Plasma Enhanced Lithium Coupled with Cobalt Fibers Arrays for Advanced Energy Storage

Construction of high efficiency and stable Li metal anodes is extremely vital to the breakthrough of Li metal batteries. In this study, for the first time, groundbreaking in situ plasma interphase engineering is reported to construct high-quality lithium halides-dominated solid electrolyte interphase layer on Li metal to stabilize & protect the anode. Typically, SF₆ plasma-induced sulfured and fluorinated interphase (SFI) is composed of LiF and Li₂S, interwoven with each other to form a consecutive solid electrolyte interphase. Simultaneously, brand-new vertical Co fibers (diameter: ≈5 µm) scaffold is designed via a facile magnetic-field-assisted hydrothermal method to collaborate with plasma-enhanced Li metal anodes (SFI@Li/Co). The Co fibers scaffold accommodates active Li with mechanical integrity and decreases local current density with good lithiophilicity and low geometric tortuosity, supported by DFT calculations and COMSOL Multiphysics simulation. Consequently, the assembled symmetric cells with SFI@Li/Co anodes exhibit superior stability over 525 h with a small voltage hysteresis (125 mV at 5 mA cm⁻²) and improved Coulombic efficiency (99.7%), much better than the counterparts. Enhanced electrochemical performance is also demonstrated in full cells with commercial cathodes and SFI@Li/Co anode. The research offers a new route to develop advanced alkali metal anodes for energy storage.     

基于CNN特征的宽频段智能测向方法

当前电磁环境日益复杂,利用机器学习方法实现快速且精确的宽频段无线电测向逐渐成为研究的热点。使用卷积神经网络基于端到端的方式完成宽频段测向的方法能够在一定程度上解决宽频段相位模糊的问题,但卷积运算后特征维数大大增加,稀疏的特征影响了最后一层全连接前馈神经网络的分类效果。针对这一问题,提出将无线电测向分为特征学习任务和方向预测任务,使用卷积神经网络作为特征提取器,将通过多层卷积运算得到的结果视为二次提取的特征,作为方向预测任务的输入;针对二次提取特征的稀疏性,提出使用主成分分析算法对特征进行降维,并将稀疏性降低后的特征作为后续分类器的输入。此外,针对特征的特点,探索了几种分类模型作为分类器的效果,包括决策树、随机森林、径向基函数神经网络和K-近邻。实验结果表明,使用主成分分析算法对特征进行降维能够提升训练和测试效率;采用K-近邻构成分类器的准确度明显高于原卷积神经网络的准确度;若需要兼顾准确度和测向效率,采用随机森林构成分类器的效果最好。     

螺旋焊管内涂层涂敷挥发份的清除

针对大口径螺旋焊管内涂层涂敷作业时，钢管内残留的涂料挥发份如何清除的问题，介绍了一种自行设计制造的内涂层涂敷挥发份吹除装置。     

退火对GaAs窗口晶体力学性能的影响

在L EC Ga As晶片中,存在相当大的弹性应变,在高温退火后,晶片的晶格参数的相对变化量不到原生晶片的70 % ,残余应力得以部分释放,从而减小残余应力诱生断裂的可能性,提高了Ga As晶体的断裂模数.原生Ga As晶体加工的样品的断裂模数平均值约为135 MPa,而退火Ga As晶体加工的样品的断裂模数平均值更高,约为15 0 MPa,断裂模数最高值达16 3MPa.     

光泵用大功率半导体激光器列阵

本文报导工作波长适合于泵浦掺Nd固体激光器的GaAIAs/G&As激光锁相列阵。采用氧化物掩蔽和Zn扩散条形结构工艺,获得了十单元列阵器件。其工作波长为809±5nm,输出功率大于200mW。已用于Nd∶YAG和Nd玻璃激光器的泵浦。     

Precisely Controlled Hydration Water for Performance Improvement of Organic–Inorganic Perovskite Solar Cells

Recently, intensive studies on the role of water molecule in the formation of organic–inorganic perovskite film have been reported. However, not only the contradictive phenomena but also the complex processing technique has hindered the widespread use of water molecule in perovskite preparation. Here the hydration water is introduced into the precursors instead of water. By precisely controlling the content of hydration water, a smoother and more uniform perovskite film is obtained through a simple one‐step spin coating method. The improvement of perovskite film quality leads to highly efficient planar perovskite solar cells. Summing up the device studies and the investigation of morphology, crystallization, and optical properties, the impact of water molecule in the formation of perovskite crystal and consequences of device performance is understood. Due to its universal adaptability and simplified process, precise control of hydration water is therefore of great utility to high quality perovskite films fabrication and large‐scale production of this upcoming photovoltaic technology.     

