检索结果-南通市图书馆

Adsorptive behaviors of humic acid onto freshly prepared hydrous manganese dioxides

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2007年第2期1卷 240-245页

作者： LIU Ruiping YANG Yanling LI Guibai HE Wenjie han hongda School of Municipal and Environmental Engineering Harbin Institute of TechnologyHarbin 150090China College of Civil Engineering and Architecture Beijing University of TechnologyBeijing 100022China Tianjin Water Supply Group Co.Ltd Tianjin 300040China

This study focused on the adsorptive behaviors of humic acid onto freshly prepared hydrous MnO_(2)(s)(δMnO_(2)),and investigated the feasibility of employingδMnO2 for humic acid removal from drinking *** of such parameters as molecular mass of humic acid,kinds of diva-lent cations on adsorptive behaviors and possible mechanisms involved were *** study indicated that humic acid with higher molecular mass exhibited more tendency of adsorbing ontoδMnO2 than that with lower molecular ***^(2+)facilitated more humic acid adsorption than Mg^(2+);UV-Vis spectra analysis indicated higher capabilities of Ca^(2+)coordinating with acidic functional groups of humic acid than that of Mg2+.Additionally,ζpotential characterization indicated that Ca^(2+)showed higher potential of increasingζpotential ofδMnO_(2) than Mg^(2+).Ca^(2+)of 1.0 mmol/L increasedζpotential ofδMnO2 from−37 mV(pH 7.9)to+7 mV(pH 7.2),while 1.0 mmol/L Mg^(2+)^increased to lower value as−9 mV(pH 6.5),*** transform infrared(FTIR)spectra demonstrated the adsorption of humic acid ontoδMnO_(2),showing the important roles of-COO−function-al groups and surface Mn-OH in the adsorption of humic acid ontoδMnO_(2).

关键词： δMnO_(2) humic acid adsorptive behavior ζpotential molecular mass

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

平原水库典型嗅味污染物主要影响因素分析

供水技术 2024年第3期18卷 1-5页

作者：李鑫斐韩宏大赵林马凯张震龙天津大学环境科学与工程学院天津300072 天津市自来水集团有限公司天津300040 天津水务集团有限公司天津300042

目前对水库嗅味污染影响因素的系统分析匮乏,且现有嗅味预测模型输入指标主要以水质数据为主,需要大量检测数据,实用性不高。为探究影响平原水库典型嗅味物质浓度的主要影响因子,利用可预测或可操控指标搭建预测模型,为嗅味污染防治提... 详细信息

目前对水库嗅味污染影响因素的系统分析匮乏,且现有嗅味预测模型输入指标主要以水质数据为主,需要大量检测数据,实用性不高。为探究影响平原水库典型嗅味物质浓度的主要影响因子,利用可预测或可操控指标搭建预测模型,为嗅味污染防治提供指导,本研究搜集2020—2023年天津市北塘水库水质数据、调度数据以及水库所在地区气象数据共57个指标进行相关分析与主成分分析,并以气象数据、调度数据为主,水质数据为辅,利用线性回归构建预测模型。结果表明,利用溶解氧、入塘流量与蒸发量等指标构建预测模型,2-甲基异莰醇回归模型拟合R^(2)为0.627,土臭素拟合R^(2)为0.458,可以为水库嗅味浓度风险防治提供定性指导。

关键词：平原水库嗅味 2-甲基异莰醇土臭素影响因素

High temperature treatment induced production of unreduced 2n pollen in Camellia oleifera

在线全文

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2024年第3期10卷 879-896页

作者： hongda Deng Xiaoyu Zhang Song Sheng Yuxun Huang Ziqi Ye Tongyue Zhang Xing Liu Zhiqiang han The Laboratory of Forestry Genetics Central South University of Forestry and TechnologyChangshaHunan 410004China Yuelushan Laboratory ChangshaHunan 410128China Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees of Ministry of Education Central South University of Forestry and TechnologyChangshaHunan 410004China National Forest and Seedling Workstation of Hunan Province The Forestry Department of Hunan ProvinceChangshaHunan 410004China

Unreduced gametes through chromosome doubling play a major role in the process of plant *** previous work confirmed that Camellia oleifera can produce natural 2n pollen,and it is possible to induce the 2n pollen formation by high temperature *** study focused on the optimization of the 2n pollen induction technique and the mechanisms of high temperature-induced2n pollen formation in *** found that the optimal protocol for inducing 2n pollen via high temperature was to perform 45℃with4 h at the prophaseⅠstage of the pollen mother cells(PMCs).Meanwhile,high temperature significantly decreased the yield and fertility of2n *** the observation of meiosis,abnormal chromosome and cytological behaviour was discovered under high-temperature treatment,and we confirmed that the formation of 2n pollen is caused by abnormal cell *** on weighted gene co-expression network analysis,fifteen hub genes related to cell cycle control were *** male flower buds were exposed to heat shock,polygalacturonase gene(CoPGX3)was significantly *** inferred that high temperature causes the CoPGX3 gene to be overexpressed and that CoPGX3 is redistributed into the cytosol where it degrades cytoplasmic pectin,which leads to an abnormal cell ***,abnormal cytokinesis resulted in the formation of dyads and triads,and PMCs divided to produce 2n *** findings provide new insights into the mechanism of 2n pollen induced by high temperature in a woody plant and lay a foundation for further ploidy breeding of ***.

