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The occurrence of 5-hydroxymethylfurfural, furan and nitrite in commercial soy sauce from the Chinese

AIP Conference Proceedings 2019年第1期2110卷

作者： Wei Qi Yanzhou Bao Xiaoxue Li Yaohua Guo Nan Wang Xuegang Luo 1Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science & Technology) Ministry of Education Tianjin 300457 P.R. China 2National Engineering Laboratory for Industrial Enzymes (Tianjin University of Science & Technology) Tianjin 300457 P.R. China 3Tianjin Engineering Research Center of Microbial Metabolism and Fermentation Process Control (Tianjin University of Science & Technology) Tianjin 300457 P.R. China 4College of Biotechnology Tianjin University of Science & Technology Tianjin 300457 P.R. China

To investigate the possibly carcinogenic substance occurring in soy sauce, the furan, 5-hydroxymethylfurfural (HMF) and nitrite, as well as chemical properties, such as total titratable acid, reducing sugars, ethanol, amino nitrogen and total nitrogen, analysis in sixteen commercial soy sauce from the China market were determined using chromatography-mass spectrometry method. There were considerable variations in furan, HMF and nitrite concentrations of different commercial soy sauces. The results showed that the level of furan and 5-hydroxymethylfurfural of the soy sauce studied ranges from15.36 to 119.82 µg/kg and 0.21 to 4.27 mg/kg, respectively, whereas the content of nitrite ranges from 0.04 to 0.73 mg/kg. The results indicated that the level of nitrogen and glucose may have a relationship with formation of furan, 5-HMF and nitrite in soy sauce. It was observed that soy sauce may be an important source of contamination by furan, HMF and nitrite.

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A 620-690 GHz Sub-Harmonic Mixer Based on Monolithic GaAs integrated Schottky Diodes

A 620-690 GHz Sub-Harmonic Mixer Based on Monolithic GaAs In...

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International Applied Computational Electromagnetics Society Symposium in China

作者： Dong Feng Ji Bo Zhang Lisen Zhang Dong Xing Yong Fan EHF Key Laboratory of Science University of Electronic Science and Technology of China National Key Laboratory of Application Specific Integrated Circuit Hebei Semiconductor Research Institute

ISBN: (纸本)9781509043118

In this paper, a 620-690GHz sub-harmonic mixer using monolithic GaAs integrated schottky diodes is presented in order to remove the mismatch caused by manual assembly of the flip chip diode. The monolithic microwave integrated circuit integrates a Schottky anti-parallel diodes pair in a longitudinal configuration. We mostly analyzed the influence caused by diode position offset and conductive adhesive thickness on the performance of the mixer, which shows the necessity of monolithic integration technology. In 620GHz to 690 GHz simulated results of the mixer had achieved less than 9dB of conversion loss and 920K for DSB noise temperature within the bandwidth.

关键词： Terahertz Monolithic GaAs integrated Schottky diodes Mixer Schottky diodes Mixer terahertz Flip-chip devices sub-harmonic conversion loss diodes Monolithic microwave integrated circuits

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An Error-Entropy Minimization Algorithm for Tracking control of Nonlinear Stochastic Systems with Non-Gaussian Variables

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IFAC-PapersOnLine 2017年第1期50卷 10407-10412页

作者： Liu Y. Wang A. Guo L. Wang H. State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang 110819 China Institute of Computer Sciences Anhui University Anhui China Science and Technology on Aircraft Control Laboratory Beihang University Beijing 100191 China Pacific Northwest National Laboratory 902 Battelle Blvd RichlandWA 99352 United States

This paper presents an error-entropy minimization tracking control algorithm for a class of dynamic stochastic systems. The system is represented by a set of time-varying discrete nonlinear equations with non-Gaussian stochastic input, where the statistical properties of stochastic input are unknown. By using Parzen windowing with Gaussian kernel to estimate the probability densities of errors, recursive algorithms are then proposed to design the controller such that the tracking error can be minimized. The performance of the error-entropy minimization is compared with the mean-square-error minimization in the simulation results. © 2017

关键词： information potential Minimum error entropy non-Gaussian variables probability density function stochastic systems

