On the chiral effective meson-baryon Lagrangian at third order

We show that the recently constructed complete and ``minimal'' third order meson-baryon effective chiral Lagrangian can be further reduced from 84 to 78 independent operators.Comment: 6 pp, accepted for publication in Eur. Phys. J.

Introduction to the GiNaC Framework for Symbolic Computation within the C++ Programming Language

The traditional split-up into a low level language and a high level language in the design of computer algebra systems may become obsolete with the advent of more versatile computer languages. We describe GiNaC, a special-purpose system that deliberately denies the need for such a distinction. It is entirely written in C++ and the user can interact with it directly in that language. It was designed to provide efficient handling of multivariate polynomials, algebras and special functions that are needed for loop calculations in theoretical quantum field theory. It also bears some potential to become a more general purpose symbolic package

Analysis of the pion-kaon sigma-term and related topics

We calculate the one-loop contributions to the difference \Delta_{\pi K} between the isoscalar on-shell pion-kaon scattering amplitude at the Cheng-Dashen point and the scalar form factor \Gamma_K (2M_\pi^2) in the framework of three flavor chiral perturbation theory. These corrections turn out to be small. This is further sharpened by treating the kaons as heavy fields (two flavor chiral perturbation theory). We also analyze the two-loop corrections to the kaon scalar form factor based on a dispersive technique. We find that these corrections are smaller than in the comparable case of the scalar form factor of the pion. This is related to the weaker final state interactions in the pion-kaon channel.Comment: 25 pp, 3 fig

Water-tunnel and analytical investigation of the effect of strake design variables on strake vortex breakdown characteristics

A systematic water-tunnel study was made to determine the vortex breakdown characteristics of 43 strakes. The strakes were mounted on a 1/2-scale model of a Langley Research Center general research fighter fuselage model with a 44deg leading-edge-sweep trapezoidal wing. The analytically designed strake shapes provided examples of the effects of the primary design parameters (size, span, and slenderness) on vortex breakdown characteristics. These effects were analyzed in relation to the respective strake leading-edge suction distributions. Included were examples of the effects of detailed strake planform shaping. It was concluded that, consistent with the design criterion, those strakes with leading-edge suction distributions which increase more rapidly near, and have a higher value at, the spanwise tip of the strake produce a more stable vortex

Experimental and analytical study of the longitudinal aerodynamic characteristics of analytically and empirically designed Strake-wing configurations at subcritical speeds

Sixteen analytically and empirically designed strakes have been tested experimentally on a wing-body at three subcritical speeds in such a way as to isolate the strake-forebody loads from the wing-afterbody loads. Analytical estimates for these longitudinal results are made using the suction analogy and the augmented vortex lift concepts. The synergistic data are reasonably well estimated or bracketed by the high- and low-angle-of-attack vortex lift theories over the Mach number range and up to maximum lift or strake-vortex breakdown over the wing. Also, the strake geometry is very important in the maximum lift value generated and the lift efficiency of a given additional area. Increasing size and slenderness ratios are important is generating lift efficiently, but similar efficiency can also be achieved by designing a strake with approximately half the area of the largest gothic strake tested. These results correlate well with strake-vortex-breakdown observations in the water tunnel

Surgical Model of Menopause Symptoms: GABA’S Role in Anxiety and Hot Flashes

poster abstractMenopause is the permanent cessation of the primary functions of the human ovaries: the ripening and release of the ova, and the release of hormones that create the uterine lining. The transition from a reproductive to non-reproductive state is a result of a reduction in sex hormone production by the ovarian follicular cells due to their degeneration. For some women, the accompanying signs of and effects that can occur during the menopause transition years can significantly disrupt their daily activities and sense of well-being; symptoms include vasomotor instability (hot flashes and night sweats), anxiety, and sleep disruption. Unfortunately, animal modeling to understand these symptoms, particularly “hot flashes” has been limited and lacks predictive and construct validity. We have developed a novel model of “hot flashes” by injecting a 3 mg/kg (intraperitoneal administration) dose of the anxiogenic drug FG-7142 (a partial inverse agonist at the benzodiazepine site on the GABAA receptor) following bilateral ovariectomy. Previous work in our lab has determined that this injection elicits a rapid, 9° Celsius increase in tail skin temperature (the indicator of the “hot flash” response in a rat) in ovariectomized rats but not in sham-operated control rats. However, the neural sites that mediate this response are unknown. We hypothesized that there are significant differences in either the anatomical sites involved in the “hot flash” response in ovariectomized rats or the extent of activation of the same neural sites. To test this hypothesis, female rats were either bilaterally ovariectomized or sham-ovariectomized; following recovery, rats were given a 3 mg/kg dose of FG-7142 or vehicle and perfused 90 min later. Tissue was processed and stained for the immediate early gene product c-fos. It was determined that the ovariectomized rats had a hyperactive response in the hypothalamic brain region associated with anxiety and thermoregulation (i.e., dorsal medial hypothalamus)

Introduction to XLOOPS

The program package XLOOPS calculates massive one- and two-loop Feynman diagrams. It consists of five parts: i) a graphical user interface ii) routines for generating diagrams from particle input iii) procedures for calculating one-loop integrals both analytically and numerically iv) routines for massive two-loop integrals v) programs for numerical integration of two-loop diagrams. The package relies on the application of parallel space techniques. The treatment of tensor structure and the separation of UV and IR divergences in analytic expressions is described in this scheme. All analytic calculations are performed with MAPLE. Two-loop examples taken from Standard Model calculations are presented. The method has recently been extended to all two-loop vertex topologies, including the crossed topology, graphs with divergent subloops and IR divergent diagrams. This will be included in the XLOOPS package in the near future.Comment: 30 pages, LaTeX, uses epsfi

Neil Frink to James Meredith (Undated)

https://egrove.olemiss.edu/mercorr_pro/1745/thumbnail.jp