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Extraction and separation of yttrium from other rare earths in chloride medium by phosphorylcarboxylic acids

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Journal of Rare Earths 2022年第6期40卷 958-964,I0004页

作者： Guolong Wu zhifeng Zhang Yanling Li Wuping Liao State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China

Two phosphorylcarboxylic acids,3-((bis(2-ethylhexyloxy))phosphoryl)propanoic acid(PPA) and 3-((bis(2-ethylhexyloxy))phosphoryl)-3-phenylpropanoic acid(PPPA),were synthesized for separating yttrium from other rare earths in the chloride feed of ion-adsorption type rare earth concentrate.The effect of the factors such as pH_(1/2),temperature,saponification degree and phase modifiers was investigated.The separation efficiencies of PPA and PPPA are obviously better than the typical extractants such as sec-octylphenoxy acetic acid(CA-12) and naphthenic acid(NA).The extraction process of rare earths by PPA and PPPA is a cation exchanging reaction,which is similar to those of CA-12 and NA.The loaded rare earths in both PPA and PPPA systems can be effectively back-extracted by 0.5 mol/L HCl or higher concentration.A cascade extraction process for separating yttrium from other rare earths was developed using PPPA as the extractant.The yttrium product with the purity of 97.20 wt% was obtained by 35 stages of extraction and 12 stages of scrubbing.

关键词： Phosphorylcarboxylic acids Extraction Separation Yttrium Chloride Ion-adsorption type rare earth concentrate

废旧三元锂离子电池正极还原焙烧回收Li的研究

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中南大学学报（自然科学版） 2020年第12期51卷 3367-3378页

作者：严康熊正阳刘志楼徐志峰王瑞祥聂华平江西理工大学绿色冶金与过程强化研究所江西赣州341000

对废旧锂离子电池正极料还原焙烧回收Li的工艺、还原焙烧过程中Li还原产物及其形态变化行为进行研究。采用控制变量法,通过单因素实验研究焙烧过程中焙烧温度、焙烧时间、还原剂用量对Li氢化浸出的影响。采用X线衍射仪、扫描电镜-能谱(S... 详细信息

对废旧锂离子电池正极料还原焙烧回收Li的工艺、还原焙烧过程中Li还原产物及其形态变化行为进行研究。采用控制变量法,通过单因素实验研究焙烧过程中焙烧温度、焙烧时间、还原剂用量对Li氢化浸出的影响。采用X线衍射仪、扫描电镜-能谱(SEM-EDS)对还原焙烧产物物相及形貌进行表征,通过Factsage软件计算焙烧过程热力学,研究还原焙烧过程中Li还原产物在不同温度下的存在形式以及不同形式的存在条件。研究结果表明:当焙烧温度为650℃,焙烧时间为3 h,含碳量(即碳质量分数)为20%时,Li的浸出率最高,达90.33%;随着焙烧温度从500℃提高到750℃,Li2CO3及低价有价金属稳定区呈现出先变大后减小的趋势;高温、长时间焙烧对于Li2CO3生成有抑制作用;当含碳量低于10%时,增加含碳量对还原反应影响较大,当含碳量高于10%时,增加含碳量对还原反应影响较小。

关键词： Li回收还原焙烧热力学浸出率

凉膈散加减辅助治疗急性呼吸窘迫综合征肺热腑实证50例临床研究

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江苏中医药 2024年第6期56卷 38-41页

作者：李泉聂时南孙兆瑞吴志峰孙海军宿迁市第一人民医院江苏宿迁223800 南京中医药大学第一临床学院江苏南京210023 南京大学附属金陵医学院江苏南京210002

目的:观察在常规西医方案基础上加用中药汤剂凉膈散加减治疗急性呼吸窘迫综合征(ARDS)患者的临床疗效。方法:将110例ARDS肺热腑实证患者随机分为治疗组与对照组,每组55例。研究期间治疗组与对照组各脱落5例,最终各完成50例。对照组根据... 详细信息

