7,211 research outputs found

    Experimental investigation of flow over a backward facing step-progress report

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    The sizes and arrangement of the wind tunnel used for the experimentation are described. The specifications for the cold-wire anemometers, hot-wire anemometers, cold-wire rakes, and miniature 3-wire probe are proveded. The results of the experiment are briefly discussed

    Communications satellite systems capacity analysis

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    Analog and digital modulation techniques are compared with regard to efficient use of the geostationary orbit by communications satellites. Included is the definition of the baseline systems (both space and ground segments), determination of interference susceptibility, calculation of orbit spacing, and evaluation of relative costs. It is assumed that voice or TV is communicated at 14/11 GHz using either FM or QPSK modulation. Both the Fixed-Satellite Service and the Broadcasting-Satellite Service are considered. For most of the cases examined the digital approach requires a satellite spacing less than or equal to that required by the analog approach

    PON1 status does not influence cholinesterase activity in Egyptian agricultural workers exposed to chlorpyrifos.

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    Animal studies have shown that paraoxonase 1 (PON1) genotype can influence susceptibility to the organophosphorus pesticide chlorpyrifos (CPF). However, Monte Carlo analysis suggests that PON1 genotype may not affect CPF-related toxicity at low exposure conditions in humans. The current study sought to determine the influence of PON1 genotype on the activity of blood cholinesterase as well as the effect of CPF exposure on serum PON1 in workers occupationally exposed to CPF. Saliva, blood and urine were collected from agricultural workers (n=120) from Egypt's Menoufia Governorate to determine PON1 genotype, blood cholinesterase activity, serum PON1 activity towards chlorpyrifos-oxon (CPOase) and paraoxon (POase), and urinary levels of the CPF metabolite 3,5,6-trichloro-2-pyridinol (TCPy). The PON1 55 (P≤0.05) but not the PON1 192 genotype had a significant effect on CPOase activity. However, both the PON1 55 (P≤0.05) and PON1 192 (P≤0.001) genotypes had a significant effect on POase activity. Workers had significantly inhibited AChE and BuChE after CPF application; however, neither CPOase activity nor POase activity was associated with ChE depression when adjusted for CPF exposure (as determined by urinary TCPy levels) and stratified by PON1 genotype. CPOase and POase activity were also generally unaffected by CPF exposure although there were alterations in activity within specific genotype groups. Together, these results suggest that workers retained the capacity to detoxify chlorpyrifos-oxon under the exposure conditions experienced by this study population regardless of PON1 genotype and activity and that effects of CPF exposure on PON1 activity are minimal

    Are women birthing in New South Wales hospitals satisfied with their care?

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    Abstract Background Surveys of satisfaction with maternity care among Australian women have been conducted using overnight inpatient surveys and dedicated maternity surveys in a number of Australian states and territories, however to date no information on satisfaction with maternity care has been published for women birthing in New South Wales. The aim of this study was to investigate the effects of pregnancy and birth characteristics, hospital location and type of care provision on patient satisfaction with hospital care at the time of birth. Results Analysis of responses from 5,367 obstetric patients completing overnight patient surveys between 2007 and 2011 revealed three quarters of women were satisfied with care provided in hospital. Compared with women who had previously given birth, first-time mothers were more likely to recommend their birth hospital to friends and family (60.5% versus 56.4%; P<0.05), less likely to have experienced differing messages from staff (44.8% vs 59.4%; P<0.001), and less likely to feel they had received sufficient information about feeding (58.8% vs 65.0%; P<0.001) and caring for their babies (52.4% vs 65.2%; P<0.001). Women having a caesarean birth were more likely to have a negative experience of differing messages from doctors and nurses than women giving birth vaginally (52.7% vs 44.3%; P<0.001). While metropolitan women were more likely to rate their birth hospital positively (76.0% vs. 71.3%; P<0.05) than their rural counterparts, rural women tended to rate the care they received (68.1% vs. 63.4%; P<0.05), and doctors (70.7% vs 61.1%; P<0.05) and nurses (73.5% vs. 66.9%; P<0.001) more highly than metropolitan women. Conclusions The overall picture of maternity care satisfaction in New South Wales is a positive one, with three quarters of women satisfied with care. The differences in care ratings among some subgroups of women (for instance, by parity and rurality) may assist in targeting allocation of resources to improve maternity satisfaction. Further resources could be dedicated to ensuring consistency and amount of information provided, particularly to first-time mothers.Australian Research Council Future Fellowship (#FT120100069)

    A Triphasic Sorting System: Coordination Cages in Ionic Liquids.

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    Host-guest chemistry is usually carried out in either water or organic solvents. To investigate the utility of alternative solvents, three different coordination cages were dissolved in neat ionic liquids. By using (19) F NMR spectroscopy to monitor the presence of free and bound guest molecules, all three cages were demonstrated to be stable and capable of encapsulating guests in ionic solution. Different cages were found to preferentially dissolve in different phases, allowing for the design of a triphasic sorting system. Within this system, three coordination cages, namely Fe4 L6 2, Fe8 L12 3, and Fe4 L4 4, each segregated into a distinct layer. Upon the addition of a mixture of three different guests, each cage (in each separate layer) selectively bound its preferred guest.This work was supported by the European Research Council (259352). We also thank the Cambridge Chemistry NMR service for experimental assistance.This is the author accepted manuscript. The final version is available from Wiley via http://dx.doi.org/10.1002/anie.20150577

    Entangled two atoms through different couplings and the thermal noise

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    The entanglement of two atoms is studied when the two atoms are coupled to a single-mode thermal field with different couplings. The different couplings of two atoms are in favor of entanglement preparation: it not only makes the case of absence entanglement with same coupling appear entanglement, but also enhances the entanglement with the increasing of the relative difference of two couplings. We also show that the diversity of coupling can improved the critical temperature. If the optical cavity is leaky during the time evolution, the dissipative thermal environment is benefit to produce the entanglement.Comment: 4 pages, 4 figure

    Parallelizing Synthesis from Temporal Logic Specifications by Identifying Equicontrollable States

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    For the synthesis of correct-by-construction control policies from temporal logic specifications the scalability of the synthesis algorithms is often a bottleneck. In this paper, we parallelize synthesis from specifications in the GR(1) fragment of linear temporal logic by introducing a hierarchical procedure that allows decoupling of the fixpoint computations. The state space is partitioned into equicontrollable sets using solutions to parametrized games that arise from decomposing the original GR(1) game into smaller reachability-persistence games. Following the partitioning, another synthesis problem is formulated for composing the strategies from the decomposed reachability games. The formulation guarantees that composing the synthesized controllers ensures satisfaction of the given GR(1) property. Experiments with robot planning problems demonstrate good performance of the approach

    Efficacy of Online Training for Improving Camp Staff Competency

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    Preparing competent staff is a critical issue within the camp community. This quasi-experimental study examined the effectiveness of an online course for improving staff competency in camp healthcare practices among college-aged camp staff and a comparison group (N = 55). We hypothesized that working in camp would increase competency test scores due to opportunities for staff to experientially apply knowledge learned online. Hierarchical linear modeling was used to analyse the cross-level effects of a between-individuals factor (assignment to experimental or comparison group) and within-individual effects of time (pre-test, post-test #1, and post-test #2) on online course test scores. At post-test #2, the difference in average test scores between groups was ~30 points, with the treatment group scoring lower on average than the comparison group. Factors that may have influenced these findings are explored, including fatigue and the limited durability of online learning. Recommendations for research and practice are discussed
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