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Research progress of defect-engineered UiO-66(Zr) MOFs for photocatalytic hydrogen production
《能源前沿(英文)》 2021年 第15卷 第3期 页码 656-666 doi: 10.1007/s11708-021-0765-9
关键词: defect engineering metal-organic frameworks UiO-66 photocatalysis
Acoustic fault signal extraction via the line-defect phononic crystals
《机械工程前沿(英文)》 2022年 第17卷 第1期 页码 10-10 doi: 10.1007/s11465-021-0666-y
关键词: phononic crystals line-defect fault signal extraction acoustic enhancement
The defect-length effect in corrosion detection with magnetic method for bridge cables
Qiwei ZHANG, Rongya XIN
《结构与土木工程前沿(英文)》 2018年 第12卷 第4期 页码 662-671 doi: 10.1007/s11709-018-0512-4
Quantitative evaluation of the steel corrosion in cables is significant for the safe operation of cable-supported bridges. The magnetic flux (MF) examination shows great potential to detect the corrosion defect, or loss of metallic cross-sectional area (LMA). An LMA defect in steel cables can be measured accurately when it is longer than a certain length. However, for defects in early stage, where the length of corrosion area is short, the MF examination may produce unacceptable error. In this study, the effect of defect length on the MF examination for corrosion detection of bridge cables is investigated through theoretical analysis and model experiments. An original analytical model to quantify the influence of defect length is proposed based on the equivalent magnetic circuit method. Then, MF examination experiments are performed on a series of cable models with different defect lengths and locations to verify the analytical model. Further, parameter study is conducted based on the proposed analytical model to clarify the mechanism of the defect-length effect. The results show that the area loss caused by short corrosion damage will be underestimated if the defect-length effect is neglected, and this effect can be quantified efficiently with the proposed analytical model.
关键词: bridge cable corrosion detection defect length MF examination quantitative evaluation
Single-electromagnet levitation for density measurement and defect detection
Yuhan JIA, Peng ZHAO, Jun XIE, Xuechun ZHANG, Hongwei ZHOU, Jianzhong FU
《机械工程前沿(英文)》 2021年 第16卷 第1期 页码 186-195 doi: 10.1007/s11465-020-0608-0
关键词: single-electromagnet electromagnetic levitation density measurement defect detection
Nitin NAMPALLI,Tsun Hang FUNG,Stuart WENHAM,Brett HALLAM,Malcolm ABBOTT
《能源前沿(英文)》 2017年 第11卷 第1期 页码 4-22 doi: 10.1007/s11708-016-0442-6
关键词: Czochralski silicon boron-oxygen defect injection dependent lifetime spectroscopy goodness-of-fit repeatability error
郭成超,许朋飞,崔璨
《中国工程科学》 2017年 第19卷 第6期 页码 38-43 doi: 10.15302/J-SSCAE-2017.06.006
在桥梁的全生命周期中,桥面板是最容易出现病害的部分。桥面铺装层常常由于施工方法选择不当、混凝土老化、钢筋锈蚀等原因产生各种病害,这对桥梁结构、使用性能都会造成不利影响,因此有必要对相关病害进行检测,并对桥面质量做出相关评价。本文介绍了国内外四种主要无损检测方法(半电池电位法、探地雷达法、冲击回波法、红外热成像法)的工作原理以及相应的检测设备,利用其中一种或几种方法能准确评估桥面板的恶化情况,对桥面板状况进行快速、无损检测,为实现桥面铺装的准确检测提供技术支持,从而减少结构病害,延长桥梁的使用寿命。
Effect of cavity defect on the triaxial mechanical properties of high-performance concrete
Yanbin ZHANG; Zhe WANG; Mingyu FENG
《结构与土木工程前沿(英文)》 2022年 第16卷 第5期 页码 600-614 doi: 10.1007/s11709-022-0821-5
关键词: high-performance concrete cavity conventional triaxial compression pressurized liquid modified power-law criterion
《化学科学与工程前沿(英文)》 2023年 第17卷 第4期 页码 449-459 doi: 10.1007/s11705-022-2226-3
关键词: UiO-66/MoSe2 photocatalysis dye-containing wastewater heavy metal wastewater oxygen vacancies
一种面向软件缺陷预测的相似性度量特征选择方法 Article
Qiao YU, Shu-juan JIANG, Rong-cun WANG, Hong-yang WANG
《信息与电子工程前沿(英文)》 2017年 第18卷 第11期 页码 1744-1753 doi: 10.1631/FITEE.1601322
