检索结果-南通市图书馆

Effects of chromium on the corrosion and electrochemical behaviors of ultra high strength steels

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2010年第3期17卷 282-289页

作者： Jin-yan Zhong Min Sun da-bo liu Xiao-gang Li Tian-qi liu School of Chemistry and Environmental Engineering China University of Mining and Technology （Beijing） Beijing 100083 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Institute of Aeronautical Materials Beijing 100095 China

The effects of chromium on the corrosion and the electrochemical behaviors of ultra high strength steels were studied by the salt spray test and electrochemical methods. The results show that ultra high strength steels remain martensite structures and have anodic dissolution characteristic with an increase of chromium content. There is no typical passive region on the polarization curves of an ultra high strength stainless steel, AerMet 100 steel, and 300M steel. However, chromium improves the corrosion resistance of the stainless steel remarkably. It has the slowest corrosion rate in the salt spray test, one order of magnitude less than that of AerMet 100 and 300M steels. With the increase of chromium content, the polarization resistance becomes larger, the corrosion potential shifts towards the positive direction with a value of 545 mV, and the corrosion current density decreases in electrochemical measures in 3.5wt% NaCl solutions. Because of the higher content of chromium, the ultra high strength stainless steel has a better corrosion resistance than AerMet 100 and 300M steels.

关键词： ultra high strength steel corrosion rate chromium electrochemical behavior

Magnetic Properties of Co 2D Antidot Arrays with Hexagonal Holes Using Colloidal Crystal Template Method

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2016年第5期29卷 409-413页

作者： Hong-Fei Qi da-bo liu Song-Yan dai Tian-Min Wang Department of Steel and Rare-Noble Metals Beijing Institute of Aeronautical Materials Center of Condensed Matter and Material Physics Beihang University

In this work, Co 2D antidot arrays with well-ordered hexagonal holes ranging in size from 1.3 to 6.2 μm were fabricated by colloidal crystal template method. The geometry configuration and magnetic properties of the samples were investigated. An enormous increase in coercivity and squareness, as compared with the corresponding continuous film, was observed. Magnetic properties of Co 2D antidot arrays showed a close dependence on pore diameter. According to geometric calculation, the effect of the pore diameter on magnetic properties was also discussed. The Co 2D antidot arrays obtained by this method are promising candidates for high-density information storage.

关键词： Co antidot arrays Colloidal crystal template Hexagonal holes Magnetic properties

Direct deposition of graphene nanowalls on ceramic powders for the fabrication of a ceramic matrix composite

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第6期28卷 27-31页

作者： Hai-Tao Zhou da-bo liu Fei Luo Ye Tian Dong-Sheng Chen Bing-Wei Luo Zhang Zhou Cheng-Min Shen Beijing Institute of Aeronautical Materials Aero Engine Corporation of ChinaBeijing 100095China Beijing National Laboratory of Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Uniform mixing of ceramic powder and graphene is of great importance for producing ceramic matrix composite. In this study, graphene nanowalls(GNWs) are directly deposited on the surface of Al2 O3 and Si3 N4 powders using chemical vapor deposition system to realize the uniform mixing. The morphology and the initial stage of the growth process are investigated. It is found that the graphitic base layer is initially formed parallel to the powder surface and is followed by the growth of graphene nanowalls perpendicular to the surface. Moreover, the lateral length of the graphene sheet could be well controlled by tuning the growth temperature. GNWs/Al2 O3 powder is consolidated by using sparking plasma sintering method and several physical properties are measured. Owing to the addition of GNWs, the electrical conductivity of the bulk alumina is significantly increased.

关键词： graphene ceramic matrix composite chemical vapor deposition

Stereotactic conformal radiotherapy of hepatic metastases:clinical analysis of 8 cases

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 1999年第4期5卷 81-83页

作者： ZHAO Wei Sheng, ZHI da Shi, liu bo Ping, JIANG Wei, CONG Zheng and DONG Cheng

ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓａｌｗａｙｓａｒｏｕｔｉｎｅｔｏｒｅｓｅｃｔｌｅｓｉｏｎｓｏｆｔｈｅｂｏｄｙｂｙｓｕｒｇｅｒｙ．Ｓｃｉｅｎｔｉｓｔｓｈａｖｅｔｒｉｅｄｔｏｏｂｔａｉｎｔｈｅｓａｍｅｒｅｓｕｌｔｓｗｉｔ... 详细信息

ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓａｌｗａｙｓａｒｏｕｔｉｎｅｔｏｒｅｓｅｃｔｌｅｓｉｏｎｓｏｆｔｈｅｂｏｄｙｂｙｓｕｒｇｅｒｙ．Ｓｃｉｅｎｔｉｓｔｓｈａｖｅｔｒｉｅｄｔｏｏｂｔａｉｎｔｈｅｓａｍｅｒｅｓｕｌｔｓｗｉｔｈｏｕｔｓｕｒｇｅｒｙ，ｂｕｔｆａ...

