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Structural Properties of Ions and Polyelectrolytes in Aqueous Solutions under External Electric Fields:The Sign Effect

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Chinese Journal of Polymer Science 2024年第9期42卷 1341-1352,I0007页

作者： cheng-Jiang lin Jun-Jun Wang Yuan Jiang shu-li chen Hong-Fei li Wen-Han Zhao Qing-Rong Huang Chang-Ru Rong Xiao-Zheng Duan State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026China National Key Laboratory of Advanced Vehicle Integration and Control China FAW Group Co.Ltd.Changchun130013China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200438China Department of Food Science Rutgers University65 Dudley RoadNew BrunswickNew Jersey08901USA

We utilize molecular dynamics simulations to investigate the microstructures of ions and polyelectrolytes in aqueous solutions under external electric *** focusing on the multi-body interactions between ionic components and H_(2)O molecules,as well as their responses to the external electric fields,we clarify several nontrivial molecular features of the ionic and polyelectrolyte solutions,such as the solvations of cations and anions,clustering of the ions,and dispersions/aggregations of polyelectrolyte chains,as well as the corresponding responses of H_(2)O molecules in these *** simulations illustrate the variations in structures of ionic solutions caused by reversing the charge sign of the ions,and elucidate the disparity in structures between anionic and cationic polyelectrolyte solutions in the presence of the external electric *** work clarifies the mechanism for the alternations in complex multi-body interactions in aqueous solutions caused by the application electric field,which can contribute to the fundamental understanding of the physical and chemical natures of ion-containing and charged polymeric systems.

关键词： Polyelectrolyte Ions Aqueous solutions External electric fields Asymmetric dipole

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单轴压缩下薄喷裂隙红砂岩力学性质与裂纹扩展特征分析

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岩土力学 2024年第9期45卷 2583-2594页

作者：韩勇李树忱袁超冯现大王修伟山东大学齐鲁交通学院山东济南250002 山东大学土建与水利工程学院山东济南250002 济南大学土木建筑学院山东济南250024

选取红砂岩为研究对象,采用水泥基薄喷材料,制作完整和裂隙红砂岩薄喷岩石试样,研究在单轴压缩条件下薄喷材料对完整和裂隙红砂岩强度、变形和能量演化特征的影响;采用颗粒流PFC3D软件,分析薄喷材料对不同裂隙倾角试样裂纹扩展特征的影... 详细信息

选取红砂岩为研究对象,采用水泥基薄喷材料,制作完整和裂隙红砂岩薄喷岩石试样,研究在单轴压缩条件下薄喷材料对完整和裂隙红砂岩强度、变形和能量演化特征的影响;采用颗粒流PFC3D软件,分析薄喷材料对不同裂隙倾角试样裂纹扩展特征的影响。结果表明:薄喷红砂岩试样的峰值强度和应变较无薄喷红砂岩均有提高,裂隙试样的提升系数高于完整试样;峰后阶段薄喷岩石试样内部岩石发生破坏,表面薄喷材料出现拉伸裂纹,但整体未松散。薄喷红砂岩在破坏时的总能量、弹性应变能和耗散能均高于无薄喷试样,且薄喷材料使外部输入的总能量更多转化为破坏过程所需的耗散能。PFC3D模拟结果表明,薄喷材料增强了不同倾角的裂隙试样的起裂应力和峰值强度。薄喷材料对不同裂隙倾角试样的破坏模式影响程度不同,当裂隙倾角为15º,薄喷材料可以限制峰后拉伸裂纹扩展;但当裂隙倾角为75º,有无薄喷试样的裂纹扩展模式大致相同。该研究可为薄喷材料在工程应用提供一定的参考。

关键词：薄喷材料裂隙红砂岩强度特征能量演化破坏模式裂纹扩展

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考虑温度效应的盾构刀盘黏附试验及堵塞防治

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岩土力学 2024年第8期45卷 2299-2310页

作者：王修伟李树忱刘祥坤万泽恩彭科峰山东大学岩土与地下工程研究院山东济南250014 山东大学齐鲁交通学院山东济南250002 中国矿业大学力学与土木工程学院江苏徐州221116

土压平衡盾构在黏性地层掘进时易产生刀盘结泥饼、堵塞等问题,不仅会导致排渣不畅降低掘进效率,并且频繁的开仓处理会增加工程风险,而掘进会产生大量热量影响土体黏附性。采用自主研发的刀盘旋转黏附试验系统,探究刀盘温度与含水率、黏... 详细信息

