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Homogeneous nanoparticle dispersion prepared with impurity-free dispersant by the ball mill technique

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Particuology 2013年第4期11卷 441-447页

作者： lingyun zhou Hui Zhang Hui Zhang Zhong Zhang National Center for Nanoscience and Technology Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China

The homogeneous dispersion of nanoparticles in solvents or polymer matrices is essential for prac- tical application of nanocomposites. In this study, the planetary ball milling technique was used to de-agglomerate silica nanoparticles in butyl acetate. The size of the nanosilica aggregates was evalu- ated by TEM and SEM. With the addition of polyacrylate polymer to the organic solvent, the nanoparticle agglomerates were effectively broken up by planetary ball milling at the proper milling time; however, re-agglomeration occurred after a longer milling time. The results of TGA and FTIR indicated that the polyacrylate molecules could be adsorbed in situ onto the nanoparticles. Behaving similar to a dispersant, the adsorbed polyacrylate reduced the blend viscosity significantly and prevented re-agglomeration of the nanoparticles. Utilizing the polyacrylate polymer both as the dispersant and the polymer matrix, the polyacrylate-based nanocoatings were further prepared. The optical transmittance and haze value of the nanocoatings were found to be sensitive to the dispersion level of the nanoparticles, and the elastic mod- ulus and hardness of the nanocoatings were improved in comparison with those of the neat polymer coating.

关键词： NanoparticleNanocoatingBall millDispersant

A Classic Case of Dialectical Treatment of Diabetes Complicated with Diarrhea in the Elderly

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Medicinal Plant 2022年第4期13卷 57-60页

作者： Zeyu ZHANG lingyun zhou Guizhou University of Traditional Chinese Medicine Guiyang 550000China

As a common chronic disease of the elderly,diabetes endangers both physical and mental health of the elderly.Diarrhea is a common complication of diabetes and causes great inconvenience to patients’daily life.Professor zhou lingyun from Chief Physician,Department of Geriatrics,Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine has been engaged in clinical practice for many years and is good at treating miscellaneous diseases in geriatric internal medicine.She has unique thinking and experience in the diagnosis and treatment of diabetic diarrhea.Professor zhou lingyun believed that the pathogenesis of diabetic diarrhea in the elderly is the deficiency of spleen and stomach qi and dampness.She is good at using Modified Sijunzi Decoction to nourish qi,invigorate the spleen and dispel dampness,so as to treat diabetic diarrhea.This paper introduced and analyzed a classic case of Professor zhou lingyun’s treatment of diabetic diarrhea in the elderly.

关键词： Diabetes Diarrhea Traditional Chinese medicine(TCM)treatment

Clinical Report on the Treatment of Post-stroke Cognitive Impairment Based on Microbe-Gut-Brain Axis Theory

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Medicinal Plant 2022年第2期13卷 70-72,86页

作者： Zhonghui ZENG lingyun zhou Zeyu ZHANG Guizhou University of Traditional Chinese Medicine Guiyang 550002 China Cadre Health Care Department The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine Guiyang 550003 China

Based on the close relationship between MGBA and PSCI,one PSCI related case is reported,and it is emphasized to improve clinicians'understanding of MGBA theory in the treatment of PSCI,thereby providing new ideas for ... 详细信息

关键词： Microbe-gut-brain axis Post-stroke cognitive impairment Gut microbe

The origin of the site preference of H adsorption on Pd(100)

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Science China Chemistry 2015年第1期58卷 156-161页

作者： lingyun zhou Yun Zhao Zhening Chen Gang Fu Huilin Wan State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University

Spin-polarized density functional theory(DFT)calculations are carried out to determine the site preference of H adsorption on Pd(100)surface and subsurface.We carefully scrutinize the energy difference between different patterns at=0.50 ML and confirm the LEED observation that surface adsorption can form c(2×2)ordering structure.On the contrary,we disclose that p(2×1)structure become more favorable than c(2×2)for subsurface adsorption.These site preferences are rationalized via an analysis of the layer and orbital resolved density of states.Furthermore,we propose that the interstitial charge as a key factor determining the preferred H adsorbed site.

