检索结果-内蒙古大学图书馆

Research on the parameter calibration and the interaction mechanisms of irregular wet particles

POWDER technology 2025年 457卷

作者： Zhou, Jiacheng Liu, Fei Zhang, Libin Chen, Liuyang Wang, Xuesong Duan, Chenlong Jiang, Haishen Pan, Miao Wuhan Text Univ Sch Mech Engn & Automat Hubei Key Lab Digital Text Equipment Wuhan 430200 Peoples R China Zhejiang Univ State Key Lab Silicon & Adv Semicond Mat Hangzhou 310027 Peoples R China China Univ Min & Technol Sch Chem Engn & Technol Xuzhou Peoples R China Taiyuan Heavy Machinery Grp Co Ltd Taiyuan Peoples R China

To increase the accuracy of simulation parameters for wet irregular particles and investigate the interaction mechanisms between wet particles, the parameters for three types of irregular wet particles are calibrated and validated. Firstly, the models for the three types of wet irregular particles are constructed, and the corresponding stacking angles are obtained. Then, the linear regression equation between the significant parameters and the particle stacking angle is established to validate the relative errors. The results showed that the relative errors for the simulated and experimental stacking angles of the capsule, cassia seed, and colored sand particles are 1.83 %, 1.51 %, and 2.23 %, respectively. These relative errors are lower than those reported in existing literature. Moreover, particle fluidity tests are conducted to explore the particle interaction mechanisms. The results indicate that the smooth and hydrophilic particle surfaces are more likely to accumulate water molecules and form liquid bridges, which lead to enhanced adhesion and decreased particle fluidity. On the contrary, the liquid bridge is more prone to fracture on a rough and hydrophobic particle surface, which leads to decreased adhesion and enhanced particle fluidity. The study demonstrates that this parameter calibration method and the interaction mechanisms of wet irregular particles are reliable.

关键词： Irregular wet particles DEM modeling Stacking angle Parameter calibration JKR model Interaction mechanisms

来源：评论

学校读者我要写书评

暂无评论

Control of Variable Speed Pumped Storage Unit Based on Power Electronic Transformer Under Unbalance of Power Grid Voltage

Control of Variable Speed Pumped Storage Unit Based on Power...

引用

International Conference on Electrical Machines and Systems (ICEMS)

作者： Pei Huang Xiang Peng Renjun Dian School of Information Science and Engineering Wuhan University of Science and Technology Wuhan China Engineering Research Center for Metallurgical Automation and Measurement Technology of Ministry of Education Wuhan University of Science and Technology Wuhan China

ISBN: (数字)9784886864406

ISBN: (纸本)9798350379105

To enhance the power density and improve the grid-connection capability of the variable-speed pumped storage unit, this paper proposes a topology for full-power variable-speed pumped storage based on power electronic transformer. This topology does not require a power frequency transformer and can isolate the double frequency fluctuation of the high-voltage DC bus voltage in the event of asymmetric faults in the grid, so as not to affect the control of the motor side and improve the unit's ability to adapt to the power grid.

关键词： Fluctuations Pumps High-voltage techniques Transformers Motors Power grids Power electronics Topology Voltage control Frequency control

来源：评论

学校读者我要写书评

暂无评论

A facile electrochemical lithiation method to prepare porous nickel oxide electrodes with high electrochromic performance

引用

ELECTROCHIMICA ACTA 2023年第1期441卷

作者： Zhao, Fangyuan Cheng, Ziqiang Xu, Gang Liu, Yong Han, Gaorong Zhejiang Univ Sch Mat Sci & Engn State Key Lab Silicon Mat Hangzhou 310027 Peoples R China Shanxi Zheda Inst Adv Mat & Chem Engn Taiyuan 030001 Shanxi Peoples R China

A facile electrochemical lithiation method was developed in the framework of the wet chemical route, and NiO films with various lithium contents have been successfully prepared. The structure and electrochromic properties were characterized using SEM, HRTEM, XRD, XPS, etc. The results indicate that all NiO films show a porous morphology, and the ratio of Ni3+/Ni2+ increases from 1.12 to 1.46 after electrochemical lithiation. The storage capacity in lithium electrolytes, effective ionic diffusion rate, transmittance modulation, and coloring efficiency are effectively improved. The optimized NiO electrode exhibits an excellent storage capacity of 6.4 mC/cm2 and transmittance modulation at 550 nm of 35.7%, compared to the pristine NiO (Q = 4.4 mC/cm2, Delta T = 24.3%). Two electrochromic devices were respectively assembled with the pristine and lithiated NiO electrodes as the anodic electrochromic layer. The latter exhibits higher transmittance modulation and coloring efficiency, proving that the electrochemical lithiation method is an effective way to prepare high-performance electro-chromic devices.

