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Penumbra-targeted CircOGDH siRNA-loaded nanoparticles alleviate neuronal apoptosis in focal brain ischaemia

Stroke & Vascular Neurology 2024年第2期9卷 134-144,I0396-I0413页

作者： Yanfang Liu tianyuan zhang Xing Zou Zhongwen Yuan Yufeng Li Jiankun Zang Niu He Lizhen He Anding Xu Dan Lu Department of Neurology and Stroke Center Jinan University First Affiliated HospitalGuangzhouGuangdongChina Department of Clinical Neuroscience Institute The First Affiliated Hospital of Jinan UniversityGuangzhouGuangdongChina Key Lab of Guangzhou Basic and Translational Research of Pan-vascular Diseases The First Affiliated Hospital of Jinan UniversityGuangzhouChina

Background Nanoparticles(NPs)are a class of substances that can be loaded with therapeutic agents delivered to specific *** our earlier research,we identified a neuron-derived circular RNA(circRNA),circular oxoglutarate dehydrogenase(CircOGDH),as a promising therapeutic target for acute ischaemic *** study dedicated to explore a prospective preliminary strategy of CircOGDH-based NP delivered to the ischaemic penumbra region in middle cerebral artery occlusion/reperfusion(MCAO/R)*** Immunofluorescence in primary cortex neurons and in vivo fluorescence imaging revealed endocytosis of Poly(lactide-co-glycolide)(PLGA)poly amidoamine(PAMAM)@CircOGDH small interfering RNA(siRNA)*** blotting analysis and CCK8 assay were performed to evaluate the apoptotic level in ischaemic neurons treated with PLGA–PAMAM@CircOGDH siRNA *** reverse transcription PCR experiments,mice behaviour test,T2 MRI analysis,Nissl and TdT-mediated dUTP nick end labeling(TUNEL)co-staining were performed to evaluate the apoptosis level of ischaemic penumbra neurons in MCAO/R *** evaluation of NPs in MCAO/R mice was detected by blood routine examination,liver and kidney function examination and HE *** PLGA–PAMAM@CircOGDH siRNA NPs were successfully *** of PLGA–PAMAM@CircOGDH siRNA NPs in ischaemic neurons alleviated neuronal apoptotic level in vitro and in ***,mice behaviour test showed that the neurological defects of MCAO/R mice were significantly alleviated after the tail injection of PLGA–PAMAM@CircOGDH siRNA NPs,and no toxic effects were *** In conclusion,our results suggest that PLGA–PAMAM@CircOGDH siRNA NPs can be delivered to the ischaemic penumbra region and alleviate neuron apoptosis in MCAO/R mice and in ischaemic neurons;therefore,our study provides a desirable approach for using circRNA-based NPs for the treatment of ischaemic stroke.

关键词： OGD routine loaded

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基于SDP和改进SAM⁃MobileNetv2的滚动轴承故障诊断方法研究

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机械强度 2024年第4期46卷 787-794页

作者：张天缘孙虎儿朱继扬赵扬中北大学机械工程学院太原030051

针对传统的滚动轴承故障诊断方法难以准确高效的实现故障分类,提出了一种融合对称点模式(Symmetrized Dot Pattern,SDP)和改进SAM⁃MobileNetv2的滚动轴承故障分类方法。首先,将轴承振动信号通过SDP算法转化为含有丰富特征信息的二维图... 详细信息

针对传统的滚动轴承故障诊断方法难以准确高效的实现故障分类,提出了一种融合对称点模式(Symmetrized Dot Pattern,SDP)和改进SAM⁃MobileNetv2的滚动轴承故障分类方法。首先,将轴承振动信号通过SDP算法转化为含有丰富特征信息的二维图像。然后,将二维图像输入到改进SAM⁃MobileNetv2网络模型中,对故障特征信息进行提取和分类。在改进SAM⁃MobileNetv2网络中,使用自适应激活函数ACON(Activate or not)对SAM⁃MobileNetv2中的ReLU6激活函数进行替换,提高模型分类性能。最后,将本模型与多种网络模型做对比。试验结果表明,本模型可以准确高效地实现对滚动轴承故障的分类,使用凯斯西储大学轴承故障数据的准确率为99.5%,使用渥太华大学轴承故障数据的准确率为97.2%。

关键词：滚动轴承对称点模式 SAM⁃MobileNetv2模型故障诊断

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悬滴微萃取-高分辨连续光源石墨炉原子吸收光谱法测定高纯石墨中的超痕量金

