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Based on the extended study of online payment and settlement, we investigated interesting research on the use of online payment by students. This study mainly investigates the use of mobile payment consumers in a university in Haining, Zhejiang Province in 2020. The research object of this time is a university in Haining, Zhejiang Province. Mobile payment is very popular among young people. In this study, a college student was taken as the object of investigation, with 436 samples N, and the effective questionnaires reached 96%. The correlation was investigated through factor analysis. In recent years, mobile payment system has been more and more popular and used by consumers. Mobile payment is mainly applied to online and offline payment such as two-dimensional barcode shopping (purchased from vending machines and supermarkets), payment by public transportation (bus and subway), and game of grabbing red envelopes. In this study, Likert five-point scale was used to conduct factor analysis, and reliability and validity analysis of this action payment on consumer satisfaction was conducted. Convenience, security, credibility and consumer satisfaction brought by mobile payment system are the main research directions of this study. In the process of research design, we designed three hypothesis models, hoping to verify whether the hypothesis has causal correlation through this model.

The goal of professional application-oriented construction is to improve students' practical application ability. Under the background of the integration of industry and education, the core ability of taxation major should be highlighted and cultivated is tax risk control ability. Such management ability is increasingly expected by the society among various abilities possessed by professional graduates. The author combined with the professional construction of the working university, from the content design, progress, training experience, optimization and improvement of professional core competence training to explore beneficial, to provide policy optimization suggestions for the cultivation of tax risk management talents.

Jichao, Z. and Jinxin, G., 2018. Investigating the durability and seismic performance of reinforced concrete piers within marine environments. In: Ashraf, M.A. and Chowdhury, A.J.K. (eds.), Coastal Ecosystem Responses to Human and Climatic Changes throughout Asia. Since the current reinforced concrete pier construction cycle is long and of poor quality, a method for studying the durability and seismic performance of reinforced concrete piers based on FRP anticorrosion reinforcement is proposed. First, the characteristics of reinforced concrete piers were analyzed, and the mechanics of reinforced concrete materials and the plastic hinge length of reinforced concrete were calculated. Then, FRP anticorrosion reinforcement was used to calculate the limit state of durability, environmental effect, resistance of durability, reinforcement design of reinforced concrete piers, and other aspects to complete the study of seismic performance and durability of piers. The experimental results show that this me...

We have developed and analysed logic NOR, NAND and XNOR gates based on two dimensional (2D) photonic crystals at a wavelength of 1.55 μm. The interference and self-collimation effects are used to design logic gates, which control the output by adjusting the phase difference to achieve constructive or destructive interference. The splitter is a line defect of the photonic crystal with a row of periodically arranged air rods. The radius of the defect rods depends on the function of the logic element. The use of these logic gates can reduce the size of logic devices.

A monolayer bend waveguide is designed based on the features of Rayleigh-Bloch (RB) mode wave in one-dimensional diffraction grating. The feasibility that the RB mode wave can transmit along the bend waveguide is demonstrated by the time-domain and frequency-domain finite element method, respectively. The results show that two different modes of transmission wave exist because of employing the circled unit cells. They possess different acoustical energy localization positions. In mode-1, the energy is localized between unit cells. In mode-2, the energy is localized in the center of unit cell, therefore, acoustic wave transmits with nearly no loss. Modulated sinusoidal wave and Gaussian pulse wave are used in the time-domain investigation. Because only RB mode waves can transmit and different modes have different energy distributions, the bend waveguide acts as an acoustic filter for the broadband waves. This study is conducive to the acoustic wave directional transmission, acoustic signal detection and identification.

In this paper, it is found that the coaxial transmission line between the matching box and the plasma reactor plays an important role in impedance matching of atmospheric-pressure radio-frequency capacitively coupled microplasma discharge characterized by very low capacitance value. The high output voltage across reactor terminal is generated when the external circuit is operating in resonant state driven by power supply. The experimental results show that coaxial transmission line exhibits capacitive characteristics within the working frequency range and its capacitance increases linearly with the length of the transmission lines; the resonant frequency and voltage across the terminal reactor decrease with the length of coaxial transmission line.