土压平衡盾构在黏性地层掘进时易产生刀盘结泥饼、堵塞等问题,不仅会导致排渣不畅降低掘进效率,并且频繁的开仓处理会增加工程风险,而掘进会产生大量热量影响土体黏附性。采用自主研发的刀盘旋转黏附试验系统,探究刀盘温度与含水率、黏土含量、黏土类型等因素联合作用下刀盘黏附效果,并分析了泡沫剂、抗黏剂在不同掺入比下堵塞防治效果。研究结果表明:温度升高会使得旋转扭矩与刀盘表面的土体黏附量降低,但会加速黏土硬化;土体含水率、黏土含量对于扭矩影响趋势相反,但对黏附量影响规律相同,随着土体含水率或黏土含量增加,黏附量先增加后降低,含水率在20%、黏土含量在30%时黏附性最强;膨润土比高岭土黏附性更强;土体含水率、黏土含量与黏土类型对于黏附量的影响可以使用稠度指数进行表征,随着稠度增加黏附量会出现先增加后降低的趋势,稠度指数在0.50~0.75时土体黏附性最强,低稠度指数土体对温度敏感性更强;单独添加泡沫剂会降低土体黏附量,但在注入比为70%时,仍存在大量土体黏附;使用泡沫剂+抗黏剂联合改良在注入比为50%时改良效果较好,继续增加注入比对土体改良效果影响较小。研究成果对于评估黏性地层土压平衡盾构掘进堵塞风险与黏性土渣土改良方案选择具有一定的指导意义。

关键词：土压平衡盾构刀盘堵塞黏性地层温度效应渣土改良

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气孔杏仁状玄武岩随机三维模型构建与单轴压缩力学行为研究

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岩土力学 2024年第4期45卷 1214-1232页

作者：周慧颖李树忱王曼灵袁超张俊艇冯健鹏山东大学齐鲁交通学院山东济南250002 山东大学岩土与结构工程研究中心山东济南250014 中国矿业大学力学与土木工程学院江苏徐州221116 山东大学土建与水利学院山东济南250014 山东东方路桥建设有限公司山东临沂276600

为了研究初始孔隙对气孔杏仁状玄武岩力学行为的影响规律,提出了一种考虑计算孔隙率、体积参数、形状参数、角度参数和构造参数的气孔杏仁状玄武岩随机三维模型构建方法,基于建立的随机模型开展了五因素五水平的单轴压缩正交数值模拟,... 详细信息

为了研究初始孔隙对气孔杏仁状玄武岩力学行为的影响规律,提出了一种考虑计算孔隙率、体积参数、形状参数、角度参数和构造参数的气孔杏仁状玄武岩随机三维模型构建方法,基于建立的随机模型开展了五因素五水平的单轴压缩正交数值模拟,分析不同模型的应力-应变曲线、破坏模式和破坏特征。结果表明:计算孔隙率、角度参数和构造参数对于岩石的单轴抗压强度和弹性模量有较大影响,岩石的单轴抗压强度和弹性模量均与计算孔隙率、角度参数呈负相关,与构造参数呈正相关,与其余因素相关性较弱;随着模型孔隙率的增加,气孔杏仁状玄武岩应力-应变曲线中塑性应变占比随之增加,破坏模式由单剪切破坏面、多剪切破坏面转为局部粉碎状破坏,岩石由脆性破坏逐渐转为延性破坏,5%和12.5%可近似作为强脆性―脆性―延性转换的临界孔隙率;建立的损伤统计本构方程能够根据初始孔隙特征较好地预测气孔杏仁状玄武岩的力学行为,对于玄武岩地层中多孔岩石力学性质的确定具有重要意义。

关键词：玄武岩多孔岩石随机建模数值模拟损伤模型

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Anomalous Ba/Ca signals associated with low temperature stresses in Porites corals from Daya Bay,northern South China Sea

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Journal of Environmental Sciences 2011年第9期23卷 1452-1459页

作者： Tianran chen Kefu Yu shu li Tegu chen Qi Shi Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

Barium to calcium （Ba/Ca） ratio in corals has been considered as a useful geochemical proxy for upwelling,river flood and other oceanic ***,recent studies indicated that additional environmental or biological factors can influence the incorporation of Ba into coral *** this study,Ba/Ca ratios of two Porites corals collected from Daya Bay,northern South China Sea were ***/Ca signals in the two corals were ‘anomalous’ in comparison with Ba behaviors seen in other near-shore corals influenced by upwelling or riverine *** Ba/Ca profiles displayed similar and remarkable patterns characterized by low and randomly fluctuating background signals periodically interrupted by sharp and large synchronous peaks,clearly indicating an environmental *** analysis indicated that the Ba/Ca profiles were not correlated with previously claimed environmental factors such as precipitation,coastal upwelling,anthropogenic activities or phytoplankton blooms in other *** maxima of Ba/Ca appeared to occur in the period of Sr/Ca maxima,coinciding with the winter minimum temperatures,which suggests that the anomalous high Ba/Ca signals were related to winter-time low sea surface *** speculated that the Ba/Ca peaks in corals of the Daya Bay were most likely the results of enrichment of Ba-rich particles in their skeletons when coral polyps retracted under the stresses of anomalous winter low *** this case,Ba/Ca ratio in relatively high-latitude corals can be a potential proxy for tracing the low temperature stress.

