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.
Vacuum interrupter(VI) with axial magnetic electrode has superior arcing performance and well-distributed of contact erosion. Two kinds of axial magnetic electrode were assigned in this paper, which included cup shaped and horseshoe axial magnetic electrode. The objective of this paper is to research the current breaking and carrying performance of VI with cup shaped and horseshoe axial magnetic electrode,...
Shen-Wei coal pipeline is the first constructed coal pipeline in China. Since Shen-Wei coal pipeline goes through loess plateau area where exists broken grounds, gullies spreading all over the area, and secondary disasters and so on, it is difficult to construct the pipeline. With the aid of the directional drilling technique existed in oil and gas pipeline, this problem is successfully solved in...
An electrical method for characterizing optical filters is proposed and demonstrated based on low-frequency detection, which enables magnitude frequency response measurement with hyperfine resolution up to 50 kHz and doubled measuring frequency range in the electrical domain.
The objective of this paper is to determine optimal contact parameters of a 126 kV horseshoe type axial magnetic field (AMF) vacuum interrupter. By a combination of three design methods, including design of experiment (DOE) method, finite elements method and statistical analysis method, the optimal AMF characteristics of the contacts were determined by single factor analysis and orthogonal regression...
Gain fluctuation in a microwave photonic phase shifter based on Brillouin slow and fast light is theoretically and experimentally analyzed. The results show that, in order to reduce the gain fluctuation, it is necessary to increase the vestige sideband suppression ratio of the single-sideband modulation. Additionally, the input power of the optical single-sideband modulation signal should be set at...
A novel broadband linearization scheme for time-stretch analog-to-digital converters employing an asymmetrical dual-parallel Mach-Zehnder modulator and a balanced detector is presented. The theoretical and simulation results show that the proposed scheme can effectively suppress the even-order distortions and the third-order spurs even under a large modulation depth. The carrier to third-order intermodulation...
This paper presents a novel scheme towards license plate segmentation. Due to various illumination conditions, an adaptive local binary method is performed to acquire binary images. Then likeliest character region (LCR) is detected based on canny edge images which are acquired from preliminarily processed license plates. All binary images are transformed into a standard positive image without recognizing...
Intelligent Transportation Systems (ITS) is becoming more and more popular in daily life. The License Plate Recognition (LPR) is an important part of the ITS, and it is also a basic part in traffic management. Generally speaking, the LPR system consists of three parts: license plate location, license plate character segmentation and character recognition. In this paper, a license plate character segmentation...
Shadows exist in images where three-dimensional objects are irradiated by strong directional lights. Shadows will significantly influence the effects of image processing, such as object detection and image segmentation. Shadow removal has been an important subject as one kind of preliminary processing methods and varies algorithms have emerged. In this paper, we present an algorithm of shadow removal...
The nonlinear dynamics of semiconductor optical amplifiers (SOAs) are investigated. We focus on the nonlinear gain, phase and chirp dynamics that can be used for high speed all-optical switching. Ultrafast component in the phase dynamics is observed. We explain this phenomenon by using a numerical model that includes the impact of sub-picosecond intra-band effects in the SOA. In addition, we also...
In this paper, we experimentally demonstrated an optical generation of microwave carrier using optically injection-locked Fabry-Perot laser diodes in tandem through a phase modulator. It is verified that the proposed scheme is able to achieve an optical carrier suppressed (OCS) signal with a good suppression ratio simultaneously through a programmable optical filter and by use of optical injection...
We demonstrated a novel self-clocking based on in-band phase-modulated pilot insertion and extraction for ultra-high speed optical time-division multiplexing (OTDM) signals. The clock recovery function is realized by inserting at the transmitter and extracting at the receiver an in-band phase-modulated pilot that is located in the data spectrum, which eliminates the need for an ultra-fast phase comparator...
Accident of asphyxiation and explosion is likely to be induced by the instantaneous leakage of natural gas (NG) highly containing carbon dioxide. It is necessary to study the distribution of emergency region so as to make good emergency response. Distribution of emergency region was simulated using method of computational fluid dynamics. Research suggested that NG highly containing carbon dioxide...
A great amount of sodium hydrate alumino-silicate generated from alumina production not only threatens the environment but also causes waste of secondary resources. High-alumina-content sodium hydrate alumino-silicate was employed to recover alumina by the process of hydrometallurgical route at low temperature and normal atmosphere. The X-ray diffraction pattern shows sodium hydrate alumino-silicate...
Accident of asphyxiation and explosion is likely to be induced by the instantaneous leakage of natural gas highly containing carbon dioxide. Computational fluid dynamics (CFD) method is one of the best ways to study such kind of dispersion issue; however, it is necessary to prove the reliability based on physical essence. This paper built numerical model for puff dispersion of natural gas highly containing...
A reliable transmission scheme for security and protection system (SPS) based on internet of things is proposed. A cooperative transmission mechanism is designed to improve the reliability and efficiency of data services. Meanwhile, rate selection algorithm based on channel conditions is elaborated. An analytical model is introduced to evaluate performance of our proposed cooperative broadcast scheme...
The design of RS (255,239) encoder based on ADSL system GF (2 8) is studied, the core encoder multiplier unit and limited domain constant realization of hardware are presented in the paper. Because the coding process adopts 16 dedicated constant multiplier units, with variable comparison multiplier unit using before, which greatly simplified the hardware structure of multiplier unit, saved the hardware...
This chapter contains sections titled:
Human Umbilical Vein Endothelial Cells
Role of Angiogenesis in the Pathophysiology of Disease
HMG–CoA Reductase Inhibitors have Therapeutic Effects that are Both Dependent and Independent of Cholesterol Lowering
Studies of the Effects of Statins on Angiogenesis Using Both In Vivo Models and In Vitro HUVEC and HDMEC Models for Angiogenesis
References
In the course of constructing service government, service concept should be formed and service quality should be improved. On the basis of customer satisfaction theory, this paper researches on enterprises' satisfaction to the economy and trade board in Yiliang County by developing a questionnaire. At the first, this paper reviews literature about customer satisfaction. Secondly, it designs index...
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.