检索结果-南通市图书馆

Heterostructured Co_(3)O_(4)-SnO_(2)composites containing oxygen vacancy with high activity and recyclability toward NH_(3)BH_(3)dehydrogenation

引用

Rare Metals 2023年第9期42卷 3013-3023页

作者： hui-ze wang You-Xiang Shao Yu-Fa Feng Yu-Jie Tan Qing-Yu Liao Xiao-Dong Chen Xue-Feng Zhang Zhao-hui Guo Hao Li School of Chemistry and Materials Engineering Huizhou UniversityHuizhou516007China Guangdong Provincial Key Laboratory for Electronic Functional Materials and Devices Huizhou UniversityHuizhou516007China

Ammonia borane(NH_(3)BH_(3),AB)has been regarded as a promising chemical hydrogen storage material owing to its high hydrogen density and superior ***,the development of low-cost and high-efficient heterogeneous catalysts for the dehydrogenation of AB has attracted considerable scholarly *** this study,heterostructured Co_(3)O_(4)-SnO_(2)catalysts containing oxygen vacancy(V_(o))with different Co/Sn atomic ratios(designated as V_(o)-Co-Sn_(5:x))were synthesized via a simple coprecipitation-calcination method under mild reaction *** catalyst containing an optimized Co/Sn atomic ratio of 5:2(V_(o)-Co-Sn_(5:2))exhibited robust catalytic performance with a turnover frequency value of 17.6mol_(H2)·mol^(-1)_(metal)·min^(-1).Moreover,82.6%of the original activity of the catalyst was retained after 14 catalytic cycles,indicating the high stability of the *** characterization combined with the density functional theory(DFT)calculation confirmed the transfer of electrons from Co_(3)O_(4)to Sn O_(2)and the distribution of the separated charges on SnO_(2)-Co_(3)O_(4)*** transfer of electrons and the distribution of charges facilitated the adsorption and activation of water on the catalyst,thus accelerating the dissociation of H_(2)O molecule(the ratedetermining step of AB hydrolysis).It was found that the V_(o)adjusted the electron structure of the catalysts rather than acted as active *** findings will provide researchers with useful information for designing cheap and highly efficient catalysts for catalytic AB hydrolysis.

关键词： Ammonia borane(AB) Cobalt-tin composite oxide Heterocatalysis Hydrogen production Oxygen vacancy

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

All-fiber linearly polarized laser oscillator by fiber coiling loss control

引用

Chinese Physics B 2018年第4期27卷 305-308页

作者： Yu-Sheng Huang Qi-Rong Xiao Dan Li ze-hui wang Xue-Jiao wang Ping Yan Ma-Li Gong Center for Photonics and Electronics Department of Precision Instrument Tsinghua University Beijing 100084 China

In this paper,we demonstrate an all-fiber linearly polarized fiber laser *** single polarization of the oscillator is achieved through the careful designing of the active fiber *** relationship between fiber coiling diameter and polarization extinction ratio and optical efficiency is studied,whose results lead to an optimized *** thermal management of the oscillator is also refined,which allows the oscillator to reach a maximum output power of44.1 W with an optical-to-optical efficiency of 57.9%.A high average polarization extinction ratio of 21.6 d B is achieved during a 2-hour stability *** oscillator also owns a narrow 3-d B bandwidth of 0.1 nm,as well as near-diffraction-limit beam quality of M^2～ 1.14.

关键词： fiber laser oscillator linearly polarized all-fiber

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

Identification of CD146 Expression in Human and Mouse Preimplantation Embryo

引用

Journal of Reproduction and Contraception 2008年第1期19卷 17-26页

作者： Hong-bo wang Xuan DU Ya-hui XU ze-hua wang Department of Obstetrics and Gynecology Union Hospital of Tongji Medical College Huazhong University Science and Technology Wuhan 430022 China

Objective To investigate whether CD146, a cell adhesion molecule mouse and human preimplantation blastocysts and to localize CD146 trophectoderm（TE） and/or inner cell mass（ICM）. is expressed in in the layer of Methods Human and mouse embryos were collected. Using reverse transcriptionpolymerase chain reaction（RT-PCR）, the expression of CD146 mRNA in blastocyst was evaluated in human and mouse embryos. Single embryo immunohistochemical staining was applicated in the examination of the expression of CD146 in protein level. The statistical significance of the data was analyzed using t-test. Results CD146 transcript was detected in all human and mouse preimplantation morula and blastocyst. The expression of CD146 was found to localize in human and mouse compacted morula stage embryos and the TE and ICM of the expanded blastocysts. Conclusion mRNA and protein of CD1 46 was expressed in preimplantation embryos, which may have a profound influence on early preimplantation development for the differentiation of the trophectoderm and the morphogenesis of the blastocyst. Furthermore, the expression of CD146 in blastocyst stage may be implicated in the assistance of embryo implantation.

