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天鹅湖沉积物中解磷菌的解磷能力及其对硬毛藻生长的影响

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生态环境学报 2024年第4期33卷 633-644页

作者：姜晓静谢嘉慧马凯高丽烟台大学海洋学院山东烟台264005

沉积物是维持有害藻华的重要营养来源,其中解磷菌对水体磷的循环起着关键的驱动作用,研究藻华暴发过程中解磷菌与沉积物磷释放的关系具有重要意义。为探讨解磷菌对瀉湖沉积物磷释放以及绿潮硬毛藻(Chaetomorpha sp.)生长的影响,以前期... 详细信息

沉积物是维持有害藻华的重要营养来源,其中解磷菌对水体磷的循环起着关键的驱动作用,研究藻华暴发过程中解磷菌与沉积物磷释放的关系具有重要意义。为探讨解磷菌对瀉湖沉积物磷释放以及绿潮硬毛藻(Chaetomorpha sp.)生长的影响,以前期从天鹅湖分离的2株解有机磷细菌(OPB)(Geobacillus stearothermophilus,Bacillus pumilus)和藻华区沉积物为试材进行室内模拟试验,分析了不同OPB接种条件下上覆水总磷(TP)、可溶性磷(SRP)、硬毛藻生物量以及藻体磷含量等参数的差异,比较了试验前后沉积物碱性磷酸酶活性(APA)及磷赋存形态的变化。结果表明:试验期间不同处理水体TP和SRP含量的变幅分别为0.018-0.621 mg·L^(−1)和0.004-0.376 mg·L^(−1),解磷菌接种明显促进了沉积物磷的释放。无藻条件下,菌液量对水体TP和SRP含量具有极显著影响;各接种组TP含量均表现为高菌量大于低菌量处理,SRP含量在***接种处理的高低菌量间差异较大。试验结束时,接种组沉积物中APA均高于未接种组(差值为0.01-0.81μmol·g^(−1)·h^(−1)),表明OPB可通过分泌碱性磷酸酶等来促进沉积物磷的释放。在大多数处理中,沉积物NH4Cl-P和NaOH-P含量均较初始值有所降低。在***低菌量接种处理中,硬毛藻生长较好,藻体磷含量和磷富集量显著高于其余处理。研究表明,OPB接种能明显促进天鹅湖沉积物磷的释放以及硬毛藻生长,其中***具有较强的碱性磷酸酶分泌能力,且对藻华区沉积物具有较强的解磷能力。从沉积物、解磷菌和大型藻华之间的相互作用关系来看,解磷菌对于近海水体绿潮硬毛藻暴发的影响不容忽视。

关键词：有机解磷菌沉积物磷释放碱性磷酸酶硬毛藻天鹅湖

芽孢杆菌属解磷菌对天鹅湖瀉湖不同类型沉积物的解磷能力

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海洋环境科学 2024年第3期43卷 348-358,367页

作者：谢嘉慧姜晓静马凯高丽烟台大学海洋学院山东烟台264005

磷是海洋浮游植物生长所必需的营养元素,而过量的磷负荷会导致水体富营养化。解磷菌是影响磷再生的一个重要因素,在水体磷的生物地球化学循环中发挥着关键作用。为了研究无机解磷菌(IPB)对天鹅湖瀉湖不同湖区沉积物的解磷能力,本研究以... 详细信息

