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  • AIP Publishing  (42)
  • 1
    Online Resource
    Online Resource
    Comparison of valence band x-ray photoelectron spectrum between Al–N-codoped and N-doped ZnO films
    AIP Publishing ; 2006
    In:  Applied Physics Letters Vol. 88, No. 6 ( 2006-02-06)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 88, No. 6 ( 2006-02-06)
    Abstract: The valence band structures of Al–N-codoped [ZnO:(Al, N)] and N-doped (ZnO:N) ZnO films were studied by normal and soft x-ray photoelectron spectroscopy. The valence-band maximum of ZnO:(Al, N) shifts up to Fermi energy level by about 300 meV compared with that of ZnO:N. Such a shift can be attributed to the existence of a kind of Al–N in ZnO:(Al, N), as supported by core level XPS spectra and comparison of modified Auger parameters. Al–N increased the relative quantity of Zn–N i n ZnO:(Al, N), while N–N decreased that of Zn–N in ZnO:N.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2171804
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Chromatic-free spatially resolved optical emission spectroscopy diagnostics for microplasma
    AIP Publishing ; 2009
    In:  Review of Scientific Instruments Vol. 80, No. 2 ( 2009-02-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 80, No. 2 ( 2009-02-01)
    Abstract: A chromatic-free spatially resolved diagnostic system for microplasma measurement is proposed and demonstrated, which consists of an optical chromatic-free microscope mirror system, an electron multiplying charge coupled device (EMCCD), and bandpass filters. The diagnostic system free of chromatic aberrations with a spatial resolution of about 6 μm is achieved. The factors that limit the resolution of this diagnostic system have been analyzed, which are optical diffraction, the pixel size of the EMCCD, and the thickness of the microplasma. In this paper, the optimal condition for achieving a maximum resolution power has been analyzed. With this diagnostic system, we revealed the spatial nonuniformity of a microwave atmospheric-pressure argon microplasma. Furthermore, the spatial distribution of the time-averaged effective electron temperature has been estimated from the intensity distributions of 750.4 and 415.8 nm emissions.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.3079379
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 3
    Online Resource
    Online Resource
    Giant fifth-order nonlinearity via tunneling induced quantum interference in triple quantum dots
    AIP Publishing ; 2015
    In:  AIP Advances Vol. 5, No. 2 ( 2015-02-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 5, No. 2 ( 2015-02-01)
    Abstract: Schemes for giant fifth-order nonlinearity via tunneling in both linear and triangular triple quantum dots are proposed. In both configurations, the real part of the fifth-order nonlinearity can be greatly enhanced, and simultaneously the absorption is suppressed. The analytical expression and the dressed states of the system show that the two tunnelings between the neighboring quantum dots can induce quantum interference, resulting in the giant higher-order nonlinearity. The scheme proposed here may have important applications in quantum information processing at low light level.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.4908008
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 2583909-3
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  • 4
    Online Resource
    Online Resource
    A novel linear piezoelectric actuator with two working principles of standing and traveling wave vibration mode
    AIP Publishing ; 2015
    In:  AIP Advances Vol. 5, No. 10 ( 2015-10-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 5, No. 10 ( 2015-10-01)
    Abstract: This paper presents a new linear piezoelectric actuator, which consists of two pieces of piezoelectric ceramics, a copper substrate and a zirconia driving tip. By changing the input signal, the actuator can be chosen to work in a standing wave mode (two-phase vibration modes coupling) or in a traveling wave mode (four-phase vibration modes coupling). By using the Finite Element Method (FEM), the actuator was designed and optimized, and a prototype was fabricated. For a single actuator at 240Vp-p, the maximum no-load velocity and thrust force were approximately 106 mm/s, 1.2 N in the standing wave mode and 161 mm/s, 1.46 N in the traveling wave mode, respectively. While parallel use of four actuators at the same voltage, the experimental results showed that the velocity and force reached 246 mm/s, 2.2 N in the standing wave mode and 292 mm/s, 4.1 N in the traveling wave mode. More importantly, this study shows that both the load performance and the vibration characteristics of the actuators can be improved greatly by working in the traveling wave mode or parallel distribution of multi-identical piezoelectric actuators.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.4933435
