A detailed understanding of instanton effects for half-BPS couplings is pursued in theories with 16 supersymmetries. In particular, we investigate the duality between heterotic string on T 4 and type IIA on K3 at the T /Z2 orbifold point, as well as their higher and lower dimensional versions. We present a remarkably clean quantitative test of the duality at the level of F 4 couplings, by compl...

introduction: the purpose of this study was to evaluate and compare canal preparation pattern of k3 and protaper rotary files in curved resin blocks. materials and methods: twenty-four resin blocks were used in this experimental study and randomly divided into two groups. their initial images were scanned. after preparation, their images were scanned again in the same position. pre and post pre...

We describe a computer-based database of polarised K3 surfaces and explain the meaning of the information it contains. In a precise sense, the database includes all K3 surfaces.

The authors investigated differentiation of cultured corneal and limbal epithelial cells by immunochemically evaluating the changes in the profiles of keratins recognized by two monoclonal antibodies: AE5, which recognizes K3, and AE1, which recognizes a group of acidic keratins including K16, which is present in the hyperproliferative cells. After 1 and 2 weeks in culture, the human epithelial...

OBJECTIVE To evaluate morphological changes of the apical surface after root canal preparation with 1 mm beyond the apical foramen using ProTaper Universal (PTU) files, K3 files and Twisted files (TF), respectively. METHODS Seventy teeth with a centered apical foramen and 70 teeth with a deviated apical foramen were included as group A and group B respectively. In each group, 20 teeth were ra...

In this paper we study T 2 compactification of six-dimensional massive type IIA supergravity in presence of Ramond-Ramond background fluxes. The resulting theory in four dimensions is shown to possess SL(2, R)×SL(2, R)×O(4, 20) duality symmetry. It is shown that specific elements of this symmetry relate massive type IIA compactified on K3 × T 2 (fluxes along K3) to the ordinary type IIA compact...

For two graphs T and H and for an integer n, let ex(n, T,H) denote the maximum possible number of copies of T in an H-free graph on n vertices. The study of this function when T = K2 is a single edge is the main subject of extremal graph theory. In the present paper we investigate the general function, focusing on the case T = K3, which reveals several interesting phenomena. Three representativ...

BACKGROUND Recently, we reported an information density theory and an analysis of three-parameter plus shorter scan than conventional method (3P+) for the amyloid-binding ligand [11C]Pittsburgh compound B (PIB) as an example of a non-highly reversible positron emission tomography (PET) ligand. This article describes an extension of 3P + analysis to noninvasive '3P++' analysis (3P + plus use of ...

A (smooth) K3 surface X defined over a field k of characteristic 0 is called singular if the Néron-Severi lattice NS(X) of X ⊗ k is of rank 20. Let X be a singular K3 surface defined over a number field F . For each embedding σ : F →֒ C, we denote by T (Xσ) the transcendental lattice of the complex K3 surface Xσ obtained from X by σ. For each prime ideal p of F at which X has a supersingular red...