检索结果-南通市图书馆

High-loading, ultrafine Ni nanoparticles dispersed on porous hollow carbon nanospheres for fast (de)hydrogenation kinetics of MgH_(2)

引用

Journal of Magnesium and Alloys 2022年第12期10卷 3354-3366页

作者： shun Wang Mingxia Gao Zhihao Yao Kaicheng Xian Meihong Wu Yongfeng Liu Wenping Sun Hongge pan State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province&School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027P.R.China

Magnesium hydride(MgH2) is one of the most promising hydrogen storage materials for practical application due to its favorable reversibility, low cost and environmental benign;however, it suffers from high dehydrogenation temperature and slow sorption *** proper catalysts with high and sustainable activity is extremely desired for substantially improving the hydrogen storage properties of MgH2. In this work, a composite catalyst with high-loading of ultrafine Ni nanoparticles(NPs) uniformly dispersed on porous hollow carbon nanospheres is developed, which shows superior catalytic activity towards the de-/hydrogenation of MgH2. With an addition of 5wt% of the composite, which contains 90 wt% Ni NPs, the onset and peak dehydrogenation temperatures of MgH2are lowered to 190 and 242 ℃, respectively. 6.2 wt% H2is rapidly released within 30 min at 250 ℃. The amount of H2that the dehydrogenation product can absorb at a low temperature of 150 ℃ in only 250 s is very close to the initial dehydrogenation value. A dehydrogenation capacity of 6.4wt% remains after 50 cycles at a moderate cyclic regime, corresponding to a capacity retention of 94.1%. The Ni NPs are highly active,reacting with MgH2and forming nanosized Mg2Ni/Mg2NiH4. They act as catalysts during hydrogen sorption cycling, and maintain a high dispersibility with the help of the dispersive role of the carbon substrate, leading to sustainably catalytic activity. The present work provides new insight into designing stable and highly active catalysts for promoting the(de)hydrogenation kinetics of MgH2.

关键词： Hydrogen storage materials Nano-catalysis Magnesium hydride Porous hollow carbon nanospheres Ni nanoparticles

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Host permissiveness to baculovirus in flue nces time-dependent immune responses and fitness costs

引用

Insect Science 2021年第1期28卷 103-114页

作者： Qinjian pan Ikkei Shikano gary WFelton Tong-Xian Liu Kelli Hoover State Key Laboratory of Crop Stress Biology for Arid Areas and Key Laboratory of Integrated Pest Management on the Loess Plateau of Ministry of AgricultureNorthwest A&F UniversityYanglingShaanxiChina Department of Entomology and Center for Chemical Ecology Pennsylvania State UniversityUniversity ParkPAUSA Department of Plant and Environmental Protection Sciences University of Hawaii at ManoaHonoluluHIUSA

Insects possess specific immune responses to protect themselves from different types of *** of immune cascades can inflict significant developmental costs on the surviving *** characterize infection kinetics in a surviving host that experiences baculovirus inoculation,it is crucial to determine the timing of immune ***,we investigated time-dependent immune responses and developmental costs elicited by inoculations from each of two wild-type baculoviruses,Autographa californica multiple nucleopolyhedrovirus(AcMNPV)and Helicoverpa zea single nucleopolyhedrovirus(HzSNPV),in their common host *** *** is a semi-permissive host of AcMNPV and fully permissive to HzSNPV,we hypothesized there are differential immune responses and fitness costs associated with resisting infection by each virus *** molted 4th-instar larvae that were inoculated with a low dose(LD15)of either virus showed signify icantly higher hemolymph FAD-glucose dehydrogenase(GLD)activities compared to the corresponding control *** phenoloxidase(PO)activity,protein concentration and total hemocyte numbers were not increased,but instead were lower than in control larvae at some time points *** that survived either virus inoculation exhibited reduced pupal weight;survivors inoculated with AcMNPV grew slower than the control larvae,while survivors of HzSNPV pupated earlier than control *** results highlight the complexity of immune responses and fitness costs associated with combating different baculoviruses.

