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158 results on '"Zhuang, Y.-H."'

5. Fabrication and application of co-continuous Al2O3/Al composite by reactive infiltration of molten Al into the preform of SiO2with cordierite addition

Author

Li, J. Q., Xie, S. H., Zhuang, Y. H., and Zeng, X. R.

Abstract

Interpenetration Al2O3/Al(Si) composites were fabricated by reactive infiltration of molten Al into the preforms with SiO2–4.6 mol.% cordierite at 1150 °C in air. The formation kinetics and microstructures of the composites were investigated. Experimental results show that the addition of cordierite in SiO2is favorable for wetting of molten Al on the preform, leading to high growth rate of the composite (8.76 mm min –1). The growth rate of the composite was controlled by the infiltration of molten Al into the preform through the open pores and cracks formed during the preform fabrication or through microcracks created during the infiltration process. Since the addition of cordierite in SiO2can lower the preform sintering temperature, one of its applications is used for ceramic – ceramic or ceramic – metal joints. A strong Al2O3–Al2O3joint with a shear strength of 109 MPa was fabricated and investigated using the Al2O3/Al(Si) interlayer formed by this method.

Published
2022
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8. The giant magnetocaloric effect of Gd5Si1.95Ge2.05 enhanced by Sn doping.

Author

Li, J. Q., Sun, W. A., Jian, Y. X., Zhuang, Y. H., Huang, W. D., and Liang, J. K.

Subjects
MAGNETIC alloys, GERMANIUM alloys, GADOLINIUM, CURIE temperature, MAGNETIC fields
Abstract

The effects of tin substitution on the phase formation, the Curie temperature, and the magnetic entropy change of the monoclinic Gd5Si1.95Ge2.05 alloy have been investigated. Five Sn-doped Gd5Si1.95-xGe2.05-xSn2x samples were prepared with 2x=0, 0.01, 0.03, 0.05, and 0.10, respectively. Experimental results show that a small amount of Sn doping in Gd5Si1.95Ge2.05 retains the first order structural/magnetic transition, significantly enhances its magnetocaloric effects as well as increase its Curie temperature Tc, but leads to increase in hysteresis loss due to its field-induced monoclinic to orthorhombic phase transformation. The maximum magnetic entropy change of the Sn-doped Gd5Si1.935Ge2.035Sn0.03 sample for the 0–2.0 T magnetic field change reaches 28.9 J kg-1 K-1 at 277 K, which is twice as large as that of pure Gd5Si1.95Ge2.05 (14.1 J kg-1 K-1 at 260 K) for the same magnetic field change. [ABSTRACT FROM AUTHOR]

Published
2006
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9. Screening for syphilis with dual algorithms: analysis of discordant and concordant serology results in a population with a low prevalence of syphilis.

Author

Gong, Y., Xu, X.‐F., Gao, X., Lu, R.‐Q., Guo, L., Zhuang, Y.‐H., Liu, H., Tang, J., Wang, Y.‐Z., Zheng, X.‐H., and Ju, S.‐G.

Abstract

Background: Currently, many laboratories have switched the traditional screening algorithm (TSA) to reverse screening algorithm (RSA) for the efficiencies in high‐volume syphilis screening. However, confusions have been arisen regarding this paradigm shift. Objective: To compare the performance of two algorithms with head‐to‐head mode. Methods: Sera screening for syphilis were tested in parallel with chemiluminescence immunoassay (CIA) and toluidine red unheated serum test (TRUST). CIA‐reactive sera from the RSA were reflexively tested with TRUST and confirmed with Treponema pallidum particle agglutination assay (TPPA), while the TRUST‐reactive serology from the TSA were afterwards tested with TPPA. Results: A total of 110 663 serum samples were screened. The RSA identified 2259 (2.0%) CIA‐reactive results, of which 377 (16.7%) showed TPPA nonreactive results, while the TSA identified 934 (0.8%) TRUST‐reactive results, of which 67 (7.2%) showed TPPA‐nonreactive results. Among the 2259 CIA‐reactive results, 1392 (61.6%) were TRUST‐nonreactive, of which 350 (25.1%) were TPPA‐nonreactive. A total of 182 sera from the 350 TPPA‐nonreactive sera were further tested by a second CIA (VITROS Syphilis TPA, VITROS TPA), of which 155 (85.2%) were nonreactive and 27 (14.8%) were reactive. The 27 VITROS TPA‐reactive sera were further tested with a treponemal Western blot assay (Euroimmun IgG Western Blot, EuroWB), of which 11 (41%) were indeterminate, 6 (22%) were nonreactive and 10 (37%) were reactive. Among the 10 EuroWB‐reactive sera, two seroconverted to TPPA 1:80+/− after 1‐year follow‐up. Of 867 CIA‐reactive/TRUST‐reactive results, 27 (3.1%) were TPPA‐nonreactive. Conclusions: The RSA identified more patients with reactive treponemal serology. However, it also yielded an increased likely false‐reactive rate compared with the TSA, especially those results with low index values and TRUST‐nonreactive serology, were necessary to retest with a second treponemal test. Further testing results with TPPA, VITROS TPA and EuroWB suggested the false‐reactive CIA screening results and the likely false‐nonreactive TPPA results when the reactive treponemal results screened with RSA were to be identified. [ABSTRACT FROM AUTHOR]

Published
2019
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12. Very High Modulation Efficiency of Ultralow Threshold Current Single Quantum Well InGaAs Lasers

Author

Chen, T. R., Zhao, B., Eng, L., Zhuang, Y. H., O'Brien, J., and Yariv, A.

Subjects
Condensed Matter::Materials Science, Condensed Matter::Other, Physics::Optics, Physics::Atomic Physics, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Caltech Library Services
Abstract

A record high current modulation efficiency of 5 GHz/[sqrt](mA) has been demonstrated in an ultralow threshold strained layer single quantum well InGaAs laser.

Published
1993

27. Combined High Power and High Frequency Operation of InGaAsP/InP Lasers at 1.3μm

Author

Chen, T. R., Zhuang, Y. H., Yariv, A., Blauvelt, H., and Bar-Chaim, N.

Subjects
Caltech Library Services
Abstract

A simultaneous operation of a semiconductor laser at high power and high speed was demonstrated in a buried crescent laser on a P-InP substrate. In a cavity length of 300μm, a maximum CW power of 130mW at room temperature was obtained in a junction-up mounting configuration. A 3dB bandwidth in excess of 12GHz at an output power of 52mW was observed.

Published
1990

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