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Tungsten 2024年第3期6卷 529-535页

作者： Min Xing xiao-Ying Ji Shu-xia liu Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education Department of Chemistry Northeast Normal UniversityChangchun 130024China

SO_(x) from fuel oil has caused much air ***,the desulfurization of fuel oil is *** desulfurization(ODS),as one of the most efficient nonhydrodesulfurization technologies,has become a major solution of desulfurization for fuel oil owing to its high reactivity for the removal of refractory organic sulfur compounds including dibenzothiophene(DBT)and its derivatives under mild reaction conditions[1].

关键词： substituted oxidative vanadium

Integrative transcriptome,proteome,and microRNA analysis reveals the effects of nitrogen sufficiency and deficiency conditions on theanine metabolism in the tea plant(Camellia sinensis)

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Horticulture Research 2020年第1期7卷 1865-1877页

作者： Zhi-Wei liu Hui Li Jie-xia liu Yu Wang Jing Zhuang Tea Science Research Institute Ministry of Agriculture and Rural Affairs Key Laboratory of Biology and Germplasm Enhancement of Horticultural Crops in East ChinaCollege of HorticultureNanjing Agricultural University210095 NanjingChina State Key Laboratory of Crop Genetics and Germplasm Enhancement Nanjing Agricultural University210095 NanjingChina

Nitrogen(N)is associated with amino acid metabolism in higher *** is an important amino acid in tea *** explore the relationship between theanine metabolism and N conditions,we examined the differentially expressed genes(DEGs),proteins(DEPs),and microRNAs(DEMs)involved in theanine metabolism in tea plant shoots and roots under N sufficiency and deficiency ***,proteome,and microRNA analyses were performed on tea plant shoots and roots under N sufficiency and deficiency *** contents of theanine,expression levels of genes involved in theanine metabolism,contents of proteinogenic amino acids,and activity of enzymes were *** DEP–DEG correlation pairs and negative DEM–DEG interactions related to theanine metabolism were identified based on correlation *** expression profiles of DEGs and negative DEM–DEG pairs related to theanine biosynthesis were consistent with the sequencing *** results suggest that the molecular and physiological mechanism of theanine accumulation is significantly affected by N sufficiency and deficiency *** DEGs,DEPs,and DEMs and the activity of the enzymes involved in theanine biosynthesis might play vital roles in theanine accumulation under N sufficiency and deficiency conditions in the shoots and roots of tea plants.

关键词： metabolism sinensis ani

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Journal of Forestry Research 2018年第4期29卷 930-938页

作者： Xuanxuan xia Kexiang Gao xianshuang Xing Rui Yang Shuyong Zhang Zilong Du Jing Guo xia liu Shandong Provincial Key Laboratory of Soil Erosion and Ecological Restoration Taishan Forest Eco-station of State Forestry Administration Forestry College of Shandong Agricultural University Tai'an 271018 Shandong People's Republic of China Jiangsu Post and Telecommunications Planning and Designing Institute Co. Ltd. Nanjing 210037 People's Republic of China College of Plant Protection Brief of Shandong Agricultural University Tai'an 271018 Shandong People's Republic of China Hydrographic Office of Shandong Province Jinan 250002 People's Republic of China Jiangsu Key Laboratory of Soil and Water Conservation and Ecological Restoration Collaborative Innovation Center of Sustainable Forestry in Southern China of Jiangsu Province Forestry College of Nanjing Forestry University Nanjing 210037 People's Republic of China

Previous studies showed that Chaetomium globosum ND35 fungus fertilizer can improve the microbial community structure and enzyme activities of replanted soil. However, it remains unclear whether can improve the physiological and ecological characteristics of plants under successive rotation. In this study, we investigated the photosynthetic, physiological, and biochemical indexes including photosynthetic parameters, chlorophyll fluorescence, and chlorophyll content of 1-yeax-old poplar seedlings under seven different doses （range from 0 to 1.67 g kg-1） of C. globosum ND35 fungus fertilizer to study the effects of fungus fertilizer on photosynthesis of Poplar. Our results showed that：（1） With increasing application of fungus fertilizer in replanted soil, chlorophyll content of poplar leaves （Chl） increased, while physiological indexes such as electron transport rate （ETR）, net photosynthetic rate （Pn）, quantum efficiency （φ）, nitrate reductase （NR） activity and root vigor initially increased and then declined. Meanwhile, heat dissipation that depended on the xanthophyll cycle declined and nonphotochemical quenching （NPQ） initially increased and then decreased. When the dose of C. globosum ND35 fungus fertilizer was 0.67 g kg-1 （T3） and 1.00 g kg-1 （T4）, excess light energy of photosynthetic apparatus was reduced, and photosynthetic apparatus distributed more light energy to the direction of photochemical reactions, which improved the efficiency of energy use. Plant height and biomass of leaves, stems, and roots were maximum at T3. We conclude that applying appropriate amounts of C. globosum ND35 fungus fertilizer can improve root physiological activity and capacity for use of light by poplar leaves. This can improve the operating states of the photosynthetic apparatus and lead to increased photosynthetic efficiency of poplar leaves and accumulation of dry *** suggests a strategy to alleviate the successive rotation obstacle of soil nutrient depletion.

