摘要：The process of wound healing is routinely evaluated by histological evaluation in the clinic,which may cause scarring and secondary *** confocal microscopy(RCM)represents a noninvasive,real-time imaging technique that allows in vivo evaluation of the *** RCM was wide-probe-based,which limited its application on uneven and covered *** this study,we report the development of a portable reflectance confocal microscope(PRCM)in which all components were assembled in a handheld *** the size and weight of the PRCM were reduced based on the use of a microelectromechanical system,the resolution was kept at 0.91μm,and the field of view of the system was 343μm×532μ*** used in vivo,the PRCM was able to visualize cellular and nuclear morphology for both mouse and human *** evaluations were then performed on wounds after topically applied mesenchymal stem cells(MSCs)or saline *** PRCM allowed visualization of the formation of collagen bundles,re-epithelization from the wound edge to the wound bed,and hair follicle regeneration,which were consistent with histological ***,we offer new insights into monitoring the effects of topically applied MSCs on the process of wound healing by using *** study illustrates that the newly developed PRCM represents a promising device for real-time,noninvasive monitoring of the dynamic process of wound healing,which demonstrates its potential to diagnose,monitor,or predict disease in clinical wound therapy.

摘要：Using an optical vortex coronagraph （OVC） is one of the most promising techniques for di- rectly imaging exoplanets because of its small inner working angle and high throughput. This paper presents the design and laboratory demonstration performance of an OVC based on liquid crystal polymers （LCPs） at 633 nm and 1520 nm. The OVC can deliver good performance in laboratory tests and achieve a contrast of 10-6 at an angular distance of 3A/D, which can be implemented for imaging young giant exoplanets in combination with extreme adaptive optics.

摘要：Water-based rechargeable metal-air batteries play an important role in the storage and conversion of renewable electric ***,the sluggish kinetics of the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)have limited the practical application of rechargeable metal-air *** of reviews were focused on single functional electrocatalysts while few on bifunctional *** is indispensable but challenging to design a bifunctional electrocatalyst that is active and stable to the two ***,attempts to develop high active bifunctional electrocatalysts for both ORR and OER increase *** work is focused on the micro-nano design of advanced structures to improve the performance of bifunctional ***-metal materials,carbon materials and composite materials,and the methods developed to prepare micro-nano structures,such as electrochemical methods,chemical vapor deposition,hydrothermal methods and template methods are reported in ***,many strategies,such as adjustments of electronic structures,oxygen defects,metal-oxygen bonds,interfacial strain,nano composites,heteroatom doping etc.,have been used extensively to design bifunctional *** well understand the achievements in the recent literatures,this review focuses on the micro-nano structural design of materials,and the related methods and strategies are classed into two groups for the improvement of intrinsic and apparent *** fine adjustment of nano structures and an in-depth understanding of the reaction mechanism are also discussed briefly.

摘要：封装是光电子器件的关键技术之一。同时,器件的封装还影响器件的性能。文章提出了一种基于波长滞后的方法来评估激光器在298 K至10 K环境温度范围内的热阻。通过计算降温和升温过程中波长滞后的程度来表征热阻大小。该方法解决了低温环境中无法评估激光器散热性能的问题。这对低温光互连具有重要意义,也为低温环境中激光器的封装设计提供了参考。

摘要：5G baseband signal processing places greater real-time and reliability requirements on *** on the architecture of the MaPU,a reconfigurable computing architecture is proposed according to the characteristics of the 5G baseband signal processing.A dedicated instruction set for 5G baseband signal processing is *** corresponding functional units are designed for reuse of hardware resources.A redirected register file is proposed to address latency and power consumption issues in internetwork.A two-dimensional code compression scheme is proposed for cases in which the use ratio of instruction memory is *** access mode of the data memory is extended,the performance is improved and the power consumption is *** throughput of 5G baseband processing algorithm is one to two orders of magnitude higher than that of the TMS320C6670 with less power *** silicon area evaluated by layout is 5.8 mm2,which is 1/6 of the MaPU’*** average power consumption is 0.7 W,which is 1/5 of the MaPU’s.

摘要：Hybrid transition-metal dichalcogenides （TMDs） with different chalcogens on each side （X-TM-Y） have attracted attention because of their unique properties. Nanotubes based on hybrid TMD materials have advantages in flexibility over conventional TMD nanotubes. Here we predict the wide band gap tunability of hybrid TMD double-wall nanotubes （DWNTs） from metal to semiconductor. Using density-function theory （DFT） with HSE06 hybrid functional, we find that the electronic property of X-Mo-Y DWNTs （X = O and S, inside a tube; Y = S and Se, outside a tube） depends both on electronegativity difference and diameter difference. If there is no difference in electron negativity between inner atoms （X） of outer tube and outer atoms （Y） of inner tube, the band gap of DWNTs is the same as that of the inner one. If there is a significant electronegativity difference, the electronic property of the DWNTs ranges from metallic to semiconducting, depending on the diameter differences. Our results provide alternative ways for the band gap engineering of TMD nanotubes.

