检索结果-南通市图书馆

Advances in Manufacturing 2024年第2期12卷 288-299页

作者： Zhao-Qing Zhang Kai-Ning Shi yao-yao Shi Yi-Hui song Zhe He ya-song Pu School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an710072People’s Republic of China Key Laboratory of High Performance Manufacturing for Aero Engine(Northwestern Polytechnical University) Ministry of Industry and Information TechnologyXi’an710072People’s Republic of China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine(Northwestern Polytechnical University) Ministry of EducationXi’an710072People’s Republic of China

Profile grinding is the most crucial method for the ultra-precision machining of special-shaped ***,profile grinding produces a unique machining profile,and many random factors in the machining process lead to complex surface *** this study,the structural and probabilistic characteristics of the profile grinding of a special-shaped surface were analyzed,and a probabilistic algorithm for the forming and 3D characterization of special-shaped surfaces under profile grinding was *** forming process of a GH738 blade tenon tooth surface was considered as an example to demonstrate the *** comparison results showed that the simulation results had similar surface characteristics to the measurement results,and the relative error range of the 3D roughness parameter was 0.21%–19.76%,indicating an accurate prediction and characterization of the complex special-shaped surface under the action of multiple factors.

关键词： Special-shaped surface Profile grinding Surface morphology 3D characterization

Integrated interconnected porous and lamellar structures realized fast ion/electron conductivity in high-performance lithium-sulfur batteries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第6期35卷 161-167页

作者： ya song Mingxia Zhou Zhu Chen Huali Nie Jiao-Jing Shao Guangmin Zhou School of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Medical College of Guizhou University Guiyang 550025China College of Biological Science and Medical Engineering Donghua UniversityShanghai 201620China Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

The practical application of high-energy-density lithium-sulfur(Li-S)batteries have been highly praised for energy storage devices,while are largely hindered by the“shuttling effect”.Herein,core-shell carbon spheres composed of interlinked porous core and lamellar shell were designed to restrain the polysulfide *** microporous structure with pore size of around 1 nm effectively trap lithium ***,the interconnected porous core shortens the ion transfer distance and the lamellar carbon shell endows the carbon spheres with fast electron conduction,finally facilitating polysulfide conversion ***,the Li-S batteries with the carbon spheres as the interlayer show high discharge specific capacity of 1002 m Ah/g at 2 C with 574 m Ah/g remaining after 600 cycles,and high areal capacity of 5.48 m Ah/cm^(2) with sulfur loading of 4.67 mg/cm^(2) at 0.1 *** corresponding pouch cells also exhibit stable cycling stability with an initial discharge specific capacity of 1082 m Ah/g at 0.1 C.

关键词： Interlayer Shuttle effect Strong adsorption Porous carbon spheres Lithium-sulfur batteries

Pollution source identification methods and remediation technologies of groundwater: A review

在线全文

学校读者我要写书评

暂无评论

China Geology 2024年第1期7卷 125-137页

作者： ya-ci Liu Yu-hong Fei ya-song Li Xi-lin Bao Peng-wei Zhang Fujian Provincial Key Laboratory of Water Cycling and Eco-Geological Processes Institute of Hydrogeology and Environmental GeologyChinese Academy of Geological SciencesXiamen 361000China Key Laboratory of Water and Soil Resources Conservation and Restoration in the Middle and Lower Reaches of Yellow River Basin MNRZhengzhou 450016China

Groundwater is an important source of drinking *** pollution severely endangers drinking water safety and sustainable social *** the case of groundwater pollution,the top priority is to identify pollution sources,and accurate information on pollution sources is the premise of efficient ***,an appropriate pollution remediation scheme should be developed according to information on pollution sources,site conditions,and economic *** methods for identifying pollution sources mainly include geophysical exploration,geochemistry,isotopic tracing,and numerical *** these identification methods,only the numerical modeling can recognize various information on pollution sources,while other methods can only identify a certain aspect of pollution *** remediation technologies of groundwater can be divided into in-situ and ex-situ remediation technologies according to the remediation *** in-situ remediation technologies enjoy low costs and a wide remediation range,but their remediation performance is prone to be affected by environmental conditions and cause secondary *** ex-situ remediation technologies boast high remediation efficiency,high processing capacity,and high treatment concentration but suffer high *** methods for pollution source identification and remediation technologies are applicable to different *** achieve the expected identification and remediation results,it is feasible to combine several methods and technologies according to the actual hydrogeological conditions of contaminated sites and the nature of ***,detailed knowledge about the hydrogeological conditions and stratigraphic structure of the contaminated site is the basis of all work regardless of the adopted identification methods or remediation technologies.

