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.
To reduce the negative effects caused by electric vehicles (EVs), this paper proposes a coordinated charging strategy for batteries in EV charging station. According to the charging characteristics of EV batteries, the strategy is established to minimize the sum of squares of the substation, which could consider the number of battery chargers, EVs' needs for batteries, power limit of EV charging and...
The wind power prediction (WPP) is challenging as a large amount of data with complex nonlinear relationship should be fitted by the prediction method. To improve the accuracy, WPP based on the Multilayer Restricted Boltzmann Machine (MRBM), which is a deep learning neural network with strong feature interpretation ability, is presented in the paper. To explore the influencing factors of prediction...
A reflective sandwiched polarizing beam splitter (PBS) grating with a connecting layer in Littrow mounting is described and designed in this paper. By using two-beam-interference theory for a modal method, a duty cycle and a period of grating can be calculated, where the first order is well suppressed for transverse magnetic (TM) polarization. In addition, the grating groove depth can be roughly evaluated,...
A wideband Yagi antenna used for THz integrated application has been successfully developed. The antenna is constructed by some air-gap Coplanar Waveguides (CPW) with different length. The air-gap CPWs are realized by the air bridge technology. A semiinsulating SiC substrate with thickness of 50um is used as the supporter of antenna. Due to the use of the air-gap CPW, the affection of substrate can...
In Human Body Communication (HBC) system, low power is still one of the most important research issues for monitoring nodes supplied by battery. Utilizing two-hop extension star network topology is an efficient measure to reduce the average transmission power consumption and improve the stability. This paper proposes a digital baseband system for low duty cycle and low load network. When the nodes...
This paper presents a digital dimming control circuit used in a light-emitting diode (LED) driver, allowing it to dim multiple LED strings with only two input ports which receive serial data accompanied with synchronous clock. A multiplexing technique is used to simplify the control circuit, using one DAC to transfer all the dimming messages for each string, and a real-time refresh technique is used...
Cells can be regarded as a complex network, which contains thousands of criss-cross signal pathways. The mechanical properties of a cell reflect the structure and composition of its cytoskeleton and are closely related to the cellular biological functions and physiological activities. In this study, we develop a dynamical model with cellular viscoelasticity properties as the system parameters to describe...
Difficult-to-machine materials is widely used in aerospace. Titanium alloy (Ti-6Al-4V) by using computer numerical control (CNC) machining is studied in order to improve the processing efficiency of Ti-6Al-4V. The wear amount of cutting tool as a key part of CNC is one of the most important representation for the machining efficiency and the stability for cutting difficult-to machine materials. An...
In this paper, we present an auto-calibrated process insensitive relaxation oscillator. A process sensitivity of 1.36% is achieved by automatically sensing the output clock frequency spread and alternatively adjusting the capacitor-used for charging and discharging. In addition, a time to digital converter is adopted for tuning the compensating capacitor. Moreover, the proposed oscillator with on-chip...
This paper presents the design method using topology optimization and the fabricating feasibility using Fused Deposition Modeling (FDM) 3D printing technique for Functionally Graded Material (FGM) insulator. The concepts of FGM and topology optimization are primarily introduced. And a topology optimization approach based on COMSOL Multiphisics is proposed. The optimization objective is to uniform...
Ultra-high-frequency (UHF) method has been applied to detect and localize partial discharge (PD) in air-insulated substation (AIS). The localization accuracy is closely dependent on the configuration of antenna array. This paper presents a PD localization error simulation method. Assuming that the estimated time difference of arrival (TDOA) error is normally distributed, the mean value and standard...
The photovoltaic (PV) module temperature (Tm) and ambient temperature (Ta) are both important factors to PV power output (P), but are often confused with each other or even ignored. In this paper, the physical analysis methods and mathematical analysis methods are utilized to research the differences and similarities of two temperatures in effecting of PV power output. Firstly, based on PV effect...
This paper studies the consensus problem of discrete-time multi-agent systems with relative-state-dependent (RSD) measurement noises. Firstly, consensus is analyzed for noise-free systems under the switching topologies. Then, under a martingale-difference assumption on the noises, it is proved that, by giving a small distributed control gain, the mean square (m.s.) and almost sure (a.s.) consensus...
The maximum power point tracking strategy usually prevents doubly fed wind power generator(DFIG) from controlling its output power and providing spinning reserves. According to the operating characteristics of DFIG, this paper proposes a novel power control strategy based on coordinating over-speed control and pitch control. The coordination strategy can effectively control the output power of DFIG...
With the large-scale development of wind power in heating district of North China, the wind curtailment problem is getting more and more serious due to the insufficient peaking capacity of a high proportion of heating plants, the wind power “anti-peaking” characteristic and the limited delivery absorptive capacity of grid and other factors. In this study, controllable “electrical heating with thermal...
Since the demand response play a more and more important role in smart grid, a security constrained unit commitment model considering the interactive impacts of price based demand response is proposed. First, the price based demand response is integrated with the basic security constrained unit commitment (SCUC) model, then the interactive impacts are considered. In the user side, the comprehensive...
For dielectric-vacuum compound insulation systems, the discharges usually occur across the insulator surface with an onset voltage much lower than the breakdown voltage for vacuum gap of the same length, which is the main cause leading to insulation failure. It has always been a hot topic to improve the surface insulation strength in vacuum. In this paper, the relationship between the flashover time...
Incidents of public security have an ascendant trend in recent years all over the world, and it is more important to understand the correlation of different kinds of public security incidents. With the popularization of the Internet, numerous web messages can provide resources to do that. However, an important challenge is that the web messages are often heterogeneous and unstructured. In this paper,...
The effect of group-velocity dispersion (GVD) and self-phase modulation (SPM) on the coherent pulse progression in mid-infrared quantum-cascade lasers (QCLs) is investigated. The background saturable absorber (SA) effect is included in this paper. In this case, the lasing pulses can be built up from the instable continuous wave operation condition related to both SA effect and GVD under the influence...
Incidents of public security have an ascendant trend in recent years all over the world, and it is more important to understand the correlation of different kinds of public security incidents. With the popularization of the Internet, numerous web messages can provide resources to do that. However, an important challenge is that the web messages are often heterogeneous and unstructured. In this paper,...
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.