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Your search keyword '"Li, Y. F."' showing total 36 results
Start Over Author "Li, Y. F." Journal applied physics letters
36 results on '"Li, Y. F."'

1. Strong magnetic fields generated with a simple open-ended coil irradiated by high power laser pulses

Author

Zhu, B. J., primary, Li, Y. T., additional, Yuan, D. W., additional, Li, Y. F., additional, Li, F., additional, Liao, G. Q., additional, Zhao, J. R., additional, Zhong, J. Y., additional, Xue, F. B., additional, He, S. K., additional, Wang, W. W., additional, Lu, F., additional, Zhang, F. Q., additional, Yang, L., additional, Zhou, K. N., additional, Xie, N., additional, Hong, W., additional, Wei, H. G., additional, Zhang, K., additional, Han, B., additional, Pei, X. X., additional, Liu, C., additional, Zhang, Z., additional, Wang, W. M., additional, Zhu, J. Q., additional, Gu, Y. Q., additional, Zhao, Z. Q., additional, Zhang, B. H., additional, Zhao, G., additional, and Zhang, J., additional

Published
2015
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2. In situ observation of structure and electrical property changes of a Ga-doped ZnO/graphene flexible transparent electrode during deformation

Author

Zhang, L. Q., primary, Gao, Z. F., additional, Tu, Z. Q., additional, Liu, C., additional, Qi, Y., additional, Yang, F., additional, Yang, W., additional, Jiang, D. Q., additional, Guo, Y. P., additional, Ye, Z. Z., additional, Lu, J. G., additional, Hou, X. Y., additional, Li, Y. F., additional, and Cui, L. S., additional

Published
2014
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6. Dynamic ripples in single layer graphene

Author

He, Y. Z., primary, Li, H., additional, Si, P. C., additional, Li, Y. F., additional, Yu, H. Q., additional, Zhang, X. Q., additional, Ding, F., additional, Liew, K. M., additional, and Liu, X. F., additional

Published
2011
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18. Effect on nitrogen acceptor as Mg is alloyed into ZnO

Author

Gai, Y. Q., primary, Yao, B., additional, Wei, Z. P., additional, Li, Y. F., additional, Lu, Y. M., additional, Shen, D. Z., additional, Zhang, J. Y., additional, Zhao, D. X., additional, Fan, X. W., additional, Li, Jingbo, additional, and Xia, Jian-Bai, additional

Published
2008
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28. Investigation on intergranular exchange coupling effect in Pr9Fe85.5B5.5 ribbons.

Author

Li, Z. B., Zhang, M., Wang, L. C., Shen, B. G., Zhang, X. F., Li, Y. F., Hu, F. X., and Sun, J. R.

Subjects
MAGNETIC coupling, THERMAL properties, MAGNETIZATION, MAGNETIC relaxation, SOLENOIDS, ELECTROMAGNETISM
Abstract

The intergranular exchange coupling effects are investigated via thermal activation of magnetization reversal in the magnetic relaxation process, combined with Henkel plots and the measurement of susceptibilities in three types of Pr9Fe85.5B5.5 ribbons. Exchange interaction between hard-hard grains is proposed in optimal melt-spun ribbons, as well as in over melt-spun ribbons even bearing a weak exchange coupling between soft-hard grains. In under melt-spun ribbons, the decoupled effect is proposed between hard-hard grains. These investigations may contribute to a clear understanding about the complicated nature of the intergranular exchange coupling in nanocomposite magnets. [ABSTRACT FROM AUTHOR]

Published
2014
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31. Infrared photovoltaic solar cells based on C60 fullerene encapsulated single-walled carbon nanotubes.

Author

Hatakeyama, R., Li, Y. F., Kato, T. Y., and Kaneko, T.

Subjects
*SOLAR cells, *CARBON nanotubes, *ENERGY conversion, *HETEROJUNCTIONS, *FULLERENES, *WAVELENGTHS, *INFRARED spectra
Abstract

We have investigated the possibility of using single-walled carbon nanotubes (SWNTs) as the infrared energy conversion material based on the configuration of SWNT/Si heterojunction. The performance of solar cells based on SWNTs has been examined under illumination by the light with different wavelengths. Our experimental results confirm that SWNTs play a critical role in transforming the infrared light (1550 nm) into the electrical energy. The encapsulation of C60 fullerene inside SWNTs is found to significantly enhance the performance of solar cells through adjusting the Fermi level of SWNTs. [ABSTRACT FROM AUTHOR]

Published
2010
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32. On the use of a chaotic cavity transducer in nonlinear elastic imaging.

Author

Matar, O. Bou, Li, Y. F., and van den Abeele, K.

