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Plant enhanced degradation of phenanthrene in the contaminated soil

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Journal of Environmental Sciences 2006年第3期18卷 510-513页

作者： liao min XIE Xiao-mei School of Environmental and Resources Sciences Zhejiang University Hangzhou 310029 China

The degradative characteristics ofphenanthrene, microbial biomass carbon, plate counts ofheterotrophic bacteria and most probable number （MPN） of phenanthrene degraders in non-rhizosphere or rhizosphere soils with uninoculating or inoculating phenanthrene degraders were measured. At the initial concentration of 20 mg phenanthrene/kg soil, the half-lives of phenanthrene in uninoculated non-rhizosphere soil, uninoculated rhizosphere soil, inoculated non-rhizosphere soil, and inoculated rhizosphere soil were measured to be 81.5, 47.8, 15.1 and 6.4 d, respectively, and corresponding kinetic data fitted first-order kinetics. The highest degradation rate of phenanthrene was observed in inoculated rhizosphere soil. The degradative characteristics of phenanthrene were closely related to the effects of vegetation on soil microbial process. Vegetation could enhance the magnitude of rhizosphere microbial communities, microbial biomass content, and heterotrophic bacterial community, but barely influence those community components responsible for phenanthrene degradation. Results suggested that combination of vegetation and inoculation with degrading microorganisms of target organic contaminants was a better pathway to enhance degradation of the organic contaminants in soil.

关键词： phenanthrene bioremediation degradation

Effects of Organic Acids on Adsorption of Cadmium onto Kaolinite, Goethite, and Bayerite

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Pedosphere 2006年第2期16卷 185-191页

作者： liao min College of Environmental and Resource Sciences Department of Resources Science Zhejiang University Hangzhou 310029 （China）.

Effects of organic acids (oxalic, acetic, and citric) on adsorption characteristics of Cadmium (Cd) on soil clay minerals (kaolinite, goethite, and bayerite) were studied under different concentrations and different pH values. Although the types of organic acids and minerals were different, the effects of the organic acids on the adsorption of Cd on the minerals were similar, i.e., the amount of adsorbed Cd with an initial solution pH of 5.0 and initial Cd concentration of 35 mg L-1 increased with increasing concentration of the organic acid in solution at lower concentrations, and decreased at higher concentrations. The percentage of Cd adsorbed on the minerals in the presence of the organic acids increased considerably with increasing pH of the solution. Meanwhile, different Cd adsorption in the presence of the organic acids, due to different properties on both organic acids and clay minerals, on kaolinite, goethite, or bayerite for different pHs or organic acid concentrations was found.

关键词： adsorption cadmium clay minerals organic acids

Optimization of ferroelectricity and endurance of hafnium zirconium oxide thin films by controlling element inhomogeneity

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Journal of Advanced Ceramics 2024年第7期13卷 1023-1031页

作者： Fei Yan Ke Cao Yang Chen Jiajia liao min liao Yichun Zhou Shaanxi Key Laboratory of High-Orbits-Electron Materials and Protection Technology for Aerospace School of Advanced Materials and NanotechnologyXidian UniversityXi’an 710126China Xi’an Key Laboratory of Reconfigurable Chip and Materials School of Advanced Materials and NanotechnologyXidian UniversityXi’an 710126China Frontier Research Center of Thin Films and Coatings for Device Applications Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’an 710126China

Ferroelectric thin films based on HfO_(2) have garnered increasing attention worldwide,primarily due to their remarkable compatibility with silicon and scalability,in contrast to traditional perovskite-structured ferroelectric ***,significant challenges remain in their widespread commercial utilization,particularly concerning their notable wake-up effect and limited *** address these challenges,we propose a novel strategy involving the inhomogeneous distribution of Hf/Zr elements within thin films and explore its effects on the ferroelectricity and endurance of Hf_(0.5)Zr_(0.5)O_(2) thin *** techniques such as grazing incidence X-ray diffraction,transmission electron microscopy,and piezoresponse force microscopy,we investigated the structural characteristics and domain switching behaviors of these *** experimental results indicate that the inhomogeneous distribution of Hf/Zr contributes to improving the frequency stability and endurance while maintaining a large remnant polarization in Hf_(0.5)Zr_(0.5)O_(2) ferroelectric thin *** adjusting the distribution of Zr/Hf within the Hf_(0.5)Zr_(0.5)O_(2) thin films,significant enhancements in the remnant polarization(2P_(r)>35μC/cm2)and endurance(>109)along with a reduced coercive voltage can be ***,the fabricated ferroelectric thin films also exhibit high dielectric tunability(≥26%)under a low operating voltage of 2.5 V,whether in the wake-up state or *** study offers a promising approach to optimize both the ferroelectricity and endurance of HfO_(2)-based thin films.

