707 research outputs found
Arbitration and Dispute Settlement in Foreign Indirect Investment. The increasing significance and use of arbitration in international loan agreements, syndicated loans and international bond issues
No full textThis dissertation examines the suitability of arbitration for the resolution of securities regulatory claims and it adoption globally, which has resulted in international arbitration becoming the favoured dispute resolution mechanism in the securities industry. The author explains that disputes arising out of international bilateral and syndicated loan agreements are generally considered to be arbitrable, while international bond disputes are often derived from the controversies over the application of mandatory national laws and the compliance with securities regulation provisions - so the arbitrability of international bond disputes depends on the acceptance of the arbitrability of securities regulatory claims
A monolithically integrated power JFET and Junction Barrier Schottky diode in 4H silicon carbide
No full textEfficiency of power management circuits depends significantly on their constituent switches and rectifiers. The demands of technology are increasingly running up against the intrinsic properties of Si based power devices. 4H-Silicon Carbide (SiC) has superior properties that make it attractive for high power applications. SiC rectifiers are already a competitive choice and SiC switches have also been commercialized recently. Junction Barrier Schottky (JBS) diodes, which combine the advantages of PN and Schottky, have higher Figure of Merit (FOM) as rectifiers. Among switches, a robust and mature process has been developed for Silicon Carbide Vertical Junction Field Effect Transistors (VJFETs), which currently gives it the highest unipolar FOM. Switches are frequently combined with anti-parallel diodes in power circuits. This thesis describes the development of a SiC-based monolithically integrated power switch and diode. Monolithic integration increases reliability and efficiency, and reduces cost. Because of their superior properties and similarities in fabrication, we chose the SiC VJFET and JBS diode as the switch and rectifier. Detailed design, fabrication and characterization of the integrated switch to block above 800 V and conduct current beyond 100 A/cm2 is explained. In this process, the first physics-based 2-D compact model is developed for reverse leakage in a JBS diode as a function of design parameters. Since the gate-channel junctions of SiC VJFETs cannot be assumed to be abrupt, an existing analytical model for Si VJFETs is extended to account for graded gate-channel junctions. Using these analytical models, design rules are developed for the VJFET and JBS diode. Finite element simulations are used to find the best anode layout of the JBS diode and optimize electric field termination in the integrated device to ensure their capability to operate at high voltage. Finally, a spin-on glass based process is developed for filling the gate trenches of the VJFET to improve long-term robustness in extreme environments. The integrated power switch developed in this thesis points to the attractions of monolithic integration in SiC power circuits. Analytical compact design equations derived here will facilitate faster and easier design of switches and rectifiers for desired circuit operation.Ph. D.Includes bibliographical referencesIncludes vitaby Rahul Radhakrishna
The TTbar deformation and zeta functions in 3D gravity
No full textThis thesis explores two topics in three-dimensional gravity, the \ttb deformation and zeta functions of three-dimensional quotient manifolds.
The \ttb deformation is an irrelevant deformation of a two-dimensional translationally invariant quantum field theory which is well-behaved in the UV.
We consider the case of two-dimensional holographic Warped Conformal Field theories (WCFTs), which are dual to gravity in three-dimensional anti-de Sitter (AdS) spacetime with Compere, Song, Strominger (CSS) boundary conditions.
WCFTs are non-relativistic quantum field theories which have a Virasoro Kac-Moody symmetry algebra.
We compute the boundary conditions and asymptotic symmetry algebra for a \ttb deformed WCFT.
We find that the Kac-Moody algebra survives the deformation if one allows the boundary metric to transform appropriately under the asymptotic symmetries, however the Virasoro sector becomes highly deformed and is no longer chiral.
The Selberg zeta function is defined by the Euler product over prime geodesics on a hyperbolic quotient manifold.
It provides a simpler way to compute functional determinants of kinetic operators compared to traditional means.
We introduce a new construction of a zeta function, which generalizes the Selberg zeta function to non-hyperbolic quotient manifolds.
