Search results for: Sen Qian

Items from 1 to 20 out of 40 results

article

Synthesis of Methylenecyclobutenes by [2+2] Cycloaddition of Allene Ethers and Alkyne

Yi‐Sen Qian

European Journal of Organic Chemistry > 27 > 13 > n/a - n/a

Methylenecyclobutenes are useful precursors to provide other organic compounds. We report intermolecular [2+2] cycloaddition of allene ethers and alkynes at 100 °C, which gives methylenecyclobutenes in 50–60 % yields. The reaction does not require any metal catalyst and shows broad substrate scope, high regioselectivity and high stereoselectivity.

article

White‐light emission and red scintillation from Mn²⁺ ions single‐doped aluminum‐silicate glasses

Zhehao Hua, Gao Tang, Qinhua Wei, Laishun Qin, more

International Journal of Applied Glass Science > 14 > 4 > 573 - 584

A series of Mn²⁺ single‐doped 0.2Gd₂O₃‐0.2Al₂O₃‐0.6SiO₂ (GAS: xMn²⁺) glasses with Si₃N₄ as reducing agent were prepared. The presence of [SiO_4‐x] defects and Mn²⁺ ions was determined from the absorption and excitation spectra of the glasses. With the increase of Mn²⁺ concentration, the intensity of blue emission decreases, while the intensity of red emission increases. The color coordinate of GAS:...

article

An extrinsic Fabry–Pérot interference fiber sensor for ultrasonic detection of partial discharge

Ximin Zhang, Sen Qian, Huixin Liu, Chuan Chen, more

Optica Applicata > 2023 > Vol. 53, nr 2 > 199--211

An ultrasonic sensor based on extrinsic Fabry–Pérot interference (EFPI) has been designed and demonstrated to detect the ultrasonic wave signal. The sensitivity and natural frequency of fiber Fabry–Pérot (F-P) sensor with different structure parameter have been simulated by COMSOL. The simulation results illustrate that the sensitivity is up to 1.737 nm/kPa and the natural frequency is 2.1 MHz, when...

article

Enhanced photoluminescence quantum yield of Ce³⁺‐doped aluminum–silicate glasses for scintillation application

Tao Wu, Zhehao Hua, Gao Tang, Huiyun Ban, more

Journal of the American Ceramic Society > 106 > 1 > 476 - 487

Ce³⁺‐doped 20Gd₂O₃–20Al₂O₃–60SiO₂ (GAS:xCe³⁺) glasses (x = 0.3, 0.7, 1.1, 1.5, 1.9 mol%) with Si₃N₄ as a reducing agent were prepared. The density of the glasses is around 4.2 g/cm³. With the increase in the Ce³⁺ concentration, both the photoluminescence (PL) and PL excitation peaks of GAS:xCe³⁺ glasses show a redshift because the 4f–5d energy levels of Ce³⁺ ions are narrowed. PL quantum yield and...

article

A Review on Cable-driven Parallel Robots

Sen Qian, Bin Zi, Wei-Wei Shang, Qing-Song Xu

Chinese Journal of Mechanical Engineering > 2018 > 31 > 1 > 1-11

Cable-driven parallel robots (CDPRs) are categorized as a type of parallel manipulators. In CDPRs, flexible cables are used to take the place of rigid links. The particular property of cables provides CDPRs several advantages, including larger workspaces, higher payload-to-weight ratio and lower manufacturing costs rather than rigid-link robots. In this paper, the history of the development of CDPRs...

article

Luffing angular response field prediction of the DACS with narrowly random payload parameters based on a modified hybrid random method

Bin Zhou, Bin Zi, Sen Qian, Weidong Zhu

Archive of Applied Mechanics > 2018 > 88 > 10 > 1767-1789

Deterministic kinematic modeling and stochastic luffing angular response field prediction of the dual automobile cranes system (DACS) are studied in this paper. For the response analysis of the DACS with deterministic information, the inverse kinematics are analyzed. For the prediction of luffing angular response field of the DACS with narrowly random payload parameters, a narrowly random model is...

article

Effects of unbalance on the nonlinear dynamics of rotors with transverse cracks

Shuai Wang, Yanyang Zi, Sen Qian, Bin Zi, more

Nonlinear Dynamics > 2018 > 91 > 4 > 2755-2772

Unbalance is an inevitable issue in rotating machineries due to the manufacturing tolerances, the assembly errors, the damage in rotating components, etc. The effects of unbalance on the nonlinear dynamics of cracked rotors are investigated in this paper. In order to overcome the assumption of weight dominance, 3D finite element models are employed to discretize the rotor and several contact pairs...

article

Dynamics-based nonsingular interval model and luffing angular response field analysis of the DACS with narrowly bounded uncertainty

