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Evaporation duct is an anomalous atmospheric surface layer over the sea surface and has severe influence on the microwave propagation. The evaporation duct height, which implies the strength of the evaporation duct, is an important physical quantity. Based on National Centers for Environmental Prediction Climate Forecast System Reanalysis data and the evaporation duct model, high spatial resolution...
Evaporation duct has strong impacts on the performance of marine radar and communication systems. Evaporation duct channel is a promising channel for marine high capacity data transmission. Wave propagation models and evaporation duct models are well studied, and statistical features of duct channel has been observed. However, the work on the physical model of small-scale characteristics of evaporation...
A high dimensional shape space is formed by the continuous shape sequence sub space, and the deformation between these shape profiles can be expressed as a linear combination of the low dimensional sub shape space. In order to meet the demand of quantitative description and analysis of shape sequence deformation, Firstly, we proposed a deformation factor of shape sequence based on graphics regularization...
Soft actuators have allowed for a variety of innovative applications, however, the mathematical modeling of soft actuators is still in its infancy. In this paper, we present a multi-cavity composite soft pneumatic actuator constitutes of multiple layers with embedded multiple air channels. The principle of operation of this actuator is comprehensively analyzed and described through building the analytical...
Soft actuators are a critical component of soft robotic systems, the multi-cavity composite soft pneumatic actuators have wide potential applications due to their ability to generate complex motions. A timesaving and flexible fabrication process of this actuator was presented in this paper. Then, we analysed and proposed the parameters of the material and proved its validity by comparing the result...
We fabricate a Fabry-Perot resonator in a LiNbO3 subwavelength slab and investigate the spatiotemporal evolution of terahertz pulses in the structure via time-resolved imaging system. The wave confinement and standing wave modes are clearly observed.
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...
Due to the intermittent feature of renewable energy sources, energy storage units are needed in order to balance the electricity generation and consumption. Interface circuit is an important component of the energy storage system. This paper presents a non-isolated four-port dc-dc converter for the independent photovoltaic power generation system. The proposed four-port dc-dc convert is used to interface...
Physically Unclonable Functions (PUFs) offer enticing possibilities to incorporate hardware-based security on semiconductor device level. In order to make efficient use of PUF functionality in lightweight cryptographic applications, a low-overhead implementation in terms of chip area and power consumption is required. In this paper a fully differential readout circuit is proposed that allows the generation...
A soft-switching solution implemented to the traditional bidirectional DC/DC converter is developed. The soft-switching cell, which composed of three auxiliary switches, one resonant capacitor and one resonant inductor, is equipped in the traditional bidirectional DC/DC converter to realize circuit ZCT or ZVT operations in both energy transmission directions. Two driving methods are presented to charging...
The Particle Swarm Optimization (PSO) has been widely used to solve the selective harmonic elimination (SHE) problem, however, the executing efficiency is not very good if it is implement on the traditional Central Processing Units (CPUs). In this paper, the PSO is parallel implemented on the Graphical Processing Unit (GPU) under the Compute Unified Device Architecture (CUDA). Then, the GPU-accelerated...
In this paper, a current control is studied based on D-Σ digital control to improve the grid-connected performance for a three-level T-type inverter. The control principle is analyzed in accordance with the single-phase equivalent circuit of the three-level T-type inverter. The influence of the neutral-point voltage on both output current error and modulation signal is discussed, and the relationship...
This paper reports a highly sensitive distributed optical fiber sensing technique based on resolving the optical interference information in the microwave frequency domain. This technique uses a microwave intensity modulated coherent light through cascaded weak reflectors along a single mode fiber (SMF). The microwave is used to resolve the location of each reflector along the SMF. The coherence length...
A stray gassing test device for transformer oil under condition of coincident electric field and temperature was developed and the corresponding test method was established independently. Influences of oxygen, temperature, electric field strength, metal deactivator content on the transformer oil stray gassing were studied, and the reason for hydrogen overproof was analysed. The results showed that...
This paper proposes a duplex mode selection strategy in a full-duplex (FD) self-organized small cell network. We aim to maximize the sum rate of small cell base stations (SBSs) subject to the quality of service (QoS) of the macro users (MUEs) and the small cell users (SUEs). For this formulated problem, two stages for this selection is considered: user pairing and channel allocation. In the first...
Co-simulation can greatly improve the simulation accuracy by integrating advantages of different software in a unified system. In this paper, co-simulation of energy management strategy for hybrid electric vehicle (HEV) is implemented through the secondary development in AVL InMotion system. Firstly, the models of the virtual driver, 3D road and traffic environment are realized in IPG CarMaker. Secondary,...
The design, fabrication and testing of a novel resonant accelerometer integrated with a temperature sensor is presented in this paper. The accelerometer consists of double quartz resonators and a silicon substrate. A novel diamond like carbon (DLC) film with special electrical property, excellent mechanical property and chemical stability, which has negative temperature coefficient of resistance (TCR),...
Continuous correction of train absolute position in local area is accomplished by connecting distance detect sensor group to on-board Automatic Train Protection (ATP) system and installing the height difference positioning matrix on the wayside. The on-board ATP system can detect every unit height of the height difference positioning matrix row element, and transfer the heights into a unique position...
There are two typical types of sampling mode in the geolocation of satellite interference: ultra-wideband sampling and narrowband sampling. Besides the measurement error, in narrowband case, the process of ephemeris correction will introduce considerable approximation error and crystal drift error in down convertor (DC), due to both the time-varying feature of ephemeris and non-synchronous sampling...
This paper reports on the layout optimization of Pt-AlGaN/GaN HEMT-sensors for enhancing hydrogen sensor performance. Sensors with gate width and length ratios Wg/Lg from 0.25 to 10 were designed, fabricated and tested for the detection of hydrogen gas at 200 °C. Sensitivity, sensing current variation and transient response are directly related to the sensor gate electrode Wg/Lg ratio. The obtained...
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