This dissertation covers the two major parts of my Ph.D. research: i) developing a theoretical framework of complex networks and applying simulation and numerical methods to study the robustness of the network system, and ii) applying statistical physics concepts and methods to …
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Forced frequency stabilization techniques of self-injection locking (SIL) and self-phase locked loop (SPLL) have been demonstrated to be effective for phase noise reduction. In SIL scheme, a portion of the oscillator output is directly injected back to the oscillator after passi…
Tajikistan is a small country located in central Asia which is rich in Aromatic medicinal plants. A large number of locally available plants species are used in the preparation of traditional medicines. However, research on essential oils of medicinal and aromatic plants from Ta…
Activation of naïve T and B cells occurs only within the context of organized lymphoid tissues. Thus, the continuous recirculation of mature lymphocytes and their entry into the LNs are crucial for the development of a primary immune response to foreign antigens, as well as the …
In this work, a comparison study was done between different samples of activated carbon (AC) and multi-walled carbon nanotubes (MWCNT) for bromate (BrO3-) removal from water. MWCNT samples were prepared in KFUPM laboratories through specific procedures, and then all these sample…
The results from this study show that during the middle Amazonian period (2 Ga), Arabia Terra did exhibit glacial and fluvial activity as predicted by the Global Circulation Model. Arabia Terra is the largest expanse of ancient terrain north of the Martian equator. Arabia Terra …
Chemotaxis is the movement of a cell or an organism towards or away from a chemical. The movement of bacteria like Escherichia coli is done by flagella-driven swimming. The mode of swimming is dependent on the direction of flagellar rotation, which is controlled by a switch at t…
Effective policymaking requires understanding the causal effects of competing proposals. Relevant causal quantities include proposals' expected effect on different groups of recipients, the impact of policies over time, the potential trade-offs between competing objectives, and,…
Spintronics is an emerging field of electronics with the potential to be used in future integrated circuits. Spintronic devices are already making their mark in storage technologies in recent times and there are proposals for using spintronic effects in logic technologies as wel…
Middle Eastern women have made important contributions in the field of Mathematics. The purpose of this thesis is to understand the educational background for women in the Middle East and look at the life and contribution of a sample of women mathematicians in representative Mid…
Eighth grade Turkish students' mental models about the nature of magnets and magnetic interactions were examined in this research study. Using an interpretive qualitative design, I conducted this study in a middle school with thirty-one Turkish students who have not had any form…
This dissertation includes three essays that examine international migration in the former Soviet Union. Chapter 2 uses an endogenous growth model to explore the impact of remittances on growth in FSU countries. In this chapter, we model how output per capita, investment and con…
Cells express a variety of proteins on their surface that allows them to sample the world. These proteins are embedded in the plasma membrane, a bilayer of lipids that surrounds the cell. Since the lipid and protein dimensions are in the nanometer range, they are subject to ther…
Interacting one-dimensional electron systems are generally referred to as "Luttinger liquids", after the effective low-energy theory in which spin and charge behave as separate degrees of freedom with independent energy scales. The "spin-incoherent Luttinger liquid" describes a …
A finite volume method for computer simulations of fluids obeying the equation of Bhatnagar, Gross, and Krook (BGK) for ideal fluids is described. The theory is extended to deal with non-ideal fluids. An approach for modeling a van der Waal's fluid is developed and the results o…
We have used X-ray and both GeV and TeV gamma-ray temporal data to conduct a probe into possible Lorentz invariance violation dispersion effects, as well as to look into possible correlations between different energy bands in blazar emission. Some quantum gravity models predict …
Low contrast in x-ray attenuation imaging between different materials of low electron density is a limitation of traditional x-ray radiography. Phase contrast imaging offers the potential to improve the contrast between such materials, but due to the requirements on the spatial …
Piezoelectric technology is the backbone of most medical ultrasound imaging arrays, however, in scaling the technology to sizes required for high frequency operation (> 20 MHz), it encounters substantial difficulties in fabrication and signal transduction efficiency. These limit…
Al-Kashi's 1427 Key to Arithmetic had important use over several hundred years in mathematics teaching in Medieval Islam throughout the time of the Ottoman Empire. Its pedagogical features have never been studied before. In this dissertation I have made a close pedagogical analy…