A study of the use of vibration and stress wave sensing for the detection of bearing failure

Results from an experimental study of vibrations and stress waves emitted from ball bearings are presented. Fatique tests were run with both high quality bearings and man faulted bearings, all of one size. Tests were instrumented with different sensors to detect the noises from 10 Hz to 1 MHz. Frequency spectrum plots are presented. The modulation characteristics of the ultrasonic noises were analyzed, and acoustic emission type measurements were conducted. Results are presented which show that there are usable acoustic signal levels even beyond 500 KHz. These signal levels are modulated by a low frequency carrier which is a function of the stress loading and acoustic transmissibility. The results were correlated to fault size in the bearings. The correlation shows that the sensor used for signals from 100 KHz to 1 MHz gave the best sensitivity and detected the generation of very small spalls or pits

Pulsar Searches with the SKA

The Square Kilometre Array will be an amazing instrument for pulsar astronomy. While the full SKA will be sensitive enough to detect all pulsars in the Galaxy visible from Earth, already with SKA1, pulsar searches will discover enough pulsars to increase the currently known population by a factor of four, no doubt including a range of amazing unknown sources. Real time processing is needed to deal with the 60 PB of pulsar search data collected per day, using a signal processing pipeline required to perform more than 10 POps. Here we present the suggested design of the pulsar search engine for the SKA and discuss challenges and solutions to the pulsar search venture.Comment: 4 pages, 1 figure. To be published in Proceedings of IAU Symposium 337: Pulsar Astrophysics - The Next 50 Year

Persistent sex disparities in clinical outcomes with percutaneous coronary intervention: Insights from 6.6 million PCI precedures in the United States

Background Prior studies have reported inconsistencies in the baseline risk profile, comorbidity burden and their association with clinical outcomes in women compared to men. More importantly, there is limited data around the sex differences and how these have changed over time in contemporary percutaneous coronary intervention (PCI) practice. Methods and results We used the Nationwide Inpatient Sample to identify all PCI procedures based on ICD-9 procedure codes in the United States between 2004–2014 in adult patients. Descriptive statistics were used to describe sex-based differences in baseline characteristics and comorbidity burden of patients. Multivariable logistic regressions were used to investigate the association between these differences and in-hospital mortality, complications, length of stay and total hospital charges. Among 6,601,526 patients, 66% were men and 33% were women. Women were more likely to be admitted with diagnosis of NSTEMI (non-ST elevation acute myocardial infarction), were on average 5 years older (median age 68 compared to 63) and had higher burden of comorbidity defined by Charlson score ≥3. Women also had higher in-hospital crude mortality (2.0% vs 1.4%) and any complications compared to men (11.1% vs 7.0%). These trends persisted in our adjusted analyses where women had a significant increase in the odds of in-hospital mortality men (OR 1.20 (95% CI 1.16,1.23) and major bleeding (OR 1.81 (95% CI 1.77,1.86). Conclusion In this national unselected contemporary PCI cohort, there are significant sex-based differences in presentation, baseline characteristics and comorbidity burden. These differences do not fully account for the higher in-hospital mortality and procedural complications observed in women

2004-2005 International Whaling Commission-Southern Ocean Whale and Ecosystem Research (IWC-SOWER) Cruise, Area III

We conducted the 27th annual IWC-SOWER (formerly IDCR) Cruise in Area III (000°-070°E) aboard the Japanese Research Vessels Shonan Maru and Shonan Maru No.2. The 65-day cruise departed Cape Town, South Africa on 4 January 2005 and returned to Fremantle, Australia on 9 March 2005. After transiting to the study area, we carried out a minke whale survey and several research experiments from 12 January to 25 February. A systematic minke whale survey was conducted in Area IIIW (000°-035°E) from 12 January until 8 February. The survey design was intentionally similar to that used during the IWC/IDCR second circumpolar series of cruises (CPII) to provide information towards addressing the effect of changing cruise track design on Antarctic minke whale abundance estimates. 000°-020°E was surveyed in two contiguous strata (Northern and Southern), from 64°30'S to the ice edge. Poor weather limited the coverage 020°E-035°E to the Southern Stratum only. A total of 1788.2 nmiles was surveyed (000°-035°E) including 935.5 nmiles in closing mode and 930.3 nmiles in independent observer mode, and a total of 466 minke whales were sighted. Minke whale visual dive time experiments were conducted during the minke whale survey. 35 trials were completed, recording surfacing cues for a total of 45.81 hours. From 10-22 February the ships conducted collaborative studies with the Japanese icebreaker, Shirase to investigate the relationship between minke whale abundance and the sea ice. During this study the SOWER vessels surveyed for minke whales in the near-ice area from 035°-050°E. 575.3 nmiles were covered and a total of 22 minke whales were detected. The Shirase surveyed in the pack ice zone 040°-050°E from 12-15 February. Two methods-testing experiments were carried out during the cruise: Adaptive Line Transect Sampling and ‘BT Mode.’ Adaptive Line Transect Sampling was tested during survey in Area IIIW. BT Mode trials were conducted 22-25 February in the area between 050° and 065°E. A direct electronic data acquisition program was evaluated during the cruise on both ships. Sightings for the entire cruise included: minke whales (237 groups/515 animals); blue whales (13 groups/46 individuals) of which 6 groups (28 individuals) were identified as true blue whales and 3 groups (3 individuals) were identified as pygmy blue whales; fin whales (14/132); humpback whales (251/646); sperm whales (35/49); killer whales (23/217); southern bottlenose whales (32/60); Gray’s beaked whales (1/7); Layard’s beaked whales (2/3); pilot whales (4/265); hourglass dolphins (4/17); striped dolphins (3/435) and common bottlenose dolphins (1/20). Opportunistic research during the cruise included blue whale research on 8 groups/29 animals resulting in 5 biopsies and images of 23 individuals for photo-identification studies. Biopsy samples and photo-ID images were also obtained opportunistically from other species. Biopsies were collected from 6 humpback whales and 1 southern right whale. Photo-ID images were collected from 45 humpback whales, 1 southern right whale and 8 groups of killer whales. Estimated Angle and Distance Training Exercise and Experiment were each completed on both vessels

