Search Results - (Author, Cooperation:Z. Zeng)
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1X.L. Chen, Y. Wang, G. Chen, D. Han, X. Wang, M. Zeng, Z. Zeng, Z. Zhao and B. Guo
Institute of Physics Publishing (IOP)
Published 2018Staff ViewPublication Date: 2018-02-03Publisher: Institute of Physics Publishing (IOP)Electronic ISSN: 1748-0221Topics: PhysicsPublished by: -
2X.L. Chen, D. Han, M. Gouzevitch, G. Chen, Y. Wang, B. Guo, Q. Zhang, Y. Yu, F. Wang, P. Lyu, Y. Li, M. Zeng, Z. Zeng, Z. Zhao, X. Wang and Y. Li
Institute of Physics Publishing (IOP)
Published 2018Staff ViewPublication Date: 2018-12-04Publisher: Institute of Physics Publishing (IOP)Electronic ISSN: 1748-0221Topics: PhysicsPublished by: -
3Staff View
Publication Date: 2018-06-02Publisher: Institute of Physics (IOP)Print ISSN: 1674-1137Topics: PhysicsPublished by: -
4Staff View
Publication Date: 2018-07-27Publisher: Institute of Physics (IOP)Print ISSN: 1674-1137Topics: PhysicsPublished by: -
5J. Mansir, P. Conti, Z. Zeng, J. J. Pla, P. Bertet, M. W. Swift, C. G. Van de Walle, M. L. W. Thewalt, B. Sklenard, Y. M. Niquet, and J. J. L. Morton
American Physical Society (APS)
Published 2018Staff ViewPublication Date: 2018-04-21Publisher: American Physical Society (APS)Print ISSN: 0031-9007Electronic ISSN: 1079-7114Topics: PhysicsKeywords: Condensed Matter: Electronic Properties, etc.Published by: -
6Chen, S., Weitemier, A. Z., Zeng, X., He, L., Wang, X., Tao, Y., Huang, A. J. Y., Hashimotodani, Y., Kano, M., Iwasaki, H., Parajuli, L. K., Okabe, S., Teh, D. B. L., All, A. H., Tsutsui-Kimura, I., Tanaka, K. F., Liu, X., McHugh, T. J.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-02-10Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyGeosciencesComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Materials Science, NeurosciencePublished by: -
7G. Zeng ; M. Chen ; Z. Zeng
American Association for the Advancement of Science (AAAS)
Published 2013Staff ViewPublication Date: 2013-06-22Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Bees/*drug effects ; Pesticides/*toxicity ; Pollination/*drug effectsPublished by: -
8Cao, Z., Zeng, S., Xu, Z., Arvanitis, A., Yang, S., Gu, X., Dong, J.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-11-24Publisher: American Association for the Advancement of Science (AAAS)Electronic ISSN: 2375-2548Topics: Natural Sciences in GeneralPublished by: -
9Y. H. Fu ; H. Zhao ; S. Piao ; M. Peaucelle ; S. Peng ; G. Zhou ; P. Ciais ; M. Huang ; A. Menzel ; J. Penuelas ; Y. Song ; Y. Vitasse ; Z. Zeng ; I. A. Janssens
Nature Publishing Group (NPG)
Published 2015Staff ViewPublication Date: 2015-09-30Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Cold Temperature ; Europe ; *Global Warming ; Models, Biological ; Photoperiod ; Plant Leaves/*growth & development ; *Seasons ; Time Factors ; Trees/*growth & developmentPublished by: -
10B. Li ; T. Gasser ; P. Ciais ; S. Piao ; S. Tao ; Y. Balkanski ; D. Hauglustaine ; J. P. Boisier ; Z. Chen ; M. Huang ; L. Z. Li ; Y. Li ; H. Liu ; J. Liu ; S. Peng ; Z. Shen ; Z. Sun ; R. Wang ; T. Wang ; G. Yin ; Y. Yin ; H. Zeng ; Z. Zeng ; F. Zhou
Nature Publishing Group (NPG)
Published 2016Staff ViewPublication Date: 2016-03-18Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Aerosols/analysis/chemistry ; Air Pollution/*analysis ; Atmosphere/*chemistry ; Carbon Dioxide/analysis ; China ; Fossil Fuels ; *Greenhouse Effect ; Methane/analysis ; Soot/analysis ; Sulfates/analysis ; Sulfur Dioxide/analysis ; UncertaintyPublished by: -
11Staff View
Publication Date: 2013-07-13Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Groundwater/*chemistry ; Methane/*analysis ; Natural Gas/*supply & distribution ; Water Pollutants/*analysisPublished by: -
12Shen, H. Y. ; Lin, W. X. ; Zeng, R. R. ; Zhou, Y. P. ; Yu, G. F. ; Huang, C. H. ; Zeng, Z. D. ; Zhang, W. J.