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岩矿测试 2024年第5期43卷 734-743页

作者：肖芳张田园张丽萍刘璐毛香菊倪文山中国地质科学院郑州矿产综合利用研究所河南郑州450006 国家非金属矿资源综合利用工程技术研究中心河南郑州450006 自然资源部多金属矿综合利用评价重点实验室河南郑州450006

准确测定高纯石墨中的超痕量金,难点是如何在最大程度地减少样品前处理过程中器皿、试剂、材料、环境及设备所引入的二次污染的前提下,实现对样品溶液中超痕量金(0.1~1ng/mL)的有效分离和高倍富集。本文建立了铂皿中灰化、酸解、磷酸三... 详细信息

准确测定高纯石墨中的超痕量金,难点是如何在最大程度地减少样品前处理过程中器皿、试剂、材料、环境及设备所引入的二次污染的前提下,实现对样品溶液中超痕量金(0.1~1ng/mL)的有效分离和高倍富集。本文建立了铂皿中灰化、酸解、磷酸三丁酯悬滴微萃取的方法用于高纯石墨中超痕量金分析。首先于铂皿中高温灼烧除去样品中的固定碳,然后采用氢氟酸-王水-高氯酸将灰分消解完全制备成样品溶液,再以微升级磷酸三丁酯悬滴作为萃取剂,分离富集样品溶液中的金,最后采用高分辨连续光源石墨炉原子吸收光谱法(GFAAS)对悬滴中的金进行测定。实验结果表明,使用2.5μL磷酸三丁酯悬滴(氯仿体积为20%)作为萃取剂,在10%盐酸介质的样品溶液中萃取金2min,对金的富集倍数可达283倍。在实验条件下,金的质量浓度在0.1~2.0ng/mL范围内与其吸光度呈良好的线性关系,相关系数r为0.999,检出限为0.11ng/g,样品溶液中一定量的共存元素(如钠、镁、铝)对金的测定无干扰。按照实验方法测定5个高纯石墨实际样品中的金含量,测定结果的相对标准偏差(RSD,n=6)为1.5%~4.9%,加标回收率为94.9%~105.3%。

关键词：高纯石墨悬滴微萃取磷酸三丁酯石墨炉原子吸收光谱法超痕量金

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山西省数字物流、经济增长与生态环境协调发展研究

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运城学院学报 2024年第4期42卷 10-16页

作者：邓椿张恬缘董洁芳运城学院经济管理系运城学院文化旅游系山西运城044000

数字物流、经济增长与生态环境协调发展是衡量区域可持续发展的关键。本文利用2014—2021年山西省11个地级市的面板数据,构建了数字物流、经济增长与生态环境协调发展的综合指标体系,并采用熵权法、耦合度模型及耦合协调度模型,评估各... 详细信息

数字物流、经济增长与生态环境协调发展是衡量区域可持续发展的关键。本文利用2014—2021年山西省11个地级市的面板数据,构建了数字物流、经济增长与生态环境协调发展的综合指标体系,并采用熵权法、耦合度模型及耦合协调度模型,评估各市的耦合协调发展水平。研究结果表明:(1)从综合发展指数看,晋北地区综合发展指数总体偏低,但呈上升趋势。晋中地区各市综合评价指数稳步增长,太原市最高。晋南地区各市综合评价指数上升速率差异较大,运城市最高。(2)两两系统耦合分析,数字物流与经济增长的协调性在11个市中相对较低,尤其是阳泉市在2014—2021年间协调性较差。(3)三个系统的耦合度逐年提升,以太原市的协调度最佳。基于此,建议加快物流网络构建、推进物流数字化发展及加强各市协同发展。

关键词：数字物流经济增长生态环境耦合协调度山西省

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抗磷脂综合征误诊为神经精神性狼疮1例并文献复习

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中风与神经疾病杂志 2024年第9期41卷 839-842页

作者：张强余楠楠张天元王常明邓伟哲中国人民解放军联勤保障部队第九六二医院中医风湿科黑龙江哈尔滨150048 中国人民解放军空军军医大学第一附属医院中医科陕西西安710032 哈尔滨医科大学附属第四医院神经内科黑龙江哈尔滨150001

抗磷脂综合征和神经精神性狼疮在中枢神经系统受累时,临床症状及辅助检查相似,但诊疗策略不同,容易误诊误治。本文分析误诊原因并文献复习。回顾经中国人民解放军联勤保障部队第九六二医院收治的1例以血小板减少、脑卒中为首发症状的病... 详细信息

