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Beamforming analysis based on CSB sin-FDA

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Journal of Systems Engineering and Electronics 2020年第1期31卷 73-84页

作者： WANG bo xie Junwei ZHANG Jing ZHANG Haowei Air and Missile Defense College Air Force Engineering UniversityXi’an 710051China Highway Railway College Shaanxi Vocational and Technical College of TransportXi’an 710018China

This paper studies the adaptive beamforming algorithm based on the frequency diverse array(FDA)array where the interference is located at the same angle(but different range)with the *** take the cross subarray-based FDA with sinusoidal frequency offset(CSB sin-FDA)as the receiving array instead of the basic *** sampling covariance matrix under insufficient snapshot can be corrected by the automatic diagonal loading *** the basis of decomposing the mismatched steering vector error into a vertical component and a parallel one,this paper searches the vertical component of the error by the quadratic constraint *** numerical simulation verifies that the beamformer based on the CSB sin-FDA can effectively hold the mainlobe at the target position when the snapshot is insufficient or the steering vector is mismatched.

关键词： receiving processing architectures minimum variance distortionless response(MVDR)beamformer cross subarraybased frequency diverse array with sinusoidal frequency offset(CSB sin-FDA) steering vector snapshots

Dot-shaped beamforming analysis based on OSB log-FDA

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Journal of Systems Engineering and Electronics 2020年第2期31卷 312-320页

The range and angle information of the frequency diverse array(FDA) cannot be exclusively determined at the output of the array because of the range-angle coupled transmit beampattern. The best decoupling approach is to form a dot-shaped beampattern rather than the S-shaped beampattern of the basic *** the degradation of the output signal-to-interferenceplus-noise ratio(SINR) caused by the coupled beampattern, we propose a dot-shaped beamforming method based on the analyzed overlapping subarray-based using a logarithmic offset and a subarray-based planar FDA using a logarithmically increasing frequency offset, with elements transmitting at multiple frequencies. Several simulation results demonstrate the effectiveness of the proposed method in transmit energy focusing, sidelobe suppression and array resolution.

关键词： subarray-based frequency diverse array(SB FDA) planar frequency diverse array(PFDA) decoupling dot-shaped beamforming

Physical simulation of mixing on a C-H2 smelting reduction reactor with different tracer feeding positions

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Journal of Iron and Steel Research International 2020年第9期27卷 1018-1034页

作者： Jin-yin xie bo Wang Jie-yu Zhang State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200072China

With the growing demand for energy saving,emission reduction,and green metallurgy,we had designed a new C-H2 smelting reduction *** order to solve the key problem that the heat transfer efficiency from high temperature oxidation zone in upper region to low temperature reduction zone in lower region is low in traditional metallurgical reduction reactor,a water simulation was adopted to optimize the mean residence time and to improve the transmission efficiency within the *** to the modified Froude similarity,a water model experimental reactor with a ratio of 1:1 to the prototype was *** the prototype,the feed port was used to feed preheated ore and *** order to simulate the effect of different feeding positions of the tracer on the mixing behavior in the molten pool,four points of tracer feeding position were arranged for a systematic *** the same time,based on double-row side nozzle with thick slag layer in a C-H2 smelting reduction reactor,nine influencing factors,including relative angle between upper and lower side nozzles,were *** experimental results showed that the tracer feeding position had a great influence on the mean residence time,and the relative angle also had a great influence on tracer feeding ***,through comprehensive analysis,the optimal condition parameters were obtained under different tracer feeding *** results provide valuable help for the design and optimization of the C-H2 smelting reduction reactor.

