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A wavelength scanning system with ultrahigh-resolution is proposed and demonstrated for displacement sensing. Light from a linewidth-narrowed and frequency-stabilized laser is put into an electro-optic modulator (EOM) which is connected to a microwave source (MS), and the frequency of the radio frequency (RF) signal output from the MS is set to scan from 2.3 GHz to 6.5 GHz with a high resolution covering...
Merging units (MUs) sample alternating current (AC) in one or multiple phases and convert these analog voltage and current signals to digital values and transmit the sampled values (SVs) to protection relays (PRs) and bay controllers (BCs) through either Ethernet or optical communication channels based on the IEC 61850-9-2 protocol. MUs could provide real-time data for current, voltage, and status...
Optical network is the backbone of modern data communication. The relevant maintenance technologies are of fundamental importance if the reliability of optical communication network is required. However, traditional monitoring and diagnosing methods such as the Rayleigh back-scattering (RBS) based optical time-domain reflectometry (OTDR) and coherent OTDR (COTDR) are only suitable for static measurement...
In view of the strongly nonlinear characteristic of electro-hydraulic servo system (EHSS), this paper aims to conduct nonlinear ordinary differential equation (ODE) parameter identification of white-box model based on the knowledge of part of the system information so as to get the accurate nonlinear model that can meet the actual needs. By establishing the state space model of the hydraulic system...
Based on the exponentiated Weibull distribution of scintillations, transmit lasers selection combining (SC) method, intensity modulation/ direct detection with on-off keying modulation, the optimization of an adaptive tracking free-space optical (FSO) communication link with single-input multiple-output (SIMO) is investigated. The closed-form mathematical expression for average bit error rate is derived...
Freshwater protection is one of the key issues for environment protection. In this paper we propose novel techniques to remotely monitor freshwater quality in river system using wireless sensor networks (WSNs). In order to maximize the performance in water quality monitoring with minimum amount of sensor nodes, we have studied optimal sensor deployment algorithm based on graph theory, genetic algorithm...
Interconnection networks play an important role in parallel computing systems. A lot of effort has been made to construct rearrangeable networks. This paper generalizes the concept of rearrangeability to general, directed graphs. Given a directed graph G =(V,E ), where V = 1, 2, ..., n, an n-permutation π is said to be realizable on G if there exist n edge-disjoint paths in G that connect vertex i...
We have proposed and experimentally demonstrated a distributed vibration and temperature sensing system based on the hybrid of phase-sensitive optical time domain reflectometry (Φ-OTDR) and fiber Bragg grating (FBG). An interrogation technique has been proposed by treating the low reflectivity Gaussian-shaped FBGs pair as an edge filter that linearly translates the wavelength shift into reflection...
Brillouin Optical Time Domain Reflectometry (BOTDR) has the ability to measure strain and temperature continuously in a fiber. It can be applied in the health structural monitoring for large-scale civil project such as bridges, dams and smart grid. Pulse coding/decoding technique can improve Signal to Noise Ratio (SNR) of BOTDR signal. However, at present, the data process of pulse coding/decoding...
One scheme of novel DRFM Jamming source based on Analysis Filter Bank (AFB) / Synthesis Filter Bank (SFB) and an optimized modulation method is proposed. Then two important issues relative to the source realization are discussed in detail. One is the channel number determination for ASFB and the other is hardware resource requirement estimation for modulation module. Finally, one prototype of the...
The paper chooses the emission quota of three wastes of electricity and heat production and supply during 1995–2009. It inspects and inters the environment pollution caused by the industry and its impact on economic development from the angel of chronological sequence. First of all, we use ADF unit root test to the environment pollution data and economic development guideline, so that the stability...
CO2 fixation by marine micro-algae cultivation has the potential to diminish the emission of CO2. To select the proponent micro-algae species this is vital to realize workable biological CO2 fixation systems, three kinds of candidate energy marine algal strain were cultivated and tested for bio-fixation of CO2 from power plant flue gas. It was found that Chlorella was the most appropriate strain for...
This paper describes the world's first field trial of XG-PON, which can deliver 10 Gbps downstream and 2.5 Gbps upstream to residential or business customers, and confirmed XG-PON's co-existence with a commercially deployed G-PON system.
The development of fiber networks raises the requirements of a low cost fusion splicer for smaller size and lighter weight. To meet these requirements, the number of components of a fusion splicer shall be reduced and components should be integrated. In this paper, a microprocessor based fusion splicer along with its alignment algorithm is presented. We focus on the alignment algorithm of single-mode...
A unique solar technology is entering the competitive utility-scale power plant market. This solar dish-Stirling technology combines a mirrored concentrator dish with a high-efficiency Stirling engine specially designed to convert sunlight to electricity. In the next a few years, two large-scale power plants will be constructed in California using this innovative technology with a potential total...
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