Preferred Language
Articles
/
JRbKtIcBVTCNdQwCSV1t
The influence of temperature and size on the absorption coefficient of CdSe quantum dots
...Show More Authors
Abstract<p>Because of Cadmium selenide quantum dots (CdSe quantum dots) has a tuning energy gap in the visible light range, therefore; it is provided a simple theoretical model for the absorption coefficient of CdSe quantum dots, where the absorption coefficient determines the extent to which the light of a material can penetrate a specific wavelength before it is absorbed. CdSe quantum dots have an energy gap can be controlled through two effects: the temperature and the dot size of them. It is found that; there is an absorption threshold for each directed wavelength, where CdSe quantum dots begin to absorb the visible spectrum at a size of 1.4 nm at room temperature for a directed wavelength 300 nm. It has been observed that; when the wavelength is increasing its absorption threshold is increased. For wavelengths (400, 500, 600) nm, the absorption thresholds for each quantum sizes are (1.8, 2.2. 3.2)nm respectively. On the other hand, a rising of the temperature led to reduces the absorption coefficient value, that at 400 K for all quantum sizes, the absorption coefficient increases >2000cm<sup>−1</sup>(According to the directed wavelength) than it is at 0 K. CdSe quantum dots can be considered as one of the most promising materials because it has a tuning gap for the visible wavelengthsfor different applications, such as light-emitting diodes in different colors of the visible spectrum. It is found that; there is a good agreement between our theoretical calculations and experimental results.</p>
Crossref
View Publication
Publication Date
Sat Jan 01 2022
Journal Name
International Journal Of Management And Enterprise Development
Studying The Decision-Making State and Impact in Iraqi Construction Projects
...Show More Authors

View Publication
Crossref
Publication Date
Sat Dec 01 2012
Journal Name
Journal Of Economics And Administrative Sciences
Public sector in Iraq Transition and partnership with the private sector
...Show More Authors

  The role of the public sector- Investment customizations-  economic embargo -  The role of the private sector - Coexistence between the public and private sectors -   Ratio of growth

View Publication
Crossref
Publication Date
Sat Jan 01 2022
Journal Name
1st Samarra International Conference For Pure And Applied Sciences (sicps2021): Sicps2021
Consequences for the groups 𝒮𝓛(2,𝒰), 𝒰 = 23 and 29
...Show More Authors

View Publication
Scopus (13)
Crossref (1)
Scopus Crossref
Publication Date
Sat May 16 2009
Journal Name
Journal Of Planner And Development
Information technology and replacement system in decision-making in the city
...Show More Authors

IT has its impact on all aspects of life, including its planning and operations. Based on the assumption that the plan can adapt any technique as an analytical tool within broader dimensions to include society in general and meet the requirements of that society. They have neutral values, meaning and usefulness rather than being adopted as abstract goals or objectives so that the planner or the decision-maker can benefit greatly from them. This information technology is summarized in three main axes: First: Geographic Information Systems. Second: computer modeling. Third: visual simulation and the Internet. The problem of research is that the decision-making environment of the plan is surrounded by uncertain information-planning conditio

... Show More
View Publication Preview PDF
Publication Date
Tue Oct 01 2024
Journal Name
E3s Web Of Conferences
The land transport efficiency in Wasit Governorate: Urban and rural settlements
...Show More Authors

The study of human factors and the extent of their impact on the construction of land transport roads is of great importance because they are variable factors, which are on the contrary natural factors, and the impact of human factors on road construction operations is evident through the study of population distribution and size, and economic activities (agricultural, industrial, tourism). And its direct mutual relationship with the construction and extension of land transport routes and the development of each of them, and then directing them to serve urban and rural human settlements, which leads to their development and improvement of their economic, living and social conditions on the one hand, and contributes to the emergence

... Show More
View Publication
Crossref
Publication Date
Thu Sep 01 2016
Journal Name
Current Pharmaceutical Design
Dry Eye Disease: Present Challenges in the Management and Future Trends
...Show More Authors

View Publication
Scopus (43)
Crossref (45)
Scopus Clarivate Crossref
Publication Date
Sat Jan 01 2022
Journal Name
Aip Conference Proceedings
Determine the hazard level and biological effects for visible laser pointers
...Show More Authors

View Publication
Scopus (2)
Scopus Crossref
Publication Date
Mon Jul 01 2019
Journal Name
Journal Of Educational And Psychological Researches
The Impact of Strategy 3-2-1 in acquiring Concepts of Sociology of fourth grade students: The Impact of Strategy 3-2-1 in acquiring Concepts of Sociology of fourth grade students
...Show More Authors

 

Abstract

The current research aims to identify the impact of triangular bridging strategy in the acquisition of sociology of fourth-stage students. To achieve the research objective, the following null hypotheses were adopted: there are no statistically significant differences at a significance level (0, 05) between the average grades of the experimental group students who studied the triangular bridging strategy in acquiring concepts of sociology and average grades of the control group. The researcher has selected the fourth-stage students from Alexandronah School for girls that s related to the Directorate General of Baghdad the sample consisted of (87) students at litera

... Show More
View Publication Preview PDF
Publication Date
Thu Jan 10 2019
Journal Name
Journal Of The College Of Education For Women
The goal orientations for the university students
...Show More Authors

The learner has face difficult in learning if not accompanied by strong motivation and directed towards the goals that set for himself,as the type of goals set by the learner for himself is behind the difference in achievement of the tasks and levels of learning, and these goals are directed and determine his behavior Academic in the way of his study and his direction towards the lecture and colleagues.

Current research aims:

  • Build tools for thegoal orientations
  • Measuring the goal orientations for the university studentsaccording to variables (type/class/specialization).

In order to achieve the objectives of the research, a tool was constructed for the (the Goal orientation), and the psych

... Show More
View Publication Preview PDF
Publication Date
Sun Feb 03 2019
Journal Name
Journal Of The College Of Education For Women
The U.S.A strategy in the red sea
...Show More Authors

0

View Publication Preview PDF