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Dynamics and formation of vortices collapsed from ring dark solitons in a two-dimensional spin–orbit coupled Bose–Einstein condensate

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Frontiers of physics 2022年第4期17卷 185-193页

作者： Peng-Hong Lu Xiao-fei Zhang Chao-qing Dai College of Optical Mechanical and Electrical EngineeringZhejiang A&F UniversityLin’an 311300China Department of Physics Shaanxi University of Science and TechnologyXi’an 710021China

We consider the dynamics and formation of vortices from ring dark solitons in a two-dimensional Bose–Einstein condensate with the Rashba spin–orbit coupling based on the time-dependent coupled Gross–Pitaevskii *** with previous results,the system exhibits complex dynamical behaviors in the presence of the spin–orbit *** the modulation of the spin–orbit coupling,not only the lifetime of ring dark solitons is greatly prolonged,but also their attenuation kinetics is significantly *** two shallow ring dark solitons with the equal strength of the spin–orbit coupling,the radius of ring dark solitons increases to a maximum value over time and then shrinks into a minimum *** to the effect of the snake instability,ring dark solitons split into a series of ring-like clusters of vortex pairs,which perform complex *** indicates that the system is strongly dependent on the presence of the spin–orbit ***,the effect of different initial modulation depths on the dynamics of ring dark solitons is investigated.

关键词： Bose–Einstein condensate Rashba spin–orbit coupling ring dark solitons vortex pairs

Identification of peanut oil origins based on Raman spectroscopy combined with multivariate data analysis methods

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Journal of Integrative Agriculture 2022年第9期21卷 2777-2785页

作者： ZHU Peng-fei YANG qing-li ZHAO Hai-yan College of Food Science and Engineering Qingdao Agricultural UniversityQingdao 26619P.R.China

This study aimed to use Raman spectroscopy to identify the producing areas of peanut oil and build a robust discriminant model to further screen out the characteristic spectra closely related to the origin. Raman spectra of 159 peanut oil samples from different provinces and different cities of the same province were collected. The obtained data were analyzed by stepwise linear discriminant analysis(SLDA), k-nearest neighbor analysis(k-NN),support vector machine(SVM) and multi-way analysis of variance. The results showed that the overall recognition rate of samples based on full spectra was higher than 90%. The producing origin, variety and their interaction influenced Raman spectra of peanut oil significantly, and 1 400–1 500 cmand 1 600– 1 700 cmwere selected as the characteristic spectra of origin and less affected by variety. The best classification model established by SLDA combined with characteristic spectra could rapidly and accurately identify peanut oil’s origin.

关键词： Raman spectroscopy peanut oil large-scale district small-scale district variety chemometrics

Control performance comparison between tuned liquid damper and tuned liquid column damper using real-time hybrid simulation

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Earthquake Engineering and Engineering Vibration 2019年第3期18卷 695-701页

作者： Zhu fei Wang jinting jin Feng Lu Liqiao State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China Changjiang Institute of Survey Planning Design and Research Wuhan 430010 China

Tuned liquid damper (TLD) and tuned liquid column damper (TLCD) are two types of passive control devices that are widely used in structural control. In this study, a real-time hybrid simulation (RTHS) technique is employed to investigate the diff erence in control performance between TLD and TLCD. A series of RTHSs is presented with the premise of the same liquid length, mass ratio, and structural parameters. Herein, TLD and TLCD are physically experimented, and controlled structures are numerically simulated. Then, parametric studies are performed to further evaluate the diff erent performance between TLD and TLCD. Experimental results demonstrate that TLD is more eff ective than TLCD under diff erent amplitude excitations.

关键词： tuned liquid damper tuned liquid column damper real-time hybrid simulation control effi ciency structural control parametric study

LotusMenu: a 3D menu using wrist and elbow rotation inspired by Chinese traditional symbol

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Science China(Information Sciences) 2021年第10期64卷 242-244页

作者： fei LYU Yujie LIU jin HUANG Zhaolin ZHANG School of Digital Media and Design Arts Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System and Network Culture Beijing University of Posts and Telecommunications State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences

Three-dimensional rotation, including pitching, yawing and rolling, is an important gesture in 3D interaction, with the potential to extend the selection capability in large screen interaction system. For 3D rotation interaction, researchers indicated the design space of pen tilt [1] and wrist tilt as input modality [2, 3]. However, the combination of freehand 3D rotation gesture has not been fully utilized for menu control.

