University of Saskatchewan

About: University of Saskatchewan is a education organization based out in Saskatoon, Saskatchewan, Canada. It is known for research contribution in the topics: Population & Health care. The organization has 25021 authors who have published 52579 publications receiving 1483049 citations. The organization is also known as: USask.

Towards exotic hidden-charm pentaquarks in QCD

Abstract: Inspired by P(c)(4380) and P(c)(4450) recently observed by LHCb, a QCD sum rule investigation is performed, by which they can be identified as exotic hidden-charm pentaquarks composed of an anticharmed meson and a charmed baryon. Our results suggest that P(c)(4380) and P(c)(4450) have quantum numbers J(P)=3/2(-) and 5/2(+), respectively. Furthermore, two extra hidden-charm pentaqurks with configurations DΣ(c)(*) and D(*)Σ(c)(*) are predicted, which have spin-parity quantum numbers J(P)=3/2(-) and J(P)=5/2(+), respectively. As an important extension, the mass predictions of hidden-bottom pentaquarks are also given. Searches for these partners of P(c)(4380) and P(c)(4450) are especially accessible at future experiments like LHCb and BelleII.

Validation of the chronic pain acceptance questionnaire (CPAQ) in an Internet sample and development and preliminary validation of the CPAQ-8.

Abstract: This study investigated the psychometric properties of the Chronic Pain Acceptance Questionnaire (CPAQ) in a mixed chronic pain, Internet sample and sought to develop a valid and reliable short form. Questionnaires were completed by 428 respondents, comprising a sample accessed via the Internet (n = 319) and a sample who completed a paper and pencil version of the measures (n = 109). Using confirmatory factor analysis (CFA) the two-factor structure of the CPAQ in the Internet sample was supported, though a good model fit was only achieved following the removal of one item. The resultant 19 item CPAQ demonstrated good reliability and evidence of validity was obtained for this sample. Data from the Internet sample were used to derive an eight-item short form. The two four-item factors (activity engagement [AE] and pain willingness [PW]) were confirmed using CFA and found to be invariant across both samples with good scale reliability. Higher CPAQ-8 and subscale scores were correlated with less depression and anxiety, pain severity and pain interference, and fewer medical visits for pain. Using structural equation modelling both subscales were found to partially mediate the impact of pain severity on pain interference and emotional distress. In this model AE had stronger associations with outcomes while PW accounted for a small portion of the variance in pain interference and anxiety, but not depression. This study confirmed the two-factor structure of the CPAQ in a mixed chronic pain Internet sample and provides preliminary evidence for the psychometric soundness of the CPAQ-8.

Thermal cracking of canola oil: reaction products in the presence and absence of steam

Abstract: The product distribution obtained from the thermal cracking of canola oil was studied at atmospheric pressure in a fixed-bed reactor in the temperature range 300−500 °C and gas hourly space velocity (GHSV) in the range 3.3−640 h-1 over inert materials and in the presence and absence of steam. Results showed that canola oil conversions were high (54−100 wt %) and depended strongly on the operating variables. Products essentially consisted of C4 and C5 hydrocarbons, aromatic and C6+ aliphatic hydrocarbons, and C2-C4 olefins, as well as a diesel-like fuel fraction and hydrogen. GC−MS analyses showed that product distribution as well as the lengths of the carbon chain of hydrocarbons and oxygenated hydrocarbons depended strongly not only on the cracking temperature and space velocity but also on whether cracking was conducted in the presence or absence of steam. On the other hand, cracking over inert materials showed that both conversion and product distribution were completely independent of morphology of th...