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.
Because traditional direct torque control (DTC) has unfixed switching frequency and ripple of torque and flux, deadbeat direct torque and flux control (DB-DTFC) of interior permanent magnet synchronous motor (IPMSM) is studied. At first, DB-DTFC based on IPMSM mathematical model is deduced. The calculated proper voltage vector can make reference torque and stator flux during one sampling period. But,...
A Sliding Mode Controller of Permanent Magnet Synchronous Motor (PMSM) is analyzed and designed in this paper. Because of non-linearity, strong couple and disturb sensitivity of PMSM, it is difficult for linear control technology to get perfect control performance of PMSM. Sliding Mode Control (SMC) is an efficient robust control method, which can self-adjust controller structure online, and is non-sensitive...
To investigate the effect of 103 Pd radioactive stent on Caspase-9, cholangiocarcinoma cell growth and its radiosensitivity.Cholangiocarcinoma was treated with 103 Pd radioactive stent at different period. Radiosensitivity of the cells was detected by methyl thiazolyl tetrazolium (MTT) method. Apoptosis of cholangiocarcinoma cells was detected by immunohistochemistry and electron microscope...
The dense signal identification requires resolving leakage-error and the cross-interference produced by the different frequency signals at the same time. Inner product and iteration calculation are combined to identify the dense signal. The max of amplitude of inner product is searched to estimate the parameters of a signal initially; then the estimated signal is subtracted from the total signal and...
Micro-perforated panel absorber(MPA) with linear-change cavity can increase the frequency bandwidth of sound absorption, but its theoretical computation results are not in good accordance with the experiment results. A MPA with linear-change cavity is divided equivalently into several absorbers with equal width. After the simplification of the model, the absorptivity of each equivalent absorber is...
The boundary loose of cantilever beam is one of the factors that affect the structural safety. By ADAMS calculation and experiment, it is proved that the nature frequency of cantilever beam will change subtly when the constraint force on the boundary of a cantilever beam is changed. The Discrete Fourier Transform (DFT) method adopts prior base strategy. The frequency interval and leakage error exist...
The solar-air dual-source heat pump technology is based on the application of solar energy and air energy as the heat source of the heat pump system. It is a comprehensive utilization of the solar energy and the air energy, and it can be a good solution to the low efficiency, the non-stability and the poor reliability of the air-source heat pump in winter. In the paper, the development of different...
Making self-estimation in network teaching is not only an important stage for students, but also an important method for checking the learning quality. This article states the aim and content of self-estimation in network teaching,and it takes a network curriculum in Virtual Learning Community of Capital Normal University as an example to discuss its effect on learning quality, taking four aspects...
E-learning is a modern learning manner that fitting the learning features in information society. It carries out education and provides service in virtue of Internet, and it also broadens out the confine and concepts of study, transcending the meaning and extension of traditional training. This article analyzes the background of times which e-learning was produced, states its basic implication and...
The ground source heat pump is regarded as an advanced technology of high efficiency, energy conservation, and environmental protection, favorable for durative development. It is also regarded as the best efficient air conditioning technology providing both heating and cooling in the 21th century. However, the environment has been affected in great degree for the wide application of the ground source...
With the development of e-learning, it is important to make e-learning evaluation scientifically and objectively. And now there are so few methods for e-learning evaluation. This paper proposes a method based on fuzzy comprehensive evaluation system of e-learning, and design a evaluation system and solution in order to provide more valuable reference for education decision makers.
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.