The human resource implications of improving financial risk protection for mothers and newborns in Zimbabwe

Peer reviewedPublisher PD

Motivation and incentives of rural maternal and neonatal health care providers: a comparison of qualitative findings from Burkina Faso, Ghana and Tanzania.

In Burkina Faso, Ghana and Tanzania strong efforts are being made to improve the quality of maternal and neonatal health (MNH) care. However, progress is impeded by challenges, especially in the area of human resources. All three countries are striving not only to scale up the number of available health staff, but also to improve performance by raising skill levels and enhancing provider motivation. In-depth interviews were used to explore MNH provider views about motivation and incentives at primary care level in rural Burkina Faso, Ghana and Tanzania. Interviews were held with 25 MNH providers, 8 facility and district managers, and 2 policy-makers in each country. Across the three countries some differences were found in the reasons why people became health workers. Commitment to remaining a health worker was generally high. The readiness to remain at a rural facility was far less, although in all settings there were some providers that were willing to stay. In Burkina Faso it appeared to be particularly difficult to recruit female MNH providers to rural areas. There were indications that MNH providers in all the settings sometimes failed to treat their patients well. This was shown to be interlinked with differences in how the term 'motivation' was understood, and in the views held about remuneration and the status of rural health work. Job satisfaction was shown to be quite high, and was particularly linked to community appreciation. With some important exceptions, there was a strong level of agreement regarding the financial and non-financial incentives that were suggested by these providers, but there were clear country preferences as to whether incentives should be for individuals or teams. Understandings of the terms and concepts pertaining to motivation differed between the three countries. The findings from Burkina Faso underline the importance of gender-sensitive health workforce planning. The training that all levels of MNH providers receive in professional ethics, and the way this is reinforced in practice require closer attention. The differences in the findings across the three settings underscore the importance of in-depth country-level research to tailor the development of incentives schemes

Adaptation responses to climate change differ between global megacities

Urban areas are increasingly at risk from climate change, with negative impacts predicted for human health, the economy and ecosystems1, 2. These risks require responses from cities to improve their resilience. Policymakers need to understand current adaptation spend to plan comprehensively and effectively. Through the measurement of spend in the newly defined ‘adaptation economy’, we analyse current climate change adaptation efforts in ten megacities. In all cases, the adaptation economy remains a small part of the overall economy, representing a maximum of 0.33% of a city’s gross domestic product (here referred to as GDPc). Differences in total spend are significant between cities in developed, emerging and developing countries, ranging from £15 million to £1,600 million. Comparing key subsectors, we demonstrate the differences in adaptation profiles. Developing cities have higher proportional spend on health and agriculture, whereas developed cities have higher spend on energy and water. Spend per capita and percentage of GDPc comparisons more clearly show disparities between cities. Developing country cities spend half the proportion of GDPc and significantly less per capita, suggesting that adaptation spend is driven by wealth rather than the number of vulnerable people. This indicates that current adaptation activities are insufficient in major population centres in developing and emerging economies

Searching for interstellar C60+ using a new method for high signal-to-noise HST/STIS spectroscopy

Due to recent advances in laboratory spectroscopy, the first optical detection of a very large molecule has been claimed in the diffuse interstellar medium (ISM): ${{\rm{C}}}_{60}^{+}$ (ionized Buckminsterfullerene). Confirming the presence of this molecule would have significant implications regarding the carbon budget and chemical complexity of the ISM. Here we present results from a new method for ultra-high signal-to-noise ratio (S/N) spectroscopy of background stars in the near-infrared (at wavelengths of 0.9–1 μm), using the Hubble Space Telescope (HST) Imaging Spectrograph (STIS) in a previously untested "STIS scan" mode. The use of HST provides the crucial benefit of eliminating the need for error-prone telluric-correction methods in the part of the spectrum where the ${{\rm{C}}}_{60}^{+}$ bands lie and where the terrestrial water vapor contamination is severe. Our STIS spectrum of the heavily reddened B0 supergiant star BD+63 1964 reaches an unprecedented S/N for this instrument (~600–800), allowing the detection of the diffuse interstellar band (DIB) at 9577 Å attributed to ${{\rm{C}}}_{60}^{+}$, as well as new DIBs in the near-IR. Unfortunately, the presence of overlapping stellar lines, and the unexpected weakness of the ${{\rm{C}}}_{60}^{+}$ bands in this sightline, prevents conclusive detection of the weaker ${{\rm{C}}}_{60}^{+}$ bands. A probable correlation between the 9577 Å DIB strength and interstellar radiation field is identified, which suggests that more strongly irradiated interstellar sightlines will provide the optimal targets for future ${{\rm{C}}}_{60}^{+}$ searches