检索结果-南通市图书馆

Ceramic membrane fouling mechanisms and control for water treatment

Frontiers of Environmental Science & Engineering 2023年第10期17卷 103-117页

作者： cheng cai Wenjun Sun Siyuan He Yuanna Zhang Xuelin Wang School of Environmental Science&Engineering Tianjin UniversityTianjin 300072China School of Environment Tsinghua UniversityBeijing 100084China Research Institute for Environmental Innovation(Suzhou)Tsinghua Suzhou 215163China

Membrane separation, as an important drinking water treatment technology, has wide applications. The remarkable advantages of ceramic membranes, such as chemical stability, thermal stability, and high mechanical strength, endow them with broader prospects for development. Despite the importance and advantages of membrane separation in water treatment, the technique has a limitation: membrane fouling, which greatly lowers its effectiveness. This is caused by organics, inorganic substances, and microorganisms clogging the pore and polluting the membrane surface. The increase in membrane pollution greatly lowers purification effectiveness. Controlling membrane fouling is critical in ensuring the efficient and stable operation of ceramic membranes for water treatment. This review analyzes four mechanisms of ceramic membrane fouling, namely complete blocking, standard blocking, intermediate blocking, and cake filtration blocking. It evaluates the mechanisms underlying ceramic membrane fouling and summarizes the progress in approaches aimed at controlling it. These include ceramic membrane pretreatment, ceramic membrane surface modification, membrane cleaning, magnetization, ultrasonics, and nanobubbles. This review highlights the importance of optimizing ceramic membrane preparation through further research on membrane fouling and pre-membrane pretreatment mechanisms. In addition, combining process regulations with ceramic membranes as the core is an important research direction for ceramic membrane-based water treatment.

关键词： Ceramic membrane Fouling model Fouling control

来源：

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

A reaction density functional theory study of solvent effect in the nucleophilic addition reactions in aqueous solution

引用

Green Energy & Environment 2022年第4期7卷 782-791页

作者： cheng cai Weiqiang Tang Chongzhi Qiao Bo Bao Peng Xie Shuangliang Zhao Honglai Liu State Key Laboratory of Chemical Engineering and School of Chemical Engineering East China University of Science and TechnologyShanghai200237China School of Chemistry and Molecular Engineering East China University of Science and TechnologyShanghai200237China Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical EngineeringGuangxi UniversityNanning530004China

Whereas the proper choice of reaction solvent constitutes the cornerstone of the green solvent concept,solvent effects on chemical reactions are not mechanistically well understood due to the lack of feasible molecular models.Herein,by taking the case study of nucleophilic addition reaction in aqueous solution,we extend the proposed multiscale reaction density functional theory(RxDFT)method to investigate the intrinsic free energy profile and total free energy profile,and study the solvent effect on the activation and reaction free energy for the nucleophilic addition reactions of hydroxide anion with methanal and carbon dioxide in aqueous solution.The predictions of the free energy profile in aqueous solution for these two nucleophilic addition reactions from RxDFT have a satisfactory agreement with the results from the RISM and MD-FEP simulation.Meanwhile,the solvent effect is successfully addressed by examining the difference of the free energy profile between the gas phase and aqueous phase.In addition,we investigate the solvent effect on the reactions occurred near solid-liquid interfaces.It is shown that the activation free energy is significantly depressed when reaction takes place in the region within 10A distance to the substrate surface owing to the decrease of hydration free energy at the solid-liquid interface.

关键词： Reaction density functional theory Nucleophilic addition Solvent effect Charge models

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

间充质干细胞来源的胞外囊泡治疗新生儿支气管肺发育不良的研究进展

引用

生理科学进展 2024年第1期55卷 5-12页

作者：刘怡波蔡成上海交通大学医学院附属儿童医院上海市儿童医院新生儿科上海200062

支气管肺发育不良(bronchopulmonary dysplasia,BPD)是早产儿的慢性肺部疾病,尤其是极早产儿(出生胎龄小于32周)最常见的并发症。尽管围产期救治及护理取得了进步,但现代临床管理仍然缺乏专门促进肺修复和肺生长的疗法。间充质干细胞(me... 详细信息

