The TESS mission has enabled discoveries of the brightest transiting planet systems around young stars. These systems are the benchmarks for testing theories of planetary evolution. We report the ...discovery of a mini-Neptune transiting a bright star in the AB Doradus moving group. HIP 94235 (TOI-4399, TIC 464646604) is a Vmag=8.31 G-dwarf hosting a 3.00 -0.28/+0.32 Rearth mini-Neptune in a 7.7 day period orbit. HIP 94235 is part of the AB Doradus moving group, one of the youngest and closest associations. Due to its youth, the host star exhibits significant photometric spot modulation, lithium absorption, and X-ray emission. Three 0.06% transits were observed during Sector-27 of the TESS Extended Mission, though these transit signals are dwarfed by the 2% peak-to-peak photometric variability exhibited by the host star. Follow-up observations with CHEOPS confirmed the transit signal and prevented the erosion of the transit ephemeris. HIP 94235 is part of a 50 AU G-M binary system. We make use of diffraction limited observations spanning 11 years, and astrometric accelerations from Hipparchos and Gaia, to constrain the orbit of HIP 94235 B. HIP 94235 is one of the tightest stellar binaries to host an inner planet. As part of a growing sample of bright, young planet systems, HIP 94235 b is ideal for follow-up transit observations, such as those that investigate the evaporative processes driven by high-energy radiation that may sculpt the valleys and deserts in the Neptune population.
The imminent launch of space telescopes designed to probe the atmospheres of exoplanets has prompted new efforts to prioritise the thousands of transiting planet candidates for follow-up ...characterisation. We report the detection and confirmation of TOI-1842b, a warm Saturn identified by TESS and confirmed with ground-based observations from Minerva-Australis, NRES, and the Las Cumbres Observatory Global Telescope. This planet has a radius of \(1.04^{+0.06}_{-0.05}\,R_{Jup}\), a mass of \(0.214^{+0.040}_{-0.038}\,M_{Jup}\), an orbital period of \(9.5739^{+0.0002}_{-0.0001}\) days, and an extremely low density (\(\rho\)=0.252\(\pm\)0.091 g cm\(^{-3}\)). TOI-1842b has among the best known combinations of large atmospheric scale height (893 km) and host-star brightness (\(J=8.747\) mag), making it an attractive target for atmospheric characterisation. As the host star is beginning to evolve off the main sequence, TOI-1842b presents an excellent opportunity to test models of gas giant re-inflation. The primary transit duration of only 4.3 hours also makes TOI-1842b an easily-schedulable target for further ground-based atmospheric characterisation.
Summary
The suitability of radioallergosorbent test (RAST) inhibition to quantify occupational exposure to rat urinary aeroallergen (RUA) has been assessed. When using a constant pool of rat allergic ...sera, the reproducibility of the assay over 1 year was comparable to that reported for other immunoassays; at 50% RAST inhibition the inter‐assay coefficient of variation (CV) was 7.0% and the intra‐assay CV was 3.0%. The assay was highly specific for rat urine; mouse urine was 1100‐fold less potent at inhibiting the rat urine RAST system. Significant inter‐assay variation in the ‘high’ control was not due to batch variation and was relatively small when compared with the variation in RUA concentrations in the occupational environment. Measurement of workplace RUA exposure demonstrated that those directly involved in the care of rats experienced the highest RUA exposure of the nine occupational groups studied (animal technicians GM = 23.10/μg/m3) followed in decreasing order by those working with soiled litter (e.g. cage cleaners GM = 4.20 μg/m3), dead animals (e.g. post mortem GM = 1.60 μg/m3, scientists GM = 0.67 μg/m3) and rat tissue (e.g. slide production GM = 0.04μg/m3). In view of the complexity of rat allergens, RAST inhibition is an appropriate method for the quantification of occupational exposure to rats.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
As part of an epidemiological study among workers exposed to flour total dust and flour aeroallergen concentrations were measured with personal samplers over a workshift in three large bakeries and ...four flour mills and packing stations. In the bakeries geometric means for total dust concentrations ranged from 0.4 mg/m3 in the bread wrapping area up to 6.4 mg/m3 at the dough brake. The flour aeroallergen concentrations ranged from 45.5 micrograms/m3 in the bread wrapping area up to 252.0 micrograms/m3 in the confectionary area. In the flour mills and packing stations the concentrations were higher with geometric means for total dust ranging from 0.5 mg/m3 in the office up to 16.9 mg/m3 for hygiene workers in an old mill. The flour aeroallergen concentrations ranged from 101.5 micrograms/m3 for transport workers up to 1728.2 micrograms/m3 for hygiene workers. The relation between total dust and flour aeroallergen concentrations varied for different areas and depended on the use of products other than flour.
This paper sets out to explain the vital role of an operations strategy in e-business. Suggests, through various research findings, that a firm can employ a number of operations strategies, and that ...they each possess certain core building blocks. Further, when properly combined, these strategies can be customised to a particular situation and offer substantial benefits for an organisation in driving e-business best practices. The paper gives definitions and descriptions of operations management, e-business, e-operations and an operations strategy for e-business. The work is also supported by empirical research data in the form of a small case study.
This paper presents a simple passenger dynamics model built to ascertain the minimum safe stopping distance of a Personal Rapid Transit vehicle carrying a seated but unrestrained passenger. The ...decelerations, under which the passengers would remain in their seats and unharmed, were determined using a simple one degree of freedom mathematical model of a single, seated passenger. The investigation found that the response of passenger depended heavily on their age and sex with an older female passenger being the most easily put in danger. The safe stopping distance had to account for the worst case scenario and the nature of the deceleration profile was crucial with optimum jerk and deceleration rates needing to be determined. These values were found and an "optimum" deceleration profile produced. Initial tests have occurred with encouraging results and development of the model combined with further testing is planned.
As part of a longitudinal study to explore the exposure-response relationship between flour dust exposure and work-related symptoms and skin sensitivity the authors formed exposure groups and ...estimated various components of variability. This paper describes the between-exposure group, the between-worker and the within-worker variation of personal flour dust exposure in bakeries, flour mills and packing stations. In total 346 samples were collected in 13 exposure groups. The geometric means of the exposure groups ranged from 0.3 up to 9.0 mg m-3. Between-worker variances within exposure groups were less than the overall between-worker component although substantial differences in exposure between workers remained in some exposure groups. Overall the largest variance component was the between-exposure group component followed by the considerably smaller between-worker and within-worker components.
This paper describes the relationship between continuous and grouped variables for several measures of exposure in a longitudinal study of bakery workers and flour millers. Average shift and peak ...levels, both for dust and for flour aeroallergen were measured duration of exposure obtained from questionnaire and cumulative exposure both for dust and for flour aeroallergen calculated. Neither for dust nor for flour aeroallergen was there a correlation between duration of exposure and intensity measures of exposure (peak and average). Moderate to good correlation existed between the various intensity measures of exposures both for dust and for flour aeroallergen. Good correlations existed between measures of exposure of dust and measures of exposure for flour aeroallergen. The degree of correlation was reflected by the fact that the number of workers changing categories depended on which measure of exposure was considered. The higher the correlation coefficient between various measures of exposure the fewer workers changed category. This information provides important information for a better understanding of the exposure-response relationship amongst bakery workers and flour millers.
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