关键词： ecological immunology FAD-glucose dehydrogenase hemocytes hostpathogen interactions nucleopolyhedrovirus phenoloxidase

来源：

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

炎症衍生指标和胱抑素C对子痫前期的临床意义

引用

检验医学 2024年第6期39卷 557-561页

作者：陈海英葛雅芳潘顺杨海鸥上海交通大学医学院附属国际和平妇幼保健院检验科、上海市胚胎源性疾病重点实验室、上海市临床重点专科建设项目——“强主体”妇产科上海200030

目的探讨炎症衍生指标[衍生中性粒细胞/淋巴细胞比值(dNLR)和系统性炎症反应指数(SIRI)]和胱抑素C(Cys C)对子痫前期的预测价值。方法选取2019年1月—2022年11月上海交通大学医学院附属国际和平妇幼保健院子痫前期患者194例(观察组)和... 详细信息

目的探讨炎症衍生指标[衍生中性粒细胞/淋巴细胞比值(dNLR)和系统性炎症反应指数(SIRI)]和胱抑素C(Cys C)对子痫前期的预测价值。方法选取2019年1月—2022年11月上海交通大学医学院附属国际和平妇幼保健院子痫前期患者194例(观察组)和健康孕妇152名(对照组)。分析dNLR、SIRI、CysC与子痫前期的关系。结果观察组CysC水平和白细胞计数、中性粒细胞计数、单核细胞计数、dNLR、SIRI高于对照组(P0.05)。Cys C、dNLR分别与收缩压和舒张压呈正相关(P0.05)。结论Cys C、dNLR、SIRI是子痫前期的独立危险因素,且具有较高的敏感性和特异性,对子痫前期的预测和评估有一定价值。

关键词：衍生中性粒细胞/淋巴细胞比值系统性炎症反应指数胱抑素C 子痫前期

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

妊娠糖尿病患者miR-342-3p和miR-423-5p水平与糖脂代谢以及胰岛素抵抗的相关性研究

引用

中国优生与遗传杂志 2024年第1期32卷 92-96页

作者：张晓璟潘顺许恬怡杨海鸥中国福利会国际和平妇幼保健院检验科上海200030 中国福利会国际和平妇幼保健院产科上海200030

目的探究妊娠糖尿病患者miR-342-3p和miR-423-5p水平与糖脂代谢以及胰岛素抵抗的相关性。方法选取2020年9月至2022年9月在中国福利会国际和平妇幼保健院诊治的96例妊娠糖尿病患者作为研究组,另选取同期孕检健康孕妇96例为对照组,采用实... 详细信息

目的探究妊娠糖尿病患者miR-342-3p和miR-423-5p水平与糖脂代谢以及胰岛素抵抗的相关性。方法选取2020年9月至2022年9月在中国福利会国际和平妇幼保健院诊治的96例妊娠糖尿病患者作为研究组,另选取同期孕检健康孕妇96例为对照组,采用实时荧光定量PCR(qRT-PCR)法检测血清miR-342-3p和miR-423-5p表达;采用Pearson法分析血清miR-342-3p和miR-423-5p相关性以及二者与糖脂代谢及胰岛素抵抗相关指标的相关性;采用Logistic回归分析妊娠糖尿病的影响因素。结果研究组血清miR-342-3p、miR-423-5p、空腹血糖(FBG)、空腹胰岛素(FINS)、总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白胆固醇(LDL-C)、胰岛素抵抗指数(HOMA-IR)显著高于对照组(P<0.05),高密度脂蛋白胆固醇(HDL-C)和胰岛β细胞功能指数(HOMA-β)显著低于对照组(P<0.05)。根据Pearson相关性分析得知,血清miR-342-3p和miR-423-5p水平呈正相关(P<0.05),血清miR-342-3p和miR-423-5p水平与FBG、FINS、TC、TG、LDL-C、HOMA-IR呈正相关(P<0.05),与HDL-C和HOMA-β呈负相关(P<0.05)。根据Logistic回归分析得知FBG、FINS、TC、TG、LDL-C、miR-342-3p、miR-423-5p高表达,HDL-C降低是影响妊娠糖尿病的危险因素(P<0.05)。结论妊娠糖尿病患者miR-342-3p和miR-423-5p水平异常升高,二者与糖脂代谢和胰岛素抵抗相关。

关键词：妊娠糖尿病 miR-342-3p miR-423-5p 糖脂代谢胰岛素抵抗

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microstructure and creep properties of high Cr resisting weld metal alloyed with Co

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第10期11卷 756-760页

作者： Xue WANG Liang-fei ZHAN Qian-gang pan Zhi-jun LIU Hong LIU Yong-shun TAO School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China DongFang Boiler Group Co. Ltd. Zigong 643001 China

A 9% Cr ferritic steel weld metal containing 1% Co, partially substituted for nickel, was prepared by submerged arc welding (SAW) processing. The microstructure and creep properties of the weld metal were investigated. The microstructure exhibited a fully tempered martensitic structure free of δ-ferrite. The creep properties of the obtained weld metal were inferior to those of the P92 base metal at 600 and 650 °C. The values of A and n for weld metal in the Norton power law constitution at 650 °C are 1.1×10?21 and 8.1, respectively.