支气管肺发育不良(bronchopulmonary dysplasia,BPD)是早产儿的慢性肺部疾病,尤其是极早产儿(出生胎龄小于32周)最常见的并发症。尽管围产期救治及护理取得了进步,但现代临床管理仍然缺乏专门促进肺修复和肺生长的疗法。间充质干细胞(mesenchymal stem cells,MSCs)是一类具有多向分化潜能的干细胞,其最新进展揭示了干细胞/祖细胞修复受损器官的前景。但MSCs本身存在的临床风险导致其无法实现更加广泛的应用。研究表明,在BPD动物模型中,MSCs来源的细胞外囊泡(MSCs-derived extracellular vesicles,MSC-EVs)可以通过下调纤维化因子、减轻炎症反应、促进血管生成、抗细胞凋亡、抗氧化应激等途径促进肺血管生成和肺泡的发育,减少肺动脉高压和炎症,在BPD肺损伤修复中发挥重要作用。本文主要综述了MSC-EVs治疗早产儿BPD的有潜力的临床前证据及可能机制,为今后其在BPD的临床应用提供新的治疗思路。

关键词：胞外囊泡支气管肺发育不良新生儿免疫调节氧化应激

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

早产儿微量营养素管理的研究进展

引用

生理科学进展 2024年第1期55卷 80-85页

作者：张丰宁蔡成上海市儿童医院上海交通大学医学院附属儿童医院新生儿科上海200062

胎儿期和婴儿期是各器官塑造的关键时间窗口,早产儿由于营养贮备水平低下以及身体各系统发育不成熟易出现营养不良,从而导致微量营养素缺乏,与早产儿出现败血症、代谢性骨病,以及晚期代谢性相关疾病息息相关。其中,维生素D、钙、磷、铁... 详细信息

胎儿期和婴儿期是各器官塑造的关键时间窗口,早产儿由于营养贮备水平低下以及身体各系统发育不成熟易出现营养不良,从而导致微量营养素缺乏,与早产儿出现败血症、代谢性骨病,以及晚期代谢性相关疾病息息相关。其中,维生素D、钙、磷、铁、锌、碘、以及镁元素在骨骼系统、神经系统、心血管系统、血液系统等多系统中发挥至关重要的作用。因此,提供适当的营养素以预防营养失调是关键所在。本文将对早产儿中重要微量营养素:维生素D、钙、磷、铁、锌、碘、以及镁元素的来源、需求量、在早产儿中的作用以及现有文献建议剂量进行系统性阐述,以期为早产儿关于微量营养素补充的营养规划提供一定帮助。

关键词：早产儿维生素D 钙磷微量营养素

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Improved oxidation of hydrogen off-gas by hydrophobic surface modification: A multiscale density functional theory study

引用

Particuology 2019年第3期17卷 28-35页

作者： cheng Lian cheng cai Xiangjian Shen Shuangliang Zhao Xinhai Yu Honglai Liu State Key Laboratory of Chemical Engineering and School of Chemical Engineering East China University of Science and Technology Shanghai 200237 China School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 220237 China Research Center of Heterogeneous Catalysis and Engineering Science School of Chemical Engineering and Energy Zhengzhou University Zhengzhou 450001 China Key Laboratory of Safety Science of Pressurized System (MOE) School of Mechanical Engineering East China University of Science and Technology Shanghai 200237 China

A catalytic micro-reactor for converting hydrogen off-gas into water was recently developed, through which the conversion efficiency of hydrogen gas was greatly improved by hydrophobic modification of the catalytic substrate. Herein, a hybrid theoretical method is reported that combines density functional theory (DFT) on both the quantum and molecular scales. This method allows the microscopic study of the mechanism by which the surface catalytic reaction can be manipulated. Specifically, quantum DFT calculations are performed to quantify the molecular interaction between the catalytic substrate and reagent or product. Classical DFT investigations are subsequently carried out to determine the local concentrations of reagents near catalytic sites subject to different surface coating conditions. Finally, the reaction efficiency is determined from the local concentrations based on collision theory. This multiscale method provides molecular insight for quantifying the effect of catalytic surface modification on the reaction efficiency. The method reveals that an optimal surface hydrophobic modification can promote the densities of reagents near the substrate, while depleting the produced water. These two factors promote the conversion efficiency. The exclusion of produced water from the catalytic substrate is affected more by the degree of polymer grafting than by the chain length of hydrophobic polymer moieties.