抗磷脂综合征和神经精神性狼疮在中枢神经系统受累时,临床症状及辅助检查相似,但诊疗策略不同,容易误诊误治。本文分析误诊原因并文献复习。回顾经中国人民解放军联勤保障部队第九六二医院收治的1例以血小板减少、脑卒中为首发症状的病例,初诊为“神经精神性狼疮”,给予羟氯喹、糖皮质激素及吗替麦考酚酯诱导缓解,并给予阿司匹林抗血小板聚集。后患者出现磷脂抗体谱阳性及静脉血栓形成,修诊为“抗磷脂综合征”,给予羟氯喹及小剂量糖皮质激素维持治疗,并给予低分子肝素抗凝-吲哚布芬抗血小板聚集序贯治疗,随访5个月患者病情稳定未复发。抗磷脂综合征与神经精神性狼疮在首发症状及血栓事件的判断是早期诊断的关键。吲哚布芬作为阿司匹林的替代方案在抗磷脂综合征的远期疗效值得进一步探讨。

关键词：抗磷脂综合征神经精神性狼疮血小板减少阿司匹林吲哚布芬

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Novel data-driven sparse polynomial chaos and analysis of covariance for aerodynamics of compressor cascades with dependent geometric uncertainties

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Chinese Journal of Aeronautics 2024年第6期37卷 89-108页

作者： Zhengtao GUO Wuli CHU Haoguang zhang tianyuan JI School of Power and Energy Northwestern Polytechnical UniversityXi’an 710072China

Polynomial Chaos Expansion(PCE)has gained significant popularity among engineers across various engineering disciplines for uncertainty ***,traditional PCE suffers from two major ***,the orthogonality of polynomial basis functions holds only for independent input variables,limiting the model’s ability to propagate uncertainty in dependent ***,PCE encounters the"curse of dimensionality"due to the high computational cost of training the model with numerous polynomial *** practical manufacturing,compressor blades are subject to machining precision limitations,leading to deviations from their ideal geometric *** deviations require a large number of geometric parameters to describe,and exhibit significant *** efficiently quantify the impact of high-dimensional dependent geometric deviations on the aerodynamic performance of compressor blades,this paper firstly introduces a novel approach called Data-driven Sparse PCE(DSPCE).The proposed method addresses the aforementioned challenges by employing a decorrelation algorithm to directly create multivariate basis functions,accommodating both independent and dependent random ***,the method utilizes an iterative Diffeomorphic Modulation under Observable Response Preserving Homotopy regression algorithm to solve the unknown coefficients,achieving model sparsity while maintaining fitting ***,the study investigates the simultaneous effects of seven dependent geometric deviations on the aerodynamics of a high subsonic compressor cascade by using the DSPCE method proposed and sensitivity analysis of *** joint distribution of the dependent geometric deviations is determined using Quantile-Quantile plots and normal copula functions based on finite measurement *** results demonstrate that the correlations between geometric deviations significantly impact the variance of aerodynamic performance and the flow ***,

关键词： Data-driven sparse polyno-mial chaos Analysis of covariance Dependent uncertainty Aerodynamic performance Compressor cascade

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Sub-nanopores-containing N,O-codoped porous carbon from molecular-scale networked polymer hydrogel for solid-state supercapacitor

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Chinese Chemical Letters 2021年第3期32卷 1111-1116页

作者： Meiling Wang tianyuan zhang Mingzhu Cui Weifeng Liu Xuguang Liu Jianwei Zhao Jiadong Zhou Institute of New Carbon Materials Taiyuan University of TechnologyTaiyuan 030024China College of Material and Textile Engineering Jiaxing UniversityJiaxing 314001China Department of Chemistry University of WashingtonSeattleWashington 98195United States School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Institute of Crystalline Materials Shanxi UniversityTaiyuan 030006China

A template-free carbonization-activation route is developed to fabricate sub-nanopore-containing porous carbon by using a novel polypyrrole(PPy)hydrogel as a *** design of PPy hydrogel precursor containing molecular-scale grids(diameter~2.0 nm)allows for homogeneous N,O-codoping into the porous carbon scaffold during the pyrolysis process.A subsequent activation step produces activated porous carbons(APCs)with tailored pore structures,which renders the APCs abundant subnanopores on their surface to increase the specific capacitance as extra capacitance *** with large specific surface area and abundant heteroatoms,the optimized APC4/1 displays excellent specific capacitance of 379 F/g for liquid-state supercapacitor and 230 F/g for solid-state *** solid-state supercapacitor shows a high energy density of 22.99 Wh/kg at power density of 420 W/kg,which is higher than most reported porous carbon materials and satisfy the urgent requirements of elementary power source for electric ***,this method can be easily modified to fabricate sub-nanopore-containing porous carbons with preferred structures and compositions for many applications.

