the number of students who can not complete school programs is a serious problem facing many educational systems in all educational levels . drop oui and repetition are one of the most common matters that many educators and researchers interest to study it. there are many reasons on the retention and non-completion patterns, but it can find rarely a philosophical viewpoint on the problem. the a...

In this paper, welding of dissimilar metals was demonstrated for the first time, to the best of our knowledge, by using a high-energy high-repetition-rate femtosecond fiber laser. Metallurgical and mechanical properties were investigated and analyzed under various processing parameters (pulse energy, repetition rate, and welding speed). Results showed that the formation of intermetallic brittle...

The study of biochemical dynamics by ultrafast spectroscopic methods is often restricted by the limited amount of liquid sample available, while the high repetition rate of light sources can induce photodamage. In order to overcome these limitations, we designed a high flux, sub-ml, capillary flow-cell. While the 0.1 mm thin window of the 0.5 mm cross-section capillary ensures an optimal tempor...

A method of performing diffusion-weighted imaging (DWI) and diffusion tensor imaging (DTI) of the fetal brain in utero is proposed. The major difficulty of performing diffusion imaging in utero is the presence of motion. By modifying conventional single-shot spin-echo echo-planar DWI with a short repetition time sequence, a sequence that performs DWI and DTI within a breath-hold of the mother (...

Matrix functions are used in many areas of linear algebra and arise in numerical applications in science and engineering. In this paper, we introduce an effective approach for determining matrix function f(A)=g(q(A)) of a square matrix A, where q is a polynomial function from a degree of m and also function g can be a transcendental function. Computing a matrix function f(A) will be time- consu...

Abstract This study investigates ‘repetition’ in the English translation of the Arabic Novel, Adrift on the Nile (1993). It aims to explore the communicative functions of ‘repetition’ and to see if these functions have been maintained or lost in the process of translating the Novel. In addition, it seeks to find the translation strategies used in rendering ‘repetition’. To achieve this aim, a d...

Majority of high volume laser manufacturing processes require high throughput, improved accuracy, and minimal thermal damage to the target material. Diode pumped solid state (DPSS) Qswitched nanosecond pulsed lasers are routinely being used today in the manufacture of semiconductor, microelectronics and solar cells. They offer low noise, high stability, and reliability required for a robust man...