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身份、锚点、归属:流动青少年社会性生存的自我建构

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教育学报 2024年第1期20卷 120-132页

作者：周佳刁燕洁杭州师范大学经亨颐教育学院杭州311121 杭州师范大学中国教育现代化研究院杭州311121

随着教育政策改革走向深入,流动青少年社会性生存的制度环境不断向好。已有的主体性视角研究表明流动青少年可以能动地建构流动生活,但对于他们社会性生存中的资源与限制、采取的主体性策略等都有待深入研究。通过对城市公立高中就读的... 详细信息

随着教育政策改革走向深入,流动青少年社会性生存的制度环境不断向好。已有的主体性视角研究表明流动青少年可以能动地建构流动生活,但对于他们社会性生存中的资源与限制、采取的主体性策略等都有待深入研究。通过对城市公立高中就读的流动青少年进行深度访谈,以扎根理论构建社会性生存的理论分析框架,发现,流动青少年尝试在正式标准、社会交往、象征符号以及情感依恋的多重维度上发展社会性“锚点”。他们虽然在多维“锚点”组合中体验到差异化的归属感,但是都以将身份锚定于安全的位置为生存目标,通过自我适应、反思性的自我表达和目标取向的关系塑造等策略,逐渐实现了社会性生存的自我建构。

关键词：流动青少年社会性生存身份理论社会锚定

Multifunctional catalytic sites regulation of atomic-scale iridium on orthorhombic-CoSe_(2)for high efficiency dual-functional alkaline hydrogen evolution and organic degradation

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Journal of Energy Chemistry 2024年第5期92卷 271-281页

作者： Jingjing Huang Chenglin Zhong yanjie Xia jia Liu Guizhen Li Chao Yang jiahong Wang Qian Wang Zhenbao Zhang Feng Yan jianghua Wu Yu Deng Zhenjiang Zhou Xingchen He Paul K.Chu Woon-Ming Lau Xue-Feng Yu College of Chemistry and Chemical Engineering Linyi UniversityLinyi 276005ShandongChina Shenzhen Engineering Center for the Fabrication of Two-Dimensional Atomic Crystals Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093JiangsuChina College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058ZhejiangChina Department of Physics Department of Materials Science and EngineeringDepartment of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong KongChina

The earth-abundant and high-performance catalysts are crucial for commercial implementation of hydrogen evolution reaction(HER).Herein,a multifunctional site strategy to construct excellent HER catalysts by incorporating iridium(Ir)ions on the atomic scale into orthorhombic-CoSe2(Ir-CoSe_(2))was reported.Outstanding hydrogen evolution activity in alkaline media such as a low overpotential of 48.7 mV at a current density of 10 mA cm^(-2)and better performance than commercial Pt/C catalysts at high current densities were found in the Ir-CoSe_(2) samples.In the experiments and theoretical calculations,it was revealed that Ir enabled CoSe_(2)to form multifunctional sites to synergistically catalyze alkaline HER by promoting the adsorption and dissociation of H_(2)O(Ir sites)and optimizing the binding energy for H^(*)on Co sites.It was noticeable that the electrolytic system comprising the Ir-CoSe_(2)electrode not only produced hydrogen efficiently via HER,but also degraded organic pollutants(Methylene blue).The cell voltage of the dual-function electrolytic system was 1.58 V at the benchmark current density of 50 mA cm^(-2),which was significantly lower than the conventional water splitting voltage.It was indicated that this method was a novel strategy for designing advanced HER electrocatalysts by constructing multifunctional catalytic sites for hydrogen production and organic degradation.

关键词： Orthorhombic-CoSe_(2) Multifunctional sites design Hydrogen evolution reaction Synergistically catalyze Methylene blue oxidation

Resveratrol improves cognition and reduces oxidative stress in rats with vascular dementia

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Neural Regeneration Research 2013年第22期8卷 2050-2059页

作者： Xingrong Ma Zhikun Sun Yanru Liu yanjie jia Boai Zhang Jiewen Zhang Department of Neurology the First Affiliated HospitalZhengzhou University Department of Neurology Henan Provincial People's Hospital

Resveratrol possesses beneficial biological effects, which include anti-oxidant, anti-inflammatory and anti-carcinogenic properties. Recently, resveratrol has been shown to exhibit neuroprotective effects in models of Parkinson＇s disease, cerebral ischemia and Alzheimer＇s disease. However, its effects on vascular dementia remain unclear. The present study established a rat model of vascular dementia using permanent bilateral common carotid artery occlusion. At 8-12 weeks after model induction, rats were intragastrically administered 25 mg/kg resveratrol daily. Our results found that resveratrol shortened the escape latency and escape distances in the Morris water maze, and pro- longed the time spent percentage and swimming distance percentage in the target quadrant during the probe test, indicating that resveratrol improved learning and memory ability in vascular dementia rats. Further experiments found that resveratrol decreased malonyldialdehyde levels, and increased superoxide dismutase activity and glutathione levels in the hippocampus and cerebral cortex of vascular dementia rats. These results confirmed that the neuroprotective effects of resveratrol on vascular dementia were associated with its anti-oxidant properties.

