检索结果-内蒙古大学图书馆

河南师范大学学报（自然科学版） 2023年第4期51卷 84-92页

作者：魏明军陈钊纪占林周太宇闫旭文刘铭华北理工大学人工智能学院河北唐山063210 华北理工大学河北省工业智能感知重点实验室河北唐山063210

针对有花镀层钢板表面缺陷检测过程中由于锌花底纹干扰导致缺陷识别率低的问题,提出一种以目标检测算法YOLOv5s为基础并通过引入通道注意力机制和金字塔卷积网络的Spangles Texture Interference-YOLO(STI-YOLO)算法模型.根据缺陷数据... 详细信息

针对有花镀层钢板表面缺陷检测过程中由于锌花底纹干扰导致缺陷识别率低的问题,提出一种以目标检测算法YOLOv5s为基础并通过引入通道注意力机制和金字塔卷积网络的Spangles Texture Interference-YOLO(STI-YOLO)算法模型.根据缺陷数据集重新聚类,优化先验框;在特征融合网络PANet之前引入通道注意力机制SENet,抑制锌花背景的干扰;在预测网络之前添加金字塔卷积网络,取得更加丰富的上下文特征.实验结果表明,STI-YOLO模型提升了带钢表面缺陷的检测精度,平均精度均值mAP达到了95.79%,较YOLOv3、YOLOv4和YOLOv5s算法分别提高了13.13个百分点、14.59个百分点和2.07个百分点.检测速度为54.14 frame/s,满足实时性要求,可见STI-YOLO模型具有较好的检测性能.

关键词：缺陷检测特征融合注意力机制多尺度特征锌花背景干扰

来源：评论

学校读者我要写书评

暂无评论

基于磁控制的双谐振腔LLC谐振变换器

引用

电子器件 2022年第3期45卷 551-556页

作者：郑宏严序文袁雪凯秦润田尤涛江苏大学电气信息工程学院江苏镇江212013

LLC谐振变换器可以实现原边开关管的零电压开通和副边整流管的零电流关断,变换效率较高,但传统的LLC谐振变换器具有输入电压范围不宽、且在宽输入电压范围下效率较低的缺点。针对这个缺点,本文在拓扑和控制方法上做出改进,提出了一种利... 详细信息

LLC谐振变换器可以实现原边开关管的零电压开通和副边整流管的零电流关断,变换效率较高,但传统的LLC谐振变换器具有输入电压范围不宽、且在宽输入电压范围下效率较低的缺点。针对这个缺点,本文在拓扑和控制方法上做出改进,提出了一种利用磁控制的可变电感来实现定频模式下输出电压控制与调节的全桥双谐振腔LLC变换器,在没有牺牲效率的前提下,拓宽了输入电压的范围。并且制作了一台输入为120 V~400 V,输出为48 V/5 A的实验样机,验证了理论分析的正确性。

关键词： LLC谐振变换器磁控制双谐振宽输入电压高效率

来源：评论

学校读者我要写书评

暂无评论

Microstructure, mechanical and neutron shielding properties of aluminum borate ceramics obtained from alumina and boric acid

引用

JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY 2024年第3期60卷 905-915页

作者： Lao, Dong Zhang, yan Huang, Lingfeng Liang, xuwen Jia, Wenbao Nanjing Univ Aeronaut & Astronaut NUAA Dept Nucl Sci & Technol Nanjing 211106 Peoples R China East China Univ Technol Engn Res Ctr Nucl Technol Applicat Minist Educ Nanchang 330013 Peoples R China Jiangsu Higher Educ Inst Collaborat Innovat Ctr Radiat Med Suzhou 215006 Peoples R China

In this study, a series of aluminum borate ceramics (ABCs) with needle-like whiskers were obtained using a low-cost, solid-state, pressureless sintering ceramic route, without any additives during the preparation process. The effects of different alumina/boric acid molar ratios and sintering temperatures on the phase composition, microstructure, mechanical properties, specific surface area, pore size distribution, and sub-cadmium neutron shielding properties of ABCs were studied using orthogonal experiments. It was observed that pure phase aluminum borate (Al18B4O33) ceramics could be obtained at 1100 degree celsius, forming a mass of needle-like whiskers. The whiskers' aspect ratio, fracture work, specific surface area, and pore size distribution of ABCs are maximized when ABCs are sintered at 1100 degree celsius with 9:6 alumina/boric acid molar ratio. In this condition, ABCs (0.5 cm) can shield 70% of sub-cadmium neutrons (E<0.4 eV). These findings demonstrate the great potential of aluminum borate ceramics for neutron shielding applications.

