The measurement and control system works under the non-coherent system. When the nominal frequency of the star is not consistent, the velocity measurement results introduce the system error. In order to eliminate this kind of influence; this paper analyzes the influence of the inconsistency of the nominal...

The application of solid-state power amplifier in the transmitter has been more and more extensive. This paper analyzes the working principle of a balanced-type solid-state amplifier module based on GaN, and analyzes its common failure mechanism. Design, for most of the solid-state power amplifier module...

There are many defects in traditional file service system, and this paper suggests a new system that based on the semantics of big data. It introduces some concepts, such as big data, semantic and information retrieval firstly. Secondly it introduces the key techniques. Then it analyzes and designs the...

When the target is in a high dynamic motion, the target sends the downlink signal Doppler and its rate of change is very large, which brings a lot of problems. The phase-locked loop is a closed-loop automatic control system that tracks the phase of the input signal. In this paper, the basic principle...

In this paper, the composition and principle of the existing spread spectrum measurement and control system are analyzed, and the characteristics of the signal Doppler shift and noise are discussed. The general concept and theoretical basis of the spread spectrum signal processing are established.

For low SNR actual spread spectrum telemetry applications, large Doppler shift characteristics studied in low SNR, FFT-based fast acquisition of pseudo-code methods, theoretical analysis and simulation results show that the method can significantly reduce acquisition time and improve acquisition performance.

To realize the sustainable development of the Yellow River delta regional economic, must improve the environmental quality, improve the resource environmental bearing capacity. This study used principal component analysis (pca) method to evaluate resources environmental bearing capacity of dongying city...

From different angles on the relationship between air pollution and meteorological elements preliminary studied, this research adopts the method of orthogonal analysis, by the analysis of day-to-day relationship between AQI (Air Pollution Index) and meteorological conditions of the Jingjinji District....

Speech coding is a technique that transforms speech signal of big data to digital signal of small data. This characteristic is suitable for the underwater acoustic transmission of narrowband communication. It's one of the support to underwater acoustic high speed voice communication on the source code...

The topic of this paper is the damping capacity of injector-formed baffle and normal blade baffle in a liquid rocket propellant rocket engine. High frequency combustion instability of a liquid rocket engine is investigated numerically, and the mechanism of high frequency unstable combustion is analyzed....

PIV (Particle Image Velocimetry) technology is a transient, multi-point and non-contact speed measuring method of fluid dynamics, playing more and more important role in experimental fluid mechanics. The measurement of supersonic complex flow field has high requirements for PIV experimental configurations....

To study the effect of quasi-DC discharge plasma on the cold flow field, under the low equivalent ratio of ethylene and air in the combustor of scramjet, a quasi-DC discharge plasma model crossed the front wall of the cavity has been settled. Under the different plasma actuation intensity, the effect...

Single and twin jet flow control by surface dielectric barrier discharge plasma actuator is studied in this paper. The plasma actuator is placed on the exit of a rectangular nozzle and particle image velocimetry method is adopted to measure the jet flow velocity and conduct flow visualization. The test...

To obtain the concentration field and the optimized ventilation mode of propellant storehouse, the thesis makes computational fluid dynamics (CFD) simulation to the storehouse with the boundary conditions and 3D models of original and optimization design. Positive pressure ventilation (PPV) is a successful...

Non-toxic, pollution-free loading system of lox is used in new launch vehicles. In the progress of loading or venting lox, the accident detachment of fuel connector will lead to leakage and diffusion of lox. Low temperature and oxygen enrichment caused by lox leakage will bring great damage to workers...

The propagation of TNT blast wave in the air is simulated by using the LS-DYNA finite element analysis software, to study the influence of boundary condition on the overpressure of blast shock wave. In the simulation, three kinds of blast equivalent are selected, which are 5.12 kg, 51.2 kg and 512kg....

