检索结果-内蒙古大学图书馆

Adaptive-Neural Finite-Time Sliding Mode Control for Quadrotor Helicopter Attitude Stabilization in Complex Environments

引用

IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS 2025年第1期61卷 1175-1185页

作者： Ullah, Mati Gao, Hongbo Nasir, Alam Wang, Yafei Wang, Chengbo Univ Sci & Technol China Sch Informat Sci & Technol Dept Automat Hefei 230022 Peoples R China Univ Sci & Technol China Inst Adv Technol Hefei 230026 Peoples R China State Key Lab Intelligent Vehicle Safety Technol Chongqing 401133 Peoples R China Nanyang Technol Univ Singapore 639798 Singapore Shanghai Jiao Tong Univ Sch Mech Engn Shanghai 200240 Peoples R China

Achieving attitude stabilization in quadrotor helicopters (qhs) operating in complex environments, characterized by external disturbances and model uncertainties, presents a significant challenge. This study presents an adaptive-neural finite-time sliding mode control (anft-smc) to effectively address these challenges. The proposed method integrates nonsingular fast terminal sliding mode control (nft-smc) with a radial basis function neural network (rbfnn), which is equipped with a fast auto-tuning law. Consequently, the method transcends qh model constraints and obviates the need for explicit knowledge of external disturbances and model uncertainties. The effectiveness of the proposed approach in stabilizing attitude dynamics is rigorously validated through a comprehensive Lyapunov stability analysis, scrutinizing key stability aspects. Extensive simulations conducted using matlab and Simulink, compared against a nominal nft-smc implementation based on a state observer (so) benchmark, demonstrate the superior performance and robustness of the proposed method in achieving finite-time stabilization of qh attitude dynamics.

关键词： Uncertainty Adaptation models Mathematical models Attitude control Sliding mode control Robustness Artificial neural networks Adaptive-neural finite-time sliding mode control (ANFT-SMC) attitude stabilization complex environment nonsingular fast terminal sliding mode control quadrotor helicopters radial basis function neural network (RBFNN) state observer (SO)

来源：评论

学校读者我要写书评

暂无评论

Enabling Further Organic Electrolyte Infiltration of Cellulose-Based Separators via Defect-Rich Polypyrrole Modification for High Sodium Ion Transport in Sodium Metal Batteries

引用

ACS APPLIED MATERIALS & INTERFACES 2024年第4期16卷 4708-4718页

作者： Deng, Shengxiang Meng, Weijia Fan, Changchun Zuo, Dapeng Han, Jun Li, Tongheng Li, Diansen Jiang, Lei Beihang Univ Sch Chem Key Lab Bioinspired Smart Interfacial Sci Technol Minist Educ Beijing 100191 Peoples R China Beijing Univ Chem Technol State Key Lab Organ Inorgan Composites Beijing 100029 Peoples R China

Sodium metal batteries (SMBs) have high-density and cost-effective characteristics as one of the energy storage systems, but uncontrollable dendrite growth and poor rate performance still hinder their practical applications. Herein, a nitrogen-rich modified cellulose separator with released abundant ion transport tunnels in organic electrolyte was synthesized by in situ polymerization of polypyrrole, which is based on the high permeability of cellulose in aqueous solution and the interfacial interaction between cellulose and polypyrrole. Meanwhile, the introduction of abundant structural defects such as branch chains, oxygen-containing functional groups, and imine-like structure to disrupt polypyrrole conjugation enables the utilization of conductive polymers in composite separator applications. With the electrolyte affinity surface on, the modified separator exhibits reinforced electrolyte uptake (254%) and extended electrolyte wettability, thereby leading to accelerated ionic conductivity (2.77 mS cm(-1)) and homogeneous sodium deposition by facilitating the establishment of additional pathways for ion transport. Benefiting from nitrogen-rich groups, the polypyrrole-modified separator demonstrates selective Na+ transport by the data of improved Na+ transference number (0.62). Owing to the above advantages, the battery assembled with the modified separators exhibits outstanding rate performance and prominent capacity retention two times that of the pristine cellulose separator at a high current density under the condition of fluorine-free electrolyte.

