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From protonation & Li-rich contamination to grain-boundary segregation: Evaluations of solvent-free vs. wet routes on preparing Li_(7)La_(3)Zr_(2)O_(12) solid electrolyte

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Journal of Energy Chemistry 2022年第10期31卷 223-239,I0005页

作者： Xiao Huang Yang Lu Yajun Niu Jiawen Tang Yongjian Zhou Yan Yang Bingbing Tian SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060GuangdongChina Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Collaborative Innovation Center for Vessel Pollution Monitoring and Control Dalian Maritime UniversityDalian 116026LiaoningChina

Garnet-type Li_(7)La_(3)Zr_(2)O_(12)(LLZO) has been recognized as a candidate solid electrolyte for high-safety Lianode based solid-state batteries because of its electro-chemical stability against Li-metal and high ionic conductivity. Solvent(e.g., isopropanol(IPA)) has been commonly applied for preparing LLZO powders and ceramics. However, the deterioration of the proton-exchange between LLZO and IPA/absorbed moisture during the mixing and tailoring route has aroused less attention. In this study, a solvent-free dry milling route was developed for preparing the LLZO powders and ceramics. For orthogonal four categories of samples prepared using solvent-free and IPA-assisted routes in the mixing and tailoring processes, the critical evaluation was conducted on the crystallinity, surficial morphology, and contamination of ascalcinated and as-tailored particles, the cross-sectional microstructure of green and sintered pellets,the morphology and electro-chemical properties of grain boundaries in ceramics, as well as the interfacial resistance and performance of Li anode based symmetric batteries. The wet route introduced Li-rich contaminations(e.g., Li OH·H)_(2)O and Li)_(2)CO)_(3)) onto the surfaces of LLZO particles and Li-Ta-O segregations at the adjacent and triangular grain boundaries. The LLZO solid electrolytes prepared through dry mixing in combination with the dry tailoring route without the use of any solvent were found to the optimal performance. The fundamental material properties in the whole LLZO preparation process were found, which are of guiding significance to the development of LLZO powder and ceramic production craft.

关键词： Li_(7)La_(3)Zr_(2)O_(12) Solid electrolyte Solvent-free procedure Ion-exchange Grain boundary Fundamental material properties

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Constructing stable Li-solid electrolyte interphase to achieve dendrites-free solid-state battery:A nano-interlayer/Li prereduction strategy

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Nano Research 2022年第8期15卷 7180-7189页

作者： Yajun Niu Zhaozhe Yu Yongjian Zhou Jiawen Tang Maoxin Li Zechao Zhuang Yan Yang Xiao Huang Bingbing Tian Guangxi Key Laboratory of Manufacturing Systems and Advanced Manufacturing Technology Guilin University of Electronic TechnologyGuilin 541004China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Department of Chemistry Tsinghua UniversityBeijing 100084China Collaborative Innovation Center for Vessel Pollution Monitoring and Control Dalian Maritime UniversityDalian 116026China

Solid-state batteries based on Li and nonflammable solid-state electrolytes(SSEs)have aroused the attention of numerous researchers because of their absolute safety and potentially high energy density.Most SSEs after coming into contact with Li are reduced,which leads to high interfacial charge-transfer impedance and dendrites formation.In this study,an“interlayer-Li pre-reduction strategy”was proposed to solve the above problem of reduction.An intermediate layer was introduced between solid electrolyte and Li,and it reacted with Li to produce a stable and ion-conductive interphase.Cubic garnet-type Nb-doped Li_(7)La_(3)Zr_(2)O_(12)(Nb-LLZO)was selected as an example solid electrolyte since it is characterized by high ionic conductivity,feasible preparation under ambient conditions,as well as low cost.The high impedance arising from the reduction at the Nb-LLZO|Li interface has limited its application.In this paper,a nano-scale Li phosphorus oxynitride(LiPON)layer was deposited on the Nb-LLZO pellets through radio frequency(RF)magnetron sputtering,which pre-reacted with Li in-situ to produce a lithiophilic,electronically insulating,and ionic conductive interphase.The produced interphase significantly inhibited the reduction of Nb5+against Li and the formation and propagation of Li dendrites.It is noteworthy that Li|LiPON|Nb-LLZO|LiPON|Li cells stably cycled for over 2,000 h without any short circuit.This study emphasizes and demonstrates the significance of the pre-conversion of modification layer between unstable SSE and Li metal to improve interfacial stability.

