In this article it is proved experimentally that the photon is a particle that has mass and constant wavelength by explaining the effect of refractive index on the wavelength and the natural mass of photon. It is very difficult to measure the mass of photon, a simple and easy process was proposed in this paper to calculate the mass length of photon in vacuum (Y) and in medium (Y*), by measuring the length of laser beam in air (L_air) and in medium (L_med). A new method was postulated to calculate refractive index by using these relations (n = Y*/Y), and (n = L_med / L_air) which supposed a new theory of light.

Background: Sperm motility disorder is an important cause of infertility in male, and one of the causes of reduced motility of the sperm is the disorders of the mitochondria because it provides the required energy for sperm motility, Laser biostimulation or low-level laser therapy has a positive effect on the mitochondria and led to increasing the synthesis of ATP. Method: Twenty fresh human semen samples were used in this research study, each sample was separated into two portions, one was used as control which is not exposed to the laser beam and the other was irradiated with the wavelength of 410 nm diode laser with an output power of 100 mW and an exposure time of 60 seconds, then the measurement of

Abstract

 Experimental work from Magnetic Abrasive Finishing (MAF) tests was carried out design parameters (amplitude, and number of cycle which are formed the shape of electromagnetic pole), and technological parameters (current, cutting speed, working gap, and finishing time) all have an influence on the mechanical properties of the surface layer in MAF process. This research has made to study the effect of design and technological parameters on the surface roughness (Ra), micro hardness (Hv) and material removal (MR) in working zone. A set of experimental tests has been planned using response surface methodology according to Taguchi matrix (3⁶) with three levels and six factors

The research intended to take into consideration the phenomena of employing the temporary employees through the business organization increasingly, which has become one of the most apparent features of the contemporary strategy of the human resources management. It depends on the analytical descrptive Approach to meet the research problem which has been focalized around the dispute praising regarding the phenomena of the temporary employment and its dimensions and challenges which can be faced by the management of human resources as a result .The importance of the research is represented as one of rare research which confronts to the phenomena of the temporary employment in the Iraqi business environment. The most prominent objec

Women are a social entity and can not be ignored starting from the process of creation Almighty and through the fact that it represents half of society and a fundamental factor and the corner can not be dispensed with in the composition of the family it is no longer acceptable to leave women to perform their role social and cultural or competitive and political role and in all aspects of political activity, It was not only women but the entire society lived loss, anxiety and oppression, a natural state created by deviation from the teachings and values of civil and followers of the corrupt positions in perception and conscience and behavior and links and relations and transactions until corruption became prevalent in all Social, economic

The research aims to clarify the role of the main variable represented by the four dimensions of entrepreneurial behavior (creative, risk-taking, seizing opportunities, proactivity), in Reducing the dependent variable of organizational anomie with the dimensions (Organizational Normlessness, Organizational Cynicism, Organizational Valuelessness).

The experimental, analytical method was adopted in the completion of the research, and an intentional sample of (162) individuals in the administrative levels (higher and middle) in the factory was taken. The questionnaire was also adopted as the main tool, which

احتلت قضية غسيل الاموال أهمية كبيرة على الساحة الاقتصادية العالمية خلال الفترة الاخيرة إدراكا من المجتمع الدولي لأثارها السلبية على الاستقرار الاقتصادي و خاصة على الاستثمار المحلي و الدولي و لذلك يتزايد الاهتمام بها و سبل مواجهتها من قبل العديد من الدول و المنظمات الدولية و المراكز المالية الكبرى , حيث تهدد هذه الظاهرة الاقتصاد العالمي و خاصة اقتصاديات العالم النامي و من بينها الاقتصاديات العربية .

ان

أن التطور الاقتصادي  في أية دولة إنما يقاس بالدور الذي يلعبه القطاع الصناعي في اقتصادياتها، ومقدار ما يسهم به في الناتج المحلي الأجمالي. ولا يخفى أن ينسب ذلك إلى خصوصيات هذا القطاع بوصفه الميدان الذي تتحقق فيه انجازات الثورة العلمية والتكنولوجية أكثر من غيره من الميادين، وأرتباطاته الأمامية والخلفية مع سائر القطاعات. يضاف إلى ذلك أن القطاعات الأخرى تتأثر ايجاباً بنمو القطاع الصناعي، كما انه المسؤول

Somal is considered one of the unstable and restless African Arabian country in
comparison with other Arabian. It has been exposed to division and separation by
European colonization process that worked hardly on dividing this country according to
Berlin conference (1884-1885). Even after obtaining its independence during the sixties
and being led by civilian organizations which were unable to solve the problems of
Somalian society after obtaining the independence.
Somal continued its suffering even after the military rule under the leadership of
Mohammed Sayad Beree.
During Beree's rule, Somal suffered from the War with Ethiopia, as well as it
witnessed an economical Crisis. It suffered also from the tribal po

يهدف هذا البحث الى عرض رؤيا تشخصيه لمجتمع المعرفة في ظل اقتصاد المعرفة من خلال استعراض العديد من المفاهيم النظرية والعلاقة بينهم كمفهوم البيانات والمعلومات والمعرفة ومجتمع المعلومات والمعرفة, ومصادر المعرفة, والمراحل التطورية للتحول الى مجتمع المعرفة, ومن ثم استعراض الأبعاد الأساسية لمجتمع المعرفة, إضافة إلى الملامح الأساسية لاقتصاد المعرفة وخصائص ذلك الاقتصاد, ثم تناول البحث المورد المعرفي وعلاقته