期刊文献+
共找到65篇文章
< 1 2 4 >
每页显示 20 50 100
Al-20%Cu多晶粒竞争生长的原位观测及汇聚型枝晶淘汰模型构建
1
作者 李发国 周莲 +4 位作者 谢玉 张佼 Mike DODGE 尹付成 孙宝德 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第7期2095-2107,共13页
采用同步辐射成像技术研究Al-20%Cu(质量分数)亚共晶合金的晶粒竞争生长动力学,并建立与实验结果相一致的数学模型。结果表明,对于发散型竞争生长,遵循“正常淘汰”规则。对于汇聚型竞争生长,成分过冷的作用加速非择优取向晶粒中一次枝... 采用同步辐射成像技术研究Al-20%Cu(质量分数)亚共晶合金的晶粒竞争生长动力学,并建立与实验结果相一致的数学模型。结果表明,对于发散型竞争生长,遵循“正常淘汰”规则。对于汇聚型竞争生长,成分过冷的作用加速非择优取向晶粒中一次枝晶臂的生长速度,导致非择优取向枝晶出现“异常淘汰”现象,淘汰择优取向枝晶。探讨汇聚型竞争生长的“正常淘汰”与“异常淘汰”之间的临界条件,建立枝晶生长速率、枝晶臂间距和枝晶倾斜角之间的数学关系,又称“二次枝晶臂阻挡模型”,可以快速预测晶界位相和淘汰类型。 展开更多
关键词 竞争生长 同步辐射成像 定向凝固 数学模型 AL-CU合金
下载PDF
激光共聚焦拉曼光谱法测定防晒剂经皮渗透作用及其应用研究
2
作者 谢宇 张少峰 +3 位作者 杨武成 谢嘉颖 范瑞芳 谭建华 《日用化学工业(中英文)》 CAS 北大核心 2024年第9期1133-1139,共7页
基于激光共聚焦拉曼光谱技术,采用皮肤成分分析仪结合多元线性回归分析方法,建立了皮肤中防晒剂深度分布及经皮渗透量的实时、在体测试方法。以志愿者手臂为实验对象,针对常见的三种防晒剂甲氧基肉桂酸乙基己酯(OMC)、二乙氨羟苯甲酰基... 基于激光共聚焦拉曼光谱技术,采用皮肤成分分析仪结合多元线性回归分析方法,建立了皮肤中防晒剂深度分布及经皮渗透量的实时、在体测试方法。以志愿者手臂为实验对象,针对常见的三种防晒剂甲氧基肉桂酸乙基己酯(OMC)、二乙氨羟苯甲酰基苯甲酸己酯(DBHB)和乙基己基三嗪酮(EHT),测试并分析了手臂不同皮肤区域经皮渗透能力的一致性,同时比较了不同配方工艺防晒乳的防晒剂经皮渗透作用。结果表明,手臂内侧的不同区域皮肤防晒剂经皮渗透量的相对标准偏差均小于15%,证明可用于不同防晒剂产品的经皮渗透对比;比较油包水防晒乳和纳米乳化工艺的防晒乳中防晒剂的经皮渗透作用,发现经过1 h的皮肤渗透,纳米乳化工艺的防晒乳相比油包水型防晒乳液,三种防晒剂在皮肤的经皮渗透量均降低约60%,而且EHT的经皮渗透深度相对更浅。该方法在防晒剂经皮渗透作用研究中得到了有效的应用,可为化妆品的经皮吸收提供方法参考。 展开更多
关键词 拉曼光谱 在体 防晒剂 经皮渗透
下载PDF
Pore structure and oxygen content design of amorphous carbon toward a durable anode for potassium/sodium-ion batteries
3
作者 Xiaodong Shi Chuancong Zhou +7 位作者 yuxin Gao Jinlin Yang yu xie Suyang Feng Jie Zhang Jing Li Xinlong Tian Hui Zhang 《Carbon Energy》 SCIE EI CAS CSCD 2024年第9期184-194,共11页
Both sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs)are considered as promising candidates in grid-level energy storage devices.Unfortunately,the larger ionic radii of K+and Na+induce poor diffusion kineti... Both sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs)are considered as promising candidates in grid-level energy storage devices.Unfortunately,the larger ionic radii of K+and Na+induce poor diffusion kinetics and cycling stability of carbon anode materials.Pore structure regulation is an ideal strategy to promote the diffusion kinetics and cyclic stability of carbon materials by facilitating electrolyte infiltration,increasing the transport channels,and alleviating the volume change.However,traditional pore-forming agent-assisted methods considerably increase the difficulty of synthesis and limit practical applications of porous carbon materials.Herein,porous carbon materials(Ca-PC/Na-PC/K-PC)with different pore structures have been prepared with gluconates as the precursors,and the amorphous structure,abundant micropores,and oxygen-doping active sites endow the Ca-PC anode with excellent potassium and sodium storage performance.For PIBs,the capacitive contribution ratio of Ca-PC is 82%at 5.0 mV s^(-1) due to the introduction of micropores and high oxygen-doping content,while a high reversible capacity of 121.4 mAh g^(-1) can be reached at 5 A g^(-1) after 2000 cycles.For SIBs,stable sodium storage capacity of 101.4 mAh g^(-1) can be achieved at 2 A g^(-1) after 8000 cycles with a very low decay rate of 0.65%for per cycle.This work may provide an avenue for the application of porous carbon materials in the energy storage field. 展开更多
关键词 oxygen doping pore structure porous carbon potassium-ion batteries sodium-ion batteries
下载PDF
Literature overview of basic characteristics and flotation laws of flocs
4
作者 Wanzhong Yin yu xie Zhanglei Zhu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第5期943-958,共16页
