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This paper explains the exact mechanism of governmental intervention in the process of economic system reform through the intervention index model and the evolutionary game model. The results show that the government should keep the principle of moderate guidance in the mixed ownership reform process under the consideration of both the political objectives and market efficiency. Meanwhile, the government...
As one of the fastest-growing imaging modalities in recent years, photoacoustic imaging has attracted tremendous research interest for various applications including anatomical, functional and molecular imaging. Majority of the photoacoustic imaging systems are based on time-domain pulsed photoacoustic method, which utilizes pulsed laser source to induce wideband photoacoustic signal revealing optical...
Silicon photonics provides an excellent platform for scaling photonic system-on-chip complexity and bandwidth. We continue to see chip complexity doubling every 12–18 months.
In order to enhance the stability of grid-connected modular multilevel converters (MMC) system, which has become a prominent topology as an alternative to conventional voltage source converter in applications for high voltage, a novel single-phase circulating current suppressing strategy is proposed. This paper studies the mechanism and model of circulating currents of a single-phase MMC system at...
The present study provides a new facile route for hybrid piezoelectric nanogenerator based on a composite of piezoelectric formamidinium lead halide perovskite (FAPbBr3) nanoparticles and polydimethylsiloxane (PDMS) polymer. The piezoelectric device exhibits high performance with a maximum recordable output voltage of 8.5 V and current density of 3.8 & #x00B5;Acm-2 under periodical vertical compression...
In this paper, we will introduce some recent research progress on nonlinear electromagnetic (EM) acoustic sensing and imaging techniques. Being different from the conventional linear EM-acoustic technique based on pulsed EM illumination and impulse response of the object, the nonlinear EM-acoustic technique utilizes various ways of nonlinear enhancement ways, including resonance, mixing, thermal modulation,...
This paper proposes an improved midpoint potential balancing method that reduces deviation of DC capacitor voltages of T-type three-level inverter. In the proposed balancing strategy, the 60° coordinate is used to avoid sophisticated calculation of trigonometric function, and a simplified balance factor is set in each region of virtual space vector diagram. All values of the simplified balance factor...
Fault current limiter (FCL) is one of the efficient technological measures to solve the increasingly serious problem of excessive short-circuit current in power grid. A fast breaker-type fault current limiter with modularized design is developed on the basis of 12kV fast-speed vacuum breakers and short-circuit current perfect forecast and zero-cross point precise phase controlled breaking technologies...
Silicon photonics offers great opportunities to replace the bulky free-space systems with compact, highly integrated ones. However, dedicated optimization work is required to realize high performance systems for practical applications. This talk presents a library of optimized photonic components and a high-performance system as example.
We demonstrate BPSK modulation using a silicon traveling-wave modulator at data rate up to 48 Gb/s, with 7.4 Vpp differential RF driving voltage. The performance of the silicon BPSK modulator is compared with a commercial Lithium Niobate phase modulator, showing better dispersion tolerance.
A programmable control system for wavelength locking WDM channels on microring arrays is used to demonstrate arbitrary demultiplexing and selection of fast switchable wavelengths. Successful data measurements verify the functionality within an interconnection network implementation.
A low-power 40 Gb/s optical receiver is reported. The receiver consists of a broadband photodiode followed by a low-noise transimpedance amplifier front-end, a 3-stage Cherry-Hooper limiting amplifier, an output driver, and an offset cancellation network. The photodiode is fabricated in a 0.18 µm Ge-on-SOI process and the electronic chip is fabricated in a 0.13 µm SiGe BiCMOS process. The receiver...
We demonstrate BPSK modulation using a silicon traveling-wave modulator at a data rate of 40 Gb/s with record 10.5 pJ/bit energy efficiency, and compare its performance with a commercial Lithium Niobate phase modulator.
We demonstrate a polarization-insensitive silicon photonic receiver operating with 4 × 40 Gb/s wavelength channels at 6.5 nm spacing. The integrated receiver is shown to have <1.2 dB polarization dependent loss and no measured polarization-dependent wavelength shift.
Air handler unit (AHU) is considered as the main part of the HVAC system consuming nearly half of the total energy. Airflow blockage and leakage has become a significant problem in AHU recently. This paper describes an electrical measurement based study and mainly focuses on the airflow blockage fault detection and the estimation of insufficient airflow. It proposes a relatively simple airflow fault-detection...
Silicon photonic microring modulators (MRMs) offer a promising approach for realizing energy-efficient wavelength-division multiplexing (WDM) optical interconnects. For data-rates greater than 10Gb/s, depletion-mode MRMs are generally preferred over their injection-mode counterparts due to their shorter carrier lifetimes and resulting higher bandwidths. Unfortunately, these depletion-mode MRMs typically...
The paper introduced the structure of Urban Mass Transit Operation Decision system and the functions of individual sub-systems. It determined five major functions of Basal-Net Reusability Control, such as UMT net edit, UMT net display, passenger flow simulation, the train operation simulation, huge passenger flow simulation, which depended on the needs of individual sub-systems. It analyzed the basic...
We present the design and characterization of a broadband, low-noise transimpedance amplifier (TIA) with adjustable gain-peaking, implemented in 65-nm CMOS. The TIA exhibits 40-GHz bandwidth, 20-dB gain and consumes 107 mW power. An additional continuously-tunable 12-dB gain-peaking near 40 GHz is available through a simple yet effective tuning mechanism, consuming only 14% more power. The adjustable...
Optical interconnects, which support the transport of large bandwidths over warehouse-scale distance, can help to further scale data-movement capabilities in high performance computing (HPC) platforms. However, due to the circuit switching nature of optical systems and additional peculiarities, such as sensitivity to temperature and the need for wavelength channel locking, optical links generally...
We investigate the performance of a high-speed optical switch for optically connected memory and study free-carrier absorption losses as the switch scales. The bit-rate dependent optical power budget is also analyzed for optically connected memory.
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