Analysis of the Major Gravity and Magnetic Anomalies Centred About Bathgate, Central Scotland

A Bouguer anomaly map and an aeromagnetic map (Map 1 and 5) are presented for the central part of the Midland Valley of Scotland as a basis for a combined interpretation of a prominent anomaly centred near Bathgate. The gravity data are compiled from surveys carried out by I. G. S., Cotton, Qureshi, and Bullerwell and Phemister. The aeromagnetic map is part of the Great Britain and Northern Ireland, sheet 11 (scale 1:250,000) published by I. G. S. On the basis of qualitative analysis and geological argument, two limiting case models for the main anomaly are proposed for qualitative investigation. Model 1 consists of Carboniferous lavas in continuity with an intrusion of identical geophysical properties as the magnetic source. Model 2, however, attributes the whole magnetic anomaly, after some smoothing by upward continuation, to a deep intrusion. The Bouguer anomaly Map is corrected for the effect of known basins of Carboniferous sediments above the lavas filling the basins with material of Lower Old Red Sandstone density. The principal remaining components of the gravity field are considered by combining the pseudogravity anomalies, calculated from magnetic anomalies and scaled to +10 mgal for two density contrasts (+0.11 g/cm3 for shallow model and +0.45 g/cm for deeper model), with the regional gravity anomaly, projected from Western Midland Valley of Scotland. This is done after adjusting for a base level shift of 15 mgal which may arise from a NE regional gradient and/or a component of the gravity effect of the Lower Old Red Sandstone basin. The density contrasts which must be used for Model 1 and 2 suggest that the rocks are basic if the model is shallow and ultra-basic if the source is deeper

Infrared Dynamics of a Large N QCD Model, the Massless String Sector and Mesonic Spectra

A consistency check for any UV complete model for large N QCD should be, among other things, the existence of a well-defined vector and scalar mesonic spectra. In this paper, we use our UV complete model in type IIB string theory to study the IR dynamics and use this to predict the mesonic spectra in the dual type IIA side. The advantage of this approach is two-fold: not only will this justify the consistency of the supergravity approach, but it will also give us a way to compare the IR spectra and the model with the ones proposed earlier by Sakai and Sugimoto. Interestingly, the spectra coming from the massless stringy sector are independent of the UV physics, although the massive string sector may pose certain subtleties regarding the UV contributions as well as the mappings to actual QCD. Additionally, we find that a component of the string landscape enters the picture: there are points in the landscape where the spectra can be considerably improved over the existing results in the literature. These points in the landscape in-turn also determine certain background supergravity components and fix various pathologies that eventually lead to a consistent low energy description of the theory.Comment: 47 pages, 7 pdf figures, 24 tables, JHEP format; Detailed mathematica file of the computations is available on request; Version 2: Text elaborated, typos corrected, a new appendix added to discuss the regimes of validity, and a word in the abstract changed. Results unchanged. Final version to appear in JHE

de Sitter Vacua in Type IIB String Theory: Classical Solutions and Quantum Corrections

We revisit the classical theory of ten-dimensional two-derivative gravity coupled to fluxes, scalar fields, D-branes, anti D-branes and Orientifold-planes. We show that such set-ups do not give rise to a four-dimensional positive curvature spacetime with the isometries of de Sitter spacetime. We further argue that a de Sitter solution in type IIB theory may still be achieved if the higher-order curvature corrections are carefully controlled. Our analysis relies on the derivation of the de Sitter condition from an explicit background solution by going beyond the supergravity limit of type IIB theory. As such this also tells us how the background supersymmetry should be broken and under what conditions D-term uplifting can be realized with non self-dual fluxes.Comment: 44 pages, pdfLaTex; v2: Arguments in sec 3.2 more streamlined, figure removed, discussions on quantum corrections elaborated, typos corrected and references added; v3: Improved discussions on the O-planes contributions. Conclusions unchanged. Final version to appear in JHE

EXPECTATIONS AND REALITY: VIDEO GAMES IN EDUCATION FROM TEACHERS' PERSPECTIVE

Games integration could be a catalyst for changing pedagogical practices. however, the effectiveness of using video games in education depend on teacher’s acceptance to use video games in their classroom. The purpose of this quantitative study was to investigate Saudi teachers’ perspective toward video game integration in education at elementary, middle, and high schools’ levels in Saudi Arabia; and found differences in teachers’ attitudes between gender and teachers experiences and level of teaching. It also investigated relationships between teachers’ philosophy based on three main learning theories (behaviorism, cognitivism, and constructivism) and their perspectives toward video game use in the classroom. There were 930 male and female teachers who participated in the study. Overall, the results of this study showed Saudi teachers’ attitudes toward video games were fairly positive. Analysis found a relationship between teachers’ philosophy of teaching and their perspectives toward using video games in their classroom for learning. A moderate negative correlation was found between behaviorist philosophy and teachers’ attitudes. On the other hand, there was a moderate positive correlation between cognitivism and constructivism philosophies Saudi teachers’ attitudes toward using video games in classrooms