关键词： Groundwater pollution Identification of pollution sources Geophysical exploration identification Geochemistry identification Isotopic tracing Numerical modeling Remediation technology Hydrogeological conditions Hydrogeological survey engineering

Two-dimensional silica enhanced solid polymer electrolyte for lithium metal batteries

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第2期85卷 146-154页

作者： Zhihong Luo Weiyong Li Chong Guo ya song Mingxia Zhou yan Shi Jing Xu Long Li Bin Shi Quansheng Ouyang Jiao-jing Shao Guangmin Zhou School of Materials and Metallurgy Guizhou UniversityGuiyang550025China State Key Laboratory of Advanced Chemical Power Sources Zunyi563003China Graphene Materials Engineering Research Center of Guizhou Colleges and Universities Guiyang550025China Tsinghua-Berkeley Shenzhen Institute&Tsinghua Shenzhen International Graduate Schoo Tsinghua UniversityShenzhen518055China

Solid polymer electrolytes(SPEs)are promising substitutes for current flammable liquid electrolytes to achieve high-safety and high-energy-density lithium metal *** oxide(PEO)based solid polymer electrolytes have attracted increasing attention because of their excellent flexibility,manufacturability,light weight,and low-cost processing,while they often suffer from low ionic con-ductivity at room temperature,low lithium transference number and unsatisfactory interfacial resis-tance,which largely restrain their practical ***,two-dimensional holey silica nanosheets(2D-HSN)as the fillers,together with LiNO_(3) as the electrolyte additive,are introduced in a PEO/poly(-vinylidene fiuoride-co-hexafluoropropylene)(PVDF-HFP)blended polymer matrix to obtain a *** incorporation of HSN filler creates supplementary channels for lithium ion migration and lowers the crystallinity of the polymer,thereby facilitating the movement of lithium *** HSN-based SPE demonstrates higher ionic conductivity up to 3.7 x 10-4 S cm-1 at 30℃,larger Li+transference number close to 0.34,and more stable lithium plating/stripping than that without the fillers,and HSN can promote the formation of more stable solid electrolyte interphase(SEI)*** as-assembled LiFePO4||Li batteries deliver a high specific capacity of 159 mA h g-1 with the capacity retention of 95.5%after 200 cycles at 30℃,as well as superior rate performance and cycling stability compared to that using the blank SPE.

关键词： Vermiculite nanosheets Two-dimensional silica Solid polymer electrolytes FillersLithium metal batteries

Modifiable factors mediating the effects of educational attainment on gestational diabetes mellitus: A two-step Mendelian randomization study

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第26期12卷 5937-5945页

作者： Ming-Yue Ma ya-song Zhao Department of Nursing Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

BACKGROUND Although there is currently a wealth of evidence to indicate that maternal educational attainment is associated with gestational diabetes mellitus(GDM),the specific modifiable risk factors that mediate the causal relationship between these two variables have yet to be *** To identify the specific modifiable risk factors that mediate the causal relationship between the level of maternal education and *** Mendelian randomization(MR)was conducted using data from genome-wide association studies of European *** initially performed a two-sample MR analysis using data on genetic variants associated with the duration of education as instruments,and subsequently adopted a two-step MR approach using metabolic and lifestyle factors as mediators to examine the mechanisms underlying the relationship between the level of maternal education and risk of developing *** addition,we calculated the proportions of total causal effects mediated by identified metabolic and lifestyle *** A genetically predicted higher educational attainment was found to be associated with a lower risk of developing GDM(OR:0.71,95%CI:0.60-0.84).Among the metabolic factors assessed,four emerged as potential mediators of the education-GDM association,which,ranked by mediated proportions,were as follows:Waist-to-hip-ratio(31.56%,95%CI:12.38%-50.70%),body mass index(19.20%,95%CI:12.03%-26.42%),high-density lipoprotein cholesterol(12.81%,95%CI:8.65%-17.05%),and apolipoprotein A-1(7.70%,95%CI:4.32%-11.05%).These findings proved to be robust to sensitivity *** Our findings indicate a causal relationship between lower levels of maternal education and the risk of developing GDM can be partly explained by adverse metabolic profiles.

