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  • AIP Publishing  (11)
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  • AIP Publishing  (11)
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  • 1
    Online Resource
    Online Resource
    Thermally oxidized formation of new Ge dots over as-grown Ge dots in the Si capping layer
    AIP Publishing ; 2011
    In:  Journal of Applied Physics Vol. 110, No. 11 ( 2011-12-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 110, No. 11 ( 2011-12-01)
    Abstract: A Si-capped Ge quantum dot sample was self-assembly grown via Stranski-Krastanov mode in a molecular beam epitaxy system with the Si capping layer deposited at 300 °C. After annealing the sample in an oxygen atmosphere at 1000 °C, a structure, namely two layers of quantum dots, was formed with the newly formed Ge-rich quantum dots embedded in the oxidized matrix with the position accurately located upon the as-grown quantum dots. It has been found that the formation of such nanostructures strongly depends upon the growth temperature and oxygen atmosphere. A growth mechanism was proposed to explain the formation of the nanostructure based on the Ge diffusion from the as-grown quantum dots, Ge segregation from the growing oxide, and subsequent migration/agglomeration.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3665398
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    Thrust stand for low-thrust liquid pulsed rocket engines
    AIP Publishing ; 2010
    In:  Review of Scientific Instruments Vol. 81, No. 9 ( 2010-09-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 81, No. 9 ( 2010-09-01)
    Abstract: A thrust stand is developed for measuring the pulsed thrust generated by low-thrust liquid pulsed rocket engines. It mainly consists of a thrust dynamometer, a base frame, a connecting frame, and a data acquisition and processing system. The thrust dynamometer assembled with shear mode piezoelectric quartz sensors is developed as the core component of the thrust stand. It adopts integral shell structure. The sensors are inserted into unique double-elastic-half-ring grooves with an interference fit. The thrust is transferred to the sensors by means of static friction forces of fitting surfaces. The sensors could produce an amount of charges which are proportional to the thrust to be measured. The thrust stand is calibrated both statically and dynamically. The in situ static calibration is performed using a standard force sensor. The dynamic calibration is carried out using pendulum-typed steel ball impact technique. Typical thrust pulse is simulated by a trapezoidal impulse force. The results show that the thrust stand has a sensitivity of 25.832 mV/N, a linearity error of 0.24% FSO, and a repeatability error of 0.23% FSO. The first natural frequency of the thrust stand is 1245 Hz. The thrust stand can accurately measure thrust waveform of each firing, which is used for fine control of on-orbit vehicles in the thrust range of 5–20 N with pulse frequency of 50 Hz.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.3481788
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Photodissociation dynamics of CS2 near 204 nm: The S(3P J )+CS( X 1Σ+) channels
    AIP Publishing ; 2021
    In:  Chinese Journal of Chemical Physics Vol. 34, No. 1 ( 2021-02-01), p. 95-101
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 34, No. 1 ( 2021-02-01), p. 95-101
    Abstract: We study the photodissociation dynamics of CS2 in the ultraviolet region using the time-sliced velocity map ion imaging technique. The S(3PJ)+CS(X1Σ+) product channels were observed and identified at four wavelengths of 201.36, 203.10, 204.85 and 206.61 nm. In the measured images of S(3PJ=2,1,0), the vibrational states of the CS(X1Σ+) co-products were partially resolved and the vibrational state distributions were determined. Moreover, the product total kinetic energy releases and the anisotropic parameters were derived. The relatively small anisotropic parameter values indicate that the S(3PJ=2,1,0)+CS(X1Σ+) channels are very likely formed via the indirect predissociation process of CS2. The study of the S(3PJ=2,1,0)+CS(X1Σ+) channels, which come from the spin-orbit coupling dissociation process of CS2, shows that nonadiabatic process plays a role in the ultraviolet photodissociation of CS2.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp2010183
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 4
    Online Resource
    Online Resource
    Low-phase noise and high-power laser for Bragg atom interferometer
    AIP Publishing ; 2017
    In:  AIP Advances Vol. 7, No. 9 ( 2017-09-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 7, No. 9 ( 2017-09-01)