目的:观察在常规西医方案基础上加用中药汤剂凉膈散加减治疗急性呼吸窘迫综合征(ARDS)患者的临床疗效。方法:将110例ARDS肺热腑实证患者随机分为治疗组与对照组,每组55例。研究期间治疗组与对照组各脱落5例,最终各完成50例。对照组根据指南推荐采用常规西医方案治疗,治疗组在对照组治疗的基础上加用中药汤剂凉膈散加减,2组疗程均为2周。比较2组患者治疗前后中医证候评分、肺功能指标、急性生理学与慢性健康评估(APACHE)Ⅱ量表评分、炎症指标、有创机械通气时间和ICU滞留时间,并进行中医证候疗效比较和安全性评价。结果:治疗后2组患者中医证候总分均明显低于本组治疗前(P0.05)。治疗后治疗组中医证候总有效率为96.00%,明显高于对照组的84.00%(P<0.05)。结论:在常规西医治疗方案基础上加用凉膈散加减能有效改善ARDS肺热腑实证患者的中医证候、肺功能,缓解病情危重程度,抑制炎症反应,并缩短辅助呼吸时间,提高患者生存质量和临床疗效,值得临床推广。

关键词：急性呼吸窘迫综合征凉膈散炎症指标肺功能生存质量

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烘丝机滚筒支撑结构设计与强度分析

现代制造技术与装备 2013年第5期49卷 6-7页

作者：聂金宁李志凤山东中烟工业有限责任公司青州卷烟厂潍坊262500

针对烟草特种装备——SH37D型滚筒管板式烘丝机的滚筒支撑设计中存在不足,分析了滚筒的工作原理,结合滚筒支撑及螺栓出现的问题,对滚筒支撑进行了结构改进。最后,基于理论分析对滚筒支撑改进前后的力学性能进行比较,结果证明了改进后滚... 详细信息

针对烟草特种装备——SH37D型滚筒管板式烘丝机的滚筒支撑设计中存在不足,分析了滚筒的工作原理,结合滚筒支撑及螺栓出现的问题,对滚筒支撑进行了结构改进。最后,基于理论分析对滚筒支撑改进前后的力学性能进行比较,结果证明了改进后滚筒支撑的力学性能显著提高,为滚筒支撑类零件的强度设计提供重要的理论依据,具有一定的工程意义。

关键词：烘丝机滚筒支撑结构设计

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多晶硅还原炉中硅棒的直流电加热模型

太阳能学报 2018年第8期39卷 2287-2292页

作者：方文宝周扬民聂陟枫李亚广侯彦青昆明理工大学复杂有色金属资源清洁利用国家重点实验室昆明650093 昆明理工大学冶金与能源工程学院昆明650093

考虑西门子还原炉内对流传热、辐射传热以及化学反应热,建立24对棒西门子还原炉内硅棒直流电焦耳加热模型。研究不同分布环上硅棒增长半径、反应器壁辐射率对硅棒内部径向温度分布的影响。结果表明：随着硅棒半径的增大,位于内环和中环... 详细信息

考虑西门子还原炉内对流传热、辐射传热以及化学反应热,建立24对棒西门子还原炉内硅棒直流电焦耳加热模型。研究不同分布环上硅棒增长半径、反应器壁辐射率对硅棒内部径向温度分布的影响。结果表明：随着硅棒半径的增大,位于内环和中环的硅棒中心温度先增大又减小,而外环上的硅棒内部温度分布更不均匀;增大反应器壁辐射率,硅棒中心温度逐渐增大;辐射热损失越大,反应器壁的辐射率对硅棒内部温度的影响越强。

关键词：西门子还原炉直流电辐射率温度分布

Multi-strategy engineering unusual sugar TDP-L-mycarose biosynthesis to improve the production of 3-O-α-mycarosylerythronolide B in Escherichia coli

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Synthetic and Systems Biotechnology 2022年第2期7卷 756-764页

作者： zhifeng Liu Jianlin Xu Zhanguang Feng Yong Wang CAS-Key Laboratory of Synthetic Biology CAS Centre for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and EcologyChinese Academy of SciencesShanghai200032China University of Chinese Academy of Sciences Beijing100039China State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai200237China

The insufficient supply of sugar units is the key limitation for the biosynthesis of glycosylated products.The unusual sugar TDP-L-mycarose is initially attached to the C3 of the polyketide erythronolide B,resulting in 3-O-α-mycarosylerythronolide B(MEB).Here,we present the de novo biosynthesis of MEB in Escherichia coli and improve its production using multi-strategy metabolic engineering.Firstly,by blocking precursor glucose-1-phosphate competing pathways,the MEB titer of triple knockout strain QC13 was significantly enhanced to 41.2 mg/L,9.8-fold to that produced by parental strain BAP230.Subsequently,the MEB production was further increased to 48.3 mg/L through overexpression of rfbA and rfbB.Moreover,the CRISPRi was implemented to promote the TDP-L-mycarose biosynthesis via repressing the glycolysis and TDP-L-rhamnose pathway.Our study paves the way for efficient production of erythromycins in E.coli and provides a promising platform that can be applied for biosynthesis of other glycosylated products with unusual sugars.

