37,130 research outputs found

    Superconductivity and Phase Diagram in (Li0.8_{0.8}Fe0.2_{0.2})OHFeSe1x_{1-x}Sx_x

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    A series of (Li0.8_{0.8}Fe0.2_{0.2})OHFeSe1x_{1-x}Sx_x (0 \leq x \leq 1) samples were successfully synthesized via hydrothermal reaction method and the phase diagram is established. Magnetic susceptibility suggests that an antiferromagnetism arising from (Li0.8_{0.8}Fe0.2_{0.2})OH layers coexists with superconductivity, and the antiferromagnetic transition temperature nearly remains constant for various S doping levels. In addition, the lattice parameters of the both a and c axes decrease and the superconducting transition temperature Tc_c is gradually suppressed with the substitution of S for Se, and eventually superconductivity vanishes at xx = 0.90. The decrease of Tc_c could be attributed to the effect of chemical pressure induced by the smaller ionic size of S relative to that of Se, being consistent with the effect of hydrostatic pressure on (Li0.8_{0.8}Fe0.2_{0.2})OHFeSe. But the detailed investigation on the relationships between TcT_{\rm c} and the crystallographic facts suggests a very different dependence of TcT_{\rm c} on anion height from the Fe2 layer or ChCh-Fe2-ChCh angle from those in FeAs-based superconductors.Comment: 6 pages, 6 figure

    WeChat Adoption among Older Adults and Urban-Rural Differences in China

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    At the intersection of social digitization and population aging, the challenge of older adults fitting into digital life is becoming more prominent. To understand how to help older adults adopt digital life, this study builds upon the Technology Acceptance Model (TAM) and developed the Digital Technology Motivation Interaction Model (DTMIM) to study the complex effects of autonomous motivation (perceived usefulness, perceived ease of use, perceived enjoyment), controlled motivation, and digital feedback on WeChat adoption among older adults, as well as the urban-rural differences. The results of the questionnaire survey and Fuzzy-set Qualitative Comparative Analysis (fsQCA) show that: First, no single construct is a necessary condition for a high (non-high) attitude toward using (ATU) or high (non-high) actual using (AU). Second, we identified two configurations that trigger high ATU including the autonomy-motivation type and digital feedback under motivational synergy, and three configurations that enable high AU including motivational synergy type, digital feedback under autonomous extrinsic motivation, and digital feedback under motivational synergy. Third, the configurations of high ATU and high AU show significant differences between urban and rural areas. Autonomy motivation plays a universal role in urban older adults’ WeChat adoption, while digital feedback is critical for rural older adults. The configuration analysis of DTMIM and urban-rural differences is not only an adaptive improvement of TAM but also provides new methods and perspectives for future research on the adoption of digital technology

    Transmutation prospect of long-lived nuclear waste induced by high-charge electron beam from laser plasma accelerator

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    Photo-transmutation of long-lived nuclear waste induced by high-charge relativistic electron beam (e-beam) from laser plasma accelerator is demonstrated. Collimated relativistic e-beam with a high charge of approximately 100 nC is produced from high-intensity laser interaction with near-critical-density (NCD) plasma. Such e-beam impinges on a high-Z convertor and then radiates energetic bremsstrahlung photons with flux approaching 10^{11} per laser shot. Taking long-lived radionuclide ^{126}Sn as an example, the resulting transmutation reaction yield is the order of 10^{9} per laser shot, which is two orders of magnitude higher than obtained from previous studies. It is found that at lower densities, tightly focused laser irradiating relatively longer NCD plasmas can effectively enhance the transmutation efficiency. Furthermore, the photo-transmutation is generalized by considering mixed-nuclide waste samples, which suggests that the laser-accelerated high-charge e-beam could be an efficient tool to transmute long-lived nuclear waste.Comment: 13 pages, 8 figures, it has been submitted to Physics of Plasm

    On the implementation of accessible transport system in urban villages: a case study of Shenzhen Futian district

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    Urban village is a type of living space in rapid urbanized area within P. R. China, the main spatial features of which are highly the assembling buildings and the principal dwelling space for transient population and poor foreigners. Considering the fact that these urban villages may stay for long time, the implementation of accessible transportation may help reduce social exclusion issues. The major difficulties to implement the Accessible Transport System (ATS) there lie in the exceedingly compacted internal and external spaces. By analyzing the “barrier” and “favorable” aspects of urban villages to the ATS, this study proposes a 'full realization approach' and a 'partial realization approach' in the external and internal spaces of the urban villages. Through in-depth case study of Futian district in Shenzhen, the effectiveness of these approaches will be verified, and the key technical aspects of following research proposals be put forward.postprintThe 12th International Conference on Mobility and Transport for Elderly and Disabled Persons (TRANSED 2010), Hong Kong, China, 2-4 June 2010
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