A Characterization of Connected (1,2)-Domination Graphs of Tournaments

Recently. Hedetniemi et aI. introduced (1,2)-domination in graphs, and the authors extended that concept to (1, 2)-domination graphs of digraphs. Given vertices x and y in a digraph D, x and y form a (1,2)-dominating pair if and only if for every other vertex z in D, z is one step away from x or y and at most two steps away from the other. The (1,2)-dominating graph of D, dom1,2 (D), is defined to be the graph G = (V, E ) , where V (G) = V (D), and xy is an edge of G whenever x and y form a (1,2)-dominating pair in D. In this paper, we characterize all connected graphs that can be (I, 2)-dominating graphs of tournaments

Erythema nodosum as a result of estrogen patch therapy for prostate cancer: a case report.

© 2015 Coyle et al.Introduction: Erythema nodosum is often associated with a distressing symptomatology, including painful subcutaneous nodules, polyarthropathy, and significant fatigue. Whilst it is a well-documented side-effect of estrogen therapy in females, we describe what we believe to be the first report in the literature of erythema nodosum as a result of estrogen therapy in a male. Case presentation: A 64-year-old Afro-Caribbean man with locally advanced carcinoma of the prostate agreed to participate in a randomized controlled trial comparing estrogen patches with luteinizing hormone-releasing hormone analogs to achieve androgen deprivation, and was allocated to the group receiving estrogen patches. One month later he presented with tender lesions on his shins and painful swelling of his ankles, wrists, and left shoulder. This was followed by progressive severe fatigue that required hospital admission, where he was diagnosed with erythema nodosum by a rheumatologist. Two months after discontinuing the estrogen patches the erythema nodosum, and associated symptoms, had fully resolved, and to date he remains well with no further recurrence. Conclusion: Trial results may establish transdermal estrogen as an alternative to luteinizing hormone-releasing hormone analogs in the management of prostate cancer, and has already been established as a therapy for male to female transsexuals. It is essential to record the toxicity profile of transdermal estrogen in men to ensure accurate safety information. This case report highlights a previously undocumented toxicity of estrogen therapy in men, of which oncologists, urologists, and endocrinologists need to be aware. Rheumatologists and dermatologists should add estrogen therapy to their differential diagnosis of men presenting with erythema nodosum

Resonances, radiation pressure and optical scattering phenomena of drops and bubbles

Acoustic levitation and the response of fluid spheres to spherical harmonic projections of the radiation pressure are described. Simplified discussions of the projections are given. A relationship between the tangential radiation stress and the Konstantinov effect is introduced and fundamental streaming patterns for drops are predicted. Experiments on the forced shape oscillation of drops are described and photographs of drop fission are displayed. Photographs of critical angle and glory scattering by bubbles and rainbow scattering by drops are displayed

The dynamic analysis of offshore mooring terminals

This Thesis investigates the methods which are currently avail- able for the dynamic analysis of Offshore Mooring Terminals, particular regard being paid to Single Point Mooring (SPM) Terminals. Various aspects of the problem are considered in turn, these being the random vibration of non-linear systems, the analysis of catenary mooring lines, buoy dynamics, ship motions, second order (or slow drift) forces and motions, and low frequency motions caused by instabilities. These various aspects are then applied to the dynamic analysis of a Single Buoy Storage (SBS) System and the effect of the method of analysis employed, the system dimensions and the environmental conditions on the computed response is investigated. A Time Domain investigation of the stability of the SBS System in the presence of wind and current alone reveals that the system is only unstable for combinations of wind and current which are unlikely to occur in practise. A static offset position is then assumed and the calculation of the three-dimensional first and second order response to random waves is performed in the Frequency Domain, linear wave theory being used. The first order wave forces are calculated by using strip theory for the tanker and Morison's equation for the buoy. The second order response in surge, sway and yaw is calculated by a reflection coefficient method, these coefficients being obtained from published literature. The non-linear mooring system and the drag forces acting on the buoy are linearised using the equivalent linearisation method, due account being taken of the coupling between the first and second order response. The model developed for the first order response of the system allows the use of a spreading function in the incident wave spectrum. The accuracy of linearisation techniques and the statistics of the second order force and response are also investigated

A Study of the Out-Of-Class Experiences of Saint Mary\u27s College Students Studying in Maynooth, Ireland

Problem Statement. The purpose of this study is to describe the out-of-class experiences of 21 students who studied in the Saint Mary\u27s College Ireland Program in Maynooth, Ireland, during the 1998-1999 academic year. It examines (1) how the program orientation influenced students\u27 desire to become involved in out-of-class activities, (2) how out-of-class experiences fostered students\u27 learning of the Irish culture, and (3) how the experiences influenced students\u27 attitudes toward cultures other than their own. Methodology. This study employed descriptive qualitative research. Focus groups were conducted to gather data used in developing questions for long interviews, and these long interviews were the focus of the study. Twenty-one of the 23 students who studied in Maynooth during the 1998-1999 academic year served as the population for the interviews. Results. Results of this study suggest that students used ethnographic discovery methods as they learned about the Irish culture. As demonstrated through Spradley\u27s means-end domain of semantic relationships, their roles as participant observers, interacting sojourners, and travelers afforded them opportunities to learn about the Irish culture. Contact with former participants in the Ireland Program appeared to be the greatest incentive for students to become involved in out-of-class activities. Students reported that living, studying, and developing relationships with members of the host culture were ways in which they learned about the culture, and that both directed and serendipitous travel provided valuable, but different, ways of learning about Irish culture. Students believed that out-of-class experiences had a part in reducing their tendency to stereotype people, and increased their interest in other cultures. Many expected their behavior to change in accordance with these attitude changes. Conclusions. Results suggest that (1) former Ireland Program students should be an integral part of orientation programs; (2) students should live and study with members of the host culture; (3) both directed and serendipitous travel should be built into a study-abroad program; and (4) re-entry programs should provide opportunities for implementation ofbehavioral changes

What’s wrong with us? A patchwork ethnography study of the lived experiences of the clients of a surplus food project in London

Investigating the lived experiences of visitors to a food surplus project in South West London

Effective constructions in plethysms and Weintraub's conjecture

We give a short proof of Weintraub's conjecture by constructing explicit highest weight vectors in the symmetric power of an even exterior power

Glory in optical backscattering from air bubbles

Observations of light backscattered from air bubbles in a viscous liquid demonstrate an enhancement due to axial focusing. A physical-optics approximation for the cross-polarized scattering correctly describes the spacing of regular features observed. The non-cross polarized scattering is not adequately described by a single class of rays