摘要：本文报道了一台结合电喷雾离子源和双反射飞行时间质谱的速度成像光电子能谱仪的研制过程,其可用于开展溶液中负离子的光电子能谱研究.在该装置中,电喷雾离子源产生的负离子由四极杆组成的离子引导系统传输至冷离子阱,并对负离子进行富集和冷却,用于后端的质量选择和光电子能谱探测.该装置的关键技术之一是将双反射质量分析器与Wiley-McLaren离子加速聚焦设计进行了串联:这样可以有效地提高质谱分辨,从而准确地选择目标离子,其质量分辨率(M/△M)可达2000以上.该装置的高分辨光电子速度成像系统采用多极电子透镜设计,对于动能为0.59eV的光电子,其能谱峰的半高宽约为5.8meV,相对分辨率为~0.98%本文对该装置的工作原理,结构设计和性能测试情况进行了详细阐述。

摘要：非质子锂氧电池基于锂金属与氧的可逆反应生成Li_(2)O_(2),可提供极高的理论能量密度.然而,Li_(2)O_(2)的成核/消除机制仍然不清楚.因此,构建能在原子水平上深入了解催化机理的催化剂体系,是开发高性能锂氧电池的关键.在此,我们报道了一种在富氧空位的Co_(3)O_(4)(Pd1-Co_(3)O_(4x))中实现Pd单原子选择性锚定的策略.原子水平表征技术揭示了Pd原子优先地结合到缺陷Co_(3)O_(4)的四面体位点.理论计算表明,选择性锚定的Pd单原子与氧空位的耦合引起了明显的电荷重分布,这可以有效地提高Pd 4d轨道在费米能级附近的能带占用率,促进电子转移,有利于中间体的吸附.这种双重相互作用不仅可以调节放电过程中Li_(2)O_(2)的成核生长过程,而且有利于Li_(2)O_(2)上的电子云的离域,减弱Li-O键的强度,从而促进Li_(2)O_(2)在充电过程中的分解.本研究对锂氧电池在原子水平上的催化机理和高效催化剂的合理设计提出了一些见解.

摘要：Monitoring the electrophysiology activity of neurons and blood calcium signals can enable a better understanding of disease-related neural system ***,currently,in situ calcium ion monitoring tools are scarce and exhibit low integration and limited *** this letter,we propose an implantable probe with an integrated in situ Ag/AgCl reference electrode(ISA/ARE)that can monitor action potential(AP)and Ca^(2+) concentrations.

摘要：Large cutaneous wounds pose a severe medical problem and may be deadly in cases when regeneration is ***,topical stem cell therapy has been realized as a promising strategy for wound healing and skin ***,stem cells must be administrated uniformly to the wound area,otherwise treatment will be ineffective,which has been a limitation of current administration ***,the delivery pressure and nozzle features of most clinical cell spray devices are unknown,which may significantly affect the viability of sprayed cells and their capacity for ***,we developed a novel pneumatically assisted atomization device(PAAD)in which cell suspensions were uniformly atomized at a low delivery *** optimized the applied fluidic pressure and air pressure to maximize cell survival and function for the application of multiple cell types,while ensuring uniform dispersal across the wound ***,we found that the application of sprayed umbilical cord-derived mesenchymal stem cells to wound sites significantly accelerated wound healing and promoted appendage regeneration on an excisional cutaneous wound ***,the novel PAAD system delivered living cells uniformly and maintained the viability and differentiation of sprayed cells,strongly suggesting its potential for application in clinical cell therapy,especially for large,irregular,and severe skin wounds.

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：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：Effective electrocatalysis is crucial for enhancing the efficiency of water splitting to obtain clean ***,we report a system of interesting and high-performance Sr-doped perovskite electrocatalysts with porous structures,obtained via a facile molten salt method and applied in the oxygen evolution reaction(OER).With increasing the Sr content,the valence states of Co and Fe ions do not clearly increase,according to the Co-L2,3 and Fe-L2,3 as well as the Co-K and the Fe-K X-ray absorption spectroscopy,whereas doped holes are clearly observed in the 0-K ***-resolution transmission electron microscopy indicates the appearance of an amorphous layer after the electrochemical *** conclude that the formation of the amorphous layer at the surface,induced by Sr doping,is crucial for achieving high OER activity,and we offer insights into the self-reconstruction of the OER catalyst.

摘要：The formations of desiccation cracks and their pattems in drying droplets of protein solutions are studied experimentally. The solvent evaporation causes the dehydration self-organization phenomenon in colloidal droplets, followed by the formations of desiccation cracks. Two categories of highly ordered crack patterns, which we name ＂daisy＂ and ＂wavy-ring＂, are identified in the drying droplets. We explore the shifting of crack patterns from the ＂daisy＂ to the ＂wavy-ring＂ by varying the concentration of protein droplets. The results show that the concentration correlates with the pattern of deposition film directly, and modulates the periodicity of the crack pattern. We investigate the formations and periodicities of these two kinds of crack patterns, and obtain the scaling law of periodicity of the ＂wavy-ring＂ crack pattern. The relationship between the deposition pattern and the highly ordered crack patterns is also examined. This study will help in understanding the formation mechanisms of crack patterns in drying droplets of protein solutions and assist the future design of crack patterns in practical applications.

摘要：The design and synthesis of highly active non-noble metal oxide catalysts, such as transition- and rare-earth-metal oxides, have attracted significant attention because of their high efficiency and low cost and the resultant potential applications for the degradation of volatile organic compounds(VOCs). The structure-activity relationships have been well-studied and used to facilitate design of the structure and composition of highly active catalysts. Recently, non-noble metal oxides with porous structures have been used as catalysts for deep oxidation of VOCs, such as aromatic hydrocarbons, aliphatic compounds, aldehydes, and alcohols, with comparable activities to their noble metal counterparts. This review summarizes the growing literature regarding the use of porous metal oxides for the catalytic removal of VOCs, with emphasis on design of the composition and structure and typical synthetic technologies.

摘要：This paper presents a neutronics design of a 10 MW ordered-pebble-bed fluoride-salt-cooled high-temperature experimental reactor. Through delicate layout, a core with ordered arranged pebble bed can be formed,which can keep core stability and meet the space requirements for thermal hydraulics and neutronics ***, objectives of the core include inherent safety and sufficient excess reactivity providing 120 effective full power days for experiments. Considering the requirements above, the reactive control system is designed to consist of 16 control rods distributed in the graphite reflector. Combining the large control rods worth about 18000–20000 pcm, molten salt drain supplementary means(-6980 to -3651 pcm) and negative temperature coefficient(-6.32 to -3.80 pcm/K) feedback of the whole core, the reactor can realize sufficient shutdown margin and safety under steady state. Besides, some main physical properties, such as reactivity control, neutron spectrum and flux, power density distribution, and reactivity coefficient,have been calculated and analyzed in this study. In addition, some special problems in molten salt coolant are also considered, including ~6Li depletion and tritium production.