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市场规范化治理背景下课外补习对初中生学业成绩的影响

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成都师范学院学报 2021年第6期37卷 43-50页

作者：孙慧宇陈纯槿赵唯杜华东师范大学教育学部上海200062

基于中国教育追踪调查基线数据,利用倾向得分匹配法探究语文、英语及数学课外补习对初中生相应学科成绩的影响,并重点对学科差异进行比较。研究发现,英语和数学补习可以显著提高学生英语和数学成绩,且英语补习效果更优;语文补习对学生... 详细信息

基于中国教育追踪调查基线数据,利用倾向得分匹配法探究语文、英语及数学课外补习对初中生相应学科成绩的影响,并重点对学科差异进行比较。研究发现,英语和数学补习可以显著提高学生英语和数学成绩,且英语补习效果更优;语文补习对学生语文成绩无显著影响。一方面,建议学校进行分层教学,提升教学质量;有效利用课后时间开展答疑活动;引导学生理性补习。另一方面,应通过立法规范、行政监管、网络监督等方式推进课外补习的规范化管理。

关键词：中学生课外补习学业成绩 CEPS 倾向得分匹配法

手术室器械相关压力性损伤预防的最佳证据总结

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护理学杂志 2024年第13期39卷 56-60页

作者：李贝陈红袁丁张春瑾洪博洋华中科技大学同济医学院附属同济医院手术室湖北武汉430030 华中科技大学同济医学院护理学院华中科技大学同济医学院附属同济医院麻醉科湖北武汉430030

目的检索、评价并整合手术患者器械相关压力性损伤预防的相关证据,为临床实践提供参考。方法系统检索国内外计算机决策支持系统、指南网、压力性损伤专业学术网站以及综合数据库中关于预防手术患者器械相关压力性损伤的相关文献,文献类... 详细信息

目的检索、评价并整合手术患者器械相关压力性损伤预防的相关证据,为临床实践提供参考。方法系统检索国内外计算机决策支持系统、指南网、压力性损伤专业学术网站以及综合数据库中关于预防手术患者器械相关压力性损伤的相关文献,文献类型包括临床决策、指南、专家共识、证据总结、系统评价、Meta分析、随机对照试验。检索时限为建库至2023年10月。循证团队对文献进行方法学质量评价,并根据主题对证据进行提取与汇总。结果共纳入10篇文献,其中指南3篇、专家共识4篇、系统评价2篇、随机对照试验1篇。从风险评估、器械的选择和使用、预防策略、术后交接与记录、教育与培训5个方面总结出23条最佳证据。结论整合的手术患者器械相关压力性损伤预防最佳证据为医护人员提供了循证依据,但证据使用者应基于前期充分的风险评估,结合手术室具体情境调整预防策略,以降低器械相关压力性损伤发生率。

关键词：手术室器械相关压力性损伤预防体位敷料风险评估证据总结循证护理

HETEROCLINIC BIFURCATIONS OF A PREY-PREDATOR FISHERY MODEL WITH IMPULSIVE HARVESTING

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International Journal of Biomathematics 2013年第5期6卷 85-99页

作者： chunjin WEI LANSUN chen Science College Jimei UniversityXiamen Fujian 361021 P. R. China Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 P. R. China

In this paper, we consider a prey-predator fishery model with Allee effect and state- dependent impulsive harvesting. First, we investigate the existence of order-1 heteroclinic cycle. Second, choosing p as a control parameter, we obtain the sufficient conditions for the existence and uniqueness of order-1 periodic solution of system （2.3） by using the geometry theory of semi-continuous dynamic systems. Finally, on the basis of the theory of rotated vector fields, heteroclinic bifurcation to perturbed system of system （2.3） is also studied. The methods used in this paper are novel to prove the existence of order-1 heteroclinic cycle and heteroclinic bifurcations.

关键词： Rotated vector fields successor function heteroclinic cycle heteroclinicbifurcations periodic solution.