关键词： Electrochemical lithiation Nickel oxide Electrochromic Porous film Chemical bath deposition

来源：评论

学校读者我要写书评

暂无评论

Verifiable and Dynamic Multi-keyword Search Over Encrypted Cloud Data Using Bitmap

引用

IEEE TRANSACTIONS ON CLOUD COMPUTING 2023年第1期11卷 336-348页

作者： Li, Feng Ma, Jianfeng Miao, Yinbin Jiang, Qi Liu, Ximeng Choo, Kim-Kwang Raymond Xidian Univ Sch Cyber Engn Xian 710071 Shaanxi Peoples R China Guilin Univ Elect Technol Guangxi Key Lab Trusted Software Guilin 541004 Peoples R China City Univ Hong Kong Dept Comp Sci Hong Kong 999077 Peoples R China Xidian Univ Sch Cyber Engn Shaanxi Key Lab Network & Syst Secur Xian 710071 Shaanxi Peoples R China Network Commun Res Ctr Peng Cheng Lab Shenzhen 518055 Guangdong Peoples R China Fuzhou Univ Coll Math & Comp Sci Key Lab Informat Secur Network Syst Fuzhou 350108 Fujian Peoples R China Univ Texas San Antonio Dept Informat Syst & Cyber Secur San Antonio TX 78249 USA

Searchable Symmetric Encryption (SSE), which enables users to search over encrypted data without decryption, has gained increasing attention from both academic and industrial fields. However, existing SSE schemes either have low search efficiency or cannot support multi-keyword search, dynamic updates, and result verification simultaneously. To solve these problems, we propose a Verifiable and Dynamic Multi-keyword Search (VDMS) scheme over encrypted data by using the bitmap and RSA accumulator, which provides multi-keyword search over encrypted data in an efficient, verifiable and updated way. The bitmap is used as a data structure to build the indexes, which improves the search efficiency and reduces the storage space of the indexes. The RSA accumulator and bitmap are combined to verify the correctness of results. Formal security analysis proves that our VDMS is adaptively secure against Chosen-keyword Attacks (CKA), and empirical experiments using a real-world dataset demonstrate that our VDMS is efficient and feasible in practical applications.

关键词： Searchable symmetric encryption multi-keyword search bitmap chosen-keyword attack

来源：评论

学校读者我要写书评

暂无评论

Recent Progress in and Perspectives on Emerging Halide Superionic Conductors for All‑Solid‑state Batteries

引用

Electrochemical Energy Reviews 2023年第1期6卷 234-279页

作者： Kaiyong Tuo Chunwen Sun Shuqin Liu School of Chemical and Environmental Engineering China University of Mining&Technology(Beijing)Beijing 100083China 21C Innovation Laboratory Contemporary Amperex Technology Ltd.(21C LAB)Ningde 352100FujianChina

Rechargeable all-solid-state batteries(ASSBs)are considered to be the next generation of devices for electrochemical energy *** development of solid-state electrolytes(SSEs)is one of the most crucial subjects in the field of energy storage *** newly emerging halide SSEs have recently been intensively studied for application in ASSBs due to their favorable combination of high ionic conductivity,exceptional chemical and electrochemical stability,and superior mechanical *** this review,a critical overview of the development,synthesis,chemical stability and remaining challenges of halide SSEs is *** design strategies for optimizing the ionic conductivity of halide SSEs,such as element substitution and crystal structure design,are summarized in ***,the associated chemical stability issues in terms of solvent compatibility,humid air stability and corresponding degradation mechanisms are *** particular,advanced in situ/operando characterization techniques applied to halide-based ASSBs are *** addition,a comprehensive understanding of the interface issues,cost issues,and scalable processing challenges faced by halide-based ASSBs for practical application is ***,future perspectives on how to design high-performance electrode/electrolyte materials are given,which are instructive for guiding the development of halide-based ASSBs for energy conversion and storage.

