检索结果-南通市图书馆

Boosting Hydrogen Storage Performance of MgH_(2) by Oxygen Vacancy-Rich H-V_(2)O_(5) Nanosheet as an Excited H-Pump

Nano-Micro Letters 2024年第8期16卷 398-416页

作者： Li ren Yinghui Li Zi Li Xi Lin chong Lu Wenjiang Ding Jianxin Zou National Engineering Research Center of Light Alloys Net Forming&State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Shanghai Engineering Research Center of Mg Materials and Applications&School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Center of Hydrogen Science Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Instrumental Analysis Center of SJTU Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

MgH_(2) is a promising high-capacity solid-state hydrogen storage material,while its application is greatly hindered by the high desorption temperature and sluggish kinetics.Herein,intertwined 2D oxygen vacancy-rich V_(2)O_(5) nanosheets(H-V_(2)O_(5))are specifically designed and used as catalysts to improve the hydrogen storage properties of MgH_(2).The as-prepared MgH_(2)-H-V_(2)O_(5) composites exhibit low desorption temperatures(Tonset=185℃)with a hydrogen capacity of 6.54 wt%,fast kinetics(Ea=84.55±1.37 kJ mol^(-1) H_(2) for desorption),and long cycling stability.Impressively,hydrogen absorption can be achieved at a temperature as low as 30℃ with a capacity of 2.38 wt%within 60 min.Moreover,the composites maintain a capacity retention rate of~99%after 100 cycles at 275℃.Experimental studies and theoretical calculations demonstrate that the in-situ formed VH_(2)/V catalysts,unique 2D structure of H-V_(2)O_(5) nanosheets,and abundant oxygen vacancies positively contribute to the improved hydrogen sorption properties.Notably,the existence of oxygen vacancies plays a double role,which could not only directly accelerate the hydrogen ab/de-sorption rate of MgH_(2),but also indirectly affect the activity of the catalytic phase VH_(2)/V,thereby further boosting the hydrogen storage performance of MgH_(2).This work highlights an oxygen vacancy excited“hydrogen pump”effect of VH_(2)/V on the hydrogen sorption of Mg/MgH_(2).The strategy developed here may pave a new way toward the development of oxygen vacancy-rich transition metal oxides catalyzed hydride systems.

关键词： Hydrogen storage MgH_(2) V_(2)O_(5)nanosheets Oxygen vacancies VH_(2)

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

Observing eddy dye patches induced by shear instabilities in the surf zone on a plane beach

引用

Acta Oceanologica Sinica 2024年第3期43卷 15-29页

作者： Chunping ren Nannan Fu chong Yu Yuchuan Bai Kezhao Fang State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China College of Water Resource Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

The effects of surf zone eddy generated by alongshore currents on the deformation and transport of dye are still poorly understood,and related tracer release experiments are lacking.Therefore,a tracer release laboratory experiment was conducted under monochromatic,unidirectional incident waves with a large incident angle(30°)on a plane beach with a 1:100 slope in a large wave basin.A charge-coupled device suspended above the basin recorded the dye patch image.The evolution of eddy dye patch was observed and the transport and diffusion were analyzed based on the collected images.Subsequently,a linear instability numerical model was adopted to calculate the perturbation velocity field at the initial stage.The observation and image processing results show that surf zone eddy patches occurred and were separated from the original dye patches.Our numerical analysis results demonstrate that the structure of the perturbation velocity field is consistent with the experimental observations,and that the ejection of eddy patches shoreward or offshore may be ascribed to the double vortex.

关键词： surf zone tracer release experiment evolution of eddy patch shear instability of alongshore currents

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

Prevention and treatment of gerbil hepatitis E using the programmable CRISPR-Cas13d system

引用

Genes & Diseases 2024年第4期11卷 94-97页

作者： Chengcheng Zhao chong Lia Sa Li Hanyu Wu Pengyao ren Tianlong Liu Xiaoxiang Hu Ran Zhang State Key Laboratory of Animal Biotech Breeding College of Biological SciencesChina Agricultural UniversityBeijing 100193China Laboratory of Veterinary Pathology and Nanopathology College of Veterinary MedicineChina Agricultural UniversityBeijing 100193China

In recent years,the global incidence of hepatitis E virus(HEV)has been rising,leading to increased morbidity and mortality associated with hepatitis.Cas13,a CRISPR effector,shows promise as an antiviral agent against singlestranded RNA viruses.Cas13d,a type VI-D effector,exhibits higher efficiency in suppressing RNA viruses compared to other type VI variants.However,its in vivo activity against RNA viruses in mammals remains unknown.

