94 research outputs found
Time-resolved Measurement of Quadrupole Wakefields in Corrugated Structures
Corrugated structures have recently been widely used for manipulating
electron beam longitudinal phase space and for producing THz radiation. Here we
report on time-resolved measurements of the quadrupole wakefields in planar
corrugated structures. It is shown that while the time- dependent quadrupole
wakefield produced by a planar corrugated structure causes significant growth
in beam transverse emittance, it can be effectively canceled with a second
corrugated structure with orthogonal orientation. The strengths of the
time-dependent quadrupole wakefields for various corrugated structure gaps are
also measured and found to be in good agreement with theories. Our work should
forward the applications of corrugated structures in many accelerator based
scientific facilities
Rational design of acid stable oxide catalysts for OER with OC22
The efficiency of production via water electrolysis is typically
limited to the sluggish oxygen evolution reaction (OER). As such, significant
emphasis has been placed upon improving the rate of OER through the anode
catalyst. More recently, the Open Catalyst 2022 (OC22) has provided a large
dataset of density functional theory (DFT) calculations for OER intermediates
on the surfaces of oxides. When coupled with state-of-the-art graph neural
network models, total energy predictions can be achieved with a mean absolute
error as low as of 0.22 eV. In this work, we interpolated a database of the
total energy predictions for all slabs and OER surface intermediates for 4,119
oxide materialas in the original OC22 dataset using pre-trained models from the
OC22 framework. This database includes all terminations of all facets up to a
maximum Miller index of 1 with adsorption configurations for and .
To demonstrate the full utility of this database, we constructed a flexible
screening framework to identify viable candidate anode catalysts under a bulk
and nanoscale regime for OER by assessing the price, thermodynamic stability,
and resistance to corrosion, surface stability, and overpotential. Finally we
verified the overpotentials and reaction energies of the final candidate
catalysts using DFT. From our assessment, we were able to identify 48 and 69
viable candidates for OER under the bulk and nanoscale regime respectively
The mediating effect of resilience on mental health literacy and positive coping style among Chinese empty nesters: A cross-sectional study
ObjectivesEmpty nesters in China have limited mental health literacy (MHL), which may lead to poorer health outcomes. Studies demonstrate that MHL is associated with both resilience and positive coping style. However, the potential mechanism of MHL, resilience and positive coping style remain unclear. Therefore, the study aims to investigate the possible mediating role of resilience in the relationship between MHL and positive coping style.MethodIn this cross-sectional study, a total of 363 empty nesters from Huzhou, China were surveyed in 2022. The Chinese version of Mental Health Literacy Scale (C-MHLS), the Chinese version of 10-item Connor-Davidson Resilience Scale (CD-RISC-10) and the Simplified Coping Style Questionnaire (SCSQ-19) were used to assess MHL, resilience, and positive coping style, respectively.ResultsPositive coping style was significantly correlated with MHL and resilience, and MHL was positively correlated with resilience (p < 0.01). MHL can significantly and positively predict the positive coping style, and resilience played a partial intermediary role between MHL and positive coping style, with the intermediary effect of 77.36%.ConclusionThis study indicates that MHL not only directly affected positive coping style, but also indirectly influences positive coping style by increasing the resilience of empty nesters. The results provide an empirical evidence for the development of intervention programs to improve positive coping style directly and indirectly. Consequently, community health servicers should take targeted measures which focus on MHL and resilience as breakthrough points to stimulate positive coping style of empty nesters, and ultimately achieve their overall well-being
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