We employ our generalization to quotients of three-dimensional Warped AdS and three-dimensional flat spacetime.
We find that the zeroes of the zeta function accurately predicts the quasi-normal mode spectrum in these non-hyperbolic cases, providing evidence for the proposed construction of the zeta function.Ritgerð þessi fjallar um tvö viðfangsefni í þyngdarfræði í þrívíðu tímarúmi. Annars vegar
svonefnda TT¯-bjögun og hins vegar zetaföll fyrir þrívíð deildarúm.
TT¯-bjögun á tvívíðu skammtasviðslíkani með hliðrunarsamhverfu er víkjandi bjögun, í skilningi endurstöðlunar, sem leiðir ekki til ósamleitni á stuttum lengdarkvarða. Í fyrri hluta
rigerðarinnar er sjónum beint að TT¯-bjögun á undinni hornrækinni sviðsfræði, sem hefur
þyngdarfræðilega framsetningu í þrívíðu tímarúmi með neikvæðan heimsfasta. Undin hornrækin sviðsfræði hefur Virasoro×U(1) Kac-Moody samhverfualgebru. Kannað er hvaða
áhrif TT¯-bjögun slíkrar kenningar hefur á jaðarskilyrði og samhverfu í tilsvarandi þyngdarfræðilíkani. Helstu niðurstöður eru að U(1) samhverfan er óbreytt en Virasoroalgebran bjagast
og er ekki lengur hendin.
Selberg zetafall er skilgreint sem Eulermargfeldi yfir frumgagnvegi á breiðgerðu deildarúmi.
Með hjálp þess er mun auðveldara að reikna róf hreyfiorkuvirkja í skammtasviðlíkönum
heldur en með hefðbundnum aðferðum. Í seinni hluta ritgerðarinnar er kynnt til sögunnar nýtt
zetafall sem er alhæfing á Selberg zetafallinu fyrir fleiri deildarúm en þau sem eru breiðgerð.
Nýja zetafallið er ákvarðað annars vegar fyrir deildarúm af undnu þrívíðu tímarúmi með
neikvæðan heimsfasta og hins vegar fyrir deildarúm af flötu þrívíðu tímarúmi. Í báðum
tilvikum fæst samsvörun milli núllstöðva zetafallsins og tvinngilds eiginrófs á viðkomandi
deildarúmi, sem er í samræmi við eldri niðurstöður fyrir breiðgerð deildarúm.Icelandic Research Fund Grants No. 228952-053, 195970-053, University of Iceland doctoral grant
-Deformations of Holographic Warped CFTs
No full textWe explore deformations of Warped Conformal Field Theories
(WCFTs) in two dimensions as examples of deformed
non-relativistic quantum field theories. WCFTs are quantum field theories with
a VirasoroU(1) Kac-Moody symmetry. We compute the deformed symmetry
algebra of a deformed holographic WCFT, using the asymptotic
symmetries of AdS with deformed Comp\'ere, Song and
Strominger (CSS) boundary conditions. The U(1) Kac-Moody symmetry survives
provided one allows the boundary metric to transform under the asymptotic
symmetry. The Virasoro sector remains but is now deformed and no longer chiral.Comment: 15 pages, typos corrected, clarifications adde
On The Triviality Of -Modified Conformal Vector Fields
No full textWe prove that a compact Riemannian manifold does not admit any non-trivial -modified homothetic vector fields. In the corresponding case of an -modified conformal vector field , we establish an inequality that implies the triviality of . Further, we demonstrate that an affine Killing -modified conformal vector field on a non-compact Riemannian manifold must be trivial. Finally, we show that an -modified gradient conformal vector field is trivial under the assumptions of polynomial volume growth and convergence to zero at infinity
Chiral superconductivity from repulsive interactions in doped graphene
No full textAuthor Manuscript 17 Sep 2011Chiral superconductivity, which breaks time-reversal symmetry, can exhibit a wealth of fascinating properties that are highly sought after for nanoscience applications. We identify doped graphene monolayer as a system where chiral superconductivity can be realized. In this material, a unique situation arises at a doping where the Fermi surface is nested and the density of states is singular. In this regime, d-wave superconductivity can emerge from repulsive electron–electron interactions. Using a renormalization group method, we argue that superconductivity dominates over all competing orders for generic weak repulsive interactions. Superconductivity develops simultaneously in two degenerate d-wave pairing channels. We argue that the resulting superconducting state is of chiral type, with the phase of the superconducting order parameter winding by 4π around the Fermi surface. Realization of this state in doped graphene will prove that superconductivity can emerge from electron–electron repulsion, and will open the door to applications of chiral superconductivity