关键词： Surface reaction Hydrophobic modification Density functional theory Multiscale

来源：

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

A GSH-depleted platinum(Ⅳ) prodrug triggers ferroptotic cell death in breast cancer

引用

Chinese Chemical Letters 2022年第10期33卷 4595-4599页

作者： Dachuan Qi Lei Xing Lijun Shen Wenshuang Sun cheng cai Chunhua Xue Xuwei Song Hua Yu Hulin Jiang chengjun Li Qingri Jin Zhiqi Zhang Department of General Surgery Shanghai Fourth People's HospitalSchool of MedicineTongji UniversityShanghai 200434China Department of Pharmaceutics China Pharmaceutical UniversityNanjing 210009China Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province College of Animal Science and TechnologyCollege of Veterinary MedicineZhejiang A&F UniversityLin'an 311300China Department of Orthopedics Jinling HospitalSchool of MedicineNanjing UniversityNanjing 210002China

Cisplatin is the first-line drug for treatment of various solid tumors including breast cancer due to the broad anti-tumor spectrum and strong anti-tumor effect.However,serious side effects and long-term medication of reduced sensitivity by high GSH in tumor cells have severely restricted its further clinical application.Herein,a GSH-depleted Pt(Ⅳ)prodrug(Platin B)based on cisplatin and 4-carboxylphenylboronic acid pinacol ester was prepared to solve the problems.As an excellent GSH scavenger,4-carboxylphenylboronic acid pinacol ester could be activated by intracellular redox reactions to release quinone methide,thereby amplifying oxidative stress and leading to breast cancer ferroptosis therapy.Interestingly,the consumption of GSH can also reduce cisplatin inactivation,enhance the sensitivity of tumor cells to cisplatin and efficiently induce apoptosis/ferroptosis.This work highlights the use of GSH scavenger for triggering ferroptotic cell death in breast cancer.

关键词： Cisplatin Ferroptosis Cancer therapy Glutathione depletion Tetravalent platinum prodrug

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

某有机化工厂废水中水回用案例工艺及运行分析

引用

云南化工 2024年第4期51卷 132-134页

作者：程材中煤科工集团杭州研究院有限公司浙江杭州311201

采用“臭氧催化氧化+硝化反硝化生化系统+浸没式超滤+反渗透”组合工艺深度处理有机化工废水(该深化处理系统进水为预处理阶段的出水),实现废水的再回收利用。工程处理规模为360 m^(3)/d,其中生化部分出水COD平均值为79 mg/L,NH_(3)-N在... 详细信息

采用“臭氧催化氧化+硝化反硝化生化系统+浸没式超滤+反渗透”组合工艺深度处理有机化工废水(该深化处理系统进水为预处理阶段的出水),实现废水的再回收利用。工程处理规模为360 m^(3)/d,其中生化部分出水COD平均值为79 mg/L,NH_(3)-N在0.1~0.8 mg/L之间,TN值稳定在15 mg/L左右,各指标均满足反渗透两倍浓缩要求(即浓水纳管排放标准);回用水水质COD≤5 mg/L,NH_(3)-N≤0.1 mg/L,Cl^(-)≤3.5 mg/L,电导率≤10μS/cm,pH 7.3~8.6,回用率≥50%,符合回用水水质及水量要求。实践表明,该深化处理中水回用系统运行稳定,既能达到企业节约水资源的目的,又能实现中水回用的要求。

关键词：有机化工深度处理反渗透中水回用

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

白先勇《台北人》的“神圣空间”

引用

华侨大学学报（哲学社会科学版） 2024年第2期 145-156页

作者：郑绍楠程彩霞华侨大学文学院福建泉州362021 厦门理工学院马克思主义学院福建厦门361024

白先勇《台北人》的表现主题除了以“今昔之比”为主要内容的时间主题外,还有一个更为本质且少有人关注的空间主题,此空间主题可称之为“神圣空间”。在《台北人》中,白先勇通过“时间的空间化”和“空间的时间化”,使空间成为一种具有... 详细信息

白先勇《台北人》的表现主题除了以“今昔之比”为主要内容的时间主题外,还有一个更为本质且少有人关注的空间主题,此空间主题可称之为“神圣空间”。在《台北人》中,白先勇通过“时间的空间化”和“空间的时间化”,使空间成为一种具有表现力的积极因素,空间不仅是时间的标识物,而且还是推动时间之流的“框架性的事物综合体”。这导致“今昔之比”的表现内容最后却落实为两个空间的对比,在此基础上,“神圣空间”主题得以凸显和确立。《台北人》叙事中存在着“神圣空间”/“世俗空间”互相比照的空间结构。在此结构中,“神圣空间”是小说人物灵性存在的关键所在,当人物被“贬谪”入“世俗空间”,其灵性以及与灵性相关联的美好品质便趋于消亡。小说人物的塑造就是围绕此“神圣空间”主题而展开。

