In the present work, the fabrication techniques of type of Nd +3-glass laser active
media : namely, Neodymium- Tellurite glass, where the glass system(TeO2(1-x) - BaOZnO-
Nd2O3x) for values of (X=1,1.5,2,2.5,3,3.5 wt%) was used.
Measurements have been taken for the signal of fluorescence spectrum of Nd+3- glass
samples. The fluorescence spectrum, for one of the samples, has been taken, after the
sequences of polishing for the out surface.
The results give signal of fluorescence spectrum for the samples. Intensity of the peak of
the signal increases with Nd +3 concentration. The fluorescence at (l=1.06 mm) for one
of the samples has been detected and the fluorescence line width was (100 cm-1). The
cross section of stimulated emission for this type of laser active media (sp(lp=1.06
mm)=3.59*10-20 cm2), and the results compared with the published data.
Fencing is a sport where performance is affected by the evolutionof performance and capacity to assume (the speed and performance),and over the previous methods in the training with the development of(the speed and performance) on the fencing to be a solid surface suchas wood, aluminum, asphalt and in some halls have Altartan, thisrespect this method for long periods of time in Iraq, using exercisesthat are burdened with the development of force. For the moment theyhad been shown a recent trend in training, to see the football playersplay for Real Madrid training on the sand beach after eight minutes ofwarm-up training and jogging, and training on the properties of thesand to make the resistance of the body weight of the heaviest men inthe
... Show MoreIn this research, the effect of each of the concentrations ( Nd+3) was studied (N) the thickness of the thin disk (d) the number of times that the pumping beam passes through the effective medium of this laser (Mp) the reflectivity of the laser output mirror (R 2) The losses of the effective medium (L) and the pumping power used in achieving the reverse qualification (PP) on each of the pumping threshold capacities (Pp.th) and the output power of the laser (Pout) and the efficiency (ŋ) in Nd3+ thin-disk lasers (TDLs) pumping quasi-three-level With continuous operation (cw), at room temperature, and in the Gaussian mode (TEM00),
We found under these opera
... Show More
The study aimed to determine the impact of awareness of the exercisearm at the level of performance skill Tabtabp in basketball.Used the experimental approach to female students of the fourth stage(25) Ksmo students into two groups (experimental and officer) applied theempirical understanding of the arm exercises, during Tabtabp (to push theball) introduced in the main section of the application of the lesson and by(10) minutes and over the 8 weeks . Concluded that the awareness of thearm exercises a positive influence in the development of skill in basketballTabtabp of members of a sample search.It recommends that researchersfocus on understanding the exercise arm, especially during the lesson toupgrade the performance of skill.God bless
هدف البحث إلى إعداد منهاج بأسلوب تدريبات البلايومترک على الأسطح المائلة لتلائم متطلبات لعبة کرة االطائرة , فضلا عن التعرف على تأثير المنهاج في تطوير القوة الخاصة للإطراف السفلى بکرة الطائرة استعمل المنهج التجريبي على عينة من لاعبي المدرسة التخصصية الشباب بالکرة الطائرة والبالغ عددهم (14) لاعب، وبعد التأکد من تجانس عينة البحث في متغيرات (الطول والوزن والعمر الزمني), تم تقسيم العينة إلى مجموعتين تجريبية وضابط
... Show More
Laser cleaning of materials’ surfaces implies the removal of deposited pollutants without affecting the material. Nanosecond Nd:YAG pulsed laser, operating at 1064 nm and 532nm, was utilized. Different laser intensities and number of pulses were used on metallic and non-metallic surfaces under O2 and Ar environments to remove metal oxide and crust. Cleaning efficiency was studied by optical microscope. The results indicated the superiority of 1064 nm over the 532 nm wavelength without any detectable damage to materials’ surfaces. Marble cleaned in Oxygen gas environment was better than in Ar gas.
تأثير الآرامية على العبرية
Most communities seek, which possesses a cultural legacy to communicate with the past and to reach the best possible legislation to help them protect their cultural.
Tourism as the economic development based on the data in light distinct places, including traditional and historical environments requiring activated and revived in my adopting the concept of transnational Revival Tourism. Through the survey data in environments where conventional and (historical - Sensationalism) theoretically and practically, it was drawn from a number of indicators truth spatial phenomenon and the phenomenon depends show and try on a number of variables and interventions including historical and philosophical interpretations of those facts,
In :the _pr sent _paper we report ths. ynthesis ·of a new li:ga!!d..
[f4LJ [{'2 {1-'[(2-hyd•:0xy-.ben:zy1i.den·e)..,bxcJrazanci}:etby-l }benzerieÂ
J,5 t;rtiol .aad its complexes ·w-ith '('Mlif(1 J Fev 1 ), ed(J'l), and. :f.::I:g 01>-)
The ligand \VS preP..ated rin tWo steps' • fp I t}Je nrst stea -soJutiQil Qf
-saUcyla[deeyeq. ip methatt:oJ . re3ctcd lU1der reflux
... Show MoreJoining tissue is a growing problem in surgery with the advancement of the technology and more precise and difficult surgeries are done. Tissue welding using laser is a promising technique that might help in more advancement of the surgical practice. Objectives: To study the ability of laser in joining tissues and the optimum parameters for yielding good welding of tissues. Methods: An in-vitro study, done at the Institute of Laser, Baghdad University during the period from October 2008 to February 2009. Diode and Nd-YAG lasers were applied, using different sessions, on sheep small intestine with or without solder to obtain welding of a 2-mm length full thickness incision. Different powers and energies were used to get maximum effect. Re
... Show More