[S.l.] : American Institute of Physics (AIP)
Published 1992Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: A new method to get 413.7-nm violet coherent radiation by using second-harmonic generation and sum-frequency mixing of radiation from a 1341.4- and 1079.5-nm dual-wavelength Nd:YALO3 laser in a LiIO3 crystal is reported in this communication. First, the 670.7-nm red coherent radiation is obtained by second-harmonic generation of 1341.4-nm radiations in a LiIO3 crystal, and then the 670.7- and 1079.5-nm radiations are mixed again in a second LiIO3 crystal to get 413.7-nm radiation. The phase-matching angles are obtained for both nonlinear optical processes. The experimental results agree well with calculated results.Type of Medium: Electronic ResourceURL: -
13Shen, H. Y. ; Zhou, Y. P. ; Zeng, R. R. ; Yu, G. F. ; Huang, C. H. ; Zeng, Z. D. ; Zhang, W. J. ; Lin, W. X. ; Ye, Q. J.
[S.l.] : American Institute of Physics (AIP)
Published 1991Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: From our measured value of the stimulated emission cross section for 4F3/2–4I13/2 transition of Nd3+ ion in YAlO3 crystal as well as the results of continuous wave (cw) and pulsed 1341.4 nm Nd:YAP lasers, it can be seen that Nd:YAP is an excellent 1300 nm laser crystal. In our laboratory cw output power of 195.8 W at 1341.4 nm with an overall efficiency of 1.43% and pulsed output energy of 5.1 J at 1341.4 nm with an overall efficiency of 2.02% have been achieved by using this kind of crystal.Type of Medium: Electronic ResourceURL: -
14Shen, H. Y. ; Lin, W. X. ; Zeng, R. R. ; Zhou, Y. P. ; Yu, G. F. ; Huang, C. H. ; Zeng, Z. D. ; Zhang, W. J.
[S.l.] : American Institute of Physics (AIP)
Published 1991Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: A new method to obtain 413.7-nm violet coherent radiation by second-order sum-frequency mixing of the outputs (1341.4 and 1079.5 nm) of a double-wavelength Nd:YALO3 (Nd:YAP) laser in two LiIO3 crystals is reported. First, a 598.1-nm orange coherent radiation is obtained by sum-frequency mixing (SFM) of 1341.4- and 1079.5-nm radiations in a LiIO3 crystal, and then the 598.1- and 1341.4-nm radiations are mixed again in a second LiIO3 crystal to get 413.7-nm radiation. The phase-matching angles are obtained for both SFM processes. The experimental results agree well with calculated results.Type of Medium: Electronic ResourceURL: -
15Staff View
ISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: We studied theoretically ballistic electronic transport in a proposed mesoscopic structure—quantum cable. Our results demonstrated that quantum cable is a unique structure for the study of mesoscopic transport. With the increasing Fermi energy of electrons, the ballistic conductance of quantum cable increases in a series of steps with different height. Besides the steps of one and two quantum conductance units (2e2/h), conductance steps of three and four quantum conductance units can be also expected due to the accidental degeneracies (crossings) of the transverse subbands of quantum cable. As one of the cable structure parameters is varied, the width of conductance plateaus varies in the nonmonotonous way, which arises from the nonmonotonic variation of the separation between the adjoining transverse subbands. In the weak coupling limit, the first two conductance plateaus are both of just one quantum conductance unit 2e2/h for the quantum cable structure of two cylindrical wires with similar thicknesses. © 2000 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
16Zhang, T. ; Tang, B. Y. ; Chen, Q. C. ; Zeng, Z. M. ; Chu, P. K.