关键词： mortality hepatitis treatment

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

Inhibition of proliferation,migration,and invasiveness of bladder cancer cells through SAPCD2 knockdown

引用

BIOCELL 2024年第1期48卷 97-109页

作者： chong SHEN JIAJUN YAN YU ren ZHIRONG ZHU XIAOLONG ZHANG SHUIXIANG TAO Department of Urology Shaoxing People’s HospitalShaoxing HospitalZhejiang University School of MedicineShaoxingChina

Introduction:Bladder cancer(BC)has a high incidence and mortality rate worldwide.Suppressor anaphasepromoting complex domain containing 2(SAPCDC2)is over-expressed in a variety of tumors.Objectives:This study investigated the effects of SAPCD2 knockdown on BC cells.Methods:T24 and UMUC3 cell models and the xenografted BC tumor model with SAPCD2 knockdown were established to observe the malignant phenotype of BC cells by cell counting kit-8 assay,colony formation test,wound healing,and Transwell assay,mRNA and proteins expressions were measured with quantitative real-time polymerase chain reaction,western blotting,and tissue immunohistochemistry.Lithium chloride agonist on the Wnt/β-catenin pathway was used to clarify the molecular mechanism of SAPCD2 knockdown.Results:SAPCD2 expression was significantly higher in BC cell lines than in SVHUC-1 cells.SAPCD2 knockdown inhibited viability and cloning,hindered the G0/G1 phase of the cell cycle in UMUC3 and T24 cells,and decreased the migration and invasiveness of BC cells.SAPCD2 knockdown inhibited expression levels of cyclin D1,cyclin B1,N-cadherin,vimentin,Snail,β-catenin,c-Myc,and cyclin-dependent kinase 4,while the P21 and E-cadherin were raised by SAPCD2 knockdown.Furthermore,lithium chloride reversed the effects of SAPCD2 knockdown on the expression levels of the above proteins in UMUC3 and T24 cells.In vivo,SAPCD2 knockdown inhibited the volume,weight,and expression of Ki-67 andβ-catenin in tumors and increased the E-cadherin expression.Conclusion:SAPCD2 knockdown inhibits the malignant phenotype of BC via a pathway involvingβ-catenin.

关键词： Bladder cancer SAPCD2 β-catenin c-Myc CDK4 Lithium chloride

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

Exciting lattice oxygen of nickel–iron bi-metal alkoxide for efficient electrochemical oxygen evolution reaction

引用

Journal of Energy Chemistry 2024年第1期88卷 194-201,I0005页

作者： Saihang Zhang Senchuan Huang Fengzhan Sun Yinghui Li Li ren Hao Xu Zhao Li Yifei Liu Wei Li Lina chong Jianxin Zou National Engineering Research Center of Light Alloy Net Forming&State Key Laboratory of Metal Matrix Composites Center of Hydrogen ScienceSchool of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Chemistry Laboratory of Advanced MaterialsShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsiChEM and State Key Laboratory of Molecular Engineering of PolymersCollege of Chemistry and MaterialsFudan UniversityShanghai 200433China

High efficiency,cost-effective and durable electrocatalysts are of pivotal importance in energy conversion and storage systems.The electro-oxidation of water to oxygen plays a crucial role in such energy conversion technologies.Herein,we report a robust method for the synthesis of a bimetallic alkoxide for efficient oxygen evolution reaction(OER)for alkaline electrolysis,which yields current density of 10 mA cm^(-2)at an overpotential of 215 mV in 0.1 M KOH electrolyte.The catalyst demonstrates an excellent durability for more than 540 h operation with negligible degradation in activity.Raman spectra revealed that the catalyst underwent structure reconstruction during OER,evolving into oxyhydroxide,which was the active site proceeding OER in alkaline electrolyte.In-situ synchrotron X-ray absorption experiment combined with density functional theory calculation suggests a lattice oxygen involved electrocatalytic reaction mechanism for the in-situ generated nickel–iron bimetal-oxyhydroxide catalyst.This mechanism together with the synergy between nickel and iron are responsible for the enhanced catalytic activity and durability.These findings provide promising strategies for the rational design of nonnoble metal OER catalysts.