Effects of interfacial residual stress on mechanical behavior of SiC_(f)/SiC composites

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Journal of Advanced Ceramics 2022年第1期11卷 94-104页

作者： Xiaowu chen Guofeng chenG Jinshan YANG Jianbao HU chunjin LIAO Xiangyu ZHANG Shaoming DONG State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Structural Ceramics and Composites Engineering Research Center Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Analysis and Testing Center for Inorganic Materials Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China

Layer-structured interphase,existing between reinforcing fiber and ceramics matrix,is an indispensable constituent for fiber-reinforced ceramic composites due to its determinant role in the mechanical behavior of the ***,the interphase may suffer high residual stress because of the mismatch of thermal expansion coefficients in the constituents,and this can exert significant influence on the mechanical behavior of the ***,the residual stress in the boron nitride(BN)interphase of continuous SiC fiber-reinforced SiC composites was measured using a micro-Raman *** effects of the residual stress on the mechanical behavior of the composites were investigated by correlating the residual stress with the mechanical properties of the *** results indicate that the residual stress increases from 26.5 to 82.6 MPa in tension as the fabrication temperature of the composites rises from 1500 to 1650℃.Moreover,the increasing tensile residual stress leads to significant variation of tensile strain,tensile strength,and fiber/matrix debonding mode of the *** sublayer slipping of the interphase caused by the residual stress should be responsible for the transformation of the mechanical *** work can offer important guidance for residual stress adjustment in fiber-reinforced ceramic composites.

关键词： ceramic matrix composites Raman spectroscopy mechanical properties residual stress

具有增强一致性和透气性的无基底超薄表皮生物电极用于长期生理监测

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Science China Materials 2024年第5期67卷 1481-1490页

作者：李冠军公彦婷方诗镪游通邵瑞瑞姚兰前刘晨武春锦牛坚赖文勇 State Key Laboratory of Organic Electronics and Information Displays(SKLOEID) Institute of Advanced Materials(IAM)School of Chemistry and Life SciencesNanjing University of Posts&TelecommunicationsNanjing210023China

开发耐用且可靠的生物电极,用以采集高质量的生物电信号,已成为人体生理状态监测和人机交互领域的关键技术.然而,现有的生物电极多基于传统弹性基底,这导致了机械性能不匹配和低渗透性等问题,并且缺乏与生物皮肤类似的多方面属性和必要... 详细信息

开发耐用且可靠的生物电极,用以采集高质量的生物电信号,已成为人体生理状态监测和人机交互领域的关键技术.然而,现有的生物电极多基于传统弹性基底,这导致了机械性能不匹配和低渗透性等问题,并且缺乏与生物皮肤类似的多方面属性和必要的协同特性.本研究中,我们报道了一种新型的基于自支撑导电全聚合物薄膜的超薄表皮生物电极(ASU-EBE).该电极将超一致性、优异的拉伸性和透气性集成于一体,展现了约475 S cm^(-1)的高导电性,约48%的出色拉伸性,与生物组织界面的超一致性以及优异的透气性.该电极的电子和机械性能得到提升,这归功于在PEDOT:PSS中引入水溶性聚氧化乙烯,以调节分子间π-π堆积距离,并促进纳米纤维结构的形成.因此,ASU-EBE在与皮肤接触时的阻抗远低于标准凝胶电极,使其成为复杂日常环境下长期医疗监测的理想选择.

关键词： flexible bioelectronics epidermal bioelectrodes freestanding conductive films conformality breathability

精细化管理在手术室骨科外来器械与植入物中的应用

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中国临床护理 2024年第5期16卷 305-307页

作者：陈红李贝张春瑾钟浩刘静华中科技大学同济医学院附属同济医院手术室武汉430030

目的探讨精细化管理在骨科外来器械与植入物管理中的应用效果。方法将2022年1月-3月进行的1275例骨科植入物手术设为对照组,将2022年4月-6月进行的骨科植入物手术1023例设为干预组,对照组采用常规的骨科手术配合管理模式,干预组采用精... 详细信息

目的探讨精细化管理在骨科外来器械与植入物管理中的应用效果。方法将2022年1月-3月进行的1275例骨科植入物手术设为对照组,将2022年4月-6月进行的骨科植入物手术1023例设为干预组,对照组采用常规的骨科手术配合管理模式,干预组采用精细化管理模式。结果干预组外来器械与植入物管理质量均明显高于对照组(均P<0.05),术中清点意外事件发生率显著低于对照组(P<0.05)。结论精细化管理能有效实施骨科外来器械与植入物的环节控制,显著提升外来器械与植入物管理质量,同时降低术中清点意外事件发生率。

关键词：多部门协同精细化管理骨科手术外来器械植入物

Residual stress variation in SiC_(f)/SiC composite during heat treatment and its effects on mechanical behavior

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Journal of Advanced Ceramics 2020年第5期9卷 567-575页

作者： Xiaowu chen Guofeng chenG Junmin ZHANG Feiyu GUO Haijun ZHOU chunjin LIAO Hongda WANG Xiangyu ZHANG Shaoming DONG State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Structural Ceramics and Composites Engineering Research Center Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Analysis and Testing Center for Inorganic Materials Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China School of Physical Science and Technology ShanghaiTech UniversityShanghai 200031China

