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Your search keyword '"Wang, Dong-Dong"' showing total 25 results
Start Over Author "Wang, Dong-Dong" Publisher springer science and business media llc
25 results on '"Wang, Dong-Dong"'

6. Short- and long-term outcomes of laparoscopic versus open liver resection for large hepatocellular carcinoma: a propensity score study

Author

Zhang, Kang-Jun, primary, Liang, Lei, additional, Diao, Yong-Kang, additional, Xie, Ya-Ming, additional, Wang, Dong-Dong, additional, Xu, Fei-Qi, additional, Ye, Tai-Wei, additional, Lu, Wen-Feng, additional, Cheng, Jian, additional, Shen, Guo-Liang, additional, Yao, Wei-Feng, additional, Lu, Yi, additional, Xiao, Zun-Qiang, additional, Zhang, Jun-Gang, additional, Zhang, Cheng-Wu, additional, Huang, Dong-Sheng, additional, and Liu, Jun-Wei, additional

Published
2022
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15. An ultra-accurate dynamic isogeometric analysis with higher order mass formulation

Author

LI XiWei, Wang Dong-dong, Liu Wei, and Zhang Hanjie

Subjects
Vibration, Mathematical optimization, Discretization, Bandwidth (signal processing), General Engineering, Applied mathematics, General Materials Science, Isogeometric analysis, Mass matrix, Conservation of mass, Finite element method, Eigenvalues and eigenvectors, Mathematics
Abstract

An ultra-accurate isogeometric dynamic analysis is presented. The key ingredient of the proposed methodology is the development of isogeometric higher order mass matrix. A new one-step method is proposed for the construction of higher order mass matrix. In this approach, an adjustable mass matrix is formulated through introducing a set of mass parameters into the consistent mass matrix under the element mass conservation condition. Then the semi-discrete frequency derived from the free vibration equation with the adjustable mass matrix is served as a measure to optimize the mass parameters. In 1D analysis, it turns out that the present one-step method can perfectly recover the existing reduced bandwidth mass matrix and the higher order mass matrix by choosing different mass parameters. However, the employment of the proposed one-step method to the 2D membrane problem yields a remarkable gain of solution accuracy compared with the higher order mass matrix generated by the original two-step method. Subsequently a full-discrete isogeometric transient analysis algorithm is presented by using the Newmark time integration scheme and the higher order mass matrix. The full-discrete frequency is derived to assess the accuracy of space-time discretization. Finally a set of numerical examples are presented to evaluate the accuracy of the proposed method, which show that very favorable solution accuracy is achieved by the present dynamic isogeometric analysis with higher order mass formulation compared with that obtained from the standard consistent mass approach.

Published
2014

18. NIR-red spectral space based new method for soil moisture monitoring

Author

Ghulan Abduwasit, Wang Dong-dong, Zhan ZhiMing, and Qin Qiming

Subjects
Soil depth, Surface moisture, Pedotransfer function, Evapotranspiration, General Earth and Planetary Sciences, Environmental science, Spectral space, Satellite, Soil science, Spatial distribution, Water content
Abstract

Drought is a complex natural disaster that occurs frequently. Soil moisture has been the main issue in remote monitoring of drought events as the most direct and important variable describing the drought. Spatio-temporal distribution and variation of soil moisture evidently affect surface evapotranspiration, agricultural water demand, etc. In this paper, a new simple method for soil moisture monitoring is developed using near-infrared versus red (NIR-red) spectral reflectance space. First, NIR-red spectral reflectance space is established using atmospheric and geometric corrected ETM+ data, which is manifested by a triangle shape, in which different surface covers have similar spatial distribution rules. Next, the model of soil moisture monitoring by remote sensing (SMMRS) is developed on the basis of the distribution characteristics of soil moisture in the NIR-red spectral reflectance space. Then, the SMMRS model is validated by comparison with field measured soil moisture data at different depths. The results showed that satellite estimated soil moisture by SMMRS is highly accordant with field measured data at 5 cm soil depth and average soil moisture at 0–20 cm soil depths, correlation coefficients are 0.80 and 0.87, respectively. This paper concludes that, being simple and effective, the SMMRS model has great potential to estimate surface moisture conditions.

Published
2007

19. The synthesis and crystal structure of (4E)-5(3-chlorophenyl)-N-(4-chlorophenyl)-2-diazo3-oxopent-4-enoic acid amide

Author

Jin Chi-Qiong, Wang Dong-Dong, and Dong Heng-Shan

Subjects
chemistry.chemical_compound, chemistry, Stereochemistry, Amide, General Chemistry, Crystal structure, Condensed Matter Physics, Organometallic chemistry, Monoclinic crystal system
Abstract

(4E)-5-(3-Chlorophenyl)-N-(4-chlorophenyl)-2-diazo-3-oxopent-4-enoic acid amide (5) was synthesized from p-chloroaniline to N-(4-chlorophenyl)-2-diazo-3-oxo-butyramide (4) with 3-chlorobenzaldehyde. The yielded product 5 was investigated with X-ray crystallographic, NMR, MS, and IR techniques. Compound 5 (C17H11Cl2N3O2, Formula wt = 360.19), crystallizes in the monoclinic space group P21/c with unit cell parameters a = 10.516(2), b = 17.996(4), c = 8.902(2) A, α = 90.00, β = 105.36(3), γ = 90.00∘. V = 1624.5(6) A3, Z = 4, Dx = 1.473 Mg m−3. The final R was 0.0511.

Published
2005

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