An insight into internet sector in Iraq

The internet is considered to be the most advanced technology today and a gateway to modern communication and the sharing of information, products, services, and technology. Nowadays, users want to be able to access anywhere and anytime several services and applications, which is increasing data traffic and triggering a mobile data explosion. Iraq has major problems in increasing the growth and use of the internet and changing the standard method of communication. This is a big challenge, however, since there are several variables that characterize this phase of transformation. In this paper, the problems, vision, and solutions are presented in details. This study aims to clarify the factors of internet use in Iraq by the use of an acceptable approach and by suggesting new solutions for all the presented problems. This work also, clarify the expected traffic and the mechanism to transform the traffic between local ISP’s networks (AS) internet exchange points

Limit load instabilities in structural elements

Este trabajo analiza distintas inestabilidades en estructuras formadas por distintos materiales. En particular, se capturan y se modelan las inestabilidades usando el método de Riks. Inicialmente, se analiza la bifurcación en depósitos cilíndricos formados por material anisótropo sometidos a carga axial y presión interna. El análisis de bifurcación y post-bifurcación asociados con cilindros de pared gruesa se formula para un material incompresible reforzado con dos fibras que son mecánicamente equivalentes y están dispuestas simétricamente. Consideramos dos casos en la naturaleza de la anisotropía: (i) Fibras refuerzo que tienen una influencia particular sobre la respuesta a cortante del material y (ii) Fibras refuerzo que influyen sólo si la fibra cambia de longitud con la deformación. Se analiza la propagación de las inestabilidades. En concreto, se diferencia en el abultamiento (bulging) entre la propagación axial y la propagación radial de la inestabilidad. Distintos modelos sufren una u otra propagación. Por último, distintas inestabilidades asociadas al mecanismo de ablandamiento del material (material softening) en contraposición al de endurecimiento (hardening) en una estructura (viga) de a: hormigón y b: hormigón reforzado son modeladas utilizando una metodología paralela a la desarrollada en el análisis de inestabilidades en tubos sometidos a presión interna. This present work deals with the instability of structures made of various materials. It captures and models different types of instabilities using numerical analysis. Firstly, we consider bifurcation for anisotropic cylindrical shells subject to axial loading and internal pressure. Analysis of bifurcation and post bifurcation of inflated hyperelastic thick-walled cylinder is formulated using a numerical procedure based on the modified Riks method for an incompressible material with two preferred directions which are mechanically equivalent and are symmetrically disposed. Secondly, bulging/necking motion in doubly fiber-reinforced incompressible nonlinearly elastic cylindrical shells is captured and we consider two cases for the nature of the anisotropy: (i) reinforcing models that have a particular influence on the shear response of the material and (ii) reinforcing models that depend only on the stretch in the fiber direction. The different instability motions are considered. Axial propagation of the bulging instability mode in thin-walled cylinders under inflation is analyzed. We present the analytical solution for this particular motion as well as for radial expansion during bulging evolution. For illustration, cylinders that are made of either isotropic incompressible non-linearly elastic materials or doubly fiber reinforced incompressible non-linearly elastic materials are considered. Finally, strain-softening constitutive models are considered to analyze two concrete structures: a reinforced concrete beam and an unreinforced notch beam. The bifurcation point is captured using the Riks method used previously to analyze bifurcation of a pressurized cylinder

Frequency Dispersion Compensation Method for TR Imaging using CWT

Content type: Research data Research data type: Simulation data Abstract: The attached files are the simulation data of the figures of the journal paper titled: "Continuous Wavelet Transform Based Frequency Dispersion Compensation Method for Electromagnetic Time-Reversal Imaging". 1) fig3-a-b.txt: The 1st and 2nd columns are used to generate Fig.3 (a) and Fig.3 (b) respectively. The data of each column are for 150X150 2D plot. 2) fig3-c-d.txt: The 1st and 2nd columns are used to generate Fig.3 (c) and Fig.3 (d) respectively. The data of each column are for 150X150 2D plot. 3) fig4-a.txt: The 1st & 2nd columns represent the x and y axis respectively. The third column is used to generate Fig.4 (a) which is a 150X150 2D plot. 4) fig4-b.txt: The 1st & 2nd columns represent the x and y axis respectively. The third column is used to generate Fig.4 (b) which is a 150X150 2D plot. 5) fig4-c.txt: The 1st & 2nd columns represent the x and y axis respectively. The third column is used to generate Fig.4 (c) which is a 150X150 2D plot. 6) fig5-a-cwt.txt: Is used to generate the CWT curve in Fig.5 (a). 7) fig5-b-cwt.txt: Is used to generate the CWT curve in Fig.5 (b). 8) fig5-a-tr.txt: Is used to generate the TR curve in Fig.5 (a). 9) fig5-b-tr.txt: Is used to generate the TR curve in Fig.5 (b). 10) fig5-a-stft.txt: Is used to generate the STFT curve in Fig.5 (a). 11) fig5-b-stft.txt: Is used to generate the STFT curve in Fig.5 (b). 12) fig6-blue.txt: Is used to generate the blue curve in Fig.6. 13) fig6-green.txt: Is used to generate the green curve in Fig.6. 14) fig6-red.txt: Is used to generate the red curve in Fig.6. 15) fig8-lung-cancer.txt: The 1st, 2nd and 3rd columns represent the frequency range, the real part of the relative permittivity and the conductivity respectively for the lung cancer in Fig.8. 16) fig8-lung.txt: The 1st, 2nd and 3rd columns represent the frequency range, the real part of the relative permittivity and the conductivity respectively for the healthy lung in Fig.8. 17) fig9-a.txt: Is used to generate Fig.9 (a) which is a 265X490 2D plot. 18) fig9-b.txt: The 1st & 2nd columns represent the x and y axis respectively. The third column is used to generate Fig.9 (b) which is a 265X490 2D plot. 19) fig9-c.txt: Is used to generate Fig.9 (c) which is a 265X490 2D plot

Evaluation of students′ perception in using electronic dental records

Introduction: The current study was initiated in order to evaluate the students′ perception of an electronic dental record (EDR). Materials and Methods: A digital based survey questionnaire was developed and validated for evaluating the EDR system. The questions covered the demographic data, addressed the perceptions of the students to the system and the extent of students′ satisfaction toward the system. Results: A total of 290 participated with a response rate of 48%. The results indicated that there was a presence of positive attitude among students toward the EDR system leading to an increase in the level of satisfaction with the system. There was a significant difference between the average satisfaction for male and female students for the benefit of male students, with an average satisfaction score of (4.09) compared to average satisfaction score of (3.74) for female students. Conclusion: The survey has noticed an increase in quality of patient care due to improved oversight of patient management and the ability to more efficiently monitor treatment outcomes. By providing a coordinated delivery of clinical services, the EDR system has been accepted as an enabling technology that allows users to pursue more advanced practices than would be possible with paper-based records