[S.l.] : American Institute of Physics (AIP)
Published 1999Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: Metal plasma formed by a vacuum arc plasma source can be passed through a toroidal-section magnetic duct for the filtering of macroparticles from the plasma stream. In order to maximize the plasma transport efficiency of the filter the duct wall should be biased, typically to a positive voltage of about 10–20 V. In some cases it is not convenient to bias the duct, for example if the duct wall is part of the grounded vacuum system. However, a positively biased electrode inserted into the duct along its outer major circumference can serve a similar purpose. In this article, we describe our results confirming and quantifying this effect. We also show the parametric dependence of the duct transport on the experimental variables. © 1999 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
17Zhang, T. ; Tang, B. Y. ; Zeng, Z. M. ; Kwok, T. K. ; Chu, P. K.
[S.l.] : American Institute of Physics (AIP)
Published 1999Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: High energy implantation of metal ions can be carried out using conventional ion implantation with a mass-selected ion beam in scanned-spot mode by employing a broad-beam approach such as with a vacuum arc ion source, or by utilizing plasma immersion ion implantation with a metal plasma. For many high dose applications, the use of plasma immersion techniques offers a high-rate process, but the formation of a surface film along with the subsurface implanted layer is sometimes a severe or even fatal detriment. We describe here an operating mode of the metal plasma immersion approach by which pure implantation can be obtained. We have demonstrated the technique by carrying out Ti and Ta implantations at energies of about 80 and 120 keV for Ti and Ta, respectively, and doses on the order of 1×1017 ions/cm2. Our experiments show that virtually pure implantation without simultaneous surface deposition can be accomplished. Using proper synchronization of the metal arc and sample voltage pulse, the applied dose that deposits as a film versus the part that is energetically implanted (the deposition-to-implantation ratio) can be precisely controlled.© 1999 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
18Shen, H. Y. ; Zeng, R. R. ; Zhou, Y. P. ; Yu, G. F. ; Huang, C. H. ; Zeng, Z. D. ; Zhang, W. J. ; Ye, Q. J.
Woodbury, NY : American Institute of Physics (AIP)
Published 1990Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: The possibility of simultaneous multiple wavelength lasing in various neodymium host crystals such as Nd:YAG, Nd:YLF, Nd:BEL, and Nd:YAP has been analyzed by the "oscillation condition.'' It is shown that this kind of laser can be realized in all the described crystals in pulsed state, but only achieved in the Nd:YAP crystal in continuous-wave state. On the basis of the analyzed results, we have achieved cw simultaneous multiple wavelength lasing in Nd:YAP crystal for the first time at both 1.0795 and 1.3414 μm.Type of Medium: Electronic ResourceURL: -
19Zeng, Z. M. ; Kwok, T. K. ; Tian, X. B. ; Tang, B. Y. ; Chu, P. K.
[S.l.] : American Institute of Physics (AIP)
Published 1999Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Plasma immersion ion implantation (PIII) is an effective technique for the surface modification of industrial components possessing an irregular shape. We have recently used PIII to treat a real industrial ball bearing to enhance the surface properties of the race surface on which the balls roll. The implantation dose uniformity along the groove is assessed using theoretical simulation and experiments. The two sets of results agree very well, showing larger doses near the center. However, the highest dose is not observed at the bottom or center of the groove, but rather offset toward the side close to the sample platen when the bearing is placed horizontally. The minimum dose is observed near the edge or corner of the groove and our model indicates that it is due to the more glancing ion incidence as a result of the evolution of the ion sheath near the corner. The dose nonuniformity along the groove surface is about 40% based on our experimental data. © 1999 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
20Staff View
ISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: We propose that quantum cables can be used as a kind of transport spectroscope to obtain directly the quasi-one-dimensional (Q1D) density of states (DOS) of cylindrical quantum wires. By simultaneously measuring the direct current through the cylindrical quantum wire and the leaky tunneling current into its neighboring wire at desirable temperatures, one can obtain detailed information about the Q1D DOS and subband structure of the cylindrical quantum wire. © 2000 American Institute of Physics.Type of Medium: Electronic ResourceURL: