Dual effect synergistically triggered Ce:(Y,Tb)3(Al,Mn)5O12 transparent ceramics enabling a high color-rendering index and excellent thermal stability for white LEDs

Ce:Y₃Al₅O₁₂ transparent ceramics (TCs) with appropriate emission light proportion and high thermal stability are significant to construct white light emitting diode devices with excellent chromaticity parameters. In this work, strategies of controlling crystal-field splitting around Ce³⁺ ion and doping orange-red emitting ion, were adopted to fabricate Ce:(Y,Tb)₃(Al,Mn)₅O₁₂ TCs via vacuum sintering technique. Notably, 85.4 % of the room-temperature luminescence intensity of the TC was retained at 150 °C, and the color rendering index was as high as 79.8. Furthermore, a 12 nm red shift and a 16.2 % increase of full width at half maximum were achieved owing to the synergistic effects of Tb³⁺ and Mn²⁺ ions. By combining TCs with a 460 nm blue chip, a warm white light with a low correlated color temperature of 4155 K was acquired. Meanwhile, the action mechanism of Tb³⁺ ion and the energy transfer between Ce³⁺ and Mn²⁺ ions were verified in prepared TCs.     

Controlling thickness to tune performance of high-mobility transparent conducting films deposited from Ga-doped ZnO ceramic target

Structure modification has been found to tune significantly the transparent-conducting performance, especially mobility and conductivity of hydrogenated Ga-doped ZnO (HGZO) films. The strong correlation between film thickness and mobility of the films is revealed. The mobility increases quickly with increasing the thickness from 350 to 900 nm, and then tends to be saturated at further thicknesses. A higher mobility than 50 cm²/Vs can be achieved, which is an extra-high value for polycrystalline ZnO films deposited by using the sputtering technique. The thickness-dependent mobility originates from scatterings on grain boundaries and dislocation-induced defects controlled by thin-film growth. Based on the Volmer-Weber model, an expansion model is built up to describe the thickness-dependent crystal growth of the HGZO films, especially at the thick films. As a result, the 800 nm-thick HGZO film obtains the highest performance with high mobility of 51.5 cm²/Vs, low resistivity of 5.3 × 10^?4 Ωcm, and good transmittance of 83.3 %.     

超声预处理对控制南水藻类的可行性探究

针对夏季高藻时期的北方某市南水北调原水,研究了以超声波预处理工艺代替加氯预处理工艺的可行性.在小试试验的基础上进行了中试试验,对比了无预处理、加氯预处理与超声预处理3种工艺处理效果的差异.结果 表明,超声预处理频率为40 kHz、功率为0.12 W/cm2、处理时间为2 min时,对浑浊度、藻类数量和溶解性有机物的处理...     

微纳米气泡形成羟基自由基的研究进展

从微纳米气泡溶液中是否可以产生·OH、·OH的鉴别方法、·OH的生成机理以及强化·OH的生成等几个方面论述了微纳米气泡溶液中生成·OH的研究进展.电子自旋共振技术和荧光分光光度法作为检测·OH的2种技术,均存在一定的误导性,对于荧光分光光度法,最重要的就是排除H2 O2的干扰.此外,目前要获得含有高浓度·OH的微纳米气...     

二维金属有机框架材料的制备及其应用

二维金属有机框架（MOFs）作为一类新型的二维多孔材料,具有厚度小、比表面积大、孔隙率高、可接触活性位点丰富等优点,在众多领域都具有研究和潜在的应用价值。本文简要综述了近年来二维MOFs的制备方法,包括“自上而下”和“自下而上”两种策略。自上而下法操作简单,有广泛的适用性;自下而上法可以通过控制实验条件在一定程度上实现对材料的可控制备。阐述了二维MOFs在电化学储能、催化、传感、气体分离等领域的应用研究。深层剖析了二维MOFs的特性对储能器件电化学性能以及反应催化活性的影响。此外,二维MOFs的高电导率和电荷转移率还促进了其在电化学传感器方面的发展;基于二维MOFs的分子筛膜也越来越受到研究人员的关注。最后指出了二维MOFs存在易团聚、厚度难以精确控制、制取成本较高、产率偏低等问题,提出了解决方案及其未来的发展方向。     

Analysis of Temperature Effect in Quadruple Gate Nano-scale FinFET

Silicon - Quadruple gate FinFET is a promising candidate among other multi-gate MOS devices due to it’s better scalability and higher short channel effect suppression capability in advanced...     

A panoramic view of Li7P3S11 solid electrolytes synthesis,structural aspects and practical challenges for all-solid-state lithium batteries

The development of an inorganic electrochemical stable solid-state electrolyte is essentially responsible for future state-of-the-art all-solid-state lithium batteries (ASSLBs). Because of their advantages in safety, working temperature, high energy density, and packaging, ASSLBs can develop an ideal energy storage system for modern electric vehicles (EVs). A solid electrolyte (SE) model must have an economical synthesis approach, exhibit electrochemical and chemical stability, high ionic conductivity, and low interfacial resistance. Owing to its highest conductivity of 17 mS·cm^-1, and deformability, the sulfide-based Li₇P₃S₁₁ solid electrolyte is a promising contender for the high-performance bulk type of ASSLBs. Herein, we present a current glimpse of the progress of synthetic procedures, structural aspects, and ionic conductivity improvement strategies. Structural elucidation and mechanistic approaches have been extensively discussed by using various characterization techniques. The chemical stability of Li₇P₃S₁₁ could be enhanced via oxide doping, and hard and soft acid/base (HSAB) concepts are also discussed. The issues to be undertaken for designing the ideal solid electrolytes, interfacial challenges, and high energy density have been discoursed. This review aims to provide a bird's eye view of the recent development of Li₇P₃S₁₁-based solid-state electrolyte applications and explore the strategies for designing new solid electrolytes with a target-oriented approach to enhance the efficiency of high energy density all-solid-state lithium batteries.     

微波诱导催化脱硝研究进展

发展经济高效的烟气脱硝技术是大气污染控制领域的重要研究方向,利用微波诱导催化技术开展烟气脱硝已成为当前热点方向。本文对近年国内外研究人员关于微波诱导催化治理烟气NO_x的研究成果进行了综述,详细介绍了微波还原脱硝和微波氧化脱硝相关成果,重点讨论了以碳酸氢铵和活性炭为还原剂的微波诱导还原催化脱硝技术以及ZSM-5、金属氧化物和钙钛矿型混合氧化物微波催化还原脱硝技术。最后通过对比微波还原脱硝和微波氧化脱硝两种方法,提出研发微波催化氧化脱硝技术、探究其反应机理是开发新型烟气脱硝技术的重要方向。     

流域生态环境需水与缺水的快速评估(Ⅰ)：理论

为识别生态环境缺水严重的区域,合理评价生态环境用水的配置效果,本文提出了一种新的流域生态环境需水与生态环境缺水快速评估方法。将流域的生态环境需水满足程度定义为,流域"实际生态环境用水"与流域在未受或少受人类活动干扰时的"自然状态条件下的生态环境用水"的接近程度。以土地利用资料为基础,运用层次分析法构建流域生态环境需水特征指标来表征流域生态环境用水的相对大小;借鉴水体生物快速评估法的思想,通过流域单元划分、参照单元选择、参照组构建、参照组匹配、观测值与期望值的比较计算等步骤,可以对不同级别流域的生态环境缺水问题进行深入分析,从而快速识别生态环境缺水严重区域、预测其生态环境缺水动态变化,并对生态环境用水配置效果进行评价。