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内酯型槐糖脂促进HCFC-141b水合物生成

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化工进展 2024年第3期43卷 1199-1205页

作者：黄梦孙志高徐文超张焕然杨扬苏州科技大学环境科学与工程学院江苏苏州215009

蓄冷空调是降低电网峰谷差、实现电网负载侧调峰的一种重要手段,制冷剂水合物作为蓄冷介质具有蓄冷密度大和相变温度高的优点。HCFC-141b制冷剂是一种潜在的蓄冷物质,为了促进HCFC-141b制冷剂水合物的生成,实验研究了绿色环保表面活性... 详细信息

蓄冷空调是降低电网峰谷差、实现电网负载侧调峰的一种重要手段,制冷剂水合物作为蓄冷介质具有蓄冷密度大和相变温度高的优点。HCFC-141b制冷剂是一种潜在的蓄冷物质,为了促进HCFC-141b制冷剂水合物的生成,实验研究了绿色环保表面活性剂槐糖脂对HCFC-141b水合物生成的影响。研究结果表明,添加适量的内酯型槐糖脂可大幅度缩短HCFC-141b水合物形成的诱导时间。槐糖脂的添加量影响水合物的成核和生长过程,质量分数为0.5%是内酯型槐糖脂的最佳浓度,促进HCFC-141b水合物生成的平均诱导时间最短,约为153min。实验结果还表明水合物的生成具有随机性,添加内酯型槐糖脂可以改善水合物生成的随机性,0.5%(质量分数)的内酯型槐糖脂的诱导时间标准方差最小,水合物成核稳定性最好。内酯型槐糖脂的添加也影响HCFC-141b水合物的蓄冷量,当添加0.5%(质量分数)的内酯型槐糖脂时,HCFC-141b水合物的平均蓄冷量达到232.45kJ/kg。

关键词：水合物表面活性剂动力学制冷剂蓄冷内酯型槐糖脂

碳化物纳米流体促进制冷剂水合物生成试验研究

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低温与超导 2024年第1期52卷 65-72页

作者：胡鹏飞李娟孙志高苏州科技大学环境科学与工程学院苏州215009

针对制冷剂HCFC-141b(一氟二氯乙烷)水合物生成诱导时间长、随机性高的问题,试验研究了碳化钛(TiC)纳米粒子和表面活性剂十六烷基三甲基溴化铵(CTAB)复配形成的纳米流体对水合物生成的协同促进作用,并通过试验数据计算诱导时间标准差、... 详细信息

针对制冷剂HCFC-141b(一氟二氯乙烷)水合物生成诱导时间长、随机性高的问题,试验研究了碳化钛(TiC)纳米粒子和表面活性剂十六烷基三甲基溴化铵(CTAB)复配形成的纳米流体对水合物生成的协同促进作用,并通过试验数据计算诱导时间标准差、水合物蓄冷量。结果表明,CTAB具有良好的分散性与稳定性,复配体系下纳米流体的促进效果进一步增强,但随着TiC粒径和添加浓度的增大,促进程度均呈现先增强后减弱的特点。TiC纳米粒子的最佳粒径为40 nm,相较于50 nm和30 nm,平均诱导时间分别缩短22.7%和34.8%;最佳添加浓度为120 ppm,平均诱导时间缩短至53.2 min,标准差降低至8.4,最高蓄冷量可达269.9 kJ/kg。碳化物纳米粒子的高表面能和吸附作用为制冷剂水合物的生成提供了大量成核位点,而布朗运动和高导热性可增强传热与传质。

关键词：制冷剂水合物碳化物纳米流体诱导时间蓄冷量表面活性剂

Potential Effects of Episodic Deposition on Nutrients and Heavy Metals in Decomposing Litters of Suaeda glauca in Salt Marsh of the Yellow River Estuary, China

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Chinese Geographical Science 2020年第3期30卷 466-482页

