Examining the Demographic Profiles of Thrift Store Donors and Thrift Store Shoppers

ABSTRACT Thrift Stores can be viewed as conversion mechanisms; that is, they accept merchandise from DONORS and then re-sell the merchandise to BUYERS. These are often separate and distinct groups. The challenge for Thrift Store operators is to separately appeal to each group as a place to donate and a place to shop for merchandise. This study profiles the donors and buyers for Thrift Stores so that store and organizational leadership can better develop marketing strategies to reach these distinct groups

Automorphism groups of countable algebraically closed graphs and endomorphisms of the random graph

We establish links between countable algebraically closed graphs and the endomorphisms of the countable universal graph $R$. As a consequence we show that, for any countable graph $\Gamma$, there are uncountably many maximal subgroups of the endomorphism monoid of $R$ isomorphic to the automorphism group of $\Gamma$. Further structural information about End $R$ is established including that Aut $\Gamma$ arises in uncountably many ways as a Sch\"{u}tzenberger group. Similar results are proved for the countable universal directed graph and the countable universal bipartite graph.Comment: Minor revision following referee's comments. 27 pages, 3 figure

Opportunities for Fostering Development of Academic Networks in Asia and the Pacific Through the FIG Asia Pacific Capacity Development Network

In many regions, higher education in surveying faces capacity challenges, and have limitations in access to information. It is well established that regional networks of higher education institutions are proven platforms for knowledge sharing and improved education experiences. In 2015 the FIG Council established the Regional Capacity Development Network to "Ensuring the Rapid Response to Change Ensuring the Surveyors of Tomorrow" by establishing a global network operationalised on a regional basis. The mission of the FIG Asia Pacific Capacity Development Network (AP CDN) is to enable an environment of land, marine and “space” professionals to effectively provide innovative, reliable and best practice solutions to address the regional, social, economic, environmental and technological challenges associated with global geospatial trends, our rapidly changing and complex world. This paper explores ppportunities for the FIG Asia Pacific Capacity Development Network to help support and foster further development of academic networks in the Asia and Pacific region

The 67 Hz Feature in the Black Hole Candidate GRS 1915+105 as a Possible ``Diskoseismic'' Mode

The Rossi X-ray Timing Explorer (RXTE) has made feasible for the first time the search for high-frequency (~ 100 Hz) periodic features in black hole candidate (BHC) systems. Such a feature, with a 67 Hz frequency, recently has been discovered in the BHC GRS 1915+105 (Morgan, Remillard, & Greiner). This feature is weak (rms variability ~0.3%-1.6%), stable in frequency (to within ~2 Hz) despite appreciable luminosity fluctuations, and narrow (quality factor Q ~ 20). Several of these properties are what one expects for a ``diskoseismic'' g-mode in an accretion disk about a 10.6 M_sun (nonrotating) - 36.3 M_sun (maximally rotating) black hole (if we are observing the fundamental mode frequency). We explore this possibility by considering the expected luminosity modulation, as well as possible excitation and growth mechanisms---including turbulent excitation, damping, and ``negative'' radiation damping. We conclude that a diskoseismic interpretation of the observations is viable.Comment: 4 Pages, Latex (emulateapj.sty included), to Appear in ApJ Letters, Vol. 477, Final Version with Updated Reference

A fast high-order method to calculate wakefield forces in an electron beam

In this paper we report on a high-order fast method to numerically calculate wakefield forces in an electron beam given a wake function model. This method is based on a Newton-Cotes quadrature rule for integral approximation and an FFT method for discrete summation that results in an $O(Nlog(N))$ computational cost, where $N$ is the number of grid points. Using the Simpson quadrature rule with an accuracy of $O(h^4)$, where $h$ is the grid size, we present numerical calculation of the wakefields from a resonator wake function model and from a one-dimensional coherent synchrotron radiation (CSR) wake model. Besides the fast speed and high numerical accuracy, the calculation using the direct line density instead of the first derivative of the line density avoids numerical filtering of the electron density function for computing the CSR wakefield force

Using Kernel-Based Statistical Distance to Study the Dynamics of Charged Particle Beams in Particle-Based Simulation Codes

Measures of discrepancy between probability distributions (statistical distance) are widely used in the fields of artificial intelligence and machine learning. We describe how certain measures of statistical distance can be implemented as numerical diagnostics for simulations involving charged-particle beams. Related measures of statistical dependence are also described. The resulting diagnostics provide sensitive measures of dynamical processes important for beams in nonlinear or high-intensity systems, which are otherwise difficult to characterize. The focus is on kernel-based methods such as Maximum Mean Discrepancy, which have a well-developed mathematical foundation and reasonable computational complexity. Several benchmark problems and examples involving intense beams are discussed. While the focus is on charged-particle beams, these methods may also be applied to other many-body systems such as plasmas or gravitational systems

Land Use Controls

The authors outline and analyze some of the more important developments in land use law having an impact upon Florida practice. The areas considered include: regulation by referendum, impact fees, intergovernmental zoning, federal jurisdiction of navigable waters, and the wide-spread use of mandatory platting

Switchgrass

Switchgrass (Panicum virgatum L.) is a tall, erect, warm-season perennial native to the tall grass prairie, oak savanna, and associated ecosystems of North America. It can be found in prairies, open woodlands, and brackish marshes east of the Rocky Mountains and generally south of 55° north latitude (Hitchcock 1951; Stubbendieck et al. 1991). Less than 1% of these ecosystems exist today, but these prairie and savanna remnants have served as in situ gene banks, preserving a vast amount of genetic diversity within switchgrass and many other plant species. Switchgrass has a diversity of uses as well, including pasture, hay production, biomass for energy production, soil and water conservation, carbon sequestration, and wildlife habitat