High density assembly of aerospace electronics equipment is an important direction of research linking technology. Based on the experiment, the paper complete the solder of high density aerospace products under different welding parameters , including PBGA and CBGA in different sizes. Secondly, execute...

Many failures of power cable system expose that power cable accessories are the main weak point because of frequently poor workmanship and low-quality when installed on-site. That introduces a question that could we use another method to reduce power cable accessories failures rate. Mould Melt Joint...

The channel system parameter of phase noise has an important influence on the performance of the radar receiver. With a brief introduction to the concept and formation mechanism of phase noise, the research was focused on local oscillator phase noise, which has the greatest impact on the performance...

It’s significant to isolate micro-vibration interference from ground to precision instruments, so lots of scholars have paid attention to study vibration isolation mechanisms and got a fruitful outcome. The most important characteristics of a passive vertical vibration isolator are natural frequency...

the paper has researched the relevant authority standards of domestic and international such as ISO 10423, ISO 13628, API SEPC 17D, ISO 13679, ISO 21329, API Spec 6A, then determined the designed parameters of the temperature pressure test connector. And, the test device was designed according to the...

The corresponding variation form of the Z-domain transfer function of switched -capacitor integrator(behavioral simulation model) under the impact of op-amp’s four nonlinearities are explored in detail in this paper, which are finite direct-current gain(FDCG), nonlinear direct-current gain(NLDCG), slew...

Power big data is big data concepts, technologies and methods practiced in the power industry. Power big data related to electricity generation, transmission, substation, distribution, electricity, dispatching the links, cross-unit, multi-disciplinary, cross-business data analysis and mining. Big data...

This paper analyzes the information security situation in the power industry,Combined with information security requirements of the power industry, From the information security audit objectives, audit evidence, information security control framework, information security and other aspects of the audit...

Closed-loop active flow control in this paper is applied in S-shaped inlet to enhance engine intake quality for the sake of the inlet’s special structure. The pressure coefficient gradient is used to reflect the degree of controlling flow reattachment on the S-shaped inlet. A transfer function is established...

Vehicle electrical fires mostly are caused by the circuit fault, analyze the circuit molten marks by using the metallographic analysis to determine the circuit molten marks belongs to the primary or secondary molten marks is a important method for vehicle electrical fire authentication.

Electricity usage information collection system includes a master station system, communication channel and terminal devices. Among them, the master station system is the brain center of electricity information collection system which can achieve called measuring mechanism storage, calculation and analysis,...

In this letter, a compact dual band monopole antenna with circularly polarized ( CP ) property around 2.4 GHz and linearly polarized ( LP ) property around 1.57 GHz is presented. The antenna consists of a tree-shaped monopole antenna and a modified grounded plane. To realize CP characteristic, two orthogonal...

This paper briefly describes the defects of the ground collapse measurement technology at present and proposes a new method for measuring the ground collapse. The structure of the spiral parallel cable is illustrated and its circuit characteristics are deduced,it is concluded that the characteristic...

A RF radio signal acquisition and analysis system which is based on ARM and FPGA hardware architecture is designed in the paper. The system can measure the field strength data of multiple frequency radio signals at the same time, and save the demodulation broadcasting audio in real time. In addition,...

There is a kind of multi-channel automatic switch high precision low voltage switch. The conversion axis of low potential automatic change-over switch has public contact. The public contact and indexing plate’s each indexing position contact constitute the multi-channel change-over switch. Stepper motor...

The emergence of embedded technology brought a new technological revolution for the field of modern industrial numerical control. Based on the analysis of embedded technology and computer numerical control systems, this paper discussed the general structure model of embedded numerical control system,...

Fused deposition modeling (FDM) has brought great innovation for manufacturing because of its simple processing and forming rapidly, but the printing products created by this way are always found low-strength, deformed, cracked and so on. Aiming at these problems, there have been many researches on the...

The uncertainty of wind power, illustrates that the uncertainty of load and wind power have a great impact on the transmission network planning results. In order to obtain more stable and reasonable plan, the transmission network planning which considering the combined effect of wind power and load is...

This paper focuses on the fault tolerant control of quadrotor. In this paper, the dynamic model of quadrotor and its measurements model will be given, and a PID controller will be designed based on the models. Then we propose an approach to detect and diagnose the fault of rotor with the help of parameter...

This paper presents a 14-bit 2.5GS/s current-steering segmented DAC with a new technology of synchronization, called multi-clock synchronization, which is used to optimize the timing between the internal digital and analog domains. The quad-switch architecture is also adopted to mask the code-dependent...

The transmission of laser beams in dense medium like cumulus will produce multiple scattering phenomena. The results of multiple scattering not only weaken the laser energy, but also lead to the broadening of laser pulse in time domain. In this paper, the scattering parameters of cumulus were calculated...