Flocculation flotation is the most efficient method for recovering fine-grained minerals,and its essence lies in flotation and recovery of flocs.Fundamental physical characteristics of flocs are mainly determined by t... Flocculation flotation is the most efficient method for recovering fine-grained minerals,and its essence lies in flotation and recovery of flocs.Fundamental physical characteristics of flocs are mainly determined by their apparent particle size and structure(density and morphology).Substantial researches have been conducted regarding the effect of floc characteristics on particle settling and water treatment.However,the influence of floc characteristics on flotation has not been widely studied.Based on the floc formation and flocculation flotation,this study reviews the fundamental physical characteristics of flocs from the perspectives of floc particle size and structure,summarizing the interaction between floc particle size and structure.Moreover,it thoroughly discusses the effect of floc particle size and structure on floc floatability,further revealing the influence of floc characteristics on bubble collision and adhesion and elucidating the mechanisms of interaction between flocs and bubbles.Thus,it is observed that floc particle size is not the only factor influencing flocculation flotation.Within the appropriate apparent particle size range,flocs with a compact structure exhibit higher efficiency in bubble collision and adhesion during flotation,thereby resulting in enhanced flotation performance.This study aims to provide a reference for flocculation flotation,targeting the development of more efficient and refined flocculation flotation processes in the future. 展开更多
关键词 FLOCS basic characteristics particle size and structure flotation laws BUBBLES
下载PDF
Zonal activation of molecular carbon dioxide and hydrogen over dual sites Ni-Co-MgO catalyst for CO_(2) methanation:Synergistic catalysis of Ni and Co species
5
作者 Zonglin Li Jianjun Chen +8 位作者 yu xie Junjie Wen Huiling Weng Mingxue Wang Jingyi Zhang Jinyan Cao Guocai Tian Qiulin Zhang Ping Ning 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第4期213-225,共13页
An in-depth mechanism in zonal activation of CO_(2)and H2molecular over dual-active sites has not been revealed yet.Here,Ni-Co-MgO was rationally constructed to elucidate the CO_(2)methanation mechanism.The abundant s... An in-depth mechanism in zonal activation of CO_(2)and H2molecular over dual-active sites has not been revealed yet.Here,Ni-Co-MgO was rationally constructed to elucidate the CO_(2)methanation mechanism.The abundant surface nickel and cobalt components as active sites led to strong Ni-Co interaction with charge transfer from nickel to cobalt.Notably,electron-enriched Coδ-species participated in efficient chemisorption and activation of CO_(2)to generate monodentate carbonate.Simultaneously,plentiful available Ni0sites facilitated H2dissociation,thus CO_(2)and H2were smoothly activated at zones of Coδ-species and Ni0,respectively.Detailed in situ DRIFTS,quasi situ XPS,TPSR,and DFT calculations substantiated a new formate evolution mechanism via monodentate carbonate instead of traditional bidentate carbonate based on synergistic catalysis of Coδ-species and Ni0.The zonal activation of CO_(2)and H2by tuning electron behaviors of double-center catalysts can boost heterogeneous catalytic hydrogenation performance. 展开更多
关键词 Zonal activation CO_(2) methanation Dual active sites Synergistic effect
下载PDF
A Self-Adapting and Efficient Dandelion Algorithm and Its Application to Feature Selection for Credit Card Fraud Detection
6
作者 Honghao Zhu MengChu Zhou +1 位作者 yu xie Aiiad Albeshri 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2024年第2期377-390,共14页