关键词： ferroelectric capacitors thin films ferroelectricity hafnium zirconium oxide

Adaptive sampling immune algorithm solving joint chance-constrained programming

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控制理论与应用（英文版） 2013年第2期11卷 237-246页

作者： Zhuhong ZHANG Lei WANG min liao Institute of System Science & Information Technology College of Science Guizhou University

This work investigates one immune optimization algorithm in uncertain environments, solving linear or nonlinear joint chance-constrained programming with a general distribution of the random vector. In this algorithm, an a priori lower bound estimate is developed to deal with one joint chance constraint, while the scheme of adaptive sampling is designed to make empirically better antibodies in the current population acquire larger sample sizes in terms of our sample-allocation rule. Relying upon several simplified immune metaphors in the immune system, we design two immune operators of dynamic proliferation and adaptive mutation. The first picks up those diverse antibodies to achieve proliferation according to a dynamical suppression radius index, which can ensure empirically potential antibodies more clones, and reduce noisy influence to the optimized quality, and the second is a module of genetic diversity, which exploits those valuable regions and finds those diverse and excellent antibodies. Theoretically, the proposed approach is demonstrated to be convergent. Experimentally, the statistical results show that the approach can obtain satisfactory performances including the optimized quality, noisy suppression and efficiency.

关键词： Joint chance-constrained programming Immune optimization Adaptive sampling Reliability domi-nance Noisy attenuation

Effect of heavy metals on soil microbial activity and diversity in a reclaimed mining wasteland of red soil area

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Journal of Environmental Sciences 2005年第5期17卷 832-837页

作者： liao min CHEN Cheng-li HUANG Chang-yong College of Environmental and Resources Sciences Zhejiang University Hangzhou 310029 China

The microbial biomass, basal respiration and substrate utilization pattern in copper mining wasteland of red soil area, southern China, were investigated. The results indicated that soil microflora were obviously different compared with that of the non-mine soil. Microbial biomass and basal respiration were negatively affected by the elevated heavy metal levels. Two important microbial ecophysiological parameters, namely, the ratio of microbial biomass C（ Cmic ）/organic C（ Corg ） and metabolic quotient（qCO2 ） were closely correlated to heavy metal stress. There was a significant decrease in the Cmic/Corg ratio and an increase in the metabolic quotient with increasing metal concentration. Multivariate analysis of Biolog data for sole carbon source utilization pattern demonstrated that heavy metal pollution had a significant impact on microbial community structure and functional diversity. All the results showed that soil microbiological parameters had great potential to become the early sensitive, effective and liable indicators of the stresses or perturbations in soils of mining ecosystems.

关键词： reclaimed mining wasteland soil microorganism soil microbial diversity

Discrete micropayment protocol based on master-slave payword chain

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The Journal of China Universities of Posts and Telecommunications 2007年第1期14卷 58-60,84页

作者： FAN Li-min liao Jian-xin State Key Laboratory of Net Studying and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

Using the idea of Payword, the new concept of master-slave payword chain （MSPC） is proposed in this article. MSPC consists of one master payword chain and one slave payword chain. On the basis of MSPC, a new micropayment protocol called discrete micropayment protocol （DMP）, is presented in this article. DMP consists of three sub-protocols： registration, payment, and settlement. Both part fairness and non-unit-wise payment can be provided by DMP.