Bin Zhou, Bin Zi, Sen Qian

Nonlinear Dynamics > 2017 > 90 > 4 > 2599-2626

This paper develops a dynamics-based nonsingular interval model and proposes a first-order composite function interval perturbation method (FCFIPM) for luffing angular response field analysis of the dual automobile cranes system (DACS) with narrowly bounded uncertainty. By using the nonsingular interval model to describe a structure parameter with bounded uncertainty, the reasonable lower and upper...

chapter

Breakdown characteristic of natural ester gelling process under oxidation and its impact on fresh oil

Xin Li, Sen Qian, Xiaogang Xu, Jiajian Huang, more

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL) > 1 - 4

2017 IEEE 19th International Conference on Dielectric Liquids (ICDL)

Natural ester as an environmentally friendly dielectric liquid is becoming commonly used in power transformer. However, it is susceptible to oxidation. Under severe oxidation, the oil sample could gel whose impact on insulation performance is not known. In this research, we focus on the impact of the gelling process of natural ester on its breakdown characteristics. In order to survey this, a breakdown...

article

Electron optics design of an 8-in. spherical MCP-PMT

Ping Chen, Jinshou Tian, Sen Qian, Tianchi Zhao, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2017 > 848 > C > 1-8

This paper discusses the electron optical system of an 8-in. spherical MCP-PMT. The MCP assembly, the supporting pole and the supply voltages are carefully designed to optimize the photoelectron collection efficiency and the transit time spread. Coating the MCP nickel-chromium electrode with an additional high secondary emission material is employed to make a breakthrough on the collection efficiency...

article

Cost-effectiveness analysis of traditional Chinese medicine for the treatment of upper respiratory tract infections

Meng Zheng, Lei Tian, Hui-Ling Huang, Fang-Zhou Wang, more

European Journal of Integrative Medicine > 2017 > 9 > C > 97-102

Traditional Chinese medicine (TCM) has been used to treat upper respiratory tract infections (URTIs) and common cold in Asian countries for over 2000 years. However, only few well designed Chinese studies have assessed TCM for URTI treatment. Therefore, the main purpose of this study was to perform an economic evaluation to assess the cost-effectiveness of Traditional Chinese Medicine by comparing...

chapter

A distributed fiber sensing system for acoustic emission and vibration of power equipment

Sen Qian, Hao Chen, Yang Xu, Lisheng Zhong, more

2016 International Conference on Condition Monitoring and Diagnosis (CMD) > 802 - 805

2016 International Conference on Condition Monitoring and Diagnosis (CMD)

Vibration and acoustic signals are important for the assessment of health of the power equipment. Piezoelectric sensors, often working as accelerometer or acoustic transducer, were often employed in application of vibration and acoustic detection. However, the advancement of fiber optic sensor made them increasingly popular among the monitoring application within power grid recently. Fiber optic sensor...

article

Optimization of the electron collection efficiency of a large area MCP-PMT for the JUNO experiment

Lin Chen, Jinshou Tian, Chunliang Liu, Yifang Wang, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2016 > 827 > C > 124-130

A novel large-area (20-inch) photomultiplier tube based on microchannel plate (MCP-PMTs) is proposed for the Jiangmen Underground Neutrino Observatory (JUNO) experiment. Its photoelectron collection efficiency C_e is limited by the MCP open area fraction (A_open). This efficiency is studied as a function of the angular (θ), energy (E) distributions of electrons in the input charge cloud and the potential...

chapter

Medical image segmentation based on FCM and Level Set algorithm

Sen Qian, Guirong Weng

2016 7th IEEE International Conference on Software Engineering and Service Science (ICSESS) > 225 - 228

2016 7th IEEE International Conference on Software Engineering and Service Science (ICSESS)

An approach for medical image segmentation based on Fuzzy C-Means (FCM) and Level Set algorithm is proposed in this paper. FCM algorithm is suitable for solving the problems of fuzzy and uncertainty in gray level images. Level Set algorithm can effectively solve the change of the topology of the curve evolution, and realize multiple-objects extraction. In this paper, first the noise is eliminated...

article

The R&D of the 20in. MCP–PMTs for JUNO

Yaping Chang, Guorui Huang, Yuekun Heng, Dong Li, more

Nuclear Instruments and Methods in Physics Research Section A: Accelerators,... > 2016 > 824 > C > 143-144

A new concept of large area photomultiplier based on MCPs was conceived for JUNO by the scientists in IHEP, and with the collaborative work of the MCP–PMT collaboration in China, 8in. and 20in. prototypes were produced. Test results show that this type of MCP–PMT can have good SPE performance as the traditional dynode type PMTs.

