In this work, the effect of vortex shedding on the solar collector performance of the parabolic trough solar collector (PTSC) was estimated experimentally. The effect of structure oscillations due to wind vortex shedding on solar collector performance degradation was estimated. The performance of PTSC is evaluated by using the useful heat gain and the thermal instantaneous efficiency. Experimental work to simulate the vortex shedding excitation was done. The useful heat gain and the thermal efficiency of the parabolic trough collector were calculated from experimental measurements with and without vortex loading. The prototype of the collector was fabricated for this purpose. The effect of vortex shedding at different operation condition

The performance of a condenser in a domestic refrigerator system without wires and a condenser with a novel design consisted of number of loops as elliptical shape is investigated experimentally in this work. The experiment was conducted with a refrigerator designed to work with HFC134a, under no load and with loads of (1.5,3 and 12 liters of water). In particular, the effects of shape change of the condenser were very important in heat transfer enhancement and reduce of the frictional loss as a result of reducing the pressure drop in the condenser. The results shown that compressor work decreases with elliptical condenser about (8.6% to 11.3%), and then the power consumption decreases also. The performance of household refrigerator with

اتضح لنا ما تقدم ان ما يسمى بالتنمية البشرية المستدامة لا تعدو تكون غير سياسة لتحشيد واستقطاب القوى المضادة للتقدم وتحويلها الى جيش موغل في منافعه بعد تشريكه بجرائم الامبريالية وتوظيفه ضد شعبه بإسم التنمية، وبإسم قلب لسلم الاولاويات، وتحريف تاريخ التقدم والتطور الذي لم يبني عرشه لا بتقديم الرعاية الانتاجية، الاقتصادية على الرعاية الاجتماعية، طيلة حقبة زمنية تجاوزت الاربعة قرون. ولما كان عصياً قلب ال

The aim of the research is to identify the economic and cultural role of contemporary interactive artworks from the public's point of view, with knowledge of the most important obstacles and proposals to improve the level of design and spread of interactive artworks. The descriptive approach was used, and the researcher used a questionnaire tool that was distributed to the audience for the events of Noor Al Riyadh (2021) and the size of the participating sample was (194) individuals from all spectrums of society. It was found through the results of the existence of public approval of the economic role of contemporary interactive artworks, as they contribute to supporting the national economy. It attracts the public to attend various paid

The purpose of the research is to present a proposed accounting system model for converting and aggregating accounting information within the framework of the differentiated accounting systems, and the research methodology consists of: The research problem is the existence of differentiated and dispersed accounting systems that operate within governmental economic units and at the same time seek to achieve a unified vision and goals for the organization, and the central research hypothesis is the possibility of conducting the process of conversion accounting information from the government accounting system to the unified accounting system, and then aggregate those systems. The research was conducted at the College of Administrat

 على الرغم من تحقق ثورة هائلة وطفرة نوعية في مجال تكنلوجيا الاتصالات في دول العالم الا ان بلدنا كان محروما من التمتع بهذه التقنيات الحديثة في ظل النظام السابق, وبعد سقوط النظام ووجود بحبوحة من الحرية، دخلت الكثير من هذه التقنيات الى العراق ومنها الموبايل والانترنيت وغيرها من وسائل الاتصال المتطورة.

ويقول (Smith & Fletcher, 2001) في كتابهما Inside Information

Financial crisis is one of the topics that have attracted the interest of researchers in recently. The research focused on the issue of the crisis of the Asian Tigers and the mortgage crisis and comparing them in terms of causes and repercussions. It may meet most of the financial crises in many of its causes, factors, roots and results in the advanced and the developing countries. This crisis has its own pattern and its causes and nature and it is characterized by a crisis of cash liquidity and the collapse of many banks and declare bankruptcy and a sharp decline in stock prices and indices of the stock market and so far the common denominators among the causes but does not mean this There are differences between the financial c

The right to property is one of the most fundamental rights enjoyed by individuals, and most national constitutions and laws, as well as international conventions, have to be respected and protected only in accordance with the economic and social development of the country (the so-called public benefit) and in return for just compensation. What is fair compensation?

يرمي الكتاب الى التعرّف على خصائص البحوث المنشورة في مجلة الأستاذ وبيان السمات والمكونات الأساسية للمجلة واعداد كشافات تراكمية متنوعة لها . وجاء الكتاب في خمسة مباحث تناول المبحث الاول الاطار العام للبحث ،وضمَّ مشكلة البحث وأهميته وأهدافه واجراءاته والدراسات السابقة ،وتناول المبحث الثاني الدراسة النظرية وضم التعريف بـكشافات الدوريات ،وبيان أهميتها والتعريف بـ كلية التربية /ابن رشد وبيان أهدافها ،ومن ثم ا

The concept of poetics has different dimensions, part of which is related to the creative achievement, and part is related to the critical perspective.