An exploration of women’s experiences of emotional ambivalence during their first trimester of pregnancy and their perceptions of psychosocial support during that time

The first trimester is a vital stage of pregnancy. Many important developmental changes take place for both mother and baby during this time. These changes are vast and fast paced and encompass changes to a woman’s body, their emotional and also their social wellbeing. This qualitative study aimed to gain insight into women’s experiences of emotional ambivalence and their perception of psychosocial support during the stage of the first trimester of pregnancy. Through Interpretative Phenomenological Analysis (IPA), super-ordinate themes and sub-ordinate themes were identified. Hearing first-hand accounts of four women’s lived experiences highlighted the prevalence of emotional ambivalence during the first trimester. It also exposed the reality and impact of perceived support that was deemed beneficial including support from significant relationships and support that was considered lacking including emotional holding and individually-led support. This study has added to the conversation that there is scope for further research with the view to addressing women’s mental and emotional wellbeing and the standard of perceived support they receive during the first trimester of pregnancy

Research requirements for development of advanced-technology helicopter transmissions

Helicopter drive-system technology which would result in the largest benefit in direct maintenance cost when applied to civil helicopters in the 1980 timeframe was developed. A prototype baseline drive system based on 1975 technology provided the basis for comparison against the proposed advanced technology in order to determine the potential for each area recommended for improvement. A specific design example of an advanced-technology main transmission is presented to define improvements for maintainability, weight, producibility, reliability, noise, vibration, and diagnostics. Projections of the technology achievable in the 1980 timeframe are presented. Based on this data, the technologies with the highest payoff (lowest direct maintenance cost) for civil-helicopter drive systems are identified

Kinematical analysis of the nutation speed reducer

This paper discusses the development of a Nutating Speed Reducer (NSR) which is characterized by high reduction ratio, high tooth contact ratio, very high torque to weight/volume ratio, quiet and smooth operation under load and very high efficiency. All of these advantages are due to the presence of conjugate face-gear pairs, which incorporate each other, which called nutating/rotating gear mechanism. Details of the NSR, its kinematics, gear tooth load capacity, and mesh efficiency are explained. The NSR component speeds and speed reduction ratios of the NSR are calculated. Effect of the varying nutation angles on the geometry of the NSR is discussed and compared

Thermodynamic studies of the two dimensional Falicov-Kimball model on a triangular lattice

Thermodynamic properties of the spinless Falicov-Kimball model are studied on a triangular lattice using numerical diagonalization technique with Monte-Carlo simulation algorithm. Discontinuous metal-insulator transition is observed at finite temperature. Unlike the case of square lattice, here we observe that the finite temperature effect is not able to smear out the discontinuous metal-insulator transition seen in the ground state. Calculation of specific heat (C_v) shows single and double peak structures for different values of parameters like on-site correlation strength (U), f-electron energy (E_f) and temperature.Comment: 6 pages, 7 figure