关键词： Information Systems and Communication Service

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Application of Wood Char in Processing Oolitic High-phosphorus Hematite for Phosphorus Removal

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Journal of Iron and Steel Research International 2016年第2期23卷 109-115页

作者： Hui-qing TANG Yan-qi QIN Teng-fei QI Zhi-lei DONG qing-guo XUE State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

Phosphorus removal from oolitic high-phosphorus hematite using direct reduction followed by melting sep aration was investigated. At the direct reduction stage, highly volatile wood char was prepared by carbonizing jujube wood at 673 K for 2 h and was used as reducing agent. The results of the direct reduction tests show that at a tem- perature of 1373 K, a char mixing ratio of 0.8, and a reduction time of 10-25 min, the briquettes reached a metal- lization degree of 80% -84% and a residual carbon content of 0.13 -1.98 mass%. Phosphorus remained in the gangue as calcium phosphate after reduction. The results of the melting separation tests show that residual carbon in reduced briquette negatively affects the phosphorus content （W[p]） in hot metal. When the reduced briquettes ob- tained under the aforementioned conditions were used for melting separation, hot metal suitable for basic oxygen steelmaking （w[p]〈0.4 mass%） could not be obtained from metallic briquettes with a residual carbon content more than 1.0 mass~. In contrast, it could be obtained from metallic briquettes with residual carbon content less than 0.35 mass% by mixing with 2%-4% Na2CO3.

关键词： high-phosphorus hematite wood char direct reduction melting separation phosphorus removal

Association mapping of quantitative trait loci for yield-related agronomic traits in rice(Oryza sativa L.)

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Journal of Integrative Agriculture 2016年第10期15卷 2192-2202页

作者： XU fei-fei jin Liang HUANG Yan TONG Chuan CHEN Ya-ling BAO jin-song Institute of Nuclear Agricultural Sciences Zhejiang University Research & Development Centre of Flower Zhejiang Academy of Agricultural Sciences

High yield in rice mainly depends on large grain weight, ideal plant architecture and proper flowering time adapting to various geographic regions. To help achieve higher yield, phenotype variations of heading date（HD）, plant architecture and grain shape in a panel of 416 rice accessions were investigated in this study. A total of 143 markers including 100 simple sequence repeat（SSR） markers and 43 gene-tagged markers were employed in association mapping to detect quantitative trait loci（QTL） responsible for these variations. Among the 7 subpopulations, POP5 in japonica group showed the largest values of HD and grain width（GW）, but the smallest values of grain length（GL） and grain length to width ratio（GLW）. Among the six indica groups, POP7 had the largest values of HD, GL, GLW, and 1 000-grain weight（TGW）. A total of 27 QTLs were detected underlying these phenotypic variations in single year, while 12 of them could be detected in 2006 and 2007. GS3 marker was closely associated with GL, GW and GLW, and widely distributed in different groups. The starch synthesis related gene markers, SSI, SSIIa, SBE1, AGPL4, and ISA1, were linked to plant height（PH）, panicle length（PL）, flag leaf length（FLL）, GW, and GLW. The SSR markers, RM267, RM340 and RM346, were linked to at least two traits. Therefore, these new markers will probably be used to improve rice grain yield or plant architecture when performing marker-assisted selection of proper alleles.