作者： CHEN Bingbing sun zhigao Key Laboratory of Humid Subtropical Eco-geographical Process(Fujian Normal University) Ministry of EducationFuzhou 350007China Institute of Geography Fujian Normal UniversityFuzhou 350007China Fujian Provincial Key Laboratory for Subtropical Resources and Environment Fujian Normal UniversityFuzhou 350007China

Episodic deposition has been recognized as a major factor affecting the decomposition rate of detrital material in salt marshes. In this paper, three one-off burial treatments, no burial treatment(0 cm, NBT), current burial treatment(10 cm, CBT) and strong burial treatment(20 cm, SBT), were designed in intertidal zone of the Yellow River Estuary to determine the potential influences of episodic deposition on nutrient(C, N) and heavy metal(Pb, Cr, Cu, Zn, Ni, Mn, Cd, V and Co) variations in decomposing litters of Suaeda glauca. Results showed that although various burial treatments showed no statistical difference in decomposition rate of S. glauca, the values generally followed the sequence of CBT(0.002 403/d) > SBT(0.002 195/d) > NBT(0.002 060/d). The nutrients and heavy metals in decomposing litters of the three burial treatments exhibited different variations except for N, Cu, Cr, Ni and Co. Except for Mn, no significant differences in C, N, Pb, Cr, Cu, Zn, Ni, V and Co concentrations occurred among the three treatments(P > 0.05). With increasing burial depth, Cr and Cd levels generally increased while Cu, Ni and Mn concentrations decreased. Although episodic deposition was generally favorable for C and N release from S. glauca, its influence on release was insignificant. In the three burial treatments, Pb, Cr, Zn, Ni, Mn, V and Co stocks in S. glauca generally evidenced the export of metals from litter to environment, and, with increasing burial depth, the export amounts increased greatly. The S. glauca were particular efficient in binding Cd and releasing Pb, Cr, Zn, Ni, Mn, V and Co, and, with increasing burial depth, stocks of Cu in decomposing litters generally shifted from release to accumulation. The experiment indicated that the potential eco-toxic risk of Pb, Cr, Zn, Ni, Mn, V and Co exposure would be serious as the strong burial episodes occurred in S. glauca marsh.

关键词： decomposition nutrient and metal episodic deposition Suaeda glauca Yellow River Estuary

静态条件下表面活性剂SG-10对HCFC-141b水合物生成和蓄冷的促进

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储能科学与技术 2024年第8期13卷 2615-2622页

作者：罗洁孙志高李娟李翠敏黄海峰苏州科技大学环境科学与工程学院江苏苏州215009

制冷剂水合物蓄冷是降低电网峰谷差、提高空调经济性的一种新型蓄冷技术。水合物蓄冷相变潜热大,相变温度适宜,有效克服了传统蓄冷介质的缺点。但制冷剂水合物的形成存在诱导时间长和随机性大等问题。为了促进HCFC-141b制冷剂水合物的生... 详细信息

制冷剂水合物蓄冷是降低电网峰谷差、提高空调经济性的一种新型蓄冷技术。水合物蓄冷相变潜热大,相变温度适宜,有效克服了传统蓄冷介质的缺点。但制冷剂水合物的形成存在诱导时间长和随机性大等问题。为了促进HCFC-141b制冷剂水合物的生成,改善水合物蓄冷能力,选择聚氧乙烯型非离子表面活性剂硬脂酸聚氧乙烯酯(SG-10)作为添加剂,研究其对HCFC-141b水合物生成和蓄冷量的影响。SG-10可有效促进水合物生成,添加量是影响其促进效果的重要因素。实验研究4种不同质量浓度的SG-10对水合物生成的影响,当质量浓度为2%时水合物形成稳定性好,生长密实,是该体系最佳添加量,此时水合物形成诱导时间最短(209 min),蓄冷量最大(约为212.8 kJ/kg),水合物生长速率最快[4.09 kJ/(kg·min)]。当表面活性剂SG-10浓度达到一定值时,其会自发缔合生成胶束,为水合物提供成核位点,有助于水合物生成。SG-10在溶液中形成的胶束是促进水合物形成的主要原因。