The non-equilibrium plasma has unique advantages in ignition and combustion. In this paper, the plasma-assisted combustion scheme of the spacecraft rocket engine is designed. The numerical simulation method is used to study the influence of non - equilibrium plasma on the combustion in GH2/GO2 single...

In order to explore the contra-rotating axial flow pump design method and analysis its hydrodynamic performance, the inlet and outlet velocity triangle of front rotor and rear rotor was analysed, then, a high specific speed contra-rotating axial flow pump was designed using three dimensional method based...

we studied the mechanism of original n- and p-type "intrinsic" organic films 8-Hydroxyquinoline aluminum (Alq3) and N, N'-bis-1-naphthyl-N, N'-diphenyl-1, 1'-biphenyl-4, 4'-diamine (NPB) via using molybdenum trioxide (MoO3) as a p-type dopant. It is found that the conductivities extracted from "holes-only"...

From the point of view of 2001-2015 new energy automobile industry policy in china, the author reviews the new energy automobile industry policy in the three five-year plan period, and the three periods were defined as the science and technology strategy stage, industry strategic stage and national strategic...

Advanced biodiesel derived from waste cooking oil (WCO) is a promising diesel alternative because of its renewability and its less negative impact on food supply as compared to traditional biodiesels. WCO biodiesel can be catalytically produced from waste cooking oil and alcohol through the process of...

For the problems of the unfairness of the human-computer interface in the process of traditional aircraft virtual assembly, the simulation results are not intuitive and the operator cannot directly observe the changes and adjustment of the parameters during the operation of the control system and so...

Half-Crank Internal Combustion Pump (HICP) is a new type agricultural power machine converting indicated work into pressure energy, whose crankshaft comprises only half a crank, reciprocating inertial forces of cylinders can entirely counteract each other, the structure is simple and compact, the route...

To study the sleeve structure under the axial pressure, taking the contact process of the inner core into account, the deformation process of point contact between the inner core and the flexible sleeve was studied theoretically. The second order differential equilibrium equations of a small deflection...

Unreasonable road design and disordered traffic conditions may trigger accidents. As a part of highway design, tollbooth has close relationship with road safety, and there are many security problems in actual operation and management.It's necessary to establish a security model that can assess the safety...

Aiming at the problem of reliability estimation of mechanical products in small sample size and time censored test under Weibull distribution, this paper proposed a method which combined Bootstrap and BP neural network for reliability evaluation. Firstly, Bootstrap method was used to expand the reliability...

This paper presents a method of route leak anomaly detection based on optimized "valley" rule. This paper amended the "valley" rule which used to detect route leak anomaly to improve the route leak detection precision. The experimental results show that the AS relationship recognition algorithm can recognize...

The purpose of edge detection is to distinguish different regions of the image, usually the edge information is determined by the gray-scale change between regions. In the image with noise, the traditional edge detection method is easy to determine the noise as the edge point. While adding filtering...

As the hub equipment in the distribution network, the transformer fault is difficult to diagnose because of its complexity and diversity. The reasons causing these failures are very complex and unobvious which make the transformer fault diagnosis and analysis very difficult. If the state of the transformer...

In order to solve the problem that the stepping motor in the manipulator is frequently stopped and the conventional index algorithm can not make full use of the output torque under the high speed heavy load,the two-stage exponential acceleration algorithm for stepper motor is proposed.Based on the critical...

The separation of elements is achieved by ultra-performance liquid chromatography system for Aflatoxins, the use of a closed-loop feedback control system is to produce a stable continuous wave light source, fixed wavelength of 360nm illumination light source onto the separation of elements, resulting...

Airspace planning of tactical training is a centralized planning, which is typical for Air Force tactical training. Because of the complexity of airspace and the diversity of training courses, artificial packing can't guarantee the utilization rate of airspace. Due to the irregularities of airspace,...