关键词：表面吸附偏好部位密度泛函理论起源自旋极化 LEED 钯

多发性骨髓瘤伴心脏淀粉样变性并继发性肾上腺皮质功能减退症1例

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上海交通大学学报（医学版） 2024年第4期44卷 537-542页

作者：周凌云陈海飞广东省深圳市罗湖区人民医院血液内科深圳518000

多发性骨髓瘤是一种浆细胞恶性增殖性疾病,部分患者可合并系统性淀粉样变性,心脏淀粉样变性是该类患者常见的死亡原因。继发性肾上腺功能不全是由下丘脑和/或垂体功能障碍所致,而多发性骨髓瘤患者合并继发性肾上腺皮质功能减退症的病例... 详细信息

多发性骨髓瘤是一种浆细胞恶性增殖性疾病,部分患者可合并系统性淀粉样变性,心脏淀粉样变性是该类患者常见的死亡原因。继发性肾上腺功能不全是由下丘脑和/或垂体功能障碍所致,而多发性骨髓瘤患者合并继发性肾上腺皮质功能减退症的病例在国内鲜见报道。患者,55岁,男性,2018年6月5日因“反复胸闷、乏力7个月,晕厥1 h”就诊于深圳市罗湖区人民医院急诊科,后转入血液内科,经骨髓穿刺等检查明确诊断为多发性骨髓瘤(λ轻链型)伴系统性淀粉样变性。化学治疗(化疗)第1疗程方案为硼替佐米、环磷酰胺和地塞米松,疗程结束后患者肺部出现细菌与真菌混合感染,经治疗后好转。第2疗程开始方案调整为硼替佐米和地塞米松,第4疗程后患者多发性骨髓瘤即达到完全缓解;第5疗程后患者再次发生严重肺部混合感染,治疗后好转,但后续出现顽固性低血压,皮质醇和促肾上腺皮质激素(adrenocorticotropic hormone,ACTH)水平下降,诊断为继发性肾上腺皮质功能减退症,予以氢化可的松替代治疗。患者接受9个化疗疗程后,以伊沙佐米维持治疗,多发性骨髓瘤评估为严格意义的完全缓解状态,心脏淀粉样变性疗效评估为非常好的部分缓解;继发性肾上腺皮质功能减退症以氢化可的松维持治疗,皮质醇水平在正常范围内。

关键词：多发性骨髓瘤系统性淀粉样变性心脏淀粉样变性继发性肾上腺皮质功能减退症

基于集电线圈复用的电动磁浮列车感应式电能传输技术研究

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电工技术学报 2024年第4期39卷 976-986页

作者：余嘉淇周凌云刘顺攀王州龙麦瑞坤西南交通大学电气工程学院成都611756 中国铁道科学研究院集团有限公司通信信号研究所北京100081 西南交通大学唐山研究院唐山063000

为实现电动磁浮列车低速运行阶段无接触辅助供电,同时尽可能减轻耦合机构重量,并保障供电系统平稳输出,该文设计了一种利用磁浮系统原有线圈作为耦合机构的感应式电能传输(IPT)系统,通过线圈与电路结构重构,以列车低速运行阶段空置的悬... 详细信息

为实现电动磁浮列车低速运行阶段无接触辅助供电,同时尽可能减轻耦合机构重量,并保障供电系统平稳输出,该文设计了一种利用磁浮系统原有线圈作为耦合机构的感应式电能传输(IPT)系统,通过线圈与电路结构重构,以列车低速运行阶段空置的悬浮线圈与集电线圈作为能量传输通道。由于不需额外安装能量传输线圈,所提出的IPT系统对磁浮列车自重影响小,且耦合机构在移动过程中具有互感恒定的特性,结合LCC-S谐振补偿电路,IPT系统在列车移动过程中与负载变化过程中均能保持稳压输出。为验证所提方案的可行性和有效性,搭建了1 kW的原理样机,在移动供电过程中,IPT系统输出电压波动仅1.51%,输出功率在300~1000 W范围变化时,输出电压波动为4.42%,系统整体效率为83.75%~86.61%。

关键词：电动磁浮感应式电能传输线圈复用平稳输出

In Situ-Induced Multivalent Anticancer Drug Clusters in Cancer Cells for Enhancing Drug Efficacy

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CCS Chemistry 2019年第1期1卷 97-105页

作者： lingyun zhou Fengting Lv Libing Liu Shu Wang Beijing National Laboratory for Molecular Sciences BeijingChina Key Laboratory of Organic Solids Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Increasing intracellular drug concentration is an effec-tive way for cancer chemotherapeutics to enhance efficacy and combat drug resistance.In this work,a series of anticancer drug conjugates were prepared by linking thiol-modified oligo(p-phenylene viny-lene)with paclitaxel,vincristine,teniposide,tamoxi-fen,doxorubicin,or podophyllotoxin(OPV-S-Drugs)through a Michael addition reaction.