关键词： yield plant architecture heading date association mapping marker-assisted selection

Polydopamine/Imogolite Nanotubes(PDA/INTs)Interlayer Modulated Thin Film Composite Forward Osmosis Membrane for Minimizing Internal Concentration Polarization

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Chinese Journal of Polymer Science 2022年第10期40卷 1233-1241,I0010页

作者： Jian-Chen Han Shao-fei Wang Ran Deng qing-Yun Wu School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Faculty of Materials Science and Chemical Engineering Ningbo UniversityNingbo 31521China

Forward osmosis(FO)as an energy-saving membrane process has attracted much attention in food concentration,water treatment,and *** film composite(TFC)membrane is the most popular FO membrane,but it suffers from the internal concentration polarization(ICP),which significantly limits the water flux and FO *** this report,we demonstrate a novel and high-performing thin film nanocomposite(TFN)membrane that employs a hydrophilic interlayer composed of imogolite nanotubes(INTs)and polydopamine(PDA).The INTs can be adhered to the porous substrate by the self-polymerization of PDA,and the as-prepared PDA/INTs interlayer displays a nanostructured network with outstanding *** detailed investigation was conducted to understand the relationship between the structure and property of the PDA/INTs interlayer and the morphology and performance of the TFN *** TFN membrane with the PDA/INTs interlayer performs a thinner and smoother polyamide selective ***,the TFN membrane shows a water flux of 18.38 L·m^(-2)·h^(-1),which is 2.18 times of the pristine TFC ***,the TFN membrane has a minimized structural parameter(577μm),almost a half of that of the pristine one(949μm).It reveals that the ICP effect of TFC membrane can be effectively alleviated by using a hydrophilic PDA/INTs *** TFN membrane with a satisfactory water permeability is promising in terms of future applications.

关键词： Interlayer Forward osmosis Internal concentration polarization Nanotube Thin film composite membrane

Integrating Standard Dependency Schemes in QCSP Solvers

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Journal of Computer Science & Technology 2012年第1期27卷 37-41页

作者： Ji-Wei jin fei-fei Ma Jian Zhang State Key Laboratory of Computer Science Institute of SoftwareChinese Academy of SciencesBeijing 100190China

Quantified constraint satisfaction problems （QCSPs） are an extension to constraint satisfaction problems （CSPs） with both universal quantifiers and existential quantifiers. In this paper we apply variable ordering heuristics and integrate standard dependency schemes in QCSP solvers. The technique can help to decide the next variable to be assigned in QCSP solving. We also introduce a new factor into the variable ordering heuristics： a variable＇s dep is the number of variables depending on it. This factor represents the probability of getting more candidates for the next variable to be assigned. Experimental results show that variable ordering heuristics with standard dependency schemes and the new factor dep can improve the performance of QCSP solvers.

关键词： quantified constraint satisfaction problem standard dependency scheme variable ordering heuristics

Enhanced optimal delaunay triangulation methods with connectivity regularization

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Applied Mathematics(A Journal of Chinese Universities) 2022年第3期37卷 453-469页

作者： HAI Yong-qing GUO Yu-fei DONG Mo ZHAO Rong-li SUN Ke-wu SHANG fei-fei Intelligent Science and Technology Academy of CASIC Beijing 100854China Department of Mechanics and Engineering Science Peking UniversityBeijing 100871China Institute of Industry Technology Guangzhou&Chinese Academy of SciencesGuangzhou 511458China

In this paper,we study the underlying properties of optimal Delaunay triangulations(ODT)and propose enhanced ODT methods combined with connectivity *** on optimizing node positions and Delaunay triangulation iteratively,ODT methods are very effective in mesh *** paper demonstrates that the energy function minimized by ODT is nonconvex and unsmooth,thus,ODT methods suffer the problem of falling into a local minimum *** general ways that minimize the ODT energy function in terms of mathematics directly,we take an outflanking strategy combining ODT methods with connectivity regularization for this *** regularization reduces the number of irregular nodes by basic topological operations,which can be regarded as a perturbation to help ODT methods jump out of a poor local *** the enhanced ODT methods cannot guarantee to obtain a global minimum,it starts a new viewpoint of minimizing ODT energy which uses topological operations but mathematical *** in terms of practical effect,several experimental results illustrate the enhanced ODT methods are capable of improving the mesh furtherly compared to general ODT methods.

关键词： mesh optimization connectivity regularization ODT methods triangular mesh