A dandelion algorithm(DA) is a recently developed intelligent optimization algorithm for function optimization problems. Many of its parameters need to be set by experience in DA,which might not be appropriate for all... A dandelion algorithm(DA) is a recently developed intelligent optimization algorithm for function optimization problems. Many of its parameters need to be set by experience in DA,which might not be appropriate for all optimization problems. A self-adapting and efficient dandelion algorithm is proposed in this work to lower the number of DA's parameters and simplify DA's structure. Only the normal sowing operator is retained;while the other operators are discarded. An adaptive seeding radius strategy is designed for the core dandelion. The results show that the proposed algorithm achieves better performance on the standard test functions with less time consumption than its competitive peers. In addition, the proposed algorithm is applied to feature selection for credit card fraud detection(CCFD), and the results indicate that it can obtain higher classification and detection performance than the-state-of-the-art methods. 展开更多
关键词 Credit card fraud detection(CCFD) dandelion algorithm(DA) feature selection normal sowing operator
下载PDF
合成MRI定量参数与乳腺浸润性导管癌分子分型及细胞增殖活性关系研究 被引量:3
7
作者 郑蕊 谢瑜 +2 位作者 薛珂 张冬雪 李卓琳 《中国肿瘤临床》 CAS CSCD 北大核心 2023年第14期728-732,共5页
目的:探讨合成MRI定量参数与乳腺浸润性导管癌(invasive ductal carcinoma,IDC)不同分子分型及细胞增殖活性的关系。方法:回顾性分析2020年7月至2022年2月于昆明医科大学第三附属医院就诊并经病理证实的112例乳腺IDC患者临床病理资料,... 目的:探讨合成MRI定量参数与乳腺浸润性导管癌(invasive ductal carcinoma,IDC)不同分子分型及细胞增殖活性的关系。方法:回顾性分析2020年7月至2022年2月于昆明医科大学第三附属医院就诊并经病理证实的112例乳腺IDC患者临床病理资料,均行合成MRI检查,使用ITK-SNAP软件勾画并测量病灶定量参数T1、T2及质子密度(proton density,PD)值。根据雌激素受体(estrogen receptor,ER)、孕激素受体(progesterone receptor,PR)、人类表皮生长因子受体-2(human epidermal growth factor receptor-2,HER-2)和肿瘤增殖核抗原Ki-67表达情况对病灶进行分组,比较乳腺IDC不同分子分型及细胞增殖活性的合成MRI定量参数差异。结果:112例患者中共有112个乳腺IDC病灶,其中Luminal A型40个、Luminal B型49个、HER-2过表达型8个及三阴性乳腺癌15个。ER阳性/阴性、PR阳性/阴性、HER-2阳性/阴性组之间T1、T2值差异均无统计学意义(均P>0.05),Ki-67高表达组的T1和T2值均高于低表达组(均P<0.05),Luminal A型组的T1、T2值均低于Luminal B型和三阴性乳腺癌组,HER-2过表达型组的T2值低于Luminal B型及三阴性乳腺癌组(均P<0.05)。PD值在不同分子分型及Ki-67表达水平中差异均无统计学意义(均P>0.05)。结论:合成MRI定量参数中T1、T2值对乳腺IDC不同分子分型及细胞增殖活性指标Ki-67鉴别具有一定价值,但PD值价值有限。 展开更多
关键词 磁共振成像 合成MRI 定量参数 乳腺 浸润性导管癌 分子分型 KI-67
下载PDF
新时代青年大学生课程思政教学改革的社会学思考 被引量:4
8
作者 谢建社 张民巍 谢宇 《西北成人教育学院学报》 2023年第1期5-12,共8页
推进高校青年大学生课程思政建设,加强各类课程与思政课同向同行,这种协同教育的效应就是实现全校全过程全方位培育人才,并逐渐形成独特的话语表达方式和话语体系。通过对高校青年大学生课程思政教学改革现状的分析,提出完善课程思政教... 推进高校青年大学生课程思政建设,加强各类课程与思政课同向同行,这种协同教育的效应就是实现全校全过程全方位培育人才,并逐渐形成独特的话语表达方式和话语体系。通过对高校青年大学生课程思政教学改革现状的分析,提出完善课程思政教学的方式方法,借助网络教学平台,将思政教学与专业教学、现代信息与时代需求紧密联系起来,并利用实践案例,将中国特色社会主义理论思想融入各门课程的整体。以学生为中心,引导学生把专业精神与课程精神结合起来,探索课程思政线上线下相结合的教学模式,让学生动起来,忙起来,活起来。 展开更多
关键词 新时代 青年大学生课程思政 教学改革
下载PDF
The Establishment of Mathematical Models for the Composition Analysis and Identification of Ancient Glass Products
9
作者 Jenny Zhang Ding Li +1 位作者 yu xie Junfeng Xiang 《Open Journal of Applied Sciences》 2023年第11期2149-2171,共23页
Glass is the precious material evidence of the trade of the early Silk Road. The ancient glass was easily affected by the environmental impact and weathering, and the change of composition ratios affected the correct ... Glass is the precious material evidence of the trade of the early Silk Road. The ancient glass was easily affected by the environmental impact and weathering, and the change of composition ratios affected the correct judgment of its category. In this paper, mathematical models and methods such as Chi-square test, weighted average method, principal component analysis, cluster analysis, binary classification model and grey correlation analysis were used comprehensively to analyze the data of sample glass products combined with their categories. The results showed that the weathered high-potassium glass could be divided into 12, 9, 10 and 27, 7, 22 and so on. 展开更多