Greedy algorithm is a common-used method to solve many different types of problems. Researches were done a lot that use greedy algorithm to solve classical transportation problems. This paper discussed how to apply greedy algorithm in transportation problems with warehouses location. The main idea of...

Intrinsically Disordered Proteins (IDPs) are a class of proteins that have no sure tertiary or secondary structure in the natural state. They are widely found in nature and involved in cell signal transduction, regulation, and protein interactions with a wide range of human diseases related. The research...

VLAD (vector of locally aggregated descriptors) is a type of global features extracted from the image, which is always used in image retrieval. Although VLAD is effective, it still needs to improve. VLAD is obtained by accumulating residuals, ignoring the number information of descriptors in a cluster....

With the development of precision engineering and precision instruments, the micro-nano platform becomes the important carrier in the precision positioning technology, which provides large torque and high precision. In this paper, a kind of large torque micro-nano platform is designed and created, which...

In order to find the optimal scheduling, to ensure the global optimization, and to adapt to the dynamic environment, the adaptive capacity remote sensing data cloud platform scheduling strategy is proposed based on the cloud platform high score data storage model. The main contents are as follows. The...

With the development of precision engineering and precision instruments, the micro-nano platform becomes the important carrier in the precision positioning technology, which provides large torque and high precision.The platform's performance is tested by using laser displacement meter.Four kinds of testing...

The purpose of this study is to solve the computer security problems. Based on the traditional security model, the hidden dangers of computer security and the advantages and disadvantages of various intrusion detection techniques are analyzed. A computer intrusion detection system based on an improved...

This paper analyzes the feasibility of the application of mobile learning in the course of basic biochemistry from three dimensions of mobile learning identity, mobile learning hardware and mobile learning resources. On this basis, the paper constructs a mobile learning mode which is in accordance with...

With the continuous development of network technology, more and more people are fond of shopping online, the popularity rate of shopping online with the mobile devices is also increasing. However, consumers' trust has become one of the main factors hindering the mobile e-commerce development. In this...

Passenger cabin is considered as one of the most important areas in the civil aircraft, and the cabin layout patterns significantly influence the passengers' comfort, airways' profits and the brand images of companies. This research is geared to the needs of dual-channel large aircraft cabin layout and...

In order to improve the nutritional value of the noodles products, we added some ingredients in noodles and Moringa noodles were made. In this paper, the wheat flour was used as the raw material, adding appropriate amount of Moringa powder, and study on the formula of Moringa noodles. The experiment...

Block diagram of digital part for portable IC is given. Three ways to reduce the power consumption of digital circuit are introduced. Several circuit modules of analog part for the portable IC are listed, and low power design for these modules are described in detail.

Since the theory of campus informationization proposed in MIT, the information management system, as the most effective method used in campus, has become universal in the worldwide. Many China universities have developed or purchased its own integrated educational management system to satisfy the requirements...

At present, the new generation of information and communication technology, represented by Internet of Things, big data and cloud computing, is developing rapidly. Internet of things technology is accelerating to intelligent medical, new energy, materials and other areas of penetration through the continuous...

A kind of nonwoven containing ferulic acid is prepared by electrospinning method. It was observed that the diameter of the fiber was about 200 nm by SEM. The antibacterial activities against Escherichia coli and S. aureus were also investigated. The result showed the nonwoven prepared was effective against...

This paper discusses the Dandong overlapping tunnel project in terms of the stability of existing tunnels by the approaching construction of overlapping tunnels. It uses the Peck formula and the theory of the Kinkler elastic foundation beam. The numerical model is established using MIDAS-GTS. The deformation...

In recent years, urban underground pipeline accidents have occurred frequently, which caused huge losses of property and personal injury. In order to ensure the safe operation of urban underground pipeline and strengthen the urban underground pipe network in all directions, in this paper, using the Java...

In view of the current evaluation of the assembly quality of the standard components, the artificial visual method is used to judge it. However, when people do it repeatedly and in a high-intensity, which is difficult to meet the needs of large-scale industrial production. In this paper, according to...

