Rho meson broadening in hot and dense hadronic matter

The modification of the width of rho mesons due to in-medium decays and collisions is evaluated. The decay width is calculated from the imaginary part of the one-loop selfenergy at finite temperature. The collision width is related to the cross sections of the rho + pion and the rho + nucleon reactions. A calculation based on an e ective Lagrangian shows the importance of including the direct pho pi - > pho pi scattering which is dominated by the a1 exchange. A large broadening of the spectral function is found, accompanied by a strength suppression at the pole. http://www.arxiv.org/abs/nucl-th/981205

Effects of external fields on two-dimensional Klein-Gordon particle under pseudoharmonic oscillator interaction

We study the effects of the perpendicular magnetic and Aharonov-Bohm (AB) flux fields on the energy levels of a two-dimensional (2D) Klein-Gordon (KG) particle subjects to equal scalar and vector pseudo-harmonic oscillator (PHO). We calculate the exact energy eigenvalues and normalized wave functions in terms of chemical potential parameter, magnetic field strength, AB flux field and magnetic quantum number by means of the Nikiforov-Uvarov (NU) method. The non-relativistic limit, PHO and harmonic oscillator solutions in the existence and absence of external fields are also obtained.Comment: 13 pages, to appear in Chinese Physics B (2012). arXiv admin note: text overlap with arXiv:hep-th/050320

Periodic Abstinence: Definition, Motivation and Research

One of the Jesuit priests playing an organ. (11 January 1955) [Photo by Boleslaus Lukaszewski, Original number PHO 1.176a.26

Widely tunable silicon-on-insulator ring resonators with a liquid crystal cladding

Silicon-On-Insulator ring resonators can be widely tuned with a cladding layer of Liquid Crystals. Reorientation of the director with an electric field results in a tuning range of more than 30nm

Light collection from scattering media in a silicon photonics integrated circuit

We present a silicon photonics integrated circuit to efficiently couple scattered light into a single mode waveguide. By modulating the phase of N light-capturing elements, the collection efficiency can be increased by a factor N

[Book Review of] \u3cem\u3eMedicine and Religion: Strategies of Care,\u3c/em\u3e edited by Donald W. Shriver, Jr.

An early morning view west on Lindell Boulevard, with Davis-Shaughnessy Hall on the left. The street has been prepared for the return motorcade of Pope John Paul II. (27 January 1999) [Photo by Randy R. McGuire, Assistant SLU Archivist. Original photo identification number is PHO 3.355.3

Longitudinal study on the influence of Nd:YAG laser irradiation on microleakage associated of two filling techniques.

Objective: This study investigates the effects of Nd:YAG laser irradiation on apical and coronal seals, when used prior to two root canal filling techniques. Background Data: Limited information exists regarding the effects of morphologic changes to dentin walls following Nd: YAG laser irradiation on the sealing ability of root fillings. Methods: Two hundred forty teeth were analyzed by observing coronal and apical leakage of Indian ink (DL), and 60 were analyzed for through-and-through leakage using the fluid transport model (FTM). The Nd: YAG laser parameters were 1.5W, 100mJ, and 15Hz (four times for 5s at 20s intervals). Each group consisted of a lased and a nonlased subgroup: each subgroup had root fills done by either cold lateral condensation (CLC) or hybrid condensation (HC). Leakage was assessed after 48 h, and then at 1, 6, and 12 months. The DL group was divided into four groups of 15 teeth for each evaluation point. Through-and-through leakage (L in microliters/day) was measured for 48h under a pressure of 1.2 atm using FTM, and recorded as L = 0 (L1), 0 10 (L3). Results: Apical and coronal dye leakage was observed in all groups. Significant differences (p < 0.05) in apical leakage were found between HC and HC + Nd after 1, 6, and 12 months, and between CLC and CLC + Nd at 6 and 12 months. No significant differences were found between laser-irradiated and non-laser-irradiated groups with FTM. Conclusion: Pulsed Nd: YAG laser irradiation following root canal preparation may reduce apical leakage in association with hybrid gutta-percha condensation