Telecommunications Industry with an emphasis on satellite technology
No full textabstract: For this Honors Thesis, I will present research on the history, current state, and future (10years) of Telecommunication focusing on the infrastructure. I will research and analyze the trend of technological development that is leading to telecommunication being more readily available in remote locations through new infrastructure due to satellite technology. This will include an analysis of the competitive landscape in the telecommunication and Satellite Technology Industry including an analysis of where opportunity lies in the future industry for new businesses to emerg
Adding diversity and realism to LAVA, a vulnerability addition system
No full textThesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 63-64).In this thesis, I designed and implemented several modifications to LAVA, a vulnerability addition system, with the goal of improving realism and diversity of the injected bugs. Specifically, I describe three separate improvements: a method to add fake bugs alongside real ones in order to decrease bug discoverability, two approaches to increase the complexity of the data flow of the inserted bugs, and a standalone program that uses equality saturation to diversify C-source codebases that can be added as a final stage to LAVA. Finally, I present two instances of bug-finding competitions-AutoCTF and Rode0day-that I helped design and run, which leveraged LAVA and the augmentations described in this thesis in order to accomplish their respective goals.by Rahul Sridhar.M. Eng
Delhi’s VAT Department- Mixed Results and Lessons for GST
No full textThe Value Added Tax (VAT) system is a system of indirect taxation that replaced the previous sales tax regime in India. Like its predecessor, VAT is implemented at the state level and applies to all goods traded within the state. The Delhi Value Added Tax Act was passed on 2004 and there were follow-up Rules in 2005. The new consumption tax system was finally put in force from 1 April 2005 in Delhi, along with 20 other states. Delhi VAT Act replaces the old Delhi Sales Tax Act, Delhi Sales Tax on Works Contract Act, Delhi Sales Tax on Right to use goods Act and Delhi Sales Tax on entry of motor vehicles. The Department of Trade and Taxes is the state department in charge of all matters related to VAT administration.VAT; GST; Delhi; India
Adaptive Intrusion Detection in Edge Computing using Cerebellar Model Articulation Controller and Spline Fit
No full textInternet-of-Thing (IoT) faces various security attacks. Different solutions exist to mitigate the intrusion problems. However, the existing solutions lack behind in dealing with heterogeneity of attack sources and features. The future anticipated demand of devices' connections also urge the need of new solutions addressing the concerns of time consumption and complexity. In this article, we show a novel solution for the intrusion detection in IoT framework. We configure the intrusion detection in the edge computing layer so that the effect of the attack is not propagated to the clouds. Our solution uses cerebellar model articulation controller with kernel map. This combination is very new in the direction of intrusion detection; hence, it emphasizes the novelty of our proposed intrusion detection solution. We name our solution as Cerebellar Model Articulation Controller based Intrusion Detection System (CMACIDS). Additionally, we use spline fitting to the kernel mapping for the model fit; this adds on another novel contribution to CMACIDS. The results obtained with our detection system are compared with the state-of-the-art solutions in terms of complexity, false alarms, and precision of detection. The analysis of the comparative study proves the efficiency of the solution and makes CMACIDS suitable for IoT paradigm. </p
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