关键词： Ba/Ca barium Porites coral cold water stress northern South China Sea

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卸载速率对卸载诱发注浆加固节理岩体滑移行为影响的试验研究

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岩土力学 2024年第8期45卷 2397-2410页

作者：卢英瑞冯现大刘日成李树忱胡明慧董峰吉济南大学土木建筑学院山东济南250000 中国矿业大学深地工程智能建造与健康运维全国重点实验室江苏徐州221116

为研究卸载速率对水泥注浆加固节理花岗岩卸载诱发滑移行为的影响,利用TATW-2000岩石三轴试验系统对接近临界应力状态下的注浆加固节理花岗岩进行了恒轴压分级卸围压的诱发滑移试验,卸载速率分别为0.1、0.5、1、5、10 MPa/min。研究表明... 详细信息

为研究卸载速率对水泥注浆加固节理花岗岩卸载诱发滑移行为的影响,利用TATW-2000岩石三轴试验系统对接近临界应力状态下的注浆加固节理花岗岩进行了恒轴压分级卸围压的诱发滑移试验,卸载速率分别为0.1、0.5、1、5、10 MPa/min。研究表明:(1)在剪切滑移过程中,岩-浆黏结界面会相互磨损,花岗岩会在水泥断面表面留下大量微划痕。随着卸载速率升高,节理粗糙度系数(joint roughness coefficient,JRC)值分别为17.52、16.25、15.65、12.82、10.72,这表明卸载速率越大,水泥断面表面的微划痕越小。(2)各围压卸载期内的平均剪切滑移速率随卸载速率变化关系符合幂函数关系,平均剪切滑移速率随卸载速率的升高而升高,但升高速率逐渐减小。在应力-应变滞后效应的影响下,各围压保持期内的平均剪切滑移速率也随卸载速率的增加而增加。卸载速率为0.5、1、5、10 MPa/min时,围压保持期的平均剪切滑移速率远小于围压卸载期的平均剪切滑移速率;卸载速率为0.1 MPa/min时,围压卸载期和围压保持期的平均剪切滑移速率相对差距较小。(3)动态滑移的平均剪切滑移速率比蠕变滑移的平均剪切滑移速率高一个数量级。蠕变滑移和动态滑移的平均剪切滑移速率随卸载速率的升高而升高,持续时间随卸载速率的升高而减小。(4)卸载速率小于1 MPa/min时,试样发生失稳滑移时对应的围压与卸载速率呈正相关,卸载速率大于1 MPa/min时呈负相关。

关键词：岩石力学卸载诱发滑移卸载速率节理岩体剪切滑移速率

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The MELD scoring system for predicting prognosis in patients with severe hepatitis after plasma exchange treatment

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Hepatobiliary & Pancreatic Diseases International 2007年第5期6卷 492-496页

作者： Yu, Jian-Wu Wang, Gui-Qiang Zhao, Yong-Hua Sun, li-Jie Wang, shu-Qin li, shu-chen Harbin Med Coll Dept Infect Dis Affiliated Hosp 2 Harbin 150086 Peoples R China Peking Univ First Hosp Dept Infect Dis Beijing 100034 Peoples R China

BACKGROUND: Hepatic failure caused by severe hepatitis is a clinical syndrome where the major liver functions, particularly detoxification, synthetic functions, and metabolic regulation are impaired to different degrees, and may result in major life-threatening complications such as hepatic encephalopathy, ascites, jaundice, cholestasis, bleeding and hepatorenal syndrome. Plasma exchange (PE) has been found useful in treating patients with fulminant hepatic failure by removing hepatic toxins and replacement of clotting factors, so PE treatment has temporary supportive effects on liver failure caused by severe viral hepatitis. in this study, our aim was to predict the prognosis of patients with severe hepatitis after PE treatment using the end-stage liver disease (MELD) scoring system. METHODS: Two hundred and twenty patients were randomly divided into PE and control groups, and the MELD score was calculated for each patient according to the original formula. The efficacy of PE was assessed by mortality or improvement in biochemical parameters and MELD score. RESULTS: The levels of total bilirubin and international normalised ratio (INR) in patients whose MELD scores were between 30 and 39 were lower than those before PE treatment, as those in patients whose MELD scores were 40 or higher. The mortality of patients in the PE group with MELD scores from 30 to 39 was 50.0%, while it was 83.3% in the control group (Plity of patients with MELD scores higher than 40 was 90.0% in the PE group and 98.0% in the control group (P>0.05). CONCLUSIONS: PE treatment can decrease the serum total bilirubin level and INR and MELD score of patients with severe hepatitis and improve liver function. Compared with the control group, PE can significantly decrease the mortality of patients with MELD scores from 30 to 39, but has no effect in patients with MELD scores of 40 or higher.

