共查询到20条相似文献，搜索用时 240 毫秒
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对于具有强耦合性和结构复杂性的风氢煤耦合系统，目前学界仅有少数研究从理论阶段证实其可行性，耦合系统的结构及其在实际中的应用路径也缺乏深入分析。为解决能源富集区新能源消纳能力不足的问题，进一步拓展风电利用途径和规模，运用系统动力学理论，分析影响风电功率的不确定性因素，构建风氢煤耦合系统容量优化配置模型。以我国新疆维吾尔自治区为例，基于2010—2020年的相关数据，预测分析其2021—2030年风氢煤耦合系统的动态演化规律，并探讨该系统在经济和技术上的可行性，进而设计在耦合系统内自建和不自建风电场两种方案，对新疆某风电场应用上述优化模型进行验证。结果表明：风氢煤耦合系统容量优化配置模型能有效解决“弃风限电”问题，实现电能长期储存的目标；案例风电场按照风氢煤耦合系统容量优化配置指导CH3OH生产，CH3OH生产商自建风电场成本可减少400万元，负荷弃电率下降32.13%，当风电场容量可信度增加至0.26时，耦合系统无需从大电网购电，可通过储氢罐充放配合来保持H2的稳定供应，规划周期内的碳减排收益可达20.48亿元。实证显示，该改进模型是可行的，在考虑碳减排效益情况下风氢煤耦合系统自建风电场... 相似文献
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发酵产氢的影响因素Ⅱ.反应器类型、营养条件和环境条件 总被引：1，自引：0，他引：1
发酵产氢技术在国内外受到了普遍关注,然该过程是一个极其复杂的生物过程,受诸多因素的干扰.如何优化产氢过程,确保稳定、持续和高效的产氢能力已成为发酵产氢研究的重点课题.本文在查阅了国内外大量文献的基础上,总结了主要影响因子(包括接种物、基质、反应器类型、营养条件和环境条件)对发酵产氢的影响,对发酵产氢朱朱的研发工作提出了... 相似文献
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三株新型发酵产氢菌的分离和不同发酵条件下产氢性能的比较 总被引：1，自引：0，他引：1
氢能是理想的清洁能源,生物制氢技术的研究和开发已成为当前一个研究热点。许多细菌在厌氧条件下发酵复杂的有机化合物,同时产生H2。本文选择了来自同一活性污泥样品的3株有较高产氢能力的发酵细菌,采用生化和电镜技术对其形态学特征进行了观察比较,并进一步比较研究了在不同pH值条件下,它们产氢量、细菌生长量、液相发酵产物组成的变化和差异。获得了三株产氢菌的单位体积培养基最大累积产氢量,提出了纯培养生物制氢的最佳条件,为混合培养生物制氢强化工艺提供参考。 相似文献
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本文用物理检测和电化学等测量方法对多孔镍阴极多孔层的形成过程,析氢机理和降低氢超电位的原因进行了初步探计,以便为多孔镍阴极的应用提供理论依据。 相似文献
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电芬顿法(Electro-Fenton Process)处理废水 总被引：2，自引：0，他引：2
电芬顿法(electro-Fenton)是在Fenton试剂的基础上,在二价铁离子(Fe2+)和过氧化氢(H2O2)作用下,产生强氧化性的羟基自由基(●OH)并由其氧化难降解废水,其中Fe2+和H2O2分别由电化学过程产生。本文概述了电芬顿过程的基本原理,通过介绍国内外电芬顿的发展情况,详细介绍了电芬顿的影响因素,包括pH、阴极电极、催化剂及其他因素等,并展望了其未来的发展方向。 相似文献
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人工湿地基质中土壤酶空间分布及其与水质净化效果之间的相关性 总被引：14，自引：0，他引：14
人工湿地已被广泛用于处理各种类型的废水．研究了人工湿地基质中磷酸酶、脲酶和蛋白酶活性的空间分布规律及与污水净化效果之间的关系．磷酸酶和脲酶的活性随基质深度的增加而降低，蛋白酶活性在基质上层最高，下层次之，中层最低；湿地上池基质磷酸酶、脲酶和蛋白酶活性大于下池．磷酸酶活性与污水总磷、CODcr，BOD5除率正相关；脲酶与总氮的去除率正相关；蛋白酶与总氮、总磷、CODcr,BOD5去除率没有相关性．该研究为利用酶活性作为评价净化效果的指标提供了理论依据。 相似文献
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The cyanobacteria (blue-green algae) are organisms which—using energy from sunlight, water as a source of reductant, and in the presence of simple inorganic salts—can convert nitrogen and carbon dioxide from the atmosphere into cell protein. Under certain conditions they also evolve hydrogen. This reviews considers ways in which cyanobacteria are organised to carry out these processes and the possibilities for turning them to practical use. 相似文献
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This paper investigates the performance of universities in the transfer of technology using a unique university-level dataset for Spain. The results suggest that universities with established policies and procedures for the management of technology transfer perform better. Universities with large and experienced technology transfer offices (TTOs) generate higher volumes of contract research, but the TTO characteristics appear to matter less for university performance in terms of licensing and creation of spin-offs. Furthermore, universities with a science park perform better than those without, which suggests that the agglomeration of knowledge close to universities has a positive effect on universities’ technology transfer performance. 相似文献
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E.W. Tschudi 《Journal of The Franklin Institute》1927,204(2):219-225
A cold cathode discharge tube has an auxiliary tube attached from which cathode-rays are projected against the main cathode. A photo-electric cell, attached to a monochromatic illuminator, is used to measure relative intensity distribution of Hγ and Hδ respectively, from the main cathode through the cathode dark space into the negative glow with and without excitation of the auxiliary tube. When the main cathode is bombarded by the electron stream the intensity of spectral illumination in the negative glow is increased by about 20 per cent. This increase does not result from the mere addition of an illumination, which appears when the auxiliary tube is alone excited, to the