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Ce3+:Lu3Al5O12-Al2O3 optical nanoceramic scintillators elaborated via a low-temperature glass crystallization route
No full textTransparent Ce:lutetium aluminum garnet (Ce: Lu3Al5O12, Ce:LuAG) ceramics have been regarded as potential scintillator materials due to their relatively high density and atomic number (Z(eff)). However, the current Ce:LuAG ceramics exhibit a light yield much lower than the expected theoretical value due to the inevitable presence of Lu-Al antisite defects at high sintering temperatures. This work demonstrates a low-temperature (1100 degrees C) synthetic strategy for elaborating transparent LuAG-Al2O3 nanoceramics through the crystallization of 72 mol% Al2O3-28 mol% Lu2O3 (ALu28) bulk glass. The biphasic nanostructure composed of LuAG and Al2O3 nanocrystals makes up the whole ceramic materials. Most of Al2O3 is distributed among LuAG grains, and the rest is present inside the LuAG grains. Fully dense biphasic LuAG-Al2O3 nanoceramics are highly transparent from the visible region to mid-infrared (MIR) region, and particularly the transmittance reaches 82% at 780 nm. Moreover, Lu-Al antisite defect-related centers are completely undetectable in X-ray excited luminescence (XEL) spectra of Ce:LuAG-Al2O3 nanoceramics with 0.3-1.0 at% Ce. The light yield of 0.3 at% Ce:LuAG-Al2O3 nanoceramics is estimated to be 20,000 ph/MeV with short 1 mu s shaping time, which is far superior to that of commercial Bi4Ge3O12 (BGO) single crystals. These results show that a low-temperature glass crystallization route provides an alternative approach for eliminating the antisite defects in LuAG-based ceramics, and is promising to produce garnet-based ceramic materials with excellent properties, thereby meeting the demands of advanced scintillation applications
A blade-like CoZn metal organic framework-based flexible quasi-solid Zn-ion battery
No full textWearable flexible electronics has become more and more significant and popular in daily life. Here, a flexible quasi-solid Zn-ion battery consisting of CoZn-metal organic frameworks (MOFs) grown on carbon cloth as an all-in-one cathode working with a hydrogel electrolyte is developed. CoZn MOFs display a blade-like morphology, which is significant for rapid transfer of ions and electrons. The battery bending at angles from 0 degrees to 180 degrees displays high capacities and good capacity retention, and the capacity remains stable as the flexible battery twists to 90 degrees. In addition, the capacity exceeds 101.4 mA h g(-1) as the battery is folded to 180 degrees for 30 times, which indicates that the developed Zn-ion batteries would be applicable for a large variety of wearable devices such as foldable cellphones and pads
Optical tuning and energy transfer of single-phase white-emitting Y3TaO7:Bi3+, Eu3+ for ultraviolet converted pc-WLED with high chromatic stability
No full textReabsorption and color drift at high temperature hinder the high-quality application of the phosphor -converted white light-emitting diodes (pc-WLEDs) devices, thus it is urgent to develop the single-phase white-emitting phosphors with good chromatic stability. In this work, a series of color-tunable Y3TaO7:Bi3+, Eu3+ phosphors are designed by co-doping Bi3+ and Eu3+ based on the crystal structure information and energy transfer principle between Bi3+ and Eu3+, which can be adjusted to achieve single-phase white emission. By increasing the temperature to a high value of 473 K, the emission peak of Bi3+ ions still present at 470 nm in Y3TaO7:Bi3+ phosphors even when the concentration of Bi3+ ions changes, and the characteristic emission peaks of Bi3+ and Eu3+ basically maintain unchanged throughout in Y3TaO7:Bi3+, Eu3+ phosphors. Finally, the single-phased Y3TaO7:Bi3+, Eu3+, 0.06Eu(3+) phosphor was employed with ultraviolet chip to produce a warm WLED device with color rendering index of 81.5, correlated color temperature of 4165 K and the Commission International de I ' Eclairage chromaticity coordinates of (0.3645, 0.3347). The results indicate that Y3TaO7:Bi3+, Eu3+ phosphors with high chromaticity stability have great application potential in full-spectrum WLEDs
Director Innovation Fund of Synthetic Biology Technology Innovation Center of Shandong Province[sdsynbio-2020-ZH-02]
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Na_2O-TiO_2-SiO_2-CaO-Al_2O_3-V_2O_5-MnO-MgO-FeO渣系渣铁间硫分配比热力学模型
No full text基于离子分子共存理论(IMCT)建立了Na_2O-TiO_2-SiO_2-CaO-Al_2O_3-V_2O_5-MnO-MgO-FeO九元渣系的结构单元作用浓度模型和渣铁间硫分配比热力学模型,并对模型进行实验验证。通过模型计算出1200℃下渣系主要结构单元组成和渣中Na_2O,CaO,MnO,MgO和FeO的活度,发现Na_2O的加入可促进渣中低熔点物质的生成,降低渣系熔化性温度,改善脱硫反应的动力学条件;同时随着Na_2O加入量的增加,渣中Na_2O和CaO的活度增加,进而降低渣中S~(2-)离子活度,强化渣铁间脱硫反应。实验结果表明,增加碱矿比提高了渣铁间硫分配比,有利于铁水深度脱硫,铁水中硫含量可降至0.0005wt%以下,硫分配比的理论计算值与实验结果吻合极好。渣中各碱性氧化物的硫分配比随碱矿比R_(N/C)增加逐渐增大,各碱性氧化物硫分配比大小为Na_2O>CaO>MnO>FeO>MgO。本研究将共存理论模型成功应用到九元复杂渣系渣铁间脱硫反应机理研究,为铁水深度脱硫过程的渣系优化提供了理论依据
科学数据语义关联技术研究与应用
No full text【目的】在数据密集型和融合科学新范式下,迫切需要传统的数据共享服务向数据知识化服务转化,使用语义关联技术在海量科学数据间进行知识组织、关联、发现正是解决这个问题的核心路径。【方法】本文对国内外数据关联技术总体现状、领域应用研究进展进行了广泛调研,对结构化数据关联发布、长文本语义挖掘和数据关联融合服务等关键技术进行了深入研究,初步实现了领域科学数据的关联化组织发布和语义化融合服务。【结果】在化学、植物及微生物数据中心展开应用实践,验证了科学数据语义关联融合技术是实现数据知识化服务的可行且重要手段。【结论】未来由各领域数据中心建立起来的科学数据关联融合网络将成为服务科研新范式需求的重要数据基础设施
An improved EMMS model for turbulent flow in pipe and its solution
No full textBased on the existing energy-minimization multi-scale (EMMS) model for turbulent flow in pipe, an improved version is proposed, in which not only a new radial velocity distribution is introduced but also the quantification of total dissipation over the cross-section of pipe is improved for the dominant mechanism of fully turbulent flow in pipe. Then four dynamic equality constraints and some other constraints are constructed but there are five parameters involved, leading to one free variable left. Through the compromise in competition between dominant mechanisms for laminar and fully turbulent flow in pipe respectively, the above four constructed dynamic equality constraints can be closed. Finally, the cases for turbulent flow in pipe with low, moderate and high Reynolds number are simulated by the improved EMMS model. The numerical results show that the model can obtain reasonable results which agree well with the data computed by the direct numerical simulation and those obtained by experi-ment. This illustrates that the improved EMMS model for turbulent flow in pipe is reasonable and the compromise in competition between dominant mechanisms is indeed a universal governing principle hidden in complex systems. Especially, one more EMMS model for a complex system is offered, pro-moting the further development of mesoscience.(c) 2022 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved
