Conditional Random Fields (CRFs) encounter computational difficulties in the presence of a graph with high treewidth. This paper introduces a new type of model, the Crossover Random Field (XRF), designed to cope with these difficulties. An XRF consists of a sequence of “layers”, each of which is a tractable CRF. Inference of marginals takes place layer by layer, with the marginals from one laye...

Zinc is an essential element that can be found in bones, such as calcium and phosphorus. It seems to have effects on growth, bone turnover and mineralization making its relationship with bones still opening. The goal of this study is, by XRF analysis, characterized bone samples, with and without pathology, in the trabeculae region. For that purpose, it was used an XRF beam line at the Synchrotr...

Confocal X-ray fluorescence (XRF) spectrometry can be used to perform three-dimensional elemental analysis, which is impossible using general micro XRF without any collimating optics in the detection channel. In this study, we designed, for first time, a new confocal line (C-L-XRF) system that obtain information of larger area and higher intensity analysis than conventional point (C-P-XRF) anal...

RECENT DEVELOPMENTS IN HANDHELD X-RAY FLUORESENCE INSTRUMENTATION The introduction of new large area silicon drift detectors to handheld XRF technology expands technique capabilities with greater analytical range and lower detection limits James Pasmore, Director, Business Development [email protected] Thermo Niton Analyzers LLC Thermo Fisher Scientific 900 Middlesex Turnpike, Buil...

Nano-MgO was successfully deposited on titania using deposition-precipitation method. The catalyst produced was characterised using FTIR, XRD, BET and XRF and its activity was tested on the transesterification reaction of soybean oil to biodiesel. The catalyst activity improved when the reaction temperature was increasedfrom 150 and 225 C. It was also observed that increasing the reaction time ...

Introduction: The Stardust mission to comet Wild 2 has provided numerous extraterrestrial particles and resulting 'tracks' of finer particles in melted silica aerogel [1]. We have utilized a combination of Laser Confocal Scanning Microscopy (LCSM) and Synchrotron X-Ray Fluorescence (XRF) to characterize a variety of whole tracks both morphologically and chemically, all in 3-dimensions [2]. The ...

A new method to measure the trace elemental composition of size-resolved airborne particles that uses acetone extraction followed by ICPMS analysis is compared to three other established methods: copper anode XRF, molybdenum anode XRF, and an ICPMS method that uses HF digestion. The method detection limit (MDL), accuracy, and precision of each method is studied through the analysis of ambient s...