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mutual information of cylinder pressure and combustion phase estimation in spark ignition engines

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Control Theory and Technology 2020年第1期18卷 34-42页

作者： Huanyu DI Tielong SHEN Department of Engineering and Applied Sciences Sophia UniversityTokyo 102-8554Japan

For the study of internal combustion engines,combustion control is an important method to achieve high efficiency and low ***,in-cylinder pressure sensor-based closed-loop control strategies have become the preferred ***,their productional application in automotive industries is limited due to the cost of intensive pressure acquisition for a whole cycle and the calculation load of combustion phase *** paper proposes a method of combustion phase estimation for spark ignition(SI)*** this method,the combustion phase is estimated only based on pressure measurements at several crank *** entropy and mutual information are introduced to analyze the feasibility and accuracy of the combustion phase estimation,which shows that the pressure measurements at selected points contain most of the information for the *** a result,only pressure measurements at 3 points and ELM estimation models are required to obtain the combustion phase,instead of intensive data acquisition and calculation.

关键词： Information entropy mutual information combustion phase estimation in-cylinder pressure extreme learning machine

Non-isothermal thermogravimetric investigation on mutual effect between bituminite and anthracite in blends for blast furnace injection

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Journal of Iron and Steel Research International 2019年第8期26卷 818-828页

作者： Yun-fei Wu Qing-hai Pang Zhi-jun He Teng-fei Song Wen-long Zhan Jun-hong Zhang School of Materials and Metallurgy University of Science and Technology Liaoning Anshan 114051 Liaoning China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

In order to clarify the mutual effect between bituminite and anthracite in blends during industrial combustion, the influence of particle size and heating rate as well as oxygen concentration in atmosphere was analyzed. The results of non-isothermal thermogravimetric analysis indicated that the combustion behavior of blends was of great difference though blends were prepared with the same volatile content of 20%. The catalysis of bituminite to anthracite changed with the thermal and kinetic condition of combustion reaction, and consequently, blends with different collocations were suitable for various combustion environments. Superior combustion properties of some blends were achieved at high heating rates, while others might react faster under high oxygen-enriched atmosphere. Simultaneously, the volume model and unreacted core model as well as random pore model were introduced to fit the experimental data. The kinetic calculation results showed that the combustion of blends at different heating rates all agreed better with that of random pore model in comparison with the other two models, while the apparent activation energy of samples all decreased with the increase in heating rate. The similarity of functional group structure between bituminite and anthracite is closely related to the accordance in com-bustion stage of bituminite and anthracite in blends.

关键词： Pulverized coal injection Coal blend mutual effect Kinetics Activation energy Bituminite Anthracite

mutual Neutralization of Na^(+)/O^(-) Ions in Slow Collisions

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Chinese Physics Letters 1996年第2期13卷 93-96页

作者： ZHOU Xiao-xin DONG Chen-zhong Department of Physics Northwest Normal UniversityLanzhou 730070

The mutual neutralization cross sections of Na^(+)/O^(-) ions at low energy have been calculated by using the multichannel LandaZener *** asymptotic method is used for estimating tBe coupling matrix elements between tbe ionic and covalent states at the crossing points of diabatic potential *** results of calculation are compared with available experimental data.

关键词： theory. mutual asymptotic

Fault monitoring based on mutual information feature engineering modeling in chemical process

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Chinese Journal of Chemical Engineering 2019年第10期27卷 2491-2497页

作者： Wende Tian Yujia Ren Yuxi Dong Shaoguang Wang Lingzhen Bu College of Chemical Engineering Qingdao University of Science&TechnologyQingdao 266042China

A large amount of information is frequently encountered when characterizing the sample model in chemical process.A fault diagnosis method based on dynamic modeling of feature engineering is proposed to effectively remove the nonlinear correlation redundancy of chemical process in this *** the whole process point of view,the method makes use of the characteristic of mutual information to select the optimal variable *** extracts the correlation among variables in the whitening process without limiting to only linear ***,PCA(Principal Component Analysis)dimension reduction is used to extract feature subset before fault *** application results of the TE(Tennessee Eastman)simulation process show that the dynamic modeling process of MIFE(mutual Information Feature Engineering)can accurately extract the nonlinear correlation relationship among process variables and can effectively reduce the dimension of feature detection in process monitoring.

