Pulse Profile Rule in Laser Heating of Opaque Targets in Air

Bassam H.  Habib

doi:10.21123/bsj.2011.8.3.756-765

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Publication Date

Sun Sep 04 2011

Journal Name

Baghdad Science Journal

Volume

8

Issue Number

3

DOI

10.21123/bsj.2011.8.3.756-765

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Pulse Profile Rule in Laser Heating of Opaque Targets in Air

A theoretical model is developed to determine time evolution of temperature at the surface of an opaque target placed in air for cases characterized by the formation of laser supported absorption waves (LSAW) plasmas. The model takes into account the power temporal variation throughout an incident laser pulse

(i.e. pulse shape

or simply: pulse profile). Three proposed profiles are employed and results are compared with the square pulse approximation of a constant power.

Bassam H. Habib

...Show More Authors

A theoretical model is developed to determine time evolution of temperature at the surface of an opaque target placed in air for cases characterized by the formation of laser supported absorption waves (LSAW) plasmas. The model takes into account the power temporal variation throughout an incident laser pulse, (i.e. pulse shape, or simply: pulse profile).
Three proposed profiles are employed and results are compared with the square pulse approximation of a constant power.

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Publication Date

Sat Aug 31 2019

Journal Name

Iraqi Journal Of Physics

The Effect of Laser And Thermal Treatment on the Hardness and Adhesion Force on the Cermet Coating By Thermal Spray Technique

Thermal spraying flame

thermal tretment

laser tretment

ceramic materiale

Ahmed Abd

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Ceramic coating compose from a ceramic mixture (MgO, Al₂O₃) and metall (Al-Ni) were produced by Thermal Spray Technique. The mixed ratio of used materials Al:Ni (50%) and 40% of Al₂O₃ and 10% MgO. This mixture was spray on a stainless steel substrate of type (316 L) by using thermal spray with flame method and at spraying distances (8, 12, 16 and 20) cm, then the prepared films were treated by laser and thermal treatment. After that performing a hardness and adhesion tests were eximined. The present study shows that the best value of the thermal treatment is 1000 ℃ for 30 mint; the optimum spray distance is 12 cm and most suitable laser is 500 mJ where the microscopic and mechanical character

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(1)

Publication Date

Sun Jun 01 2014

Journal Name

Baghdad Science Journal

Simulation Study on Optically Designed Refractive Beam Expander for Nd: YAG Laser Harmonics for 7 Km Detection Range

Beam Expander

Laser

Spot Size

Expansion Ratio

Galilean

Keplerian.

Hisham A.

Assma A.

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The simulation study has been conducted for the harmonics of Nd: YAG laser, namely the second harmonic generation SHG, the third harmonic generation THG, and the fourth harmonic generation FHG. Determination of beam expander's expansion ratio for specific wavelength and given detection range is the key in beam expander design for determining minimum laser spot size at the target. Knowing optimum expansion ratio decreases receiving unit dimensions and increases its performance efficiency. Simulation of the above mentioned parameters is conducted for the two types of refractive beam expander, Keplerian and Galilean. Ideal refractive indices for the lenses are chosen adequately for Nd: YAG laser harmonics wavelengths, so that increasing transm

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Publication Date

Tue Jan 08 2019

Journal Name

Iraqi Journal Of Physics

Study of structural, optical and electrical properties of thin Ag2Cu2O4 films prepared by pulsed laser deposition

Ag-Cu-O films

structure and morphological properties

optical properties

electrical properties.

Iqbal S.

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The influence of sintering and annealing temperatures on the structural, surface morphology, and optical properties of Ag2Cu2O4 thin films which deposited on glass substrates by pulsed laser deposition method have been studied. Ag2Cu2O4 powders have polycrystalline structure, and the Ag2Cu2O4 phase was appear as low intensity peak at 35.57o which correspond the reflection from (110) plane. Scan electron microscopy images of Ag2Cu2O4 powder has been showed agglomerate of oxide particles with platelets shape. The structure of thin films has been improved with annealing temperature. Atomic Force micrographs of Ag2Cu2O4 films showed uniform, homogenous films and the shape of grains was almost spherical and larger grain size of 97.85 nm has o

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Publication Date

Sat May 31 2025

Journal Name

3rd International Scientific Conference For Human And Social Studies And Epistemological Challenges

Frankenstein Complex in Daniel H. Wilson's Robopocalypse ( ): Artificial Intelligence Conspiracies

With the advent of technology

the fear of losing control has consistently accompanied humanity. While humans have discovered

invented

and created many remarkable things

they have also been haunted by the possibility of their creations turning against them. This fear

often referred to as the Frankenstein Complex

derives its name from Mary Shelley's Frankenstein (􀀔􀀛􀀔􀀛)

in which Dr. Frankenstein's creation ultimately destroys its maker. The Frankenstein Complex embodies the subconscious fear of artificial intelligence (AI) surpassing and potentially dominating humankind. This apprehension has inspired numerous literary works

including Daniel H. Wilson’s novels. The present study examines the widespread fear of AI

which has fueled conspiracy theories in literature. These theories have not only amplified public anxiety but also hindered understanding among those with limited knowledge of AI and robotics. Dr. Wilson

a robotics expert

uses his imagination as a driving force for both his writing and his inventions. The research focuses on incidents leading to the rise of robots

the concept of the New War

how it was fought

and how it concluded. By comparing

contrasting

and analyzing literary elements and devices with prominent conspiracy theories

the study highlights the interplay between fiction and scientific development. The researchers conclude that while many conspiracy theories contain elements of truth

they often inspire scientists to explore them further. Additionally

some conspiracy theories warrant serious consideration. The study recommends acknowledging the Frankenstein Complex while maintaining faith in the potential benefits of artificial intelligence.

