Functional Closure of Schwinger-Dyson Equations in Quantum Electrodynamics, Part 1: Generation of Connected and One-Particle Irreducible Feynman Diagrams

Using functional derivatives with respect to free propagators and interactions we derive a closed set of Schwinger-Dyson equations in quantum electrodynamics. Its conversion to graphical recursion relations allows us to systematically generate all connected and one-particle irreducible Feynman diagrams for the $n$-point functions and the vacuum energy together with their correct weights.Comment: Author Information under http://www.physik.fu-berlin.de/~kleinert/institution.html Latest update of paper also at http://www.physik.fu-berlin.de/~kleinert/32

Quantum Statistics of Hydrogen in Strong Magnetic Fields

By an extension of the Feynman-Kleinert variational approach, we calculate the temperature-dependent effective classical potential governing the quantum statistical properties of a hydrogen atom in a uniform magnetic field. In the zero-temperature limit, we obtain ground state energies which are accurate for all magnetic field strengths from weak to strong fields.Comment: Author Information under http://www.physik.fu-berlin.de/~kleinert/institution.html Latest update of paper also at http://www.physik.fu-berlin.de/~kleinert/30

Antigen-specific Ige Suppression Induced By Immunization With Dinitrophenyl-bordetella Pertussis Is Mediated Through Interferon-gamma

Immunization of mice with dinitrophenyl-Bordetella pertussis (DNP-BP) failed to induce anti-DNP IgE responses. Administration of DNP-BP induced however, the formation of anti-DNP IgE B memory cells, as demonstrated by adoptive transfer. Furthermore, mice pretreated with DNP-BP and primed with 2 {dollar}\mu{dollar}g DNP-OA in alum 2 weeks later produced high day 7 anti-DNP IgE levels. These subsided to near undetectable levels by day 12-14. The transient expression of serum IgE levels was accompanied by normal levels of anti-DNP IgG. The anti-OA response induced as a result of priming with DNP-OA in alum was not affected by pretreatment with DNP-BP. IgG subclass analysis revealed that mice pretreated with DNP-BP had elevated levels of IgG2a and reduced levels of IgG1 as compared to control (TNP-KLH-pretreated) mice. Treatment of mice with an anti-IFN-gamma monoclonal antibody, shortly after immunization with DNP-BP, not only reduced anti-DNP IgG2a levels, but prevented the sharp anti-DNP IgE decline that occurred after priming with DNP-OA in alum. These results suggest that DNP-BP-induced IFN-gamma production modulates immunoglobulin isotype expression in-vivo in an antigen-specific manner

Image reconstruction through polyfiltered variation minimization

There has been considerable interest in reconstruction of remotely sensed imagery from incomplete frequency measurements for some time now. Given the nature of the collection process, it may be that portions of the spectrum are either missing or corrupted such that one is left with an incomplete representation of the original image. The advances in both the theory and available software for sparse signal reconstruction through function minimization make it an attractive approach for recreating the missing frequency data. It is the aim of this thesis to generalize the reconstruction technique known as Total Variation (TV) minimization from a signal processing perspective and to show that it is but one instance of a more general class of multi-filter operators. The approach will be demonstrated using freely avail- able third-party software, and the reconstruction accuracy of TV minimization will be compared to that of several of the developed alternative operators. Last, the relationship between these operators and the frequencies to be reconstructed will be examined

Increasing Revenue and Cutting Costs: The Financial Aspect of Big Budget Football

The growth of college sports in recent years into a multi-billion dollar industry has significantly increased the financial obligations and incentive guidelines under which many universities operate. Nowhere has the drastic increase of incentive to be competitive been as prevalent as the sport of football. Under constant pressure and intense scrutiny from the National Collegiate Athletic Association (NCAA) and critics, schools must now find ways to decrease costs and increase revenues of their athletic programs, primarily through changes to the structure and business of the sport of football. Schools have attempted to reduce unnecessary costs, and at times, these reductions have had drastic impacts on other sports. Reductions of cost through the elimination of extravagant expenses, coaching salaries and realistic spending limitation will only limit this problem somewhat. Colleges and universities who continue to pursue the highest level of competition have found it necessary to increase revenue while decreasing expenditures. Many options have emerged as possible income sources, including student fees, increased marketing exposure through changes in conference affiliations and improved management of finances. Unless these practices become standardized, or schools find processes to supplement these measures, athletics will not be able to remain the integral element of college life as it is known today

The Evolution of the Far-UV Luminosity Function and Star Formation Rate Density of the Chandra Deep Field South from z=0.2-1.2 with Swift/UVOT

We use deep Swift UV/Optical Telescope (UVOT) near-ultraviolet (1600A to 4000A) imaging of the Chandra Deep Field South to measure the rest-frame far-UV (FUV; 1500A) luminosity function (LF) in four redshift bins between z=0.2 and 1.2. Our sample includes 730 galaxies with u < 24.1 mag. We use two methods to construct and fit the LFs: the traditional V_max method with bootstrap errors and a maximum likelihood estimator. We observe luminosity evolution such that M* fades by ~2 magnitudes from z~1 to z~0.3 implying that star formation activity was substantially higher at z~1 than today. We integrate our LFs to determine the FUV luminosity densities and star formation rate densities from z=0.2 to 1.2. We find evolution consistent with an increase proportional to (1+z)^1.9 out to z~1. Our luminosity densities and star formation rates are consistent with those found in the literature, but are, on average, a factor of ~2 higher than previous FUV measurements. In addition, we combine our UVOT data with the MUSYC survey to model the galaxies' ultraviolet-to-infrared spectral energy distributions and estimate the rest-frame FUV attenuation. We find that accounting for the attenuation increases the star formation rate densities by ~1 dex across all four redshift bins.Comment: 20 pages, 8 figures, 6 tables; accepted for publication in Ap

Synthetic approaches to the deoxyanthracyclines

During the last 10 years, adriamycin and daunomycin have been major components in the treatment of cancers. However, their toxicity has led to the search for less toxic anthracycline antibiotics. The 11-deoxyanthracyclines were discovered and have proven to be more effective anticancer drugs;A program was undertaken to develop a route to the linear tetracyclic ring system of the anthracyclines. This route was based on a sequential Diels-Alder/Friedel-Crafts strategy and has proven to be an effective approach for the expedient formation of anthracycline intermediates from a common starting material. These intermediates were successfully produced in 8 steps and possessed functionality for further elaboration to the deoxyanthracyclines;The sequential Diels-Alder/Friedel-Crafts strategy is also very versatile and should allow for the rapid formation of several novel anthracycline analogues

The asymmetric energy of single-closed-shell nuclei in present-day microscopic theory

M.S.R. Martin Ahren

swMATH - a new information service for mathematical software

An information service for mathematical software is presented. Publications and software are two closely connected facets of mathematical knowledge. This relation can be used to identify mathematical software and find relevant information about it. The approach and the state of the art of the information service are described here.Comment: see also: http://www.swmath.or