Breastfeeding after Gestational Diabetes: Does Perceived Benefits Mediate the Relationship?

Introduction. Breastfeeding is recognized as one of the best ways to decrease infant mortality and morbidity. However, women with gestational diabetes mellitus (GDM) may have breastfeeding barriers due to the increased risk of neonatal and pregnancy complications. While the prevalence of GDM is increasing worldwide, it is important to understand the full implications of GDM on breastfeeding outcomes.The current study aims to investigate the (1) direct effect of GDM on breastfeeding duration and (2) indirect effect of GDM on breastfeeding duration through perceived benefits of breastfeeding. Methods. Prospective cohort data from the Infant Feeding and Practices Study II was analyzed (=4,902). Structural equation modeling estimated direct and indirect effects. Results. Perceived benefits of breastfeeding directly influenced breastfeeding duration ( = 0.392, ≤ 0.001). GDM was not directly associated with breastfeeding duration or perceived benefits of breastfeeding. Similarly, GDM did not have an indirect effect on breastfeeding duration through perceived benefits of breastfeeding. Conclusions. Perceived benefits of breastfeeding are an important factor associated with breastfeeding duration. Maternal and child health care professionals should enhance breastfeeding education efforts

New evidence of short-run underpricing in Australian IPOs

The short-run market performance of initial public offerings (IPOs) indicates that the prices are often underpriced. This is widely accepted as a universal phenomenon. To find out whether Australian IPOs are underpriced, this paper analyzes the short-run market performance of 254 IPOs by industry, listing year and issue year. To measure the performance, the first-day returns are divided into the opening price primary market and the closing price secondary market, and the post-listing returns are also examined. The study found that, overall, Australian IPOs were underpriced by 25.47% based on abnormal returns and 26.43% on raw returns on the first-day primary market, which was statistically significant at the 1% level. However, analysis of the secondary market indicates that the Australian IPOs were overpriced by 1.55% and 1.54% on abnormal and raw returns, respectively, which was statistically significant at the 5% level. The examination of post-listing returns shows that Australian IPOs were underpriced based on cumulative abnormal returns (CARs) on the 3rd, 6th, and 10thdays by 24.63%, 24.06%, and 23.34%, respectively. The primary and post-listing analysis shows that IPOs in the industrial sector are more attractive to investors, whereas those in the chemical and materials sector are less attractive compared to other sectors. As far as the investors’ wealth is concerned, the study concludes that the short-run market performance analysis should consider both the first-day and post-listing return

Free vibration of a three-layered sandwich beam using the dynamic stiffness method and experiment

In this paper, an accurate dynamic stiffness model for a three-layered sandwich beam of unequal thicknesses is developed and subsequently used to investigate its free vibration characteristics. Each layer of the beam is idealised by the Timoshenko beam theory and the combined system is reduced to a tenth-order system using symbolic computation. An exact dynamic stiffness matrix is then developed by relating amplitudes of harmonically varying loads to those of the responses. The resulting dynamic stiffness matrix is used with particular reference to the Wittrick-Williams algorithm to carry out the free vibration analysis of a few illustrative examples. The accuracy of the theory is confirmed both by published literature and by experiment. The paper closes with some concluding remarks. (c) 2007 Elsevier Ltd. All rights reserved

Mass fatality management following the South Asian tsunami disaster: case studies in Thailand, Indonesia, and Sri Lanka.

BACKGROUND: Following natural disasters, mismanagement of the dead has consequences for the psychological well-being of survivors. However, no technical guidelines currently exist for managing mass fatalities following large natural disasters. Existing methods of mass fatality management are not directly transferable as they are designed for transport accidents and acts of terrorism. Furthermore, no information is currently available about post-disaster management of the dead following previous large natural disasters. METHODS AND FINDINGS: After the tsunami disaster on 26 December 2004, we conducted three descriptive case studies to systematically document how the dead were managed in Thailand, Indonesia, and Sri Lanka. We considered the following parameters: body recovery and storage, identification, disposal of human remains, and health risks from dead bodies. We used participant observations as members of post-tsunami response teams, conducted semi-structured interviews with key informants, and collected information from published and unpublished documents. Refrigeration for preserving human remains was not available soon enough after the disaster, necessitating the use of other methods such as dry ice or temporary burial. No country had sufficient forensic capacity to identify thousands of victims. Rapid decomposition made visual identification almost impossible after 24-48 h. In Thailand, most forensic identification was made using dental and fingerprint data. Few victims were identified from DNA. Lack of national or local mass fatality plans further limited the quality and timeliness of response, a problem which was exacerbated by the absence of practical field guidelines or an international agency providing technical support. CONCLUSIONS: Emergency response should not add to the distress of affected communities by inappropriately disposing of the victims. The rights of survivors to see their dead treated with dignity and respect requires practical guidelines and technical support. Mass fatality management following natural disasters needs to be informed by further field research and supported by a network of regional and international forensic institutes and agencies

MECHANICS OF A PARALLEL-PLATE ELECTROSTATIC ACTUATOR IN VISCOUS DIELECTRIC MEDIA

International audienceThis work details the analysis of a parallel-plate actuator in viscous dielectric media for biological applications such as probing and sorting cells. The actuator achieves intended displacement (5 µm) at low actuation voltages (0-18 V) in viscous dielectric media, namely water, methanol, and air

Dynamics of a parallel-plate electrostatic actuator in viscous dielectric media

International audienceUnderstanding the dynamics of a parallel plate electrostatic actuator in viscous dielectric media will help optimize the actuator performance for manipulating microparticles suspended in aqueous media. In this paper, we analyze the response of the actuator in a clamped-clamped configuration immersed in viscous dielectric media. We modeled the actuator as a continuous system by deriving a reduced-order model, and solving it by employing the Galerkin method and linear undamped mode shapes for a clamped-clamped beam. Our model incorporates the inertial loading effect and squeeze film damping by the media, nonlinear mid-plane stretching forces in the beam electrode of the actuator, and nonlinear contact force during the physical contact of the beam electrode with the stationary electrode. The model is utilized to study the actuator dynamics over a broad range, three orders of magnitude of viscosity and two orders of magnitude of relative permittivity of the media. We report that the actuator at lower actuation voltages and/or higher actuation frequencies can be approximated to be a linear system. We also report that at very high actuation frequencies, the beam electrode does not pull-in into the stationary electrode, and the actuator experiences a significant phase lag and displacement drift over time