关键词 Principal Component Analysis System Clustering Sensitivity Analysis Binary Classification Model Logistic Regression Analysis Grey Correlation Analysis
下载PDF
镓离子掺杂和硫空位调控的In_(2)S_(3)增强可见光下光催化生成过氧化氢
10
作者 李锋 唐小龙 +5 位作者 胡卓锋 黎相明 李方 谢宇 江燕斌 余长林 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2023年第12期253-264,共12页
过氧化氢(H_(2)O_(2))是一种绿色氧化剂,广泛用于日常生活和工业中.传统的蒽醌法制备H_(2)O_(2)的工艺流程繁琐,并且大量使用有机溶剂,对环境很不友好;小规模H_(2)O_(2)生产一般采用H2和O2直接合成,但是也存在高温、高压下使用氢气的安... 过氧化氢(H_(2)O_(2))是一种绿色氧化剂,广泛用于日常生活和工业中.传统的蒽醌法制备H_(2)O_(2)的工艺流程繁琐,并且大量使用有机溶剂,对环境很不友好;小规模H_(2)O_(2)生产一般采用H2和O2直接合成,但是也存在高温、高压下使用氢气的安全隐患.人工光催化合成H_(2)O_(2)原料(水和氧气)易得且太阳能清洁可再生,是一个非常有前景的策略.然而,在光催化过程中,电子-空穴对(e^(-)-h^(+))的高复合率大大抑制了氧还原反应(ORR)生成H_(2)O_(2)的效率.本文提出了在合成In_(2)S_(3)的金属有机框架(MOF)前驱体中加入Ga^(3+)离子(IGS5),并将IGS5在管式炉中在Ar保护下焙烧,调控S空位,制得具有高活性的Ga^(3+)离子掺杂和S空位调控的In_(2)S_(3)光催化剂.通过X射线粉末衍射和X射线光电子能谱证明了成功掺杂Ga^(3+)离子.扫描电镜、透射电镜和氮气等温吸附脱附曲线结果表明,Sv-IGS-90 (焙烧90 min)为介孔材料.紫外-可见漫反射光谱结果表明,所有催化剂均可吸收部分可见光,结合莫特肖特基曲线结果,说明催化剂的导带、价带位置均满足光催化生成H_(2)O_(2)的最低要求.采用光致发光光谱、时间分辨光致发光光谱、光电流强度曲线和电化学阻抗曲线研究了催化剂的载流子分离和重组行为.电子顺磁共振谱结果表明,Sv-IGS-90中存在S空位,结合O2程序升温解吸结果,可以推断S空位可以促进O2的吸附.计算了ORR每一步所需的热力学自由能,结果表明,Ga^(3+)离子和S空位协同作用可以提高2eORR的选择性并促进O_(2)的吸附与活化.制备的Sv-IGS5-90在异丙醇:水为1:9体系中(10vol%)连续照射(λ≥420 nm)1 h后,H_(2)O_(2)浓度达到352.58μmol L-1,是纯In_(2)S_(3)的7.5倍,450 nm处的表观量子产率为4.64%.对Sv-IGS5-90光催化产H_(2)O_(2)的机理进行了深入研究,DMPO·O_(2)^(-),DMPO·OH和TEMP ~1O_(2)信号峰表明,·O_(2)^(-),·OH,~1O_(2),e^(-)和h^(+)均参与到整个反应,说明O_(2)生成H_(2)O_(2)的途径为单电子ORR,·O_(2)^(-)首先被氧化成~1O_(2),然后生成H_(2)O_(2).综上,利用S空位调控和Ga^(3+)离子掺杂的策略可有效提高In_(2)S_(3)催化剂光催化产H_(2)O_(2)性能,为设计高性能的光催化生产H_(2)O_(2)的材料提供一定参考. 展开更多
关键词 光催化 硫化铟 过氧化氢 硫空位 镓离子
下载PDF
Knot-inspired optical sensors for slip detection and friction measurement in dexterous robotic manipulation
11
作者 Jing Pan Qi Wang +4 位作者 Shuaikang Gao Zhang Zhang yu xie Longteng yu Lei Zhang 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2023年第10期45-53,共9页
Friction plays a critical role in dexterous robotic manipulation.However,realizing friction sensing remains a challenge due to the difficulty in designing sensing structures to decouple multi-axial forces.Inspired by ... Friction plays a critical role in dexterous robotic manipulation.However,realizing friction sensing remains a challenge due to the difficulty in designing sensing structures to decouple multi-axial forces.Inspired by the topological mechanics of knots,we construct optical fiber knot(OFN)sensors for slip detection and friction measurement.By introducing localized self-contacts along the fiber,the knot structure enables anisotropic responses to normal and frictional forces.By employing OFNs and a change point detection algorithm,we demonstrate adaptive robotic grasping of slipping cups.We further develop a robotic finger that can measure tri-axial forces via a centrosymmetric architecture composed of five OFNs.Such a tactile finger allows a robotic hand to manipulate human tools dexterously.This work could provide a straightforward and cost-effective strategy for promoting adaptive grasping,dexterous manipulation,and human-robot interaction with tactile sensing. 展开更多
关键词 robotic perception adaptive grasping slip detection force decoupling polymer optical fiber
下载PDF
牙膏去除外源性色斑功效评价方法的标准化研究
12
作者 王继才 简锐东 +3 位作者 谢宇 陈晓斌 周艺 谭建华 《日用化学工业(中英文)》 CAS 北大核心 2023年第9期1101-1107,共7页