关键词： Poplar Successive rotation Chaetomiumglobosum ND35 Photosynthesis Light use efficiency

Influence of α-Al_2O_3 and AlF_3 on pyrohydrolysis of Li_3AlF_6

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Nuclear Science and Techniques 2018年第9期29卷 148-156页

作者： Jia Peng xiao-Bei Zheng Yu-xia liu Lan Zhang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China CAS Innovative Academy in TMSR Energy System Shanghai 201800China

In this study, Li_3AlF_6 was employed to simulate the molten salt LiF–BeF_2 to explore its pyrohydrolysis behavior and that of its components, i.e., LiF and AlF_3,respectively. The influence of the accelerators α-Al_2O_3 and AlF_3 on the pyrohydrolysis of LiF and Li_3AlF_6 was investigated. Finally, the solid pyrohydrolytic products were characterized by means of X-ray diffraction, and the corresponding reaction mechanisms were proposed. These experimental results indicated that AlF_3 was completely hydrolyzed to the corresponding oxide α-Al_2O_3 at 650 ℃ in 1 h, whereas the complete hydrolysis of LiF and Li_3AlF_6 required the assistance of either α-Al_2O_3 or AlF_3 under the same conditions. The influence of the accelerator α-Al_2O_3 and AlF_3 on the pyrohydrolytic behavior of Li_3AlF_6 provides references for future research studies on the pyrohydrolysis of LiF–BeF_2 and multi-component molten salts.

关键词： Pyrohydrolysis Accelerator Li3AlF6 molten salt Reaction mechanism

Study on Low-Temperature Properties of the Asphalt Modified by Carbon Nanotubes(CNTs)and Crumb Rubber(CR)

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China Petroleum Processing & Petrochemical Technology 2022年第1期24卷 36-47页

作者： liu Yumei Zheng Mulian liu xia Wang Chongtao Cheng Yong Wang Ke Key Laboratory for Special Area Highway Engineering of Ministry of Education Chang’an UniversityMiddle Section of South ErhuanXi’an 710064 Jining Hongxiang Highway Survey Design and Research Institute Co.Ltd.Jining 272000 First Highway Consultants Co. Ltd.Xi’an 710075

The effect of adding crumb rubber(CR)and carbon nanotubes(CNTs)on the low-temperature properties of virgin asphalt was *** the force-ductility test and the bending beam rheometer(BBR)test,the deformation resistance and rheological properties of asphalt samples at low temperatures were evaluated,*** on the result of BBR test,the creep functions of the Burgers model and the Zener model were used to fit the low-temperature creep characteristics of the asphalt ***,the differential scanning calorimetry(DSC)test and the attenuated total reflection-Fourier transform infrared spectroscopy(ATR-FTIR)test were utilized to appraise the low-temperature stability and chemical properties of asphalt samples,*** results showed that CR significantly improved the low-temperature properties of virgin asphalt,while CNTs had little ***,during the degradation of CR,aromatic and aliphatic components were *** particular,the aliphatic components of CR-modified asphalt were much higher than those of virgin asphalt,which had a significant effect on improving the low-temperature properties of the *** DSC test results showed that CR enhanced the low-temperature stability of the asphalt,while the addition of CNTs presented a slightly negative effect.