关键词： Camellia oleifera Pollen mother cells(PMCs) High temperature Meiosis 2n pollen CoPGX3

Human umbilical cord mesenchymal stem cell-derived exosomes loaded into a composite conduit promote functional recovery after peripheral nerve injury in rats

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第4期19卷 900-907页

作者： Haoshuai Tang Junjin Li hongda Wang Jie Ren han Ding Jun Shang Min Wang Zhijian Wei Shiqing Feng Department of Othopaedics Tianjin Medical University General Hospital International Science and Technology Cooperation Base of Spinal Cord Injury Tianjin Key Laboratory of Spine and Spinal Cord InjuryDepartment of OrthopedicsTianjin Medical University General Hospital Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment Tianjin Lung Cancer InstituteTianjin Medical University General Hospital Department of Othopaedics Qilu Hospital of Shandong UniversityShandong University Centre for OthopedicsAdvanced Medical Research InstituteShandong University Orthopedic Research Center of Shandong University&Advanced Medical Research Institute Cheeloo College of MedicineShandong University

Complete transverse injury of peripheral nerves is challenging to *** secreted by human umbilical cord mesenchymal stem cells are considered to play an important role in intercellular communication and regulate tissue *** previous studies,a collagen/hyaluronic acid sponge was shown to provide a suitable regeneration environment for Schwann cell proliferation and to promote axonal *** three-dimensional(3D)composite conduit contains a collagen/hyaluronic acid inner sponge enclosed in an electrospun hollow poly(lactic-co-glycolic acid)***,whether there is a synergy between the 3D composite conduit and exosomes in the repair of peripheral nerve injury remains *** this study,we tested a comprehensive strategy for repairing long-gap(10 mm)peripheral nerve injury that combined the 3D composite conduit with human umbilical cord mesenchymal stem cell-derived *** effectiveness was evaluated by sciatic functional index,sciatic nerve compound muscle action potential recording,recovery of muscle mass,measuring the cross-sectional area of the muscle fiber,Masson trichrome staining,and transmission electron microscopy of the regenerated nerve in *** results showed that transplantation of the 3D composite conduit loaded with human umbilical cord mesenchymal stem cell-derived exosomes promoted peripheral nerve regeneration and restoration of motor function,similar to autograft *** CD31-positive endothelial cells were observed in the regenerated nerve after transplantation of the loaded conduit than after transplantation of the conduit without exosomes,which may have contributed to the observed increase in axon regeneration and distal nerve ***,the use of a 3D composite conduit loaded with human umbilical cord mesenchymal stem cell-derived exosomes represents a promising cell-free therapeutic option for the treatment of peripheral nerve injury.

关键词： axon growth collagen exosome human umbilical cord mesenchymal stem cells hyaluronic acid muscular atrophy nerve guidance conduits peripheral nerve regeneration

在线全文

学校读者我要写书评

暂无评论

臭氧多相催化氧化处理微污染水中试研究

环境科学学报 2006年第9期26卷 1412-1419页

作者：马军韩帮军张涛陈忠林何文杰韩宏大哈尔滨工业大学天津自来水集团有限公司

通过中试系统初步比较了非均相催化剂催化臭氧化与传统中间臭氧化在饮用水深度处理中的净化效能.结果表明,对有机物污染宏观指标CODMn、TOC的控制,催化臭氧化具有明显优势,降低了后续处理工艺的有机物负荷;催化臭氧化与中间臭氧化对UV25... 详细信息

通过中试系统初步比较了非均相催化剂催化臭氧化与传统中间臭氧化在饮用水深度处理中的净化效能.结果表明,对有机物污染宏观指标CODMn、TOC的控制,催化臭氧化具有明显优势,降低了后续处理工艺的有机物负荷;催化臭氧化与中间臭氧化对UV254的去除率相当;催化剂能够强化臭氧氧化,使其进一步去除水中持久性有毒有害有机物,并且显著地提高了臭氧氧化氨氮生成硝酸盐氮的能力,催化剂也强化了臭氧的传质与利用.