磷是海洋浮游植物生长所必需的营养元素,而过量的磷负荷会导致水体富营养化。解磷菌是影响磷再生的一个重要因素,在水体磷的生物地球化学循环中发挥着关键作用。为了研究无机解磷菌(IPB)对天鹅湖瀉湖不同湖区沉积物的解磷能力,本研究以前期从湖中心沉积物中筛选的两株芽孢杆菌属(Bacillus sp.)解磷菌及4个湖区的表层沉积物为试验材料,通过室内模拟试验分析了不同解磷菌接种条件下水体pH、DO、总磷(TP)、可溶性磷(SRP)等参数的动态变化,探究了解磷菌对沉积物各形态无机磷转化的影响。结果表明,试验期间,上覆水体DO浓度及pH均呈不同程度的下降趋势,沉积物-水界面很快达到厌氧状态。解磷菌接种促进了天鹅湖沉积物中磷的释放,菌株及湖区的不同均对上覆水体TP浓度有显著影响。试验期间,接种处理的上覆水体SRP浓度变幅为0.009~0.666 mg/L;两种菌株对不同湖区沉积物的解磷能力存在明显差异,其中弯曲芽孢杆菌(Bacillus flexus)对西北部湖区沉积物的解磷能力最强,水体中SRP浓度增幅为0.510mg/L;而巨大芽孢杆菌(Bacillus megaterium)对南部湖区砂质沉积物的解磷能力最强,增幅为0.583 mg/L。试验结束时,弯曲芽孢杆菌接种组沉积物中NaOH-P含量均有所下降,降幅为2.49~30.36 mg/kg,其中西北部湖区降幅最大;南部湖区的BD-P含量在不同接种条件下均有所下降,且巨大芽孢杆菌组降幅大于弯曲芽孢杆菌组;其余磷形态的含量变化不明显。研究表明,天鹅湖不同湖区沉积物中无机磷含量差异较大,颗粒较细的湖中心和西北部含量较高。在IPB接种条件下,瀉湖不同湖区沉积物磷的释放能力存在差异,其中西北部湖区沉积物受微生物活性影响最大,解磷菌对该湖区沉积物内源磷释放的贡献不容忽视。

关键词：无机解磷菌磷释放磷形态瀉湖沉积物荣成天鹅湖

OBE理念下地方高校基层教学组织建设路径思考

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邢台学院学报 2024年第3期39卷 122-126页

作者：马军红蒋晓婧邢台学院河北邢台054001 北京理工大学北京100081

基层教学组织是高校落实立德树人根本任务实现内涵式发展的重要载体,其建设和发展状况对学校的教学质量和人才培养水平起着决定性作用。以聚焦学生能力培养为产出导向的OBE理念,强调以学生为中心,关注学生的过程性学习,培养学生达到预... 详细信息

基层教学组织是高校落实立德树人根本任务实现内涵式发展的重要载体,其建设和发展状况对学校的教学质量和人才培养水平起着决定性作用。以聚焦学生能力培养为产出导向的OBE理念,强调以学生为中心,关注学生的过程性学习,培养学生达到预期的能力目标,为地方高校基层教学组织建设提供了新思路、新途径。新时代地方高校深化教学改革要重新审视基层教学组织的作用。通过更新发展基层教学组织建设理念,回归教学本位,扩大自主权,充分发挥组织管理职能,顺应高等教育改革趋向,为推动地方高校教育高质量发展保驾护航,切实肩负起新时代教育改革的重任。

关键词： OBE理念基层教学组织建设路径

基于经验挖掘与混合语言的海上风电制氢加氢港口选址研究

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中国电力 2024年第9期57卷 113-123页

作者：黄宁泊高建伟许传博徐选华赵舒通缑迅杰姜晓静华北电力大学经济与管理学院北京102206 中南大学商学院湖南长沙410083 四川大学商学院四川成都610065

为辅助海上风电的加氢制氢港口选址决策问题,提出利用经验挖掘算法和混合语言型术语的多属性决策方法。首先,利用爬虫算法、TextRank算法、Word2Vec算法和Louvain算法对历史经验性文件进行挖掘、排序、构建词对和聚类,从而获取基于经验... 详细信息