关键词： Educational status Gestational diabetes mellitus Metabolism Lifestyle factors Mendelian randomization analysis

从《史记》看西汉“是”与“此”语法功能的异同

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

湖北大学学报（哲学社会科学版） 2024年第3期51卷 97-105,F0003页

作者：宋亚云北京大学中文系北京100871

在《史记》的统计语料中,“是”有形容词、系词、指示代词,“是”和“此”有指示代词作主语、宾语、定语等六个方面的功能。观察“是”和“此”的这些功能,可以看出:“是”可以充当形容词、系词,充当指示代词作谓语,而“此”都不能;“... 详细信息

在《史记》的统计语料中,“是”有形容词、系词、指示代词,“是”和“此”有指示代词作主语、宾语、定语等六个方面的功能。观察“是”和“此”的这些功能,可以看出:“是”可以充当形容词、系词,充当指示代词作谓语,而“此”都不能;“此”的指代性比“是”要强;“此”和“是”作主语时,都可以后接谓词性谓语,但“是”后接谓词性谓语占绝对优势;“此”作动词宾语、定语的比例则均高于“是”。系词“是”的形成可能与其指示代词和形容词用法都有关系,而“此”不具备形容词用法,因此不能发展为系词。

关键词： “是” “此” 《史记》语法功能

在线全文

学校读者我要写书评

暂无评论

绸缪束楚,三星在户:《夏小正》岁首星象考

民俗研究 2024年第2期 80-89,159页

作者：刘宗迪宋亚北京语言大学文学院北京100083

历法的发展历程,最早是物候历,其次是观象授时的星象历,最后才有基于天文观测而推算确立的成熟历法。物候历时期,根据特定物候现象确定新年的日期;星象历时期,则根据特定星象的出现确定新年的日期。《夏小正》反映了中国古代历法从物候... 详细信息

历法的发展历程,最早是物候历,其次是观象授时的星象历,最后才有基于天文观测而推算确立的成熟历法。物候历时期,根据特定物候现象确定新年的日期;星象历时期,则根据特定星象的出现确定新年的日期。《夏小正》反映了中国古代历法从物候历到星象历的过渡,它记载一月星象“初昏参中”,表明当时是以参宿昏中为岁首星象,作为新年到来的标志。甲骨学研究证明,商代历法是以大火星黄昏南中天的夏历五月作为正月,夏主参星、商主大火的传说即反映了夏人以参星昏中为岁首星象、商人以大火昏中为岁首星象的纪时传统。

关键词：夏小正岁首参宿历法

芍药甘草汤通过调节NDUFS1表达抑制巨噬细胞向M1极化缓解小鼠溃疡性结肠炎

在线全文

学校读者我要写书评

暂无评论

生物化学与生物物理进展 2024年第5期51卷 1174-1190页

作者：夏侯志楷肖红宋亚锋韩君北京体育大学中国运动与健康研究院北京100084 北京体育大学运动人体科学学院北京100084 北京康仁堂药业有限公司中药研究院北京101301

目的本研究旨在探索并阐明芍药甘草汤(Shakuyakukanzoto,SKT)通过调节巨噬细胞的能量代谢和极化来改善小鼠溃疡性结肠炎(ulcerative colitis,UC)的可能作用机制。方法通过给予3%葡聚糖硫酸钠盐(dextran sulfate sodium salt,DSS)构建小... 详细信息

