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.
Collecting labeling information of time-to-event analysis is naturally very time consuming, i.e., one has to wait for the occurrence of the event of interest, which may not always be observed for every instance. By taking advantage of censored instances, survival analysis methods internally consider more samples than standard regression methods, which partially alleviates this data insufficiency problem...
Insurance plays a key role in the financial industry, and it is also of great importance for people's socio-economic life. Therefore, in this paper, we demonstrate on the problem of analyzing the operating performance of insurance companies, and it is crucial for modern financial industry development. Firstly, we design an index system for evaluating operating performance of insurance companies, which...
The planned Indonesia Banten power plant project is programmed with total installed capacity of 2x670MW, its cooling water discharge is 59.6m3/s. Approximately 0.8km southwest of this project, there is another power plant named Suralaya has been built. Two power plants both adopted once-through seawater cooling system that taking cooling water from the Java Sea directly. When two power plants running...
High-speed coherent anti-Stokes Raman spectroscopy with two linearly chirped frequency combs is demonstrated. Multiplex Raman spectra covering most of the fingerprint region are acquired with high resolution on nanosecond measurement time scale.
We demonstrated an all-silica beam information detector based on Pancharatnam-Berry phase which can effectively detect the signal while the original wavefronts are strictly protected. A chiroptical spectrometer and a 12-channel angular momentum detector were proposed.
Real-time absolute group refractive index of air at 1545 nm is measured using frequency comb calibrated frequency-sweeping interferometry by recording the calibration peaks and interference signal simultaneously. For ambient air, a combined uncertainty of 8.6×10−8 is achieved.
We propose and demonstrate a fiber supercontinuum source for broadband coherent anti-Stokes Raman scattering microscopy, seeded by an all-normal-dispersion mode-locked laser. We achieve 700–1900 cm−1 spectral range, and show its application in analyzing complex mixture.
A novel fractional-order Kinetic Battery Model (KiBaM) is proposed to accurately describe the battery nonlinear characteristic of the available capacity under discharge. Firstly, the influence of different discharge current on battery available and unavailable capacity is analyzed. Then, with the theory of fractional calculus, a novel KiBaM model model equation is proposed to characterize the battery...
Traditional Hysteresis current control (T-HCC) method has a good transient response performance and robustness. However, when applied in the three-phase voltage source converters (VSCs) occasions, due to the interphases dependency and coupling among the three-phase currents, current harmonics and high switching frequency will arise. Considering of this, this paper presents a new sine-like HCC (SL-HCC)...
For the excellent electrical performance, Gallium Nitride (GaN) new-type semiconductor devices are preferred in high voltage, high frequency and high power applications. However, GaN devices have low on-resistance and the loop layout requires low damping in high frequency loop. These both can lead to voltage and current oscillations under high frequency and even cause uncontrollable oscillations,...
With the rapid incensement of personal vehicles, urban traffics congestion is now a prominent problem in many major cities in China. Electronic Toll Collection (ETC) is an efficient solution for traffic jaw problem. This paper introduces an embedded system designed for Dedicated Short Range Communications (DSRC) standard based ETC system of China. In this system, a STM8L151G micro controller was used...
Direct method for visual odometry has gained popularity, it needs not to compute feature descriptor and uses the actual values of camera sensors directly. Hence, it is very fast. However, its accuracy and consistency are not satisfactory. Based on these considerations, we propose a tightly-coupled, optimization-based method to fuse inertial measurement unit (IMU) and visual measurement, in which uses...
Since the traditional half-bridge modular multilevel converter (HB-MMC) is endangered under DC side short-circuit faults. This paper proposes a novel sub-module (SM) topology for MMC with DC fault limitation capability. The fault current is fully transferred to the bypass thyristor by turning off all IGBTs when DC short-circuit fault occurs, then the diode freewheeling effect is eliminated and all...
Due to the high switching speed of SiC MOSFET, the parasitic parameters and the low damping in the circuit, the turn-off overvoltage and oscillation of the freewheeling diode and SiC MOSFET are very severe. Based on the terminal impedances during the turn-off transition of the freewheeling diode and SiC MOSFET, the mechanism of the turn-off overvoltage and oscillation are analyzed and the suppressing...
Bipolar DC system provides flexible connection and decreased line-to-ground voltage level at the expense of potential voltage unbalance between positive pole and negative pole. Voltage balancer works as “Dependent Voltage Source” to eliminate the unbalance voltage. It is a critical grid-forming component for bipolar system. Considering the need of system expansion and “N+1” redundancy design, bipolar...
The exponentially increasing number of Internet of things (IoT) devices introduces spectrum crisis to the widely used industrial, scientific, and medical (ISM) frequency band. Since IoT devices use heterogeneous radios with different bandwidths (e.g., 20 MHz for WiFi and 2 MHz for ZigBee), traditional interference avoidance methods, such as time-division multiple access (TDMA) and carrier-sense multiple...
With the advancement of VSC-HVDC technology, large-scale renewable energy that has no synchronization support could achieve long distance transmission and grid integration through VSC-HVDC connection. However, the VSC-HVDC transmission system consists of a large number of power electronic components. After faulted lines are cut off due to precedent faults, other transmission lines or HVDC converter...
The problem of the wind turbine gearbox fault diagnosis was investigated by employing the support vector machine (SVM), which is optimized by the improved fruit fly intelligent algorithm with decreasing steps. First of all, the fault characteristic value extracted by Hilbert transform envelope is presented. Secondly, the general SVM solution to the wind turbine gearbox fault diagnosis problem is presented,...
In order to analyze interaction between wind farm and electric power system, research transient voltage characteristics of large-scale wind farm in system fault and after fault, and realize large-scale wind farm fault ride through, it is necessary to build wind turbine modeling suitable for large electric power system simulating calculation program. Various power system simulators are used in many...
The model identification of power battery has always been the key and difficult point in the battery management systems(BMS). In this paper, the theory and method of fractional calculus are introduced in the strategy of modeling the equivalent circuit of power battery, which can break through the limitation of integer order model. Based on the fractional algorithm, the time constant of the circuit...
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.