. N. M.

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In this paper, we derive and prove the stability bounds of the momentum coefficient µ and the learning rate ? of the back propagation updating rule in Artificial Neural Networks .The theoretical upper bound of learning rate ? is derived and its practical approximation is obtained

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