Systems approach provides management control of complex programs

Integrated program management process provides management visual assistance through three interrelated charts - system model that identifies each function to be performed, matrix that identifies personnel responsibilities for these functions, process chart that breaks down the functions into discrete tasks

Double-resonant fast particle-wave interaction

In future fusion devices fast particles must be well confined in order to transfer their energy to the background plasma. Magnetohydrodynamic instabilities like Toroidal Alfv\'en Eigenmodes or core-localized modes such as Beta Induced Alfv\'en Eigenmodes and Reversed Shear Alfv\'en Eigenmodes, both driven by fast particles, can lead to significant losses. This is observed in many ASDEX Upgrade discharges. The present study applies the drift-kinetic HAGIS code with the aim of understanding the underlying resonance mechanisms, especially in the presence of multiple modes with different frequencies. Of particular interest is the resonant interaction of particles simultaneously with two different modes, referred to as 'double-resonance'. Various mode overlapping scenarios with different q profiles are considered. It is found that, depending on the radial mode distance, double-resonance is able to enhance growth rates as well as mode amplitudes significantly. Surprisingly, no radial mode overlap is necessary for this effect. Quite the contrary is found: small radial mode distances can lead to strong nonlinear mode stabilization of a linearly dominant mode.Comment: 12 pages, 11 figures; Nuclear Fusion 52 (2012

Europium-doped calcium pyrophosphates : allotropic forms and photoluminescent properties

In a search for new luminescent biological probes, we synthesized calcium pyrophosphates doped with europium up to an atomic Eu/(Eu+Ca) ratio of 2%. They were prepared by coprecipitating a mixture of calcium and europium salts with phosphate. After heating at 900°C in air, two phases coexisted, identified as the β calcium pyrophosphate form and EuPO4. Heating near 1250°C in air, during the β→ transformation, europium ions substitute for calcium ions in the * calcium pyrophosphate structure as demonstrated by the spectroscopic study. Europium ions with both valence states (divalent and trivalent) were observed in the samples. Following the synthesis procedure, partial reduction of Eu3+ took place even in an oxidizing atmosphere. The 0.5%-doped compound could serve as a sensitive probe in biological applications. Depending on the excitation wavelength, the luminescence occurs either in the red or in the blue regions, which discriminates it from parasitic signals arising from other dyes or organelles in live cells

Disclosing the provenance and production technology of Meroitic ceramics from Sedeinga (Northern Sudan)

openThe provenance and production technology of ceramics is crucial to understanding more about the use of ceramics and the society they were produced by. Ceramics in Sudan and in the Meroitic industry have been analysed for many years, however Sedeinga has never had its ceramics scientifically analysed. Sedeinga is an important site as it is located near the Nubian limit and has a lot of potential in a greater ceramic knowledge in this area. Northern Sudan has been an important area of study for years because of its interaction with the Egyptians and due to the fact that many of the sites have been abandoned since ancient times. The constant research within Nubia gives a huge insight to the Meroitic communities and influence over Sudan. Sedeinga has only more recently been given a lot of attention and this analysis hopes to give more knowledge about the society living here during the Meroitic period. This study will be using past research from other sites throughout Nubia such as Musawwarat es-Sufra and Meroe, to compare the data and see if there is any correlation or interactions like trade with other societies. Sedeinga is studied in the context of an important Meroitic necropolis and specifically excavating the tombs and pyramidal superstructures. For this research scientific methods will be used to analyse the ceramics, such as XFR, XRD, and petrography

My Own Venetian Rose

https://digitalcommons.library.umaine.edu/mmb-vp/2220/thumbnail.jp

A Study of a 90° Vortex-Vortex Scattering Process

Following Ruback, we discuss the evidence for scattering at right angle of two vortices in a head-on collision. The evidence is given in terms of the approximate solutions of the equations of motion. This makes it possible to extend the analysis to the case of a small net repulsive force between the corresponding static vortex configurations.The ordinary differential equations, which result from the ansatz for the approximate solutions, are solved by Taylor series at the origin and by asymptotic series at infinity

Computer programs for saturation properties of hydrogen

Computer programs for saturation properties of liquid and vapor hydroge