关键词： 9Cr steels Weld metal Microstructure Creep properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microstructure Evolution and Mechanical Properties of Spray-deposited Al-21.47Si-4.73Fe-2.5Cu-0.9Mg Alloy

引用

Journal of Iron and Steel Research International 2016年第1期23卷 14-18页

作者： Yan-dong JIA Fu-yang CAO pan MA Jing-shun LIU Jian-fei SUN Gang WANG Laboratory for Microstructures Institute of MaterialsShanghai University School of Materials Science and Engineering Harbin Institute of Technology School of Materials Engineering Shanghai University of Engineering Science School of Materials Science and Engineering Inner Mongolia University of Technology

Al-Si-Fe-Cu-Mg alloy was prepared by spray deposition and was further processed by hot extrusion as well as *** results indicate that the microstructure of the deposited alloy is composed of primary Si particles with average size of less than 5μm,α-Al,Al_2CuMg,β-Al_5FeSi andδ-Al_4FeSi_2（rectangular shape）,and no eutectic silicon is found due to the special solidification *** age hardening curves reveal two *** uniform ultimate tensile strength（UTS）and the elongation of the peak-aged Al-Si-Fe-Cu-Mg alloy are 468.3 MPa,0.61% at 298 Kand 267.4MPa,6.42% at 573 K,*** fracture surfaces display brittle fracture morphology at 298 K,whereas it varies to mixture of brittle and ductile failure with increasing the temperature.

关键词： spray deposition hypereutectic Al-Si alloy microstructure aging mechanical property

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Glyphosate exposure deteriorates oocyte meiotic maturation via induction of organelle dysfunctions in pigs

引用

Journal of Animal Science and Biotechnology 2022年第6期13卷 1754-1767页

作者： Chunhua Xing shun Chen Yue Wang Zhennan pan Yuanjing Zou Shaochen Sun Zili Ren Yu Zhang College of Animal Science and Technology Nanjing Agricultural UniversityNanjing 210095China

Background:Recently,defects in mammalian oocytes maturation induced by environmental pollution results in the decreasing animal *** exposed to glyphosate is largely unavoidable because glyphosate is one of the most widely used herbicide worldwide due to its high-efficiency and broad-spectrum effects,which causes glyphosate an environmental contaminant found in soil,water and *** the last few years,the growing and wider use of glyphosate has raised great concerns about its effects of reproductive *** this study,using porcine models,we investigated effects of glyphosate on organelle functions during oocyte ***:The results showed glyphosate exposure disrupted porcine oocyte *** levels of cumulus expansion-related genes were interfered,further indicating the meiotic *** damaging effects were mediated by destruction of mitochondrial distribution and functions,which induced ROS accumulation and oxidative stress,also indicated by the decreased mRNA expression of related antioxidant enzyme *** also found an interference of endoplasmic reticulum(ER)distribution,disturbance of Ca^(2+)homeostasis,as well as fluctuation of ER stress,showing with the reduced ER stress-related mRNA or protein expression,which could indicate the dysfunction of ER for protein processing and signal transduction in glyphosate-exposed ***,glyphosate exposure induced the disruption of lysosome function for autophagy,showing with the decrease of LAMP2 expression and autophagy-related genes mRNA ***,our data showed the distribution of Golgi apparatus and the functions of ribosome were disturbed after glyphosate exposure,which might affect protein synthesis and ***:Collectively,our study showed that exposed to glyphosate could affect animal reproduction by compromising the quality of oocytes through its wide toxic effects on organelle functions.