关键词： battery separators cellulose ion transport polypyrrole structural defects sodium metalbatteries

来源：评论

学校读者我要写书评

暂无评论

Three-dimensional heterostructured MnNiCoP/FeOOH cross-linked nano-flake supported by Ni Foam as a bifunctional electrocatalysts for overall water splitting

引用

APPLIED SURFACE SCIENCE 2024年 656卷

作者： Zhu, Longqi Wang, Runze Liu, Xuehua Yang, Shuhan Liu, Haizhen Xing, Bo Wang, Kuikui Qingdao Univ Inst Mat Energy & Environm Coll Mat Sci & Engn Lab New Fiber Mat & Modern TextGrowing Basis Stat Qingdao 266071 Peoples R China Guangxi Univ MOE Key Lab New Proc Technol Nonferrous Met & Mat Guangxi Key Lab Proc Nonferrous Met & Featured Mat Nanning 530004 Guangxi Peoples R China Sichuan Univ Sci & Engn Natl Engn Lab Circular Econ Zigong 643000 Sichuan Peoples R China Changzhou Univ Jiangsu Key Lab Adv Catalyt Mat & Technol Changzhou 213164 Jiangsu Peoples R China

The production of three-dimensional heterogeneous structures is a vital approach for the creation of high-performance bifunctional electrocatalysts. Herein, three-dimensional heterostructure MnNiCoP/FeOOH (MNC-P/FeOOH) supported by Ni foam was prepared by simple electrodeposition and phosphorylation as a bifunctional electrocatalyst. The results showed that the required overpotential for MNC-P/FeOOH catalyst to reach 100 mA cm(-2) current density was 124 mV and 251 mV in 1.0 M KOH solution, respectively. Construction of heterojunction not only improves the OER performance of MnNiCoP, but also reduces the potential required to drive the integral water splitting at 100 mA cm(-2) current density. The electrocatalytic activity of MNC-P/FeOOH is greatly increased due to a distinctive interface synergy and strong electronic contacts in the MNC-P/FeOOH heterojunction. This design approach of bifunctional transition metal phosphides provides a potential route to achieve total water splitting.

关键词： Transition metal phosphide Heterojunction Bifunctional electrocatalyst Water-splitting Interfacial synergism

来源：评论

学校读者我要写书评

暂无评论

Interfacial adsorption and chelation approaches for Long-Life aqueous Zn batteries

引用

CHEMICAL engineering JOURNAL 2024年 484卷

作者： Li, Tongheng Meng, Weijia Fan, Changchun Zuo, Dapeng Deng, Shengxiang Li, Diansen Jiang, Lei Beihang Univ Sch Chem Key Lab Bioinspired Smart Interfacial Sci Technol Minist Educ Beijing 100191 Peoples R China Beijing Univ Chem Technol State Key Lab Organ Inorgan Composites Beijing 100029 Peoples R China

Despite the advantages of high theoretical capacity and low cost, the commercialization of zinc-ion batteries (ZIBs) still faces the challenges of Zn dendrite growth and corrosion reactions. Here, chitosan (CS) is chosen as a dual-functional electrolyte additive with non-toxicity, low cost, and biodegradability features to simultaneously optimize the Zn2+ coordination structure and electrode interfacial environment. Density functional theory calculations and experimental results show that CS molecules can adsorb on the Zn electrode to form a water-poor electric double layer, inhibiting hydrogen evolution and side reactions. The specific adsorption induces preferential growth of the Zn(0 0 2) plane to form a flat and compact deposition layer. Furthermore, CS additives can decouple the original Zn(H2O)62+ structure through the chelation between CS and Zn2+, effectively reducing the water activity in ZIBs. Consequently, the Zn||Zn cells with CS electrolyte show excellent stability of 3000 h. Additionally, the Zn||MnO2 full cells show excellent stability with a capacity retention of 86.79 % after 500 cycles at 1 A g-1. This study presents a facile and feasible strategy to stabilize Zn anodes by regulating the electrode interface and solvation structure.