Wire of the brake pedal is not directly connected to the hydraulic environment in the braking By-wire system so the driver has no direct pedal feel. Then pedal simulator is an important part in the brake-by-wire system. A pedal force simulator was designed based on the traditional brake pedal curve of pedal force and pedal travel, AMESim and Matlab / Simulink were used as a platform to build simulation models and control algorithms. The simulation results show that the pedal stroke simulator and the control strategy meet the performance requirements of traditional braking system. It can be used in brake by wire system.

Motor of electric vehicle is able to be used to brake regeneratively, so braking energy can be recycled. Braking stability of electric vehicles with electro-hydraulic hybrid braking system can be influenced by braking force distribution between hydraulic braking force and regenerative braking force. In order to research on braking stability and braking energy recovery, simulation platform of electro-hydraulic hybrid brake system based on Carsim and Matlab/Simulink is built, and a control strategy of electro-hydraulic hybrid brake were proposed. The vehicle simulation models with electro-hydraulic hybrid brake system and with conventional hydraulic braking system were applied the brake on different adhesion coefficient separately. The simulation results show when electric vehicle is in the conditions of low braking intensity, all vehicle braking force is provided by regenerative braking force, and braking energy can be not only recycled, but brake performance requirement can also be satisfied; when electric vehicle is in the conditions of moderate braking intensity, regenerative braking and hydraulic braking are coordinated with each other, electro-hydraulic hybrid brake can not only satisfy the same and better brake performance, but also braking energy can be recycled and demand of hydraulic pressure can be reduced.

With the development of Internet technology, Internet security issues become increasingly prominent. People transfer a large amount of digital images on the Internet every day, in order to protect the security of the digital image, the most direct and effective way is to encrypt the digital image. Chaotic encryption system with natural characteristics, chaotic image encryption can effectively protect the safety of the digital image. This paper describes the chaotic image encryption & the image sharing algorithm research based on Wavelet transform and Chinese Remainder Theorem(CRT), researches the implementation of the algorithm, the Matlab simulation experiments of the algorithm explain the security of the algorithm.

In order to achieve effective control of thermal error compensation of computer numerical control (CNC) machine tools, the prediction accuracy and robustness of the compensation model is particularly important. In this paper, the temperature of sensitive points and thermal error of the spindle in Z direction are measured. Using a combination of fuzzy clustering analysis and gray correlation method to select temperature-sensitive points and then using multiple linear regression of least squares and least absolute estimation methods, distributed lag model, and support vector regression machine to establish prediction models of the relationship between temperature of sensitive points and the thermal error. Also, the temperature values of sensitive points and the thermal error in the experimental conditions of different ambient temperatures and different spindle speeds are measured. By comparing the prediction accuracy of various prediction models under different experimental conditions verify the robustness of the models. Experimental results show that when the modeling data are less, the prediction accuracy of multiple linear regression of least squares and least absolute estimation methods and distributed lag model is declined, and their robustness are poor, while support vector regression model has good prediction accuracy and its robustness remains strong when changing the experimental conditions. However, when modeling data are rich, the prediction accuracy of various algorithms is improved, but the robustness of support vector regression model is volatile. The robustness analysis of different models provides a useful reference for the thermal error compensation model, selection of CNC machine tools, and has good engineering applications.

The traction infinitely variable transmission (TIVT) used in the power train of electric vehicles (EVS) was designed. Firstly, based on the analysis of basic structure and working principle, the mathematic models were established on the transmission ratio, slipping ratio, transferring torsion and transmission efficiency; Secondly, Transmission characteristics of the TIVT were analyzed and calculated using ADAMS software. The calculation results show that: the export torsion varies with sway angle of steer ring as the import torsion is fixed. The transmission efficiency of TIVT is large when the motion of driving parts is pure-rolling or the slipping ratio is less. The efficiency could be reached more than 99% by rational designing. Theoretically, the driving distance of EVS matched with TIVT could be increased.