关键词：白先勇《台北人》神圣空间空间主题

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Severe hyperbilirubinemia in a neonate with hereditary spherocytosis due to a de novo ankyrin mutation: A case report

引用

World Journal of Clinical Cases 2021年第19期9卷 5245-5251页

作者： Jun-Fang Wang Li Ma Xiao-Hui Gong cheng cai Jing-Jing Sun Department of Neonatology Shanghai Children’s HospitalShanghai Jiao Tong UniversityShanghai 200062China NHC Key Laboratory of Medical Embryogenesis and Developmental Molecular Biology Shanghai Key Laboratory of Embryo and Reproduction EngineeringShanghai 200062China

BACKGROUND Hereditary spherocytosis(HS)is a common type of hemolytic anemia caused by a red cell membrane disorder.HS type 1(HS1)is mostly caused by mutations in ankyrin(ANK1).Newborns with HS1 usually only exhibit anemia and mild jaundice.We herein report a case of HS1 and discuss its clinical characteristics.CASE SUMMARY A 2-d-old male full-term newborn was admitted to our hospital with severe,intractable neonatal jaundice.Laboratory investigations showed hemolytic anemia and hyperbilirubinemia and excluded immune-mediated hemolysis.The patient underwent two exchange transfusions and one plasmapheresis resulting in significantly reduced serum bilirubin.Hematologic analyses and genomic DNA sequencing studies were performed.The trio clinical exome sequencing revealed a de novo null heterozygous mutation in the patient's ANK1 gene:c.841C>T(p.Arg281Ter).This mutation results in the premature termination of the ANK1 protein.CONCLUSION Our case demonstrates that genetic analysis can be an essential method for diagnosing HS when a newborn has severe hyperbilirubinemia.

关键词： Hereditary spherocytosis Ankyrin Neonate Intractable neonatal jaundice Case report

来源：

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

中国西北干旱区高寒湿地生态系统呼吸的季节和日变化及其环境控制

引用

Journal of Plant Ecology 2022年第5期15卷 933-946页

作者： Hu Yao Haijun Peng Bing Hong Hanwei Ding Yetang Hong Yongxuan Zhu Jie Wang cheng cai State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China Bayinbuluk Alpine Wetland Carbon Flux Research Station Chinese Flux Observation and Research NetworkBeijingChina University of Chinese Academy of Sciences Beijing 100049China CAS Center for Excellence in Quaternary Science and Global Change Xi'an 710061China School of Chemical Engineering Guizhou Institute of TechnologyGuiyang 550055China

湿地储存了大量的碳,在全球碳循环和区域生态系统服务中发挥着重要作用。了解湿地碳交换动态对评估碳收支和预测其未来演变至关重要。虽然关于气候变化对生态系统碳循环的影响已经进行了大量的研究,但对中国西北干旱区高寒湿地碳排放的... 详细信息

湿地储存了大量的碳,在全球碳循环和区域生态系统服务中发挥着重要作用。了解湿地碳交换动态对评估碳收支和预测其未来演变至关重要。虽然关于气候变化对生态系统碳循环的影响已经进行了大量的研究,但对中国西北干旱区高寒湿地碳排放的研究相对较少。本研究利用自动箱法(LI-8100A)对中国西北干旱区巴音布鲁克高寒湿地生态系统呼吸(ER)进行测量。结果显示,ER呈显著的“双峰”型日变化,峰值分别出现在北京时间的16:30和23:30。ER也呈明显的季节性变化规律,ER最大值(19.38μmolm^(-2)s^(-1))出现在8月,最小值(0.11μmolm^(-2)s^(-1))出现在12月。2018年生态系统的年排放量为678gCm^(-2),其中非生长季的排放量占全年总排放量的13%。非线性回归表明土壤5cm处温度和水分含量的变化是控制ER季节变化的主要因素。ER的日变化主要受空气温度和太阳辐射的共同影响。在较低的土壤温度和中等土壤水分含量(25%≤SWC≤40%)条件下,生态系统温度敏感性(Q_(10))较高。本研究加深了我们对高寒湿地生态系统CO_(2)排放的理解,并有助于评估干旱地区高寒湿地的碳收支。

关键词：高寒湿地生态系统呼吸环境因子自动箱法 Q_(10)

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：