Study to define low voltage and low temperature operating limits of the Pioneer 10/11 Meteoroid Detection Equipment (MDE) system

The Pioneer 10/11 meteoroid detection equipment (MDE) pressure cells were tested at liquid nitrogen (LN2) and liquid helium (LHe) temperatures with the excitation voltage controlled as a parameter. The cells failed by firing because of pressurizing gas condensation as the temperature was lowered from LN2 to LHe temperature and when raised from LHe temperature. A study was conducted to determine cell pressure as a function of temperature, and cell failure was estimated as a function of temperature and excitation voltage. The electronic system was also studied, and a profile of primary spacecraft voltage (nominally 28 Vdc) and temperature corresponding to electronic system failure was determined experimentally

A feasibility study of a miniature solid-state pressure transducer

Potential electrical response of p-n junction to mechanical strai

Development of reliability methodology for systems engineering. Volume II - Application - Design reliability analysis of a 250 volt-ampere static inverter Final report

Design stage reliability analysis application to static inverte

Study of fluid transients in closed conduits progress report no. 64-5, 1-30 nov. 1964

Fluid transients in closed conduit

Model checking probabilistic and stochastic extensions of the pi-calculus

We present an implementation of model checking for probabilistic and stochastic extensions of the pi-calculus, a process algebra which supports modelling of concurrency and mobility. Formal verification techniques for such extensions have clear applications in several domains, including mobile ad-hoc network protocols, probabilistic security protocols and biological pathways. Despite this, no implementation of automated verification exists. Building upon the pi-calculus model checker MMC, we first show an automated procedure for constructing the underlying semantic model of a probabilistic or stochastic pi-calculus process. This can then be verified using existing probabilistic model checkers such as PRISM. Secondly, we demonstrate how for processes of a specific structure a more efficient, compositional approach is applicable, which uses our extension of MMC on each parallel component of the system and then translates the results into a high-level modular description for the PRISM tool. The feasibility of our techniques is demonstrated through a number of case studies from the pi-calculus literature

Barriers and facilitators to GP-patient communication about emotional concerns in UK primary care: a systematic review.

Background In the UK, general practitioners (GPs) are the most commonly used providers of care for emotional concerns. Objective To update and synthesize literature on barriers and facilitators to GP–patient communication about emotional concerns in UK primary care. Design Systematic review and qualitative synthesis. Method We conducted a systematic search on MEDLINE (OvidSP), PsycInfo and EMBASE, supplemented by citation chasing. Eligible papers focused on how GPs and adult patients in the UK communicated about emotional concerns. Results were synthesized using thematic analysis. Results Across 30 studies involving 342 GPs and 720 patients, four themes relating to barriers were: (i) emotional concerns are difficult to disclose; (ii) tension between understanding emotional concerns as a medical condition or arising from social stressors; (iii) unspoken assumptions about agency resulting in too little or too much involvement in decisions and (iv) providing limited care driven by little time. Three facilitative themes were: (v) a human connection improves identification of emotional concerns and is therapeutic; (vi) exploring, explaining and negotiating a shared understanding or guiding patients towards new understandings and (vii) upfront information provision and involvement manages expectations about recovery and improves engagement in treatment. Conclusion The findings suggest that treatment guidelines should acknowledge: the therapeutic value of a positive GP–patient relationship; that diagnosis is a two-way negotiated process rather than an activity strictly in the doctor’s domain of expertise; and the value of exploring and shaping new understandings about patients’ emotional concerns and their management

Patients' experiences of seeking help for emotional concerns in primary care: doctor as drug, detective and collaborator

Background NICE guidelines for the management of emotional concerns in primary care emphasise the importance of communication and a trusting relationship, which is difficult to operationalise in practice. Current pressures in the NHS mean that it is important to understand care from a patient perspective. This study aimed to explore patients’ experiences of primary care consultations for emotional concerns and what patients valued when seeking care from their GP. Methods Eighteen adults with experience of consulting a GP for emotional concerns participated in 4 focus groups. Data were analysed thematically. Results (1) Doctor as Drug: Patients’ relationship with their GP was considered therapeutic with continuity particularly valued. (2) Doctor as Detective and Validator: Patients were often puzzled by their symptoms, not recognising their emotional concerns. GPs needed to play the role of detective by exploring not just symptoms, but the person and their life circumstances. GPs were crucial in helping patients understand and validate their emotional concerns. (3) Doctor as Collaborator: Patients prefer a collaborative partnership, but often need to relinquish involvement because they are too unwell, or take a more active role because they feel GPs are ill-equipped or under too much pressure to help. Patients valued: GPs booking their follow up appointments; acknowledgement of stressful life circumstances; not relying solely on medication. Conclusions Seeking help for emotional concerns is challenging due to stigma and unfamiliar symptoms. GPs can support disclosure and understanding of emotional concerns by fully exploring and validating patients’ concerns, taking into account patients’ life contexts. This process of exploration and validation forms the foundation of a curative, trusting GP-patient relationship. A trusting relationship, with an emphasis on empathy and understanding, can make patients more able to share involvement in their care with GPs. This process is cyclical, as patients feel that their GP is caring, interested, and treating them as a person, further strengthening their relationship. NICE guidance should acknowledge the importance of empathy and validation when building an effective GP-patient partnership, and the role this has in supporting patients’ involvement in their care