目的本研究旨在探索并阐明芍药甘草汤(Shakuyakukanzoto,SKT)通过调节巨噬细胞的能量代谢和极化来改善小鼠溃疡性结肠炎(ulcerative colitis,UC)的可能作用机制。方法通过给予3%葡聚糖硫酸钠盐(dextran sulfate sodium salt,DSS)构建小鼠UC模型并通过灌胃SKT进行治疗。首先,对两个数据集GSE21157和GSE210415进行单细胞测序分析和代谢通路富集。其次,对UC小鼠腹腔巨噬细胞的提取和代谢组学验证。然后,根据标准逆方差加权两样本的单变量孟德尔随机化分析差异代谢物富集的通路和UC风险相关性。接着,分析在GSE128682和GSE102746数据集转录水平差异。最后,使用定量反转录PCR(qRT-PCR)、蛋白质印迹法(Western blot)和流式细胞术验证结果。结果苏木精-伊红(HE)染色结果显示,SKT可以显著缓解DSS引起的结肠损伤。单细胞测序分析在肠壁中发现了巨噬细胞、NK细胞、T细胞等10多种不同类型的细胞。在疾病组中,通过比较这两组数据发现,有49条主要涉及能量代谢的巨噬细胞代谢途径的活性显著上调。能量代谢组学中,治疗组与模型组,模型组与空白组分别鉴定了10种和18种显著上调和下调的差异表达代谢物,这些差异表达的代谢物主要与糖酵解和氧化磷酸化有关。根据标准逆方差加权两样本的单变量孟德尔随机化分析,预测糖酵解和氧化磷酸化相关基因泛醌NADH脱氢酶Fe-S蛋白1(recombinant NADH dehydrogenase ubiquinone Fe-S protein 1,NDUFS1)(OR:0.56,95%CI:0.48~0.98,P=0.000068)与UC风险降低相关。通过对两组数据集转录水平差异分析,与正常组相比,UC中NDUFS1的转录水平降低。qRT-PCR、Western blot和流式细胞术验证结果显示,SKT可以促进NDUFS1蛋白的表达,抑制巨噬细胞向M1型极化。此外,敲低/过表达NDUFS1可以影响SKT对巨噬细胞M1型极化的影响。结论SKT通过调节NDUFS1蛋白水平,抑制巨噬细胞向M1型极化,从而缓解小鼠UC。这些发现不仅揭示了SKT对UC的治疗机制,也为临床应用提供了新的理论基础。

关键词：芍药甘草汤巨噬细胞M1型极化氧化磷酸化溃疡性结肠炎

档案信息资源优化与新质生产力发展:以档案信息生产力为视角的探究

在线全文

学校读者我要写书评

暂无评论

办公自动化 2024年第17期29卷 7-11页

作者：宋雅三门峡市建设工程消防技术中心三门峡472000

文章从档案信息资源的角度,深入探讨档案信息生产力在新质生产力中的关键作用。文章详细阐述通过具体应用方式对档案信息资源进行优化,进一步提升档案信息生产力,由此推动新质生产力的发展。

关键词：档案信息资源档案信息生产力新质生产力优化发展视角

美国职业教育“双师型”教师评价标准的关键特征及现实启示

在线全文

学校读者我要写书评

暂无评论

现代教育管理 2024年第6期 119-128页

作者：宋雅万东升南京大学江苏第二师范学院苏州大学

深化职业教育“双师型”教师评价改革是建立高素质职业教育师资队伍的关键。美国职业教育“双师型”教师评价具有发展性与终结性评价导向相结合、基础性与差异性评价标准相补充、实践性与应用性评价内容相协调、奖励表彰与职称晋升评价... 详细信息

深化职业教育“双师型”教师评价改革是建立高素质职业教育师资队伍的关键。美国职业教育“双师型”教师评价具有发展性与终结性评价导向相结合、基础性与差异性评价标准相补充、实践性与应用性评价内容相协调、奖励表彰与职称晋升评价激励相统一的内涵特征。我国职业教育“双师型”教师评价标准的研制应秉持发展性评价理念，充分发挥教师主体作用；合理配置评价权力，构建分类型一体化标准体系；凸显评价内容的应用性特征，重视考核教师实践能力；有效运用评价结果，完善激励机制和组织支持，推动教师专业持续发展。

关键词：美国职业教育 “双师型”教师教师评价标准教师专业发展发展性评价