Resonant diaphragm pressure measurement system with ZnO on Si excitation

The principle of measuring pressure by means of a resonant diaphragm has been studied. An oscillator consisting of an integrated amplifier with a piezoelectrically driven diaphragm in its feedback loop has been built. The oscillator frequency is accurately proportional to the square of the pressure in the range of 60 to 130 Torr.\ud The frequency range is 1324 to 1336 Hz (this range being limited by a spurious mode which could be suppressed by better processing) for a 25 mm diameter diaphragm made of a silicon wafer and with PZT ceramics as driver and receptor. We have made an integrated version (1 × 1 mm2) of a square resonant diaphragm pressure guage by selective etching of (1 0 0) planes with ethylenediamine. The piezoelectric driving materials was sputtered zinc oxide. A driver was deposited midway between the bending point and the point of greatest curvature.\ud A receptor was located at a symmetrical position to give a optimum transfer condition.\ud The integrated current amplifier had a low impedance differential input stage, two gain cells and a high impedance output stage. These electrical conditions ensured maximum elastic freedom of the diaphragm. A digital circuit in I2L technology has been designed and made with eight-bit parallel read out of the frequency. This circuit may be directly connected to a microprocessor. The whole system contains the sensor chip, the analog amplifier chip and the digital chip, all in compatible technology.\ud \u

COVID-19 Implications for Scenarios and Modelling and Considerations Moving Forward: Perspectives from the Integrated Assessment Modelling Community

Presentation given at the informal virtual meeting hosted by the SBSTA Chair with representatives from the research and systematic observation community and UNFCCC constituted bodies.The event aimed to provide an opportunity for discussing the impact of the COVID-19 crisis on climate research and systematic observation, new opportunities emerging from this crisis for recovering better and what has changed and what needs to change in scientific communication on climate change

Atypical chest pain: Needles in a haystack

A 20-year-old man presented with a 6-month history of intermittent chest pain. Initial imaging demonstrated approximately 15 sewing needles lodged in his myocardium, predominantly in the left ventricle. The patient has been referred to cardiothoracic surgery for further management. His progress will be monitored closely

Developing health enhancing physical activity modules for higher and vocational education

Health enhancing physical inactivity is a growing concern leading to health problems in Europe and nationwide. WHO (2017) stated that the current levels of physical inactivity are the consequence of insufficient participation in physical activity and an increase in sedentary behavior. The British Heart Foundation (2015) also reported that 13 to 15 years in England were sedentary for six hours or more for both genders (boys = 24%, girls = 16%) on weekdays, and there was a spike of sedentary behaviour on weekend days with 43% of boys and 37% for this age group. The "Sport, Physical Education and Coaching for Health" (SPEACH) project, is an Erasmus+ Programme of the European Union (2015-2017). The key purpose of the project to prepare professional practitioners in higher and vocational education in the areas of Physical Education, Sports and Physical Activity to change behaviors of the citizens of Europe and increase physical activity. To achieve this, the project culminated in developing, validating, piloting and evaluating five Health Enhancing Physical Activity (HEPA) related modules, which may be embedded into existing education structures in the areas of Physical Education, Sports and Physical Activity. The design of the HEPA modules attempts to test a cutting edge multidisciplinary approach that bridges the gap between research / theory and practice (Armour, 2014). The needs analysis phase of the project comprised survey responses of 660 students in higher and vocational education studying Physical Education, Sports and Physical Activity from seven European countries; 14 interviewees with subject experts; and a focus group with professional and academic field experts. The results demonstrated that students in particular welcome a multidisciplinary approach for module content. The combination of “dual” content themes in modules was a key innovation that students responded favourably to, therefore HEPA modules covered themes such as changing behavior; personal leadership; physical activity for special target groups; health policy; linked to young people, their families and sport; management; nutrition, walking sports and healthy aging; and so on.. Surveyed students’ views of desirable pedagogy / didactics for these modules were practice oriented; training; internship / work based; group-and classroom based teaching. Three HEPA modules were piloted in a real-life setting in an intensive week of teaching (20 hours) each module to three groups of undergraduate students from Physical Education, Sports and Physical Activity from Europe that opted to participate in the pilot study. The developed HEPA modules were evaluated by students and staff; and the findings demonstrated relevance, enjoyment, flexibility and differentiated levels of instruction that will facilitate the embedding of any of these modules at vocational, bachelor as well as master level. These modules will be available online in an open resource that will facilitate free access, collaboration and cooperation of stakeholders in higher and vocational education in the areas of Physical Education, Sports and Physical Activity

