Superconducting states of pure and doped graphene

We study the superconducting phases of the two-dimensional honeycomb lattice of graphene. We find two spin singlet pairing states, s-wave and an exotic $p+ip$ that is possible because of the special structure of the honeycomb lattice. At half filling, the $p+ip$ phase is gapless and superconductivity is a hidden order. We discuss the possibility of a superconducting state in metal coated graphene.Comment: 4 pages, 6 figure

Averaged initial Cartesian coordinates for long lifetime satellite studies

A set of initial Cartesian coordinates, which are free of ambiguities and resonance singularities, is developed to study satellite mission requirements and dispersions over long lifetimes. The method outlined herein possesses two distinct advantages over most other averaging procedures. First, the averaging is carried out numerically using Gaussian quadratures, thus avoiding tedious expansions and the resulting resonances for critical inclinations, etc. Secondly, by using the initial rectangular Cartesian coordinates, conventional, existing acceleration perturbation routines can be absorbed into the program without further modifications, thus making the method easily adaptable to the addition of new perturbation effects. The averaged nonlinear differential equations are integrated by means of a Runge Kutta method. A typical step size of several orbits permits rapid integration of long lifetime orbits in a short computing time

Optimal hybrid propulsion systems thrust trajectories in a patched-conic N-body force field

Euler-Lagrange equations for approximating optimal thrust trajectories for limited hybrid propulsion system in N-body dynamic environmen

Neutron stars: A cosmic hadron physics laboratory

A progress report is given on neutron stars as a cosmic hadron physics laboratory. Particular attention is paid to the crustal neutron superfluid, and to the information concerning its properties which may be deduced from observations of pulsar glitches and postglitch behavior. Current observational evidence concerning the softness or stiffness of the high density neutron matter equation of state is reviewed briefly, and the (revolutionary) implications of a confirmation of the existence of a 0.5 ms pulsar at the core of (Supernova) SN1987A are discussed

The Securities and Exchange Commission and Accounting Principles

In this thesis we address the problem of optimal code generation for irregular architectures such as Digital Signal Processors (DSPs). Code generation consists mainly of three interrelated optimization tasks: instruction selection (with resource allocation), instruction scheduling and register allocation. These tasks have been discovered to be NP-hard for most architectures and most situations. A common approach to code generation consists in solving each task separately, i.e. in a decoupled manner, which is easier from a software engineering point of view. Phase-decoupled compilers produce good code quality for regular architectures, but if applied to DSPs the resulting code is of significantly lower performance due to strong interdependences between the different tasks. We developed a novel method for fully integrated code generation at the basic block level, based on dynamic programming. It handles the most important tasks of code generation in a single optimization step and produces an optimal code sequence. Our dynamic programming algorithm is applicable to small, yet not trivial problem instances with up to 50 instructions per basic block if data locality is not an issue, and up to 20 instructions if we take data locality with optimal scheduling of data transfers on irregular processor architectures into account. For larger problem instances we have developed heuristic relaxations. In order to obtain a retargetable framework we developed a structured architecture specification language, xADML, which is based on XML. We implemented such a framework, called OPTIMIST that is parameterized by an xADML architecture specification. The thesis further provides an Integer Linear Programming formulation of fully integrated optimal code generation for VLIW architectures with a homogeneous register file. Where it terminates successfully, the ILP-based optimizer mostly works faster than the dynamic programming approach; on the other hand, it fails for several larger examples where dynamic programming still provides a solution. Hence, the two approaches complement each other. In particular, we show how the dynamic programming approach can be used to precondition the ILP formulation. As far as we know from the literature, this is for the first time that the main tasks of code generation are solved optimally in a single and fully integrated optimization step that additionally considers data placement in register sets and optimal scheduling of data transfers between different registers sets

Recipes for Success: Youth Council Guide to Creating a Youth Development System Under WIA

As we enter the new millennium, several trends exist that are radically changing the way our nation's young people will participate in the workforce. New technologies have opened up new industries and revolutionized our notion of the workplace. A booming economy has contributed to remarkably low unemployment rates. Today's young people can look forward to unprecedented opportunities, but only if they are prepared. Young people with little sense of direction, who do not obtain the knowledge and skills necessary to enter an increasingly complex workplace, will be left behind. The disparity between skilled and unskilled workers will become particularly dramatic in the next decade, when shifting demographics will increase/intensify competition for jobs.Those of us charged with helping young people reach their full potential must re-examine the way in which we prepare them for tomorrow's workplace. The Workforce Investment Act of 1998 provides an excellent opportunity to do just that. WIA authorizes over one billion dollars per year to help low income youth acquire the education, skill, work experience and support they will need to make the transition to productive adulthood.In creating the Youth Councils -- a mandated component of the Workforce Investment Boards -- WIA provides local communities with the framework for developing comprehensive and effective strategies that ensure such successful transitions. The partnerships represented on the Youth Council bring together a diverse set of stakeholders and resources, partners who can address the needs of young people more effectively that any one partner can do alone. Because the leadership provided bythe local Youth Councils will be pivotal in making this initiative work, it is essential that communities compose these Councils with great care.This guide is designed to provide practical information for community leaders, local Workforce Investment Boards (WIBs), Youth Councils, staff and others that are committed to effective youth and workforce development. It contains four sections and several appended exercises.Chapter 1: "Planning the Menu" defines youth development, outlines the basic concepts of making connections for young people (system-building), describes how WIA can make a difference and starts a work plan for Youth Councils.Chapter 2: "Youth Councils: Essential Ingredients" addresses the wide range of Youth Council responsibilities, from organization and staffing to strategic planning and accountability.Chapter 3: "Transition to WIA: From Soup To Nuts" addresses resource allocation decision making, follow-up services, the performance system, selecting service providers and other important administrative decisions.Chapter 4: "Coming Together At the Table" depicts the path ways to comprehensive service delivery based on proven princi ples and practices. The building blocks that are available as the platform for developing a system for young people are described.Youth Councils offer a leadership opportunity for local communities to bring about change in youth activities and outcomes. If communities take advantage of this opportunity, Youth Councils will be in a strong position to stimulate broad-based change, reward innovation, and improve performance in youth development and youth organizations. Communities will need assistance building effective Youth Councils. This guide will provide communities with the help they need to transform the potential of Youth Councils into measurable results, results that will make a profound difference in the lives of our nation's youth

Universal Behavior in Heavy Electron Materials

We present our finding that an especially simple scaling expression describes the formation of a new state of quantum matter, the Kondo Fermi liquid (KL) in heavy electron materials. Emerging at $T^*$ as a result of the collective coherent hybridization of localized f electrons and conduction electrons, the KL possesses a non-Landau density of states varying as $(1-T/T^*)^{3/2}[1+\ln(T^*/T)]$. We show that four independent experimental probes verify this scaling behavior and that for CeIrIn$_5$ the KL state density is in excellent agreement with the recent microscopic calculations of hybridization in this material by Shim, Haule, and Kotliar.Comment: 4 pages, 5 figure