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  • AIP Publishing  (14)
  • Wang, Liping  (14)
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  • AIP Publishing  (14)
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  • 1
    Online Resource
    Online Resource
    Instrumentation of a compact random-access photostimulator based on acousto-optic deflectors
    AIP Publishing ; 2012
    In:  Review of Scientific Instruments Vol. 83, No. 2 ( 2012-02-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 83, No. 2 ( 2012-02-01)
    Abstract: Recently developed optogenetics provides a fast, non-invasive, and efficient method for cell activation. However, it is difficult for the optical stimulators used for optogenetics to realize selective multi-site fast activation. In this paper, we developed a random-access photostimulator based on a pair of perpendicularly oriented acousto-optic deflectors. Precise laser targeting in the x-y plane was verified, and the lateral spatial resolution of laser intensity after the objective was measured as ∼1.38 μm. Photostimulaton of ChETA-expressing astrocytes induced reliable inward currents only if the laser beam was directed onto the targeted cell. In the ChR2-expresing neuron, multiple locations along two dendrites were stimulated, and spatiotemporal integration was observed in the soma with fast multi-site activation. These results demonstrated that this random-access photostimulator would be a powerful tool for selective multi-site fast activation. The compact and modular design of this photostimulator makes it easily integrated with different commercial microscopes, and thus widely popularized in many laboratories.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.3689954
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 2
    Online Resource
    Online Resource
    Comparative studies of yield strength and elastic compressibility between nanocrystalline and bulk cobalt
    AIP Publishing ; 2012
    In:  Journal of Applied Physics Vol. 111, No. 11 ( 2012-06-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 111, No. 11 ( 2012-06-01)
    Abstract: Comparative studies of yield strength and elastic compressibility between nanocrystalline and bulk cobalt were conducted using synchrotron x-ray diffraction under tri-axial pressure loading-unloading conditions. Relative to micron Co, nano Co exhibits higher flow stress (2.9 GPa compared with 2.1 GPa in micro Co), extra degree of strain-induced peak broadening during loading yet a better strain recoverability after unloading. These observations suggest different deformation mechanisms with intergranular strains dominated in nano Co and intragranular strains in micron Co. The determined bulk modulus for nano Co is 216 GPa, ∼17% higher than that of micron Co (185 GPa). This finding supports a generalized model of nanocrystals with pre-compressed surface layers and indicates that the grain-size induced elastic strengthening and weakening are primarily determined by the nature of internal stress (compressed vs. tensile) present in the surface layer of a nanocrystal.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4724338
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    Thermal equation of state of silicon carbide
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 108, No. 6 ( 2016-02-08)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 108, No. 6 ( 2016-02-08)
    Abstract: A large volume press coupled with in-situ energy-dispersive synchrotron X-ray was used to probe the change of silicon carbide (SiC) under high pressure and temperature (P-T) up to 8.1 GPa and 1100 K. The obtained pressure–volume–temperature data were fitted to a modified high-T Birch-Murnaghan equation of state, yielding values of a series of thermo-elastic parameters, such as the ambient bulk modulus KTo = 237(2) GPa, temperature derivative of the bulk modulus at a constant pressure (∂K/∂T)P = −0.037(4) GPa K−1, volumetric thermal expansivity α(0, T) = a + bT with a = 5.77(1) × 10−6 K−1 and b = 1.36(2) × 10−8 K−2, and pressure derivative of the thermal expansion at a constant temperature (∂α/∂P)T = 6.53 ± 0.64 × 10−7 K−1 GPa−1. Furthermore, we found the temperature derivative of the bulk modulus at a constant volume, (∂KT/∂T)V, equal to −0.028(4) GPa K−1 by using a thermal pressure approach. In addition, the elastic properties of SiC were determined by density functional theory through the calculation of Helmholtz free energy. The computed results generally agree well with the experimentally determined values.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4941797
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Thermal equation of state and thermodynamic Grüneisen parameter of beryllium metal
    AIP Publishing ; 2013