关键词：水合物诱导时间蓄冷量 HCFC-141b 生长速率

维普期刊数据库博看期刊

黄河口新生湿地土壤中各形态硫的分布特征及其影响因素

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湿地科学 2024年第3期22卷 337-348页

作者：武慧慧孙志高李新华陈冰冰福建师范大学福建省亚热带资源与环境重点实验室福建福州350117 福建师范大学湿润亚热带生态地理过程教育部重点实验室福建福州350117 山东省农业科学院湿地农业与生态研究所山东济南250100 东营黄河三角洲现代农业研究中心山东东营257000

2020年9月,在今黄河入海口北部的新生潮滩区内,在碱蓬(Suaeda salsa)盐沼和柽柳(Tamarix chinensis)盐沼设置采样地,采集不同深度的土壤样品,对比了不同采样地土壤全硫、总无机硫以及各形态无机硫(水溶性硫、吸附性硫、盐酸可溶性硫、... 详细信息

2020年9月,在今黄河入海口北部的新生潮滩区内,在碱蓬(Suaeda salsa)盐沼和柽柳(Tamarix chinensis)盐沼设置采样地,采集不同深度的土壤样品,对比了不同采样地土壤全硫、总无机硫以及各形态无机硫(水溶性硫、吸附性硫、盐酸可溶性硫、盐酸挥发性硫)的分布特征及其影响因素。研究结果表明,碱蓬盐沼和柽柳盐沼0~60 cm深度土壤全硫含量变化在804.96~881.50 mg/kg之间,在中国湿地土壤硫含量整体处于中等水平,大于世界土壤平均硫含量(700 mg/kg);碱蓬盐沼和柽柳盐沼土壤的全硫含量相近,且都在深层(30~60 cm)土壤中含量较大;碱蓬盐沼和柽柳盐沼土壤中总无机硫含量占全硫含量的比例都较大,其值分别变化在24.02%~42.94%和17.53%~29.22%之间;碱蓬盐沼土壤的总无机硫储量约为柽柳盐沼的1.6倍,前者具有较高的供硫水平;碱蓬盐沼土壤中的水溶性硫、吸附性硫和盐酸可溶性硫含量整体都大于柽柳盐沼,盐酸挥发性硫含量则在柽柳盐沼土壤中较大;在垂直方向上,碱蓬盐沼土壤的水溶性硫含量以及碱蓬盐沼和柽柳盐沼土壤中盐酸可溶性硫含量都在浅土层(0~30 cm)较大,而其他形态无机硫含量则在深土层较大;碱蓬盐沼土壤中不同形态硫的分布主要受土壤颗粒组成和土壤有机碳含量影响,而在柽柳盐沼中主要受土壤有机碳含量和氮养分含量影响。

关键词：全硫无机硫碱蓬盐沼柽柳盐沼黄河口

Nitrogen cycle of a typical Suaeda salsa marsh ecosystem in the Yellow River estuary

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Journal of Environmental Sciences 2011年第6期23卷 958-967页

作者： Xiaojie Mou zhigao sun Lingling Wang Chuanyuan Wang Key laboratory of Coastal Environment Processes CAS Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes Yantai Institute of Coastal Zone Research Chinese Academy of Sciences Yantai 264003 China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100039 China

