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

Wed Oct 01 2014

Journal Name

Journal Of Economics And Administrative Sciences

Building standardized Growth Curves for Iraqi Children Under Five Years

Centile

LMSP Method

Box-Cox Distribution

General Additive model for location scale and shape.

خلود يوسف

احمد

...Show More Authors

The growth curves of the children are the most commonly used tools to assess the general welfare of society. Particularity child being one of the pillars to develop society; through these tools, we can path a child's growth physiology. The Centile line is of the important tools to build these curves, which give an accurate interpretation of the information society, also respond with illustration variable age. To build standard growth curves for BMI, we use BMI as an index. LMSP method used for finding the Centile line which depends on four curves represents Median, Coefficient of Variation, Skews, and Kurtosis. These can be obtained by modeling four parameters as nonparametric Smoothing functions for the illustration variable. Ma

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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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(2)

Publication Date

Fri May 15 2026

Journal Name

Al–bahith Al–a'alami

Audiences Atitudes tworads environmental issues in the public broadcasting service

Public Broadcasting Service - Environment and Life Program - Iraqi satellite channel - Iraqi Ministry of Environment

Shukry

Irada

...Show More Authors

The category of those who agree with the phrase: The Environment and Life Program warns me of the environmental damages resulting from the issue of using black oil in electrical generators in residential neighborhoods came first, with a high rate of 81.4%. With the environment, the public always turns to the public broadcasting service and its programs to provide knowledge so that it can avoid it. Thus, the respondents' attitude towards this issue was positive.

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Publication Date

Wed Dec 30 2020

Journal Name

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

Assessment of Quality of Life in a Sample of Iraqi Patients with Psoriasis.

Psoriasis

Iraq

Dermatology life quality index

Quality of life

Psoriasis area and severity index.

Sarah

Dheyaa

Sarmad

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Psoriasis is a dermatological, chronic, immune-mediated condition. Psoriasis symptoms are not associated with physical burden only, but it may also have psychosocial effects on patients, diminished cognitive control, poor body image and impairments in everyday life. The value of quality of life is important since improving it is the principal goal for non-curative disease. The aim of the current study was to evaluate quality of life in a sample of Iraqi patients with psoriasis. This study is a cross-sectional study that involved 300 already diagnosed psoriasis patients who attended to the center of Dermatology and Venereology, Medical City/Baghdad. The mean age of patients was (35.156 ±10.549 years). The Arabic version of Dermatology Li

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(11)

(6)

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.

...Show More Authors

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

...Show More Authors

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.

...Show More Authors

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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Publication Date

Thu Sep 02 2021

Journal Name

Journal Of Al-frahedis Arts

Public Relations Activities in Iraqi Industrial Companies

Public Relations

Industrial Companies

Iraqi Companies

Iraqi Industrial

Food product Companies

Textiles and Leather Companies.

Ahmed R.Q.

Ahmed Khalaf

...Show More Authors

Due to the impact of industrial companies on the ransformations and developments witnessed by the world in general nd Iraq in particular, especially in the industrial and economic Jonrnal spects, the liberalization of internal and external trade, and the idoption of the open market policy in Iraq, which led to the intensification of competition between industrial companies and heir products and services, and the increase and diversity of the Onumber of alternatives Available to the public on the one hand, and he diversity and change of their desires and needs on the other hand, which was reflected in the reality of those companies and heir products or services, especially in light of the great challenges facing companies and the deteriorat

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