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The sensor-source geometry is one of the key factors affecting the performance of a distributed acoustic source localization system. In this paper, an approximate optimal routing method is proposed by minimizing the determinant of the Cramer Rao Lower Bound (CRLB) for the source location estimate. At first the sensors are equally distributed in the test field, the problem is relaxed to a combinatorial...
Sensor placement is an important issue for distributed sensor network design, especially when it is used for collaborative tasks (e.g., source localization and tracking). In this paper, the averaged Cramer-Rao Lower Bound (CRLB) of TDOA-based sensor network localization system is derived at first in a more practical scenario where the variance of the Time Of Arrival (TOA) estimate error of each sensor...
In this paper the performance of the acoustic localization method based on TDOA is studied. The statistical source localization error of this algorithm is derived using Taylor-series expansion method. Compared with the theoretical presentation, the impacts of the time delay estimation error and the sensor node number on the localization error are demonstrated by several simulations. Besides, we study...
In this paper, we synthesized α-tetra-(p-carboxyphenoxy) phthalocyanine zinc (ZnPc-COOH) by microwave irradiation method, and SiO2/ZnPc-COOH by using 3-aminopropyltriethoxysilane (APTES) as the coupling agent. Their structural and optical properties were characterized by 1HNMR, MS, IR, SEM, TEM, XRD, TG, etc. The synthesized SiO2/ZnPc-COOH has a porous structure with a 13nm film of ZnPc-COOH attached...
If two electrodes are stressed with a high voltage which creates a sufficiently strong electric field between the electrodes, the underwater pulsed discharge will happen. Then a strong shockwave is eradiated from the electrodes. Through focusing, the direction and the sound level can be enhanced obviously. In order to obtain the propagation rule of the focusing shockwave, the finite element model...
This article deals with a kind of plastic honeycomb core composite board which has simple processing technology, light quality, pleasant appearance and can be waterproof, moisture-proof, pollution-free, scientific and environmental protection. The core content of this article is how to select the most appropriate cellular diameter through the design concept to ensure the compressive strength and material...
Social capital is the function of trust, norm and network. The labor division and collaboration formed by the infinitely repeated games have resulted in the development of trust, norm and network, which are the performance for the improving of the quality of social capital in the industrial clusters. In the reasonable industrial clusters?? scale, the strategy of collaboration that the actors in industrial...
This paper overviews home and abroad time estimation technology and methods for vehicle travel, then it puts forward trip time estimation model for buses based on urban bus travel information service platform. Considered walking time, waiting time and travel time, the linear regression model was built to predict travel time. As an example, Beijing Bus 300 is illustrated. The result shows that the...
In this paper, we propose a new estimator of DOA called synthetic spatial spectrum method (SSM). The estimator is synthesized with signal subspace projection method and noise subspace projection method, which is classical MUSIC spatial-spectra algorithm. The signal subspace projection is weighted with reciprocal of principle eigenvalue. For two closely spaced emitters, the proposed SSM efficiently...
The rheological behavior of ∼100nm barium titanate (BaTiO 3 ) powder aqueous suspension has been investigated over a wide range of volumetric solids loading (ϕ = 0.1–0.53), in which ammonium polyacrylate (NH 4 PA) was used as a dispersant. The dependence of relative viscosity (η r )–solids loading (ϕ) determined experimentally was compared with various existing models. The...
The effects of mixing factors (stirrer speed, feed time, feed location and viscosity) on particle size distribution (PSD) in the precipitation of BaSO 4 conducted in a semi-batch stirred tank reactor were investigated. It was found that there exist critical points on the curves of mean size and dimensionless variance versus the mixing factors, at which the mean size or the dimensionless variance...
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