Magnetic structures of Mn3-xFexSn2: an experimental and theoretical study

We investigate the magnetic structure of Mn3-xFexSn2 using neutron powder diffraction experiments and electronic structure calculations. These alloys crystallize in the orthorhombic Ni3Sn2 type of structure (Pnma) and comprise two inequivalent sites for the transition metal atoms (4c and 8d) and two Sn sites (4c and 4c). The neutron data show that the substituting Fe atoms predominantly occupy the 4c transition metal site and carry a lower magnetic moment than Mn atoms. Four kinds of magnetic structures are encountered as a function of temperature and composition: two simple ferromagnetic structures (with the magnetic moments pointing along the b or c axis) and two canted ferromagnetic arrangements (with the ferromagnetic component pointing along the b or c axis). Electronic structure calculations results agree well with the low-temperature experimental magnetic moments and canting angles throughout the series. Comparisons between collinear and non-collinear computations show that the canted state is stabilized by a band mechanism through the opening of a hybridization gap. Synchrotron powder diffraction experiments on Mn3Sn2 reveal a weak monoclinic distortion at low temperature (90.08 deg at 175 K). This lowering of symmetry could explain the stabilization of the c-axis canted ferromagnetic structure, which mixes two orthorhombic magnetic space groups, a circumstance that would otherwise require unusually large high-order terms in the spin Hamiltonian.Comment: 11 pages, 13 figure

END-USER CENTRED PARTICIPATORY DESIGN FOR COMMUNITY–BASED HEALTHCARE ENVIRONMENTS IN CHINA

The national healthcare system in China is currently experiencing significant reform, which aims to establish a more accessible, affordable and equitable healthcare service for the whole society. One of the long-term key tasks is set to transform the allocation of medical resources in urban areas from a “centralised” pattern to a “decentralised” one. It intends to improve the capacity of delivering primary care for urban residents. In this research, attention is paid to the social sustainability and design process of healthcare environments at a community level, since the design quality has a significant impact upon the provision and delivery of healthcare service while there is a lack of specific building regulations or standards that are tailored to inform or assess the design of community-based healthcare facilities in China. This research explores end-users’ satisfaction and the design strategies related to their needs. A “multi-strategy research” strategy is applied for the research framework, which consists of desktop research and field investigations. In the desktop research, the design strategies for healthcare environments are collected with relevant evidence from regulations and previous literature. A series of social studies are conducted for the field investigations, and finally, the responses of target groups in this research are cross-compared and analysed in order to shed an in-depth insight into end-users’ cognitive differences. Their preferences are used to identify the relative importance of design strategies that are related to end-users’ needs for community-based healthcare environments. It is found that a complete consensus on the needs of end-users cannot be reached for good healthcare environment design at a community level. Evidence-based design principles can improve the efficiency of knowledge exchange in the participatory design decision-making process. Information from building regulations is expected to be used as a communication platform for stakeholders with different knowledge levels. Based on the findings regarding end-users’ preferences for the design of community-based healthcare environments, the suggestions on improving the existing building regulations from a social perspective are raised. Furthermore, a design aided tool, End-user Centred Participatory Design for Community-based Healthcare Environments Version 1.0 (ECPD), is proposed, which can be employed in conjunction with GB/T 51153 currently, in order to improve the overall design quality and social sustainability of community-based healthcare environments in China

Properties of potential eco-friendly gas replacements for particle detectors in high-energy physics

Gas detectors for elementary particles require F-based gases for optimal performance. Recent regulations demand the use of environmentally unfriendly F-based gases to be limited or banned. This work studies properties of potential eco-friendly gas replacements by computing the physical and chemical parameters relevant for use as detector media, and suggests candidates to be considered for experimental investigation

Data taking strategy for the phase study in ψ′→K+K−\psi^{\prime} \to K^+K^-

The study of the relative phase between strong and electromagnetic amplitudes is of great importance for understanding the dynamics of charmonium decays. The information of the phase can be obtained model-independently by fitting the scan data of some special decay channels, one of which is $\psi^{\prime} \to K^{+}K^{-}$. To find out the optimal data taking strategy for a scan experiment in the measurement of the phase in $\psi^{\prime} \to K^{+} K^{-}$, the minimization process is analyzed from a theoretical point of view. The result indicates that for one parameter fit, only one data taking point in the vicinity of a resonance peak is sufficient to acquire the optimal precision. Numerical results are obtained by fitting simulated scan data. Besides the results related to the relative phase between strong and electromagnetic amplitudes, the method is extended to analyze the fits of other resonant parameters, such as the mass and the total decay width of $\psi^{\prime}$.Comment: 13 pages, 7 figure

Properties of potential eco-friendly gas replacements for particle detectors in high-energy physics

Modern gas detectors for detection of particles require F-based gases for optimal performance. Recent regulations demand the use of environmentally unfriendly F-based gases to be limited or banned. This review studies properties of potential eco-friendly gas candidate replacements.Comment: 38 pages, 9 figures, 8 tables. To be submitted to Journal of Instrumentatio

Candidate eco-friendly gas mixtures for MPGDs

Modern gas detectors for detection of particles require F-based gases for optimal performance.Recent regulations demand the use of environmentally unfriendly F-based gases t o be limited or banned. This review studies properties of potential eco-friendly gas candidate replacements

Splicing factor Rbm10 facilitates heterochromatin assembly in fission yeast

Splicing factors have recently been shown to be involved in heterochromatin formation, but their role in controlling heterochromatin structure and function remains poorly understood. In this study, we identified a fission yeast homologue of human splicing factor RBM10, which has been linked to TARP syndrome. Overexpression of Rbm10 in fission yeast leads to strong global intron retention. Rbm10 also interacts with splicing factors in a pattern resembling that of human RBM10, suggesting that the function of Rbm10 as a splicing regulator is conserved. Surprisingly, our deep-sequencing data showed that deletion of Rbm10 caused only minor effect on genome-wide gene expression and splicing. However, the mutant displays severe heterochromatin defects. Further analyses confirmed that the heterochromatin defects in the mutant did not result from mis-splicing of heterochromatin factors. Our proteomic data revealed that Rbm10 associates with the histone deacetylase Clr6 complex and chromatin remodeling complexes known to be essential for heterochromatin silencing. Our work together with previous findings further suggests that different splicing subunits may play distinct roles in heterochromatin regulation