摘要：Polarimetry plays an important role in the measurement of solar magnetic fields. We devel- oped a high-sensitivity and high-accuracy polarimeter （HHP） based on nematic liquid crystal variable retarders （LCVRs）, which has a compact setup and no mechanical moving parts. The system design and calibration methods are discussed in detail. The azimuth error of the transmission axis of the polarizer as well as the fast axes of the two LCVRs and the quarter-wave plate were determined using dedicated procedures. Linearly and circularly polarized light were employed to evaluate the performance of the HHP. The experimental results indicate that a polarimetric sensitivity of better than 5.7 × 10-3 can be achieved by using a single short-exposure image, while an accuracy on the order of 10-5 can be reached by using a large number of short-exposure images. This makes the HHP a high-performance system that can be used with a ground-based solar telescope for high-precision solar magnetic field investigations.

摘要：To design novel phenanthroline-derived soft ligands for selectively separating minor actinides from lanthanides, four tetradentate phenanthroline-derived heterocyclic ligands(BTPhen, BPyPhen, BPzPhen, and BBizPhen) were constructed and their complexation behaviors with Am(ⅡI) and Eu(ⅡI) were systematically investigated by density functional theory(DFT) coupled with relativistic small-core pseudopotential. In all the 1:1-type species, the metal ion is in the center of the cavity and coordinates with two nitrogen atoms(N1 and N1′) of the phenanthroline skeleton and the other two nitrogen atoms(N2 and N2′) of the auxiliary groups. The bond lengths of Am–N are comparable to or even shorter than those of Eu–N bonds because the ionic radii of Am(ⅡI) are larger than those of Eu(ⅡI). Additionally, the negative ΔΔGAm/Eu value for the reaction of [M(H2O)4-(NO3)3] + L → ML(NO3)3 + 4H2 O indicates that the complexation reaction of Am(ⅡI) is more energetically favorable than that of Eu(ⅡI); this can be considered as an important design criterion to screen phenanthroline-derived ligands for MA(ⅡI) extraction. According to this criterion, the selectivity of tetradentate phenanthroline-derived ligands for separating Am(ⅡI) over Eu(ⅡI) follows the order of BTPhen > BBizPhen > BPyPhen > BPzPhen.

摘要：This study investigates the projected changes in the East Asian westerly jet(EAJ)under six global warming targets(1.5℃,2.0℃,2.5℃,3.0℃,3.5℃,and 4.0℃)relative to the present climate,using the outputs of CMIP5 *** results show that the westerly tends to weaken slightly under the 1.5℃warming *** the 2.0℃target,it is projected to intensify south of the EAJ’s axis(approximately 40°N)and decay north of the *** change becomes increasingly evident under the 2.5℃and higher warming targets,which suggests that the EAJ’s axis will move farther and farther southward,but its intensity will change little with increasing global *** analyses suggest that the change in the EAJ is closely related to the inhomogeneous rising rate of air temperature in the mid–upper *** relatively slow-rising air temperature in the mid–upper troposphere over the EAJ’s entrance and exit regions will lead to a negative(positive)meridional temperature gradient to the south(north),and will then accelerate(decelerate)the westerly on the EAJ’s south/north side.

摘要：The effect of tumor-targeted photodynamic therapy（PDT） was improved by designing nanotheranostics to promote oxygenation in a tumor microenvironment（TME）wherein hypoxia, acidosis, and the elevated levels of H2O2 are three main characteristics. In this study, a carbon dot（CD）PDT agent recently developed by our group was firstly applied as reducing agent to react with potassium permanganate for fabricating CDs/manganese dioxide（CDs/MnO2） composites,which were in turn modified with polyethylene glycol（PEG） to form water-soluble CDs/MnO2-PEG nanohybrids. In a normal physiological environment, the as-prepared nanohybrids exhibited quenched fluorescence, weak singlet oxygen generation, and low magnetic resonance imaging（MRI） ***, given the high sensitivity of MnO2 to the TME, the CDs/MnO2-PEG nanohybrids changed from an ＂off＂ to an＂on＂ state with synchronously enhanced fluorescence, singlet oxygen generation, and MRI signal in the TME. In vitro and in vivo analyses have revealed that CDs/MnO2-PEG nanohybrids could be applied as TME-driven, turn-on nanotheranostics for the MR/fluorescence bimodal imaging-guided PDT of ***, complete clearance of CDs/MnO2-PEG nanohybrids from the body of mice was observed, indicating their low long-term toxicity and good biocompatibility. This work offers a new nanotheranostic candidate for modulating the unfavorable TME, particularly for the targeted PDT of cancer through precise positioning and oxygen generation.