Classification of organizational failure root causes producing human error

The formal study of human error is relatively recent, especially in medical domain, and is tied closely to a several other relatively new fields. Organizational root cause of human error is less considered. Despite growing social, industrial and scientific interest in the organizational causes of incidents, the concept of organizational failure and related tools are still less considered in many developing countries e.g. Iran. Also, there is few incident record-keeping in medical domain on human error. Therefore, this study draws on case study research to investigate the applicability of a European taxonomy of organizational failure in Iran, in aviation domain with a fair incident record-keeping. This case study resulted in 10 incident in-depth descriptions, which occurred during one year in a part of civil aviation due to operator error. Within each case study, an explanation building method is used to develop a tool for classifying organizational root causes. Results include 100 root causes. The distribution of organizational root causes over the main categories of the former taxonomy shows a need to add a new sub-category to improve its applicability in Iran. The new sub-category is related to culture

How Low Can We Go? The Implications of Delayed Ratcheting and Negative Emissions Technologies on Achieving Well Below 2 °C

Pledges embodied in the nationally determined contributions (NDCs) represent an interim step from a global “no policy” path towards an optimal long-term global mitigation path. However, the goals of the Paris Agreement highlight that current pledges are insufficient. It is, therefore, necessary to ratchet-up parties’ future mitigation pledges in the near-term. The ambitious goals of remaining well below 2 °C and pursuing reductions towards 1.5 °C mean that any delay in ratcheting-up commitments could be extremely costly or may even make the targets unachievable. In this chapter, we consider the impacts of delaying ratcheting until 2030 on global emissions trajectories towards 2 °C and 1.5 °C, and the role of offsets via negative emissions technologies (NETs). The analysis suggests that delaying action makes pursuing the 1.5 °C goal especially difficult without extremely high levels of negative emissions technologies (NETs), such as carbon capture and storage combined with bioenergy (BECCS). Depending on the availability of biomass, other NETs beyond BECCS will be required. Policymakers must also realise that the outlook for fossil fuels are closely linked to the prospects for NETs. If NETs cannot be scaled, the levels of fossil fuels suggested in this analysis are not compatible with the Paris Agreement goals i.e. there are risks of lock-in to a high fossil future. Decision makers must, therefore, comprehend fully the risks of different strategies

Mental health in high-tech system

Stress and mental health at the place of work have received great attention by researchers. In spite of technology improvement in high-tech systems, the operators face new problems, which can affect mental health. There is hardly any published research about stress or mental health in such workplaces in developing countries. This paper presents the application of the self-rating scale General Health Questionnaire (GHQ-28) to study mental health of 160 controllers working in a part of Air Traffic Control (ATC) as a high tech system in Iran. Logistic regression analysis showed that demographic variables did not exhibit a statistically significant effect on scores of the test. In order to compare mental health of these operators with general population, an exposure / non-exposure study was designed. Three age groups (less than 29 years, 30 through 39 y, and more than 40 y) were compared in exposed and non-exposed groups. The results of Fisher’s exact test showed that mental distress symptoms were significantly higher in the exposed group. There were significant job effects on somatization, anxiety and depression as well as on the total score of GHQ-28 for the two first age groups (P<.05). No significant effects of the job were found on social dysfunction symptoms in any age groups. The risk ratio of expressing depression and anxiety symptoms were more than three times greater in these operators than general population

What do near-term observations tell us about long-term developments in greenhouse gas emissions? A letter

Long-term scenarios developed by integrated assessment models are used in climate research to provide an indication of plausible long-term emissions of greenhouse gases and other radiatively active substances based on developments in the global energy system, land-use and the emissions associated with these systems The phenomena that determine these long-term developments (several decades or even centuries) are very different than those that operate on a shorter time-scales (a few years) Nevertheless, in the literature, we still often find direct comparisons between short-term observations and long-term developments that do not take into account the differing dynamics over these time scales In this letter, we discuss some of the differences between the factors that operate in the short term and those that operate in the long term We use long-term historical emissions trends to show that short-term observations are very poor indicators of long-term future emissions developments Based on this, we conclude that the performance of long-term scenarios should be evaluated against the appropriate, corresponding long-term variables and trends The research community may facilitate this by developing appropriate data sets and protocols that can be used to test the performance of long-term scenarios and the models that produce the