Search

Your search keyword '"Cheng, Tonglei"' showing total 189 results
Start Over Author "Cheng, Tonglei" Search Limiters Full Text
189 results on '"Cheng, Tonglei"'

11. Towards full mid-infrared supercontinuum generation with tapered chalcogenide-glass rods

Author

Serrano Esteban, Bailleul Damien, Désévédavy Frédéric, Nakatani Asuka, Cheng Tonglei, Ohishi Yasukate, Kibler Bertrand, and Smektala Frédéric

Subjects
Physics, QC1-999
Abstract

We experimentally demonstrate that simple tapered Ge-Se-Te glass rods with femtosecond pumping enables efficient multi-octave mid-infrared supercontinuum generation, from 1.7 to 16 µm, while keeping an excellent spatial beam profile.

Published
2023
Full Text
View/download PDF

13. The effect of offset distance on dynamic fracture behavior of PMMA with double cracks

Author

Yang Liyun, Zhang Yongjin, Sun Jinchao, Liu Ning, Cheng Tonglei, and Chen Qifan

Subjects
pmma, caustics method, double cracks, dynamic stress intensity factor, Engineering geology. Rock mechanics. Soil mechanics. Underground construction, TA703-712, Mining engineering. Metallurgy, TN1-997
Abstract

The influence of offset crack on dynamic impact fracture behavior is studied using the digital-leaser dynamic caustics system in conjunction with impact loading device. An inner mother crack along loading direction and its offset edge crack in PMMA were employed. The initiation and propagation behavior, as well as the caustics patterns of both cracks are observed. Some important dynamic fracture parameters of mother crack, such as the initiation time, maximum speed and dynamic stress intensity factor, are analyzed with different offset distance. The results show that the radio of crack spacing to crack offset distance is virtually important to the initiation time and maximum speed of mother crack, which are also influenced by the location of both cracks in the midline of the specimen. Moreover, the changes of dynamic intensity factor of mother cracks with different crack spacing are found to be similar, while the time of their maximum values are quite different.

Published
2017

16. A Multifunctional and Waterproof Wearable Microneedle Piezoresistive Sensor Based on CNT/CB/PDMS With Wide Temperature Range

Author

Yang, Ning, Yin, Xiangyu, Liu, Hailian, Zhou, Xue, Yan, Xin, Zhao, Yong, and Cheng, Tonglei

Abstract

The rapid development of wearable electronic devices and the diversification of social needs urgently demand high-performance wearable pressure sensors capable of stable operation in special environments. In this article, a flexible pressure sensor composed of biphasic multidimensional hybrid conductive nanocomposites (CNCs) and surface microstructures was proposed. Changes of conductive path happened both at microscopic (CNC-induced) and macroscopic (microneedle-induced) levels, synergistically improving the sensor’s performance. The influence of conductive filler and surface microstructure on the sensitivity and sensing range of the sensor was systematically investigated, revealing the intrinsic connection between material property, geometric structure, and sensing performance, and yielding the optimal fabrication parameters. In addition to high sensitivity over large sensing range, the proposed sensor also provided a fast response time, was unaffected to temperature fluctuations, and exhibited good repeatability and environmental stability. To mimic human fingertip skin, a sandpaper template was used to create external microstructures on the lower electrode of the pressure sensor, enabling the recognition of object roughness and further expanding the sensor’s application range. Additionally, the sensor’s good waterproof property made it suitable for underwater applications. As a proof of concept, the sensor was employed for underwater activity detection and information transmission.

Published
2024
Full Text
View/download PDF

17. Temperature Detection Based on Surface Plasmon Resonance Sensor for Microwave Ablation

Author

Zhang, Qi, Hu, Taotao, Liu, Hailian, Korganbayev, Sanzhar, Saccomandi, Paola, Zhou, Xue, Yan, Xin, Zhang, Xuenan, and Cheng, Tonglei

Abstract

Microwave ablation is a minimally invasive technique using microwave energy to heat and destroy abnormal cells in tumors, in which temperature monitoring is critical to achieve the desired thermal therapy effect while protecting surrounding healthy tissue. This article proposes for the first time using a surface plasmon resonance (SPR)-based temperature sensor for the real-time monitoring of tissue temperature changes during microwave ablation. The SPR sensor has the advantages of simple structure, low cost, large measurement range, and satisfactory sensitivity. The SPR sensor adopted a multimode fiber (MMF)–thin-core fiber (TCF)–MMF structure, yielding a sensitivity of $-1.781 \pm 0.031$ nm/°C in the range of $22~^{\circ }$ C– $94~^{\circ }$ C. Furthermore, a commercially available fiber Bragg grating (FBG) array sensor was used as a reference, confirming the effectiveness of the proposed SPR sensor in the application.