关键词： Halide solid-state electrolytes Synthesis Ionic conductivity Chemical stability In situ/operando characterization All-solid-state batteries

来源：评论

学校读者我要写书评

暂无评论

Highly efficient bifunctional layered triple Co, Fe, Ru hydroxides and oxides composite electrocatalysts for Zinc-Air batteries

引用

JOURNAL OF ELECTROANALYTICAL CHEMISTRY 2023年第1期935卷

作者： Gao, Yaling Zhang, Tongrui Mao, Yuezhen Wang, Jingyu Sun, Chunwen China Univ Min & Technol Beijing Sch Chem & Environm Engn Beijing 100083 Peoples R China

The preparation of bifunctional catalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is of great practical significance for the development of zinc-air batteries (ZAB). Layered double hydroxides (LDH) have been widely used in OER due to their low cost and adjustable structure. However, the poor ORR performance of LDH has hindered the development and application of zinc-air battery. In this work, CoFeRu-LDH was synthesized by hydrothermal method and then it was partially oxidized to obtain the oxides/LDH. As a bifunctional catalyst, RuO2, Fe2O3 and LDH have a high activity towards OER, while Co3O4 shows high reactivity towards ORR. Therefore, the catalyst oxides/LDH shows an excellent bifunctional activity with the voltage difference (Delta E) between E10 and E1/2 of 0.734 V. The assembled ZAB with the catalyst as the air electrode has a power density of 163 mW cm-2, a discharge specific capacity of 730 mAh g-1 and cycle stability of up to 210 h, proving its potential practical application in ZABs.

关键词： Bifunctional catalyst Layered hydroxides Oxide Synergistic effect Zinc -air battery

来源：评论

学校读者我要写书评

暂无评论

Brain-Inspired Visual Attention Modeling Based on EEG for Intelligent Robotics

引用

IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING 2024年第3期18卷 431-443页

作者： Hu, Shuzhan Duan, Yiping Tao, Xiaoming Chu, Jian Lu, Jianhua Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China State Key Lab Space Network & Commun Beijing 100084 Peoples R China

Vision, as the primary perceptual mode for intelligent robots, plays a crucial role in various human-robot interaction (HRI) scenarios. In certain situations, it is essential to utilize the visual sensors to capture videos for humans, assisting them in tasks like exploration missions. However, the increasing amount of video information brings great challenges for data transmission and storage. Therefore, there is an urgent need to develop more efficient video compression strategies to address this challenge. When perceiving a video, humans tend to pay more attention to some specific clips, which may occupy a small part of the whole video content, but largely affect the perceptual quality. This human visual attention (VA) mechanism provides valuable inspiration for optimizing video compression methods for HRI scenarios. Therefore, we combine psychophysiological paradigms and machine learning methods to model human VA and introduce it into the bitrate allocation to fully utilize the limited resources. Specifically, we collect electroencephalographic (EEG) data when humans watch videos, constructing an EEG dataset reflecting VA. Based on the dataset, we propose a VA measurement model to determine the VA states of humans in their underlying brain responses. Then, a brain-inspired VA prediction model is established to obtain VA metrics directly from the videos. Finally, based on the VA metric, more bitrates are allocated to the clips that humans pay more attention to. The experimental results show that our proposed methods can accurately determine the humans' VA states and predict the VA metrics evoked by different video clips. Furthermore, the bitrate allocation method based on the VA metric can achieve better perceptual quality at low bitrates.

关键词： Visual attention human-robot interaction intelligent robotics EEG video compression Visual attention human-robot interaction intelligent robotics EEG video compression

来源：评论

学校读者我要写书评

暂无评论

Elucidating the diffusion pathway of lithium ions in superionic halide solid electrolytes Li_(2+x)Hf_(1-x)In_(x)Cl_(6) for all-solid-state lithium-metal based batteries

引用

Journal of Energy Chemistry 2023年第12期87卷 12-23,I0002页

作者： Kaiyong Tuo Fusheng Yin Fanghui Mi Chunwen Sun School of Chemical&Environmental Engineering China University of Mining and Technology-BeijingBeijing 100083China

All-solid-state batteries(ASSBs) with inorganic solid-state-electrolytes(SSEs) have been regarded as the promising candidate for next-generation energy storage due to their high energy density and outstanding safety ***,the representative oxide and sulfide electrolytes suffer from low ionic conductivity and poor(electro)chemical stability,***,we report a series of new halide superionic conductors Li_(2+x)Hf_(1-x)In_(x)Cl_(6) with high ionic conductivity up to 1.05 mS cm^(-1) at 30 ℃ that are simultaneously stable to high *** means of the characterization techniques and bond-valence site energy(BVSE) calculation,insights into the effect of the phase transformation and underlying ionic transport mechanism by In substitution for Hf in Li_(2)HfCl_(6) are ***,with the increased amount of aliovalent substitution in Li_(2+x)Hf_(1-x)In_(x)Cl_(6) microcrystal framework,a gradual structure evolution from trigonal to monoclinic phase has been observed,which is accompanied by the redistribution of Li-ions to generate two dimensionally(2D) preferable diffusion pathways through octahedral-tetrahe dral-octahedral sites in In^(3+)-substituted Li_(2)HfCl_(6).Additionally,due to the oxidative stability of Insubstituted Li_(2)HfCl_(6),the bulk-type ASSBs with bare LiCoO_(2) deliver distinguished electrochemical performance.

