Microscopic mechanism of room-temperature superconductivity in compressed LaH10

Liu, Liangliang,Wang, Chongze,Yi, Seho,Kim, Kun Woo,Kim, Jaeyong,Cho, Jun-Hyung American Physical Society 2019 Physical Review B Vol.99 No.14

Fabrication of Columnar NaNbO3‑Based Particles Through Topochemical Microcrystal Conversion

Liangliang Liu,Rui Lv,Zhuangzhuang Guo,Yongqiang Wang 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.1

The columnar NaNbO3-based particles with a perovskite structure were successfully synthesized through topochemical microcrystal conversion. First, the precursor was fabricated by facile MSS in the Nb2O5–KCl system. A good dispersion and high aspect ratio were satisfed simultaneously with a small amount of SrCO3 and KSr2Nb5O15 (KSN) seed. Then, columnar NaNbO3-based particles, 10 μm in length and 1 μm in diameter, were obtained via the simple molten salt reaction from the precursor. The results of NaNbO3-based ceramics suggested that the as-synthesized NaNbO3-based particles had the good mechanical properties and homogeneous chemical composition.

Effect of Hydrogen on O₂ Adsorption and Dissociation on a TiO₂ Anatase (001) Surface

Liu, Liangliang,Wang, Zhu,Pan, Chunxu,Xiao, Wei,Cho ,, Kyeongjae WILEY‐VCH Verlag 2013 Chemphyschem Vol.14 No.5

<P><B>Abstract</B></P><P>The effect of hydrogen on the adsorption and dissociation of the oxygen molecule on a TiO<SUB>2</SUB> anatase (001) surface is studied by first‐principles calculations coupled with the nudged elastic band (NEB) method. Hydrogen adatoms on the surface can increase the absolute value of the adsorption energy of the oxygen molecule. A single H adatom on an anatase (001) surface can lower dramatically the dissociation barrier of the oxygen molecule. The adsorption energy of an O<SUB>2</SUB> molecule is high enough to break the OO bond. The system energy is lowered after dissociation. If two H adatoms are together on the surface, an oxygen molecule can be also strongly adsorbed, and the adsorption energy is high enough to break the OO bond. However, the system energy increases after dissociation. Because dissociation of the oxygen molecule on a hydrogenated anatase (001) surface is more efficient, and the oxygen adatoms on the anatase surface can be used to oxidize other adsorbed toxic small gas molecules, hydrogenated anatase is a promising catalyst candidate.</P>

O₂ Adsorption and Dissociation on A Hydrogenated Anatase (101) Surface

Liu, Liangliang,Liu, Qin,Zheng, Yongping,Wang, Zhu,Pan, Chunxu,Xiao, Wei American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.7

<P>O<SUB>2</SUB> adsorption and dissociation on a hydrogenated anatase (101) surface are studied with first-principle calculations coupled with the nudged elastic band (NEB) method. H atoms on the anatase (101) surface or at subsurface sites can increase the absolute values of the O<SUB>2</SUB> adsorption energy. The O<SUB>2</SUB> dissociation barriers on an anatase surface with two H atoms at the subsurface sites or with a H surface adatom and a subsurface atom are much lower than that of the dissociation on a surface with H adatoms on the (101) surface. After the dissociation, OH, H<SUB>2</SUB>O, and O adatoms may form on the surface. Because it is not difficult for H adatoms on the surface to diffuse to the subsurface sites, surface H doping atoms are very useful to reduce the O<SUB>2</SUB> dissociation barrier. The anatase particles with hydrogenated (101) surface are efficient catalysts to oxidize the adsorbed toxic gas molecule.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-7/jp408221x/production/images/medium/jp-2013-08221x_0025.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp408221x'>ACS Electronic Supporting Info</A></P>

Theoretical prediction of Weyl fermions in the paramagnetic electride Y2C

Liu, Liangliang,Wang, Chongze,Yi, Seho,Kim, Dou Kyun,Park, Chul Hong,Cho, Jun-Hyung American Physical Society 2019 Physical Review B Vol.99 No.22

Identification of Zygosaccharomyces mellis strains in stored honey and their stress tolerance

Liu, Gongliang,Tao, Changli,Zhu, Baosheng,Bai, Weidong,Zhang, Liangliang,Wang, Zengpeng,Liang, Xingting 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.6

To screen yeast with high sugar tolerance and evaluate their stress tolerance, six yeast strains were selected from 17 stored honey samples. The species were identified through 26S rRNA sequencing. Their stress tolerance was determined via the Durham fermentation method and ethanol production ability was determined via flask fermentation. The results demonstrated that all the six strains were Zygosaccharomyces mellis. Their sugar, ethanol, and acid tolerance ranges were 500-700 g/L, 10-12% (v/v), and pH 2.5-4.5, respectively. The $SO_2$ tolerance was 250 mg/L. Among the six strains, 6-7431 had the best stress tolerance with sugar tolerance of 700 g/L, ethanol tolerance of 12% (v/v), and acid tolerance of pH 2.5. Furthermore, the strain of 6-7431 had the highest percentage of ethanol production at the same initial sugar content as the other strains. Therefore, the selected six yeast strains would be promising fermentation yeasts for wine-making, ethanol production, or other fermentation purposes.

