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Study of parametric roll in oblique waves using a three-dimensional hybrid panel method

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Journal of Hydrodynamics 2020年第1期32卷 126-138页

作者： min gu Shu-xia Bu Jiang Lu Jiangsu Key Laboralory of Green Ship Technology China Ship Scientific Research CenterWiuxi 214082.China

A reliable numerical tool for the prediction of the parametric roll is important in the development of the second generation intact stability *** main difficulty of the prediction of the parametric roll comes from the significant coupling of the roll with other motions,especially the heave and pitch *** this paper,the numerical method for determining the parametric roll is studied and the results are benchmarked against the model test ***,a 3 degrees-of-freedom(DOF)time domain hybrid panel method is validated by experimental data in regular oblique waves and irregular head ***,the verified 3D O F method is extended to a fully coupled 6 DOF method with the course ***,taking the C11 containership as the test case,the parametric roll in oblique waves is computed,and the effects of the surge,sway and yaw motions on the parametric roll are evaluated with the developed mathematical *** results show that the effects of the surge and sway motions on the parametric roll is insignificant,while the effects of the yaw motion are more *** results of the roll amplitudes and the standard deviation of the roll angles show that the model based on 3 DOF gives relatively conservative results,and can be directly used for the stability assessment of the parametric roll.

关键词： 6DOF mathematical model irregular oblique waves second generation intact stability in IMO

Preparation of TeO_x-SiO_2 film with excellent third-order nonlinear optical properties by electrochemically induced sol-gel method

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Chinese Chemical Letters 2011年第11期22卷 1359-1362页

作者： Qiang Li min gu State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam Key Lab for the Exploitation of Southwestern Resources and the Environmental Disaster Control Engineering of Education Ministry College of Resources and Environmental Science Chongqing University Chongqing 400044 China

TeOx-SiO2 composite films having third-order nonlinearities were prepared by electrochemically induced sol-gel deposition method on ITO *** third-order optical nonlinearities of the films were measured by Z-scan *** third-order nonlinear susceptibilities（χ^（（3））） of the as-prepared films are 5.9×10^（-7） to 4.29×10^（-6）*** surface morphology and composition of the films were characterized by SEM/EDX,which identified that Te metallic particles well dispersed in TeO_x-SiO_2 gel films.

关键词： TeOx-SiO2 composite Electrochemically induced sol-gel method Third-order nonlinearities Z-scan

Heavy collecting induces smaller and deeper Fritillariae Cirrhosae Bulbus in the wild

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Plant Diversity 2017年第4期39卷 208-213页

作者： Xinhui Li Lin Liu Xu gu Jianying xiang College of Environmental Science and Engineering Southwest Forestry University Kunming 650224 China Shangri-La Alpine Botanical Garden Shangri-la 674400 China Yunnan Academy of Biodiversity Southwest Forestry University Kunming 650224 China

Fritillariae Cirrhosae Bulbus is a well-known traditional Chine medicinal herb. However, the demand for this herb is leading to over-collection and its decline in the wild. This study aims to investigate the ecological conditions of Fritillaria cirrhosa under the influence of human disturbance, biotic species interactions and climatic conditions. We established a total of 78 plots at 14 sites of F. cirrhosa in its distribution center, the Hengduan Mountains area. At each site, we estimated the abundance of F. cirrhosa at different distances from roads. The diameter and height of F. cirrhosa fruit and bulbs were measured and compared to underground bulb depth. We then analyzed the effects of environmental conditions and human disturbance on the abundance of F. cirrhosa using variance partitioning. We found that(1)abundance of F. cirrhosa and their underground bulb depth showed a significant linear increase with the distance from the main road;(2) the diameter/height of fruits and the diameter/height of fruits/bulbs showed significantly different responses to the human disturbance;(3) the community associates,climate and spatial conditions can explain 58%, 22% and 27%, respectively, of the variance in the F. cirrhosa abundance. These results highlight the fact that human disturbance and biotic factors have a great influence on the survival of F. cirrhosa, even more than climate conditions.

关键词： Fritillaria cirrhosa Human disturbance Plant abundance Biotic interactions

Experimental and numerical demonstration of hierarchical time-delay reservoir computing based on cascaded VCSELs with feedback and multiple injections

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Science China(Information Sciences) 2024年第2期67卷 279-290页

作者： Xingxing guO Shuiying xiang Xingyu CAO Biling gu State Key Laboratory of Integrated Service Networks Xidian University State Key Discipline Laboratory of Wide Bandgap Semiconductor Technology School of MicroelectronicsXidian University

In this paper, we propose and demonstrate experimentally and numerically a hierarchical timedelay optical reservoir computing(RC) system based on cascaded vertical-cavity surface-emitting lasers(VCSELs) with feedback and multiple injections. The prediction performance characteristics of the hierarchical time-delay RC system based on cascaded VCSELs under different reservoir layers are ***, the prediction performance of the hierarchical time-delay RC system is first improved and saturates as the number of reservoir layers increases. Besides, the impacts of key factors on predicting the hierarchical time-delay RC system are also analyzed in detail experimentally and numerically. This proposed hierarchical time-delay RC system based on VCSELs is useful for the further development of RC systems and may be beneficial to improve the ability of RC systems to solve more complex problems.

