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RISS 인기검색어
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- 저자 : Shilong Wei (검색결과 3 건)
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Compact Phase Detector for Optical-Microwave Synchronization Using Polarization Modulation
Wei, Juan,Zhang, Shuangyou,Kim, Jungwon,Pan, Shilong IEEE 2018 Journal of Lightwave Technology Vol.36 No.19
<P>We propose and demonstrate a compact optical-microwave phase detector taking advantage of polarization modulation. The proposed polarization modulator-based phase detector (PolM-PD) shows 460-attosecond residual timing jitter integrated from 1 Hz to 100 kHz when synchronizing an 8-GHz dielectric resonator oscillator to a free-running 250-MHz mode-locked Er-fiber laser. The absolute single-sideband phase noise of the locked 8-GHz DRO is –138 dBc/Hz (–165 dBc/Hz) at an offset frequency of 10 kHz (10 MHz). The proposed PolM-PD has a compact structure implemented by all commercially available components. Because no fiber loop and delay line are used, the proposed PolM-PD can be potentially integrated on a chip.</P>
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Mechanical Properties and Microstructure of Polypropylene Fiber Reinforced Cement Mortar Soil
Bo Ruan,Hui Ding,Jidong Teng,Wei Deng,Shilong Zheng,Chenxi Ruan 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.6
A series of unconfined compressive strength tests and flexural strength tests are carried out to evaluate the improved effect of polypropylene fiber on the defects of cement mortar soil. The following factors, including the fiber content, cement content, sand content and curing age, are studied to investigate the influences on the mechanical properties and microstructure of the samples. The results show that the unconfined compressive strength (UCS), residual strength and flexural strength of the fiber reinforced cement mortar soil (FRCMS) substantially increase with increasing fiber content. The peak strain and ratio of the flexural-compression strength (Rfcs) of the FRCMS first increase and then decrease with an increase in fiber content,and the optimal fiber content is 3.5%. The brittleness index of the FRCMS is found to be inversely proportional to fiber content. The results suggest that the addition of an appropriate amount of fibers can substantially improve the plasticity and lateral stress capacity of the FRCMS. The strength of the FRCMS improves with the increase in cement content, sand content and curing age within a certain range. The microstructure of the FRCMS are analyzedby scanning electron microscopy (SEM) tests.
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Xiaochen Xiong,Xunpeng Qin,Lin Hua,Gang Wan,Shilong Wei,Mao Ni,Zeqi Hu 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.6
An in-situ follow-up hammering-assisted (FH) wire arc additive manufacturing (WAAM) process is proposed for hydraulicturbine blade repairing. With different hammering intervention temperatures above the austenite recrystallization temperature(Tre-γ), the influence and mechanism of the process on the grain size of prior austenite grains and room-temperaturemartensite, as well as the texture of 0Cr13Ni5Mo deposited layers are systematically studied. The OM, SEM and EBSD areused for characterization. The repairing layer of large-sized blade is dominated with the coarse columnar grains with severalmillimeters in length, and the grain size is rated as grade 0. After the FH process, the prior austenite grains are significantlyrefined to grade 8. As the hammering temperature increases, the recrystallized austenite grains gradually grow and coarsenowing to the higher ambient temperature. FH at 950 ℃, a temperature slightly higher than the Tre-γ can achieve the austenitegrains with excellent grain refinement effect. Meanwhile, thanks to microstructure inheritance, the room-temperature martensiticis also refined from 4.69 to 2.47 μm, and the typical < 100 > fibre texture content in the deposited layer is obviouslyreduced with the texture intensity reduced from 6.68 to 2.95. Furthermore, the yield strength is increased by about 200 MPa. The main strengthening mechanisms are grain refinement strengthening and dislocation strengthening, and the contributionsto the yield strength are 96.1 MPa and 79 MPa respectively. Additionally, the FH process is also expected to simultaneouslyimprove the formability of the blade repaired layer.
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