白栎淀粉的特性

采用X射线衍射仪、粒度仪、差示扫描量热仪(DSC)、分光光度计、质构仪等对白栎淀粉的结构及性质进行研究,并与玉米淀粉进行比较。结果表明:白栎淀粉颗粒粒径较小,平均粒径为3.15μm,结晶结构属A型,直链淀粉含量18.90%,糊化温度为72.3～84.7℃;白栎淀粉溶解性和膨润力高于玉米淀粉;白栎淀粉糊具有透明度低、凝沉性大、冻融稳定性差、黏度小、酶解率较高的特点;质构分析表明白栎淀粉糊凝胶强度较大,质地和口感较好。     

比较几种髙酸原油及其柴油、蜡油馏分的石油酸组成

Three high-acidity crudes,Dar,SZ36-1,and QHD326,were separated through distillation into several fractions,including diesel distillates,and VGOs.Samples were characterized by negative-ion ESI FT-ICR MS.The O 2 class species (petroleum carboxylic acids),which have a close relationship with corrosion of equipment caused by high-acidity crudes,were put in the focus of attention and were discussed in this paper.Monocyclic,bicyclic,and tricyclic naphthenic acids are the main types of petroleum carboxylic acids in naphthenic-base crudes (SZ36-1 and QHD326).But the main types of petroleum carboxylic acids in paraffinic-base crude (Dar) are aliphatic acids and monocyclic naphthenic acids.The O 2 class species in SZ36-1 and QHD326 are distributed in a wider range and have bigger DBE value (double-bond equivalence value) and carbon number than Dar.Bicyclic naphthenic acids have the highest proportion among petroleum carboxylic acids in diesel distillates,but monocyclic and tricyclic naphthenic acids also occupy a high proportion.Particularly,aliphatic acids in the diesel distillate of Dar still have high proportion among petroleum carboxylic acids.The distribution of petroleum carboxylic acids in VGO is basically identical.The bicyclic naphthenic acids assume the first place (about 25 m%),while the monocyclic and tricyclic naphthenic acids take the next place.The comparison of petroleum carboxylic acids in diesel distillates and VGOs has revealed that the molecules of carboxylic acids in VGOs are not only bigger but also more complicated.     

SiCp/2024复合材料的氢脆敏感性研究

在浸泡、阴极极化、阴极极化同时迭加拉伸变形、添加As₂O₃毒化剂等常见致氢条件下,通过慢应变速率拉伸试验研究了SiC_p/2024复合材料的力学性能,考察了断口形貌.测定了该材料在按几种常用充氢条件充氢后的氢含量.发现虽然强烈阴极极化使材料力学性能下降,但其原因在于阴极极化引起的碱性腐蚀,与氢脆无关.获得了不同于前人研究的新结论:在本文试验条件下SiC_p/2024材料不发生氢脆,也不发生不可逆氢损伤,其原因与该材料难以充入氢有关.     

基于ARM的分布式过载仪系统设计

为了对设备运输过程中受到的加速度与所处位置进行远程监控与记录,设计了一种基于ARM的分布式过载仪系统,过载仪硬件方面采用多传感器如陀螺仪,加速度芯片、GPS芯片等。软件方面,信号的监控使用WEB技术,通过GPRS将数据传送至网页进行实时监控。实验部分,将设计的过载仪系统装载在自行车上,并在同一路段上进行多次数据采集测试。实验结果表明,该系统能够对被测对象的各种运动轨迹,路况和状态进行实时监测,其能够保证数据采集、处理与传输的可靠性与稳定性。