关键词： low-temperature properties crumb rubber(CR) carbon nanotubes(CNTs) creep characteristic asphalt components

Orthogonal array optimization of ionic liquid based dispersive liquid-liquid microextraction for toxic anilines in foods

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Science China Chemistry 2012年第2期55卷 277-284页

作者： YANG Peng REN Haixia WEI Zheng liu xia JIANG Shengxiang Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China Graduate University of the Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100049 China

A simple and rapid method of ionic liquid based dispersive liquid-liquid microextraction （DLLME） combining with high performance liquid chromatography （HPLC） was developed for the analysis of four toxic anilines in flour steamed bread and maize steamed bread. Several possible influential factors such as the type of ionic liquid and disperser solvent, extraction time, sample pH, ionic strength and the volume of ionic liquid and disperser solvent were optimized using single factor experiments and orthogonal array design （OAD） with OA25（54） matrix. Analysis of variance （ANOVA） and percent contribution （PC） were used to investigate the significance of the factors of OAD. Sample pH and ionic strength are statistically demonstrated two chief factors. Under the optimum condition, the method exhibits a good linearity （r2 〉 0.99） over the studied range （50-1000 ng g-l） for anilines. The extraction factors and recoveries for the anilines in two kinds of steamed breads ranged between 34.1%-73.3% and 44.3%-95.3%, respectively. The limit of detections （LODs） and limit of quantitations （LOQs） ranged be- tween 10-15 ng g-1 and 30--45 ng g-1.

关键词： aniline ionic liquid dispersive liquid-liquid microextraction orthogonal array optimization

Characterization of soil low-molecular-weight organic acids in the Karst rocky desertification region of Guizhou Province, China

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Frontiers of Environmental Science & Engineering 2012年第2期6卷 195-203页

作者： xiaoliang LI Kiaomin CHEN xia liu Lianchuan ZHOU Xinqiang YANG College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China College of Urban Construction and Environmental Sciences Anhui Science and Technology UniversityFengyang 233100China

Soil low-molecular-weight （LMW） organic acids play important roles in the soil-forming process and the cycling of nutrients in Karst regions. In this study, we quantified the contents of LMW organic acids （including lactate, acetate, formate, malate, and oxalate） in soil solution over the Karst region of Guizhou Province, China using ion chromatography. The concentration of total LMW organic acids in topsoil solution ranged from 0.358 to 1.823pmol＇g-1, with an average of *** The mean concentrations of lactate, acetate, formate, malate, and oxalate were 0.2124-0.089, 0.3024-0.228, 0.301-4-0.214, 0.014zk0.018 and 0.086＋0.118 pmol.g-% respectively. There were also significant difference in the contents of these acids among four phases of rocky desertification, and their concentrations decreased with the aggravation of rocky desertification. The concentrations of the LMW organic acids were significantly positive correlated each other. Significant positive correlations were also observed among individual LMW organic acids in soil solution, and between them and soil available P, available K, exchange- able Ca, respectively. Furthermore, the concentrations of LMW organic acids were significantly positively corre- lated with inorganic anions （chlorides, nitrates, and sulfates） in Karst topsoil solution. Therefore, the concen- trations of soil LMW organic acids might be one of driving force in the Karst rock desertification process in Guizhou Province.

关键词： Karst rocky desertification low-molecular-weight (LMW) organic acids distribution characteristics,soil

Membrane materials in the pervaporation separation of aromatic/aliphatic hydrocarbon mixtures—A review

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Chinese Journal of Chemical Engineering 2018年第1期26卷 1-16页

作者： Hong-xia liu Naixin Wang Cui Zhao Shulan Ji Jian-Rong Li Beijing Key Laboratory for Green Catalysis and Separation and Department of Chemistry and Chemical Engineering College of Environmental and Energy EngineeringBeijing University of Technology

The separation of aromatic/aliphatic hydrocarbon mixtures is a significant process in chemical industry, but challenged in some cases. Compared with conventional separation technologies, pervaporation is quite promising in terms of its economical, energy-saving, and eco-friendly advantages. However, this technique has not been used in industry for separating aromatic/aliphatic mixtures yet. One of the main reasons is that the separation performance of existed pervaporation membranes is unsatisfactory. Membrane material is an important factor that affects the separation performance. This review provides an overview on the advances in studying membrane materials for the pervaporation separation of aromatic/aliphatic mixtures over the past decade. Explored pristine polymers and their hybrid materials(as hybrid membranes) are summarized to highlight their nature and separation performance. We anticipate that this review could provide some guidance in the development of new materials for the aromatic/aliphatic pervaporation separation.