关键词： Chitosan Interfacial adsorption Chelation DFT calculations Zinc-ion batteries

来源：评论

学校读者我要写书评

暂无评论

Effect of ultrasonic conditions on microstructural and mechanical of Sn58Bi and Sn58Bi solder joints with 0.6 % Si3N4 nanoparticles

引用

MATERIALS CHARACTERIZATION 2025年 224卷

作者： Deng, Kai Zhang, Liang Gao, Li-Li Zhao, Meng Zhang, Xiao-Bin Chen, Mo Yu, Xin-Quan Lu, Quan-Bin Sun, Lei Xiamen Univ Technol Sch Mat Sci & Engn Xiamen 361024 Peoples R China Shanghai Inst Radio Equipment Shanghai 200090 Peoples R China Zhengzhou Res Inst Mech Engn State Key Lab Adv Brazing Filler Met & Technol Zhengzhou 450001 Peoples R China Changzhou Univ Sch Mech Engn & Rail Transit Changzhou 213164 Peoples R China

This study used ultrasonic time as a variable to test Sn58Bi and Sn58Bi solder joints with 0.6 % Si3N4 nanoparticles. Ultrasound was applied to the solder joints for 0, 5, 10, and 15 s to observe how the microstructural and mechanical properties changed in the solder joints. It was found that the microstructure of the solder joint became more uniform with increasing ultrasonic time, and the thickness of the IMC increased after the application of ultrasound. Compared with Sn58Bi, the IMC of Sn58Bi-0.6Si3N4 was thicker. The IMC became more uniform when the ultrasonic time reached 15 s. In the absence of ultrasonic treatment, the solder still contained large particles, but with the increase in ultrasonic time, the grains became smaller. The shear strength increased with increasing ultrasonic time, reaching a maximum at 15 s of ultrasonic treatment. Compared to Sn58Bi, Sn58Bi-0.6Si3N4 had smaller particles and higher shear strength in its solder joints for the same ultrasonic time. The maximum shear strength reached 58.50 MPa at 15 s of ultrasonic time.

关键词： Intermetallic compounds Ultrasound Mechanical properties Sn58Bi solder Si 3 N 4 nanoparticles

来源：评论

学校读者我要写书评

暂无评论

INCREASING AMPLITUDE AT LOW TEMPERATURES TO OBTAIN 90W-7Ni-3Fe REFRACTORY ALLOY WITH EXCELLENT CORROSION RESISTANCE PREPARED BY HOT OSCILLATORY PRESSING

引用

POWDER METALLURGY AND METAL CERAMICS 2024年第5-6期63卷 272-279页

作者： Hu, Yanghu Gao, Ka Li, Qiang Ren, Chunyang Sun, Dejian Gao, Yang Dang, Li Guo, Biao China Natl Heavy Machinery Res Inst Co Ltd State Key Lab Met Extrus & Forging Equipment Techn Xian 710000 Peoples R China Univ Shanghai Sci & Technol Sch Mech Engn Shanghai 200093 Peoples R China Mat Corros & Protect Key Lab Sichuan Prov Zigong 643000 Peoples R China Zhengzhou Univ Aeronaut Sch Mat Sci & Engn Zhengzhou 450015 Peoples R China Xihua Univ Sch Mat Sci & Engn Key Lab Mat & Surface Technol Minist Educ Chengdu 610039 Sichuan Peoples R China

90W-7Ni-3Fe refractory alloy with high density and excellent corrosion resistance was obtained for the first time by hot oscillating pressure (HOP) under different oscillating amplitudes (5, 10, and 15 MPa) at low temperatures (1000 degrees C). As the amplitude increased, the 15 MPa sintered sample reached the maximum density of 99.4% with an average grain size of 3.41 mu m by min-grain growth rate (about two-thirds of 5 MPa sintered sample), and the max-Vickers hardness reached 462.3 HV0.5. The sintering curve was changed gently and presented full density at the end of the isothermal holding period. More importantly, the corrosion current density icorr was reduced by nearly 1.07 times, and the corrosion resistance of 15 MPa samples was better than that of 5 MPa and 10 MPa samples and similar materials ever reported. The results show that the increase of amplitude is beneficial to the densification of refractory tungsten alloy and has a positive effect on improving the density, hardness, corrosion resistance and inhibiting the growth of grain size (the retention of the fine-grained microstructure) at low temperatures.