Detection for transverse corner cracks of steel plates’ surface using wavelet
Qiong ZHOU, Qi AN
《机械工程前沿(英文)》 2009年 第4卷 第2期 页码 224-227 doi: 10.1007/s11465-009-0017-x
关键词: transverse corner cracks defect detection multi-scales wavelet analysis
种基于特征选择与迁移学习的度量补偿软件缺陷预测方法 Research Article
陈锦富1,2,王小丽1,2,蔡赛华1,2,徐家平1,陈静怡1,陈海波1
《信息与电子工程前沿(英文)》 2022年 第23卷 第5期 页码 715-731 doi: 10.1631/FITEE.2100468
关键词: 缺陷预测;特征选择;迁移学习;度量补偿
The role of ions in plasma catalytic carbon nanotube growth: A review
Erik C. Neyts
《化学科学与工程前沿(英文)》 2015年 第9卷 第2期 页码 154-162 doi: 10.1007/s11705-015-1515-5
关键词: plasma-enhanced chemical vapor deposition (PECVD) carbon nanotube (CNT) ion bombardment defect healing
Detection of solder bump defects on a flip chip using vibration analysis
Junchao LIU, Tielin SHI, Qi XIA, Guanglan LIAO
《机械工程前沿(英文)》 2012年 第7卷 第1期 页码 29-37 doi: 10.1007/s11465-012-0314-7
Flip chips are widely used in microelectronics packaging owing to the high demand of integration in IC fabrication. Solder bump defects on flip chips are difficult to detect, because the solder bumps are obscured by the chip and substrate. In this paper a nondestructive detection method combining ultrasonic excitation with vibration analysis is presented for detecting missing solder bumps, which is a typical defect in flip chip packaging. The flip chip analytical model is revised by considering the influence of spring mass on mechanical energy of the system. This revised model is then applied to estimate the flip chip resonance frequencies. We use an integrated signal generator and power amplifier together with an air-coupled ultrasonic transducer to excite the flip chips. The vibrations are measured by a laser scanning vibrometer to detect the resonance frequencies. A sensitivity coefficient is proposed to select the sensitive resonance frequency order for defect detection. Finite element simulation is also implemented for further investigation. The results of analytical computation, experiment, and simulation prove the efficacy of the revised flip chip analytical model and verify the effectiveness of this detection method. Therefore, it may provide a guide for the improvement and innovation of the flip chip on-line inspection systems.
关键词: flip chip defect detection ultrasonic excitation vibration analysis
《化学科学与工程前沿(英文)》 2023年 第17卷 第1期 页码 93-101 doi: 10.1007/s11705-022-2175-x
关键词: g-C3N4 nitrogen defect sulfur doping photodegradation plasma
程学武,许维青,杨志永
《中国工程科学》 2010年 第12卷 第12期 页码 89-93
总结了北京地下直径线工程大直径盾构管片拼装技术,初步分析了大直径盾构钢筋混凝土管片施工过程中的表观破损原因,并对破损管片修补技术进行探讨,提出对拱腰以上、拱腰以下部位管片的不同修补方法,保证了大直径盾构管片的强度及外观质量。
标题 作者 时间 类型 操作
The defect-length effect in corrosion detection with magnetic method for bridge cables
Qiwei ZHANG, Rongya XIN
期刊论文
Single-electromagnet levitation for density measurement and defect detection
Yuhan JIA, Peng ZHAO, Jun XIE, Xuechun ZHANG, Hongwei ZHOU, Jianzhong FU
期刊论文
Statistical analysis of recombination properties of the boron-oxygen defect in p-type Czochralski silicon
Nitin NAMPALLI,Tsun Hang FUNG,Stuart WENHAM,Brett HALLAM,Malcolm ABBOTT
期刊论文
Effect of cavity defect on the triaxial mechanical properties of high-performance concrete
Yanbin ZHANG; Zhe WANG; Mingyu FENG
期刊论文
Construction of defect-containing UiO-66/MoSe heterojunctions with superior photocatalytic performance
期刊论文
Detection for transverse corner cracks of steel plates’ surface using wavelet
Qiong ZHOU, Qi AN
期刊论文
Detection of solder bump defects on a flip chip using vibration analysis
Junchao LIU, Tielin SHI, Qi XIA, Guanglan LIAO
期刊论文
Tuning nitrogen defects and doping sulfur in carbon nitride for enhanced visible light photocatalytic activity
期刊论文