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基于固定化金属亲和整体柱的痕量微囊藻毒素富集分析

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分析测试学报 2025年第1期44卷 155-162,171页

作者：陈小燕杨玲苏立燊吴晓苹福州大学化学学院食品安全与生物分析教育部重点实验室福建福州350116 泉州市晋江环境监测站福建泉州362200 福建省妇幼保健院福建福州350001

基于固定化金属亲和色谱(IMAC)识别原理,采用后修饰法在热引发自由基聚合反应得到的有机基质整体柱上直接固定Cu^(2+),设计并合成表征了poly(VIM-co-DVB)-Cu^(2+)亲和毛细管整体柱,用于微囊藻毒素(MCs)的富集研究。详细优化了亲和整体... 详细信息

基于固定化金属亲和色谱(IMAC)识别原理,采用后修饰法在热引发自由基聚合反应得到的有机基质整体柱上直接固定Cu^(2+),设计并合成表征了poly(VIM-co-DVB)-Cu^(2+)亲和毛细管整体柱,用于微囊藻毒素(MCs)的富集研究。详细优化了亲和整体柱的萃取条件,在最优条件下,将poly(VIM-co-DVB)-Cu^(2+)整体柱用于毛细管微萃取(CME),并与高效液相色谱-质谱(HPLC-MS)检测技术联用,建立了环境水样品中3种MCs的高效富集分析方法。方法检出限为0.89~1.23 ng/L,加标回收率为80.0%~105%,相对标准偏差(RSD)不大于6.8%。该方法灵敏度高、准确性好,可为污染水体中微囊藻毒素的监测分析提供有效手段。

关键词：微囊藻毒素固定化金属亲和整体柱毛细管微萃取高效液相色谱-质谱

基于电路理论的岷江流域生态安全格局构建研究

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水土保持研究 2025年第2期32卷 263-275页

作者：杨艳萍干晓宇吴潇四川大学建筑与环境学院成都610065

[目的]精准提取各生态空间要素,构建生态安全格局,维持流域生态系统的健康稳定及生态环境保护的可持续发展。[方法]以岷江流域为研究区,评估其生态系统服务重要性以筛选生态源地,通过地质灾害敏感性评价修正土地利用基本阻力面,并基于... 详细信息

[目的]精准提取各生态空间要素,构建生态安全格局,维持流域生态系统的健康稳定及生态环境保护的可持续发展。[方法]以岷江流域为研究区,评估其生态系统服务重要性以筛选生态源地,通过地质灾害敏感性评价修正土地利用基本阻力面,并基于电路理论,量化识别廊道、夹点、障碍点等生态空间要素,构建生态安全格局。[结果](1)面积阈值设定为7 km^(2)时,筛选出生态源地77个,面积占比为30.77%,关键生态源地主要在“龙门—邛崃山脉”及其以北的岷山中南段雪宝顶等林地区,以及岷江中下游的部分耕地和林地。(2)生态廊道共176条,总长度2 072.96 km,关键生态廊道总长度占比为21.32%,集中在岷江中游;生态夹点共719处,总面积1 578.5 km^(2);生态障碍点163处,总面积2 410 km^(2)。(3)构建“四区两带一廊”的岷江流域生态安全格局,并以岷江乡为例,探索了岷江流域“全流域—局域单元”生态空间协同修复路径。[结论]生态修复时要考虑多尺度格局的衔接与融合,实行系统性、差异化的生态空间分区治理,提升生态景观连通性及生境质量,促进物质流通。

关键词：生态安全格局生态修复电路理论生态系统服务地质灾害敏感性岷江流域

Modification of FGD gypsum in hydrothermal mixed salt solution

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Journal of Environmental Sciences 2006年第1期18卷 170-175页

作者： wu xiao-qin wu Zhong-biao Department of Environmental Engineering Zhejiang University Hangzhou 310027 China Department of Chemical Engineering Wuhan University of Science and Technology Wuhan 430081 China

A novel utilization way of the sludge from wet calcium-based flue gas desulfurization （FGD） processes has been developed in this paper. This study focused on the conversion of the FGD gypsum into α-hemihydrate calcium sulfate by a hydrothermal salt solution method at atmospheric pressure. Experimental study has been carried out in a batch reactor. Qualitative and quantitative analyses were made by DSC/TG thermal analysis, SEM, XRD, metalloscope and chemical analysis. The experimental results showed that the modification of FGD gypsum was controlled by the dissolution and recrystallization mechanisms. With the introduction of FGD gypsum the salt solution was supersaturated, then crystal nucleus of α-hemihydrate calcium sulfate were produced in the solution. With the submicroscopic structure of FGD gypsum crystal changed, the crystal nucleus grew up into α-hemihydrate calcium sulfate crystals. Thus ,the modification of FGD gypsum was fulfilled.