chapter

Collision free force closure workspace determination of reconfigurable planar cable driven parallel robot

Bingyao Wang, Bin Zi, Sen Qian, Dan Zhang

2016 Asia-Pacific Conference on Intelligent Robot Systems (ACIRS) > 26 - 30

2016 Asia-Pacific Conference on Intelligent Robot Systems (ACIRS)

This paper considers the problem of Collision Free Force Closure Workspace (CFFCW) determination for Reconfigurable Planar Cable-Driven Parallel Robots (RPCDPRs). The cluttered obstacles in environment and the radiate cable structure make this problem highly nontrivial. Firstly, the simplified model of general RPCDPR that with cluttered environment is proposed. Then, the critical support lines of...

article

Quantitative assessment on the variation of compressibility of Wenzhou marine clay during destructuration

Xia Bian, Jian-Wen Ding, Jian Shi, Sen Qian

KSCE Journal of Civil Engineering > 2017 > 21 > 3 > 659-669

A series of oedometer test were performed on both undisturbed and remolded specimens of Wenzhou marine clay to quantitatively investigate the degradation of soil structure during compression. The laboratory tests show that the swell index of both natural and remolded Wenzhou marine clay increase with the increase in consolidation stress. Hence, the normalizing parameter ‘swell sensitivity’, termed...

chapter

Acoustic fiber optic sensors for partial discharge monitoring

Sen Qian, Hao Chen, Yang Xu, Lisheng Zhong, more

2016 IEEE Electrical Insulation Conference (EIC) > 109 - 112

2016 IEEE Electrical Insulation Conference (EIC)

Partial discharge acoustic monitoring is an important tool in assessing the health of power equipment. Traditionally, the acoustic sensor is made of piezoelectric transducer (PZT), and is packaged in a metal tube. Recently, the advancement in fiber-optic sensor technology provides clear benefits in such applications, particularly because optical fiber is immune to electromagnetic interference. Additionally,...

article

Aging behavior of large area MCP–PMT

Wen-Wen Wang, Sen Qian, Ming Qi, Jing-Kai Xia, more

Nuclear Science and Techniques > 2016 > 27 > 2 > 1-5

The Institute of High Energy Physics, Chinese Academy of Sciences have designed a new type of photomultiplier tube (PMT) based on microchannel plates (MCPs) with large area photocathode, known as large area microchannel plate photomultiplier tube (MCP–PMT). The aging characteristics of the large area MCP–PMTs are different from dynode PMTs and small proximity-focus MCP–PMT. In this work, a prototype...

article

A RPC test station based on ROOT and VME

Zhi-Peng Lü, Qing-Min Zhang, Jie Zhao, Jia-Wen Zhang, more

Nuclear Science and Techniques > 2016 > 27 > 2 > 1-7

Due to its advantages in large-area application situations, the R&D of the resistive plate chamber (RPC) has always been carried out. A performance test station for RPC R&D has been designed and developed based on the VME bus and ROOT in Linux. This system can be customized expediently according to the requirements of different tests, which facilitates detector R&D because of its automatic...

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INFONA - science communication portal

Search results for: Sen Qian

Synthesis of Methylenecyclobutenes by [2+2] Cycloaddition of Allene Ethers and Alkyne

White‐light emission and red scintillation from Mn²⁺ ions single‐doped aluminum‐silicate glasses

An extrinsic Fabry–Pérot interference fiber sensor for ultrasonic detection of partial discharge

Enhanced photoluminescence quantum yield of Ce³⁺‐doped aluminum–silicate glasses for scintillation application

A Review on Cable-driven Parallel Robots

Luffing angular response field prediction of the DACS with narrowly random payload parameters based on a modified hybrid random method

Effects of unbalance on the nonlinear dynamics of rotors with transverse cracks

Dynamics-based nonsingular interval model and luffing angular response field analysis of the DACS with narrowly bounded uncertainty

Breakdown characteristic of natural ester gelling process under oxidation and its impact on fresh oil

Electron optics design of an 8-in. spherical MCP-PMT

Cost-effectiveness analysis of traditional Chinese medicine for the treatment of upper respiratory tract infections

A distributed fiber sensing system for acoustic emission and vibration of power equipment

Optimization of the electron collection efficiency of a large area MCP-PMT for the JUNO experiment

Medical image segmentation based on FCM and Level Set algorithm

The R&D of the 20in. MCP–PMTs for JUNO

Collision free force closure workspace determination of reconfigurable planar cable driven parallel robot

Quantitative assessment on the variation of compressibility of Wenzhou marine clay during destructuration

Acoustic fiber optic sensors for partial discharge monitoring

Aging behavior of large area MCP–PMT

A RPC test station based on ROOT and VME

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