The nitrogen（N） biological cycle of the Suaeda salsa marsh ecosystem in the Yellow River estuary was studied during 2008 to *** showed that soil N had significant seasonal fluctuations and vertical *** N/P ratio（15.73±1.77） of *** was less than 16,indicating that plant growth was limited by both N and *** N absorption coefficient of *** was very low（0.007）,while the N utilization and cycle coefficients were high（0.824 and 0.331,respectively）.The N turnover among compartments of *** marsh showed that N uptake from aboveground parts and roots were 2.539 and 0.622 g/m2,*** N translocation from aboveground parts to roots and from roots to soil were 2.042 and 0.076 g/m2,*** N translocation from aboveground living bodies to litter was 0.497 g/m2,the annual N return from litter to soil was far less than 0.368 g/m2,and the net N mineralization in topsoil during the growing season was 0.033 g/m2.N was an important limiting factor in *** marsh,and the ecosystem was classified as unstable and *** was seemingly well adapted to the low-nutrient status and vulnerable habitat,and the nutrient enrichment due to N import from the Yellow River estuary would be a potential threat to the *** *** nutrient loading might favor invasive species and induce severe long-term degradation of the ecosystem if human intervention measures were not *** N quantitative relationships determined in our study might provide a scientific basis for the establishment of effective measures.

关键词： compartment model nitrogen biological cycle Suaeda salsa Yellow River estuary

Potential Impacts of Exogenous Nitrogen Enrichment on Distribution and Transfer of Nitrogen in Plant-Soil System of Suaeda salsa Marsh in the Yellow River Estuary, China

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Journal of Ocean University of China 2023年第1期22卷 258-270页

作者： HU Xingyun sun zhigao YU Linying CHEN Bingbing Fujian Provincial Key Laboratory for Subtropical Resources and Environment Fujian Normal UniversityFuzhou 350007China Key Laboratory of Humid Subtropical Eco-Geographical Process(Fujian Normal University) Ministry of EducationFuzhou 350007China Institute of Geography Fujian Normal UniversityFuzhou 350007China

To determine the potential impacts of exogenous nitrogen(N)enrichment on distribution and transfer of N in Suaeda salsa marsh in the Yellow River Estuary,the variations of N in plant-soil system during the growing season were investigated by field N addition *** experiment included four treatments:NN(no N input treatment,0gNm^(−2) yr^(−1)),LN(low N input treatment,3.0 gNm^(−2) yr^(−1)),MN(medium N input treatment,6 gNm^(−2) yr^(−1))and HN(high N input treatment,12 gNm^(−2) yr^(−1)).Results showed that N additions generally increased the contents of total nitrogen(TN),ammonia nitrogen(NH_(4)^(+)-N)and nitrate nitrogen(NO_(3)^(−)-N)in different soil layers and the increasing trend was particularly evident in *** with the NN treatment,the average contents of TN in topsoil in the LN,MN and HN treatments during the growing season increased by 10.85%,30.14%and 43.98%,the mean contents of NH_(4)^(+)-N increased by 8.56%,6.96%and 14.34%,and the average contents of NO_(3)^(−)-N increased by 35.73%,45.99%and 46.66%,*** exogenous N import did not alter the temporal variation patterns of TN contents in organs,the N transfer and accumulation differed among tissues in different *** increasing N import,both the N stocks in soil and plant showed increasing trend and the values in N addition treatments increased by 9.43%–38.22%and 13.40%–62.20%,*** was worth noting that,compared with other treatments,the *** in the MN treatments was very likely to have special response to N enrichment since not only the period of peak growth was prolonged by about 20 days but also the maximum of TN content in leaves was advanced by approximately one *** paper found that,as N loading reached MN level in future,the growth rhythm of *** and the accumulation and transference of N in its tissues would be altered significantly,which might generate great impact on the stability and health of *** marsh ecosystem.

关键词： nitrogen import nitrogen transfer plant-soil system Suaeda salsa Yellow River Estuary

闽江河口芦苇与短叶茳芏湿地植物钴生物富集全年变化特征

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环境科学学报 2024年第4期44卷 356-367页

作者：师自香孙志高李晓胡星云陈冰冰李亚瑾福建师范大学福建省亚热带资源与环境重点实验室福州350007 福建师范大学湿润亚热带生态地理过程教育部重点实验室福州350007 福建闽江河口湿地生态系统国家定位观测研究站(国家林业和草原局) 福州350215 枣庄学院旅游与资源环境学院枣庄277000

