In this paper the effect of engagement length, number of teeth, amount of applied load, wave propagation time, number of cycles, and initial crack length on the principal stress distribution, velocity of crack propagation, and cyclic crack growth rate in a spline coupling subjected to cyclic torsional impact have been investigated analytically and experimentally. It was found that the stresses induced due to cyclic impact loading are higher than the stresses induced due to impact loading with high percentage depends on the number of cycles and total loading time. Also increasing the engagement length and the number of teeth reduces the principal stresses (40%) and
(25%) respectively for increasing the engagement length from (0.15 to 0

The evacuated tube solar collector ETC is studied intensively and extensively by experimental and
theoretical works, in order to investigate its performance and enhancement of heat transfer, for Baghdad climate
from April 2011 till the end of March 2012. Experimental work is carried out on a well instrumented collector
consists of 16 evacuated tubes of aspect ratio 38.6 and thermally insulated tank of volume 112L. The relation
between convective heat transfer and natural circulation inside the tube is estimated, collector efficiency, effect of
tube tilt angles, incidence angle modifier, The solar heating system is investigated under different loads pattern (i.e
closed and open flow) to evaluate the heat loss coefficient

The Ottomans ruled Turkey for nearly six centuries, during which the Ottoman Empire passed through varying periods in terms of strength, influence, and the area of ​​land they ruled.  In the last decade of its rule, the Ottoman Empire was severely weakened in all political, military, administrative and economic aspects. In addition to the internal strife that was stirred up by the leaders of the Association (Union and Progression), that organization that led the coup movement against the Ottoman Empire later.

After the abolition of the Sultanate and the proclamation of the Turkish Republic, the social fabric in Turkey changed, and many customs and traditions alien to it emerged to society. One of the thing

The personality of an individual comes from the social adjustment which is
represented by the individual interaction with the others. If the individual has acceptable
adjustment, he/she has good social skills such as the flexibility in interaction with others and
accepting the living with them.
Sometimes, the individual show pretended personality in his/her interaction with
others and we should accept the appearance of this characteristic in society. An individual
lives in this society among different types of human personalities with his own personality
which represents emotional, social, rational and physical characteristics.
These characteristics have their importance to be studied within college students
be

The recent research aims to. Know the Engagement with students of university. Know significant statistical differences in degrees depending Engagement with the following changes .The Gender  (Males and females). The Specialization(scientific and humanitarian).  The scholastic grade (first, second ,third, fourth grades) For achieving the aims of research , we must use the Descriptive method and Identify community search and selection its samples:  The students of university of Baghdad for the academic year 2014-2015 represented by the scientific and humanitarian colleges of morning study for the grades (first, second, third and fourth) The number of colleges (25) of humanitarian and scientific disciplines of (12) Co

Current search targeted to:
  1 - Measuring the psychological rebellion among the students of the university.
  2 - Identify the significant differences in the degrees of psychological rebellion among members of the sample according to the variables of sex (male - female), specialty (Science - a human).
      To achieve the objectives of the research chose researcher samples from the community of the first search for statistical analysis, has reached 400 students, and the second sample of the application of the final, has reached (480) students were selected randomly with simple check of equal value, and the researcher building a search tool double think, After the comple

استهدفت الدراسة تعرف درجة الهوية الوطنية لدى طلبة الجامعة، ومعرفة دلالة الفروق الإحصائية في الهوية الوطنية لدى طلبة الجامعة وفقاً لمتغير الجنس (ذكور، اناث) وكذلك تعرف دلالة الفروق الاحصائية في الهوية الوطنية لدى طلبة الجامعة وفقاً لمتغير التخصص (علمي،إنساني) وتحدد مجتمع البحث للدراسة الحالية بطلبة الدراسات الأولية الصباحية في جامعة بغداد، كلية الآداب وكلية العلوم للعام الدراسي (2024/2025) وبلغ حجم المجتمع (61481)

This research aims to identify the relationship between occupational hypocrisy and organizational strategic success, It was done by analyzing the correlations and influence between variables,  applied to a random sample of university professors at the University of Kufa faculty of administration and economic.

 The main tool for data collection is the survey were questionnaires were distributed randomly to the professors , and (43) questionnaires were returned, and test its validity by using (SEM) (Structural Equation Modeling), Hypothesis has been tested by using Statistical Package for Social Sciences (SPSS v. 18), The research found a set of conclusions:(The occupational hypocrisy has

Objective of the research This study aimed to manufacture an innovative device that enables the player to walk after the operation and improves functional efficiency through improvement in the range of motion as well as improvement in the size of the muscles working on the knee joint Imposing research There are statistically significant differences between the pre and posttests of the experimental and control groups, there are Statistically significant differences between the post-tests between the experimental group and the control group in favor of the experimental group of the research sample. The researchers used the experimental approach by designing the control and experimental groups with a test (pre-post) for the suitabili