Jia Liu

North University of China

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Pinggang Jia

North University of China

Jijun Xiong

North University of China

Guowen An

North University of China

Ting Liang

North University of China

Qianyu Ren

North University of China

Wenyi Liu

Third Affiliated Hospital of Zhengzhou University

Huixin Zhang

North University of China

Di Zhu

Northwestern Polytechnical University

Yingping Hong

North University of China

Yulong Hou

Xi'an Jiaotong University

Cooperative Institutions

Friedrich-Alexander-Universität Erlangen-Nürnberg

102

Chinese Academy of Sciences

North University of China

University of Chinese Academy of Sciences

Institute of High Energy Physics

Campbell Collaboration

Shanghai Jiao Tong University

Consejo Nacional de Investigaciones Científicas y Técnicas

Universidad Nacional Autónoma de México

Centre National de la Recherche Scientifique

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Dual-wavelength demodulation technique for interrogating a shortest cavity in multi-cavity fiber-optic Fabry–Pérot sensors

Optics Express (2021)

Qianyu Ren Pinggang Jia Guowen An Jia Liu Guocheng Fang

This paper demonstrates, for the first time, a novel demodulation technique that can be applied for interrogating a shortest cavity in multi-cavity Fabry–Pérot (F–P) sensors. In this demodulation technique, using an amplified spontaneous emission (ASE) light source and two optical fiber broadband filters, the interference only occurs in a shortest F–P cavity that is shorter than the half of the coherence length. Using a signal calibration algorithm, two low-coherence interference optical signals with similar coherence lengths were calibrated to obtain two quadrature signals. Then, the change in the cavity length of the shortest F–P cavity was interrogated by the two quadrature signals and the arctangent algorithm. The experimental results show that the demodulation technique successfully extracted 1 kHz and 500 Hz vibration signals with 39.28 µm and 64.84 µm initial cavity lengths, respectively, in a multi-cavity F–P interferometer. The demodulation speed is up to 500 kHz, and the demodulation technique makes it possible for multi-cavity F–P sensors to measure dynamic and static parameters simultaneously. The results show that the demodulation technique has wide application potential in the dynamic measurement of multi-cavity F–P sensors.

10.1364/oe.438258

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Citations (12)

Electrochemical Machining of γ-TiAl Intermetallic Blades by Using the Stainless Steel Anti-copied Tool Electrodes

Procedia CIRP (2018)

Jia Liu Hao Wang Di Zhu

Electrochemical machining (ECM) is an important technology to process γ-TiAl intermetallic components such as aero-engine blades. The anti-copy method is an efficient ECM technology to process workpiece without design cathode tools. By using the transfer effect of two opposite ECM stages, the workpiece can be processed by the standard sample directly. In ordinary anti-copy method, the processing accuracy is guaranteed by controlling the consistency of processing conditions in two ECM stages. The anode material of anti-copy tool and workpiece must be consistent. This limits the generality of anti-copy method. In order to eliminate the anode material restriction, an generic ECM anti-copy method with machining gaps control was presented. The processing dynamic simulation analysis was carried out. The simulation result shows that the optimum machining gap in copy workpiece stage with minimum profile different is near the machining gap in anti-copy tool stage. Through the feeding rate adjustment to control the optimum machining gap, the γ-TiAl blades were processed by using the stainless steel anti-copied tools. The test specimens have good quality and high accuracy. The experimental results proved the feasibility of the proposed method.

Electrochemical Machining

10.1016/j.procir.2017.12.133

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Citations (14)

Corrosion behavior and passivation protection mechanism on different zone of high-nitrogen steel weld

Materials Letters (2021)

Di Bai Fengde Liu Hong Zhang Jia Liu

Passivation

Base metal

Pitting Corrosion

10.1016/j.matlet.2021.130194

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Citations (8)

Electrochemical Machining Multiple Slots of Bipolar Plates with Tool Vibration

International Journal of Electrochemical Science (2018)

Xiaochen Jiang Jia Liu Ningsong Qu

Electrochemical Machining

10.20964/2018.06.62

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Citations (7)

Analysis of the Technical Indexes between Shandong Team and Guangdong Team in the CBA Finals of 2012-2013 Season

Journal of Hebei Institute of Physical Education (2013)

Jia Liu

By using the methods of literature review,video observation,mathematical statistics,this article analyzes four games between Shandong team and Guangdong team in 2012-2013season,and makes comparative study on offensive and defensive capabilities between Shandong team and Guangdong team.The results show that:Shandong team and Guangdong team have significant difference on the age structure.Shandong team and Guangdong team have significant difference on the scoring ability.Shandong team and Guangdong team have significant difference on the 3mark ball and penalty.Shandong team's assist capacity is weak.Shandong team and Guangdong team have significant difference on the turNovrs.Then it puts forward suggestions accordingly.

