This paper is a continuation of the study of the advection–diffusion problem for stratospheric flow, and deals with the probability distribution function (PDF) of gradients of a freely decaying passive tracer. Theoretical arguments are reviewed and extended showing that mixing of a weakly diffused tracer by random large-scale flows produces a tracer gradient field whose probability distribution...

UNLABELLED PET allows for quantitative, regional myocardial perfusion imaging. The short half-lives of the perfusion tracers currently in use limit their clinical applicability. Here, the biodistribution and imaging quality of a new 18F-labeled myocardial perfusion agent (18F-BMS-747158-02) in an animal model are described. METHODS The biodistribution of 18F-BMS-747158-02 was determined at 10...

Short term nitrogen uptake dynamics in the marshes of the southern Everglades, USA, were determined through implementation of a field mesocosm and isotopic enrichment method. The approach was tested using six mesocosms, three enriched with a 300% N tracer, Ca(NO3)2 (6 98% N) and three unenriched mesocosms. This N tracer technique allowed the determination of nitrogen fluxes between key ecosyste...

Numerical simulation of tracer testing data is conducted based on hydrogeology parameters inferred from pressure interference data. By incorporating both of pressure interferences and tracer testing data, pertinent values of average fracture spacing and rock-matrix permeability can be estimated. Relatively good match of tracer return curves are obtained. It is necessary to assign very small fra...

We find that tracer material can be concentrated into invariant regions of flows due exclusively to transient effects, as are produced when tracers temporarily become more buoyant than the surrounding fluid. This can occur either as a single event, e.g., if the tracer is initially weakly buoyant, or under periodic forcing, e.g., when external effects (such as solar heating) change the tracer de...

Abstract We study the performance of perturbative bias expansion when combined with multi-tracer technique, and their impact on extraction cosmological parameters. consider two populations tracers large-scale structure perform a series Markov chain Monte Carlo analysis for those separately. The constraints in ω cdm h using are less biased approximately 60% better than obtained single tracer. ap...

We describe the preliminary characterization of GnRH-binding protein(s) in human placental cytosol. Samples were analysed by chromatography on Sephadex G25. Radiolabelled GnRH and its analogues elute significantly later than the total column volume (V(t)) on Sephadex G25 column chromatography. However, incubation of GnRH II or GnRH agonist tracers with human placental cytosol reduced the intact...

A perfluorocarbon tracer system (PERTRAS), specifically designed for Lagrangian aircraft experiments, has been developed by the Deutsches Zentrum für Luftund Raumfahrt (German Aerospace Center, DLR). It consists of three main parts: a tracer release unit (RU), an adsorption tube sampler (ATS), and a tracer analytical system. The RU was designed for airborne tracer release experiments; meanwhile...

ABSTRACT: A multiresolution AHB on-chip bus tracer named SYS-HMRBT (AHB multiresolution bus tracer) for versatile system-on-chip (SoC) debugging and monitoring. The bus tracer is capable of capturing the bus trace with different resolutions, all with efficient built-in compression mechanisms, to meet a diverse range of needs. Experiments show that the bus tracer achieves very good compression r...

Diffuse fluorescence tomography requires high contrast-to-background ratios to accurately reconstruct inclusions of interest. This is a problem when imaging the uptake of fluorescently labeled molecularly targeted tracers in tissue, which can result in high levels of heterogeneously distributed background uptake. We present a dual-tracer background subtraction approach, wherein signal from the ...