    Abstract: We present a laser system with low-phase noise and an output power up to 8.8 W at 780 nm for driving Bragg transitions in a   87Rb fountain. An optical phase-locked loop (OPLL) is employed to restrain the phase noise that arises from the spatial separation of the two Bragg beams at low frequencies. The residual phase variance is suppressed by two orders around 400 Hz. A Mach-Zehnder Bragg atom interferometer, based on the four-photon recoil scheme, has been realized using this laser system. This interferometer shows a resolution of 5×10−9g at an integration time of 1200 s for gravity measurements.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5001963
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 2583909-3
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  • 5
    Online Resource
    Online Resource
    Performance of perpendicular magnetic recording with track squeeze using bidirectional pattern-dependent noise prediction detector
    AIP Publishing ; 2015
    In:  Journal of Applied Physics Vol. 117, No. 17 ( 2015-05-07)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 117, No. 17 ( 2015-05-07)
    Abstract: In this study, we investigated the performance of perpendicular magnetic recording with squeezed tracks. Based on spinstand signals, we developed a signal generation module to generate the readback signals for tracks of various squeezed track width and bit length. To mitigate the drop in bit error rate (BER) as squeezed track width decreases, we implemented the bidirectional pattern-dependent noise prediction (BiPDNP) detector with low-density parity check codes. To improve the BiPDNP detector over earlier work, we modified the log-likelihood ratio computation. Our results show that our proposed BiPDNP detector improves the bit error rate, and allows smaller squeezed track width and smaller bit length for the same BER performance.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4913899
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 6
    Online Resource
    Online Resource
    Theoretical insight on the charge transport properties: The formation of “head-to-tail” and “head-to-head” stacking of asymmetric aryl anthracene derivatives
    AIP Publishing ; 2023
    In:  The Journal of Chemical Physics Vol. 158, No. 17 ( 2023-05-07)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 158, No. 17 ( 2023-05-07)
    Abstract: Organic semiconductors (OSCs) are widely used in flexible display, renewable energy, and biosensors, owing to their unique solid-state physical and optoelectronic properties. Among the abundant crystal library of OSCs, asymmetric aryl anthracene derivatives have irreplaceable advantages due to the interplay between their distinct π-conjugated geometry and molecular stacking as well as efficient light emission and charge transport properties that can be simultaneously utilized. However, the poor crystal stacking patterns of most asymmetric molecules limit their utility as excellent OSCs. Thus, it is crucial to clarify the structural features that enable the extremely ordered stacking and favorable electronic structure of asymmetric anthracene derivatives to become high-performance OSCs. This contribution investigates the charge transport properties of a series of asymmetric aryl anthracene derivatives to reveal the modulation factors of the molecular stacking modes and to explore the structural factors, which are beneficial to charge transport. The analysis demonstrated that the vinyl-linker facilitated the injection of hole carriers, and the alkynyl-linker effectively reduces the reorganization energy. Importantly, the linear polarizability and permanent dipole moment of a single molecule play a vital regulation to molecular stacking modes and the transfer integral of the dimer. The “head-to-head stacking” motif shows a compact stacking pattern and the maximum 2D anisotropic mobility more than 10 cm2 V−1 s−1. These findings sharpen our understanding of the charge transport properties in asymmetric organic semiconductors and are essential for developing a diverse range of high-performance OSC materials.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0139904
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 7
    Online Resource
    Online Resource
    Laser-driven shock wave stability in Al through Au and determination of the TPa hugoniot point in Au
    AIP Publishing ; 2008
    In:  Journal of Applied Physics Vol. 103, No. 9 ( 2008-05-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 103, No. 9 ( 2008-05-01)
