CO2 Adsorption on the B12N12 Nanocage Encapsulated with Alkali Metals: A Density Functional Study

Haiyan Zhu,Qiyan Zhang,Qinfu Zhao,He Zhao,Yifan Feng,Bingbing Suo,Huixian Han,Qi Song,Yawei Li,Wenli Zou,Haiyan Zhu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.3

Density functional theory (DFT) calculations have been carried out to study the capacity of the B12N12 nanocage encapsulated with alkali metals (Li, Na, K) for the CO2 adsorption and activation. It is found that after encapsulating alkali metals, the alkali metal atoms are closer to one side of clusters instead of exactly lying at the center, and a considerable charge transfers from the inner alkali metal atoms to the B12N12 cage. Besides, the HOMO–LUMO gap (HLG) values of Li@B12N12, Na@B12N12 and K@B12N12 are decreased to about 6 eV, being much smaller than that of the pristine B12N12. Although the geometry structure parameters and the energy differences of M06-2X are slightly different from the ones of ωB97X-D, some identical results of two kinds of functional can be obtained. CO2 can be adsorbed chemically and physically on majority bonds of all the clusters, except for some bonds with large change in bond length and bond indices. The encapsulation of alkali-metal atoms may enhance the physical and chemical adsorption of CO2 on the surface of the clusters, in which Na@B12N12 and K@B12N12 are the most powerful physical and chemical adsorbent for CO2, respectively.

Multi-objective collaborative optimization using linear physical programming with dynamic weight

Haiyan Li,Mingxu Ma,Wenlei Zhang 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.2

The multi-objective collaborative optimization problem with multi-objective subsystems has a bi-level optimization architecture, that consists of the system and subsystem levels. Combining the multi-objective optimization algorithm with a bi-level optimization structure can obtain a satisfactory solution. Given that the preference-based algorithm requires minimal running time, the Linear physical programming (LPP) method, one of the typical preference-based algorithms, is adopted. Considering that setting the preference values for the incompatibility function is difficult, the weighted incompatibility function is added to the piecewise linear function of the LPP model. An expression of dynamic weight is also presented according to the inconsistency among the subsystems, which is caused by the sharing and auxiliary variables relative to the different subsystems. Using an engineering example, this study reveals that the interdisciplinary consistency is satisfactory when the dynamic weight is used in the LPP model, which thereby demonstrates the effectiveness of the presented method.

Synergistic enhancement of external electrical energy in PM filtration with Cu-HHTP@CuO nanowire arrays coated copper mesh

Haiyan Li,Haimei Liu,Cheng Qian,Tao Wang,Sheng Wang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-

Developing multifunctional purification systems that combine air filtration and antibacterial functionalityis a challenging task. However, in designing air filtration materials, achieving a balance between filtrationefficiency and pressure drop remains a significant challenge. In this study, we developed anovel filtration material composed of hierarchically 3D Cu-HHTP nanowiskers coated CuO nanowires thatwere grown in-situ on a copper mesh. Benefitted from the intrinsically electrical conductivity of Cu-HHTP, we combined the composite material with external electrical energy for air filtration. By applyinglower electric potential directly (voltage of 5 V), the 3D conductive mesh filter exhibited excellent performancesin terms of the PM2.5 removal efficiency (99.7%), pressure drop (32 Pa at 2 cm s -1), andquality factor (0.187 at 2 cm s -1). Furthermore, after ten cycles of filtration and cleaning, the materialmaintained a high PM removal rate. In addition to its excellent filtration performance, the compositemetal mesh also exhibited outstanding antibacterial activity against both E. coli and S. aureus. Theelectro-mechanical stability and recyclability of the composite filter make it a cost-effective and environmentallyfriendly solution for air purification, with promising potential for improving air quality.

A new method based on LPP and NSGA-II for multiobjective robust collaborative optimization

Haiyan Li,Mingxu Ma,Yuanwei Jing 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.5

The multiobjective robust collaborative optimization framework consists of optimization both at the system and autonomous subsystem levels. Linear physical programming is used in the system level optimization, which avoids the difficulty in choosing the multidimensional Pareto set. The non-dominated sorting genetic algorithm (NSGA-II) is used in the subsystem optimization with physical objectives. The interdisciplinary incompatibility function and physical objectives have different priority levels. At the first priority level, the best individual should be in the feasible region of the subsystem. At the second priority level, the interdisciplinary incompatibility function of the best individual should be no more than the feasibility threshold. The physical objectives are improved after the achievement of the above levels. A method for producing initial population with feasibility and diversity is proposed to improve the calculation efficiency and accuracy of the subsystem optimization at the first priority level. A method for setting dynamic feasibility threshold is proposed for the non-dominated sorting to help the physical objectives to obtain better solutions at the second priority level. Finally,the results of the speed reducer show that the presented method is efficient.

Tensile Properties of Hybrid Fiber-Reinforced Reactive Powder Concrete After Exposure to Elevated Temperatures

Haiyan Li,Gang Liu 한국콘크리트학회 2016 International Journal of Concrete Structures and M Vol.10 No.1

The paper presents a research project on the tensile properties of RPC mixed with both steel and polypropylene fibers after exposure to 20–900 ℃. The direct and the indirect tensile strength (in bending) were measured through tensile experiment on dog-bone specimens and bending experiment on 40 9 40 9 160 mm prisms. RPC microstructure was analyzed using scanning electron microscope. The results indicate that, steel fibers can significantly improve the tensile performance of hybrid fiber-reinforced RPC, whereas polypropylene fibers have no obvious effect on the tensile performance. With increasing temperature, the flexural and axial tensile strength of hybrid fiber-reinforced RPC substantially decrease linearly, which attributes to the deteriorating microstructure. Based on the experimental results, equations are established to express the decay of the flexural and tensile strength with increasing temperature.