建立了一种评价牙膏去除外源性色斑功效的标准化体外测试方法。以牛牙作为底物,L^(*)a^(*)b^(*)色空间作为牙齿颜色的评价体系,通过染色-刷磨-测试的流程对牙膏样品的去除外源性色斑效果进行测定。对方法的关键参数进行系统优化,最终确... 建立了一种评价牙膏去除外源性色斑功效的标准化体外测试方法。以牛牙作为底物,L^(*)a^(*)b^(*)色空间作为牙齿颜色的评价体系,通过染色-刷磨-测试的流程对牙膏样品的去除外源性色斑效果进行测定。对方法的关键参数进行系统优化,最终确定染色后L*值[40,50]区间的牛牙,使用L8-Ⅱ刷磨仪配套平型的中毛牙刷,刷磨频率100次/min进行600次刷磨等方法条件,建立了标准化的测试方法。结果表明该方法能有效区分不同配方样品间的差异,实验批次间相对标准偏差(RSD)小于10%,结果重现性较好。该方法具有成本低、实验周期短、操作简单等特点,为牙膏美白去渍的功效宣称提供可靠、科学的技术支撑。 展开更多
关键词 牙膏 外源性色斑 去除 功效评价
下载PDF
MicroRNA-30a、microRNA-181a在原发免疫性血小板减少症中的表达及其临床意义 被引量:4
13
作者 谭琳 谢瑜 +1 位作者 杨坚 黄颖 《中国现代医学杂志》 CAS 北大核心 2021年第24期63-68,共6页
目的检测原发免疫性血小板减少症(ITP)患者外周血单个核细胞(PBMC)microRNA-30a(miR-30a)、microRNA-181a(miR-181a)的表达,并分析其临床意义。方法选取2020年1月—2020年12月昆明医科大学第一附属医院收治的ITP患者48例作为ITP组,另取... 目的检测原发免疫性血小板减少症(ITP)患者外周血单个核细胞(PBMC)microRNA-30a(miR-30a)、microRNA-181a(miR-181a)的表达,并分析其临床意义。方法选取2020年1月—2020年12月昆明医科大学第一附属医院收治的ITP患者48例作为ITP组,另取同期该院40例化疗后骨髓抑制血小板减少患者作为对照组,体检健康者45例作为健康组。检测3组血小板计数(PLT)、平均血小板体积(MPV),采用实时荧光定量聚合酶链反应检测PBMC中miR-30a、miR-181a的表达,分析miR-30a、miR-181a与血小板参数的相关性,以及对ITP的诊断价值。结果ITP组miR-30a、miR-181a相对表达量高于对照组和健康组(P<0.05);ITP组PLT、MPV低于对照组和健康组(P<0.05)。miR-30a与PLT、MPV呈负相关(r=-0.278和-0.247,P<0.05),与出血分级呈正相关(r=0.221,P<0.05);miR-181a与PLT、MPV呈负相关(r=-0.224和-0.301,P<0.05),与出血分级呈正相关(r=0.236,P<0.05)。miR-30a[O^R=1.876(95%CI:1.230,6.336)]和miR-181a[O^R=2.665(95%CI:1.365,8.558)]升高是发生ITP的独立危险因素(P<0.05)。以miR-30a、miR-181a及其回归系数建立临床模型的多元回归方程Logistic(P)=-4.115+1.305×MPV-1.258×miR-30a-1.664×miR-181a。该临床模型诊断ITP的标准误为0.055,AUC为0.889(95%CI:0.662,0.956),敏感性为75.25%(95%CI:1.123,2.084)、特异性为88.24%(95%CI:1.672,2.583)。结论miR-30a、miR-181a与ITP发生相关,通过miR-30a、miR-181a建立个体化临床模型可准确判断ITP的发生,且具有较高的临床实用价值。 展开更多
关键词 原发免疫性血小板减少症 microRNA-30a microRNA-181a 临床模型 预测
下载PDF
肺腺癌软脑膜转移患者的脑脊液和血液中不同的基因突变谱:基于循环肿瘤DNA的液体活检 被引量:4
14
作者 李会颖 谢宇 +2 位作者 林永娟 俞婷婷 尹震宇 《中国肺癌杂志》 CAS CSCD 北大核心 2020年第8期646-654,共9页
背景与目的软脑膜转移(leptomeningeal metastasis,LM)是晚期非小细胞肺癌(non-small cell lung cancer,NSCLC)的一种严重并发症,通常预后较差。对于驱动基因阳性的NSCLC患者,表皮生长因子受体酪氨酸激酶抑制剂(epidermal growth factor... 背景与目的软脑膜转移(leptomeningeal metastasis,LM)是晚期非小细胞肺癌(non-small cell lung cancer,NSCLC)的一种严重并发症,通常预后较差。对于驱动基因阳性的NSCLC患者,表皮生长因子受体酪氨酸激酶抑制剂(epidermal growth factor receptor-tyrosine kinase inhibitors,EGFR-TKIs)是治疗的首选,但常伴随着无法解决的耐药问题。本研究旨在探讨NSCLC-LM患者的脑脊液(cerebrospinal fluid,CSF)和血液中不同的基因突变谱及突变丰度,筛查相关耐药基因,以期能精确指导个体化的治疗。方法采用二代基因测序(next generation sequencing,NGS)的液体活检技术,检测、对比分析TKI耐药后NSCLC患者同期的外周血及脑脊液中的循环肿瘤DNA(circulating tumor DNA,ct DNA)。结果共纳入18例NSCLC伴有LM的患者,基础突变中11例(61.11%)为EGFR,6例(33.33%)为间变性淋巴瘤激酶(anaplastic lymphoma kinase,ALK),1例(5.56%)为原癌基因酪氨酸蛋白激酶ROS(ROS protooncogene 1,receptor tyrosine kinase,ROS1),伴随突变中肿瘤蛋白P53(tumor protein p53 gene,TP53)、间质-上皮细胞转化因子(mesenchymal-epithelial transition factor,MET)检出率相对较高。CSF样本的靶向基因突变检出率明显高于外周血(100.00%vs 66.67%,P=0.006),且基础突变基因的CSF丰度均明显高于血浆样本(P<0.001)。CSF样本检测出丰富的单核苷酸变异(single-nucleotide variations,SNV)和拷贝数变异(copy number variants,CNV),数量均多于血液样本;且相较于只接受过单一TKI治疗的患者,使用多种TKI后脑脊液和血液中会产生更多的SNV突变。结论NSCLC-LM患者CSF中的ct DNA,相较于外周血,能更加准确、全面地反映出LM的真实基因突变状态,在指导用药、耐药监测、预后评估等方面具有广泛的应用前景,可作为液体活检的优选。 展开更多
关键词 肺肿瘤 软脑膜转移 脑脊液 循环肿瘤DNA 二代基因测序
下载PDF
Comparison of intra-articular injection of parecoxib vs oral administration of celecoxib for the clinical efficacy in the treatment of early knee osteoarthritis 被引量:13
15
作者 Lu Lu yu xie +1 位作者 Ke Gan Xiao-Wen Huang 《World Journal of Clinical Cases》 SCIE 2019年第23期3971-3979,共9页
