The Stimulated Raman Scatting (SRS) sometimes plays a negative role in a fibre OPO ring cavity, which may consume the signal laser power. We established a mathematical model for describing the SRS process in the OPO cavity. A SRS threshold is presented. The SRS net effective gain should be smaller than...

With the widely application and development of the mechanical system and optical microcavity, the strong coupling between mirror and cavityfield in the system of cavity optomechanics that make the optomechanical system become an important platform which is used to inspect macroscopic quantum phenomena...

This paper reviews the development of ship wave-enduarability theory and summarizes its application in shipbuilding in the past half century, studies four aspects about wave-enduarability application in navigation technology: route optimization design, intelligent ship driving, non-standard heavy cargo...

Using simulation satellite tool kit STK, combining with foreign technical experience of global navigation system and technical data released by Big Dipper navigation system at present, the paper makes simulation and analysis in detail on Big Dipper navigation system's satellite constellation design,...

This paper is based on the effect that VHDL language on FPGA design and development, and we design the DDS module of FPGA by using the methods of designing. By research and analyse the The design of DDS module based on FPGA, we learn more about FPGA, visually and concretely. Also, We put forward the...

RFID (Radio Frequency IDentification) is a generic term for technologies that use radio signals to automatically identify objects in the IoT (Internet of Things). NFC (Near Field Communication) originating from RFID is a wireless peer-to-peer communication technology, which is widely applied to mobile...

As a system which can realize multifunction, integrated electronic information system, in the current framework of information war, puts up enriching and important neural support against other system. This article studies in detail corresponding key technologies in the development process of integrated...

Because RFID events contain features of real-time and mass resistance, there are some issues through the existing complex event detection method for processing, such as inefficient speed and taking up larger memory space. To solve these problems, a complex event detection method based on binary tree...

To analyze harmonic and interharmonic accurately is very important for power system. In this paper, a novel time-frequency analysis method ,namely SST(synchrosqueezing wavelet transform) ,is applied to detect harmonic and interharmonic. Firstly, the SST algorithm is used to extract a series of intrinsic...

Augmented reality technology is to expand the virtual reality technology. It can make virtual objects and real scene closely integrated. It can enhance the user's understanding of the real environment. Illumination consistency is an important aspect of the fuse of virtual objects and real scene. In order...

Taking the three-phase permanent magnet synchronous motor (PMSM) applied in ship electric propulsion system as an example, this paper discusses the mathematical model of the PMSM and the vector control principle and describes the algorithm of the space vector pulse width modulation (SVPWM). Finally,...

This article designs a insulation dielectric loss detecting instrument based on MSP430F1331 single chip microcomputer, which is a research on tg value detection of dielectric oil and insulating sleeve. The research shows the application of the new information collection terminal and new algorithm and...

It is important to develop the micro-electro-mechanical system (MEMS) fabrication technology based on polymers. Liquid crystal polymer (LCP) is a suitable substrate for fabricating the flexible MEMS array antenna applied to conforming and bending conditions. This paper presents the metallization process...

An all fiber-optic temperature sensor based on the temperature dependence of radiation-induced attenuation (RIA) of Ge/P co-doped optical fiber at 850 nm was proposed. The principle of the sensor was interpreted by the temperature dependence of color center absorption. Characteristics of the temperature...

The presence of H2S ( hydrogen sulphide ) gas in oil and gas exploration can give rise to critical safety problems because of its corrosivity and toxicity. In order to protect people and equipment, there is a need for a real-time,remote and reliable seneor that can detcet the concentration of H2S gas....

A kind of high-voltage inverter power supply for electron beam precision micro machining equipment is introduced. The system is based on the current transformation way of AC DC AC AC DC. Its intermediate inverter link is intermediate frequency inverter which is composed of two phase parallel half-bridge...

Tuning of surface plasmons is important for developing nanophotonic devices. Coaxial apertures are emerging candidates for manipulating surface plasmon polaritons in the visible range. In this work, we show fine tuning of plasmons in coaxial nanoapertures. Since high transmittance can be achieved through...

With the development of community detection algorithm, traditional clustering methods are hardly capable enough to meet our needs. This paper proposes a new algorithm based on spectral method that can identify the overlapping and hierarchical communities in complex networks. Experiments on artificial...

In this paper, a novel symmetrical split-ring resonators defected ground structure (DGS) wideband bandpass filter is proposed. This filter exhibits advantages such as miniaturization, large range of bandwidth and easy fabrication. This paper analyzes the symmetrical split-ring resonators DGS unit and...

The establishment of new generation of high efficiency video coding (HEVC) standard has been completed. There are many achievements for the research on HEVC coding efficiency, but there are few researches on HEVC based error concealment. In this paper, the packet loss of the simulation channel transmission...

A low power, high dc gain, high speed and large swing operational transconductance amplifier (OTA) is proposed. The OTA achieve 104dB dc gain and 3.65GHz gain bandwidth product (GBW) and only dissipates 38mW under 1.8V power supply. It is fabricated in 0.18um CMOS process and occupies 0.146mm2. It is...

Waveplates are among the most commonly used devices for altering the polarization state of light, and have been widely applied in polarization analysis of high-numerical-aperture (high-NA) imaging systems such as polarizing microscopes and immersion lithographers. As the NA of an optical system is increased,...

Using IR-UWB technique to TT&C system can greatly improve the anti-interference performance of TT&C signal. Aiming at the IR-UWB signal using in TT&C system, its BER performance in single-tone interference is analyzed. At the same time, the effect on the anti-interference performance of each parameter...

The response to axial strain of a hollow core photonic band gap fiber(HC-PBF) is investigated. The fiber is designed to operate at 1550nm which have shown to be highly dependent on the exact fiber structure. The relationship between axial strain and confinement loss as well as refractive index is calculated...

Derivative peaking phenomena appears in the initial stage when the initial value error between the classical extended state observer (ESO) and system state variables is bigger. A general form of extended state observer with nonlinear hyperbolic sine function is provided. The stability of a second-order...

Aiming at the strict requirement of pointing stability and dynamic environment of optical spacecrafts with micro vibrations in reaction flying wheels or other attitude actuators, this paper presents a passive double-layer micro-vibration control concept. The proposed micro-vibration system comprises...

In the paper, an advanced Gauss pseudospectral method (AGPM) is proposed to estimate the parameters of the continuous-time (CT) Hammerstein model consisting of a CT linear block followed by a static nonlinearity. The basic idea of AGPM is to transcribe the CT identification problem into a discrete nonlinear...

This paper mainly introduces color images interpolation algorithm which based on bayer template. In order to estimate the missing two components in one pixel accurately, this algorithm selects gradient correlation between pixels to calculate them. The bayer image, whose resolution ratio is 5120*3840,...

In this study, a P300 visual spelling system was presented using a novel method to input Chinese sinograms developed on a Hanyu Pinyin-based method. This method transcribes a Chinese pinyin into an initial consonant and vowel component according to its mandarin pronunciation. In this paradigm, each sinogram...

In the vehicle energy management and battery management system, the parameter monitoring system of the battery is the important basis to ensure its operation. The new observation system for state of battery is designed according to the principle of storage battery and its charge and discharge characteristics....