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247 results on '"Liu, Baoyuan"'

1. Polyurethane Foam Chemical Recycling: Fast Acidolysis with Maleic Acid and Full Recovery of Polyol.

Author

Liu, Baoyuan, Westman, Zach, Richardson, Kelsey, Lim, Dingyuan, Stottlemyer, Alan, Farmer, Thomas, Gillis, Paul, Hooshyar, Nasim, Vlcek, Vojtech, Christopher, Phillip, and Abu-Omar, Mahdi

Abstract

Chemical recycling of polyurethane (PU) waste is essential to displace the need for virgin polyol production and enable sustainable PU production. Currently, less than 20% of PU waste is downcycled through rebinding to lower value products than the original PU. Chemical recycling of PU waste often requires significant input of materials like solvents and slow reaction rates. Here, we report the fast (

Published
2024

2. GUGA-based MRCI approach with Core-Valence Separation Approximation (CVS) for the calculation of the Core-Excited States of molecules

Author

Song, Qi, Liu, Baoyuan, Wu, Junfeng, Zou, Wenli, Wang, Yubin, Suo, Bingbing, and Lei, Yibo

Subjects
Physics - Computational Physics, Physics - Chemical Physics
Abstract

We develop and demonstrate how to use the GUGA-based MRCISD with Core-Valence Separation approximation (CVS) to compute the core-excited states. Firstly, perform a normal SCF or valence MCSCF calculation to optimize the molecular orbitals. Secondly, rotate the optimized target core orbitals and append to the active space, form an extended CVS active space, and perform a CVS-MCSCF calculation for core-excited states. Finally, construct the CVS-MRCI expansion space, and perform a CVS-MRCI calculation to optimize the CI coefficients based on the variational method. The CVS approximation with GUGA-based methods can be implemented by flexible truncation of the Distinct Row Table (DRT). Eliminating the valence-excited configurations from the CVS-MRCI expansion space can prevent variational collapse in the Davidson iteration diagonalization. The accuracy of the CVS-MRCI scheme was investigated for excitation energies and compared with that of the CVS-MCSCF method. The results show that CVS-MRCI is capable of reproducing well-matched vertical core excitation energies that are consistent with experiments, by combining large basis sets and a rational reference space. The calculation results also highlight the fact that the dynamic correlation between electrons makes an undeniable contribution in core-excited states.

Published
2023

5. Basic Characteristics of Windbreak in the Black Soil Region of Northeast China and Its Relationship with Wind Direction

Author

MA Yixue, LIU Baoyuan, ZHANG Mengna, DONG Lixia, and ZHANG Geng

Subjects
windbreak, wind erosion, windbreak direction, prevailing wind erosion direction, Environmental sciences, GE1-350, Agriculture
Abstract

[Objective] In order to explore the relationship between the windbreak direction and the prevailing wind erosion direction in the black soil region of Northeast China. [Methods] The basic characteristics of the windbreak in the study area were obtained by remote sensing interpretation and field survey, and the angle of intersection between the windbreak direction and the prevailing wind erosion direction, that is, the wind direction declination angle, was calculated and analyzed by combining the wind speed and wind direction data of 43 meteorological stations in the study area. [Results] The westerly wind in Mengdong black soil sub-region accounted for a large proportion, the wind direction was more concentrated, the prevailing wind erosion direction dominance was strong, the wind direction in the Songnen black soil sub-region was scattered, and the prevailing wind erosion direction dominance was weak. Average windbreak density Songnen black soil sub-area > Mengdong black soil sub-region; The windbreak direction accounted for the largest proportion in the Songnen black soil sub-area was the N-S trend windbreak direction, and there was no obvious regularity in the Mengdong black soil sub-region. In the study area, the proportion of wind declination angle 30° was 70.40%, and the wind protection effect was poor. [Conclusion] The direction of a large number of windbreak in the study area is oblique to the prevailing wind erosion direction, and the protective effect is poor. The results of this study have important reference value for understanding the density and trend of existing windbreak belts, and for further construction and transformation of windbreak.

Published
2024
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18. Hepatitis E virus ORF3 protein hijacking thioredoxin domain-containing protein 5 (TXNDC5) for its stability to promote viral particle release

Author

Sheng, Yamin, primary, Deng, Yingying, additional, Li, Xiaoxuan, additional, Ji, Pinpin, additional, Sun, Xuwen, additional, Liu, Baoyuan, additional, Zhu, Jiahong, additional, Zhao, Jiakai, additional, Nan, Yuchen, additional, Zhou, En-Min, additional, Hiscox, Julian A., additional, Stewart, James P., additional, Sun, Yani, additional, and Zhao, Qin, additional

Published
2024
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19. Design of Efficient Convolutional Layers using Single Intra-channel Convolution, Topological Subdivisioning and Spatial 'Bottleneck' Structure

Author

Wang, Min, Liu, Baoyuan, and Foroosh, Hassan

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Deep convolutional neural networks achieve remarkable visual recognition performance, at the cost of high computational complexity. In this paper, we have a new design of efficient convolutional layers based on three schemes. The 3D convolution operation in a convolutional layer can be considered as performing spatial convolution in each channel and linear projection across channels simultaneously. By unravelling them and arranging the spatial convolution sequentially, the proposed layer is composed of a single intra-channel convolution, of which the computation is negligible, and a linear channel projection. A topological subdivisioning is adopted to reduce the connection between the input channels and output channels. Additionally, we also introduce a spatial "bottleneck" structure that utilizes a convolution-projection-deconvolution pipeline to take advantage of the correlation between adjacent pixels in the input. Our experiments demonstrate that the proposed layers remarkably outperform the standard convolutional layers with regard to accuracy/complexity ratio. Our models achieve similar accuracy to VGG, ResNet-50, ResNet-101 while requiring 42, 4.5, 6.5 times less computation respectively.

