HF-induced airglow at magnetic zenith: theoretical considerations

Hf Pump-induced Electron Heating and Artificial Airglow at Highlatitudes: Aspect Angle Dependence

Large electron temperature increases (~3000 K) in the ionospheric F-region, produced by powerful HF wave injection, were measured using the EISCAT incoherent scatter radar near Tromsø, Norway, on 7 October 1999. Magnetic fieldaligned measurements showed HF-initiated ion outflows reaching several hundred ms at 580 km. When scanning the radar antenna from field-aligned (77.2o southward) to vertic...

From Men to Mice: Theoretical Considerations for Edema Imaging at Ultra-High Magnetic Fields

Introduction: T2-weighted magnetic resonance imaging (T2w-MRI) has been shown to visualize and to quantify edema in the acutely infarcted myocardium (AIM) in humans (e.g. [1, 2]), and in animal models such as pigs [3] or dogs [4]. The contrast in T2w-MRI is based on the increase in T2 in the injured area of the heart compared to normal (‘remote’) myocardium. Ischemia-reperfusion injury mouse mo...

Designing and Constructing a Magnetic Stimulator: Theoretical and Practical Considerations

Tropospheric Range Error at the Zenith

The atmospheric range error in an electromagnetic signal arriving vertically at the earth is measured by the height integral of the refractivity N through the atmosphere. (N = 10^ (n-1) where n is the index of refraction.) N in the non-ionized atmosphere is the sum of "dry" and "wet" components, which are considered separately. Only the dry part is important at optical wavelengths,and the prese...

Semantic interoperability : Theoretical Considerations

The achievement of semantic interoperability is a complex task, which affects multiple levels and functions of information systems and the information process. In this section, we propose a systematic requirements analysis of the different constituent functions necessary to achieve overall semantic interoperability in a DL environment. We begin with a clarification of terminology that tends to ...