Offensive

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Technology of microporous multiple tube membrane filter for purifying cooling water in continuous casting process

China Metallurgy (2015)

Jia Liu

In order to achieve energy conservation and emission reduction and reduce water pollution and water consumption per ton steel in iron and steel industry,technology of filter for continuous casting cooling water in converter steelmaking process was studied,and a filter device whose filter element is porous PVC ceramic composite pipe was successfully developed.Sludge which was obtained by the porous PVC ceramic composite pipe filter was detected,and it was found that the porous PVC ceramic composite pipe filter had a good separation function.Water quality was detected before and after filtration,and it was found that turbidity and suspended solids of water significantly reduced after filtration,and water quality has reached the requirements.Through industrial experiments and nearly three years of practical application,the best operating conditions and backwash conditions of the porous PVC ceramic composite pipe filter were obtained.

Filtration (mathematics)

Source

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Geometry and optics calibration of WFCTA prototype telescopes using star light

Chinese Physics C (2011)

Lingling Ma Yunxiang Bai Z. Cao Mingjun Chen Lihong Chen

The Large High Altitude Air Shower Observatory project is proposed to study high energy gamma ray astronomy ( 40 GeV-1 PeV ) and cosmic ray physics ( 20 TeV-1 EeV ). The wide field of view Cherenkov telescope array, as a component of the LHAASO project, will be used to study energy spectrum and compositions of cosmic ray by measuring the total Cherenkov light generated by air showers and shower maximum depth. Two prototype telescopes have been in operation since 2008. The pointing accuracy of each telescope is crucial to the direction reconstruction of the primary particles. On the other hand the primary energy reconstruction relies on the shape of the Cherenkov image on the camera and the unrecorded photons due to the imperfect connections between photomultiplier tubes. UV bright stars are used as point-like objects to calibrate the pointing and to study the optical properties of the camera, the spot size and the fractions of unrecorded photons in the insensitive areas of the camera.

Air shower

Cherenkov Telescope Array

Optical telescope

10.1088/1674-1137/35/5/015

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Citations (5)

Tunable optical frequency up-conversion in millimeter wave band

Asia Communications and Photonics Conference and Exhibition (2010)

Bin Li Jinlong Yu Bo Wu Wenrui Wang Bingchen Han

We propose a novel technique to achieve optical frequency up-conversion in millimeter wave band without any local microwave oscillator. By utilizing injection locking of Febry-Perot Laser diode, a suitable negative dispersion device and polarization interferometer, a 2.5 Gb/s baseband signal is frequency up-conversion to a subcarrier modulation signal at 30.8 GHz.

Extremely high frequency

Injection locking

SIGNAL (programming language)

10.1109/acp.2010.5682570

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Double transformation of the nonlinear absorption in silver nanoparticles

Optics Express (2022)

Jijuan Jiang Shiyi Zuo Guan Wang Jia Liu Xiaoming Zhang

The nonlinear absorption of 40 nm Ag nanoparticles (Ag NPs) was investigated using open aperture (OA) Z-scan technique at 532 nm. Experiments show that the nonlinear absorption behavior of Ag NPs is intensity dependent. Specifically, under low laser energy the Ag NPs shows saturable absorption (SA). At medium laser energy, the transformation of nonlinear absorption from SA to reverse saturable absorption (RSA) happens. While under stronger laser energy, double transformation (SA→RSA→SA) of nonlinear absorption occurs. The experimental results were analyzed theoretically using a model based on single-photon absorption and two-photon absorption saturation.

Saturable absorption

Two-Photon Absorption

Z-scan technique

10.1364/oe.472705

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Citations (3)

Business Model, Lock-in Effect and Network Effect of Virtual Community

IOP Conference Series Materials Science and Engineering (2020)

Shih-Feng Chang Guo-An Wu Jia Liu

Abstract As progress of era and technology and development of internet, many firms make big change which occurring on communication and interaction among people differing from before. Especially in recent years, virtual community which has characteristics of social networking services appears and grows up, and it make the related topics of network effect more and more attraction between academics and industry. In other words, social network which has multiple functions can fully utilize the powers of these new and popular virtual community to prototype and develop rapidly on internet, even more, to make general interest users to expand human network, interact and exchange information through these internet tools. In view of this, we take Facebook, MySpace, YouTube, Flickr, Twitter, Plurk, Wretch and PTT as research subjects, through qualitative analysis, and finally we discover significant relationships among business model, lock-in effect and network effect.

Lock (firearm)

Virtual community

Social network (sociolinguistics)

Virtual world

Online business

10.1088/1757-899x/806/1/012042

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