In the spatial coherent optical communication, after long distance transmission, the receiver needs to detect and extract the weak signal, and the balanced detection technology is the key technology in the coherent detection. Using balanced detection technology, not only can further improve the receiving sensitivity of coherent optical detection, but also can suppress the common mode intensity noise, so as to improve the output signal to noise ratio of the system. But the problems are (1) due to external causes (polarization control, input optical power loss error, atmospheric turbulence caused by decay, and so on),at both ends of the balanced detector’s input signal can not keep consistent (2) two arms of balanced detector electronic devices (including photodiode and amplifier electronic components) are difficult to achieve perfectly matched. The paper is based on the principle of coherent optical detection, firstly, the advantage of balanced detection compared to single detection is detailed analysis, it is shown that balanced detector used in coherent optical communication system and with the improvement of communication rate, this advantage will more obvious. The theoretical and experimental results have verified several important factors that affect the efficiency of coherent balanced detection, namely, the consistency of the detection response, the atmospheric turbulence and the tracking jitter. It is of reference significant to study the balance detection technology in the spatial coherent optical communication.

With the development of trusted computing, trusted computing model and trusted computing platforms are constantly changing, and becoming more and more perfect. In terms of the hardware platform, the trusted computing technology has been gradually matured. Many companies and businesses solve security problems by using trusted technologies. Trusted computing technology focuses on such as hardware, operating system and other aspects, wishing to build a complete, credible and reliable trusted platform. In this paper, the structure of the trusted platform has been described. Focus on Protected Capabilities, Integrity Measurement and Attestation which are the representative characteristics, some analysis and researches have been proposed. And analyze the main parts and priorities of the designing process of trusted platforms.

A model of thermal management for cooling system of aero-piston engine was presented in this study. The models of main parts in this system were also founded. Based on the measured value of temperature and pressure in the cylinder, the heat transfer coefficient between gas-fired and the cylinder wall was calculated by using the empirical formula. A heat transfer boundary condition between fins and cooling air was determined according to various Reynolds number of the air flow. Moreover, the method of finite element analysis was utilized to calculate the temperature of cylinder block. In the specified working condition of some two-stroke piston engine used in the unmanned aerial vehicle (UAV), the calculation and analysis were made to study on the effect of aircrew speed and flight height on the cylinder block temperature, as well as the effect of cylinder block temperature on airscrew speed by the thermal management model. The calculation results show that, as the flight height rises, the cylinder block temperature increases accordingly when engine power and airscrew speeds are kept constant; however, at the same height, the higher the airscrew speed is, the lower cylinder block temperature will be. The cylinder block temperature should be kept stable by regulating the airscrew speed.

Blue phase liquid crystals(BPLCs) show fast response time and macroscopic optical isotropy due to their double twist cylinder structure.With polymer stabilization,the thermal stability of BPLCs can be improved dramatically.However,it induces some problems to the electro-optic properties of BPLCs material such as high driving voltage,hysteresis and so on.In this paper,different concentrations of chiral dopant,polymer network of the BPLC,and temperature effect are investigated to improve the electro-optic properties of BPLCs and analyze the mechanism that affect the electro-optic properties of the BPLCs device.

