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This paper described a novel directional underwater thruster which could change thrust directions without any moving parts. When the underwater thruster moved along a non-vertical angle, it could produce straight backward thrust of 2.3mN and lateral thrust of 0.6mN in parallel on the device surface, with the total thrust/weight ration of 2:1. Water jet was streamed out by high intensity acoustic beam...
The inherent features of Voltage Source Converters (VSCs) are attractive for practical implementation of Multi-Terminal HVDC transmission systems (MTDC). MTDC can be used for large-scale integration of offshore wind power with onshore grids. However, many of the control strategies for MTDC that have been proposed previously for offshore wind farm integration depend on local control of the wind turbine...
Triangular patch resonators have important applications in microwave filters and antennas design. In this report, new isosceles right-angled triangular patch resonator bandpass filters with two-path coupling are developed to perform dual-passband, low passband insertion loss and miniaturization, and performances of the proposed filters are compared. New dual-band bandpass filter using single right-angled...
Unsupervised clustering of objects is often needed for image and video summarization, tracking and segmentation. Shape, as fundamental representation of objects, is hard to do clustering task since usual clustering algorithms need quantitative features which are very hard to extract in shapes. In this paper, we proposed a novel approach to shape clustering. To overcome the difficulty of extracting...
Natural image matting is one of the major challenges in modern image editing, whose goal is to estimate fractional opacity of foreground layer from an image and recover the colors of the foreground/background layers respectively. Most of existing methods require complicated mathematics computation and are implemented on a single processor. The closed-form matting [1] is relatively faster and more...
This paper presents a novel approach to hierarchical shape classification. We combine two shape features: contour and skeleton. Weights of two features are learned through large-margin optimization. The proposed approach uses a shape tree to efficiently represent the similarity of different shape classes. The tree is generated offline by a bottom-up clustering approach using stochastic optimization...
Fully autonomous vehicles are technologically feasible with the current generation of hardware, as demonstrated by recent robot car competitions. Dresner and Stone proposed a new intersection control protocol called Autonomous Intersection Management (AIM) and showed that with autonomous vehicles it is possible to make intersection control much more efficient than the traditional control mechanisms...
With continuous scaling in transistor size, there is demand to develop advanced FIB techniques for TEM failure analysis. Two techniques are reported here: 1) consecutive planar-cross section sample preparation for dual-direction TEM analysis and, 2) enhanced coating method for photo resists profile evaluation. Both the techniques have been successfully applied on deep sub-micron device issues which...
Nano Beam Diffraction has been used to analyze the local strain distribution in MOS transistors. The influence of wafer process on the channel strain has been systematically analyzed in this paper. The source/drain implantation can cause a little strain loss but the silicidation step is the key process in which dramatic strain loss has been found.
The study area is physiogeographically located along the western flank of Songnen Plain, and hydrogeochemically distinguished as a basin with groundwater generally flowing easterly. A total of 196 groundwater samples were collected to not only cover the whole study area but also to extend in different aquifers that include Quaternary phreatic groundwater, Quaternary Baitushan Formation confined groundwater...
This study presents the direct numerical simulations (DNS) of bubbly wake flows. The DNS with Lagrangian particle dynamics (LPD) model is applied to the cases of bubble dispersion over a cylinder and a hydrofoil. The model validation is performed on the experimental data for the bubble behaviour in the wake of a circular cylinder. It is confirmed that the simulated distributions of bubble stream agree...
In this paper, a new method called fast directional multilevel algorithm is preconditioned by an efficient Calderon multiplicative preconditioner (CMP) for three-dimensional (3-D) electromagnetic problems. The new algorithm does not require the implementation of multipole expansions of the Green's function but based only on kernel evaluations. Combined with the Caldron identities of the CMP, the new...
Today, most autonomous mobile robots rely on centralized perception and processing. They are, however, facing difficulties to be reliable and efficient due to uncertainties introduced from dynamic environments. In this paper, an intelligent environment with distributed visual sensors to support navigation and control of mobile robots, wireless mosaic eyes, is reported. The distributed visual sensors...
Ultra-broadband amplitude modulation for spectral-shifted pulse pair generation is realized by a liquid-crystal spatial light modulator. The results indicate that it's a promising way for single attosecond pulse characterization by the conventional SPIDER method.
We present the complete characterization of single attosecond pulses by the modified cSPIDER method with a frequency-dependent spectral shear. The validity of this method shows no cprinciple limitation of characterizing arbitrary short single attosecond pulses.
Magnetoelectric (ME) nanocomposite materials have attracted much interest due to the coupling among the electric, magnetic, and elastic order parameters and the ME effect, In this paper, the ??sandwich?? structure ME composite films of PZT/ NiFe2O4 (NFO)/PZT and PZT/CoFe2O4(CFO)/PZT were epitaxially grown on SrRuO3/STO substrates by pulsed laser deposition (PLD). The effects of strain on the microstructures,...
Different types of silver nanostructures are synthesized via a solvothermal method by reducing silver nitrate with ethylene glycol using poly(vinylpyrrolidone) as an adsorbing agent and adding or without adding sodium chloride to the solution. Scanning electron microscopy and X-ray diffraction spectra have been used to investigate the products. These nanostructures were evaluated as good surface-enhanced...
Ca(Mg1/3Nb2/3)O3/CaTiO3 (CMN/CT) heterostructure dielectric thin films, with the same thickness but different arrangement patterns, were prepared by Pechini method. The effects of the heterogeneous interface on the structure and properties have been studied. The results showed that, in non-alternating arrangement films, single perovskite phase can only be obtained in TM heterostructure film, in which...
This paper presents localized cell lysis using a self focused acoustic transducer (SFAT). The 18 MHz acoustic waves generated by the SFAT focus at a spot of around 100 mum in diameter with a peak intensity of 25 W/cm2, which is strong enough to produce acoustic cavitation at such high frequency. With the great pressure and temperature produced by the cavitation, cells are broken and detached in a...
This paper described ultraviolet (UV) radiation sensing using ZnO based Film Bulk Acoustic-wave Resonator (FBAR). The resonant frequency upshifted when there was UV illumination on the FBAR. For 365 nm UV light, the frequency upshift was 9.8 kHz with an intensity of 600 muW/cm2, and the detection limit of the sensor was 6.5 nW. The frequency increase of the FBAR UV sensor was proposed to be due to...
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