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  • IOP Publishing  (4)
  • 1
    Online Resource
    Online Resource
    IOP Publishing ; 2010
    In:  Journal of Physics D: Applied Physics Vol. 43, No. 24 ( 2010-06-23), p. 245102-
    In: Journal of Physics D: Applied Physics, IOP Publishing, Vol. 43, No. 24 ( 2010-06-23), p. 245102-
    Abstract: By introducing the concept of ‘minifying layer’, we propose a universal device to hide the position of an object by shifting its scattering without a scaling effect for distance, independent of the direction of incident wave and observation. Unlike the previously reported similar cloaks whose configurations are relevant to the objects to be cloaked, the design here is able to shift the scattering of various objects by one cloak. Moreover, by adjusting the parameter of the ‘minifying layer’, a tunable magnifying or even minifying effect on the shifted scattering can also be achieved. The performances of the devices are demonstrated by finite element simulations. This design provides a more flexible way to shift the scattering of an object, and thus can be expected to have wide applications.
    Type of Medium: Online Resource
    ISSN: 0022-3727 , 1361-6463
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 209221-9
    detail.hit.zdb_id: 1472948-9
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  • 2
    Online Resource
    Online Resource
    IOP Publishing ; 2023
    In:  Journal of Physics: Conference Series Vol. 2537, No. 1 ( 2023-06-01), p. 012013-
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2537, No. 1 ( 2023-06-01), p. 012013-
    Abstract: With the accelerating growth of railway operating mileage in China, ensuring the safety of railway operations has become a critical problem. According to some previous studies, the railway foreign body invasion limit is a major threat to the safe operation of the railway. As the current stage mainly adopts the combination of manual inspection and video monitoring, it has some disadvantages, such as being time-consuming, laborious, and inefficient. Meanwhile, it cannot timely detect potential danger. Therefore, the research on the simulation of railway foreign body intrusion systems based on single-chip microcomputers is carried out. The program is compiled in C language and uses the microcontroller to achieve real-time foreign object detection and alarm for encroachment. This paper mainly introduces the principle of the system and uses Proteus software to design and simulate the circuit. Last but not least, welding is carried out according to the circuit diagram, and the physical test is carried out to verify the feasibility of the design.
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2166409-2
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  • 3
    Online Resource
    Online Resource
    IOP Publishing ; 2019
    In:  Journal of Physics: Conference Series Vol. 1187, No. 4 ( 2019-04), p. 042027-
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1187, No. 4 ( 2019-04), p. 042027-
    Type of Medium: Online Resource
    ISSN: 1742-6588 , 1742-6596
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2166409-2
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  • 4
    Online Resource
    Online Resource
    IOP Publishing ; 2023
    In:  Laser Physics Vol. 33, No. 8 ( 2023-08-01), p. 085001-
    In: Laser Physics, IOP Publishing, Vol. 33, No. 8 ( 2023-08-01), p. 085001-
    Abstract: We reported a high-efficiency, broad-linewidth, wide-tuning-range singly-resonated optical parametric oscillator (OPO) based on a fan-out PPLT crystal. When the PPLT crystal was operated at 120 °C and pumped by Q-switched 1064 nm laser at 14.17 W with a circular pump profile, the overall output power of OPO was 7.22 W ( η = 50.4%) for both the signal and idler waves. The central wavelength and linewidth of the mid-infrared (MIR) laser were 3770 nm and ∼40 nm. A wavelength tuning range of 3538–3941 nm was accomplished by adjusting the crystal period through simple mechanical movement. Due to the larger coverage of gratings with an elliptical pump profile, the output linewidth of the MIR laser was further broadened to ∼100 nm, which is ten times more than other non-fan-out PPLT OPOs. Both pumping methods with different profiles were operated at 30 kHz, 49.2 ns for the 1064 nm laser, the power fluctuation of the obtained MIR laser was within 3.5%.
    Type of Medium: Online Resource
    ISSN: 1054-660X , 1555-6611
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2228434-5
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