关键词： liver neoplasms/radiotherapy liver neoplasms/secondary stereotactic conformal radiotherapy

Characteristics of Electroencephalogram Arousals of Sleep- disordered Breathing Children at Different Sleep Stages

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 Medical Journal 2016年第23期129卷 2876-2878页

作者： da-bo liu Yu-Jing Yao Zhen-Yun Huano Jian-Wen Zhong Jia-Jian Xu Shu-Yao Qiu Shao-Feng liu Xin-Hua Yi Department of Otolaryngology Guangzhou Women and Children's Medical Center The Affiliated Guangzhou Women and Children's Medical Center of Guangzhou Medical University Guangzhou Guangdong 510120 China

Sleep-disordered breathing （SDB） is the most common sleep- related disorder, and it can seriously affect sleep conditions, growth, and neurocognitive function. Recent research even demonstrates that hypertensive pat... 详细信息

关键词： Electroencephalogram Arousals Limb Arousal Index Primary Snoring Respiratory Arousal Index Sleep-disordered Breathing Spontaneous Arousal Index

Solution‑Processed Thin Film Transparent Photovoltaics:Present Challenges and Future Development

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 566-600页

作者： Tianle liu Munerah M.S.Almutairi Jie Ma Aisling Stewart Zhaohui Xing Mengxia liu bo Hou Yuljae Cho UM-SJTU Joint Institute Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China School of Physics and Astronomy Cardiff UniversityCardiff CF243AAWalesUK Department of Electrical and Computer Engineering Yale UniversityNew HavenCT 06511USA Energy Sciences Institute Yale UniversityWest HavenCT 06516USA Future Photovoltaics Research Center Global Institute of Future TechnologyShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Electrical energy is essential for modern society to sustain economic *** soaring demand for the electrical energy,together with an awareness of the environmental impact of fossil fuels,has been driving a shift towards the utilization of solar ***,traditional solar energy solutions often require extensive spaces for a panel installation,limiting their practicality in a dense urban *** overcome the spatial constraint,researchers have developed transparent photovoltaics(TPV),enabling windows and facades in vehicles and buildings to generate electric *** TPV advancements are focused on improving both transparency and power output to rival commercially available silicon solar *** this review,we first briefly introduce wavelength-and non-wavelengthselective strategies to achieve *** of merit and theoretical limits of TPVs are discussed to comprehensively understand the status of current TPV *** we highlight recent progress in different types of TPVs,with a particular focus on solution-processed thin-film photovoltaics(PVs),including colloidal quantum dot PVs,metal halide perovskite PVs and organic *** applications of TPVs are also reviewed,with emphasis on agrivoltaics,smart windows and ***,current challenges and future opportunities in TPV research are pointed out.

关键词： Transparent semiconductors Solution-processable transparent solar cell Emerging solar cell materials Buildingintegrated photovoltaics

ICA-Net: improving class activation for weakly supervised semantic segmentation via joint contrastive and simulation learning

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2025年第3期 188-192页

作者： YE Zhuang liu Ruyu SUN bo School of Information Engineering Chengdu Aviation Vocational and Technical College School of Computer Science and Engineering Hangzhou Normal University Quanzhou Institute of Equipment Manufacturing Haixi Institutes Chinese Academy of Sciences

In the field of optoelectronics, certain types of data may be difficult to accurately annotate, such as high-resolution optoelectronic imaging or imaging in certain special spectral ranges. Weakly supervised learning can provide a more reliable approach in these situations. Current popular approaches mainly adopt the classification-based class activation maps (CAM) as initial pseudo labels to solve the task.

