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.
Computing with memory, which stores function responses of some input patterns into lookup tables offline and retrieves their values when encountering similar patterns (instead of performing online calculation), is a promising energy-efficient computing technique. No doubt to say, with a given lookup table size, the efficiency of this technique depends on which function responses are stored and how...
In recent years, people pay more and more attention to the knowledge of health care and longevity. As an important branch of the Traditional Chinese Medicine (TCM), health preservation is a subject for studying the theories and methods to prevent diseases and to maintain personal health. We aim to provide the general public as well as the TCM practitioners and students with a convenient way to access...
In this paper, an ultra-thin polarization-independent wideband metamaterial absorber (MA) is proposed. The unit cell of this MA is composed by a branch-like pattern with four patch-resistors, FR4 substrate and metallic plate, which can delicately combine dielectric loss and ohmic loss. The electromagnetic performances of the MA are studied by full-wave simulations based on finite-element method. The...
We propose a scheme to realize polarization rotation (PR) based on SOI by using two mode converters and a phase shifter. Simulation results from 3D-FDTD show that the PR has extinction ratio (ER) larger than 20 dB and insertion loss less than 0.4 dB in an ultra-wide range from 1450 nm to 1650 nm for both TM0 and TE0. Moreover, the total length of the device is 33μm with a height of 220 nm.
The influence of forward current freewheeling time on the reverse recovery di/dt robustness of Superjunction (SJ) MOSFET body diode is investigated in detail. It is found that the maximum di/dt capability of body diode is improved dramatically with reducing the forward current freewheeling time. To explore this phenomenon, physical TCAD simulations and experiments have been carried out. It shows that...
The performances of 4H-SiC power Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) with defects induced by cosmic radiations are studied in this paper. By SRIM and SILVACO T-CAD simulations, the radiation effects on the electrical parameters of the device are observed. The results indicate that the radiations from different directions induce defects in different regions of the device. The...
This article points out the challenges shipping companies face in big data era, collects the concepts of Shipping Big Data, illustrates the existing problems in cognition and application of big data in shipping companies, puts forward the corresponding research directions and enterprise application prospects in future.
This article clarifies the logistics enterprise's trade credit risk, demonstrates and comments a typical practice case in China. A dynamic trade credit management system model combining outsourced credit monitor and self-adaptive assessment is proposed. Special attention is given to the application prospects of big data in related researches and practices in future.
We propose a novel structure to realize highly efficient polarization beam splitter (PBS) by using a slot waveguide. Simulation results show that the PBS has realizes extinction ratio larger than 24.6 dB from 1500 nm to 1600 nm for TM and larger than 20 dB from 1521 nm to 1584 nm for TE. The maximum of ER for TE is as high as 37.4 dB at 1552 nm. The insertion loss for TE and TM are under 0.06 dB and...
PM2.5 (particulate matter in the atmosphere with a diameter no more than 2.5 microns) in the air can cause great damage to human beings. It's a great challenge to offer a fine-grained and accurate PM2.5 monitoring service in urban areas as the required facilities are very expensive and huge. Since the PM2.5 has a significant scattering effect on visible light, the large-scale user-contributed image...
Brain-Machine Interface (BMI) has emerged as a powerful tool for assisting disabled people and for augmenting human performance. Up so far, no studies have succeeded in the power augmentation for the multi-DOFs robot based on EEG signals, especially for the complex shoulder joint. In this work, we propose an electromyography (EMG) estimation method based on electroencephalography (EEG) signals to...
A composite device structure on Silicon-On-Insulator (SOI) layer named Self-adjust Conductivity Modulation SOI-LIGBT (SCM-LIGBT) is proposed. It can be divided into three parts: the normal LIGBT region (NLT structure), the EM-NMOS region (ENM structure) and the diode region (DIO structure). The drain of the ENM structure is connected with the n+ emitter of the NLT structure while the p+ region in...
This work provides a physical insight into the failure of Superjunction MOSFET (SJ-MOSFET) for full bridge inverter system during an reverse recovery behavior. The inspection of failed SJ-MOSFET reveals burnt-out points in the vicinity of the device edge termination. To explore this result, physical TCAD simulations have been carried out. It is found that there is an extremely inhomogeneous reverse...
Saturable transformer and magnetic switch are the core components to realize the function of all-solid-state nanosecond pulse power supply. In order to further explore the effect of core materials on the performance of power supply and improve the compactness of power supply by optimizing the size of magnetic components, this paper analyzes the working state of the magnetic elements at each stage...
FBG inscribed on splice joint is proposed to be used as a sensor. It could realize temperature and strain measurement simultaneously because of the different strain responses of the different parts of the FBG inscribed on splice joint, while the temperature responses are same. The strain responses of four overlap values are discussed, which is used to optimize the discrimination capability of the...
Fiber Bragg grating(FBG) written in rotated fused polarization maintaining(RF-PM) fiber is proposed. The fiber structure constructs two Fabry-Perot interferometers. The spectral characteristics is analyzed and simulated. The Bragg reflection spectrum of fiber subjected to different loading angles are measured as the rotated fused angle is 22.5°. The experimental results show that the asymmetrical...
With the advent of the era of network, video surveillance technology is more and more integrated into the IT emerging technologies. Big data technology in the field of video surveillance has shown a broad development path. The research of surveillance video data mining based on big data is committed to achieve a perfect fusion of the big data technology and video surveillance business, in order to...
For modular multilevel converters (MMCs), it is important to investigate the electromagnetic and electrothermal performance of sub-modules for design validation and optimization. This paper presents an equivalent test scheme for sub-modules, which has the clear advantages of system simplicity and reduced facility requirements. Firstly, the detailed analysis on the output features of sub-modules demonstrates...
Mobile Crowd sensing is a new paradigm that encourages ordinary people to collect and share sensing data with their smart devices. However, the uncontrollable data quality is one of the critical problems that is potentially harmful to guarantee the availability and preciseness of mobile crowd sensing based services. In this paper, we propose a quality aware data collection mechanism based on a realistic...
The extraction of junction temperature Tj plays a critical role in the IGBT module reliability. In recent years, the extraction of Tj via parasitic parameters has drawn much attention for its ability to be integrated in the driver circuit. However, the aging of modules can affect the parasitic parameters, leading to the inaccuracy of Tj extraction when fatigue and aging occurs. Firstly, 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.