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In this paper, we propose a robust Student's t filtering algorithm designed for Cooperative Navigation (CN) for Autonomous Underwater Vehicles (AUVs). In a CN system, an acoustic communication technique is usually used to exchange information and measure range between AUVs, and many cheap but low-accuracy Micro-Electro-Mechanical Systems (MEMS)-based Inertial Measurement Units (IMUs) are used as Dead-Reckoning...
Based on the organizational support theory, this paper studied the effect and mechanism of corporate engagement marketing strategy on customer perceived support and customer willingness to engagement. The cross level analysis methodology was adopted for analyzing 43 domestic video website of 215 employees and 1075 customers. The results showed that corporate engagement marketing strategy had a significant...
To improve cancer survival rates and prognosis, one of the first steps is to improve our understanding of contributory factors associated with cancer survival. Prior research has suggested that cancer survival is influenced by multiple factors from multiple levels. Most of existing analyses of cancer survival used data from a single source. Nevertheless, there are key challenges in integrating variables...
Deep learning is nowadays one of the most popular research topics in computer science. In recent years, the extensive application of convolutional neural network has made it become a new direction for the computer architecture research that is developing rapidly. Currently, there is a growing demand on off-line deploying deep learning network on top of embedded mobile systems. However, how to balance...
By using a virtual campus, users can not only immerse in the campus scene, but also interact with the system, which helps them understand the campus rapidly and deeply. But the virtual campus itself doesn't provide the relevant data information of the campus scene, which severely limits its application to a certain extent. To solve this problem, oriented to Beijing Institute of Petrochemical Technology...
Owing to the energy shortage and the increasingly serious environmental pollution, fuel cell electric vehicles (FCEV) with zero-emission and high-efficiency have been expected to be the most potential candidate to substitute the conventional vehicles. The DC/DC converter is the interface between the fuel cell (FC) and the driveline of FCEV. It not only needs high voltage gain to convert the wide FC...
Based on a broadband near-zero refractive index metamaterial, the unit structure is simulated by electromagnetic software HFSS, and its reflection-transmission parameters are extracted. And the classical inversion algorithm is used to derive the band in the 16–17.5GHz with the same permeability and permittivity. However, the effect of near zero effect is not ideal and the refractive index is zero...
Based on the traditional I-shaped metamaterial structure, a new type of notched I-shaped structure is designed, and the reflection — transmission parameters are extracted by electromagnetic software HFSS. And the classical inversion algorithm shows that the structure can obtain the properties of permeability and dielectric constant in the range of 9.89 ∼ 10.24GHz.
Understanding of the propagation of ultrasound through a bubbly medium is a challenging task because of the nonlinear dynamics of the bubbles and their effect on the attenuation and sound speed of the medium. The majority of the studies on this subject apply linear models, which will generate inaccurate results, especially at higher-pressure excitations. These studies have also ignored the effect...
Understanding of the propagation of ultrasound through a bubbly medium is a challenging task because of the nonlinear dynamics of the bubbles and their effect on the attenuation and sound speed of the medium. The majority of the studies on this subject apply linear models, which will generate inaccurate results, especially at higher-pressure excitations. These studies have also ignored the effect...
A W-band backward wave oscillator (BWO) based on metamaterial (MTM) slow wave structure (SWS) is presented as a novel high power microwave generator. Particle-in-cell (PIC) simulation is performed to evaluate the efficiency of the W-band MTM-based BWO (MTMBWO), and the MTMBWO can reach saturated output power of 2.78MW with an electronic efficiency of 31.68% at frequency of 84.87GHz.
A 0.38THz Traveling Wave Tube (TWT) based on the sine waveguide and sheet beam tunnel is proposed to amplify the terahertz wave. In this paper, the high frequency characteristics of sine waveguide with sheet beam tunnel are calculated by 3-D high frequency simulation software. From the particle-in-cell simulation results, this beam-wave interaction can produce output power 13W at 0.38THz, and the...
In order to solve the inconsistency of the battery pack in the traditional battery energy storage system, a new type of battery module energy storage system topology and control strategy based on flexible grouping is proposed——Modular Battery Energy Storage System Based on One integrated Primary multi-secondaries transformer. Different from commonly used full-power control mode, the part-power control...
We numerically investigate the effects of a minute femtosecond pulse seed on continuous wave pumped supercontinuum generation when the frequency shift of the seed varies.
A detailed fiber design was presented for the first time for three-stage non-integer order soliton compression at the wavelength of 1060 nm. A compression factor of 173.52 was realized, and the remained pedestal is only 32.21%.
Iris recognition is one of common biometric identification technologies, and an important part of iris recognition is iris location, whose precision directly affects the accuracy of iris recognition. Fitting the inner and outer edge of iris as an approximate circle is a common iris location method, which thereby can lead to fitting errors between the location result and the actual edge. In order to...
Half-Rotating Wing (HRW) is a new type of analogous flapping wing system with rotating flapping used as a substitute for oscillating flapping. Estimating method of flight lift generated by HRW was one of the significant theoretical basis to design air vehicle. The working principle of HRW based on Half-Rotating Mechanism (HRM) together with the spanwise airflow and chordwise airflow generated during...
This paper describes a novel Ku/Ka band reflectarray antenna for operating at arbitrary polarization. The reflectarray elements consist of two different types of elements: cross-dipole element with fixed-dimension ring for the lower band, and the ring element with round patches for the upper band. Furthermore, the parameters of the element are optimized to suppress the coupling effects. The simulated...
In this paper, we propose a compact wideband antenna. The operation band of the antenna covers from 3 GHz to 30 GHz with dimensions of 25 mm× 25 mm. The measured antenna S-parameters are in good agreement with the simulated ones. Furthermore, based on the proposed wideband antenna, a two-element multiple-input-multiple-output (MIMO) antenna with high isolation is developed due to its orthogonal polarization...
Based on the existing relevant theoretical literature arrangement, according to the scale development process, we collect engagement marketing strategy measurement items suitable for Chinese enterprises. In the course of the study, the literature review and open-ended questions interview are adopted. Through the pre-survey and large sample survey, we develop the engagement marketing strategy scale...
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