关键词： intracellular self-assembly drug resis-tance modification of chemotherapeutic drugs reactive oxygen species

β-环糊精改性磁性棕榈纤维生物炭高效去除水中Pb(Ⅱ)

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复合材料学报 2024年第3期41卷 1378-1390页

作者：崔灿牛姣姣杨莲周凌云王环江谢雅典贵州民族大学化学工程学院贵阳550025 贵州省低维材料与环境生态治理特色重点实验室贵阳550025

为解决水体中重金属Pb(Ⅱ)污染,本文以棕榈纤维为原材料,通过化学共沉淀法制备得到β-环糊精磁性棕榈纤维生物炭(β-CD@PFMBC)用于高效去除水溶液中的Pb(Ⅱ)。通过FTIR、XRD、BET、SEM、Raman和VSM等手段对材料的结构和形貌进行了表征... 详细信息

为解决水体中重金属Pb(Ⅱ)污染,本文以棕榈纤维为原材料,通过化学共沉淀法制备得到β-环糊精磁性棕榈纤维生物炭(β-CD@PFMBC)用于高效去除水溶液中的Pb(Ⅱ)。通过FTIR、XRD、BET、SEM、Raman和VSM等手段对材料的结构和形貌进行了表征。通过单因素实验对Pb(Ⅱ)的吸附性能进行了分析,探究了吸附剂对Pb(Ⅱ)的吸附机制及回收利用性。结果表明:β-CD@PFMBC相比原始生物炭比表面积增加,表面官能团数量增多。拟二级动力学模型和Langmuir吸附等温线模型均能很好地描述对Pb(Ⅱ)的吸附过程,表明吸附过程为化学吸附和单层吸附。由Langmuir吸附等温线模型拟合得知,β-CD@PFMBC在303 K时最大理论吸附量为625.49 mg·g^(-1),明显高于原始生物炭。热力学研究表明吸附反应是自发吸热过程。β-CD@PFMBC表面的含氧基团与Pb(Ⅱ)产生了表面络合和静电相互作用。5次循环解吸后,对Pb(Ⅱ)去除率仍能达到79%以上。以上结果表明β-CD@PFMBC对水溶液中Pb(Ⅱ)的去除具有一定的应用潜力。

关键词：生物炭磁性 β-环糊精吸附 Pb(Ⅱ) 水污染

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基于系统动力学的运输结构调整政策模拟分析

铁道运输与经济 2024年第3期46卷 78-89页

作者：晁攀迪周凌云康颖丰刘柄全中国铁道科学研究院研究生部北京100081 中国铁道科学研究院集团有限公司运输及经济研究所北京100081 中铁国际多式联运有限公司北京100161

近年来综合交通运输体系稳步发展,运输方式深度融合、运输结构优化调整成为研究重点。但影响运输结构因素复杂多样,因素间反馈作用较难明晰,阻碍运输结构平稳发展。运输结构调整政策模拟仿真可有效确定变量,明确各变量作用机理。系统动... 详细信息

近年来综合交通运输体系稳步发展,运输方式深度融合、运输结构优化调整成为研究重点。但影响运输结构因素复杂多样,因素间反馈作用较难明晰,阻碍运输结构平稳发展。运输结构调整政策模拟仿真可有效确定变量,明确各变量作用机理。系统动力学作为捕捉因素间相互作用方法,处理多重反馈情景具有突出优势。为更好研究公转铁运输结构,以重庆市运输结构调整为例构建系统动力学模型,创新结合运输结构调整、运输结构调整补助、公路治超、基础设施优化、货运枢纽建设等维度,开展政策模拟研究并分析结果。研究结果表明:加强公路治超、增加基础设施投资、提升运输结构调整补助可带动多式联运周转量和内河港口货运吞吐量增长,有效降低单位货物周转量碳排放,为制定运输结构调整策略提供决策依据。

关键词：交通运输运输结构调整系统动力学政策模拟运输方式