<i>OsASR5</i> enhances drought tolerance through a stomatal closure pathway associated with ABA and H ₂ O ₂ signalling in rice

Li, Jinjie,Li, Yang,Yin, Zhigang,Jiang, Jihong,Zhang, Minghui,Guo, Xiao,Ye, Zhujia,Zhao, Yan,Xiong, Haiyan,Zhang, Zhanying,Shao, Yujie,Jiang, Conghui,Zhang, Hongliang,An, Gynheung,Paek, Nam‐,Cho John Wiley and Sons Inc. 2017 Plant biotechnology journal Vol.15 No.2

<P><B>Summary</B></P><P>Drought is one of the major abiotic stresses that directly implicate plant growth and crop productivity. Although many genes in response to drought stress have been identified, genetic improvement to drought resistance especially in food crops is showing relatively slow progress worldwide. Here, we reported the isolation of <I>abscisic acid</I>,<I> stress</I> and <I>ripening</I> (<I>ASR</I>) genes from upland rice variety, IRAT109 (<I>Oryza sativa</I> L. ssp. <I>japonica</I>), and demonstrated that overexpression of <I>OsASR5</I> enhanced osmotic tolerance in <I>Escherichia coli</I> and drought tolerance in <I>Arabidopsis</I> and rice by regulating leaf water status under drought stress conditions. Moreover, overexpression of <I>OsASR5</I> in rice increased endogenous ABA level and showed hypersensitive to exogenous ABA treatment at both germination and postgermination stages. The production of H<SUB>2</SUB>O<SUB>2</SUB>, a second messenger for the induction of stomatal closure in response to ABA, was activated in overexpression plants under drought stress conditions, consequently, increased stomatal closure and decreased stomatal conductance. In contrast, the loss‐of‐function mutant, <I>osasr5</I>, showed sensitivity to drought stress with lower relative water content under drought stress conditions. Further studies demonstrated that OsASR5 functioned as chaperone‐like protein and interacted with stress‐related HSP40 and 2OG‐Fe (II) oxygenase domain containing proteins in yeast and plants. Taken together, we suggest that <I>OsASR5</I> plays multiple roles in response to drought stress by regulating ABA biosynthesis, promoting stomatal closure, as well as acting as chaperone‐like protein that possibly prevents drought stress‐related proteins from inactivation.</P>

Effect of Chitosan Coating Fresh-Keeping Agent on Senescence and Membrane Lipid Peroxidation of Postharvest Kumquat Fruits

LI Zhonghai,LI Jilie,Zhong Haiyan 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

The Nonlinear Effect of Industrial Structural Upgrading on Carbon Emission Intensity: An Empirical Analysis of 30 Provinces in China

Li Haiyan,LUO ZHENXING 한국아시아학회 2023 아시아연구 Vol.26 No.4

Given the urgent and disturbing state of global warming, a meticulous investigation into the determinants influencing carbon emission intensity becomes imperative. This paper comprehensively analyzes carbon emission intensity data and its influencing factors from 1997 to 2019 across 30 provinces in China. By constructing a panel dataset and employing the panel threshold model as a methodological tool, our study explores the nonlinear relationship between industrial upgrading and carbon emission intensity within the regional scope of Chinese provinces. Furthermore, in this specific context, our study examines various economic development determinants' impact on carbon emission intensity. Empirical research results indicate that the relationship between China's industrial structure upgrading and carbon emission intensity is rather complex. As the industrial structure continuously upgrades, a U-shaped curve relationship is observed between the two variables. Energy intensity and technological progress exhibit positive impacts of 0.56% and 0.04%, respectively, on carbon emission intensity. In contrast, the inhibitory effect of per capita GDP on carbon emission intensity is 0.17%. Therefore, to achieve low-carbon and sustainable development, the Chinese government must strategically prioritize cultivating high-value-added service sectors in the tertiary industry. Simultaneously, while promoting and developing low-carbon technologies, coordination is necessary to enhance energy-intensive sectors' synchronous enhancement. Additionally, the scope of efforts must also include the systematic decarbonization of the second industry by enhancing energy efficiency and increasing the proportion of clean energy utilization.

OSCILLATION OF SUB LINEAR DIFFERENCE EQUATIONS WITH POSITIVE NEUTRAL TERM

LI, QIAOLUAN,WANG, CHUNGIAO,LI, FANG,LIANG, HAIYAN,ZHANG, ZHENGUO 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.20 No.1

In this paper, we consider the oscillation of first order sublinear difference equation with positive neutral term $\Delta(\chi(n)+p(n)\chi(\tau(n)))+f(n,\chi(g1(n)),\cdots,\chi(gm(n)))=0$. We obtain necessary and sufficient conditions for the solutions of this equation to be oscillatory.

Oscillation of sublinear difference equations withpositive neutral term

Qiaoluan Li,Chunjiao Wang,Fang Li,Haiyan Liang,Zhenguo Zhang 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.20 No.1-2