关键词： Endoplasmic reticulum Glyphosate Lysosome Mitochondria Organelles Oocyte maturation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于PLA材料的3D打印悬垂结构表面精度优化

引用

塑料科技 2024年第2期52卷 100-105页

作者：胡甜唐清春王太子潘文俊张万顺马泽星广西科技大学机械与汽车工程学院广西柳州545006 广西科技大学创新创业学院广西柳州545006

熔融沉积成型3D打印利用逐层累积的方法可以快速制造出复杂型腔的零件和模型,但此制造方式下零件容易出现表面缺陷和尺寸误差。文章针对零件在打印过程中悬垂部分底面出现的筋状拉丝问题,通过前处理添加致密层和后处理利用化学溶液抛光... 详细信息

熔融沉积成型3D打印利用逐层累积的方法可以快速制造出复杂型腔的零件和模型,但此制造方式下零件容易出现表面缺陷和尺寸误差。文章针对零件在打印过程中悬垂部分底面出现的筋状拉丝问题,通过前处理添加致密层和后处理利用化学溶液抛光的方法进行实验,测量打印零件悬垂部分圆柱度,以直接打印零件测量的圆柱度为基准。结果表明:只经过前处理的零件其圆柱度相比未做处理的零件提升了13.6%。只经过后处理的零件其圆柱度相比未做处理的零件提升了18.7%。前处理与后处理相结合而得到的零件其悬垂部分圆柱度精度提升了64.3%。研究验证了前处理与后处理结合可有效地解决悬垂部分出现的筋状拉丝情况。

关键词： 3D打印复杂型腔筋状拉丝后处理圆柱度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Annealing atmosphere-dependent capacitive energy storage

引用

Rare Metals 2023年第5期42卷 1465-1471页

作者： Bing-Bing Yang Hai-Yun Tong shun Lan Yi-Qian Liu Lv-Ye Dou Hao pan Yuan-Hua Lin State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China School of Physics and Materials Engineering Hefei Normal UniversityHefei230601China Department of Materials Science and Engineering University of CaliforniaBerkeley94720USA

Electrostatic capacitors based on dielectrics with high energy density and efficiency are desired for modern electrical systems owing to their intrinsic fast charging-discharging speed and excellent *** longstanding bottleneck is their relatively small energy ***,we report enhanced energy density and efficiency in the Aurivillius Pb_(2)Bi_(4)Ti_(5)O_(18)films by controlling the post-annealing *** results demonstrate that the fabrication atmosphere has significant effects on the film texture and *** the increase of the oxygen pressure of annealing atmosphere,the Pb_(2)Bi_(4)Ti_(5)O_(18)films show a preferred growth orientation of(00l)and fewer defects,which leads to a higher polarization and breakdown field for the film annealed in air atmosphere and thus help to achieve an ultrahigh energy density of59.4 J·cm^(-3)and an improved efficiency of 81.2%.Moreover,the film also exhibits excellent cycling reliability and good thermal *** Pb_(2)Bi_(4)Ti_(5)O_(18)films show a significant potential application for dielectric capacitors.

关键词： Aurivillius phase film Annealing atmosphere Energy density Efficiency

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

High energy storage capability of perovskite relaxor ferroelectrics via hierarchical optimization

引用

Rare Metals 2022年第3期41卷 730-744页

作者： Min-Hao Zhang Jun-Lei Qi Yi-Qian Liu shun Lan Zi-Xi Luo Hao pan Yuan-Hua Lin State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Innovation Team for New High Volumetric Efﬁcient MLCC Materials and Devices Foshan(Southern China)Institute for New MaterialsFoshan 528000China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 639798Singapore

Ultrafast charge/discharge process and ultrahigh power density enable dielectrics essential components in modern electrical and electronic devices, especially in pulse power systems. However, in recent years, the energy storage performances of present dielectrics are increasingly unable to satisfy the growing demand for miniaturization and integration, which stimulates further researches on dielectrics with higher energy density and *** various inorganic dielectrics, perovskite relaxor ferroelectrics are recognized as promising candidates for energy storage applications, with high permittivity and relatively high efficiency. Here, we focus on recent progress and achievements on optimizing perovskite relaxor ferroelectrics toward better energy storage capability through hierarchical design. The principles and key parameters of dielectric energy storage, together with the definition of majority types of dielectrics, are introduced at first. Strategies within various scales include domain, grain size, orientation, and composite engineering are summarized. The existing challenges are presented and future prospects are proposed in the end, with the background of both academic explorations and industrial applications.

关键词： Dielectric Energy storage Capacitance Perovskite Relaxor ferroelectric

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：