The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
for improving the present situation in the quality detection of plate making product line, a simplified homocentric square filter (SHSF) is proposed and implemented based on machine vision. Firstly, a hardware platform including camera, lens, light source, and encoder is designed to acquire high quality images. In order to automatically detect defects from the acquired images, the SHSF is designed...
The computer-aided diagnostic (CAD) system can greatly influence the early detection of lung cancer in radiographs and computed tomography (CT) images. And the automatic nodule detection plays an important role in the CAD systems. This paper proposed a new enhancement filter (3D multi-scale Block LBP Filter) to detect the nodules in the lung regions. By taking advantages of the nodule regions' pixel...
In order to obtain the influence of metallic particles on the insulating performance of vegetable insulating oil, copper particles were chosen to contaminate the vegetable insulating oil. The AC breakdown voltage of rapeseed insulating oil with different copper particle concentrations was measured. The dielectric properties i.e. relative permittivity, dielectric loss tangent and volume resistivity...
The dielectric properties of transformer oil are greatly threatened by particles especially the metallic particles. In order to obtain the influence of metallic particles on frequency domain spectroscopy (FDS) of mineral oil, we chose copper particles to contaminate the mineral oil artificially. The dielectric properties such as relative permittivity, dielectric loss tangent and volume resistivity...
As the important part of the transformer insulating, the insulation performance of oil-paper directly affects the security and stable operation of the transformer. In order to study the influence of temperature and thermal aging on the breakdown voltage of oil-paper insulation, breakdown voltage test of transformer's oil-paper was carried out, and breakdown voltages of oil-paper insulation were obtained...
Ice accumulation on transmission lines, caused by freezing rain, wet snow or frost, is one of major problems influencing safety of electric power system. Super hydrophobic coating on insulators is a kind of efficient way to solve the problem. Many kinds of super hydrophobic coatings are widely used in power system, especially fluororesin based coating which is cheap and has good outdoor weathering...
The thermal aging is one of the main factors leading to degradation of oil-paper insulation. Carbon oxides dissolved in insulation oil mainly come from cellulose pyrolysis, which indicates that the carbon oxides in oil can be used to predict the thermal aging degree of oil-paper insulation in power transformer. In this paper, accelerated thermal aging test for oilpaper samples composed of conventional...
The oil-paper insulation in converter transformers is subjected to pulsating DC voltage, mainly consisting of AC and DC voltages. Surface partial discharges (PDs) occurred in converter transformer is significantly influenced by voltage type as well as moisture content in oil-impregnated paper insulation. The influence of moisture content on surface PD behaviors of oil-impregnated paper insulation...
In terms of the retail commodity sale forecast, people did more in particular aspect with commodity's single sale attribute such as the sale volume, the sale money, the season factor, but all has not considered the most important factor-profit, the profit is the key factor of retail enterprises winning the survival and development. However, such a one-sided analysis is not conducive to assist the...
A cloud platform prototype for Computer Aided Engineering (CAE) simulation is developed for the large-scale parallel CAE simulation application. We propose the architecture of the platform. In the architecture, we propose a technology called CAE Application Packaging Template (CAE-APT) for integrating heterogeneous CAE softwares based on "Tianhe No.1". We discuss the design ideas and the...
The oil impregnated paper is one of the typical composite structure containing a large number of cavities, which are filled with insulating oil through oil impregnation. In this paper, the oil-impregnated paper structure is simplified and an electrical breakdown model is developed to describe the breakdown progress in oil impregnated paper at pulsating DC voltage. Based on the traditional WZ model,...
Cloud Map-Reduce (CMR) is an advantage Map-Reduce platform and has been aroused more and more attention. To further balance the performance of job secluding among job cost, execution time and energy consumption, a locality-aware and energy-aware job pre-assignment algorithm is proposed for Map-Reduce of CMR in this paper. Firstly, the importance of rack in data locality and energy saving is analyzed...
Infrared videos from transmission line inspection of UAV have a large amount of data with low SNR (Signal to Noise Ratio). Identifying heat defects automatically using infrared videos is difficult and inefficient. In this paper, an advanced method is proposed. Firstly, points with excessive value of the component regions according to conductors are analyzed in their neighbors to obtain defect points...
We experimentally demonstrate a 36-Gb/s DMT signal transmission over 50-km SSMF based on a cost-effective 10-GHz DML-based IM/DD system. The data rate is improved by 22% with Volterra filtering.
Optical-Enabled cloud radio access network (CRAN) divides legacy base station into remote radio heads (RRH) and centralized baseband units (BBU) pools. In this paper, we focus on the improvement of BBU resource utilization, and propose a BBU aggregation by dynamically awaking and sleeping BBU cards under time-geometry pattern. We discuss the BBU capacity model, and two heuristic algorithms are developed...
Testing and modeling of batteries are essential to evaluate the performance and effectiveness of battery energy storage systems (BESS) in power system applications. The procedure of extraction and experimental verification of any battery model require a reliable and efficient testing system. In this paper, a programmable grid-interfaced battery test system for battery modeling in a frequency-controlled...
The valve side Wingdings of converter transformers withstand complex electric stress, and the minor insulation of converter transformers withstand combined fundamental AC and harmonic voltages. Surface partial discharge is a main form of discharge occurring in minor insulation and there is a severe lack of empirical research on surface partial discharge in oil-impregnated insulation paper at harmonic...
Dense heterogeneous cellular networks (HCNs) with energy harvesting nodes are promising solutions to meet both the capacity and energy efficiency needs in the next generation cellular networks. This paper studies the system performance of both energy harvesting and information receiving in a K-tier cellular networks with time-switching simultaneous wireless information and power transfer (SWIPT)....
Paper insulation in transformers degrades due to the effect of thermal, electrical, mechanical and chemical stress and monitoring of the insulating paper aging thus becomes important to the safe operation of transformers. In this paper accelerated thermal aging experiments were conducted at 130 centigrade degrees for insulation paper with insulating oil. The cellulose fibers in insulating oil of each...
The study of Web user profiling can be traced back to 30 years ago, with the goal of extracting “semantic”-based user profile attributes from the unstructured Web. Despite slight differences, the general method is to first identify relevant pages of a specific user and then use machine learning models (e.g., CRFs) to extract the profile attributes from the page. However, with the rapid growth of the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.