关键词： Hydrogel Sub-nanopores Carbonization-activation Porous carbon Heteroatomdoping Solid-state supercapacitor

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Investigation of non-uniform leading-edge tubercles in compressor cascade:Based on multi-objective optimization and data mining

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Chinese Journal of Aeronautics 2024年第7期37卷 134-152页

作者： Jiezhong DONG Wuli CHU Haoguang zhang Bo LUO tianyuan JI Ziyun zhang School of Power and Energy Northwestern Polytechnical UniversityXi’an 710129China

Corner stall receives noticeable attention in the aeroengine field as an important phenomenon in highly-load ***-uniform leading-edge tubercles,as an effective method to delay stall,are introduced into the *** this paper,the shape of leading-edge tubercles was controlled by a third-order Fourier *** judge corner stall,a more precise stall indicator for compressor cascade with flow control methods was ***,the total kinetic energy of the secondary flow at large incidence was adopted as a parameter for stall evaluation to save computing *** results of multiobjective optimization reveal that the loss coefficient exhibited negligible variation at design incidence,while the total kinetic energy of secondary flow showed a significant reduction at large incidence,resulting in a substantial increase in stall *** the optimal profiling cases,the stall incidencewas delayed from 7.9°to 11.6°.The major purpose of the research is to provide proper design guidelines for nonuniformleading-edge tubercles and uncover the flow controlmechanisms of leading-edge ***,the geometric features that meet different optimization objectives were extracted through geometric analysis near the Pareto Front and through Self-OrganizingMap(SOM)dataminingmethods in the optimization ***,flow field analysis reveals the flow control mechanism of leading-edge *** convex-concave-convex structure at the 0%-70%blade height region can form two branches of leading-edge vortex pairs that are opposite in the rotation direction to the passage *** two branches of leading-edge vortex pairs mixed with the leading-edge separation vortex to form two stronger mixed vortices,which can effectively suppress the development of passage vortex and delay stall incidence.

关键词： Corner stall Non-uniform leading-edge tubercles Stall indicator Stall evaluation parameter Mixed vortex

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虎杖苷抗氧化活性研究进展

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天津中医药大学学报 2024年第4期43卷 333-340页

作者：靳亚静党玲玲陈希瑜张田圆王彧邵瑞天津中医药大学中西医结合学院天津301617 组分中药国家重点实验室天津301617 天津中医药大学中医药研究院天津301617

虎杖苷是从中药虎杖的干燥根茎中提取的单体化合物,是白藜芦醇的葡糖苷衍生物。现代药理学研究发现,虎杖苷在许多生物过程中发挥重要作用,包括氧化应激、炎症和细胞凋亡等。与白藜芦醇相比,虎杖苷因具有更高的抗氧化活性和生物利用度受... 详细信息

虎杖苷是从中药虎杖的干燥根茎中提取的单体化合物,是白藜芦醇的葡糖苷衍生物。现代药理学研究发现,虎杖苷在许多生物过程中发挥重要作用,包括氧化应激、炎症和细胞凋亡等。与白藜芦醇相比,虎杖苷因具有更高的抗氧化活性和生物利用度受到广泛关注。近年来研究发现虎杖苷可以显著改善多种氧化应激相关疾病,如神经退行性疾病、糖尿病、心血管相关疾病等。文章就虎杖苷在多种临床常见疾病中的抗氧化作用进行综述,以期为虎杖苷的后续研究及开发利用提供参考。

关键词：虎杖虎杖苷抗氧化应用作用机制

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RESEARCH ON PRODUCT INNOVATION DESIGN IN VIRTUAL PRODUCT DEVELOPMENT

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Chinese Journal of Mechanical Engineering 2002年第4期15卷 353-359页

作者： Wu Qunbo zhang Linxuan Xiao tianyuan Long Xinghai State CIMS Engineering Research Center, Tsinghua University, Beijing 100084, China State CIMS Engineering Research Center Tsinghua University Beijing 100084 China

An integrated template of virtual product development alters primarilysequential tradition mode of product life cycle. The template integrates all processes of productdevelopment using digital modem. An environment of virtual product development provides productdevelopment environment of integration, communion, network, concurrent and collaboration. Combiningdevelopment of new rapier loom, an innovated design process is researched in virtual productdevelopment, which consists three portions: constructing an integration development environment,innovation design and manufacturing simulation. The innovated design process realizes reversedesign, mechanism concept design, structural design and analysis, performance analysis andmanufacturing process simulation of virtual product, which can enhance greatly product performanceand reduce cost and development cycle of new product.

关键词： virtual product development innovation design product data management

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