Numerical thermal diffusivity fields of GnP/Epoxy nanocomposite specimens produced as part of a 3-year PhD research programme at the School of Materials, University of Manchester and funded by the President’s Doctoral Scholar (PDS) Awards scheme.
Raw data of the fields to support the submission of the work "Transient conduction for thermal diffusivity simulation of a graphene/polymer and its full-field validation with image reconstruction" in the Journal of "Composite Structures".
Contributors:Maciej Spiegel, Karina Kapusta, Wojciech Kolodziejczyk, Beata Zbikowska, Glake A. Hill, Zbigniew Sroka
Phenolic acids are naturally occurring compounds that are known for their antioxidant and antiradical activity. This study was conducted in order to investigate the antioxidant potential of the set of 22 phenolic acids with different model of hydroxylation and methoxylation of aromatic ring both experimentally and theoretically. Ferric reducing antioxidant power assay was used for evaluating this property. 2,3-dihydroxybenzoic acid was found to be the strongest antioxidant, while mono hydroxylated and methoxylated structures had the lowest activities. A comprehensive structure-activity investigation with density functional theory methods elucidated the influence of compounds’ topology, resonance stabilization and intramolecular hydrogen bonding on the exhibited activity. The key factor was found to be a presence of two or more hydroxyl groups being located in ortho or para position to each other. Finally, the quantitative structure-activity relationship approach was used to build a multiple linear regression model describing the dependence of antioxidant activity on structure of compound, using purely features related to their topology. Coefficient of determination for training set was 0.9918 and the one for the test set 0.9993, with Q2 value for leave-one-out 0.9716. This model was used to predict activities of phenolic acids that haven’t been tested here experimentally.
This study aimed to investigate the relationships between job crafting, psychological need satisfaction/frustration, thriving, and job insecurity of academics in higher education institutions. A survey with a convenience sample of 276 academic staff at three higher education institutions in South Africa was used. The participants completed the Job Crafting Scale, Basic Psychological Need Satisfaction and Frustration Scale, High-Performance Human Resource Practices Questionnaire, and Thriving at Work Scale.
Contributors:Fedor Lisetskii, Vladimir Stolba, Arseniy Poletaev
Sampling ash deposits (A) and soils formed on ash (S) in the south of the East European Plain was carried out in each of the soil-stratigraphic sections at archaeological sites of different ages (Fig. S1). Stratigraphic columns with ash deposits and soils formed on them are presented in supplementary materials (Fig. S2–S4). Location of research objects (ash soil and ash deposits) within the continental forest-steppe, Belgorod Oblast (A) and within the Plain (steppe) and Piedmont (forest-steppe) Crimea (B). Archaeological sites: Borisovka, mid-5th c. (1); Chernomorskoe, Bronze Age and Early Iron Age settlement (2); Kunan, 2nd c. BC (3); Airchi, 2nd c. BC – 1st c. AD (4); Kalos Limen, 1st c. BC – 1st c. AD (5); Former village of Saya, before 1944 (6); Former village of Oirat, before 1944 (7); Borut-Khane, 1st c. BC – 1st c. AD (8); Ak-Kaya, 350–325 AD (9); Zayachye, 3rd – 2nd c. AD (10); Kermen-Kyr, 3rd – 2nd c. AD (11). Stratigraphic columns with ash deposits and soils formed at archaeological sites of different ages.
The data consist of an application, namely PyFEST, written in Python language, and a file with instructions to install and use the application. It can be used to estimate the frequencies of short-time signals with high accuracy. Along with the application, examples with generated signal (single-ton, multi-tone, noisy, damped etc.) and measured signals are delivered for testing purposes.
The frequencies of the harmonic components are evaluated one-by-one with high accuracy. Because the actions performed do not imply previous expertise, the results are not influenced by human intervention.
The presence of stroke is being observed in young adults (under 50 years of age) without cardiovascular risk factors suffering from COVID-19. It is speculated whether there is really a significant increase, as few cases have yet been described, or whether the infection actually favors their development. Cerebrovascular events were more common in older patients with stroke risk factors such as hypertension and diabetes mellitus, and those who had elevated fibrin D-dimers. Multiple cases reports and series about cerebrovascular disease in COVID-19 has been informed. The mechanism that causes cerebral ischemia in COVID-19 remains undiscovered, however, progressively there is increasing evidence of a hypercoagulable state that could be or contribute to the cause of cerebrovascular disease. We review the current literature about cerebrovascular disease, both epidemiology and etiology. More studies are needed to understand COVID-19 neuropathogenesis and the presence of stroke in this patient.