Identification of Zygosaccharomyces mellis strains in stored honey and their stress tolerance

Gongliang Liu,Changli Tao,Baosheng Zhu,Weidong Bai,Liangliang Zhang,Zengpeng Wang,Xingting Liang 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.6

To screen yeast with high sugar tolerance and evaluate their stress tolerance, six yeast strains were selected from 17 stored honey samples. The species were identified through 26S rRNA sequencing. Their stress tolerance was determined via the Durham fermentation method and ethanol production ability was determined via flask fermentation. The results demonstrated that all the six strains were Zygosaccharomyces mellis. Their sugar, ethanol, and acid tolerance ranges were 500–700 g/L, 10–12% (v/v), and pH 2.5–4.5, respectively. The SO2 tolerance was 250 mg/L. Among the six strains, 6-7431 had the best stress tolerance with sugar tolerance of 700 g/L, ethanol tolerance of 12% (v/v), and acid tolerance of pH 2.5. Furthermore, the strain of 6-7431 had the highest percentage of ethanol production at the same initial sugar content as the other strains. Therefore, the selected six yeast strains would be promising fermentation yeasts for wine-making, ethanol production, or other fermentation purposes.

Deep learning-based sensor fault detection using S-Long Short Term Memory Networks

Li, Lili,Liu, Gang,Zhang, Liangliang,Li, Qing Techno-Press 2018 Structural monitoring and maintenance Vol.5 No.1

A number of sensing techniques have been implemented for detecting defects in civil infrastructures instead of onsite human inspections in structural health monitoring. However, the issue of faults in sensors has not received much attention. This issue may lead to incorrect interpretation of data and false alarms. To overcome these challenges, this article presents a deep learning-based method with a new architecture of Stateful Long Short Term Memory Neural Networks (S-LSTM NN) for detecting sensor fault without going into details of the fault features. As LSTMs are capable of learning data features automatically, and the proposed method works without an accurate mathematical model. The detection of four types of sensor faults are studied in this paper. Non-stationary acceleration responses of a three-span continuous bridge when under operational conditions are studied. A deep network model is applied to the measured bridge data with estimation to detect the sensor fault. Another set of sensor output data is used to supervise the network parameters and backpropagation algorithm to fine tune the parameters to establish a deep self-coding network model. The response residuals between the true value and the predicted value of the deep S-LSTM network was statistically analyzed to determine the fault threshold of sensor. Experimental study with a cable-stayed bridge further indicated that the proposed method is robust in the detection of the sensor fault.

Dynamic response of a base-isolated CRLSS with baffle

Cheng, Xuansheng,Liu, Bo,Cao, Liangliang,Yu, Dongpo,Feng, Huan Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.66 No.3

Although a rubber isolation cushion can reduce the dynamic response of a structure itself, it has little influence on the height of a sloshing wave and even may induce magnification action. Vertical baffles are set into a base-isolated Concrete Rectangular Liquid Storage Structure (CRLSS), and baffles are opened as holes to increase the energy dissipation of the damping. Problems of liquid nonlinear motion caused by baffles are described using the Navier-Stokes equation, and the space model of CRLSS is established considering the Fluid-Solid Interaction (FSI) based on the Finite Element Method (FEM). The dynamic response of an isolated CRLSS with various baffles under an earthquake is analyzed, and the results are compared. The results show that when the baffle number is certain, the greater the number of holes in baffles, the worse the damping effects; when a single baffle with holes is set in juxtaposition and double baffles with holes are formed, although some of the dynamic response will slightly increase, the wallboard strain and the height of the sloshing wave evidently decrease. A configuration with fewer holes in the baffles and a greater number of baffles is more helpful to prevent the occurrence of two failure modes: wallboard leakage and excessive sloshing height.

Deformation research of Silty Clay Under Freeze-Thaw Cycles

Lihui Tian,Liangliang Yu,Shiming Liu,Bo Zhang 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.2

To explore the dynamic properties of silty clay in seasonally frozen ground under repeated freeze-thaw cycles, an unconsolidated undrained dynamic triaxial test was conducted on such properties under various confining pressures, number of freeze-thaw cycles, and dynamic stress amplitudes. The test results showed that due to the impact of freeze-thaw cycles, the inherent structure of the soil underwent some major changes, in which the resilient strain increased and the resilient modulus decreased. However, as the number of freeze-thaw cycles increased, the effect was reduced and eventually tended to be stable. As the number of freeze-thaw cycles increased, the cumulative plastic strain of the soil rose rapidly, and the soil samples became more prone to fracture at low stress amplitudes and small number of vibrations. The more the number of freeze-thaw cycles, the higher the cumulative plastic strain rate generated under a single dynamic stress amplitude. Moreover, with the increase in the confining pressure, the failure form of the thawed silty clay gradually evolved from a plastic fracture to a brittle one. The research results of this paper were helpful to further understand the influence of freeze-thaw cycle on the dynamic properties of silty clay, and provide data support for the subsequent research on the mechanism of roadbed diseases under the load in seasonally frozen ground.