关键词： payword micropayment fairness unit-wise payment

Adsorption of Metsulfuron and Bensulfuron on a Cationic Surfactant-Modified Paddy Soil

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Pedosphere 2007年第1期17卷 101-108页

作者： liao min XIE Xiao-Mei College of Environmental and Resource Sciences Department of Resources Science Zhejiang University Hangzhou 310029 （China）

Adsorption isotherms of metsulfuron and bensulfuron on a hexadecyltrimethylammonium （HDTMA） bromide-modified paddy soil under different ionic strengths, with divalent cation Cu^2＋, or having different pH were studied to describe their adsorptive behavior, and to try to explain the adsorption process of a sulfonylurea compound with a carbamoylsulfamoyl group in the modified soil environment. All the adsorption isotherms fitted the Freundlich equation well, and the HDTMA treatment of paddy soil dramatically enhanced adsorption capacity of metsulfuron or bensulfuron. Also, an increase of ionic strength and the addition of divalent heavy metal cation Cu^2＋ on the HDTMA-modified paddy soil increased the adsorption of metsulfuron or bensulfuron. Additionally, for metsulfuron and bensulfuron in the aqueous phase, adsorption capacity of the HDTMA-modified paddy soft gradually increased with decreasing pH.

关键词： adsorption bensulfuron cationic surfactant metsulfuron paddy soil

Identifying the effect of photo-generated carriers on the phonons in rutile TiO_(2) through Raman spectroscopy

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Chinese Physics B 2024年第11期33卷 422-428页

作者： Zheng Wang min liao Guihua Wang Meng Zhang School of Electronic and Information Engineering Beihang UniversityBeijing 100191China

Investigating lattice vibrations through Raman spectroscopy is a crucial method for studying crystalline *** can interact with lattices and influence lattice vibrations;thus,it is feasible to study the effect of photo-generated carriers on phonons by analyzing changes in the Raman spectra of *** is one of the predominant crystalline phases of TiO_(2),which is a widely utilized metal oxide *** this work,rutile TiO_(2) is coated on a thinned optical fiber to concentrate ultraviolet light energy within the material,thereby enhancing the generation of carriers and amplifying the changes in the Raman spectra.A Raman detection laser with a wavelength of 532 nm is utilized to collect the Raman spectra of rutile TiO_(2) during *** this setup,the impact of photo-generated carriers on the phonons corresponding to Raman vibrational modes is *** localization and non-radiative recombination of photo-generated carriers contribute to a reduction in both the frequencies and lifetimes of *** work provides a novel approach to researching the effect of carriers on phonons.

关键词： Raman spectroscopy photo-generated carriers rutile TiO_(2) phonons

Structural Characterization and Retention Time Simulation of Allergenic Fragrances

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Chinese Journal of Structural Chemistry 2020年第10期39卷 1753-1762,1741页

作者： LI Jian-Feng liao Li-min College of Chemistry and Chemical Engineering Neijiang Normal UniversityNeijiang 641100China Key Laboratory of Fruit Waste Treatment and Resource Recycling Neijiang 641100China

By classifying non-hydrogen atoms of organic compounds,parametric dyeing,and establishing the relationship between non-hydrogen atoms,new structure descriptors were *** structures of 48 common allergenic fragrance organic compounds were parametrically *** multiple linear regression(MLR)and partial least-squares regression(PLS)methods were used to build two models of relationship between the compound structure and chromatographic retention *** stability of the models was evaluated by the"leave-one-out"cross test,and the predictive ability of the models was tested using an external sample *** correlation coefficients(R2)of the two models are 0.9791 and 0.9744,those(R(CV)~2)of the cross test are 0.8542 and 0.7464,and those(R(test)~2)of the external prediction are 0.9802 and 0.9367,indicating that the models built have good fitting ability,stability and external forecasting *** structural factors affecting the chromatographic retention time of the compounds were *** results show that the compound with more secondary carbon atoms may have larger chromatographic retention time(tR)*** paper has certain reference value for the study on the relationship between the structures and properties of allergenic fragrance organic compounds.

关键词： allergenic fragrance structure descriptor structure characterization simulation prediction