关键词： vertical-cavity surface-emitting laser reservoir computing neuromorphic photonics time-delay system information processing

Seaweed glue as a novel polymer depressant for the selective separation of chalcopyrite and galena

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International Journal of minerals,Metallurgy and Materials 2019年第12期26卷 1495-1503页

作者： Xiong Chen guo-hua gu Zhi-xiang Chen School of minerals Processing and Bioengineering Central South University

The use of seaweed glue(SEG)as a novel polymer depressant for the separation of chalcopyrite from galena with butyl xanthate(BX)as a collector was studied through microflotation *** angle,adsorption,dynamic potential,and infrared spectral analyses were conducted to clarify the mechanism underlying the action of SEG on *** results of microflotation experiments indicated that chalcopyrite could be selectively separated from galena by using a SEG depressant concentration of 15 mg·L^-1,BX concentration of 10 mg·L^-1,and methyl isobutyl carbinol concentration of 8.5 mg·L^-1 at pH 8.0.A Cu concentrate with a grading of 23.68wt% was obtained at a recovery rate of 81.52% from mixed minerals with 8.29wt% Cu *** angle analysis showed that the effect of SEG on the wettability of galena was stronger than that on the wettability of ***,zeta potential,and FT-IR spectral analyses revealed that SEG and BX were coadsorbed on the surfaces of *** depressed galena by covering xanthate ions in the functional groups of-COO and mainly underwent weak physisorption on *** mechanisms account for the ability of SEG to depress galena effectively while enabling chalcopyrite flotation.

关键词： seaweed glue chalcopyrite galena flotation separation

Corrosion Inhibition of SiCp/5A06 Aluminum Metal Matrix Composite by Cerium Conversion Treatment

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Chinese Journal of Aeronautics 2009年第6期22卷 670-676页

作者： Irfan Aziz Zhang Qi xiang min School of Materials Science and Engineering Beo'ing University of Aeronautics and Astronautics Beijing 100191 China

This article studies the effects of the CeCl3 concentrations in conversion solutions with and without addition of NaCl, pH-values of conversion solution, drying temperature, time and temperature of immersion on the Ce-conversion coatings for corrosion protection of the SiCp/5A06 Al-MMC and 5A06 Al-alloy in the 3.5% NaCl aqueous solution at room temperature. Potentiodynamic polarization tests reveal that the Ce-conversion treatment could markedly improve the pitting corrosion resistance of the composite and the matrix alloy in chloride containing environment. The best corrosion resistance effects are obtained for the samples treatment in 1% CeCl3.7H2O/3.5% NaCl solution at 45℃ for 60 min, followed by drying at 100 ℃ for 30 min. Examinations by means of scanning electron microscopy （SEM）, energy dispersion spectroscopy （EDS） and X-ray photoelectron spectroscopy （XPS） indicate that this behavior is due to the precipitation of Ce-oxides/hydroxides on the cathodic intermetallics and the Al-oxide film on the rest of the metal matrix.

关键词： cerium thermal coatings SiCp/5A06 Al matrix composites potentiodynamic polarization alkaline corrosion

Solutions for Schrodinger-Poisson system involving nonlocal term and critical exponent

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Applied Mathematics(A Journal of Chinese Universities) 2023年第3期38卷 357-372页

作者： MO Xiu-ming MAO An-min WANG xiang-xiang School of Biomedicine Beijing City UniversityBeijing 100094China School of Mathematical Sciences Qufu Normal UniversityQufu 273165China.

In this paper,we consider the following Kirchhoff-Schrodinger-Poisson system:{−(a+b∫_(R^(3))|∇u|^(2))△u+u+ϕu=μQ(x)|u|^(q-2)u+K(x)|u|^(4)u,in R^(3),−△ϕ=u^(2) the nonlinear growth of|u|^(4)u reaches the Sobolev critical *** combining the variational method with the concentration-compactness principle of Lions,we establish the existence of a positive solution and a positive radial solution to this problem under some suitable *** nonlinear term includes the nonlinearity f(u)~|u|^(q-2)u for the well-studied case q∈[4,6),and the less-studied case q∈(2,3),we adopt two different strategies to handle these *** result improves and extends some related works in the literature.

关键词： variational methods critical exponent concentration-compactness principle

Two Crystal Phases of C3N4 Found in Carbon Nitride Films Prepared by Ion Implantation

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Chinese Physics Letters 1996年第10期13卷 782-785页

作者： gu You-song PAN Li-qing ZHAO min-xue CHANG xiang-rong TIAN Zhong-zhuo XIAO Ji-mei Department of Material Physics and State Key Laboratory of New Metal MaterialsBeijing University of Sciences and TechnologyBeijing 100083

CNx films prepared by high dose ion implantation and post-annealing were studied by Auger electron spectroscopy,x-ray photoelectron spectroscopy and x-ray diffraction.A nearly uniform CNx layer was *** and nitrogen were found covalently bonded in the films.X-ray diffraction results showed that two crystal phases of C_(3)N_(4),β-C_(3)N_(4) and p-C_(3)N_(4),have been formed in the matrix of carbon.

关键词： diffraction. implantation spectroscopy

Vectorial adaptive optics:expanding the frontiers of optical correction

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Light(Science & Applications) 2024年第2期13卷 170-171页

作者： Qiming Zhang min gu Institute of Photonic Chips University of Shanghai for Science and TechnologyShanghai200093China

Researchers at the University of Oxford have introduced a groundbreaking technique called vectorial adaptive optics(V-AO),which extends the capabilities of traditional adaptive optics to correct for both polarization and phase *** novel approach opens new possibilities for manipulating the complex vectorial field in optical systems,enabling higher-dimensional feedback correction.

关键词： optics correction frontier