Ansam

Mayada

Zahraa

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Publication Date

Sun Jan 02 2022

Journal Name

Journal Of The College Of Languages (jcl)

Song and motivation in language class: Chanson et motivation en classe de langue

The song in the classroom

motivation

teaching of French as a foreign language

chanson en classe

motivation

apprentissage de FLE.

Khaldoon Atta

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Songs are considered as an educational and a substantial dependable references used in teaching and learning, particularly the so - called foreign language learning that allows learners to adapt to the target language culture and to develop their language learning skills including: listening comprehension, reading comprehension, speaking and writing. Consequently, it can be said that the Francophone songs with the musical richness and resonance specifically facilities French language learning skills for all levels of education and achieve short and long terms predetermined educational language learning goals.

In fact, language learning through songs method does not only include the

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Publication Date

Fri Dec 15 2023

Journal Name

مجلة آداب المستنصرية

(Semantic expansion in the Arabic system)

context

all of which are required semens.

Muayad Abdul Jabbar Khudair

A.M.D. Muayad Abdul Jabbar Khudair

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The principle in the language is that each word has one meaning. This is because the purpose of language development is for understanding, understanding, and communication between people. The language is sounds with which each people expresses their Arabic language did not stop at this point, but rather needed another next stage or to convey additional features or characteristics that would qualify it. To be the language of the Qur’an and revelation, and capable of carrying this heavy burden.

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Publication Date

Wed Jun 01 2011

Journal Name

Journal Of Economics And Administrative Sciences

The role of the cognitive peak and its implications for achieving outstanding performanceAnalytical study of the views of a sample of the staff of the University of Baghdad

الاء نبيل

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Knowledge represents the foundation stone for the work of all organizations, are working who leads the thinking of individuals is the ability that leads to behavior based on rationality, it is the work that creates value to the organization and thus gain access to performance winning where that knowledge is a new type of capital based on the thought and experience and is the so-called intellectual capital, which is renewable and is constantly evolving. The study sought to explain the role of the climax knowledge in achieving the highest levels of performance Organizational and then access to the performance winning in educational organizations the study sample, was found to be a co

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Publication Date

Sun Apr 03 2011

Journal Name

Journal Of Educational And Psychological Researches

Satisfy of life and it's relationship; with the bige factors of character in the university student

Satisfy of life bige factors of character

the university student

سهام كاظم نمر

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This research aim to recognize
satisfy of life in the university's student and balance in satisfy of life
according to two type aveirable sex specific and find type and
relationship's director between satisfy of life and character big factors.
and known hom much that Factors in satisfy of life, the research sample
consist of (401) student male and female and from both specified in
Baghdad's University, researcher bult scale of Costa &McCrae Fore the
fire big Factors to Personality, research result That the university's
student low level of satisfy of life and there are no different statically if
they are scientific or human in their study. And there is positive and there
is positive and indicate relation

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Publication Date

Tue Dec 13 2005

Journal Name

Iraqi Journal Of Laser

Warts Treatment by 810 nm Diode Laser Irradiation: A New Approach

Jamal J. I.

...Show More Authors

The present work was done in an attempt to build systematic procedures for treating warts by 810 nm diode laser regarding dose parameters, application parameters and laser safety. The study was done in Al- Kindy Teaching Hospital in Baghdad, Iraq during the period from 1st October 2003 till 1st April 2004. Fifteen patients completed the treatment and they were followed for the period of 3 months. Recalcitrant and extensive warts were selected for the study. Patients were randomly divided into 3 groups to be treated by different laser powers 9, 12 and 15 W, power density of 286 W/cm2, 381W/cm2, 477 W/cm2 pulse duration of 0.2 s, interval of 0.2 s and repeated pulses were used. The mode of application was either circular or radial. Pain oc

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Publication Date

Wed Dec 30 2009

Journal Name

Iraqi Journal Of Physics

Preparation ultra fine particles from Ceramic refractory material using CO2 Laser

Cadmium sulphide Hetrojunction

Tarik Talib

...Show More Authors

S a mples of compact magnesia and alumina were evaporated
using CO2-laser .The
Processed powders were characterized by electron microscopy
and both scanning and transmission electron microscope. The results
indicated that the particle size for both powders have reduced largely
to 0.003 nm and 0.07 nm for MgO and Al2O3, with increasing in
shape sphericity.

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