关键词： Aluminum borates ceramics (ABCs) Solid-state reaction synthesis Al18B4O33 whiskers Mechanical properties Sub-cadmium neutron shielding capacity

来源：评论

学校读者我要写书评

暂无评论

Dynamic simulation on multilevel coupled vibration of a naval gun under foundation motion excitation of ship

引用

ALEXANDRIA ENGINEERING JOURNAL 2024年 107卷 347-358页

作者： Chen, Yu Xie, Mingliang Zou, Xiaofeng Liu, Jinfeng yan, Dejun Jing, xuwen Jiangsu Univ Sci & Technol Sch Mech & Engn Zhenjiang 212100 Peoples R China CSSC Huangpu Wenchong Shipbldg Co Ltd Guangdong Prov Key Lab Adv Welding Technol Ships Guangzhou 510720 Peoples R China

To study the multilevel coupled vibration of a naval gun under the foundation motion excitation of the ship, a mechanical-electrical-hydraulic coupled dynamic model of the naval gun including the follow-up systems' influence was established. The subprogram for calculating the ship foundation motion was written by the harmonic superposition method, and the motion in the 3 and 5-scale sea waves was reconstructed, respectively. Based on the multidisciplinary simulation, the transmission characteristics of the ship's foundation motion excitation along the naval gun and the influence of the tooth arc arrangement on the stabilization accuracy of the naval gun are analyzed. The results show that: the foundation motion excitation of the ship will aggravate the imbalance of the contact forces at the left and right trunnions of the cradle. A bilateral symmetrical arrangement scheme of the tooth arcs can reduce the contact forces' imbalance at the trunnions and reduce the adverse influence on the stabilization accuracy of the naval gun. The relevant research provides theoretical support and technical guidance for the structural design or verification of the naval gun.

关键词： Naval gun Wave excitation Follow-up system Co-simulation Stabilization accuracy

来源：评论

学校读者我要写书评

暂无评论

Influence of initial microstructure on surface integrity of ultrasonic impacting strengthened 34CrNi3MoA steel crankshaft

引用

JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 2024年第2期38卷 683-689页

作者： Chen, Jianzhi Zhuge, Yunhai Ren, Hailiang Jing, xuwen Wang, yan Li, Guochao Jiangsu Univ Sci & Technol Sch Mech Engn Zhenjiang 212003 Peoples R China Henan Diesel Engine Heavy Ind Co Ltd Luoyang 471039 Peoples R China

The ultrasonic impacting process was carried out on the fillet of 34CrNi3MoA steel crankshaft treated by quenching and tempering, medium frequency quenching and gas nitriding respectively, and the variations of surface integrity of crankshaft were analyzed. The results show that the Ra of fillet can be decreased to below 0.2 mu m after the ultrasonic impacting. The ultrasonic impacted crankshaft with initial process of gas nitriding has the highest hardness but the lowest hardness increase rate due to its high deformation resistance of nitriding layer. The ultrasonic impacting can transfer the tensile residual stress to the compressive residual stress on the fillet, the specimens with initial process of gas nitriding exhibit the highest compressive residual stress of -412.17 MPa. The fatigue performance model of the crankshaft was established based on Basquin and Goodman equations, the crankshaft treated by gas nitriding and ultrasonic impacting is supposed to have the highest fatigue limit.