关键词： Oxygen evolution reaction Nickel-iron bi-metal alkoxide Lattice oxygen-mediated reaction mechanism Alkaline electrolysis Electrocatalysts

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

A Novel Adaptive In SAR Phase Filtering Method Based on Complexity Factors

引用

Chinese Journal of Electronics 2023年第5期32卷 1089-1105页

作者： XU Huaping WANG Yuan LI Chunsheng ZENG Guobing LI Shuo LI Shuang ren chong School of Electronic and Information Engineering Beihang University Nanjing Research Institute of Electronics Technology Beijing Institute of Radio Measurement China Academy of Launch Vehicle Technology

Phase filtering is an essential step in interferometric synthetic aperture radar(In SAR) imaging.For interferograms of complicated and changeable terrain,the increasing resolution of In SAR images makes it even more difficult. In this paper, a novel adaptive In SAR phase filtering method based on complexity factors is proposed. Firstly, three complexity factors based on the noise distribution and terrain slope information of the interferogram are selected. The complexity indicator composed of three complexity factors is used to guide the adaptive selection of the most suitable and effective filtering strategies for different areas. Then, the complexity scalar is calculated, which can guide the adaptive local fringe frequency estimation and adaptive parameters calculation in different filter methods. Finally, validations are performed on the simulated and real data. The performance comparison between the other three representative phase filtering method and the proposed method have validated the effectiveness and superiority of the proposed method.

关键词： Interferometric synthetic aperture radar Adaptive Phase filtering Complexity Factors Local fringe frequency (LFF)

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

维奈克拉联合治疗急性髓系白血病的疗效和预后因素分析

引用

中国实验血液学杂志 2024年第1期32卷 104-111页

作者：任崇崇张婉婉吴庭恺刘蓓兰州大学第一临床医学院甘肃兰州730000 兰州大学第一医院血液内科甘肃兰州730000

目的:探讨维奈克拉(venetoclax,VEN)联合治疗急性髓系白血病(AML)的疗效和预后因素。方法:回顾性分析2020年3月至2023年4月在兰州大学第一医院接受VEN联合治疗的AML患者的临床资料,观察疗效及生存情况,分析其影响因素并评估安全性。结果... 详细信息

目的:探讨维奈克拉(venetoclax,VEN)联合治疗急性髓系白血病(AML)的疗效和预后因素。方法:回顾性分析2020年3月至2023年4月在兰州大学第一医院接受VEN联合治疗的AML患者的临床资料,观察疗效及生存情况,分析其影响因素并评估安全性。结果:本研究共纳入74例AML患者,其中初治AML 43例,复发难治性AML(R/R AML)31例。43例初治AML患者的中位年龄为65岁,复合完全缓解(cCR)率为67.4%(29/43),客观缓解率(ORR)为72.1%(31/43),中位总生存期(OS)为17.3个月。31例R/R AML患者中位年龄为51岁,cCR率为38.7%(12/31),ORR为58.1%(18/31),中位OS为7.1个月。性别、VEN治疗前血细胞计数、基因突变和预后分层与能否获得cCR有关。未获得cCR是患者死亡的独立危险因素。结论:VEN联合治疗AML安全有效,其疗效和生存受分子生物学、细胞遗传学等因素影响。

关键词：维奈克拉急性髓系白血病疗效生存

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

掺杂Li^(+)的NaGdF_(4)∶Yb^(3+)/Eu^(3+)上转换发光增强及防伪应用

引用

光谱学与光谱分析 2024年第2期44卷 497-503页

作者：王翀任仲翾李冬冬佘江波西安邮电大学电子工程学院陕西西安710121 中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室陕西西安710119

稀土发光材料由于其良好的上转换发光性能已经逐渐成为荧光防伪领域的研究热点。首先采用水热法合成了一系列不同Li^(+)掺杂浓度的NaGdF_(4)∶Yb^(3+)/Eu^(3+)晶体,利用X射线衍射(XRD)、扫描电子显微镜(SEM)、上转换发射光谱测试等表征... 详细信息

