Fluid dynamics video of domains with spiral dislocations formed in the wake of an enslaved phase-separation front

Enslaved phase-separation fronts that move with a speed just smaller than that of a free front will leave in their wake a morphology of alternating domains that are roughly aligned with the front. However, these alternating domains will typically not be in phase initially. Instead there are defects. Here we present novel phase-separation morphologies that are formed in such systems where the defects are reminiscent of spiral dislocations in crystal growth.Comment: 1 pag

Light Stop Searches at the LHC in Events with One Hard Photon or Jet and Missing Energy

Low energy supersymmetric models provide a solution to the hierarchy problem and also have the necessary ingredients to solve two of the most outstanding issues in cosmology: the origin of the baryon asymmetry and the source of dark matter. In the MSSM, weak scale generation of the baryon asymmetry may be achieved in the presence of light stops, with masses lower than about 130 GeV. Moreover, the proper dark matter density may be obtained in the stop-neutralino co-annihilation region, where the stop-neutralino mass difference is smaller than a few tens of GeV. Searches for scalar top quarks (stops) in pair production processes at the Tevatron and at the Large Hadron Collider (LHC) become very challenging in this region of parameters. At the LHC, however, light stops proceeding from the decay of gluino pairs may be identified, provided the gluino mass is smaller than about 900 GeV. In this article we propose an alternative method for stop searches in the co-annihilation region, based on the search for these particles in events with missing energy plus one hard photon or jet. We show that this method is quite efficient and, when complemented with ongoing Tevatron searches, allows to probe stop masses up to about 160 GeV, fully probing the region of parameters consistent with electroweak baryogenesis in the MSSM.Comment: 17 pages, 6 figure

The Enlightenment of Administrative Law: Looking Inside the Agency for Legitimacy

This article’s investigation into the “agency for legitimacy” proceeds in five steps: Part I introduces the concept of “administrative constitutionalism,” which encompasses the debate over what should be the role and nature of public administration to ensure its legitimacy. It then lays out the elements of the rational-instrumental and deliberative-constitutive paradigms and explains how they contribute to administrative constitutionalism respectively from the outside-in and inside-out. Part II provides a brief history of administrative constitutionalism, which reveals there have been ongoing tensions between two paradigms—and thus between outside in and inside out accountability—since the 1880s. Part III elaborates on the authors’ argument that the current emphasis on the rational-instrumental model has been administrative constitutionalism unsustainable. Part IV argues that acknowledging and developing the deliberative-constitutive paradigm will strengthen administrative constitutionalism by admitting the existence of agency discretion and by looking for realistic ways to make it accountable. Finally, Part V offers a case study in how the deliberative-constitutive paradigm can contribute to administrative constitutionalism.The Kay Bailey Hutchison Center for Energy, Law, and Busines

Inverter ratio failure detector

A failure detector which detects the failure of a dc to ac inverter is disclosed. The inverter under failureless conditions is characterized by a known linear relationship of its input and output voltages and by a known linear relationship of its input and output currents. The detector includes circuitry which is responsive to the detector's input and output voltages and which provides a failure-indicating signal only when the monitored output voltage is less by a selected factor, than the expected output voltage for the monitored input voltage, based on the known voltages' relationship. Similarly, the detector includes circuitry which is responsive to the input and output currents and provides a failure-indicating signal only when the input current exceeds by a selected factor the expected input current for the monitored output current based on the known currents' relationship

Phase ordering of two-dimensional symmetric binary fluids: a droplet scaling state

The late-stage phase ordering, in $d=2$ dimensions, of symmetric fluid mixtures violates dynamical scaling. We show however that, even at 50/50 volume fractions, if an asymmetric droplet morphology is initially present then this sustains itself, throughout the viscous hydrodynamic regime, by a `coalescence-induced coalescence' mechanism. Scaling is recovered (with length scale $l \sim t$, as in $d=3$). The crossover to the inertial hydrodynamic regime is delayed even longer than in $d=3$; on entering it, full symmetry is finally restored and we find $l\sim t^{2/3}$, regardless of the initial state.Comment: 4 pages, three figures include