Positive Polynomials on Riesz Spaces

We prove some properties of positive polynomial mappings between Riesz spaces, using finite difference calculus. We establish the polynomial analogue of the classical result that positive, additive mappings are linear. And we prove a polynomial version of the Kantorovich extension theorem.Comment: 12 page

Development of a micro flow sensor for microfluidic systems

This paper was presented at the 3rd Micro and Nano Flows Conference (MNF2011), which was held at the Makedonia Palace Hotel, Thessaloniki in Greece. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, Aristotle University of Thessaloniki, University of Thessaly, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute.A micro flow sensor based on the thermotransfer principle is developed here. The sensor consists of a micro heater with a micro thermocouple downstream of the heater. The flow sensor is microfabricated in a three step process: (a) micro heater and thermocouple fabrication, (b) microchannel fabrication and (c) system integration. The micro flow sensor was characterized using a mixture of 50% methanol and 50% water. The flow rate in the microchannel was controlled using a syringe pump. The sensor was calibrated using a pulse heat input. The results show that the sensor was sensitive for flow in the range 0.5μl/min to 0.7ml/min

On-column 2p bound state with topological charge \pm1 excited by an atomic-size vortex beam in an aberration-corrected scanning transmission electron microscope

Atomic-size vortex beams have great potential in probing materials' magnetic moment at atomic scales. However, the limited depth of field of vortex beams constrains the probing depth in which the helical phase front is preserved. On the other hand, electron channeling in crystals can counteract beam divergence and extend the vortex beam without disrupting its topological charge. Specifically, in this paper, we report atomic vortex beams with topological charge \pm1 can be coupled to the 2p columnar bound states and propagate for more 50 nm without being dispersed and losing its helical phase front. We gave numerical solutions to the 2p columnar orbitals and tabulated the characteristic size of the 2p states of two typical elements, Co and Dy, for various incident beam energies and various atomic densities. The tabulated numbers allow estimates of the optimal convergence angle for maximal coupling to 2p columnar orbital. We also have developed analytic formulae for beam energy, convergence-angle, and hologram dependent scaling for various characteristic sizes. These length scales are useful for the design of pitch-fork apertures and operations of microscopes in the vortex-beam imaging mode.Comment: 30 pages, 7 figures, Microscopy and Microanalysis, in pres

Feed system design and experimental results in the uhf model study for the proposed Urbana phased array

The effects of atmospheric turbulence and the basis for the coherent scatter radar techniques are discussed. The reasons are given for upgrading the Radar system to a larger steerable array. Phase array theory pertinent to the system design is reviewed, along with approximations for maximum directive gain and blind angles due to mutual coupling. The methods and construction techniques employed in the UHF model study are explained. The antenna range is described, with a block diagram for the mode of operation used

Book reviews

Teaching/Communication/Extension/Profession,

Synthesis of α,β-diamino acid derivatives via asymmetric Mannich reactions of glycine imino esters catalyzed by a chiral phosphoramidite·silver complex

AgOTf·phosphoramidite complexes efficiently catalyze the enantioselective Mannich-type reaction between benzophenone-imine glycine methyl ester and N-tosyl aldimines in the absence of a base. The corresponding syn-adducts, which are the direct precursors of α,β-diamino acids, are obtained with moderate to good syn-diastereoselectivities (up to 9:1) and high enantioselectivities (up to 99% ee).This work has been supported by the Spanish Ministerio de Ciencia e Innovación (MICINN) (Consolider INGENIO 2010 CSD2007-00006, CTQ2010-20387, CTQ2013-43446-P), FEDER, Generalitat Valenciana (PROMETEO/2009/039, and PROMETEOII 2014/017), and by the University of Alicante. L. S. thanks University of Edinburgh for an ERASMUS fellowship

Column ratio mapping: a processing technique for atomic resolution high angle annular dark field(HAADF) images

An image processing technique is presented for atomic resolution high-angle annular dark-field (HAADF) images that have been acquired using scanning transmission electron microscopy (STEM). This technique is termed column ratio mapping and involves the automated process of measuring atomic column intensity ratios in high-resolution HAADF images. This technique was developed to provide a fuller analysis of HAADF images than the usual method of drawing single intensity line profiles across a few areas of interest. For instance, column ratio mapping reveals the compositional distribution across the whole HAADF image and allows a statistical analysis and an estimation of errors. This has proven to be a very valuable technique as it can provide a more detailed assessment of the sharpness of interfacial structures from HAADF images. The technique of column ratio mapping is described in terms of a [1 1 0]-oriented zinc-blende structured AlAs/GaAs superlattice using the 1 Å-scale resolution capability of the aberration-corrected SuperSTEM 1 instrument

European Monitoring of Congenital Anomalies: JRC-EUROCAT Report on Statistical Monitoring of Congenital Anomalies (2006 – 2015)

Worldwide, congenital anomalies are a leading cause of fetal death, infant mortality and morbidity in childhood. Of the 5.2 million births in the European Union (EU) each year, approximately 104,000 (2.5%) will be born with congenital anomalies. EUROCAT is a European network of population-based registries whose objectives are to provide essential epidemiologic information on congenital anomalies in Europe, to facilitate the early warning of new teratogenic exposures and to evaluate the effectiveness of primary prevention. Each year, EUROCAT performs statistical monitoring for both trends and clusters in time on 82 anomaly subgroups. Statistical monitoring relates to two of EUROCAT’s objectives: to provide essential epidemiologic information on congenital anomalies in Europe and to co-ordinate the detection of, and response to, clusters and early warning of teratogenic exposures. The results of the statistical monitoring are the basis for possible further investigations at the local registry level. In 2015 the Central Registry of EUROCAT was transferred from the University of Ulster to the JRC, and became part of the European Platform on Rare Diseases Registration. This is the first time the statistical monitoring has been performed by the JRC-EUROCAT Central registry. We report here the results of the monitoring performed on data for the birth years 2006-2015. Cases of congenital anomaly among livebirths, fetal deaths from 20 weeks gestational age and terminations of pregnancy for fetal anomaly (TOPFA) at any gestation were included. We report both the statistical results and, where available, the outcome of preliminary investigations conducted by registries. For each anomaly, the trends in prevalence in each registry are shown and in addition the overall pan-European prevalence by single year of birth. Some congenital anomalies take a while to be reported; therefore the prevalence in the latest data is often underreported. Presenting the overall pan-European prevalence by single year allows for the influence of the most recent data (2015) to be evaluated.JRC.F.1-Health in Societ