关键词： hot oscillating pressing refractory alloy hardness densification corrosion

来源：评论

学校读者我要写书评

暂无评论

Numerical simulation and experimental study of residual stress in dissimilar aluminum alloy laser composite welding

引用

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS 2024年第6期238卷 1155-1163页

作者： Chen, Xiaowen Tang, Song Xie, Wanlin Zhang, Meng Song, Hao Ran, Qingzheng Zhang, Defen Zeng, Dezhi Southwest Petr Univ State Key Lab Oil & Gas Reservoir Geol & Exploitat Chengdu 610500 Sichuan Peoples R China Southwest Petr Univ Sch New Energy & Mat Chengdu 610500 Sichuan Peoples R China

The study combined experimental and numerical simulation methods to investigate the distribution of residual stress in laser composite welding of dissimilar aluminum alloys 6063 and 5083. Using the Simufact Welding simulation software and a combined volume heat source, the distribution patterns of transverse and longitudinal residual stress fields at different welding speeds were analyzed. The blind hole method was used to test the residual stress after welding. The results showed that the use of a combined volume heat source model for heat source calibration yielded ideal results, and the thermal cycle curve was basically consistent with the simulation and experimental results of residual stress. As the welding speed decreased, the longitudinal residual stress of the parent material on both sides significantly decreased, while the transverse residual stress increased. The majority of tensile and compressive stresses on both sides of the 5083 and 6063 aluminum alloys decreased with a decrease in welding speed. The Von Mises equivalent stress indicated that the cooling process is the main stage for residual stress generation. When the welding speed decreased, the peak value of longitudinal residual stress on the 6063 aluminum alloy side decreased from 230 to 90 MPa, while that on the 5083 aluminum alloy side decreased from 304 to 150 MPa. These findings provide an important basis for controlling and reducing the residual stress and deformation of dissimilar aluminum alloy laser arc composite welded components.

关键词： Dissimilar aluminum alloy laser arc recombination residual stress numerical simulation heat source calibration

来源：评论

学校读者我要写书评

暂无评论

Interface modification and crystallization control of efficient and stable perovskite solar cells using dicyandiamide

引用

JOURNAL OF MATERIALS CHEMISTRY A 2025年第18期13卷 13542-13550页

作者： Tao, Ruicheng Wu, Tiao Ji, Wenxi Chen, Qiaoyun Zhang, Zelong Rui, Dong Dong, Bin Zhou, Yi Song, Bo Soochow Univ Coll Chem Chem Engn & Mat Sci Lab Adv Optoelect Mat Suzhou Key Lab Novel Semicond Optoelect Mat & Devi Suzhou 215123 Peoples R China Chem Ind China Petr & Chem Corp Beijing Res Inst Beijing 100013 Peoples R China Suzhou Key Lab Novel Semicond Optoelect Mat & Devi Lab Adv Optoelect Mat Suzhou Peoples R China

Tin dioxide (SnO2) is a promising electron transport material for perovskite solar cells (Pero-SCs), but its intrinsic defects, mainly dangling bonds, accelerate degradation of perovskite layers. To address this, we utilized dicyandiamide (DCD), a small molecule featuring bifunctional groups -NH2 and -CN, as an interfacial modification layer. The introduction of DCD not only effectively passivated SnO2 defects through DCD's -CN groups, thereby improving the arrangement of interface energy level and the conductivity of the SnO2 film, but also facilitated the formation of high-quality perovskite films at the newly created buried interface in n-i-p solar cells, attributed to the ameliorating influence of DCD's -NH2 groups. Consequently, the power conversion efficiency (PCE) of the corresponding Pero-SCs was substantially improved from 21.28% to 24.50% upon DCD incorporation. Moreover, unencapsulated devices demonstrated enhanced stability, retaining 93.2% of their initial PCE after 720 hours of storage at controlled humidity (RH = 30-40%).

