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220 kV cross linked polyethylene (XLPE) cables laid in tunnel had a wide utilization urbanely, and the cables, linked by cable joints with cross-bonding connection, are also convenient for maintenance and installation. However, there were a few short-circuit faults happening in recent years due to the damages on the 220 kV cables or their joints which were probably caused by switching the no-loaded...
A power transmission line with a 500 kV AC cross linked polyethylene (XLPE) submarine cable combined with the overhead lines will be built at Zhoushan of China in 2018. The calculation of various transient voltages on the insulation and insulating sheath of the submarine cables is one of important subjects. This paper aims to clarify the characteristics of transient voltages under various fault conditions...
Colonoscopy is widely used in the diagnosis and treatment of colorectal diseases due to its minimal invasiveness, convenience and efficiency. However, it has two problems: bowel perforation and looping. In order to overcome these problems, it is necessary to get the information of the force and posture of the distal end of the colonoscope in the colonoscopy procedure. Elsewhere, we have reported an...
We investigate the problem of person search in the wild in this work. Instead of comparing the query against all candidate regions generated in a query-blind manner, we propose to recursively shrink the search area from the whole image till achieving precise localization of the target person, by fully exploiting information from the query and contextual cues in every recursive search step. We develop...
A novel broadband circularly-polarized (CP) antenna fed by strip-line is proposed. The CP operation is achieved by corners truncated and can be significantly improved by introducing a pair of half loop strips around two opposite corners of the square patch. The bandwidths for the axial ratio (AR < 3 dB) and relative impedance (|S11| < −10 dB) is 7.6% (16–17.2 GHz). The proposed antenna also...
Elastic properties of the ocular tissues are significantly affected by intraocular pressure (IOP) in the eye. For example, the speed of the elastic wave in the cornea dramatically increases with IOP. In our previous studies using ultrasound shear wave imaging we demonstrated that, for the lens, the increase in IOP does not result significant changes in the wave velocity. Compared with ultrasound imaging,...
After years of rapid development, wind energy has become one of the three major energy sources in China. Due to the rapid development of wind power industry, wind energy has become one of the most important energy sources in the world, the demand for wind turbines is also growing. Therefore, investigations of the wind turbines are particularly important. Dual-stator brushless doubly-fed generator...
High spectrum efficiency and flexibility are the advantages of elastic optical network, which is the future direction of optical network development. Routing and resource allocation is one of the core technologies of flexible optical networks. This paper propose an improved RSA algorithm in the elastic optical network which based on OSNR impairment model. It considers both QoT (quality of transmission)...
Big Knowledge repositories, in the form of large ontologies, typically consist of many thousands of knowledge assertions. They have complex network structures consisting of nodes and links. Without some form of comprehension, humans cannot make correct, innovative and creative use of Big Knowledge. Visualization is an important tool for knowledge comprehension, however, the node-link diagrams become...
Robust and efficient tracking of continuum robots is important for improving patient safety during space-confined minimally invasive surgery, however, it has been a particularly challenging task for researchers. In this paper, we present a novel tracking scheme by fusing fiber Bragg grating (FBG) shape sensing and stereo vision to estimate the position of continuum robots. Previous visual tracking...
Recently, with the fast developments of metamaterials, uniformly tuning techniques for metamaterials and periodic structures over large scales attract lots of attentions. In this research, we proposed a linkage mechanism for mechanically tuning the frequency responses of planar periodic structures where all the unit cells are connected with links. By actuating the two driving links, each unit cell...
In the past decades, frequency selective surfaces (FSSs) have been widely used for providing desired frequency responses in microwave and optical frequencies. Various tuning techniques have been investigated to switch or continuously tune the frequency responses based on the needs in certain circumstances. However, it's still challenging to alter each unit of the FSS synchronously which results in...
The success of Convolutional Neural Network (CNN) is attributed to their ability to learn rich midlevel image representations as opposed to hand-crafted low-level features used in many natural image classification methods. Learning CNN, however, amounts to estimating millions of parameters and requires a very large number of annotated image samples. In this paper, we explored transfer learning for...
While cloud services are becoming more and more widely used, their security issues are noticed by researchers. Multimedia data, especially images, which usually contain a lot of private information, sometimes are carelessly handled by users and the cloud servers as well. There for, it is necessary to protect those outsourced image data. Although data encryption is useful for storage purposes, data...
Many challenges of modeling and control exist in the tail-sitter aircraft, including parameter uncertainty, highly coupling, nonlinearity, and external disturbance. In this paper, the model of a tail-sitter aircraft is simplified at the nominal condition to obtain the nominal linear invariant model. Then a robust controller based on the H∞ control theory is proposed to deal with the attitude tracking...
The Geostationary Interferometric Microwave Sounder (GIMS) is millimeter wave imaging sounder concept proposed for China's next generation geostationary meteorological satellite (FY-4M). GIMS is supposed to utilize a rotating circular thinned array, instead of a stationary Y-shape array, to reduce the required number of the antenna elements. A proof-of-concept 53GHz ground-based GIMS demonstrator...
In this paper, we present the experimental results of a DBF (digital beam forming) scatterometer demonstrator performance on the purpose of development and verification of innovative DBF concepts and advanced operational modes for the future space borne MICAP (microwave imager combined active and passive), China's ocean salinity mission. The hardware configuration of the demonstrator is introduced...
The aim of the paper is to describe a ground-based microwave scatterometer demonstrator dedicated for the functional verification of MICAP (Microwave Imager Combined Active and Passive). MICAP has been selected to be one of the main payloads for future Chinese ocean salinity mission. The MICAP scatterometer is for estimating ocean surface roughness which measurement will enable the removal of the...
This paper presents the design and preliminary performance tests of an L-band synthetic aperture interferometic radiometer using the new sampling concept of clock scan. With the advantages of simple and deployable array structure, the concept of Clock Scanning Microwave Interferometric Radiometer (CS-MIR) has much potential to apply for the future Solar Polar Orbit (SPO) and Geostationary Earth Orbit...
In the synthetic aperture radiometer system, the imperfection of the antenna pattern and the inconsistency between the elements can cause systematic spatial error on the retrieved image. Antenna pattern error analysis and calibration methods of an L-band 1-D synthetic aperture radiometer are presented in this paper. An improved calibration algorithm proposed here uses approximate observation target...
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