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.
Industrial Internet of Things (loT) brings more innovation space to the construction machinery industry. However, currently the application of IoT in vibratory roller is mainly reflected on the remote control of asset security and the basic data monitoring of equipment operation. In order to improve the intelligent level of vibratory roller and promote intelligent compaction on road construction,...
This paper presents a body-coupled ultra-wideband (UWB) antenna configuration for near-field microwave imaging applications. An UWB antenna is designed for wearable applications that will be require direct contract with the human body. In order to optimize antenna size and near-field radiation characteristics, to match the underlying body tissue, a stretchable dielectric spacer (a mixture of polydimethylsiloxane...
This paper presents a wearable antenna array which is constructed of 20 inkjet-printed monopole antennas for radar-based microwave breast imaging and diagnosis application. The wearable antenna in a hemisphere-shape dielectric spacer mold incorporates the proposed array of flexible ultrawideband antennas. The designed thin-film antenna has a 3.3 GHz impudence bandwidth which operates in the frequency...
In this paper, a novel dual-band dual-circularly polarized beam-switched antenna has been proposed. The 4×4 microstrip Butler matrixes in L and S bands are used as the feeding network of the beam-switched antenna. By the method of simulation and optimization, the results indicate that this antenna system has low return loss, and can generate four beams covering ±60° working area seamlessly with the...
This paper investigates the problem of power allocation for radar network in a cooperative game-theoretic framework such that the low probability of intercept (LPI) performance can be improved. Taking into consideration both the transmit power constraint and the minimum signal-to-interference-plus-noise ratio (SINR) requirement of each radar, a cooperative Nash bargaining power allocation game (NBPAG)...
We report on an Erbium-doped fiber laser operated at harmonic mode locking (HML) state with broadband spectrum. Stable pulse train emitted from the light source can continuously vary from 2nd to 17th order with spectrum bandwidth beyond 50 nm. The bandwidth can be up to 57 nm at 10th order HML. The pulse duration is measured to be 966 fs by an autocorrelator, and the corresponding time band product...
Wireless Video Sensor Networks (WVSNs) have been widely proposed for monitoring spatial environments. Dissimilar from traditional Wireless Sensor Networks (WSNs) where nodes such as thermal and light sensors are o.en considered in 2D and with omnidirectional sensing ranges, the sensing range of a video sensor in WVSNs is deemed as directional and usually cognized as a rectangular pyramid shape in...
Dissolved Gas Analysis (DGA) is one of the most effective methods in condition monitoring and fault diagnosis of oil immersed transformers. To facilitate the DGA data interpretation, investigation of fault gas generation under laboratory simulated faults using immersed heating method is often conducted. However, with immersed heating method, it is difficult to generate a stable thermal fault with...
We present the theoretical analysis of a three coupled resonator array without any mass perturbation and simulated results of its vibration behaviors under different exciting conditions. It can be concluded that the exciting condition mainly affects the sensing resonator's amplitude value instead of mode shape. Additionally, considering little influence on the mode shape caused by different exciting...
In order to decrease the measurement error of piezoelectric-cantilever current sensor caused by position and orientation errors, a position and orientation correction scheme including an array of piezoelectric cantilever and a system of nonlinear equations is presented in this paper. By solving the system with the values of piezoelectric outputs, current to be measured can be derived. Results of experiments...
This paper reports a new wrist vein biometric passive recognition sensor with preliminary verification based on a shuttle roller coaster structure. This sensor can obtain the vein images around the wrist to construct a 3D vein model for vein recognition. The experiment has proved that this sensor provide more information for the 3D vein modeling, which paves the way for the following design. It is...
A passive (power-less), bending type MEMS DC current sensor to satisfy the increasing needs of DC power supply for monitoring the electricity consumption by either one-wire or two-wire appliance cord was proposed in our past work (DTIP 2011). A MEMS-scale prototype DC sensor, comprised of 5 parallel PZT plates, was then micro-fabricated for preliminarily examination (DTIP 2012). A novel oscillating...
The use of vibration mode localization in arrays of mechanically-coupled, nearly identical cantilevers has been studied for ultra-sensitive mass detection and analyte identification. The effects of geometrical design of the coupling overhang, cantilever length, as well as the number of identical coupled cantilevers on the magnitude enhancement with a small mass perturbation were previously reported...
Cantilever based current sensor is attracting increasing attention recently because of its advantages like passiveness over other sensors and sequences of researches have been conducted. However, measurement error caused by position and pose errors is ignored in these researches. Although position and pose errors can be decreased by orientation and calibration generally, their negative influences...
The use of vibration mode localization in arrays of mechanically-coupled, nearly identical beam-shaped resonators has been studied for ultra-sensitive mass detection. In this paper, for the first time, we thoroughly summarized and compared different sensitivities of various cantilever structures on mass sensing. Meanwhile, from our analytical results, the expression of the highest sensitivity has...
This paper demonstrates a hybrid converter, which, for the first time, combines both the piezoelectric and the electromagnetic mechanisms in a ball-impact structure. The converter can harvest low-frequency vibration energy with an external power and has been proven to work in an environment with the ambient vibration frequency under 10Hz.
With the rapid increase in operating frequency in today's electronic systems such as computers and digital communication systems, VLSI interconnects become one of the critical issues in an overall system design, in recent years, research into the interconnect optimization problem has been very active, and several important progresses have been made. Recent advances in signal integrity oriented optimization...
Front-end modules (FEM) typically employ expensive III–V or SiGe technologies to provide relatively higher PA output power and lower LNA noise figure (NF) for larger distance coverage compared to what can be achieved in a CMOS transceiver SoC [1]. The WiFi FEM is typically designed as a standalone entity using linear and inefficient PA topologies, such as Class-A/AB, resulting in an FEM not taking...
980-nm angled cavity lasers with asymmetric high-order surface grating and longitudinal photonic crystal structure are designed and fabricated. The power of 847 mW/facet, FWHM of 1.5°×10.6°, and spectral linewidth of 0.0729 nm are obtained.
We demonstrate the generation of 11ps terahertz pulses from spectrally broad metal-metal quantum cascade lasers at 77K via active modelocking, and show the critical role of phase-matching between the terahertz pulse and the microwave modulation.
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.