关键词： 34CrNi3MoA steel Crankshaft Fatigue performance Ultrasonic impacting Surface integrity

来源：评论

学校读者我要写书评

暂无评论

Effect of High-Temperature Annealing on Microstructure and Mechanical Properties of Extremely Deformed Fe35Ni35Cr20Mn10 High-Entropy Alloy Wire

引用

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 2025年第1期34卷 885-895页

作者： Shi, Mengchuan Liao, Hengcheng Zhou, Jun Li, Guangjing Cui, Zhan yan, Tianrui Liu, xuwen Southeast Univ Sch Mat Sci & Engn Jiangsu Key Lab Adv Met Mat Nanjing 211189 Peoples R China Jiangsu Univ Sci & Technol Sch Mat Sci & Engn Zhenjiang 212100 Peoples R China

Fe35Ni35Cr20Mn10 high-entropy alloy wire with a diameter of 0.45 mm, prepared by continuous cold-drawing from a rod with a diameter of 6.34 mm, was subjected to high-temperature annealing at 600, 700, 800, 900, and 1000 degrees C for 1 h. The microstructure and mechanical properties in different states were investigated by microscopy observations and tensile testing. The wire in the as-drawn state exhibited the highest strength but the lowest elongation because of its fine multilayer structure and high dislocation density. Annealing, particularly at higher temperatures, considerably reduced the yield strength and caused significant recovery in both the elongation and strain-hardening exponent. Increasing the annealing temperature significantly decreased the dislocation density, notably coarsened the recrystallized grains, and significantly increased the fraction of twin boundaries and mean widths of annealing twins. The yield strength was found to be positively related to the dislocation density, and the elongation exhibited a negative relationship. In addition to the decrease in dislocation density, the formation of annealing twins played an important role in enhancing the elongation.

关键词： cold drawing high-entropy alloy wire high-temperature annealing mechanical properties microstructure

来源：评论

学校读者我要写书评

暂无评论

Energetic metal salts based on 3-cyano-1,5-(5-nitro-1,2,4-triazolyl) formazan: Synthesis, crystal structure, thermal stability, and catalysis on the thermal decomposition of ammonium perchlorate

引用

STRUCTURAL CHEMISTRY 2025年 1-11页

作者： Xia, Jianglu Zhang, Guojie Li, Bin Duan, xuwen yan, Biao Sha, Kailei Pei, Chonghua Wu, Bo Southwest Univ Sci & Technol State Key Lab Environm Friendly Energy Mat Mianyang 621000 Peoples R China Luzhou North Chem Ind Co Ltd Luzhou Peoples R China

Ammonium perchlorate (AP) serves as an important component in solid propellants. Adding catalysts to facilitate its thermal decomposition can enhance the combustion performance of solid propellants. Inspiring by the remarkable thermal stability and resistance to mechanical stimuli of the 3-cyano-1,5-(5-nitro-1,2,4-triazolyl) formazan, four energetic metal salts with 3-cyano-1,5-(5-nitro-1,2,4-triazolyl) formazan as energy storage units were synthesized and well characterized. The molecular structures of the compounds 1-2 were confirmed by single-crystal X-ray diffraction. The thermal behaviors and sensitivities of these new four energetic metal salts were determined by the differential scanning calorimetry (DSC) and BAM methods. These new four energetic metal salts possess excellent thermal stability with decomposition peak temperatures over 259 degrees C and low impact and friction sensitivity (IS > 40 J, FS > 360 N). Additionally, the four energetic metal salts exhibited outstanding performance in accelerating the thermal decomposition of AP, the high-temperature peak decreased by 30 to 120 degrees C, and the heat release increased significantly, which was 1.1 to 2.8 times of pure AP. The decomposition activation energy (E-a) of pure AP and AP with 10 wt% compounds 1-4 were calculated using the Kissinger equations, respectively. The AP decomposition activation energy decreased by 9.41 to 18.45 kJmol(-1). These experimental results indicate that the four energetic metal salts are expected to be the alternative additives to accelerate the catalytic decomposition of AP in composite solid propellants.

关键词： Energetic metal salts 3-Cyano-1,5-(5-nitro-1,2,4-triazolyl) formazan Thermal properties Low sensitivity Ammonium perchlorate

来源：评论

学校读者我要写书评

暂无评论

Research on the three-dimensional visual management and control for marine intelligent mould bed based on digital twin

引用

SHIPS AND OFFSHORE STRUCTURES 2024年第6期19卷 756-768页

作者： Zhou, Honggen yan, Zhanghui Jing, xuwen Chen, Yu Liu, Jinfeng Zou, Xiaofeng Kang, Chao Li, Bingqiang Xie, yang yan, Dejun Jiangsu Univ Sci & Technol Sch Mech Engn Zhenjiang Peoples R China CSSC Huangpu Wenchong Shipbuilding Co Ltd Guangdong Prov Key Lab Adv Welding Technol Ships Guangzhou Peoples R China Jiangsu Univ Sci & Technol Sch Mech Engn Zhenjiang 212100 Jiangsu Peoples R China