关键词： Nb-doped Li_(7)La_(3)Zr_(2)O_(12)(Nb-LLZO) conversion reaction Li phosphorus oxynitride(LiPON) interfacial reduction solid-state battery

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Off-axis three-mirror reflective zoom system based on freeform surface

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Frontiers of Optoelectronics 2016年第4期9卷 609-615页

作者： Guijuan XIE Jull CHANG Ke ZHANG Jide ZHOU Yajun Niu School of Optoeleetronies Beijing Institute of Technology Beijing 100081 China

A reflective optical system is not affected by chromatic aberration, so it has a wide range of applications. Based on the design theory of reflective zoom system with three mirrors, this paper presents the simulation, optimiza- tion, and image quality evaluation of the traditional off- axis three-mirror zoom system and freeform off-axis three- mirror reflective zoom system.. In these systems, the optical design was aided by software CODEV. Through the analysis of aberrations and structural performance for the traditional aspherical off-axis three-mirror system, the freeform surface was introduced to the tertiary mirror to improve the balance capacity for optical aberrations. This off-axis three-mirror reflective zoom system based on freeform surface could provide technical reference to the study of such systems.

关键词： off-axis system design three-mirror reflectivezoom system freeform surface optical design

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Design and demonstration of a foveated imaging system with reflective spatial light modulator

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Frontiers of Optoelectronics 2017年第1期10卷 89-94页

作者： Xi WANG Jun CHANG Yajun Niu Xiaoyu DU Ke ZHANG Guijuan XIE Bochuan ZHANG School of Opto-electronics Beijing Institute of Technology Beijing 100081 China China North Vel~icle Research Institute Beijing-100072-China Beijing Aerospace Automatic Control Institute Beijing 100854 China

In this paper, a foveated imaging system using a reflective liquid crystal spatial light modulator （SLM） was designed. To demonstrate the concept of foveated imaging, we simulated with software Code V and established a laboratory prototype. The result of the experiment shows that an SLM can be used to correct the aberration of region of interest （ROI） while the resolution of other area was still very low. The vary- resolution system was relative simple compared to the traditional high resolution system and obviously can reduce the amount of data transmission. Such systems will have wide application prospect in various fields.

关键词： optical design foveated imaging spatial lightmodulator （SLM） tolerance analysis

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A 16-bit Hybrid ADC with Circular-Adder-Based Counting for 15μm Pitch 640×512 LWIR FPAs

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Chinese Journal of Electronics 2020年第2期29卷 291-296页

作者： HUANG Zhaofeng ZHU yajun LU Wengao niu Yuze ZHANG Shengdong CHEN Zhongjian School of Electronic and Computer Engineering Peking University Department of Microelectronics Peking University

A hybrid Analog to digital converter(ADC) is presented for long-wave infrared focal plane arrays. A two-stage quantization structure is applied in the folding integration process, which results in better chargehandling capacity and higher linearity compared with conventional designs while using fewer transistors at the pixel level. By employing a circular-adder-based counting structure with 3 T dynamic memory cells, hardware consumption can be reduced. A pixel circuit of pitch15μm has been designed using the 0.18μm Complementary metal-oxide-semiconductor(CMOS) process. The power consumption of the pixel-level ADC is 0.214μW, and the charge-handling capacity is 1 Ge-. Simulation results demonstrate a signal-to-noise ratio of 90 d B and a nonlinearity of 0.11%.

关键词： Infrared focal plane arrays(IRFPAs) Readout integrated circuit Hybrid ADC 3T memory Folding integration

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基于视频自动定位技术的煤尘监测系统

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煤炭科学技术 2019年第S02期47卷 132-136页

作者：牛亚军神华神东煤炭集团有限责任公司信息管理中心陕西神木719315

针对煤矿井下降尘装置的工作状态的控制难度大、监测技术难等问题,设计一套基于视频自动定位技术的煤尘监测系统,定义了系统的基本架构,阐述了功能模块的具体实现。该系统结合CAN总线协议与TCP/IP网络协议,实现了对煤尘浓度与降尘装置... 详细信息