稀土发光材料由于其良好的上转换发光性能已经逐渐成为荧光防伪领域的研究热点。首先采用水热法合成了一系列不同Li^(+)掺杂浓度的NaGdF_(4)∶Yb^(3+)/Eu^(3+)晶体,利用X射线衍射(XRD)、扫描电子显微镜(SEM)、上转换发射光谱测试等表征方法,对样品的形貌、尺寸和上转换发光性能进行了分析,并选择发光强度和效果最好的晶体应用于防伪识别。实验结果表明,NaGdF_(4)∶Yb^(3+)/Eu^(3+)/Li^(+)的XRD衍射图谱与标准六方相NaGdF4的衍射峰一致,衍射峰尖锐且没有杂峰,证明合成了高纯度高结晶度的NaGdF4∶Yb^(3+)/Eu^(3+)/Li^(+)晶体。晶体的SEM图可以看出生成的样品为纯六方相,分布均匀,无团聚现象。共掺Yb^(3+)/Eu^(3+)/Li^(+)对晶体的结构、形貌、尺寸几乎没有影响。从上转换发射光谱可以看出,15 mol%Li^(+)掺杂的NaGdF4∶Yb^(3+)/Eu^(3+)晶体绿色发光强度是未掺杂Li^(+)的样品的6倍。考察了980 nm激光器的功率变化对未掺杂Li^(+)以及掺杂15 mol%Li^(+)样品的上转换发光性能的影响,发现随着激发功率从0.8 W增加到2.2 W的过程中,上转换发光强度逐渐增强。拟合后得到样品上转换过程中的所需光子数n值接近于2,为双光子发光过程。对NaGdF4∶Yb/Eu/Li进行了荧光寿命测试,5D_(1)能级的荧光寿命是未掺杂的1.4倍。最后,将形貌均匀、发光强度强的NaGdF_(4)∶0.2Yb/0.02Eu/0.15Li制成防伪油墨,通过丝网印刷技术在纸张、玻璃、塑料等材料上印刷荧光防伪图案。在980 nm激光的泵浦下,防伪图案发出明亮的绿光。在自然环境下,纸张上的防伪图案有很好的隐蔽性。图案中的“safe”字样长度为5.5 mm,字母间距为0.5 mm,在980 nm激光的泵浦下,仍然可以分辨清楚。将印制有防伪图案的塑料暴露在室外自然环境下一个月,图案没有明显改变。表明NaGdF_(4)∶0.2Yb/0.02Eu/0.15Li制成的防伪图案分辨率高,易于识别,受环境影响小,在防伪识别方面具有良好的应用前景。

关键词：上转换发光稀土掺杂荧光光谱防伪识别丝网印刷

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

电子商务专业1+X证书课程体系构建的探索

引用

湖北开放职业学院学报 2024年第12期37卷 174-176页

作者：任翀广西开放大学广西南宁530022

电子商务行业的迅猛发展对电子商务专业人才的需求日益增加。为了提高学生的就业竞争力,许多高等院校开始探索建立电子商务专业1+X证书课程体系。本文通过市场需求分析、课程设置和培养目标的讨论,提出课程体系构建策略,以确保课程体系... 详细信息

电子商务行业的迅猛发展对电子商务专业人才的需求日益增加。为了提高学生的就业竞争力,许多高等院校开始探索建立电子商务专业1+X证书课程体系。本文通过市场需求分析、课程设置和培养目标的讨论,提出课程体系构建策略,以确保课程体系与行业需求的紧密对接,这种课程体系构建方法有助于提高学生的就业竞争力,并满足电子商务行业的多样化需求。

关键词：电子商务专业 1+X证书课程体系

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

骨髓增生异常综合征患者基因突变与临床特征相关性及预后

引用

中国实验血液学杂志 2024年第1期32卷 176-183页

作者：张婉婉张雅丽任崇崇吴庭恺刘蓓甘肃省兰州大学第一临床医学院兰州大学第一医院血液内科甘肃兰州730000

目的:探索骨髓增生异常综合征(MDS)基因突变与临床特征的相关性及预后分析。方法:收集兰州大学第一医院2015年6月至2023年2月期间131例MDS患者的临床资料,随访期间其中19例进展为继发性急性髓系白血病(sAML)。利用二代测序技术检测MDS... 详细信息

目的:探索骨髓增生异常综合征(MDS)基因突变与临床特征的相关性及预后分析。方法:收集兰州大学第一医院2015年6月至2023年2月期间131例MDS患者的临床资料,随访期间其中19例进展为继发性急性髓系白血病(sAML)。利用二代测序技术检测MDS疾病相关基因突变类型并绘制突变谱,结合患者临床资料分析其之间相关性及预后。结果:131例MDS患者中位年龄58(17-86)岁,男女比例约为1.3∶1。131例中共检测出148个基因突变、25种突变类型,其中U2AF1、ASXL1常与其它基因发生共突变,且分别与20q-和正常核型伴随出现。SETBP1和SRSF2多见于60岁以上患者,NPM1和WT1常见于60岁以下患者,老年患者的基因突变数目多于年轻患者。男性SF3B1和RUNX1基因突变发生率高于女性,女性DNMT3A基因突变发生率高于男性。MDS进展为sAML患者组的基因突变数目高于MDS组(1.8 vs 1.0个,P=0.006)。单因素、多因素分析结果显示,IPSS-R预后评分≥3.5分和TP53是MDS患者预后不良的危险因素。单等位基因TP53突变和野生型TP53患者OS优于双等位基因突变型(P=0.003);未转白患者OS优于sAML患者(P=0.01);移植患者OS明显优于未移植患者(P=0.036)。结论:基因突变与细胞遗传学指标和临床特征(外周血细胞数、性别、年龄)密切相关。IPSS-R预后评分、TP53是影响MDS患者OS的危险因素。

关键词：骨髓增生异常综合征共突变细胞遗传学临床表型预后

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：