关键词： Smelting reduction reactor Tracer feeding position Double-row side blowing Mean residence time Relative angle Horizontal angle Vertical angle

A Note on Discrete Connections on Regular Lattice

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Communications in Theoretical Physics 2008年第6期49卷 1607-1610页

作者： xie Zheng LI Hong-bo Key Laboratory of Mathematics Mechanization Academy of Mathematics and System Science the Chinese Academy ofSciences Beijing 100080 China

Applying the systematic method about how to get the discrete counterparts of continuous system given by K. Wu et al., we define the discrete analogue of Ehresmann connections, Cartan connections, and affine connection... 详细信息

关键词： discrete connections discrete curvature plaquette variable noncommutative calculus

Plasma spray coating on interconnector toward promoted solid oxide fuel cells and solid oxide electrolysis cells

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Frontiers in Energy 2024年第3期18卷 390-398页

作者： Junwen CAO yun ZHENG Wenqiang ZHANG bo YU Institute of Nuclear and New Energy Technology(INET) Collaborative Innovation Center of Advanced Nuclear Energy TechnologyTsinghua UniversityBeijing 100084China Department of Chemical Engineering University of WaterlooWaterlooOntario N2L 3G1Canada Institute of New Energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China

Interconnector is a critical component to construct solid oxide cells (SOCs) stack. Oxidation of metallic interconnectors and Cr poisoning caused by oxidation are important factors that lead to long-term performance degradation of SOCs. Coating on the interconnector surface is an important approach to inhibit the oxidation and Cr migration of the interconnector. Herein, (La0.75Sr0.25)0.95MnO3–δ (LSM) and Mn1.5Co1.5O4 (MCO) are used to fabricate the coatings of interconnector. Two advanced thermal spray technology, atmospheric plasma spraying (APS) and low-pressure plasma spray (LPPS), are adopted for the coating preparation. The electrochemical performance, rising and cooling cycle stability, and Cr diffusion inhibition performance of the coatings are tested and evaluated. The result indicates that MCO can generate more uniform and denser coatings than LSM. In addition, MCO coatings prepared by LPPS shows the best electrochemical performance, rising and cooling cycle stability, and Cr diffusion inhibition. The initial area specific resistance (ASR) is 0.0027 Ω·cm2 at 800 °C. After 4 cooling cycle tests, the ASR increases to 0.0032 Ω·cm2 but lower than other samples. Meanwhile, the relative intense of Cr at the interface of SUS430 with MCO coatings fabricated by LPPS is lower than that of MCO fabricated by APS after 4 rising and cooling cycle operations, showing more favorable Cr diffusion inhibition performance.

关键词： interconnector coating plasma spray electrochemical performance Cr diffusion inhibition solid oxide cells(SOCs)

Adsorption of Carbon Dioxide on Activated Carbon

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Journal of Natural Gas Chemistry 2006年第3期15卷 223-229页

作者： bo Guo Liping Chang Kechang xie Key Laboratory of Coal Science and Technology Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan 030024 China College of Environmental Science and Engineering Taiyuan University of Technology Taiyuan 030024 China

The adsorption of CO2 on a raw activated carbon A and three modified activated carbon samples B, C, and D at temperatures ranging from 303 to 333 K and the thermodynamics of adsorption have been investigated using a vacuum adsorption apparatus in order to obtain more information about the effect of CO2 on removal of organic sulfur-containing compounds in industrial gases. The active ingredients impregnated in the carbon samples show significant influence on the adsorption for CO2 and its volumes adsorbed on modified carbon samples B, C, and D are all larger than that on the raw carbon sample A. On the other hand, the physical parameters such as surface area, pore volume, and micropore volume of carbon samples show no influence on the adsorbed amount of CO2. The Dubinin-Radushkevich （D-R） equation was the best model for fitting the adsorption data on carbon samples A and B, while the Freundlich equation was the best fit for the adsorption on carbon samples C and D. The isosteric heats of adsorption on carbon samples A, B, C, and D derived from the adsorption isotherms using the Clapeyron equation decreased slightly increasing surface loading. The heat of adsorption lay between 10.5 and 28.4 kJ/mol, with the carbon sample D having the highest value at all surface coverages that were studied. The observed entropy change associated with the adsorption for the carbon samples A, B, and C （above the surface coverage of 7 ml/g） was lower than the theoretical value for mobile adsorption. However, it was higher than the theoretical value for mobile adsorption but lower than the theoretical value for localized adsorption for carbon sample D.