关键词： FGD gypsum modification hydrothermal mixed salt solution atmospheric pressure

Collisions Between Lumps/Rogue Waves and Solitons for A(3+1)-Dimensional Generalized Variable-Coefficient Shallow Water Wave Equation

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China Ocean Engineering 2022年第5期36卷 808-813页

作者： wu xiao-yu DU Zhong School of Science Beijing Forestry UniversityBeijing 100083China Department of Mathematics and Physics North China Electric Power UniversityBaoding 071003China

In this paper,we investigate a(3+1)-dimensional generalized variable-coefficient shallow water wave equation,which can be used to describe the flow below a pressure surface in oceanography and atmospheric *** the Kadomtsev−Petviashvili hierarchy reduction,we obtain the semi-rational solutions which describe the lumps and rogue waves interacting with the kink *** find that the lump appears from one kink soliton and fuses into the other on the x−y and x−t ***,on the x−z plane,the localized waves in the middle of the parallel kink solitons are in two forms:lumps and line rogue *** effects of the variable coefficients on the two forms are *** dispersion coefficient influences the speed of solitons,while the background coefficient influences the background’s height.

关键词： variable-coefficient shallow water wave equation lumps linear rogue waves Kadomtsev-Petviashvili hierarchy reduction

Diurnal and seasonal variation of glacier meltwater hydrochemistry in Qiyi glacierized catchment in Qilian Mountains, Northwest China: implication for chemical weathering

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Journal of Mountain Science 2018年第5期15卷 1035-1045页

作者： wu xiao-bo State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences

In glacierized catchments, glacier runoff typically shows a strong diurnal cycle in the ablation season(June-September). To elucidate the effect of these processes on the chemical weathering, fresh snowfall and water samples were collected and studied from the supraglacial river, proglacial river,and gauging site in Qiyi glacierized catchment Qilian Mountains, Northwestern China, in the summer of2011. The pH and electronic conductivity(EC) were determined in the field, and the concentrations of major ions(Na^+, K^+, Mg^(2+), Ca^(2+), Cl^-, SO_4^(2-), NO_3^-) were measured. The results indicated that EC linearly increased with increasing distance from the glacial snout, and the concentrations of major ions increased with increasing water-rock interaction time. Along the flow path of the glacier runoff, Na^+ and Cl^-are more concentrated than other ions in the supraglacial river while Mg^(2+) and SO_4^(2-)are more concentrated than other ions at the gauging site. The discharge, pH, EC,and the concentrations of major ions exhibited significant diurnal variation along the flow path. On the other hand, the amplitude of variation diminished from upstream to downstream along the flow *** chemical weathering rate(Na^++K^++Mg^(2+)+Ca^(2+))was determined to be 10.9 t/yr/km^2. Moreover,further research indicated that the sampling method influenced the assessment of chemical weathering rates. When the sample was collected randomly in one diurnal cycle of hydrography, the estimated ionic flux could deviate-47%~73% based on estimated hourly data. In contrast, if three samples were collected at peak, base flow and the discharge decreasing rate starts to slow down in one diurnal cycle of hydrography, respectively, the deviation would be less than 15%. The smaller the diurnal variation of discharge, the smaller deviation calculated.

关键词： Diurnal variation Hydrochemistry Chemical weathering rate

Convergence of Markov decision processes with constraints and state-action dependent discount factors

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Science China Mathematics 2020年第1期63卷 167-182页

作者： xiao wu Xianping Guo School of Mathematics and Statistics Zhaoqing UniversityZhaoqing 526061China School of Mathematics Sun Yat-sen UniversityGuangzhou 510275China

This paper is concerned with the convergence of a sequence of discrete-time Markov decision processes(DTMDPs)with constraints,state-action dependent discount factors,and possibly unbounded *** the convex analytic approach under mild conditions,we prove that the optimal values and optimal policies of the original DTMDPs converge to those of the"limit"***,we show that any countablestate DTMDP can be approximated by a sequence of finite-state DTMDPs,which are constructed using the truncation ***,we illustrate the approximation by solving a controlled queueing system numerically,and give the corresponding error bound of the approximation.

关键词： discrete-time Markov decision processes state-action dependent discount factors unbounded costs convergence

Nonlocality and Entanglement

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Communications in Theoretical Physics 2007年第4期47卷 617-620页

作者： wu xiao-Hua Department of Physics Sichuan University Chengdu 610064 China

By constructing a series of mixture, which is inseparable but satisfies the Mermin-Klyshko inequality, for the N-qubit system, we prove that ＂violation of the Mermin-Klyshko inequality＂ is not equivalent to ＂the st... 详细信息

关键词： nonlocality entanglement

Nonlocality Proof for Two-Particle Systems in 33 Hilbert Space

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Communications in Theoretical Physics 2001年第10期36卷 395-398页

作者： wu xiao-Hua Department of Physics and Center for Theoretical Physics Nanjing University Nanjing 210093 China Department of Physics Sichuan University Chengdu 610064 China

For a two-particle system in 3 3 Hilbert space, we derive a new type of inequality for local hidden variable model. Using an entangled state, we give a realizable experiment whose joint probabilities violate the inequ... 详细信息

关键词： 3 ⊗ 3 Hilbert space Nonlocality

Discrete AKNS-D Hierarchy

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Communications in Theoretical Physics 2007年第3期47卷 385-389页

作者： wu xiao-Ning Institute of Applied Mathematics Academy of Mathematics and System Sciences the Chinese Academy of SciencesP.O. Box 2734 Beijing 100080 China

In this paper, we consider the discrete AKNS-D hierarchy, make the construction of the hierarchy, prove the bilinear identity and give the construction of the τ-functions of this hierarchy.

关键词： discrete integrable system AKNS-D hierarchy