Mould bed is crucial for supporting the ship subsection and controlling its deformation during shipbuilding. However, its visualisation and control process intelligence are often inadequate, leading to reduced accuracy and efficiency in ship subsection construction. Aiming at the problem, a three-dimensional (3D) visual monitoring method for the marine intelligent mould bed is proposed based on digital twin, and the overall framework of the management and control system is designed. Meanwhile, a fuzzy PID control principle optimised by the genetic algorithm is proposed to better control the deformation of the ship subsection. On this basis, the verification of the developed system is carried out based on the physical intelligent mould bed, and the 3D visual management and control of the marine intelligent mould bed are realised. It provides a foundation for improving the accuracy and efficiency of ship subsection construction.

关键词： Digital twin intelligent mould bed management and control system visual monitoring adaptive control

来源：评论

学校读者我要写书评

暂无评论

TMEM35B as a novel biomarker for diagnosing gliomas

引用

BIOMARKERS IN MEDICINE 2024年第24期18卷 1103-1111页

作者： Liang, Gongbo Lai, xuwen yan, Guangning He, Wenyuan Su, Longjun Luo, Jinxia Wang, Zhuocai Gen Hosp Southern Theater Command Dept Pathol 111 LiuHua Rd Guangzhou 510010 Peoples R China

AimsThere is little information about transmembrane protein 35B (TMEM35B) expression in glioma, and its functions in glioma remains no *** & MethodsImmunohistochemistry was used to measure TMEM35B expression levels and CCK8 and Transwell assays were analyzed the proliferative and migratory and ***35B protein was significantly higher in gliomas and correlated with a higher tumor TNM stages. Receiver operating characteristic curve analysis revealed that TMEM35B had high diagnostic value in distinguishing among glioma, normal tissues, tumor stages III+IV, and I+II. Additionally, TMEM35B knockdown inhibited the proliferative, migratory, and invasive capacities of glioma ***35B expression is upregulated in gliomas, and its knockdown hinders tumor progression, highlighting the protein as a potential biomarker for glioma diagnosis.

关键词： Glioma TMEM35B proliferation metastasis biomarker

来源：评论

学校读者我要写书评

暂无评论

Mechanistic insights into the selective photocatalytic degradation of dyes over TiO_(2)/ZSM-11

引用

Frontiers of Environmental Science & Engineering 2023年第8期17卷 127-136页

作者： Zhou Zhang Kai Huo Tingxuan yan xuwen Liu Maocong Hu Zhenhua Yao Xuguang Liu Tao Ye Department of Chemical Engineering Jianghan UniversityWuhan 430056China College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China Department of Civil and Environmental Engineering South Dakota School of Mines and TechnologyRapid CitySD 57701USA State Key Laboratory of Precision Blasting Jianghan UniversityWuhan 430056China

Photocatalytic degradation is a promising way to eliminate dye *** this work,a series of TiO2/ZSM-11(TZ)nanocomposites were prepared using a facile solid state dispersion *** orange(MO),methylene blue(MB),and rhodamine B(RhB)were intentionally chosen as target substrates in the photocatalytic degradation *** to pristine TiO2,negative effect was observed on MO degradation while promoted kinetics were collected on MB and RhB over TZ ***,a much higher photocatalytic rate was interestingly achieved on RhB than MB,which indicated that a new factor has to be included other than the widely accepted electrostatic interaction mechanism to fully understand the selective photodegradation *** characterizations showed that TiO2 and ZSM-11 physically mixed and maintained both the whole framework and local structure without chemical *** different trends observed in surface area and the photo-absorption ability of TZ composites with reaction performance further excluded both as the promotion ***,adsorption energies predicted by molecular dynamics simulations suggested that differences in the adsorption strength played a critical *** work provided a deep mechanistic understanding of the selective photocatalytic degradation of dyes reactions,which helps to rationally design highly efficient photocatalysts.

关键词： Selective dye degradation Photocatalysis TiO2 ZSM-11 Chemisorption

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：