关键词： Aromatic/aliphatic hydrocarbon mixtures Membrane materials Pervaporation separation

Subnanometric bimetallic Pt-Pd clusters in zeolites for efficient hydrogen production and selective tandem hydrogenation of nitroarenes

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Science China Chemistry 2024年第9期67卷 2911-2917页

作者： Jiafu Li Tao Cai Yanran Feng xia liu Ning Wang Qiming Sun Institute of Sustainable Energy and Resources College of Chemistry and Chemical EngineeringKey Laboratory of Shandong Provincial Universities for Functional Molecules and MaterialsQingdao UniversityQingdao 266071China Innovation Center for Chemical Sciences College of ChemistryChemical Engineering and Materials ScienceJiangsu Key Laboratory of Advanced Negative Carbon TechnologiesSoochow UniversitySuzhou 215123China

The solvolysis of ammonia borane(AB)and the hydrogenation of nitroarenes represent significant reactions for hydrogen generation and value-added chemical *** strategic engineering of the catalysts is imperative for surmounting obstacles associated with their stability and catalytic *** this work,subnanometric bimetallic Pt–Pd clusters were encapsulated within silicalite-1(S-1)zeolites through a ligand-protected in-situ hydrothermal synthesis *** synergetic effect of bimetallic composition and zeolite confinement markedly enhances the catalytic performance of representative Pt_(0.5)Pd_(0.5)@S-1-H catalyst,affording exceptional turnover frequency(TOF)values of 1,043 and 573 mol_(H_(2))mol_(metal)^(-1)min^(-1)for AB hydrolysis and methanolysis at ambient conditions,respectively,surpassing most of the state-of-the-art Pt-based *** and isotopic experiments reveal that the bimetallic catalytic system remarkably boosts the O-H cleavage of water,thereby facilitating the H_(2) production from AB ***,a conspicuous synergistic effect is demonstrated in the shape-selective tandem hydrogenation of nitroarenes,with the bimetallic catalyst facilitating both AB hydrolysis and nitroarene hydrogenation,giving a high TOF value of 1,260 h^(-1)under atmospheric *** study not only demonstrates the effectiveness of bimetallic nanocatalysts encapsulated in zeolites for hydrogen production from chemical hydrogen storage materials,but also paves the way for the design of catalysts with multifunctional active sites capable of synergistically promoting tandem catalytic processes.

关键词： subnanometer bimetallic cluster zeolite synergistic effect ammonia borane solvolysis selective tandem hydrogenation

Recent movement changes of main fault zones in the Sichuan-Yunnan region and their relevance to seismic activity

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Science China Earth Sciences 2016年第6期59卷 1267-1282页

作者： liu xia MA Jin DU XueSong ZHU Shuang LI LaYue SUN DongYing First Crustal Monitoring and Application Center China Earthquake Administration State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake Administration

The Wenchuan earthquake occurred near the "triple junction" linking the Bayan Har block, the South China block, and the Sichuan-Yunnan rhombic block, and its influences on the surrounding blocks and the main fault zones in the Sichuan-Yunnan region, i.e., the block boundary zone, cannot be ignored. In this paper, changes of movement and stress of the fault zones before and after a strong earthquake were simulated based on the GPS repetition survey results recently obtained during 1999–2007, 2009–2011, and 2011–2013 with a two-dimensional finite-element contact model and the "block- loading" method. The results show that, before the Wenchuan earthquake, the movement of the Longmenshan fault zone was very slow and its compressive stress accumulated rapidly; after the Wenchuan earthquake, movements toward the E-SSE direction of the Bayan Har, southwestern Yunnan, and rhombic blocks were enhanced, and the dextral and horizontal compressive speeds and annual accumulative compressive stress of the Longmenshan fault zone increased markedly by factors of 4.5, 2.1, and 2.5, respectively. The southern xianshuihe, Anninghe, Zemuhe, Daliangshan, and Lijiang-xiaojinhe fault zones accumulated compressive stress rapidly, forming enhanced compressive stress zones along a NE strike crossing the central part of the Sichuan-Yunnan region. The tensional movement of the xianshuihe fault zone was enhanced and the slip movement in the central part of the zone was reversed in a short time. The changes are tightly related to the medium-intensity earthquakes that occurred during the same period in this region, revealing that the spatial migration of seismic activity is related to changes of movement of the blocks.

关键词： Sichuan-Yunnan region Wenchuan earthquake Tectonic block Finite-element analysis Fault