BACKGROUND Non-steroid anti-inflammatory drugs(NSAIDs)have played a crucial role in the treatment of osteoarthritis,especially in the early stages.However,the cardiovascular risk and adverse gastrointestinal reactions... BACKGROUND Non-steroid anti-inflammatory drugs(NSAIDs)have played a crucial role in the treatment of osteoarthritis,especially in the early stages.However,the cardiovascular risk and adverse gastrointestinal reactions of oral NSAIDs in elderly people cannot be underestimated.Intra-articular injection of NSAIDs may be a new attempt for early knee osteoarthritis treatment.Parecoxib may be a suitable drug for intra-articular injection.AIM To observe the clinical efficacy of the intra-articular injection of parecoxib for early knee osteoarthritis.METHODS Early knee osteoarthritis patients(n=110)were retrospectively analyzed.These patients were divided into three groups:Basic treatment+oral glucosamine(group A,n=37),oral celecoxib+basic treatment+oral glucosamine(group B,n=37),and intra-articular injection of parecoxib+basic treatment+oral glucosamine(group C,n=36).Intra-articular injection of parecoxib was performed once every 2 wk at a dose of 40 mg each time,for three times total.The three groups were compared in terms of visual analogue scale(VAS)scores,Hospital for Special Surgery(HSS)scores and patient satisfaction before and after treatment.The levels of inflammatory cytokines in the synovial fluid were detected in the three groups before and after treatment.RESULTS All patients were followed up for an average of 15.5±2.7 mo.The clinical efficacy was estimated by VAS and HSS scores at 12 mo after treatment.Inflammatory cytokine levels in the synovial fluid were evaluated at 3 mo after treatment.VAS and HSS scores were significantly improved in each group compared with before(P<0.001).There were significant differences among the three groups in VAS and HSS scores(P<0.001).The clinical efficacy of group C was superior to that of groups A and B(P<0.001),while group B outperformed group A in this respect(P<0.001).The patient satisfaction was the highest in group C(P<0.001).After treatment,the levels of tumor necrosis factorα(TNF-α)and interleukin(IL)-6 in the synovial fluid decreased in each group compared with before(P<0.001),while the levels of IL-10 increased(P<0.001).The three groups differed significantly in the levels of TNF-a,IL-6 and IL-10 in the synovial fluid after treatment(P<0.001).CONCLUSION For patients with early knee osteoarthritis,intra-articular injection of parecoxib could effectively improve clinical symptoms.This method may be a reliable alternative for early knee osteoarthritis. 展开更多
关键词 Knee OSTEOARTHRITIS INTRA-ARTICULAR injection PARECOXIB NON-STEROID ANTIINFLAMMATORY drugs
下载PDF
Titanium mesh for bone augmentation in oral implantology: current application and progress 被引量:30
16
作者 yu xie Songhang Li +2 位作者 Tianxu Zhang Chao Wang Xiaoxiao Cai 《International Journal of Oral Science》 SCIE CAS CSCD 2020年第4期275-286,共12页
Guided bone regeneration(GBR)is an effective and simple method for bone augmentation,which is often used to reconstruct the alveolar ridge when the bone defect occurs in the implant area.Titanium mesh has expanded the... Guided bone regeneration(GBR)is an effective and simple method for bone augmentation,which is often used to reconstruct the alveolar ridge when the bone defect occurs in the implant area.Titanium mesh has expanded the indications of GBR technology due to its excellent mechanical properties and biocompatibility,so that the GBR technology can be used to repair alveolar ridges with larger bone defects,and can obtain excellent and stable bone augmentation results.Currently,GBR with titanium mesh has various clinical applications,including different clinical procedures.Bone graft materials,titanium mesh covering methods,and titanium mesh fixing methods are also optional.Moreover,the research of GBR with titanium mesh has led to multifarious progresses in digitalization and material modification.This article reviews the properties of titanium mesh and the difference of titanium mesh with other barrier membranes;the current clinical application of titanium mesh in bone augmentation;common complications and management and prevention methods in the application of titanium mesh;and research progress of titanium mesh in digitization and material modification.Hoping to provide a reference for further improvement of titanium mesh in clinical application and related research of titanium mesh. 展开更多
