An experimental investigation of the variation of argon discharge current with a glow and afterglow time intervals of a square discharge voltage was carried out at low pressure (6-11 mbar). The discharge was created between two circular metal electrodes of diameter (7.5 cm), separated horizontally by a distance (10 cm) at the two ends of a Pyrex cylindrical tube. A composite of two Gaussian functions has been suggested to fit and explain the variation graphs clearly. It is shown that the necessary times of glow and afterglow needed to attain a maximum discharge current are (70 us) and (60 us), respectively. The discharge current is observed to drop to the lowest value when the two times are serially longer than (85 us) and (72 us). Furthermore, the difference between the two times required to obtain a maximum rate of change in the discharge current, or a maximum discharge current, is deduced to be comparable to the breakdown time delay of gases reported in the literature. These observations can be useful for the design of plasma devices requiring specialized engineering.
The research aimed at measuring the degree to which the accept their class environment in governmental & civil Kindergartens & it also aimed at knowing the differences between the dimensions of the measurement & the differences according to the kindergarten & class variables .
The researcher made a measurement for the class environment & it included five dimensions & the answering choices were three ( to a big extent , to some extent and no ) and after making sure that the measurement is usable , the researcher applied it on the sample which consisted of ( 212 )male & female children through the estimated answers of the teacher & the result was that there was an accep
... Show MoreThe research titles “Ammorrite tribes and their historical role in Mesopotamia and Levant” deals with tribe structure, nomination, political and cultural roles of these tribes in Mesopotamia and Levant, as it terminate Sumerian presence in Iraq and changed historical course and contributed in changing population landmarks and started new bright era, in addition to admitting new beliefs, gods and laws, beside ruling principles which became tribal, i.e., dynasties instead of Sumerian rulings based on religion belief.
يهدف البحث إلى تحليل خطوات التكلفة المس تهدفة الخضراء من أجل تخفيض تكاليف الفشل البيئية المتمثلة بالتكاليف الداخلية والخارجية للشركات الصناعية وجعل منتجاتها صديقة للبيئة وذات ضرر قليل من خلال تخضير المنتجات والتي تؤدي إلى تخفيض تكاليف الفشل البيئية
as important aspects emerged related to the management of the caliphate and how it was transferred, and the clarification of the political trends and transformations at the end of their lives. In addition, how the Rightly Guided
Abstract The Kenyan policy towards Somalia was influenced by a set of interrelated factors between the two countries and stemmed from the internal environment and most prominent: the geographical factor, ethnic, cultural, religious, political, economic and security, has been dominated by this policy since independence from the British colonial administration in the sixties of the last century and so far the nature of instability and tension, As the two countries are geographically contiguous and as security risks escalate, Kenya in 2011 rushed military action against Somalia, the first military action by Kenya outside its borders since independence.
يعد الأمن البيئي موضوعاً حيوياً لا سيما في العصر الحديث، حيث بدأت تحديات التغير المناخي تتدهور وبسرعة متزايدة. وتزداد أهمية هذا الموضوع مع تصاعد تلك التحديات، أذ يتعين على الجميع لا سيما النساء منهم المشاركة في الحفاظ على البيئة لضمان استدامتها للأجيال الحالية والمستقبلية. ويُعد الحفاظ على البيئة والموارد الطبيعية أمراً ضرورياً لضمان استدامة الكوكب ومستقبل الأجيال القادمة. وفي هذا السياق، يأتي دور المرأة
... Show Moreتم ت داول مصطلح الأزمة ا دلولية في السياسية ا دلولية خال القرن التاسع عش ر لتحدي دا ملدة الانتقالية بين السلم والحرب سواء أ دت الأزمة إلى نشوب صراع مسلح أم مت ت ت سويتها بالطرق السلمية، وتع دالأزمة ا دلولية مرحلة مت هيدية ل لحرب وهي ا رملحلة التي يسعى فيها أ طرا فالأزمة إلى إبعاد احتمالية نشوء أ و اندلاع الحرب، فالأزمة ه ي مدة حرجة ومرحلة خطيرة بين وقتي السلم والحرب، إن العلاقات ا دلولية تكاد ت عيشأ زمات متلاحقة ع
... Show MoreThe current research aims to identify the occupational stresses of doctors who are working in governmental hospitals according to the variables of gender and career ranking. The researcher adopted a scale to measure the occupational stress of (1088) doctors (561 males and 527 females) working in governmental hospitals. The results have shown that doctors have a high level of professional stress, but there is no significant difference between doctors in terms of gender. However, there were significant differences in favor of novice residents.