关键词： carbon dioxide adsorption heat of adsorption activated carbon

Mechanism of ultrasonic strengthening fluidity of low mature shale oil: A case study of the first member of Lucaogou Formation, western Jimusaer Sag, Northwest China

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Petroleum Science 2023年第6期20卷 3337-3347页

作者： bo-Yang Wang bo Liu yun-Fei Cui Zi-Long Wang Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development Ministry of EducationNortheast Petroleum UniversityDaqing163318HeilongjiangChina No.203 Exploration Team Jilin Bureau of Coalfield GeologySiping136000JilinChina

The low mature shale oil resources of Lucaogou Formation in Jimusar Sag have a great potential, but the heavy oil quality limits large-scale economic development significantly. Ultrasonic is a typical representative of heavy oil viscosity reduction and anhydrous fracturing technology, and how to understand the action characteristics and mechanism of ultrasonic effect on reservoir is a critical issue to enhance shale oil production in the industrialized application of power ultrasonic. Therefore, the comparative experiments with different time of power ultrasonic loading were conducted to analyze the response mechanism of reservoir characteristics and the change of fluid mobility. The results indicate that the ultrasonic treatment is ameliorative to the pore-fracture structure, and the improvement degree is controlled by the mechanical vibration and cavitation of ultrasound. Generally, the location with weak cementation strength or relatively developed microcrack is preferred to pore expansion. After the ultrasonic treatment, the shale oil quality becomes lighter, and the transformation of shale oil from adsorbed to free, is accelerated due to enhanced fluidity. Pore-expanding effect and fluid mobility enhancement are essential aspects of the power ultrasonic loading to improve the recovery of low mature shale oil. The results of this study support the feasibility analysis of ultrasonic enhanced shale oil exploitation theoretically.

关键词： Ultrasonic Shale oil Reservoir properties Mobility Recovery

DPTM simulation of aeolian sand ripple

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Science China(Physics,Mechanics & Astronomy) 2008年第3期51卷 328-336页

作者： ZHENG XiaoJing bo TianLi xie Li Key Laboratory of Mechanics on Western Disaster and Environment Lanzhou UniversityLanzhou 730000China

Aeolian sand ripple and its time evolution are simulated by the discrete particle tracing method (DPTM) presented in this paper. The difference between this method and the current methods is that the former can consider the three main factors relevant to the formation of natural aeolian sand ripples,which are the wind-blown sand flux above the sand bed formed by lots of sand particles with different di-ameters,the particle-bed collision and after it the rebound and ejection of sand particles in the sand bed,the saltation of high-speed sand particles and the creep of low-speed sand particles,respectively. The simulated aeolian sand ripple is close to the natural sand ripple not only in basic shape and characteristic,particle size segregation and stratigraphy,but also in formation stages. In addition,three important speeds can be obtained by this method,which are the propagation speed of the saturated aeolian sand ripple and the critical frictional wind speeds of emergence and disappearance of sand ripple.

关键词： wind-blown sand flux aeolian sand ripple discrete particle tracing method (DPTM) mixed-particle-size creep

Capture Probe: a java tool for designing probes for capture Hi-C applications

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Zoological Research 2020年第1期41卷 94-96页

作者： yun-Fei Ma Adeniyi CAdeola Yan-bo Sun Hai-Bing xie Ya-Ping Zhang State Key Laboratory of Genetic Resources and Evolution and Yunnan Laboratory of Molecular Biology of Domestic AnimalsKunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650223China Kunming College of Life Science University of Chinese Academy of SciencesKunmingYunnan 650204China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory for Conservation and Utilization of Bio-resource and Key Laboratory for Animal Genetic Diversity and Evolution of High Education in Yunnan ProvinceYunnan UniversityKunmingYunnan 650091China

DEAR EDITOR,Many functional elements associated with traits and diseases are located in non-coding regions and act on distant target genes via chromatin looping and folding,making it difficult for scientists to reveal the genetic regulatory *** Hi-C is a newly developed chromosome conformation capture technology based on hybridization capture between probes and target genomic *** can identify interactions among target loci and all other loci in a genome with low cost and high ***,we developed CaptureProbe,a user-friendly,graphical Java tool for the design of capture probes across a range of target sites or *** parameters helped to achieve and optimize the designed *** testing of CaptureProbe showed high efficiency in the design success ratio of target loci and probe ***,this program will help scientists conduct genome spatial interaction research.

关键词： Capture EDIT Probe