关键词： TDP-L-mycarose Glycosylated products 3-O-α-mycarosylerythronolide B Metabolic engineering CRISPRi

Photoacoustic image-guided corpus cavernosum intratunical injection of adipose stem cell-derived exosomes loaded polydopamine thermosensitive hydrogel for erectile dysfunction treatment

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Bioactive Materials 2022年第3期7卷 147-156页

作者： Li Liang Yi Shen zhifeng Dong Xin Gu Department of Respiratory and Critical Care Medicine Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai200080China Bio-ID Center School of Biomedical EngineeringShanghai Jiao Tong UniversityShanghai200240China Department of Cardiology Shanghai Sixth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai200233China Department of Urology Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of Medicine201999China

Stem cell-derived exosomes(SC-EXO)was an emerging therapeutic agent in regenerative medicine.Intratunical injection of SC-EXO is considered as a prospective approach for erectile dysfunction(ED)treatment.However,high vascularization of cavernous body makes effective retention a major challenge for SC-EXO intratunical injection.In this study,a Polydopamine nanoparticles(PDNPs)incorporated poly(ethylene glycol)-poly(ε-caprolactone-co-lactide)(PDNPs-PELA)thermosensitive hydrogels were fabricated by a facile in situ polymerization for intratunical administration of adipose stem cell-derived exosomes(EXO).The hydrogels exhibited sol-gel transition at body temperature.Moreover,the in-situ polymerization of PDNPs using poly(ethylene glycol)-poly(ε-caprolactone-co-lactide)(PELA)block copolymer as a template was found to be more stable dispersion in the gel system.After being encapsulated into the hydrogel,EXO shows sustained release behavior within two weeks.In vivo animal experiments revealed that exosomes released from hydrogel lead to the healing of endothelial cells and neurons,increase of the cavity’s pressure,thereby restoring the erectile function.In particular,since the PDNPs in thermosensitive gels have excellent photoacoustic performance,the hydrogel can be accurately delivered into the tunica albuginea by the guidance of real-time photoacoustic imaging.These results suggest that the as-prepared PDNPs-PELA has a promising future as an injectable exosome carrier for ED treatment.

关键词： Photoacoustic imaging Exosomes Thermosensitive gel Intratunical injection Erectile dysfunction

The Impact of Oil Shocks on Systemic Risk of the Commodity Markets

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Journal of Systems Science & Complexity 2024年

作者： DAI zhifeng WU Tong College of Mathematics and Statistics Changsha University of Science and Technology Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering

This study examines the influence of oil shocks on systemic risk spillover among the commodity markets. Specifically, this paper uses the DCC-GARCH approach combined with the TVP-VAR model to calculate risk connectedness and the GARCH-MIDAS model to explore how oil shocks from different sources affect the risk spillover effects among the commodity markets. The results are the following: First, there are significant risk spillovers among the commodity markets with important time-varying characteristics and with sharp changes in times of crisis. The industrial metals, agriculture, precious metals, and light energy commodity markets are risk recipients, and the energy and livestock commodity markets are risk exporters. Second, oil price shocks, particularly oil aggregate demand shocks, prominently affect the total risk connectedness among the commodity markets. In particular, the impact on the net risk spillover effect of different commodity market differs.

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大学英语自主学习能力培养实践反思

科教导刊 2015年第8Z期 35-36,59页

作者：徐红梅杨嵛聂志锋云南大学旅游文化学院外语系云南丽江674199

外语教学的目标之一是培养学生的自主学习能力,使其能够独立学习。为进一步推动大学英语教学改革,促进学生英语自主学习能力培养,云南大学旅游文化学院于2011年始进行了学生网络自主学习试点实践。本文将围绕这一实践,对我院针对非英语... 详细信息

外语教学的目标之一是培养学生的自主学习能力,使其能够独立学习。为进一步推动大学英语教学改革,促进学生英语自主学习能力培养,云南大学旅游文化学院于2011年始进行了学生网络自主学习试点实践。本文将围绕这一实践,对我院针对非英语专业学生所实行的英语自主学习能力培养方案进行总结、分析,从而为进一步探讨符合非英语专业学生实际的、有利于大学生英语自主学习能力的培养提供具有一定现实意义的参考。

关键词：独立学院英语自主学习能力培养方案实践反思

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