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A Schottky Diodes Based W-band 4th-Harmonic Mixer

A Schottky Diodes Based W-band 4th-Harmonic Mixer

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International Applied Computational Electromagnetics Society Symposium in China

作者： Yang Liu Bo Zhang Lisen Zhang Yong Fan EFH Key Laboratory of Science University of Electronic Science and Technology of China National Key Laboratory of Application Specific Integrated Circuit Hebei Semiconductor Research Institute

In this paper, a broadband fourth-harmonic mixer based on gallium arsenide (GaAs) Schottky barrier diodes working at 80-100GHz is designed. This fourth-harmonic mixer is simulated and attains low conversion loss below... 详细信息

ISBN: (纸本)9781509043118

关键词： Mixers Schottky diodes integrated circuit modeling Ports (Computers) Simulation Harmonic analysis

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Emergency control strategy of hybrid power system under sudden load applying

Emergency control strategy of hybrid power system under sudd...

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Annual Conference of Industrial Electronics Society

作者： Xueyan Zhang Lijun Fu Fan Ma National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

The hybrid power system consisting of new energy inverters and diesel generators has become a typical case of independent power systems in remote areas. Aiming at the problem of generator overload caused by sudden load applying in such systems, this paper proposes a novel emergency control strategy which increases the inverter output power according to the changing rate of system frequency. This control strategy is based on the constant current control of inverters and voltage and rotate speed droop control of generators. And it effectively solves the generator overload problem and guarantees the continuous power supply for all the loads in the system. The control strategy is validated by time-domain electromagnetic transient simulations.

关键词： Generators Inverters Load modeling Hybrid power systems Power generation Frequency control Current control

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Modeling of electronic attenuator in adaptive interference cancellation systems

Modeling of electronic attenuator in adaptive interference c...

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IEEE International Symposium on Electromagnetic Compatibility (EMC-Beijing)

作者： Yang Li Fangmin He Jin Meng Yi Li Qing Wang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan Chnia

In the design of adaptive interference cancellation systems (AICSs), the simulation model plays an important role. Particularly, accurate modeling of the response of electronic attenuator is crucial but is usually a difficult task since it relies on the exact fitting of the response of real PIN diodes. In this paper, the PIN diode response characteristics are firstly measured with exprienment. Then, the key parameters of the model are extracted by fitting the experiment data with the output of the model. The feasibility of this approach is examined with three levels of experiments and simulations, i.e., the response of the PIN diode and the electronic attenuator, as well as the performance of the AICS. The results show that our proposed method is feasible and effective.

关键词： PIN photodiodes Attenuators integrated circuit modeling Voltage control Resistance Adaptation models Fitting

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Static and Dynamic Magnetic Properties of Ferromagnetic Cobalt Particles Containing Nanoscale Subunits

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Procedia Engineering 2017年 216卷 66-70页

作者： Wenxin Li Peiheng Zhou Xiaojia Luo Jianhua Hou Jiagen Jiang National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China

In this work, cobalt micro-particles containing various nanoscale subunits were hydro- thermally synthesized and controlled by the content of sodium tartrate in reaction solution. Both the static and dynamic magnetization properties of cobalt particles changes accordingly. As the content of sodium tartrate varies from 0 g, 0.552 g to 4.416 g, subunits of the cobalt particles shrinks from dendrites, coralloids to small bumps, saturation magnetization changes from 122.5 emu/g, 86.5 emu/g, to 95.79 emu/g, and the coercive force reduces from 195 Oe, 148 Oe, to 62 Oe. Consequently, ferromagnetic resonance bandwidth of the cobalt particles decreases due to the diminishing surface scatterers (subunits), whereas low frequency loss tangential increases following the growth of spherical particle core. The proposed cobalt particles with nanoscale subunits shows potential for electromagnetic wave absorption and shielding application.