    In:  Journal of Applied Physics Vol. 114, No. 17 ( 2013-11-07)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 114, No. 17 ( 2013-11-07)
    Abstract: We conducted in-situ high-pressure synchrotron x-ray experiments on beryllium metal at pressures up to 7.9 GPa and temperatures up to 1373 K. A complete pressure (P)–volume (V)–temperature (T) equation of state (EOS) is determined based on the experiment, which includes temperature derivatives of elastic bulk modulus (at both constant pressure and constant volume) and pressure dependence of thermal expansivity. From this EOS, we calculate thermal pressure, heat capacity at constant volume, and thermodynamic Grüneisen parameter as a function of temperature. Above ∼600 K, our results show notable deviation from theoretical predictions using the quasiharmonic and local-density approximations, indicating that the free energy calculations need to be further improved within the current scheme of approximations.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4828886
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 5
    Online Resource
    Online Resource
    Thermal equation of state of TiC: A synchrotron x-ray diffraction study
    AIP Publishing ; 2010
    In:  Journal of Applied Physics Vol. 107, No. 11 ( 2010-06-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 107, No. 11 ( 2010-06-01)
    Abstract: The pressure–volume–temperature measurements were carried out for titanium carbide (TiC) at pressures and temperatures up to 8.1 GPa and 1273 K using energy-dispersive synchrotron x-ray diffraction. Thermoelastic parameters were derived for TiC based on a modified high-temperature Birch–Murnaghan equation of state and a thermal pressure approach. With the pressure derivative of the bulk modulus, K0′, fixed at 4.0, we obtain: the ambient bulk modulus K0=268(6) GPa, which is comparable to previously reported value; temperature derivative of bulk modulus at constant pressure (∂KT/∂T)P=−0.026(9) GPa K−1, volumetric thermal expansivity αT(K−1)=a+bT with a=1.62(12)×10−5 K−1 and b=1.07(17)×10−8 K−2, pressure derivative of thermal expansion (∂α/∂P)T=(−3.62±1.14)×10−7 GPa−1 K−1, and temperature derivative of bulk modulus at constant volume (∂KT/∂T)V=−0.015(8) GPa K−1. These results provide fundamental thermophysical properties for TiC for the first time and are important to theoretical and computational modeling of transition metal carbides.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3436571
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 6
    Online Resource
    Online Resource
    Tribological mechanism of hydrogenated amorphous carbon film against pairs: A physical description
    AIP Publishing ; 2011
    In:  Journal of Applied Physics Vol. 110, No. 3 ( 2011-08-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 110, No. 3 ( 2011-08-01)
    Abstract: The objective of the present study was to investigate the friction and wear mechanisms of hydrogenated amorphous carbon (a-C:H) films sliding against different counterparts. Friction tests were performed by a reciprocating ball-on-disk tribometer with an applied load of 5 N, amplitude of 5 mm, and frequency of 5 Hz, in ambient air at room temperature. The coefficient of friction (COF) was consistent with the varied tendency of the contact area of the counterparts on films and also coincided with the varied tendency of the coverage of transfer film on friction ball surface. It was important to point out that the coverage of the transfer film on the counterpart surface was inversely proportional to the contact area. Furthermore, COF of a-C:H films against different pairs was independent with the film graphitization level. Additionally, wear rate of a-C:H films against different friction pairs was discussed in details. Some indexes including hardness ratio of pair and film, elastic energy density of the friction pair, and effective plastic index were employed to predicting the wear behavior of the a-C:H films sliding against different counterparts. Compared with other indexes, the effective plastic index showed best performance. Description of physical meanings and some formula derivation of the effective plastic index of film with applied load were also performed in this work. The results increased our understanding of the physical mechanism of a-C:H films sliding against pairs, which were able to guide the application of a-C:H films in the future industrial fields.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3619798
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 7
    Online Resource
    Online Resource
    Thermal equations of state and phase relation of PbTiO3: A high P-T synchrotron x-ray diffraction study
    AIP Publishing ; 2011