关键词 TITANIUM TITANIUM MESH
下载PDF
Hard tissue stability after guided bone regeneration: a comparison between digital titanium mesh and resorbable membrane 被引量:13
17
作者 Songhang Li Junyi Zhao +3 位作者 yu xie Taoran Tian Tianxu Zhang Xiaoxiao Cai 《International Journal of Oral Science》 SCIE CAS CSCD 2021年第4期389-397,共9页
Guided bone regeneration(GBR)uses resorbable and non-resorbable membranes as biological barriers.This study compared the differences in hard tissue stability between GBR using evidence-based digital titanium mesh and ... Guided bone regeneration(GBR)uses resorbable and non-resorbable membranes as biological barriers.This study compared the differences in hard tissue stability between GBR using evidence-based digital titanium mesh and resorbable collagen membranes during implant placement.A total of 40 patients(65 implant sites)were enrolled and divided into two groups:resorbable membrane and digital titanium mesh groups.The alveolar bone was analyzed at two-and three-dimensional levels using conebeam computed tomography and by reconstructing and superimposing the hard tissues at four time points:preoperatively,postoperatively,before second-stage surgery,and 1 year after loading.The use of digital titanium mesh showed less alveolar bone resorption in vertical and horizontal directions two-dimensionally before the second-stage surgery and 1 year after loading.Regarding volumetric stability,the percentage of resorption after 6 months of healing with resorbable membrane coverage reached 37.5%.However,it was only 23.4%with titanium mesh.Although postoperative bone volume was greater at all labial sites with resorbable membrane than with digital titanium mesh,after substantial bone resorption within 1 year of loading,the labial bone thickness at the upper part of implants was thinner with resorbable membrane than with digital titanium mesh.Furthermore,digital titanium meshes made according to ideal bone arch contour reduced soft tissue irritation,and the exposure rate was only 10%.Therefore,although both resorbable membrane and digital titanium mesh in GBR were able to successfully reconstruct the bone defect,digital titanium meshes were better at maintaining the hard tissue volume in the osteogenic space. 展开更多
关键词 TITANIUM STABILITY MESH
下载PDF
Laser direct writing and characterizations of flexible piezoresistive sensors with microstructures 被引量:13
18
作者 Chenying Zhang Wei Zhou +6 位作者 Da Geng Cheng Bai Weida Li Songyue Chen Tao Luo Lifeng Qin yu xie 《Opto-Electronic Advances》 SCIE 2021年第4期16-26,共11页
Functional materials with high viscosity and solid materials have received more and more attentions in flexible pressure sensors,which are inadequate in the most used molding method.Herein,laser direct writing(LDW)met... Functional materials with high viscosity and solid materials have received more and more attentions in flexible pressure sensors,which are inadequate in the most used molding method.Herein,laser direct writing(LDW)method is proposed to fabricate flexible piezoresistive sensors with microstructures on PDMS/MWCNTs composites with an 8%MWCNTs mass fraction.By controlling laser energy,microstructures with different geometries can be obtained,which significantly impacts the performances of the sensors.Subsequently,curved