Memory Management Units (MMUs) are traditionally used by operating systems to implement disk-paged virtual memory. Some operating systems allow user programs to specify the protection level (inaccessible, readonly. read-write) of pages, and allow user programs t.o handle protection violations. bur. these mechanisms are not. always robust, efficient, or well-mat. ched to the needs of applications.

This work analyzes the advantages and disadvantages of using the novice programming environment Alice in the CS0 classroom. We consider both general aspects as well as specifics drawn from the authors ’ experiences using Alice in the classroom over the course of the last academic year.

OTA Background Papers are documents containing information that supplements formal OTA assessments or is an outcome of internal exploratory planning and evaluation. The material is usually not of immediate policy interest such as is contained in an OTA Report or Technical Memorandum, nor does it present options for Congress to consider.-I \lt. r,,,,.~ ’.-> ‘w,

The Bethe-Salpeter formalism is used to study two-body bound states within a scalar theory: two scalar fields interacting via the exchange of a third massless scalar field. The Schwinger-Dyson equation is derived using functional and diagrammatic techniques, and the Bethe-Salpeter equation is obtained in an analagous way, showing it to be a two-particle generalization of the Schwinger-Dyson equation. We also present a numerical method for solving the Bethe-Salpeter equation without three-dimensional reduction. The ground and first excited state masses and wavefunctions are computed within the ladder approximation and space-like form factors are calculated. The authors: Mike, Melissa, and Mike. pichowsk@theory.phy.anl.gov; Physics Division, Argonne National Laboratory, Argonne, IL 60439-4843 y mlk@curie.unh.edu; Physics Department, University of New Hampshire, Durham, NH 03824 z strickla@phy.duke.edu; Duke University, Durham, NC 1 Introduction Many of the bound systems that oc...

of the truth-table degrees are

As always in q-theory, (X; Q)n will stand for the product (1 − X)(1 − QX)...(1 − Q n−1 X), and when the ”base ” Q is q, we will abbreviate (X; q)n to (X)n. For any Laurent polynomial f in x1,..., xn, CT (f) denotes the coefficient of x 0 1..x 0 n. Throughout this paper t: = q a, s = q b, u = q c.

The changing function of the modern lab environment results in additional challenges requiring flexible task-specific solutions to minimize environmental impact, protect operator safety, and optimize

energy policies for sustainable development

Measurements on a multilayer two-dimensional electron system (2DES) near Landau level filling ν=1 reveal the disappearance of the nuclear spin contribution to the heat capacity as the ratio ˜g between the Zeeman and Coulomb energies exceeds a critical value ˜gc≈0.04. This disappearance suggests the vanishing of the Skyrmion-mediated coupling between the lattice and the nuclear spins as the spin excitations of the 2DES make a transition from Skyrmions to single spin-flips above ˜gc. Our experimental ˜gc is smaller than the calculated ˜gc=0.054 for an ideal 2DES; we discuss possible origins of this discrepancy. PACS numbers: 73.20.Dx, 73.40.Hm, 65.40.-f Typeset using REVTEX 1 The ground state and spin excitations of a two-dimensional electron system (2DES) near Landau level (LL) filling ν=1 have attracted much recent interest [1–9]. At this filling, the Coulomb exchange energy plays a dominant role, leading to a substantially larger quantum Hall effect (QHE) excitation gap than the expected single-particle Zeeman splitting [1].