Determining Genus From Sandpile Torsor Algorithms

We provide a pair of ribbon graphs that have the same rotor routing and Bernardi sandpile torsors, but different topological genus. This resolves a question posed by M. Chan [Cha]. We also show that if we are given a graph, but not its ribbon structure, along with the rotor routing sandpile torsors, we are able to determine the ribbon graph's genus.Comment: Extended Abstract Accepted to FPSAC 2018. Revision of previous versio

A survey of NASTRAN improvements since level 15.5

Several improvements and capabilities were developed and installed in intermediate levels and are being analyzed and evaluated. A survey of current improvements to the program is presented which includes static analysis with differential stiffness rigid format, normal modes with differential stiffness rigid format, the TRIAAX and TRAPAX elements, the CNGRNT feature, fully stressed design, element strain energy and grid point force balance, and complex modal displacement plots

Data management for earth observations

The management of NASA earth observation data is discussed. User requirements are identified, as well as means to facilitate data acquisition. It is shown that LANDSAT data can be preprocessed to condense data into a more accessible format, thus reducing data acquisition costs

LSA And State Library Agencies

To know where our state libraries are going, it is important first to know where they have been and where they are now. Without going into this exhaustively, let me develop with you for a few moments some of the things that have happened to us in the five years since the Library Services Act became the law of the land. I think we are all aware of the fact that the r improvement in our state library agencies is one of the principal accomplishments of the Library Services Act. The publication, State Plans under the Library Services Act. Supplement 2, A makes this quite clear. State after state reported strengthened state library agencies in all parts of the country. Idaho, for example, employed its first trained administrator and three more professional librarians in the state agency. Kansas and Mississippi added professional librarians and clerical assistants. It was not just the small state agencies that did this, however; even the New York State Library built on its existing strength by adding specialists in Young Adult, Reference, and Children's Services. In all, more than 115 field workers or consultants were added to state agency staffs, an increase of more than 100 per cent over the total field staffs in existence in 1956. In addition, 285 other professional librarians were added.published or submitted for publicatio

Primordial Circular Polarization in the Cosmic Microwave Background

Circular ("V-mode") polarization is expected to be vanishing in the CMB, since it is not produced in Thomson scattering. However, considering that the conventional CMB anisotropies are generated via an early universe mechanism such as inflation or a bouncing scenario, it is possible that circular polarization could be primordially produced and survive to the surface of last scattering. We study this in detail, and find a large class of inflationary models that produce a nearly scale invariant spectrum of scalar V-mode anisotropies. We study the inflationary production and subsequent evolution via the Boltzmann hierarchy, and show that V-mode polarization present in the CMB is suppressed by a factor of at least $10^{10^{20}}$ relative to the primordial $V$, consistent with expectation of negligible V-mode polarization from inflation. We consider alternative possibilities for sourcing $V$ primordially, such as the V-mode polarization induced by circularly polarized primordial gravitational waves, or producing $V$ after inflation, via new interactions at recombination.Comment: 8 pages, 1 figure. v2: references added. v3:matches published version. v4:typo correcte

A National Summit on Women Veteran Homelessness: A Leadership Dialogue

The National Summit on Women Veteran Homelessness brought together noted researchers, policy and practice experts, and women veterans with the lived experience of homelessness in a day and a half of facilitated dialogue sessions. Our purpose was threefold. First, we wanted to call attention to the growing national problem of homelessness among women veterans. Second, we wanted to better understand the unique challenges facing women veterans who have lost their homes or are at risk of homelessness. Finally, we sought to gather information and ideas for solutions to prevent and end homelessness among women veterans. Rich information was obtained from these sessions that will help us to understand the complex conditions that can result in women veteran homelessness, isolate the key areas where action to remediate the issues is required and create comprehensive and sustainable solutions that reduce the risk of women veteran homelessness and help those who are already homeless to achieve full reintegration into their communities. This report begins with a summary of presentations delivered by three experts who provided background on the demographics of homeless veterans, key programs at the U.S. Department of Veterans Affairs (VA), a research perspective on the challenges homeless women veterans face and litigation and advocacy as tools for change. The core of the report, called the Summit Dialogue Sessions, summarizes three roundtable discussions centered on the following themes: 1) pathways to homelessness for women veterans; 2) strategies for exiting homelessness; and 3) approaches to preventing women veterans from falling into homelessness. The report then turns attention to the list of actionable tasks which grew out of the roundtables, as well as two facilitated "fishbowls" in which subgroups of Summit participants explored specific issues related to policy, practice and research. Together, these offer not only a record of the work accomplished at the Summit, but also a pathway to future research, policy and program initiatives that hold the hope and potential for preventing and ending women veteran homelessness

Issues in corporate governance

On September 29, 2002, William J. McDonough, President of the Federal Reserve Bank of New York, delivered the William Taylor Memorial Lecture in Washington, D.C., at an event cosponsored by the William Taylor Memorial Fund and the Group of Thirty, a private, international consultative group on economic and monetary affairs. In his lecture, Mr. McDonough describes the actions already taken by private and public sector groups to strengthen corporate governance and accounting standards and identifies areas where reforms are still needed.Corporations - Finance ; Accounting ; Risk management ; Executives - Salaries