ASETS – An Academic Trading Simulation Platform

This paper is intended to present the results of our academic research upon a distributed computing environment dedicated to trading simulation. Our research has been conducted with the aim of creating a trading simulation platform, that would provide both the foundation for future experiments with trading systems architectures, components, APIs, and the framework for research on trading strategies, trading algorithms design, and equity markets analysis tools.Trading Systems, Simulation, Distributed Computing, Service-Oriented Architecture (SOA), Message-Oriented Middleware (MOM), Java Message Service (JMS)

A systematic study of HDDR processing conditions for the recycling of end-of-life Nd-Fe-B magnets

Scrap rare earth permanent magnets from various sources and applications were collected and processed for recycling using hydrogen decrepitation (HD) and hydrogenation disproportionation desorption and recombination (HDDR) processes. The effects of the principle HDDR processing parameters hydrogen pressure, hydrogen desorption rate and temperatures on the magnetic properties of the recycled materials have been investigated systematically. The optimum hydrogen pressures required for the complete disproportionation of the various magnet compositions were determined. We found that a hydrogen heat treatment composed of two steps (780 °C and 840 °C) and a moderate desorption rate can be used for the magnets having a higher Dy and Co content to obtain high quality anisotropic HDDR powders for resin bonded magnet production

Ce and La as substitutes for Nd in Nd2Fe14B-based melt-spun alloys and hot-deformed magnets: A comparison of structural and magnetic properties

Ce and La as very cheap rare-earth elements were used to substitute Nd in nanocrystalline melt-spun ribbons of nominal compositions (Nd1−xREx)13.6FebalCo6.6Ga0.6B5.6 (x = 0, 0.1, 0.2, … 1 for RE = Ce) and (x = 0, 0.1, 0.2, … 0.5 for RE = La). Ce substitution gradually decreased the Nd2Fe14B lattice constants and produced CeFe2 segregation from x = 0.7. La substitution led to lattice expansion along the c-axis and induced segregation of α-Fe and Nd2Fe17 at x = 0.5. Grain coarsening was observed in the Ce-substituted samples while La was found to suppress grain growth. Cerium worsened the magnetic properties of as-spun powders after an initial improvement in (Nd0.9Ce0.1)13.6FebalCo6.6Ga0.6B5.6 alloy which showed a coercivity (µ0Hc) of 1.54 T and a remanence (Br) of 0.81 T. Coercivity dropped with increasing La concentration but remanence increased from 0.73 T in the base composition to 0.88 T at x = 0.3. The Curie temperatures (TC) showed a slight decrease in both cases until x = 0.4. It then dropped abruptly for increasing Ce fractions and increased at x = 0.5 La. For x = 0.2 and 0.3 Ce and x = 0.2 La fractions, the melt-spun samples were further processed by hot-pressing and hot-deformation. The hot-pressed (Nd0.8La0.2)13.6FebalCo6.6Ga0.6B5.6 alloy measured lower coercivity but increased remanence comparing to the Ce-substituted alloys. However, this composition responded poorly to hot-deformation, severe cracking being induced in the process. Due to enhanced hot-workability, best magnetic properties were obtained after deformation for the (Nd0.7Ce0.3)13.6FebalCo6.6Ga0.6B5.6 alloy (µ0Hc = 1.09 T, Br = 0.97 T and energy product (BH)max = 170 kJ/m3)

Identification and recovery of rare-earth permanent magnets from waste electrical and electronic equipment

info:eu-repo/semantics/publishe

Recyclingverfahren zur Herstellung isotroper, magnetischer Pulver

Die vorliegende Erfindung betrifft Recyclingverfahren zur Herstellung von isotropen, magnetischen Pulvern umfassend die Schritte: a) Bereitstellen einer magnetischen Legierung umfassend a1) zumindest ein Seltenerdmetall, a2) zumindest ein Übergangsmetall und a3) Bor; b) Hydrierung der Legierung aus Schritt a) in einer wasserstoffhaltigen Atmosphäre bei Temperaturen von 0 bis 600°C und einem Wasserstoffpartialdruck von 10000 bis 15000000 Pa, unter Bildung von einkristallinen Partikeln; c) Disproportionierung der Partikel aus Schritt b) in einer wasserstoffhaltigen Atmosphäre bei Temperaturen im Bereich von größer 600 bis 1000°C bei einem Wasserstoffpartialdruck von 30000 bis 1000000 Pa; d) Desorption des Wasserstoffs und anschließende Rekombination unter Bildung isotroper Pulverpartikel; wobei es sich bei der in Schritt a) bereitgestellten Legierung teilweise oder vollständig um Altmagnetmaterial handelt. Weiterhin betrifft die vorliegende Erfindung über diese Verfahren herstellbare Pulver und deren Verwendung

Negative association between paraoxonase 2, anthropometric markers and metabolic syndrome

Background Metabolic syndrome (MS) has a great impact on cardiovascular mortality and morbidity. Our aim was to investigate the association of MS with some oxidant and antioxidant markers, including pro-and antioxidant status of peripheral blood mononuclear cells (PBMC) in newly diagnosed type 2 diabetic mellitus patients (ND-T2D). Methods 219 ND-T2D and 88 healthy subjects were divided in two groups according to the absence or presence of MS. Anthropometric measurements, routine blood tests, total oxidant status (TOS), total antioxidant status (TAS) and ELISA measurements were included. The PBMC capacity to release free radicals and to neutralize them was also determined by measuring the respiratory burst (RB) together with the lactonase activity of the intracellular antioxidant enzyme paraoxonase 2 (PON2). Results Comparing ND-T2D MS+ with those MS- the RB of the PBMC was significantly higher (p<0.05) while lactonase PON2 enzymatic activity was decreased (p < 0.001). A negative correlation of RB was found with TAS (r = -0.416, p < 0.05). PON2 was also negatively correlated with glycaemia (r = -0.275, p < 0.001), HbA1c (r = -0.308, p < 0.001), weight (r = -0.183; p < 0.05), waist circumference (r = -0.353, p < 0.001) and body mass index (r = -0.290, p < 0.001). Conclusion PON2 lactonase activity is negatively associated with anthropometric markers in ND-T2D with MS