Published
2016

28. A novel strategy for an anti-idiotype vaccine: nanobody mimicking neutralization epitope of porcine circovirus type 2

Author

Deng, Yingying, primary, Sheng, Yamin, additional, Zhang, Guixi, additional, Sun, Yani, additional, Wang, Lei, additional, Ji, Pinpin, additional, Zhu, Jiahong, additional, Wang, Gang, additional, Liu, Baoyuan, additional, Zhou, En-Min, additional, Cai, Xuehui, additional, Tu, Yabin, additional, Hiscox, Julian A., additional, Stewart, James P., additional, Mu, Yang, additional, and Zhao, Qin, additional

Published
2024
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33. Development of Heterogeneous Catalysis with Lignin Monomers and Carbohydrates Obtained from “Lignin First” Biorefinery

Author

Liu, Baoyuan

Subjects
Chemistry, Inorganic chemistry, Biomass, Catalysis, Cellulose, Hydrocarbon Fuel, Lignin
Abstract

Lignocellulosic biomass is composed of lignin, cellulose, and hemicellulose. Lignin is naturally formed renewable aromatic biopolymer; the cellulose and hemicellulose are polysaccharides. By far, the “second generation” biorefineries mainly use the value of cellulose pulp in paper industries or in making low-value chemicals such as ethanol while more than 98% of lignin is discarded into direct combustion. The valorizations of lignin and polysaccharides are still under development. Herein, we have studied the heterogeneous catalytic conversion of lignin monomers and polysaccharides with Ru/C catalyst with different metal oxides for making a variety of value-added chemicals. For instance, we developed a Ru/C and Nb2O5 co-catalyst system to funnel different lignin monomers into C9 hydrocarbons which could potentially be used as drop-in fuels. We also investigated the Ru/C and WOx co-catalysts to convert the polysaccharides into diols and polyols. By performing the isotopic reactions and time programmed sampling, our study disclosed the mechanisms and kinetics of the catalytic reactions. To achieve the goal of biomass valorization, we also developed a purification method to avoid catalyst poisoning by the contaminations from raw biomass and thus facilitated the sustainable utilization of native lignin into valuable chemicals.

Published
2021

39. Vegetation restoration dominated the attenuated soil loss rate on the Loess Plateau, China over the last 50 years

Author

National Key Research and Development Program (China), National Natural Science Foundation of China, He, Liang, Guo, Jinwei, Zhang, Xiaoping, Liu, Baoyuan, Guzmán, Gema, Gómez Calero, José Alfonso, National Key Research and Development Program (China), National Natural Science Foundation of China, He, Liang, Guo, Jinwei, Zhang, Xiaoping, Liu, Baoyuan, Guzmán, Gema, and Gómez Calero, José Alfonso

Abstract

The Chinese Loess Plateau has experienced large-scale land use changes in the past few decades. Understanding how land use change affects soil erosion is critical in the region's ecological construction and land management. In this study, the Beiluo River Basin in the core area of the Loess Plateau was selected to investigate the effects of land use changes on soil loss rates over the last 50 years. Results show that the land use has changed considerably, mainly reflected in the upper reaches. From 1970 to 2020, cropland in the upper reaches decreased by 54 %, directly leading to a 9.1-fold increase in forested land. Landsat-NDVI shows vegetation coverage increased from 21.1 % to 69.9 % over time. The Chinese Soil Loss Equation (CSLE) was used and confirmed to be satisfactory with a high coefficient of determination (R2, 0.89) and a strong Nash–Sutcliffe efficiency coefficient (0.72), although an underestimation exists. The specific soil loss simulated in the upper reaches maintained a high rate of around 8,000 t·km−2·yr−1 from the 1970s to the 1990s, dramatically dropping to 3,058 t·km−2·yr−1 in the 2000s, then attenuated to 1,321 t·km−2·yr−1 in the 2020s. For the entire basin, soil loss rates dropped from 4,090 to 1,848 and 890 t·km−2·yr−1 from the 1970s to the 2000s and 2020s, respectively. Attribution analysis showed that the dominant factor of the change in soil loss rates in the 1980s and 1990s relative to the 1970s was the change in rainfall erosivity for the entire watershed. However, vegetation restoration rapidly converted to the dominant factor contributing 78.3 % to soil loss decrease in the 2000s. The shift is evident in each reach of the basin except the terrain-plain area with the majority of farmland. The findings are helpful for sustainable land use planning and socio-economic development on the Loess Plateau and in similar areas.

Published
2023

48. A new nanobody-enzyme fusion protein–linked immunoassay for detecting antibodies against influenza A virus in different species

Author

Ji, Pinpin, primary, Wang, Kun, additional, Zhang, Lu, additional, Yan, Zhenda, additional, Kong, Min, additional, Sun, Xuwen, additional, Zhang, Qiang, additional, Zhou, Ning, additional, Liu, Baoyuan, additional, Zhou, En-Min, additional, Sun, Yani, additional, Wang, Xinjie, additional, and Zhao, Qin, additional

Published
2022
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