关键词：

AAV2-PDE6B restores retinal structure and function in the retinal degeneration 10 mouse model of retinitis pigmentosa by promoting phototransduction and inhibiting apoptosis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第8期20卷 2408-2419页

作者： Ruiqi Qiu Mingzhu Yang Xiuxiu Jin Jingyang liu Weiping Wang Xiaoli Zhang Jinfeng Han bo Lei Henan Eye Hospital Henan Provincial People’s HospitalPeople’s Hospital of Zhengzhou UniversityZhengzhouHenan ProvinceChina Eye Institute Henan Academy of Innovations in Medical ScienceZhengzhouHenan ProvinceChina Branch of National Clinical Research Center for Ocular Disease Henan Provincial People’s HospitalZhengzhouHenan ProvinceChina Academy of Medical Science Zhengzhou UniversityZhengzhouHenan ProvinceChina

Retinitis pigmentosa is a group of inherited diseases that lead to retinal degeneration and photoreceptor cell ***,there is no effective treatment for retinitis pigmentosa caused by PDE6B ***-associated virus(AAV)-mediated gene therapy is a promising strategy for treating retinitis *** aim of this study was to explore the molecular mechanisms by which AAV2-PDE6B rescues retinal *** do this,we injected retinal degeneration 10(rd10)mice subretinally with AAV2-PDE6B and assessed the therapeutic effects on retinal function and structure using dark-and light-adapted electroretinogram,optical coherence tomography,and ***-independent acquisition-mass spectrometry-based proteomic analysis was conducted to investigate protein expression levels and pathway enrichment,and the results from this analysis were verified by real-time polymerase chain reaction and western ***2-PDE6B injection significantly upregulated PDE6βexpression,preserved electroretinogram responses,and preserved outer nuclear layer thickness in rd10 *** expressed proteins between wild-type and rd10 mice were closely related to visual perception,and treating rd10 mice with AAV2-PDE6B restored differentially expressed protein expression to levels similar to those seen in wild-type *** Encyclopedia of Genes and Genome analysis showed that the differentially expressed proteins whose expression was most significantly altered by AAV2-PDE6B injection were enriched in phototransduction ***,the phototransductionrelated proteins Pde6α,Rom1,Rho,Aldh1a1,and Rbp1 exhibited opposite expression patterns in rd10 mice with or without AAV2-PDE6B ***,Bax/Bcl-2,p-ERK/ERK,and p-c-Fos/c-Fos expression levels decreased in rd10 mice following AAV2-PDE6B *** data suggest that AAV2-PDE6B-mediated gene therapy promotes phototransduction and inhibits apoptosis by inhibiting the ERK signaling pathway and upr

关键词： apoptosis AAV2-PDE6B ERK1/2 gene therapy phototransduction proteomics rd10 retinitis pigmentosa

Double [5]carbohelicene: facile synthesis, chiroptical properties,isomerization study, and lasing application

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期 233-240页

作者： Peipei liu Yantong Li Meng-Xiang Wu Hao Kang Xiao-Li Zhao Lin Xu Linlin liu Xiaodong Li Junfeng Fang Zhiwei Fang Ya Cheng Hai-bo Yang Huakang Yu Xueliang Shi State Key Laboratory of Petroleum Molecular & Process Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesSchool of Chemistry and Molecular Engineering East China Normal University School of Physics and Optoelectronics South China University of Technology Institute of Polymer Optoelectronic Materials & Devices State Key Laboratory of Luminescent Materials & Devices South China University of Technology School of Physics and Electronic Science Engineering Research Center of Nanophotonics & Advanced Instrument Ministry of EducationEast China Normal University State Key Laboratory of Precision Spectroscopy School of Physics and Electronic Science East China Normal University

Double carbohelicenes have attracted considerable attention due to their aesthetic structures, distinct π-conjugation extension, inherent chirality, and intriguing optical and electronic properties. Herein, the concise de novo synthesis of a new double[5]carbohelicene 1 together with its chiroptical properties, isomerization process and lasing application is presented. 1 was synthesized by a simple protocol involving the formation of a 6,6′-bipentacene as the key intermediate. It is worth noting that1 existed as two diastereomers 1-PP/MM and 1-PM, which were successfully isolated and unambiguously confirmed by Xray crystallography. The optical resolution of the racemic 1-PP/MM was successfully achieved by chiral-phase highperformance liquid chromatography（HPLC）, and 1-PP and 1-MM were characterized by circular dichroism. Interestingly, it was found that 1-PP/MM could be completely isomerized to 1-PM upon heating, and the detailed thermodynamics and kinetics of the isomerization process were systematically investigated. 1-PM exhibited deep-red luminescence with emission maximum at 723 nm and fluorescence quantum yield as high as 32.95%. Consequently, we can showcase the lasing application of 1-PM by doping with epoxy resin to assemble a bottle microlaser spontaneously, which the lasing wavelength is 796.6 nm at a threshold of 0.8 m J cm-2. We believe that our studies, including the facile synthesis methodology, detailed isomerization studies, and lasing application, will shed some light on the design and synthesis of novel carbohelical systems with more functions.

关键词：

同方期刊数据库