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 2583909-3
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  • 5
    Online Resource
    Online Resource
    A novel microwave combined ultraviolet radiator based on slotted coaxial line for epoxy resin curing
    AIP Publishing ; 2018
    In:  AIP Advances Vol. 8, No. 11 ( 2018-11-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 8, No. 11 ( 2018-11-01)
    Abstract: Curing resin matrix composite quickly constitutes one of the key technologies for industrial lightweight production, especially in automobile manufacturing and aircraft maintenance. In this study, a novel gap coaxial line microwave combined ultraviolet radiator is proposed for epoxy resin curing. With the same power of 100 W, epoxy resin is cured both by the proposed radiator working at a microwave frequency of 2.45 GHz and single ultraviolet. Respectively, the ultraviolet radiation and microwave combined ultraviolet radiation are measured. The microwave radiation and plasma absorption of this radiator is close to 3:4 by simulation and experiment. In addition, experimental results indicate that the processing time using this radiator is 3.6 times shorter than using single ultraviolet. The toughness and adhesiveness of the epoxy resin after curing are compared by scanning electron microscope and X-ray diffusion, and the fracture surface of the cured epoxy resin demonstrates that microwave combined ultraviolet curing is more effective.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5048530
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2583909-3
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  • 6
    Online Resource
    Online Resource
    Tunable magnetocrystalline anisotropy and high-frequency magnetic properties of Y2(Co1−xFex)17 and their composites
    AIP Publishing ; 2023
    In:  AIP Advances Vol. 13, No. 2 ( 2023-02-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 13, No. 2 ( 2023-02-01)
    Abstract: Rare-earth transition-metal (R-T) intermetallic compounds are emerging as competitive candidates for novel microwave absorption materials (MAMs) since they show high magnetization and tunable easy magnetization directions (EMDs). In this work, Y2(Co1−xFex)17 (0 ≤ x ≤ 0.3) compounds with the Th2Ni17 hexagonal structure were prepared with the purpose of tuning the EMDs. As x increases, the EMDs of the Y2(Co1−xFex)17 compounds change from the ab-plane (0 ≤ x & lt; 0.0329) to the cone (0.0329 ≤ x ≤ 0.038) and then to the c-axis direction (0.038 & lt; x ≤ 0.3). Furthermore, it was found that the extremely high cutoff frequencies of the uniaxial anisotropy materials give them considerably potential for microwave absorption applications above 10 GHz, despite their relatively low initial permeability compared to the planar anisotropic materials. By studying the high-frequency properties of Y2(Co1−xFex)17/paraffin composites, it is noted that uniaxial anisotropy compounds with x = 0.1 and x = 0.3 can possess higher permeability above 10 GHz as compared to both planar anisotropy and conical anisotropy compounds (x & lt; 0.1) due to their high cutoff frequencies arising from large magnetocrystalline anisotropy fields. This can improve the impedance matching and thus lead to a better microwave absorption performance in the range of 10 to 40 GHz for materials with uniaxial anisotropy. Among all the compositions, the Y2(Co0.9Fe0.1)17/paraffin composite exhibits a minimum reflection loss (RL) of −50 dB at 6 GHz with a thickness of 2.5 mm and a wide qualified bandwidth (QB, RL & lt; −10 dB) of 9.6 GHz at a center frequency of 30.3 GHz with a thickness of 0.6 mm, thus making it a promising candidate for MAMs above 10 GHz.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/9.0000571
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2583909-3
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  • 7
    Online Resource
    Online Resource
    Design and test of a piezoelectric micropump based on hydraulic amplification
    AIP Publishing ; 2021
    In:  AIP Advances Vol. 11, No. 6 ( 2021-06-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 11, No. 6 ( 2021-06-01)
