A random laser is a non-conventional laser whose feedback mechanism is based on dissorder-induced light. However, random lasers occur in gain media with numerous scatterers and produce coherent laser emission without any predesigned cavity. The generation of coherent emission from multiple scattering is quite general and its basic principles are shown here using sulforhodamine B-TiO suspensions system. These suspensions were pumped with 337.1 nm pulses from N2 laser and the spectral and temporal behavior of light emitted from the pumped surface was recorded. When we pump power above a certain threshold a dramatic narrowing of the emission line width and a shortening of the emitted pulses were observed. We have experimentally found that in a random laser based scattering, the threshold pumping density decreases with pump energy increased.
Abstract
This work deals with a numerical investigation to evaluate the utilization of a water pipe buried inside a roof to reduce the heat gain and minimize the transmission of heat energy inside the conditioning space in summer season. The numerical results of this paper showed that the reduction in heat gain and energy saving could be occurred with specific values of parameters, like the number of pipes per square meter, the ratio of pipe diameter to the roof thickness, and the pipe inlet water temperature. Comparing with a normal roof (without pipes), the results indicated a significant reduction in energy heat gain which is about 37.8% when the number of pipes per m
... Show MoreThe river "Al Khawser" has a significant role in the history of civilization of Nineveh city in north of Iraq that makes studying river channel and previous geomorphological analysis with its relation to the political and economical in the city in the ancient history depending on remote sensing technology with aerial imagery interpretation because it is easily available, multiple use, engineered integration, and low cost compared to other technology, this paper discovered that the current channel of river "Al Khawaser" is not the real old path
تأملات في الاطر العامة والخاصة للفكر السياسي في ليبيا القديمة
Dialogue is one of the basic data of human existence where we find religious, civilizational, educational, and cultural dialogue, and all of these types require interaction with the other that is intellectually, socially, or religiously different. It is the only way through which contact is made between individuals, groups, peoples, and states, and through dialogue, societies get advanced. Dialogue is extremely important in clarifying the true image that resides in the thought of the other side, especially that purposeful scientific dialogue in which the interlocutors are free from fanaticism and extremism. The current study aims to identify the importance of dialogue, conditions for constructive dialogue, types of dialogue, The importan
... Show MoreThe purpose of the description of the source in some grammarians is exaggeration, and many examples in the Koran, it is news of the source about the self, the Almighty says: What the Kufa gurus used to direct the description of the source on the interpretation of the derivative, and Basrah on the added estimate. The ancients and modernists agreed on the importance of the context of the sentence and its effect in raising the ambiguity, determining the meaning, and not content with the manifestation of the word and its connotations in isolation from the denominator. Raising and erecting in the adjective "means that the prescribed is known as a known fact or claim.
المعارضة في الاسلام
في المعادلة السياسية
I dealt with this study of one of the hadiths of the Prophet and judged him after studying his deed, especially one of his narrations for the similarity in his name and the name of his father (Abdul Rahman bin Ishaq) Is he a civil "Sadok" or Wasti "weak" and they are in one layer which is called in the science of Hadith (agreed And after a review of Kutkut translations and wound and amendment and other evidence and evidence that it was "weak" and not as he went to him and asserted by the updated Muhammad Nasser al-Din al-Albani may God have mercy on him that in Sindh is a civil rule for the hadeeth "Hassan" and not as said The hadeeth is “weak” because he showed that it is the weak Wasti.
I ask God to be successful in this work an
The experiment was carried out in the green house of botanical garden belong to Department of Biology/College of Education for Pure Science- Ibn–al- Haitham/University of Baghdad, for the growth season 2015 using plastic pots. The experiment aimed to study the effect of two concentrations of sodium chloride (50, 100) mM.L-1 in addition to the control and four concentrations of kinetin (25, 50, 75, 100) mg.L-1 in addition to the control and the influence of application and non application of fertilizlizer NPKZn in the level 160 kg.h1- and their interactions on some growth parameters (fresh weight for both root and vegetative part, dry weight for leaves , value of secondary productivity, biomass duration for vegetative part and dry weight f
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Powder extracts hot water from local ground beef and studied inhibitory effectiveness of powder and extracts to the concentration of the aqueous extract hot Gulf students