为辅助海上风电的加氢制氢港口选址决策问题,提出利用经验挖掘算法和混合语言型术语的多属性决策方法。首先,利用爬虫算法、TextRank算法、Word2Vec算法和Louvain算法对历史经验性文件进行挖掘、排序、构建词对和聚类,从而获取基于经验挖掘的属性集;其次,引入对偶自信语言,云模型和实数等语言术语兼顾定量和定性数据的表达,解决数据集转换失真问题;最后,引入标准化公式处理指标数据,获取综合排序结果,以海上风电的加氢制氢港口选址为案例,验证了方法的科学性和有效性。结果表明,考虑定性及定量评估,基于集中式制氢+液氢+购买/租赁船舶技术方案的选址方案A5综合最优,敏感性分析表明气氢储运技术搭配船舶运输是技术成熟度和经济性方面表现较好的技术方案。

关键词：海上风电制氢加氢经验挖掘对偶自信双层语言云模型

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Study on the hydrogen storage property of(TiZr0.1)xCr1.7-yFeyMn0.3(1.05 ＜ x ＜ 1.2, 0.2 ＜ y ＜ 0.6) alloys

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Progress in Natural Science:Materials International 2018年第4期28卷 470-477页

作者： Jigang Li Li Xu xiaojing jiang Xingguo Li College of Chemistry and Molecular Engineering Peking University Material Laboratory of State Grid Corporation of China State Key laboratory of Advanced Transmission Technology Global Energy Interconnection Research InstituteState Grid Corporation of China

The hydrogen storage of(TiZr0.1)xCr1.7-yFeyMn0.3(1.05 详细信息

The hydrogen storage of(TiZr0.1)xCr1.7-yFeyMn0.3(1.05

关键词： Hydrogen storage alloy Ti-Cr type Laves phase PCT Plasma arc melting

Reversible hydrogenation of AB2-type Zr–Mg–Ni–V based hydrogen storage alloys

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Progress in Natural Science:Materials International 2021年第2期31卷 319-323页

作者： Yong Wu Yuanting Peng xiaojing jiang Hui Zeng Zeyuan Wang Jie Zheng Xingguo Li Beijing National Laboratory for Molecular Sciences (BNLMS) College of Chemistry and Molecular Engineering Peking University Wuhan Institute of Marine Electric Propulsion

The development of hydrogen energy is hindered by the lack of high-efficiency hydrogen storage materials. To explore new high-capacity hydrogen storage alloys, reversible hydrogen storage in AB-type alloy is realized by using A or B-side elemental substitution. The substitution of small atomic-radius element Zr and Mg on A-side of YNiand partial substitution of large atomic-radius element V on B-side of YNialloy was investigated in this study. The obtained ZrMgNi, ZrMgNiV, and ZrMgNiValloys remained single Laves phase structure at asannealed, hydrogenated and dehydrogenated states, indicating that the hydrogen-induced amorphization and disproportionation was eliminated. From ZrMgNito ZrMgNiVwith the increase of the degree of vanadium substitution, the reversible hydrogen storage capacity increased from 0.6 wt%(0.35 H/M) to 1.8 wt%(1.0 H/M),meanwhile the lattice stability gradually increased. The ZrMgNiValloy could absorb 1.8 wt% hydrogen in about 2h at 300 K under 4 MPa Hpressure and reversibly desorb the absorbed hydrogen in approximately 30 min at 473K without complicated activation process. The prominent properties of ZrMgNiVelucidate its high potential for hydrogen storage application.

关键词： Laves phase Hydrogen storage Zr–Mg–Ni–V alloy Reversible hydrogenation Vanadium substitution

In situ surface-confined fabrication of single atomic Fe-N_(4) on N-doped carbon nanoleaves for oxygen reduction reaction

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Journal of Energy Chemistry 2021年第8期30卷 482-491,I0011页

作者： xiaojing jiang Jianian Chen Fenglei Lyu Chen Cheng Qixuan Zhong Xuchun Wang Ayaz Mahsud Liang Zhang Qiao Zhang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China

