Development of on-line FTIR spectroscopy for siloxane detection in biogas to enhance carbon contactor management

Activated carbon filters are used to limit engine damage by siloxanes when biogas is utilised to provide electricity. However, carbon filter siloxane removal performance is poorly understood as until recently, it had not been possible to measure siloxanes on-line. In this study, on-line Fourier Transform Infrared (FTIR) spectroscopy was developed to measure siloxane concentration in real biogas both upstream (86.1–157.5 mg m−3) and downstream (2.2–4.3 mg m−3) of activated carbon filters. The FTIR provided reasonable precision upstream of the carbon vessel with a root mean square error of 10% using partial least squares analysis. However, positive interference from volatile organic carbons was observed in downstream gas measurements limiting precision at the outlet to an RMSE of 1.5 mg m−3 (47.8%). Importantly, a limit of detection of 3.2 mg m−3 was identified which is below the recommended siloxane limit and evidences the applicability of on-line FTIR for this application

Repetitive Behavior in Rubinstein–Taybi Syndrome:Parallels with Autism Spectrum Phenomenology

Syndrome specific repetitive behavior profiles have been described previously. A detailed profile is absent for Rubinstein–Taybi syndrome (RTS). The Repetitive Behaviour Questionnaire and Social Communication Questionnaire were completed for children and adults with RTS (N = 87), Fragile-X (N = 196) and Down (N = 132) syndromes, and individuals reaching cut-off for autism spectrum disorder (N = 228). Total and matched group analyses were conducted. A phenotypic profile of repetitive behavior was found in RTS. The majority of behaviors in RTS were not associated with social-communication deficits or degree of disability. Repetitive behavior should be studied at a fine-grained level. A dissociation of the triad of impairments might be evident in RTS

Randomised controlled trial and economic evaluation of a targeted cancer awareness intervention for adults living in deprived areas of the UK

Background: Cancer outcomes are poor in socioeconomically deprived communities, with low symptom awareness contributing to prolonged help-seeking and advanced disease. Targeted cancer awareness interventions require evaluation. Methods: Randomised controlled trial involving adults aged 40+ recruited in community and healthcare settings in deprived areas of South Yorkshire and South-East Wales. Intervention: personalised behavioural advice facilitated by a trained lay advisor. Control: usual care. Follow-up at 2-weeks and 6-months post-randomisation. Primary outcome: total cancer symptom recognition score 2-weeks post-randomisation. Results: 234 participants were randomised. The difference in total symptom recognition at 2-weeks [adjusted mean difference (AMD) 0.6, 95% CI:-0.03, 1.17, p=0.06] was not statistically significant. Intervention participants reported increased symptom recognition (AMD 0.8, 95% CI:0.18, 1.37, p=0.01) and earlier intended presentation (AMD -2.0, 95% CI:-3.02, -0.91, p<0.001) at 6-months. “Lesser known” symptom recognition was higher in the intervention arm (2-weeks AMD 0.5, 95% CI:0.03, 0.97 and 6-months AMD 0.7, 95% CI:0.16, 1.17). Implementation cost per participant was £91.34, with no significant between-groups differences in healthcare resource use post-intervention. Conclusions: Improved symptom recognition and earlier anticipated presentation occurred at longer-term follow-up. The ABACus Health Check is a viable low-cost intervention to increase cancer awareness in socioeconomically deprived communities. Clinical Trial Registration: ISRCTN1687254

Improving cancer symptom awareness and help-seeking among adults living in socioeconomically deprived communities in the UK using a facilitated health check: A protocol for the Awareness and Beliefs About Cancer (ABACus) Randomised Control Trial

Background Cancer survival is lower in socioeconomically deprived communities, partly due to low awareness of symptoms, negative beliefs and delayed help-seeking. We developed an interactive health check questionnaire facilitated by trained lay advisors. It entails 29 questions about background, lifestyle and health with tailored behaviour change advice. Personalised results are printed using a traffic light (red/amber/green) system, highlighting areas where action should be taken. This is an individually randomised control trial to test effectiveness of the health check on symptom recognition. Methods A total 246 participants aged 40+ years will be recruited from community and healthcare settings in socioeconomically deprived areas of Yorkshire and South Wales. Participants will be randomised to receive the health check or standard care (1:1 ratio). Outcome measures include: adapted Awareness and Beliefs about Cancer (primary outcome), brief State Trait Anxiety Inventory, intentions and motivation to adopt recommended health behaviours (early symptom presentation, cancer screening and lifestyle behaviours), adapted Client Service Receipt Inventory, brief medical history/screening and demographic questionnaire at: baseline; 2-weeks; and 6-months post-randomisation. A purposive sample of intervention sessions will be audio-recorded (n = 24) and half will additionally be observed (n = 12). Semi-structured interviews will take place at 2-weeks (n = 30) and 6-months (n = 15–20) post-randomisation. The primary analysis will compare cancer symptom recognition scores between arms at 2-weeks. Secondary analysis will assess cancer beliefs, barriers/time to presentation, screening and lifestyle behaviours, anxiety and costs. A process evaluation will assess intervention fidelity, dose and contamination

26th Annual Computational Neuroscience Meeting (CNS*2017): Part 3 - Meeting Abstracts - Antwerp, Belgium. 15–20 July 2017

This work was produced as part of the activities of FAPESP Research,\ud Disseminations and Innovation Center for Neuromathematics (grant\ud 2013/07699-0, S. Paulo Research Foundation). NLK is supported by a\ud FAPESP postdoctoral fellowship (grant 2016/03855-5). ACR is partially\ud supported by a CNPq fellowship (grant 306251/2014-0)

