We report constraints on spin-independent weakly interacting massive particle (WIMP)-nucleon scattering using a 3.35×10^{4}  kg day exposure of the Large Underground Xenon (LUX) experiment. A dual-phase xenon time projection chamber with 250 kg of active mass is operated at the Sanford Underground Research Facility under Lead, South Dakota (USA). With roughly fourfold improvement in sensitivity for high WIMP masses relative to our previous results, this search yields no evidence of WIMP nuclear recoils. At a WIMP mass of 50  GeV c^{-2}, WIMP-nucleon spin-independent cross sections above 2.2×10^{-46}  cm^{2} are excluded at the 90% confidence level. When combined with the previously reported LUX exposure, this exclusion strengthens to 1.1×10^{-46}  cm^{2} at 50  GeV c^{-2}.

/pdf/results-from-a-search-for-dark-matter-in-the-complete-lux-af6cftto72.pdf

Results from a Search for Dark Matter in the Complete LUX Exposure

We demonstrate control of short and long quantum trajectories in high harmonic emission through the use of an orthogonally polarized two-color field. By controlling the relative phase ϕ between the two fields we show via classical and quantum calculations that we can steer the two-dimensional trajectories to return, or not, to the core and so control the relative strength of the short or long quantum trajectory contribution. In experiments, we demonstrate that this leads to robust control over the trajectory contributions using a drive field from a femtosecond laser composed of the fundamental ω at 800 nm (intensity ∼1.2×10(14)  W cm(-2)) and its weaker orthogonally polarized second harmonic 2ω (intensity ∼0.3×10(14)  W cm(-2)) with the relative phase between the ω and 2ω fields varied simply by tilting a fused silica plate. This is the first demonstration of short and long quantum trajectory control at the single-atom level.

/pdf/trajectory-selection-in-high-harmonic-generation-by-ei3vr7z0e7.pdf

Trajectory selection in high harmonic generation by controlling the phase between orthogonal two-color fields.

In one embodiment, a total pilot injection amount is calculated from the difference between a compressed gas temperature in a cylinder and a fuel self-ignition temperature. As pilot injection, a plurality of instances of divided pilot injection are performed, and by setting the injection amount per one instance of divided pilot injection to an injector minimum limit injection amount, each divided pilot injection amount is suppressed, and the penetration of fuel is suppressed to a low level so that attachment of fuel to a wall face is avoided, and also, fuel is caused to accumulate in the center portion of the cylinder.

Fuel injection control apparatus of internal combustion engine

The complexity of transformer design demands reliable and rigorous solution methods. Survey of current research reveals the continued interest in application of advanced techniques for transformer design optimization. This paper summarizes some of the most important developments in this research area. The main purpose is to provide a synthesis of the published research in this field and stimulate further research interests and efforts in the respective topics.

/pdf/the-state-of-the-art-in-engineering-methods-for-transformer-1xoan7apzu.pdf

The state of the art in engineering methods for transformer design and optimization: a survey

Described herein is a closed-loop electronic control system for controlling combustion in a diesel engine operating with highly premixed combustion, in which an injection system is designed to obtain at least two injections of fuel per engine cycle, the injections comprising at least one pilot injection and a subsequent main injection. The system is provided with sensors designed for measuring or calculating quantities characteristic of the process of fuel combustion, and a closed-loop control block, which provides a control of the modality of fuel injection based upon the measured or calculated value of the quantities by regulating at least one of the following parameters: the distance in time elapsing between the execution of the pilot injection and the main injection; and the amount of fuel injected by means of the pilot injection.

A closed-loop electronic control system for controlling combustion in a diesel engine operating with premixed combustion

IEEE Transactions on Dielectrics and Electrical Insulation

A method for determining the amount of pre-injection of an injection process of a self-igniting internal combustion engine, comprising pre-injection and main injection, consisting in determining the beginning of combustion of the main injection by evaluating an ionic current signal and determining the amount of pre-injection on the basis of a correlation between the beginning of combustion of the main injection and the amount of pre-injection.

Method and device for determining the amount of pre-injection

Syntactic foam is a composite material consisting of a polymer matrix and hollow microspheres. In this paper the influence of polymeric hollow microspheres on the mechanical properties of a silica particle filled epoxy resin is presented. The elasticity modulus is determined and a compact tensile test is used to evaluate the stress intensity factor and the energy release rate. The investigations are performed for a constant resulting filling degree of 40 vol.-%, whereas the ratio between the microspheres and the silica particles varies. Moreover the influence of different diameters of the microspheres on the mechanical properties is determined. All in all the presented investigations show a higher flexibility of the compositions with polymeric microspheres. Hence, the insulation material is able to withstand the mechanical stresses in consequence of thermal shocks.

Modification of the mechanical properties of epoxy resin with polymeric microspheres

The plug (1) has a center electrode (2), and mass electrodes (3a-3d) comprise a capacity with finite conductivity so that two successive ignition sparks lies at different mass electrodes. The mass electrodes are held at a predefined high electrical potential after the ignition spark. The mass electrodes are individually controlled after the ignition spark for discharge of the electrodes. A control device controls an ignition coil. A capacitor is switched against a mass between the mass electrodes and the plug. An independent claim is also included for a method for controlling ignition of a multi-spark plug.

Spark plug i.e. multi-spark plug, has mass electrodes comprising capacity with finite conductivity so that successive ignition sparks lies at different mass electrodes, and control device controlling ignition coil

Verfahren zur Bestimmung einer Voreinspritzmenge eines eine Voreinspritzung und eine Haupteinspritzung umfassenden Einspritzvorgangs einer selbstzundenden Brennkraftmaschine, mit einer Bestimmung des Verbrennungsbeginns der Haupteinspritzung mittels Auswertung eines Ionenstromsignals, und der Bestimmung der Voreinspritzmenge auf der Grundlage einer Korrelation zwischen dem Verbrennungsbeginn der Haupteinspritzung und der Voreinspritzmenge.

Michael Kesler

Papers

IEEE Transactions on Dielectrics and Electrical Insulation

Method and device for determining the amount of pre-injection

Modification of the mechanical properties of epoxy resin with polymeric microspheres

Spark plug i.e. multi-spark plug, has mass electrodes comprising capacity with finite conductivity so that successive ignition sparks lies at different mass electrodes, and control device controlling ignition coil

Verfahren und Vorrichtung zur Bestimmung einer Voreinspritzmenge