    Abstract: To solve the problem of the small deformation of piezoelectric vibrators and improve the overall performance of piezoelectric micro-pumps, a flexible-diaphragm piezoelectric micropump is designed based on hydraulic amplification. The micropump uses a piezoelectric vibrator to provide its driving force, and fluid is delivered by driving the liquid to amplify the displacement of the piezoelectric vibrator. First, the working principle of the piezoelectric micropump is analyzed, and then theoretical analysis and displacement output tests of the hydraulic amplifier unit are carried out. The test results are consistent with those of the theoretical analysis, and the amplification factor of the hydraulic amplifier unit is 3.29. Finally, prototypes are produced and an experimental platform is built for testing. The results indicate that the best-performing piezoelectric micropump has a self-priming height of 1200 mm, an output pressure of 22.16 kPa, and an output flow of 23.18 ml/min. Compared with an ordinary piezoelectric pump, the overall performance of the piezoelectric micropump is greatly improved.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0053943
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
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  • 8
    Online Resource
    Online Resource
    Intersubband optical absorption in quantum dots-in-a-well heterostructures
    AIP Publishing ; 2005
    In:  Journal of Applied Physics Vol. 98, No. 5 ( 2005-09-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 98, No. 5 ( 2005-09-01)
    Abstract: The theoretical analysis of intersubband optical transitions for InAs∕InGaAs quantum dots-in-a-well (DWELL) detectors are performed in the framework of effective-mass envelope-function theory. In contrast to InAs∕GaAs quantum dot (QD) structures, the calculated band structure of DWELL quantitatively confirms that an additional InGaAs quantum well effectively lowers the ground state of InAs QDs relative to the conduction-band edge of GaAs and enhances the confinement of electrons. By changing the doping level, the dominant optical transition can occur either between the bound states in the dots or from the ground state in the dots to bound states in the well, which corresponds to the far-infrared and long-wave infrared (LWIR) peaks in the absorption spectra, respectively. Our calculated results also show that it is convenient to tailor the operating wavelength in the LWIR atmospheric window (8–12μm) by adjusting the thickness of the InGaAs layer while keeping the size of the quantum dots fixed. Theoretical predictions agree well with the available experimental data.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2034656
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 9
    Online Resource
    Online Resource
    Early stage of externally driven filling of viscous fluids within a microfluidic pore-doublet network
    AIP Publishing ; 2022
    In:  Physics of Fluids Vol. 34, No. 2 ( 2022-02-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 34, No. 2 ( 2022-02-01)
    Abstract: The early stage of active capillary filling of viscous fluids in a pore-doublet network is studied experimentally. The effects of operating conditions and fluid properties on the filling process are revealed. In the straight channel, the evolution of the meniscus with time transferred from a linear stage to a power-law stage is due to the interplay among the inertial force, capillary force, and viscous force. An expression of the filling rate is proposed at the present startup of the capillary filling flow. With the addition of surfactant sodium dodecyl sulfate (SDS), the power-law stage of the penetration process turns into another linear stage. In symmetrical Y-shaped microchannels, increasing the capillary number or liquid viscosity or adding surfactant SDS to the solutions effectively reduces the difference in liquid position between the branches. A larger Ohnesorge number leads to more uniform and stable penetration.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/5.0077697
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 10
    Online Resource
    Online Resource
    One-step growth of ZnO from film to vertically well-aligned nanorods and the morphology-dependent Raman scattering
    AIP Publishing ; 2005
    In:  Applied Physics Letters Vol. 87, No. 23 ( 2005-12-05)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 87, No. 23 ( 2005-12-05)
    Abstract: We observed a transition from film to vertically well-aligned nanorods for ZnO grown on sapphire (0001) substrates by metalorganic chemical vapor deposition. A growth mechanism was proposed to explain such a transition. Vertically well-aligned homogeneous nanorods with average diameters of ∼30, 45, 60, and 70nm were grown with the c-axis orientation. Raman scattering showed that the E2 (high) mode shifted to high frequency with the decrease of nanorod diameters, which revealed the dependence of nanorod diameters on the stress state. This dependence suggests a stress-driven diameter-controlled mechanism for ZnO nanorod arrays grown on sapphire (0001) substrates.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2137308
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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