It briefly introduces the characteristics of prestressed CFRP plate and the new reinforcement bridge technology of prestressed CFRP plate and conducts a theoretical analysis on the principle of reinforcement design in this paper. ZhuJinDu Bridge is provided with reinforcement design by the prestressed...

Climate is an important factor that affects the production and life. The ecological environment in the northwest Yunnan is fragile, which is greatly affected by climate change. This study is based on the analysis of climatic indexes from 1950 to 2013 in northwest Yunnan, Using SPSS means to deal with...

This Through the measurement of the hydration heat, the thermo analysis, SEM observation, and analysis on pore structure of the cement paste, we did the research on the effects of Alcamine Periodic Copolymer (APC) grinding aids on hydration and microstructure of Portland Lime-Mud Cement (PLMC). The result...

During pyrolysis of tobacco rob (TR), the operating parameters such as the temperature, the heating rate, and residence time and particle size affect the process and result of the pyrolysis. Some of these parameters have been closely considered but the particle size of TR is often ignored. In this study,...

In this paper, the contact fatigue crack propagation behavior of Cr7C3 coatings was studied by means of extended finite element method and linear elastic fracture mechanics. The contact fatigue model of simplified geometric model was established by commercial software ABAQUS. The influence of the thickness...

This paper has designed and analyzed a kind of parallel manipulator with redundant actuators. The manipulator has different DOFs and motions comparing to conventional parallel manipulators, which is mainly used to simulate various position of heavy, large equipments (such as buses, trucks), due to the...

A 2015 report by the South African Institute of Risk Management warns that without urgent repairs, the whole Kariba dam will collapse. It has also led to the crisis of the Kaliba dam more and more concerned by the world. In order to study the feasibility of building a number of new dams to replace the...

With the United States retain its position as the top medal-winning nation at last year's Olympic Games in Rio, the most greatly desirable event came to the end. Is the result the same as your expectation? Is it possible to predict how many medals each nation will win? And what is it about a nation that...

Aiming at the practical issue of multi-sensor data fusion in target tracking, this paper proved that the accuracy of multi-sensor data fusion is better than that of any one sensor in terms of accuracy definition. According to the proof method, we proposed a multi-sensor data fusion method by combinating...

In the paper, we analyze the factors of mutual inductance between two coils in magnetically coupled wireless energy transmission system based on the resonance frequency of 85 kHz. When the radius of transmitter coil remains the same, the simulation analysis of the main geometric parameters such as the...

For the research of a certain unmanned aerial vehicle's inertial navigation system and flight control system, a simulation system of the three-axis turntable is designed. This system adopts host computer and turntable control computer. S-Function with C++ language is used in the host computer to establish...

A mathematical model of resistance type superconducting fault current limiter (R-SFCL) is established and the influence to power frequency variation distance relay has been analyzed firstly. Then, it indicates that the input of the superconducting current limiter changes the circuit model before and...

A novel dry electrical discharge micro-grinding (EDMG) method was proposed to grind tungsten carbide in this paper. The V-shape tip truing experimental setup was built to realize the precision truing of diamond grinding wheel micro tip. The trued V-tip diamond wheels after mechanical truing and dry ECD...

The original data about the operation status of IT infrastructure is stored in the log. It can not only reflect the operation status of the whole system but also provide the basis for the management and optimization of IT operation and security analysis. This paper has summarized the infrastructure of...

An improved tactical significance map (CTSM) algorithm based clustering coefficient is proposed to deal with the multi-property targets prioritizing problem. The CTSM algorithm combines the target clustering coefficient with the traditional tactical significance map algorithm. The improved algorithm...

In order to improve the matching precision of the SURF image feature points, we study the relationship among the scale of the SURF feature points, the characteristics of strength and matching precision. Then, a feature point matching algorithm of SURF image feature is proposed, which is adaptive to the...