In autonomous mobile ad hoc networks (MANETs) where each user is its own authority, the issue of cooperation enforcement must be solved first to enable networking functionalities such as packet forwarding, which becomes very difficult under noisy and imperfect monitoring. In this paper, we consider cooperation enforcement in autonomous mobile ad hoc networks under noisy and imperfect observation and study the basic packet forwarding among users through the repeated game models with imperfect information. A belief evaluation framework is proposed to obtain cooperation-enforcement packet forwarding strategies only based on each node's private information including its own past actions and imperfect observation of other nodes' information. More importantly, we not only show that the proposed strategy with belief system can maintain the cooperation paradigm but also establish its performance bounds. The simulation results illustrate that the proposed belief evaluation framework can enforce the cooperation with only a small performance degradation compared with the unconditionally cooperative outcomes when noisy and imperfect observation exist.

InGaN/GaN-multiple-quantum-well-based light emitting diode ( LED) nanopillar arrays with a diameter of approximately 200nm and a height of 700nm are fabricated by inductively coupled plasma etching using Ni self-assembled nanodots as etching mask. In comparison to the as-grown LED sample an enhancement by a factor of four of photoluminescence ( PL) intensity is achieved after the fabrication of nanopillars, and a blue shift and a decrease of full width at half maximum of the PL peak are observed. The method of additional wet etching with different chemical solutions is used to remove the etch-induced damage. The result shows that the dilute HCl ( HCl:H2O=1:1) treatment is the most effective. The PL intensity of nanopillar LEDs after such a treatment is about 3.5 times stronger than that before treatment.

In order to fully utilize the scarce spectrum resources, with the development of cognitive radio technologies, dynamic spectrum sharing becomes a promising approach to increase the efficiency of spectrum usage. Game theoretical dynamic spectrum sharing has been extensively studied for more flexible, efficient, and fair spectrum usage through analyzing the intelligent behaviors of network users equipped with cognitive radio devices. This article provides a game theoretical overview of dynamic spectrum sharing from several aspects: analysis of network users' behaviors, efficient dynamic distributed design, and optimality analysis

Since computer network has become the basis of the information society, network topology has also become an important part of network management. The theory foundation of the network topology algorithm based on SNMP has been introduced in this paper, and the algorithms of network topology discovery based on SNMP have been mainly focused on. The algorithms in the network layer and link layer have been compared and expounded, and then the advantages and disadvantages of them have been summarized in the end.

In order to solve the problem of methodology subjectivity, long modeling time and low classification accuracy in the information security risk assessment, a network security situation assessment model based on FAHP has been proposed in this paper. Via building a network security index system, using the analytic hierarchy process to calculate the weight of each evaluation index, taking fuzzy method to establish network security situation to determine the consistency of the moment, a comprehensive assessment of network security situation has been achieved. Examples show that FAHP not only improves the accuracy of network security situation assessment, but also is more objective at the same time.

In order to apply the spatial structure information to remote sensing interpretation through fractal theory, an algorithm is introduced to compute the single pixel fractal dimension in remote sensing images. After a computer program was written according to the algorithm, the ETM+ images were calculated to obtain their fractal data through the program. The algorithm has following characteristics: The obtained fractal values indicate the complexity of image, and have positive correlation with the complexity of images and ground objects. Moreover, the algorithm is simple and reliable, and easy to be implemented.

Video communication over wireless links using handheld devices is a challenging task due to the time-varying characteristics of the wireless channels and limited battery resources. Rate-distortion (RD) analysis plays a key role in video coding and communication systems, and usually the RD relation does not assume any power constraint. We investigate the relations of rate, distortion and power consumption. Based on those relations, we propose a power-minimized bit-allocation scheme considering the processing power, for source coding and channel coding, jointly with the transmission power. The total bits are allocated between source and channel coders, according to wireless channel conditions and video quality requirements, to minimize the total power consumption for a single user and a group of users in a cell, respectively. Simulation results show that our proposed joint power-control and bit-allocation scheme achieves high power savings compared to the conventional scheme.

