Al-Rafidain University College For Sciences

Solar energy is one of the main power sources of electricity in the world. It has become widespread as an attractive solution to provide low power consumption to human groups live in remote villages or areas away from the national electric grid, also when the electric power is underproduction such as in our country (Iraq). For this reasons we designed a system of photovoltaic generator with facilities to be built in houses.
The system consists of three basic parts of equipment, 3KW peak solar panels, which could be spread easily at the housetop, a storage battery system and the electrical control system.
The electrical control system was completely designed and tested using ORCAD simulator, it consists of 4KW battery charge regulator with 300V system, and 220V, 50Hz transformerless three – level square wave inverter.

This research deals with unusual approach for analyzing the Simple Linear Regression via Linear Programming by Two - phase method, which is known in Operations Research: “O.R.”. The estimation here is found by solving optimization problem when adding artificial variables: Ri. Another method to analyze the Simple Linear Regression is introduced in this research, where the conditional Median of (y) was taken under consideration by minimizing the Sum of Absolute Residuals instead of finding the conditional Mean of (y) which depends on minimizing the Sum of Squared Residuals, that is called: “Median Regression”. Also, an Iterative Reweighted Least Squared based on the Absolute Residuals as weights is performed here as another method to estimate the regression coefficients.

Design cryptographic system requires some properties like security, speed and other. One of the most important design criteria is the key management system it is considered as another part of the cryptographic system. Good cryptographic systems must have a strong key management systems responsible for generate the key, store and exchange it. Since the security of the system depends on the secrecy of the key not on the algorithm. It becomes important to study and design this part of cryptographic system. In this paper a new key management system was proposed. This system is capable of generating pair of private / public key, store, exchange and revoke it. The proposed system works between two parties and does not need the third parity.It can countermeasure man in the middle attack, replay attack and clogging attack. The proposed system is based on the PEM (Privacy Enhanced Email) since it’s a simple electronic mail security service program but its key management process suffers from some difficulties which will be discussed in this paper. The proposed system can work with any security system requires key exchange process.

The research aims to measure the efficiency of the production sectors of the economy of Iraq prior to 2003 and after, so that it identifies any of the models maximize the total production ,and profitability of the Iraqi economic sectors subjected to investment, in order to know the possibility of using the abilities ,and develop them to achieve economic growth target.
Game theory was used to achieve the objective of the research, based on the data representing the added value of output Iraqi economic sectors at fixed prices for the years 2002 and 2008 ,to represent the data before and after American invasion in 2003 , and The Fixed Capital Formation in fixed prices for the same period.

Starting from the principle of computer security that branched to many fields, whereas the encryption is one from, therefore this paper focused on a new idea of data encryption, it depends on modular and integer division operations, and then will produce two numbers, first one represents the result of (MOD operation), second one represents the result of (DIV operation), and then these two numbers and the secret key will be used within the two functions to produce an encrypted file. The proposed method will use one symmetric key to encrypt the plaintext, also there is another proposed elementary level of encryption depends on substitution technique, Finally this paper includes explanation of how the data will be encrypted and decrypted using the idea of (MODULAR and DIVISION), also include some results, computations, the proposed algorithm. This technique will be named as (MODIV) method

The Heat Gain through concrete roof which is used in Iraqi building is reduced by increasing the value of thermal resistance of that roof this is done by addition of several materials to the external surface (roofing brick 30 mm thick, plastic tile 1.5 mm thick, light glass fiber, 1.5 mm thick with air gap 75 mm, Aluminum metal sheet ordinary & reflective with air gap or insulation 25 mm). The researcher was build (4.5 x 4.5 x 3) m sample room in 3rd floor in building at Baghdad city (33.2°N) with 200 mm thermal insulation for other room surfaces and A.U Air – conditioner of 1.0 ton refrigeration capacity is used to maintain the standard thermal comfort, the roof surfaces temperature were measured from 5:00 a.m to 11:00Pm (19 hr/ Day) during May to September. Finally, it was found that the Aluminum reflective metal sheet with insulation saved about 42V. from electrical energy which consumed in ordinary ceiling for cooling purpose, and followed that , used plastic tile with saved 39%, and flooring brick at 31% , and the difference saving between reflective and ordinary metal sheet is (14 – 15) % and also between used insulation or air gap is (19 – 20) %

This paper covers our computational work and the algorithms designed for the determination of the tensor product of representations for the dihedral group Dn, which give us the general tensor product of representations for Dn, .