    Abstract: High-quality shock waves were produced using the ninth laser beam (converted to 2ω) of Shenguang-II laser facility and the beam smoothing technology of a lens array. The spatial uniformity of the shock wave was estimated by measurements of the self-emission from the target rear surface. An Al–Au four-step target with 30μm Al base and four Au steps was fabricated and used to investigate the temporal steadiness of the shock wave in the Al–Au two-layer target. The Al–Au four-step target experiment indicated that the shock wave steadily propagated in the Au material with thickness range & lt;11μm. A modified Al–Au impedance-match target was designed, which could simultaneously measure shock-wave stability and Au Hugoniot data in one shot. The experiment results indicated that the shock wave steadily propagated in the Al target with thickness of about 30–47μm under a power density of ∼1.0×1014W∕cm2.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2838164
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 8
    Online Resource
    Online Resource
    Nonequilibrium atmospheric pressure plasma jet using a combination of 50 kHz/2 MHz dual-frequency power sources
    AIP Publishing ; 2013
    In:  Physics of Plasmas Vol. 20, No. 11 ( 2013-11-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 20, No. 11 ( 2013-11-01)
    Abstract: An atmospheric pressure plasma jet is generated by dual sinusoidal wave (50 kHz and 2 MHz). The dual-frequency plasma jet exhibits the advantages of both low frequency and radio frequency plasmas, namely, the long plasma plume and the high electron density. The radio frequency ignition voltage can be reduced significantly by using dual-frequency excitation compared to the conventional radio frequency without the aid of the low frequency excitation source. A larger operating range of α mode discharge can be obtained using dual-frequency excitation which is important to obtain homogeneous and low-temperature plasma. A larger controllable range of the gas temperature of atmospheric pressure plasma could also be obtained using dual-frequency excitation.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.4828720
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 1472746-8
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  • 9
    Online Resource
    Online Resource
    A car-based portable atom gravimeter and its application in field gravity survey
    AIP Publishing ; 2021
    In:  AIP Advances Vol. 11, No. 11 ( 2021-11-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 11, No. 11 ( 2021-11-01)
    Abstract: As a novel instrument for measuring absolute gravity, the atom gravimeter has shown high sensitivity and stability in the past three decades. In this work, we report a car-based portable atom gravimeter whose sensitivity is at the level of 1.9mGal/Hz (1 Gal = 0.01 m/s2) both for lab and outdoor measurements. Its resolution can reach 30 μGal within an integration time of 10 000 s when located in a quiet place. During four months of gravity observation, there is no drift for the measurement result, showing that this car-based gravimeter has a competitive advantage at long term stability. By using this car-based atom gravimeter in the open air, the field gravity measurements with sub-mGal performance have been demonstrated in the mountain gravity survey. According to the gravity measurement results from our car-based atom gravimeter, the density distribution of this mountain is inverted, which is consistent with the result from the geological exploration.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0068761
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2583909-3
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  • 10
    Online Resource
    Online Resource
    Tripling energy storage density through order–disorder transition induced polar nanoregions in PbZrO3 thin films by ion implantation
    AIP Publishing ; 2023
    In:  Applied Physics Reviews Vol. 10, No. 1 ( 2023-03-01)
    Details
    In: Applied Physics Reviews, AIP Publishing, Vol. 10, No. 1 ( 2023-03-01)
    Abstract: Dielectric capacitors are widely used in pulsed power electronic devices due to their ultrahigh power densities and extremely fast charge/discharge speed. To achieve enhanced energy storage density, maximum polarization (Pmax) and breakdown strength (Eb) need to be improved simultaneously. However, these two key parameters are inversely correlated. In this study, order–disorder transition induced polar nanoregions have been achieved in PbZrO3 thin films by making use of the low-energy ion implantation, enabling us to overcome the trade-off between high polarizability and breakdown strength, which leads to the tripling of the energy storage density from 20.5 to 62.3 J/cm3 as well as the great enhancement of breakdown strength. This approach could be extended to other dielectric oxides to improve the energy storage performance, providing a new pathway for tailoring the oxide functionalities.
    Type of Medium: Online Resource
    ISSN: 1931-9401
    URL: Article
    DOI: 10.1063/5.0102882
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2265524-4
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