关键词： Aliovalent substitution Halide electrolytes lonic conductivity All-solid-state batteries

来源：评论

学校读者我要写书评

暂无评论

Molecular design of a metal-organic framework material rich in fluorine as an interface layer for high-performance solid-state Li metal batteries

引用

CHEMICAL engineering JOURNAL 2023年第Part3期451卷

作者： Wang, Tianyuan Zhang, Xinling Yuan, Ning Sun, Chunwen China Univ Min & Technol Beijing Sch Chem & Environm Engn Beijing 100083 Peoples R China

Unstable electrolyte/electrode interface and uncontrolled Li dendrite growth hinder the large-scale commercial application of Li metal batteries. In this work, an artificial interfacial layer is developed to suppress the dendrite formation and the parasitic reactions between Li metal anode and electrolyte by the rational molecular design of a metal-organic framework material rich in fluorine (UiO-66(F)). The intrinsic nanochannels in UiO-66(F) promote the decomposition of lithium salts and limit the movement of anions. Moreover, the in situ formed LiF inhibits the Li dendrite growth. The composite electrolyte with the UiO-66(F) interfacial layer exhibits a wide electrochemical window (5.13 V vs Li/Li+), high ionic conductivity (4.9 x 10(-4) S cm(-1)), and ionic transference number (0.51) at room temperature. XPS results demonstrate that the in situ formed solid-electrolyte interface (SEI) is attributed to the active F groups in UiO-66(F). The symmetric cell with the optimized interfacial layer achieves excellent cycling performance over 2200 h at 0.2 mA cm(-2). In addition, the assembled full cell LiFePO4||Li also exhibits a capacity retention rate of 90.71 % after 960 cycles at 0.5 C. Even at higher rate of 2 C, it still exhibits a high discharge capacity of 139.6 mAh g(-1). This molecular design strategy for interfacial layer show great promise for practical applications of Li metal batteries.

关键词： Solid-state batteries Solid-state electrolyte artificial SEI layer Fluorination MOFs

来源：评论

学校读者我要写书评

暂无评论

Application of the hybrid integration displacement algorithm based on CEEMDAN and wavelet threshold denoising in vibration screening equipment

引用

MEASUREMENT SCIENCE AND technology 2025年第1期36卷 016194-016194页

作者： Zhou, Jiacheng Wu, Zhi Duan, Zhongwei Zhang, Libin Liu, Fang Wang, Zhen Zhao, Guochao Hu, Chao Wuhan Text Univ Hubei Key Lab Digital Text Equipment Wuhan 430073 Peoples R China Wuhan Univ Hubei Key Lab Elect Mfg & Packaging Integrat Wuhan 430072 Peoples R China Zhejiang Univ State Key Lab Silicon & Adv Semicond Mat Hangzhou 310027 Peoples R China Liaoning Tech Univ Min Hydraul Technol & Equipment Engn Res Ctr Fuxin 123000 Peoples R China Huazhong Univ Sci & Technol Sch Mech Sci & Engn Nuoyu Rd 1037 Wuhan Peoples R China

Vibration screening equipment has an extensive application profile in material screening, in which the displacement parameters can reveal the motion state of the material and affect the screening efficiency. These displacement parameters can be obtained by integrating the acceleration signal of the equipment. In this paper, to prevent the noise in the acceleration signal from further amplifying its negative effects on the subsequent integration, the acceleration signal is preprocessed by the complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN) and wavelet threshold denoising. Besides, a hybrid integration displacement algorithm is utilized to mitigate the influence of integration errors. The consistent results between simulation and platform experiments demonstrate that CEEMDAN in combination with wavelet threshold denoising can effectively remove noise while retaining the main frequency signal. In addition, the displacement signal obtained by the hybrid integration algorithm proposed in this paper is closer to the original displacement signal. Compared with the 2nd time-domain integration, the 2nd frequency-domain integration, and the empirical mode decomposition integration methods, the integration method proposed in this paper achieves a smaller peak error, mean absolute error, and root mean square error. The experimental results corroborate the superiority of this method in the application of vibration screening equipment.

关键词： hybrid integral displacement algorithm CEEMDAN wavelet threshold denoising vibration screening vibration displacement

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：