Controllable fabrication of Fe-N-C based single-atom catalysts(SACs)for enhanced electrocatalytic performance is highly desirable but still ***,an in situ surface-confined strategy was demonstrated for the synthesis of single atomic Fe-N_(4))on N-doped carbon nanoleaves(L-FeNC).The in situ generated Zn3[Fe(CN)6]2 could not only serve as a protection layer against collapse of nanoleaves but also provide abundant Fe source for the formation of Fe-N moieties during pyrolysis,leading to high surface area and high graphitization degree of L-FeNC *** from abundant Fe-N_(4))active sites,enhanced mass and charge transfer,the as-prepared L-FeNC manifested a half-wave potential of 0.89 V for oxygen reduction reaction(ORR)in 0.1 M KOH.A maximum power density of 140 m W cm^(-2)and stable discharge voltage even after operation for 50,000 s have been demonstrated when the L-FeNC was used as air cathode for Zn-air *** work not only provided a unique surfaceconfined strategy for the synthesis of two-dimensional nanocarbons,but also demonstrated the significant benefit from rational design and engineering of Fe-N-C SACs,thus offering great opportunities for fabrication of efficient energy conversion and storage devices.

关键词： Single atom catalyst Iron-nitrogen-carbon Surface confine Oxygen reduction reaction Metal-organic frameworks

Experimental investigation and thermodynamic assessment of the yttrium-hydrogen binary system

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Progress in Natural Science:Materials International 2018年第3期28卷 332-336页

作者： Kai Fu xiaojing jiang Yanru Guo Shuan Li Jie Zheng Wenhuai Tian Xingguo Li Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing National Laboratory of Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking University

A coupled experimental investigation and thermodynamic study of the yttrium-hydrogen(Y-H) binary system were carried out to provide more comprehensive and quantitative insights into the key thermodynamic properties of this system. Y-H system in the full range of H/Y = 0–3.0 was investigated by accurate pressure composition isotherm(PCI) measurement to provide credible phase equilibria information and thermodynamic *** phase boundaries obtained were in agreement with previous experimental data but with improved *** the guide of the crystal structures, all the solid phases were modelled using the three sublattice model. The Y-H phase diagram and thermodynamic parameters were calculated and assessed with the CALPHAD *** obtained results are in very good agreement with our experimental data and the published data reported in literature. The obtained thermodynamic database of Y-H system can be used to predict the hydrogenation behavior and decomposition temperatures of hydrides.

关键词： Rare earth Yttrium Hydrogen Pressure composition isotherm Phase diagram Thermodynamics

Intermetallic PtBi core/ultrathin Pt shell nanoplates for efficient and I stable methanol and ethanol electro-oxidization

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Nano Research 2019年第2期12卷 429-436页

作者： Xiaolei Yuan xiaojing jiang Muhan Cao Lei Chen Kaiqi Nie Yong Zhang Yong Xu Xuhui Sun Yanguang Li Qiao Zhang Institute of Functional Nano and Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices SWC for I Synchrotron Radiation Research Soochow University 199 Renai Road Suzhou 215123 China

The development of Pt-based core/shell nanoparticles represents an emerging class of electrocatalysts for fuel cells, such as methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR). Here, we present a one-pot synthesis approach to prepare hexagonal PtBi/Pt core/shell nan ostructure composed of an in termetallic PtiBii core and an ultrathi n Pt shell with well-defined shape, size, and *** structure and the synergistic effect among different components enhanced their MOR and EOR performanee. The optimized Pt2Bi nanoplates exhibit excellent mass activities in both MOR (4,820 mA·mgpt^-1) and EOR (5,950 mA·mgpt^1) conducted in alkaline media, which are 6.15 times and 8.63 times higher than those of commercial Pt/C, respectively. Pt2Bi nan opiates also show superior operati on durability to commercial Pt/C. This work may inspire the rational design and synthesis of Pt-based nanoparticles with improved performance for fuel cells and other applications.

关键词： intermetallics nanoplates core-shell structure methanol oxidation reaction ethanol oxidation reaction