The case study of the job satisfaction for individuals and to identify the factors affecting it and the reasons that may prevent achieved is necessary to be concerned by each Organization seeking to improve their performance, develop their activities, and achieve competitive advantage in the work environment.
Research aims at determining the factors affecting the job satisfaction for an important category of employees in the organization (Higher degrees workers) and try to rank in the hierarchy of priority according to the degree of their importance and their impact on the level of satisfaction achieved.
Questionnaire was distributed to (80) employees holding higher degrees in the Ministry of Science and Technology. The method of (Factor analysis) was adopted in the processing of data obtained from the Questionnaire after sorting and tabulating them, which aims at getting the most simple images that show the relationship between the variables through common factors between them, and then arranged in the degree of influence.
The study has concluded to an umber of conclusions and recommendations. The most important conclusions that the satisfaction achieved in the outcome of the interaction of arrange of factors considered but not the result of the impact of each of them separately.
The factors has also ranked in priority according to their importance and influence on the theoretical, Moreland scientific features for the researched group .then the moral factors have the superiority on the physical factors in the level of job satisfaction achieved .

To evaluate the efficiency of oxidized regenerated cellulose (ORC) in preventing post-extraction dry socket.
Materials and Method: We present a single blind, randomised study on 30 patients to evaluate the efficacy of the ORC, placed only once within the alveolus, on the reduction of the incidence of impacted third molar post-extraction dry socket alveolitis and its post-operative effects on patients.
Results. A reduction of 42.65% in the occurrence of alveolitis and a more favourable post-operative period in the experimental group was observed. In the control group, the appearance of alveolitis was 30.76% opposite to 5.88 % in the experimental group.
Conclusions: The oxidized regenerated cellulose (ORC), applied only once after the extraction of impacted third molars, seems to be an appropriate option for the reduction of alveolitis. It improves the buccal aperture and oedema in the post-operative period, although further double blind studies with larger samples are necessary.

Main complain of dental problems is a good indication for the most prevailed oral problems. In this paper an attempt has been made to identify the prevailed dental problem and to cast light on the parameters that well associated with it. Gingivitis was found the most common complain in this sample and it was found to be significantly associated with education level. Bad education can be considered as the most reason lead to such a problem. Rural style of living is also found to be significantly affected the incidence of oral diseases in this sample.

This research is concerned with studding the coloration of innovation concepts that are represented by (intellectual exercise , introducing exclusive the new , a diction that cause unusual response , a directive human activity , distinct ability , “heavenly” inspiration) on performance concepts that represented by (organization activities , achieving cretin goals , style of management , studying the environment and choosing the best strategy)
So the research enable us to introduce innovation which can tell us about any relationship between it and the performance and who can we use the benefit that come out of it to develop our colleges.

It is well-known that the most wide spread diseases among infants is the janndice which occurs widly with predelivered fetus because of the disability of the liver to produce enzymes which called “Glycony Itranfecs” which needs to get rid of billion from excretion so when the rate of the billion in blood increases more than 250-350 milimole that will destroy the brain (Ternicataus) so the process of recharging the blood is necessary.
The discriminative analyses have been used to study the available data through the number of patients and its rate in blood. One of the reasons of this disease is that the mother being exposed during her pregnancy to diseases and this case is called “Torch” or the difference of the parents in blood group. To treat it ,on should change the blood babies if is diseased through 24 hours ,while if it happened through 48 hours ,so it depends on the rate either increasing the suckling if its rate was low or photo ray if its rate was high.

This research aims at spreading spirit of scientific research in one of the important educational in Iraq throughout specifying it\'s factors, it\'s construction it\'s application and it\'s development.
The factors are:-
1. Scientific fields and training.
2. Fields of systems and modern technical fields.
3. Fields of materialistic and moral motives.
4. Administrative and procedural fields.
These factors were taken in consideration by teaching staff members concern with their different scientific titles and their emphasis on it\'s role in raising the efficiency of the administrative scientific research activity in the institutes of the foundation.

The Electrical industry regards one of the most basic elements which leads to the social and economic development and an important power factor to any community from the communities.
The sector of Electrical industries witnessed a great development in any fields such as increasing the current production in many fields ,improve the variant kinds of the production , to overcome the difficulties which faces the developing of the plant.
The Main Problem of the research is in trying to study and analyze the factor Improvement to the production plans.
Research objectives are to discussion and describe some Function & factures the Effect on plans production.
The Research importance, generally the factor Improvement to the production plans from general company The Electrical industry.
The Research depended in collecting data, on a special questionnaire (1, 2 ) it has designed from researcher in measurement the research variables of the study variations, it was distributed to an intended sample of (50).
Represents on the general manager, the deputy of the general manager, main divisions managers, fan factory manager, the experts and the principals of Production Lines for these plant.
For the sake of the data treatment, several statistical methods were used; such as (Percentage, Weighted Arithmetic Mean, Relativity Importance ( .
Research found to some of conclusions to adopt the applying of development to the production plans for the company.
Finally on the research offers some recommendations.