关键词： neural regeneration traditional Chinese medicine resveratrol vascular dementia cognitive function learning and memory oxidative stress bilateral common carotid artery occlusion malonyldialde-hyde superoxide dismutase neuroregeneration

Human insulin-like growth factor 1-transfected umbilical cord blood neural stem cell transplantation improves hypoxic-ischemic brain injury

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Neural Regeneration Research 2011年第19期6卷 1445-1451页

作者： Dengna Zhu yanjie jia Jun Wang Boai Zhang Guohui Niu Yazhen Fan Rehabilitation and Treatment Center for Children with Cerebral Palsy of Henan Province Third Affiliated Hospital of Zhengzhou University Zhengzhou 450052 Henan Province China Department of Neurology First Affiliated Hospital of Zhengzhou University Zhengzhou 450052 Henan Province China

Human insulin-like growth factor 1-transfected umbilical cord blood neural stem cells were transplanted into a hypoxic-ischemic neonatal rat model via the tail vein. BrdU-positive cells at day 7 post-transplantation, as well as nestin- and neuron specific enolase-positive cells at day 14 were increased compared with those of the single neural stem cell transplantation group. In addition, the proportion of neuronal differentiation was enhanced. The genetically modified cell-transplanted rats exhibited enhanced performance in correctly crossing a Y-maze and climbing an angled slope compared with those of the single neural stem cell transplantation group. These results showed that human insulin-like growth factor 1-transfected neural stem cell transplantation promotes the recovery of the leaming, memory and motor functions in hypoxic-ischemic rats.

关键词： human insulin-like growth factor 1 neural stem cell hypoxic-ischemic brain damage transplantation neural regeneration

Bone marrow mesenchymal stem cell transplantation for treatment of spinal cord injury An in vivo magnetic resonance imaging tracking study

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Neural Regeneration Research 2011年第13期6卷 978-982页

作者： Yu Liu Boai Zhang Yi Song Yubin Deng yanjie jia Qiyong Gong Department of Neurology First Affiliated Hospital Zhengzhou University Zhengzhou 450052 Henan Province China Department of Ultrasound First Affiliated Hospital Zhengzhou University Zhengzhou 450052 Henan Province China Department of Pathophysiology Zhongshan School of Medicine Sun Yat-sen University Guangzhou 510080 Guangdong Province China Huaxi MR Research Center Department of Radiology West China Hospital of Sichuan University Chengdu 610041 Sichuan Province China

Non-invasive tracing in vivo can be used to observe the migration and distnbution of grafted stem cells, and can provide experimental evidence for treatment. This study utilized adenovirus-carrying enhanced green fluorescent protein （AD5/F35-eGFP） and superparamagnetic iron oxide （SPIO）-Iabeled bone marrow mesenchymal stem cells （BMSCs）. BMSCs, double-labeled by AD5/F35-eGFP and SPIO, were transplanted into rats with spinal cord injury via the subarachnoid space. MRI tracing results demonstrated that BMSCs migrated to the injured spinal cord over time （T2 hypointensity signals）. This result was verified by immunofluorescence. These results indicate that MRI can be utilized to trace in vivo the SPIO-labeled BMSCs after grafting.

关键词： cell labeling superparamagnetic iron oxide mesenchymal stem cells subarachnoid space spinal cord injury neural regeneration

Gastrodin blocks neural stem cell differentiation into glial cells mediated by kainic acid

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Neural Regeneration Research 2012年第12期7卷 891-895页

作者： Guifang Sun Zhihao Yuan Boai Zhang yanjie jia Yangfei Ji Xingrong Ma Yu Liu Yanru Liu Quanqing Wen Yanling Zhao Department of Neurology the First Affiliated Hospital Zhengzhou University Zhengzhou 450052 Henan Province China Department of Urology the Third People＇s Hospital of Zhengzhou Zhengzhou 450051 Henan Province China Department of Neurology the Central Hospital of Nanyang Nanyang 473009 Henan Province China

Kainic acid can simulate excitatory amino acids in vitro. Neural stem cells, isolated from newborn Wistar rats, were cultured in vitro and exposed to 100 4 000 #M kainic acid for 7 days to induce neuronal cell differentiation, causing the number of astrocytes to be significantly increased. Treatment with a combination of 0.5 mg/L gastrodin and kainic acid also caused the number of differentiated neurons to be significantly increased compared with treatment with kainic acid alone Experimental findings suggest that gastrodin reduces the excitability of kainic acid and induces neural stem cell differentiation into neurons.

