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Lean Six-Sigma in Aviation Safety: An implementation guide for measuring aviation system’s safety performance
The paper introduces a conceptual framework that could improve the safety performance measurement process and ultimately the aviation system safety performance. The framework provides an implementation guide on how organisations could design and develop a proactive, measurement tool for assessing and measuring the Acceptable Level of Safety Performance (ALoSP) at sigma (σ) level, a statistical measurement unit. In fact, the methodology adapts and combines quality management tools, a leading indicators programme and Lean-Six Sigma methodology to formally measure and continuously improve a stable and in-control safety management process by reducing safety defects and variability from core organisational processes and objectives. The implementation guide was empirically tested and validated with data collected and analysed within a period of nine months by the safety department of a complex aviation organisation operating a large transport aircraft fleet
Theory of the magnetoeletric effect in a lightly doped high-Tc cuprate
In a recent study Viskadourakis et al. discovered that extremely underdoped
La_2CuO_(4+x) is a relaxor ferroelectric and a magnetoelectric material at low
temperatures. It is further observed that the magnetoelectric response is
anisotropic for different directions of electric polarization and applied
magnetic field. By constructing an appropriate Landau theory, we show that a
bi-quadratic magnetoelectric coupling can explain the experimentally observed
polarization dependence on magnetic field. This coupling leads to several novel
low-temperature effects including a feedback enhancement of the magnetization
below the ferroelectric transition, and a predicted magnetocapacitive effect.Comment: 5 pages, 4 figure
Mesothelioma: t(14;22)(q32;q12) in mesothelioma
Short communication on t(14;22)(q32;q12) in mesothelioma with data on clinics
Penetration Depth Measurements in MgB_2: Evidence for Unconventional Superconductivity
We have measured the magnetic penetration depth of the recently discovered
binary superconductor MgB_2 using muon spin rotation and low field
-susceptibility. From the damping of the muon precession signal we find the
penetration depth at zero temperature is about 85nm. The low temperature
penetration depth shows a quadratic temperature dependence, indicating the
presence of nodes in the superconducting energy gap.Comment: 4 pages 3 figure
Large Positive Magnetoresistance of the Lightly Doped La_{2}CuO_{4} Mott Insulator
The in-plane and out-of-plane magnetoresistance (MR) of single crystals of
La_2CuO_4, lightly doped (x=0.03) with either Sr (La_{2-x}Sr_xCuO_4) or Li
(La_2Cu_{1-x}Li_xO_4), have been measured in the fields applied parallel and
perpendicular to the CuO_2 planes. Both La_{1.97}Sr_{0.03}CuO_4 and
La_2Cu_{0.97}Li_{0.03}O_4 exhibit the emergence of a positive MR at
temperatures (T) well below the spin glass (SG) transition temperature T_{sg},
where charge dynamics is also glassy. This positive MR grows as T->0 and shows
hysteresis and memory. In this regime, the in-plane resistance R_{ab}(T,B) is
described by a scaling function, suggesting that short-range Coulomb repulsion
between two holes in the same disorder-localized state plays a key role at low
T. The results highlight similarities between this magnetic material and a
broad class of well-studied, nonmagnetic disordered insulators.Comment: 5+ pages, 3 figures; published versio
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