Published
2024
Full Text
View/download PDF

18. A Simple and Low-Cost Fiber-Optic Sensor Based on Photoluminescence for Temperature Independent Ultraviolet Detection

Author

Liu, Wei, Tong, Xin, Yin, Zhiyuan, Zhou, Xue, Zhang, Xuenan, Yan, Xin, Suzuki, Takenobu, Ohishi, Yasutake, and Cheng, Tonglei

Abstract

In this article, we propose and experimentally demonstrate a simple and low-cost fiber-optic sensor for temperature-independent ultraviolet (UV) detection. The sensor utilizes a photosensitive material, i.e., acrylic and hydrogenated epoxy resin, which is tightly wrapped around one end of a multimode optical fiber (MMF) and processed by light curing and heat curing. Upon absorbing UV radiation, the phosphor in the resin compound undergoes population inversion, resulting in the emission band around 480 nm, and the peak intensity of the emission band is positively correlated with the UV excitation intensity. The UV sensing characteristics of the sensor are experimentally investigated by tracking the photoluminescence peak intensity of the output spectrum, demonstrating a fast response of 0.1–0.2 s, high sensitivity of 315.78 (mW/cm2)−1, small absolute error within −0.28 to 0.42 mW/cm2, and good repeatability ( $R > $ 95%) and stability (RSD < 1.3%). In addition, the peak intensity is proved to be insensitive to temperature variation: as temperature varies from −20.5 °C to 56.3 °C, it shows only a small fluctuation, relative standard deviation (RSD) being less than 4.7%, indicating that the photothermal effects have negligible effect on the UV measurement accuracy. With the advantages of simple structure, easy fabrication, low cost, and excellent performance, the proposed sensor is expected to be used for reliable UV detection in practical applications.

Published
2024
Full Text
View/download PDF

26. Preparation and transmission characteristics of seven-core few-mode fiber with low loss and low inter-core crosstalk

Author

Shao, Pengshuai, primary, Wang, Luyao, additional, Wang, Yan, additional, Li, Shuguang, additional, Li, Zenghui, additional, Wang, Xiaokai, additional, Ma, Liling, additional, Meng, Xiaojian, additional, Guo, Ying, additional, Li, Jianshe, additional, Cheng, Tonglei, additional, Liang, Yongze, additional, Xu, Weiwei, additional, Qin, Yu, additional, and Zhou, Hui, additional

Published
2022
Full Text
View/download PDF

43. Study of Two-Step Parallel Cutting Technology for Deep-Hole Blasting in Shaft Excavation

Author

Zuo Jinjing, Changda Zheng, Renshu Yang, Qing Li, Liyun Yang, Chenxi Ding, and Cheng Tonglei

Subjects
Article Subject, Physics, QC1-999, Mechanical Engineering, Two step, 0211 other engineering and technologies, Excavation, 02 engineering and technology, Deep hole, Geotechnical Engineering and Engineering Geology, Condensed Matter Physics, Clamping, Mining engineering, Mechanics of Materials, Geology, 021101 geological & geomatics engineering, 021102 mining & metallurgy, Civil and Structural Engineering, Rock blasting
Abstract

In hard rock deep-hole blasting excavation, blastholes are rarely utilized due to the clamping effect of the lower rock, which affects excavation progress and restricts the development and application of deep-hole blasting technology. Cut blasting is a key to improving excavation speed. In this paper, a new cutting method designating the two-step cutting technology was presented. The blasthole was divided into upper and lower sections without changing the blasthole layout. The upper section was detonated first, creating sufficient free surface for the lower section, which was detonated secondly. This created a larger cavity and improved blasthole utilization. Results showed good blasting effects for two-step cutting technology through theoretical analysis and engineering applications. The blasthole utilization rate was 96.1% when the upper and lower specific charge ratio = 0.78. This paper provides a good reference for resolving the low blasthole utilization problem in deep-hole blasting of vertical shafts within a hard rock.

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results