Invariance of the parity conjecture for p-Selmer groups of elliptic curves in a D2pnD_{2p^n}-extension

In section 2, we show a $p$-parity result in a $D_{2p^{n}}$-extension of number fields $L/K$ ($p\geq 5$) for the twist $1\oplus \eta \oplus \tau$: W(E/K,1\oplus \eta \oplus \tau)=(-1)^{}, where $E$ is an elliptic curve over $K,$ $\eta$ and $\tau$ are respectively the quadratic character and an irreductible representation of degree 2 of $Gal(L/K)=D_{2p^{n}},$ and $X_{p}(E/L)$ is the $p$-Selmer group. The main novelty is that we use a congruence result between $$-factors (due to Deligne) for the determination of local root numbers in bad cases (places of additive reduction above 2 and 3). We also give applications to the $p$-parity conjecture (using the machinery of the Dokchitser brothers).Comment: 19 page

A mathematical model of the circle of Willis in the presence of an arteriovenous anomaly

AbstractThis paper deals with a complete model of the flow in the Willis circle and its vicinity. We study: (a) the normal case; and (b) the influence of the presence of an arteriovenous anomaly. We have simulated the therapeutic procedures in order to confirm the treatment

Is there more room to negotiate with the IMF on fiscal policy?

This repository item contains a working paper from the Boston University Global Economic Governance Initiative. The Global Economic Governance Initiative (GEGI) is a research program of the Center for Finance, Law & Policy, the Frederick S. Pardee Center for the Study of the Longer-Range Future, and the Frederick S. Pardee School of Global Studies. It was founded in 2008 to advance policy-relevant knowledge about governance for financial stability, human development, and the environment.During the 1980s the IMF emerged as a global “bad cop,” demanding harsh austerity measures in countries faced with debt problems. Has the Great Recession changed all that? Is there more room to negotiate with the Fund on fiscal policy? The answer is yes. If we take a close look at what the IMF researchers say and what its most influential official reports proclaim, then we can see that there has been a more “Keynesian” turn at the Fund. This means that today one can find arguments for less austerity, more growth measures and a fairer social distribution of the burden of fiscal sustainability. The IMF has experience a major thaw of its fiscal policy doctrine and well‐informed member states can use this to their advantage. These changes do not amount to a paradigm shift, a la Paul Krugman’s ideas. Yet crisis‐ridden countries that are keen to avoid punishing austerity packages can exploit this doctrinal shift by exploring the policy implications of the IMF’s own official fiscal doctrine and staff research. They can cut less spending, shelter the most disadvantaged, tax more at the top of income distribution and think twice before rushing into a fast austerity package. This much is clear in all of the Fund’s World Economic Outlooks and Global Fiscal Monitors published between 2009 and 2013 with regard to four themes: the main goals of fiscal policy, the basic options for countries with fiscal/without fiscal space, the pace of fiscal consolidation, and the composition of fiscal stimulus and consolidation

Ventricular fibrillation in experimental hypothermic cardiac surgery, the evaluation of antifibrillary agents

Thesis (M.A.)--Boston Universit

BUSM News and Notes

Monthly newsletter providing updates of interest to the Boston University School of Medicine community

Emulation of X-ray Light-Field Cameras

X-ray plenoptic cameras acquire multi-view X-ray transmission images in a single exposure (light-field). Their development is challenging: designs have appeared only recently, and they are still affected by important limitations. Concurrently, the lack of available real X-ray light-field data hinders dedicated algorithmic development. Here, we present a physical emulation setup for rapidly exploring the parameter space of both existing and conceptual camera designs. This will assist and accelerate the design of X-ray plenoptic imaging solutions, and provide a tool for generating unlimited real X-ray plenoptic data. We also demonstrate that X-ray light-fields allow for reconstructing sharp spatial structures in three-dimensions (3D) from single-shot data

3D imaging of theranostic nanoparticles in mice organs by means of x-ray phase contrast tomography

Theranostics is an innovative research field that aims to develop high target specificity cancer treatments by administering small metal-based nanoparticles (NPs). This new generation of compounds exhibits diagnostic and therapeutic properties due to the high atomic number of their metal component. In the framework of a combined research program on low dose X-ray imaging and theranostic NPs, X-ray Phase Contrast Tomography (XPCT) was performed at ESRF using a 3 \u3bcm pixel optical system on two samples: a mouse brain bearing melanoma metastases injected with gadolinium NPs and, a mouse liver injected with gold NPs. XPCT is a non-destructive technique suitable to achieve the 3D reconstruction of a specimen and, widely used at micro-scale to detect abnormalities of the vessels, which are associated to the tumor growth or to the development of neurodegenerative diseases. Moreover, XPCT represents a promising and complementary tool to study the biodistribution of theranostic NPs in biological materials, thanks to the strong contrast with respect to soft tissues that metal-based NPs provide in radiological images. This work is relied on an original imaging approach based on the evaluation of the contrast differences between the images acquired below and above K-edge energies, as a proof of the certain localization of NPs. We will present different methods aiming to enhance the localization of NPs and a 3D map of their distribution in large volume of tissues