关键词： kainic acid gastrodin neural stem cells differentiation

基于Chan与改进麻雀搜索算法的协同定位算法

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激光与光电子学进展 2024年第4期61卷 366-374页

作者：陈必帅王燕杰贾生尧胡思源龚培林中国计量大学机电工程学院浙江杭州310018 浙江省安全工程与技术研究重点实验室浙江杭州310012 遂昌县宏昌矿业开发有限公司浙江丽水323300

针对基于测距的无线定位技术中位置解算算法精度不高、计算效率低的问题,提出一种基于Chan与改进麻雀搜索算法的协同定位算法。首先,将Chan算法运用于到达时间(TOA)定位模型估算位置初值;其次,采用SPM复合混沌映射初始化、黄金正弦策略... 详细信息

针对基于测距的无线定位技术中位置解算算法精度不高、计算效率低的问题,提出一种基于Chan与改进麻雀搜索算法的协同定位算法。首先,将Chan算法运用于到达时间(TOA)定位模型估算位置初值;其次,采用SPM复合混沌映射初始化、黄金正弦策略、自适应权重因子、柯西-t扰动以及弹射边界处理改进麻雀搜索算法,有效提高算法的全局搜索能力和收敛精度;最后,在位置初值进行改进麻雀搜索算法迭代计算得到最终位置估计。仿真和实验结果表明,所提算法可提高无线定位精度和定位速度。

关键词：遥感麻雀搜索算法 Chan算法黄金正弦策略自适应权重因子到达时间

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从“虚气留滞”论治心房颤动

中医杂志 2024年第12期65卷 1235-1239页

作者：贾思涵连妍洁尚菊菊刘红旭首都医科大学附属北京中医医院北京市东城区100010 首都医科大学

基于“虚气留滞”阐释心房颤动的病因病机并指导治疗。认为“虚气”为心房颤动发病之本,根据病位可分为上焦心肺之宗气亏虚、中焦脾胃之中气亏虚、下焦肾之元气亏虚;瘀血、痰湿、寒湿等邪气留滞为心房颤动的病理基础,诸邪或郁而化热,或... 详细信息

基于“虚气留滞”阐释心房颤动的病因病机并指导治疗。认为“虚气”为心房颤动发病之本,根据病位可分为上焦心肺之宗气亏虚、中焦脾胃之中气亏虚、下焦肾之元气亏虚;瘀血、痰湿、寒湿等邪气留滞为心房颤动的病理基础,诸邪或郁而化热,或寒湿停聚,留滞于心脉而发病。论治时以补虚通滞为基本原则,常用清凉补气调脉汤以补宗益气、理气通脉,清凉化湿调脉汤以建中化痰、燥湿通脉,滋养温化调脉汤以培元滋阴补阳、散寒通脉。

关键词：心房颤动正气亏虚邪气留滞补虚通滞

盾构法联络通道中提高切削效率的管片弱化研究

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地下空间与工程学报 2024年第3期20卷 939-948页

作者：耿佳程雪松张天奇逯建栋宋彦杰天津大学建筑工程学院天津300354 天津大学滨海土木工程结构与安全教育部重点实验室天津300354 天津市地下铁道集团有限公司天津300392 中铁第六勘察设计院集团有限公司天津300308

盾构法联络通道施工中因洞口处临时管片难以切削,施工中存在掘进周期长、盾机姿态难控制、涌水涌砂风险高等问题,但是关于此问题解决方案的研究目前还很缺乏。因此,本文以天津某地铁盾构法联络通道项目为背景,在保证结构施工及使用期间... 详细信息

盾构法联络通道施工中因洞口处临时管片难以切削,施工中存在掘进周期长、盾机姿态难控制、涌水涌砂风险高等问题,但是关于此问题解决方案的研究目前还很缺乏。因此,本文以天津某地铁盾构法联络通道项目为背景,在保证结构施工及使用期间安全性的基础上,从弱化临时管片的角度出发,提出了3种弱化方式,分别为降低待切管片砼强度等级、减少玻璃纤维筋布筋量以及管片打孔,并利用有限元数值模拟对弱化的可能性及影响进行了研究。结果表明:(1)在3种弱化方式下,特殊衬砌环内力变化规律均为切削区内力减小,钢管片区内力增大,普通衬砌环的内力小幅度提高;(2)临时管片砼强度由C40降到C20后对衬砌环内力影响在15%以内,其中钢管片区内力增加量在5%以内;(3)主筋量减少70%以内对管片内力影响在2%以内;(4)管片内侧打孔使切削区弯矩降低30%左右,孔径与孔深尺寸相同变化量情况下,孔径对于内力影响大于孔深;(5)不同弱化方式弱化后的结构内力均在极限承载范围之内,3种弱化方式均可采用,从施工便利性和安全性角度来看,临时管片砼强度降低方案为最优方案。

关键词：盾构法联络通道特殊衬砌环钢混复合管片盾构机切削管片弱化