The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We develop a comprehensive theoretical model for the maximum transmission eigenchannel and obtain a closed-form analytical expression relating its spatial profile to the shape of a disordered waveguide.
With an increase in acceptance of face recognition systems, the desire for accurate biometric authentication — face recognition, has increased. Nowadays, the fundamental limitations of existing systems are, the vulnerabilities of false verification via a picture or simple video of a person. In this paper, it is inspired by how humans can perform reliable spoofing detection only based on the available...
Spectroscopy is an important component analysis method and full spectrum prediction method may be complicated and inaccurate. In order to find out the irrelevant variables, a variable selection method based on the frequent pattern tree(FP-tree) is proposed in this paper. The proposed method firstly formulates an orthogonal array to generate wavelength selection plans, which makes the wavelength selection...
Lightning withstand level of the transmission line is directly affected by the value of the tower impulse grounding impedance. While it's difficult to obtain the tower impulse grounding impedance accurately as its nonlinearity under impulse current. Therefore the study of the tower impulse grounding impedance characteristics is significant to lightning protection. Reduced-scale experiment was used...
Comparing with the traditional grid, energy internet will collect data widely and connect more broader. The analysis of electrical data use of Non-intrusive Load Monitoring (NILM) can infer user behavior privacy. Consideration both data security and availability is a problem must be addressed. Due to its rigid and provable privacy guarantee, Differential Privacy has proverbially reached and applied...
In order to meet the demands of a UAV airborne transmitter local oscillator, a PLL frequency synthesizer based on ADF4350 is designed. The chip integrates a phase detector and a VCO, only a reference circuit, a low-pass filter, and a control circuit should be added to form a complete local oscillator. The result and practical application show that this local oscillator stable and reliable, compact,...
Using a wavelength division multiplexer, we increase the spectral bandwidth of a multimode-fiber-based spectrometer to 100nm with the spectral resolution of 0.03nm. An effective algorithm is developed to achieve fast, accurate reconstruction of diversified spectra.
Cilia are organelles that generate microfluidic flows in the lungs, central nervous system, and Fallopian tubes. Quantitative flow diagnostic remain immature. I will present a comprehensive optical imaging-based approach for quantifying cilia flow physiology.
We demonstrate a VECSEL-based degenerate laser with tunable spatial coherence. The low spatial coherence illumination is used for traditional high-speed video-microscopy and high spatial coherence illumination to extract dynamic information of blood flow in Xenopus.
We design and fabricate an on-chip spectrometer based on an evanescently-coupled multimode spiral waveguide. Evanescent coupling between waveguide arms greatly enhances the spectral resolution, reaching 10pm at wavelength 1520nm with a footprint of 500μ×500μ.
Ball mill pulverizing system (BMPS) is an important equipment in the thermal power plant and working conditions classification is the premise of realizing the control optimization. This paper proposes working conditions classification of ball mill pulverizing system based on quantum cat swarm optimization clustering algorithm. Firstly, this algorithm creates N cats, representing N kinds of data classifications...
With the expansion of the grid scale, short-circuit current is increasing, the safety of grid is seriously impacted by the short-circuit current. Therefore, a new technique of energy-saving transformer possessing variable impedance is proposed. This transformer combines the advantages of the high impedance transformer and fault current limiter, it can reduce the impact of short-circuit current and...
Terahertz wave generation based on optical rectification in GaP waveguide emitters with a femtosecond zeroth-order Bessel beam was reported. The non-diffracting nature of the Bessel beam enabled an enhancement of the THz output power by factors of 3.46 and 3.34 from GaP waveguides of 6 and 10 mm, respectively, compared with a Gaussian beam having the same beam size and pump power as the central spot...
Mobile Ad-hoc networks (MANETs) are self-organizing multi-hop wireless networks composed of independent mobile nodes. Due to the characteristics of dynamic topology and limited resources, MANETs are vulnerable to attacks from malicious nodes. However, traditional security policies with encryption and authentication cannot be well suited for MANETs, because of absence of trusted third party. In order...
A small sized, light weighted receiver local oscillator based on integrated PLL chip ADF4350 was designed to fit into airborne equipment of UAV datalink. Integrated with a phase detector and a voltage controlled oscillator, the phase-locked loop (PLL) frequency synthesizer was implemented by using an external loop filter, reference frequency and control circuit to meet the technical and size requirements...
Ventilation is an important parameter affecting the quality and the efficiency of ball mill pulverizing system. This paper proposed a nonlinear prediction model for ventilation. The proposed method adopted nonlinear partial least squares(PLS) with the back-propagation neural network(BPNN) as an inner function. First, PLS extracts the latent variables of the input and output to eliminate the collinearity,...
Using a wavelength division multiplexer, we increase the spectral bandwidth of a multimode-fiber-based spectrometer to 100nm with the spectral resolution of 0.03nm. An effective algorithm is developed to achieve fast, accurate reconstruction of diversified spectra.
We experimentally generate principal modes in a multimode fiber with strong mode coupling. They possess unique spectral and temporal properties. We reveal that principal modes are formed by multi-path interference effect, which is manipulated by the spatial degrees of freedom at the input.
Continuous sterilization is conducted on medium before fermentation to achieve destruction of microorganisms in the medium. In the process control of continuous sterilization, high control quality may not be obtained for there exist severe nonlinear property and system disturbances in the process. In this paper, a nonlinear model predictive controller based on the linguistic model is proposed. The...
By shaping the incident wavefront, we effectively control the polarization states of light propagating through a multimode fiber with strong polarization and mode mixing. We can either eliminate depolarization and restore the input polarization state, or convert the output fields into a different polarization state.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.