Residual stress originated from thermal expansion mismatch determines the mechanical properties of ceramic matrix composites(CMCs).Here,continuous SiC fiber reinforced SiC matrix(SiC_(f)/SiC)composites were fabricated by nano-infiltration and transient eutectic-phase(NITE)method,and the residual stress of the composites was investigated using high-temperature Raman *** temperature increasing from room temperature to 1400℃,the residual stresses of the matrix and the fiber decrease from 1.29 to 0.62 GPa and from 0.84 to 0.55 GPa in compression respectively,while that of the interphase decreases from 0.16 to 0.10 GPa in *** variation of residual stress shows little effect on the tensile strength of the composites,while causes a slight decrease in the tensile *** suppression of fiber/matrix debonding and fiber pulling-out caused by the residual stress reduction in the interphase is responsible for the decreasing tensile *** work can open up new alternatives for residual stress analysis in CMCs.

关键词： residual stress nano-powder infiltration and transient eutectoid(NITE) Raman spectroscopy mechanical properties

Dichotomous roles of neutrophils in modulating pathogenic and repair processes of inflammatory bowel diseases

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Precision Clinical Medicine 2021年第4期4卷 246-257页

作者： Huimin chen Xiaohan Wu chunjin Xu Jian Lin Zhanju Liu Center for Inflammatory Bowel Disease Research the Shanghai Tenth People’s HospitalTongji University School of MedicineShanghai 200072China Department of Gastroenterology the First People’s Hospital of Shangqiu City Affiliated to Xinxiang Medical UniversityShangqiu 476100China Department of Gastroenterology Affiliated Hospital of Putian UniversityPutian 351106China

Neutrophils are considered as complex innate immune cells and play a critical role in maintaining intestinal mucosal *** exert robust pro-inflammatory effects and recruit other immune cells in the acute phase of pathogen infection and intestinal inflammation,but paradoxically,they also limit exogenousmicrobial invasion and facilitate mucosal *** or dysfunction of neutrophils results in abnormal immune responses,leading to multiple autoimmune and inflammatory diseases including systemic lupus erythematosus,rheumatoid arthritis,and inflammatory bowel diseases(IBD).As a refractory intestinal inflammatory disease,the pathogenesis and progression of IBD are associated with complicated immune response processes in which neutrophils are profoundly ***,the consensus on potential roles of neutrophils in modulating pathogenic and repair processes of IBD remains not fully *** infiltrating neutrophils cross the epithelial barrier and contribute to microbial dysbiosis,aggravated intestinal architectural damage,compromised resolution of intestinal inflammation and increased risk of thrombosis during ***,activated neutrophils are also associated with effective elimination of invaded microbiota,promoted angiogenesis and tissue restoration of gutmucosa in ***,we discuss the beneficial and detrimental roles of neutrophils in the onset and resolution of intestinalmucosal inflammation,hoping to provide a precise overview of neutrophil functions in the pathogenesis of IBD.

关键词： neutrophil innate immune cell inflammatory bowel disease intestinal inflammation mucosal homeostasis immune response microbial dysbiosis

大众-宝来汽车发动机控制系统故障设置盒的设计与教学应用

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汽车实用技术 2024年第17期49卷 146-149页

作者：吴科甲陈辉淦林凤功苏春锦孙帅福建信息职业技术学院智能制造学院福建福州350003

为有效提高学校新能源汽车专业群教师、学生对汽车发动机电控系统故障检修的实践水平,文章以大众-宝来汽车为载体,师生共研设计发动机电控系统教学故障设置盒一套,以方便教师实训教学和学生技能比赛训练。该故障设置盒可以灵活设置线路... 详细信息

为有效提高学校新能源汽车专业群教师、学生对汽车发动机电控系统故障检修的实践水平,文章以大众-宝来汽车为载体,师生共研设计发动机电控系统教学故障设置盒一套,以方便教师实训教学和学生技能比赛训练。该故障设置盒可以灵活设置线路断路、短路、对调、虚接等,模拟真实故障维修过程。设计流程如下:首先依据大众-宝来电路图,梳理发动机电脑板线束;其次设计故障设置盒尺寸和针脚的排版方式;然后在电脑板上焊接线束并在线束焊接结束后检测其导通性;最后将带有故障设置盒的教学用车与原车进行功能验证,验证所设计教学用车故障设置盒的有效性。

关键词：发动机电控系统故障设置教学应用