关键词： hydro- thermal synthesis microwave permeability spectrum ferromagnetic metal particles magnetic loss tangential

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An overview of multi-antenna technologies for space-ground integrated networks

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science China Earth sciences 2016年第12期59卷 1-18页

作者： Lei GAO Shuo ZHANG Ziyao LIU Jinyong LIN Shuai WANG Chengwen XING National Key Laboratory of Science and Technology on Aerospace Intelligence Control Beijing 100854China Beijing Aerospace Automatic Control Institute Beijing 100854China School of Information Science and Electronics Beijing Institute of TechnologyBeijing 100081China

Multi-antenna technologies have already achieved a series of great successes in the development of information networks. For future space-ground integrated networks(SGINs), the traditional various kinds of separated information networks will converge to a whole fully connected information network to provide more flexible and reliable services on a world scale. Regarding their great successes in existing systems, multiantenna technologies will be of critical importance for the realization of SGINs and multi-antenna technologies are definitely one of the most important enabling technologies for future converged SGINs. In this article, a comprehensive overview on multi-antenna technologies is given. We first investigate multi-antenna technologies from a theoretical viewpoint. It is shown that we can understand multi-antenna technologies in a general and unified point of view. This fact has two-fold meanings. First, the research on multi-antennas can help us understand the relationships between different technologies e.g., OFDMA, CDMA, etc. On the other hand,multi-antenna technologies are easy to integrate into various information systems. Following that, we discuss in depth the potentials and challenges of the multi-antenna technologies on different platforms and in different applications case by case. More specifically, we investigate spaceborne multi-antenna technologies, airborne multi-antenna technologies, shipborne multi-antenna technologies, etc. Moreover, the combinations of multiantenna technologies with other advanced wireless technologies e.g., physical layer network coding, cooperative communication, etc., are also elaborated.

关键词： MIMO multi-antenna technologies signal processing space-ground integrated networks satellite networks terrestrial networks

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A manchester code communication protocol suitable for power electronics system

A manchester code communication protocol suitable for power ...

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Annual Conference of Industrial Electronics Society

作者： Qiang Ren Fei Xiao Sheng Ai Xiaoliang Hao National key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

To satisfy the requirements of complex distributed power electronic system (PES) communication, this paper has proposed a single optic-fiber link data communication protocol based on the Manchester code due to an vacancy in the commonly-adopted protocols, analyzed the encoding and decoding principle of Manchester code, defined the formats of command frame and data frame, calculated the communication time and error rate, and described the mechanism of fault identification and handing. All this leads to a distributed master-slave control structure suitable for high-power multiphase inverter and a point-to-point data communication mode. Experiments prove the protocol to be correct and feasible. The Manchester code communication protocol based on FPGA program is simple in the structure of hardware and software. When the system clock is 100MHz, the communication bandwidth can reach 40Mbps, which can meet the needs for communication of PES with kHz or 10kHz switching frequency.

关键词： Data communication Encoding Protocols Clocks control systems Decoding Receivers

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Minimum sliding mode error feedback control for inner-formation satellite system with J2 and small eccentricity

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science China(Information sciences) 2016年第7期59卷 214-231页

作者： Lu CAO Xiaoqian CHEN The State Key Laboratory of Astronautic Dynamics China Xi'an Satellite Control Center College of Aerospace Science and Engineering National University of Defense Technology

With the recent flurry of the research on Inner-Formation satellite system, there has been apparent need for a set of linearized equations to describe the relative motion of satellites under the effect of the Jgeopotential disturbance, which is the important perturbed-factor for low-orbit Inner-Formation system. Hence,on the assumption of small eccentricity, a new set of linearized equations of motion is proposed that accounts for Jperturbations in an elliptical orbit. To avoid the collision between the inner satellite and the outer satellite,the Minimum Sliding Mode Error Feedback control(MSMEFC) is developed to perform a real-time control on the outer satellite with the uncertain perturbations from the space. The highlight of MSMEFC is to introduce the concept of equivalent control error, which is the key utilization of MSMEFC. It is shown that the proposed MSMEFC can compensate any kinds of uncertain perturbations. Besides, in this paper, the relationship between the equivalent control error and uncertain perturbations is discussed. The robustness and steady-state error of MSMEFC are also analyzed to show its theoretical advantages compared with traditional SMC. Numerical simulations are employed to check the fidelity of the linearized equations. In addition, the efficacy of MSMEFC is verified by the utilization of Inner-Formation system with high control precision.

关键词： inner-formation gravity measurement minimum sliding mode error sliding mode control J2

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