Now the advanced visual simulation system is usually equipped with the large-wide projection or multi-projection display system, and several graphic workstations to achieve the real-time rendering task for multiple channels, which can provide the large field of view for user and bring the immersive feeling with the interactive devices' supporting. This paper presented a novel multi-channel visual simulation system with on one single PC, analyzed the system architecture of multi-channel visual simulation and the process of visual generation, studied the technology bottlenecks and the key factors of visual simulation expanding from single to multi-channel, and presented a visual simulation expanding scheme based on graphics card programming. The experimental results verified that this scheme has a more flexible and scalable architecture, a close or even better performance compared to distributed simulation system based on PC cluster, and easier to expand and upgrade, the system cost will be cut down. 1

Nowadays, the problems exist in campus-based network construction mainly are repeating construction, low utility of resources and so on. Cloud computing, as a new type of services computing which intends to share resources over long distances, provides a good technology reference for campus-based network construction. After an intensive study of the definition and features of cloud computing, the impacts cloud computing will make to the campus-based network construction are analyzed. Then, a cloud computing architecture model for service-oriented campus-based networks is brought forward. In this model, a brief description of every layer is given, which are Physics Resource Layer, Service Constructed Layer, Service Layer, Virtual Service Layer, Converge Layer and Application Layers. In addition, the process of cloud computing service interaction between users and the cloud computing systems is described. The model provides a feasible explore aspect in studying the cloud computing architecture for campus-based networks.

To improve the mechanical properties of concrete, Layered Hybrid Fiber Reinforced Concrete (LHFRC) was developed in this paper. Through comparative tests, the effects of layered hybrid fibers on a series of mechanical properties of concrete were discussed. The mechanical properties include compressive strength, tensile strength, flexural strength, compressive stress-strain relationship, flexural toughness and cracking resistance of concrete. The testing results and analysis demonstrate that layered hybrid fibers can significantly improve the flexural strength, toughness and cracking resistance of concrete while the cost of concrete increases slightly.

In this paper, we demonstrate an alternative approach to fabricating an electrically tunable holographic polymer templated blue phase liquid crystal grating. This grating is obtained by preforming a polymer template comprised of periodic fringes, and then refilling it with a blue phase liquid crystal. Compared with conventional holographic polymer dispersed liquid crystal gratings, our grating can remarkably reduce its switching voltage from 200 V to 43 V while maintaining a sub-millisecond response time. The holographic polymer templated blue phase liquid crystal (HPTBPLC) grating is free from electrode patterning, thus leading to a lower cost and more flexible applications.

Orthogonal frequency division multiplexing (OFDM) with multiple antennas makes it possible for efficient transmission of high-speed multimedia over wireless channels. This paper proposes an approach for power-efficient video transmission of MPEG-4 fine granularity scalable (FGS) bit-stream over OFDM systems with multiple antennas at both transmitter and receiver. Our proposed approach minimizes the total distortion while satisfying the constraint of transmission power, which is achieved by optimal power allocation and transmission rate control of power efficient assignment of scalable source to spatial subchannels. The performance of our proposed scheme is compared with one using fixed transmission rate or power allocation. Simulation results show significant performance gain of our approach.

In this paper, we address the problem of video broadcasting over the orthogonal frequency division multiplexing (OFDM) systems with multiple antennas in both transmitter and receiver. In broadcast scenario, we propose to utilize the scalable video source with multiple description transcoding to provide multiple replicas for transmission, and post-processing is proposed to acquire parallel spatial subchannels. Our proposed approach minimizes the maximal performance degradation for video broadcasting users with power-efficient assignment of source descriptions to spatial subchannels. The proposed system efficiently combines progressive source coding with MIMO channels to implement robust video broadcasting over MIMO-OFDM systems. Simulation results demonstrate the advantages of our proposed approach.

Audio broadcasting over wireless networks is a challenging task due to the limited bandwidth of the wireless channel and limited battery resource in the handheld devices. This paper proposes a power-efficient distortion-minimized rate allocation approach, which maintains the power consumption constraint at the mobile hosts and meanwhile minimizes the total distortions for group users in wireless systems. The performance of our proposed scheme is compared with a fixed rate allocation and downlink power controlled scheme in cellular CDMA systems. The simulation results show that our proposed power-efficient distortion-minimized scheme achieves significant performance gains of audio quality compared to the fixed scheme.

