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 Ayyub era witnessed a popular for science, knowledge and became the Ayyub state in its various regions a scientific beacon، despite their preoccupation with wars with the Crusaders now that did not discourage them from their care for science and scientists، and this scientific renaissance had many factors، foremost of which are the tendencies of the sultans and Ayyub kings to pay attention to science and its care، through their establishment of the role of science
يقوم الخطأ المضمر على فكرة مبناها استنتاج الخطأ من وقوع الضرر، منشئاً بذلك قرينة قانونية بسيطة للمدعي (المضرور) تعفيه من اثبات خطأ المدعى عليه (المسؤول)، وهذا الافتراض في الاساس فكرة قضائية وجدت لمساعدة المضرور في الحصول على التعويض في حالة عدم تمكنه من تحديد خطأ المسؤول ، الا انه افتراضٌ قابلٌ لإثبات العكس من خلال نفي اي خطأ صادر عن المدعى عليه ، ويمكن نفيه ايضاً بإثبات انقطاع السببية بين الخطأ المضمر والضرر
... Show MoreThe Abbasid state inherited many enemies because of the Islamic conquests in the Umayyad era and its geographical extension, which included a number of seas, so it had to direct its energy to preserve the achievements achieved by its predecessors from the Muslims. One of the sea princes who had a role in protecting the coasts of the Abbasid state, especially in the Levant and Egypt.
The Subject of contritutions to Jerusalemites Scientific in Egypt from 8.5 Century 14.11 AD of noteworthy studies Concern Coming Of these Scientists to Egypt has helped toth to Seek Knowledge and Study or teaching in the tooming w0rid of Science broadly and distinctive through Scientific interaction and intermingling of Civilization between Scientists this Mixing effect of the Scientific life and in tellectal of The nam
... Show MoreIt takes a long time and a lot of money to choose and provide clothes. It is soothing
necessary to care of them in order to use it another time. There is no Disposable clothes
until now, like other things in the house which we used for once then we dropped, then we
can use new one without any time or effort can be mentioned like needles, nappy, tissues
and etc.
The clothes are different; people should take care of and clean them again in order to
use them again. The right care of clothes would make them last for a long time. So, there is
no need to buy a new one instead of them in a short time. This thing provides time and
effort for the people and the family, to affect positively on the family’s budget.
We s
Address the current research study " Symbol Significances in Fakhir Mohammad Paintings " in an attempt to detect signs of the icon in the artist's fee . The research contains four chapters The first chapter of which the methodological framework for the search starting with the problem of the specific research and asking the following: Maaltold semantic code in fees Luxury Muhammad? As well as displaying the importance of research and the need for it and in order to search through ( you know the implications of the code in the fee Luxury Muhammad) and for the period of ( 1980-2010 ) in his works of art as well as identifying the search terms . In the second chapter , such as the theoretical framework , and contained three sections focus o
... Show Moreتعرض الاقتصاد العراقي إلى صدمات نقدية شديدة بسبب الظروف السياسية والاقتصادية غير المستقرة والمتمثلة بشكل أساسي لخوض العراق حرب طويلة الأمد مع إيران في الثمانينات وحربين مدمرتين مع الولايات المتحدة الأمريكية فضلاً عن فرض الحصار الاقتصادي طيلة ثلاثة عشر عاما ً .
وتهدف هذه الدراسة إلى قياس وتحليل الصدمات النقدية التي تعرض لها الاقتصاد العراقي في فترة الثمانينات والتسعينات وبداية هذا القر
... Show MoreThe current study aims to examine the level of problems faced by university students in distance learning, in addition to identify the differences in these problems in terms of the availability of internet services, gender, college, GPA, interactions, academic cohort, and family economic status. The study sample consisted of (3172) students (57.3% females). The researchers developed a questionnaire with (32) items to measure distance learning problems in four areas: Psychological (9 items), academic (10 items), technological (7 items), and study environment (6 items). The responses are scored on a (5) point Likert Scale ranging from 1 (strongly disagree) to 5 (strongly agree). Means, standard deviations, and Multivariate Analysis of Vari
... Show Moreالآخر في الشعر العربي الحديث (من نكسة حزيران إلى أخريات الألفية الثانية)