    In:  Journal of Applied Physics Vol. 110, No. 8 ( 2011-10-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 110, No. 8 ( 2011-10-15)
    Abstract: The phase relation of tetragonal and cubic PbTiO3 and their unit-cell parameters have been determined by synchrotron x-ray diffraction at pressures up to 7.8 GPa and temperatures up to 1074 K with a cubic anvil apparatus. From these measurements, a pressure-temperature phase boundary between the tetragonal and cubic phases has been established. With increasing temperature or pressure, the c/a ratio of the ferroelectric, tetragonal PbTiO3 becomes closer to unity, suggesting that both heating and compression favor the paraelectric, cubic structure. Using a modified high-T Birch-Murnaghan equation of state and a thermal-pressure approach, we have derived the thermoelastic parameters of tetragonal and cubic PbTiO3, including the ambient bulk modulus K0, temperature derivative of bulk modulus at constant pressure, volumetric thermal expansivity, pressure derivative of thermal expansion, and temperature derivative of bulk modulus at constant volume. Our obtained K0 value for tetragonal PbTiO3 is consistent with previously reported results, while that for cubic PbTiO3 is smaller than earlier results probably due to differences in the experimental techniques used (cubic anvil apparatus versus diamond anvil cell) and related stress conditions of the samples. All other thermoelastic parameters for both tetragonal and cubic PbTiO3 have been determined for the first time. Compared with previous high-temperature data at atmospheric pressure, our P-V-T dataset for tetragonal PbTiO3 infers a pressure-induced crossover in volumetric thermal expansion from negative to positive between 0 and 1 GPa, an phenomenon that is of fundamentally interest and practically important.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3651377
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 8
    Online Resource
    Online Resource
    Thermal equation of state of copper studied by high P-T synchrotron x-ray diffraction
    AIP Publishing ; 2009
    In:  Applied Physics Letters Vol. 94, No. 7 ( 2009-02-16)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 94, No. 7 ( 2009-02-16)
    Abstract: The unit-cell volume of copper (Cu) has been measured by synchrotron x-ray at pressures and temperatures of up to 8.1 GPa and 1100 K. From pressure-volume-temperature (P-V-T) measurements, thermoelastic parameters of Cu were derived based on a modified high-T Birch–Murnaghan equation of state and a thermal pressure approach. The ambient bulk modulus derived from this work is comparable to previously reported value, whereas all other thermoelastic parameters of Cu have never been determined before. These results extend our knowledge of the fundamental thermophysical properties on Cu.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3085997
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 9
    Online Resource
    Online Resource
    Structural disorder, sublattice melting, and thermo-elastic properties of anti-perovskite Li3OBr under high pressure and temperature
    AIP Publishing ; 2020
    In:  Applied Physics Letters Vol. 117, No. 8 ( 2020-08-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 117, No. 8 ( 2020-08-24)
    Abstract: In situ synchrotron x-ray diffraction experiments were conducted in the system Li-O-Br at pressures up to 6.5 GPa and temperatures up to the melting points. The thermal equation of state determined from the P–V–T measurements indicates that crystalline anti-perovskite Li3OBr exhibits similar thermo-elastic properties to common salts. At temperatures that are 50–75 °C below the crystal melting, a pre-melting behavior was inferred based on weakened Bragg intensity and a substantial increase in the diffuse scattering. Concurrent with the onset of pre-melting, an anomalous increase in the lattice volume was observed and is interpreted as anion sublattice disorder. These findings support previous ab initio molecular dynamics simulations based on a simple anion interchange mechanism, indicating that structural disorder below crystal melting temperature can be a main driving force for Li-sublattice melting and superionic transition in the Li3OBr anti-perovskite.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0018714
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    The tunable wettability in multistimuli-responsive smart graphene surfaces
    AIP Publishing ; 2013
    In:  Applied Physics Letters Vol. 102, No. 1 ( 2013-01-07), p. 011603-
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 102, No. 1 ( 2013-01-07), p. 011603-
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4775360
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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