关键词： severe hepatitis model for end-stage liver disease plasma exchange mortality

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OSMR is a potential driver of inflammation in amyotrophic lateral sclerosis

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Neural Regeneration Research 2024年第11期19卷 2513-2521页

作者： Wenzhi chen Shishi Jiang shu li cheng li Renshi Xu Department of Neurology Jiangxi Provincial People’s HospitalXiangya Hospital Jiangxi Hospital of Central South UniversityThe Clinical College of Nanchang Medical CollegeThe First Affiliated Hospital of Nanchang Medical CollegeNanchangJiangxi ProvinceChina

Amyotrophic lateral sclerosis is a neurodegenerative disease,and the molecular mechanism underlying its pathology remains poorly ***,inflammation is known to play an important role in the development of this *** identify driver genes that affect the inflammatory response in amyotrophic lateral sclerosis,as well as potential treatment targets,it is crucial to analyze brain tissue samples from patients with both sporadic amyotrophic lateral sclerosis and C9orf72-related amyotrophic lateral ***,in this study we used a network-driven gene analysis tool,NetBID2.0,which is based on SJARACNe,a scalable algorithm for the reconstruction of accurate cellular networks,to experimentally analyze sequencing data from patients with sporadic amyotrophic lateral *** results showed that the OSMR gene is pathogenic in amyotrophic lateral sclerosis and participates in the progression of amyotrophic lateral sclerosis by mediating the neuroinflammatory ***,there were differences in OSMR activity and expression between patients with sporadic amyotrophic lateral sclerosis and those with C9orf72-related amyotrophic lateral *** findings suggest that OSMR may be a diagnostic and prognostic marker for amyotrophic lateral sclerosis.

关键词： amyotrophic lateral sclerosis driver neuroinflammation OSMR C9ORF72 neurodegenerative disease pathogenesis oxidative stress protein misfolding mitochondrial dysfunction

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liver transplantation for late-onset ornithine transcarbamylase deficiency:A case report

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World Journal of Clinical Cases 2022年第18期10卷 6156-6162页

作者： Xiao-Hui Fu Yu-Hui Hu Jian-Xiang liao li chen Zhan-Qi Hu Jia-Lun Wen shu-li chen Department of Inherited Metabolic Disorders The Affiliated Hospital of China Medical University and Shenzhen Children’s HospitalShenzhen 518038Guangdong ProvinceChina Department of Neurology The Affiliated Hospital of China Medical University and Shenzhen Children’s HospitalShenzhen 518038Guangdong ProvinceChina

BACKGROUND Ornithine transcarbamylase deficiency(OTCD)is an X-linked inherited disorder and characterized by marked elevation of blood *** goal of treatment is to minimize the neurological damage caused by *** can be cured by liver transplantation(LT).Post-transplant patients can discontinue anti-hyperammonemia agents and consume a regular diet without the risk of developing *** neurological damage caused by hyperammonemia is almost *** SUMMARY An 11.7-year-old boy presented with headache,vomiting,and altered *** patient was diagnosed with late-onset *** nitrogen scavenging treatment and a protein-free diet,ammonia levels were reduced to normal on the third day of ***,the patient remained in a moderate *** discussion,LT was *** LT,the patient’s blood ammonia and biochemical indicators stabilized in the normal range,he regained consciousness,and his nervous system function significantly *** months after LT,blood amino acids and urine organic acids were normal,and brain magnetic resonance imaging showed a decrease in subcortical *** LT can significantly improve partial neurological impairment caused by late-onset OTCD hyperammonemic encephalopathy,and LT can be actively considered when early drug therapy is ineffective.

关键词： Ornithine transcarbamylase deficiency Urea cycle disorder Hyperammonemic encephalopathy liver transplantation Case report

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Simultaneous Determination of Gold and Platinum by Double Artificial Neural Network Analysis with Flow-injection Chemiluminescence

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Chinese Chemical Letters 2006年第10期17卷 1343-1346页

作者： Ming Yang liU Hai Tao ZHANG Jun Feng li shu Gui chen Hong Yan WANG College of chemistry Jilin University Changchun 130012

A highly sensitive double artificial neural network （DANN） analysis with flow-injection chemiluminescence （FI-CL） has been developed to simultaneously determine the trace amounts of the gold and platinum in simula... 详细信息

关键词： Double artificial neural networks flow-injection chemiluminescence simultaneous determination gold and platinum.

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