Holographic Nambu Jona-Lasinio Interactions

NJL interactions are introduced into the D3/ probe D7 system using Witten's double trace operator prescription which includes the operator as a classical term in the effective potential. In the supersymmetric system they do not induce chiral symmetry breaking which we attribute to the flat effective potential with quark mass in the supersymmetric theory. If additional supersymmetry breaking is introduced then standard NJL behaviour is realized. In examples where chiral symmetry breaking is not preferred such as with a B field plus an IR cut off chiral condensation is triggered by the NJL interaction at a second order transition after a finite critical coupling. If the model already contains chiral symmetry breaking, for example in the B field case with no IR cut off, then the NJL interaction enhances the quark mass at all values of the NJL coupling. We also consider the system at finite temperature: the temperature discourages condensation but when combined with a magnetic field we find regions of parameter space where the NJL interaction triggers a first order chiral transition above a critical coupling.Comment: 7 pages, 6 figure

FACTORS AFFECTING EARNINGS OF SOUTHERN ILLINOIS UNIVERSITY AGRIBUSINESS ECONOMICS GRADUATES: THE NON-LAND-GRANT EXPERIENCE

Survey data were used to identify determinants of starting and current salaries of agribusiness economics graduates from Southern Illinois University Carbondale.Labor markets appear to be similar for graduates from land grant and non-land-grant universities. Respondents with the highest earnings were "native" men with advanced degree(s) who moved out of the southern Illinois region and were working in the private sector.Teaching/Communication/Extension/Profession,

E, B, \mu, T Phase Structure of the D3/D7 Holographic Dual

The large N_c N=4 gauge theory with quenched N=2 quark matter displays chiral symmetry breaking in the presence of a magnetic field. We previously studied the temperature and chemical potential phase structure of this theory in the grand canonical ensemble - here we, in addition, include the effect of an electric field which acts to counter chiral symmetry breaking by disassociating mesons. We compute using the gravity dual based on the D3/probe-D7 brane system. The theory displays two transition at one of which chiral symmetry is restored. At the other transition density switches on, the mesons of the theory become unstable and a current forms, making it a conductor-insulator transition. Through the temperature, electric field, chemical potential volume (at fixed magnetic field parallel to the electric field) these transitions can coincide or separate at critical points, and be first order or second order. We map out this full phase structure which provides varied computable examples relevant to strongly coupled gauge theories and potentially condensed matter systems.Comment: 20 pages, 7 figure

Technical development for Australia's MOBILESAT system

With the planned introduction in Australia of the mobile satellite service in mid-1992, MOBILESAT will be the first domestic mobile satellite system with full voice and data capability to be in operation worldwide. This paper describes the technical features which have been adopted by MOBILESAT in providing a unique system optimized for land mobile operation and the technical activities which have been carried out by AUSSAT in the past three years in supporting the development of the system

Fracture resistance of tie wings of ceramic brackets under loading

Objectives: To determine if there a significant difference in fracture strength of tie wings of 1. Polycrystalline ceramic brackets, 2. Monocrystalline ceramic brackets, made by different manufactures. Materials and Methods: Sample: The mesial incisal tie wing of 9 brands of commonly used polycrystalline and 5 brands of monocrystalline brackets were tested for fracture strength. Each brand’s sample consisted of 15 maxillary right central incisors brackets and 15 maxillary right lateral incisor brackets (.022 slot MBT). Method: The brackets were bonded onto a ceramic slab. An Instron Universal testing machine was used to apply a vertical force on the mesial incisal wing of each bracket. The force at the point of tie wing fracture was recorded as the fracture strength. Results: Polycrystalline brackets: Ormco Symmetri (301.03 N ± 36.56), 3M Clarity (203.55 N ± 36.56) and Forestadent Glam (196.06 N ± 68.84) were the strongest, with no significant difference between them. Dentsply Ovation C was the next strongest (175.87 N ± 48.25). Henry Schein NeoLucent Plus (119.74 N ± 21.06), Ortho Tech Ref Ceramic (107.53 N ± 51.07), TP Clear Vu (106.17 N ± 27.43), AO Cosmetic (88.52 ± 50.67) and RMO Signature III (84.99 ± 42.30) were the least strong, with no significant differences between them. Mono crystalline brackets: AO Radiance Plus (262.42 N ± 110.42), Ormco Inspire ICE (240.48 N ± 78.51) Henry Schein NeoCrystal Plus (221.80 N ± 42.07), Ortho Tech PURE (210.66 N ± 42.07) were the strongest, with no significant differences between them, while Dentsply Ovation S (55.80 N ± 13.04) was the weakest. Conclusions: There are significant differences in the fracture strength of various brands, both amongst polycrystalline and monocrystalline brackets

Holography of the Conformal Window

Inspired by the model of Jarvinen and Kiritsis, we present a simple holographic model for the on set of chiral symmetry breaking at the edge of the conformal window in QCD in the Veneziano limit. Our most naive model enforces the QCD two loop running coupling on a D3/D7 holographic brane system. The mass of the holographic field, describing the chiral condensate in the model, is driven below the BF bound when the running is sufficiently strong, triggering chiral symmetry breaking for N_f/N_c<2.9. This model though contains too great a remnant of supersymmetry and does not correctly encode the perturbative anomalous dimensions of QCD. In a second model we impose the QCD anomalous dimension result and find chiral symmetry breaking sets in for N_f/N_c=4 at a BKT-type phase transition. In this case the transition is triggered when the anomalous dimension of the mass operator \gamma_m=1.Comment: 10 pages, 2 figures, v2: minor corrections, improved Figure

Influential Article Review - Connectivity as Trade Determinant For Shipping Lines

This paper examines transportation. We present insights from a highly influential paper. Here are the highlights from this paper: Transport connectivity is a crucial determinant of bilateral exports. This paper presents an empirical assessment of the relationship between bilateral maritime liner shipping connectivity and exports in containerized goods during the period 2006–2013. Making use of probed “gravity” type trade models, the paper incorporates new data on different measurements of maritime distance, as well as a unique new dataset and new bilateral connectivity indices developed by UNCTAD. The empirical investigations unequivocally show that lacking a direct maritime connection with a trade partner is associated with lower values of exports; any additional transshipment is associated with a 40% lower value of bilateral exports. Other indicators of liner shipping connectivity incorporated in the research take into consideration levels of competition and container vessel sizes. Results also indicate that the quality of bilateral connectivity as measured by several composite indices is a crucial determinant of bilateral exports. All empirical results suggest that in the absence of a bilateral connectivity indicator the impact of distance on bilateral exports in classical gravity models is likely to be overestimated. For our overseas readers, we then present the insights from this paper in Spanish, French, Portuguese, and German

Non Mean-Field Quantum Critical Points from Holography

We construct a class of quantum critical points with non-mean-field critical exponents via holography. Our approach is phenomenological. Beginning with the D3/D5 system at nonzero density and magnetic field which has a chiral phase transition, we simulate the addition of a third control parameter. We then identify a line of quantum critical points in the phase diagram of this theory, provided that the simulated control parameter has dimension less than two. This line smoothly interpolates between a second-order transition with mean-field exponents at zero magnetic field to a holographic Berezinskii-Kosterlitz-Thouless transition at larger magnetic fields. The critical exponents of these transitions only depend upon the parameters of an emergent infrared theory. Moreover, the non-mean-field scaling is destroyed at any nonzero temperature. We discuss how generic these transitions are.Comment: 15 pages, 7 figures, v2: Added reference