河口湿地位于陆海相互作用地带,是痕量有益元素的重要源、汇或转换器.在当前河口复杂环境变化及人类活动影响下,探讨湿地植物痕量有益元素的生物富集特征具有重要意义.本研究选择闽江河口鳝鱼滩的典型芦苇湿地和短叶茳芏湿地为研究对象... 详细信息

河口湿地位于陆海相互作用地带,是痕量有益元素的重要源、汇或转换器.在当前河口复杂环境变化及人类活动影响下,探讨湿地植物痕量有益元素的生物富集特征具有重要意义.本研究选择闽江河口鳝鱼滩的典型芦苇湿地和短叶茳芏湿地为研究对象,探讨了不同湿地植物钴(Co)生物富集的全年变化特征及其主要影响因素.结果表明,研究区湿地土壤Co含量的全年平均值((13.47±1.50)mg·kg^(-1))明显高于福建省表层土壤的背景值(7.41 mg·kg^(-1)),存在中等程度富集.芦苇和短叶茳芏湿地不同土层Co含量的全年变化特征较为相似,二者在1—4月均骤然降低,在5—9月变化不大,而在10—12月均迅速增加;除0~10 cm土层外,后者10~60 cm土层的Co含量均显著高于前者(p<0.05).植物生长节律及土层深度是影响芦苇和短叶茳芏湿地土壤Co含量时空变化的重要因素.芦苇与短叶茳芏不同器官的Co含量及富集系数(BCF_(Co))均以根最高,说明根均是二者Co的重要富集器官;二者根、叶、立枯体的BCF_(Co)在1—6月均呈先增加后降低趋势,之后至12月则呈不同波动变化,这主要与二者生长节律以及其对Co的富集能力差异有关.芦苇与短叶茳芏湿地土壤均是Co的重要储库,其占植物-土壤系统Co储量的比例均超过99.7%.研究发现,短叶茳芏不同器官的Co含量、BCF_(Co)及储量均明显高于芦苇,说明其对于Co具有更强的生物富集能力.

关键词：钴生物富集芦苇短叶茳芏闽江河口

Emissions of Biogenic Sulfur Gases(H2S,COS)from Phragmites australis Coastal Marsh in the Yellow River Estuary of China

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Chinese Geographical Science 2016年第6期26卷 770-778页

作者： LI Xinhua ZHU Zhenlin YANG Liping sun zhigao Shandong Institute of Agricultural Sustainable Development Jinan 250100China Institute of Geography Fujian Normal UniversityFuzhou 350007China Key Laboratory of Humid Subtropical Eco-geographical Process Fujian Normal UniversityMinistry of EducationFuzhou 350007China

Emissions of biogenic sulfur gases(hydrogen sulfide(H_2S) and carbonyl sulfide(COS)) from Phragmites australis coastal marsh in the Yellow River estuary of China were determined during April to December in 2014 using static chamber-gas chromatography technique with monthly sampling. The results showed that the fluxes of H_2S and COS both had distinct seasonal and diurnal variations. The H_2S fluxes ranged from 0.09 μg/(m^2·h) to 7.65 μg/(m^2·h), and the COS fluxes ranged from –1.10 μg/(m^2·h) to 3.32 μg/(m^2·h). The mean fluxes of H_2S and COS from the P. australis coastal marsh were 2.28 μg/(m^2·h), and 1.05 μg/(m^2·h), respectively. The P. australis coastal marsh was the emission source of both H_2S and COS over the whole year. Fluxes of H_2S and COS were both higher in plant growing season than in the non-growing season. Temperature had a dramatic effect on the H_2S emission flux, while the correlations between COS flux and the environmental factors were not found during sampling periods. More in-depth and comprehensive research on other related factors, such as vegetation, sediment substrates, and tidal action is needed to discover and further understand the key factors and the release mechanism of sulfur gases.

关键词： biogenic sulfur gases hydrogen sulfide carbonyl sulfide emission flux Phragmites australis coastal marsh the Yellow River estuary