Models of MOS and SOS devices

Quarterly report describes progress in three programs: dc sputtering machine for aluminum and aluminum alloys; two dimensional computer modeling of MOS transistors; and development of computer techniques for calculating redistribution diffusion of dopants in silicon on sapphire films

Trends and techniques for space base electronics

A system was developed for depositing aluminum and aluminum alloys by the D.C. sputtering technique. This system which was designed for a high level of cleanliness and ion monitoring the deposition parameters during film preparation is ready for studying the deposition and annealing parameters upon double level metal preparation. The finite element method was studied for use in the computer modeling of two dimensional MOS transistor structures. An algorithm was developed for implementing a computer study which is based upon the finite difference method. The program was modified and used to calculate redistribution data for boron and phosphorous which had been predeposited by ion implantation with range and straggle conditions typical of those used at MSFC. Data were generated for 111 oriented SOS films with redistribution in N2, dry O2 and steam ambients. Data are given showing both two dimensional effects and the evolution of the junction depth, sheet resistance and integrated dose with redistribution time

A study of trends and techniques for space base electronics

A sputtering system was developed to deposit aluminum and aluminum alloys by the dc sputtering technique. This system is designed for a high level of cleanliness and for monitoring the deposition parameters during film preparation. This system is now ready for studying the deposition and annealing parameters upon double-level metal preparation. A technique recently applied for semiconductor analysis, the finite element method, was studied for use in the computer modeling of two dimensional MOS transistor structures. It was concluded that the method has not been sufficiently well developed for confident use at this time. An algorithm was developed for confident use at this time. An algorithm was developed for implementing a computer study which is based upon the finite difference method. The program which was developed was modified and used to calculate redistribution data for boron and phosphorous which had been predeposited by ion implantation with range and straggle conditions. Data were generated for 111 oriented SOS films with redistribution in N2, dry O2 and steam ambients

The Full Factorial Design Approach to Determine the Attitude of University Lecturers towards e-Learning and Online Teaching due to the COVID-19 Pandemic

The purpose of this study was to determine faculty members' attitudes toward online learning in Kurdistan region universities. The study examined the biographic and personal characteristics of the lecturer towards e-learning. The data was collected among faculty members at Cihan University-Sulaimaniya, and to analyze the data, a full factorial design with five main factors at two levels and no central points was applied for this specific purpose. The study's findings indicated that there was no significant relationship between gender and lecturer attitude towards e-learning. In comparison to teachers with an MSc degree, those with a PhD have a more negative attitude toward e-learning. Furthermore, full-time faculty members have a greater positive effect on teachers' attitudes than part-time lecturers. Likewise, the results indicate that lecturers who earned their most recent education degrees outside of Iraq have a more favorable attitude. Similarly, lecturers in the sciences are more favorable to e-learning than those in the arts and social sciences. In addition, the findings demonstrated that the interaction factors (Gender) and (Education Degree) have a negative effect on lecturers' attitudes when they are combined. Besides that, the interaction of factors (Country of Last Education Degree) and (Faculty Member Types) improves attitudes toward e-learning. Based on the results, it is suggested that academic staff receive e-learning training to deepen their knowledge and understanding of such a modern teaching system. There is also a need to enhance factors related to positive attitudes towards e-learning among university lecturers. The findings of this study are necessarily significant to both teachers and educational organizations in Kurdistan Region universities. &nbsp

Search for magnetoelectric monopole response in Cr2_2O3_3 powder

Powder samples have been suggested as a pathway to fabricate isotropic magnetoelectric (ME) materials which effectively only have a pseudoscalar or monopole ME response. We demonstrate that random distribution of ME grains alone does not warrant isotropic ME response because the activation of a non-vanishing ME response requires a ME field cooling protocol which tends to induce preferred axes. We investigate the evolution of ME susceptibility in powder chromia samples for various ME field cooling protocols both theoretically and experimentally. In particular, we work out the theoretical expressions for ME susceptibility for powder Chromia in the framework of statistical mechanics where Boltzmann factors weigh the orientation of the N\'eel vector relative to the local orientation of the c-axis of a grain. Previous approximations oversimplified the thermodynamic nature of the annealing process giving rise to misleading conclusions on the role of the magnitude of the applied product of electric and magnetic fields on the ME response. In accordance with our refined theory, a strong dependence of the functional form of $\alpha$ vs. $T$ of Chromia powders on the ME field cooling protocol is observed. It shows that Chromia powder is not generically an isotropic ME effective medium but provides a pathway to realize the elusive isotropic ME response.Comment: Submitted to Physical Review

Congenital Heart Disease In Preterm Infants

Background: Congenital heart defects and preterm birth  are two important causes of neonatal and infant mortality. However, the relationship between them has not yet been fully clarified. Objective: To find the association of congenital heart disease with premature delivery. Patients and Methods: The study is an observational cross sectional study, done in Al-Batool teaching hospital for maternity and children from July 2022 to January 2023. A self-prepared questionnaire was used to gather data. Gestational age was calculated mainly on postnatal gestational assessment by Dubowitz/Ballard method by a pediatrician. Echocardiography was done by  Echocardiography specialist  doctor to identify the presence and  types of congenital heart defects. SPSS version 25 was used for statistical analysis. Results: Total number of births  (term and preterm) was 1616, congenital heart diseases were detected in 60(3.71%) of them, most of them were isolated heart defect. In preterm babies, the congenital heart diseases were detected in 8% (p value was <0.001), they were of different types as followings: patent ductus arteriosus (n=10,26%), atrial septal defect (n=8,21%), ventricular septal defect (n=7,18%), transposition of the great arteries (n=4,10%), tetralogy of Fallot (n=2,5%), and complex of congenital  heart disease (n=7,18%), while in full term babies, the rate of congenital heart diseases was only 1.9%. Conclusion: The incidence of congenital heart disease was higher in preterm than full term delivered babies, mostly in the group of transposition of the great arteries, ventricular septal defect, complex heart defects, followed by atrial septal defect

The Effect of Adding Stiffener on Deflection of Loading Arm by Using BEM & FEM

In this study we are concerned to improve the deflection of the loading arm with new suggested style , where the BEM techniques has been used to estimate a deflection at each distance (x) for the main part of loading arm pipe (3'') , thereafter a simplified stiffener has been added to optimize a moment of inertia of this main part thereby the deflection will be better , for this purpose a case study has been considered according to international standard for the pipe specification that  investigated to illustrate the goal of this work, adding to this ANSYS  program  has been used to verify the calculation