One of the most important phenomenon that occurs in sheet metal forming processes is the spring-back, which causes several geometrical alterations in the parts. The accurate prediction of springback after bending unloading is the key to the tool design, operation control, and precision estimate concerning the part geometry. This study investigated experimentally the effect of pretension in three rolling direction (0, 90, 45 degree) on the springback behavior of the yellow brass, sheet under V shape bending die. The pre-tension ranges from five different levels starting of 11% to 55% from the total strain in each rolling direction by regular increase of 11 %, then bent on a V-die 90 degree for the springback estimate. From experiment the

The trade war, of course, leads to a sharp tension in international relations because the economy is the lifeblood of the states. In the world of trade and economy, countries began to lean towards cooperation. Economic relations after World War II were more liberal, trade barriers were removed and global trade became more flexible and smooth

    In the subject area (participation and tandem), the study showed the views of Mr. Sadr in this field when researching first: the issue of the necessity of these two phenomena in the language that some imams of the language and principles called for to discuss and respond to, and

أرمينيا أكبر وأعلى إقليم جبلي في آسيا الغربية ، تقع عند الحدود الفاصلة بين آسيا وأوربا ، انعمت عليها الطبيعية بتضاريس كانت تارة خيراً وبركة على الأرمن وتارة اخرى شراً ووبالاً عليهم ، والى جانب كونها منطقة عبور هامة بين الشرق والغرب فان الارباح الطائلة التي جنتها من نشاطها الاقتصادي دفع الدول الكبرى آنذاك إلى السيطرة عليها وسلبها حريتها . وتتابع على ضمها الى نفوذه منذ ظهورها في القرن السابع قبل الميلاد كل من ا

       The current research aims to build a training program for chemistry teachers based on the knowledge economy and its impact on the productive thinking of their students. To achieve the objectives of the research, the following hypothesis was formulated:

   There is no statistically significant difference at (0.05) level of significance between the average grades of the students participating in the training program according to the knowledge economy and the average grades of the students who did not participate in the training program in the test of productive thinking. The study sample consisted of (288) second intermediate grade students divided into (152) for the control group

The global challenges of contemporary facing societies urge to seek and move to adopt the style conscious in the face of these challenges and work on the investment of human resources and energies humanitarian efficient and effective for the development of the institutional and Management and make it more efficient and effective and meets the requirements and keep pace with global developments , and more aspects of managerial aim is Total Quality Management , as it has become thanks to the sheer amount and large accelerated technical developments and information and communication technologies , which feature of this era , and in the field of education , the charge of it are seeking through the application of total quality management to b

Nitrogen dioxide NO₂ is one of the most dangerous contaminant in the air, its toxic gas that cause disturbing respiratory effects, most of it emitted from industrial sources especially from the stack of power plants and oil refineries. In this study Gaussian equations modelled by Matlab program to state the effect of pollutant NO₂ gas on area around Durra refinery, this program also evaluate some elements such as wind and stability and its effect on stacks height. Data used in this study is the amount of fuel oil and fuel gas burn inside refinery at a year 2017. Hourly April month data chosen as a case study because it’s unsteady month. After evaluate emission rate of the all fuel and calculate exit velocity from

خضعت العلاقة بين موقف الحساب الجاري, سواء اكان بحالة عجز ام فائض, وسعر الصرف, اكان بحالة انخفاض او ارتفاع, لجدل واسع بين اوساط الاقتصاديين بشأن هذه العلاقة واتجاهاتها.

الا ان الاعتماد المتزايد لبعض الدول على المستثمرين الاجانب لتمويل العجز في حساباتها الجارية قد يصطدم بعدم رغبة هولاء المستثمرون في الاستمرار باقتناء موجودات معينة مقوِِِِِِِِمة بعملات تلك الدول. وتنشأ الطامة الكبرى لاقتصاد

Biological activity of the carotenoids which are produced fromchemically-mutaed local isolate of Rhodotorula mucilaginosawas studied. The results showed variation of inhibition activity of caritenoids against different types of pathogenic bacteria include, Staph aureus, E. coli, B. subtilis and Salmo. typh., the number declined from 2×107cell/ml to 2×104, 5×104, 2×105, 9×105 cell/ml respectively after 24hour. The produced carotenoids from alocal mutant Rhodotorula mucilaginosa revealed an antioxidant activity as free radical removal of 85.6%. Carotinoides revealed a highest stability in petroleum ether solvent for 30 days at room temperature. It found that the pigment was more stability in sesame oil compared with sun flower and coc