illumination of the main discharge, but may be attributed to the production of soft X-rays in the gas which are capable of exciting the gas molecules.R. Seeliger and co-workers have investigated spectrophotometrically the several characteristic sections of a cold cathode discharge tube. Their method consisted of an examination, with a microphotometer, of spectrograms taken at points along the discharge. The intensity distribution of any spectral line was found continuous in passing from one portion of the discharge to another, e.g., from the Faraday dark space into the positive column, and that the maxima of illumination for different lines appeared displaced relative to one another.A. Wehnelt and A. Jachan demonstrated with several experimental arrangements the effect of bombarding the cold cathode of an ordinary discharge tube with a beam of cathode-rays. There resulted an increase in the total intensity of illumination in the tube together with a shrinkage of the cathode dark space.The purpose of the present investigation was to examine the effect such an electronic bombardment would produce upon the spectral intensity distribution near the cathode of a hydrogen discharge in Hγ and Hδ alone were capable of investigation. 相似文献
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BackgroundSynthesis of selenium nanoparticles from selenite by Shewanella sp. HN-41 demonstrated that particle size depended on the reaction time and biomass of cells. The slow reaction and low biomass tended to form small particles. In this study, Shewanella sp. HN-41 was introduced into the anode of a nonexternal circuit bioelectrochemical system (nec_BES) to convert chemical energy from lactate to low electron current to the cathode, where selenite was reduced.ResultsOur experiment with two systems, one bioelectrochemical system with a cathode flushed with nitrogen and the other with a no-nitrogen-flushing cathode, showed that the former could not produce Se nanoparticles after 21 d, but the latter formed them with an average size of 37.7 nm. The SEM and TEM images demonstrated that the particle size of 10 nm occupied over 10% and most of the particles were in the range of 30–60 nm. The XRD result and SAED image demonstrated no clear peaks of crystal and proved that the Se nanoparticles are amorphous.ConclusionsThe clean Se nanoparticles were synthesized and completely separated from bacterial cells in the bioelectrochemical system. This study opened a new approach for the biological synthesis of metal nanoparticles. Finally, the Se products in the range of 30–60 nm can be tested for antimicrobial activities in medical applications.How to cite: Ho CT, Nguyen T-H, Lam T-T, et al. Biogenic synthesis of selenium nanoparticles by Shewanella sp. HN-41 using a modified bioelectrochemical system. Electron J Biotechnol 2021;54. https://doi.org/10.1016/j.ejbt.2021.07.004 相似文献
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研究曝气方式对养鱼水体中生物脱氮的影响规律,实验结果表明,采用曝气的方法,可以有效降低废水中有害的氨氮和亚硝酸盐的浓度,但水体中总氮降低的幅度很小;间歇曝气不利于水体氨氮的快速降低,但是可以有效控制水体中亚硝酸盐和硝酸盐的浓度,其对水体中总氮的去除效率较高,可以达到52%。 相似文献
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从“水—能—碳”关联视角开展城市污水处理系统碳排放研究,有助于揭示污水处理系统中资源的流动、投入过程与碳排放的内在关系机理,并可为城市污水处理系统低碳运行和管理提供重要参考依据。本文基于“水—能—碳”关联的角度,构建了城市污水处理系统碳排放研究的理论框架和方法,以郑州市某污水处理厂为例,评估了污水处理系统运行过程不同环节的碳排放,并对各环节碳排放动态变化的影响因素进行了分析。结果表明：①城市污水处理系统碳排放中,直接碳排放占主导地位,间接碳排放中的能耗和物耗碳排放占比较小;②吨水CH4排放和吨水N2O排放主要受污水处理量和进出水水质浓度（BOD浓度和TN浓度）的影响;③吨水能耗碳排放和吨水物耗碳排放均有呈规模效应的趋势;④城市污水处理系统不同环节碳排放受污水处理工艺、污水处理量、运行工况、进出水水质要求、回用水处理率和能源消耗类型等因素影响。因此,加强城市污水处理系统的资源输入和流通过程的综合管理,推动水、能节约和碳减排的协同对于污水处理系统的低碳运行具有重要意义。 相似文献
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氢能作为实现碳中和目标的重要清洁能源受到了全球瞩目。鉴于美国有逾30年的氢能研发和应用实践经验,文章对美国政府制定的氢能发展规划和战略开展详细调研,分析了自1990年以来的美国氢能战略及发展目标、方向、成效,并重点剖析美国2020年最新氢能发展战略和2021年氢能攻关计划。文章认为,当前美国氢能战略已经从最初建立氢能技术储备和推动氢燃料电池在交通行业的应用,转变为推进碳中和目标下加快氢能全链条、低成本技术开发应用,尤其是绿氢技术的研发和商业化等方向,具有实现碳中和目标、建立和发展氢经济、在全球氢能技术和市场中占主导地位等多元化目标;同时,美国在电解水技术方面具有较为成熟的研发示范经验,未来将向兆瓦级规模和太阳能、核能等可再生能源清洁制氢等方向发展。基于以上研究和分析,文章针对我国氢能战略提出了加强氢能发展顶层设计、攻关突破氢能核心技术、建立氢能全技术链发展模式、加强对外合作、开展标准制定和知识产权保护等建议。 相似文献