Removal of Siloxanes from Biogas

Economic utilisation of biogas arising from sewage sludge is hampered by the need to remove siloxanes, which damage gas engines upon combustion. This thesis applies on-line Fourier transform infrared spectroscopy to measure siloxanes in biogas upstream and downstream of the activated carbon vessels designed to adsorb siloxanes. On-line analysis provides accurate measurement of siloxane concentrations with a detection limit below the siloxane limits set by engine manufacturers, high data intensity and timely identification of breakthrough. Cost savings of up to £0.007 kWh- 1 may be realised compared to existing grab sampling. Using on-line analysis, the performance of full-scale and bench-scale carbon vessels were measured. Full-scale carbon contactors are typically operated at Reynold’s numbers close to the boundary between the laminar and transitional regimes (Re = 40 - 55). This thesis demonstrates, at full- and bench-scale, that increasing the Reynold’s number to site the adsorption process in the transitional regime increases media capacity, by 36% in dry gas and by 400% at 80% humidity. It is postulated that the change in gas velocity profile which occurs as Reynold’s number increases reduces the resistance to siloxane transport caused by gas and water films around the carbon particles, and therefore increases the rate of the overall adsorption process. In the laminar regime (Re = 31) increasing humidity from zero to 80% led to the classical stepwise reduction in adsorption capacity observed by other researchers, caused by the increasing thickness of the water film, but in the transitional regime (Re = 73) increasing humidity had no effect as no significant water film develops. It is therefore recommended that siloxane adsorption vessels should be designed to operate at Reynold’s numbers above 55. By choosing a high aspect ratio (tall and thin) both Reynold’s number and contact time can be optimised

PHOTOFRAGMENT SPECTROSCOPY OF CS2CS_{2} AT 206-200 nm

Author Institution: Centre for Molecular Beams and Laser Chemistry, University of WaterlooThe photofragmentation of $CS_{2}$ in the region 206-200 nm has been studied under supersonic molecular beam conditions, with the S atom products being detected by vacuum ultraviolet laser-induced fluorescence. The excitation spectrum for the $S(^{1}D_{2})$ and $S(^{3}P_{2})$ products can be measured by scanning the photolysis laser over the $\bar{B} ^{1} \Sigma _{\mu}^{+}(^{1}B_{2})\leftarrow X^{1}\Sigma_{g}^{+}$ absorption system. These spectra provide information on the spectroscopy and dynamics of the predissociating B state

SPECTROSCOPY AND PHOTODISSOCIATION DYNAMICS OF THE PREDISSOCIATING 1B2^{1}B_{2} STATE OF THE CS2CS_{2}

Author Institution: Department of Chemistry, University of Waterloo; Department of Chemistry, Laboratoire de Chimie Th\'{e}oriquePhotofragment spectroscopy has been used to study the spectroscopy and detailed photodissociation dynamics of the predissociating $^{1}B_{2}$ state of $CS_{2}$. The target is prepared in a seeded supersonic expansion, yielding a rotationally cold sample with variable vibrational temperature. Photolysis by a pulsed dye laser in the 215-200 nm wavelength range gives rise to two possible channels: CS_{2}+h\nu\rightarrow CS_{2}^*(^{1} B_{2})\rightarrow CS (X^{1}\Sigma^*)+S(^{1} D_{2})\rightarrow CS (X^{1}\Sigma^{+})+ S(^{3} P_{1}) with a quantum yield for photodissociation of -100\%. These channels can be probed separately by excitation of sulfur resonance lines at 144.8 nm for the $^{1}D_{2}$ channel, and between 147.4nm and 148.7nm for the three spin-orbit sublevels of the $^{3}P_{1}$ channel, using frequency upconverted pulsed dye laser radiation. By fixing the detection wavelength to a specific product channel, we can measure an excitation spectrum for that channel. Thus, We were able to msp out the absorption spectrum of jet-cooled $CS_{2}$, and we are using a semi-rigid bender treatment to analyse the very complicated spectrum. After identifying the different bands, we probed the dynamics of the photodissociation process by fixing the photolysis wavelength and scanning the VUV probe laser radiation. We observed a strong product channel selectivity resulting from exciting different vibrational levels in the $^{1}B_{2}$ state. The S($^{3}P_{2}$) product is strongly favoured over all other possible products for $K=0$ levels, whereas a more democratic product distribution is observed for $K=1$ levels. Although this selectivity is general for the $^{1}B_{2}$ state, it gets stronger for lower vibrational levels

Temperament Similarities and Differences: A Comparison of Factor Structures from the Behavioral Style Questionnaire in Children with and Without Autism Spectrum Disorder

The majority of studies of temperament in children with autism spectrum disorder (ASD) use scales normed on typical populations. The present study examined a widely used measure of temperament, the Behavioral Style Questionnaire (McDevitt and Carey in Behavioral Styles Questionnaire, Behavioral-Developmental Initiatives Scottsdale, AZ, 1975) to determine whether it contains the temperament traits theorized by its creators. Neither confirmatory nor exploratory factor analysis, using a sample of children with ASD and a population comparison group, identified the theorized nine temperament factors; many items did not strongly load on any of the original factors. A 10 factor solution best described the ASD data and a 9 factor solution best described the typical group’s data. There were substantial similarities in the 9 factor solutions, but groups differed from one another enough to question construct similarity for several factors. These results highlight that more basic psychometric research is needed to better understand the BSQ in children with ASD