The method which adopts the XMC1300 of infineon as the master control chip, using armored K type thermocouple temperature acquisition, after XMC1300 A/D conversion of the improved PID algorithm control source system of constant temperature;To improve the traditional low frequency resistance wire of electric...

Correctly selecting and reasonably arranging sensors are critical to high fidelity health assessment and low testing costs. A novel approach of sensor optimization placement for health monitoring based on fault detectability and trackability is proposed in this paper. Firstly, the requirements of sensor...

With the development of aerospace business and the popularization of automobile and yacht, navigation has been an important part of people’s life. And in the area of navigation, obtaining of yaw angle appears especially important. This paper designed a electronic compass with angle compensation used...

For Geiger-mode avalanche photodiodes, a statistical method is advanced to establish the quantitative correlation between the controllability of structure parameters and the homogeneity of device properties. Setting many parameters fluctuating independently and simultaneously, the collective effect of...

Electromagnet, as the actuator of electro hydraulic control system, its performance directly affects the performance of the electro-hydraulic control system. This paper analyses the working principle of intrinsically safe electromagnet, determines the experimental program, and tests the characteristics...

We propose a new positioning system based on the received signal strength (RSS) fingerprinting approach. The RSSs of LEDs are influenced by some ambient parameters, such as radiation pattern, incidence angle, attenuation coefficient, multipath fading and so on. And these factors degrade the performance...

Based on the 3D modeling of closing machine by SolidWorks, the sealing process of button battery is mainly analyzed and comparative study on equal channel angular sealing concave film and the sealing step angle concave film are studied with the contact stress with battery with the change of time. In...

Power amplifier electronic equipment is an important component of aviation weapon system, and random vibration is a main factor result in structural failure. In order to fully understand dynamic characteristics of power amplifier electronic equipment, according to modal analysis theory, the theory of...

This paper discusses city single-cross road’s traffic light real-control. Considering the pedestrians and non-motor vehicles, we carry on the six phase fuzzy control. It present a method of current phase green light delay , set up the algorithm and 3D controller design method. It also set up the principle...

The traditional software development does not consider the concerns, which is can addressing security problem effectively. So how to find the problem is the standard consideration for security researchers. In the field of software security testing, there are four ways, Fuzzing, Dynamic Taint Analysis,...

Temperature measuring method is one of the key issues in the research of high speed motorized spindle of thermal characteristics.In this paper, a new hybrid temperature measurement method is proposed, which is based on the contacted temperature measurement and infrared temperature measurement experiments,...

A high energy resolution X-ray spectrometer based on Silicon Drift Detector is described in this paper. The spectrometer consists of the SDD detector module, the analog electronics for shaping and filtering and the digital electronics for peak detection and data transfer. The system can working at room...

IETM authoring system is the important instrument to make IETM. Studying its indicator system helps choosing them. This paper introduces overviews of the indication system, then combining several weighting methods, achieves quantitating weights of functions and performance indicators of IETM authoring...

Nanonetworks is a communication between nanodevices, called nanomachines. Nanomachines are very small devices at the range of 10-9 metre. Molecular communication is one of the types of nanonetworks in which nanomachines are able to sense, calculate, actuate and intercommunicate. Transmission, propagation...

This paper presents a design of analog front-end of passive RFID tags for ISO/IEC 14443 and 15693 by using SMIC 0.18 m 2P4M CMOS process. In order to have better performance, three rectifiers have been designed and compared, LDO and low-pass filter have been designed to obtain a high PSRR and a large...

In this paper, a chopped charge pump with matching up and down pulses was introduced. The proposed topology is based on differential current sources and sinks. a switching circuit for switching on in a first phase one current source of each pair to provide up current pulses, and switching on in a second...

To meet the high requirements of 4G mobile communication systems, such as broadband, wide beamwidth and high gain, an improved microstrip antenna array fed by L-probe is proposed. Generally, most of the 4G antenna array elements have wide band and a gain of 3-5dBi. But the beamwidth in the horizontal...

With the popularization and development of mobile Internet and smart mobile terminals, the WeChat public number which combines traditional services and mobile internet application has become the development require of power information systems, research for the security of WeChat public number of power...

Affected by various factors, the result of shunt capacitor of breaker dielectric loss measurement is easily misjudged. In order to avoid misjudgment, this paper analyzes the common three kinds of influence factors: interference signals in the site, Cardon effect and air humidity. Three methods were proposed...

A LVDS receiver and driver for LVDS repeater are introduced, which can buffer LVDS one channel to four. As a result, the repeater can speeds up to 633Mbps.It is useful in long distance transmission to reduce signal attenuation.