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.
هذه الرسالة هي دراسة للمتغيرات الاجتماعية الخاصة بالعائلة العراقية والمتغيرات المرتبطة بما يحصل في المجتمع واثرهما على انواع التغيرات
التصميمية الحاصلة للدور السكنية بعد انشائها. اذ يكون البحث معالجا لمشكلة عدم وضوح المعرفة الدقيقة عن نوع العلاقة بين الظواهر الاجتماعية من
جهة وظواهر التغير والتحوير الحاصلة على الدور السكنية المنشأة، عند إشغالها من قبل الأسرة وذلك في العراق عموما وبغداد على وجه الخصو
Joining 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 MoreBackground: Diabetic maculopathy means involvement of the macula by edema and exudates or ischemia which is the most common cause of visual impairment in diabetic patients,
particularly those with type 2diabetes.
Objective: The literatures are rich in publications of these regards, nevertheless the works in general were not systematic, not enough details regarding procedures and dose
parameters in using laser for treatment are mentioned. "In the present work, an attempt to build a systematic procedure regarding dose parameters, application parameters and laser
safety."
Methods: A frequency doubled Nd: YAG laser was used to treat all eyes included in this study with diabetic maculopathy. Forty eyes of tw
The present study was conducted with a view to determine whether focal laser therapy result in visual recovery and regression of macular edema in patients with non proliferative diabetic retinopathy and maculopathy ,and whether combined focal and scatter laser therapy in patients with proliferative diabetic retinopathy and maculopathy results in visual recovery ,regression of macular edema and regression of the risk factors. In the present work, a frequency doubled Nd: YAG laser was used for the treatment of diabetic retinopathy. The study evaluates 41 eyes of 33 diabetic patients both with Insulin Dependent Diabetes Mellitus IDDM, (n=16) and Non Insulin Dependent Diabetes Mellitus NIDDM, (n=17) with diabetic retinopathy divided into two
... Show MoreThe Indian costus plasma properties are investigated including electron temperature (Te), "electron density (ne)", "plasma frequency (fp)", " Debye sphere length", and amount of Debye(Nd), using the spectrum of optical emission technique. There are several energies used, with ranging from 300 to 600 mJ. The Boltzmann Plot is used to calculate the temperature; where as Stark's Line Broadening is used to calculate the electron density. The Indian costus was spectroscopically examined in the air with the laser at 10 cm away from the target and the optical fiber at 0.5 cm away. The results were obtained for an electron temperature range of (1.8-2.2) electron volts (ev) and a wavelength range of (300-600) nm. The XRF analysis reveals th
... Show MoreIn this work, the optical emission spectrum technique was used to analyze the optical emission spectrum of (CdO: Fe) plasma produced by laser Nd: YAG with a wavelength of (532) nm, a period of 10 ns, and a focal length of 10 cm in the energy range of (200-500) mJ. The electron temperature (Te) was determined using the method of line intensities ratio. Using the Saha-Boltzmann equation, the electron density (ne) was determined. Other plasma parameters such as plasma frequency (fp), Debye length (λD) and Debye number (ND) were also measured. The CdO: Fe (at a mixing ratio of X= 0.5.) plasma spectrum was observed for different energies. As a fu
... Show Moreإن التطور المستمر في مجال نظم المعلومات والإتصالات أدى الى ظهـور العديد مـن العقود الحديثة الخاصة بتجهيز خدمات الإنترنت وكيفية الإستفـادة منـها والتـي يعتبر عقد الإعلان الإلكتروني نوعاً منها , إذ يُعد الإنترنت من أبرز وسائل الإعـلان عـن المنتجـات والخدمات في الوقت الحاضر , بوصفه يقدم لناشري الإعلانات وسطاً إعلانياً إلكترونياً يفوق بكثير ما يقدمه الإعلان التقليدي , وهذا ما دفع الكثير من المعلنين ال
... Show MoreThe research aims to identify the level of increase or decrease the product cost through the activity based flexible budgeting that gives us the chance to follows the cost since the product is planed to be made till it appears in the market and it also helps to fined out any problems that are expected to happen in the future and to put the costs under control, also to know much the surveying affects the perfect use for the complete resources in order to be used in the demanded way, the research is divided in to three sides ,the first is specialized for the theoretical side, the second is for the partical side, while the third side is specialized for the conclusions and recommendations.  
... Show MoreIn this research , design and study a (beam expander) for the Nd – YAG laser with (1.06 ?m) Wavelength has been studied at 5X zoom with narrow diversion in the room temperature. by using (ZEMAX) to study the system. Evaluate its performance via (ZEMAX) outputs, as bright Spot Diagram via (RMS), Ray Fan Plot, Geometric Encircled Energy and the value of Focal shift. Then study the effect of field of view on the outputs in the room temperature.
تكفل الدساتير الملكية العامة للمواطنين جميعاً (1)، كما تصون الملكية الخاصة (2)، والملاحظ بجلاء أن الدستور في اطار حمايته للملكية العامة والخاصة يطلقهما دون مقيد، ويعممهما دون مخصص، ومؤداه أن الأصل هو ضمان الملكية بنطاقها الشخصي والموضوعي المطلق أما الاستثناء عليهما يستوجب التصريح ولا تغني الدلالة أو التأويل دون نص مخصص أو مقيد يرد في الدستور، مما يتطلب من القضاء الدستوري أن يبسط ولايته على حماية هذا النط
... Show More