Rational design of natural leather-based water evaporator for electricity generation and functional applications

In recent years,water evaporation-induced electricity has attracted a great deal of attention as an emerging green and renewable energy harvesting technology.Although abundant materials have been developed to fabricate hydrovoltaic devices,the limitations of high costs,inconvenient storage and transport,low environmental benefits,and unadaptable shape have restricted their wide applications.Here,an electricity generator driven by water evaporation has been engineered based on natural biomass leather with inherent properties of good moisture permeability,excellent wettability,physicochemical stability,flexibility,and biocompatibility.Including numerous nano/microchannels together with rich oxygen-bearing functional groups,the natural leather-based water evaporator,Leather_(Emblic-NPs-SA/CB),could continuously produce electricity even staying outside,achieving a maximum output voltage of∼3 V with six-series connection.Furthermore,the leather-based water evaporator has enormous potential for use as a flexible self-powered electronic floor and seawater demineralizer due to its sensitive pressure sensing ability as well as its excellent photothermal conversion efficiency(96.3%)and thus fast water evaporation rate(2.65 kg m^(−2)h^(−1)).This work offers a new and functional material for the construction of hydrovoltaic devices to harvest the sustained green energy from water evaporation in arbitrary ambient environments,which shows great promise in their widespread applications.

Seismic detection of the X-discontinuity beneath the Ryukyu subduction zone from the SdP conversion phase

The X-discontinuity,which appears at the depth of approximately 300 km,is an important seismic interface with positive velocity contrasts in the upper mantle.Detecting its presence and topography can be useful to understand phase transformations of relevant mantle minerals under the high-temperature and high-pressure circumstance of the Earth's interior.In this study,we detect the X-discontinuity beneath the Ryukyu subduction zone using five intermediate-depth events recorded by the dense Alaska Regional Network(AK).The X-discontinuity is successfully revealed from the robust slant stacking of the secondary down-going and converting Sd P phases.From the depth distribution of conversion points,we find that the X-discontinuity's depth ranges between 269 km and 313 km,with an average depth of 295 km.All the conversion points are located beneath the down-dipping side of the Philippine Sea slab.From energy comparisons in vespagrams for observed and synthetic seismograms,the strong converted energy is more likely from a thin high-velocity layer,and the S-wave velocity jumps across the X-discontinuity are up to 5% to 8% with an average of 6.0%.According to previous petrological and seismological studies,the X-discontinuity we detected can be interpreted as the phase transformation of coesite to stishovite in eclogitic materials within the oceanic crust.

Ni doping effects in YBa_2Fe_3O_(8+w)

By doping Ni into YBa2Fe308＋w （YBFO） system, we obtained the phase YBa2Fe3-xNixO8＋w （YBFNO, x=0, 0.05, 0.10, 0.15, 0.30, 0.50, 1.00）. This paper discusses the changes in crystal structural, resistivity and magnetoresistivity （MR） of YBFO samples due to the incorporation of transition metal Ni. The results show that Ni substitution for partial Fe in YBFO does not substantially transform the structure of parent phase, but results in tiny changes in the lat- tice parameters. The YBFO crystal with Ni doped is semiconducting.

乡村教师何以“留得住、教得好、有发展”?人力资源双重关注模型的跨层次效应研究

教育振兴是乡村振兴的基石,而乡村教师的发展则是教育振兴的关键。因此,如何打造“留得住、教得好、有发展”的高素质乡村教师队伍已经成为了目前的核心管理议题。然而,少有实证研究从组织层面探究人力资源管理系统对乡村教师工作结果和职业生涯的影响。基于资源保存理论,本文探讨了人力资源双重关注模型对乡村教师离职意向、工作绩效和职业成长的影响以及工作繁荣的中介作用。通过对51所学校和690位乡村教师的匹配数据进行跨层结构方程模型分析,研究发现:维持导向人力资源实践对乡村教师的离职意向有显著负向影响、对工作绩效有显著正向影响,对职业成长的影响不显著;绩效导向人力资源实践对乡村教师离职意向有显著负向影响、对工作绩效和职业成长均有显著正向影响;工作繁荣在人力资源双重关注模型与离职意向和工作绩效之间发挥着中介作用,工作繁荣在人力资源双重关注模型与职业成长之间没有发挥中介作用。本研究结果有助于优化乡村教师队伍的管理路径,激发乡村教师专业发展的内源性动力,完善乡村学校的人才培养模式。