microcones with excellent performance are fabricated under parameters of f=40 kHz and v=150 mm·s^(-1).The sensor exhibits continuous multi-linear sensitivity,ultrahigh original sensitivity of 21.80%kPa^(-1),wide detection range of over 20 kPa,response/recovery time of~100 ms and good cycle stability for more than 1000 times.Besides,obvious resistance variation can be observed when tiny pressure(a peanut of 30 Pa)is applied.Finally,the flexible piezoresistive sensor can be applied for LED brightness controlling,pulse detection and voice recognition. 展开更多
关键词 flexible pressure sensor piezoresistive sensor MICROSTRUCTURE laser processing
下载PDF
Circulating myeloid-derived suppressor cells in patients with pancreatic cancer 被引量:5
19
作者 Xiao-Dong Xu Jun Hu +5 位作者 Min Wang Feng Peng Rui Tian Xing-Jun Guo yu xie Ren-Yi Qin 《Hepatobiliary & Pancreatic Diseases International》 SCIE CAS CSCD 2016年第1期99-105,共7页
BACKGROUND: Myeloid-derived suppressor cells (MDSCs) are heterogeneous cell types that suppress T-cell responses in cancer patients and animal models, some MDSC subpopulations are increased in patients with pancrea... BACKGROUND: Myeloid-derived suppressor cells (MDSCs) are heterogeneous cell types that suppress T-cell responses in cancer patients and animal models, some MDSC subpopulations are increased in patients with pancreatic cancer. The present study was to investigate a specific subset of MDSCs in patients with pancreatic cancer and the mechanism of MDSCs increase in these patients. METHODS: Myeloid cells from whole blood were collected from 37 patients with pancreatic cancer, 17 with cholangiocarcinoma, and 47 healthy controls. Four pancreatic cancer cell lines were co- cultured with normal peripheral blood mononudear cells (PBMCs) to test the effect of tumor cells on the conversion of PBMCs to MDSCs. Levels of granulocyte-macrophage colony-stimulating factor (GM-CSF) and arginase activity in the plasma of cancer patients were analyzed by enzyme-linked immunosorbent assay. RESULTS: CD14+/CD11b+/HLA-DR MDSCs were increased in patients with pancreatic or bile duct cancer compared with those in healthy controls, and this increase was correlated with clinical cancer stage. Pancreatic cancer cell lines induced PBMCs to MDSCs in a dose-dependent manner. GM-CSF and arginase activity levels were significantly increased in the se rum of patients with pancreatic cancer. CONCLUSIONS: MDSCs were tumor related: tumor cells induced PBMCs to MDSCs in a dose-dependent manner and circulating CD14+/CD11b+/HLA-DR- MDSCs in pancreatic cancer patients were positively correlated with tumor burden. MDSCs might be useful markers for pancreatic cancer detection and progression. 展开更多
关键词 pancreatic cancer myeloid-derived suppressor cells granulocyte- macrophage colony-stimulating factor ARGINASE
下载PDF
Sepsis3.0定义下脓毒症中医证型分布特点及与预后的相关性研究 被引量:11
20
作者 陈雪梅 余勰 +4 位作者 张贵方 何艳萍 周飞露 何雪旭 何琪 《中国中医急症》 2020年第11期1926-1929,共4页
目的观察Sepsis3.0定义下的脓毒症患者中医卫气营血证候分布特点及与预后的相关性。方法采用回顾性研究,纳入154例符合Sepsis1.0定义的脓毒症患者,按是否符合Sepsis3.0诊断标准分为两组,调查其卫气营血辨证证候信息及相关临床资料,分析... 目的观察Sepsis3.0定义下的脓毒症患者中医卫气营血证候分布特点及与预后的相关性。方法采用回顾性研究,纳入154例符合Sepsis1.0定义的脓毒症患者,按是否符合Sepsis3.0诊断标准分为两组,调查其卫气营血辨证证候信息及相关临床资料,分析两组患者卫气营血辨证证型分布特点;分析Sepsis3.0诊断条件下,患者卫气营血辨证证候与序贯器官衰竭估计(SOFA)评分、急性生理与慢性健康状况(APACHEⅡ)评分及预后的关系。结果154例患者中,符合Sepsis3.0定义者共有128例,卫分证0例,气分证54例,营分证46例,血分证28例;符合Sepsis1.0但不符合Sepsis3.0的患者共有26例,其中卫分证20例,气分证6例。与观察组相比,对照组卫分证比例明显增多(P<0.05);而在观察组中,气分证比例最大,营分证其次,血分证患者死亡率高于非血分证患者(P<0.05)。结论Sepsis3.0定义下,脓毒症患者卫气营血辨证以气分证最为多见,随着疾病的进展,病机演变从肺卫邪正交争逐渐演变为营血俱伤,而血分证预后最差。与Sepsis1.0相比,Sepsis3.0诊断更符合脓毒症脏器功能损伤的内涵。 展开更多
关键词 脓毒症 Sepsis3.0 中医辨证 SOFA APACHEⅡ
下载PDF
上一页 1 2 4 下一页 到第
使用帮助 返回顶部