Subjects
*CHAOS theory, *TRANSDUCERS, *PIEZOELECTRICITY, *INFORMATION filtering, *TIME reversal
Abstract

We discuss the advantages of “chaotic cavity transducer focusing” to enhance the localization of microdamage in conjunction with nonlinear elastic wave spectroscopy methods. Chaotic cavity transducer focusing is defined as the hardware-software combination of a piezoelectric ceramic glued on a cavity of chaotic shape on the one hand with the reciprocal time reversal (or inverse filter) technique on the other hand. Additional optimization through the use of sweeps and inverse filtering techniques are discussed as well. The technique is applied to image a crack in a steel sample. [ABSTRACT FROM AUTHOR]

Published
2009
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33. Study of the free energy of the La1-xCaxMnO3 manganites based on the temperature dependence of the crystal cell volume.

Author

Tang, G. D., Liu, S. P., Zhao, X., Zhang, Y. G., Ji, D. H., Li, Y. F., Qi, W. H., Chen, W., and Hou, D. L.

Subjects
LINEAR free energy relationship, PEROVSKITE, CRYSTALS, THERMAL analysis, CRYSTAL lattices, POLARONS
Abstract

A study of the free energy of the perovskite manganites was performed by fitting experimental results for the temperature dependence of the crystal cell volume using a detailed semiclassical model of the free energy. The fitted results coincide with the experimental results for the samples La1-xCaxMnO3 (x=0.2, 0.25, 0.3, and 0.5). The free energy includes the energy corresponding to thermal vibration of the crystal lattice, the ionic cohesive energy, and additional energies produced by electrical carriers from the double exchange mechanism and the thermal activation of small polarons. [ABSTRACT FROM AUTHOR]

Published
2009
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34. Photoinduced electron transfer in C60 encapsulated single-walled carbon nanotube.

Author

Li, Y. F., Kaneko, T., and Hatakeyama, R.

Subjects
*FIELD-effect transistors, *FULLERENES, *CHARGE exchange, *NANOTUBES, *CARBON, *LIGHTING, *ELECTRONS
Abstract

The transport properties of field-effect transistors based on C60 fullerene peapods have been investigated and our findings indicate that the transport characteristics of single-walled carbon nanotubes (SWNTs) are highly sensitive to the encapsulated fullerenes due to the charge-transfer effect. Under light illumination, the photoinduced electron transfer characteristics are found in C60 peapods, which is different from those observed for empty SWNTs. The response characteristic of peapod devices to light is reflected in a shift of threshold voltage toward negative values, indicating an electron-doping process. After removing light the photoresponse is fully recoverable, indicating complete restoration of transferred electrons. [ABSTRACT FROM AUTHOR]

Published
2008
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35. Realization of p-type conduction in undoped MgxZn1-xO thin films by controlling Mg content.

Author

Li, Y. F., Yao, B., Lu, Y. M., Wei, Z. P., Gai, Y. Q., Zheng, C. J., Zhang, Z. Z., Li, B. H., Shen, D. Z., Fan, X. W., and Tang, Z. K.

Subjects
*MAGNESIUM compounds, *THIN films, *MOLECULAR beam epitaxy, *CONDUCTION electrons, *PHOTOLUMINESCENCE
Abstract

Undoped MgxZn1-xO thin films with Mg content of 0≤x≤0.20 were grown on c-sapphire substrate by plasma-assisted molecular beam epitaxy. The MgxZn1-xO shows n-type conduction in Mg content of x≤0.05, and the carrier concentration decreases slowly from 1018 to 1017 cm-3 with increasing Mg content. However, as x>=0.10, the MgxZn1-xO begins to show p-type conduction, and the carrier concentration goes down sharply to 1015 cm-3 firstly and then increases slowly with increasing Mg content from 1015 to 1016 cm-3. The mechanism of transformation from n to p type and change of the carrier concentrations with Mg content were investigated by photoluminescence and absorption measurements as well as first-principle calculation [ABSTRACT FROM AUTHOR]

Published
2007
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36. Negative differential resistance in tunneling transport through C60 encapsulated double-walled carbon nanotubes.

Author

Li, Y. F., Hatakeyama, R., Kaneko, T., Kato, T., and Okada, T.

Subjects
*QUANTUM tunneling, *COBALT isotopes, *CARBON nanotubes, *RESONANCE, *FIELD-effect transistors
Abstract

The authors report electric transport properties of resonance tunneling field-effect transistors fabricated using C60-filled metallic double-walled carbon nanotubes. The devices exhibit strong resonance tunneling characteristics and the distinct negative differential resistance with high peak-to-valley current ratio about 1300 is observed at room temperature. In particular, at high bias voltages, the tunneling current is completely dominated by the Coulomb oscillation peaks with uniform conductance at room temperature, reflecting a strong single-electron tunneling effect. [ABSTRACT FROM AUTHOR]

Published
2007
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