针对煤矿井下降尘装置的工作状态的控制难度大、监测技术难等问题,设计一套基于视频自动定位技术的煤尘监测系统,定义了系统的基本架构,阐述了功能模块的具体实现。该系统结合CAN总线协议与TCP/IP网络协议,实现了对煤尘浓度与降尘装置的工作状态的独立感知、综合传输与关联控制,完成了煤尘浓度的有效监测与降尘装置的准确控制。

关键词：物联网视频煤尘监测降尘装置

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Robust Recommendation Algorithm Based on Kernel Principal Component Analysis and Fuzzy C-means Clustering

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Wuhan University Journal of Natural Sciences 2018年第2期23卷 111-119页

作者： YI Huawei niu Zaiseng ZHANG Fuzhi LI Xiaohui WANG yajun School of Electronics and Information Engineering Liaoning University of Technology Jinzhou 121001 Liaoning China School of Information Science and Engineering YanshanUniversity Qinhuangdao 066004 Hebei China

The existing recommendation algorithms have lower robustness in facing of shilling attacks. Considering this problem, we present a robust recommendation algorithm based on kernel principal component analysis and fuzzy c-means clustering. Firstly, we use kernel principal component analysis method to reduce the dimensionality of the original rating matrix, which can extract the effective features of users and items. Then, according to the dimension-reduced rating matrix and the high correlation characteristic between attack profiles, we use fuzzy c-means clustering method to cluster user profiles, which can realize the effective separation of genuine profiles and attack profiles. Finally, we construct an indicator function based on the attack detection results to decrease the influence of attack profiles on the recommendation, and incorporate it into the matrix factorization technology to design the corresponding robust recommendation algorithm. Experiment results indicate that the proposed algorithm is superior to the existing methods in both recommendation accuracy and robustness.

关键词： robust recommendation shilling attacks matrixfactorization kernel principal component analysis fuzzy c-meansclustering

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唐诗中表达乡愁的常见意象及诗篇浅析

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晋城职业技术学院学报 2023年第4期16卷 67-70页

作者：牛雅珺晋城职业技术学院山西晋城048026

唐代诗人往往用新奇的“意象”来抒发自己的情感。悠悠唐诗中,浓浓乡情经常被诗人通过“秋”“月”“笛”“雁”等意象来表达,为此,整理了部分借用这些意象抒发乡愁的唐诗并作简要分析。

关键词：唐诗乡愁意象

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基于键合图模型的机车制动系统故障检测与隔离

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同济大学学报（自然科学版） 2015年第6期43卷 894-899页

作者：牛刚赵亚君同济大学铁道与城市轨道交通研究院上海201804

针对机车制动机列车管压力控制模块,采用键合图理论开展了动态建模分析,由建立的故障键合图模型推导出相应的解析冗余关系,提取出完整的故障特征矩阵.利用序贯概率比检验方法对采集的监测数据进行连续判读,实时跟踪识别工况下的系统异... 详细信息

针对机车制动机列车管压力控制模块,采用键合图理论开展了动态建模分析,由建立的故障键合图模型推导出相应的解析冗余关系,提取出完整的故障特征矩阵.利用序贯概率比检验方法对采集的监测数据进行连续判读,实时跟踪识别工况下的系统异常状况,并将得到的残差状态向量同故障特征矩阵进行匹配,实现对故障部件的检测与隔离.仿真实例验证了建议方法的技术可行性.

关键词：制动系统故障检测与隔离键合图序贯概率比检验

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斜沟矿18203综采工作面配套设备选型研究

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机电工程技术 2019年第12期48卷 130-132页

作者：牛亚军西山煤电晋兴能源有限责任公司斜沟煤矿

针对斜沟矿18203综采工作面倾角大、煤层厚等特点,利用实际勘测与数学计算相结合的方法对该工作面的5机配套设备与支护设备进行选型研究。研究表明:该工作面选用MG1000/2660-WD型双滚筒采煤机,SGZ1250/2×1200型可弯曲刮板板输送机ZY120... 详细信息

针对斜沟矿18203综采工作面倾角大、煤层厚等特点,利用实际勘测与数学计算相结合的方法对该工作面的5机配套设备与支护设备进行选型研究。研究表明:该工作面选用MG1000/2660-WD型双滚筒采煤机,SGZ1250/2×1200型可弯曲刮板板输送机ZY12000/28/64D型支撑掩护式液压支架时可以满足工作面的采用要求,而且可以大大提高该工作面的生产效率。

关键词：设备选型 5机配套液压支架

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