关键词： CD146 blastocyst preimplantation

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

Internal Features of Fiber Fuse in a Yb-Doped Double-Clad Fiber at 3 kW

引用

Chinese Physics Letters 2018年第5期35卷 29-33页

作者： Qi-Rong Xiao Jia-Ding Tian Yu-Sheng Huang Xue-Jiao wang ze-hui wang Dan Li Ping Yan Ma-Li Gong Center for Photonics and Electronics Department of Precision Instrument Tsinghua University

We study internal features of fiber fuse in a Yb-doped double-clad fiber. The samples of fiber fuse are acquired at the power level of 3 kW in an all-fiber forward-pumped master oscillator power amplifier configuration fiber laser that is built specially for fiber fuse analyses. At this high power level, drastic refractive-index redistribution arises in an expended high refractive index area around the bullet-shaped voids of fiber fuse. Electron spin resonance analyses on post-fiber-fuse samples of the Yb-doped double-clad fiber indicate rising Frenkel defect concentration, meanwhile showing a new resonance center that is different from the ones of the Ge-doped fibers studied previously. This new resonance center probably suggests the generation of Al-oxygen hole center, a kind of defect formed during the catastrophic fuse process.

关键词： Fiber lasers

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

Difference between type 2 gastroesophageal varices and isolated fundic varices in clinical profiles and portosystemic collaterals

引用

World Journal of Clinical Cases 2022年第17期10卷 5620-5633页

作者： Yu-Hu Song Hong-Yu Xiang Ke-Ke Si ze-hui wang Yu Zhang Chang Liu Ke-Shu Xu Xin Li Department of Gastroenterology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022Hubei ProvinceChina Department of Radiology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022Hubei ProvinceChina Hubei Province Key Laboratory of Molecular Imaging Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022Hubei ProvinceChina

BACKGROUND There is significant heterogeneity between gastroesophageal varices(GOV2)and isolated gastric varices(IGV1).The data on the difference between GOV2 and IGV1 are *** To determine the etiology,clinical profiles,endoscopic findings,imaging signs,portosystemic collaterals in patients with GOV2 and *** Medical records of 252 patients with gastric fundal varices were retrospectively collected,and computed tomography images were *** Significant differences in routine blood examination,Child-Pugh classification and MELD scores were found between GOV2 and *** incidence of peptic ulcers in patients with IGV1(26.55%)was higher than that of GOV2(11.01%),while portal hypertensive gastropathy was more commonly found in patients with GOV2(22.02%)than in those with IGV1(3.54%).Typical radiological signs of cirrhotic liver were more commonly observed in patients with GOV2 than in those with *** patients with GOV2,the main afferent vessels were via the left gastric vein(LGV)(97.94%)and short gastric vein(SGV)(39.18%).In patients with IGV1,the main afferent vessels were via the LGV(75.61%),SGV(63.41%)and posterior gastric vein(PGV)(43.90%).In IGV1 patients with pancreatic diseases,spleno-gastromental-superior mesenteric shunt(48.15%)was a major collateral *** patients with fundic varices,the sizes of gastric/esophageal varices were positively correlated with afferent vessels(LGVs and PGVs)and efferent vessels(gastrorenal shunts).The size of the esophageal varices was negatively correlated with gastrorenal shunts in GOV2 *** Significant heterogeneity in the etiology and vascular changes between GOV2 and IGV1 is useful in making therapeutic decisions.

关键词： Gastrorenal shunt Spleno-gastroomental-superior mesenteric shunt Liver cirrhosis Pancreatic diseases

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

Rational modulation of fluorophosphate cathode by anionic groups to reduce the polarization behavior for fast-charging sodium-ion batteries

引用

Journal of Energy Chemistry 2025年第1期100卷 509-521页

作者： Xinyuan wang Fan Zhang Xingyu Zhou Qian wang Changyu Liu Yangyang Liu hui wang Xiaojie Liu Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science Northwest University

Na3V2（PO4）2O2F （VP） is recognized as a promising cathode material for sodium-ion batteries due to its stable structural framework and high specific *** functional theory （DFT） and finite element simulations show that incorporating SO42-into VP decreases its band gap,lowers the migration energy barrier,and ensures a uniform Na+concentration gradient and stress distribution during charge and discharge ***,the average Na+diffusion coefficient of Na3V2（PO4）1.95（SO4）0.05O2F（VPS-1） is roughly double that of VP,leading to enhanced rate capability (80 C,75.5 mAh g-1) and cycling stability (111.0 mAh g-1capacity after 1000 cycles at 10 C current density) for ***-1 exhibits outstanding fast-charging capabilities,achieving an 80%state of charge in just 8.1 *** assembled VPS-1//SbSn/NPC full cell demonstrated stable cycling over 200 cycles at a high 5 C current,maintaining an average coulombic efficiency of 95.35%.