Video communication over a wireless link is a very challenging task due to the time-varying characteristics of the wireless channel and limited battery resources in the handheld devices. This paper proposes an end-to-end power-optimized approach for video communication. The power consumed in complexity-reconfigurable source coding, channel-adaptive unequal error protection (UEP), and video transmission is analyzed. Power-minimized rate allocation is presented to achieve the minimal power consumption in the mobile host while maintaining the desired video quality. Simulation results show that our power-optimized scheme achieves significant power saving compared to the existing scheme.

Video communication over wireless link is a challenging task due to the time-varying characteristics of a wireless channel and limited battery resource in the handheld devices. This paper proposes a power-optimized approach for video communication, which simultaneously controls the transmission power, source rate and error protection level to minimize the total power consumption for all users. The performance of the cellular CDMA system using our proposed scheme is compared with the one using a fixed power-control scheme. The simulation results show that our proposed joint power control and source-channel coding scheme achieves significant power saving compared to the fixed scheme.

To meet the needs of ocean exploitation, manned submersibles, ROV, untethered submersibles etc. have been developed in China since the early 70's. The first manned submersible had a length of 15 meters, 35 tons of displacement and the capability of diving to a depth of 600 meters and was successfully put into service in 1986. The first ROV was developed and reached a depth of 199 meters in an ocean experiment in 1986. In the meantime, a series of observing submersibles such as JH01, SJT-5, SJT-10, SJT-40 and atmospheric diving suits KZF-1 and QSZ-1 were developed and most of them have been used in diving experiments. From 1990 China Academy of Science and SJTU also developed the autonomous vehicle Explorer-1 and CR-01 etc. In 1995 the 6,000 meters deep tow survey system was co-developed by SJTU and DOE. The system completed the task successfully in 1998. The subsea pipeline and cable burying, inspection and maintenance technology is being developed by SJTU and ShengLi Oil Company.

Objectives To investigate the effect of simvastatin intervention on the changes of blood pressure, serum lipid fluctuation and aortic configuration induced by high sodium plus high fat diets in rats. Methods Sixty adult male SD rats were randomly divided into five groups (n=12); control group (N), high salt group (S), high fat group (F), high salt+high fat group (SF) and high salt plus high fat+simvastatin group (T). After fed for 16 weeks, the rats were subject to determine blood pressures and serum concentrations of TC, TG and sCD40L. The expression of CD40/CD40L in the root of ascending aorta was detected by immunohistochemical method. The thickness of intima media in the ascending aorta as well as the ratio of lumen area/total vascular area were measured and calculated after HE staining. Results In S group, F group and SF group, systolic blood pressure was significantly higher than that in N group (p Conclusions Feeding high fat plus high salt leads to blood pressure elevation, induces atherosclerosis, increases serum concentrations of sCD40L and enhances the expression of CD40/CD40L in arterial tissues. The combination of stimulus has stronger effect than a single factor. Statins protect the arterial tissues against atherosclerosis by decreasing the level of serum sCD40L and inhibiting the expression of arterial tissues CD40/CD40L.

Using the first-principle method within the generalized gradient approximation, in this paper we study the band structure, state density and doping level of transparent conductive oxide CuScO2. The calculated results show that the valence band of CuScO2 is composed mainly of 3d of Cu, and 2p of O; while the conduct band is comprised mainly of 3d of Sc. Through the +U correction, with the increase of the value of U, the conduct band of CuScO2 becomes split, and results in the enlarged band gap, which shows that the +U correction can improve the band gap of CuScO2. By comparing all kinds of dopant level in CuScO2, it found that the substitution of Mg for Sc can effectively improve the p-type conductivity in CuScO2.