Incidents in the Life of a Slave Girl, Education and Abolition

Some thirty years before Harriet Ann Jacobs opened the Jacobs Free School in Alexandria, Virginia in January 1864, one of her first students was her fifty-threeyear-old uncle, Fred. The seventeen-year-old Harriet appreciated her uncle\u27s most earnest desire to learn to read and promised to teach him.1 As slaves, both teacher and student risked the punishment of thirtynine lashes on [the] bare back as well as imprisonment for violating North Carolina\u27s anti-literacy laws targeting African Americans.2 Nevertheless they agreed to meet three times a week in a quiet nook where she instructed him in secret.3 While the primary goal for him was to read the Bible, this moment in Jacobs\u27 slave narrative Incidents in the Life of a Slave Girl revealed her early commitment to African American literacy and education as well as her rejection of the laws of American slavery. In that moment, the vocations of education and abolition took root for Harriet Jacobs

Spring Season Survey of the Urban Blowflies (Diptera: Calliphoridae) of Chicago, Illinois

During May 1980, 1165 blowflies of 12 species were trapped on chemically enhanced rat carrion baits in a dense urban setting in Chicago. In descending order, Cynomyopsis cadaverina, Lucilia sericata, and Phormia regina were the most abundant species recovered (92% of total). These results are contrasted with other nearby blowfly surveys

Atoms with bosonic "electrons" in strong magnetic fields

We study the ground state properties of an atom with nuclear charge $Z$ and $N$ bosonic ``electrons'' in the presence of a homogeneous magnetic field $B$. We investigate the mean field limit $N\to\infty$ with $N/Z$ fixed, and identify three different asymptotic regions, according to $B\ll Z^2$, $B\sim Z^2$, and $B\gg Z^2$. In Region 1 standard Hartree theory is applicable. Region 3 is described by a one-dimensional functional, which is identical to the so-called Hyper-Strong functional introduced by Lieb, Solovej and Yngvason for atoms with fermionic electrons in the region $B\gg Z^3$; i.e., for very strong magnetic fields the ground state properties of atoms are independent of statistics. For Region 2 we introduce a general {\it magnetic Hartree functional}, which is studied in detail. It is shown that in the special case of an atom it can be restricted to the subspace of zero angular momentum parallel to the magnetic field, which simplifies the theory considerably. The functional reproduces the energy and the one-particle reduced density matrix for the full $N$-particle ground state to leading order in $N$, and it implies the description of the other regions as limiting cases.Comment: LaTeX2e, 37 page

Automatic Wrapper Adaptation by Tree Edit Distance Matching

Information distributed through the Web keeps growing faster day by day,\ud and for this reason, several techniques for extracting Web data have been suggested\ud during last years. Often, extraction tasks are performed through so called wrappers,\ud procedures extracting information from Web pages, e.g. implementing logic-based\ud techniques. Many fields of application today require a strong degree of robustness\ud of wrappers, in order not to compromise assets of information or reliability of data\ud extracted.\ud Unfortunately, wrappers may fail in the task of extracting data from a Web page, if\ud its structure changes, sometimes even slightly, thus requiring the exploiting of new\ud techniques to be automatically held so as to adapt the wrapper to the new structure\ud of the page, in case of failure. In this work we present a novel approach of automatic wrapper adaptation based on the measurement of similarity of trees through\ud improved tree edit distance matching techniques