关键词： Anionic group modulation Polarization behavior Fast-charging Sodium-ion battery Fluorophosphate Cathode

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

Unraveling the significance of cobalt on transformation kinetics,crystallography and impact toughness in high-strength steels

引用

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 380-390页

作者： Yishuang Yu Jingxiao Zhao Xuelin wang hui Guo Zhenjia Xie Chengjia Shang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This work reveals the significant effects of cobalt(Co)on the microstructure and impact toughness of as-quenched highstrength steels by experimental characterizations and thermo-kinetic *** results show that the Co-bearing steel exhibits finer blocks and a lower ductile-brittle transition temperature than the steel without ***,the Co-bearing steel reveals higher transformation rates at the intermediate stage with bainite volume fraction ranging from around 0.1 to *** improved impact toughness of the Co-bearing steel results from the higher dense block boundaries dominated by the V1/V2 variant ***,the addition of Co induces a larger transformation driving force and a lower bainite start temperature(BS),thereby contributing to the refinement of blocks and the increase of the V1/V2 variant *** findings would be instructive for the composition,microstructure design,and property optimization of high-strength steels.

关键词： high-strength steel cobalt transformation kinetics crystallography impact toughness

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

Stable expression of amloid protein precursor gene in SH-EP1 cells transfected with nicotinic acetylcholine receptor α4β2 subtype gene

Stable expression of amloid protein precursor gene in SH-EP1...

引用

第十二届全国神经精神药理学学术交流会

作者： Nie hui - Zhen wang ze - Jian Yin Ming Neuropharmacology laboratory, School of Pharmacy, Shanghai Jiao Tong University, Shanghai 200240

Alzheimer’s disease (AD) is one of the most common neurodegenerative diseases that affects the elderly. Neuropatho-logically, AD brains are characterized by the accumulation of extracellular amyloid plaques, mainly formed by a small pep-tide called amyloid - β ( Aβ). Nicotinic acetylcholine receptor ( nAChR) is the classical receptor of a family of ligand -gated cation channels. Among various nAChRs subtypes confirmed, α4β2 subtype is the most affluent in central nervous system. Many researches indicated that nAChRs played roles in development of AD by influencing processing of amloid pro-

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Modulation of 5-HT2C receptor on transcription of neprilysin gene and secretion of neprilysin in human glioma cell line

Modulation of 5-HT2C receptor on transcription of neprilysin...

引用

第十二届全国神经精神药理学学术交流会

作者： Yu Ling - hui wang ze - Jian Yin Ming Neuropharmacology Laboratory, School of Pharmacy, Shanghai Jiao Tong University, Shanghai 200240

Neprilysin ( NEP) , a member of zinc metallopeptidase family, has recently been focused in pharmacological research. Besides cleaving peptide signaling molecules in cardiovascular, inflammatory and immune system such as atrial natriuretic peptide, bradykinin, tachykinin, substance P and enkephalin, it has been proved to be a principal enzyme capable of degrading extracellular Aβin the brain. Since the results of cell and animal experiments suggested that stimulation of serotonin

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

CaH2-promoted activity of Ni-carbonate interface for CO2 methanation

引用

Journal of Energy Chemistry 2025年第1期100卷 522-532页

作者： Jin-Peng wang Guo-Cui Mao hui-Lin Jiang Bao-Xia Dong Yun-Lei Teng School of Chemistry and Chemical Engineering Yangzhou University

Transition metal-carbonate interfaces often act as active sites in heterogeneous catalytic *** interface between transition metal and metal carbonate exhibits a dynamic equilibrium during the CO2hydrogenation reaction,involving surface carbonate hydrogenation and ***,there have been few reports on engineering the activity of the interface between transition metal and alkaline earth metal carbonate for catalytic *** work demonstrated that the incorporation of CaH2in Ni/CaCO3enhances the CO2methanation activity of the *** CO2conversion for Ni/CaH2-CaCO3reached 68.5%at 400°C,which was much higher than that of the Ni/CaCO3（31.6%） and Ni/CaH2-CaO （42.4%） ***,the Ni/CaH2-CaCO3catalysts remained stable during the stability test for 24 h at 400°C and 8 *** research revealed that CaH2played a crucial role in promoting the activity of the Ni-carbonate interface for ***2could modify the electronic structure of Ni and tune the structural properties of CaCO3to generate medium basic sites （OH groups）,which are favorable for the activation of H2and ***-situ Fourier transform infrared spectroscopy （FTIR） analysis combined with density functional theory calculations demonstrated that CO2activation occurs at the hydroxyl group （OH） on the CaH2-modified Ni-carbonate surface,leading to the formation of CO3H****,our study has confirmed that CO2methanation over the Ni/CaH2-CaCO3catalysts proceeds via the formate pathway.

关键词： Metal hydride Ni catalysts Carbonate Metal-carbonate interface

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

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：