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.
Financial time series prediction is remains a challenge, due to the nonstationary and fuzziness financial data. In this paper, we propose and achieve a hybrid financial time series model by combining the Maximum Entropy (ME), Support Vector Regression (SVR) and Trend model based on Artificial neural networks (ANNs) for forecasting financial time series. The method contains three steps. The first step...
Background Viral myocarditis, which is often caused by coxsackievirus B3 (CVB3), is a serious clinical disorder characterized by excessive myocardial inflammation. Valproic acid (VPA) is described as a histone deacetylase inhibitor that has anti-inflammatory effects in several inflammatory diseases. However, the role and the detailed mechanism of VPA in viral myocarditis remain unclear. Methods...
Based on the digital sampling technology, a new broadband phase difference calibration device is developed. The DFT and interpolation compensation algorithms under non-integer period sampling are used. The construction, sampling strategy and compensation algorithm of the calibration device are introduced in detail. Its uncertainty is evaluated and verified by experiments. The frequency of the device...
Voltage fluctuation and flicker is an important aspect of power quality. The key of flicker analysis is to track the envelope of voltage signals and then calculate the short-term flicker severity. In this paper, a new method on calibration of flickermeters was presented. The method did not adopt the phase-locked loop between the flicker waveform generator and the DVM. It tracked the envelope by interpolated...
For high-frequency resistive voltage divider, the distributed parameter model was studied and the key factors affecting its performance were discussed. The high-frequency characteristics of typical outer structure of voltage divider were simulated by ANSYS software. According to the reflection coefficient, VSWR and return loss, an optimized structure of divider for high frequency is presented.
The paper introduces a calibration system on wideband power. The system is based on the synchronous sampling technology and non-integer-period interpolation compensation algorithm. Its frequency ranges from 10Hz to 100kHz, and the optimum measurement uncertainty is 25µW/VA.
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.