关键词： Tin dioxide

来源：评论

学校读者我要写书评

暂无评论

Deep-eutectic solvent extraction of ginsenosides and ginseng polysaccharides from ginseng residue and utilization of post-extraction residue

引用

PROCESS BIOCHEMISTRY 2025年 149卷 99-110页

作者： Guan, Zhaofeng Zhou, Lina Wu, Hao Chu, Zhenyu Liu, Mingjun Zhou, Jun Nanjing Tech Univ Bioenergy Res Inst Coll Biotechnol & Pharmaceut Engn Nanjing 211816 Jiangsu Peoples R China Nanjing Tech Univ State Key Lab Mat Oriented Chem Engn Nanjing 211816 Jiangsu Peoples R China Changzhou Beijiao Sr High Sch Changzhou 213031 Jiangsu Peoples R China

In this study, ginsenosides and polysaccharides were extracted from ginseng residue (GR) using a green method combining deep eutectic solvent (DES) and ultrasound. The results showed that the optimal extraction conditions of ginsenosides optimized by orthogonal test were choline chloride/propionic acid ratio of 1:3, moisture content of 30 %, solid-liquid ratio of 1:25, and ultrasound time of 30 min, which resulted in the yield of ginsenosides of 36.76 +/- 1.46 mg/g, and improved the efficiency by 218.27 % compared with that of the traditional 70 % ethanol extraction method. The ginseng polysaccharides obtained by further purification of the extract showed different in vitro antioxidant activities, with scavenging rates of 91.2 %, 98.3 %, and 96.4 % for hydroxyl radicals, DPPH, and superoxide radicals, respectively, and Fe(II) chelating activity at 93.5 %. The extracted GR showed good adsorption properties for glucose, sodium nitrite, cholesterol, and sodium cholate by in vitro adsorption tests with adsorption rates of 60 %, 93.3 %, 87.05 %, and 72.95 %, respectively. In conclusion, the use of DES as an extraction solvent has certain application prospects for GR reuse.

关键词： DES Ginseng residue Ginseng polysaccharide Ginsenoside

来源：评论

学校读者我要写书评

暂无评论

Degradation of Organic Dyes Using the Ionizing Irradiation Process in the Presence of the CN/CD3/Fe6 Composite: Mechanistic Studies

引用

ACS OMEGA 2022年第25期7卷 21418-21432页

作者： Li, Wen Ye, Qi Xia, Tao Zhao, Long Yang, Miao Wuhan Univ Technol Sch Chem Chem Engn & Life Sci Wuhan 430070 Peoples R China Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China

Organic dyes are ubiquitous pollutants in various aquatic environments as they are produced in abundance and used widely. In the present work, the degradation and mineralization of various organic dyes such as methylene blue (MB), methyl orange (MO), and rhodamine B (RhB), following the electron beam irradiation method in the presence of a graphitic carbon nitride/carbon nanodots/ Fe(II) (CN/CD3/Fe-6) composite, were studied. The removal efficiency of MB reached 81.7% under conditions of electron beam irradiation (EBI) when the total irradiation dose was 5 kGy. This increased to 91.2% in the presence of the CN/ CD3/Fe-6 composite. The mineralization efficiency increased from 30.1 to 47.3% when the composite was added, and the total irradiation dose was 20 kGy. The removal efficiency of organic dyes was not significantly affected in the pH range of 3-11. Results from cyclic experiments conducted using MB degradation indicated that the CN/CD3/Fe-6 composite exhibited good stability and reusability even after five irradiation cycles. Results from scavenging experiments revealed that center dot OH was the predominant reactive species during the MB degradation process. Intermediates produced in the synergistic system (EBI&CN/CD3/Fe-6 system) consisting of the CN/CD3/Fe-6 composite and EBI were detected using the liquid chromatography-mass spectrometry (LC-MS) technique. Based on the results, the possible degradation mechanism and pathways for MB were proposed.

关键词：

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：