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We experimentally demonstrate optomechanically controlled second harmonic generation and two photon excited photoluminescence in microcavity coupled CdS nanoplates. The device can be used as a voltage reconfigurable single or dual wavelength light source.
In prior work, the AM-FM signal model coupled with dominant component analysis has been used for fingerprint extraction for eventual fingerprint recognition. In earlier work by the authors, multirate frequency transformations were employed to transform wideband signals into narrowband signals to effect wideband AM-FM demodulation of both 1D and 2D signals. In this paper, we apply the 2D, wideband...
Yellow (stripe) rust Puccinia striiformis has caused severe losses on wheat in yield and grain quality in China. As the largest land area devoted to wheat production, China has also the largest area prone to yellow rust epidemics. Traditionally, the disease assessment was visually investigated in the field by experienced farmers or pathologists. The emergency of hyperspectral measurements has distinct...
Because of the diversity of the fault diagnosis (FD) methods and the limit when they are applied to the on-board FD unit and the ground FD unit of spacecraft, conflict and divergence may exist in fault diagnosis results obtained by different methods. In order to realize the uniformity of the results, a space-earth fault diagnosis result merging algorithm based on weighted evidence theory (WET) is...
User information is needed for personalized services. Currently there are mainly two approaches to collect a user's information, explicit approach by acquiring information directly from the user and implicit approach by gathering the user's activities and behaviors almost without the user's awareness. This paper is to study a new approach, which gets a user's information from a Cyber-I that has kept...
With the rapid development of latest information technology, it is inevitable to apply IoT (Internet of Things), cloud computing and big data into the industrial fields of national key sectors including transportation, electricity, metallurgy, petroleum, chemical, manufacturing, military and so on. Wireless sensor network, industrial Internet, embedded system, software for industrial control and management,...
Existing approaches for wideband FM demodulation are based on negative feedback, frequency tracking or multirate signal processing and heterodyning. Prior work that utilizes multirate frequency transformations for wideband-FM demodulation is impractical for large wideband to narrowband conversion factors such as those needed in DRFM systems. In this paper, we present a frequency transformation approach...
A more comprehensive Markov chain is proposed in this paper of Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) in a practical narrowband power line communication (NPLC) unsaturated environment. The non-fixed transmission period is considered in this model which is determined by the dynamic resource management (DRM) algorithm employed in physical layer to resist the interference of NPLC...
Based on the analytical redundancy relations (ARRs), the fault diagnosability analysis and fault diagnosis problem of satellite attitude control system (ACS) is researched in this paper. To make sure the completeness of the ARRs set, the ARRs generation method utilizing the rank operation is proposed. And then the multilevel fault diagnosability of satellite attitude control system is supplied including...
This paper presents the long time reliability evaluation of a micromirror with double S-shaped unimorph piezoelectric (dSUP) actuator design using a probabilistic approach. The lifetime (number of cycles to failure) of the piezoelectric actuator, electrical strength, and electrical load are considered as the random variables; and their probability distributions are discussed. The interference model...
This paper presents the design, fabrication and characterization of a novel tip-tilt-piston (TTP) scanning micromirror based on an array of folded piezoelectric unimorph actuators. The micromirror can perform rotational scan around two in-plane orthogonal axes as well as out-of-plane piston motion. The measured resonant frequencies of the fabricated micromirror are 362 Hz (piston), 685 Hz (x axis...
Content-Centric Networking has recently emerged as a clean slate approach to rethink Internet foundations, which changes from host-centric communication model to content-centric model. However, one of the major challenges is supporting intelligent forwarding of Interests over multiple paths while keeping scalability and mobility. To address this challenge, this paper proposed an domain-based intelligent...
Modular Multilevel Converters (MMC) is an effective option for continuously growing demands of Voltage Sourced Converter based High Voltage Direct Current (VSC-HVDC) transmission. However, accurate modeling of MMC with high level in PSCAD/EMTDC is extremely time-consuming and hardware-requiring. Based on the Kirchhoff's Law, an equivalent accelerated model for MMC is proposed. The essence of the new...
Hybrid-HVDC is a new topology which is consisted of Line-Commutated-Converter (LCC) and Voltage Source Converter (VSC). It combines the advantages of LCC and VSC. Two topologies of Hybrid-HVDC were studied and found their application prospects. The structure which the rectifier station using VSC is suitable for connecting offshore wind farms, while the inverter station using VSC is suitable for supplying...
With the development of the smart grid, power line communications (PLC) is becoming more and more important. Compared with traditional modulation, Orthogonal Frequency Division Multiplexing (OFDM) has the advantages of the full use of spectrum, inherent robustness against narrowband interference, and excellent robustness in multi-path environments. This article is devoted to compare FFT-based OFDM...
In Long Term Evolution (LTE) networks, Energy-Efficient (EE) and Mobility Load Balancing (MLB) are two important functions to optimize the network performance. In order to deal with the energy consumption in downlink LTE system for unbalanced low load scenarios, we built an effective EE resource allocation optimization model and employed a low complexity method to achieve the goal of the optimization...
This paper presents the design, fabrication and characterization of a high-fill-factor tip-tilt-piston (TTP) micromirror which employs four symmetrical lateral-shift-free (LSF) piezoelectric actuators. Lead zirconate titanate (PZT) is the piezoelectric material deposited using a sol-gel process. The measured resonant frequencies of the fabricated micromirror are 990 Hz (piston) and 1450 Hz (rotation),...
In order to resolve the conflict between Load Balancing (LB) and Mobility Robustness Optimization (MRO) in Long Term Evolution (LTE) networks, a conflict avoid method has been proposed. However, the speed of users is neglected in the existing scheme, which has an obvious effect on system performance. To this end, we propose a new method, called the optimal conflict avoidance (OCA), which can set the...
to solve the problem of difficulty and low efficiency in modeling of the overall tower, this paper puts forward finite element modeling method based on tower modular. Putting 2Z2E3 type tower as a carrier, the modularization theory as guidance, using large finite element software ANSYS, this tower was modular analyzed, such as division, establishment and assembly of module and the modal analysis of...
This paper presents the design and characterization of an electrothermally actuated high-fill-factor tip-tilt-piston (TTP) micromirror and its application to three-dimensional (3D) photoacoustic imaging (PAI). The micromirror chip is 2mm × 2mm. It has large scan range (>25°) at low driving voltage (∼4V) and can perform fast raster scanning. A miniature PAI probe with a diameter of 11.5 mm has been...
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