关键词：微污染多相催化臭氧化遗传毒性 NH4+-N 传质

饮用水中Geosmin和2-MIB去除技术研究现状及展望

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

给水排水 2021年第S1期47卷 517-523页

作者：苏晓贾霞珍胡建坤韩宏大李荣韩正双季民天津水务集团有限公司天津300042 天津市自来水集团有限公司天津300040 天津大学环境科学与工程学院天津300054 天津市公用事业设计研究所天津300100

土臭素(Geosmin)和2-甲基异莰醇(2-MIB)是饮用水源中普遍存在的嗅味问题,受到人们的广泛关注。系统分析了Geosmin和2-MIB在水中的来源及其存在形态,全面阐述了Geosmin和2-MIB的活性炭吸附、氧化、生物以及组合工艺等去除技术。结合几种... 详细信息

土臭素(Geosmin)和2-甲基异莰醇(2-MIB)是饮用水源中普遍存在的嗅味问题,受到人们的广泛关注。系统分析了Geosmin和2-MIB在水中的来源及其存在形态,全面阐述了Geosmin和2-MIB的活性炭吸附、氧化、生物以及组合工艺等去除技术。结合几种技术的特点,对不同技术在实际生产中的应用前景进行了展望。

关键词：饮用水土臭素 2-甲基异莰醇去除技术

在线全文

学校读者我要写书评

暂无评论

丙烯腈装置冰机冷凝器的阴极保护技术

炼油与化工 2015年第2期26卷 43-45页

作者：任中育韩宏达大庆石化公司化工二厂黑龙江大庆163714 大庆石化公司建设公司黑龙江大庆163714

通过对丙烯腈装置冰机冷凝器列管和管板的腐蚀情况分析,提出了采取了阴极保护技术进行防护,有效地抑制了管束、管板的腐蚀,提高设备的使用寿命。

关键词：冰机冷凝器腐蚀管束阴极保护

羟基锡酸锌-还原氧化石墨烯杂化材料与氢氧化镁对PVC的协效阻燃作用

在线全文

学校读者我要写书评

暂无评论

中国塑料 2018年第3期32卷 110-115页

作者：许硕季琦王雪韩宏达屈红强徐建中河北大学化学与环境科学学院河北保定071002

将自制的羟基锡酸锌(ZHS)-还原氧化石墨烯(RGO)杂化材料(ZHS-RGO)和氢氧化镁(MH)协效应用于软质聚氯乙烯(PVC)中。通过氧指数测定仪、微型量热测定仪和锥形量热仪分析了ZHS和ZHS-RGO杂化材料分别与MH协效对软质PVC阻燃及消烟性能的影响... 详细信息

将自制的羟基锡酸锌(ZHS)-还原氧化石墨烯(RGO)杂化材料(ZHS-RGO)和氢氧化镁(MH)协效应用于软质聚氯乙烯(PVC)中。通过氧指数测定仪、微型量热测定仪和锥形量热仪分析了ZHS和ZHS-RGO杂化材料分别与MH协效对软质PVC阻燃及消烟性能的影响。结果表明,ZHS和ZHS-RGO与MH协同应用在PVC中具有很好的协同阻燃抑烟效果;样品PVC/10ZHS-RGO/5MH的热释放速率峰值为436kW/m^2,烟释放总量为23.62m2,相比于PVC/10ZHS/5MH分别降低了38.8%和12.0%;杂化材料中的RGO具有良好的物理阻隔作用。

关键词：羟基锡酸锌石墨烯氢氧化镁聚氯乙烯阻燃

在线全文

学校读者我要写书评

暂无评论

浸入式和压入式膜处理滦河水的对比试验研究

工业水处理 2008年第10期28卷 74-77页

作者：韩宏大吕晓龙何文杰李爱斌天津工业大学生物化工研究所天津300160 天津市自来水集团有限公司天津300040

采用浸入式和压入式膜工艺处理滦河水,并进行了对比试验研究。结果表明:浸入式和压入式膜系统对污染物具有很好的去除效果,膜工艺出水水质都符合《生活饮用水卫生标准》(GB5749—2006)的要求。浸入式膜在去除浊度和产水率方面具有优势;... 详细信息

采用浸入式和压入式膜工艺处理滦河水,并进行了对比试验研究。结果表明:浸入式和压入式膜系统对污染物具有很好的去除效果,膜工艺出水水质都符合《生活饮用水卫生标准》(GB5749—2006)的要求。浸入式膜在去除浊度和产水率方面具有优势;压入式膜在去除CODMn、UV254和运行费用方面具有优势;在去除菌藻及膜污染速率方面,两种膜工艺几乎相同。在实际应用中可采用压入式膜工艺处理原水,采用浸入式膜工艺处理反洗水,这样既提高了膜系统的产水率又保障了出水水质,也降低了运行费用,使膜工艺系统安全稳定运行。

关键词：浸入式膜压入式膜滦河水