关键词： Big data Fault diagnosis mutual information TE process Process modeling

Semi-supervised Counting of Grape Berries in the Field Based on Density mutual Exclusion

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Plant Phenomics 2023年第4期5卷 825-835页

作者： Yanan Li Yuling Tang Yifei Liu Dingrun Zheng School of Computer Science and Engineering School of Artificial IntelligenceWuhan Institute of TechnologyWuhan 430205China Hubei Key Laboratory of Intelligent Robot Wuhan Institute of TechnologyWuhan 430073China

Automated counting of grape berries has become one of the most important tasks in grape yield ***,dense distribution of berries and the severe occlusion between berries bring great challenges to counting algorithm based on deep *** collection of data required for model training is also a tedious and expensive *** address these issues and cost-effectively count grape berries,a semi-supervised counting of grape berries in the field based on density mutual exclusion(CDMENet)is *** algorithm uses VGG16 as the backbone to extract image *** tasks based on density mutual exclusion are *** tasks exploit the spatial distribution pattern of grape berries in density levels to make full use of unlabeled *** addition,a density difference loss is *** feature representation is enhanced by amplifying the difference of features between different density *** experimental results on the field grape berry dataset show that CDMENet achieves less counting *** with the state of the arts,coefficient of determination(R^(2))is improved by 6.10%,and mean absolute error and root mean square error are reduced by 49.36%and 54.08%,*** code is available at.

关键词： Grape mutual backbone

Optical generation of tunable and narrow linewidth radio frequency signal based on mutual locking between integrated semiconductor lasers

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Photonics Research 2014年第4期2卷 11-17页

作者： Ning Zhang Xinlun Cai Siyuan Yu Department of Electrical and Electronic Engineering University of BristolBristol BS81UBUK State Key Laboratory of Optoelectronic Materials and Technology School of Physical Science and Engineering TechnologiesSun Yat-sen UniversityGuangzhou 510275China

An integrated on-chip optical device consisting of two distributed feedback(DFB)lasers and one multimode semiconductor ring laser(SRL)has been numerically *** this optical circuit,the two DFB lasers are injected into the SRL,and with the presence of the four-wave mixing effect and optical feedback,the three semiconductor lasers achieve mutual-locking *** beating between the output optical spectral lines can generate readily tunable radio frequency signals with high spectral purity.

关键词： tunable mutual locking

Quantization and Squeezed State of Two L-C Circuits with mutual-Inductance

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Chinese Physics Letters 1998年第9期15卷 625-627页

作者： FAN Hong-yi PAN Xiao-yin Department of Material Science and Engineering University of Science and Technology of ChinaHefei 230026

It is pointed out that the quantum mechanical Hamiltonian of two L-C circuits with mutual-inductance is equivalent to a pair of harmonic oscillators with a kinetic coupling *** then diagonalize the *** is shown that instantaneously switching on the external sources may result in a two-mode squeezed state of the system,which actually arises from the effect of *** quantum fluctuation for the case of l_(1)c_(1)=l_(2)c_(2 ) is analysed and it is found that the current fluctuation in the circuits increases with the increment of the mutual-inductance.

关键词： mutual quantum diagonal

Two-frequency mutual coherence function and its applications to pulse scattering by random rough surface

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Science China(Physics,Mechanics & Astronomy) 2008年第2期51卷 157-164页

作者： REN YuChao GUO LiXin School of Science Xidian UniversityXi’an 710071China

An analytic expression of the two-frequency mutual coherence function (MCF) was derived for a two-dimensional random rough surface. The scattered field was cal-culated by the Kirchhoff approximation, which is valid in the case that the radius of curvature of the surface is much larger than the incident wave length. The scatter-ing problem of narrowband pulse was investigated to simplify the analytic expres-sion of the two-frequency MCF. Numerical simulations show that the two-frequency MCF is greatly dependent on the root-mean-square (RMS) height, while less de-pendent on the correlation length. The analytic solutions were compared with the results of Monte Carlo simulation to assess the accuracy and computational efficiency.

关键词： mutual coherence function pulse scattering random rough surface

A Novel Beam Design Method for mm Wave Multi-Antenna Arrays with mutual Coupling Reduction

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China Communications 2019年第10期16卷 37-44页

作者： Weizhi Zhong Lei Xu Qiuming Zhu Xiaomin Chen Jianjiang Zhou College of Astronautics Nanjing University of Aeronautics and AstronauticsNanjing 210016China College of Electronic and Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

To overcome the mutual coupling (MC) of multiple antennas in millimeter wave (mmWave) communication systems, a novel beam design method with low complexity is proposed in this paper. Firstly, an equivalent channel model incorporating the effect of MC is analyzed and established, and then an optimal precoding / combiner vector for beamforming is derived. On this basis, by using greedy geometric (GG) algorithm, a novel hybrid beam design method is proposed. Finally, the performance of proposed method is analyzed and compared with other traditional ones. The simulation results show that the proposed method has better suppression of the MC effect as well as lower complexity.

关键词： millimeter wave (mmWave) antenna array beam design mutual coupling (MC) greedy geometric (GG) algorithm